summaryrefslogtreecommitdiff
path: root/drivers/gpio/gpio-davinci.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpio/gpio-davinci.c')
-rw-r--r--drivers/gpio/gpio-davinci.c189
1 files changed, 130 insertions, 59 deletions
diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 8847adf392b7..7629b4f12b7f 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -16,8 +16,13 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/platform_data/gpio-davinci.h>
+#include <linux/irqchip/chained_irq.h>
struct davinci_gpio_regs {
u32 dir;
@@ -82,14 +87,14 @@ static inline int __davinci_direction(struct gpio_chip *chip,
u32 mask = 1 << offset;
spin_lock_irqsave(&d->lock, flags);
- temp = __raw_readl(&g->dir);
+ temp = readl_relaxed(&g->dir);
if (out) {
temp &= ~mask;
- __raw_writel(mask, value ? &g->set_data : &g->clr_data);
+ writel_relaxed(mask, value ? &g->set_data : &g->clr_data);
} else {
temp |= mask;
}
- __raw_writel(temp, &g->dir);
+ writel_relaxed(temp, &g->dir);
spin_unlock_irqrestore(&d->lock, flags);
return 0;
@@ -118,7 +123,7 @@ static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset)
struct davinci_gpio_controller *d = chip2controller(chip);
struct davinci_gpio_regs __iomem *g = d->regs;
- return (1 << offset) & __raw_readl(&g->in_data);
+ return (1 << offset) & readl_relaxed(&g->in_data);
}
/*
@@ -130,7 +135,41 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
struct davinci_gpio_controller *d = chip2controller(chip);
struct davinci_gpio_regs __iomem *g = d->regs;
- __raw_writel((1 << offset), value ? &g->set_data : &g->clr_data);
+ writel_relaxed((1 << offset), value ? &g->set_data : &g->clr_data);
+}
+
+static struct davinci_gpio_platform_data *
+davinci_gpio_get_pdata(struct platform_device *pdev)
+{
+ struct device_node *dn = pdev->dev.of_node;
+ struct davinci_gpio_platform_data *pdata;
+ int ret;
+ u32 val;
+
+ if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
+ return pdev->dev.platform_data;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ ret = of_property_read_u32(dn, "ti,ngpio", &val);
+ if (ret)
+ goto of_err;
+
+ pdata->ngpio = val;
+
+ ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
+ if (ret)
+ goto of_err;
+
+ pdata->gpio_unbanked = val;
+
+ return pdata;
+
+of_err:
+ dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
+ return NULL;
}
static int davinci_gpio_probe(struct platform_device *pdev)
@@ -143,12 +182,14 @@ static int davinci_gpio_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct resource *res;
- pdata = dev->platform_data;
+ pdata = davinci_gpio_get_pdata(pdev);
if (!pdata) {
dev_err(dev, "No platform data found\n");
return -EINVAL;
}
+ dev->platform_data = pdata;
+
/*
* The gpio banks conceptually expose a segmented bitmap,
* and "ngpio" is one more than the largest zero-based
@@ -160,8 +201,8 @@ static int davinci_gpio_probe(struct platform_device *pdev)
return -EINVAL;
}
- if (WARN_ON(DAVINCI_N_GPIO < ngpio))
- ngpio = DAVINCI_N_GPIO;
+ if (WARN_ON(ARCH_NR_GPIOS < ngpio))
+ ngpio = ARCH_NR_GPIOS;
chips = devm_kzalloc(dev,
ngpio * sizeof(struct davinci_gpio_controller),
@@ -194,6 +235,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
if (chips[i].chip.ngpio > 32)
chips[i].chip.ngpio = 32;
+#ifdef CONFIG_OF_GPIO
+ chips[i].chip.of_node = dev->of_node;
+#endif
spin_lock_init(&chips[i].lock);
regs = gpio2regs(base);
@@ -227,8 +271,8 @@ static void gpio_irq_disable(struct irq_data *d)
struct davinci_gpio_regs __iomem *g = irq2regs(d->irq);
u32 mask = (u32) irq_data_get_irq_handler_data(d);
- __raw_writel(mask, &g->clr_falling);
- __raw_writel(mask, &g->clr_rising);
