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>
35 #define NSLU2_SDA_PIN 7
36 #define NSLU2_SCL_PIN 6
39 #define NSLU2_FREQ 66000000
42 #define NSLU2_PB_GPIO 5 /* power button */
43 #define NSLU2_PO_GPIO 8 /* power off */
44 #define NSLU2_RB_GPIO 12 /* reset button */
47 #define NSLU2_GPIO_BUZZ 4
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
55 static struct flash_platform_data nslu2_flash_data
= {
56 .map_name
= "cfi_probe",
60 static struct resource nslu2_flash_resource
= {
61 .flags
= IORESOURCE_MEM
,
64 static struct platform_device nslu2_flash
= {
65 .name
= "IXP4XX-Flash",
67 .dev
.platform_data
= &nslu2_flash_data
,
69 .resource
= &nslu2_flash_resource
,
72 static struct gpiod_lookup_table nslu2_i2c_gpiod_table
= {
73 .dev_id
= "i2c-gpio.0",
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
),
82 static struct i2c_board_info __initdata nslu2_i2c_board_info
[] = {
84 I2C_BOARD_INFO("x1205", 0x6f),
88 static struct gpio_led nslu2_led_pins
[] = {
90 .name
= "nslu2:green:ready",
91 .gpio
= NSLU2_LED_GRN_GPIO
,
94 .name
= "nslu2:red:status",
95 .gpio
= NSLU2_LED_RED_GPIO
,
98 .name
= "nslu2:green:disk-1",
99 .gpio
= NSLU2_LED_DISK1_GPIO
,
103 .name
= "nslu2:green:disk-2",
104 .gpio
= NSLU2_LED_DISK2_GPIO
,
109 static struct gpio_led_platform_data nslu2_led_data
= {
110 .num_leds
= ARRAY_SIZE(nslu2_led_pins
),
111 .leds
= nslu2_led_pins
,
114 static struct platform_device nslu2_leds
= {
117 .dev
.platform_data
= &nslu2_led_data
,
120 static struct platform_device nslu2_i2c_gpio
= {
124 .platform_data
= NULL
,
128 static struct platform_device nslu2_beeper
= {
129 .name
= "ixp4xx-beeper",
130 .id
= NSLU2_GPIO_BUZZ
,
134 static struct resource nslu2_uart_resources
[] = {
136 .start
= IXP4XX_UART1_BASE_PHYS
,
137 .end
= IXP4XX_UART1_BASE_PHYS
+ 0x0fff,
138 .flags
= IORESOURCE_MEM
,
141 .start
= IXP4XX_UART2_BASE_PHYS
,
142 .end
= IXP4XX_UART2_BASE_PHYS
+ 0x0fff,
143 .flags
= IORESOURCE_MEM
,
147 static struct plat_serial8250_port nslu2_uart_data
[] = {
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
,
155 .uartclk
= IXP4XX_UART_XTAL
,
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
,
164 .uartclk
= IXP4XX_UART_XTAL
,
169 static struct platform_device nslu2_uart
= {
170 .name
= "serial8250",
171 .id
= PLAT8250_DEV_PLATFORM
,
172 .dev
.platform_data
= nslu2_uart_data
,
174 .resource
= nslu2_uart_resources
,
177 /* Built-in 10/100 Ethernet MAC interfaces */
178 static struct eth_plat_info nslu2_plat_eth
[] = {
186 static struct platform_device nslu2_eth
[] = {
188 .name
= "ixp4xx_eth",
189 .id
= IXP4XX_ETH_NPEB
,
190 .dev
.platform_data
= nslu2_plat_eth
,
194 static struct platform_device
*nslu2_devices
[] __initdata
= {
202 static void nslu2_power_off(void)
204 /* This causes the box to drop the power and go dead. */
206 /* enable the pwr cntl gpio and assert power off */
207 gpio_direction_output(NSLU2_PO_GPIO
, 1);
210 static irqreturn_t
nslu2_power_handler(int irq
, void *dev_id
)
212 /* Signal init to do the ctrlaltdel action, this will bypass init if
213 * it hasn't started and do a kernel_restart.
220 static irqreturn_t
nslu2_reset_handler(int irq
, void *dev_id
)
222 /* This is the paper-clip reset, it shuts the machine down directly.
229 static int __init
nslu2_gpio_init(void)
231 if (!machine_is_nslu2())
234 /* Request the power off GPIO */
235 return gpio_request(NSLU2_PO_GPIO
, "power off");
237 device_initcall(nslu2_gpio_init
);
239 static void __init
nslu2_timer_init(void)
241 /* The xtal on this machine is non-standard. */
242 ixp4xx_timer_freq
= NSLU2_FREQ
;
244 /* Call standard timer_init function. */
248 static void __init
nslu2_init(void)
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;
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
));
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!
268 (void)platform_device_register(&nslu2_uart
);
270 platform_add_devices(nslu2_devices
, ARRAY_SIZE(nslu2_devices
));
272 pm_power_off
= nslu2_power_off
;
274 if (request_irq(gpio_to_irq(NSLU2_RB_GPIO
), &nslu2_reset_handler
,
275 IRQF_TRIGGER_LOW
, "NSLU2 reset button", NULL
) < 0) {
277 printk(KERN_DEBUG
"Reset Button IRQ %d not available\n",
278 gpio_to_irq(NSLU2_RB_GPIO
));
281 if (request_irq(gpio_to_irq(NSLU2_PB_GPIO
), &nslu2_power_handler
,
282 IRQF_TRIGGER_HIGH
, "NSLU2 power button", NULL
) < 0) {
284 printk(KERN_DEBUG
"Power Button IRQ %d not available\n",
285 gpio_to_irq(NSLU2_PB_GPIO
));
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.
293 f
= ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
295 for (i
= 0; i
< 6; i
++)
297 nslu2_plat_eth
[0].hwaddr
[i
] = readb(f
+ 0x3FFB0 + i
);
299 nslu2_plat_eth
[0].hwaddr
[i
] = readb(f
+ 0x3FFB0 + (i
^3));
303 printk(KERN_INFO
"NSLU2: Using MAC address %pM for port 0\n",
304 nslu2_plat_eth
[0].hwaddr
);
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
,
319 .restart
= ixp4xx_restart
,