4 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
5 * Copyright (C) 2006 Tower Technologies
7 * based on ixdp425-setup.c:
8 * Copyright (C) 2003-2004 MontaVista Software, Inc.
9 * based on nslu2-power.c:
10 * Copyright (C) 2005 Tower Technologies
11 * based on nslu2-io.c:
12 * Copyright (C) 2004 Karen Spearel
14 * Author: Alessandro Zummo <a.zummo@towertech.it>
15 * Author: Michael Westerhof <mwester@dls.net>
16 * Author: Rod Whitby <rod@whitby.id.au>
17 * Maintainers: http://www.nslu2-linux.org/
19 #include <linux/gpio.h>
20 #include <linux/irq.h>
21 #include <linux/jiffies.h>
22 #include <linux/timer.h>
23 #include <linux/serial.h>
24 #include <linux/serial_8250.h>
25 #include <linux/leds.h>
26 #include <linux/reboot.h>
27 #include <linux/i2c.h>
28 #include <linux/i2c-gpio.h>
29 #include <linux/gpio.h>
31 #include <mach/hardware.h>
33 #include <asm/mach-types.h>
34 #include <asm/mach/arch.h>
35 #include <asm/mach/flash.h>
36 #include <asm/mach/time.h>
38 #define DSMG600_SDA_PIN 5
39 #define DSMG600_SCL_PIN 4
41 /* DSM-G600 Timer Setting */
42 #define DSMG600_FREQ 66000000
45 #define DSMG600_PB_GPIO 15 /* power button */
46 #define DSMG600_RB_GPIO 3 /* reset button */
49 #define DSMG600_PO_GPIO 2 /* power off */
52 #define DSMG600_LED_PWR_GPIO 0
53 #define DSMG600_LED_WLAN_GPIO 14
55 static struct flash_platform_data dsmg600_flash_data = {
56 .map_name = "cfi_probe",
60 static struct resource dsmg600_flash_resource = {
61 .flags = IORESOURCE_MEM,
64 static struct platform_device dsmg600_flash = {
65 .name = "IXP4XX-Flash",
67 .dev.platform_data = &dsmg600_flash_data,
69 .resource = &dsmg600_flash_resource,
72 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
73 .sda_pin = DSMG600_SDA_PIN,
74 .scl_pin = DSMG600_SCL_PIN,
77 static struct platform_device dsmg600_i2c_gpio = {
81 .platform_data = &dsmg600_i2c_gpio_data,
85 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
87 I2C_BOARD_INFO("pcf8563", 0x51),
91 static struct gpio_led dsmg600_led_pins[] = {
93 .name = "dsmg600:green:power",
94 .gpio = DSMG600_LED_PWR_GPIO,
97 .name = "dsmg600:green:wlan",
98 .gpio = DSMG600_LED_WLAN_GPIO,
103 static struct gpio_led_platform_data dsmg600_led_data = {
104 .num_leds = ARRAY_SIZE(dsmg600_led_pins),
105 .leds = dsmg600_led_pins,
108 static struct platform_device dsmg600_leds = {
111 .dev.platform_data = &dsmg600_led_data,
114 static struct resource dsmg600_uart_resources[] = {
116 .start = IXP4XX_UART1_BASE_PHYS,
117 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
118 .flags = IORESOURCE_MEM,
121 .start = IXP4XX_UART2_BASE_PHYS,
122 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
123 .flags = IORESOURCE_MEM,
127 static struct plat_serial8250_port dsmg600_uart_data[] = {
129 .mapbase = IXP4XX_UART1_BASE_PHYS,
130 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
131 .irq = IRQ_IXP4XX_UART1,
132 .flags = UPF_BOOT_AUTOCONF,
135 .uartclk = IXP4XX_UART_XTAL,
138 .mapbase = IXP4XX_UART2_BASE_PHYS,
139 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
140 .irq = IRQ_IXP4XX_UART2,
141 .flags = UPF_BOOT_AUTOCONF,
144 .uartclk = IXP4XX_UART_XTAL,
149 static struct platform_device dsmg600_uart = {
150 .name = "serial8250",
151 .id = PLAT8250_DEV_PLATFORM,
152 .dev.platform_data = dsmg600_uart_data,
153 .num_resources = ARRAY_SIZE(dsmg600_uart_resources),
154 .resource = dsmg600_uart_resources,
157 static struct platform_device *dsmg600_devices[] __initdata = {
163 static void dsmg600_power_off(void)
165 /* enable the pwr cntl and drive it high */
166 gpio_direction_output(DSMG600_PO_GPIO, 1);
169 /* This is used to make sure the power-button pusher is serious. The button
170 * must be held until the value of this counter reaches zero.
