diff options
Diffstat (limited to 'arch/arm/mach-omap2/pm34xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c new file mode 100644 index 000000000..87b98bf92 --- /dev/null +++ b/arch/arm/mach-omap2/pm34xx.c @@ -0,0 +1,580 @@ +/* + * OMAP3 Power Management Routines + * + * Copyright (C) 2006-2008 Nokia Corporation + * Tony Lindgren <tony@atomide.com> + * Jouni Hogander + * + * Copyright (C) 2007 Texas Instruments, Inc. + * Rajendra Nayak <rnayak@ti.com> + * + * Copyright (C) 2005 Texas Instruments, Inc. + * Richard Woodruff <r-woodruff2@ti.com> + * + * Based on pm.c for omap1 + * + * 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. + */ + +#include <linux/pm.h> +#include <linux/suspend.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/list.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/omap-dma.h> +#include <linux/omap-gpmc.h> +#include <linux/platform_data/gpio-omap.h> + +#include <trace/events/power.h> + +#include <asm/fncpy.h> +#include <asm/suspend.h> +#include <asm/system_misc.h> + +#include "clockdomain.h" +#include "powerdomain.h" +#include "soc.h" +#include "common.h" +#include "cm3xxx.h" +#include "cm-regbits-34xx.h" +#include "prm-regbits-34xx.h" +#include "prm3xxx.h" +#include "pm.h" +#include "sdrc.h" +#include "sram.h" +#include "control.h" +#include "vc.h" + +/* pm34xx errata defined in pm.h */ +u16 pm34xx_errata; + +struct power_state { + struct powerdomain *pwrdm; + u32 next_state; +#ifdef CONFIG_SUSPEND + u32 saved_state; +#endif + struct list_head node; +}; + +static LIST_HEAD(pwrst_list); + +static int (*_omap_save_secure_sram)(u32 *addr); +void (*omap3_do_wfi_sram)(void); + +static struct powerdomain *mpu_pwrdm, *neon_pwrdm; +static struct powerdomain *core_pwrdm, *per_pwrdm; + +static void omap3_core_save_context(void) +{ + omap3_ctrl_save_padconf(); + + /* + * Force write last pad into memory, as this can fail in some + * cases according to errata 1.157, 1.185 + */ + omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14), + OMAP343X_CONTROL_MEM_WKUP + 0x2a0); + + /* Save the Interrupt controller context */ + omap_intc_save_context(); + /* Save the GPMC context */ + omap3_gpmc_save_context(); + /* Save the system control module context, padconf already save above*/ + omap3_control_save_context(); + omap_dma_global_context_save(); +} + +static void omap3_core_restore_context(void) +{ + /* Restore the control module context, padconf restored by h/w */ + omap3_control_restore_context(); + /* Restore the GPMC context */ + omap3_gpmc_restore_context(); + /* Restore the interrupt controller context */ + omap_intc_restore_context(); + omap_dma_global_context_restore(); +} + +/* + * FIXME: This function should be called before entering off-mode after + * OMAP3 secure services have been accessed. Currently it is only called + * once during boot sequence, but this works as we are not using secure + * services. + */ +static void omap3_save_secure_ram_context(void) +{ + u32 ret; + int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); + + if (omap_type() != OMAP2_DEVICE_TYPE_GP) { + /* + * MPU next state must be set to POWER_ON temporarily, + * otherwise the WFI executed inside the ROM code + * will hang the system. + */ + pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); + ret = _omap_save_secure_sram((u32 *)(unsigned long) + __pa(omap3_secure_ram_storage)); + pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state); + /* Following is for error tracking, it should not happen */ + if (ret) { + pr_err("save_secure_sram() returns %08x\n", ret); + while (1) + ; + } + } +} + +static irqreturn_t _prcm_int_handle_io(int irq, void *unused) +{ + int c; + + c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, OMAP3430_ST_IO_MASK | + OMAP3430_ST_IO_CHAIN_MASK); + + return c ? IRQ_HANDLED : IRQ_NONE; +} + +static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused) +{ + int c; + + /* + * Clear