1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * DSM-G600 board-setup
4 *
5 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
6 * Copyright (C) 2006 Tower Technologies
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 * based on nslu2-io.c:
13 * Copyright (C) 2004 Karen Spearel
14 *
15 * Author: Alessandro Zummo <a.zummo@towertech.it>
16 * Author: Michael Westerhof <mwester@dls.net>
17 * Author: Rod Whitby <rod@whitby.id.au>
18 * Maintainers: http://www.nslu2-linux.org/
19 */
20 #include <linux/gpio.h>
21 #include <linux/irq.h>
22 #include <linux/jiffies.h>
23 #include <linux/timer.h>
24 #include <linux/serial.h>
25 #include <linux/serial_8250.h>
26 #include <linux/leds.h>
27 #include <linux/reboot.h>
28 #include <linux/i2c.h>
29 #include <linux/gpio/machine.h>
30
31 #include <mach/hardware.h>
32
33 #include <asm/mach-types.h>
34 #include <asm/mach/arch.h>
35 #include <asm/mach/flash.h>
36 #include <asm/mach/time.h>
37
38 #include "irqs.h"
39
40 #define DSMG600_SDA_PIN 5
41 #define DSMG600_SCL_PIN 4
42
43 /* DSM-G600 Timer Setting */
44 #define DSMG600_FREQ 66000000
45
46 /* Buttons */
47 #define DSMG600_PB_GPIO 15 /* power button */
48 #define DSMG600_RB_GPIO 3 /* reset button */
49
50 /* Power control */
51 #define DSMG600_PO_GPIO 2 /* power off */
52
53 /* LEDs */
54 #define DSMG600_LED_PWR_GPIO 0
55 #define DSMG600_LED_WLAN_GPIO 14
56
57 static struct flash_platform_data dsmg600_flash_data = {
58 .map_name = "cfi_probe",
59 .width = 2,
60 };
61
62 static struct resource dsmg600_flash_resource = {
63 .flags = IORESOURCE_MEM,
64 };
65
66 static struct platform_device dsmg600_flash = {
67 .name = "IXP4XX-Flash",
68 .id = 0,
69 .dev.platform_data = &dsmg600_flash_data,
70 .num_resources = 1,
71 .resource = &dsmg600_flash_resource,
72 };
73
74 static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
75 .dev_id = "i2c-gpio.0",
76 .table = {
77 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
78 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
79 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
80 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
81 },
82 };
83
84 static struct platform_device dsmg600_i2c_gpio = {
85 .name = "i2c-gpio",
86 .id = 0,
87 .dev = {
88 .platform_data = NULL,
89 },
90 };
91
92 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
93 {
94 I2C_BOARD_INFO("pcf8563", 0x51),
95 },
96 };
97
98 static struct gpio_led dsmg600_led_pins[] = {
99 {
100 .name = "dsmg600:green:power",
101 .gpio = DSMG600_LED_PWR_GPIO,
102 },
103 {
104 .name = "dsmg600:green:wlan",
105 .gpio = DSMG600_LED_WLAN_GPIO,
106 .active_low = true,
107 },
108 };
109
110 static struct gpio_led_platform_data dsmg600_led_data = {
111 .num_leds = ARRAY_SIZE(dsmg600_led_pins),
112 .leds = dsmg600_led_pins,
113 };
114
115 static struct platform_device dsmg600_leds = {
116 .name = "leds-gpio",
117 .id = -1,
118 .dev.platform_data = &dsmg600_led_data,
119 };
120
121 static struct resource dsmg600_uart_resources[] = {
122 {
123 .start = IXP4XX_UART1_BASE_PHYS,
124 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
125 .flags = IORESOURCE_MEM,
126 },
127 {
128 .start = IXP4XX_UART2_BASE_PHYS,
129 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
130 .flags = IORESOURCE_MEM,
131 }
132 };
133
134 static struct plat_serial8250_port dsmg600_uart_data[] = {
135 {
136 .mapbase = IXP4XX_UART1_BASE_PHYS,
137 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
138 .irq = IRQ_IXP4XX_UART1,
139 .flags = UPF_BOOT_AUTOCONF,
140 .iotype = UPIO_MEM,
141 .regshift = 2,
142 .uartclk = IXP4XX_UART_XTAL,
143 },
144 {
145 .mapbase = IXP4XX_UART2_BASE_PHYS,
146 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
147 .irq = IRQ_IXP4XX_UART2,
148 .flags = UPF_BOOT_AUTOCONF,
149 .iotype = UPIO_MEM,
150 .regshift = 2,
151 .uartclk = IXP4XX_UART_XTAL,
152 },
153 { }
154 };
155
156 static struct platform_device dsmg600_uart = {
157 .name = "serial8250",
158 .id = PLAT8250_DEV_PLATFORM,
159 .dev.platform_data = dsmg600_uart_data,
160 .num_resources = ARRAY_SIZE(dsmg600_uart_resources),
161 .resource = dsmg600_uart_resources,
162 };
163
164 static struct platform_device *dsmg600_devices[] __initdata = {
165 &dsmg600_i2c_gpio,
166 &dsmg600_flash,
167 &dsmg600_leds,
168 };
169
dsmg600_power_off(void)170 static void dsmg600_power_off(void)
171 {
172 /* enable the pwr cntl and drive it high */
173 gpio_direction_output(DSMG600_PO_GPIO, 1);
174 }
175
176 /* This is used to make sure the power-button pusher is serious. The button
177 * must be held until the value of this counter reaches zero.
