From b0f49e9b9e2cf0b4c09998bd806dd6ede6c4ad61 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Wed, 4 Dec 2019 16:51:11 -0800 Subject: [PATCH] gpio: gpio-mm: utilize for_each_set_clump8 macro Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity. Link: http://lkml.kernel.org/r/0de53d7021b2d6db10294473cd8a1b6102bcec94.1570641097.git.vilhelm.gray@gmail.com Signed-off-by: William Breathitt Gray Reviewed-by: Linus Walleij Cc: Andy Shevchenko Cc: Arnd Bergmann Cc: Bartosz Golaszewski Cc: Geert Uytterhoeven Cc: Geert Uytterhoeven Cc: Lukas Wunner Cc: Masahiro Yamada Cc: Mathias Duckeck Cc: Morten Hein Tiljeset Cc: Phil Reid Cc: Rasmus Villemoes Cc: Sean Nyekjaer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/gpio/gpio-gpio-mm.c | 73 +++++++++++++-------------------------------- 1 file changed, 21 insertions(+), 52 deletions(-) diff --git a/drivers/gpio/gpio-gpio-mm.c b/drivers/gpio/gpio-gpio-mm.c index c22d6f9..b89b8c5 100644 --- a/drivers/gpio/gpio-gpio-mm.c +++ b/drivers/gpio/gpio-gpio-mm.c @@ -167,46 +167,25 @@ static int gpiomm_gpio_get(struct gpio_chip *chip, unsigned int offset) return !!(port_state & mask); } +static const size_t ports[] = { 0, 1, 2, 4, 5, 6 }; + static int gpiomm_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip); - size_t i; - static const size_t ports[] = { 0, 1, 2, 4, 5, 6 }; - const unsigned int gpio_reg_size = 8; - unsigned int bits_offset; - size_t word_index; - unsigned int word_offset; - unsigned long word_mask; - const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0); + unsigned long offset; + unsigned long gpio_mask; + unsigned int port_addr; unsigned long port_state; /* clear bits array to a clean slate */ bitmap_zero(bits, chip->ngpio); - /* get bits are evaluated a gpio port register at a time */ - for (i = 0; i < ARRAY_SIZE(ports); i++) { - /* gpio offset in bits array */ - bits_offset = i * gpio_reg_size; - - /* word index for bits array */ - word_index = BIT_WORD(bits_offset); - - /* gpio offset within current word of bits array */ - word_offset = bits_offset % BITS_PER_LONG; - - /* mask of get bits for current gpio within current word */ - word_mask = mask[word_index] & (port_mask << word_offset); - if (!word_mask) { - /* no get bits in this port so skip to next one */ - continue; - } - - /* read bits from current gpio port */ - port_state = inb(gpiommgpio->base + ports[i]); + for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { + port_addr = gpiommgpio->base + ports[offset / 8]; + port_state = inb(port_addr) & gpio_mask; - /* store acquired bits at respective bits array offset */ - bits[word_index] |= (port_state << word_offset) & word_mask; + bitmap_set_value8(bits, port_state, offset); } return 0; @@ -237,37 +216,27 @@ static void gpiomm_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip); - unsigned int i; - const unsigned int gpio_reg_size = 8; - unsigned int port; - unsigned int out_port; - unsigned int bitmask; + unsigned long offset; + unsigned long gpio_mask; + size_t index; + unsigned int port_addr; + unsigned long bitmask; unsigned long flags; - /* set bits are evaluated a gpio register size at a time */ - for (i = 0; i < chip->ngpio; i += gpio_reg_size) { - /* no more set bits in this mask word; skip to the next word */ - if (!mask[BIT_WORD(i)]) { - i = (BIT_WORD(i) + 1) * BITS_PER_LONG - gpio_reg_size; - continue; - } + for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { + index = offset / 8; + port_addr = gpiommgpio->base + ports[index]; - port = i / gpio_reg_size; - out_port = (port > 2) ? port + 1 : port; - bitmask = mask[BIT_WORD(i)] & bits[BIT_WORD(i)]; + bitmask = bitmap_get_value8(bits, offset) & gpio_mask; spin_lock_irqsave(&gpiommgpio->lock, flags); /* update output state data and set device gpio register */ - gpiommgpio->out_state[port] &= ~mask[BIT_WORD(i)]; - gpiommgpio->out_state[port] |= bitmask; - outb(gpiommgpio->out_state[port], gpiommgpio->base + out_port); + gpiommgpio->out_state[index] &= ~gpio_mask; + gpiommgpio->out_state[index] |= bitmask; + outb(gpiommgpio->out_state[index], port_addr); spin_unlock_irqrestore(&gpiommgpio->lock, flags); - - /* prepare for next gpio register set */ - mask[BIT_WORD(i)] >>= gpio_reg_size; - bits[BIT_WORD(i)] >>= gpio_reg_size; } } -- 2.7.4