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-rw-r--r--arch/arm/mach-omap2/cm_common.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/cm_common.c b/arch/arm/mach-omap2/cm_common.c
new file mode 100644
index 000000000..23e8bcec3
--- /dev/null
+++ b/arch/arm/mach-omap2/cm_common.c
@@ -0,0 +1,370 @@
+/*
+ * OMAP2+ common Clock Management (CM) IP block functions
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ * Paul Walmsley
+ *
+ * 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.
+ *
+ * XXX This code should eventually be moved to a CM driver.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "cm2xxx.h"
+#include "cm3xxx.h"
+#include "cm33xx.h"
+#include "cm44xx.h"
+#include "clock.h"
+
+/*
+ * cm_ll_data: function pointers to SoC-specific implementations of
+ * common CM functions
+ */
+static struct cm_ll_data null_cm_ll_data;
+static struct cm_ll_data *cm_ll_data = &null_cm_ll_data;
+
+/* cm_base: base virtual address of the CM IP block */
+void __iomem *cm_base;
+
+/* cm2_base: base virtual address of the CM2 IP block (OMAP44xx only) */
+void __iomem *cm2_base;
+
+#define CM_NO_CLOCKS 0x1
+#define CM_SINGLE_INSTANCE 0x2
+
+/**
+ * omap2_set_globals_cm - set the CM/CM2 base addresses (for early use)
+ * @cm: CM base virtual address
+ * @cm2: CM2 base virtual address (if present on the booted SoC)
+ *
+ * XXX Will be replaced when the PRM/CM drivers are completed.
+ */
+void __init omap2_set_globals_cm(void __iomem *cm, void __iomem *cm2)
+{
+ cm_base = cm;
+ cm2_base = cm2;
+}
+
+/**
+ * cm_split_idlest_reg - split CM_IDLEST reg addr into its components
+ * @idlest_reg: CM_IDLEST* virtual address
+ * @prcm_inst: pointer to an s16 to return the PRCM instance offset
+ * @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID
+ *
+ * Given an absolute CM_IDLEST register address @idlest_reg, passes
+ * the PRCM instance offset and IDLEST register ID back to the caller
+ * via the @prcm_inst and @idlest_reg_id. Returns -EINVAL upon error,
+ * or 0 upon success. XXX This function is only needed until absolute
+ * register addresses are removed from the OMAP struct clk records.
+ */
+int cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst,
+ u8 *idlest_reg_id)
+{
+ if (!cm_ll_data->split_idlest_reg) {
+ WARN_ONCE(1, "cm: %s: no low-level function defined\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ return cm_ll_data->split_idlest_reg(idlest_reg, prcm_inst,
+ idlest_reg_id);
+}
+
+/**
+ * omap_cm_wait_module_ready - wait for a module to leave idle or standby
+ * @part: PRCM partition
+ * @prcm_mod: PRCM module offset
+ * @idlest_reg: CM_IDLESTx register
+ * @idlest_shift: shift of the bit in the CM_IDLEST* register to check
+ *
+ * Wait for the PRCM to indicate that the module identified by
+ * (@prcm_mod, @idlest_id, @idlest_shift) is clocked. Return 0 upon
+ * success, -EBUSY if the module doesn't enable in time, or -EINVAL if
+ * no per-SoC wait_module_ready() function pointer has been registered
+ * or if the idlest register is unknown on the SoC.
+ */
+int omap_cm_wait_module_ready(u8 part, s16 prcm_mod, u16 idlest_reg,
+ u8 idlest_shift)
+{
+ if (!cm_ll_data->wait_module_ready) {
+ WARN_ONCE(1, "cm: %s: no low-level function defined\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ return cm_ll_data->wait_module_ready(part, prcm_mod, idlest_reg,
+ idlest_shift);
+}
+
+/**
+ * omap_cm_wait_module_idle - wait for a module to enter idle or standby
+ * @part: PRCM partition
+ * @prcm_mod: PRCM module offset
+ * @idlest_reg: CM_IDLESTx register
+ * @idlest_shift: shift of the bit in the CM_IDLEST* register to check
+ *
+ * Wait for the PRCM to indicate that the module identified by
+ * (@prcm_mod, @idlest_id, @idlest_shift) is no longer clocked. Return
+ * 0 upon success, -EBUSY if the module doesn't enable in time, or
+ * -EINVAL if no per-SoC wait_module_idle() function pointer has been
+ * registered or if the idlest register is unknown on the SoC.
