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/arch/arm/mach-ixp4xx/nas100d-setup.c

https://github.com/AICP/kernel_google_msm
C | 326 lines | 216 code | 51 blank | 59 comment | 9 complexity | 32917b5004f483e1265c00c97e918930 MD5 | raw file
  1/*
  2 * arch/arm/mach-ixp4xx/nas100d-setup.c
  3 *
  4 * NAS 100d 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 nas100d-power.c:
 11 *	Copyright (C) 2005 Tower Technologies
 12 * based on nas100d-io.c
 13 *	Copyright (C) 2004 Karen Spearel
 14 *
 15 * Author: Alessandro Zummo <a.zummo@towertech.it>
 16 * Author: Rod Whitby <rod@whitby.id.au>
 17 * Maintainers: http://www.nslu2-linux.org/
 18 *
 19 */
 20#include <linux/gpio.h>
 21#include <linux/if_ether.h>
 22#include <linux/irq.h>
 23#include <linux/jiffies.h>
 24#include <linux/timer.h>
 25#include <linux/serial.h>
 26#include <linux/serial_8250.h>
 27#include <linux/leds.h>
 28#include <linux/reboot.h>
 29#include <linux/i2c.h>
 30#include <linux/i2c-gpio.h>
 31#include <linux/io.h>
 32#include <asm/mach-types.h>
 33#include <asm/mach/arch.h>
 34#include <asm/mach/flash.h>
 35
 36#define NAS100D_SDA_PIN		5
 37#define NAS100D_SCL_PIN		6
 38
 39/* Buttons */
 40#define NAS100D_PB_GPIO         14   /* power button */
 41#define NAS100D_RB_GPIO         4    /* reset button */
 42
 43/* Power control */
 44#define NAS100D_PO_GPIO         12   /* power off */
 45
 46/* LEDs */
 47#define NAS100D_LED_WLAN_GPIO	0
 48#define NAS100D_LED_DISK_GPIO	3
 49#define NAS100D_LED_PWR_GPIO	15
 50
 51static struct flash_platform_data nas100d_flash_data = {
 52	.map_name		= "cfi_probe",
 53	.width			= 2,
 54};
 55
 56static struct resource nas100d_flash_resource = {
 57	.flags			= IORESOURCE_MEM,
 58};
 59
 60static struct platform_device nas100d_flash = {
 61	.name			= "IXP4XX-Flash",
 62	.id			= 0,
 63	.dev.platform_data	= &nas100d_flash_data,
 64	.num_resources		= 1,
 65	.resource		= &nas100d_flash_resource,
 66};
 67
 68static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
 69	{
 70		I2C_BOARD_INFO("pcf8563", 0x51),
 71	},
 72};
 73
 74static struct gpio_led nas100d_led_pins[] = {
 75	{
 76		.name		= "nas100d:green:wlan",
 77		.gpio		= NAS100D_LED_WLAN_GPIO,
 78		.active_low	= true,
 79	},
 80	{
 81		.name		= "nas100d:blue:power",  /* (off=flashing) */
 82		.gpio		= NAS100D_LED_PWR_GPIO,
 83		.active_low	= true,
 84	},
 85	{
 86		.name		= "nas100d:yellow:disk",
 87		.gpio		= NAS100D_LED_DISK_GPIO,
 88		.active_low	= true,
 89	},
 90};
 91
 92static struct gpio_led_platform_data nas100d_led_data = {
 93	.num_leds		= ARRAY_SIZE(nas100d_led_pins),
 94	.leds			= nas100d_led_pins,
 95};
 96
 97static struct platform_device nas100d_leds = {
 98	.name			= "leds-gpio",
 99	.id			= -1,
100	.dev.platform_data	= &nas100d_led_data,
101};
102
103static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
104	.sda_pin		= NAS100D_SDA_PIN,
105	.scl_pin		= NAS100D_SCL_PIN,
106};
107
108static struct platform_device nas100d_i2c_gpio = {
109	.name			= "i2c-gpio",
110	.id			= 0,
111	.dev	 = {
112		.platform_data	= &nas100d_i2c_gpio_data,
113	},
114};
115
116static struct resource nas100d_uart_resources[] = {
117	{
118		.start		= IXP4XX_UART1_BASE_PHYS,
119		.end		= IXP4XX_UART1_BASE_PHYS + 0x0fff,
120		.flags		= IORESOURCE_MEM,
121	},
122	{
123		.start		= IXP4XX_UART2_BASE_PHYS,
124		.end		= IXP4XX_UART2_BASE_PHYS + 0x0fff,
125		.flags		= IORESOURCE_MEM,
126	}
127};
128
129static struct plat_serial8250_port nas100d_uart_data[] = {
130	{
131		.mapbase	= IXP4XX_UART1_BASE_PHYS,
132		.membase	= (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
133		.irq		= IRQ_IXP4XX_UART1,
134		.flags		= UPF_BOOT_AUTOCONF,
135		.iotype		= UPIO_MEM,
136		.regshift	= 2,
137		.uartclk	= IXP4XX_UART_XTAL,
138	},
139	{
140		.mapbase	= IXP4XX_UART2_BASE_PHYS,
141		.membase	= (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
142		.irq		= IRQ_IXP4XX_UART2,
143		.flags		= UPF_BOOT_AUTOCONF,
144		.iotype		= UPIO_MEM,
145		.regshift	= 2,
146		.uartclk	= IXP4XX_UART_XTAL,
147	},
148	{ }
149};
150
151static struct platform_device nas100d_uart = {
152	.name			= "serial8250",
153	.id			= PLAT8250_DEV_PLATFORM,
154	.dev.platform_data	= nas100d_uart_data,
155	.num_resources		= 2,
156	.resource		= nas100d_uart_resources,
157};
158
159/* Built-in 10/100 Ethernet MAC interfaces */
160static struct eth_plat_info nas100d_plat_eth[] = {
161	{
162		.phy		= 0,
163		.rxq		= 3,
164		.txreadyq	= 20,
165	}
166};
167
168static struct platform_device nas100d_eth[] = {
169	{
170		.name			= "ixp4xx_eth",
171		.id			= IXP4XX_ETH_NPEB,
172		.dev.platform_data	= nas100d_plat_eth,
173	}
