Commit 3896b054 authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Ralf Baechle
Browse files

[MIPS] rbtx4938: Add generic GPIO support 



GPIO 0..15 are for TX4938 PIO pins, GPIO 16..18 are for FPGA-driven
chipselect signals for SPI devices.

Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 06cf5583

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -660,6 +660,7 @@ config TOSHIBA_RBTX4938 
	select SYS_SUPPORTS_BIG_ENDIAN

	select SYS_SUPPORTS_KGDB

	select GENERIC_HARDIRQS_NO__DO_IRQ

	select GENERIC_GPIO

	help

	  This Toshiba board is based on the TX4938 processor. Say Y here to

	  support this machine type

arch/mips/configs/rbhma4500_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ CONFIG_DMA_NONCOHERENT=y 
CONFIG_DMA_NEED_PCI_MAP_STATE=y

CONFIG_GENERIC_ISA_DMA=y

CONFIG_I8259=y

CONFIG_GENERIC_GPIO=y

# CONFIG_CPU_BIG_ENDIAN is not set

CONFIG_CPU_LITTLE_ENDIAN=y

CONFIG_SYS_SUPPORTS_BIG_ENDIAN=y

arch/mips/tx4938/toshiba_rbtx4938/setup.c

+104 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <asm/uaccess.h>

#include <asm/io.h>

#include <asm/bootinfo.h>

#include <asm/gpio.h>

#include <asm/tx4938/rbtx4938.h>

#ifdef CONFIG_SERIAL_TXX9

#include <linux/tty.h>
@@ -1057,3 +1058,106 @@ static int __init rbtx4938_ne_init(void) 
	return IS_ERR(dev) ? PTR_ERR(dev) : 0;

}

device_initcall(rbtx4938_ne_init);



/* GPIO support */



static DEFINE_SPINLOCK(rbtx4938_spi_gpio_lock);



static void rbtx4938_spi_gpio_set(unsigned gpio, int value)

{

	u8 val;

	unsigned long flags;

	gpio -= 16;

	spin_lock_irqsave(&rbtx4938_spi_gpio_lock, flags);

	val = *rbtx4938_spics_ptr;

	if (value)

		val |= 1 << gpio;

	else

		val &= ~(1 << gpio);

	*rbtx4938_spics_ptr = val;

	mmiowb();

	spin_unlock_irqrestore(&rbtx4938_spi_gpio_lock, flags);

}



static int rbtx4938_spi_gpio_dir_out(unsigned gpio, int value)

{

	rbtx4938_spi_gpio_set(gpio, value);

	return 0;

}



static DEFINE_SPINLOCK(tx4938_gpio_lock);



static int tx4938_gpio_get(unsigned gpio)

{

	return tx4938_pioptr->din & (1 << gpio);

}



static void tx4938_gpio_set_raw(unsigned gpio, int value)

{

	u32 val;

	val = tx4938_pioptr->dout;

	if (value)

		val |= 1 << gpio;

	else

		val &= ~(1 << gpio);

	tx4938_pioptr->dout = val;

}



static void tx4938_gpio_set(unsigned gpio, int value)

{

	unsigned long flags;

	spin_lock_irqsave(&tx4938_gpio_lock, flags);

	tx4938_gpio_set_raw(gpio, value);

	mmiowb();

	spin_unlock_irqrestore(&tx4938_gpio_lock, flags);

}



static int tx4938_gpio_dir_in(unsigned gpio)

{

	spin_lock_irq(&tx4938_gpio_lock);

	tx4938_pioptr->dir &= ~(1 << gpio);

	mmiowb();

	spin_unlock_irq(&tx4938_gpio_lock);

	return 0;

}



static int tx4938_gpio_dir_out(unsigned int gpio, int value)

{

	spin_lock_irq(&tx4938_gpio_lock);

	tx4938_gpio_set_raw(gpio, value);

	tx4938_pioptr->dir |= 1 << gpio;

	mmiowb();

	spin_unlock_irq(&tx4938_gpio_lock);

	return 0;

}



int gpio_direction_input(unsigned gpio)

{

	if (gpio < 16)

		return tx4938_gpio_dir_in(gpio);

	return -EINVAL;

}



int gpio_direction_output(unsigned gpio, int value)

{

	if (gpio < 16)

		return tx4938_gpio_dir_out(gpio, value);

	if (gpio < 16 + 3)

		return rbtx4938_spi_gpio_dir_out(gpio, value);

	return -EINVAL;

}



int gpio_get_value(unsigned gpio)

{

	if (gpio < 16)

		return tx4938_gpio_get(gpio);

	return 0;

}



void gpio_set_value(unsigned gpio, int value)

{

	if (gpio < 16)

		tx4938_gpio_set(gpio, value);

	else

		rbtx4938_spi_gpio_set(gpio, value);

}