+ */
+int omap_cm_wait_module_idle(u8 part, s16 prcm_mod, u16 idlest_reg,
+ u8 idlest_shift)
+{
+ if (!cm_ll_data->wait_module_idle) {
+ WARN_ONCE(1, "cm: %s: no low-level function defined\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ return cm_ll_data->wait_module_idle(part, prcm_mod, idlest_reg,
+ idlest_shift);
+}
+
+/**
+ * omap_cm_module_enable - enable a module
+ * @mode: target mode for the module
+ * @part: PRCM partition
+ * @inst: PRCM instance
+ * @clkctrl_offs: CM_CLKCTRL register offset for the module
+ *
+ * Enables clocks for a module identified by (@part, @inst, @clkctrl_offs)
+ * making its IO space accessible. Return 0 upon success, -EINVAL if no
+ * per-SoC module_enable() function pointer has been registered.
+ */
+int omap_cm_module_enable(u8 mode, u8 part, u16 inst, u16 clkctrl_offs)
+{
+ if (!cm_ll_data->module_enable) {
+ WARN_ONCE(1, "cm: %s: no low-level function defined\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ cm_ll_data->module_enable(mode, part, inst, clkctrl_offs);
+ return 0;
+}
+
+/**
+ * omap_cm_module_disable - disable a module
+ * @part: PRCM partition
+ * @inst: PRCM instance
+ * @clkctrl_offs: CM_CLKCTRL register offset for the module
+ *
+ * Disables clocks for a module identified by (@part, @inst, @clkctrl_offs)
+ * makings its IO space inaccessible. Return 0 upon success, -EINVAL if
+ * no per-SoC module_disable() function pointer has been registered.
+ */
+int omap_cm_module_disable(u8 part, u16 inst, u16 clkctrl_offs)
+{
+ if (!cm_ll_data->module_disable) {
+ WARN_ONCE(1, "cm: %s: no low-level function defined\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ cm_ll_data->module_disable(part, inst, clkctrl_offs);
+ return 0;
+}
+
+/**
+ * cm_register - register per-SoC low-level data with the CM
+ * @cld: low-level per-SoC OMAP CM data & function pointers to register
+ *
+ * Register per-SoC low-level OMAP CM data and function pointers with
+ * the OMAP CM common interface. The caller must keep the data
+ * pointed to by @cld valid until it calls cm_unregister() and
+ * it returns successfully. Returns 0 upon success, -EINVAL if @cld
+ * is NULL, or -EEXIST if cm_register() has already been called
+ * without an intervening cm_unregister().
+ */
+int cm_register(struct cm_ll_data *cld)
+{
+ if (!cld)
+ return -EINVAL;
+
+ if (cm_ll_data != &null_cm_ll_data)
+ return -EEXIST;
+
+ cm_ll_data = cld;
+
+ return 0;
+}
+
+/**
+ * cm_unregister - unregister per-SoC low-level data & function pointers
+ * @cld: low-level per-SoC OMAP CM data & function pointers to unregister
+ *
+ * Unregister per-SoC low-level OMAP CM data and function pointers
+ * that were previously registered with cm_register(). The
+ * caller may not destroy any of the data pointed to by @cld until
+ * this function returns successfully. Returns 0 upon success, or
+ * -EINVAL if @cld is NULL or if @cld does not match the struct
+ * cm_ll_data * previously registered by cm_register().
