diff options
Diffstat (limited to 'drivers/gpio/gpio-tb10x.c')
-rw-r--r-- | drivers/gpio/gpio-tb10x.c | 96 |
1 files changed, 30 insertions, 66 deletions
diff --git a/drivers/gpio/gpio-tb10x.c b/drivers/gpio/gpio-tb10x.c index 422b0ac5a9de..d5e5d19f4c0a 100644 --- a/drivers/gpio/gpio-tb10x.c +++ b/drivers/gpio/gpio-tb10x.c @@ -45,14 +45,12 @@ /** - * @spinlock: used for atomic read/modify/write of registers * @base: register base address * @domain: IRQ domain of GPIO generated interrupts managed by this controller * @irq: Interrupt line of parent interrupt controller * @gc: gpio_chip structure associated to this GPIO controller */ struct tb10x_gpio { - spinlock_t spinlock; void __iomem *base; struct irq_domain *domain; int irq; @@ -76,60 +74,14 @@ static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs, u32 r; unsigned long flags; - spin_lock_irqsave(&gpio->spinlock, flags); + spin_lock_irqsave(&gpio->gc.bgpio_lock, flags); r = tb10x_reg_read(gpio, offs); r = (r & ~mask) | (val & mask); tb10x_reg_write(gpio, offs, r); - spin_unlock_irqrestore(&gpio->spinlock, flags); -} - -static int tb10x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) -{ - struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip); - int mask = BIT(offset); - int val = TB10X_GPIO_DIR_IN << offset; - - tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val); - - return 0; -} - -static int tb10x_gpio_get(struct gpio_chip *chip, unsigned offset) -{ - struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip); - int val; - - val = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_DATA); - - if (val & BIT(offset)) - return 1; - else - return 0; -} - -static void tb10x_gpio_set(struct gpio_chip *chip, unsigned offset, int value) -{ - struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip); - int mask = BIT(offset); - int val = value << offset; - - tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DATA, mask, val); -} - -static int tb10x_gpio_direction_out(struct gpio_chip *chip, - unsigned offset, int value) -{ - struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip); - int mask = BIT(offset); - int val = TB10X_GPIO_DIR_OUT << offset; - - tb10x_gpio_set(chip, offset, value); - tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val); - - return 0; + spin_unlock_irqrestore(&gpio->gc.bgpio_lock, flags); } static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset) @@ -184,8 +136,6 @@ static int tb10x_gpio_probe(struct platform_device *pdev) if (tb10x_gpio == NULL) return -ENOMEM; - spin_lock_init(&tb10x_gpio->spinlock); - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); tb10x_gpio->base = devm_ioremap_resource(dev, mem); if (IS_ERR(tb10x_gpio->base)) @@ -196,20 +146,34 @@ static int tb10x_gpio_probe(struct platform_device *pdev) if (!tb10x_gpio->gc.label) return -ENOMEM; - tb10x_gpio->gc.parent = &pdev->dev; - tb10x_gpio->gc.owner = THIS_MODULE; - tb10x_gpio->gc.direction_input = tb10x_gpio_direction_in; - tb10x_gpio->gc.get = tb10x_gpio_get; - tb10x_gpio->gc.direction_output = tb10x_gpio_direction_out; - tb10x_gpio->gc.set = tb10x_gpio_set; - tb10x_gpio->gc.request = gpiochip_generic_request; - tb10x_gpio->gc.free = gpiochip_generic_free; - tb10x_gpio->gc.base = -1; - tb10x_gpio->gc.ngpio = ngpio; - tb10x_gpio->gc.can_sleep = false; - - - ret = devm_gpiochip_add_data(&pdev->dev, &tb10x_gpio->gc, tb10x_gpio); + /* + * Initialize generic GPIO with one single register for reading and setting + * the lines, no special set or clear registers and a data direction register + * wher 1 means "output". + */ + ret = bgpio_init(&tb10x_gpio->gc, dev, 4, + tb10x_gpio->base + OFFSET_TO_REG_DATA, + NULL, + NULL, + tb10x_gpio->base + OFFSET_TO_REG_DDR, + NULL, + 0); + if (ret) { + dev_err(dev, "unable to init generic GPIO\n"); + return ret; + } + tb10x_gpio->gc.base = -1; + tb10x_gpio->gc.parent = dev; + tb10x_gpio->gc.owner = THIS_MODULE; + /* + * ngpio is set by bgpio_init() but we override it, this .request() + * callback also overrides the one set up by generic GPIO. + */ + tb10x_gpio->gc.ngpio = ngpio; + tb10x_gpio->gc.request = gpiochip_generic_request; + tb10x_gpio->gc.free = gpiochip_generic_free; + + ret = devm_gpiochip_add_data(dev, &tb10x_gpio->gc, tb10x_gpio); if (ret < 0) { dev_err(dev, "Could not add gpiochip.\n"); return ret; |