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 #define DSMG600_SDA_PIN 5
39 #define DSMG600_SCL_PIN 4
40
41 /* DSM-G600 Timer Setting */
42 #define DSMG600_FREQ 66000000
43
44 /* Buttons */
45 #define DSMG600_PB_GPIO 15 /* power button */
46 #define DSMG600_RB_GPIO 3 /* reset button */
47
48 /* Power control */
49 #define DSMG600_PO_GPIO 2 /* power off */
50
51 /* LEDs */
52 #define DSMG600_LED_PWR_GPIO 0
53 #define DSMG600_LED_WLAN_GPIO 14
54
55 static struct flash_platform_data dsmg600_flash_data = {
56 .map_name = "cfi_probe",
57 .width = 2,
58 };
59
60 static struct resource dsmg600_flash_resource = {
61 .flags = IORESOURCE_MEM,
62 };
63
64 static struct platform_device dsmg600_flash = {
65 .name = "IXP4XX-Flash",
66 .id = 0,
67 .dev.platform_data = &dsmg600_flash_data,
68 .num_resources = 1,
69 .resource = &dsmg600_flash_resource,
70 };
71
72 static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
73 .dev_id = "i2c-gpio.0",
74 .table = {
75 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
76 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
77 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
78 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
79 },
80 };
81
82 static struct platform_device dsmg600_i2c_gpio = {
83 .name = "i2c-gpio",
84 .id = 0,
85 .dev = {
86 .platform_data = NULL,
87 },
88 };
89
90 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
91 {
92 I2C_BOARD_INFO("pcf8563", 0x51),
93 },
94 };
95
96 static struct gpio_led dsmg600_led_pins[] = {
97 {
98 .name = "dsmg600:green:power",
99 .gpio = DSMG600_LED_PWR_GPIO,
100 },
101 {
102 .name = "dsmg600:green:wlan",
103 .gpio = DSMG600_LED_WLAN_GPIO,
104 .active_low = true,
105 },
106 };
107
108 static struct gpio_led_platform_data dsmg600_led_data = {
109 .num_leds = ARRAY_SIZE(dsmg600_led_pins),
110 .leds = dsmg600_led_pins,
111 };
112
113 static struct platform_device dsmg600_leds = {
114 .name = "leds-gpio",
115 .id = -1,
116 .dev.platform_data = &dsmg600_led_data,
117 };
118
119 static struct resource dsmg600_uart_resources[] = {
120 {
121 .start = IXP4XX_UART1_BASE_PHYS,
122 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
123 .flags = IORESOURCE_MEM,
124 },
125 {
126 .start = IXP4XX_UART2_BASE_PHYS,
127 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
128 .flags = IORESOURCE_MEM,
129 }
130 };
131
132 static struct plat_serial8250_port dsmg600_uart_data[] = {
133 {
134 .mapbase = IXP4XX_UART1_BASE_PHYS,
135 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
136 .irq = IRQ_IXP4XX_UART1,
137 .flags = UPF_BOOT_AUTOCONF,
138 .iotype = UPIO_MEM,
139 .regshift = 2,
140 .uartclk = IXP4XX_UART_XTAL,
141 },
142 {
143 .mapbase = IXP4XX_UART2_BASE_PHYS,
144 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
145 .irq = IRQ_IXP4XX_UART2,
146 .flags = UPF_BOOT_AUTOCONF,
147 .iotype = UPIO_MEM,
148 .regshift = 2,
149 .uartclk = IXP4XX_UART_XTAL,
150 },
151 { }
152 };
153
154 static struct platform_device dsmg600_uart = {
155 .name = "serial8250",
156 .id = PLAT8250_DEV_PLATFORM,
157 .dev.platform_data = dsmg600_uart_data,
158 .num_resources = ARRAY_SIZE(dsmg600_uart_resources),
159 .resource = dsmg600_uart_resources,
160 };
161
162 static struct platform_device *dsmg600_devices[] __initdata = {
163 &dsmg600_i2c_gpio,
164 &dsmg600_flash,
165 &dsmg600_leds,
166 };
167
dsmg600_power_off(void)168 static void dsmg600_power_off(void)
169 {
170 /* enable the pwr cntl and drive it high */
171 gpio_direction_output(DSMG600_PO_GPIO, 1);
172 }
173
174 /* This is used to make sure the power-button pusher is serious. The button
175 * must be held until the value of this counter reaches zero.
