x86: add support for the RDC R-321x SoC

This patch adds support for the RDC R-321x system-on-chip,
also known as R-861x-(G). It uses the generic GPIO API and
has support for the on-chip hardware watchdog.

Build-fix from: Randy Dunlap <randy.dunlap@oracle.com>

Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed, 439 insertions, 0 deletions

diff --git a/arch/x86/mach-rdc321x/Makefile b/arch/x86/mach-rdc321x/Makefile
new file mode 100644
index 000000000000..1faac8125e3d
--- /dev/null
+++ b/arch/x86/mach-rdc321x/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the RDC321x specific parts of the kernel
+#
+obj-$(CONFIG_X86_RDC321X)        := gpio.o platform.o wdt.o
+
diff --git a/arch/x86/mach-rdc321x/gpio.c b/arch/x86/mach-rdc321x/gpio.c
new file mode 100644
index 000000000000..031269163bd6
--- /dev/null
+++ b/arch/x86/mach-rdc321x/gpio.c
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
+ *      RDC321x architecture specific GPIO support
+ *
+ *  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.
+ */
+
+#include <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+
+#include <asm/mach-rdc321x/rdc321x_defs.h>
+
+static inline int rdc_gpio_is_valid(unsigned gpio)
+{
+        return (gpio <= RDC_MAX_GPIO);
+}
+
+static unsigned int rdc_gpio_read(unsigned gpio)
+{
+        unsigned int val;
+
+        val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x84:0x48));
+        outl(val, RDC3210_CFGREG_ADDR);
+        udelay(10);
+        val = inl(RDC3210_CFGREG_DATA);
+        val |= (0x1 << (gpio & 0x1F));
+        outl(val, RDC3210_CFGREG_DATA);
+        udelay(10);
+        val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x88:0x4C));
+        outl(val, RDC3210_CFGREG_ADDR);
+        udelay(10);
+        val = inl(RDC3210_CFGREG_DATA);
+
+        return val;
+}
+
+static void rdc_gpio_write(unsigned int val)
+{
+        if (val) {
+                outl(val, RDC3210_CFGREG_DATA);
+                udelay(10);
+        }
+}
+
+int rdc_gpio_get_value(unsigned gpio)
+{
+        if (rdc_gpio_is_valid(gpio))
+                return (int)rdc_gpio_read(gpio);
+        else
+                return -EINVAL;
+}
+EXPORT_SYMBOL(rdc_gpio_get_value);
+
+void rdc_gpio_set_value(unsigned gpio, int value)
+{
+        unsigned int val;
+
+        if (!rdc_gpio_is_valid(gpio))
+                return;
+
+        val = rdc_gpio_read(gpio);
+
+        if (value)
+                val &= ~(0x1 << (gpio & 0x1F));
+        else
+                val |= (0x1 << (gpio & 0x1F));
+
+        rdc_gpio_write(val);
+}
+EXPORT_SYMBOL(rdc_gpio_set_value);
+
+int rdc_gpio_direction_input(unsigned gpio)
+{
+        return 0;
+}
+EXPORT_SYMBOL(rdc_gpio_direction_input);
+
+int rdc_gpio_direction_output(unsigned gpio, int value)
+{
+        return 0;
+}
+EXPORT_SYMBOL(rdc_gpio_direction_output);
+
+
diff --git a/arch/x86/mach-rdc321x/platform.c b/arch/x86/mach-rdc321x/platform.c
new file mode 100644
index 000000000000..dda6024a5862
--- /dev/null
+++ b/arch/x86/mach-rdc321x/platform.c
@@ -0,0 +1,68 @@
+/*
+ *  Generic RDC321x platform devices
+ *
+ *  Copyright (C) 2007 Florian Fainelli <florian@openwrt.org>
+ *
+ *  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/kernel.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/version.h>
+#include <linux/leds.h>
+
+#include <asm/gpio.h>
+
+/* LEDS */
+static struct gpio_led default_leds[] = {
+        { .name = "rdc:dmz", .gpio = 1, },
+};
+
+static struct gpio_led_platform_data rdc321x_led_data = {
+        .num_leds = ARRAY_SIZE(default_leds),
+        .leds = default_leds,
+};
+
+static struct platform_device rdc321x_leds = {
+        .name = "leds-gpio",
+        .id = -1,
