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 <hauke@xxxxxxxxxx> --- drivers/bcma/Kconfig | 9 +++ drivers/bcma/Makefile | 1 + drivers/bcma/bcma_private.h | 10 +++ drivers/bcma/driver_gpio.c | 95 +++++++++++++++++++++++++++ drivers/bcma/main.c | 3 + include/linux/bcma/bcma_driver_chipcommon.h | 5 ++ 6 files changed, 123 insertions(+) create mode 100644 drivers/bcma/driver_gpio.c diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig index a533af2..871400c 100644 --- a/drivers/bcma/Kconfig +++ b/drivers/bcma/Kconfig @@ -65,6 +65,15 @@ config BCMA_DRIVER_GMAC_CMN If unsure, say N +config BCMA_DRIVER_GPIO + bool + depends on BCMA + select GPIOLIB + help + Driver to provide access to the GPIO pins. + + If unsure, say N + config BCMA_DEBUG bool "BCMA debugging" depends on BCMA diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile index 8ad42d4..734b32f 100644 --- a/drivers/bcma/Makefile +++ b/drivers/bcma/Makefile @@ -6,6 +6,7 @@ bcma-y += driver_pci.o bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE) += driver_pci_host.o bcma-$(CONFIG_BCMA_DRIVER_MIPS) += driver_mips.o bcma-$(CONFIG_BCMA_DRIVER_GMAC_CMN) += driver_gmac_cmn.o +bcma-$(CONFIG_BCMA_DRIVER_GPIO) += driver_gpio.o bcma-$(CONFIG_BCMA_HOST_PCI) += host_pci.o bcma-$(CONFIG_BCMA_HOST_SOC) += host_soc.o obj-$(CONFIG_BCMA) += bcma.o diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h index 169fc58..522d949 100644 --- a/drivers/bcma/bcma_private.h +++ b/drivers/bcma/bcma_private.h @@ -89,4 +89,14 @@ bool __devinit bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc); void __devinit bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc); #endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */ +#ifdef CONFIG_BCMA_DRIVER_GPIO +/* driver_gpio.c */ +int bcma_gpio_init(struct bcma_drv_cc *cc); +#else +static inline int bcma_gpio_init(struct bcma_drv_cc *cc) +{ + return 0; +} +#endif /* CONFIG_BCMA_DRIVER_GPIO */ + #endif diff --git a/drivers/bcma/driver_gpio.c b/drivers/bcma/driver_gpio.c new file mode 100644 index 0000000..2b9e404 --- /dev/null +++ b/drivers/bcma/driver_gpio.c @@ -0,0 +1,95 @@ +/* + * Broadcom specific AMBA + * GPIO driver + * + * Copyright 2011, Broadcom Corporation + * Copyright 2012, Hauke Mehrtens <hauke@xxxxxxxxxx> + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include <linux/gpio.h> +#include <linux/export.h> +#include <linux/bcma/bcma.h> + +#include "bcma_private.h" + +static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip) +{ + return container_of(chip, struct bcma_drv_cc, gpio); +} + +static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + return !!bcma_chipco_gpio_in(cc, 1 << gpio); +} + +static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); +} + +static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + bcma_chipco_gpio_outen(cc, 1 << gpio, 0); + return 0; +} + +static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, + int value) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio); + bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); + return 0; +} + +static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + bcma_chipco_gpio_control(cc, 1 << gpio, 0); + /* clear pulldown */ + bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0); + /* Set pullup */ + bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio); + + return 0; +} + +static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio) +{ + struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); + + /* clear pullup */ + bcma_chipco_gpio_pullup(cc, 1 << gpio, 0); +} + +int bcma_gpio_init(struct bcma_drv_cc *cc) +{ + struct gpio_chip *chip = &cc->gpio; + + chip->label = "bcma_gpio"; + chip->owner = THIS_MODULE; + chip->request = bcma_gpio_request; + chip->free = bcma_gpio_free; + chip->get = bcma_gpio_get_value; + chip->set = bcma_gpio_set_value; + chip->direction_input = bcma_gpio_direction_input; + chip->direction_output = bcma_gpio_direction_output; + chip->ngpio = 16; + if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC) + chip->base = 0; + else + chip->base = -1; + + return gpiochip_add(chip); +} diff --git a/drivers/bcma/main.c b/drivers/bcma/main.c index d865470..0c2e5ea 100644 --- a/drivers/bcma/main.c +++ b/drivers/bcma/main.c @@ -152,6 +152,9 @@ static int bcma_register_cores(struct bcma_bus *bus) bcma_err(bus, "Error registering NAND flash\n"); } #endif + err = bcma_gpio_init(&bus->drv_cc); + if (err) + bcma_err(bus, "Error registering GPIO driver\n"); return 0; } diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h index 2567026..7d662a9 100644 --- a/include/linux/bcma/bcma_driver_chipcommon.h +++ b/include/linux/bcma/bcma_driver_chipcommon.h @@ -1,6 +1,8 @@ #ifndef LINUX_BCMA_DRIVER_CC_H_ #define LINUX_BCMA_DRIVER_CC_H_ +#include <linux/gpio.h> + /** ChipCommon core registers. **/ #define BCMA_CC_ID 0x0000 #define BCMA_CC_ID_ID 0x0000FFFF @@ -570,6 +572,9 @@ struct bcma_drv_cc { /* Lock for GPIO register access. */ spinlock_t gpio_lock; +#ifdef CONFIG_BCMA_DRIVER_GPIO + struct gpio_chip gpio; +#endif }; /* Register access */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html