summaryrefslogtreecommitdiffstats
path: root/arch/arm/boards/raspberry-pi/rpi-common.c
blob: 0e17587a74ef8ef3c090102e1a8db987e479741e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
 * Copyright (C) 2009 Carlo Caione <carlo@carlocaione.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <init.h>
#include <fs.h>
#include <linux/stat.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <envfs.h>
#include <malloc.h>
#include <gpio.h>
#include <net.h>
#include <led.h>
#include <asm/armlinux.h>
#include <generated/mach-types.h>

#include <mach/core.h>
#include <mach/mbox.h>

#include "rpi.h"

struct msg_get_arm_mem {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
	u32 end_tag;
};

struct msg_get_clock_rate {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
	u32 end_tag;
};

struct msg_get_board_rev {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_get_board_rev get_board_rev;
	u32 end_tag;
};

struct msg_get_mac_address {
	struct bcm2835_mbox_hdr hdr;
	struct bcm2835_mbox_tag_get_mac_address get_mac_address;
	u32 end_tag;
};

static int rpi_get_arm_mem(u32 *size)
{
	BCM2835_MBOX_STACK_ALIGN(struct msg_get_arm_mem, msg);
	int ret;

	BCM2835_MBOX_INIT_HDR(msg);
	BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);

	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
	if (ret)
		return ret;

	*size = msg->get_arm_mem.body.resp.mem_size;

	return 0;
}

static int rpi_register_clkdev(u32 clock_id, const char *name)
{
	BCM2835_MBOX_STACK_ALIGN(struct msg_get_clock_rate, msg);
	struct clk *clk;
	int ret;

	BCM2835_MBOX_INIT_HDR(msg);
	BCM2835_MBOX_INIT_TAG(&msg->get_clock_rate, GET_CLOCK_RATE);
	msg->get_clock_rate.body.req.clock_id = clock_id;

	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
	if (ret)
		return ret;

	clk = clk_fixed(name, msg->get_clock_rate.body.resp.rate_hz);
	if (IS_ERR(clk))
		return PTR_ERR(clk);

	if (!clk_register_clkdev(clk, NULL, name))
		return -ENODEV;

	return 0;
}

void rpi_set_usbethaddr(void)
{
	BCM2835_MBOX_STACK_ALIGN(struct msg_get_mac_address, msg);
	int ret;

	BCM2835_MBOX_INIT_HDR(msg);
	BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);

	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
	if (ret) {
		printf("bcm2835: Could not query MAC address\n");
		/* Ignore error; not critical */
		return;
	}

	eth_register_ethaddr(0, msg->get_mac_address.body.resp.mac);
}

struct gpio_led rpi_leds[] = {
	{
		.gpio	= -EINVAL,
		.led	= {
			.name = "ACT",
		},
	}, {
		.gpio	= -EINVAL,
		.led	= {
			.name = "PWR",
		},
	},
};

void rpi_add_led(void)
{
	int i;
	struct gpio_led *l;

	for (i = 0; i < ARRAY_SIZE(rpi_leds); i++) {
		l = &rpi_leds[i];

		if (gpio_is_valid(l->gpio))
			led_gpio_register(l);
	}

	l = &rpi_leds[0];
	if (gpio_is_valid(l->gpio))
		led_set_trigger(LED_TRIGGER_HEARTBEAT, &l->led);
}

void rpi_b_plus_init(void)
{
	rpi_leds[0].gpio = 47;
	rpi_leds[1].gpio = 35;
	rpi_set_usbethaddr();
}

static int rpi_board_rev = 0;

static void rpi_get_board_rev(void)
{
	int ret;
	char *name;

	BCM2835_MBOX_STACK_ALIGN(struct msg_get_board_rev, msg);
	BCM2835_MBOX_INIT_HDR(msg);
	BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);

	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
	if (ret) {
		printf("bcm2835: Could not query board revision\n");
		/* Ignore error; not critical */
		return;
	}

	/* Comments from u-boot:
	 * For details of old-vs-new scheme, see:
	 * https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
	 * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
	 * (a few posts down)
	 *
	 * For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
	 * lower byte to use as the board rev:
	 * http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
	 * http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
	 */
	rpi_board_rev = msg->get_board_rev.body.resp.rev;
	if (rpi_board_rev & 0x800000)
		rpi_board_rev = (rpi_board_rev >> 4) & 0xff;
	else
		rpi_board_rev &= 0xff;
	if (rpi_board_rev >= rpi_models_size) {
		printf("RPI: Board rev %u outside known range\n",
		       rpi_board_rev);
		goto unknown_rev;
	}

	if (!rpi_models[rpi_board_rev].name) {
		printf("RPI: Board rev %u unknown\n", rpi_board_rev);
		goto unknown_rev;
	}

	if (!rpi_board_rev)
		goto unknown_rev;

	name = asprintf("RaspberryPi %s %s", rpi_models[rpi_board_rev].name,
			rpi_model_string);
	barebox_set_model(name);
	free(name);

	return;

unknown_rev:
	rpi_board_rev = 0;
	name = asprintf("RaspberryPi %s", rpi_model_string);
	barebox_set_model(name);
	free(name);
}

static void rpi_model_init(void)
{
	if (!rpi_models[rpi_board_rev].init)
		return;

	rpi_models[rpi_board_rev].init();
	rpi_add_led();
}

static int rpi_mem_init(void)
{
	u32 size = 0;
	int ret;

	ret = rpi_get_arm_mem(&size);
	if (ret)
		printf("could not query ARM memory size\n");

	bcm2835_add_device_sdram(size);

	return ret;
}
mem_initcall(rpi_mem_init);

static int rpi_console_init(void)
{
	rpi_get_board_rev();
	barebox_set_hostname("rpi");

	bcm2835_register_uart();
	return 0;
}
console_initcall(rpi_console_init);

static int rpi_clock_init(void)
{
	rpi_register_clkdev(BCM2835_MBOX_CLOCK_ID_EMMC, "bcm2835_mci0");
	return 0;
}
postconsole_initcall(rpi_clock_init);

static int rpi_env_init(void)
{
	struct stat s;
	const char *diskdev = "/dev/disk0.0";
	int ret;

	device_detect_by_name("mci0");

	ret = stat(diskdev, &s);
	if (ret) {
		printf("no %s. using default env\n", diskdev);
		return 0;
	}

	mkdir("/boot", 0666);
	ret = mount(diskdev, "fat", "/boot", NULL);
	if (ret) {
		printf("failed to mount %s\n", diskdev);
		return 0;
	}

	default_environment_path_set("/boot/barebox.env");

	return 0;
}

static int rpi_devices_init(void)
{
	rpi_model_init();
	bcm2835_register_mci();
	bcm2835_register_fb();
	armlinux_set_architecture(MACH_TYPE_BCM2708);
	rpi_env_init();
	return 0;
}
late_initcall(rpi_devices_init);