1 // SPDX-License-Identifier: GPL-2.0
3 * arch/arm/mach-ixp4xx/nslu2-setup.c
7 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
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
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/
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>
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 #include <mach/hardware.h>
38 #define NSLU2_SDA_PIN 7
39 #define NSLU2_SCL_PIN 6
42 #define NSLU2_FREQ 66000000
45 #define NSLU2_PB_GPIO 5 /* power button */
46 #define NSLU2_PO_GPIO 8 /* power off */
47 #define NSLU2_RB_GPIO 12 /* reset button */
50 #define NSLU2_GPIO_BUZZ 4
53 #define NSLU2_LED_RED_GPIO 0
54 #define NSLU2_LED_GRN_GPIO 1
55 #define NSLU2_LED_DISK1_GPIO 3
56 #define NSLU2_LED_DISK2_GPIO 2
58 static struct flash_platform_data nslu2_flash_data = {
59 .map_name = "cfi_probe",
63 static struct resource nslu2_flash_resource = {
64 .flags = IORESOURCE_MEM,
67 static struct platform_device nslu2_flash = {
68 .name = "IXP4XX-Flash",
70 .dev.platform_data = &nslu2_flash_data,
72 .resource = &nslu2_flash_resource,
75 static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
76 .dev_id = "i2c-gpio.0",
78 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
79 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
80 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
81 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
85 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
87 I2C_BOARD_INFO("x1205", 0x6f),
91 static struct gpio_led nslu2_led_pins[] = {
93 .name = "nslu2:green:ready",
94 .gpio = NSLU2_LED_GRN_GPIO,
97 .name = "nslu2:red:status",
98 .gpio = NSLU2_LED_RED_GPIO,
101 .name = "nslu2:green:disk-1",
102 .gpio = NSLU2_LED_DISK1_GPIO,
106 .name = "nslu2:green:disk-2",
107 .gpio = NSLU2_LED_DISK2_GPIO,
112 static struct gpio_led_platform_data nslu2_led_data = {
113 .num_leds = ARRAY_SIZE(nslu2_led_pins),
114 .leds = nslu2_led_pins,
117 static struct platform_device nslu2_leds = {
120 .dev.platform_data = &nslu2_led_data,
123 static struct platform_device nslu2_i2c_gpio = {
127 .platform_data = NULL,
131 static struct resource nslu2_beeper_resources[] = {
133 .start = IRQ_IXP4XX_TIMER2,
134 .flags = IORESOURCE_IRQ,
138 static struct platform_device nslu2_beeper = {
139 .name = "ixp4xx-beeper",
140 .id = NSLU2_GPIO_BUZZ,
141 .resource = nslu2_beeper_resources,
142 .num_resources = ARRAY_SIZE(nslu2_beeper_resources),
145 static struct resource nslu2_uart_resources[] = {
147 .start = IXP4XX_UART1_BASE_PHYS,
148 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
149 .flags = IORESOURCE_MEM,
152 .start = IXP4XX_UART2_BASE_PHYS,
153 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
154 .flags = IORESOURCE_MEM,
158 static struct plat_serial8250_port nslu2_uart_data[] = {
160 .mapbase = IXP4XX_UART1_BASE_PHYS,
161 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
162 .irq = IRQ_IXP4XX_UART1,
163 .flags = UPF_BOOT_AUTOCONF,
166 .uartclk = IXP4XX_UART_XTAL,
169 .mapbase = IXP4XX_UART2_BASE_PHYS,
170 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
171 .irq = IRQ_IXP4XX_UART2,
172 .flags = UPF_BOOT_AUTOCONF,
175 .uartclk = IXP4XX_UART_XTAL,
180 static struct platform_device nslu2_uart = {
181 .name = "serial8250",
182 .id = PLAT8250_DEV_PLATFORM,
183 .dev.platform_data = nslu2_uart_data,
185 .resource = nslu2_uart_resources,
188 /* Built-in 10/100 Ethernet MAC interfaces */
189 static struct resource nslu2_eth_resources[] = {
191 .start = IXP4XX_EthB_BASE_PHYS,
192 .end = IXP4XX_EthB_BASE_PHYS + 0x0fff,
193 .flags = IORESOURCE_MEM,
197 static struct eth_plat_info nslu2_plat_eth[] = {
205 static struct platform_device nslu2_eth[] = {
207 .name = "ixp4xx_eth",
208 .id = IXP4XX_ETH_NPEB,
209 .dev.platform_data = nslu2_plat_eth,
210 .num_resources = ARRAY_SIZE(nslu2_eth_resources),
211 .resource = nslu2_eth_resources,
215 static struct platform_device *nslu2_devices[] __initdata = {
223 static void nslu2_power_off(void)
225 /* This causes the box to drop the power and go dead. */
227 /* enable the pwr cntl gpio and assert power off */
228 gpio_direction_output(NSLU2_PO_GPIO, 1);
231 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
233 /* Signal init to do the ctrlaltdel action, this will bypass init if
234 * it hasn't started and do a kernel_restart.
241 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
243 /* This is the paper-clip reset, it shuts the machine down directly.
250 static int __init nslu2_gpio_init(void)
252 if (!machine_is_nslu2())
255 /* Request the power off GPIO */
256 return gpio_request(NSLU2_PO_GPIO, "power off");
258 device_initcall(nslu2_gpio_init);
260 static void __init nslu2_timer_init(void)
262 /* The xtal on this machine is non-standard. */
263 ixp4xx_timer_freq = NSLU2_FREQ;
265 /* Call standard timer_init function. */
269 static void __init nslu2_init(void)
276 nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
277 nslu2_flash_resource.end =
278 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
280 gpiod_add_lookup_table(&nslu2_i2c_gpiod_table);
281 i2c_register_board_info(0, nslu2_i2c_board_info,
282 ARRAY_SIZE(nslu2_i2c_board_info));
285 * This is only useful on a modified machine, but it is valuable
286 * to have it first in order to see debug messages, and so that
287 * it does *not* get removed if platform_add_devices fails!
289 (void)platform_device_register(&nslu2_uart);
291 platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
293 pm_power_off = nslu2_power_off;
295 if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
296 IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
298 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
299 gpio_to_irq(NSLU2_RB_GPIO));
302 if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
303 IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
305 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
306 gpio_to_irq(NSLU2_PB_GPIO));
310 * Map in a portion of the flash and read the MAC address.
311 * Since it is stored in BE in the flash itself, we need to
312 * byteswap it if we're in LE mode.
314 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
316 for (i = 0; i < 6; i++)
318 nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
320 nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
324 printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
325 nslu2_plat_eth[0].hwaddr);
329 MACHINE_START(NSLU2, "Linksys NSLU2")
330 /* Maintainer: www.nslu2-linux.org */
331 .atag_offset = 0x100,
332 .map_io = ixp4xx_map_io,
333 .init_early = ixp4xx_init_early,
334 .init_irq = ixp4xx_init_irq,
335 .init_time = nslu2_timer_init,
336 .init_machine = nslu2_init,
337 #if defined(CONFIG_PCI)
338 .dma_zone_size = SZ_64M,
340 .restart = ixp4xx_restart,