From: rmk+kernel@armlinux.org.uk (Russell King)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver
Date: Mon, 29 Aug 2016 11:24:31 +0100 [thread overview]
Message-ID: <E1beJjz-0000mA-0o@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <20160829102328.GA28796@n2100.armlinux.org.uk>
Add a simple, generic, single register fixed-direction GPIO driver.
This is able to support a single register where a fixed number of
bits are used for input and a fixed number of bits used for output.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-reg.c | 139 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/gpio-reg.h | 12 ++++
4 files changed, 158 insertions(+)
create mode 100644 drivers/gpio/gpio-reg.c
create mode 100644 include/linux/gpio-reg.h
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 98dd47a30fc7..49bd8b89712e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -365,6 +365,12 @@ config GPIO_RCAR
help
Say yes here to support GPIO on Renesas R-Car SoCs.
+config GPIO_REG
+ bool
+ help
+ A 32-bit single register GPIO fixed in/out implementation. This
+ can be used to represent any register as a set of GPIO signals.
+
config GPIO_SPEAR_SPICS
bool "ST SPEAr13xx SPI Chip Select as GPIO support"
depends on PLAT_SPEAR
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 2a035ed8f168..3fc904fcc595 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -88,6 +88,7 @@ obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
obj-$(CONFIG_GPIO_RCAR) += gpio-rcar.o
+obj-$(CONFIG_GPIO_REG) += gpio-reg.o
obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
obj-$(CONFIG_GPIO_SCH) += gpio-sch.o
obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o
diff --git a/drivers/gpio/gpio-reg.c b/drivers/gpio/gpio-reg.c
new file mode 100644
index 000000000000..fc7e0a395f9f
--- /dev/null
+++ b/drivers/gpio/gpio-reg.c
@@ -0,0 +1,139 @@
+#include <linux/gpio/driver.h>
+#include <linux/gpio-reg.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+struct gpio_reg {
+ struct gpio_chip gc;
+ spinlock_t lock;
+ u32 direction;
+ u32 out;
+ void __iomem *reg;
+};
+
+#define to_gpio_reg(x) container_of(x, struct gpio_reg, gc)
+
+static int gpio_reg_get_direction(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+
+ return r->direction & BIT(offset) ? 1 : 0;
+}
+
+static int gpio_reg_direction_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+
+ if (r->direction & BIT(offset))
+ return -ENOTSUPP;
+
+ gc->set(gc, offset, value);
+ return 0;
+}
+
+static int gpio_reg_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+
+ return r->direction & BIT(offset) ? 0 : -ENOTSUPP;
+}
+
+static void gpio_reg_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+ unsigned long flags;
+ u32 val, mask = BIT(offset);
+
+ spin_lock_irqsave(&r->lock, flags);
+ val = r->out;
+ if (value)
+ val |= mask;
+ else
+ val &= ~mask;
+ r->out = val;
+ writel_relaxed(val, r->reg);
+ spin_unlock_irqrestore(&r->lock, flags);
+}
+
+static int gpio_reg_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+ u32 val, mask = BIT(offset);
+
+ if (r->direction & mask) {
+ /*
+ * double-read the value, some registers latch after the
+ * first read.
+ */
+ readl_relaxed(r->reg);
+ val = readl_relaxed(r->reg);
+ } else {
+ val = r->out;
+ }
+ return !!(val & mask);
+}
+
+static void gpio_reg_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&r->lock, flags);
+ r->out = (r->out & ~*mask) | *bits;
+ writel_relaxed(r->out, r->reg);
+ spin_unlock_irqrestore(&r->lock, flags);
+}
+
+struct gpio_chip *gpio_reg_init(struct device *dev, void __iomem *reg,
+ int base, int num, const char *label, u32 direction, u32 def_out,
