Merge branch 'ib-omap' into devel

arch/arm/mach-omap2/pm24xx.c

···
  * published by the Free Software Foundation.
  */
 
+#include <linux/cpu_pm.h>
 #include <linux/suspend.h>
 #include <linux/sched.h>
 #include <linux/proc_fs.h>
···
 #include <linux/clk-provider.h>
 #include <linux/irq.h>
 #include <linux/time.h>
-#include <linux/gpio.h>
-#include <linux/platform_data/gpio-omap.h>
 
 #include <asm/fncpy.h>
 
···
 	l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
 	omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
 
-	omap2_gpio_prepare_for_idle(0);
+	cpu_cluster_pm_enter();
 
 	/* One last check for pending IRQs to avoid extra latency due
 	 * to sleeping unnecessarily. */
···
 			   OMAP_SDRC_REGADDR(SDRC_POWER));
 
 no_sleep:
-	omap2_gpio_resume_after_idle();
+	cpu_cluster_pm_exit();
 
 	clk_enable(osc_ck);
 

arch/arm/mach-omap2/pm34xx.c

···
  * published by the Free Software Foundation.
  */
 
+#include <linux/cpu_pm.h>
 #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>
 
···
 	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;
 	u32 sdrc_pwr = 0;
 
 	mpu_next_state = pwrdm_read_next_pwrst(mpu_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);
-	}
+	if (per_next_state == PWRDM_POWER_OFF)
+		cpu_cluster_pm_enter();
 
 	/* CORE */
 	if (core_next_state < PWRDM_POWER_ON) {
···
 	pwrdm_post_transition(NULL);
 
 	/* PER */
-	if (per_next_state < PWRDM_POWER_ON)
-		omap2_gpio_resume_after_idle();
+	if (per_next_state == PWRDM_POWER_OFF)
+		cpu_cluster_pm_exit();
 }
 
 static void omap3_pm_idle(void)

drivers/gpio/gpio-omap.c

···
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/cpu_pm.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm.h>
···
 #include <linux/bitops.h>
 #include <linux/platform_data/gpio-omap.h>
 
-#define OFF_MODE	1
 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
+
+#define OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER	BIT(2)
+#define OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN	BIT(1)
 
 static LIST_HEAD(omap_gpio_list);
 
···
 	u32 debounce_en;
 };
 
+struct gpio_bank;
+
+struct gpio_omap_funcs {
+	void (*idle_enable_level_quirk)(struct gpio_bank *bank);
+	void (*idle_disable_level_quirk)(struct gpio_bank *bank);
+};
+
 struct gpio_bank {
 	struct list_head node;
 	void __iomem *base;
···
 	u32 non_wakeup_gpios;
 	u32 enabled_non_wakeup_gpios;
 	struct gpio_regs context;
+	struct gpio_omap_funcs funcs;
 	u32 saved_datain;
 	u32 level_mask;
 	u32 toggle_mask;
···
 	raw_spinlock_t wa_lock;
 	struct gpio_chip chip;
 	struct clk *dbck;
+	struct notifier_block nb;
+	unsigned int is_suspended:1;
 	u32 mod_usage;
 	u32 irq_usage;
 	u32 dbck_enable_mask;
···
 	int stride;
 	u32 width;
 	int context_loss_count;
-	int power_mode;
 	bool workaround_enabled;
+	u32 quirks;
 
 	void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
 	void (*set_dataout_multiple)(struct gpio_bank *bank,
···
 			readl_relaxed(bank->base + bank->regs->fallingdetect);
 
 	if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
-		omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
-		bank->context.wake_en =
-			readl_relaxed(bank->base + bank->regs->wkup_en);
+		/* Defer wkup_en register update until we idle? */
+		if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
+			if (trigger)
+				bank->context.wake_en |= gpio_bit;
+			else
+				bank->context.wake_en &= ~gpio_bit;
+		} else {
+			omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit,
+				      trigger != 0);
+			bank->context.wake_en =
+				readl_relaxed(bank->base + bank->regs->wkup_en);
+		}
 	}
 
