1/*
2 * arch/arm/mach-ixp4xx/nslu2-setup.c
3 *
4 * NSLU2 board-setup
5 *
6 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
7 *
8 * based on ixdp425-setup.c:
9 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
10 * based on nslu2-power.c:
11 *	Copyright (C) 2005 Tower Technologies
12 *
13 * Author: Mark Rakes <mrakes at mac.com>
14 * Author: Rod Whitby <rod@whitby.id.au>
15 * Author: Alessandro Zummo <a.zummo@towertech.it>
16 * Maintainers: http://www.nslu2-linux.org/
17 *
18 */
19#include <linux/gpio.h>
20#include <linux/if_ether.h>
21#include <linux/irq.h>
22#include <linux/serial.h>
23#include <linux/serial_8250.h>
24#include <linux/leds.h>
25#include <linux/reboot.h>
26#include <linux/i2c.h>
27#include <linux/i2c-gpio.h>
28#include <linux/io.h>
29#include <asm/mach-types.h>
30#include <asm/mach/arch.h>
31#include <asm/mach/flash.h>
32#include <asm/mach/time.h>
33
34#define NSLU2_SDA_PIN		7
35#define NSLU2_SCL_PIN		6
36
37/* NSLU2 Timer */
38#define NSLU2_FREQ 66000000
39
40/* Buttons */
41#define NSLU2_PB_GPIO		5	/* power button */
42#define NSLU2_PO_GPIO		8	/* power off */
43#define NSLU2_RB_GPIO		12	/* reset button */
44
45/* Buzzer */
46#define NSLU2_GPIO_BUZZ		4
47
48/* LEDs */
49#define NSLU2_LED_RED_GPIO	0
50#define NSLU2_LED_GRN_GPIO	1
51#define NSLU2_LED_DISK1_GPIO	3
52#define NSLU2_LED_DISK2_GPIO	2
53
54static struct flash_platform_data nslu2_flash_data = {
55	.map_name		= "cfi_probe",
56	.width			= 2,
57};
58
59static struct resource nslu2_flash_resource = {
60	.flags			= IORESOURCE_MEM,
61};
62
63static struct platform_device nslu2_flash = {
64	.name			= "IXP4XX-Flash",
65	.id			= 0,
66	.dev.platform_data	= &nslu2_flash_data,
67	.num_resources		= 1,
68	.resource		= &nslu2_flash_resource,
69};
70
71static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
72	.sda_pin		= NSLU2_SDA_PIN,
73	.scl_pin		= NSLU2_SCL_PIN,
74};
75
76static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
77	{
78		I2C_BOARD_INFO("x1205", 0x6f),
79	},
80};
81
82static struct gpio_led nslu2_led_pins[] = {
83	{
84		.name		= "nslu2:green:ready",
85		.gpio		= NSLU2_LED_GRN_GPIO,
86	},
87	{
88		.name		= "nslu2:red:status",
89		.gpio		= NSLU2_LED_RED_GPIO,
90	},
91	{
92		.name		= "nslu2:green:disk-1",
93		.gpio		= NSLU2_LED_DISK1_GPIO,
94		.active_low	= true,
95	},
96	{
97		.name		= "nslu2:green:disk-2",
98		.gpio		= NSLU2_LED_DISK2_GPIO,
99		.active_low	= true,
100	},
101};
102
103static struct gpio_led_platform_data nslu2_led_data = {
104	.num_leds		= ARRAY_SIZE(nslu2_led_pins),
105	.leds			= nslu2_led_pins,
106};
107
108static struct platform_device nslu2_leds = {
109	.name			= "leds-gpio",
110	.id			= -1,
111	.dev.platform_data	= &nslu2_led_data,
112};
113
114static struct platform_device nslu2_i2c_gpio = {
115	.name			= "i2c-gpio",
116	.id			= 0,
117	.dev	 = {
118		.platform_data	= &nslu2_i2c_gpio_data,
119	},
120};
121
122static struct platform_device nslu2_beeper = {
123	.name			= "ixp4xx-beeper",
124	.id			= NSLU2_GPIO_BUZZ,
125	.num_resources		= 0,
126};
127
128static struct resource nslu2_uart_resources[] = {
129	{
130		.start		= IXP4XX_UART1_BASE_PHYS,
131		.end		= IXP4XX_UART1_BASE_PHYS + 0x0fff,
132		.flags		= IORESOURCE_MEM,
133	},
134	{
135		.start		= IXP4XX_UART2_BASE_PHYS,
136		.end		= IXP4XX_UART2_BASE_PHYS + 0x0fff,
137		.flags		= IORESOURCE_MEM,
138	}
139};
140
141static struct plat_serial8250_port nslu2_uart_data[] = {
142	{
143		.mapbase	= IXP4XX_UART1_BASE_PHYS,
144		.membase	= (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
145		.irq		= IRQ_IXP4XX_UART1,
146		.flags		= UPF_BOOT_AUTOCONF,
147		.iotype		= UPIO_MEM,
148		.regshift	= 2,
149		.uartclk	= IXP4XX_UART_XTAL,
150	},
151	{
152		.mapbase	= IXP4XX_UART2_BASE_PHYS,
153		.membase	= (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
154		.irq		= IRQ_IXP4XX_UART2,
155		.flags		= UPF_BOOT_AUTOCONF,
156		.iotype		= UPIO_MEM,
157		.regshift	= 2,
158		.uartclk	= IXP4XX_UART_XTAL,
159	},
160	{ }
161};
162
163static struct platform_device nslu2_uart = {
