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bcma: add GPIO driver

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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@hauke-m.de>
Patchwork: http://patchwork.linux-mips.org/patch/4587
Acked-by: Florian Fainelli <florian@openwrt.org>
This commit is contained in:
Hauke Mehrtens 2012-11-20 22:24:30 +00:00 committed by John Crispin
parent 3e8bb507ed
commit cf0936b06d
6 changed files with 128 additions and 0 deletions
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9
drivers/bcma/Kconfig
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@ -65,6 +65,15 @@ config BCMA_DRIVER_GMAC_CMN
If unsure, say N
config BCMA_DRIVER_GPIO
bool "BCMA GPIO driver"
depends on BCMA
select GPIOLIB
help
Driver to provide access to the GPIO pins of the bcma bus.
If unsure, say N
config BCMA_DEBUG
bool "BCMA debugging"
depends on BCMA

1
drivers/bcma/Makefile
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@ -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

10
drivers/bcma/bcma_private.h
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@ -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 -ENOTSUPP;
}
#endif /* CONFIG_BCMA_DRIVER_GPIO */
#endif

98
drivers/bcma/driver_gpio.c Normal file
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@ -0,0 +1,98 @@
/*
* Broadcom specific AMBA
* GPIO driver
*
* Copyright 2011, Broadcom Corporation
* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
*
* 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;
/* 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 (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
chip->base = 0;
else
chip->base = -1;
return gpiochip_add(chip);
}

5
drivers/bcma/main.c
View File

@ -152,6 +152,11 @@ 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 == -ENOTSUPP)
bcma_debug(bus, "GPIO driver not activated\n");
else if (err)
bcma_err(bus, "Error registering GPIO driver: %i\n", err);
return 0;
}

5
include/linux/bcma/bcma_driver_chipcommon.h
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@ -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 */