 	/* This part needs to be executed always for OMAP{34xx, 44xx} */
···
 	if (WARN_ON(!isr_reg))
 		goto exit;
 
-	pm_runtime_get_sync(bank->chip.parent);
+	if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
+		      "gpio irq%i while runtime suspended?\n", irq))
+		return IRQ_NONE;
 
 	while (1) {
 		raw_spin_lock_irqsave(&bank->lock, lock_flags);
···
 		}
 	}
 exit:
-	pm_runtime_put(bank->chip.parent);
 	return IRQ_HANDLED;
 }
 
···
 
 	omap_set_gpio_irqenable(bank, offset, 1);
 	raw_spin_unlock_irqrestore(&bank->lock, flags);
+}
+
+/*
+ * Only edges can generate a wakeup event to the PRCM.
+ *
+ * Therefore, ensure any wake-up capable GPIOs have
+ * edge-detection enabled before going idle to ensure a wakeup
+ * to the PRCM is generated on a GPIO transition. (c.f. 34xx
+ * NDA TRM 25.5.3.1)
+ *
+ * The normal values will be restored upon ->runtime_resume()
+ * by writing back the values saved in bank->context.
+ */
+static void __maybe_unused
+omap2_gpio_enable_level_quirk(struct gpio_bank *bank)
+{
+	u32 wake_low, wake_hi;
+
+	/* Enable additional edge detection for level gpios for idle */
+	wake_low = bank->context.leveldetect0 & bank->context.wake_en;
+	if (wake_low)
+		writel_relaxed(wake_low | bank->context.fallingdetect,
+			       bank->base + bank->regs->fallingdetect);
+
+	wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
+	if (wake_hi)
+		writel_relaxed(wake_hi | bank->context.risingdetect,
+			       bank->base + bank->regs->risingdetect);
+}
+
+static void __maybe_unused
+omap2_gpio_disable_level_quirk(struct gpio_bank *bank)
+{
+	/* Disable edge detection for level gpios after idle */
+	writel_relaxed(bank->context.fallingdetect,
+		       bank->base + bank->regs->fallingdetect);
+	writel_relaxed(bank->context.risingdetect,
+		       bank->base + bank->regs->risingdetect);
+}
+
+/*
+ * On omap4 and later SoC variants a level interrupt with wkup_en
+ * enabled blocks the GPIO functional clock from idling until the GPIO
+ * instance has been reset. To avoid that, we must set wkup_en only for
+ * idle for level interrupts, and clear level registers for the duration
+ * of idle. The level interrupts will be still there on wakeup by their
+ * nature.
+ */
+static void __maybe_unused
+omap4_gpio_enable_level_quirk(struct gpio_bank *bank)
+{
+	/* Update wake register for idle, edge bits might be already set */
+	writel_relaxed(bank->context.wake_en,
+		       bank->base + bank->regs->wkup_en);
+
+	/* Clear level registers for idle */
+	writel_relaxed(0, bank->base + bank->regs->leveldetect0);
+	writel_relaxed(0, bank->base + bank->regs->leveldetect1);
+}
+
+static void __maybe_unused
+omap4_gpio_disable_level_quirk(struct gpio_bank *bank)
+{
+	/* Restore level registers after idle */
+	writel_relaxed(bank->context.leveldetect0,
+		       bank->base + bank->regs->leveldetect0);
+	writel_relaxed(bank->context.leveldetect1,
+		       bank->base + bank->regs->leveldetect1);
+
+	/* Clear saved wkup_en for level, it will be set for next idle again */
+	bank->context.wake_en &= ~(bank->context.leveldetect0 |
+				   bank->context.leveldetect1);
+
+	/* Update wake with only edge configuration */
+	writel_relaxed(bank->context.wake_en,
+		       bank->base + bank->regs->wkup_en);
 }
 
 /*---------------------------------------------------------------------*/
···
 	return ret;
 }
 
