From 44ddf559d5792b2bffcd44febf9b7b55b03e06b4 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 29 Jun 2018 14:11:16 +1000 Subject: [PATCH] gpio: aspeed: Rework register type accessors Use a single accessor function for all register types instead of several spread around. This will make it easier/cleaner to introduce new registers and keep the mechanism in one place. The big switch/case is optimized at compile time since the switch value is a constant. Signed-off-by: Benjamin Herrenschmidt Reviewed-by: Joel Stanley Reviewed-by: Andrew Jeffery Signed-off-by: Linus Walleij --- drivers/gpio/gpio-aspeed.c | 118 ++++++++++++++++++++++++++------------------- 1 file changed, 69 insertions(+), 49 deletions(-) diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c index b31ae16..c9baeeb 100644 --- a/drivers/gpio/gpio-aspeed.c +++ b/drivers/gpio/gpio-aspeed.c @@ -127,12 +127,21 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = { }, }; -#define GPIO_BANK(x) ((x) >> 5) -#define GPIO_OFFSET(x) ((x) & 0x1f) -#define GPIO_BIT(x) BIT(GPIO_OFFSET(x)) +enum aspeed_gpio_reg { + reg_val, + reg_dir, + reg_irq_enable, + reg_irq_type0, + reg_irq_type1, + reg_irq_type2, + reg_irq_status, + reg_debounce_sel1, + reg_debounce_sel2, + reg_tolerance, +}; -#define GPIO_DATA 0x00 -#define GPIO_DIR 0x04 +#define GPIO_VAL_VALUE 0x00 +#define GPIO_VAL_DIR 0x04 #define GPIO_IRQ_ENABLE 0x00 #define GPIO_IRQ_TYPE0 0x04 @@ -143,6 +152,40 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = { #define GPIO_DEBOUNCE_SEL1 0x00 #define GPIO_DEBOUNCE_SEL2 0x04 +/* This will be resolved at compile time */ +static inline void __iomem *bank_reg(struct aspeed_gpio *gpio, + const struct aspeed_gpio_bank *bank, + const enum aspeed_gpio_reg reg) +{ + switch (reg) { + case reg_val: + return gpio->base + bank->val_regs + GPIO_VAL_VALUE; + case reg_dir: + return gpio->base + bank->val_regs + GPIO_VAL_DIR; + case reg_irq_enable: + return gpio->base + bank->irq_regs + GPIO_IRQ_ENABLE; + case reg_irq_type0: + return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE0; + case reg_irq_type1: + return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE1; + case reg_irq_type2: + return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE2; + case reg_irq_status: + return gpio->base + bank->irq_regs + GPIO_IRQ_STATUS; + case reg_debounce_sel1: + return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL1; + case reg_debounce_sel2: + return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL2; + case reg_tolerance: + return gpio->base + bank->tolerance_regs; + } + BUG_ON(1); +} + +#define GPIO_BANK(x) ((x) >> 5) +#define GPIO_OFFSET(x) ((x) & 0x1f) +#define GPIO_BIT(x) BIT(GPIO_OFFSET(x)) + #define _GPIO_SET_DEBOUNCE(t, o, i) ((!!((t) & BIT(i))) << GPIO_OFFSET(o)) #define GPIO_SET_DEBOUNCE1(t, o) _GPIO_SET_DEBOUNCE(t, o, 1) #define GPIO_SET_DEBOUNCE2(t, o) _GPIO_SET_DEBOUNCE(t, o, 0) @@ -201,27 +244,12 @@ static inline bool have_output(struct aspeed_gpio *gpio, unsigned int offset) return !props || (props->output & GPIO_BIT(offset)); } -static void __iomem *bank_val_reg(struct aspeed_gpio *gpio, - const struct aspeed_gpio_bank *bank, - unsigned int reg) -{ - return gpio->base + bank->val_regs + reg; -} - -static void __iomem *bank_irq_reg(struct aspeed_gpio *gpio, - const struct aspeed_gpio_bank *bank, - unsigned int reg) -{ - return gpio->base + bank->irq_regs + reg; -} - static int aspeed_gpio_get(struct gpio_chip *gc, unsigned int offset) { struct aspeed_gpio *gpio = gpiochip_get_data(gc); const struct aspeed_gpio_bank *bank = to_bank(offset); - return !!(ioread32(bank_val_reg(gpio, bank, GPIO_DATA)) - & GPIO_BIT(offset)); + return !!(ioread32(bank_reg(gpio, bank, reg_val)) & GPIO_BIT(offset)); } static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset, @@ -232,7 +260,7 @@ static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset, void __iomem *addr; u32 reg; - addr = bank_val_reg(gpio, bank, GPIO_DATA); + addr = bank_reg(gpio, bank, reg_val); reg = gpio->dcache[GPIO_BANK(offset)]; if (val) @@ -269,8 +297,8 @@ static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset) spin_lock_irqsave(&gpio->lock, flags); - reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR)); - iowrite32(reg & ~GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR)); + reg = ioread32(bank_reg(gpio, bank, reg_dir)); + iowrite32(reg & ~GPIO_BIT(offset), bank_reg(gpio, bank, reg_dir)); spin_unlock_irqrestore(&gpio->lock, flags); @@ -291,8 +319,8 @@ static int aspeed_gpio_dir_out(struct gpio_chip *gc, spin_lock_irqsave(&gpio->lock, flags); __aspeed_gpio_set(gc, offset, val); - reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR)); - iowrite32(reg | GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR)); + reg = ioread32(bank_reg(gpio, bank, reg_dir)); + iowrite32(reg | GPIO_BIT(offset), bank_reg(gpio, bank, reg_dir)); spin_unlock_irqrestore(&gpio->lock, flags); @@ -314,7 +342,7 @@ static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) spin_lock_irqsave(&gpio->lock, flags); - val = ioread32(bank_val_reg(gpio, bank, GPIO_DIR)) & GPIO_BIT(offset); + val = ioread32(bank_reg(gpio, bank, reg_dir)) & GPIO_BIT(offset); spin_unlock_irqrestore(&gpio->lock, flags); @@ -358,7 +386,7 @@ static void aspeed_gpio_irq_ack(struct irq_data *d) if (rc) return; - status_addr = bank_irq_reg(gpio, bank, GPIO_IRQ_STATUS); + status_addr = bank_reg(gpio, bank, reg_irq_status); spin_lock_irqsave(&gpio->lock, flags); iowrite32(bit, status_addr); @@ -378,7 +406,7 @@ static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set) if (rc) return; - addr = bank_irq_reg(gpio, bank, GPIO_IRQ_ENABLE); + addr = bank_reg(gpio, bank, reg_irq_enable); spin_lock_irqsave(&gpio->lock, flags); @@ -442,17 +470,17 @@ static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type) spin_lock_irqsave(&gpio->lock, flags); - addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE0); + addr = bank_reg(gpio, bank, reg_irq_type0); reg = ioread32(addr); reg = (reg & ~bit) | type0; iowrite32(reg, addr); - addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE1); + addr = bank_reg(gpio, bank, reg_irq_type1); reg = ioread32(addr); reg = (reg & ~bit) | type1; iowrite32(reg, addr); - addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE2); + addr = bank_reg(gpio, bank, reg_irq_type2); reg = ioread32(addr); reg = (reg & ~bit) | type2; iowrite32(reg, addr); @@ -477,7 +505,7 @@ static void aspeed_gpio_irq_handler(struct irq_desc *desc) for (i = 0; i < ARRAY_SIZE(aspeed_gpio_banks); i++) { const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i]; - reg = ioread32(bank_irq_reg(data, bank, GPIO_IRQ_STATUS)); + reg = ioread32(bank_reg(data, bank, reg_irq_status)); for_each_set_bit(p, ®, 32) { girq = irq_find_mapping(gc->irq.domain, i * 32 + p); @@ -549,21 +577,21 @@ static int aspeed_gpio_reset_tolerance(struct gpio_chip *chip, unsigned int offset, bool enable) { struct aspeed_gpio *gpio = gpiochip_get_data(chip); - const struct aspeed_gpio_bank *bank; unsigned long flags; + void __iomem *treg; u32 val; - bank = to_bank(offset); + treg = bank_reg(gpio, to_bank(offset), reg_tolerance); spin_lock_irqsave(&gpio->lock, flags); - val = readl(gpio->base + bank->tolerance_regs); + val = readl(treg); if (enable) val |= GPIO_BIT(offset); else val &= ~GPIO_BIT(offset); - writel(val, gpio->base + bank->tolerance_regs); + writel(val, treg); spin_unlock_irqrestore(&gpio->lock, flags); return 0; @@ -582,13 +610,6 @@ static void aspeed_gpio_free(struct gpio_chip *chip, unsigned int offset) pinctrl_gpio_free(chip->base + offset); } -static inline void __iomem *bank_debounce_reg(struct aspeed_gpio *gpio, - const struct aspeed_gpio_bank *bank, - unsigned int reg) -{ - return gpio->base + bank->debounce_regs + reg; -} - static int usecs_to_cycles(struct aspeed_gpio *gpio, unsigned long usecs, u32 *cycles) { @@ -666,11 +687,11 @@ static void configure_timer(struct aspeed_gpio *gpio, unsigned int offset, void __iomem *addr; u32 val; - addr = bank_debounce_reg(gpio, bank, GPIO_DEBOUNCE_SEL1); + addr = bank_reg(gpio, bank, reg_debounce_sel1); val = ioread32(addr); iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE1(timer, offset), addr); - addr = bank_debounce_reg(gpio, bank, GPIO_DEBOUNCE_SEL2); + addr = bank_reg(gpio, bank, reg_debounce_sel2); val = ioread32(addr); iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE2(timer, offset), addr); } @@ -904,9 +925,8 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev) /* Populate it with initial values read from the HW */ for (i = 0; i < banks; i++) { - const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i]; - gpio->dcache[i] = ioread32(gpio->base + bank->val_regs + - GPIO_DATA); + void __iomem *addr = bank_reg(gpio, &aspeed_gpio_banks[i], reg_val); + gpio->dcache[i] = ioread32(addr); } rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); -- 2.7.4