1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/arm/mach-ixp4xx/nas100d-setup.c
4 *
5 * NAS 100d 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 nas100d-power.c:
12 * Copyright (C) 2005 Tower Technologies
13 * based on nas100d-io.c
14 * Copyright (C) 2004 Karen Spearel
15 *
16 * Author: Alessandro Zummo <a.zummo@towertech.it>
17 * Author: Rod Whitby <rod@whitby.id.au>
18 * Maintainers: http://www.nslu2-linux.org/
19 *
20 */
21 #include <linux/gpio.h>
22 #include <linux/if_ether.h>
23 #include <linux/irq.h>
24 #include <linux/jiffies.h>
25 #include <linux/timer.h>
26 #include <linux/serial.h>
27 #include <linux/serial_8250.h>
28 #include <linux/leds.h>
29 #include <linux/reboot.h>
30 #include <linux/i2c.h>
31 #include <linux/gpio/machine.h>
32 #include <linux/io.h>
33 #include <asm/mach-types.h>
34 #include <asm/mach/arch.h>
35 #include <asm/mach/flash.h>
36
37 #define NAS100D_SDA_PIN 5
38 #define NAS100D_SCL_PIN 6
39
40 /* Buttons */
41 #define NAS100D_PB_GPIO 14 /* power button */
42 #define NAS100D_RB_GPIO 4 /* reset button */
43
44 /* Power control */
45 #define NAS100D_PO_GPIO 12 /* power off */
46
47 /* LEDs */
48 #define NAS100D_LED_WLAN_GPIO 0
49 #define NAS100D_LED_DISK_GPIO 3
50 #define NAS100D_LED_PWR_GPIO 15
51
52 static struct flash_platform_data nas100d_flash_data = {
53 .map_name = "cfi_probe",
54 .width = 2,
55 };
56
57 static struct resource nas100d_flash_resource = {
58 .flags = IORESOURCE_MEM,
59 };
60
61 static struct platform_device nas100d_flash = {
62 .name = "IXP4XX-Flash",
63 .id = 0,
64 .dev.platform_data = &nas100d_flash_data,
65 .num_resources = 1,
66 .resource = &nas100d_flash_resource,
67 };
68
69 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
70 {
71 I2C_BOARD_INFO("pcf8563", 0x51),
72 },
73 };
74
75 static struct gpio_led nas100d_led_pins[] = {
76 {
77 .name = "nas100d:green:wlan",
78 .gpio = NAS100D_LED_WLAN_GPIO,
79 .active_low = true,
80 },
81 {
82 .name = "nas100d:blue:power", /* (off=flashing) */
83 .gpio = NAS100D_LED_PWR_GPIO,
84 .active_low = true,
85 },
86 {
87 .name = "nas100d:yellow:disk",
88 .gpio = NAS100D_LED_DISK_GPIO,
89 .active_low = true,
90 },
91 };
92
93 static struct gpio_led_platform_data nas100d_led_data = {
94 .num_leds = ARRAY_SIZE(nas100d_led_pins),
95 .leds = nas100d_led_pins,
96 };
97
98 static struct platform_device nas100d_leds = {
99 .name = "leds-gpio",
100 .id = -1,
101 .dev.platform_data = &nas100d_led_data,
102 };
103
104 static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
105 .dev_id = "i2c-gpio.0",
106 .table = {
107 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
108 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
109 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
110 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
111 },
112 };
113
114 static struct platform_device nas100d_i2c_gpio = {
115 .name = "i2c-gpio",
116 .id = 0,
117 .dev = {
118 .platform_data = NULL,
119 },
120 };
121
122 static struct resource nas100d_uart_resources[] = {
123 {
124 .start = IXP4XX_UART1_BASE_PHYS,
125 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
126 .flags = IORESOURCE_MEM,
127 },
128 {
129 .start = IXP4XX_UART2_BASE_PHYS,
130 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
131 .flags = IORESOURCE_MEM,
132 }
133 };
134
135 static struct plat_serial8250_port nas100d_uart_data[] = {
136 {
137 .mapbase = IXP4XX_UART1_BASE_PHYS,
138 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
139 .irq = IRQ_IXP4XX_UART1,
140 .flags = UPF_BOOT_AUTOCONF,
141 .iotype = UPIO_MEM,
142 .regshift = 2,
143 .uartclk = IXP4XX_UART_XTAL,
144 },
145 {
146 .mapbase = IXP4XX_UART2_BASE_PHYS,
147 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
148 .irq = IRQ_IXP4XX_UART2,
149 .flags = UPF_BOOT_AUTOCONF,
150 .iotype = UPIO_MEM,
151 .regshift = 2,
152 .uartclk = IXP4XX_UART_XTAL,
153 },
154 { }
155 };
156
157 static struct platform_device nas100d_uart = {
158 .name = "serial8250",
159 .id = PLAT8250_DEV_PLATFORM,
160 .dev.platform_data = nas100d_uart_data,
161 .num_resources = 2,
162 .resource = nas100d_uart_resources,
163 };
164
165 /* Built-in 10/100 Ethernet MAC interfaces */
166 static struct eth_plat_info nas100d_plat_eth[] = {
167 {
168 .phy = 0,
169 .rxq = 3,
170 .txreadyq = 20,
171 }
172 };
173
174 static struct platform_device nas100d_eth[] = {
175 {
176 .name = "ixp4xx_eth",
177 .id = IXP4XX_ETH_NPEB,
178 .dev.platform_data = nas100d_plat_eth,
179 }
180 };
181
182 static struct platform_device *nas100d_devices[] __initdata = {
183 &nas100d_i2c_gpio,
184 &nas100d_flash,
185 &nas100d_leds,
186 &nas100d_eth[0],
187 };
188
nas100d_power_off(void)189 static void nas100d_power_off(void)
190 {
191 /* This causes the box to drop the power and go dead. */
192
193 /* enable the pwr cntl gpio and assert power off */
194 gpio_direction_output(NAS100D_PO_GPIO, 1);
195 }
196
197 /* This is used to make sure the power-button pusher is serious. The button
198 * must be held until the value of this counter reaches zero.