+static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context);
+static void omap_gpio_unidle(struct gpio_bank *bank);
+
+static int gpio_omap_cpu_notifier(struct notifier_block *nb,
+				  unsigned long cmd, void *v)
+{
+	struct gpio_bank *bank;
+	struct device *dev;
+	unsigned long flags;
+
+	bank = container_of(nb, struct gpio_bank, nb);
+	dev = bank->chip.parent;
+
+	raw_spin_lock_irqsave(&bank->lock, flags);
+	switch (cmd) {
+	case CPU_CLUSTER_PM_ENTER:
+		if (bank->is_suspended)
+			break;
+		omap_gpio_idle(bank, true);
+		break;
+	case CPU_CLUSTER_PM_ENTER_FAILED:
+	case CPU_CLUSTER_PM_EXIT:
+		if (bank->is_suspended)
+			break;
+		omap_gpio_unidle(bank);
+		break;
+	}
+	raw_spin_unlock_irqrestore(&bank->lock, flags);
+
+	return NOTIFY_OK;
+}
+
 static const struct of_device_id omap_gpio_match[];
 
 static int omap_gpio_probe(struct platform_device *pdev)
···
 	bank->chip.parent = dev;
 	bank->chip.owner = THIS_MODULE;
 	bank->dbck_flag = pdata->dbck_flag;
+	bank->quirks = pdata->quirks;
 	bank->stride = pdata->bank_stride;
 	bank->width = pdata->bank_width;
 	bank->is_mpuio = pdata->is_mpuio;
···
 #ifdef CONFIG_OF_GPIO
 	bank->chip.of_node = of_node_get(node);
 #endif
+
 	if (node) {
 		if (!of_property_read_bool(node, "ti,gpio-always-on"))
 			bank->loses_context = true;
···
 		bank->set_dataout = omap_set_gpio_dataout_mask;
 		bank->set_dataout_multiple =
 				omap_set_gpio_dataout_mask_multiple;
+	}
+
+	if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
+		bank->funcs.idle_enable_level_quirk =
+			omap4_gpio_enable_level_quirk;
+		bank->funcs.idle_disable_level_quirk =
+			omap4_gpio_disable_level_quirk;
+	} else if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) {
+		bank->funcs.idle_enable_level_quirk =
+			omap2_gpio_enable_level_quirk;
+		bank->funcs.idle_disable_level_quirk =
+			omap2_gpio_disable_level_quirk;
 	}
 
 	raw_spin_lock_init(&bank->lock);
···
 	platform_set_drvdata(pdev, bank);
 
 	pm_runtime_enable(dev);
-	pm_runtime_irq_safe(dev);
 	pm_runtime_get_sync(dev);
 
 	if (bank->is_mpuio)
···
 
 	omap_gpio_show_rev(bank);
 
+	if (bank->funcs.idle_enable_level_quirk &&
+	    bank->funcs.idle_disable_level_quirk) {
+		bank->nb.notifier_call = gpio_omap_cpu_notifier;
+		cpu_pm_register_notifier(&bank->nb);
+	}
+
 	pm_runtime_put(dev);
 
 	list_add_tail(&bank->node, &omap_gpio_list);
···
 {
 	struct gpio_bank *bank = platform_get_drvdata(pdev);
 
+	if (bank->nb.notifier_call)
+		cpu_pm_unregister_notifier(&bank->nb);
 	list_del(&bank->node);
 	gpiochip_remove(&bank->chip);
 	pm_runtime_disable(&pdev->dev);
···
 	return 0;
 }
 
-#ifdef CONFIG_ARCH_OMAP2PLUS
-
-#if defined(CONFIG_PM)
 static void omap_gpio_restore_context(struct gpio_bank *bank);
 
-static int omap_gpio_runtime_suspend(struct device *dev)
+static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct gpio_bank *bank = platform_get_drvdata(pdev);
+	struct device *dev = bank->chip.parent;
 	u32 l1 = 0, l2 = 0;
-	unsigned long flags;
-	u32 wake_low, wake_hi;
 
