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[PATCH 1/4] rbtx4938: Add generic GPIO support

To: linux-mips@linux-mips.org
Subject: [PATCH 1/4] rbtx4938: Add generic GPIO support
From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Fri, 22 Jun 2007 23:21:55 +0900 (JST)
Cc: ralf@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
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>
---
This patch depends on:
[PATCH] Add MIPS generic GPIO support (by Yoichi Yuasa, already queued)
[PATCH] Create fallback gpio.h

 arch/mips/Kconfig                         |    1 +
 arch/mips/configs/rbhma4500_defconfig     |    1 +
 arch/mips/tx4938/toshiba_rbtx4938/setup.c |  100 +++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+), 0 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 24661d6..823a628 100644
--- a/arch/mips/Kconfig
+++ b/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
diff --git a/arch/mips/configs/rbhma4500_defconfig 
b/arch/mips/configs/rbhma4500_defconfig
index b0abd16..6e10c15 100644
--- a/arch/mips/configs/rbhma4500_defconfig
+++ b/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
diff --git a/arch/mips/tx4938/toshiba_rbtx4938/setup.c 
b/arch/mips/tx4938/toshiba_rbtx4938/setup.c
index f5d1ce7..9f83844 100644
--- a/arch/mips/tx4938/toshiba_rbtx4938/setup.c
+++ b/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 +1058,102 @@ 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;
+       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);
+       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);
+       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;
+       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);
+}

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