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Sun, 24 Mar 2019 23:04:01 -0700 (PDT) From: William Breathitt Gray To: linus.walleij@linaro.org, bgolaszewski@baylibre.com Subject: [PATCH v11 06/11] gpio: ws16c48: Utilize for_each_set_clump8 macro Date: Mon, 25 Mar 2019 15:04:54 +0900 Message-Id: <186e263055b327f3333677db67f0ac4a3b428def.1553492741.git.vilhelm.gray@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190324_230402_860348_B0C3DBC9 X-CRM114-Status: GOOD ( 14.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, preid@electromag.com.au, yamada.masahiro@socionext.com, linux-pm@vger.kernel.org, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, William Breathitt Gray , linux-gpio@vger.kernel.org, geert@linux-m68k.org, akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Replace verbose implementation in get_multiple/set_multiple callbacks with for_each_set_clump8 macro to simplify code and improve clarity. Reviewed-by: Linus Walleij Signed-off-by: William Breathitt Gray --- drivers/gpio/gpio-ws16c48.c | 72 +++++++++++-------------------------- 1 file changed, 20 insertions(+), 52 deletions(-) diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c index 5cf3697bfb15..1d071a3d3e81 100644 --- a/drivers/gpio/gpio-ws16c48.c +++ b/drivers/gpio/gpio-ws16c48.c @@ -134,42 +134,19 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip); - const unsigned int gpio_reg_size = 8; - size_t i; - const size_t num_ports = chip->ngpio / gpio_reg_size; - 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 int 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 < num_ports; i++) { - /* gpio offset in bits array */ - bits_offset = i * gpio_reg_size; + for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) { + port_addr = ws16c48gpio->base + offset / 8; + port_state = inb(port_addr) & gpio_mask; - /* 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(ws16c48gpio->base + i); - - /* store acquired bits at respective bits array offset */ - bits[word_index] |= (port_state << word_offset) & word_mask; + bitmap_set_value8(bits, chip->ngpio, port_state, offset); } return 0; @@ -203,39 +180,30 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip); - unsigned int i; - const unsigned int gpio_reg_size = 8; - unsigned int port; - unsigned int iomask; + unsigned int offset; + unsigned long gpio_mask; + size_t index; + unsigned int port_addr; 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; + for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) { + index = offset / 8; + port_addr = ws16c48gpio->base + index; /* mask out GPIO configured for input */ - iomask = mask[BIT_WORD(i)] & ~ws16c48gpio->io_state[port]; - bitmask = iomask & bits[BIT_WORD(i)]; + gpio_mask &= ~ws16c48gpio->io_state[index]; + bitmask = bitmap_get_value8(bits, chip->ngpio, offset) & + gpio_mask; raw_spin_lock_irqsave(&ws16c48gpio->lock, flags); /* update output state data and set device gpio register */ - ws16c48gpio->out_state[port] &= ~iomask; - ws16c48gpio->out_state[port] |= bitmask; - outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port); + ws16c48gpio->out_state[index] &= ~gpio_mask; + ws16c48gpio->out_state[index] |= bitmask; + outb(ws16c48gpio->out_state[index], port_addr); raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags); - - /* prepare for next gpio register set */ - mask[BIT_WORD(i)] >>= gpio_reg_size; - bits[BIT_WORD(i)] >>= gpio_reg_size; } }