all except ST_IO and ST_IO_CHAIN for wkup module, + * these are handled in a separate handler to avoid acking + * IO events before parsing in mux code + */ + c = omap_prm_clear_mod_irqs(WKUP_MOD, 1, ~(OMAP3430_ST_IO_MASK | + OMAP3430_ST_IO_CHAIN_MASK)); + c += omap_prm_clear_mod_irqs(CORE_MOD, 1, ~0); + c += omap_prm_clear_mod_irqs(OMAP3430_PER_MOD, 1, ~0); + if (omap_rev() > OMAP3430_REV_ES1_0) { + c += omap_prm_clear_mod_irqs(CORE_MOD, 3, ~0); + c += omap_prm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, ~0); + } + + return c ? IRQ_HANDLED : IRQ_NONE; +} + +static void omap34xx_save_context(u32 *save) +{ + u32 val; + + /* Read Auxiliary Control Register */ + asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val)); + *save++ = 1; + *save++ = val; + + /* Read L2 AUX ctrl register */ + asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val)); + *save++ = 1; + *save++ = val; +} + +static int omap34xx_do_sram_idle(unsigned long save_state) +{ + omap34xx_cpu_suspend(save_state); + return 0; +} + +void omap_sram_idle(void) +{ + /* Variable to tell what needs to be saved and restored + * in omap_sram_idle*/ + /* save_state = 0 => Nothing to save and restored */ + /* save_state = 1 => Only L1 and logic lost */ + /* save_state = 2 => Only L2 lost */ + /* save_state = 3 => L1, L2 and logic lost */ + int save_state = 0; + int mpu_next_state = PWRDM_POWER_ON; + int per_next_state = PWRDM_POWER_ON; + int core_next_state = PWRDM_POWER_ON; + int per_going_off; + int core_prev_state; + u32 sdrc_pwr = 0; + + mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); + switch (mpu_next_state) { + case PWRDM_POWER_ON: + case PWRDM_POWER_RET: + /* No need to save context */ + save_state = 0; + break; + case PWRDM_POWER_OFF: + save_state = 3; + break; + default: + /* Invalid state */ + pr_err("Invalid mpu state in sram_idle\n"); + return; + } + + /* NEON control */ + if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON) + pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state); + + /* Enable IO-PAD and IO-CHAIN wakeups */ + per_next_state = pwrdm_read_next_pwrst(per_pwrdm); + core_next_state = pwrdm_read_next_pwrst(core_pwrdm); + + pwrdm_pre_transition(NULL); + + /* PER */ + if (per_next_state < PWRDM_POWER_ON) { + per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0; + omap2_gpio_prepare_for_idle(per_going_off); + } + + /* CORE */ + if (core_next_state < PWRDM_POWER_ON) { + if (core_next_state == PWRDM_POWER_OFF) { + omap3_core_save_context(); + omap3_cm_save_context(); + } + } + + /* Configure PMIC signaling for I2C4 or sys_off_mode */ + omap3_vc_set_pmic_signaling(core_next_state); + + omap3_intc_prepare_idle(); + + /* + * On EMU/HS devices ROM code restores a SRDC value + * from scratchpad which has automatic self refresh on timeout + * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443. + * Hence store/restore the SDRC_POWER register here. + */ + if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && + (omap_type() == OMAP2_DEVICE_TYPE_EMU || + omap_type() == OMAP2_DEVICE_TYPE_SEC) && + core_next_state == PWRDM_POWER_OFF) + sdrc_pwr = sdrc_read_reg(SDRC_POWER); + + /* + * omap3_arm_context is the location where some ARM context + * get saved. The rest is placed on the stack, and restored + * from there before resuming. + */ + if (save_state) + omap34xx_save_context(omap3_arm_context); + if (save_state == 1 || save_state == 3) + cpu_suspend(save_state, omap34xx_do_sram_idle); + else + omap34xx_do_sram_idle(save_state); + + /* Restore normal SDRC POWER settings */ + if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && + (omap_type() == OMAP2_DEVICE_TYPE_EMU || + omap_type() == OMAP2_DEVICE_TYPE_SEC) && + core_next_state == PWRDM_POWER_OFF) + sdrc_write_reg(sdrc_pwr, SDRC_POWER); + + /* CORE */ + if (core_next_state < PWRDM_POWER_ON) { + core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm); + if (core_prev_state == PWRDM_POWER_OFF) { + omap3_core_restore_context(); + omap3_cm_restore_context(); + omap3_sram_restore_context(); + omap2_sms_restore_context(); + } + } + omap3_intc_resume_idle(); + + pwrdm_post_transition(NULL); + + /* PER */ + if (per_next_state < PWRDM_POWER_ON) + omap2_gpio_resume_after_idle(); +} + +static void omap3_pm_idle(void) +{ + if (omap_irq_pending()) + return; + + trace_cpu_idle(1, smp_processor_id()); + + omap_sram_idle(); + + trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); +} + +#ifdef CONFIG_SUSPEND +static int omap3_pm_suspend(void) +{ + struct power_state *pwrst; + int state, ret = 0; + + /* Read current next_pwrsts */ + list_for_each_entry(pwrst, &pwrst_list, node) + pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm); + /* Set ones wanted by suspend */ + list_for_each_entry(pwrst, &pwrst_list, node) { + if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state)) + goto restore; + if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm)) + goto restore; + } + + omap3_intc_suspend(); + + omap_sram_idle(); + +restore: + /* Restore next_pwrsts */ + list_for_each_entry(pwrst, &pwrst_list, node) { + state = pwrdm_read_prev_pwrst(pwrst->pwrdm); + if (state > pwrst->next_state) { + pr_info("Powerdomain (%s) didn't enter target state %d\n", + pwrst->pwrdm->name, pwrst->next_state); + ret = -1; + } + omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state); + } + if (ret) + pr_err("Could not enter target state in pm_suspend\n"); + else + pr_info("Successfully put all powerdomains to target state\n"); + + return ret; +} +#else +#define omap3_pm_suspend NULL +#endif /* CONFIG_SUSPEND */ + +static void __init prcm_setup_regs(void) +{ + omap3_ctrl_init(); + + omap3_prm_init_pm(cpu_is_omap3630(), omap3_has_iva()); +} + +void omap3_pm_off_mode_enable(int enable) +{ + struct power_state *pwrst; + u32 state; + + if (enable) + state = PWRDM_POWER_OFF; + else + state = PWRDM_POWER_RET; + + list_for_each_entry(pwrst, &pwrst_list, node) { + if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) && + pwrst->pwrdm == core_pwrdm && + state == PWRDM_POWER_OFF) { + pwrst->next_state = PWRDM_POWER_RET; + pr_warn("%s: Core OFF disabled due to errata i583\n", + __func__); + } else { + pwrst->next_state = state; + } + omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); + } +} + +int omap3_pm_get_suspend_state(struct powerdomain *pwrdm) +{ + struct power_state *pwrst; + + list_for_each_entry(pwrst, &pwrst_list, node) { + if (pwrst->pwrdm == pwrdm) + return pwrst->next_state; + } + return -EINVAL; +} + +int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state) +{ + struct power_state *pwrst; + + list_for_each_entry(pwrst, &pwrst_list, node) { + if (pwrst->pwrdm == pwrdm) { + pwrst->next_state = state; + return 0; + } + } + return -EINVAL; +} + +static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused) +{ + struct power_state *pwrst; + + if (!pwrdm->pwrsts) + return 0; + + pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC); + if (!pwrst) + return -ENOMEM; + pwrst->pwrdm = pwrdm; + pwrst->next_state = PWRDM_POWER_RET; + list_add(&pwrst->node, &pwrst_list); + + if (pwrdm_has_hdwr_sar(pwrdm)) + pwrdm_enable_hdwr_sar(pwrdm); + + return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); +} + +/* + * Push functions to SRAM + * + * The minimum set of functions is pushed to SRAM for execution: + * - omap3_do_wfi for erratum i581 WA, + * - save_secure_ram_context for security extensions. + */ +void omap_push_sram_idle(void) +{ + omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz); + + if (omap_type() != OMAP2_DEVICE_TYPE_GP) + _omap_save_secure_sram = omap_sram_push(save_secure_ram_context, + save_secure_ram_context_sz); +} + +static void __init pm_errata_configure(void) +{ + if (cpu_is_omap3630()) { + pm34xx_errata |= PM_RTA_ERRATUM_i608; + /* Enable the l2 cache toggling in sleep logic */ + enable_omap3630_toggle_l2_on_restore(); + if (omap_rev() < OMAP3630_REV_ES1_2) + pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 | + PM_PER_MEMORIES_ERRATUM_i582); + } else if (cpu_is_omap34xx()) { + pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582; + } +} + +int __init omap3_pm_init(void) +{ + struct power_state *pwrst, *tmp; + struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm; + int ret; + + if (!omap3_has_io_chain_ctrl()) + pr_warn("PM: no software I/O chain control; some wakeups may be lost\n"); + + pm_errata_configure(); + + /* XXX prcm_setup_regs needs to be before enabling hw + * supervised mode for powerdomains */ + prcm_setup_regs(); + + ret = request_irq(omap_prcm_event_to_irq("wkup"), + _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL); + + if (ret) { + pr_err("pm: Failed to request pm_wkup irq\n"); + goto err1; + } + + /* IO interrupt is shared with mux code */ + ret = request_irq(omap_prcm_event_to_irq("io"), + _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io", + omap3_pm_init); + enable_irq(omap_prcm_event_to_irq("io")); + + if (ret) { + pr_err("pm: Failed to request pm_io irq\n"); + goto err2; + } + + ret = pwrdm_for_each(pwrdms_setup, NULL); + if (ret) { + pr_err("Failed to setup powerdomains\n"); + goto err3; + } + + (void) clkdm_for_each(omap_pm_clkdms_setup, NULL); + + mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); + if (mpu_pwrdm == NULL) { + pr_err("Failed to get mpu_pwrdm\n"); + ret = -EINVAL; + goto err3; + } + + neon_pwrdm = pwrdm_lookup("neon_pwrdm"); + per_pwrdm = pwrdm_lookup("per_pwrdm"); + core_pwrdm = pwrdm_lookup("core_pwrdm"); + + neon_clkdm = clkdm_lookup("neon_clkdm"); + mpu_clkdm = clkdm_lookup("mpu_clkdm"); + per_clkdm = clkdm_lookup("per_clkdm"); + wkup_clkdm = clkdm_lookup("wkup_clkdm"); + + omap_common_suspend_init(omap3_pm_suspend); + + arm_pm_idle = omap3_pm_idle; + omap3_idle_init(); + + /* + * RTA is disabled during initialization as per erratum i608 + * it is safer to disable RTA by the bootloader, but we would like + * to be doubly sure here and prevent any mishaps. + */ + if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608)) + omap3630_ctrl_disable_rta(); + + /* + * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are + * not correctly reset when the PER powerdomain comes back + * from OFF or OSWR when the CORE powerdomain is kept active. + * See OMAP36xx Erratum i582 "PER Domain reset issue after + * Domain-OFF/OSWR Wakeup". This wakeup dependency is not a + * complete workaround. The kernel must also prevent the PER + * powerdomain from going to OSWR/OFF while the CORE + * powerdomain is not going to OSWR/OFF. And if PER last + * power state was off while CORE last power state was ON, the + * UART3/4 and McBSP2/3 SIDETONE devices need to run a + * self-test using their loopback tests; if that fails, those + * devices are unusable until the PER/CORE can complete a transition + * from ON to OSWR/OFF and then back to ON. + * + * XXX Technically this workaround is only needed if off-mode + * or OSWR is enabled. + */ + if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582)) + clkdm_add_wkdep(per_clkdm, wkup_clkdm); + + clkdm_add_wkdep(neon_clkdm, mpu_clkdm); + if (omap_type() != OMAP2_DEVICE_TYPE_GP) { + omap3_secure_ram_storage = + kmalloc(0x803F, GFP_KERNEL); + if (!omap3_secure_ram_storage) + pr_err("Memory allocation failed when allocating for secure sram context\n"); + + local_irq_disable(); + + omap_dma_global_context_save(); + omap3_save_secure_ram_context(); + omap_dma_global_context_restore(); + + local_irq_enable(); + } + + omap3_save_scratchpad_contents(); + return ret; + +err3: + list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) { + list_del(&pwrst->node); + kfree(pwrst); + } + free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init); +err2: + free_irq(omap_prcm_event_to_irq("wkup"), NULL); +err1: + return ret; +} |