+ writel_relaxed(mask, &g->clr_falling);
+ writel_relaxed(mask, &g->clr_rising);
}
static void gpio_irq_enable(struct irq_data *d)
@@ -242,9 +286,9 @@ static void gpio_irq_enable(struct irq_data *d)
status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING;
if (status & IRQ_TYPE_EDGE_FALLING)
- __raw_writel(mask, &g->set_falling);
+ writel_relaxed(mask, &g->set_falling);
if (status & IRQ_TYPE_EDGE_RISING)
- __raw_writel(mask, &g->set_rising);
+ writel_relaxed(mask, &g->set_rising);
}
static int gpio_irq_type(struct irq_data *d, unsigned trigger)
@@ -278,34 +322,28 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
mask <<= 16;
/* temporarily mask (level sensitive) parent IRQ */
- desc->irq_data.chip->irq_mask(&desc->irq_data);
- desc->irq_data.chip->irq_ack(&desc->irq_data);
+ chained_irq_enter(irq_desc_get_chip(desc), desc);
while (1) {
u32 status;
- int n;
- int res;
+ int bit;
/* ack any irqs */
- status = __raw_readl(&g->intstat) & mask;
+ status = readl_relaxed(&g->intstat) & mask;
if (!status)
break;
- __raw_writel(status, &g->intstat);
+ writel_relaxed(status, &g->intstat);
/* now demux them to the right lowlevel handler */
- n = d->irq_base;
- if (irq & 1) {
- n += 16;
- status >>= 16;
- }
while (status) {
- res = ffs(status);
- n += res;
- generic_handle_irq(n - 1);
- status >>= res;
+ bit = __ffs(status);
+ status &= ~BIT(bit);
+ generic_handle_irq(
+ irq_find_mapping(d->irq_domain,
+ d->chip.base + bit));
}
}
- desc->irq_data.chip->irq_unmask(&desc->irq_data);
+ chained_irq_exit(irq_desc_get_chip(desc), desc);
/* now it may re-trigger */
}
@@ -313,10 +351,10 @@ static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
{
struct davinci_gpio_controller *d = chip2controller(chip);
- if (d->irq_base >= 0)
- return d->irq_base + offset;
+ if (d->irq_domain)
+ return irq_create_mapping(d->irq_domain, d->chip.base + offset);
else
- return -ENODEV;
+ return -ENXIO;
}
static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
@@ -327,7 +365,7 @@ static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
* NOTE: we assume for now that only irqs in the first gpio_chip
* can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
*/
- if (offset < d->irq_base)
+ if (offset < d->gpio_unbanked)
return d->gpio_irq + offset;
else
return -ENODEV;
@@ -346,14 +384,35 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
return -EINVAL;
- __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
+ writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_FALLING)
? &g->set_falling : &g->clr_falling);
- __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING)
+ writel_relaxed(mask, (trigger & IRQ_TYPE_EDGE_RISING)
? &g->set_rising : &g->clr_rising);
return 0;
}
+static int
+davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ struct davinci_gpio_regs __iomem *g = gpio2regs(hw);
+
+ irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq,
+ "davinci_gpio");
+ irq_set_irq_type(irq, IRQ_TYPE_NONE);
+ irq_set_chip_data(irq, (__force void *)g);
+ irq_set_handler_data(irq, (void *)__gpio_mask(hw));
+ set_irq_flags(irq, IRQF_VALID);
+
+ return 0;
+}
+
+static const struct irq_domain_ops davinci_gpio_irq_ops = {
+ .map = davinci_gpio_irq_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
/*
* NOTE: for suspend/resume, probably best to make a platform_device with
* suspend_late/resume_resume calls hooking into results of the set_wake()
@@ -373,6 +432,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
struct davinci_gpio_platform_data *pdata = dev->platform_data;
struct davinci_gpio_regs __iomem *g;
