1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
  7 */
  8
  9#include <linux/platform_device.h>
 10#include <linux/module.h>
 11#include <linux/leds.h>
 12#include <linux/mtd/physmap.h>
 13#include <linux/ssb/ssb.h>
 14#include <linux/interrupt.h>
 15#include <linux/reboot.h>
 16#include <linux/gpio.h>
 17#include <asm/mach-bcm47xx/bcm47xx.h>
 18
 19/* GPIO definitions for the WGT634U */
 20#define WGT634U_GPIO_LED	3
 21#define WGT634U_GPIO_RESET	2
 22#define WGT634U_GPIO_TP1	7
 23#define WGT634U_GPIO_TP2	6
 24#define WGT634U_GPIO_TP3	5
 25#define WGT634U_GPIO_TP4	4
 26#define WGT634U_GPIO_TP5	1
 27
 28static struct gpio_led wgt634u_leds[] = {
 29	{
 30		.name = "power",
 31		.gpio = WGT634U_GPIO_LED,
 32		.active_low = 1,
 33		.default_trigger = "heartbeat",
 34	},
 35};
 36
 37static struct gpio_led_platform_data wgt634u_led_data = {
 38	.num_leds =     ARRAY_SIZE(wgt634u_leds),
 39	.leds =         wgt634u_leds,
 40};
 41
 42static struct platform_device wgt634u_gpio_leds = {
 43	.name =         "leds-gpio",
 44	.id =           -1,
 45	.dev = {
 46		.platform_data = &wgt634u_led_data,
 47	}
 48};
 49
 50
 51/* 8MiB flash. The struct mtd_partition matches original Netgear WGT634U
 52   firmware. */
 53static struct mtd_partition wgt634u_partitions[] = {
 54	{
 55		.name       = "cfe",
 56		.offset     = 0,
 57		.size       = 0x60000,		/* 384k */
 58		.mask_flags = MTD_WRITEABLE 	/* force read-only */
 59	},
 60	{
 61		.name   = "config",
 62		.offset = 0x60000,
 63		.size   = 0x20000		/* 128k */
 64	},
 65	{
 66		.name   = "linux",
 67		.offset = 0x80000,
 68		.size   = 0x140000 		/* 1280k */
 69	},
 70	{
 71		.name   = "jffs",
 72		.offset = 0x1c0000,
 73		.size   = 0x620000 		/* 6272k */
 74	},
 75	{
 76		.name   = "nvram",
 77		.offset = 0x7e0000,
 78		.size   = 0x20000		/* 128k */
 79	},
 80};
 81
 82static struct physmap_flash_data wgt634u_flash_data = {
 83	.parts    = wgt634u_partitions,
 84	.nr_parts = ARRAY_SIZE(wgt634u_partitions)
 85};
 86
 87static struct resource wgt634u_flash_resource = {
 88	.flags = IORESOURCE_MEM,
 89};
 90
 91static struct platform_device wgt634u_flash = {
 92	.name          = "physmap-flash",
 93	.id            = 0,
 94	.dev           = { .platform_data = &wgt634u_flash_data, },
 95	.resource      = &wgt634u_flash_resource,
 96	.num_resources = 1,
 97};
 98
 99/* Platform devices */
100static struct platform_device *wgt634u_devices[] __initdata = {
101	&wgt634u_flash,
102	&wgt634u_gpio_leds,
103};
104
105static irqreturn_t gpio_interrupt(int irq, void *ignored)
106{
107	int state;
108
109	/* Interrupts are shared, check if the current one is
110	   a GPIO interrupt. */
111	if (!ssb_chipco_irq_status(&bcm47xx_bus.ssb.chipco,
112				   SSB_CHIPCO_IRQ_GPIO))
113		return IRQ_NONE;
114
115	state = gpio_get_value(WGT634U_GPIO_RESET);
116
117	/* Interrupt are level triggered, revert the interrupt polarity
118	   to clear the interrupt. */
119	gpio_polarity(WGT634U_GPIO_RESET, state);
120
121	if (!state) {
122		printk(KERN_INFO "Reset button pressed");
123		ctrl_alt_del();
124	}
125
126	return IRQ_HANDLED;
127}
128
129static int __init wgt634u_init(void)
130{
131	/* There is no easy way to detect that we are running on a WGT634U
132	 * machine. Use the MAC address as an heuristic. Netgear Inc. has
133	 * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
134	 */
135	u8 *et0mac;
136
137	if (bcm47xx_bus_type != BCM47XX_BUS_TYPE_SSB)
138		return -ENODEV;
139
140	et0mac = bcm47xx_bus.ssb.sprom.et0mac;
141
142	if (et0mac[0] == 0x00 &&
143	    ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
144	     (et0mac[1] == 0x0f && et0mac[2] == 0xb5))) {
145		struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
146
147		printk(KERN_INFO "WGT634U machine detected.\n");
148
149		if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
150				 gpio_interrupt, IRQF_SHARED,
151				 "WGT634U GPIO", &bcm47xx_bus.ssb.chipco)) {
152			gpio_direction_input(WGT634U_GPIO_RESET);
153			gpio_intmask(WGT634U_GPIO_RESET, 1);
154			ssb_chipco_irq_mask(&bcm47xx_bus.ssb.chipco,
155					    SSB_CHIPCO_IRQ_GPIO,
156					    SSB_CHIPCO_IRQ_GPIO);
157		}
158
159		wgt634u_flash_data.width = mcore->flash_buswidth;
160		wgt634u_flash_resource.start = mcore->flash_window;
161		wgt634u_flash_resource.end = mcore->flash_window
162					   + mcore->flash_window_size
163					   - 1;
164		return platform_add_devices(wgt634u_devices,
165					    ARRAY_SIZE(wgt634u_devices));
166	} else
167		return -ENODEV;
168}
169
170module_init(wgt634u_init);