1 files changed, 156 insertions, 114 deletions

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index ed11887c1b7c..d9e13c1f9b13 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -9,9 +9,11 @@
  * Copyright (C) 2009 Texas Instruments
  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  */
+#include <linux/cleanup.h>
 #include <linux/cpu_pm.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/clk.h>
@@ -133,6 +135,7 @@
 #define GPMC_CONFIG_DEV_SIZE	0x00000002
 #define GPMC_CONFIG_DEV_TYPE	0x00000003
 
+#define GPMC_CONFIG_WAITPINPOLARITY(pin)	(BIT(pin) << 8)
 #define GPMC_CONFIG1_WRAPBURST_SUPP     (1 << 31)
 #define GPMC_CONFIG1_READMULTIPLE_SUPP  (1 << 30)
 #define GPMC_CONFIG1_READTYPE_ASYNC     (0 << 29)
@@ -228,6 +231,12 @@ struct omap3_gpmc_regs {
 	struct gpmc_cs_config cs_context[GPMC_CS_NUM];
 };
 
+struct gpmc_waitpin {
+	u32 pin;
+	u32 polarity;
+	struct gpio_desc *desc;
+};
+
 struct gpmc_device {
 	struct device *dev;
 	int irq;
@@ -235,6 +244,7 @@ struct gpmc_device {
 	struct gpio_chip gpio_chip;
 	struct notifier_block nb;
 	struct omap3_gpmc_regs context;
+	struct gpmc_waitpin *waitpins;
 	int nirqs;
 	unsigned int is_suspended:1;
 	struct resource *data;
@@ -348,17 +358,6 @@ static unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
 	return (time_ps + tick_ps - 1) / tick_ps;
 }
 
-static unsigned int gpmc_clk_ticks_to_ns(unsigned int ticks, int cs,
-					 enum gpmc_clk_domain cd)
-{
-	return ticks * gpmc_get_clk_period(cs, cd) / 1000;
-}
-
-unsigned int gpmc_ticks_to_ns(unsigned int ticks)
-{
-	return gpmc_clk_ticks_to_ns(ticks, /* any CS */ 0, GPMC_CD_FCLK);
-}
-
 static unsigned int gpmc_ticks_to_ps(unsigned int ticks)
 {
 	return ticks * gpmc_get_fclk_period();
@@ -405,6 +404,13 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
 }
 
 #ifdef CONFIG_OMAP_GPMC_DEBUG
+
+static unsigned int gpmc_clk_ticks_to_ns(unsigned int ticks, int cs,
+					 enum gpmc_clk_domain cd)
+{
+	return ticks * gpmc_get_clk_period(cs, cd) / 1000;
+}
+
 /**
  * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it.
  * @cs:      Chip Select Region
@@ -980,18 +986,18 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 	if (size > (1 << GPMC_SECTION_SHIFT))
 		return -ENOMEM;
 
-	spin_lock(&gpmc_mem_lock);
-	if (gpmc_cs_reserved(cs)) {
-		r = -EBUSY;
-		goto out;
-	}
+	guard(spinlock)(&gpmc_mem_lock);
+
+	if (gpmc_cs_reserved(cs))
+		return -EBUSY;
+
 	if (gpmc_cs_mem_enabled(cs))
 		r = adjust_resource(res, res->start & ~(size - 1), size);
 	if (r < 0)
 		r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
 				      size, NULL, NULL);
 	if (r < 0)
-		goto out;
+		return r;
 
 	/* Disable CS while changing base address and size mask */
 	gpmc_cs_disable_mem(cs);
@@ -999,16 +1005,15 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 	r = gpmc_cs_set_memconf(cs, res->start, resource_size(res));
 	if (r < 0) {
 		release_resource(res);
-		goto out;
+		return r;
 	}
 
 	/* Enable CS */
 	gpmc_cs_enable_mem(cs);
 	*base = res->start;
 	gpmc_cs_set_reserved(cs, 1);
-out:
-	spin_unlock(&gpmc_mem_lock);
-	return r;
+
+	return 0;
 }
 EXPORT_SYMBOL(gpmc_cs_request);
 
@@ -1017,10 +1022,9 @@ void gpmc_cs_free(int cs)
 	struct gpmc_cs_data *gpmc;
 	struct resource *res;
 
-	spin_lock(&gpmc_mem_lock);
+	guard(spinlock)(&gpmc_mem_lock);
 	if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) {
 		WARN(1, "Trying to free non-reserved GPMC CS%d\n", cs);
-		spin_unlock(&gpmc_mem_lock);
 		return;
 	}
 	gpmc = &gpmc_cs[cs];
@@ -1030,10 +1034,65 @@ void gpmc_cs_free(int cs)
 	if (res->flags)
 		release_resource(res);
 	gpmc_cs_set_reserved(cs, 0);
-	spin_unlock(&gpmc_mem_lock);
 }
 EXPORT_SYMBOL(gpmc_cs_free);
 
