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gpio: lpc32xx: allow building on non-lpc32xx targets
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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.

Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Tested-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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Arnd Bergmann authored and Bartosz Golaszewski committed Aug 12, 2019
1 parent f4160fa commit f2ee731
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Showing 4 changed files with 77 additions and 51 deletions.
1 change: 1 addition & 0 deletions arch/arm/configs/lpc32xx_defconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ CONFIG_SERIAL_HS_LPC32XX_CONSOLE=y
# CONFIG_HW_RANDOM is not set
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_PNX=y
CONFIG_GPIO_LPC32XX=y
CONFIG_SPI=y
CONFIG_SPI_PL022=y
CONFIG_GPIO_SYSFS=y
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7 changes: 7 additions & 0 deletions drivers/gpio/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -311,6 +311,13 @@ config GPIO_LPC18XX
Select this option to enable GPIO driver for
NXP LPC18XX/43XX devices.

config GPIO_LPC32XX
tristate "NXP LPC32XX GPIO support"
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
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2 changes: 1 addition & 1 deletion drivers/gpio/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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118 changes: 68 additions & 50 deletions drivers/gpio/gpio-lpc32xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,36 +16,33 @@
#include <linux/platform_device.h>
#include <linux/module.h>

#include <mach/hardware.h>
#include <mach/platform.h>

#define LPC32XX_GPIO_P3_INP_STATE _GPREG(0x000)
#define LPC32XX_GPIO_P3_OUTP_SET _GPREG(0x004)
#define LPC32XX_GPIO_P3_OUTP_CLR _GPREG(0x008)
#define LPC32XX_GPIO_P3_OUTP_STATE _GPREG(0x00C)
#define LPC32XX_GPIO_P2_DIR_SET _GPREG(0x010)
#define LPC32XX_GPIO_P2_DIR_CLR _GPREG(0x014)
#define LPC32XX_GPIO_P2_DIR_STATE _GPREG(0x018)
#define LPC32XX_GPIO_P2_INP_STATE _GPREG(0x01C)
#define LPC32XX_GPIO_P2_OUTP_SET _GPREG(0x020)
#define LPC32XX_GPIO_P2_OUTP_CLR _GPREG(0x024)
#define LPC32XX_GPIO_P2_MUX_SET _GPREG(0x028)
#define LPC32XX_GPIO_P2_MUX_CLR _GPREG(0x02C)
#define LPC32XX_GPIO_P2_MUX_STATE _GPREG(0x030)
#define LPC32XX_GPIO_P0_INP_STATE _GPREG(0x040)
#define LPC32XX_GPIO_P0_OUTP_SET _GPREG(0x044)
#define LPC32XX_GPIO_P0_OUTP_CLR _GPREG(0x048)
#define LPC32XX_GPIO_P0_OUTP_STATE _GPREG(0x04C)
#define LPC32XX_GPIO_P0_DIR_SET _GPREG(0x050)
#define LPC32XX_GPIO_P0_DIR_CLR _GPREG(0x054)
#define LPC32XX_GPIO_P0_DIR_STATE _GPREG(0x058)
#define LPC32XX_GPIO_P1_INP_STATE _GPREG(0x060)
#define LPC32XX_GPIO_P1_OUTP_SET _GPREG(0x064)
#define LPC32XX_GPIO_P1_OUTP_CLR _GPREG(0x068)
#define LPC32XX_GPIO_P1_OUTP_STATE _GPREG(0x06C)
#define LPC32XX_GPIO_P1_DIR_SET _GPREG(0x070)
#define LPC32XX_GPIO_P1_DIR_CLR _GPREG(0x074)
#define LPC32XX_GPIO_P1_DIR_STATE _GPREG(0x078)
#define LPC32XX_GPIO_P3_INP_STATE (0x000)
#define LPC32XX_GPIO_P3_OUTP_SET (0x004)
#define LPC32XX_GPIO_P3_OUTP_CLR (0x008)
#define LPC32XX_GPIO_P3_OUTP_STATE (0x00C)
#define LPC32XX_GPIO_P2_DIR_SET (0x010)
#define LPC32XX_GPIO_P2_DIR_CLR (0x014)
#define LPC32XX_GPIO_P2_DIR_STATE (0x018)
#define LPC32XX_GPIO_P2_INP_STATE (0x01C)
#define LPC32XX_GPIO_P2_OUTP_SET (0x020)
#define LPC32XX_GPIO_P2_OUTP_CLR (0x024)
#define LPC32XX_GPIO_P2_MUX_SET (0x028)
#define LPC32XX_GPIO_P2_MUX_CLR (0x02C)
#define LPC32XX_GPIO_P2_MUX_STATE (0x030)
#define LPC32XX_GPIO_P0_INP_STATE (0x040)
#define LPC32XX_GPIO_P0_OUTP_SET (0x044)
#define LPC32XX_GPIO_P0_OUTP_CLR (0x048)
#define LPC32XX_GPIO_P0_OUTP_STATE (0x04C)
#define LPC32XX_GPIO_P0_DIR_SET (0x050)
#define LPC32XX_GPIO_P0_DIR_CLR (0x054)
#define LPC32XX_GPIO_P0_DIR_STATE (0x058)
#define LPC32XX_GPIO_P1_INP_STATE (0x060)
#define LPC32XX_GPIO_P1_OUTP_SET (0x064)
#define LPC32XX_GPIO_P1_OUTP_CLR (0x068)
#define LPC32XX_GPIO_P1_OUTP_STATE (0x06C)
#define LPC32XX_GPIO_P1_DIR_SET (0x070)
#define LPC32XX_GPIO_P1_DIR_CLR (0x074)
#define LPC32XX_GPIO_P1_DIR_STATE (0x078)