+ */
+int cm_unregister(struct cm_ll_data *cld)
+{
+ if (!cld || cm_ll_data != cld)
+ return -EINVAL;
+
+ cm_ll_data = &null_cm_ll_data;
+
+ return 0;
+}
+
+#if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
+ defined(CONFIG_SOC_DRA7XX)
+static struct omap_prcm_init_data cm_data __initdata = {
+ .index = TI_CLKM_CM,
+ .init = omap4_cm_init,
+};
+
+static struct omap_prcm_init_data cm2_data __initdata = {
+ .index = TI_CLKM_CM2,
+ .init = omap4_cm_init,
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2
+static struct omap_prcm_init_data omap2_prcm_data __initdata = {
+ .index = TI_CLKM_CM,
+ .init = omap2xxx_cm_init,
+ .flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP3
+static struct omap_prcm_init_data omap3_cm_data __initdata = {
+ .index = TI_CLKM_CM,
+ .init = omap3xxx_cm_init,
+ .flags = CM_SINGLE_INSTANCE,
+
+ /*
+ * IVA2 offset is a negative value, must offset the cm_base address
+ * by this to get it to positive side on the iomap
+ */
+ .offset = -OMAP3430_IVA2_MOD,
+};
+#endif
+
+#if defined(CONFIG_SOC_AM33XX) || defined(CONFIG_SOC_TI81XX)
+static struct omap_prcm_init_data am3_prcm_data __initdata = {
+ .index = TI_CLKM_CM,
+ .flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
+ .init = am33xx_cm_init,
+};
+#endif
+
+#ifdef CONFIG_SOC_AM43XX
+static struct omap_prcm_init_data am4_prcm_data __initdata = {
+ .index = TI_CLKM_CM,
+ .flags = CM_NO_CLOCKS | CM_SINGLE_INSTANCE,
+ .init = omap4_cm_init,
+};
+#endif
+
+static const struct of_device_id omap_cm_dt_match_table[] __initconst = {
+#ifdef CONFIG_ARCH_OMAP2
+ { .compatible = "ti,omap2-prcm", .data = &omap2_prcm_data },
+#endif
+#ifdef CONFIG_ARCH_OMAP3
+ { .compatible = "ti,omap3-cm", .data = &omap3_cm_data },
+#endif
+#ifdef CONFIG_ARCH_OMAP4
+ { .compatible = "ti,omap4-cm1", .data = &cm_data },
+ { .compatible = "ti,omap4-cm2", .data = &cm2_data },
+#endif
+#ifdef CONFIG_SOC_OMAP5
+ { .compatible = "ti,omap5-cm-core-aon", .data = &cm_data },
+ { .compatible = "ti,omap5-cm-core", .data = &cm2_data },
+#endif
+#ifdef CONFIG_SOC_DRA7XX
+ { .compatible = "ti,dra7-cm-core-aon", .data = &cm_data },
+ { .compatible = "ti,dra7-cm-core", .data = &cm2_data },
+#endif
+#ifdef CONFIG_SOC_AM33XX
+ { .compatible = "ti,am3-prcm", .data = &am3_prcm_data },
+#endif
+#ifdef CONFIG_SOC_AM43XX
+ { .compatible = "ti,am4-prcm", .data = &am4_prcm_data },
+#endif
+#ifdef CONFIG_SOC_TI81XX
+ { .compatible = "ti,dm814-prcm", .data = &am3_prcm_data },
+ { .compatible = "ti,dm816-prcm", .data = &am3_prcm_data },
+#endif
+ { }
+};
+
+/**
+ * omap2_cm_base_init - initialize iomappings for the CM drivers
+ *
+ * Detects and initializes the iomappings for the CM driver, based
+ * on the DT data. Returns 0 in success, negative error value
+ * otherwise.
+ */
+int __init omap2_cm_base_init(void)
+{
+ struct device_node *np;
+ const struct of_device_id *match;
+ struct omap_prcm_init_data *data;
+ void __iomem *mem;
+
+ for_each_matching_node_and_match(np, omap_cm_dt_match_table, &match) {
+ data = (struct omap_prcm_init_data *)match->data;
+
+ mem = of_iomap(np, 0);
+ if (!mem)
+ return -ENOMEM;
+
+ if (data->index == TI_CLKM_CM)
+ cm_base = mem + data->offset;
+
+ if (data->index == TI_CLKM_CM2)
+ cm2_base = mem + data->offset;
+
+ data->mem = mem;
+
+ data->np = np;
+
+ if (data->init && (data->flags & CM_SINGLE_INSTANCE ||
+ (cm_base && cm2_base)))
+ data->init(data);
+ }
+
+ return 0;
+}
+
+/**
+ * omap_cm_init - low level init for the CM drivers
+ *
+ * Initializes the low level clock infrastructure for CM drivers.
+ * Returns 0 in success, negative error value in failure.
+ */
+int __init omap_cm_init(void)
+{
+ struct device_node *np;
+ const struct of_device_id *match;
+ const struct omap_prcm_init_data *data;
+ int ret;
+
+ for_each_matching_node_and_match(np, omap_cm_dt_match_table, &match) {
+ data = match->data;
+
+ if (data->flags & CM_NO_CLOCKS)
+ continue;
+
+ ret = omap2_clk_provider_init(np, data->index, NULL, data->mem);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}