+static bool gpmc_is_valid_waitpin(u32 waitpin)
+{
+	return waitpin < gpmc_nr_waitpins;
+}
+
+static int gpmc_alloc_waitpin(struct gpmc_device *gpmc,
+			      struct gpmc_settings *p)
+{
+	int ret;
+	struct gpmc_waitpin *waitpin;
+	struct gpio_desc *waitpin_desc;
+
+	if (!gpmc_is_valid_waitpin(p->wait_pin))
+		return -EINVAL;
+
+	waitpin = &gpmc->waitpins[p->wait_pin];
+
+	if (!waitpin->desc) {
+		/* Reserve the GPIO for wait pin usage.
+		 * GPIO polarity doesn't matter here. Wait pin polarity
+		 * is set in GPMC_CONFIG register.
+		 */
+		waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
+							 p->wait_pin, "WAITPIN",
+							 GPIO_ACTIVE_HIGH,
+							 GPIOD_IN);
+
+		ret = PTR_ERR(waitpin_desc);
+		if (IS_ERR(waitpin_desc) && ret != -EBUSY)
+			return ret;
+
+		/* New wait pin */
+		waitpin->desc = waitpin_desc;
+		waitpin->pin = p->wait_pin;
+		waitpin->polarity = p->wait_pin_polarity;
+	} else {
+		/* Shared wait pin */
+		if (p->wait_pin_polarity != waitpin->polarity ||
+		    p->wait_pin != waitpin->pin) {
+			dev_err(gpmc->dev,
+				"shared-wait-pin: invalid configuration\n");
+			return -EINVAL;
+		}
+		dev_info(gpmc->dev, "shared wait-pin: %d\n", waitpin->pin);
+	}
+
+	return 0;
+}
+
+static void gpmc_free_waitpin(struct gpmc_device *gpmc,
+			      int wait_pin)
+{
+	if (gpmc_is_valid_waitpin(wait_pin))
+		gpiochip_free_own_desc(gpmc->waitpins[wait_pin].desc);
+}
+
 /**
  * gpmc_configure - write request to configure gpmc
  * @cmd: command type
@@ -1232,21 +1291,6 @@ int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
 }
 EXPORT_SYMBOL_GPL(gpmc_omap_onenand_set_timings);
 
-int gpmc_get_client_irq(unsigned int irq_config)
-{
-	if (!gpmc_irq_domain) {
-		pr_warn("%s called before GPMC IRQ domain available\n",
-			__func__);
-		return 0;
-	}
-
-	/* we restrict this to NAND IRQs only */
-	if (irq_config >= GPMC_NR_NAND_IRQS)
-		return 0;
-
-	return irq_create_mapping(gpmc_irq_domain, irq_config);
-}
-
 static int gpmc_irq_endis(unsigned long hwirq, bool endis)
 {
 	u32 regval;
@@ -1411,10 +1455,8 @@ static int gpmc_setup_irq(struct gpmc_device *gpmc)
 	gpmc->irq_chip.irq_unmask = gpmc_irq_unmask;
 	gpmc->irq_chip.irq_set_type = gpmc_irq_set_type;
 
-	gpmc_irq_domain = irq_domain_add_linear(gpmc->dev->of_node,
-						gpmc->nirqs,
-						&gpmc_irq_domain_ops,
-						gpmc);
+	gpmc_irq_domain = irq_domain_create_linear(dev_fwnode(gpmc->dev), gpmc->nirqs,
+						   &gpmc_irq_domain_ops, gpmc);
 	if (!gpmc_irq_domain) {
 		dev_err(gpmc->dev, "IRQ domain add failed\n");
 		return -ENODEV;
@@ -1853,7 +1895,8 @@ int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
 		}
 	}
 
-	if (p->wait_pin > gpmc_nr_waitpins) {
+	if (p->wait_pin != GPMC_WAITPIN_INVALID &&
+	    p->wait_pin > gpmc_nr_waitpins) {
 		pr_err("%s: invalid wait-pin (%d)\n", __func__, p->wait_pin);
 		return -EINVAL;
 	}
@@ -1885,20 +1928,21 @@ int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
 
 	gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, config1);
 
+	if (p->wait_pin_polarity != GPMC_WAITPINPOLARITY_INVALID) {
+		config1 = gpmc_read_reg(GPMC_CONFIG);
+
+		if (p->wait_pin_polarity == GPMC_WAITPINPOLARITY_ACTIVE_LOW)
+			config1 &= ~GPMC_CONFIG_WAITPINPOLARITY(p->wait_pin);
+		else if (p->wait_pin_polarity == GPMC_WAITPINPOLARITY_ACTIVE_HIGH)
+			config1 |= GPMC_CONFIG_WAITPINPOLARITY(p->wait_pin);
+
+		gpmc_write_reg(GPMC_CONFIG, config1);
+	}
+
 	return 0;
 }
 
