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Linux/arch/arm/mach-ixp4xx/nslu2-setup.c

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  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 
 54 static struct flash_platform_data nslu2_flash_data = {
 55         .map_name               = "cfi_probe",
 56         .width                  = 2,
 57 };
 58 
 59 static struct resource nslu2_flash_resource = {
 60         .flags                  = IORESOURCE_MEM,
 61 };
 62 
 63 static 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 
 71 static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
 72         .sda_pin                = NSLU2_SDA_PIN,
 73         .scl_pin                = NSLU2_SCL_PIN,
 74 };
 75 
 76 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
 77         {
 78                 I2C_BOARD_INFO("x1205", 0x6f),
 79         },
 80 };
 81 
 82 static 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 
103 static struct gpio_led_platform_data nslu2_led_data = {
104         .num_leds               = ARRAY_SIZE(nslu2_led_pins),
105         .leds                   = nslu2_led_pins,
106 };
107 
108 static struct platform_device nslu2_leds = {
109         .name                   = "leds-gpio",
110         .id                     = -1,
111         .dev.platform_data      = &nslu2_led_data,
112 };
113 
114 static 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 
122 static struct platform_device nslu2_beeper = {
123         .name                   = "ixp4xx-beeper",
124         .id                     = NSLU2_GPIO_BUZZ,
125         .num_resources          = 0,
126 };
127 
128 static 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 
141 static 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 
163 static 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 */
172 static struct eth_plat_info nslu2_plat_eth[] = {
173         {
174                 .phy            = 1,
175                 .rxq            = 3,
176                 .txreadyq       = 20,
177         }
178 };
179 
180 static 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 
188 static 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 
196 static 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 
204 static 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 
214 static 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 
223 static 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 }
231 device_initcall(nslu2_gpio_init);
232 
233 static 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 
242 static 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_DISABLED | IRQF_TRIGGER_LOW,
269                 "NSLU2 reset button", NULL) < 0) {
270 
271                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
272                         gpio_to_irq(NSLU2_RB_GPIO));
273         }
274 
275         if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
276                 IRQF_DISABLED | IRQF_TRIGGER_HIGH,
277                 "NSLU2 power button", NULL) < 0) {
278 
279                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
280                         gpio_to_irq(NSLU2_PB_GPIO));
281         }
282 
283         /*
284          * Map in a portion of the flash and read the MAC address.
285          * Since it is stored in BE in the flash itself, we need to
286          * byteswap it if we're in LE mode.
287          */
288         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
289         if (f) {
290                 for (i = 0; i < 6; i++)
291 #ifdef __ARMEB__
292                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
293 #else
294                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
295 #endif
296                 iounmap(f);
297         }
298         printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
299                nslu2_plat_eth[0].hwaddr);
300 
301 }
302 
303 MACHINE_START(NSLU2, "Linksys NSLU2")
304         /* Maintainer: www.nslu2-linux.org */
305         .atag_offset    = 0x100,
306         .map_io         = ixp4xx_map_io,
307         .init_early     = ixp4xx_init_early,
308         .init_irq       = ixp4xx_init_irq,
309         .init_time      = nslu2_timer_init,
310         .init_machine   = nslu2_init,
311 #if defined(CONFIG_PCI)
312         .dma_zone_size  = SZ_64M,
313 #endif
314         .restart        = ixp4xx_restart,
315 MACHINE_END
316 

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