+        .dev = {
+                .platform_data = &rdc321x_led_data,
+        }
+};
+
+/* Watchdog */
+static struct platform_device rdc321x_wdt = {
+        .name = "rdc321x-wdt",
+        .id = -1,
+        .num_resources = 0,
+};
+
+static struct platform_device *rdc321x_devs[] = {
+        &rdc321x_leds,
+        &rdc321x_wdt
+};
+
+static int __init rdc_board_setup(void)
+{
+        return platform_add_devices(rdc321x_devs, ARRAY_SIZE(rdc321x_devs));
+}
+
+arch_initcall(rdc_board_setup);
diff --git a/arch/x86/mach-rdc321x/wdt.c b/arch/x86/mach-rdc321x/wdt.c
new file mode 100644
index 000000000000..ec5625ae7061
--- /dev/null
+++ b/arch/x86/mach-rdc321x/wdt.c
@@ -0,0 +1,275 @@
+/*
+ * RDC321x watchdog driver
+ *
+ * Copyright (C) 2007 Florian Fainelli <florian@openwrt.org>
+ *
+ * This driver is highly inspired from the cpu5_wdt driver
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/mach-rdc321x/rdc321x_defs.h>
+
+#define RDC_WDT_MASK    0x80000000 /* Mask */
+#define RDC_WDT_EN      0x00800000 /* Enable bit */
+#define RDC_WDT_WTI     0x00200000 /* Generate CPU reset/NMI/WDT on timeout */
+#define RDC_WDT_RST     0x00100000 /* Reset bit */
+#define RDC_WDT_WIF     0x00040000 /* WDT IRQ Flag */
+#define RDC_WDT_IRT     0x00000100 /* IRQ Routing table */
+#define RDC_WDT_CNT     0x00000001 /* WDT count */
+
+#define RDC_CLS_TMR     0x80003844 /* Clear timer */
+
+#define RDC_WDT_INTERVAL        (HZ/10+1)
+
+int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int ticks = 1000;
+
+/* some device data */
+
+static struct {
+        struct completion stop;
+        volatile int running;
+        struct timer_list timer;
+        volatile int queue;
+        int default_ticks;
+        unsigned long inuse;
+} rdc321x_wdt_device;
+
+/* generic helper functions */
+
+static void rdc321x_wdt_trigger(unsigned long unused)
+{
+        if (rdc321x_wdt_device.running)
+                ticks--;
+
+        /* keep watchdog alive */
+        outl(RDC_WDT_EN|inl(RDC3210_CFGREG_DATA), RDC3210_CFGREG_DATA);
+
+        /* requeue?? */
+        if (rdc321x_wdt_device.queue && ticks)
+                mod_timer(&rdc321x_wdt_device.timer,
+                                jiffies + RDC_WDT_INTERVAL);
+        else {
+                /* ticks doesn't matter anyway */
+                complete(&rdc321x_wdt_device.stop);
+        }
+
+}
+
+static void rdc321x_wdt_reset(void)
+{
+        ticks = rdc321x_wdt_device.default_ticks;
+}
+
+static void rdc321x_wdt_start(void)
+{
+        if (!rdc321x_wdt_device.queue) {
+                rdc321x_wdt_device.queue = 1;
+
+                /* Clear the timer */
+                outl(RDC_CLS_TMR, RDC3210_CFGREG_ADDR);
+
+                /* Enable watchdog and set the timeout to 81.92 us */
+                outl(RDC_WDT_EN|RDC_WDT_CNT, RDC3210_CFGREG_DATA);
+
+                mod_timer(&rdc321x_wdt_device.timer,
+                                jiffies + RDC_WDT_INTERVAL);
+        }
+
+        /* if process dies, counter is not decremented */
+        rdc321x_wdt_device.running++;
+}
+
+static int rdc321x_wdt_stop(void)
+{
+        if (rdc321x_wdt_device.running)
+                rdc321x_wdt_device.running = 0;
+
+        ticks = rdc321x_wdt_device.default_ticks;
+
+        return -EIO;
+}
+
+/* filesystem operations */
+
+static int rdc321x_wdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
+                return -EBUSY;
+
+        return nonseekable_open(inode, file);
+}
+
+static int rdc321x_wdt_release(struct inode *inode, struct file *file)
+{
+        clear_bit(0, &rdc321x_wdt_device.inuse);
+        return 0;
+}
+
+static int rdc321x_wdt_ioctl(struct inode *inode, struct file *file,
