[brcm2708] adds target used by rapsberry pi

Add support for Raspberry Pi / brcm2708 / 2835

Signed-off-by: Ian Ridge <ianridge [at] gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32825 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 436 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-3.3/0003-bcm2708-watchdog-driver.patch b/target/linux/brcm2708/patches-3.3/0003-bcm2708-watchdog-driver.patch
new file mode 100644
index 0000000000..cde3eef4e2
--- /dev/null
+++ b/target/linux/brcm2708/patches-3.3/0003-bcm2708-watchdog-driver.patch
@@ -0,0 +1,436 @@
+From ed8c2d720954efc5a440912292ed11da2f50aaea Mon Sep 17 00:00:00 2001
+From: popcornmix <popcornmix@gmail.com>
+Date: Tue, 17 Jan 2012 19:20:57 +0000
+Subject: [PATCH 3/7] bcm2708 watchdog driver
+
+Signed-off-by: popcornmix <popcornmix@gmail.com>
+---
+ drivers/watchdog/Kconfig        |    6 +
+ drivers/watchdog/Makefile       |    1 +
+ drivers/watchdog/bcm2708_wdog.c |  385 +++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 392 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/watchdog/bcm2708_wdog.c
+
+diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
+index 86b0735..7675ebc 100644
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -348,6 +348,12 @@ config IMX2_WDT
+ 	  To compile this driver as a module, choose M here: the
+ 	  module will be called imx2_wdt.
+ 
++config BCM2708_WDT
++	tristate "BCM2708 Watchdog"
++	depends on ARCH_BCM2708
++	help
++	  Enables BCM2708 watchdog support.
++
+ # AVR32 Architecture
+ 
+ config AT32AP700X_WDT
+diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
+index 55bd574..803f0bc 100644
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -54,6 +54,7 @@ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
+ obj-$(CONFIG_ADX_WATCHDOG) += adx_wdt.o
+ obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
+ obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
++obj-$(CONFIG_BCM2708_WDT) += bcm2708_wdog.o
+ 
+ # AVR32 Architecture
+ obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
+diff --git a/drivers/watchdog/bcm2708_wdog.c b/drivers/watchdog/bcm2708_wdog.c
+new file mode 100644
+index 0000000..dd33c35
+--- /dev/null
++++ b/drivers/watchdog/bcm2708_wdog.c
+@@ -0,0 +1,385 @@
++/*
++ *	Broadcom BCM2708 watchdog driver.
++ *
++ *	(c) Copyright 2010 Broadcom Europe Ltd
++ *
++ *	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.
++ *
++ *      BCM2708 watchdog driver. Loosely based on wdt driver.
++ */
++
++#include <linux/interrupt.h>
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/types.h>
++#include <linux/miscdevice.h>
++#include <linux/watchdog.h>
++#include <linux/fs.h>
++#include <linux/ioport.h>
++#include <linux/notifier.h>
++#include <linux/reboot.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/uaccess.h>
++#include <mach/platform.h>
++
++#include <asm/system.h>
++
++#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
++#define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
++
++static unsigned long wdog_is_open;
++static uint32_t wdog_ticks;	       /* Ticks to load into wdog timer */
++static char expect_close;
++
++/*
++ *	Module parameters
++ */
++
++#define WD_TIMO 10		       /* Default heartbeat = 60 seconds */
++static int heartbeat = WD_TIMO;	       /* Heartbeat in seconds */
++
++module_param(heartbeat, int, 0);
++MODULE_PARM_DESC(heartbeat,
++	"Watchdog heartbeat in seconds. (0 < heartbeat < 65536, default="
++				__MODULE_STRING(WD_TIMO) ")");
++
++static 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 DEFINE_SPINLOCK(wdog_lock);
++
++/**
++ *	Start the watchdog driver.
++ */
++
++static int wdog_start(unsigned long timeout)
++{
++	uint32_t cur;
++	unsigned long flags;
++	spin_lock_irqsave(&wdog_lock, flags);
++
++	/* enable the watchdog */
++	iowrite32(PM_PASSWORD | (timeout & PM_WDOG_TIME_SET), 
++		  __io_address(PM_WDOG));
++	cur = ioread32(__io_address(PM_RSTC));
++	iowrite32(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) |
++		  PM_RSTC_WRCFG_FULL_RESET, __io_address(PM_RSTC));
++
++	spin_unlock_irqrestore(&wdog_lock, flags);
++	return 0;
++}
++
++/**
++ *	Stop the watchdog driver.
