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Linux/arch/arm/mach-ixp4xx/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 <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 
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 */
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  */
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 
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 
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. */
240         machine_power_off();
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 =
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 
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         .init_time      = ixp4xx_timer_init,
321         .init_machine   = nas100d_init,
322 #if defined(CONFIG_PCI)
323         .dma_zone_size  = SZ_64M,
324 #endif
325         .restart        = ixp4xx_restart,
326 MACHINE_END
327 

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