 #ifdef CONFIG_OF
-static const struct of_device_id gpmc_dt_ids[] = {
-	{ .compatible = "ti,omap2420-gpmc" },
-	{ .compatible = "ti,omap2430-gpmc" },
-	{ .compatible = "ti,omap3430-gpmc" },	/* omap3430 & omap3630 */
-	{ .compatible = "ti,omap4430-gpmc" },	/* omap4430 & omap4460 & omap543x */
-	{ .compatible = "ti,am3352-gpmc" },	/* am335x devices */
-	{ .compatible = "ti,am64-gpmc" },
-	{ }
-};
-
 static void gpmc_cs_set_name(int cs, const char *name)
 {
 	struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
@@ -1984,7 +2028,25 @@ void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
 				__func__);
 	}
 
+	p->wait_pin = GPMC_WAITPIN_INVALID;
+	p->wait_pin_polarity = GPMC_WAITPINPOLARITY_INVALID;
+
 	if (!of_property_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) {
+		if (!gpmc_is_valid_waitpin(p->wait_pin)) {
+			pr_err("%s: Invalid wait-pin (%d)\n", __func__, p->wait_pin);
+			p->wait_pin = GPMC_WAITPIN_INVALID;
+		}
+
+		if (!of_property_read_u32(np, "ti,wait-pin-polarity",
+					  &p->wait_pin_polarity)) {
+			if (p->wait_pin_polarity != GPMC_WAITPINPOLARITY_ACTIVE_HIGH &&
+			    p->wait_pin_polarity != GPMC_WAITPINPOLARITY_ACTIVE_LOW) {
+				pr_err("%s: Invalid wait-pin-polarity (%d)\n",
+				       __func__, p->wait_pin_polarity);
+				p->wait_pin_polarity = GPMC_WAITPINPOLARITY_INVALID;
+				}
+		}
+
 		p->wait_on_read = of_property_read_bool(np,
 							"gpmc,wait-on-read");
 		p->wait_on_write = of_property_read_bool(np,
@@ -2089,7 +2151,6 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
 	const char *name;
 	int ret, cs;
 	u32 val;
-	struct gpio_desc *waitpin_desc = NULL;
 	struct gpmc_device *gpmc = platform_get_drvdata(pdev);
 
 	if (of_property_read_u32(child, "reg", &cs) < 0) {
@@ -2163,26 +2224,6 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
 		goto err;
 	}
 
-	if (of_node_name_eq(child, "nand")) {
-		/* Warn about older DT blobs with no compatible property */
-		if (!of_property_read_bool(child, "compatible")) {
-			dev_warn(&pdev->dev,
-				 "Incompatible NAND node: missing compatible");
-			ret = -EINVAL;
-			goto err;
-		}
-	}
-
-	if (of_node_name_eq(child, "onenand")) {
-		/* Warn about older DT blobs with no compatible property */
-		if (!of_property_read_bool(child, "compatible")) {
-			dev_warn(&pdev->dev,
-				 "Incompatible OneNAND node: missing compatible");
-			ret = -EINVAL;
-			goto err;
-		}
-	}
-
 	if (of_match_node(omap_nand_ids, child)) {
 		/* NAND specific setup */
 		val = 8;
@@ -2217,17 +2258,9 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
 
 	/* Reserve wait pin if it is required and valid */
 	if (gpmc_s.wait_on_read || gpmc_s.wait_on_write) {
-		unsigned int wait_pin = gpmc_s.wait_pin;
-
-		waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
-							 wait_pin, "WAITPIN",
-							 GPIO_ACTIVE_HIGH,
-							 GPIOD_IN);
-		if (IS_ERR(waitpin_desc)) {
-			dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
-			ret = PTR_ERR(waitpin_desc);
+		ret = gpmc_alloc_waitpin(gpmc, &gpmc_s);
+		if (ret < 0)
 			goto err;
-		}
 	}
 
 	gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings");
@@ -2257,11 +2290,9 @@ no_timings:
 	if (!of_platform_device_create(child, NULL, &pdev->dev))
 		goto err_child_fail;
 
-	/* is child a common bus? */
-	if (of_match_node(of_default_bus_match_table, child))
-		/* create children and other common bus children */
-		if (of_platform_default_populate(child, NULL, &pdev->dev))
-			goto err_child_fail;
+	/* create children and other common bus children */
+	if (of_platform_default_populate(child, NULL, &pdev->dev))
+		goto err_child_fail;
 
 	return 0;
 
