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Date: Wed, 31 Jul 2019 21:56:47 +0200
From: Arnd Bergmann <arnd@...db.de>
To: soc@...nel.org, linux-arm-kernel@...ts.infradead.org,
Vladimir Zapolskiy <vz@...ia.com>,
Sylvain Lemieux <slemieux.tyco@...il.com>,
Russell King <linux@...linux.org.uk>,
Gregory Clement <gregory.clement@...tlin.com>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc: Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>,
Guenter Roeck <linux@...ck-us.net>, linux-gpio@...r.kernel.org,
netdev@...r.kernel.org, linux-serial@...r.kernel.org,
linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>,
Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 05/14] gpio: lpc32xx: allow building on non-lpc32xx targets
The driver uses hardwire MMIO addresses instead of the data
that is passed in device tree. Change it over to only
hardcode the register offset values and allow compile-testing.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
drivers/gpio/Kconfig | 8 +++++
drivers/gpio/Makefile | 2 +-
drivers/gpio/gpio-lpc32xx.c | 63 ++++++++++++++++++++++++-------------
3 files changed, 50 insertions(+), 23 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index bb13c266c329..ae86ee963eae 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -311,6 +311,14 @@ config GPIO_LPC18XX
Select this option to enable GPIO driver for
NXP LPC18XX/43XX devices.
+config GPIO_LPC32XX
+ tristate "NXP LPC32XX GPIO support"
+ default ARCH_LPC32XX
+ depends on OF_GPIO && (ARCH_LPC32XX || COMPILE_TEST)
+ help
+ Select this option to enable GPIO driver for
+ NXP LPC32XX devices.
+
config GPIO_LYNXPOINT
tristate "Intel Lynxpoint GPIO support"
depends on ACPI && X86
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index a4e91175c708..87d659ae95eb 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -74,7 +74,7 @@ obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o
obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o
obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o
-obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o
+obj-$(CONFIG_GPIO_LPC32XX) += gpio-lpc32xx.o
obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o
obj-$(CONFIG_GPIO_MADERA) += gpio-madera.o
obj-$(CONFIG_GPIO_MAX3191X) += gpio-max3191x.o
diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c
index 24885b3db3d5..548f7cb69386 100644
--- a/drivers/gpio/gpio-lpc32xx.c
+++ b/drivers/gpio/gpio-lpc32xx.c
@@ -16,8 +16,7 @@
#include <linux/platform_device.h>
#include <linux/module.h>
-#include <mach/hardware.h>
-#include <mach/platform.h>
+#define _GPREG(x) (x)
#define LPC32XX_GPIO_P3_INP_STATE _GPREG(0x000)
#define LPC32XX_GPIO_P3_OUTP_SET _GPREG(0x004)
@@ -72,12 +71,12 @@
#define LPC32XX_GPO_P3_GRP (LPC32XX_GPI_P3_GRP + LPC32XX_GPI_P3_MAX)
struct gpio_regs {
- void __iomem *inp_state;
- void __iomem *outp_state;
- void __iomem *outp_set;
- void __iomem *outp_clr;
- void __iomem *dir_set;
- void __iomem *dir_clr;
+ unsigned long inp_state;
+ unsigned long outp_state;
+ unsigned long outp_set;
+ unsigned long outp_clr;
+ unsigned long dir_set;
+ unsigned long dir_clr;
};
/*
@@ -167,14 +166,26 @@ struct lpc32xx_gpio_chip {
struct gpio_regs *gpio_grp;
};
+void __iomem *gpio_reg_base;
+
+static inline u32 gpreg_read(unsigned long offset)
+{
+ return __raw_readl(gpio_reg_base + offset);
+}
+
+static inline void gpreg_write(u32 val, unsigned long offset)
+{
+ __raw_writel(val, gpio_reg_base + offset);
+}
+
static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group,
unsigned pin, int input)
{
if (input)
- __raw_writel(GPIO012_PIN_TO_BIT(pin),
+ gpreg_write(GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->dir_clr);
else
- __raw_writel(GPIO012_PIN_TO_BIT(pin),
+ gpreg_write(GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->dir_set);
}
@@ -184,19 +195,19 @@ static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group,
u32 u = GPIO3_PIN_TO_BIT(pin);
if (input)
- __raw_writel(u, group->gpio_grp->dir_clr);
+ gpreg_write(u, group->gpio_grp->dir_clr);
else
- __raw_writel(u, group->gpio_grp->dir_set);
+ gpreg_write(u, group->gpio_grp->dir_set);
}
static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group,
unsigned pin, int high)
{
if (high)
- __raw_writel(GPIO012_PIN_TO_BIT(pin),
+ gpreg_write(GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->outp_set);
else
- __raw_writel(GPIO012_PIN_TO_BIT(pin),
+ gpreg_write(GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->outp_clr);
}
@@ -206,31 +217,31 @@ static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group,
u32 u = GPIO3_PIN_TO_BIT(pin);
if (high)
- __raw_writel(u, group->gpio_grp->outp_set);
+ gpreg_write(u, group->gpio_grp->outp_set);
else
- __raw_writel(u, group->gpio_grp->outp_clr);
+ gpreg_write(u, group->gpio_grp->outp_clr);
}
static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group,
unsigned pin, int high)
{
if (high)
- __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
+ gpreg_write(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
else
- __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
+ gpreg_write(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
}
static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group,
unsigned pin)
{
- return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state),
+ return GPIO012_PIN_IN_SEL(gpreg_read(group->gpio_grp->inp_state),
pin);
}
static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
unsigned pin)
{
- int state = __raw_readl(group->gpio_grp->inp_state);
+ int state = gpreg_read(group->gpio_grp->inp_state);
/*
* P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
@@ -242,13 +253,13 @@ static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group,
unsigned pin)
{
- return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
+ return GPI3_PIN_IN_SEL(gpreg_read(group->gpio_grp->inp_state), pin);
}
static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
unsigned pin)
{
- return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
+ return GPO3_PIN_IN_SEL(gpreg_read(group->gpio_grp->outp_state), pin);
}
/*
@@ -498,6 +509,10 @@ static int lpc32xx_gpio_probe(struct platform_device *pdev)
{
int i;
+ gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (gpio_reg_base)
+ return -ENXIO;
+
for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
if (pdev->dev.of_node) {
lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
@@ -527,3 +542,7 @@ static struct platform_driver lpc32xx_gpio_driver = {
};
module_platform_driver(lpc32xx_gpio_driver);
+
+MODULE_AUTHOR("Kevin Wells <kevin.wells@....com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("GPIO driver for LPC32xx SoC");
--
2.20.0
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