-	raw_spin_lock_irqsave(&bank->lock, flags);
-
-	/*
-	 * Only edges can generate a wakeup event to the PRCM.
-	 *
-	 * Therefore, ensure any wake-up capable GPIOs have
-	 * edge-detection enabled before going idle to ensure a wakeup
-	 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
-	 * NDA TRM 25.5.3.1)
-	 *
-	 * The normal values will be restored upon ->runtime_resume()
-	 * by writing back the values saved in bank->context.
-	 */
-	wake_low = bank->context.leveldetect0 & bank->context.wake_en;
-	if (wake_low)
-		writel_relaxed(wake_low | bank->context.fallingdetect,
-			     bank->base + bank->regs->fallingdetect);
-	wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
-	if (wake_hi)
-		writel_relaxed(wake_hi | bank->context.risingdetect,
-			     bank->base + bank->regs->risingdetect);
+	if (bank->funcs.idle_enable_level_quirk)
+		bank->funcs.idle_enable_level_quirk(bank);
 
 	if (!bank->enabled_non_wakeup_gpios)
 		goto update_gpio_context_count;
 
-	if (bank->power_mode != OFF_MODE) {
-		bank->power_mode = 0;
+	if (!may_lose_context)
 		goto update_gpio_context_count;
-	}
+
 	/*
 	 * If going to OFF, remove triggering for all
 	 * non-wakeup GPIOs.  Otherwise spurious IRQs will be
···
 				bank->get_context_loss_count(dev);
 
 	omap_gpio_dbck_disable(bank);
-	raw_spin_unlock_irqrestore(&bank->lock, flags);
-
-	return 0;
 }
 
 static void omap_gpio_init_context(struct gpio_bank *p);
 
-static int omap_gpio_runtime_resume(struct device *dev)
+static void omap_gpio_unidle(struct gpio_bank *bank)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct gpio_bank *bank = platform_get_drvdata(pdev);
+	struct device *dev = bank->chip.parent;
 	u32 l = 0, gen, gen0, gen1;
-	unsigned long flags;
 	int c;
-
-	raw_spin_lock_irqsave(&bank->lock, flags);
 
 	/*
 	 * On the first resume during the probe, the context has not
···
 
 	omap_gpio_dbck_enable(bank);
 
-	/*
-	 * In ->runtime_suspend(), level-triggered, wakeup-enabled
-	 * GPIOs were set to edge trigger also in order to be able to
-	 * generate a PRCM wakeup.  Here we restore the
-	 * pre-runtime_suspend() values for edge triggering.
-	 */
-	writel_relaxed(bank->context.fallingdetect,
-		     bank->base + bank->regs->fallingdetect);
-	writel_relaxed(bank->context.risingdetect,
-		     bank->base + bank->regs->risingdetect);
+	if (bank->funcs.idle_disable_level_quirk)
+		bank->funcs.idle_disable_level_quirk(bank);
 
 	if (bank->loses_context) {
 		if (!bank->get_context_loss_count) {
···
 			if (c != bank->context_loss_count) {
 				omap_gpio_restore_context(bank);
 			} else {
-				raw_spin_unlock_irqrestore(&bank->lock, flags);
-				return 0;
+				return;
 			}
 		}
 	}
 
-	if (!bank->workaround_enabled) {
-		raw_spin_unlock_irqrestore(&bank->lock, flags);
-		return 0;
-	}
+	if (!bank->workaround_enabled)
+		return;
 
 	l = readl_relaxed(bank->base + bank->regs->datain);
 
···
 	}
 
 	bank->workaround_enabled = false;
-	raw_spin_unlock_irqrestore(&bank->lock, flags);
-
-	return 0;
-}
-#endif /* CONFIG_PM */
-
-#if IS_BUILTIN(CONFIG_GPIO_OMAP)
-void omap2_gpio_prepare_for_idle(int pwr_mode)
-{
-	struct gpio_bank *bank;
-
-	list_for_each_entry(bank, &omap_gpio_list, node) {
-		if (!BANK_USED(bank) || !bank->loses_context)
-			continue;
-
-		bank->power_mode = pwr_mode;
-
-		pm_runtime_put_sync_suspend(bank->chip.parent);
-	}
 }
 
