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
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,
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
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
nas100d_power_off(void)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 and assert power off */
188 gpio_direction_output(NAS100D_PO_GPIO, 1);
189 }
190
191 /* This is used to make sure the power-button pusher is serious. The button
192 * must be held until the value of this counter reaches zero.
193 */
194 static int power_button_countdown;
195
196 /* Must hold the button down for at least this many counts to be processed */
197 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
198
199 static void nas100d_power_handler(unsigned long data);
200 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
201
nas100d_power_handler(unsigned long data)202 static void nas100d_power_handler(unsigned long data)
203 {
204 /* This routine is called twice per second to check the
205 * state of the power button.
206 */
207
208 if (gpio_get_value(NAS100D_PB_GPIO)) {
209
210 /* IO Pin is 1 (button pushed) */
211 if (power_button_countdown > 0)
212 power_button_countdown--;
213
214 } else {
215
216 /* Done on button release, to allow for auto-power-on mods. */
217 if (power_button_countdown == 0) {
218 /* Signal init to do the ctrlaltdel action,
219 * this will bypass init if it hasn't started
220 * and do a kernel_restart.
221 */
222 ctrl_alt_del();
223
224 /* Change the state of the power LED to "blink" */
225 gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
226 } else {
227 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
228 }
229 }
230
231 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
232 }
233
nas100d_reset_handler(int irq,void * dev_id)234 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
235 {
236 /* This is the paper-clip reset, it shuts the machine down directly. */
237 machine_power_off();
238
239 return IRQ_HANDLED;
240 }
241
nas100d_gpio_init(void)242 static int __init nas100d_gpio_init(void)
243 {
244 if (!machine_is_nas100d())
245 return 0;
246
247 /*
248 * The power button on the Iomega NAS100d is on GPIO 14, but
249 * it cannot handle interrupts on that GPIO line. So we'll
250 * have to poll it with a kernel timer.
251 */
252
253 /* Request the power off GPIO */
254 gpio_request(NAS100D_PO_GPIO, "power off");
255
256 /* Make sure that the power button GPIO is set up as an input */
257 gpio_request(NAS100D_PB_GPIO, "power button");
258 gpio_direction_input(NAS100D_PB_GPIO);
259
260 /* Set the initial value for the power button IRQ handler */
261 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
262
263 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
264
265 return 0;
266 }
267 device_initcall(nas100d_gpio_init);
268
nas100d_init(void)269 static void __init nas100d_init(void)
270 {
271 uint8_t __iomem *f;
272 int i;
273
274 ixp4xx_sys_init();
275
276 /* gpio 14 and 15 are _not_ clocks */
277 *IXP4XX_GPIO_GPCLKR = 0;
278
279 nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
280 nas100d_flash_resource.end =
281 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
282
283 i2c_register_board_info(0, nas100d_i2c_board_info,
284 ARRAY_SIZE(nas100d_i2c_board_info));
285
286 /*
287 * This is only useful on a modified machine, but it is valuable
288 * to have it first in order to see debug messages, and so that
289 * it does *not* get removed if platform_add_devices fails!
290 */
291 (void)platform_device_register(&nas100d_uart);
292
293 platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
294
295 pm_power_off = nas100d_power_off;
296
297 if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
298 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
299
300 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
301 gpio_to_irq(NAS100D_RB_GPIO));
302 }
303
304 /*
305 * Map in a portion of the flash and read the MAC address.
306 * Since it is stored in BE in the flash itself, we need to
307 * byteswap it if we're in LE mode.
308 */
309 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
310 if (f) {
311 for (i = 0; i < 6; i++)
312 #ifdef __ARMEB__
313 nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
314 #else
315 nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
316 #endif
317 iounmap(f);
318 }
319 printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
320 nas100d_plat_eth[0].hwaddr);
321
322 }
323
324 MACHINE_START(NAS100D, "Iomega NAS 100d")
325 /* Maintainer: www.nslu2-linux.org */
326 .atag_offset = 0x100,
327 .map_io = ixp4xx_map_io,
328 .init_early = ixp4xx_init_early,
329 .init_irq = ixp4xx_init_irq,
330 .init_time = ixp4xx_timer_init,
331 .init_machine = nas100d_init,
332 #if defined(CONFIG_PCI)
333 .dma_zone_size = SZ_64M,
334 #endif
335 .restart = ixp4xx_restart,
336 MACHINE_END
337