176 */
177 static int power_button_countdown;
178
179 /* Must hold the button down for at least this many counts to be processed */
180 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
181
182 static void dsmg600_power_handler(struct timer_list *unused);
183 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
184
dsmg600_power_handler(struct timer_list * unused)185 static void dsmg600_power_handler(struct timer_list *unused)
186 {
187 /* This routine is called twice per second to check the
188 * state of the power button.
189 */
190
191 if (gpio_get_value(DSMG600_PB_GPIO)) {
192
193 /* IO Pin is 1 (button pushed) */
194 if (power_button_countdown > 0)
195 power_button_countdown--;
196
197 } else {
198
199 /* Done on button release, to allow for auto-power-on mods. */
200 if (power_button_countdown == 0) {
201 /* Signal init to do the ctrlaltdel action,
202 * this will bypass init if it hasn't started
203 * and do a kernel_restart.
204 */
205 ctrl_alt_del();
206
207 /* Change the state of the power LED to "blink" */
208 gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
209 } else {
210 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
211 }
212 }
213
214 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
215 }
216
dsmg600_reset_handler(int irq,void * dev_id)217 static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
218 {
219 /* This is the paper-clip reset, it shuts the machine down directly. */
220 machine_power_off();
221
222 return IRQ_HANDLED;
223 }
224
dsmg600_timer_init(void)225 static void __init dsmg600_timer_init(void)
226 {
227 /* The xtal on this machine is non-standard. */
228 ixp4xx_timer_freq = DSMG600_FREQ;
229
230 /* Call standard timer_init function. */
231 ixp4xx_timer_init();
232 }
233
dsmg600_gpio_init(void)234 static int __init dsmg600_gpio_init(void)
235 {
236 if (!machine_is_dsmg600())
237 return 0;
238
239 gpio_request(DSMG600_RB_GPIO, "reset button");
240 if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
241 IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
242
243 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
244 gpio_to_irq(DSMG600_RB_GPIO));
245 }
246
247 /*
248 * The power button on the D-Link DSM-G600 is on GPIO 15, but
249 * it cannot handle interrupts on that GPIO line. So we'll
250 * have to poll it with a kernel timer.
251 */
252
253 /* Make sure that the power button GPIO is set up as an input */
254 gpio_request(DSMG600_PB_GPIO, "power button");
255 gpio_direction_input(DSMG600_PB_GPIO);
256 /* Request poweroff GPIO line */
257 gpio_request(DSMG600_PO_GPIO, "power off button");
258
259 /* Set the initial value for the power button IRQ handler */
260 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
261
262 mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
263 return 0;
264 }
265 device_initcall(dsmg600_gpio_init);
266
dsmg600_init(void)267 static void __init dsmg600_init(void)
268 {
269 ixp4xx_sys_init();
270
271 /* Make sure that GPIO14 and GPIO15 are not used as clocks */
272 *IXP4XX_GPIO_GPCLKR = 0;
273
274 dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
275 dsmg600_flash_resource.end =
276 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
277
278 gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
279 i2c_register_board_info(0, dsmg600_i2c_board_info,
280 ARRAY_SIZE(dsmg600_i2c_board_info));
281
282 /* The UART is required on the DSM-G600 (Redboot cannot use the
283 * NIC) -- do it here so that it does *not* get removed if
284 * platform_add_devices fails!
285 */
286 (void)platform_device_register(&dsmg600_uart);
287
288 platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
289
290 pm_power_off = dsmg600_power_off;
291 }
292
293 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
294 /* Maintainer: www.nslu2-linux.org */
295 .atag_offset = 0x100,
296 .map_io = ixp4xx_map_io,
297 .init_early = ixp4xx_init_early,
298 .init_irq = ixp4xx_init_irq,
299 .init_time = dsmg600_timer_init,
300 .init_machine = dsmg600_init,
301 #if defined(CONFIG_PCI)
302 .dma_zone_size = SZ_64M,
303 #endif
304 .restart = ixp4xx_restart,
305 MACHINE_END
306
