4 * Copyright (C) 2006, 2007 OpenWrt.org
6 * Carsten Langgaard, carstenl@mips.com
7 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
9 * This program is free software; you can distribute it and/or modify it
10 * under the terms of the GNU General Public License (Version 2) as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 * Putting things on the screen/serial line using YAMONs facilities.
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/serial_reg.h>
27 #include <linux/spinlock.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
31 #include <asm/bootinfo.h>
32 #include <asm/mips-boards/prom.h>
33 #include <asm/gdb-stub.h>
35 #include <asm/ar7/ar7.h>
36 #include <asm/ar7/prom.h>
45 static struct env_var adam2_env[MAX_ENTRY] = { { 0, }, };
47 char * prom_getenv(char *name)
50 for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
51 if (!strcmp(name, adam2_env[i].name))
52 return adam2_env[i].value;
57 char * __init prom_getcmdline(void)
59 return &(arcs_cmdline[0]);
62 static void __init ar7_init_cmdline(int argc, char *argv[])
67 actr = 1; /* Always ignore argv[0] */
69 cp = &(arcs_cmdline[0]);
71 strcpy(cp, argv[actr]);
72 cp += strlen(argv[actr]);
76 if (cp != &(arcs_cmdline[0])) {
77 /* get rid of trailing space */
91 static __initdata char psp_env_version[] = "TIENV0.8";
93 struct psp_env_chunk {
99 } __attribute__ ((packed));
101 struct psp_var_map_entry {
106 static struct psp_var_map_entry psp_var_map[] = {
107 { 1, "cpufrequency" },
114 { 28, "sysfrequency" },
115 { 38, "mipsfrequency" },
120 Well-known variable (num is looked up in table above for matching variable name)
121 Example: cpufrequency=211968000
122 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
123 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF |
124 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
126 Name=Value pair in a single chunk
128 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
129 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0 |
130 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
132 Name=Value pair in 2 chunks (len is the number of chunks)
133 Example: bootloaderVersion=1.3.7.15
134 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
135 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V |
136 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
137 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0 |
138 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
140 Data is padded with 0xFF
144 #define PSP_ENV_SIZE 4096
146 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
148 static char * __init lookup_psp_var_map(u8 num)
152 for (i = 0; i < sizeof(psp_var_map); i++)
153 if (psp_var_map[i].num == num)
154 return psp_var_map[i].value;
159 static void __init add_adam2_var(char *name, char *value)
162 for (i = 0; i < MAX_ENTRY; i++) {
163 if (!adam2_env[i].name) {
164 adam2_env[i].name = name;
165 adam2_env[i].value = value;
167 } else if (!strcmp(adam2_env[i].name, name)) {
168 adam2_env[i].value = value;
174 static int __init parse_psp_env(void *psp_env_base)
178 struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
180 memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
183 n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
185 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
187 value = chunks[i].data;
189 name = lookup_psp_var_map(chunks[i].num);
192 value += strlen(name) + 1;
195 add_adam2_var(name, value);
201 static void __init ar7_init_env(struct env_var *env)
204 struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
205 void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
207 if(strcmp(psp_env, psp_env_version) == 0) {
208 parse_psp_env(psp_env);
210 for (i = 0; i < MAX_ENTRY; i++, env++)
212 add_adam2_var(env->name, env->value);
216 static void __init console_config(void)
218 #ifdef CONFIG_SERIAL_8250_CONSOLE
219 char console_string[40];
221 char parity = '\0', bits = '\0', flow = '\0';
224 if (strstr(prom_getcmdline(), "console="))
228 if (!strstr(prom_getcmdline(), "nokgdb"))
230 strcat(prom_getcmdline(), " console=kgdb");
236 if ((s = prom_getenv("modetty0"))) {
237 baud = simple_strtoul(s, &p, 10);
240 if (*s) parity = *s++;
244 if (*s == 'h') flow = 'r';
249 if (parity != 'n' && parity != 'o' && parity != 'e')
251 if (bits != '7' && bits != '8')
256 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
258 strcat(prom_getcmdline(), console_string);
262 void __init prom_init(void)
264 ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
265 ar7_init_env((struct env_var *)fw_arg2);
269 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
270 static inline unsigned int serial_in(int offset)
272 return readb((void *)PORT(offset));
275 static inline void serial_out(int offset, int value)
277 writeb(value, (void *)PORT(offset));
280 char prom_getchar(void)
282 while (!(serial_in(UART_LSR) & UART_LSR_DR));
283 return serial_in(UART_RX);
286 int prom_putchar(char c)
288 while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0);
289 serial_out(UART_TX, c);
293 // from adm5120/prom.c
294 void prom_printf(char *fmt, ...)
302 l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
307 for (p = buf; p < buf_end; p++) {
308 /* Crude cr/nl handling is better than none */
316 int putDebugChar(char c)
318 return prom_putchar(c);
321 char getDebugChar(void)
323 return prom_getchar();
327 EXPORT_SYMBOL(prom_getenv);