+ struct irq_domain *irq_domain = NULL;
ngpio = pdata->ngpio;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -396,6 +456,22 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
}
clk_prepare_enable(clk);
+ if (!pdata->gpio_unbanked) {
+ irq = irq_alloc_descs(-1, 0, ngpio, 0);
+ if (irq < 0) {
+ dev_err(dev, "Couldn't allocate IRQ numbers\n");
+ return irq;
+ }
+
+ irq_domain = irq_domain_add_legacy(NULL, ngpio, irq, 0,
+ &davinci_gpio_irq_ops,
+ chips);
+ if (!irq_domain) {
+ dev_err(dev, "Couldn't register an IRQ domain\n");
+ return -ENODEV;
+ }
+ }
+
/*
* Arrange gpio_to_irq() support, handling either direct IRQs or
* banked IRQs. Having GPIOs in the first GPIO bank use direct
@@ -404,9 +480,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
*/
for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) {
chips[bank].chip.to_irq = gpio_to_irq_banked;
- chips[bank].irq_base = pdata->gpio_unbanked
- ? -EINVAL
- : (pdata->intc_irq_num + gpio);
+ chips[bank].irq_domain = irq_domain;
}
/*
@@ -419,6 +493,8 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
/* pass "bank 0" GPIO IRQs to AINTC */
chips[0].chip.to_irq = gpio_to_irq_unbanked;
+ chips[0].gpio_irq = bank_irq;
+ chips[0].gpio_unbanked = pdata->gpio_unbanked;
binten = BIT(0);
/* AINTC handles mask/unmask; GPIO handles triggering */
@@ -430,8 +506,8 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
/* default trigger: both edges */
g = gpio2regs(0);
- __raw_writel(~0, &g->set_falling);
- __raw_writel(~0, &g->set_rising);
+ writel_relaxed(~0, &g->set_falling);
+ writel_relaxed(~0, &g->set_rising);
/* set the direct IRQs up to use that irqchip */
for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++, irq++) {
@@ -447,15 +523,11 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
* Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
* then chain through our own handler.
*/
- for (gpio = 0, irq = gpio_to_irq(0), bank = 0;
- gpio < ngpio;
- bank++, bank_irq++) {
- unsigned i;
-
+ for (gpio = 0, bank = 0; gpio < ngpio; bank++, bank_irq++, gpio += 16) {
/* disabled by default, enabled only as needed */
g = gpio2regs(gpio);
- __raw_writel(~0, &g->clr_falling);
- __raw_writel(~0, &g->clr_rising);
+ writel_relaxed(~0, &g->clr_falling);
+ writel_relaxed(~0, &g->clr_rising);
/* set up all irqs in this bank */
irq_set_chained_handler(bank_irq, gpio_irq_handler);
@@ -467,14 +539,6 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
*/
irq_set_handler_data(bank_irq, &chips[gpio / 32]);
- for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) {
- irq_set_chip(irq, &gpio_irqchip);
- irq_set_chip_data(irq, (__force void *)g);
- irq_set_handler_data(irq, (void *)__gpio_mask(gpio));
- irq_set_handler(irq, handle_simple_irq);
- set_irq_flags(irq, IRQF_VALID);
- }
-
binten |= BIT(bank);
}
@@ -483,18 +547,25 @@ done:
* BINTEN -- per-bank interrupt enable. genirq would also let these
* bits be set/cleared dynamically.
*/
- __raw_writel(binten, gpio_base + BINTEN);
-
- printk(KERN_INFO "DaVinci: %d gpio irqs\n", irq - gpio_to_irq(0));
+ writel_relaxed(binten, gpio_base + BINTEN);
return 0;
}
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id davinci_gpio_ids[] = {
+ { .compatible = "ti,dm6441-gpio", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
+#endif
+
static struct platform_driver davinci_gpio_driver = {
.probe = davinci_gpio_probe,
.driver = {
- .name = "davinci_gpio",
- .owner = THIS_MODULE,
+ .name = "davinci_gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(davinci_gpio_ids),
},
};
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-04 00:15:57 +0000