199 */
200 static int power_button_countdown;
201
202 /* Must hold the button down for at least this many counts to be processed */
203 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
204
205 static void nas100d_power_handler(struct timer_list *unused);
206 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
207
nas100d_power_handler(struct timer_list * unused)208 static void nas100d_power_handler(struct timer_list *unused)
209 {
210 /* This routine is called twice per second to check the
211 * state of the power button.
212 */
213
214 if (gpio_get_value(NAS100D_PB_GPIO)) {
215
216 /* IO Pin is 1 (button pushed) */
217 if (power_button_countdown > 0)
218 power_button_countdown--;
219
220 } else {
221
222 /* Done on button release, to allow for auto-power-on mods. */
223 if (power_button_countdown == 0) {
224 /* Signal init to do the ctrlaltdel action,
225 * this will bypass init if it hasn't started
226 * and do a kernel_restart.
227 */
228 ctrl_alt_del();
229
230 /* Change the state of the power LED to "blink" */
231 gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
232 } else {
233 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
234 }
235 }
236
237 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
238 }
239
nas100d_reset_handler(int irq,void * dev_id)240 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
241 {
242 /* This is the paper-clip reset, it shuts the machine down directly. */
243 machine_power_off();
244
245 return IRQ_HANDLED;
246 }
247
nas100d_gpio_init(void)248 static int __init nas100d_gpio_init(void)
249 {
250 if (!machine_is_nas100d())
251 return 0;
252
253 /*
254 * The power button on the Iomega NAS100d is on GPIO 14, but
255 * it cannot handle interrupts on that GPIO line. So we'll
256 * have to poll it with a kernel timer.
257 */
258
259 /* Request the power off GPIO */
260 gpio_request(NAS100D_PO_GPIO, "power off");
261
262 /* Make sure that the power button GPIO is set up as an input */
263 gpio_request(NAS100D_PB_GPIO, "power button");
264 gpio_direction_input(NAS100D_PB_GPIO);
265
266 /* Set the initial value for the power button IRQ handler */
267 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
268
269 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
270
271 return 0;
272 }
273 device_initcall(nas100d_gpio_init);
274
nas100d_init(void)275 static void __init nas100d_init(void)
276 {
277 uint8_t __iomem *f;
278 int i;
279
280 ixp4xx_sys_init();
281
282 /* gpio 14 and 15 are _not_ clocks */
283 *IXP4XX_GPIO_GPCLKR = 0;
284
285 nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
286 nas100d_flash_resource.end =
287 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
288
289 gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
290 i2c_register_board_info(0, nas100d_i2c_board_info,
291 ARRAY_SIZE(nas100d_i2c_board_info));
292
293 /*
294 * This is only useful on a modified machine, but it is valuable
295 * to have it first in order to see debug messages, and so that
296 * it does *not* get removed if platform_add_devices fails!
297 */
298 (void)platform_device_register(&nas100d_uart);
299
300 platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
301
302 pm_power_off = nas100d_power_off;
303
304 if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
305 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
306
307 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
308 gpio_to_irq(NAS100D_RB_GPIO));
309 }
310
311 /*
312 * Map in a portion of the flash and read the MAC address.
313 * Since it is stored in BE in the flash itself, we need to
314 * byteswap it if we're in LE mode.
315 */
316 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
317 if (f) {
318 for (i = 0; i < 6; i++)
319 #ifdef __ARMEB__
320 nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
321 #else
322 nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
323 #endif
324 iounmap(f);
325 }
326 printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
327 nas100d_plat_eth[0].hwaddr);
328
329 }
330
331 MACHINE_START(NAS100D, "Iomega NAS 100d")
332 /* Maintainer: www.nslu2-linux.org */
333 .atag_offset = 0x100,
334 .map_io = ixp4xx_map_io,
335 .init_early = ixp4xx_init_early,
336 .init_irq = ixp4xx_init_irq,
337 .init_time = ixp4xx_timer_init,
338 .init_machine = nas100d_init,
339 #if defined(CONFIG_PCI)
340 .dma_zone_size = SZ_64M,
341 #endif
342 .restart = ixp4xx_restart,
343 MACHINE_END
344
