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Message-Id: <12321862462894-git-send-email-jayakumar.lkml@gmail.com>
Date: Sat, 17 Jan 2009 17:57:18 +0800
From: Jaya Kumar <jayakumar.lkml@...il.com>
To: unlisted-recipients:; (no To-header on input)
Cc: David Brownell <david-b@...bell.net>,
Eric Miao <eric.miao@...vell.com>,
Paulius Zaleckas <paulius.zaleckas@...tonika.lt>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Sam Ravnborg <sam@...nborg.org>,
linux-arm-kernel@...ts.arm.linux.org.uk,
linux-fbdev-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
Jaya Kumar <jayakumar.lkml@...il.com>
Subject: [RFC 2.6.28 2/2] mach-pxa: add and use batch set/get gpio
This patch adds support for pxa specific batch set/get of gpio. This
is exported to gpiolib via the gpio_chip interface and then used within
am300epd.c
Cc: David Brownell <david-b@...bell.net>
Cc: Eric Miao <eric.miao@...vell.com>
Cc: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: linux-arm-kernel@...ts.arm.linux.org.uk
Cc: linux-fbdev-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Cc: linux-embedded@...r.kernel.org
Signed-off-by: Jaya Kumar <jayakumar.lkml@...il.com>
---
arch/arm/mach-pxa/Kconfig | 1 +
arch/arm/mach-pxa/am300epd.c | 23 ++++++------
arch/arm/mach-pxa/gpio.c | 63 +++++++++++++++++++++++++++++++++
arch/arm/mach-pxa/include/mach/gpio.h | 48 +++++++++++++++++++++++++
4 files changed, 124 insertions(+), 11 deletions(-)
diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index f844425..1b3e631 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -41,6 +41,7 @@ config GUMSTIX_AM200EPD
bool "Enable AM200EPD board support"
config GUMSTIX_AM300EPD
+ select GPIOLIB_BATCH
bool "Enable AM300EPD board support"
endchoice
diff --git a/arch/arm/mach-pxa/am300epd.c b/arch/arm/mach-pxa/am300epd.c
index 4bd10a1..c065368 100644
--- a/arch/arm/mach-pxa/am300epd.c
+++ b/arch/arm/mach-pxa/am300epd.c
@@ -187,24 +187,25 @@ static void am300_cleanup(struct broadsheetfb_par *par)
static u16 am300_get_hdb(struct broadsheetfb_par *par)
{
- u16 res = 0;
- int i;
-
- for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
- res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
+ int err;
+ u32 val;
- return res;
+ err = gpio_get_batch(DB0_GPIO_PIN, 0xFFFF, 16, &val);
+ if (err) {
+ dev_err(&am300_device->dev, "get failed: %d\n", err);
+ return 0;
+ }
+ return (u16) val;
}
static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
{
- int i;
-
- for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
- gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
+ int err;
+ err = gpio_set_batch(DB0_GPIO_PIN, data, 0xFFFF, 16);
+ if (err)
+ dev_err(&am300_device->dev, "set failed: %d\n", err);
}
-
static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
u8 state)
{
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
index 5fec1e4..46371a1 100644
--- a/arch/arm/mach-pxa/gpio.c
+++ b/arch/arm/mach-pxa/gpio.c
@@ -162,6 +162,67 @@ static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
__raw_writel(mask, pxa->regbase + GPCR_OFFSET);
}
+#ifdef CONFIG_GPIOLIB_BATCH
+/*
+ * Set output GPIO level in batches
+ */
+static int pxa_gpio_set_batch(struct gpio_chip *chip, unsigned offset,
+ u32 values, u32 bitmask, int width)
+{
+ struct pxa_gpio_chip *pxa;
+
+ /* we're guaranteed by the caller that offset + bitmask remains
+ * in this chip.
