From 043aa3db1cbb51251849c262c4c549b665ad93de Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 10 May 2021 22:46:31 +0300 Subject: gpio: xilinx: Introduce xgpio_read_chan() / xgpio_write_chan() With the new helpers, i.e. xgpio_read_chan() / xgpio_write_chan(), the code is easier to read and maintain. No functional changes intended. Signed-off-by: Andy Shevchenko Tested-by: Neeli Srinivas Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpio-xilinx.c | 68 +++++++++++++++++++++++++--------------------- 1 file changed, 37 insertions(+), 31 deletions(-) (limited to 'drivers/gpio/gpio-xilinx.c') diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c index b411d3156e0b..5828743a9f1d 100644 --- a/drivers/gpio/gpio-xilinx.c +++ b/drivers/gpio/gpio-xilinx.c @@ -23,7 +23,8 @@ #define XGPIO_DATA_OFFSET (0x0) /* Data register */ #define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */ -#define XGPIO_CHANNEL_OFFSET 0x8 +#define XGPIO_CHANNEL0_OFFSET 0x0 +#define XGPIO_CHANNEL1_OFFSET 0x8 #define XGPIO_GIER_OFFSET 0x11c /* Global Interrupt Enable */ #define XGPIO_GIER_IE BIT(31) @@ -79,12 +80,26 @@ static inline int xgpio_index(struct xgpio_instance *chip, int gpio) return 0; } -static inline int xgpio_regoffset(struct xgpio_instance *chip, int gpio) +static inline int xgpio_regoffset(struct xgpio_instance *chip, int ch) { - if (xgpio_index(chip, gpio)) - return XGPIO_CHANNEL_OFFSET; + switch (ch) { + case 0: + return XGPIO_CHANNEL0_OFFSET; + case 1: + return XGPIO_CHANNEL1_OFFSET; + default: + return -EINVAL; + } +} - return 0; +static inline u32 xgpio_read_chan(struct xgpio_instance *chip, int reg, int ch) +{ + return xgpio_readreg(chip->regs + reg + xgpio_regoffset(chip, ch)); +} + +static inline void xgpio_write_chan(struct xgpio_instance *chip, int reg, int ch, u32 v) +{ + xgpio_writereg(chip->regs + reg + xgpio_regoffset(chip, ch), v); } static inline int xgpio_offset(struct xgpio_instance *chip, int gpio) @@ -109,12 +124,13 @@ static inline int xgpio_offset(struct xgpio_instance *chip, int gpio) static int xgpio_get(struct gpio_chip *gc, unsigned int gpio) { struct xgpio_instance *chip = gpiochip_get_data(gc); + int index = xgpio_index(chip, gpio); + int offset = xgpio_offset(chip, gpio); u32 val; - val = xgpio_readreg(chip->regs + XGPIO_DATA_OFFSET + - xgpio_regoffset(chip, gpio)); + val = xgpio_read_chan(chip, XGPIO_DATA_OFFSET, index); - return !!(val & BIT(xgpio_offset(chip, gpio))); + return !!(val & BIT(offset)); } /** @@ -141,8 +157,7 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) else chip->gpio_state[index] &= ~BIT(offset); - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - xgpio_regoffset(chip, gpio), chip->gpio_state[index]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, index, chip->gpio_state[index]); spin_unlock_irqrestore(&chip->gpio_lock, flags); } @@ -172,9 +187,8 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, break; /* Once finished with an index write it out to the register */ if (index != xgpio_index(chip, i)) { - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET, - chip->gpio_state[index]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, index, + chip->gpio_state[index]); spin_unlock_irqrestore(&chip->gpio_lock, flags); index = xgpio_index(chip, i); spin_lock_irqsave(&chip->gpio_lock, flags); @@ -188,8 +202,7 @@ static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, } } - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, index, chip->gpio_state[index]); spin_unlock_irqrestore(&chip->gpio_lock, flags); } @@ -214,8 +227,7 @@ static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) /* Set the GPIO bit in shadow register and set direction as input */ chip->gpio_dir[index] |= BIT(offset); - xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET + - xgpio_regoffset(chip, gpio), chip->gpio_dir[index]); + xgpio_write_chan(chip, XGPIO_TRI_OFFSET, index, chip->gpio_dir[index]); spin_unlock_irqrestore(&chip->gpio_lock, flags); @@ -248,13 +260,11 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) chip->gpio_state[index] |= BIT(offset); else chip->gpio_state[index] &= ~BIT(offset); - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + - xgpio_regoffset(chip, gpio), chip->gpio_state[index]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, index, chip->gpio_state[index]); /* Clear the GPIO bit in shadow register and set direction as output */ chip->gpio_dir[index] &= ~BIT(offset); - xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET + - xgpio_regoffset(chip, gpio), chip->gpio_dir[index]); + xgpio_write_chan(chip, XGPIO_TRI_OFFSET, index, chip->gpio_dir[index]); spin_unlock_irqrestore(&chip->gpio_lock, flags); @@ -267,16 +277,14 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) */ static void xgpio_save_regs(struct xgpio_instance *chip) { - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET, chip->gpio_state[0]); - xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET, chip->gpio_dir[0]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, 0, chip->gpio_state[0]); + xgpio_write_chan(chip, XGPIO_TRI_OFFSET, 0, chip->gpio_dir[0]); if (!chip->gpio_width[1]) return; - xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET + XGPIO_CHANNEL_OFFSET, - chip->gpio_state[1]); - xgpio_writereg(chip->regs + XGPIO_TRI_OFFSET + XGPIO_CHANNEL_OFFSET, - chip->gpio_dir[1]); + xgpio_write_chan(chip, XGPIO_DATA_OFFSET, 1, chip->gpio_state[1]); + xgpio_write_chan(chip, XGPIO_TRI_OFFSET, 1, chip->gpio_dir[1]); } static int xgpio_request(struct gpio_chip *chip, unsigned int offset) @@ -434,8 +442,7 @@ static void xgpio_irq_unmask(struct irq_data *irq_data) xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, val); /* Update GPIO IRQ read data before enabling interrupt*/ - val = xgpio_readreg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET); + val = xgpio_read_chan(chip, XGPIO_DATA_OFFSET, index); chip->gpio_last_irq_read[index] = val; /* Enable per channel interrupt */ @@ -512,8 +519,7 @@ static void xgpio_irqhandler(struct irq_desc *desc) unsigned int irq; spin_lock_irqsave(&chip->gpio_lock, flags); - data = xgpio_readreg(chip->regs + XGPIO_DATA_OFFSET + - index * XGPIO_CHANNEL_OFFSET); + data = xgpio_read_chan(chip, XGPIO_DATA_OFFSET, index); rising_events = data & ~chip->gpio_last_irq_read[index] & chip->irq_enable[index] & -- cgit v1.2.3