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Sun, 24 Mar 2019 23:04:31 -0700 (PDT) From: William Breathitt Gray To: linus.walleij@linaro.org, bgolaszewski@baylibre.com Subject: [PATCH v11 07/11] gpio: pci-idio-16: Utilize for_each_set_clump8 macro Date: Mon, 25 Mar 2019 15:05:16 +0900 Message-Id: <4405d4ee08f03855d5884f89e834c6f1c88b26bf.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_230432_738386_FE38458C X-CRM114-Status: GOOD ( 15.01 ) 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-pci-idio-16.c | 75 ++++++++++++--------------------- 1 file changed, 28 insertions(+), 47 deletions(-) diff --git a/drivers/gpio/gpio-pci-idio-16.c b/drivers/gpio/gpio-pci-idio-16.c index 6b7349783223..b0ed6bb68296 100644 --- a/drivers/gpio/gpio-pci-idio-16.c +++ b/drivers/gpio/gpio-pci-idio-16.c @@ -108,45 +108,24 @@ static int idio_16_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - size_t i; - 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 port_state; + unsigned int offset; + unsigned long gpio_mask; void __iomem *ports[] = { &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, &idio16gpio->reg->in0_7, &idio16gpio->reg->in8_15, }; + const unsigned int ngpio = ARRAY_SIZE(ports) * 8; + void __iomem *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; + for_each_set_clump8(offset, gpio_mask, mask, ngpio) { + port_addr = ports[offset / 8]; + port_state = ioread8(port_addr) & gpio_mask; - /* 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 = ioread8(ports[i]); - - /* store acquired bits at respective bits array offset */ - bits[word_index] |= (port_state << word_offset) & word_mask; + bitmap_set_value8(bits, ngpio, port_state, offset); } return 0; @@ -186,30 +165,32 @@ static void idio_16_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); + unsigned int offset; + unsigned long gpio_mask; + void __iomem *ports[] = { + &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, + }; + const unsigned int ngpio = ARRAY_SIZE(ports) * 8; + size_t index; + void __iomem *port_addr; + unsigned int bitmask; unsigned long flags; unsigned int out_state; - raw_spin_lock_irqsave(&idio16gpio->lock, flags); + for_each_set_clump8(offset, gpio_mask, mask, ngpio) { + index = offset / 8; + port_addr = ports[index]; - /* process output lines 0-7 */ - if (*mask & 0xFF) { - out_state = ioread8(&idio16gpio->reg->out0_7) & ~*mask; - out_state |= *mask & *bits; - iowrite8(out_state, &idio16gpio->reg->out0_7); - } + bitmask = bitmap_get_value8(bits, ngpio, offset) & gpio_mask; + + raw_spin_lock_irqsave(&idio16gpio->lock, flags); - /* shift to next output line word */ - *mask >>= 8; + out_state = ioread8(port_addr) & ~gpio_mask; + out_state |= bitmask; + iowrite8(out_state, port_addr); - /* process output lines 8-15 */ - if (*mask & 0xFF) { - *bits >>= 8; - out_state = ioread8(&idio16gpio->reg->out8_15) & ~*mask; - out_state |= *mask & *bits; - iowrite8(out_state, &idio16gpio->reg->out8_15); + raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); } - - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); } static void idio_16_irq_ack(struct irq_data *data)