From: William Breathitt Gray <vilhelm.gray@xxxxxxxxx> Subject: gpio: pci-idio-16: 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/b30f131b4634caf5a70f12e01496f71631a17305.1570641097.git.vilhelm.gray@xxxxxxxxx Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Cc: Lukas Wunner <lukas@xxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: Mathias Duckeck <m.duckeck@xxxxxxxxx> Cc: Morten Hein Tiljeset <morten.tiljeset@xxxxxxxxx> Cc: Phil Reid <preid@xxxxxxxxxxxxxxxxx> Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> Cc: Sean Nyekjaer <sean.nyekjaer@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/gpio/gpio-pci-idio-16.c | 75 ++++++++++-------------------- 1 file changed, 27 insertions(+), 48 deletions(-) --- a/drivers/gpio/gpio-pci-idio-16.c~gpio-pci-idio-16-utilize-for_each_set_clump8-macro +++ a/drivers/gpio/gpio-pci-idio-16.c @@ -100,45 +100,23 @@ static int idio_16_gpio_get_multiple(str 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 long offset; + unsigned long gpio_mask; void __iomem *ports[] = { &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, &idio16gpio->reg->in0_7, &idio16gpio->reg->in8_15, }; + 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; - - /* 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]); + for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { + port_addr = ports[offset / 8]; + port_state = ioread8(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; @@ -178,30 +156,31 @@ static void idio_16_gpio_set_multiple(st unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); + unsigned long offset; + unsigned long gpio_mask; + void __iomem *ports[] = { + &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, + }; + size_t index; + void __iomem *port_addr; + unsigned long bitmask; unsigned long flags; - unsigned int out_state; + unsigned long out_state; - raw_spin_lock_irqsave(&idio16gpio->lock, flags); + for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { + 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, offset) & gpio_mask; - /* shift to next output line word */ - *mask >>= 8; + raw_spin_lock_irqsave(&idio16gpio->lock, flags); - /* 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); - } + out_state = ioread8(port_addr) & ~gpio_mask; + out_state |= bitmask; + iowrite8(out_state, port_addr); - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); + raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); + } } static void idio_16_irq_ack(struct irq_data *data) _
