parisc: math-emu: Fix fall-through warnings
[linux-2.6-microblaze.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 #include <mach/hardware.h>
37
38 #include "irqs.h"
39
40 #define NAS100D_SDA_PIN         5
41 #define NAS100D_SCL_PIN         6
42
43 /* Buttons */
44 #define NAS100D_PB_GPIO         14   /* power button */
45 #define NAS100D_RB_GPIO         4    /* reset button */
46
47 /* Power control */
48 #define NAS100D_PO_GPIO         12   /* power off */
49
50 /* LEDs */
51 #define NAS100D_LED_WLAN_GPIO   0
52 #define NAS100D_LED_DISK_GPIO   3
53 #define NAS100D_LED_PWR_GPIO    15
54
55 static struct flash_platform_data nas100d_flash_data = {
56         .map_name               = "cfi_probe",
57         .width                  = 2,
58 };
59
60 static struct resource nas100d_flash_resource = {
61         .flags                  = IORESOURCE_MEM,
62 };
63
64 static struct platform_device nas100d_flash = {
65         .name                   = "IXP4XX-Flash",
66         .id                     = 0,
67         .dev.platform_data      = &nas100d_flash_data,
68         .num_resources          = 1,
69         .resource               = &nas100d_flash_resource,
70 };
71
72 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
73         {
74                 I2C_BOARD_INFO("pcf8563", 0x51),
75         },
76 };
77
78 static struct gpio_led nas100d_led_pins[] = {
79         {
80                 .name           = "nas100d:green:wlan",
81                 .gpio           = NAS100D_LED_WLAN_GPIO,
82                 .active_low     = true,
83         },
84         {
85                 .name           = "nas100d:blue:power",  /* (off=flashing) */
86                 .gpio           = NAS100D_LED_PWR_GPIO,
87                 .active_low     = true,
88         },
89         {
90                 .name           = "nas100d:yellow:disk",
91                 .gpio           = NAS100D_LED_DISK_GPIO,
92                 .active_low     = true,
93         },
94 };
95
96 static struct gpio_led_platform_data nas100d_led_data = {
97         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
98         .leds                   = nas100d_led_pins,
99 };
100
101 static struct platform_device nas100d_leds = {
102         .name                   = "leds-gpio",
103         .id                     = -1,
104         .dev.platform_data      = &nas100d_led_data,
105 };
106
107 static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
108         .dev_id         = "i2c-gpio.0",
109         .table          = {
110                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
111                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
112                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
113                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
114         },
115 };
116
117 static struct platform_device nas100d_i2c_gpio = {
118         .name                   = "i2c-gpio",
119         .id                     = 0,
120         .dev     = {
121                 .platform_data  = NULL,
122         },
123 };
124
125 static struct resource nas100d_uart_resources[] = {
126         {
127                 .start          = IXP4XX_UART1_BASE_PHYS,
128                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
129                 .flags          = IORESOURCE_MEM,
130         },
131         {
132                 .start          = IXP4XX_UART2_BASE_PHYS,
133                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
134                 .flags          = IORESOURCE_MEM,
135         }
136 };
137
138 static struct plat_serial8250_port nas100d_uart_data[] = {
139         {
140                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
141                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
142                 .irq            = IRQ_IXP4XX_UART1,
143                 .flags          = UPF_BOOT_AUTOCONF,
144                 .iotype         = UPIO_MEM,
145                 .regshift       = 2,
146                 .uartclk        = IXP4XX_UART_XTAL,
147         },
148         {
149                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
150                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
151                 .irq            = IRQ_IXP4XX_UART2,
152                 .flags          = UPF_BOOT_AUTOCONF,
153                 .iotype         = UPIO_MEM,
154                 .regshift       = 2,
155                 .uartclk        = IXP4XX_UART_XTAL,
156         },
157         { }
158 };
159
160 static struct platform_device nas100d_uart = {
161         .name                   = "serial8250",
162         .id                     = PLAT8250_DEV_PLATFORM,
163         .dev.platform_data      = nas100d_uart_data,
164         .num_resources          = 2,
165         .resource               = nas100d_uart_resources,
166 };
167
168 /* Built-in 10/100 Ethernet MAC interfaces */
169 static struct resource nas100d_eth_resources[] = {
170         {
171                 .start          = IXP4XX_EthB_BASE_PHYS,
172                 .end            = IXP4XX_EthB_BASE_PHYS + 0x0fff,
173                 .flags          = IORESOURCE_MEM,
174         },
175 };
176
177 static struct eth_plat_info nas100d_plat_eth[] = {
178         {
179                 .phy            = 0,
180                 .rxq            = 3,
181                 .txreadyq       = 20,
182         }
183 };
184
185 static struct platform_device nas100d_eth[] = {
186         {
187                 .name                   = "ixp4xx_eth",
188                 .id                     = IXP4XX_ETH_NPEB,
189                 .dev.platform_data      = nas100d_plat_eth,
190                 .num_resources          = ARRAY_SIZE(nas100d_eth_resources),
191                 .resource               = nas100d_eth_resources,
192         }
193 };
194
195 static struct platform_device *nas100d_devices[] __initdata = {
196         &nas100d_i2c_gpio,
197         &nas100d_flash,
198         &nas100d_leds,
199         &nas100d_eth[0],
200 };
201
202 static void nas100d_power_off(void)
203 {
204         /* This causes the box to drop the power and go dead. */
205
206         /* enable the pwr cntl gpio and assert power off */
207         gpio_direction_output(NAS100D_PO_GPIO, 1);
208 }
209
210 /* This is used to make sure the power-button pusher is serious.  The button
211  * must be held until the value of this counter reaches zero.
