From a9aec7fe74cd912cad74ca621ed91cb1c37566ae Mon Sep 17 00:00:00 2001
From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Sat, 5 Apr 2008 00:55:41 +0900
Subject: [PATCH] [MIPS] generic txx9 gpio support
This is a board-independent TXx9 gpio API implementation using gpiolib.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/Kconfig | 5 +++
arch/mips/kernel/Makefile | 2 +
arch/mips/kernel/gpio_txx9.c | 87 ++++++++++++++++++++++++++++++++++++
include/asm-mips/txx9pio.h | 29 ++++++++++++
4 files changed, 123 insertions(+)
create mode 100644 arch/mips/kernel/gpio_txx9.c
create mode 100644 include/asm-mips/txx9pio.h
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9e1fc966895ce..f4c313f9036b4 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -789,6 +789,11 @@ config CSRC_R4K
config CSRC_SB1250
bool
+config GPIO_TXX9
+ select GENERIC_GPIO
+ select HAVE_GPIO_LIB
+ bool
+
config CFE
bool
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index d0ca4d41bb742..87067e8fee9ea 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -81,6 +81,8 @@ obj-$(CONFIG_64BIT) += cpu-bugs64.o
obj-$(CONFIG_I8253) += i8253.o
+obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o
+
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/mips/kernel/gpio_txx9.c b/arch/mips/kernel/gpio_txx9.c
new file mode 100644
index 0000000000000..b1436a857998e
--- /dev/null
+++ b/arch/mips/kernel/gpio_txx9.c
@@ -0,0 +1,87 @@
+/*
+ * A gpio chip driver for TXx9 SoCs
+ *
+ * Copyright (C) 2008 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/gpio.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <asm/txx9pio.h>
+
+static DEFINE_SPINLOCK(txx9_gpio_lock);
+
+static struct txx9_pio_reg __iomem *txx9_pioptr;
+
+static int txx9_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ return __raw_readl(&txx9_pioptr->din) & (1 << offset);
+}
+
+static void txx9_gpio_set_raw(unsigned int offset, int value)
+{
+ u32 val;
+ val = __raw_readl(&txx9_pioptr->dout);
+ if (value)
+ val |= 1 << offset;
+ else
+ val &= ~(1 << offset);
+ __raw_writel(val, &txx9_pioptr->dout);
+}
+
+static void txx9_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&txx9_gpio_lock, flags);
+ txx9_gpio_set_raw(offset, value);
+ mmiowb();
+ spin_unlock_irqrestore(&txx9_gpio_lock, flags);
+}
+
+static int txx9_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
+{
+ spin_lock_irq(&txx9_gpio_lock);
+ __raw_writel(__raw_readl(&txx9_pioptr->dir) & ~(1 << offset),
+ &txx9_pioptr->dir);
+ mmiowb();
+ spin_unlock_irq(&txx9_gpio_lock);
+ return 0;
+}
+
+static int txx9_gpio_dir_out(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ spin_lock_irq(&txx9_gpio_lock);
+ txx9_gpio_set_raw(offset, value);
+ __raw_writel(__raw_readl(&txx9_pioptr->dir) | (1 << offset),
+ &txx9_pioptr->dir);
+ mmiowb();
+ spin_unlock_irq(&txx9_gpio_lock);
+ return 0;
+}
+
+static struct gpio_chip txx9_gpio_chip = {
+ .get = txx9_gpio_get,
+ .set = txx9_gpio_set,
+ .direction_input = txx9_gpio_dir_in,
+ .direction_output = txx9_gpio_dir_out,
+ .label = "TXx9",
+};
+
+int __init txx9_gpio_init(unsigned long baseaddr,
+ unsigned int base, unsigned int num)
+{
+ txx9_pioptr = ioremap(baseaddr, sizeof(struct txx9_pio_reg));
+ if (!txx9_pioptr)
+ return -ENODEV;
+ txx9_gpio_chip.base = base;
+ txx9_gpio_chip.ngpio = num;
+ return gpiochip_add(&txx9_gpio_chip);
+}
diff --git a/include/asm-mips/txx9pio.h b/include/asm-mips/txx9pio.h
new file mode 100644
index 0000000000000..3d6fa9f8d5135
--- /dev/null
+++ b/include/asm-mips/txx9pio.h
@@ -0,0 +1,29 @@
+/*
+ * include/asm-mips/txx9pio.h
+ * TX39/TX49 PIO controller definitions.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef __ASM_TXX9PIO_H
+#define __ASM_TXX9PIO_H
+
+#include <linux/types.h>
+
+struct txx9_pio_reg {
+ __u32 dout;
+ __u32 din;
+ __u32 dir;
+ __u32 od;
+ __u32 flag[2];
+ __u32 pol;
+ __u32 intc;
+ __u32 maskcpu;
+ __u32 maskext;
+};
+
+int txx9_gpio_init(unsigned long baseaddr,
+ unsigned int base, unsigned int num);
+
+#endif /* __ASM_TXX9PIO_H */
--
GitLab