174};
175
176static struct platform_device *nas100d_devices[] __initdata = {
177	&nas100d_i2c_gpio,
178	&nas100d_flash,
179	&nas100d_leds,
180	&nas100d_eth[0],
181};
182
183static void nas100d_power_off(void)
184{
185	/* This causes the box to drop the power and go dead. */
186
187	/* enable the pwr cntl gpio */
188	gpio_line_config(NAS100D_PO_GPIO, IXP4XX_GPIO_OUT);
189
190	/* do the deed */
191	gpio_line_set(NAS100D_PO_GPIO, IXP4XX_GPIO_HIGH);
192}
193
194/* This is used to make sure the power-button pusher is serious.  The button
195 * must be held until the value of this counter reaches zero.
196 */
197static int power_button_countdown;
198
199/* Must hold the button down for at least this many counts to be processed */
200#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
201
202static void nas100d_power_handler(unsigned long data);
203static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
204
205static void nas100d_power_handler(unsigned long data)
206{
207	/* This routine is called twice per second to check the
208	 * state of the power button.
209	 */
210
211	if (gpio_get_value(NAS100D_PB_GPIO)) {
212
213		/* IO Pin is 1 (button pushed) */
214		if (power_button_countdown > 0)
215			power_button_countdown--;
216
217	} else {
218
219		/* Done on button release, to allow for auto-power-on mods. */
220		if (power_button_countdown == 0) {
221			/* Signal init to do the ctrlaltdel action,
222			 * this will bypass init if it hasn't started
223			 * and do a kernel_restart.
224			 */
225			ctrl_alt_del();
226
227			/* Change the state of the power LED to "blink" */
228			gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
229		} else {
230			power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
231		}
232	}
233
234	mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
235}
236
237static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
238{
239	/* This is the paper-clip reset, it shuts the machine down directly. */
240	machine_power_off();
241
242	return IRQ_HANDLED;
243}
244
245static void __init nas100d_init(void)
246{
247	uint8_t __iomem *f;
248	int i;
249
250	ixp4xx_sys_init();
251
252	/* gpio 14 and 15 are _not_ clocks */
253	*IXP4XX_GPIO_GPCLKR = 0;
254
255	nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
256	nas100d_flash_resource.end =
257		IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
258
259	i2c_register_board_info(0, nas100d_i2c_board_info,
260				ARRAY_SIZE(nas100d_i2c_board_info));
261
262	/*
263	 * This is only useful on a modified machine, but it is valuable
264	 * to have it first in order to see debug messages, and so that
265	 * it does *not* get removed if platform_add_devices fails!
266	 */
267	(void)platform_device_register(&nas100d_uart);
268
269	platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
270
271	pm_power_off = nas100d_power_off;
272
273	if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
274		IRQF_DISABLED | IRQF_TRIGGER_LOW,
275		"NAS100D reset button", NULL) < 0) {
276
277		printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
278			gpio_to_irq(NAS100D_RB_GPIO));
279	}
280
281	/* The power button on the Iomega NAS100d is on GPIO 14, but
282	 * it cannot handle interrupts on that GPIO line.  So we'll
283	 * have to poll it with a kernel timer.
284	 */
285
286	/* Make sure that the power button GPIO is set up as an input */
287	gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
288
289	/* Set the initial value for the power button IRQ handler */
290	power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
291
292	mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
293
294	/*
295	 * Map in a portion of the flash and read the MAC address.
296	 * Since it is stored in BE in the flash itself, we need to
297	 * byteswap it if we're in LE mode.
298	 */
299	f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
300	if (f) {
301		for (i = 0; i < 6; i++)
302#ifdef __ARMEB__
303			nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
304#else
305			nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
306#endif
307		iounmap(f);
308	}
309	printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
310	       nas100d_plat_eth[0].hwaddr);
311
312}
313
314MACHINE_START(NAS100D, "Iomega NAS 100d")
315	/* Maintainer: www.nslu2-linux.org */
316	.atag_offset	= 0x100,
317	.map_io		= ixp4xx_map_io,
318	.init_early	= ixp4xx_init_early,
319	.init_irq	= ixp4xx_init_irq,
320	.timer          = &ixp4xx_timer,
321	.init_machine	= nas100d_init,
322#if defined(CONFIG_PCI)
323	.dma_zone_size	= SZ_64M,
324#endif
325	.restart	= ixp4xx_restart,
326MACHINE_END