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Commit ec43b08b authored by Hauke Mehrtens's avatar Hauke Mehrtens Committed by John Crispin
Browse files

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: default avatarHauke Mehrtens <hauke@hauke-m.de>
Patchwork: http://patchwork.linux-mips.org/patch/4591


Acked-by: default avatarFlorian Fainelli <florian@openwrt.org>
parent 394bc7e3

drivers/ssb/Kconfig

+9 −0
Original line number Original line Diff line number Diff line
@@ -160,4 +160,13 @@ config SSB_DRIVER_GIGE 




	  If unsure, say N

	  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
 
endmenu

drivers/ssb/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -15,6 +15,7 @@ ssb-$(CONFIG_SSB_DRIVER_MIPS) += driver_mipscore.o 
ssb-$(CONFIG_SSB_DRIVER_EXTIF)		+= driver_extif.o

ssb-$(CONFIG_SSB_DRIVER_EXTIF)		+= driver_extif.o

ssb-$(CONFIG_SSB_DRIVER_PCICORE)	+= driver_pcicore.o

ssb-$(CONFIG_SSB_DRIVER_PCICORE)	+= driver_pcicore.o

ssb-$(CONFIG_SSB_DRIVER_GIGE)		+= driver_gige.o

ssb-$(CONFIG_SSB_DRIVER_GIGE)		+= driver_gige.o

ssb-$(CONFIG_SSB_DRIVER_GPIO)		+= driver_gpio.o





# b43 pci-ssb-bridge driver

# b43 pci-ssb-bridge driver

# Not strictly a part of SSB, but kept here for convenience

# Not strictly a part of SSB, but kept here for convenience

drivers/ssb/driver_gpio.c

0 → 100644
+176 −0
Original line number Original line Diff line number Diff line 
/*

 * Sonics Silicon Backplane

 * 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/ssb/ssb.h>



#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;

}

drivers/ssb/main.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -798,6 +798,12 @@ static int __devinit ssb_bus_register(struct ssb_bus *bus, 
	ssb_chipcommon_init(&bus->chipco);

	ssb_chipcommon_init(&bus->chipco);

	ssb_extif_init(&bus->extif);

	ssb_extif_init(&bus->extif);

	ssb_mipscore_init(&bus->mipscore);

	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);

	err = ssb_fetch_invariants(bus, get_invariants);

	if (err) {

	if (err) {

		ssb_bus_may_powerdown(bus);

		ssb_bus_may_powerdown(bus);

drivers/ssb/ssb_private.h

+9 −0
Original line number Original line Diff line number Diff line
@@ -219,4 +219,13 @@ static inline void ssb_extif_init(struct ssb_extif *extif) 
}

}

#endif

#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_ */
 
#endif /* LINUX_SSB_PRIVATE_H_ */