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

   1 /*
   2  * Copyright (C) 2006, 2007 OpenWrt.org
   3  *
   4  * Carsten Langgaard, carstenl@mips.com
   5  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   6  *
   7  *  This program is free software; you can distribute it and/or modify it
   8  *  under the terms of the GNU General Public License (Version 2) as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope it will be useful, but WITHOUT
  12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  *  for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  19  *
  20  * Putting things on the screen/serial line using YAMONs facilities.
  21  */
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/serial_reg.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/module.h>
  27 #include <linux/string.h>
  28 #include <linux/io.h>
  29 #include <asm/bootinfo.h>
  30 #include <asm/gdb-stub.h>
  31
  32 #include <asm/ar7/ar7.h>
  33 #include <asm/ar7/prom.h>
  34
  35 #define MAX_ENTRY 80
  36
  37 struct env_var {
  38         char *name;
  39         char *value;
  40 };
  41
  42 static struct env_var adam2_env[MAX_ENTRY] = { { 0, }, };
  43
  44 char *prom_getenv(char *name)
  45 {
  46         int i;
  47         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
  48                 if (!strcmp(name, adam2_env[i].name))
  49                         return adam2_env[i].value;
  50
  51         return NULL;
  52 }
  53 EXPORT_SYMBOL(prom_getenv);
  54
  55 char * __init prom_getcmdline(void)
  56 {
  57         return &(arcs_cmdline[0]);
  58 }
  59
  60 static void  __init ar7_init_cmdline(int argc, char *argv[])
  61 {
  62         char *cp;
  63         int actr;
  64
  65         actr = 1; /* Always ignore argv[0] */
  66
  67         cp = &(arcs_cmdline[0]);
  68         while (actr < argc) {
  69                 strcpy(cp, argv[actr]);
  70                 cp += strlen(argv[actr]);
  71                 *cp++ = ' ';
  72                 actr++;
  73         }
  74         if (cp != &(arcs_cmdline[0])) {
  75                 /* get rid of trailing space */
  76                 --cp;
  77                 *cp = '\0';
  78         }
  79 }
  80
  81 struct psbl_rec {
  82         u32 psbl_size;
  83         u32 env_base;
  84         u32 env_size;
  85         u32 ffs_base;
  86         u32 ffs_size;
  87 };
  88
  89 static __initdata char psp_env_version[] = "TIENV0.8";
  90
  91 struct psp_env_chunk {
  92         u8 num;
  93         u8 ctrl;
  94         u16 csum;
  95         u8 len;
  96         char data[11];
  97 } __attribute__ ((packed));
  98
  99 struct psp_var_map_entry {
 100         u8 num;
 101         char *value;
 102 };
 103
 104 static struct psp_var_map_entry psp_var_map[] = {
 105         { 1, "cpufrequency" },
 106         { 2, "memsize" },
 107         { 3, "flashsize" },
 108         { 4, "modetty0" },
 109         { 5, "modetty1" },
 110         { 8, "maca" },
 111         { 9, "macb" },
 112         { 28, "sysfrequency" },
 113         { 38, "mipsfrequency" },
 114 };
 115
 116 /*
 117
 118 Well-known variable (num is looked up in table above for matching variable name)
 119 Example: cpufrequency=211968000
 120 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 121 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
 122 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 123
 124 Name=Value pair in a single chunk
 125 Example: NAME=VALUE
 126 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 127 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
 128 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 129
 130 Name=Value pair in 2 chunks (len is the number of chunks)
 131 Example: bootloaderVersion=1.3.7.15
 132 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 133 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
 134 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 135 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
 136 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 137
 138 Data is padded with 0xFF
 139
 140 */
 141
 142 #define PSP_ENV_SIZE  4096
 143
 144 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
 145
 146 static char * __init lookup_psp_var_map(u8 num)
 147 {
 148         int i;
 149
 150         for (i = 0; i < sizeof(psp_var_map); i++)
 151                 if (psp_var_map[i].num == num)
 152                         return psp_var_map[i].value;
 153
 154         return NULL;
 155 }
 156
 157 static void __init add_adam2_var(char *name, char *value)
 158 {
 159         int i;
 160         for (i = 0; i < MAX_ENTRY; i++) {
 161                 if (!adam2_env[i].name) {
 162                         adam2_env[i].name = name;
 163                         adam2_env[i].value = value;
 164                         return;
 165                 } else if (!strcmp(adam2_env[i].name, name)) {
