1/*
2 * DSM-G600 board-setup
3 *
4 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
5 * Copyright (C) 2006 Tower Technologies
6 *
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
13 *
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/
18 */
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>
30
31#include <mach/hardware.h>
32
33#include <asm/mach-types.h>
34#include <asm/mach/arch.h>
35#include <asm/mach/flash.h>
36#include <asm/mach/time.h>
37
38#define DSMG600_SDA_PIN		5
39#define DSMG600_SCL_PIN		4
40
41/* DSM-G600 Timer Setting */
42#define DSMG600_FREQ		66000000
43
44/* Buttons */
45#define DSMG600_PB_GPIO		15	/* power button */
46#define DSMG600_RB_GPIO		3	/* reset button */
47
48/* Power control */
49#define DSMG600_PO_GPIO		2	/* power off */
50
51/* LEDs */
52#define DSMG600_LED_PWR_GPIO	0
53#define DSMG600_LED_WLAN_GPIO	14
54
55static struct flash_platform_data dsmg600_flash_data = {
56	.map_name		= "cfi_probe",
57	.width			= 2,
58};
59
60static struct resource dsmg600_flash_resource = {
61	.flags			= IORESOURCE_MEM,
62};
63
64static struct platform_device dsmg600_flash = {
65	.name			= "IXP4XX-Flash",
66	.id			= 0,
67	.dev.platform_data	= &dsmg600_flash_data,
68	.num_resources		= 1,
69	.resource		= &dsmg600_flash_resource,
70};
71
72static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
73	.sda_pin		= DSMG600_SDA_PIN,
74	.scl_pin		= DSMG600_SCL_PIN,
75};
76
77static struct platform_device dsmg600_i2c_gpio = {
78	.name			= "i2c-gpio",
79	.id			= 0,
80	.dev	 = {
81		.platform_data	= &dsmg600_i2c_gpio_data,
82	},
83};
84
85static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
86	{
87		I2C_BOARD_INFO("pcf8563", 0x51),
88	},
89};
90
91static struct gpio_led dsmg600_led_pins[] = {
92	{
93		.name		= "dsmg600:green:power",
94		.gpio		= DSMG600_LED_PWR_GPIO,
95	},
96	{
97		.name		= "dsmg600:green:wlan",
98		.gpio		= DSMG600_LED_WLAN_GPIO,
99		.active_low	= true,
100	},
101};
102
103static struct gpio_led_platform_data dsmg600_led_data = {
104	.num_leds		= ARRAY_SIZE(dsmg600_led_pins),
105	.leds			= dsmg600_led_pins,
106};
107
108static struct platform_device dsmg600_leds = {
109	.name			= "leds-gpio",
110	.id			= -1,
111	.dev.platform_data	= &dsmg600_led_data,
112};
113
114static struct resource dsmg600_uart_resources[] = {
115	{
116		.start		= IXP4XX_UART1_BASE_PHYS,
117		.end		= IXP4XX_UART1_BASE_PHYS + 0x0fff,
118		.flags		= IORESOURCE_MEM,
119	},
120	{
121		.start		= IXP4XX_UART2_BASE_PHYS,
122		.end		= IXP4XX_UART2_BASE_PHYS + 0x0fff,
123		.flags		= IORESOURCE_MEM,
124	}
125};
126
127static struct plat_serial8250_port dsmg600_uart_data[] = {
128	{
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,
133		.iotype		= UPIO_MEM,
134		.regshift	= 2,
135		.uartclk	= IXP4XX_UART_XTAL,
136	},
137	{
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,
142		.iotype		= UPIO_MEM,
143		.regshift	= 2,
144		.uartclk	= IXP4XX_UART_XTAL,
145	},
146	{ }
147};
148
149static 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,
155};
156
157static struct platform_device *dsmg600_devices[] __initdata = {
158	&dsmg600_i2c_gpio,
159	&dsmg600_flash,
160	&dsmg600_leds,
161};
162
163static void dsmg600_power_off(void)
164{
165	/* enable the pwr cntl and drive it high */
166	gpio_direction_output(DSMG600_PO_GPIO, 1);
167}
168
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.
171 */
172static int power_button_countdown;
173
174/* Must hold the button down for at least this many counts to be processed */
175#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
176
177static void dsmg600_power_handler(unsigned long data);
178static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
179
180static void dsmg600_power_handler(unsigned long data)
181{
182	/* This routine is called twice per second to check the
183	 * state of the power button.
184	 */
185
186	if (gpio_get_value(DSMG600_PB_GPIO)) {
187
188		/* IO Pin is 1 (button pushed) */
189		if (power_button_countdown > 0)
190			power_button_countdown--;
191
192	} else {
193
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.
199			 */
200			ctrl_alt_del();
201
202			/* Change the state of the power LED to "blink" */
203			gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
204		} else {
205			power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
206		}
207	}
208
209	mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
210}
211
212static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
213{
214	/* This is the paper-clip reset, it shuts the machine down directly. */
215	machine_power_off();
216
217	return IRQ_HANDLED;
218}
219
220static void __init dsmg600_timer_init(void)
221{
222    /* The xtal on this machine is non-standard. */
223    ixp4xx_timer_freq = DSMG600_FREQ;
224
225    /* Call standard timer_init function. */
226    ixp4xx_timer_init();
227}
228
229static int __init dsmg600_gpio_init(void)
230{
231	if (!machine_is_dsmg600())
232		return 0;
233
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) {
237
238		printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
239			gpio_to_irq(DSMG600_RB_GPIO));
240	}
241
242	/*
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.
246	 */
247
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");
253
254	/* Set the initial value for the power button IRQ handler */
255	power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
256
257	mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
258	return 0;
259}
260device_initcall(dsmg600_gpio_init);
261
262static void __init dsmg600_init(void)
263{
264	ixp4xx_sys_init();
265
266	/* Make sure that GPIO14 and GPIO15 are not used as clocks */
267	*IXP4XX_GPIO_GPCLKR = 0;
268
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;
272
273	i2c_register_board_info(0, dsmg600_i2c_board_info,
274				ARRAY_SIZE(dsmg600_i2c_board_info));
275
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!
279         */
280        (void)platform_device_register(&dsmg600_uart);
281
282	platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
283
284	pm_power_off = dsmg600_power_off;
285}
286
287MACHINE_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,
297#endif
298	.restart	= ixp4xx_restart,
299MACHINE_END
300