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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * arch/arm/mach-ixp4xx/nslu2-setup.c
  4  *
  5  * NSLU2 board-setup
  6  *
  7  * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
  8  *
  9  * based on ixdp425-setup.c:
 10  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
 11  * based on nslu2-power.c:
 12  *      Copyright (C) 2005 Tower Technologies
 13  *
 14  * Author: Mark Rakes <mrakes at mac.com>
 15  * Author: Rod Whitby <rod@whitby.id.au>
 16  * Author: Alessandro Zummo <a.zummo@towertech.it>
 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/serial.h>
 24 #include <linux/serial_8250.h>
 25 #include <linux/leds.h>
 26 #include <linux/reboot.h>
 27 #include <linux/i2c.h>
 28 #include <linux/gpio/machine.h>
 29 #include <linux/io.h>
 30 #include <asm/mach-types.h>
 31 #include <asm/mach/arch.h>
 32 #include <asm/mach/flash.h>
 33 #include <asm/mach/time.h>
 34 
 35 #define NSLU2_SDA_PIN           7
 36 #define NSLU2_SCL_PIN           6
 37 
 38 /* NSLU2 Timer */
 39 #define NSLU2_FREQ 66000000
 40 
 41 /* Buttons */
 42 #define NSLU2_PB_GPIO           5       /* power button */
 43 #define NSLU2_PO_GPIO           8       /* power off */
 44 #define NSLU2_RB_GPIO           12      /* reset button */
 45 
 46 /* Buzzer */
 47 #define NSLU2_GPIO_BUZZ         4
 48 
 49 /* LEDs */
 50 #define NSLU2_LED_RED_GPIO      0
 51 #define NSLU2_LED_GRN_GPIO      1
 52 #define NSLU2_LED_DISK1_GPIO    3
 53 #define NSLU2_LED_DISK2_GPIO    2
 54 
 55 static struct flash_platform_data nslu2_flash_data = {
 56         .map_name               = "cfi_probe",
 57         .width                  = 2,
 58 };
 59 
 60 static struct resource nslu2_flash_resource = {
 61         .flags                  = IORESOURCE_MEM,
 62 };
 63 
 64 static struct platform_device nslu2_flash = {
 65         .name                   = "IXP4XX-Flash",
 66         .id                     = 0,
 67         .dev.platform_data      = &nslu2_flash_data,
 68         .num_resources          = 1,
 69         .resource               = &nslu2_flash_resource,
 70 };
 71 
 72 static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
 73         .dev_id         = "i2c-gpio.0",
 74         .table          = {
 75                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
 76                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 77                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
 78                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 79         },
 80 };
 81 
 82 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
 83         {
 84                 I2C_BOARD_INFO("x1205", 0x6f),
 85         },
 86 };
 87 
 88 static struct gpio_led nslu2_led_pins[] = {
 89         {
 90                 .name           = "nslu2:green:ready",
 91                 .gpio           = NSLU2_LED_GRN_GPIO,
 92         },
 93         {
 94                 .name           = "nslu2:red:status",
 95                 .gpio           = NSLU2_LED_RED_GPIO,
 96         },
 97         {
 98                 .name           = "nslu2:green:disk-1",
 99                 .gpio           = NSLU2_LED_DISK1_GPIO,
100                 .active_low     = true,
101         },
102         {
103                 .name           = "nslu2:green:disk-2",
104                 .gpio           = NSLU2_LED_DISK2_GPIO,
105                 .active_low     = true,
106         },
107 };
108 
109 static struct gpio_led_platform_data nslu2_led_data = {
110         .num_leds               = ARRAY_SIZE(nslu2_led_pins),
111         .leds                   = nslu2_led_pins,
112 };
113 
114 static struct platform_device nslu2_leds = {
115         .name                   = "leds-gpio",
116         .id                     = -1,
117         .dev.platform_data      = &nslu2_led_data,
118 };
119 
120 static struct platform_device nslu2_i2c_gpio = {
121         .name                   = "i2c-gpio",
122         .id                     = 0,
123         .dev     = {
124                 .platform_data  = NULL,
125         },
126 };
127 
128 static struct platform_device nslu2_beeper = {
129         .name                   = "ixp4xx-beeper",
130         .id                     = NSLU2_GPIO_BUZZ,
131         .num_resources          = 0,
132 };
133 
134 static struct resource nslu2_uart_resources[] = {
135         {
136                 .start          = IXP4XX_UART1_BASE_PHYS,
137                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
138                 .flags          = IORESOURCE_MEM,
139         },
140         {
141                 .start          = IXP4XX_UART2_BASE_PHYS,
142                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
143                 .flags          = IORESOURCE_MEM,
144         }
145 };
146 
147 static struct plat_serial8250_port nslu2_uart_data[] = {
148         {
149                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
150                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
151                 .irq            = IRQ_IXP4XX_UART1,
152                 .flags          = UPF_BOOT_AUTOCONF,
153                 .iotype         = UPIO_MEM,
154                 .regshift       = 2,
155                 .uartclk        = IXP4XX_UART_XTAL,
156         },
157         {
158                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
159                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
