memory: omap-gpmc: Support general purpose input for WAITPINs

[cascardo/linux.git] / drivers / memory / omap-gpmc.c

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index bfe4e87..4dd1c65 100644 (file)
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -21,6 +21,7 @@
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/platform_device.h>
@@ -237,6 +238,7 @@ struct gpmc_device {
        struct device *dev;
        int irq;
        struct irq_chip irq_chip;
+       struct gpio_chip gpio_chip;
 };
 
 static struct irq_domain *gpmc_irq_domain;
@@ -2064,10 +2066,71 @@ err:
        return ret;
 }
 
+static int gpmc_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+       return 1;       /* we're input only */
+}
+
+static int gpmc_gpio_direction_input(struct gpio_chip *chip,
+                                    unsigned int offset)
+{
+       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;
+
+       offset += 8;
+
+       reg = gpmc_read_reg(GPMC_STATUS) & BIT(offset);
+
+       return !!reg;
+}
+
+static int gpmc_gpio_init(struct gpmc_device *gpmc)
+{
+       int ret;
+
+       gpmc->gpio_chip.parent = gpmc->dev;
+       gpmc->gpio_chip.owner = THIS_MODULE;
+       gpmc->gpio_chip.label = DEVICE_NAME;
+       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;
+
+       ret = gpiochip_add(&gpmc->gpio_chip);
+       if (ret < 0) {
+               dev_err(gpmc->dev, "could not register gpio chip: %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static void gpmc_gpio_exit(struct gpmc_device *gpmc)
+{
+       gpiochip_remove(&gpmc->gpio_chip);
+}
+
 static int gpmc_probe_dt(struct platform_device *pdev)
 {
        int ret;
-       struct device_node *child;
        const struct of_device_id *of_id =
                of_match_device(gpmc_dt_ids, &pdev->dev);
 
@@ -2095,6 +2158,14 @@ static int gpmc_probe_dt(struct platform_device *pdev)
                return ret;
        }
 
+       return 0;
+}
+
+static int gpmc_probe_dt_children(struct platform_device *pdev)
+{
+       int ret;
+       struct device_node *child;
+
        for_each_available_child_of_node(pdev->dev.of_node, child) {
 
                if (!child->name)
@@ -2104,6 +2175,9 @@ static int gpmc_probe_dt(struct platform_device *pdev)
                        ret = gpmc_probe_onenand_child(pdev, child);
                else
                        ret = gpmc_probe_generic_child(pdev, child);
+
+               if (ret)
+                       return ret;
        }
 
        return 0;
@@ -2113,6 +2187,11 @@ static int gpmc_probe_dt(struct platform_device *pdev)
 {
        return 0;
 }
+
+static int gpmc_probe_dt_children(struct platform_device *pdev)
+{
+       return 0;
+}
 #endif
 
 static int gpmc_probe(struct platform_device *pdev)
@@ -2159,6 +2238,15 @@ static int gpmc_probe(struct platform_device *pdev)
                return -EINVAL;
        }
 
+       if (pdev->dev.of_node) {
+               rc = gpmc_probe_dt(pdev);
+               if (rc)
+                       return rc;
+       } else {
+               gpmc_cs_num = GPMC_CS_NUM;
+               gpmc_nr_waitpins = GPMC_NR_WAITPINS;
+       }
+
        pm_runtime_enable(&pdev->dev);
        pm_runtime_get_sync(&pdev->dev);
 
@@ -2184,29 +2272,33 @@ static int gpmc_probe(struct platform_device *pdev)
                 GPMC_REVISION_MINOR(l));
 
        gpmc_mem_init();
+       rc = gpmc_gpio_init(gpmc);
+       if (rc)
+               goto gpio_init_failed;
 
        rc = gpmc_setup_irq(gpmc);
        if (rc) {
                dev_err(gpmc->dev, "gpmc_setup_irq failed\n");
-               goto fail;
+               goto setup_irq_failed;
        }
 
-       if (!pdev->dev.of_node) {
-               gpmc_cs_num      = GPMC_CS_NUM;
-               gpmc_nr_waitpins = GPMC_NR_WAITPINS;
-       }
-
-       rc = gpmc_probe_dt(pdev);
+       rc = gpmc_probe_dt_children(pdev);
        if (rc < 0) {
-               dev_err(gpmc->dev, "failed to probe DT parameters\n");
-               gpmc_free_irq(gpmc);
-               goto fail;
+               dev_err(gpmc->dev, "failed to probe DT children\n");
+               goto dt_children_failed;
        }
 
        return 0;
 
-fail:
+dt_children_failed:
+       gpmc_free_irq(gpmc);
+setup_irq_failed:
+       gpmc_gpio_exit(gpmc);
+gpio_init_failed:
+       gpmc_mem_exit();
        pm_runtime_put_sync(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
+
        return rc;
 }
 
@@ -2215,6 +2307,7 @@ static int gpmc_remove(struct platform_device *pdev)
        struct gpmc_device *gpmc = platform_get_drvdata(pdev);
 
        gpmc_free_irq(gpmc);
+       gpmc_gpio_exit(gpmc);
        gpmc_mem_exit();
        pm_runtime_put_sync(&pdev->dev);
        pm_runtime_disable(&pdev->dev);