178 */
179 static int power_button_countdown;
180
181 /* Must hold the button down for at least this many counts to be processed */
182 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
183
184 static void dsmg600_power_handler(struct timer_list *unused);
185 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
186
dsmg600_power_handler(struct timer_list * unused)187 static void dsmg600_power_handler(struct timer_list *unused)
188 {
189 /* This routine is called twice per second to check the
190 * state of the power button.
191 */
192
193 if (gpio_get_value(DSMG600_PB_GPIO)) {
194
195 /* IO Pin is 1 (button pushed) */
196 if (power_button_countdown > 0)
197 power_button_countdown--;
198
199 } else {
200
201 /* Done on button release, to allow for auto-power-on mods. */
202 if (power_button_countdown == 0) {
203 /* Signal init to do the ctrlaltdel action,
204 * this will bypass init if it hasn't started
205 * and do a kernel_restart.
206 */
207 ctrl_alt_del();
208
209 /* Change the state of the power LED to "blink" */
210 gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
211 } else {
212 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
213 }
214 }
215
216 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
217 }
218
dsmg600_reset_handler(int irq,void * dev_id)219 static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
220 {
221 /* This is the paper-clip reset, it shuts the machine down directly. */
222 machine_power_off();
223
224 return IRQ_HANDLED;
225 }
226
dsmg600_timer_init(void)227 static void __init dsmg600_timer_init(void)
228 {
229 /* The xtal on this machine is non-standard. */
230 ixp4xx_timer_freq = DSMG600_FREQ;
231
232 /* Call standard timer_init function. */
233 ixp4xx_timer_init();
234 }
235
dsmg600_gpio_init(void)236 static int __init dsmg600_gpio_init(void)
237 {
238 if (!machine_is_dsmg600())
239 return 0;
240
241 gpio_request(DSMG600_RB_GPIO, "reset button");
242 if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
243 IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
244
245 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
246 gpio_to_irq(DSMG600_RB_GPIO));
247 }
248
249 /*
250 * The power button on the D-Link DSM-G600 is on GPIO 15, but
251 * it cannot handle interrupts on that GPIO line. So we'll
252 * have to poll it with a kernel timer.
253 */
254
255 /* Make sure that the power button GPIO is set up as an input */
256 gpio_request(DSMG600_PB_GPIO, "power button");
257 gpio_direction_input(DSMG600_PB_GPIO);
258 /* Request poweroff GPIO line */
259 gpio_request(DSMG600_PO_GPIO, "power off button");
260
261 /* Set the initial value for the power button IRQ handler */
262 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
263
264 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
265 return 0;
266 }
267 device_initcall(dsmg600_gpio_init);
268
dsmg600_init(void)269 static void __init dsmg600_init(void)
270 {
271 ixp4xx_sys_init();
272
273 dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
274 dsmg600_flash_resource.end =
275 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
276
277 gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
278 i2c_register_board_info(0, dsmg600_i2c_board_info,
279 ARRAY_SIZE(dsmg600_i2c_board_info));
280
281 /* The UART is required on the DSM-G600 (Redboot cannot use the
282 * NIC) -- do it here so that it does *not* get removed if
283 * platform_add_devices fails!
284 */
285 (void)platform_device_register(&dsmg600_uart);
286
287 platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
288
289 pm_power_off = dsmg600_power_off;
290 }
291
292 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
293 /* Maintainer: www.nslu2-linux.org */
294 .atag_offset = 0x100,
295 .map_io = ixp4xx_map_io,
296 .init_early = ixp4xx_init_early,
297 .init_irq = ixp4xx_init_irq,
298 .init_time = dsmg600_timer_init,
299 .init_machine = dsmg600_init,
300 #if defined(CONFIG_PCI)
301 .dma_zone_size = SZ_64M,
302 #endif
303 .restart = ixp4xx_restart,
304 MACHINE_END
305