Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit cf0936b0 authored by Hauke Mehrtens's avatar Hauke Mehrtens Committed by John Crispin
Browse files

bcma: 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: default avatarHauke Mehrtens <hauke@hauke-m.de>
Patchwork: http://patchwork.linux-mips.org/patch/4587


Acked-by: default avatarFlorian Fainelli <florian@openwrt.org>
parent 3e8bb507

drivers/bcma/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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

drivers/bcma/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/bcma/bcma_private.h

+10 −0
Original line number Diff line number Diff line
@@ -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

drivers/bcma/driver_gpio.c

0 → 100644
+98 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

drivers/bcma/main.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}