+ const char *const *names)
+{
+ struct gpio_reg *r;
+ int ret;
+
+ if (dev)
+ r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);
+ else
+ r = kzalloc(sizeof(*r), GFP_KERNEL);
+
+ if (!r)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&r->lock);
+
+ r->gc.label = label;
+ r->gc.get_direction = gpio_reg_get_direction;
+ r->gc.direction_input = gpio_reg_direction_input;
+ r->gc.direction_output = gpio_reg_direction_output;
+ r->gc.set = gpio_reg_set;
+ r->gc.get = gpio_reg_get;
+ r->gc.set_multiple = gpio_reg_set_multiple;
+ r->gc.base = base;
+ r->gc.ngpio = num;
+ r->gc.names = names;
+ r->direction = direction;
+ r->out = def_out;
+ r->reg = reg;
+
+ if (dev)
+ ret = devm_gpiochip_add_data(dev, &r->gc, r);
+ else
+ ret = gpiochip_add_data(&r->gc, r);
+
+ return ret ? ERR_PTR(ret) : &r->gc;
+}
+
+int gpio_reg_resume(struct gpio_chip *gc)
+{
+ struct gpio_reg *r = to_gpio_reg(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&r->lock, flags);
+ writel_relaxed(r->out, r->reg);
+ spin_unlock_irqrestore(&r->lock, flags);
+
+ return 0;
+}
diff --git a/include/linux/gpio-reg.h b/include/linux/gpio-reg.h
new file mode 100644
index 000000000000..0352bec7319a
--- /dev/null
+++ b/include/linux/gpio-reg.h
@@ -0,0 +1,12 @@
+#ifndef GPIO_REG_H
+#define GPIO_REG_H
+
+struct device;
+
+struct gpio_chip *gpio_reg_init(struct device *dev, void __iomem *reg,
+ int base, int num, const char *label, u32 direction, u32 def_out,
+ const char *const *names);
+
+int gpio_reg_resume(struct gpio_chip *gc);
+
+#endif
--
2.1.0
next prev parent reply other threads:[~2016-08-29 10:24 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-29 10:02 [PATCH 0/3] SA11x0/PXA pcmcia fixes Russell King - ARM Linux
2016-08-29 10:03 ` [PATCH 1/3] pcmcia: sa11xx_base: fix reporting of timing information Russell King
2016-08-29 10:03 ` [PATCH 2/3] pcmcia: sa11xx_base: add units to the " Russell King
2016-08-29 10:03 ` [PATCH 3/3] pcmcia: soc_common: fix SS_STSCHG polarity Russell King
2016-08-29 10:23 ` [RFC PATCH 00/33] SA11x0/PXA GPIO rework (Core + PCMCIA only) Russell King - ARM Linux
2016-08-29 10:24 ` [PATCH 01/33] gpio: sa1100: fix irq probing for ucb1x00 Russell King
2016-09-07 22:25 ` Linus Walleij
2016-08-29 10:24 ` [PATCH 02/33] gpio: sa1100: use sa11x0_gpio_set_wake() Russell King
2016-08-29 10:24 ` [PATCH 03/33] gpio: sa1100: convert to use IO accessors Russell King
2016-08-29 10:24 ` [PATCH 04/33] gpio: sa1100: implement get_direction method Russell King
2016-08-29 10:24 ` Russell King [this message]
2016-08-29 19:39 ` [PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver Robert Jarzmik
2016-08-29 23:12 ` Russell King - ARM Linux
2016-08-30 6:08 ` Alexander Shiyan
2016-08-30 7:41 ` Russell King - ARM Linux
2016-08-30 9:18 ` Russell King - ARM Linux
2016-08-30 16:42 ` Robert Jarzmik
2016-08-30 18:46 ` Russell King - ARM Linux
2016-08-30 21:32 ` Robert Jarzmik
2016-08-31 8:49 ` Russell King - ARM Linux
2016-08-31 10:27 ` Russell King - ARM Linux
2016-09-01 7:19 ` Robert Jarzmik
2016-09-01 9:27 ` Russell King - ARM Linux
2016-09-01 21:58 ` Robert Jarzmik
2016-09-01 23:02 ` Russell King - ARM Linux
2016-09-02 17:50 ` Robert Jarzmik
2016-09-02 18:56 ` Russell King - ARM Linux
2016-09-02 21:21 ` Robert Jarzmik
2016-09-02 23:34 ` Russell King - ARM Linux
2016-09-03 9:15 ` Russell King - ARM Linux
2016-09-03 9:09 ` Russell King - ARM Linux
2016-09-03 10:25 ` Russell King - ARM Linux
2016-09-03 11:31 ` Robert Jarzmik
2016-09-04 19:04 ` Robert Jarzmik
2016-09-04 20:18 ` Russell King - ARM Linux
2016-09-05 9:06 ` Linus Walleij