+ */
+ pxa = container_of(chip, struct pxa_gpio_chip, chip);
+
+ /* bitmask is used twice in shifted form */
+ bitmask <<= offset;
+
+ values = (values << offset) & bitmask;
+ if (values)
+ __raw_writel(values, pxa->regbase + GPSR_OFFSET);
+
+ values = ~values & bitmask;
+ if (values)
+ __raw_writel(values, pxa->regbase + GPCR_OFFSET);
+
+ return 0;
+}
+
+/*
+ * Get output GPIO level in batches
+ */
+static int pxa_gpio_get_batch(struct gpio_chip *chip, unsigned offset,
+ u32 bitmask, int width, u32 *result)
+{
+ u32 values;
+ struct pxa_gpio_chip *pxa;
+
+ /* we're guaranteed by the caller that offset + bitmask remains
+ * in this chip.
+ */
+ pxa = container_of(chip, struct pxa_gpio_chip, chip);
+
+ values = __raw_readl(pxa->regbase + GPLR_OFFSET);
+
+ /* shift the result back into original position */
+ *result = (values >> offset) & bitmask;
+ return 0;
+}
+#endif
+
+/* this is done this way so that we can insert an ifdef-able value
+ * into the following GPIO_CHIP macro
+ */
+#ifdef CONFIG_GPIOLIB_BATCH
+#define SET_BATCH_MACRO .set_batch = pxa_gpio_set_batch,
+#define GET_BATCH_MACRO .get_batch = pxa_gpio_get_batch,
+#else
+#define SET_BATCH_MACRO
+#define GET_BATCH_MACRO
+#endif
+
#define GPIO_CHIP(_n) \
[_n] = { \
.regbase = GPIO##_n##_BASE, \
@@ -173,6 +234,8 @@ static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
.set = pxa_gpio_set, \
.base = (_n) * 32, \
.ngpio = 32, \
+ SET_BATCH_MACRO \
+ GET_BATCH_MACRO \
}, \
}
diff --git a/arch/arm/mach-pxa/include/mach/gpio.h b/arch/arm/mach-pxa/include/mach/gpio.h
index 2c538d8..46d9022 100644
--- a/arch/arm/mach-pxa/include/mach/gpio.h
+++ b/arch/arm/mach-pxa/include/mach/gpio.h
@@ -56,6 +56,54 @@ static inline void gpio_set_value(unsigned gpio, int value)
}
}
+#ifdef CONFIG_GPIOLIB_BATCH
+static inline int gpio_set_batch(unsigned gpio, u32 values, u32 bitmask,
+ int bitwidth)
+{
+ int err = 0;
+ if (__builtin_constant_p(gpio) &&
+ (gpio + bitwidth < NR_BUILTIN_GPIO) &&
+ ((gpio + bitwidth) <= roundup(gpio+1, 32))) {
+ int shift;
+
+ shift = gpio % 32;
+ bitmask <<= shift;
+
+ values = (values << shift) & bitmask;
+ if (values)
+ GPSR(gpio) = values;
+
+ values = ~values & bitmask;
+ if (values)
+ GPCR(gpio) = values;
+ } else {
+ err = __gpio_set_batch(gpio, values, bitmask, bitwidth);
+ }
+ return err;
+}
+
+static inline int gpio_get_batch(unsigned gpio, u32 bitmask, int bitwidth,
+ u32 *result)
+{
+ int ret = 0;
+ if (__builtin_constant_p(gpio) &&
+ (gpio + bitwidth < NR_BUILTIN_GPIO) &&
+ ((gpio + bitwidth) <= roundup(gpio+1, 32))) {
+ int shift;
+ u32 values;
+
+ shift = gpio % 32;
+
+ values = GPLR(gpio);
+
+ *result = (values >> shift) & bitmask;
+ } else {
+ ret = __gpio_get_batch(gpio, bitmask, bitwidth, result);
+ }
+ return ret;
+}
+#endif
+
#define gpio_cansleep __gpio_cansleep
#define gpio_to_irq(gpio) IRQ_GPIO(gpio)
--
1.5.2.3
--
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