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Subject[PATCH v2 2/2] gpio: davinci: Do not assume continuous IRQ numbering
Date
Currently the driver assumes that the interrupts are continuous
and does platform_get_irq only once and assumes the rest are continuous,
instead call platform_get_irq for all the interrupts and store them
in an array for later use.

Signed-off-by: Keerthy <j-keerthy@ti.com>
---

Tested for GPIO Interrupts on da850-lcdk and keystone-k2g-evm boards.

Changes in v2:

* Extended the logic of using saved IRQs to unbanked IRQs
as per Grygorii's suggestion.

drivers/gpio/gpio-davinci.c | 53 +++++++++++++++++++-----------
include/linux/platform_data/gpio-davinci.h | 3 +-
2 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 861f35b..b2119c0 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -55,7 +55,7 @@ static inline struct davinci_gpio_regs __iomem *irq2regs(struct irq_data *d)
return g;
}

-static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq);
+static int davinci_gpio_irq_setup(struct platform_device *pdev);

/*--------------------------------------------------------------------------*/

@@ -168,7 +168,8 @@ static int davinci_gpio_probe(struct platform_device *pdev)
{
static int ctrl_num, bank_base;
int gpio, bank, ret = 0;
- unsigned ngpio, nbank, bank_irq;
+ unsigned int ngpio, nbank, nirq;
+ int i;
struct davinci_gpio_controller *chips;
struct davinci_gpio_platform_data *pdata;
struct device *dev = &pdev->dev;
@@ -197,6 +198,16 @@ static int davinci_gpio_probe(struct platform_device *pdev)
if (WARN_ON(ARCH_NR_GPIOS < ngpio))
ngpio = ARCH_NR_GPIOS;

+ /*
+ * If there are unbanked interrupts then the number of
+ * interrupts is equal to number of gpios else all are banked so
+ * number of interrupts is equal to number of banks(each with 16 gpios)
+ */
+ if (pdata->gpio_unbanked)
+ nirq = pdata->gpio_unbanked;
+ else
+ nirq = DIV_ROUND_UP(ngpio, 16);
+
nbank = DIV_ROUND_UP(ngpio, 32);
chips = devm_kzalloc(dev,
nbank * sizeof(struct davinci_gpio_controller),
@@ -209,10 +220,13 @@ static int davinci_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpio_base))
return PTR_ERR(gpio_base);

- bank_irq = platform_get_irq(pdev, 0);
- if (bank_irq < 0) {
- dev_dbg(dev, "IRQ not populated\n");
- return bank_irq;
+ for (i = 0; i < nirq; i++) {
+ chips->irqs[i] = platform_get_irq(pdev, i);
+ if (chips->irqs[i] < 0) {
+ dev_info(dev, "IRQ not populated, err = %d\n",
+ chips->irqs[i]);
+ return chips->irqs[i];
+ }
}

snprintf(label, MAX_LABEL_SIZE, "davinci_gpio.%d", ctrl_num++);
@@ -249,7 +263,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
goto err;

platform_set_drvdata(pdev, chips);
- ret = davinci_gpio_irq_setup(pdev, bank_irq);
+ ret = davinci_gpio_irq_setup(pdev);
if (ret)
goto err;

@@ -383,7 +397,7 @@ static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
* can provide direct-mapped IRQs to AINTC (up to 32 GPIOs).
*/
if (offset < d->gpio_unbanked)
- return d->base_irq + offset;
+ return d->irqs[offset];
else
return -ENODEV;
}
@@ -396,7 +410,7 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)

d = (struct davinci_gpio_controller *)irq_data_get_irq_handler_data(data);
g = (struct davinci_gpio_regs __iomem *)d->regs[0];
- mask = __gpio_mask(data->irq - d->base_irq);
+ mask = __gpio_mask(data->irq - d->irqs[0]);

if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
return -EINVAL;
@@ -458,7 +472,7 @@ static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
* (dm6446) can be set appropriately for GPIOV33 pins.
*/

-static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
+static int davinci_gpio_irq_setup(struct platform_device *pdev)
{
unsigned gpio, bank;
int irq;
@@ -492,6 +506,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
dev_err(dev, "Error %ld getting gpio clock\n", PTR_ERR(clk));
return PTR_ERR(clk);
}
+
ret = clk_prepare_enable(clk);
if (ret)
return ret;
@@ -531,12 +546,11 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
if (pdata->gpio_unbanked) {
/* pass "bank 0" GPIO IRQs to AINTC */
chips->chip.to_irq = gpio_to_irq_unbanked;
- chips->base_irq = bank_irq;
chips->gpio_unbanked = pdata->gpio_unbanked;
binten = GENMASK(pdata->gpio_unbanked / 16, 0);

/* AINTC handles mask/unmask; GPIO handles triggering */
- irq = bank_irq;
+ irq = chips->irqs[0];
irq_chip = gpio_get_irq_chip(irq);
irq_chip->name = "GPIO-AINTC";
irq_chip->irq_set_type = gpio_irq_type_unbanked;
@@ -547,10 +561,11 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
writel_relaxed(~0, &g->set_rising);

/* set the direct IRQs up to use that irqchip */
- for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++, irq++) {
- irq_set_chip(irq, irq_chip);
- irq_set_handler_data(irq, chips);
- irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH);
+ for (gpio = 0; gpio < pdata->gpio_unbanked; gpio++) {
+ irq_set_chip(chips->irqs[gpio], irq_chip);
+ irq_set_handler_data(chips->irqs[gpio], chips);
+ irq_set_status_flags(chips->irqs[gpio],
+ IRQ_TYPE_EDGE_BOTH);
}

goto done;
@@ -560,7 +575,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
* Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
* then chain through our own handler.
*/
- for (gpio = 0, bank = 0; gpio < ngpio; bank++, bank_irq++, gpio += 16) {
+ for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 16) {
/* disabled by default, enabled only as needed
* There are register sets for 32 GPIOs. 2 banks of 16
* GPIOs are covered by each set of registers hence divide by 2
@@ -587,8 +602,8 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev, int bank_irq)
irqdata->bank_num = bank;
irqdata->chip = chips;

- irq_set_chained_handler_and_data(bank_irq, gpio_irq_handler,
- irqdata);
+ irq_set_chained_handler_and_data(chips->irqs[bank],
+ gpio_irq_handler, irqdata);

binten |= BIT(bank);
}
diff --git a/include/linux/platform_data/gpio-davinci.h b/include/linux/platform_data/gpio-davinci.h
index 90ae19c..cf884d1 100644
--- a/include/linux/platform_data/gpio-davinci.h
+++ b/include/linux/platform_data/gpio-davinci.h
@@ -22,6 +22,7 @@
#include <asm-generic/gpio.h>

#define MAX_REGS_BANKS 5
+#define MAX_INT_PER_BANK 32

struct davinci_gpio_platform_data {
u32 ngpio;
@@ -41,7 +42,7 @@ struct davinci_gpio_controller {
spinlock_t lock;
void __iomem *regs[MAX_REGS_BANKS];
int gpio_unbanked;
- unsigned int base_irq;
+ unsigned int irqs[MAX_INT_PER_BANK];
unsigned int base;
};

--
1.9.1
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