2016-09-05 12:26 ` Russell King - ARM Linux
2016-09-08 13:21 ` Linus Walleij
2016-09-14 8:50 ` Linus Walleij
2016-08-30 21:25 ` Linus Walleij
2016-08-30 21:42 ` Russell King - ARM Linux
2016-08-30 21:47 ` Linus Walleij
2016-09-02 17:00 ` Russell King - ARM Linux
2016-09-04 20:53 ` Linus Walleij
2016-08-29 10:24 ` [PATCH 06/33] ARM: pxa/lubbock: add GPIO driver for LUB_MISC_WR register Russell King
2016-08-29 19:57 ` Robert Jarzmik
2016-08-29 22:58 ` Russell King - ARM Linux
2016-08-29 10:24 ` [PATCH 07/33] ARM: sa1100/assabet: add BCR/BSR GPIO driver Russell King
2016-08-29 10:24 ` [PATCH 08/33] ARM: sa1100/neponset: add GPIO drivers for control and modem registers Russell King
2016-08-29 10:24 ` [PATCH 09/33] ARM: sa1111: implement a gpio_chip for SA1111 GPIOs Russell King
2016-08-29 10:24 ` [PATCH 10/33] pcmcia: soc_common: switch to using gpio_descs Russell King
2016-09-14 11:29 ` Linus Walleij
2016-09-14 12:10 ` Russell King - ARM Linux
2016-08-29 10:25 ` [PATCH 11/33] pcmcia: soc_common: request legacy detect GPIO with active low Russell King
2016-08-29 10:25 ` [PATCH 12/33] pcmcia: soc_common: add support for reset and bus enable GPIOs Russell King
2016-08-29 10:25 ` [PATCH 13/33] pcmcia: soc_common: restore previous socket state on error Russell King
2016-08-29 10:25 ` [PATCH 14/33] pcmcia: soc_common: add CF socket state helper Russell King
2016-08-29 10:25 ` [PATCH 15/33] pcmcia: soc_common: add support for Vcc and Vpp regulators Russell King
2016-08-29 10:25 ` [PATCH 16/33] pcmcia: soc_common: switch to a per-socket cpufreq notifier Russell King
2016-08-29 10:25 ` [PATCH 17/33] pcmcia: soc_common: constify pcmcia_low_level ops pointer Russell King
2016-08-29 10:25 ` [PATCH 18/33] pcmcia: sa1100: provide generic CF support Russell King
2016-09-14 8:52 ` Linus Walleij
2016-09-14 9:06 ` Russell King - ARM Linux
2016-09-14 11:13 ` Linus Walleij
2016-08-29 10:25 ` [PATCH 19/33] pcmcia: sa1111: add driver-data pointer Russell King
2016-08-29 10:25 ` [PATCH 20/33] pcmcia: add MAX1600 driver Russell King
2016-08-29 10:25 ` [PATCH 21/33] ARM: sa1100: provide infrastructure to support generic CF sockets Russell King
2016-08-29 10:25 ` [PATCH 22/33] ARM: sa1100/assabet: convert to " Russell King
2016-08-29 10:26 ` [PATCH 23/33] ARM: sa1100/cerf: " Russell King
2016-08-29 10:26 ` [PATCH 24/33] ARM: sa1100/h3xxx: switch h3xxx PCMCIA to use gpiod APIs Russell King
2016-08-29 10:26 ` [PATCH 25/33] ARM: sa1100/nanoengine: convert to generic CF sockets Russell King
2016-08-29 10:26 ` [PATCH 26/33] ARM: sa1100/shannon: switch shannon PCMCIA to use gpiod APIs Russell King
2016-08-29 10:26 ` [PATCH 27/33] ARM: sa1100/simpad: switch simpad CF " Russell King
2016-08-29 10:26 ` [PATCH 28/33] ARM: sa1100/neponset: add GPIOs for PCMCIA Russell King
2016-08-29 10:26 ` [PATCH 29/33] pcmcia: sa1111/neponset: convert to use MAX1600 power driver Russell King
2016-08-29 10:26 ` [PATCH 30/33] ARM: sa1100/jornada720: switch jornada720 PCMCIA to gpiod APIs Russell King
2016-08-29 10:26 ` [PATCH 31/33] ARM: pxa/lubbock: convert PCMCIA to use MAX1600 driver Russell King
2016-08-29 10:26 ` [PATCH 32/33] pcmcia: sa1100*: remove redundant bvd1/bvd2 setting Russell King
2016-08-29 10:26 ` [PATCH 33/33] ARM: sa1111: remove legacy GPIO interfaces Russell King
2016-08-29 11:01 ` [PATCH 0/3] SA11x0 gpio keys/leds Russell King - ARM Linux
2016-08-29 11:03 ` [PATCH 1/3] ARM: sa1100/assabet: add gpio keys support for right-hand two buttons Russell King
2016-08-29 11:03 ` [PATCH 2/3] ARM: sa1100/assabet: switch to using gpio leds Russell King
2016-08-29 11:03 ` [PATCH 3/3] ARM: sa1100/cerf: switch to using gpio_led_register_device() Russell King
