diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 26 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/mpc85xx_gpio.c | 187 |
3 files changed, 214 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 93a7e8c6c23..b674a478248 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -173,4 +173,30 @@ config DM_PCA953X Now, max 24 bits chips and PCA953X compatible chips are supported + +config MPC85XX_GPIO + bool "Freescale MPC85XX GPIO driver" + depends on DM_GPIO + help + This driver supports the built-in GPIO controller of MPC85XX CPUs. + Each GPIO bank is identified by its own entry in the device tree, + i.e. + + gpio-controller@fc00 { + #gpio-cells = <2>; + compatible = "fsl,pq3-gpio"; + reg = <0xfc00 0x100> + } + + By default, each bank is assumed to have 32 GPIOs, but the ngpios + setting is honored, so the number of GPIOs for each bank is + configurable to match the actual GPIO count of the SoC (e.g. the + 32/32/23 banks of the P1022 SoC). + + The standard functions of input/output mode, and output value setting + are supported; the open-drain capability of the controller is not + supported yet. + + The driver has been tested on MPC85XX, but it is likely that other + PowerQUICC III devices will work as well. endmenu diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index ddec1ef8dee..21b2cc26776 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o obj-$(CONFIG_DM644X_GPIO) += da8xx_gpio.o obj-$(CONFIG_ALTERA_PIO) += altera_pio.o obj-$(CONFIG_MPC83XX_GPIO) += mpc83xx_gpio.o +obj-$(CONFIG_MPC85XX_GPIO) += mpc85xx_gpio.o obj-$(CONFIG_SH_GPIO_PFC) += sh_pfc.o obj-$(CONFIG_OMAP_GPIO) += omap_gpio.o obj-$(CONFIG_DB8500_GPIO) += db8500_gpio.o diff --git a/drivers/gpio/mpc85xx_gpio.c b/drivers/gpio/mpc85xx_gpio.c new file mode 100644 index 00000000000..17755dfb924 --- /dev/null +++ b/drivers/gpio/mpc85xx_gpio.c @@ -0,0 +1,187 @@ +/* + * (C) Copyright 2016 + * Mario Six, Guntermann & Drunck GmbH, six@gdsys.de + * + * based on arch/powerpc/include/asm/mpc85xx_gpio.h, which is + * + * Copyright 2010 eXMeritus, A Boeing Company + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <asm/gpio.h> +#include <mapmem.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct ccsr_gpio { + u32 gpdir; + u32 gpodr; + u32 gpdat; + u32 gpier; + u32 gpimr; + u32 gpicr; +}; + +struct mpc85xx_gpio_data { + /* The bank's register base in memory */ + struct ccsr_gpio __iomem *base; + /* The address of the registers; used to identify the bank */ + ulong addr; + /* The GPIO count of the bank */ + uint gpio_count; + /* The GPDAT register cannot be used to determine the value of output + * pins on MPC8572/MPC8536, so we shadow it and use the shadowed value + * for output pins */ + u32 dat_shadow; +}; + +inline u32 gpio_mask(unsigned gpio) { + return (1U << (31 - (gpio))); +} + +static inline u32 mpc85xx_gpio_get_val(struct ccsr_gpio *base, u32 mask) +{ + return in_be32(&base->gpdat) & mask; +} + +static inline u32 mpc85xx_gpio_get_dir(struct ccsr_gpio *base, u32 mask) +{ + return in_be32(&base->gpdir) & mask; +} + +static inline void mpc85xx_gpio_set_in(struct ccsr_gpio *base, u32 gpios) +{ + clrbits_be32(&base->gpdat, gpios); + /* GPDIR register 0 -> input */ + clrbits_be32(&base->gpdir, gpios); +} + +static inline void mpc85xx_gpio_set_low(struct ccsr_gpio *base, u32 gpios) +{ + clrbits_be32(&base->gpdat, gpios); + /* GPDIR register 1 -> output */ + setbits_be32(&base->gpdir, gpios); +} + +static inline void mpc85xx_gpio_set_high(struct ccsr_gpio *base, u32 gpios) +{ + setbits_be32(&base->gpdat, gpios); + /* GPDIR register 1 -> output */ + setbits_be32(&base->gpdir, gpios); +} + +static int mpc85xx_gpio_direction_input(struct udevice *dev, unsigned gpio) +{ + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + + mpc85xx_gpio_set_in(data->base, gpio_mask(gpio)); + return 0; +} + +static int mpc85xx_gpio_set_value(struct udevice *dev, unsigned gpio, + int value) +{ + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + + if (value) { + data->dat_shadow |= gpio_mask(gpio); + mpc85xx_gpio_set_high(data->base, gpio_mask(gpio)); + } else { + data->dat_shadow &= ~gpio_mask(gpio); + mpc85xx_gpio_set_low(data->base, gpio_mask(gpio)); + } + return 0; +} + +static int mpc85xx_gpio_direction_output(struct udevice *dev, unsigned gpio, + int value) +{ + return mpc85xx_gpio_set_value(dev, gpio, value); +} + +static int mpc85xx_gpio_get_value(struct udevice *dev, unsigned gpio) +{ + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + + if (!!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio))) { + /* Output -> use shadowed value */ + return !!(data->dat_shadow & gpio_mask(gpio)); + } else { + /* Input -> read value from GPDAT register */ + return !!mpc85xx_gpio_get_val(data->base, gpio_mask(gpio)); + } +} + +static int mpc85xx_gpio_get_function(struct udevice *dev, unsigned gpio) +{ + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + int dir; + + dir = !!mpc85xx_gpio_get_dir(data->base, gpio_mask(gpio)); + return dir ? GPIOF_OUTPUT : GPIOF_INPUT; +} + +static int mpc85xx_gpio_ofdata_to_platdata(struct udevice *dev) { + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + + addr = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset, + "reg", 0, &size); + + data->addr = addr; + data->base = map_sysmem(CONFIG_SYS_IMMR + addr, size); + + if (!data->base) + return -ENOMEM; + + data->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "ngpios", 32); + data->dat_shadow = 0; + + return 0; +} + +static int mpc85xx_gpio_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct mpc85xx_gpio_data *data = dev_get_priv(dev); + char name[32], *str; + + snprintf(name, sizeof(name), "MPC@%lx_", data->addr); + str = strdup(name); + + if (!str) + return -ENOMEM; + + uc_priv->bank_name = str; + uc_priv->gpio_count = data->gpio_count; + + return 0; +} + +static const struct dm_gpio_ops gpio_mpc85xx_ops = { + .direction_input = mpc85xx_gpio_direction_input, + .direction_output = mpc85xx_gpio_direction_output, + .get_value = mpc85xx_gpio_get_value, + .set_value = mpc85xx_gpio_set_value, + .get_function = mpc85xx_gpio_get_function, +}; + +static const struct udevice_id mpc85xx_gpio_ids[] = { + { .compatible = "fsl,pq3-gpio" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(gpio_mpc85xx) = { + .name = "gpio_mpc85xx", + .id = UCLASS_GPIO, + .ops = &gpio_mpc85xx_ops, + .ofdata_to_platdata = mpc85xx_gpio_ofdata_to_platdata, + .of_match = mpc85xx_gpio_ids, + .probe = mpc85xx_gpio_probe, + .priv_auto_alloc_size = sizeof(struct mpc85xx_gpio_data), +}; |