1 files changed, 266 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
new file mode 100644
index 00000000000..0dda6cf8b85
--- /dev/null
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -0,0 +1,266 @@
+/*
+ * OMAP4+ Power Management Routines
+ *
+ * Copyright (C) 2010-2013 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ * Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * 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/module.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <asm/system_misc.h>
+
+#include "soc.h"
+#include "common.h"
+#include "clockdomain.h"
+#include "powerdomain.h"
+#include "pm.h"
+
+u16 pm44xx_errata;
+
+struct power_state {
+	struct powerdomain *pwrdm;
+	u32 next_state;
+#ifdef CONFIG_SUSPEND
+	u32 saved_state;
+	u32 saved_logic_state;
+#endif
+	struct list_head node;
+};
+
+static LIST_HEAD(pwrst_list);
+
+#ifdef CONFIG_SUSPEND
+static int omap4_pm_suspend(void)
+{
+	struct power_state *pwrst;
+	int state, ret = 0;
+	u32 cpu_id = smp_processor_id();
+
+	/* Save current powerdomain state */
+	list_for_each_entry(pwrst, &pwrst_list, node) {
+		pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
+		pwrst->saved_logic_state = pwrdm_read_logic_retst(pwrst->pwrdm);
+	}
+
+	/* Set targeted power domain states by suspend */
+	list_for_each_entry(pwrst, &pwrst_list, node) {
+		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
+		pwrdm_set_logic_retst(pwrst->pwrdm, PWRDM_POWER_OFF);
+	}
+
+	/*
+	 * For MPUSS to hit power domain retention(CSWR or OSWR),
+	 * CPU0 and CPU1 power domains need to be in OFF or DORMANT state,
+	 * since CPU power domain CSWR is not supported by hardware
+	 * Only master CPU follows suspend path. All other CPUs follow
+	 * CPU hotplug path in system wide suspend. On OMAP4, CPU power
+	 * domain CSWR is not supported by hardware.
+	 * More details can be found in OMAP4430 TRM section 4.3.4.2.
+	 */
+	omap4_enter_lowpower(cpu_id, PWRDM_POWER_OFF);
+
+	/* Restore next powerdomain state */
+	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);
+		pwrdm_set_logic_retst(pwrst->pwrdm, pwrst->saved_logic_state);
+	}
+	if (ret) {
+		pr_crit("Could not enter target state in pm_suspend\n");
+		/*
+		 * OMAP4 chip PM currently works only with certain (newer)
+		 * versions of bootloaders. This is due to missing code in the
+		 * kernel to properly reset and initialize some devices.
+		 * Warn the user about the bootloader version being one of the
+		 * possible causes.
+		 * http://www.spinics.net/lists/arm-kernel/msg218641.html
+		 */
+		pr_warn("A possible cause could be an old bootloader - try u-boot >= v2012.07\n");
+	} else {
+		pr_info("Successfully put all powerdomains to target state\n");
+	}
+
+	return 0;
+}
+#else
+#define omap4_pm_suspend NULL
+#endif /* CONFIG_SUSPEND */
+
+static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
+{
+	struct power_state *pwrst;
+
+	if (!pwrdm->pwrsts)
+		return 0;
+
+	/*
+	 * Skip CPU0 and CPU1 power domains. CPU1 is programmed
+	 * through hotplug path and CPU0 explicitly programmed
+	 * further down in the code path
+	 */
+	if (!strncmp(pwrdm->name, "cpu", 3))
+		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);
+
+	return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
+}
+
+/**
+ * omap_default_idle - OMAP4 default ilde routine.'
+ *
+ * Implements OMAP4 memory, IO ordering requirements which can't be addressed
+ * with default cpu_do_idle() hook. Used by all CPUs with !CONFIG_CPU_IDLE and
+ * by secondary CPU with CONFIG_CPU_IDLE.