#define GPIO012_PIN_TO_BIT(x) (1 << (x))
#define GPIO3_PIN_TO_BIT(x) (1 << ((x) + 25))
Expand All @@ -72,12 +69,12 @@
#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;
};

/*
Expand Down Expand Up @@ -165,16 +162,27 @@ static struct gpio_regs gpio_grp_regs_p3 = {
struct lpc32xx_gpio_chip {
struct gpio_chip chip;
struct gpio_regs *gpio_grp;
void __iomem *reg_base;
};

static inline u32 gpreg_read(struct lpc32xx_gpio_chip *group, unsigned long offset)
{
return __raw_readl(group->reg_base + offset);
}

static inline void gpreg_write(struct lpc32xx_gpio_chip *group, u32 val, unsigned long offset)
{
__raw_writel(val, group->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(group, GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->dir_clr);
else
__raw_writel(GPIO012_PIN_TO_BIT(pin),
gpreg_write(group, GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->dir_set);
}

Expand All @@ -184,19 +192,19 @@ 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(group, u, group->gpio_grp->dir_clr);
else
__raw_writel(u, group->gpio_grp->dir_set);
gpreg_write(group, 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(group, GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->outp_set);
else
__raw_writel(GPIO012_PIN_TO_BIT(pin),
gpreg_write(group, GPIO012_PIN_TO_BIT(pin),
group->gpio_grp->outp_clr);
}

Expand All @@ -206,31 +214,31 @@ 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(group, u, group->gpio_grp->outp_set);
else
__raw_writel(u, group->gpio_grp->outp_clr);
gpreg_write(group, 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(group, 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(group, 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, 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, group->gpio_grp->inp_state);

/*
* P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
Expand All @@ -242,13 +250,13 @@ 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, 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, group->gpio_grp->outp_state), pin);
}

/*
Expand Down Expand Up @@ -497,12 +505,18 @@ static int lpc32xx_of_xlate(struct gpio_chip *gc,
static int lpc32xx_gpio_probe(struct platform_device *pdev)
{
int i;
void __iomem *reg_base;

reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(reg_base))
return PTR_ERR(reg_base);

for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
if (pdev->dev.of_node) {
lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3;
lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node;
lpc32xx_gpiochip[i].reg_base = reg_base;
}
devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip,
&lpc32xx_gpiochip[i]);
Expand All @@ -527,3 +541,7 @@ static struct platform_driver lpc32xx_gpio_driver = {
};

module_platform_driver(lpc32xx_gpio_driver);

MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("GPIO driver for LPC32xx SoC");

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