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Diffstat (limited to 'arch/arm/mach-omap2/omap_hwmod.c')
| -rw-r--r-- | arch/arm/mach-omap2/omap_hwmod.c | 3907 |
1 files changed, 3907 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c new file mode 100644 index 000000000..752969ff9 --- /dev/null +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -0,0 +1,3907 @@ +/* + * omap_hwmod implementation for OMAP2/3/4 + * + * Copyright (C) 2009-2011 Nokia Corporation + * Copyright (C) 2011-2012 Texas Instruments, Inc. + * + * Paul Walmsley, Benoît Cousson, Kevin Hilman + * + * Created in collaboration with (alphabetical order): Thara Gopinath, + * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand + * Sawant, Santosh Shilimkar, Richard Woodruff + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Introduction + * ------------ + * One way to view an OMAP SoC is as a collection of largely unrelated + * IP blocks connected by interconnects. The IP blocks include + * devices such as ARM processors, audio serial interfaces, UARTs, + * etc. Some of these devices, like the DSP, are created by TI; + * others, like the SGX, largely originate from external vendors. In + * TI's documentation, on-chip devices are referred to as "OMAP + * modules." Some of these IP blocks are identical across several + * OMAP versions. Others are revised frequently. + * + * These OMAP modules are tied together by various interconnects. + * Most of the address and data flow between modules is via OCP-based + * interconnects such as the L3 and L4 buses; but there are other + * interconnects that distribute the hardware clock tree, handle idle + * and reset signaling, supply power, and connect the modules to + * various pads or balls on the OMAP package. + * + * OMAP hwmod provides a consistent way to describe the on-chip + * hardware blocks and their integration into the rest of the chip. + * This description can be automatically generated from the TI + * hardware database. OMAP hwmod provides a standard, consistent API + * to reset, enable, idle, and disable these hardware blocks. And + * hwmod provides a way for other core code, such as the Linux device + * code or the OMAP power management and address space mapping code, + * to query the hardware database. + * + * Using hwmod + * ----------- + * Drivers won't call hwmod functions directly. That is done by the + * omap_device code, and in rare occasions, by custom integration code + * in arch/arm/ *omap*. The omap_device code includes functions to + * build a struct platform_device using omap_hwmod data, and that is + * currently how hwmod data is communicated to drivers and to the + * Linux driver model. Most drivers will call omap_hwmod functions only + * indirectly, via pm_runtime*() functions. + * + * From a layering perspective, here is where the OMAP hwmod code + * fits into the kernel software stack: + * + * +-------------------------------+ + * | Device driver code | + * | (e.g., drivers/) | + * +-------------------------------+ + * | Linux driver model | + * | (platform_device / | + * | platform_driver data/code) | + * +-------------------------------+ + * | OMAP core-driver integration | + * |(arch/arm/mach-omap2/devices.c)| + * +-------------------------------+ + * | omap_device code | + * | (../plat-omap/omap_device.c) | + * +-------------------------------+ + * ----> | omap_hwmod code/data | <----- + * | (../mach-omap2/omap_hwmod*) | + * +-------------------------------+ + * | OMAP clock/PRCM/register fns | + * | ({read,write}l_relaxed, clk*) | + * +-------------------------------+ + * + * Device drivers should not contain any OMAP-specific code or data in + * them. They should only contain code to operate the IP block that + * the driver is responsible for. This is because these IP blocks can + * also appear in other SoCs, either from TI (such as DaVinci) or from + * other manufacturers; and drivers should be reusable across other + * platforms. + * + * The OMAP hwmod code also will attempt to reset and idle all on-chip + * devices upon boot. The goal here is for the kernel to be + * completely self-reliant and independent from bootloaders. This is + * to ensure a repeatable configuration, both to ensure consistent + * runtime behavior, and to make it easier for others to reproduce + * bugs. + * + * OMAP module activity states + * --------------------------- + * The hwmod code considers modules to be in one of several activity + * states. IP blocks start out in an UNKNOWN state, then once they + * are registered via the hwmod code, proceed to the REGISTERED state. + * Once their clock names are resolved to clock pointers, the module + * enters the CLKS_INITED state; and finally, once the module has been + * reset and the integration registers programmed, the INITIALIZED state + * is entered. The hwmod code will then place the module into either + * the IDLE state to save power, or in the case of a critical system + * module, the ENABLED state. + * + * OMAP core integration code can then call omap_hwmod*() functions + * directly to move the module between the IDLE, ENABLED, and DISABLED + * states, as needed. This is done during both the PM idle loop, and + * in the OMAP core integration code's implementation of the PM runtime + * functions. + * + * References + * ---------- + * This is a partial list. + * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064) + * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090) + * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108) + * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140) + * - Open Core Protocol Specification 2.2 + * + * To do: + * - handle IO mapping + * - bus throughput & module latency measurement code + * + * XXX add tests at the beginning of each function to ensure the hwmod is + * in the appropriate state + * XXX error return values should be checked to ensure that they are + * appropriate + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/bootmem.h> +#include <linux/cpu.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <asm/system_misc.h> + +#include "clock.h" +#include "omap_hwmod.h" + +#include "soc.h" +#include "common.h" +#include "clockdomain.h" +#include "powerdomain.h" +#include "cm2xxx.h" +#include "cm3xxx.h" +#include "cm33xx.h" +#include "prm.h" +#include "prm3xxx.h" +#include "prm44xx.h" +#include "prm33xx.h" +#include "prminst44xx.h" +#include "mux.h" +#include "pm.h" + +/* Name of the OMAP hwmod for the MPU */ +#define MPU_INITIATOR_NAME "mpu" + +/* + * Number of struct omap_hwmod_link records per struct + * omap_hwmod_ocp_if record (master->slave and slave->master) + */ +#define LINKS_PER_OCP_IF 2 + +/* + * Address offset (in bytes) between the reset control and the reset + * status registers: 4 bytes on OMAP4 + */ +#define OMAP4_RST_CTRL_ST_OFFSET 4 + +/** + * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations + * @enable_module: function to enable a module (via MODULEMODE) + * @disable_module: function to disable a module (via MODULEMODE) + * + * XXX Eventually this functionality will be hidden inside the PRM/CM + * device drivers. Until then, this should avoid huge blocks of cpu_is_*() + * conditionals in this code. + */ +struct omap_hwmod_soc_ops { + void (*enable_module)(struct omap_hwmod *oh); + int (*disable_module)(struct omap_hwmod *oh); + int (*wait_target_ready)(struct omap_hwmod *oh); + int (*assert_hardreset)(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri); + int (*deassert_hardreset)(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri); + int (*is_hardreset_asserted)(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri); + int (*init_clkdm)(struct omap_hwmod *oh); + void (*update_context_lost)(struct omap_hwmod *oh); + int (*get_context_lost)(struct omap_hwmod *oh); +}; + +/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */ +static struct omap_hwmod_soc_ops soc_ops; + +/* omap_hwmod_list contains all registered struct omap_hwmods */ +static LIST_HEAD(omap_hwmod_list); + +/* mpu_oh: used to add/remove MPU initiator from sleepdep list */ +static struct omap_hwmod *mpu_oh; + +/* io_chain_lock: used to serialize reconfigurations of the I/O chain */ +static DEFINE_SPINLOCK(io_chain_lock); + +/* + * linkspace: ptr to a buffer that struct omap_hwmod_link records are + * allocated from - used to reduce the number of small memory + * allocations, which has a significant impact on performance + */ +static struct omap_hwmod_link *linkspace; + +/* + * free_ls, max_ls: array indexes into linkspace; representing the + * next free struct omap_hwmod_link index, and the maximum number of + * struct omap_hwmod_link records allocated (respectively) + */ +static unsigned short free_ls, max_ls, ls_supp; + +/* inited: set to true once the hwmod code is initialized */ +static bool inited; + +/* Private functions */ + +/** + * _fetch_next_ocp_if - return the next OCP interface in a list + * @p: ptr to a ptr to the list_head inside the ocp_if to return + * @i: pointer to the index of the element pointed to by @p in the list + * + * Return a pointer to the struct omap_hwmod_ocp_if record + * containing the struct list_head pointed to by @p, and increment + * @p such that a future call to this routine will return the next + * record. + */ +static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p, + int *i) +{ + struct omap_hwmod_ocp_if *oi; + + oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if; + *p = (*p)->next; + + *i = *i + 1; + + return oi; +} + +/** + * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy + * @oh: struct omap_hwmod * + * + * Load the current value of the hwmod OCP_SYSCONFIG register into the + * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no + * OCP_SYSCONFIG register or 0 upon success. + */ +static int _update_sysc_cache(struct omap_hwmod *oh) +{ + if (!oh->class->sysc) { + WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); + return -EINVAL; + } + + /* XXX ensure module interface clock is up */ + + oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs); + + if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE)) + oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED; + + return 0; +} + +/** + * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register + * @v: OCP_SYSCONFIG value to write + * @oh: struct omap_hwmod * + * + * Write @v into the module class' OCP_SYSCONFIG register, if it has + * one. No return value. + */ +static void _write_sysconfig(u32 v, struct omap_hwmod *oh) +{ + if (!oh->class->sysc) { + WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); + return; + } + + /* XXX ensure module interface clock is up */ + + /* Module might have lost context, always update cache and register */ + oh->_sysc_cache = v; + omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs); +} + +/** + * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v + * @oh: struct omap_hwmod * + * @standbymode: MIDLEMODE field bits + * @v: pointer to register contents to modify + * + * Update the master standby mode bits in @v to be @standbymode for + * the @oh hwmod. Does not write to the hardware. Returns -EINVAL + * upon error or 0 upon success. + */ +static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode, + u32 *v) +{ + u32 mstandby_mask; + u8 mstandby_shift; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + mstandby_shift = oh->class->sysc->sysc_fields->midle_shift; + mstandby_mask = (0x3 << mstandby_shift); + + *v &= ~mstandby_mask; + *v |= __ffs(standbymode) << mstandby_shift; + + return 0; +} + +/** + * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v + * @oh: struct omap_hwmod * + * @idlemode: SIDLEMODE field bits + * @v: pointer to register contents to modify + * + * Update the slave idle mode bits in @v to be @idlemode for the @oh + * hwmod. Does not write to the hardware. Returns -EINVAL upon error + * or 0 upon success. + */ +static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v) +{ + u32 sidle_mask; + u8 sidle_shift; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + sidle_shift = oh->class->sysc->sysc_fields->sidle_shift; + sidle_mask = (0x3 << sidle_shift); + + *v &= ~sidle_mask; + *v |= __ffs(idlemode) << sidle_shift; + + return 0; +} + +/** + * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v + * @oh: struct omap_hwmod * + * @clockact: CLOCKACTIVITY field bits + * @v: pointer to register contents to modify + * + * Update the clockactivity mode bits in @v to be @clockact for the + * @oh hwmod. Used for additional powersaving on some modules. Does + * not write to the hardware. Returns -EINVAL upon error or 0 upon + * success. + */ +static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v) +{ + u32 clkact_mask; + u8 clkact_shift; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + clkact_shift = oh->class->sysc->sysc_fields->clkact_shift; + clkact_mask = (0x3 << clkact_shift); + + *v &= ~clkact_mask; + *v |= clockact << clkact_shift; + + return 0; +} + +/** + * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v + * @oh: struct omap_hwmod * + * @v: pointer to register contents to modify + * + * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon + * error or 0 upon success. + */ +static int _set_softreset(struct omap_hwmod *oh, u32 *v) +{ + u32 softrst_mask; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); + + *v |= softrst_mask; + + return 0; +} + +/** + * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v + * @oh: struct omap_hwmod * + * @v: pointer to register contents to modify + * + * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon + * error or 0 upon success. + */ +static int _clear_softreset(struct omap_hwmod *oh, u32 *v) +{ + u32 softrst_mask; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, + "omap_hwmod: %s: sysc_fields absent for sysconfig