[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: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -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

@@ -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

@@ -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);
+}