1 files changed, 96 insertions, 96 deletions

diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index c264ef7219c..0dda6cf8b85 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -1,7 +1,7 @@
 /*
- * OMAP4 Power Management Routines
+ * OMAP4+ Power Management Routines
  *
- * Copyright (C) 2010-2011 Texas Instruments, Inc.
+ * Copyright (C) 2010-2013 Texas Instruments, Inc.
  * Rajendra Nayak <rnayak@ti.com>
  * Santosh Shilimkar <santosh.shilimkar@ti.com>
  *
@@ -16,12 +16,16 @@
 #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;
@@ -68,74 +72,34 @@ static int omap4_pm_suspend(void)
 	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);
+			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)
+	if (ret) {
 		pr_crit("Could not enter target state in pm_suspend\n");
-	else
+		/*
+		 * 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;
-}
-
-static int omap4_pm_enter(suspend_state_t suspend_state)
-{
-	int ret = 0;
-
-	switch (suspend_state) {
-	case PM_SUSPEND_STANDBY:
-	case PM_SUSPEND_MEM:
-		ret = omap4_pm_suspend();
-		break;
-	default:
-		ret = -EINVAL;
 	}
 
-	return ret;
-}
-
-static int omap4_pm_begin(suspend_state_t state)
-{
-	disable_hlt();
 	return 0;
 }
-
-static void omap4_pm_end(void)
-{
-	enable_hlt();
-	return;
-}
-
-static const struct platform_suspend_ops omap_pm_ops = {
-	.begin		= omap4_pm_begin,
-	.end		= omap4_pm_end,
-	.enter		= omap4_pm_enter,
-	.valid		= suspend_valid_only_mem,
-};
+#else
+#define omap4_pm_suspend NULL
 #endif /* CONFIG_SUSPEND */
 
-/*
- * Enable hardware supervised mode for all clockdomains if it's
- * supported. Initiate sleep transition for other clockdomains, if
- * they are not used
- */
-static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
-{
-	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
-		clkdm_allow_idle(clkdm);
-	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
-			atomic_read(&clkdm->usecount) == 0)
-		clkdm_sleep(clkdm);
-	return 0;
-}
-
-
 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 {
 	struct power_state *pwrst;
@@ -151,13 +115,6 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 	if (!strncmp(pwrdm->name, "cpu", 3))
 		return 0;
 
-	/*
-	 * FIXME: Remove this check when core retention is supported
-	 * Only MPUSS power domain is added in the list.
-	 */
-	if (strcmp(pwrdm->name, "mpu_pwrdm"))
-		return 0;
-
 	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
 	if (!pwrst)
 		return -ENOMEM;
@@ -173,34 +130,25 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
  * omap_default_idle - OMAP4 default ilde routine.'
  *
  * Implements OMAP4 memory, IO ordering requirements which can't be addressed
- * with default arch_idle() hook. Used by all CPUs with !CONFIG_CPUIDLE and
- * by secondary CPU with CONFIG_CPUIDLE.
+ * 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)
 {
-	local_irq_disable();
-	local_fiq_disable();
-
 	omap_do_wfi();
-
-	local_fiq_enable();
-	local_irq_enable();
 }
 
 /**
- * omap4_pm_init - Init routine for OMAP4 PM
+ * omap4_init_static_deps - Add OMAP4 static dependencies
  *
- * Initializes all powerdomain and clockdomain target states
- * and all PRCM settings.
+ * Add needed static clockdomain dependencies on OMAP4 devices.
+ * Return: 0 on success or 'err' on failures
  */
-static int __init omap4_pm_init(void)
+static inline int omap4_init_static_deps(void)
 {
-	int ret;
 	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
-	struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;
-
-	if (!cpu_is_omap44xx())
-		return -ENODEV;
+	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");
@@ -208,11 +156,18 @@ static int __init omap4_pm_init(void)
 	}
 
 	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");
-		goto err2;
+		return ret;
 	}
 
 	/*
@@ -220,47 +175,92 @@ static int __init omap4_pm_init(void)
 	 * 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");
-	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
 	ducati_clkdm = clkdm_lookup("ducati_clkdm");
 	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
-		(!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
-		goto err2;
+		(!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(mpuss_clkdm, l4_per_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");
+		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(clkdms_setup, NULL);
+	(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
 
-#ifdef CONFIG_SUSPEND
-	suspend_set_ops(&omap_pm_ops);
-#endif /* CONFIG_SUSPEND */
+	omap_common_suspend_init(omap4_pm_suspend);
 
-	/* Overwrite the default arch_idle() */
-	pm_idle = omap_default_idle;
+	/* Overwrite the default cpu_do_idle() */
+	arm_pm_idle = omap_default_idle;
 
-	omap4_idle_init();
+	if (cpu_is_omap44xx())
+		omap4_idle_init();
 
 err2:
 	return ret;
 }
-late_initcall(omap4_pm_init);