-void omap2_gpio_resume_after_idle(void)
-{
-	struct gpio_bank *bank;
-
-	list_for_each_entry(bank, &omap_gpio_list, node) {
-		if (!BANK_USED(bank) || !bank->loses_context)
-			continue;
-
-		pm_runtime_get_sync(bank->chip.parent);
-	}
-}
-#endif
-
-#if defined(CONFIG_PM)
 static void omap_gpio_init_context(struct gpio_bank *p)
 {
 	struct omap_gpio_reg_offs *regs = p->regs;
···
 	writel_relaxed(bank->context.irqenable2,
 				bank->base + bank->regs->irqenable2);
 }
-#endif /* CONFIG_PM */
-#else
-#define omap_gpio_runtime_suspend NULL
-#define omap_gpio_runtime_resume NULL
-static inline void omap_gpio_init_context(struct gpio_bank *p) {}
-#endif
 
+static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = platform_get_drvdata(pdev);
+	unsigned long flags;
+	int error = 0;
+
+	raw_spin_lock_irqsave(&bank->lock, flags);
+	/* Must be idled only by CPU_CLUSTER_PM_ENTER? */
+	if (bank->irq_usage) {
+		error = -EBUSY;
+		goto unlock;
+	}
+	omap_gpio_idle(bank, true);
+	bank->is_suspended = true;
+unlock:
+	raw_spin_unlock_irqrestore(&bank->lock, flags);
+
+	return error;
+}
+
+static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = platform_get_drvdata(pdev);
+	unsigned long flags;
+	int error = 0;
+
+	raw_spin_lock_irqsave(&bank->lock, flags);
+	/* Must be unidled only by CPU_CLUSTER_PM_ENTER? */
+	if (bank->irq_usage) {
+		error = -EBUSY;
+		goto unlock;
+	}
+	omap_gpio_unidle(bank);
+	bank->is_suspended = false;
+unlock:
+	raw_spin_unlock_irqrestore(&bank->lock, flags);
+
+	return error;
+}
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
 static const struct dev_pm_ops gpio_pm_ops = {
 	SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
 									NULL)
 };
+#else
+static const struct dev_pm_ops gpio_pm_ops;
+#endif	/* CONFIG_ARCH_OMAP2PLUS */
 
 #if defined(CONFIG_OF)
 static struct omap_gpio_reg_offs omap2_gpio_regs = {
···
 	.fallingdetect =	OMAP4_GPIO_FALLINGDETECT,
 };
 
+/*
+ * Note that omap2 does not currently support idle modes with context loss so
+ * no need to add OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER quirk flag to save
+ * and restore context.
+ */
 static const struct omap_gpio_platform_data omap2_pdata = {
 	.regs = &omap2_gpio_regs,
 	.bank_width = 32,
···
 	.regs = &omap2_gpio_regs,
 	.bank_width = 32,
 	.dbck_flag = true,
+	.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER,
 };
 
 static const struct omap_gpio_platform_data omap4_pdata = {
 	.regs = &omap4_gpio_regs,
 	.bank_width = 32,
 	.dbck_flag = true,
+	.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER |
+		  OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN,
 };
 
 static const struct of_device_id omap_gpio_match[] = {

include/linux/platform_data/gpio-omap.h

···
 	bool is_mpuio;		/* whether the bank is of type MPUIO */
 	u32 non_wakeup_gpios;
 
+	u32 quirks;		/* Version specific quirks mask */
+
 	struct omap_gpio_reg_offs *regs;
 
 	/* Return context loss count due to PM states changing */
 	int (*get_context_loss_count)(struct device *dev);
 };
-
-#if IS_BUILTIN(CONFIG_GPIO_OMAP)
-extern void omap2_gpio_prepare_for_idle(int off_mode);
-extern void omap2_gpio_resume_after_idle(void);
-#else
-static inline void omap2_gpio_prepare_for_idle(int off_mode)
-{
-}
-
-static inline void omap2_gpio_resume_after_idle(void)
-{
-}
-#endif
 
 #endif