++ */
++
++static int wdog_stop(void)
++{
++	iowrite32(PM_PASSWORD | PM_RSTC_RESET, __io_address(PM_RSTC));
++	printk(KERN_INFO "watchdog stopped\n");
++	return 0;
++}
++
++/**
++ *	Reload counter one with the watchdog heartbeat. We don't bother
++ *	reloading the cascade counter.
++ */
++
++static void wdog_ping(void)
++{
++	wdog_start(wdog_ticks);
++}
++
++/**
++ *	@t:		the new heartbeat value that needs to be set.
++ *
++ *	Set a new heartbeat value for the watchdog device. If the heartbeat
++ *	value is incorrect we keep the old value and return -EINVAL. If
++ *	successful we return 0.
++ */
++
++static int wdog_set_heartbeat(int t)
++{
++	if (t < 1 || t > WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET))
++		return -EINVAL;
++
++	heartbeat = t;
++	wdog_ticks = SECS_TO_WDOG_TICKS(t);
++	return 0;
++}
++
++/**
++ *	@file: file handle to the watchdog
++ *	@buf: buffer to write (unused as data does not matter here
++ *	@count: count of bytes
++ *	@ppos: pointer to the position to write. No seeks allowed
++ *
++ *	A write to a watchdog device is defined as a keepalive signal.
++ *	
++ *      if 'nowayout' is set then normally a close() is ignored. But
++ *      if you write 'V' first then the close() will stop the timer.
++ */
++
++static ssize_t wdog_write(struct file *file, const char __user *buf,
++						size_t count, loff_t *ppos)
++{
++	if (count) {
++		if (!nowayout) {
++			size_t i;
++
++			/* In case it was set long ago */
++			expect_close = 0;
++
++			for (i = 0; i != count; i++) {
++				char c;
++				if (get_user(c, buf + i))
++					return -EFAULT;
++				if (c == 'V')
++					expect_close = 42;
++			}
++		}
++		wdog_ping();
++	}
++	return count;
++}
++
++static int wdog_get_status(void)
++{
++	unsigned long flags;
++	int status = 0;
++	spin_lock_irqsave(&wdog_lock, flags);
++	/* FIXME: readback reset reason */
++	spin_unlock_irqrestore(&wdog_lock, flags);
++	return status;
++}
++
++static uint32_t wdog_get_remaining(void)
++{
++	uint32_t ret = ioread32(__io_address(PM_WDOG));
++	return ret & PM_WDOG_TIME_SET;
++}
++
++/**
++ *	@file: file handle to the device
++ *	@cmd: watchdog command
++ *	@arg: argument pointer
++ *
++ *	The watchdog API defines a common set of functions for all watchdogs
++ *	according to their available features. We only actually usefully support
++ *	querying capabilities and current status.
++ */
++
++static long wdog_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
++{
++	void __user *argp = (void __user *)arg;
++	int __user *p = argp;
++	int new_heartbeat;
++	int status;
++	int options;
++	uint32_t remaining;
++
++	struct watchdog_info ident = {
++		.options =		WDIOF_SETTIMEOUT|
++					WDIOF_MAGICCLOSE|
++					WDIOF_KEEPALIVEPING,
++		.firmware_version =	1,
++		.identity =		"BCM2708",
++	};
++
++	switch (cmd) {
++	case WDIOC_GETSUPPORT:
++		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
++	case WDIOC_GETSTATUS:
++		status = wdog_get_status();
++		return put_user(status, p);
++	case WDIOC_GETBOOTSTATUS:
++		return put_user(0, p);
++	case WDIOC_KEEPALIVE:
++		wdog_ping();
++		return 0;
++	case WDIOC_SETTIMEOUT:
++		if (get_user(new_heartbeat, p))
++			return -EFAULT;
++		if (wdog_set_heartbeat(new_heartbeat))
++			return -EINVAL;
++		wdog_ping();
++		/* Fall */
++	case WDIOC_GETTIMEOUT:
++		return put_user(heartbeat, p);
++	case WDIOC_GETTIMELEFT:
++		remaining = WDOG_TICKS_TO_SECS(wdog_get_remaining());
++		return put_user(remaining, p);
++	case WDIOC_SETOPTIONS:
++		if (get_user(options, p))
++			return -EFAULT;
++		if (options & WDIOS_DISABLECARD)
++			wdog_stop();
++		if (options & WDIOS_ENABLECARD)
++			wdog_start(wdog_ticks);
++		return 0;
++	default:
++		return -ENOTTY;
++	}
++}
++
++/**
++ *	@inode: inode of device
++ *	@file: file handle to device
++ *
++ *	The watchdog device has been opened. The watchdog device is single
++ *	open and on opening we load the counters.
