target/linux/ar7-2.6/files/arch/mips/ar7/prom.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2006, 2007 OpenWrt.org
   5  *
   6  * Carsten Langgaard, carstenl@mips.com
   7  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   8  *
   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.
  12  *
  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
  16  *  for more details.
  17  *
  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.
  21  *
  22  * Putting things on the screen/serial line using YAMONs facilities.
  23  */
  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>
  30 #include <asm/io.h>
  31 #include <asm/bootinfo.h>
  32 #include <asm/mips-boards/prom.h>
  33 #include <asm/gdb-stub.h>
  34
  35 #include <asm/ar7/ar7.h>
  36 #include <asm/ar7/prom.h>
  37
  38 #define MAX_ENTRY 80
  39
  40 struct env_var {
  41         char *name;
  42         char *value;
  43 };
  44
  45 static struct env_var adam2_env[MAX_ENTRY] = { { 0, }, };
  46
  47 char * prom_getenv(char *name)
  48 {
  49         int i;
  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;
  53
  54         return NULL;
  55 }
  56
  57 char * __init prom_getcmdline(void)
  58 {
  59         return &(arcs_cmdline[0]);
  60 }
  61
  62 static void  __init ar7_init_cmdline(int argc, char *argv[])
  63 {
  64         char *cp;
  65         int actr;
  66
  67         actr = 1; /* Always ignore argv[0] */
  68
  69         cp = &(arcs_cmdline[0]);
  70         while(actr < argc) {
  71                 strcpy(cp, argv[actr]);
  72                 cp += strlen(argv[actr]);
  73                 *cp++ = ' ';
  74                 actr++;
  75         }
  76         if (cp != &(arcs_cmdline[0])) {
  77                 /* get rid of trailing space */
  78                 --cp;
  79                 *cp = '\0';
  80         }
  81 }
  82
  83 struct psbl_rec {
  84         u32 psbl_size;
  85         u32 env_base;
  86         u32 env_size;
  87         u32 ffs_base;
  88         u32 ffs_size;
  89 };
  90
  91 static __initdata char psp_env_version[] = "TIENV0.8";
  92
  93 struct psp_env_chunk {
  94         u8 num;
  95         u8 ctrl;
  96         u16 csum;
  97         u8 len;
  98         char data[11];
  99 } __attribute__ ((packed));
 100
 101 struct psp_var_map_entry {
 102         u8 num;
 103         char *value;
 104 };
 105
 106 static struct psp_var_map_entry psp_var_map[] = {
 107         { 1, "cpufrequency" },
 108         { 2, "memsize" },
 109         { 3, "flashsize" },
 110         { 4, "modetty0" },
 111         { 5, "modetty1" },
 112         { 8, "maca" },
 113         { 9, "macb" },
 114         { 28, "sysfrequency" },
 115         { 38, "mipsfrequency" },
 116 };
 117
 118 /*
 119
 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 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 125
 126 Name=Value pair in a single chunk
 127 Example: NAME=VALUE
 128 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 129 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0 |
 130 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 131
 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 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 139
 140 Data is padded with 0xFF
 141
 142 */
 143
 144 #define PSP_ENV_SIZE  4096
 145
 146 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
 147
 148 static char * __init lookup_psp_var_map(u8 num)
 149 {
 150         int i;
 151
 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;
 155
 156         return NULL;
 157 }
 158
 159 static void __init add_adam2_var(char *name, char *value)
 160 {
 161         int i;
 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;
 166                         return;
 167                 } else if (!strcmp(adam2_env[i].name, name)) {
 168                         adam2_env[i].value = value;
 169                         return;
 170                 }
 171         }
 172 }
 173
 174 static int __init parse_psp_env(void *psp_env_base)
 175 {
 176         int i, n;
 177         char *name, *value;
 178         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
 179
 180         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
 181
 182         i = 1;
 183         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
