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
54static struct flash_platform_data nas100d_flash_data = {
55	.map_name		= "cfi_probe",
56	.width			= 2,
57};
58
59static struct resource nas100d_flash_resource = {
60	.flags			= IORESOURCE_MEM,
61};
62
63static 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
71static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
72	{
73		I2C_BOARD_INFO("pcf8563", 0x51),
74	},
75};
76
77static 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
95static struct gpio_led_platform_data nas100d_led_data = {
96	.num_leds		= ARRAY_SIZE(nas100d_led_pins),
97	.leds			= nas100d_led_pins,
98};
99
100static struct platform_device nas100d_leds = {
101	.name			= "leds-gpio",
102	.id			= -1,
103	.dev.platform_data	= &nas100d_led_data,
104};
105
106static 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
116static struct platform_device nas100d_i2c_gpio = {
117	.name			= "i2c-gpio",
118	.id			= 0,
119	.dev	 = {
120		.platform_data	= NULL,
121	},
122};
123
124static 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
137static 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
159static 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 */
168static 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
176static struct eth_plat_info nas100d_plat_eth[] = {
177	{
178		.phy		= 0,
179		.rxq		= 3,
180		.txreadyq	= 20,
181	}
182};
183
184static 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
194static struct platform_device *nas100d_devices[] __initdata = {
195	&nas100d_i2c_gpio,
196	&nas100d_flash,
197	&nas100d_leds,
198	&nas100d_eth[0],
199};
200
201static 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 */
212static 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
217static void nas100d_power_handler(struct timer_list *unused);
218static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
219
220static 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
252static 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
260static 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}
285device_initcall(nas100d_gpio_init);
286
287static 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
340MACHINE_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,
352MACHINE_END
353