2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 * Putting things on the screen/serial line using YAMONs facilities.
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/serial_reg.h>
23 #include <linux/spinlock.h>
24 #include <linux/export.h>
25 #include <linux/string.h>
27 #include <asm/bootinfo.h>
28 #include <asm/setup.h>
30 #include <asm/mach-ar7/ar7.h>
31 #include <asm/mach-ar7/prom.h>
40 static struct env_var adam2_env[MAX_ENTRY];
42 char *prom_getenv(const char *name)
46 for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
47 if (!strcmp(name, adam2_env[i].name))
48 return adam2_env[i].value;
52 EXPORT_SYMBOL(prom_getenv);
54 static void __init ar7_init_cmdline(int argc, char *argv[])
58 for (i = 1; i < argc; i++) {
59 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
61 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
73 static const char psp_env_version[] __initconst = "TIENV0.8";
75 struct psp_env_chunk {
83 struct psp_var_map_entry {
88 static const struct psp_var_map_entry psp_var_map[] = {
89 { 1, "cpufrequency" },
96 { 28, "sysfrequency" },
97 { 38, "mipsfrequency" },
102 Well-known variable (num is looked up in table above for matching variable name)
103 Example: cpufrequency=211968000
104 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
105 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
106 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
108 Name=Value pair in a single chunk
110 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
111 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
112 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
114 Name=Value pair in 2 chunks (len is the number of chunks)
115 Example: bootloaderVersion=1.3.7.15
116 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
117 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
118 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
119 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
120 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
122 Data is padded with 0xFF
126 #define PSP_ENV_SIZE 4096
128 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
130 static char * __init lookup_psp_var_map(u8 num)
134 for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
135 if (psp_var_map[i].num == num)
136 return psp_var_map[i].value;
141 static void __init add_adam2_var(char *name, char *value)
145 for (i = 0; i < MAX_ENTRY; i++) {
146 if (!adam2_env[i].name) {
147 adam2_env[i].name = name;
148 adam2_env[i].value = value;
150 } else if (!strcmp(adam2_env[i].name, name)) {
151 adam2_env[i].value = value;
157 static int __init parse_psp_env(void *psp_env_base)
161 struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
163 memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
166 n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
168 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
170 value = chunks[i].data;
172 name = lookup_psp_var_map(chunks[i].num);
175 value += strlen(name) + 1;
178 add_adam2_var(name, value);
184 static void __init ar7_init_env(struct env_var *env)
187 struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
188 void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
190 if (strcmp(psp_env, psp_env_version) == 0) {
191 parse_psp_env(psp_env);
193 for (i = 0; i < MAX_ENTRY; i++, env++)
195 add_adam2_var(env->name, env->value);
199 static void __init console_config(void)
201 #ifdef CONFIG_SERIAL_8250_CONSOLE
202 char console_string[40];
204 char parity = '\0', bits = '\0', flow = '\0';
207 if (strstr(arcs_cmdline, "console="))
210 s = prom_getenv("modetty0");
212 baud = simple_strtoul(s, &p, 10);
230 if (parity != 'n' && parity != 'o' && parity != 'e')
232 if (bits != '7' && bits != '8')
236 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
239 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
241 strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
245 void __init prom_init(void)
247 ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
248 ar7_init_env((struct env_var *)fw_arg2);
252 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
253 static inline unsigned int serial_in(int offset)
255 return readl((void *)PORT(offset));
258 static inline void serial_out(int offset, int value)
260 writel(value, (void *)PORT(offset));
263 void prom_putchar(char c)
265 while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
267 serial_out(UART_TX, c);