Merge tag 'for-linus-5.6-1' of https://github.com/cminyard/linux-ipmi
[sfrench/cifs-2.6.git] / arch / arm / mach-ixp4xx / nas100d-setup.c
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 #include "irqs.h"
38
39 #define NAS100D_SDA_PIN         5
40 #define NAS100D_SCL_PIN         6
41
42 /* Buttons */
43 #define NAS100D_PB_GPIO         14   /* power button */
44 #define NAS100D_RB_GPIO         4    /* reset button */
45
46 /* Power control */
47 #define NAS100D_PO_GPIO         12   /* power off */
48
49 /* LEDs */
50 #define NAS100D_LED_WLAN_GPIO   0
51 #define NAS100D_LED_DISK_GPIO   3
52 #define NAS100D_LED_PWR_GPIO    15
53
54 static struct flash_platform_data nas100d_flash_data = {
55         .map_name               = "cfi_probe",
56         .width                  = 2,
57 };
58
59 static struct resource nas100d_flash_resource = {
60         .flags                  = IORESOURCE_MEM,
61 };
62
63 static struct platform_device nas100d_flash = {
64         .name                   = "IXP4XX-Flash",
65         .id                     = 0,
66         .dev.platform_data      = &nas100d_flash_data,
67         .num_resources          = 1,
68         .resource               = &nas100d_flash_resource,
69 };
70
71 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
72         {
73                 I2C_BOARD_INFO("pcf8563", 0x51),
74         },
75 };
76
77 static struct gpio_led nas100d_led_pins[] = {
78         {
79                 .name           = "nas100d:green:wlan",
80                 .gpio           = NAS100D_LED_WLAN_GPIO,
81                 .active_low     = true,
82         },
83         {
84                 .name           = "nas100d:blue:power",  /* (off=flashing) */
85                 .gpio           = NAS100D_LED_PWR_GPIO,
86                 .active_low     = true,
87         },
88         {
89                 .name           = "nas100d:yellow:disk",
90                 .gpio           = NAS100D_LED_DISK_GPIO,
91                 .active_low     = true,
92         },
93 };
94
95 static struct gpio_led_platform_data nas100d_led_data = {
96         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
97         .leds                   = nas100d_led_pins,
98 };
99
100 static struct platform_device nas100d_leds = {
101         .name                   = "leds-gpio",
102         .id                     = -1,
103         .dev.platform_data      = &nas100d_led_data,
104 };
105
106 static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
107         .dev_id         = "i2c-gpio.0",
108         .table          = {
109                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
110                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
111                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
112                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
113         },
114 };
115
116 static struct platform_device nas100d_i2c_gpio = {
117         .name                   = "i2c-gpio",
118         .id                     = 0,
119         .dev     = {
120                 .platform_data  = NULL,
121         },
122 };
123
124 static struct resource nas100d_uart_resources[] = {
125         {
126                 .start          = IXP4XX_UART1_BASE_PHYS,
127                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
128                 .flags          = IORESOURCE_MEM,
129         },
130         {
131                 .start          = IXP4XX_UART2_BASE_PHYS,
132                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
133                 .flags          = IORESOURCE_MEM,
134         }
135 };
136
137 static struct plat_serial8250_port nas100d_uart_data[] = {
138         {
139                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
140                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
141                 .irq            = IRQ_IXP4XX_UART1,
142                 .flags          = UPF_BOOT_AUTOCONF,
143                 .iotype         = UPIO_MEM,
144                 .regshift       = 2,
145                 .uartclk        = IXP4XX_UART_XTAL,
146         },
147         {
148                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
149                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
150                 .irq            = IRQ_IXP4XX_UART2,
151                 .flags          = UPF_BOOT_AUTOCONF,
152                 .iotype         = UPIO_MEM,
153                 .regshift       = 2,
154                 .uartclk        = IXP4XX_UART_XTAL,
155         },
156         { }
157 };
158
159 static struct platform_device nas100d_uart = {
160         .name                   = "serial8250",
161         .id                     = PLAT8250_DEV_PLATFORM,
162         .dev.platform_data      = nas100d_uart_data,
163         .num_resources          = 2,
164         .resource               = nas100d_uart_resources,
165 };
166
167 /* Built-in 10/100 Ethernet MAC interfaces */
168 static struct resource nas100d_eth_resources[] = {
169         {
170                 .start          = IXP4XX_EthB_BASE_PHYS,
171                 .end            = IXP4XX_EthB_BASE_PHYS + 0x0fff,
172                 .flags          = IORESOURCE_MEM,
173         },
174 };
175
176 static struct eth_plat_info nas100d_plat_eth[] = {
177         {
178                 .phy            = 0,
179                 .rxq            = 3,
180                 .txreadyq       = 20,
181         }
182 };
183
184 static struct platform_device nas100d_eth[] = {
185         {
186                 .name                   = "ixp4xx_eth",
187                 .id                     = IXP4XX_ETH_NPEB,
188                 .dev.platform_data      = nas100d_plat_eth,
189                 .num_resources          = ARRAY_SIZE(nas100d_eth_resources),
190                 .resource               = nas100d_eth_resources,
191         }
192 };
193
194 static struct platform_device *nas100d_devices[] __initdata = {
195         &nas100d_i2c_gpio,
196         &nas100d_flash,
197         &nas100d_leds,
198         &nas100d_eth[0],
199 };
200
201 static void nas100d_power_off(void)
202 {
203         /* This causes the box to drop the power and go dead. */
204
205         /* enable the pwr cntl gpio and assert power off */
206         gpio_direction_output(NAS100D_PO_GPIO, 1);
207 }
208
209 /* This is used to make sure the power-button pusher is serious.  The button
210  * must be held until the value of this counter reaches zero.
