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nas100d-setup.c
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1 /*
2  * arch/arm/mach-ixp4xx/nas100d-setup.c
3  *
4  * NAS 100d board-setup
5  *
6  * Copyright (C) 2008 Rod Whitby <[email protected]>
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 <[email protected]>
16  * Author: Rod Whitby <[email protected]>
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 
51 static struct flash_platform_data nas100d_flash_data = {
52  .map_name = "cfi_probe",
53  .width = 2,
54 };
55 
56 static struct resource nas100d_flash_resource = {
57  .flags = IORESOURCE_MEM,
58 };
59 
60 static 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 
68 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
69  {
70  I2C_BOARD_INFO("pcf8563", 0x51),
71  },
72 };
73 
74 static 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 
92 static struct gpio_led_platform_data nas100d_led_data = {
93  .num_leds = ARRAY_SIZE(nas100d_led_pins),
94  .leds = nas100d_led_pins,
95 };
96 
97 static struct platform_device nas100d_leds = {
98  .name = "leds-gpio",
99  .id = -1,
100  .dev.platform_data = &nas100d_led_data,
101 };
102 
103 static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
104  .sda_pin = NAS100D_SDA_PIN,
105  .scl_pin = NAS100D_SCL_PIN,
106 };
107 
108 static 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 
116 static 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 
129 static struct plat_serial8250_port nas100d_uart_data[] = {
130  {
131  .mapbase = IXP4XX_UART1_BASE_PHYS,
132  .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
135  .iotype = UPIO_MEM,
136  .regshift = 2,
138  },
139  {
140  .mapbase = IXP4XX_UART2_BASE_PHYS,
141  .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
144  .iotype = UPIO_MEM,
145  .regshift = 2,
147  },
148  { }
149 };
150 
151 static 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 */
160 static struct eth_plat_info nas100d_plat_eth[] = {
161  {
162  .phy = 0,
163  .rxq = 3,
164  .txreadyq = 20,
165  }
166 };
167 
168 static 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 
176 static struct platform_device *nas100d_devices[] __initdata = {
177  &nas100d_i2c_gpio,
178  &nas100d_flash,
179  &nas100d_leds,
180  &nas100d_eth[0],
181 };
182 
183 static 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 */
189 
190  /* do the deed */
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  */
197 static 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 
202 static void nas100d_power_handler(unsigned long data);
203 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
204 
205 static 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 
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" */
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 
237 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
238 {
239  /* This is the paper-clip reset, it shuts the machine down directly. */
241 
242  return IRQ_HANDLED;
243 }
244 
245 static 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 =
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,
275  "NAS100D reset button", NULL) < 0) {
276 
277  printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
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 */
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 
314 MACHINE_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,