 184         while (i < n) {
 185                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
 186                         break;
 187                 value = chunks[i].data;
 188                 if (chunks[i].num) {
 189                         name = lookup_psp_var_map(chunks[i].num);
 190                 } else {
 191                         name = value;
 192                         value += strlen(name) + 1;
 193                 }
 194                 if (name)
 195                         add_adam2_var(name, value);
 196                 i += chunks[i].len;
 197         }
 198         return 0;
 199 }
 200
 201 static void __init ar7_init_env(struct env_var *env)
 202 {
 203         int i;
 204         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
 205         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
 206
 207         if(strcmp(psp_env, psp_env_version) == 0) {
 208                 parse_psp_env(psp_env);
 209         } else {
 210                 for (i = 0; i < MAX_ENTRY; i++, env++)
 211                         if (env->name)
 212                                 add_adam2_var(env->name, env->value);
 213         }
 214 }
 215
 216 static void __init console_config(void)
 217 {
 218 #ifdef CONFIG_SERIAL_8250_CONSOLE
 219         char console_string[40];
 220         int baud = 0;
 221         char parity = '\0', bits = '\0', flow = '\0';
 222         char *s, *p;
 223
 224         if (strstr(prom_getcmdline(), "console="))
 225                 return;
 226
 227 #ifdef CONFIG_KGDB
 228         if (!strstr(prom_getcmdline(), "nokgdb"))
 229         {
 230             strcat(prom_getcmdline(), " console=kgdb");
 231             kgdb_enabled = 1;
 232             return;
 233         }
 234 #endif
 235
 236         if ((s = prom_getenv("modetty0"))) {
 237                 baud = simple_strtoul(s, &p, 10);
 238                 s = p;
 239                 if (*s == ',') s++;
 240                 if (*s) parity = *s++;
 241                 if (*s == ',') s++;
 242                 if (*s) bits = *s++;
 243                 if (*s == ',') s++;
 244                 if (*s == 'h') flow = 'r';
 245         }
 246
 247         if (baud == 0)
 248                 baud = 38400;
 249         if (parity != 'n' && parity != 'o' && parity != 'e')
 250                 parity = 'n';
 251         if (bits != '7' && bits != '8')
 252                 bits = '8';
 253         if (flow == '\0')
 254                 flow = 'r';
 255
 256         sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
 257                 parity, bits, flow);
 258         strcat(prom_getcmdline(), console_string);
 259 #endif
 260 }
 261
 262 void __init prom_init(void)
 263 {
 264         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 265         ar7_init_env((struct env_var *)fw_arg2);
 266         console_config();
 267 }
 268
 269 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
 270 static inline unsigned int serial_in(int offset)
 271 {
 272         return readb((void *)PORT(offset));
 273 }
 274
 275 static inline void serial_out(int offset, int value)
 276 {
 277         writeb(value, (void *)PORT(offset));
 278 }
 279
 280 char prom_getchar(void)
 281 {
 282         while (!(serial_in(UART_LSR) & UART_LSR_DR));
 283         return serial_in(UART_RX);
 284 }
 285
 286 int prom_putchar(char c)
 287 {
 288         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0);
 289         serial_out(UART_TX, c);
 290         return 1;
 291 }
 292
 293 // from adm5120/prom.c
 294 void prom_printf(char *fmt, ...)
 295 {
 296     va_list args;
 297     int l;
 298     char *p, *buf_end;
 299     char buf[1024];
 300
 301     va_start(args, fmt);
 302     l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
 303     va_end(args);
 304
 305     buf_end = buf + l;
 306
 307     for (p = buf; p < buf_end; p++) {
 308         /* Crude cr/nl handling is better than none */
 309         if (*p == '\n')
 310             prom_putchar('\r');
 311         prom_putchar(*p);
 312     }
 313 }
 314
 315 #ifdef CONFIG_KGDB
 316 int putDebugChar(char c)
 317 {
 318         return prom_putchar(c);
 319 }
 320
 321 char getDebugChar(void)
 322 {
 323        return prom_getchar();
 324 }
 325 #endif
 326
 327 EXPORT_SYMBOL(prom_getenv);