160                 .irq            = IRQ_IXP4XX_UART2,
161                 .flags          = UPF_BOOT_AUTOCONF,
162                 .iotype         = UPIO_MEM,
163                 .regshift       = 2,
164                 .uartclk        = IXP4XX_UART_XTAL,
165         },
166         { }
167 };
168 
169 static struct platform_device nslu2_uart = {
170         .name                   = "serial8250",
171         .id                     = PLAT8250_DEV_PLATFORM,
172         .dev.platform_data      = nslu2_uart_data,
173         .num_resources          = 2,
174         .resource               = nslu2_uart_resources,
175 };
176 
177 /* Built-in 10/100 Ethernet MAC interfaces */
178 static struct eth_plat_info nslu2_plat_eth[] = {
179         {
180                 .phy            = 1,
181                 .rxq            = 3,
182                 .txreadyq       = 20,
183         }
184 };
185 
186 static struct platform_device nslu2_eth[] = {
187         {
188                 .name                   = "ixp4xx_eth",
189                 .id                     = IXP4XX_ETH_NPEB,
190                 .dev.platform_data      = nslu2_plat_eth,
191         }
192 };
193 
194 static struct platform_device *nslu2_devices[] __initdata = {
195         &nslu2_i2c_gpio,
196         &nslu2_flash,
197         &nslu2_beeper,
198         &nslu2_leds,
199         &nslu2_eth[0],
200 };
201 
202 static void nslu2_power_off(void)
203 {
204         /* This causes the box to drop the power and go dead. */
205 
206         /* enable the pwr cntl gpio and assert power off */
207         gpio_direction_output(NSLU2_PO_GPIO, 1);
208 }
209 
210 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
211 {
212         /* Signal init to do the ctrlaltdel action, this will bypass init if
213          * it hasn't started and do a kernel_restart.
214          */
215         ctrl_alt_del();
216 
217         return IRQ_HANDLED;
218 }
219 
220 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
221 {
222         /* This is the paper-clip reset, it shuts the machine down directly.
223          */
224         machine_power_off();
225 
226         return IRQ_HANDLED;
227 }
228 
229 static int __init nslu2_gpio_init(void)
230 {
231         if (!machine_is_nslu2())
232                 return 0;
233 
234         /* Request the power off GPIO */
235         return gpio_request(NSLU2_PO_GPIO, "power off");
236 }
237 device_initcall(nslu2_gpio_init);
238 
239 static void __init nslu2_timer_init(void)
240 {
241     /* The xtal on this machine is non-standard. */
242     ixp4xx_timer_freq = NSLU2_FREQ;
243 
244     /* Call standard timer_init function. */
245     ixp4xx_timer_init();
246 }
247 
248 static void __init nslu2_init(void)
249 {
250         uint8_t __iomem *f;
251         int i;
252 
253         ixp4xx_sys_init();
254 
255         nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
256         nslu2_flash_resource.end =
257                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
258 
259         gpiod_add_lookup_table(&nslu2_i2c_gpiod_table);
260         i2c_register_board_info(0, nslu2_i2c_board_info,
261                                 ARRAY_SIZE(nslu2_i2c_board_info));
262 
263         /*
264          * This is only useful on a modified machine, but it is valuable
265          * to have it first in order to see debug messages, and so that
266          * it does *not* get removed if platform_add_devices fails!
267          */
268         (void)platform_device_register(&nslu2_uart);
269 
270         platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
271 
272         pm_power_off = nslu2_power_off;
273 
274         if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
275                 IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
276 
277                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
278                         gpio_to_irq(NSLU2_RB_GPIO));
279         }
280 
281         if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
282                 IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
283 
284                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
285                         gpio_to_irq(NSLU2_PB_GPIO));
286         }
287 
288         /*
289          * Map in a portion of the flash and read the MAC address.
290          * Since it is stored in BE in the flash itself, we need to
291          * byteswap it if we're in LE mode.
292          */
293         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
294         if (f) {
295                 for (i = 0; i < 6; i++)
296 #ifdef __ARMEB__
297                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
298 #else
299                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
300 #endif
301                 iounmap(f);
302         }
303         printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
304                nslu2_plat_eth[0].hwaddr);
305 
306 }
307 
308 MACHINE_START(NSLU2, "Linksys NSLU2")
309         /* Maintainer: www.nslu2-linux.org */
310         .atag_offset    = 0x100,
311         .map_io         = ixp4xx_map_io,
312         .init_early     = ixp4xx_init_early,
313         .init_irq       = ixp4xx_init_irq,
314         .init_time      = nslu2_timer_init,
315         .init_machine   = nslu2_init,
316 #if defined(CONFIG_PCI)
317         .dma_zone_size  = SZ_64M,
318 #endif
319         .restart        = ixp4xx_restart,
320 MACHINE_END
321 

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