ARM: 7035/1: mach-ks8695: move GPIO driver to GPIO subsystem

As per example from the other ARM boards, push the KS8695 GPIO
driver down to the GPIO subsystem so it can be consolidated.

Cc: zeal <zealcook@gmail.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: Daniel Silverstone <dsilvers@simtec.co.uk>
Acked-by: Simtec Linux Team <linux@simtec.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 318 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-ks8695.c b/drivers/gpio/gpio-ks8695.c
new file mode 100644
index 000000000000..b3fdfe1d262f
--- /dev/null
+++ b/drivers/gpio/gpio-ks8695.c
@@ -0,0 +1,318 @@
+/*
+ * arch/arm/mach-ks8695/gpio.c
+ *
+ * Copyright (C) 2006 Andrew Victor
+ * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
+ *                     Daniel Silverstone <dsilvers@simtec.co.uk>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/mach/irq.h>
+
+#include <mach/regs-gpio.h>
+
+/*
+ * Configure a GPIO line for either GPIO function, or its internal
+ * function (Interrupt, Timer, etc).
+ */
+static void ks8695_gpio_mode(unsigned int pin, short gpio)
+{
+        unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
+        unsigned long x, flags;
+
+        if (pin > KS8695_GPIO_5)        /* only GPIO 0..5 have internal functions */
+                return;
+
+        local_irq_save(flags);
+
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
+        if (gpio)                       /* GPIO: set bit to 0 */
+                x &= ~enable[pin];
+        else                            /* Internal function: set bit to 1 */
+                x |= enable[pin];
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
+
+        local_irq_restore(flags);
+}
+
+
+static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
+
+/*
+ * Configure GPIO pin as external interrupt source.
+ */
+int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
+{
+        unsigned long x, flags;
+
+        if (pin > KS8695_GPIO_3)        /* only GPIO 0..3 can generate IRQ */
+                return -EINVAL;
+
+        local_irq_save(flags);
+
+        /* set pin as input */
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
+        x &= ~IOPM(pin);
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
+
+        local_irq_restore(flags);
+
+        /* Set IRQ triggering type */
+        irq_set_irq_type(gpio_irq[pin], type);
+
+        /* enable interrupt mode */
+        ks8695_gpio_mode(pin, 0);
+
+        return 0;
+}
+EXPORT_SYMBOL(ks8695_gpio_interrupt);
+
+
+
+/* .... Generic GPIO interface .............................................. */
+
+/*
+ * Configure the GPIO line as an input.
+ */
+static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
+{
+        unsigned long x, flags;
+
+        if (pin > KS8695_GPIO_15)
+                return -EINVAL;
+
+        /* set pin to GPIO mode */
+        ks8695_gpio_mode(pin, 1);
+
+        local_irq_save(flags);
+
+        /* set pin as input */
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
+        x &= ~IOPM(pin);
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
+
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+
+/*
+ * Configure the GPIO line as an output, with default state.
+ */
+static int ks8695_gpio_direction_output(struct gpio_chip *gc,
+                                        unsigned int pin, int state)
+{
+        unsigned long x, flags;
+
+        if (pin > KS8695_GPIO_15)
+                return -EINVAL;
+
+        /* set pin to GPIO mode */
+        ks8695_gpio_mode(pin, 1);
+
+        local_irq_save(flags);
+
+        /* set line state */
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
+        if (state)
+                x |= IOPD(pin);
+        else
+                x &= ~IOPD(pin);
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
+
+        /* set pin as output */
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
+        x |= IOPM(pin);
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
+
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+
+/*
+ * Set the state of an output GPIO line.
+ */
+static void ks8695_gpio_set_value(struct gpio_chip *gc,
+                                  unsigned int pin, int state)
+{
+        unsigned long x, flags;
+
+        if (pin > KS8695_GPIO_15)
+                return;
+
+        local_irq_save(flags);
+
+        /* set output line state */
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
+        if (state)
+                x |= IOPD(pin);
+        else
+                x &= ~IOPD(pin);
+        __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
+
+        local_irq_restore(flags);
+}
+
+
+/*
+ * Read the state of a GPIO line.