+                                unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        unsigned int value;
+        static struct watchdog_info ident = {
+                .options = WDIOF_CARDRESET,
+                .identity = "RDC321x WDT",
+        };
+
+        switch (cmd) {
+        case WDIOC_KEEPALIVE:
+                rdc321x_wdt_reset();
+                break;
+        case WDIOC_GETSTATUS:
+                /* Read the value from the DATA register */
+                value = inl(RDC3210_CFGREG_DATA);
+                if (copy_to_user(argp, &value, sizeof(int)))
+                        return -EFAULT;
+                break;
+        case WDIOC_GETSUPPORT:
+                if (copy_to_user(argp, &ident, sizeof(ident)))
+                        return -EFAULT;
+                break;
+        case WDIOC_SETOPTIONS:
+                if (copy_from_user(&value, argp, sizeof(int)))
+                        return -EFAULT;
+                switch (value) {
+                case WDIOS_ENABLECARD:
+                        rdc321x_wdt_start();
+                        break;
+                case WDIOS_DISABLECARD:
+                        return rdc321x_wdt_stop();
+                default:
+                        return -EINVAL;
+                }
+                break;
+        default:
+                return -ENOTTY;
+        }
+        return 0;
+}
+
+static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
+                                size_t count, loff_t *ppos)
+{
+        if (!count)
+                return -EIO;
+
+        rdc321x_wdt_reset();
+
+        return count;
+}
+
+static const struct file_operations rdc321x_wdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .ioctl          = rdc321x_wdt_ioctl,
+        .open           = rdc321x_wdt_open,
+        .write          = rdc321x_wdt_write,
+        .release        = rdc321x_wdt_release,
+};
+
+static struct miscdevice rdc321x_wdt_misc = {
+        .minor  = WATCHDOG_MINOR,
+        .name   = "watchdog",
+        .fops   = &rdc321x_wdt_fops,
+};
+
+static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)
+{
+        int err;
+
+        err = misc_register(&rdc321x_wdt_misc);
+        if (err < 0) {
+                printk(KERN_ERR PFX "watchdog misc_register failed\n");
+                return err;
+        }
+
+        /* Reset the watchdog */
+        outl(RDC_WDT_RST, RDC3210_CFGREG_DATA);
+
+        init_completion(&rdc321x_wdt_device.stop);
+        rdc321x_wdt_device.queue = 0;
+
+        clear_bit(0, &rdc321x_wdt_device.inuse);
+
+        setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
+
+        rdc321x_wdt_device.default_ticks = ticks;
+
+        printk(KERN_INFO PFX "watchdog init success\n");
+
+        return 0;
+}
+
+static int rdc321x_wdt_remove(struct platform_device *pdev)
+{
+        if (rdc321x_wdt_device.queue) {
+                rdc321x_wdt_device.queue = 0;
+                wait_for_completion(&rdc321x_wdt_device.stop);
+        }
+
+        misc_deregister(&rdc321x_wdt_misc);
+
+        return 0;
+}
+
+static struct platform_driver rdc321x_wdt_driver = {
+        .probe = rdc321x_wdt_probe,
+        .remove = rdc321x_wdt_remove,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "rdc321x-wdt",
+        },
+};
+
+static int __init rdc321x_wdt_init(void)
+{
+        return platform_driver_register(&rdc321x_wdt_driver);
+}
+
+static void __exit rdc321x_wdt_exit(void)
+{
+        platform_driver_unregister(&rdc321x_wdt_driver);
+}
+
+module_init(rdc321x_wdt_init);
+module_exit(rdc321x_wdt_exit);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("RDC321x watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);