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authorLinus Walleij <linus.walleij@linaro.org>2015-06-17 16:45:41 +0300
committerLinus Walleij <linus.walleij@linaro.org>2015-07-23 10:11:04 +0300
commitbc222ef4f79fa0003ef5a0af8090372e3bd8a783 (patch)
treea6d470b25a7a9e4c0108e46cfe27d80425cca660 /drivers/pinctrl
parent6de52c15132f6b86030bf3159020e3314ec14952 (diff)
downloadlinux-bc222ef4f79fa0003ef5a0af8090372e3bd8a783.tar.xz
pinctrl: nomadik: break out state container allocator
Break out the function that allocates the nomadik GPIO chip state container to its own function. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/nomadik/pinctrl-nomadik.c106
1 files changed, 71 insertions, 35 deletions
diff --git a/drivers/pinctrl/nomadik/pinctrl-nomadik.c b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
index 56e79c12562e..ceed731d4a2d 100644
--- a/drivers/pinctrl/nomadik/pinctrl-nomadik.c
+++ b/drivers/pinctrl/nomadik/pinctrl-nomadik.c
@@ -203,6 +203,7 @@ typedef unsigned long pin_cfg_t;
#define GPIO_BLOCK_SHIFT 5
#define NMK_GPIO_PER_CHIP (1 << GPIO_BLOCK_SHIFT)
+#define NMK_MAX_BANKS DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)
/* Register in the logic block */
#define NMK_GPIO_DAT 0x00
@@ -282,8 +283,7 @@ struct nmk_pinctrl {
void __iomem *prcm_base;
};
-static struct nmk_gpio_chip *
-nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];
+static struct nmk_gpio_chip *nmk_gpio_chips[NMK_MAX_BANKS];
static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
@@ -1160,29 +1160,90 @@ void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
}
}
+/*
+ * We will allocate memory for the state container using devm* allocators
+ * binding to the first device reaching this point, it doesn't matter if
+ * it is the pin controller or GPIO driver. However we need to use the right
+ * platform device when looking up resources so pay attention to pdev.
+ */
+static struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np,
+ struct platform_device *pdev)
+{
+ struct nmk_gpio_chip *nmk_chip;
+ struct platform_device *gpio_pdev;
+ struct gpio_chip *chip;
+ struct resource *res;
+ struct clk *clk;
+ void __iomem *base;
+ u32 id;
+
+ gpio_pdev = of_find_device_by_node(np);
+ if (!gpio_pdev) {
+ pr_err("populate \"%s\": device not found\n", np->name);
+ return ERR_PTR(-ENODEV);
+ }
+ if (of_property_read_u32(np, "gpio-bank", &id)) {
+ dev_err(&pdev->dev, "populate: gpio-bank property not found\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* Already populated? */
+ nmk_chip = nmk_gpio_chips[id];
+ if (nmk_chip)
+ return nmk_chip;
+
+ nmk_chip = devm_kzalloc(&pdev->dev, sizeof(*nmk_chip), GFP_KERNEL);
+ if (!nmk_chip)
+ return ERR_PTR(-ENOMEM);
+
+ nmk_chip->bank = id;
+ chip = &nmk_chip->chip;
+ chip->base = id * NMK_GPIO_PER_CHIP;
+ chip->ngpio = NMK_GPIO_PER_CHIP;
+ chip->label = dev_name(&gpio_pdev->dev);
+ chip->dev = &gpio_pdev->dev;
+
+ res = platform_get_resource(gpio_pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return base;
+ nmk_chip->addr = base;
+
+ clk = clk_get(&gpio_pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return (void *) clk;
+ clk_prepare(clk);
+ nmk_chip->clk = clk;
+
+ BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
+ nmk_gpio_chips[id] = nmk_chip;
+ return nmk_chip;
+}
+
static int nmk_gpio_probe(struct platform_device *dev)
{
struct device_node *np = dev->dev.of_node;
struct nmk_gpio_chip *nmk_chip;
struct gpio_chip *chip;
struct irq_chip *irqchip;
- struct resource *res;
- struct clk *clk;
int latent_irq;
bool supports_sleepmode;
- void __iomem *base;
int irq;
int ret;
+ nmk_chip = nmk_gpio_populate_chip(np, dev);
+ if (IS_ERR(nmk_chip)) {
+ dev_err(&dev->dev, "could not populate nmk chip struct\n");
+ return PTR_ERR(nmk_chip);
+ }
+
if (of_get_property(np, "st,supports-sleepmode", NULL))
supports_sleepmode = true;
else
supports_sleepmode = false;
- if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
- dev_err(&dev->dev, "gpio-bank property not found\n");
- return -EINVAL;
- }
+ /* Correct platform device ID */
+ dev->id = nmk_chip->bank;
irq = platform_get_irq(dev, 0);
if (irq < 0)
@@ -1191,27 +1252,10 @@ static int nmk_gpio_probe(struct platform_device *dev)
/* It's OK for this IRQ not to be present */
latent_irq = platform_get_irq(dev, 1);
- res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- base = devm_ioremap_resource(&dev->dev, res);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
- clk = devm_clk_get(&dev->dev, NULL);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
- clk_prepare(clk);
-
- nmk_chip = devm_kzalloc(&dev->dev, sizeof(*nmk_chip), GFP_KERNEL);
- if (!nmk_chip)
- return -ENOMEM;
-
/*
* The virt address in nmk_chip->addr is in the nomadik register space,
* so we can simply convert the resource address, without remapping
*/
- nmk_chip->bank = dev->id;
- nmk_chip->clk = clk;
- nmk_chip->addr = base;
nmk_chip->parent_irq = irq;
nmk_chip->latent_parent_irq = latent_irq;
nmk_chip->sleepmode = supports_sleepmode;
@@ -1226,10 +1270,6 @@ static int nmk_gpio_probe(struct platform_device *dev)
chip->set = nmk_gpio_set_output;
chip->dbg_show = nmk_gpio_dbg_show;
chip->can_sleep = false;
- chip->base = dev->id * NMK_GPIO_PER_CHIP;
- chip->ngpio = NMK_GPIO_PER_CHIP;
- chip->label = dev_name(&dev->dev);
- chip->dev = &dev->dev;
chip->owner = THIS_MODULE;
irqchip = &nmk_chip->irqchip;
@@ -1251,14 +1291,10 @@ static int nmk_gpio_probe(struct platform_device *dev)
clk_disable(nmk_chip->clk);
chip->of_node = np;
- ret = gpiochip_add(&nmk_chip->chip);
+ ret = gpiochip_add(chip);
if (ret)
return ret;
- BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
-
- nmk_gpio_chips[nmk_chip->bank] = nmk_chip;
-
platform_set_drvdata(dev, nmk_chip);
/*