+ */
+static void omap_default_idle(void)
+{
+	omap_do_wfi();
+}
+
+/**
+ * omap4_init_static_deps - Add OMAP4 static dependencies
+ *
+ * Add needed static clockdomain dependencies on OMAP4 devices.
+ * Return: 0 on success or 'err' on failures
+ */
+static inline int omap4_init_static_deps(void)
+{
+	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
+	struct clockdomain *ducati_clkdm, *l3_2_clkdm;
+	int ret = 0;
+
+	if (omap_rev() == OMAP4430_REV_ES1_0) {
+		WARN(1, "Power Management not supported on OMAP4430 ES1.0\n");
+		return -ENODEV;
+	}
+
+	pr_err("Power Management for TI OMAP4.\n");
+	/*
+	 * OMAP4 chip PM currently works only with certain (newer)
+	 * versions of bootloaders. This is due to missing code in the
+	 * kernel to properly reset and initialize some devices.
+	 * http://www.spinics.net/lists/arm-kernel/msg218641.html
+	 */
+	pr_warn("OMAP4 PM: u-boot >= v2012.07 is required for full PM support\n");
+
+	ret = pwrdm_for_each(pwrdms_setup, NULL);
+	if (ret) {
+		pr_err("Failed to setup powerdomains\n");
+		return ret;
+	}
+
+	/*
+	 * The dynamic dependency between MPUSS -> MEMIF and
+	 * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
+	 * expected. The hardware recommendation is to enable static
+	 * dependencies for these to avoid system lock ups or random crashes.
+	 * The L4 wakeup depedency is added to workaround the OCP sync hardware
+	 * BUG with 32K synctimer which lead to incorrect timer value read
+	 * from the 32K counter. The BUG applies for GPTIMER1 and WDT2 which
+	 * are part of L4 wakeup clockdomain.
+	 */
+	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
+	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
+	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
+	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
+	ducati_clkdm = clkdm_lookup("ducati_clkdm");
+	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
+		(!l3_2_clkdm) || (!ducati_clkdm))
+		return -EINVAL;
+
+	ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
+	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
+	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
+	ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
+	ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
+	if (ret) {
+		pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 wakeup dependency\n");
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+/**
+ * omap4_pm_init_early - Does early initialization necessary for OMAP4+ devices
+ *
+ * Initializes basic stuff for power management functionality.
+ */
+int __init omap4_pm_init_early(void)
+{
+	if (cpu_is_omap446x())
+		pm44xx_errata |= PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD;
+
+	return 0;
+}
+
+/**
+ * omap4_pm_init - Init routine for OMAP4+ devices
+ *
+ * Initializes all powerdomain and clockdomain target states
+ * and all PRCM settings.
+ * Return: Returns the error code returned by called functions.
+ */
+int __init omap4_pm_init(void)
+{
+	int ret = 0;
+
+	if (omap_rev() == OMAP4430_REV_ES1_0) {
+		WARN(1, "Power Management not supported on OMAP4430 ES1.0\n");
+		return -ENODEV;
+	}
+
+	pr_info("Power Management for TI OMAP4+ devices.\n");
+
+	ret = pwrdm_for_each(pwrdms_setup, NULL);
+	if (ret) {
+		pr_err("Failed to setup powerdomains.\n");
+		goto err2;
+	}
+
+	if (cpu_is_omap44xx()) {
+		ret = omap4_init_static_deps();
+		if (ret)
+			goto err2;
+	}
+
+	ret = omap4_mpuss_init();
+	if (ret) {
+		pr_err("Failed to initialise OMAP4 MPUSS\n");
+		goto err2;
+	}
+
+	(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
+
+	omap_common_suspend_init(omap4_pm_suspend);
+
+	/* Overwrite the default cpu_do_idle() */
+	arm_pm_idle = omap_default_idle;
+
+	if (cpu_is_omap44xx())
+		omap4_idle_init();
+
+err2:
+	return ret;
+}