 166                         adam2_env[i].value = value;
 167                         return;
 168                 }
 169         }
 170 }
 171
 172 static int __init parse_psp_env(void *psp_env_base)
 173 {
 174         int i, n;
 175         char *name, *value;
 176         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
 177
 178         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
 179
 180         i = 1;
 181         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
 182         while (i < n) {
 183                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
 184                         break;
 185                 value = chunks[i].data;
 186                 if (chunks[i].num) {
 187                         name = lookup_psp_var_map(chunks[i].num);
 188                 } else {
 189                         name = value;
 190                         value += strlen(name) + 1;
 191                 }
 192                 if (name)
 193                         add_adam2_var(name, value);
 194                 i += chunks[i].len;
 195         }
 196         return 0;
 197 }
 198
 199 static void __init ar7_init_env(struct env_var *env)
 200 {
 201         int i;
 202         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
 203         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
 204
 205         if (strcmp(psp_env, psp_env_version) == 0) {
 206                 parse_psp_env(psp_env);
 207         } else {
 208                 for (i = 0; i < MAX_ENTRY; i++, env++)
 209                         if (env->name)
 210                                 add_adam2_var(env->name, env->value);
 211         }
 212 }
 213
 214 static void __init console_config(void)
 215 {
 216 #ifdef CONFIG_SERIAL_8250_CONSOLE
 217         char console_string[40];
 218         int baud = 0;
 219         char parity = '\0', bits = '\0', flow = '\0';
 220         char *s, *p;
 221
 222         if (strstr(prom_getcmdline(), "console="))
 223                 return;
 224
 225 #ifdef CONFIG_KGDB
 226         if (!strstr(prom_getcmdline(), "nokgdb")) {
 227                 strcat(prom_getcmdline(), " console=kgdb");
 228                 kgdb_enabled = 1;
 229                 return;
 230         }
 231 #endif
 232
 233         if ((s = prom_getenv("modetty0"))) {
 234                 baud = simple_strtoul(s, &p, 10);
 235                 s = p;
 236                 if (*s == ',') s++;
 237                 if (*s) parity = *s++;
 238                 if (*s == ',') s++;
 239                 if (*s) bits = *s++;
 240                 if (*s == ',') s++;
 241                 if (*s == 'h') flow = 'r';
 242         }
 243
 244         if (baud == 0)
 245                 baud = 38400;
 246         if (parity != 'n' && parity != 'o' && parity != 'e')
 247                 parity = 'n';
 248         if (bits != '7' && bits != '8')
 249                 bits = '8';
 250         if (flow == '\0')
 251                 flow = 'r';
 252
 253         sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
 254                 parity, bits, flow);
 255         strcat(prom_getcmdline(), console_string);
 256 #endif
 257 }
 258
 259 void __init prom_init(void)
 260 {
 261         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 262         ar7_init_env((struct env_var *)fw_arg2);
 263         console_config();
 264 }
 265
 266 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
 267 static inline unsigned int serial_in(int offset)
 268 {
 269         return readb((void *)PORT(offset));
 270 }
 271
 272 static inline void serial_out(int offset, int value)
 273 {
 274         writeb(value, (void *)PORT(offset));
 275 }
 276
 277 char prom_getchar(void)
 278 {
 279         while (!(serial_in(UART_LSR) & UART_LSR_DR));
 280         return serial_in(UART_RX);
 281 }
 282
 283 int prom_putchar(char c)
 284 {
 285         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0);
 286         serial_out(UART_TX, c);
 287         return 1;
 288 }
 289
 290 /* from adm5120/prom.c */
 291 void prom_printf(char *fmt, ...)
 292 {
 293         va_list args;
 294         int l;
 295         char *p, *buf_end;
 296         char buf[1024];
 297
 298         va_start(args, fmt);
 299         l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
 300         va_end(args);
 301
 302         buf_end = buf + l;
 303
 304         for (p = buf; p < buf_end; p++) {
 305                 /* Crude cr/nl handling is better than none */
 306                 if (*p == '\n')
 307                         prom_putchar('\r');
 308                 prom_putchar(*p);
 309         }
 310 }
 311
 312 #ifdef CONFIG_KGDB
 313 int putDebugChar(char c)
 314 {
 315         return prom_putchar(c);
 316 }
 317
 318 char getDebugChar(void)
 319 {
 320        return prom_getchar();
 321 }
 322 #endif