class\n", + oh->name); + return -EINVAL; + } + + softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); + + *v &= ~softrst_mask; + + return 0; +} + +/** + * _wait_softreset_complete - wait for an OCP softreset to complete + * @oh: struct omap_hwmod * to wait on + * + * Wait until the IP block represented by @oh reports that its OCP + * softreset is complete. This can be triggered by software (see + * _ocp_softreset()) or by hardware upon returning from off-mode (one + * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT + * microseconds. Returns the number of microseconds waited. + */ +static int _wait_softreset_complete(struct omap_hwmod *oh) +{ + struct omap_hwmod_class_sysconfig *sysc; + u32 softrst_mask; + int c = 0; + + sysc = oh->class->sysc; + + if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS) + omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs) + & SYSS_RESETDONE_MASK), + MAX_MODULE_SOFTRESET_WAIT, c); + else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) { + softrst_mask = (0x1 << sysc->sysc_fields->srst_shift); + omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs) + & softrst_mask), + MAX_MODULE_SOFTRESET_WAIT, c); + } + + return c; +} + +/** + * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v + * @oh: struct omap_hwmod * + * + * The DMADISABLE bit is a semi-automatic bit present in sysconfig register + * of some modules. When the DMA must perform read/write accesses, the + * DMADISABLE bit is cleared by the hardware. But when the DMA must stop + * for power management, software must set the DMADISABLE bit back to 1. + * + * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon + * error or 0 upon success. + */ +static int _set_dmadisable(struct omap_hwmod *oh) +{ + u32 v; + u32 dmadisable_mask; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + /* clocks must be on for this operation */ + if (oh->_state != _HWMOD_STATE_ENABLED) { + pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name); + return -EINVAL; + } + + pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name); + + v = oh->_sysc_cache; + dmadisable_mask = + (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift); + v |= dmadisable_mask; + _write_sysconfig(v, oh); + + return 0; +} + +/** + * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v + * @oh: struct omap_hwmod * + * @autoidle: desired AUTOIDLE bitfield value (0 or 1) + * @v: pointer to register contents to modify + * + * Update the module autoidle bit in @v to be @autoidle for the @oh + * hwmod. The autoidle bit controls whether the module can gate + * internal clocks automatically when it isn't doing anything; the + * exact function of this bit varies on a per-module basis. This + * function does not write to the hardware. Returns -EINVAL upon + * error or 0 upon success. + */ +static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle, + u32 *v) +{ + u32 autoidle_mask; + u8 autoidle_shift; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE)) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift; + autoidle_mask = (0x1 << autoidle_shift); + + *v &= ~autoidle_mask; + *v |= autoidle << autoidle_shift; + + return 0; +} + +/** + * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux + * @oh: struct omap_hwmod * + * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable + * + * Set or clear the I/O pad wakeup flag in the mux entries for the + * hwmod @oh. This function changes the @oh->mux->pads_dynamic array + * in memory. If the hwmod is currently idled, and the new idle + * values don't match the previous ones, this function will also + * update the SCM PADCTRL registers. Otherwise, if the hwmod is not + * currently idled, this function won't touch the hardware: the new + * mux settings are written to the SCM PADCTRL registers when the + * hwmod is idled. No return value. + */ +static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake) +{ + struct omap_device_pad *pad; + bool change = false; + u16 prev_idle; + int j; + + if (!oh->mux || !oh->mux->enabled) + return; + + for (j = 0; j < oh->mux->nr_pads_dynamic; j++) { + pad = oh->mux->pads_dynamic[j]; + + if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP)) + continue; + + prev_idle = pad->idle; + + if (set_wake) + pad->idle |= OMAP_WAKEUP_EN; + else + pad->idle &= ~OMAP_WAKEUP_EN; + + if (prev_idle != pad->idle) + change = true; + } + + if (change && oh->_state == _HWMOD_STATE_IDLE) + omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); +} + +/** + * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware + * @oh: struct omap_hwmod * + * + * Allow the hardware module @oh to send wakeups. Returns -EINVAL + * upon error or 0 upon success. + */ +static int _enable_wakeup(struct omap_hwmod *oh, u32 *v) +{ + if (!oh->class->sysc || + !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || + (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || + (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) + *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift; + + if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) + _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); + if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) + _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); + + /* XXX test pwrdm_get_wken for this hwmod's subsystem */ + + return 0; +} + +/** + * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware + * @oh: struct omap_hwmod * + * + * Prevent the hardware module @oh to send wakeups. Returns -EINVAL + * upon error or 0 upon success. + */ +static int _disable_wakeup(struct omap_hwmod *oh, u32 *v) +{ + if (!oh->class->sysc || + !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || + (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || + (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) + return -EINVAL; + + if (!oh->class->sysc->sysc_fields) { + WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); + return -EINVAL; + } + + if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) + *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift); + + if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) + _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v); + if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) + _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v); + + /* XXX test pwrdm_get_wken for this hwmod's subsystem */ + + return 0; +} + +static struct clockdomain *_get_clkdm(struct omap_hwmod *oh) +{ + struct clk_hw_omap *clk; + + if (oh->clkdm) { + return oh->clkdm; + } else if (oh->_clk) { + if (__clk_get_flags(oh->_clk) & CLK_IS_BASIC) + return NULL; + clk = to_clk_hw_omap(__clk_get_hw(oh->_clk)); + return clk->clkdm; + } + return NULL; +} + +/** + * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active + * @oh: struct omap_hwmod * + * + * Prevent the hardware module @oh from entering idle while the + * hardare module initiator @init_oh is active. Useful when a module + * will be accessed by a particular initiator (e.g., if a module will + * be accessed by the IVA, there should be a sleepdep between the IVA + * initiator and the module). Only applies to modules in smart-idle + * mode. If the clockdomain is marked as not needing autodeps, return + * 0 without doing anything. Otherwise, returns -EINVAL upon error or + * passes along clkdm_add_sleepdep() value upon success. + */ +static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) +{ + struct clockdomain *clkdm, *init_clkdm; + + clkdm = _get_clkdm(oh); + init_clkdm = _get_clkdm(init_oh); + + if (!clkdm || !init_clkdm) + return -EINVAL; + + if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS) + return 0; + + return clkdm_add_sleepdep(clkdm, init_clkdm); +} + +/** + * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active + * @oh: struct omap_hwmod * + * + * Allow the hardware module @oh to enter idle while the hardare + * module initiator @init_oh is active. Useful when a module will not + * be accessed by a particular initiator (e.g., if a module will not + * be accessed by the IVA, there should be no sleepdep between the IVA + * initiator and the module). Only applies to modules in smart-idle + * mode. If the clockdomain is marked as not needing autodeps, return + * 0 without doing anything. Returns -EINVAL upon error or passes + * along clkdm_del_sleepdep() value upon success. + */ +static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) +{ + struct clockdomain *clkdm, *init_clkdm; + + clkdm = _get_clkdm(oh); + init_clkdm = _get_clkdm(init_oh); + + if (!clkdm || !init_clkdm) + return -EINVAL; + + if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS) + return 0; + + return clkdm_del_sleepdep(clkdm, init_clkdm); +} + +/** + * _init_main_clk - get a struct clk * for the the hwmod's main functional clk + * @oh: struct omap_hwmod * + * + * Called from _init_clocks(). Populates the @oh _clk (main + * functional clock pointer) if a main_clk is present. Returns 0 on + * success or -EINVAL on error. + */ +static int _init_main_clk(struct omap_hwmod *oh) +{ + int ret = 0; + + if (!oh->main_clk) + return 0; + + oh->_clk = clk_get(NULL, oh->main_clk); + if (IS_ERR(oh->_clk)) { + pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n", + oh->name, oh->main_clk); + return -EINVAL; + } + /* + * HACK: This needs a re-visit once clk_prepare() is implemented + * to do something meaningful. Today its just a no-op. + * If clk_prepare() is used at some point to do things like + * voltage scaling etc, then this would have to be moved to + * some point where subsystems like i2c and pmic become + * available. + */ + clk_prepare(oh->_clk); + + if (!_get_clkdm(oh)) + pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n", + oh->name, oh->main_clk); + + return ret; +} + +/** + * _init_interface_clks - get a struct clk * for the the hwmod's interface clks + * @oh: struct omap_hwmod * + * + * Called from _init_clocks(). Populates the @oh OCP slave interface + * clock pointers. Returns 0 on success or -EINVAL on error. + */ +static int _init_interface_clks(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os; + struct list_head *p; + struct clk *c; + int i = 0; + int ret = 0; + + p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + if (!os->clk) + continue; + + c = clk_get(NULL, os->clk); + if (IS_ERR(c)) { + pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n", + oh->name, os->clk); + ret = -EINVAL; + continue; + } + os->_clk = c; + /* + * HACK: This needs a re-visit once clk_prepare() is implemented + * to do something meaningful. Today its just a no-op. + * If clk_prepare() is used at some point to do things like + * voltage scaling etc, then this would have to be moved to + * some point where subsystems like i2c and pmic become + * available. + */ + clk_prepare(os->_clk); + } + + return ret; +} + +/** + * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks + * @oh: struct omap_hwmod * + * + * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk + * clock pointers. Returns 0 on success or -EINVAL on error. + */ +static int _init_opt_clks(struct omap_hwmod *oh) +{ + struct omap_hwmod_opt_clk *oc; + struct clk *c; + int i; + int ret = 0; + + for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) { + c = clk_get(NULL, oc->clk); + if (IS_ERR(c)) { + pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n", + oh->name, oc->clk); + ret = -EINVAL; + continue; + } + oc->_clk = c; + /* + * HACK: This needs a re-visit once clk_prepare() is implemented + * to do something meaningful. Today its just a no-op. + * If clk_prepare() is used at some point to do things like + * voltage scaling etc, then this would have to be moved to + * some point where subsystems like i2c and pmic become + * available. + */ + clk_prepare(oc->_clk); + } + + return ret; +} + +/** + * _enable_clocks - enable hwmod main clock and interface clocks + * @oh: struct omap_hwmod * + * + * Enables all clocks necessary for register reads and writes to succeed + * on the hwmod @oh. Returns 0. + */ +static int _enable_clocks(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os; + struct list_head *p; + int i = 0; + + pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name); + + if (oh->_clk) + clk_enable(oh->_clk); + + p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + + if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) + clk_enable(os->_clk); + } + + /* The opt clocks are controlled by the device driver. */ + + return 0; +} + +/** + * _disable_clocks - disable hwmod main clock and interface clocks + * @oh: struct omap_hwmod * + * + * Disables the hwmod @oh main functional and interface clocks. Returns 0. + */ +static int _disable_clocks(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os; + struct list_head *p; + int i = 0; + + pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name); + + if (oh->_clk) + clk_disable(oh->_clk); + + p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + + if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) + clk_disable(os->_clk); + } + + /* The opt clocks are controlled by the device driver. */ + + return 0; +} + +static void _enable_optional_clocks(struct omap_hwmod *oh) +{ + struct omap_hwmod_opt_clk *oc; + int i; + + pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name); + + for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) + if (oc->_clk) { + pr_debug("omap_hwmod: enable %s:%s\n", oc->role, + __clk_get_name(oc->_clk)); + clk_enable(oc->_clk); + } +} + +static void _disable_optional_clocks(struct omap_hwmod *oh) +{ + struct omap_hwmod_opt_clk *oc; + int i; + + pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name); + + for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) + if (oc->_clk) { + pr_debug("omap_hwmod: disable %s:%s\n", oc->role, + __clk_get_name(oc->_clk)); + clk_disable(oc->_clk); + } +} + +/** + * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4 + * @oh: struct omap_hwmod * + * + * Enables the PRCM module mode related to the hwmod @oh. + * No return value. + */ +static void _omap4_enable_module(struct omap_hwmod *oh) +{ + if (!oh->clkdm || !oh->prcm.omap4.modulemode) + return; + + pr_debug("omap_hwmod: %s: %s: %d\n", + oh->name, __func__, oh->prcm.omap4.modulemode); + + omap_cm_module_enable(oh->prcm.omap4.modulemode, + oh->clkdm->prcm_partition, + oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs); +} + +/** + * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4 + * @oh: struct omap_hwmod * + * + * Wait for a module @oh to enter slave idle. Returns 0 if the module + * does not have an IDLEST bit or if the module successfully enters + * slave idle; otherwise, pass along the return value of the + * appropriate *_cm*_wait_module_idle() function. + */ +static int _omap4_wait_target_disable(struct omap_hwmod *oh) +{ + if (!oh) + return -EINVAL; + + if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm) + return 0; + + if (oh->flags & HWMOD_NO_IDLEST) + return 0; + + return omap_cm_wait_module_idle(oh->clkdm->prcm_partition, + oh->clkdm->cm_inst, + oh->prcm.omap4.clkctrl_offs, 0); +} + +/** + * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh + * @oh: struct omap_hwmod *oh + * + * Count and return the number of MPU IRQs associated with the hwmod + * @oh. Used to allocate struct resource data. Returns 0 if @oh is + * NULL. + */ +static int _count_mpu_irqs(struct omap_hwmod *oh) +{ + struct omap_hwmod_irq_info *ohii; + int i = 0; + + if (!oh || !oh->mpu_irqs) + return 0; + + do { + ohii = &oh->mpu_irqs[i++]; + } while (ohii->irq != -1); + + return i-1; +} + +/** + * _count_sdma_reqs - count the number of SDMA request lines associated with @oh + * @oh: struct omap_hwmod *oh + * + * Count and return the number of SDMA request lines associated with + * the hwmod @oh. Used to allocate struct resource data. Returns 0 + * if @oh is NULL. + */ +static int _count_sdma_reqs(struct omap_hwmod *oh) +{ + struct omap_hwmod_dma_info *ohdi; + int i = 0; + + if (!oh || !oh->sdma_reqs) + return 0; + + do { + ohdi = &oh->sdma_reqs[i++]; + } while (ohdi->dma_req != -1); + + return i-1; +} + +/** + * _count_ocp_if_addr_spaces - count the number of address space entries for @oh + * @oh: struct omap_hwmod *oh + * + * Count and return the number of address space ranges associated with + * the hwmod @oh. Used to allocate struct resource data. Returns 0 + * if @oh is NULL. + */ +static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os) +{ + struct omap_hwmod_addr_space *mem; + int i = 0; + + if (!os || !os->addr) + return 0; + + do { + mem = &os->addr[i++]; + } while (mem->pa_start != mem->pa_end); + + return i-1; +} + +/** + * _get_mpu_irq_by_name - fetch MPU interrupt line number by name + * @oh: struct omap_hwmod * to operate on + * @name: pointer to the name of the MPU interrupt number to fetch (optional) + * @irq: pointer to an unsigned int to store the MPU IRQ number to + * + * Retrieve a MPU hardware IRQ line number named by @name associated + * with the IP block pointed to by @oh. The IRQ number will be filled + * into the address pointed to by @dma. When @name is non-null, the + * IRQ line number associated with the named entry will be returned. + * If @name is null, the first matching entry will be returned. Data + * order is not meaningful in hwmod data, so callers are strongly + * encouraged to use a non-null @name whenever possible to avoid + * unpredictable effects if hwmod data is later added that causes data + * ordering to change. Returns 0 upon success or a negative error + * code upon error. + */ +static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name, + unsigned int *irq) +{ + int i; + bool found = false; + + if (!oh->mpu_irqs) + return -ENOENT; + + i = 0; + while (oh->mpu_irqs[i].irq != -1) { + if (name == oh->mpu_irqs[i].name || + !strcmp(name, oh->mpu_irqs[i].name)) { + found = true; + break; + } + i++; + } + + if (!found) + return -ENOENT; + + *irq = oh->mpu_irqs[i].irq; + + return 0; +} + +/** + * _get_sdma_req_by_name - fetch SDMA request line ID by name + * @oh: struct omap_hwmod * to operate on + * @name: pointer to the name of the SDMA request line to fetch (optional) + * @dma: pointer to an unsigned int to store the request line ID to + * + * Retrieve an SDMA request line ID named by @name on the IP block + * pointed to by @oh. The ID will be filled into the address pointed + * to by @dma. When @name is non-null, the request line ID associated + * with the named entry will be returned. If @name is null, the first + * matching entry will be returned. Data order is not meaningful in + * hwmod data, so callers are strongly encouraged to use a non-null + * @name whenever possible to avoid unpredictable effects if hwmod + * data is later added that causes data ordering to change. Returns 0 + * upon success or a negative error code upon error. + */ +static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name, + unsigned int *dma) +{ + int i; + bool found = false; + + if (!oh->sdma_reqs) + return -ENOENT; + + i = 0; + while (oh->sdma_reqs[i].dma_req != -1) { + if (name == oh->sdma_reqs[i].name || + !strcmp(name, oh->sdma_reqs[i].name)) { + found = true; + break; + } + i++; + } + + if (!found) + return -ENOENT; + + *dma = oh->sdma_reqs[i].dma_req; + + return 0; +} + +/** + * _get_addr_space_by_name - fetch address space start & end by name + * @oh: struct omap_hwmod * to operate on + * @name: pointer to the name of the address space to fetch (optional) + * @pa_start: pointer to a u32 to store the starting address to + * @pa_end: pointer to a u32 to store the ending address to + * + * Retrieve address space start and end addresses for the IP block + * pointed to by @oh. The data will be filled into the addresses + * pointed to by @pa_start and @pa_end. When @name is non-null, the + * address space data associated with the named entry will be + * returned. If @name is null, the first matching entry will be + * returned. Data order is not meaningful in hwmod data, so callers + * are strongly encouraged to use a non-null @name whenever possible + * to avoid unpredictable effects if hwmod data is later added that + * causes data ordering to change. Returns 0 upon success or a + * negative error code upon error. + */ +static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name, + u32 *pa_start, u32 *pa_end) +{ + int i, j; + struct omap_hwmod_ocp_if *os; + struct list_head *p = NULL; + bool found = false; + + p = oh->slave_ports.next; + + i = 0; + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + + if (!os->addr) + return -ENOENT; + + j = 0; + while (os->addr[j].pa_start != os->addr[j].pa_end) { + if (name == os->addr[j].name || + !strcmp(name, os->addr[j].name)) { + found = true; + break; + } + j++; + } + + if (found) + break; + } + + if (!found) + return -ENOENT; + + *pa_start = os->addr[j].pa_start; + *pa_end = os->addr[j].pa_end; + + return 0; +} + +/** + * _save_mpu_port_index - find and save the index to @oh's MPU port + * @oh: struct omap_hwmod * + * + * Determines the array index of the OCP slave port that the MPU uses + * to address the device, and saves it into the struct omap_hwmod. + * Intended to be called during hwmod registration only. No return + * value. + */ +static void __init _save_mpu_port_index(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os = NULL; + struct list_head *p; + int i = 0; + + if (!oh) + return; + + oh->_int_flags |= _HWMOD_NO_MPU_PORT; + + p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + if (os->user & OCP_USER_MPU) { + oh->_mpu_port = os; + oh->_int_flags &= ~_HWMOD_NO_MPU_PORT; + break; + } + } + + return; +} + +/** + * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU + * @oh: struct omap_hwmod * + * + * Given a pointer to a struct omap_hwmod record @oh, return a pointer + * to the struct omap_hwmod_ocp_if record that is used by the MPU to + * communicate with the IP block. This interface need not be directly + * connected to the MPU (and almost certainly is not), but is directly + * connected to the IP block represented by @oh. Returns a pointer + * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon + * error or if there does not appear to be a path from the MPU to this + * IP block. + */ +static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh) +{ + if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0) + return NULL; + + return oh->_mpu_port; +}; + +/** + * _find_mpu_rt_addr_space - return MPU register target address space for @oh + * @oh: struct omap_hwmod * + * + * Returns a pointer to the struct omap_hwmod_addr_space record representing + * the register target MPU address space; or returns NULL upon error. + */ +static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os; + struct omap_hwmod_addr_space *mem; + int found = 0, i = 0; + + os = _find_mpu_rt_port(oh); + if (!os || !os->addr) + return NULL; + + do { + mem = &os->addr[i++]; + if (mem->flags & ADDR_TYPE_RT) + found = 1; + } while (!found && mem->pa_start != mem->pa_end); + + return (found) ? mem : NULL; +} + +/** + * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG + * @oh: struct omap_hwmod * + * + * Ensure that the OCP_SYSCONFIG register for the IP block represented + * by @oh is set to indicate to the PRCM that the IP block is active. + * Usually this means placing the module into smart-idle mode and + * smart-standby, but if there is a bug in the automatic idle handling + * for the IP block, it may need to be placed into the force-idle or + * no-idle variants of these modes. No return value. + */ +static void _enable_sysc(struct omap_hwmod *oh) +{ + u8 idlemode, sf; + u32 v; + bool clkdm_act; + struct clockdomain *clkdm; + + if (!oh->class->sysc) + return; + + /* + * Wait until reset has completed, this is needed as the IP + * block is reset automatically by hardware in some cases + * (off-mode for example), and the drivers require the + * IP to be ready when they access it + */ + if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) + _enable_optional_clocks(oh); + _wait_softreset_complete(oh); + if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) + _disable_optional_clocks(oh); + + v = oh->_sysc_cache; + sf = oh->class->sysc->sysc_flags; + + clkdm = _get_clkdm(oh); + if (sf & SYSC_HAS_SIDLEMODE) { + if (oh->flags & HWMOD_SWSUP_SIDLE || + oh->flags & HWMOD_SWSUP_SIDLE_ACT) { + idlemode = HWMOD_IDLEMODE_NO; + } else { + if (sf & SYSC_HAS_ENAWAKEUP) + _enable_wakeup(oh, &v); + if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) + idlemode = HWMOD_IDLEMODE_SMART_WKUP; + else + idlemode = HWMOD_IDLEMODE_SMART; + } + + /* + * This is special handling for some IPs like + * 32k sync timer. Force them to idle! + */ + clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU); + if (clkdm_act && !(oh->class->sysc->idlemodes & + (SIDLE_SMART | SIDLE_SMART_WKUP))) + idlemode = HWMOD_IDLEMODE_FORCE; + + _set_slave_idlemode(oh, idlemode, &v); + } + + if (sf & SYSC_HAS_MIDLEMODE) { + if (oh->flags & HWMOD_FORCE_MSTANDBY) { + idlemode = HWMOD_IDLEMODE_FORCE; + } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) { + idlemode = HWMOD_IDLEMODE_NO; + } else { + if (sf & SYSC_HAS_ENAWAKEUP) + _enable_wakeup(oh, &v); + if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) + idlemode = HWMOD_IDLEMODE_SMART_WKUP; + else + idlemode = HWMOD_IDLEMODE_SMART; + } + _set_master_standbymode(oh, idlemode, &v); + } + + /* + * XXX The clock framework should handle this, by + * calling into this code. But this must wait until the + * clock structures are tagged with omap_hwmod entries + */ + if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) && + (sf & SYSC_HAS_CLOCKACTIVITY)) + _set_clockactivity(oh, oh->class->sysc->clockact, &v); + + /* If the cached value is the same as the new value, skip the write */ + if (oh->_sysc_cache != v) + _write_sysconfig(v, oh); + + /* + * Set the autoidle bit only after setting the smartidle bit + * Setting this will not have any impact on the other modules. + */ + if (sf & SYSC_HAS_AUTOIDLE) { + idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ? + 0 : 1; + _set_module_autoidle(oh, idlemode, &v); + _write_sysconfig(v, oh); + } +} + +/** + * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG + * @oh: struct omap_hwmod * + * + * If module is marked as SWSUP_SIDLE, force the module into slave + * idle; otherwise, configure it for smart-idle. If module is marked + * as SWSUP_MSUSPEND, force the module into master standby; otherwise, + * configure it for smart-standby. No return value. + */ +static void _idle_sysc(struct omap_hwmod *oh) +{ + u8 idlemode, sf; + u32 v; + + if (!oh->class->sysc) + return; + + v = oh->_sysc_cache; + sf = oh->class->sysc->sysc_flags; + + if (sf & SYSC_HAS_SIDLEMODE) { + if (oh->flags & HWMOD_SWSUP_SIDLE) { + idlemode = HWMOD_IDLEMODE_FORCE; + } else { + if (sf & SYSC_HAS_ENAWAKEUP) + _enable_wakeup(oh, &v); + if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) + idlemode = HWMOD_IDLEMODE_SMART_WKUP; + else + idlemode = HWMOD_IDLEMODE_SMART; + } + _set_slave_idlemode(oh, idlemode, &v); + } + + if (sf & SYSC_HAS_MIDLEMODE) { + if ((oh->flags & HWMOD_SWSUP_MSTANDBY) || + (oh->flags & HWMOD_FORCE_MSTANDBY)) { + idlemode = HWMOD_IDLEMODE_FORCE; + } else { + if (sf & SYSC_HAS_ENAWAKEUP) + _enable_wakeup(oh, &v); + if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) + idlemode = HWMOD_IDLEMODE_SMART_WKUP; + else + idlemode = HWMOD_IDLEMODE_SMART; + } + _set_master_standbymode(oh, idlemode, &v); + } + + _write_sysconfig(v, oh); +} + +/** + * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG + * @oh: struct omap_hwmod * + * + * Force the module into slave idle and master suspend. No return + * value. + */ +static void _shutdown_sysc(struct omap_hwmod *oh) +{ + u32 v; + u8 sf; + + if (!oh->class->sysc) + return; + + v = oh->_sysc_cache; + sf = oh->class->sysc->sysc_flags; + + if (sf & SYSC_HAS_SIDLEMODE) + _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v); + + if (sf & SYSC_HAS_MIDLEMODE) + _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v); + + if (sf & SYSC_HAS_AUTOIDLE) + _set_module_autoidle(oh, 1, &v); + + _write_sysconfig(v, oh); +} + +/** + * _lookup - find an omap_hwmod by name + * @name: find an omap_hwmod by name + * + * Return a pointer to an omap_hwmod by name, or NULL if not found. + */ +static struct omap_hwmod *_lookup(const char *name) +{ + struct omap_hwmod *oh, *temp_oh; + + oh = NULL; + + list_for_each_entry(temp_oh, &omap_hwmod_list, node) { + if (!strcmp(name, temp_oh->name)) { + oh = temp_oh; + break; + } + } + + return oh; +} + +/** + * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod + * @oh: struct omap_hwmod * + * + * Convert a clockdomain name stored in a struct omap_hwmod into a + * clockdomain pointer, and save it into the struct omap_hwmod. + * Return -EINVAL if the clkdm_name lookup failed. + */ +static int _init_clkdm(struct omap_hwmod *oh) +{ + if (!oh->clkdm_name) { + pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name); + return 0; + } + + oh->clkdm = clkdm_lookup(oh->clkdm_name); + if (!oh->clkdm) { + pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n", + oh->name, oh->clkdm_name); + return 0; + } + + pr_debug("omap_hwmod: %s: associated to clkdm %s\n", + oh->name, oh->clkdm_name); + + return 0; +} + +/** + * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as + * well the clockdomain. + * @oh: struct omap_hwmod * + * @data: not used; pass NULL + * + * Called by omap_hwmod_setup_*() (after omap2_clk_init()). + * Resolves all clock names embedded in the hwmod. Returns 0 on + * success, or a negative error code on failure. + */ +static int _init_clocks(struct omap_hwmod *oh, void *data) +{ + int ret = 0; + + if (oh->_state != _HWMOD_STATE_REGISTERED) + return 0; + + pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name); + + if (soc_ops.init_clkdm) + ret |= soc_ops.init_clkdm(oh); + + ret |= _init_main_clk(oh); + ret |= _init_interface_clks(oh); + ret |= _init_opt_clks(oh); + + if (!ret) + oh->_state = _HWMOD_STATE_CLKS_INITED; + else + pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name); + + return ret; +} + +/** + * _lookup_hardreset - fill register bit info for this hwmod/reset line + * @oh: struct omap_hwmod * + * @name: name of the reset line in the context of this hwmod + * @ohri: struct omap_hwmod_rst_info * that this function will fill in + * + * Return the bit position of the reset line that match the + * input name. Return -ENOENT if not found. + */ +static int _lookup_hardreset(struct omap_hwmod *oh, const char *name, + struct omap_hwmod_rst_info *ohri) +{ + int i; + + for (i = 0; i < oh->rst_lines_cnt; i++) { + const char *rst_line = oh->rst_lines[i].name; + if (!strcmp(rst_line, name)) { + ohri->rst_shift = oh->rst_lines[i].rst_shift; + ohri->st_shift = oh->rst_lines[i].st_shift; + pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n", + oh->name, __func__, rst_line, ohri->rst_shift, + ohri->st_shift); + + return 0; + } + } + + return -ENOENT; +} + +/** + * _assert_hardreset - assert the HW reset line of submodules + * contained in the hwmod module. + * @oh: struct omap_hwmod * + * @name: name of the reset line to lookup and assert + * + * Some IP like dsp, ipu or iva contain processor that require an HW + * reset line to be assert / deassert in order to enable fully the IP. + * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of + * asserting the hardreset line on the currently-booted SoC, or passes + * along the return value from _lookup_hardreset() or the SoC's + * assert_hardreset code. + */ +static int _assert_hardreset(struct omap_hwmod *oh, const char *name) +{ + struct omap_hwmod_rst_info ohri; + int ret = -EINVAL; + + if (!oh) + return -EINVAL; + + if (!soc_ops.assert_hardreset) + return -ENOSYS; + + ret = _lookup_hardreset(oh, name, &ohri); + if (ret < 0) + return ret; + + ret = soc_ops.assert_hardreset(oh, &ohri); + + return ret; +} + +/** + * _deassert_hardreset - deassert the HW reset line of submodules contained + * in the hwmod module. + * @oh: struct omap_hwmod * + * @name: name of the reset line to look up and deassert + * + * Some IP like dsp, ipu or iva contain processor that require an HW + * reset line to be assert / deassert in order to enable fully the IP. + * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of + * deasserting the hardreset line on the currently-booted SoC, or passes + * along the return value from _lookup_hardreset() or the SoC's + * deassert_hardreset code. + */ +static int _deassert_hardreset(struct omap_hwmod *oh, const char *name) +{ + struct omap_hwmod_rst_info ohri; + int ret = -EINVAL; + int hwsup = 0; + + if (!oh) + return -EINVAL; + + if (!soc_ops.deassert_hardreset) + return -ENOSYS; + + ret = _lookup_hardreset(oh, name, &ohri); + if (ret < 0) + return ret; + + if (oh->clkdm) { + /* + * A clockdomain must be in SW_SUP otherwise reset + * might not be completed. The clockdomain can be set + * in HW_AUTO only when the module become ready. + */ + hwsup = clkdm_in_hwsup(oh->clkdm); + ret = clkdm_hwmod_enable(oh->clkdm, oh); + if (ret) { + WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n", + oh->name, oh->clkdm->name, ret); + return ret; + } + } + + _enable_clocks(oh); + if (soc_ops.enable_module) + soc_ops.enable_module(oh); + + ret = soc_ops.deassert_hardreset(oh, &ohri); + + if (soc_ops.disable_module) + soc_ops.disable_module(oh); + _disable_clocks(oh); + + if (ret == -EBUSY) + pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name); + + if (oh->clkdm) { + /* + * Set the clockdomain to HW_AUTO, assuming that the + * previous state was HW_AUTO. + */ + if (hwsup) + clkdm_allow_idle(oh->clkdm); + + clkdm_hwmod_disable(oh->clkdm, oh); + } + + return ret; +} + +/** + * _read_hardreset - read the HW reset line state of submodules + * contained in the hwmod module + * @oh: struct omap_hwmod * + * @name: name of the reset line to look up and read + * + * Return the state of the reset line. Returns -EINVAL if @oh is + * null, -ENOSYS if we have no way of reading the hardreset line + * status on the currently-booted SoC, or passes along the return + * value from _lookup_hardreset() or the SoC's is_hardreset_asserted + * code. + */ +static int _read_hardreset(struct omap_hwmod *oh, const char *name) +{ + struct omap_hwmod_rst_info ohri; + int ret = -EINVAL; + + if (!oh) + return -EINVAL; + + if (!soc_ops.is_hardreset_asserted) + return -ENOSYS; + + ret = _lookup_hardreset(oh, name, &ohri); + if (ret < 0) + return ret; + + return soc_ops.is_hardreset_asserted(oh, &ohri); +} + +/** + * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset + * @oh: struct omap_hwmod * + * + * If all hardreset lines associated with @oh are asserted, then return true. + * Otherwise, if part of @oh is out hardreset or if no hardreset lines + * associated with @oh are asserted, then return false. + * This function is used to avoid executing some parts of the IP block + * enable/disable sequence if its hardreset line is set. + */ +static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh) +{ + int i, rst_cnt = 0; + + if (oh->rst_lines_cnt == 0) + return false; + + for (i = 0; i < oh->rst_lines_cnt; i++) + if (_read_hardreset(oh, oh->rst_lines[i].name) > 0) + rst_cnt++; + + if (oh->rst_lines_cnt == rst_cnt) + return true; + + return false; +} + +/** + * _are_any_hardreset_lines_asserted - return true if any part of @oh is + * hard-reset + * @oh: struct omap_hwmod * + * + * If any hardreset lines associated with @oh are asserted, then + * return true. Otherwise, if no hardreset lines associated with @oh + * are asserted, or if @oh has no hardreset lines, then return false. + * This function is used to avoid executing some parts of the IP block + * enable/disable sequence if any hardreset line is set. + */ +static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh) +{ + int rst_cnt = 0; + int i; + + for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++) + if (_read_hardreset(oh, oh->rst_lines[i].name) > 0) + rst_cnt++; + + return (rst_cnt) ? true : false; +} + +/** + * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4 + * @oh: struct omap_hwmod * + * + * Disable the PRCM module mode related to the hwmod @oh. + * Return EINVAL if the modulemode is not supported and 0 in case of success. + */ +static int _omap4_disable_module(struct omap_hwmod *oh) +{ + int v; + + if (!oh->clkdm || !oh->prcm.omap4.modulemode) + return -EINVAL; + + /* + * Since integration code might still be doing something, only + * disable if all lines are under hardreset. + */ + if (_are_any_hardreset_lines_asserted(oh)) + return 0; + + pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__); + + omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst, + oh->prcm.omap4.clkctrl_offs); + + v = _omap4_wait_target_disable(oh); + if (v) + pr_warn("omap_hwmod: %s: _wait_target_disable failed\n", + oh->name); + + return 0; +} + +/** + * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit + * @oh: struct omap_hwmod * + * + * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be + * enabled for this to work. Returns -ENOENT if the hwmod cannot be + * reset this way, -EINVAL if the hwmod is in the wrong state, + * -ETIMEDOUT if the module did not reset in time, or 0 upon success. + * + * In OMAP3 a specific SYSSTATUS register is used to get the reset status. + * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead + * use the SYSCONFIG softreset bit to provide the status. + * + * Note that some IP like McBSP do have reset control but don't have + * reset status. + */ +static int _ocp_softreset(struct omap_hwmod *oh) +{ + u32 v; + int c = 0; + int ret = 0; + + if (!oh->class->sysc || + !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) + return -ENOENT; + + /* clocks must be on for this operation */ + if (oh->_state != _HWMOD_STATE_ENABLED) { + pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n", + oh->name); + return -EINVAL; + } + + /* For some modules, all optionnal clocks need to be enabled as well */ + if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) + _enable_optional_clocks(oh); + + pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name); + + v = oh->_sysc_cache; + ret = _set_softreset(oh, &v); + if (ret) + goto dis_opt_clks; + + _write_sysconfig(v, oh); + + if (oh->class->sysc->srst_udelay) + udelay(oh->class->sysc->srst_udelay); + + c = _wait_softreset_complete(oh); + if (c == MAX_MODULE_SOFTRESET_WAIT) { + pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n", + oh->name, MAX_MODULE_SOFTRESET_WAIT); + ret = -ETIMEDOUT; + goto dis_opt_clks; + } else { + pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c); + } + + ret = _clear_softreset(oh, &v); + if (ret) + goto dis_opt_clks; + + _write_sysconfig(v, oh); + + /* + * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from + * _wait_target_ready() or _reset() + */ + +dis_opt_clks: + if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET) + _disable_optional_clocks(oh); + + return ret; +} + +/** + * _reset - reset an omap_hwmod + * @oh: struct omap_hwmod * + * + * Resets an omap_hwmod @oh. If the module has a custom reset + * function pointer defined, then call it to reset the IP block, and + * pass along its return value to the caller. Otherwise, if the IP + * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield + * associated with it, call a function to reset the IP block via that + * method, and pass along the return value to the caller. Finally, if + * the IP block has some hardreset lines associated with it, assert + * all of those, but do _not_ deassert them. (This is because driver + * authors have expressed an apparent requirement to control the + * deassertion of the hardreset lines themselves.) + * + * The default software reset mechanism for most OMAP IP blocks is + * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some + * hwmods cannot be reset via this method. Some are not targets and + * therefore have no OCP header registers to access. Others (like the + * IVA) have idiosyncratic reset sequences. So for these relatively + * rare cases, custom reset code can be supplied in the struct + * omap_hwmod_class .reset function pointer. + * + * _set_dmadisable() is called to set the DMADISABLE bit so that it + * does not prevent idling of the system. This is necessary for cases + * where ROMCODE/BOOTLOADER uses dma and transfers control to the + * kernel without disabling dma. + * + * Passes along the return value from either _ocp_softreset() or the + * custom reset function - these must return -EINVAL if the hwmod + * cannot be reset this way or if the hwmod is in the wrong state, + * -ETIMEDOUT if the module did not reset in time, or 0 upon success. + */ +static int _reset(struct omap_hwmod *oh) +{ + int i, r; + + pr_debug("omap_hwmod: %s: resetting\n", oh->name); + + if (oh->class->reset) { + r = oh->class->reset(oh); + } else { + if (oh->rst_lines_cnt > 0) { + for (i = 0; i < oh->rst_lines_cnt; i++) + _assert_hardreset(oh, oh->rst_lines[i].name); + return 0; + } else { + r = _ocp_softreset(oh); + if (r == -ENOENT) + r = 0; + } + } + + _set_dmadisable(oh); + + /* + * OCP_SYSCONFIG bits need to be reprogrammed after a + * softreset. The _enable() function should be split to avoid + * the rewrite of the OCP_SYSCONFIG register. + */ + if (oh->class->sysc) { + _update_sysc_cache(oh); + _enable_sysc(oh); + } + + return r; +} + +/** + * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain + * + * Call the appropriate PRM