++ */
++
++static int wdog_open(struct inode *inode, struct file *file)
++{
++	if (test_and_set_bit(0, &wdog_is_open))
++		return -EBUSY;
++	/*
++	 *	Activate
++	 */
++	wdog_start(wdog_ticks);
++	return nonseekable_open(inode, file);
++}
++
++/**
++ *	@inode: inode to board
++ *	@file: file handle to board
++ *
++ *	The watchdog has a configurable API. There is a religious dispute
++ *	between people who want their watchdog to be able to shut down and
++ *	those who want to be sure if the watchdog manager dies the machine
++ *	reboots. In the former case we disable the counters, in the latter
++ *	case you have to open it again very soon.
++ */
++
++static int wdog_release(struct inode *inode, struct file *file)
++{
++	if (expect_close == 42) {
++		wdog_stop();
++	} else {
++		printk(KERN_CRIT
++		 "wdt: WDT device closed unexpectedly.  WDT will not stop!\n");
++		wdog_ping();
++	}
++	clear_bit(0, &wdog_is_open);
++	expect_close = 0;
++	return 0;
++}
++
++/**
++ *	@this: our notifier block
++ *	@code: the event being reported
++ *	@unused: unused
++ *
++ *	Our notifier is called on system shutdowns. Turn the watchdog
++ *	off so that it does not fire during the next reboot.
++ */
++
++static int wdog_notify_sys(struct notifier_block *this, unsigned long code,
++	void *unused)
++{
++	if (code == SYS_DOWN || code == SYS_HALT)
++		wdog_stop();
++	return NOTIFY_DONE;
++}
++
++/*
++ *	Kernel Interfaces
++ */
++
++
++static const struct file_operations wdog_fops = {
++	.owner		= THIS_MODULE,
++	.llseek		= no_llseek,
++	.write		= wdog_write,
++	.unlocked_ioctl	= wdog_ioctl,
++	.open		= wdog_open,
++	.release	= wdog_release,
++};
++
++static struct miscdevice wdog_miscdev = {
++	.minor	= WATCHDOG_MINOR,
++	.name	= "watchdog",
++	.fops	= &wdog_fops,
++};
++
++/*
++ *	The WDT card needs to learn about soft shutdowns in order to
++ *	turn the timebomb registers off.
++ */
++
++static struct notifier_block wdog_notifier = {
++	.notifier_call = wdog_notify_sys,
++};
++
++/**
++ *	cleanup_module:
++ *
++ *	Unload the watchdog. You cannot do this with any file handles open.
++ *	If your watchdog is set to continue ticking on close and you unload
++ *	it, well it keeps ticking. We won't get the interrupt but the board
++ *	will not touch PC memory so all is fine. You just have to load a new
++ *	module in 60 seconds or reboot.
++ */
++
++static void __exit wdog_exit(void)
++{
++	misc_deregister(&wdog_miscdev);
++	unregister_reboot_notifier(&wdog_notifier);
++}
++
++static int __init wdog_init(void)
++{
++	int ret;
++
++	/* Check that the heartbeat value is within it's range;
++	   if not reset to the default */
++	if (wdog_set_heartbeat(heartbeat)) {
++		wdog_set_heartbeat(WD_TIMO);
++		printk(KERN_INFO "bcm2708_wdog: heartbeat value must be "
++			"0 < heartbeat < %d, using %d\n", 
++				WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET),
++				WD_TIMO);
++	}
++
++	ret = register_reboot_notifier(&wdog_notifier);
++	if (ret) {
++		printk(KERN_ERR
++		      "wdt: cannot register reboot notifier (err=%d)\n", ret);
++		goto out_reboot;
++	}
++
++	ret = misc_register(&wdog_miscdev);
++	if (ret) {
++		printk(KERN_ERR
++			"wdt: cannot register miscdev on minor=%d (err=%d)\n",
++							WATCHDOG_MINOR, ret);
++		goto out_misc;
++	}
++
++	printk(KERN_INFO "bcm2708 watchdog, heartbeat=%d sec (nowayout=%d)\n",
++		heartbeat, nowayout);
++	return 0;
++
++out_misc:
++	unregister_reboot_notifier(&wdog_notifier);
++out_reboot:
++	return ret;
++}
++
++module_init(wdog_init);
++module_exit(wdog_exit);
++
++MODULE_AUTHOR("Luke Diamand");
++MODULE_DESCRIPTION("Driver for BCM2708 watchdog");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
++MODULE_ALIAS_MISCDEV(TEMP_MINOR);
++MODULE_LICENSE("GPL");
++
+-- 
+1.7.5.4
+