164	.name			= "serial8250",
165	.id			= PLAT8250_DEV_PLATFORM,
166	.dev.platform_data	= nslu2_uart_data,
167	.num_resources		= 2,
168	.resource		= nslu2_uart_resources,
169};
170
171/* Built-in 10/100 Ethernet MAC interfaces */
172static struct eth_plat_info nslu2_plat_eth[] = {
173	{
174		.phy		= 1,
175		.rxq		= 3,
176		.txreadyq	= 20,
177	}
178};
179
180static struct platform_device nslu2_eth[] = {
181	{
182		.name			= "ixp4xx_eth",
183		.id			= IXP4XX_ETH_NPEB,
184		.dev.platform_data	= nslu2_plat_eth,
185	}
186};
187
188static struct platform_device *nslu2_devices[] __initdata = {
189	&nslu2_i2c_gpio,
190	&nslu2_flash,
191	&nslu2_beeper,
192	&nslu2_leds,
193	&nslu2_eth[0],
194};
195
196static void nslu2_power_off(void)
197{
198	/* This causes the box to drop the power and go dead. */
199
200	/* enable the pwr cntl gpio and assert power off */
201	gpio_direction_output(NSLU2_PO_GPIO, 1);
202}
203
204static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
205{
206	/* Signal init to do the ctrlaltdel action, this will bypass init if
207	 * it hasn't started and do a kernel_restart.
208	 */
209	ctrl_alt_del();
210
211	return IRQ_HANDLED;
212}
213
214static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
215{
216	/* This is the paper-clip reset, it shuts the machine down directly.
217	 */
218	machine_power_off();
219
220	return IRQ_HANDLED;
221}
222
223static int __init nslu2_gpio_init(void)
224{
225	if (!machine_is_nslu2())
226		return 0;
227
228	/* Request the power off GPIO */
229	return gpio_request(NSLU2_PO_GPIO, "power off");
230}
231device_initcall(nslu2_gpio_init);
232
233static void __init nslu2_timer_init(void)
234{
235    /* The xtal on this machine is non-standard. */
236    ixp4xx_timer_freq = NSLU2_FREQ;
237
238    /* Call standard timer_init function. */
239    ixp4xx_timer_init();
240}
241
242static void __init nslu2_init(void)
243{
244	uint8_t __iomem *f;
245	int i;
246
247	ixp4xx_sys_init();
248
249	nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
250	nslu2_flash_resource.end =
251		IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
252
253	i2c_register_board_info(0, nslu2_i2c_board_info,
254				ARRAY_SIZE(nslu2_i2c_board_info));
255
256	/*
257	 * This is only useful on a modified machine, but it is valuable
258	 * to have it first in order to see debug messages, and so that
259	 * it does *not* get removed if platform_add_devices fails!
260	 */
261	(void)platform_device_register(&nslu2_uart);
262
263	platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
264
265	pm_power_off = nslu2_power_off;
266
267	if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
268		IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
269
270		printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
271			gpio_to_irq(NSLU2_RB_GPIO));
272	}
273
274	if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
275		IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
276
277		printk(KERN_DEBUG "Power Button IRQ %d not available\n",
278			gpio_to_irq(NSLU2_PB_GPIO));
279	}
280
281	/*
282	 * Map in a portion of the flash and read the MAC address.
283	 * Since it is stored in BE in the flash itself, we need to
284	 * byteswap it if we're in LE mode.
285	 */
286	f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
287	if (f) {
288		for (i = 0; i < 6; i++)
289#ifdef __ARMEB__
290			nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
291#else
292			nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
293#endif
294		iounmap(f);
295	}
296	printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
297	       nslu2_plat_eth[0].hwaddr);
298
299}
300
301MACHINE_START(NSLU2, "Linksys NSLU2")
302	/* Maintainer: www.nslu2-linux.org */
303	.atag_offset	= 0x100,
304	.map_io		= ixp4xx_map_io,
305	.init_early	= ixp4xx_init_early,
306	.init_irq	= ixp4xx_init_irq,
307	.init_time	= nslu2_timer_init,
308	.init_machine	= nslu2_init,
309#if defined(CONFIG_PCI)
310	.dma_zone_size	= SZ_64M,
311#endif
312	.restart	= ixp4xx_restart,
313MACHINE_END
314