function to clear any logged I/O chain + * wakeups and to reconfigure the chain. This apparently needs to be + * done upon every mux change. Since hwmods can be concurrently + * enabled and idled, hold a spinlock around the I/O chain + * reconfiguration sequence. No return value. + * + * XXX When the PRM code is moved to drivers, this function can be removed, + * as the PRM infrastructure should abstract this. + */ +static void _reconfigure_io_chain(void) +{ + unsigned long flags; + + spin_lock_irqsave(&io_chain_lock, flags); + + omap_prm_reconfigure_io_chain(); + + spin_unlock_irqrestore(&io_chain_lock, flags); +} + +/** + * _omap4_update_context_lost - increment hwmod context loss counter if + * hwmod context was lost, and clear hardware context loss reg + * @oh: hwmod to check for context loss + * + * If the PRCM indicates that the hwmod @oh lost context, increment + * our in-memory context loss counter, and clear the RM_*_CONTEXT + * bits. No return value. + */ +static void _omap4_update_context_lost(struct omap_hwmod *oh) +{ + if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT) + return; + + if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.context_offs)) + return; + + oh->prcm.omap4.context_lost_counter++; + prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.context_offs); +} + +/** + * _omap4_get_context_lost - get context loss counter for a hwmod + * @oh: hwmod to get context loss counter for + * + * Returns the in-memory context loss counter for a hwmod. + */ +static int _omap4_get_context_lost(struct omap_hwmod *oh) +{ + return oh->prcm.omap4.context_lost_counter; +} + +/** + * _enable_preprogram - Pre-program an IP block during the _enable() process + * @oh: struct omap_hwmod * + * + * Some IP blocks (such as AESS) require some additional programming + * after enable before they can enter idle. If a function pointer to + * do so is present in the hwmod data, then call it and pass along the + * return value; otherwise, return 0. + */ +static int _enable_preprogram(struct omap_hwmod *oh) +{ + if (!oh->class->enable_preprogram) + return 0; + + return oh->class->enable_preprogram(oh); +} + +/** + * _enable - enable an omap_hwmod + * @oh: struct omap_hwmod * + * + * Enables an omap_hwmod @oh such that the MPU can access the hwmod's + * register target. Returns -EINVAL if the hwmod is in the wrong + * state or passes along the return value of _wait_target_ready(). + */ +static int _enable(struct omap_hwmod *oh) +{ + int r; + int hwsup = 0; + + pr_debug("omap_hwmod: %s: enabling\n", oh->name); + + /* + * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled + * state at init. Now that someone is really trying to enable + * them, just ensure that the hwmod mux is set. + */ + if (oh->_int_flags & _HWMOD_SKIP_ENABLE) { + /* + * If the caller has mux data populated, do the mux'ing + * which wouldn't have been done as part of the _enable() + * done during setup. + */ + if (oh->mux) + omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); + + oh->_int_flags &= ~_HWMOD_SKIP_ENABLE; + return 0; + } + + if (oh->_state != _HWMOD_STATE_INITIALIZED && + oh->_state != _HWMOD_STATE_IDLE && + oh->_state != _HWMOD_STATE_DISABLED) { + WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n", + oh->name); + return -EINVAL; + } + + /* + * If an IP block contains HW reset lines and all of them are + * asserted, we let integration code associated with that + * block handle the enable. We've received very little + * information on what those driver authors need, and until + * detailed information is provided and the driver code is + * posted to the public lists, this is probably the best we + * can do. + */ + if (_are_all_hardreset_lines_asserted(oh)) + return 0; + + /* Mux pins for device runtime if populated */ + if (oh->mux && (!oh->mux->enabled || + ((oh->_state == _HWMOD_STATE_IDLE) && + oh->mux->pads_dynamic))) { + omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); + _reconfigure_io_chain(); + } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) { + _reconfigure_io_chain(); + } + + _add_initiator_dep(oh, mpu_oh); + + if (oh->clkdm) { + /* + * A clockdomain must be in SW_SUP before enabling + * completely the module. The clockdomain can be set + * in HW_AUTO only when the module become ready. + */ + hwsup = clkdm_in_hwsup(oh->clkdm) && + !clkdm_missing_idle_reporting(oh->clkdm); + r = clkdm_hwmod_enable(oh->clkdm, oh); + if (r) { + WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n", + oh->name, oh->clkdm->name, r); + return r; + } + } + + _enable_clocks(oh); + if (soc_ops.enable_module) + soc_ops.enable_module(oh); + if (oh->flags & HWMOD_BLOCK_WFI) + cpu_idle_poll_ctrl(true); + + if (soc_ops.update_context_lost) + soc_ops.update_context_lost(oh); + + r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) : + -EINVAL; + if (!r) { + /* + * Set the clockdomain to HW_AUTO only if the target is ready, + * assuming that the previous state was HW_AUTO + */ + if (oh->clkdm && hwsup) + clkdm_allow_idle(oh->clkdm); + + oh->_state = _HWMOD_STATE_ENABLED; + + /* Access the sysconfig only if the target is ready */ + if (oh->class->sysc) { + if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED)) + _update_sysc_cache(oh); + _enable_sysc(oh); + } + r = _enable_preprogram(oh); + } else { + if (soc_ops.disable_module) + soc_ops.disable_module(oh); + _disable_clocks(oh); + pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n", + oh->name, r); + + if (oh->clkdm) + clkdm_hwmod_disable(oh->clkdm, oh); + } + + return r; +} + +/** + * _idle - idle an omap_hwmod + * @oh: struct omap_hwmod * + * + * Idles an omap_hwmod @oh. This should be called once the hwmod has + * no further work. Returns -EINVAL if the hwmod is in the wrong + * state or returns 0. + */ +static int _idle(struct omap_hwmod *oh) +{ + pr_debug("omap_hwmod: %s: idling\n", oh->name); + + if (oh->_state != _HWMOD_STATE_ENABLED) { + WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n", + oh->name); + return -EINVAL; + } + + if (_are_all_hardreset_lines_asserted(oh)) + return 0; + + if (oh->class->sysc) + _idle_sysc(oh); + _del_initiator_dep(oh, mpu_oh); + + if (oh->flags & HWMOD_BLOCK_WFI) + cpu_idle_poll_ctrl(false); + if (soc_ops.disable_module) + soc_ops.disable_module(oh); + + /* + * The module must be in idle mode before disabling any parents + * clocks. Otherwise, the parent clock might be disabled before + * the module transition is done, and thus will prevent the + * transition to complete properly. + */ + _disable_clocks(oh); + if (oh->clkdm) + clkdm_hwmod_disable(oh->clkdm, oh); + + /* Mux pins for device idle if populated */ + if (oh->mux && oh->mux->pads_dynamic) { + omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); + _reconfigure_io_chain(); + } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) { + _reconfigure_io_chain(); + } + + oh->_state = _HWMOD_STATE_IDLE; + + return 0; +} + +/** + * _shutdown - shutdown an omap_hwmod + * @oh: struct omap_hwmod * + * + * Shut down an omap_hwmod @oh. This should be called when the driver + * used for the hwmod is removed or unloaded or if the driver is not + * used by the system. Returns -EINVAL if the hwmod is in the wrong + * state or returns 0. + */ +static int _shutdown(struct omap_hwmod *oh) +{ + int ret, i; + u8 prev_state; + + if (oh->_state != _HWMOD_STATE_IDLE && + oh->_state != _HWMOD_STATE_ENABLED) { + WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n", + oh->name); + return -EINVAL; + } + + if (_are_all_hardreset_lines_asserted(oh)) + return 0; + + pr_debug("omap_hwmod: %s: disabling\n", oh->name); + + if (oh->class->pre_shutdown) { + prev_state = oh->_state; + if (oh->_state == _HWMOD_STATE_IDLE) + _enable(oh); + ret = oh->class->pre_shutdown(oh); + if (ret) { + if (prev_state == _HWMOD_STATE_IDLE) + _idle(oh); + return ret; + } + } + + if (oh->class->sysc) { + if (oh->_state == _HWMOD_STATE_IDLE) + _enable(oh); + _shutdown_sysc(oh); + } + + /* clocks and deps are already disabled in idle */ + if (oh->_state == _HWMOD_STATE_ENABLED) { + _del_initiator_dep(oh, mpu_oh); + /* XXX what about the other system initiators here? dma, dsp */ + if (oh->flags & HWMOD_BLOCK_WFI) + cpu_idle_poll_ctrl(false); + if (soc_ops.disable_module) + soc_ops.disable_module(oh); + _disable_clocks(oh); + if (oh->clkdm) + clkdm_hwmod_disable(oh->clkdm, oh); + } + /* XXX Should this code also force-disable the optional clocks? */ + + for (i = 0; i < oh->rst_lines_cnt; i++) + _assert_hardreset(oh, oh->rst_lines[i].name); + + /* Mux pins to safe mode or use populated off mode values */ + if (oh->mux) + omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED); + + oh->_state = _HWMOD_STATE_DISABLED; + + return 0; +} + +static int of_dev_find_hwmod(struct device_node *np, + struct omap_hwmod *oh) +{ + int count, i, res; + const char *p; + + count = of_property_count_strings(np, "ti,hwmods"); + if (count < 1) + return -ENODEV; + + for (i = 0; i < count; i++) { + res = of_property_read_string_index(np, "ti,hwmods", + i, &p); + if (res) + continue; + if (!strcmp(p, oh->name)) { + pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n", + np->name, i, oh->name); + return i; + } + } + + return -ENODEV; +} + +/** + * of_dev_hwmod_lookup - look up needed hwmod from dt blob + * @np: struct device_node * + * @oh: struct omap_hwmod * + * @index: index of the entry found + * @found: struct device_node * found or NULL + * + * Parse the dt blob and find out needed hwmod. Recursive function is + * implemented to take care hierarchical dt blob parsing. + * Return: Returns 0 on success, -ENODEV when not found. + */ +static int of_dev_hwmod_lookup(struct device_node *np, + struct omap_hwmod *oh, + int *index, + struct device_node **found) +{ + struct device_node *np0 = NULL; + int res; + + res = of_dev_find_hwmod(np, oh); + if (res >= 0) { + *found = np; + *index = res; + return 0; + } + + for_each_child_of_node(np, np0) { + struct device_node *fc; + int i; + + res = of_dev_hwmod_lookup(np0, oh, &i, &fc); + if (res == 0) { + *found = fc; + *index = i; + return 0; + } + } + + *found = NULL; + *index = 0; + + return -ENODEV; +} + +/** + * _init_mpu_rt_base - populate the virtual address for a hwmod + * @oh: struct omap_hwmod * to locate the virtual address + * @data: (unused, caller should pass NULL) + * @index: index of the reg entry iospace in device tree + * @np: struct device_node * of the IP block's device node in the DT data + * + * Cache the virtual address used by the MPU to access this IP block's + * registers. This address is needed early so the OCP registers that + * are part of the device's address space can be ioremapped properly. + * + * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and + * -ENXIO on absent or invalid register target address space. + */ +static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data, + int index, struct device_node *np) +{ + struct omap_hwmod_addr_space *mem; + void __iomem *va_start = NULL; + + if (!oh) + return -EINVAL; + + _save_mpu_port_index(oh); + + if (oh->_int_flags & _HWMOD_NO_MPU_PORT) + return -ENXIO; + + mem = _find_mpu_rt_addr_space(oh); + if (!mem) { + pr_debug("omap_hwmod: %s: no MPU register target found\n", + oh->name); + + /* Extract the IO space from device tree blob */ + if (!np) + return -ENXIO; + + va_start = of_iomap(np, index + oh->mpu_rt_idx); + } else { + va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start); + } + + if (!va_start) { + if (mem) + pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name); + else + pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n", + oh->name, index, np->full_name); + return -ENXIO; + } + + pr_debug("omap_hwmod: %s: MPU register target at va %p\n", + oh->name, va_start); + + oh->_mpu_rt_va = va_start; + return 0; +} + +/** + * _init - initialize internal data for the hwmod @oh + * @oh: struct omap_hwmod * + * @n: (unused) + * + * Look up the clocks and the address space used by the MPU to access + * registers belonging to the hwmod @oh. @oh must already be + * registered at this point. This is the first of two phases for + * hwmod initialization. Code called here does not touch any hardware + * registers, it simply prepares internal data structures. Returns 0 + * upon success or if the hwmod isn't registered or if the hwmod's + * address space is not defined, or -EINVAL upon failure. + */ +static int __init _init(struct omap_hwmod *oh, void *data) +{ + int r, index; + struct device_node *np = NULL; + + if (oh->_state != _HWMOD_STATE_REGISTERED) + return 0; + + if (of_have_populated_dt()) { + struct device_node *bus; + + bus = of_find_node_by_name(NULL, "ocp"); + if (!bus) + return -ENODEV; + + r = of_dev_hwmod_lookup(bus, oh, &index, &np); + if (r) + pr_debug("omap_hwmod: %s missing dt data\n", oh->name); + else if (np && index) + pr_warn("omap_hwmod: %s using broken dt data from %s\n", + oh->name, np->name); + } + + if (oh->class->sysc) { + r = _init_mpu_rt_base(oh, NULL, index, np); + if (r < 0) { + WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n", + oh->name); + return 0; + } + } + + r = _init_clocks(oh, NULL); + if (r < 0) { + WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name); + return -EINVAL; + } + + if (np) { + if (of_find_property(np, "ti,no-reset-on-init", NULL)) + oh->flags |= HWMOD_INIT_NO_RESET; + if (of_find_property(np, "ti,no-idle-on-init", NULL)) + oh->flags |= HWMOD_INIT_NO_IDLE; + } + + oh->_state = _HWMOD_STATE_INITIALIZED; + + return 0; +} + +/** + * _setup_iclk_autoidle - configure an IP block's interface clocks + * @oh: struct omap_hwmod * + * + * Set up the module's interface clocks. XXX This function is still mostly + * a stub; implementing this properly requires iclk autoidle usecounting in + * the clock code. No return value. + */ +static void __init _setup_iclk_autoidle(struct omap_hwmod *oh) +{ + struct omap_hwmod_ocp_if *os; + struct list_head *p; + int i = 0; + if (oh->_state != _HWMOD_STATE_INITIALIZED) + return; + + p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + if (!os->_clk) + continue; + + if (os->flags & OCPIF_SWSUP_IDLE) { + /* XXX omap_iclk_deny_idle(c); */ + } else { + /* XXX omap_iclk_allow_idle(c); */ + clk_enable(os->_clk); + } + } + + return; +} + +/** + * _setup_reset - reset an IP block during the setup process + * @oh: struct omap_hwmod * + * + * Reset the IP block corresponding to the hwmod @oh during the setup + * process. The IP block is first enabled so it can be successfully + * reset. Returns 0 upon success or a negative error code upon + * failure. + */ +static int __init _setup_reset(struct omap_hwmod *oh) +{ + int r; + + if (oh->_state != _HWMOD_STATE_INITIALIZED) + return -EINVAL; + + if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK) + return -EPERM; + + if (oh->rst_lines_cnt == 0) { + r = _enable(oh); + if (r) { + pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n", + oh->name, oh->_state); + return -EINVAL; + } + } + + if (!