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gpio: davinci: Do not assume continuous IRQ numbering 

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>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Keerthy 2018-06-13 09:10:37 +05:30 committed by Linus Walleij
parent c1d013a70f
commit eb3744a2dd
2 changed files with 44 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/gpio/gpio-davinci.c
View File

@ -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);
/*--------------------------------------------------------------------------*/
@ -167,8 +167,8 @@ of_err:
static int davinci_gpio_probe(struct platform_device *pdev)
{
static int ctrl_num, bank_base;
int gpio, bank, bank_irq, ret = 0;
unsigned ngpio, nbank;
int gpio, bank, i, ret = 0;
unsigned int ngpio, nbank, nirq;
struct davinci_gpio_controller *chips;
struct davinci_gpio_platform_data *pdata;
struct device *dev = &pdev->dev;
@ -197,6 +197,16 @@ 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_kcalloc(dev,
nbank, sizeof(struct davinci_gpio_controller),
@ -209,10 +219,13 @@ 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 +262,7 @@ 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 +396,7 @@ 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;
}
@ -392,11 +405,18 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
{
struct davinci_gpio_controller *d;
struct davinci_gpio_regs __iomem *g;
u32 mask;
u32 mask, i;
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);
for (i = 0; i < MAX_INT_PER_BANK; i++)
if (data->irq == d->irqs[i])
break;
if (i == MAX_INT_PER_BANK)
return -EINVAL;
mask = __gpio_mask(i);
if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
return -EINVAL;
@ -458,7 +478,7 @@ static const struct of_device_id davinci_gpio_ids[];
* (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 +512,7 @@ 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 +552,11 @@ 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 +567,11 @@ 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 +581,7 @@ 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 +608,8 @@ 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);
}

3
include/linux/platform_data/gpio-davinci.h
View File

@ -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;
int irqs[MAX_INT_PER_BANK];
unsigned int base;
};