summaryrefslogtreecommitdiffstats
path: root/arch/mips/ar7/prom.c
blob: c1fdd368281292618fa568793b0eceaf7d5b8937 (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
/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Putting things on the screen/serial line using YAMONs facilities.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/serial_reg.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/io.h>
#include <asm/bootinfo.h>

#include <asm/mach-ar7/ar7.h>
#include <asm/mach-ar7/prom.h>

#define MAX_ENTRY 80

struct env_var {
	char *name;
	char *value;
};

static struct env_var adam2_env[MAX_ENTRY];

char *prom_getenv(const char *name)
{
	int i;
	for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
		if (!strcmp(name, adam2_env[i].name))
			return adam2_env[i].value;

	return NULL;
}
EXPORT_SYMBOL(prom_getenv);

char * __init prom_getcmdline(void)
{
	return &(arcs_cmdline[0]);
}

static void  __init ar7_init_cmdline(int argc, char *argv[])
{
	char *cp;
	int actr;

	actr = 1; /* Always ignore argv[0] */

	cp = &(arcs_cmdline[0]);
	while (actr < argc) {
		strcpy(cp, argv[actr]);
		cp += strlen(argv[actr]);
		*cp++ = ' ';
		actr++;
	}
	if (cp != &(arcs_cmdline[0])) {
		/* get rid of trailing space */
		--cp;
		*cp = '\0';
	}
}

struct psbl_rec {
	u32 psbl_size;
	u32 env_base;
	u32 env_size;
	u32 ffs_base;
	u32 ffs_size;
};

static __initdata char psp_env_version[] = "TIENV0.8";

struct psp_env_chunk {
	u8 num;
	u8 ctrl;
	u16 csum;
	u8 len;
	char data[11];
} __attribute__ ((packed));

struct psp_var_map_entry {
	u8 num;
	char *value;
};

static struct psp_var_map_entry psp_var_map[] = {
	{ 1, "cpufrequency" },
	{ 2, "memsize" },
	{ 3, "flashsize" },
	{ 4, "modetty0" },
	{ 5, "modetty1" },
	{ 8, "maca" },
	{ 9, "macb" },
	{ 28, "sysfrequency" },
	{ 38, "mipsfrequency" },
};

/*

Well-known variable (num is looked up in table above for matching variable name)
Example: cpufrequency=211968000
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
| 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---

Name=Value pair in a single chunk
Example: NAME=VALUE
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
| 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---

Name=Value pair in 2 chunks (len is the number of chunks)
Example: bootloaderVersion=1.3.7.15
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
| 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
| _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---

Data is padded with 0xFF

*/

#define PSP_ENV_SIZE  4096

static char psp_env_data[PSP_ENV_SIZE] = { 0, };

static char * __init lookup_psp_var_map(u8 num)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
		if (psp_var_map[i].num == num)
			return psp_var_map[i].value;

	return NULL;
}

static void __init add_adam2_var(char *name, char *value)
{
	int i;
	for (i = 0; i < MAX_ENTRY; i++) {
		if (!adam2_env[i].name) {
			adam2_env[i].name = name;
			adam2_env[i].value = value;
			return;
		} else if (!strcmp(adam2_env[i].name, name)) {
			adam2_env[i].value = value;
			return;
		}
	}
}

static int __init parse_psp_env(void *psp_env_base)
{
	int i, n;
	char *name, *value;
	struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;

	memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);

	i = 1;
	n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
	while (i < n) {
		if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
			break;
		value = chunks[i].data;
		if (chunks[i].num) {
			name = lookup_psp_var_map(chunks[i].num);
		} else {
			name = value;
			value += strlen(name) + 1;
		}
		if (name)
			add_adam2_var(name, value);
		i += chunks[i].len;
	}
	return 0;
}

static void __init ar7_init_env(struct env_var *env)
{
	int i;
	struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
	void *psp_env = (void *)KSEG1ADDR(psbl->env_base);

	if (strcmp(psp_env, psp_env_version) == 0) {
		parse_psp_env(psp_env);
	} else {
		for (i = 0; i < MAX_ENTRY; i++, env++)
			if (env->name)
				add_adam2_var(env->name, env->value);
	}
}

static void __init console_config(void)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
	char console_string[40];
	int baud = 0;
	char parity = '\0', bits = '\0', flow = '\0';
	char *s, *p;

	if (strstr(prom_getcmdline(), "console="))
		return;

	s = prom_getenv("modetty0");
	if (s) {
		baud = simple_strtoul(s, &p, 10);
		s = p;
		if (*s == ',')
			s++;
		if (*s)
			parity = *s++;
		if (*s == ',')
			s++;
		if (*s)
			bits = *s++;
		if (*s == ',')
			s++;
		if (*s == 'h')
			flow = 'r';
	}

	if (baud == 0)
		baud = 38400;
	if (parity != 'n' && parity != 'o' && parity != 'e')
		parity = 'n';
	if (bits != '7' && bits != '8')
		bits = '8';

	if (flow == 'r')
		sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
			parity, bits, flow);
	else
		sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
			bits);
	strcat(prom_getcmdline(), console_string);
#endif
}

void __init prom_init(void)
{
	ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
	ar7_init_env((struct env_var *)fw_arg2);
	console_config();
}

#define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
static inline unsigned int serial_in(int offset)
{
	return readl((void *)PORT(offset));
}

static inline void serial_out(int offset, int value)
{
	writel(value, (void *)PORT(offset));
}

int prom_putchar(char c)
{
	while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
		;
	serial_out(UART_TX, c);
	return 1;
}