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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@gmail.com
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Cc: Morten Hein Tiljeset <morten.tiljeset@prevas.dk>
Cc: Phil Reid <preid@electromag.com.au>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
William Breathitt Gray 2019-12-04 16:51:18 -08:00 committed by Linus Torvalds
parent acebb82fe9
commit 2dc7c3c16d
1 changed files with 29 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
drivers/gpio/gpio-pci-idio-16.c
View File

@ -100,45 +100,23 @@ 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 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;
for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
port_addr = ports[offset / 8];
port_state = ioread8(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 = ioread8(ports[i]);
/* 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(struct gpio_chip *chip,
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;
raw_spin_lock_irqsave(&idio16gpio->lock, flags);
out_state = ioread8(port_addr) & ~gpio_mask;
out_state |= bitmask;
iowrite8(out_state, port_addr);
raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
}
/* shift to next output line word */
*mask >>= 8;
/* 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);
}
static void idio_16_irq_ack(struct irq_data *data)