@@ -2271,13 +2302,15 @@ err_child_fail:
 	ret = -ENODEV;
 
 err_cs:
-	gpiochip_free_own_desc(waitpin_desc);
+	gpmc_free_waitpin(gpmc, gpmc_s.wait_pin);
 err:
 	gpmc_cs_free(cs);
 
 	return ret;
 }
 
+static const struct of_device_id gpmc_dt_ids[];
+
 static int gpmc_probe_dt(struct platform_device *pdev)
 {
 	int ret;
@@ -2341,7 +2374,7 @@ static void gpmc_probe_dt_children(struct platform_device *pdev)
 
 static int gpmc_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
 {
-	return 1;	/* we're input only */
+	return GPIO_LINE_DIRECTION_IN; /* we're input only */
 }
 
 static int gpmc_gpio_direction_input(struct gpio_chip *chip,
@@ -2350,17 +2383,6 @@ static int gpmc_gpio_direction_input(struct gpio_chip *chip,
 	return 0;	/* we're input only */
 }
 
-static int gpmc_gpio_direction_output(struct gpio_chip *chip,
-				      unsigned int offset, int value)
-{
-	return -EINVAL;	/* we're input only */
-}
-
-static void gpmc_gpio_set(struct gpio_chip *chip, unsigned int offset,
-			  int value)
-{
-}
-
 static int gpmc_gpio_get(struct gpio_chip *chip, unsigned int offset)
 {
 	u32 reg;
@@ -2382,8 +2404,6 @@ static int gpmc_gpio_init(struct gpmc_device *gpmc)
 	gpmc->gpio_chip.ngpio = gpmc_nr_waitpins;
 	gpmc->gpio_chip.get_direction = gpmc_gpio_get_direction;
 	gpmc->gpio_chip.direction_input = gpmc_gpio_direction_input;
-	gpmc->gpio_chip.direction_output = gpmc_gpio_direction_output;
-	gpmc->gpio_chip.set = gpmc_gpio_set;
 	gpmc->gpio_chip.get = gpmc_gpio_get;
 	gpmc->gpio_chip.base = -1;
 
@@ -2498,7 +2518,7 @@ static int omap_gpmc_context_notifier(struct notifier_block *nb,
 
 static int gpmc_probe(struct platform_device *pdev)
 {
-	int rc;
+	int rc, i;
 	u32 l;
 	struct resource *res;
 	struct gpmc_device *gpmc;
@@ -2554,6 +2574,15 @@ static int gpmc_probe(struct platform_device *pdev)
 		gpmc_nr_waitpins = GPMC_NR_WAITPINS;
 	}
 
+	gpmc->waitpins = devm_kzalloc(&pdev->dev,
+				      gpmc_nr_waitpins * sizeof(struct gpmc_waitpin),
+				      GFP_KERNEL);
+	if (!gpmc->waitpins)
+		return -ENOMEM;
+
+	for (i = 0; i < gpmc_nr_waitpins; i++)
+		gpmc->waitpins[i].pin = GPMC_WAITPIN_INVALID;
+
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
 
@@ -2605,17 +2634,18 @@ gpio_init_failed:
 	return rc;
 }
 
-static int gpmc_remove(struct platform_device *pdev)
+static void gpmc_remove(struct platform_device *pdev)
 {
+	int i;
 	struct gpmc_device *gpmc = platform_get_drvdata(pdev);
 
 	cpu_pm_unregister_notifier(&gpmc->nb);
+	for (i = 0; i < gpmc_nr_waitpins; i++)
+		gpmc_free_waitpin(gpmc, i);
 	gpmc_free_irq(gpmc);
 	gpmc_mem_exit();
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -2644,6 +2674,19 @@ static int gpmc_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);
 
+#ifdef CONFIG_OF
+static const struct of_device_id gpmc_dt_ids[] = {
+	{ .compatible = "ti,omap2420-gpmc" },
+	{ .compatible = "ti,omap2430-gpmc" },
+	{ .compatible = "ti,omap3430-gpmc" },	/* omap3430 & omap3630 */
+	{ .compatible = "ti,omap4430-gpmc" },	/* omap4430 & omap4460 & omap543x */
+	{ .compatible = "ti,am3352-gpmc" },	/* am335x devices */
+	{ .compatible = "ti,am64-gpmc" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
+#endif
+
 static struct platform_driver gpmc_driver = {
 	.probe		= gpmc_probe,
 	.remove		= gpmc_remove,
@@ -2654,8 +2697,7 @@ static struct platform_driver gpmc_driver = {
 	},
 };
 
-static __init int gpmc_init(void)
-{
-	return platform_driver_register(&gpmc_driver);
-}
-postcore_initcall(gpmc_init);
+module_platform_driver(gpmc_driver);
+
+MODULE_DESCRIPTION("Texas Instruments GPMC driver");
+MODULE_LICENSE("GPL");