212  */
213 static int power_button_countdown;
214
215 /* Must hold the button down for at least this many counts to be processed */
216 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
217
218 static void nas100d_power_handler(struct timer_list *unused);
219 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
220
221 static void nas100d_power_handler(struct timer_list *unused)
222 {
223         /* This routine is called twice per second to check the
224          * state of the power button.
225          */
226
227         if (gpio_get_value(NAS100D_PB_GPIO)) {
228
229                 /* IO Pin is 1 (button pushed) */
230                 if (power_button_countdown > 0)
231                         power_button_countdown--;
232
233         } else {
234
235                 /* Done on button release, to allow for auto-power-on mods. */
236                 if (power_button_countdown == 0) {
237                         /* Signal init to do the ctrlaltdel action,
238                          * this will bypass init if it hasn't started
239                          * and do a kernel_restart.
240                          */
241                         ctrl_alt_del();
242
243                         /* Change the state of the power LED to "blink" */
244                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
245                 } else {
246                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
247                 }
248         }
249
250         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
251 }
252
253 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
254 {
255         /* This is the paper-clip reset, it shuts the machine down directly. */
256         machine_power_off();
257
258         return IRQ_HANDLED;
259 }
260
261 static int __init nas100d_gpio_init(void)
262 {
263         if (!machine_is_nas100d())
264                 return 0;
265
266         /*
267          * The power button on the Iomega NAS100d is on GPIO 14, but
268          * it cannot handle interrupts on that GPIO line.  So we'll
269          * have to poll it with a kernel timer.
270          */
271
272         /* Request the power off GPIO */
273         gpio_request(NAS100D_PO_GPIO, "power off");
274
275         /* Make sure that the power button GPIO is set up as an input */
276         gpio_request(NAS100D_PB_GPIO, "power button");
277         gpio_direction_input(NAS100D_PB_GPIO);
278
279         /* Set the initial value for the power button IRQ handler */
280         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
281
282         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
283
284         return 0;
285 }
286 device_initcall(nas100d_gpio_init);
287
288 static void __init nas100d_init(void)
289 {
290         uint8_t __iomem *f;
291         int i;
292
293         ixp4xx_sys_init();
294
295         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
296         nas100d_flash_resource.end =
297                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
298
299         gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
300         i2c_register_board_info(0, nas100d_i2c_board_info,
301                                 ARRAY_SIZE(nas100d_i2c_board_info));
302
303         /*
304          * This is only useful on a modified machine, but it is valuable
305          * to have it first in order to see debug messages, and so that
306          * it does *not* get removed if platform_add_devices fails!
307          */
308         (void)platform_device_register(&nas100d_uart);
309
310         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
311
312         pm_power_off = nas100d_power_off;
313
314         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
315                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
316
317                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
318                         gpio_to_irq(NAS100D_RB_GPIO));
319         }
320
321         /*
322          * Map in a portion of the flash and read the MAC address.
323          * Since it is stored in BE in the flash itself, we need to
324          * byteswap it if we're in LE mode.
325          */
326         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
327         if (f) {
328                 for (i = 0; i < 6; i++)
329 #ifdef __ARMEB__
330                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
331 #else
332                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
333 #endif
334                 iounmap(f);
335         }
336         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
337                nas100d_plat_eth[0].hwaddr);
338
339 }
340
341 MACHINE_START(NAS100D, "Iomega NAS 100d")
342         /* Maintainer: www.nslu2-linux.org */
343         .atag_offset    = 0x100,
344         .map_io         = ixp4xx_map_io,
345         .init_early     = ixp4xx_init_early,
346         .init_irq       = ixp4xx_init_irq,
347         .init_time      = ixp4xx_timer_init,
348         .init_machine   = nas100d_init,
349 #if defined(CONFIG_PCI)
350         .dma_zone_size  = SZ_64M,
351 #endif
352         .restart        = ixp4xx_restart,
353 MACHINE_END