2016-08-29 11:25 ` [PATCH 0/8] SA11x0 DMA engine/IrDA updates Russell King - ARM Linux
2016-08-29 11:26 ` [PATCH 1/8] dmaengine: sa11x0: add DMA filters Russell King
2016-08-30 15:57 ` Vinod Koul
2016-08-29 11:26 ` [PATCH 2/8] net: irda/sa1100_ir: convert to dma_request_slave_channel() Russell King
2016-08-29 11:26 ` [PATCH 3/8] net: irda/sa1100_ir: add gpiod APIs for controlling IrDA transceiver Russell King
2016-08-29 11:26 ` [PATCH 4/8] dmaengine: sa11x0: unexport sa11x0_dma_filter_fn and clean up Russell King
2016-08-30 15:58 ` Vinod Koul
2016-08-29 11:26 ` [PATCH 5/8] ARM: sa1100/assabet: switch assabet IrDA to use gpiod APIs Russell King
2016-08-29 11:26 ` [PATCH 6/8] ARM: sa1100/collie: switch collie " Russell King
2016-08-29 11:26 ` [PATCH 7/8] ARM: sa1100/h3xxx: switch h3xxx " Russell King
2016-08-29 11:26 ` [PATCH 8/8] net: irda/sa1100_ir: remove sa11x0 irda platform data Russell King
2016-08-29 12:05 ` [PATCH 0/6] SA11x0 serial updates Russell King - ARM Linux
2016-08-29 12:05 ` [PATCH 1/6] serial: sa1100: add support for mctrl gpios Russell King
2016-08-31 13:25 ` Greg Kroah-Hartman
2016-08-29 12:05 ` [PATCH 2/6] ARM: sa1100/assabet: convert serial to gpiod APIs Russell King
2016-08-29 12:06 ` [PATCH 3/6] ARM: sa1100/h3xxx: " Russell King
2016-08-29 12:06 ` [PATCH 4/6] ARM: sa1100/badge4: remove commented out modem control initialisers Russell King
2016-08-29 12:06 ` [PATCH 5/6] ARM: sa1100/hackkit: remove empty serial mctrl functions Russell King
2016-08-29 12:06 ` [PATCH 6/6] ARM: sa1100/neponset: convert serial to use gpiod APIs Russell King
2016-08-30 10:51 ` [PATCH 0/4] SA11x0 Clocks and removal of Neponset SMC91x hack Russell King - ARM Linux
2016-08-30 10:52 ` [PATCH 1/4] ARM: sa1100: convert to common clock framework Russell King
2016-08-30 10:52 ` [PATCH 2/4] net: smc91x: add external clock support Russell King
2016-08-30 10:52 ` [PATCH 3/4] ARM: sa1100/neponset: add ethernet oscillator Russell King
2016-08-30 10:52 ` [PATCH 4/4] net: smc91x: remove neponset specific oscillator hack Russell King
2016-08-30 10:59 ` [PATCH 0/8] SA11x0/PXA remainder & cleanups Russell King - ARM Linux
2016-08-30 11:00 ` [PATCH 1/8] mfd: ucb1x00: allow IRQ probing to work with IRQs > 32 Russell King
2016-08-30 12:00 ` Lee Jones
2016-08-30 11:00 ` [PATCH 2/8] ARM: pxa/lubbock: remove lubbock_set_misc_wr() from global view Russell King
2016-08-30 11:00 ` [PATCH 3/8] ARM: sa1100/cerf: remove redundant definitions Russell King
2016-08-30 11:00 ` [PATCH 4/8] ARM: sa1100/cerf: move cerf header file Russell King
2016-08-30 11:00 ` [PATCH 5/8] ARM: sa1100/nanoengine: remove redundant definitions Russell King
2016-08-30 11:00 ` [PATCH 6/8] ARM: sa1100/nanoengine: move nanoengine header file Russell King
2016-08-30 11:00 ` [PATCH 7/8] ARM: sa1100/neponset: remove neponset_ncr_* GPIO interfaces and header Russell King
2016-08-30 11:01 ` [PATCH 8/8] ARM: sa1100: remove SA-1101 header file Russell King
2016-08-30 15:31 ` [PATCH 0/4] SA11x0 Clocks and removal of Neponset SMC91x hack Nicolas Pitre
2016-09-01 23:32 ` David Miller
2016-09-02 18:59 ` Russell King - ARM Linux
2016-09-05 9:09 ` [PATCH 0/6] SA11x0 serial updates Linus Walleij
2016-09-05 12:28 ` Russell King - ARM Linux
2016-09-07 22:28 ` Linus Walleij
2016-09-08 13:23 ` Linus Walleij
2016-08-30 21:31 ` [RFC PATCH 00/33] SA11x0/PXA GPIO rework (Core + PCMCIA only) Linus Walleij
2016-09-01 15:34 ` Russell King - ARM Linux
2016-09-06 14:46 ` [PATCH 0/3] SA11x0/PXA pcmcia fixes Russell King - ARM Linux
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