211  */
212 static int power_button_countdown;
213
214 /* Must hold the button down for at least this many counts to be processed */
215 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
216
217 static void nas100d_power_handler(struct timer_list *unused);
218 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
219
220 static void nas100d_power_handler(struct timer_list *unused)
221 {
222         /* This routine is called twice per second to check the
223          * state of the power button.
224          */
225
226         if (gpio_get_value(NAS100D_PB_GPIO)) {
227
228                 /* IO Pin is 1 (button pushed) */
229                 if (power_button_countdown > 0)
230                         power_button_countdown--;
231
232         } else {
233
234                 /* Done on button release, to allow for auto-power-on mods. */
235                 if (power_button_countdown == 0) {
236                         /* Signal init to do the ctrlaltdel action,
237                          * this will bypass init if it hasn't started
238                          * and do a kernel_restart.
239                          */
240                         ctrl_alt_del();
241
242                         /* Change the state of the power LED to "blink" */
243                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
244                 } else {
245                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
246                 }
247         }
248
249         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
250 }
251
252 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
253 {
254         /* This is the paper-clip reset, it shuts the machine down directly. */
255         machine_power_off();
256
257         return IRQ_HANDLED;
258 }
259
260 static int __init nas100d_gpio_init(void)
261 {
262         if (!machine_is_nas100d())
263                 return 0;
264
265         /*
266          * The power button on the Iomega NAS100d is on GPIO 14, but
267          * it cannot handle interrupts on that GPIO line.  So we'll
268          * have to poll it with a kernel timer.
269          */
270
271         /* Request the power off GPIO */
272         gpio_request(NAS100D_PO_GPIO, "power off");
273
274         /* Make sure that the power button GPIO is set up as an input */
275         gpio_request(NAS100D_PB_GPIO, "power button");
276         gpio_direction_input(NAS100D_PB_GPIO);
277
278         /* Set the initial value for the power button IRQ handler */
279         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
280
281         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
282
283         return 0;
284 }
285 device_initcall(nas100d_gpio_init);
286
287 static void __init nas100d_init(void)
288 {
289         uint8_t __iomem *f;
290         int i;
291
292         ixp4xx_sys_init();
293
294         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
295         nas100d_flash_resource.end =
296                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
297
298         gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
299         i2c_register_board_info(0, nas100d_i2c_board_info,
300                                 ARRAY_SIZE(nas100d_i2c_board_info));
301
302         /*
303          * This is only useful on a modified machine, but it is valuable
304          * to have it first in order to see debug messages, and so that
305          * it does *not* get removed if platform_add_devices fails!
306          */
307         (void)platform_device_register(&nas100d_uart);
308
309         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
310
311         pm_power_off = nas100d_power_off;
312
313         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
314                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
315
316                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
317                         gpio_to_irq(NAS100D_RB_GPIO));
318         }
319
320         /*
321          * Map in a portion of the flash and read the MAC address.
322          * Since it is stored in BE in the flash itself, we need to
323          * byteswap it if we're in LE mode.
324          */
325         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
326         if (f) {
327                 for (i = 0; i < 6; i++)
328 #ifdef __ARMEB__
329                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
330 #else
331                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
332 #endif
333                 iounmap(f);
334         }
335         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
336                nas100d_plat_eth[0].hwaddr);
337
338 }
339
340 MACHINE_START(NAS100D, "Iomega NAS 100d")
341         /* Maintainer: www.nslu2-linux.org */
342         .atag_offset    = 0x100,
343         .map_io         = ixp4xx_map_io,
344         .init_early     = ixp4xx_init_early,
345         .init_irq       = ixp4xx_init_irq,
346         .init_time      = ixp4xx_timer_init,
347         .init_machine   = nas100d_init,
348 #if defined(CONFIG_PCI)
349         .dma_zone_size  = SZ_64M,
350 #endif
351         .restart        = ixp4xx_restart,
352 MACHINE_END