(oh->flags & HWMOD_INIT_NO_RESET)) + r = _reset(oh); + + return r; +} + +/** + * _setup_postsetup - transition to the appropriate state after _setup + * @oh: struct omap_hwmod * + * + * Place an IP block represented by @oh into a "post-setup" state -- + * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that + * this function is called at the end of _setup().) The postsetup + * state for an IP block can be changed by calling + * omap_hwmod_enter_postsetup_state() early in the boot process, + * before one of the omap_hwmod_setup*() functions are called for the + * IP block. + * + * The IP block stays in this state until a PM runtime-based driver is + * loaded for that IP block. A post-setup state of IDLE is + * appropriate for almost all IP blocks with runtime PM-enabled + * drivers, since those drivers are able to enable the IP block. A + * post-setup state of ENABLED is appropriate for kernels with PM + * runtime disabled. The DISABLED state is appropriate for unusual IP + * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers + * included, since the WDTIMER starts running on reset and will reset + * the MPU if left active. + * + * This post-setup mechanism is deprecated. Once all of the OMAP + * drivers have been converted to use PM runtime, and all of the IP + * block data and interconnect data is available to the hwmod code, it + * should be possible to replace this mechanism with a "lazy reset" + * arrangement. In a "lazy reset" setup, each IP block is enabled + * when the driver first probes, then all remaining IP blocks without + * drivers are either shut down or enabled after the drivers have + * loaded. However, this cannot take place until the above + * preconditions have been met, since otherwise the late reset code + * has no way of knowing which IP blocks are in use by drivers, and + * which ones are unused. + * + * No return value. + */ +static void __init _setup_postsetup(struct omap_hwmod *oh) +{ + u8 postsetup_state; + + if (oh->rst_lines_cnt > 0) + return; + + postsetup_state = oh->_postsetup_state; + if (postsetup_state == _HWMOD_STATE_UNKNOWN) + postsetup_state = _HWMOD_STATE_ENABLED; + + /* + * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data - + * it should be set by the core code as a runtime flag during startup + */ + if ((oh->flags & HWMOD_INIT_NO_IDLE) && + (postsetup_state == _HWMOD_STATE_IDLE)) { + oh->_int_flags |= _HWMOD_SKIP_ENABLE; + postsetup_state = _HWMOD_STATE_ENABLED; + } + + if (postsetup_state == _HWMOD_STATE_IDLE) + _idle(oh); + else if (postsetup_state == _HWMOD_STATE_DISABLED) + _shutdown(oh); + else if (postsetup_state != _HWMOD_STATE_ENABLED) + WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n", + oh->name, postsetup_state); + + return; +} + +/** + * _setup - prepare IP block hardware for use + * @oh: struct omap_hwmod * + * @n: (unused, pass NULL) + * + * Configure the IP block represented by @oh. This may include + * enabling the IP block, resetting it, and placing it into a + * post-setup state, depending on the type of IP block and applicable + * flags. IP blocks are reset to prevent any previous configuration + * by the bootloader or previous operating system from interfering + * with power management or other parts of the system. The reset can + * be avoided; see omap_hwmod_no_setup_reset(). This is the second of + * two phases for hwmod initialization. Code called here generally + * affects the IP block hardware, or system integration hardware + * associated with the IP block. Returns 0. + */ +static int __init _setup(struct omap_hwmod *oh, void *data) +{ + if (oh->_state != _HWMOD_STATE_INITIALIZED) + return 0; + + if (oh->parent_hwmod) { + int r; + + r = _enable(oh->parent_hwmod); + WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n", + oh->name, oh->parent_hwmod->name); + } + + _setup_iclk_autoidle(oh); + + if (!_setup_reset(oh)) + _setup_postsetup(oh); + + if (oh->parent_hwmod) { + u8 postsetup_state; + + postsetup_state = oh->parent_hwmod->_postsetup_state; + + if (postsetup_state == _HWMOD_STATE_IDLE) + _idle(oh->parent_hwmod); + else if (postsetup_state == _HWMOD_STATE_DISABLED) + _shutdown(oh->parent_hwmod); + else if (postsetup_state != _HWMOD_STATE_ENABLED) + WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n", + oh->parent_hwmod->name, postsetup_state); + } + + return 0; +} + +/** + * _register - register a struct omap_hwmod + * @oh: struct omap_hwmod * + * + * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod + * already has been registered by the same name; -EINVAL if the + * omap_hwmod is in the wrong state, if @oh is NULL, if the + * omap_hwmod's class field is NULL; if the omap_hwmod is missing a + * name, or if the omap_hwmod's class is missing a name; or 0 upon + * success. + * + * XXX The data should be copied into bootmem, so the original data + * should be marked __initdata and freed after init. This would allow + * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note + * that the copy process would be relatively complex due to the large number + * of substructures. + */ +static int __init _register(struct omap_hwmod *oh) +{ + if (!oh || !oh->name || !oh->class || !oh->class->name || + (oh->_state != _HWMOD_STATE_UNKNOWN)) + return -EINVAL; + + pr_debug("omap_hwmod: %s: registering\n", oh->name); + + if (_lookup(oh->name)) + return -EEXIST; + + list_add_tail(&oh->node, &omap_hwmod_list); + + INIT_LIST_HEAD(&oh->master_ports); + INIT_LIST_HEAD(&oh->slave_ports); + spin_lock_init(&oh->_lock); + lockdep_set_class(&oh->_lock, &oh->hwmod_key); + + oh->_state = _HWMOD_STATE_REGISTERED; + + /* + * XXX Rather than doing a strcmp(), this should test a flag + * set in the hwmod data, inserted by the autogenerator code. + */ + if (!strcmp(oh->name, MPU_INITIATOR_NAME)) + mpu_oh = oh; + + return 0; +} + +/** + * _alloc_links - return allocated memory for hwmod links + * @ml: pointer to a struct omap_hwmod_link * for the master link + * @sl: pointer to a struct omap_hwmod_link * for the slave link + * + * Return pointers to two struct omap_hwmod_link records, via the + * addresses pointed to by @ml and @sl. Will first attempt to return + * memory allocated as part of a large initial block, but if that has + * been exhausted, will allocate memory itself. Since ideally this + * second allocation path will never occur, the number of these + * 'supplemental' allocations will be logged when debugging is + * enabled. Returns 0. + */ +static int __init _alloc_links(struct omap_hwmod_link **ml, + struct omap_hwmod_link **sl) +{ + unsigned int sz; + + if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) { + *ml = &linkspace[free_ls++]; + *sl = &linkspace[free_ls++]; + return 0; + } + + sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF; + + *sl = NULL; + *ml = memblock_virt_alloc(sz, 0); + + *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link); + + ls_supp++; + pr_debug("omap_hwmod: supplemental link allocations needed: %d\n", + ls_supp * LINKS_PER_OCP_IF); + + return 0; +}; + +/** + * _add_link - add an interconnect between two IP blocks + * @oi: pointer to a struct omap_hwmod_ocp_if record + * + * Add struct omap_hwmod_link records connecting the master IP block + * specified in @oi->master to @oi, and connecting the slave IP block + * specified in @oi->slave to @oi. This code is assumed to run before + * preemption or SMP has been enabled, thus avoiding the need for + * locking in this code. Changes to this assumption will require + * additional locking. Returns 0. + */ +static int __init _add_link(struct omap_hwmod_ocp_if *oi) +{ + struct omap_hwmod_link *ml, *sl; + + pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name, + oi->slave->name); + + _alloc_links(&ml, &sl); + + ml->ocp_if = oi; + list_add(&ml->node, &oi->master->master_ports); + oi->master->masters_cnt++; + + sl->ocp_if = oi; + list_add(&sl->node, &oi->slave->slave_ports); + oi->slave->slaves_cnt++; + + return 0; +} + +/** + * _register_link - register a struct omap_hwmod_ocp_if + * @oi: struct omap_hwmod_ocp_if * + * + * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it + * has already been registered; -EINVAL if @oi is NULL or if the + * record pointed to by @oi is missing required fields; or 0 upon + * success. + * + * XXX The data should be copied into bootmem, so the original data + * should be marked __initdata and freed after init. This would allow + * unneeded omap_hwmods to be freed on multi-OMAP configurations. + */ +static int __init _register_link(struct omap_hwmod_ocp_if *oi) +{ + if (!oi || !oi->master || !oi->slave || !oi->user) + return -EINVAL; + + if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED) + return -EEXIST; + + pr_debug("omap_hwmod: registering link from %s to %s\n", + oi->master->name, oi->slave->name); + + /* + * Register the connected hwmods, if they haven't been + * registered already + */ + if (oi->master->_state != _HWMOD_STATE_REGISTERED) + _register(oi->master); + + if (oi->slave->_state != _HWMOD_STATE_REGISTERED) + _register(oi->slave); + + _add_link(oi); + + oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED; + + return 0; +} + +/** + * _alloc_linkspace - allocate large block of hwmod links + * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count + * + * Allocate a large block of struct omap_hwmod_link records. This + * improves boot time significantly by avoiding the need to allocate + * individual records one by one. If the number of records to + * allocate in the block hasn't been manually specified, this function + * will count the number of struct omap_hwmod_ocp_if records in @ois + * and use that to determine the allocation size. For SoC families + * that require multiple list registrations, such as OMAP3xxx, this + * estimation process isn't optimal, so manual estimation is advised + * in those cases. Returns -EEXIST if the allocation has already occurred + * or 0 upon success. + */ +static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois) +{ + unsigned int i = 0; + unsigned int sz; + + if (linkspace) { + WARN(1, "linkspace already allocated\n"); + return -EEXIST; + } + + if (max_ls == 0) + while (ois[i++]) + max_ls += LINKS_PER_OCP_IF; + + sz = sizeof(struct omap_hwmod_link) * max_ls; + + pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n", + __func__, sz, max_ls); + + linkspace = memblock_virt_alloc(sz, 0); + + return 0; +} + +/* Static functions intended only for use in soc_ops field function pointers */ + +/** + * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle + * @oh: struct omap_hwmod * + * + * Wait for a module @oh to leave slave idle. Returns 0 if the module + * does not have an IDLEST bit or if the module successfully leaves + * slave idle; otherwise, pass along the return value of the + * appropriate *_cm*_wait_module_ready() function. + */ +static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh) +{ + if (!oh) + return -EINVAL; + + if (oh->flags & HWMOD_NO_IDLEST) + return 0; + + if (!_find_mpu_rt_port(oh)) + return 0; + + /* XXX check module SIDLEMODE, hardreset status, enabled clocks */ + + return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs, + oh->prcm.omap2.idlest_reg_id, + oh->prcm.omap2.idlest_idle_bit); +} + +/** + * _omap4_wait_target_ready - wait for a module to leave slave idle + * @oh: struct omap_hwmod * + * + * Wait for a module @oh to leave slave idle. Returns 0 if the module + * does not have an IDLEST bit or if the module successfully leaves + * slave idle; otherwise, pass along the return value of the + * appropriate *_cm*_wait_module_ready() function. + */ +static int _omap4_wait_target_ready(struct omap_hwmod *oh) +{ + if (!oh) + return -EINVAL; + + if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm) + return 0; + + if (!