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 #include "irqs.h"
36
37 #define NSLU2_SDA_PIN 7
38 #define NSLU2_SCL_PIN 6
39
40 /* NSLU2 Timer */
41 #define NSLU2_FREQ 66000000
42
43 /* Buttons */
44 #define NSLU2_PB_GPIO 5 /* power button */
45 #define NSLU2_PO_GPIO 8 /* power off */
46 #define NSLU2_RB_GPIO 12 /* reset button */
47
48 /* Buzzer */
49 #define NSLU2_GPIO_BUZZ 4
50
51 /* LEDs */
52 #define NSLU2_LED_RED_GPIO 0
53 #define NSLU2_LED_GRN_GPIO 1
54 #define NSLU2_LED_DISK1_GPIO 3
55 #define NSLU2_LED_DISK2_GPIO 2
56
57 static struct flash_platform_data nslu2_flash_data = {
58 .map_name = "cfi_probe",
59 .width = 2,
60 };
61
62 static struct resource nslu2_flash_resource = {
63 .flags = IORESOURCE_MEM,
64 };
65
66 static struct platform_device nslu2_flash = {
67 .name = "IXP4XX-Flash",
68 .id = 0,
69 .dev.platform_data = &nslu2_flash_data,
70 .num_resources = 1,
71 .resource = &nslu2_flash_resource,
72 };
73
74 static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
75 .dev_id = "i2c-gpio.0",
76 .table = {
77 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
78 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
79 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
80 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
81 },
82 };
83
84 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
85 {
86 I2C_BOARD_INFO("x1205", 0x6f),
87 },
88 };
89
90 static struct gpio_led nslu2_led_pins[] = {
91 {
92 .name = "nslu2:green:ready",
93 .gpio = NSLU2_LED_GRN_GPIO,
94 },
95 {
96 .name = "nslu2:red:status",
97 .gpio = NSLU2_LED_RED_GPIO,
98 },
99 {
100 .name = "nslu2:green:disk-1",
101 .gpio = NSLU2_LED_DISK1_GPIO,
102 .active_low = true,
103 },
104 {
105 .name = "nslu2:green:disk-2",
106 .gpio = NSLU2_LED_DISK2_GPIO,
107 .active_low = true,
108 },
109 };
110
111 static struct gpio_led_platform_data nslu2_led_data = {
112 .num_leds = ARRAY_SIZE(nslu2_led_pins),
113 .leds = nslu2_led_pins,
114 };
115
116 static struct platform_device nslu2_leds = {
117 .name = "leds-gpio",
118 .id = -1,
119 .dev.platform_data = &nslu2_led_data,
120 };
121
122 static struct platform_device nslu2_i2c_gpio = {
123 .name = "i2c-gpio",
124 .id = 0,
125 .dev = {
126 .platform_data = NULL,
127 },
128 };
129
130 static struct resource nslu2_beeper_resources[] = {
131 {
132 .start = IRQ_IXP4XX_TIMER2,
133 .flags = IORESOURCE_IRQ,
134 },
135 };
136
137 static struct platform_device nslu2_beeper = {
138 .name = "ixp4xx-beeper",
139 .id = NSLU2_GPIO_BUZZ,
140 .resource = nslu2_beeper_resources,
141 .num_resources = ARRAY_SIZE(nslu2_beeper_resources),
142 };
143
144 static struct resource nslu2_uart_resources[] = {
145 {
146 .start = IXP4XX_UART1_BASE_PHYS,
147 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
148 .flags = IORESOURCE_MEM,
149 },
150 {
151 .start = IXP4XX_UART2_BASE_PHYS,
152 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
153 .flags = IORESOURCE_MEM,
154 }
155 };
156
157 static struct plat_serial8250_port nslu2_uart_data[] = {
158 {
159 .mapbase = IXP4XX_UART1_BASE_PHYS,
160 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
161 .irq = IRQ_IXP4XX_UART1,
162 .flags = UPF_BOOT_AUTOCONF,
163 .iotype = UPIO_MEM,
164 .regshift = 2,
165 .uartclk = IXP4XX_UART_XTAL,
166 },
167 {
168 .mapbase = IXP4XX_UART2_BASE_PHYS,
169 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
170 .irq = IRQ_IXP4XX_UART2,
171 .flags = UPF_BOOT_AUTOCONF,
172 .iotype = UPIO_MEM,
173 .regshift = 2,
174 .uartclk = IXP4XX_UART_XTAL,
175 },
176 { }
177 };
178
179 static struct platform_device nslu2_uart = {
180 .name = "serial8250",
181 .id = PLAT8250_DEV_PLATFORM,
182 .dev.platform_data = nslu2_uart_data,
183 .num_resources = 2,
184 .resource = nslu2_uart_resources,
185 };
186
187 /* Built-in 10/100 Ethernet MAC interfaces */
188 static struct resource nslu2_eth_resources[] = {
189 {
190 .start = IXP4XX_EthB_BASE_PHYS,
191 .end = IXP4XX_EthB_BASE_PHYS + 0x0fff,
192 .flags = IORESOURCE_MEM,
193 },
194 };
195
196 static struct eth_plat_info nslu2_plat_eth[] = {
