5 files changed, 286 insertions, 1 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b786e68914d4..5c8c1a89be73 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -368,6 +368,8 @@ config ARCH_NS9XXX
 config ARCH_MXC
         bool "Freescale MXC/iMX-based"
         select ARCH_MTD_XIP
+        select GENERIC_GPIO
+        select HAVE_GPIO_LIB
         help
           Support for Freescale MXC/iMX-based family of processors
 
diff --git a/arch/arm/mach-mx3/devices.c b/arch/arm/mach-mx3/devices.c
index 1bc6d23a1d58..5c0320fce5b6 100644
--- a/arch/arm/mach-mx3/devices.c
+++ b/arch/arm/mach-mx3/devices.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/serial.h>
+#include <linux/gpio.h>
 #include <asm/hardware.h>
 #include <asm/arch/imx-uart.h>
 
@@ -151,3 +152,29 @@ int __init imx_init_uart(int uart_no, struct imxuart_platform_data *pdata)
         return 0;
 }
 
+/* GPIO port description */
+static struct mxc_gpio_port imx_gpio_ports[] = {
+        [0] = {
+                .chip.label = "gpio-0",
+                .base = IO_ADDRESS(GPIO1_BASE_ADDR),
+                .irq = MXC_INT_GPIO1,
+                .virtual_irq_start = MXC_GPIO_INT_BASE
+        },
+        [1] = {
+                .chip.label = "gpio-1",
+                .base = IO_ADDRESS(GPIO2_BASE_ADDR),
+                .irq = MXC_INT_GPIO2,
+                .virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN
+        },
+        [2] = {
+                .chip.label = "gpio-2",
+                .base = IO_ADDRESS(GPIO3_BASE_ADDR),
+                .irq = MXC_INT_GPIO3,
+                .virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN * 2
+        }
+};
+
+int __init mxc_register_gpios(void)
+{
+        return mxc_gpio_init(imx_gpio_ports, ARRAY_SIZE(imx_gpio_ports));
+}
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index 3eb181cb7afb..66272a6fc323 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -3,4 +3,4 @@
 #
 
