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/ssb/ssb_embedded.h>
15 #include <linux/interrupt.h>
16 #include <linux/reboot.h>
17 #include <linux/gpio.h>
18 #include <asm/mach-bcm47xx/bcm47xx.h>
19
20 /* GPIO definitions for the WGT634U */
21 #define WGT634U_GPIO_LED 3
22 #define WGT634U_GPIO_RESET 2
23 #define WGT634U_GPIO_TP1 7
24 #define WGT634U_GPIO_TP2 6
25 #define WGT634U_GPIO_TP3 5
26 #define WGT634U_GPIO_TP4 4
27 #define WGT634U_GPIO_TP5 1
28
29 static struct gpio_led wgt634u_leds[] = {
30 {
31 .name = "power",
32 .gpio = WGT634U_GPIO_LED,
33 .active_low = 1,
34 .default_trigger = "heartbeat",
35 },
36 };
37
38 static struct gpio_led_platform_data wgt634u_led_data = {
39 .num_leds = ARRAY_SIZE(wgt634u_leds),
40 .leds = wgt634u_leds,
41 };
42
43 static struct platform_device wgt634u_gpio_leds = {
44 .name = "leds-gpio",
45 .id = -1,
46 .dev = {
47 .platform_data = &wgt634u_led_data,
48 }
49 };
50
51
52 /* 8MiB flash. The struct mtd_partition matches original Netgear WGT634U
53 firmware. */
54 static struct mtd_partition wgt634u_partitions[] = {
55 {
56 .name = "cfe",
57 .offset = 0,
58 .size = 0x60000, /* 384k */
59 .mask_flags = MTD_WRITEABLE /* force read-only */
60 },
61 {
62 .name = "config",
63 .offset = 0x60000,
64 .size = 0x20000 /* 128k */
65 },
66 {
67 .name = "linux",
68 .offset = 0x80000,
69 .size = 0x140000 /* 1280k */
70 },
71 {
72 .name = "jffs",
73 .offset = 0x1c0000,
74 .size = 0x620000 /* 6272k */
75 },
76 {
77 .name = "nvram",
78 .offset = 0x7e0000,
79 .size = 0x20000 /* 128k */
80 },
81 };
82
83 static struct physmap_flash_data wgt634u_flash_data = {
84 .parts = wgt634u_partitions,
85 .nr_parts = ARRAY_SIZE(wgt634u_partitions)
86 };
87
88 static struct resource wgt634u_flash_resource = {
89 .flags = IORESOURCE_MEM,
90 };
91
92 static struct platform_device wgt634u_flash = {
93 .name = "physmap-flash",
94 .id = 0,
95 .dev = { .platform_data = &wgt634u_flash_data, },
96 .resource = &wgt634u_flash_resource,
97 .num_resources = 1,
98 };
99
100 /* Platform devices */
101 static struct platform_device *wgt634u_devices[] __initdata = {
102 &wgt634u_flash,
103 &wgt634u_gpio_leds,
104 };
105
gpio_interrupt(int irq,void * ignored)106 static irqreturn_t gpio_interrupt(int irq, void *ignored)
107 {
108 int state;
109
110 /* Interrupts are shared, check if the current one is
111 a GPIO interrupt. */
112 if (!ssb_chipco_irq_status(&bcm47xx_bus.ssb.chipco,
113 SSB_CHIPCO_IRQ_GPIO))
114 return IRQ_NONE;
115
116 state = gpio_get_value(WGT634U_GPIO_RESET);
117
118 /* Interrupt are level triggered, revert the interrupt polarity
119 to clear the interrupt. */
120 ssb_gpio_polarity(&bcm47xx_bus.ssb, 1 << WGT634U_GPIO_RESET,
121 state ? 1 << WGT634U_GPIO_RESET : 0);
122
123 if (!state) {
124 printk(KERN_INFO "Reset button pressed");
125 ctrl_alt_del();
126 }
127
128 return IRQ_HANDLED;
129 }
130
wgt634u_init(void)131 static int __init wgt634u_init(void)
132 {
133 /* There is no easy way to detect that we are running on a WGT634U
134 * machine. Use the MAC address as an heuristic. Netgear Inc. has
135 * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
136 */
137 u8 *et0mac;
138
139 if (bcm47xx_bus_type != BCM47XX_BUS_TYPE_SSB)
140 return -ENODEV;
141
142 et0mac = bcm47xx_bus.ssb.sprom.et0mac;
143
144 if (et0mac[0] == 0x00 &&
145 ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
146 (et0mac[1] == 0x0f && et0mac[2] == 0xb5))) {
147 struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
148
149 printk(KERN_INFO "WGT634U machine detected.\n");
150
151 if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
152 gpio_interrupt, IRQF_SHARED,
153 "WGT634U GPIO", &bcm47xx_bus.ssb.chipco)) {
154 gpio_direction_input(WGT634U_GPIO_RESET);
155 ssb_gpio_intmask(&bcm47xx_bus.ssb,
156 1 << WGT634U_GPIO_RESET,
157 1 << WGT634U_GPIO_RESET);
158 ssb_chipco_irq_mask(&bcm47xx_bus.ssb.chipco,
159 SSB_CHIPCO_IRQ_GPIO,
160 SSB_CHIPCO_IRQ_GPIO);
161 }
162
163 wgt634u_flash_data.width = mcore->pflash.buswidth;
164 wgt634u_flash_resource.start = mcore->pflash.window;
165 wgt634u_flash_resource.end = mcore->pflash.window
166 + mcore->pflash.window_size
167 - 1;
168 return platform_add_devices(wgt634u_devices,
169 ARRAY_SIZE(wgt634u_devices));
170 } else
171 return -ENODEV;
172 }
173
174 module_init(wgt634u_init);
175