197 {
198 .phy = 1,
199 .rxq = 3,
200 .txreadyq = 20,
201 }
202 };
203
204 static struct platform_device nslu2_eth[] = {
205 {
206 .name = "ixp4xx_eth",
207 .id = IXP4XX_ETH_NPEB,
208 .dev.platform_data = nslu2_plat_eth,
209 .num_resources = ARRAY_SIZE(nslu2_eth_resources),
210 .resource = nslu2_eth_resources,
211 }
212 };
213
214 static struct platform_device *nslu2_devices[] __initdata = {
215 &nslu2_i2c_gpio,
216 &nslu2_flash,
217 &nslu2_beeper,
218 &nslu2_leds,
219 &nslu2_eth[0],
220 };
221
nslu2_power_off(void)222 static void nslu2_power_off(void)
223 {
224 /* This causes the box to drop the power and go dead. */
225
226 /* enable the pwr cntl gpio and assert power off */
227 gpio_direction_output(NSLU2_PO_GPIO, 1);
228 }
229
nslu2_power_handler(int irq,void * dev_id)230 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
231 {
232 /* Signal init to do the ctrlaltdel action, this will bypass init if
233 * it hasn't started and do a kernel_restart.
234 */
235 ctrl_alt_del();
236
237 return IRQ_HANDLED;
238 }
239
nslu2_reset_handler(int irq,void * dev_id)240 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
241 {
242 /* This is the paper-clip reset, it shuts the machine down directly.
243 */
244 machine_power_off();
245
246 return IRQ_HANDLED;
247 }
248
nslu2_gpio_init(void)249 static int __init nslu2_gpio_init(void)
250 {
251 if (!machine_is_nslu2())
252 return 0;
253
254 /* Request the power off GPIO */
255 return gpio_request(NSLU2_PO_GPIO, "power off");
256 }
257 device_initcall(nslu2_gpio_init);
258
nslu2_timer_init(void)259 static void __init nslu2_timer_init(void)
260 {
261 /* The xtal on this machine is non-standard. */
262 ixp4xx_timer_freq = NSLU2_FREQ;
263
264 /* Call standard timer_init function. */
265 ixp4xx_timer_init();
266 }
267
nslu2_init(void)268 static void __init nslu2_init(void)
269 {
270 uint8_t __iomem *f;
271 int i;
272
273 ixp4xx_sys_init();
274
275 nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
276 nslu2_flash_resource.end =
277 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
278
279 gpiod_add_lookup_table(&nslu2_i2c_gpiod_table);
280 i2c_register_board_info(0, nslu2_i2c_board_info,
281 ARRAY_SIZE(nslu2_i2c_board_info));
282
283 /*
284 * This is only useful on a modified machine, but it is valuable
285 * to have it first in order to see debug messages, and so that
286 * it does *not* get removed if platform_add_devices fails!
287 */
288 (void)platform_device_register(&nslu2_uart);
289
290 platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
291
292 pm_power_off = nslu2_power_off;
293
294 if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
295 IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
296
297 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
298 gpio_to_irq(NSLU2_RB_GPIO));
299 }
300
301 if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
302 IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
303
304 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
305 gpio_to_irq(NSLU2_PB_GPIO));
306 }
307
308 /*
309 * Map in a portion of the flash and read the MAC address.
310 * Since it is stored in BE in the flash itself, we need to
311 * byteswap it if we're in LE mode.
312 */
313 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
314 if (f) {
315 for (i = 0; i < 6; i++)
316 #ifdef __ARMEB__
317 nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
318 #else
319 nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
320 #endif
321 iounmap(f);
322 }
323 printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
324 nslu2_plat_eth[0].hwaddr);
325
326 }
327
328 MACHINE_START(NSLU2, "Linksys NSLU2")
329 /* Maintainer: www.nslu2-linux.org */
330 .atag_offset = 0x100,
331 .map_io = ixp4xx_map_io,
332 .init_early = ixp4xx_init_early,
333 .init_irq = ixp4xx_init_irq,
334 .init_time = nslu2_timer_init,
335 .init_machine = nslu2_init,
336 #if defined(CONFIG_PCI)
337 .dma_zone_size = SZ_64M,
338 #endif
339 .restart = ixp4xx_restart,
340 MACHINE_END
341