 # Common support
-obj-y := irq.o clock.o
+obj-y := irq.o clock.o gpio.o
diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c
new file mode 100644
index 000000000000..4a7736717d86
--- /dev/null
+++ b/arch/arm/plat-mxc/gpio.c
@@ -0,0 +1,253 @@
+/*
+ * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * Based on code from Freescale,
+ * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <asm/hardware.h>
+#include <asm-generic/bug.h>
+
+static struct mxc_gpio_port *mxc_gpio_ports;
+static int gpio_table_size;
+
+/* Note: This driver assumes 32 GPIOs are handled in one register */
+
+static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index)
+{
+        __raw_writel(1 << index, port->base + GPIO_ISR);
+}
+
+static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index,
+                                int enable)
+{
+        u32 l;
+
+        l = __raw_readl(port->base + GPIO_IMR);
+        l = (l & (~(1 << index))) | (!!enable << index);
+        __raw_writel(l, port->base + GPIO_IMR);
+}
+
+static void gpio_ack_irq(u32 irq)
+{
+        u32 gpio = irq_to_gpio(irq);
+        _clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
+}
+
+static void gpio_mask_irq(u32 irq)
+{
+        u32 gpio = irq_to_gpio(irq);
+        _set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
+}
+
+static void gpio_unmask_irq(u32 irq)
+{
+        u32 gpio = irq_to_gpio(irq);
+        _set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
+}
+
+static int gpio_set_irq_type(u32 irq, u32 type)
+{
+        u32 gpio = irq_to_gpio(irq);
+        struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
+        u32 bit, val;
+        int edge;
+        void __iomem *reg = port->base;
+
+        switch (type) {
+        case IRQT_RISING:
+                edge = GPIO_INT_RISE_EDGE;
+                break;
+        case IRQT_FALLING:
+                edge = GPIO_INT_FALL_EDGE;
+                break;
+        case IRQT_LOW:
+                edge = GPIO_INT_LOW_LEV;
+                break;
+        case IRQT_HIGH:
+                edge = GPIO_INT_HIGH_LEV;
+                break;
+        default:        /* this includes IRQT_BOTHEDGE */
+                return -EINVAL;
+        }
+
+        reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
+        bit = gpio & 0xf;
+        val = __raw_readl(reg) & ~(0x3 << (bit << 1));
+        __raw_writel(val | (edge << (bit << 1)), reg);
+        _clear_gpio_irqstatus(port, gpio & 0x1f);
+
+        return 0;
+}
+
+/* handle n interrupts in one status register */
+static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
+{
+        u32 gpio_irq_no;
+
+        gpio_irq_no = port->virtual_irq_start;
+        for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
+
+                if ((irq_stat & 1) == 0)
+                        continue;
+
+                BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));
+                irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
+                                &irq_desc[gpio_irq_no]);
+        }
+}
+
+#ifdef CONFIG_ARCH_MX3
+/* MX3 has one interrupt *per* gpio port */
+static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
+{
+        u32 irq_stat;
+        struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);
+
+        irq_stat = __raw_readl(port->base + GPIO_ISR) &
+                        __raw_readl(port->base + GPIO_IMR);
+        BUG_ON(!irq_stat);
+        mxc_gpio_irq_handler(port, irq_stat);
+}
+#endif
+
+#ifdef CONFIG_ARCH_MX2
+/* MX2 has one interrupt *for all* gpio ports */
+static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
+{
+        int i;
+        u32 irq_msk, irq_stat;
+        struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);
+
+        /* walk through all interrupt status registers */
+        for (i = 0; i < gpio_table_size; i++) {
+                irq_msk = __raw_readl(port[i].base + GPIO_IMR);
+                if (!irq_msk)
+                        continue;
+
+                irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk;
+                if (irq_stat)
+                        mxc_gpio_irq_handler(&port[i], irq_stat);
+        }
+}
+#endif
+
+static struct irq_chip gpio_irq_chip = {
+        .ack = gpio_ack_irq,
+        .mask = gpio_mask_irq,
+        .unmask = gpio_unmask_irq,
+        .set_type = gpio_set_irq_type,
+};
+
+static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
+                                int dir)
+{
+        struct mxc_gpio_port *port =
+                container_of(chip, struct mxc_gpio_port, chip);
+        u32 l;
+
+        l = __raw_readl(port->base + GPIO_GDIR);
+        if (dir)
+                l |= 1 << offset;
+        else
+                l &= ~(1 << offset);
+        __raw_writel(l, port->base + GPIO_GDIR);
+}
+
+static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct mxc_gpio_port *port =
+                container_of(chip, struct mxc_gpio_port, chip);
+        void __iomem *reg = port->base + GPIO_DR;
+        u32 l;
+
+        l = (__raw_readl(reg) & (~(1 << offset))) | (value << offset);
+        __raw_writel(l, reg);
+}
+
+static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        struct mxc_gpio_port *port =
+                container_of(chip, struct mxc_gpio_port, chip);
+
+        return (__raw_readl(port->base + GPIO_DR) >> offset) & 1;
+}
+
+static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+        _set_gpio_direction(chip, offset, 0);
+        return 0;
+}
+
+static int mxc_gpio_direction_output(struct gpio_chip *chip,
+                                     unsigned offset, int value)
+{
+        _set_gpio_direction(chip, offset, 1);
+        mxc_gpio_set(chip, offset, value);
+        return 0;
+}
+
+int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
+{
+        int i, j;
+
+        /* save for local usage */
+        mxc_gpio_ports = port;
+        gpio_table_size = cnt;
+
+        printk(KERN_INFO "MXC GPIO hardware\n");
+
+        for (i = 0; i < cnt; i++) {
+                /* disable the interrupt and clear the status */
+                __raw_writel(0, port[i].base + GPIO_IMR);
+                __raw_writel(~0, port[i].base + GPIO_ISR);
+                for (j = port[i].virtual_irq_start;
+                        j < port[i].virtual_irq_start + 32; j++) {
+                        set_irq_chip(j, &gpio_irq_chip);
+                        set_irq_handler(j, handle_edge_irq);
+                        set_irq_flags(j, IRQF_VALID);
+                }
+
+                /* register gpio chip */
+                port[i].chip.direction_input = mxc_gpio_direction_input;
+                port[i].chip.direction_output = mxc_gpio_direction_output;
+                port[i].chip.get = mxc_gpio_get;
+                port[i].chip.set = mxc_gpio_set;
+                port[i].chip.base = i * 32;
+                port[i].chip.ngpio = 32;
+
+                /* its a serious configuration bug when it fails */
+                BUG_ON( gpiochip_add(&port[i].chip) < 0 );
+
+#ifdef CONFIG_ARCH_MX3
+                /* setup one handler for each entry */
+                set_irq_chained_handler(port[i].irq, mx3_gpio_irq_handler);
+                set_irq_data(port[i].irq, &port[i]);
+#endif
+        }
+
+#ifdef CONFIG_ARCH_MX2
+        /* setup one handler for all GPIO interrupts */
+        set_irq_chained_handler(port[0].irq, mx2_gpio_irq_handler);
+        set_irq_data(port[0].irq, port);
+#endif
+        return 0;
+}
diff --git a/arch/arm/plat-mxc/irq.c b/arch/arm/plat-mxc/irq.c
index 2ad5a6917b3f..88f0cfababda 100644
--- a/arch/arm/plat-mxc/irq.c
+++ b/arch/arm/plat-mxc/irq.c
@@ -71,5 +71,8 @@ void __init mxc_init_irq(void)
         reg |= (0xF << 28);
         __raw_writel(reg, AVIC_NIPRIORITY6);
 
+        /* init architectures chained interrupt handler */
+        mxc_register_gpios();
+
         printk(KERN_INFO "MXC IRQ initialized\n");
 }