From: Syed Nayyar Waris <syednwaris@gmail.com>
To: akpm@linux-foundation.org
Cc: andriy.shevchenko@linux.intel.com, vilhelm.gray@gmail.com,
linus.walleij@linaro.org, bgolaszewski@baylibre.com,
michal.simek@xilinx.com, linux-gpio@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 4/4] gpio: xilinx: Utilize for_each_set_clump macro
Date: Wed, 29 Apr 2020 04:39:47 +0530 [thread overview]
Message-ID: <80745504d15c87aa1da0d4be3c16d1279f48615b.1588112716.git.syednwaris@gmail.com> (raw)
In-Reply-To: <cover.1588112714.git.syednwaris@gmail.com>
This patch reimplements the xgpio_set_multiple function in
drivers/gpio/gpio-xilinx.c to use the new for_each_set_clump macro.
Instead of looping for each bit in xgpio_set_multiple
function, now we can check each channel at a time and save cycles.
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
Changes in v3:
- No change.
Changes in v2:
- No change.
drivers/gpio/gpio-xilinx.c | 64 ++++++++++++++++++++------------------
1 file changed, 34 insertions(+), 30 deletions(-)
diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 67f9f82e0db0..428207f9ab91 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -136,39 +136,43 @@ static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
unsigned long *bits)
{
- unsigned long flags;
+ unsigned long flags[2];
struct xgpio_instance *chip = gpiochip_get_data(gc);
- int index = xgpio_index(chip, 0);
- int offset, i;
-
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
-
- /* Write to GPIO signals */
- for (i = 0; i < gc->ngpio; i++) {
- if (*mask == 0)
- break;
- /* Once finished with an index write it out to the register */
- if (index != xgpio_index(chip, i)) {
- xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
- index * XGPIO_CHANNEL_OFFSET,
- chip->gpio_state[index]);
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
- index = xgpio_index(chip, i);
- spin_lock_irqsave(&chip->gpio_lock[index], flags);
- }
- if (__test_and_clear_bit(i, mask)) {
- offset = xgpio_offset(chip, i);
- if (test_bit(i, bits))
- chip->gpio_state[index] |= BIT(offset);
- else
- chip->gpio_state[index] &= ~BIT(offset);
- }
+ u32 *const state = chip->gpio_state;
+ unsigned int *const width = chip->gpio_width;
+ const unsigned long state_size = BITS_PER_TYPE(*state);
+ unsigned long offset, clump;
+ size_t index;
+
+#define TOTAL_BITS BITS_PER_TYPE(chip->gpio_state)
+ DECLARE_BITMAP(old, TOTAL_BITS);
+ DECLARE_BITMAP(new, TOTAL_BITS);
+ DECLARE_BITMAP(changed, TOTAL_BITS);
+
+ spin_lock_irqsave(&chip->gpio_lock[0], flags[0]);
+ spin_lock_irqsave(&chip->gpio_lock[1], flags[1]);
+
+ bitmap_set_value(old, state[0], 0, width[0]);
+ bitmap_set_value(old, state[1], width[0], width[1]);
+ bitmap_replace(new, old, bits, mask, gc->ngpio);
+
+ bitmap_set_value(old, state[0], 0, state_size);
+ bitmap_set_value(old, state[1], state_size, state_size);
+ state[0] = bitmap_get_value(new, 0, width[0]);
+ state[1] = bitmap_get_value(new, width[0], width[1]);
+ bitmap_set_value(new, state[0], 0, state_size);
+ bitmap_set_value(new, state[1], state_size, state_size);
+ bitmap_xor(changed, old, new, TOTAL_BITS);
+
+ for_each_set_clump(offset, clump, changed, TOTAL_BITS, state_size) {
+ index = offset / state_size;
+ xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
+ index * XGPIO_CHANNEL_OFFSET,
+ state[index]);
}
- xgpio_writereg(chip->regs + XGPIO_DATA_OFFSET +
- index * XGPIO_CHANNEL_OFFSET, chip->gpio_state[index]);
-
- spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
+ spin_unlock_irqrestore(&chip->gpio_lock[1], flags[1]);
+ spin_unlock_irqrestore(&chip->gpio_lock[0], flags[0]);
}
/**
--
2.26.2
next prev parent reply other threads:[~2020-04-28 23:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 23:03 [PATCH v3 0/4] Introduce the for_each_set_clump macro Syed Nayyar Waris
2020-04-28 23:04 ` [PATCH v3 1/4] bitops: Introduce the " Syed Nayyar Waris
2020-04-28 23:05 ` [PATCH v3 2/4] lib/test_bitmap.c: Add for_each_set_clump test cases Syed Nayyar Waris
2020-04-29 10:16 ` Andy Shevchenko
2020-04-28 23:07 ` [PATCH v3 3/4] gpio: thunderx: Utilize for_each_set_clump macro Syed Nayyar Waris
2020-04-29 10:17 ` Andy Shevchenko
2020-04-30 16:22 ` Syed Nayyar Waris
2020-04-28 23:09 ` Syed Nayyar Waris [this message]
2020-04-29 10:21 ` [PATCH v3 4/4] gpio: xilinx: " Andy Shevchenko
2020-04-30 16:15 ` Syed Nayyar Waris
2020-04-30 16:38 ` Andy Shevchenko
2020-04-30 23:32 ` William Breathitt Gray
2020-05-01 13:32 ` Andy Shevchenko
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