_find_mpu_rt_port(oh)) + return 0; + + /* XXX check module SIDLEMODE, hardreset status */ + + return omap_cm_wait_module_ready(oh->clkdm->prcm_partition, + oh->clkdm->cm_inst, + oh->prcm.omap4.clkctrl_offs, 0); +} + +/** + * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to assert hardreset + * @ohri: hardreset line data + * + * Call omap2_prm_assert_hardreset() with parameters extracted from + * the hwmod @oh and the hardreset line data @ohri. Only intended for + * use as an soc_ops function pointer. Passes along the return value + * from omap2_prm_assert_hardreset(). XXX This function is scheduled + * for removal when the PRM code is moved into drivers/. + */ +static int _omap2_assert_hardreset(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + return omap_prm_assert_hardreset(ohri->rst_shift, 0, + oh->prcm.omap2.module_offs, 0); +} + +/** + * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to deassert hardreset + * @ohri: hardreset line data + * + * Call omap2_prm_deassert_hardreset() with parameters extracted from + * the hwmod @oh and the hardreset line data @ohri. Only intended for + * use as an soc_ops function pointer. Passes along the return value + * from omap2_prm_deassert_hardreset(). XXX This function is + * scheduled for removal when the PRM code is moved into drivers/. + */ +static int _omap2_deassert_hardreset(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0, + oh->prcm.omap2.module_offs, 0, 0); +} + +/** + * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to test hardreset + * @ohri: hardreset line data + * + * Call omap2_prm_is_hardreset_asserted() with parameters extracted + * from the hwmod @oh and the hardreset line data @ohri. Only + * intended for use as an soc_ops function pointer. Passes along the + * return value from omap2_prm_is_hardreset_asserted(). XXX This + * function is scheduled for removal when the PRM code is moved into + * drivers/. + */ +static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + return omap_prm_is_hardreset_asserted(ohri->st_shift, 0, + oh->prcm.omap2.module_offs, 0); +} + +/** + * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to assert hardreset + * @ohri: hardreset line data + * + * Call omap4_prminst_assert_hardreset() with parameters extracted + * from the hwmod @oh and the hardreset line data @ohri. Only + * intended for use as an soc_ops function pointer. Passes along the + * return value from omap4_prminst_assert_hardreset(). XXX This + * function is scheduled for removal when the PRM code is moved into + * drivers/. + */ +static int _omap4_assert_hardreset(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + if (!oh->clkdm) + return -EINVAL; + + return omap_prm_assert_hardreset(ohri->rst_shift, + oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.rstctrl_offs); +} + +/** + * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to deassert hardreset + * @ohri: hardreset line data + * + * Call omap4_prminst_deassert_hardreset() with parameters extracted + * from the hwmod @oh and the hardreset line data @ohri. Only + * intended for use as an soc_ops function pointer. Passes along the + * return value from omap4_prminst_deassert_hardreset(). XXX This + * function is scheduled for removal when the PRM code is moved into + * drivers/. + */ +static int _omap4_deassert_hardreset(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + if (!oh->clkdm) + return -EINVAL; + + if (ohri->st_shift) + pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n", + oh->name, ohri->name); + return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift, + oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.rstctrl_offs, + oh->prcm.omap4.rstctrl_offs + + OMAP4_RST_CTRL_ST_OFFSET); +} + +/** + * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to test hardreset + * @ohri: hardreset line data + * + * Call omap4_prminst_is_hardreset_asserted() with parameters + * extracted from the hwmod @oh and the hardreset line data @ohri. + * Only intended for use as an soc_ops function pointer. Passes along + * the return value from omap4_prminst_is_hardreset_asserted(). XXX + * This function is scheduled for removal when the PRM code is moved + * into drivers/. + */ +static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + if (!oh->clkdm) + return -EINVAL; + + return omap_prm_is_hardreset_asserted(ohri->rst_shift, + oh->clkdm->pwrdm.ptr-> + prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.rstctrl_offs); +} + +/** + * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args + * @oh: struct omap_hwmod * to deassert hardreset + * @ohri: hardreset line data + * + * Call am33xx_prminst_deassert_hardreset() with parameters extracted + * from the hwmod @oh and the hardreset line data @ohri. Only + * intended for use as an soc_ops function pointer. Passes along the + * return value from am33xx_prminst_deassert_hardreset(). XXX This + * function is scheduled for removal when the PRM code is moved into + * drivers/. + */ +static int _am33xx_deassert_hardreset(struct omap_hwmod *oh, + struct omap_hwmod_rst_info *ohri) +{ + return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, + oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.rstctrl_offs, + oh->prcm.omap4.rstst_offs); +} + +/* Public functions */ + +u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs) +{ + if (oh->flags & HWMOD_16BIT_REG) + return readw_relaxed(oh->_mpu_rt_va + reg_offs); + else + return readl_relaxed(oh->_mpu_rt_va + reg_offs); +} + +void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs) +{ + if (oh->flags & HWMOD_16BIT_REG) + writew_relaxed(v, oh->_mpu_rt_va + reg_offs); + else + writel_relaxed(v, oh->_mpu_rt_va + reg_offs); +} + +/** + * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit + * @oh: struct omap_hwmod * + * + * This is a public function exposed to drivers. Some drivers may need to do + * some settings before and after resetting the device. Those drivers after + * doing the necessary settings could use this function to start a reset by + * setting the SYSCONFIG.SOFTRESET bit. + */ +int omap_hwmod_softreset(struct omap_hwmod *oh) +{ + u32 v; + int ret; + + if (!oh || !(oh->_sysc_cache)) + return -EINVAL; + + v = oh->_sysc_cache; + ret = _set_softreset(oh, &v); + if (ret) + goto error; + _write_sysconfig(v, oh); + + ret = _clear_softreset(oh, &v); + if (ret) + goto error; + _write_sysconfig(v, oh); + +error: + return ret; +} + +/** + * omap_hwmod_lookup - look up a registered omap_hwmod by name + * @name: name of the omap_hwmod to look up + * + * Given a @name of an omap_hwmod, return a pointer to the registered + * struct omap_hwmod *, or NULL upon error. + */ +struct omap_hwmod *omap_hwmod_lookup(const char *name) +{ + struct omap_hwmod *oh; + + if (!name) + return NULL; + + oh = _lookup(name); + + return oh; +} + +/** + * omap_hwmod_for_each - call function for each registered omap_hwmod + * @fn: pointer to a callback function + * @data: void * data to pass to callback function + * + * Call @fn for each registered omap_hwmod, passing @data to each + * function. @fn must return 0 for success or any other value for + * failure. If @fn returns non-zero, the iteration across omap_hwmods + * will stop and the non-zero return value will be passed to the + * caller of omap_hwmod_for_each(). @fn is called with + * omap_hwmod_for_each() held. + */ +int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data), + void *data) +{ + struct omap_hwmod *temp_oh; + int ret = 0; + + if (!fn) + return -EINVAL; + + list_for_each_entry(temp_oh, &omap_hwmod_list, node) { + ret = (*fn)(temp_oh, data); + if (ret) + break; + } + + return ret; +} + +/** + * omap_hwmod_register_links - register an array of hwmod links + * @ois: pointer to an array of omap_hwmod_ocp_if to register + * + * Intended to be called early in boot before the clock framework is + * initialized. If @ois is not null, will register all omap_hwmods + * listed in @ois that are valid for this chip. Returns -EINVAL if + * omap_hwmod_init() hasn't been called before calling this function, + * -ENOMEM if the link memory area can't be allocated, or 0 upon + * success. + */ +int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois) +{ + int r, i; + + if (!inited) + return -EINVAL; + + if (!ois) + return 0; + + if (ois[0] == NULL) /* Empty list */ + return 0; + + if (!linkspace) { + if (_alloc_linkspace(ois)) { + pr_err("omap_hwmod: could not allocate link space\n"); + return -ENOMEM; + } + } + + i = 0; + do { + r = _register_link(ois[i]); + WARN(r && r != -EEXIST, + "omap_hwmod: _register_link(%s -> %s) returned %d\n", + ois[i]->master->name, ois[i]->slave->name, r); + } while (ois[++i]); + + return 0; +} + +/** + * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up + * @oh: pointer to the hwmod currently being set up (usually not the MPU) + * + * If the hwmod data corresponding to the MPU subsystem IP block + * hasn't been initialized and set up yet, do so now. This must be + * done first since sleep dependencies may be added from other hwmods + * to the MPU. Intended to be called only by omap_hwmod_setup*(). No + * return value. + */ +static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh) +{ + if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN) + pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n", + __func__, MPU_INITIATOR_NAME); + else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh) + omap_hwmod_setup_one(MPU_INITIATOR_NAME); +} + +/** + * omap_hwmod_setup_one - set up a single hwmod + * @oh_name: const char * name of the already-registered hwmod to set up + * + * Initialize and set up a single hwmod. Intended to be used for a + * small number of early devices, such as the timer IP blocks used for + * the scheduler clock. Must be called after omap2_clk_init(). + * Resolves the struct clk names to struct clk pointers for each + * registered omap_hwmod. Also calls _setup() on each hwmod. Returns + * -EINVAL upon error or 0 upon success. + */ +int __init omap_hwmod_setup_one(const char *oh_name) +{ + struct omap_hwmod *oh; + + pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__); + + oh = _lookup(oh_name); + if (!oh) { + WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name); + return -EINVAL; + } + + _ensure_mpu_hwmod_is_setup(oh); + + _init(oh, NULL); + _setup(oh, NULL); + + return 0; +} + +/** + * omap_hwmod_setup_all - set up all registered IP blocks + * + * Initialize and set up all IP blocks registered with the hwmod code. + * Must be called after omap2_clk_init(). Resolves the struct clk + * names to struct clk pointers for each registered omap_hwmod. Also + * calls _setup() on each hwmod. Returns 0 upon success. + */ +static int __init omap_hwmod_setup_all(void) +{ + _ensure_mpu_hwmod_is_setup(NULL); + + omap_hwmod_for_each(_init, NULL); + omap_hwmod_for_each(_setup, NULL); + + return 0; +} +omap_core_initcall(omap_hwmod_setup_all); + +/** + * omap_hwmod_enable - enable an omap_hwmod + * @oh: struct omap_hwmod * + * + * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable(). + * Returns -EINVAL on error or passes along the return value from _enable(). + */ +int omap_hwmod_enable(struct omap_hwmod *oh) +{ + int r; + unsigned long flags; + + if (!oh) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + r = _enable(oh); + spin_unlock_irqrestore(&oh->_lock, flags); + + return r; +} + +/** + * omap_hwmod_idle - idle an omap_hwmod + * @oh: struct omap_hwmod * + * + * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle(). + * Returns -EINVAL on error or passes along the return value from _idle(). + */ +int omap_hwmod_idle(struct omap_hwmod *oh) +{ + unsigned long flags; + + if (!oh) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + _idle(oh); + spin_unlock_irqrestore(&oh->_lock, flags); + + return 0; +} + +/** + * omap_hwmod_shutdown - shutdown an omap_hwmod + * @oh: struct omap_hwmod * + * + * Shutdown an omap_hwmod @oh. Intended to be called by + * omap_device_shutdown(). Returns -EINVAL on error or passes along + * the return value from _shutdown(). + */ +int omap_hwmod_shutdown(struct omap_hwmod *oh) +{ + unsigned long flags; + + if (!oh) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + _shutdown(oh); + spin_unlock_irqrestore(&oh->_lock, flags); + + return 0; +} + +/* + * IP block data retrieval functions + */ + +/** + * omap_hwmod_count_resources - count number of struct resources needed by hwmod + * @oh: struct omap_hwmod * + * @flags: Type of resources to include when counting (IRQ/DMA/MEM) + * + * Count the number of struct resource array elements necessary to + * contain omap_hwmod @oh resources. Intended to be called by code + * that registers omap_devices. Intended to be used to determine the + * size of a dynamically-allocated struct resource array, before + * calling omap_hwmod_fill_resources(). Returns the number of struct + * resource array elements needed. + * + * XXX This code is not optimized. It could attempt to merge adjacent + * resource IDs. + * + */ +int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags) +{ + int ret = 0; + + if (flags & IORESOURCE_IRQ) + ret += _count_mpu_irqs(oh); + + if (flags & IORESOURCE_DMA) + ret += _count_sdma_reqs(oh); + + if (flags & IORESOURCE_MEM) { + int i = 0; + struct omap_hwmod_ocp_if *os; + struct list_head *p = oh->slave_ports.next; + + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + ret += _count_ocp_if_addr_spaces(os); + } + } + + return ret; +} + +/** + * omap_hwmod_fill_resources - fill struct resource array with hwmod data + * @oh: struct omap_hwmod * + * @res: pointer to the first element of an array of struct resource to fill + * + * Fill the struct resource array @res with resource data from the + * omap_hwmod @oh. Intended to be called by code that registers + * omap_devices. See also omap_hwmod_count_resources(). Returns the + * number of array elements filled. + */ +int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res) +{ + struct omap_hwmod_ocp_if *os; + struct list_head *p; + int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt; + int r = 0; + + /* For each IRQ, DMA, memory area, fill in array.