From ec43b08b5733494ad88aa618ecdf534320dd8207 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Tue, 20 Nov 2012 22:24:33 +0000 Subject: [PATCH] ssb: add GPIO driver Register a GPIO driver to access the GPIOs provided by the chip. The GPIOs of the SoC should always start at 0 and the other GPIOs could start at a random position. There is just one SoC in a system and when they start at 0 the number is predictable. Signed-off-by: Hauke Mehrtens Patchwork: http://patchwork.linux-mips.org/patch/4591 Acked-by: Florian Fainelli --- drivers/ssb/Kconfig | 9 ++ drivers/ssb/Makefile | 1 + drivers/ssb/driver_gpio.c | 176 ++++++++++++++++++++++++++++++++++++++ drivers/ssb/main.c | 6 ++ drivers/ssb/ssb_private.h | 9 ++ include/linux/ssb/ssb.h | 4 + 6 files changed, 205 insertions(+) create mode 100644 drivers/ssb/driver_gpio.c diff --git a/drivers/ssb/Kconfig b/drivers/ssb/Kconfig index 42cdaa9a4d8a..ff3c8a21f10d 100644 --- a/drivers/ssb/Kconfig +++ b/drivers/ssb/Kconfig @@ -160,4 +160,13 @@ config SSB_DRIVER_GIGE If unsure, say N +config SSB_DRIVER_GPIO + bool "SSB GPIO driver" + depends on SSB + select GPIOLIB + help + Driver to provide access to the GPIO pins on the bus. + + If unsure, say N + endmenu diff --git a/drivers/ssb/Makefile b/drivers/ssb/Makefile index 656e58b92618..9159ba77c388 100644 --- a/drivers/ssb/Makefile +++ b/drivers/ssb/Makefile @@ -15,6 +15,7 @@ ssb-$(CONFIG_SSB_DRIVER_MIPS) += driver_mipscore.o ssb-$(CONFIG_SSB_DRIVER_EXTIF) += driver_extif.o ssb-$(CONFIG_SSB_DRIVER_PCICORE) += driver_pcicore.o ssb-$(CONFIG_SSB_DRIVER_GIGE) += driver_gige.o +ssb-$(CONFIG_SSB_DRIVER_GPIO) += driver_gpio.o # b43 pci-ssb-bridge driver # Not strictly a part of SSB, but kept here for convenience diff --git a/drivers/ssb/driver_gpio.c b/drivers/ssb/driver_gpio.c new file mode 100644 index 000000000000..97ac0a38e3d0 --- /dev/null +++ b/drivers/ssb/driver_gpio.c @@ -0,0 +1,176 @@ +/* + * Sonics Silicon Backplane + * GPIO driver + * + * Copyright 2011, Broadcom Corporation + * Copyright 2012, Hauke Mehrtens + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include +#include +#include + +#include "ssb_private.h" + +static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip) +{ + return container_of(chip, struct ssb_bus, gpio); +} + +static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio); +} + +static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); +} + +static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip, + unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0); + return 0; +} + +static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip, + unsigned gpio, int value) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio); + ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); + return 0; +} + +static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0); + /* clear pulldown */ + ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0); + /* Set pullup */ + ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio); + + return 0; +} + +static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + /* clear pullup */ + ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0); +} + +static int ssb_gpio_chipco_init(struct ssb_bus *bus) +{ + struct gpio_chip *chip = &bus->gpio; + + chip->label = "ssb_chipco_gpio"; + chip->owner = THIS_MODULE; + chip->request = ssb_gpio_chipco_request; + chip->free = ssb_gpio_chipco_free; + chip->get = ssb_gpio_chipco_get_value; + chip->set = ssb_gpio_chipco_set_value; + chip->direction_input = ssb_gpio_chipco_direction_input; + chip->direction_output = ssb_gpio_chipco_direction_output; + chip->ngpio = 16; + /* There is just one SoC in one device and its GPIO addresses should be + * deterministic to address them more easily. The other buses could get + * a random base number. */ + if (bus->bustype == SSB_BUSTYPE_SSB) + chip->base = 0; + else + chip->base = -1; + + return gpiochip_add(chip); +} + +#ifdef CONFIG_SSB_DRIVER_EXTIF + +static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio); +} + +static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); +} + +static int ssb_gpio_extif_direction_input(struct gpio_chip *chip, + unsigned gpio) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0); + return 0; +} + +static int ssb_gpio_extif_direction_output(struct gpio_chip *chip, + unsigned gpio, int value) +{ + struct ssb_bus *bus = ssb_gpio_get_bus(chip); + + ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio); + ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); + return 0; +} + +static int ssb_gpio_extif_init(struct ssb_bus *bus) +{ + struct gpio_chip *chip = &bus->gpio; + + chip->label = "ssb_extif_gpio"; + chip->owner = THIS_MODULE; + chip->get = ssb_gpio_extif_get_value; + chip->set = ssb_gpio_extif_set_value; + chip->direction_input = ssb_gpio_extif_direction_input; + chip->direction_output = ssb_gpio_extif_direction_output; + chip->ngpio = 5; + /* There is just one SoC in one device and its GPIO addresses should be + * deterministic to address them more easily. The other buses could get + * a random base number. */ + if (bus->bustype == SSB_BUSTYPE_SSB) + chip->base = 0; + else + chip->base = -1; + + return gpiochip_add(chip); +} + +#else +static int ssb_gpio_extif_init(struct ssb_bus *bus) +{ + return -ENOTSUPP; +} +#endif + +int ssb_gpio_init(struct ssb_bus *bus) +{ + if (ssb_chipco_available(&bus->chipco)) + return ssb_gpio_chipco_init(bus); + else if (ssb_extif_available(&bus->extif)) + return ssb_gpio_extif_init(bus); + else + SSB_WARN_ON(1); + + return -1; +} diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c index 6fe2d102734a..87f0ddf4f3f3 100644 --- a/drivers/ssb/main.c +++ b/drivers/ssb/main.c @@ -798,6 +798,12 @@ static int __devinit ssb_bus_register(struct ssb_bus *bus, ssb_chipcommon_init(&bus->chipco); ssb_extif_init(&bus->extif); ssb_mipscore_init(&bus->mipscore); + err = ssb_gpio_init(bus); + if (err == -ENOTSUPP) + ssb_dprintk(KERN_DEBUG PFX "GPIO driver not activated\n"); + else if (err) + ssb_dprintk(KERN_ERR PFX + "Error registering GPIO driver: %i\n", err); err = ssb_fetch_invariants(bus, get_invariants); if (err) { ssb_bus_may_powerdown(bus); diff --git a/drivers/ssb/ssb_private.h b/drivers/ssb/ssb_private.h index d6a1ba9394d9..463b76a2140b 100644 --- a/drivers/ssb/ssb_private.h +++ b/drivers/ssb/ssb_private.h @@ -219,4 +219,13 @@ static inline void ssb_extif_init(struct ssb_extif *extif) } #endif +#ifdef CONFIG_SSB_DRIVER_GPIO +extern int ssb_gpio_init(struct ssb_bus *bus); +#else /* CONFIG_SSB_DRIVER_GPIO */ +static inline int ssb_gpio_init(struct ssb_bus *bus) +{ + return -ENOTSUPP; +} +#endif /* CONFIG_SSB_DRIVER_GPIO */ + #endif /* LINUX_SSB_PRIVATE_H_ */ diff --git a/include/linux/ssb/ssb.h b/include/linux/ssb/ssb.h index bb674c02f306..3862a5bbd73b 100644 --- a/include/linux/ssb/ssb.h +++ b/include/linux/ssb/ssb.h @@ -6,6 +6,7 @@ #include #include #include +#include #include #include @@ -433,6 +434,9 @@ struct ssb_bus { /* Lock for GPIO register access. */ spinlock_t gpio_lock; #endif /* EMBEDDED */ +#ifdef CONFIG_SSB_DRIVER_GPIO + struct gpio_chip gpio; +#endif /* DRIVER_GPIO */ /* Internal-only stuff follows. Do not touch. */ struct list_head list; -- GitLab