From mboxrd@z Thu Jan 1 00:00:00 1970 From: William Breathitt Gray Subject: [PATCH v4 3/8] gpio: 104-dio-48e: Utilize for_each_set_clump macro Date: Tue, 15 May 2018 12:22:48 -0400 Message-ID: <3c9de7a04c7b02555067d17d55956bdb0365ae50.1526400945.git.vilhelm.gray@gmail.com> References: Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: linus.walleij@linaro.org Cc: linux-gpio@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, William Breathitt Gray List-Id: linux-gpio@vger.kernel.org Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump macro to simplify code and improve clarity. Signed-off-by: William Breathitt Gray --- drivers/gpio/gpio-104-dio-48e.c | 67 ++++++++------------------------- 1 file changed, 16 insertions(+), 51 deletions(-) diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c index 9c4e07fcb74b..77eeaa36094c 100644 --- a/drivers/gpio/gpio-104-dio-48e.c +++ b/drivers/gpio/gpio-104-dio-48e.c @@ -183,46 +183,23 @@ static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset) return !!(port_state & mask); } +static const size_t ports[] = { 0, 1, 2, 4, 5, 6 }; + static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct dio48e_gpio *const dio48egpio = 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); + size_t word; + unsigned int offset; 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 */ + for_each_set_clump(i, word, offset, mask, ARRAY_SIZE(ports), 8) { port_state = inb(dio48egpio->base + ports[i]); - - /* store acquired bits at respective bits array offset */ - bits[word_index] |= port_state << word_offset; + bits[word] |= port_state << offset; } return 0; @@ -252,37 +229,25 @@ static void dio48e_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); - unsigned int i; - const unsigned int gpio_reg_size = 8; - unsigned int port; - unsigned int out_port; + size_t i; + size_t word; + unsigned int offset; + unsigned int iomask; unsigned int 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; - } - - port = i / gpio_reg_size; - out_port = (port > 2) ? port + 1 : port; - bitmask = mask[BIT_WORD(i)] & bits[BIT_WORD(i)]; + for_each_set_clump(i, word, offset, mask, ARRAY_SIZE(ports), 8) { + iomask = mask[word] >> offset; + bitmask = iomask & (bits[word] >> offset); raw_spin_lock_irqsave(&dio48egpio->lock, flags); /* update output state data and set device gpio register */ - dio48egpio->out_state[port] &= ~mask[BIT_WORD(i)]; - dio48egpio->out_state[port] |= bitmask; - outb(dio48egpio->out_state[port], dio48egpio->base + out_port); + dio48egpio->out_state[i] &= ~iomask; + dio48egpio->out_state[i] |= bitmask; + outb(dio48egpio->out_state[i], dio48egpio->base + ports[i]); raw_spin_unlock_irqrestore(&dio48egpio->lock, flags); - - /* prepare for next gpio register set */ - mask[BIT_WORD(i)] >>= gpio_reg_size; - bits[BIT_WORD(i)] >>= gpio_reg_size; } } -- 2.17.0