*/ + + mpu_irqs_cnt = _count_mpu_irqs(oh); + for (i = 0; i < mpu_irqs_cnt; i++) { + unsigned int irq; + + if (oh->xlate_irq) + irq = oh->xlate_irq((oh->mpu_irqs + i)->irq); + else + irq = (oh->mpu_irqs + i)->irq; + (res + r)->name = (oh->mpu_irqs + i)->name; + (res + r)->start = irq; + (res + r)->end = irq; + (res + r)->flags = IORESOURCE_IRQ; + r++; + } + + sdma_reqs_cnt = _count_sdma_reqs(oh); + for (i = 0; i < sdma_reqs_cnt; i++) { + (res + r)->name = (oh->sdma_reqs + i)->name; + (res + r)->start = (oh->sdma_reqs + i)->dma_req; + (res + r)->end = (oh->sdma_reqs + i)->dma_req; + (res + r)->flags = IORESOURCE_DMA; + r++; + } + + p = oh->slave_ports.next; + + i = 0; + while (i < oh->slaves_cnt) { + os = _fetch_next_ocp_if(&p, &i); + addr_cnt = _count_ocp_if_addr_spaces(os); + + for (j = 0; j < addr_cnt; j++) { + (res + r)->name = (os->addr + j)->name; + (res + r)->start = (os->addr + j)->pa_start; + (res + r)->end = (os->addr + j)->pa_end; + (res + r)->flags = IORESOURCE_MEM; + r++; + } + } + + return r; +} + +/** + * omap_hwmod_fill_dma_resources - fill struct resource array with dma data + * @oh: struct omap_hwmod * + * @res: pointer to the array of struct resource to fill + * + * Fill the struct resource array @res with dma resource data from the + * omap_hwmod @oh. Intended to be called by code that registers + * omap_devices. See also omap_hwmod_count_resources(). Returns the + * number of array elements filled. + */ +int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res) +{ + int i, sdma_reqs_cnt; + int r = 0; + + sdma_reqs_cnt = _count_sdma_reqs(oh); + for (i = 0; i < sdma_reqs_cnt; i++) { + (res + r)->name = (oh->sdma_reqs + i)->name; + (res + r)->start = (oh->sdma_reqs + i)->dma_req; + (res + r)->end = (oh->sdma_reqs + i)->dma_req; + (res + r)->flags = IORESOURCE_DMA; + r++; + } + + return r; +} + +/** + * omap_hwmod_get_resource_byname - fetch IP block integration data by name + * @oh: struct omap_hwmod * to operate on + * @type: one of the IORESOURCE_* constants from include/linux/ioport.h + * @name: pointer to the name of the data to fetch (optional) + * @rsrc: pointer to a struct resource, allocated by the caller + * + * Retrieve MPU IRQ, SDMA request line, or address space start/end + * data for the IP block pointed to by @oh. The data will be filled + * into a struct resource record pointed to by @rsrc. The struct + * resource must be allocated by the caller. When @name is non-null, + * the data associated with the matching entry in the IRQ/SDMA/address + * space hwmod data arrays will be returned. If @name is null, the + * first array entry will be returned. Data order is not meaningful + * in hwmod data, so callers are strongly encouraged to use a non-null + * @name whenever possible to avoid unpredictable effects if hwmod + * data is later added that causes data ordering to change. This + * function is only intended for use by OMAP core code. Device + * drivers should not call this function - the appropriate bus-related + * data accessor functions should be used instead. Returns 0 upon + * success or a negative error code upon error. + */ +int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type, + const char *name, struct resource *rsrc) +{ + int r; + unsigned int irq, dma; + u32 pa_start, pa_end; + + if (!oh || !rsrc) + return -EINVAL; + + if (type == IORESOURCE_IRQ) { + r = _get_mpu_irq_by_name(oh, name, &irq); + if (r) + return r; + + rsrc->start = irq; + rsrc->end = irq; + } else if (type == IORESOURCE_DMA) { + r = _get_sdma_req_by_name(oh, name, &dma); + if (r) + return r; + + rsrc->start = dma; + rsrc->end = dma; + } else if (type == IORESOURCE_MEM) { + r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end); + if (r) + return r; + + rsrc->start = pa_start; + rsrc->end = pa_end; + } else { + return -EINVAL; + } + + rsrc->flags = type; + rsrc->name = name; + + return 0; +} + +/** + * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain + * @oh: struct omap_hwmod * + * + * Return the powerdomain pointer associated with the OMAP module + * @oh's main clock. If @oh does not have a main clk, return the + * powerdomain associated with the interface clock associated with the + * module's MPU port. (XXX Perhaps this should use the SDMA port + * instead?) Returns NULL on error, or a struct powerdomain * on + * success. + */ +struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh) +{ + struct clk *c; + struct omap_hwmod_ocp_if *oi; + struct clockdomain *clkdm; + struct clk_hw_omap *clk; + + if (!oh) + return NULL; + + if (oh->clkdm) + return oh->clkdm->pwrdm.ptr; + + if (oh->_clk) { + c = oh->_clk; + } else { + oi = _find_mpu_rt_port(oh); + if (!oi) + return NULL; + c = oi->_clk; + } + + clk = to_clk_hw_omap(__clk_get_hw(c)); + clkdm = clk->clkdm; + if (!clkdm) + return NULL; + + return clkdm->pwrdm.ptr; +} + +/** + * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU) + * @oh: struct omap_hwmod * + * + * Returns the virtual address corresponding to the beginning of the + * module's register target, in the address range that is intended to + * be used by the MPU. Returns the virtual address upon success or NULL + * upon error. + */ +void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh) +{ + if (!oh) + return NULL; + + if (oh->_int_flags & _HWMOD_NO_MPU_PORT) + return NULL; + + if (oh->_state == _HWMOD_STATE_UNKNOWN) + return NULL; + + return oh->_mpu_rt_va; +} + +/* + * XXX what about functions for drivers to save/restore ocp_sysconfig + * for context save/restore operations? + */ + +/** + * omap_hwmod_enable_wakeup - allow device to wake up the system + * @oh: struct omap_hwmod * + * + * Sets the module OCP socket ENAWAKEUP bit to allow the module to + * send wakeups to the PRCM, and enable I/O ring wakeup events for + * this IP block if it has dynamic mux entries. Eventually this + * should set PRCM wakeup registers to cause the PRCM to receive + * wakeup events from the module. Does not set any wakeup routing + * registers beyond this point - if the module is to wake up any other + * module or subsystem, that must be set separately. Called by + * omap_device code. Returns -EINVAL on error or 0 upon success. + */ +int omap_hwmod_enable_wakeup(struct omap_hwmod *oh) +{ + unsigned long flags; + u32 v; + + spin_lock_irqsave(&oh->_lock, flags); + + if (oh->class->sysc && + (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) { + v = oh->_sysc_cache; + _enable_wakeup(oh, &v); + _write_sysconfig(v, oh); + } + + _set_idle_ioring_wakeup(oh, true); + spin_unlock_irqrestore(&oh->_lock, flags); + + return 0; +} + +/** + * omap_hwmod_disable_wakeup - prevent device from waking the system + * @oh: struct omap_hwmod * + * + * Clears the module OCP socket ENAWAKEUP bit to prevent the module + * from sending wakeups to the PRCM, and disable I/O ring wakeup + * events for this IP block if it has dynamic mux entries. Eventually + * this should clear PRCM wakeup registers to cause the PRCM to ignore + * wakeup events from the module. Does not set any wakeup routing + * registers beyond this point - if the module is to wake up any other + * module or subsystem, that must be set separately. Called by + * omap_device code. Returns -EINVAL on error or 0 upon success. + */ +int omap_hwmod_disable_wakeup(struct omap_hwmod *oh) +{ + unsigned long flags; + u32 v; + + spin_lock_irqsave(&oh->_lock, flags); + + if (oh->class->sysc && + (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) { + v = oh->_sysc_cache; + _disable_wakeup(oh, &v); + _write_sysconfig(v, oh); + } + + _set_idle_ioring_wakeup(oh, false); + spin_unlock_irqrestore(&oh->_lock, flags); + + return 0; +} + +/** + * omap_hwmod_assert_hardreset - assert the HW reset line of submodules + * contained in the hwmod module. + * @oh: struct omap_hwmod * + * @name: name of the reset line to lookup and assert + * + * Some IP like dsp, ipu or iva contain processor that require + * an HW reset line to be assert / deassert in order to enable fully + * the IP. Returns -EINVAL if @oh is null or if the operation is not + * yet supported on this OMAP; otherwise, passes along the return value + * from _assert_hardreset(). + */ +int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name) +{ + int ret; + unsigned long flags; + + if (!oh) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + ret = _assert_hardreset(oh, name); + spin_unlock_irqrestore(&oh->_lock, flags); + + return ret; +} + +/** + * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules + * contained in the hwmod module. + * @oh: struct omap_hwmod * + * @name: name of the reset line to look up and deassert + * + * Some IP like dsp, ipu or iva contain processor that require + * an HW reset line to be assert / deassert in order to enable fully + * the IP. Returns -EINVAL if @oh is null or if the operation is not + * yet supported on this OMAP; otherwise, passes along the return value + * from _deassert_hardreset(). + */ +int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name) +{ + int ret; + unsigned long flags; + + if (!oh) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + ret = _deassert_hardreset(oh, name); + spin_unlock_irqrestore(&oh->_lock, flags); + + return ret; +} + +/** + * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname + * @classname: struct omap_hwmod_class name to search for + * @fn: callback function pointer to call for each hwmod in class @classname + * @user: arbitrary context data to pass to the callback function + * + * For each omap_hwmod of class @classname, call @fn. + * If the callback function returns something other than + * zero, the iterator is terminated, and the callback function's return + * value is passed back to the caller. Returns 0 upon success, -EINVAL + * if @classname or @fn are NULL, or passes back the error code from @fn. + */ +int omap_hwmod_for_each_by_class(const char *classname, + int (*fn)(struct omap_hwmod *oh, + void *user), + void *user) +{ + struct omap_hwmod *temp_oh; + int ret = 0; + + if (!classname || !fn) + return -EINVAL; + + pr_debug("omap_hwmod: %s: looking for modules of class %s\n", + __func__, classname); + + list_for_each_entry(temp_oh, &omap_hwmod_list, node) { + if (!strcmp(temp_oh->class->name, classname)) { + pr_debug("omap_hwmod: %s: %s: calling callback fn\n", + __func__, temp_oh->name); + ret = (*fn)(temp_oh, user); + if (ret) + break; + } + } + + if (ret) + pr_debug("omap_hwmod: %s: iterator terminated early: %d\n", + __func__, ret); + + return ret; +} + +/** + * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod + * @oh: struct omap_hwmod * + * @state: state that _setup() should leave the hwmod in + * + * Sets the hwmod state that @oh will enter at the end of _setup() + * (called by omap_hwmod_setup_*()). See also the documentation + * for _setup_postsetup(), above. Returns 0 upon success or + * -EINVAL if there is a problem with the arguments or if the hwmod is + * in the wrong state. + */ +int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state) +{ + int ret; + unsigned long flags; + + if (!oh) + return -EINVAL; + + if (state != _HWMOD_STATE_DISABLED && + state != _HWMOD_STATE_ENABLED && + state != _HWMOD_STATE_IDLE) + return -EINVAL; + + spin_lock_irqsave(&oh->_lock, flags); + + if (oh->_state != _HWMOD_STATE_REGISTERED) { + ret = -EINVAL; + goto ohsps_unlock; + } + + oh->_postsetup_state = state; + ret = 0; + +ohsps_unlock: + spin_unlock_irqrestore(&oh->_lock, flags); + + return ret; +} + +/** + * omap_hwmod_get_context_loss_count - get lost context count + * @oh: struct omap_hwmod * + * + * Returns the context loss count of associated @oh + * upon success, or zero if no context loss data is available. + * + * On OMAP4, this queries the per-hwmod context loss register, + * assuming one exists. If not, or on OMAP2/3, this queries the + * enclosing powerdomain context loss count. + */ +int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh) +{ + struct powerdomain *pwrdm; + int ret = 0; + + if (soc_ops.get_context_lost) + return soc_ops.get_context_lost(oh); + + pwrdm = omap_hwmod_get_pwrdm(oh); + if (pwrdm) + ret = pwrdm_get_context_loss_count(pwrdm); + + return ret; +} + +/** + * omap_hwmod_init - initialize the hwmod code + * + * Sets up some function pointers needed by the hwmod code to operate on the + * currently-booted SoC. Intended to be called once during kernel init + * before any hwmods are registered. No return value. + */ +void __init omap_hwmod_init(void) +{ + if (cpu_is_omap24xx()) { + soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready; + soc_ops.assert_hardreset = _omap2_assert_hardreset; + soc_ops.deassert_hardreset = _omap2_deassert_hardreset; + soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted; + } else if (cpu_is_omap34xx()) { + soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready; + soc_ops.assert_hardreset = _omap2_assert_hardreset; + soc_ops.deassert_hardreset = _omap2_deassert_hardreset; + soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted; + soc_ops.init_clkdm = _init_clkdm; + } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) { + soc_ops.enable_module = _omap4_enable_module; + soc_ops.disable_module = _omap4_disable_module; + soc_ops.wait_target_ready = _omap4_wait_target_ready; + soc_ops.assert_hardreset = _omap4_assert_hardreset; + soc_ops.deassert_hardreset = _omap4_deassert_hardreset; + soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted; + soc_ops.init_clkdm = _init_clkdm; + soc_ops.update_context_lost = _omap4_update_context_lost; + soc_ops.get_context_lost = _omap4_get_context_lost; + } else if (cpu_is_ti816x() || soc_is_am33xx() || soc_is_am43xx()) { + soc_ops.enable_module = _omap4_enable_module; + soc_ops.disable_module = _omap4_disable_module; + soc_ops.wait_target_ready = _omap4_wait_target_ready; + soc_ops.assert_hardreset = _omap4_assert_hardreset; + soc_ops.deassert_hardreset = _am33xx_deassert_hardreset; + soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted; + soc_ops.init_clkdm = _init_clkdm; + } else { + WARN(1, "omap_hwmod: unknown SoC type\n"); + } + + inited = true; +} + +/** + * omap_hwmod_get_main_clk - get pointer to main clock name + * @oh: struct omap_hwmod * + * + * Returns the main clock name assocated with @oh upon success, + * or NULL if @oh is NULL. + */ +const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh) +{ + if (!oh) + return NULL; + + return oh->main_clk; +} |