+ */
+static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
+{
+        unsigned long x;
+
+        if (pin > KS8695_GPIO_15)
+                return -EINVAL;
+
+        x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
+        return (x & IOPD(pin)) != 0;
+}
+
+
+/*
+ * Map GPIO line to IRQ number.
+ */
+static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
+{
+        if (pin > KS8695_GPIO_3)        /* only GPIO 0..3 can generate IRQ */
+                return -EINVAL;
+
+        return gpio_irq[pin];
+}
+
+/*
+ * Map IRQ number to GPIO line.
+ */
+int irq_to_gpio(unsigned int irq)
+{
+        if ((irq < KS8695_IRQ_EXTERN0) || (irq > KS8695_IRQ_EXTERN3))
+                return -EINVAL;
+
+        return (irq - KS8695_IRQ_EXTERN0);
+}
+EXPORT_SYMBOL(irq_to_gpio);
+
+/* GPIOLIB interface */
+
+static struct gpio_chip ks8695_gpio_chip = {
+        .label                  = "KS8695",
+        .direction_input        = ks8695_gpio_direction_input,
+        .direction_output       = ks8695_gpio_direction_output,
+        .get                    = ks8695_gpio_get_value,
+        .set                    = ks8695_gpio_set_value,
+        .to_irq                 = ks8695_gpio_to_irq,
+        .base                   = 0,
+        .ngpio                  = 16,
+        .can_sleep              = 0,
+};
+
+/* Register the GPIOs */
+void ks8695_register_gpios(void)
+{
+        if (gpiochip_add(&ks8695_gpio_chip))
+                printk(KERN_ERR "Unable to register core GPIOs\n");
+}
+
+/* .... Debug interface ..................................................... */
+
+#ifdef CONFIG_DEBUG_FS
+
+static int ks8695_gpio_show(struct seq_file *s, void *unused)
+{
+        unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
+        unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
+        unsigned long mode, ctrl, data;
+        int i;
+
+        mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
+        ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
+        data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
+
+        seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
+
+        for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
+                seq_printf(s, "%i:\t", i);
+
+                seq_printf(s, "%s\t", (mode & IOPM(i)) ? "Output" : "Input");
+
+                if (i <= KS8695_GPIO_3) {
+                        if (ctrl & enable[i]) {
+                                seq_printf(s, "EXT%i ", i);
+
+                                switch ((ctrl & intmask[i]) >> (4 * i)) {
+                                        case IOPC_TM_LOW:
+                                                seq_printf(s, "(Low)");         break;
+                                        case IOPC_TM_HIGH:
+                                                seq_printf(s, "(High)");        break;
+                                        case IOPC_TM_RISING:
+                                                seq_printf(s, "(Rising)");      break;
+                                        case IOPC_TM_FALLING:
+                                                seq_printf(s, "(Falling)");     break;
+                                        case IOPC_TM_EDGE:
+                                                seq_printf(s, "(Edges)");       break;
+                                }
+                        }
+                        else
+                                seq_printf(s, "GPIO\t");
+                }
+                else if (i <= KS8695_GPIO_5) {
+                        if (ctrl & enable[i])
+                                seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
+                        else
+                                seq_printf(s, "GPIO\t");
+                }
+                else
+                        seq_printf(s, "GPIO\t");
+
+                seq_printf(s, "\t");
+
+                seq_printf(s, "%i\n", (data & IOPD(i)) ? 1 : 0);
+        }
+        return 0;
+}
+
+static int ks8695_gpio_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, ks8695_gpio_show, NULL);
+}
+
+static const struct file_operations ks8695_gpio_operations = {
+        .open           = ks8695_gpio_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init ks8695_gpio_debugfs_init(void)
+{
+        /* /sys/kernel/debug/ks8695_gpio */
+        (void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
+        return 0;
+}
+postcore_initcall(ks8695_gpio_debugfs_init);
+
+#endif