172 static int power_button_countdown;
174 /* Must hold the button down for at least this many counts to be processed */
175 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
177 static void dsmg600_power_handler(unsigned long data);
178 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
180 static void dsmg600_power_handler(unsigned long data)
182 /* This routine is called twice per second to check the
183 * state of the power button.
186 if (gpio_get_value(DSMG600_PB_GPIO)) {
188 /* IO Pin is 1 (button pushed) */
189 if (power_button_countdown > 0)
190 power_button_countdown--;
194 /* Done on button release, to allow for auto-power-on mods. */
195 if (power_button_countdown == 0) {
196 /* Signal init to do the ctrlaltdel action,
197 * this will bypass init if it hasn't started
198 * and do a kernel_restart.
202 /* Change the state of the power LED to "blink" */
203 gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
205 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
209 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
212 static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
214 /* This is the paper-clip reset, it shuts the machine down directly. */
220 static void __init dsmg600_timer_init(void)
222 /* The xtal on this machine is non-standard. */
223 ixp4xx_timer_freq = DSMG600_FREQ;
225 /* Call standard timer_init function. */
229 static int __init dsmg600_gpio_init(void)
231 if (!machine_is_dsmg600())
234 gpio_request(DSMG600_RB_GPIO, "reset button");
235 if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
236 IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
238 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
239 gpio_to_irq(DSMG600_RB_GPIO));
243 * The power button on the D-Link DSM-G600 is on GPIO 15, but
244 * it cannot handle interrupts on that GPIO line. So we'll
245 * have to poll it with a kernel timer.
248 /* Make sure that the power button GPIO is set up as an input */
249 gpio_request(DSMG600_PB_GPIO, "power button");
250 gpio_direction_input(DSMG600_PB_GPIO);
251 /* Request poweroff GPIO line */
252 gpio_request(DSMG600_PO_GPIO, "power off button");
254 /* Set the initial value for the power button IRQ handler */
255 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
257 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
260 device_initcall(dsmg600_gpio_init);
262 static void __init dsmg600_init(void)
266 /* Make sure that GPIO14 and GPIO15 are not used as clocks */
267 *IXP4XX_GPIO_GPCLKR = 0;
269 dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
270 dsmg600_flash_resource.end =
271 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
273 i2c_register_board_info(0, dsmg600_i2c_board_info,
274 ARRAY_SIZE(dsmg600_i2c_board_info));
276 /* The UART is required on the DSM-G600 (Redboot cannot use the
277 * NIC) -- do it here so that it does *not* get removed if
278 * platform_add_devices fails!
280 (void)platform_device_register(&dsmg600_uart);
282 platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
284 pm_power_off = dsmg600_power_off;
287 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
288 /* Maintainer: www.nslu2-linux.org */
289 .atag_offset = 0x100,
290 .map_io = ixp4xx_map_io,
291 .init_early = ixp4xx_init_early,
292 .init_irq = ixp4xx_init_irq,
293 .init_time = dsmg600_timer_init,
294 .init_machine = dsmg600_init,
295 #if defined(CONFIG_PCI)
296 .dma_zone_size = SZ_64M,
298 .restart = ixp4xx_restart,