arch/mips/ar7/prom.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   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.
   8  *
   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
  12  *  for more details.
  13  *
  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.
  17  *
  18  * Putting things on the screen/serial line using YAMONs facilities.
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/io.h>
  27 #include <asm/bootinfo.h>
  28
  29 #include <asm/mach-ar7/ar7.h>
  30 #include <asm/mach-ar7/prom.h>
  31
  32 #define MAX_ENTRY 80
  33
  34 struct env_var {
  35         char *name;
  36         char *value;
  37 };
  38
  39 static struct env_var adam2_env[MAX_ENTRY];
  40
  41 char *prom_getenv(const char *name)
  42 {
  43         int i;
  44         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
  45                 if (!strcmp(name, adam2_env[i].name))
  46                         return adam2_env[i].value;
  47
  48         return NULL;
  49 }
  50 EXPORT_SYMBOL(prom_getenv);
  51
  52 char * __init prom_getcmdline(void)
  53 {
  54         return &(arcs_cmdline[0]);
  55 }
  56
  57 static void  __init ar7_init_cmdline(int argc, char *argv[])
  58 {
  59         char *cp;
  60         int actr;
  61
  62         actr = 1; /* Always ignore argv[0] */
  63
  64         cp = &(arcs_cmdline[0]);
  65         while (actr < argc) {
  66                 strcpy(cp, argv[actr]);
  67                 cp += strlen(argv[actr]);
  68                 *cp++ = ' ';
  69                 actr++;
  70         }
  71         if (cp != &(arcs_cmdline[0])) {
  72                 /* get rid of trailing space */
  73                 --cp;
  74                 *cp = '\0';
  75         }
  76 }
  77
  78 struct psbl_rec {
  79         u32 psbl_size;
  80         u32 env_base;
  81         u32 env_size;
  82         u32 ffs_base;
  83         u32 ffs_size;
  84 };
  85
  86 static __initdata char psp_env_version[] = "TIENV0.8";
  87
  88 struct psp_env_chunk {
  89         u8 num;
  90         u8 ctrl;
  91         u16 csum;
  92         u8 len;
  93         char data[11];
  94 } __attribute__ ((packed));
  95
  96 struct psp_var_map_entry {
  97         u8 num;
  98         char *value;
  99 };
 100
 101 static struct psp_var_map_entry psp_var_map[] = {
 102         { 1, "cpufrequency" },
 103         { 2, "memsize" },
 104         { 3, "flashsize" },
 105         { 4, "modetty0" },
 106         { 5, "modetty1" },
 107         { 8, "maca" },
 108         { 9, "macb" },
 109         { 28, "sysfrequency" },
 110         { 38, "mipsfrequency" },
 111 };
 112
 113 /*
 114
 115 Well-known variable (num is looked up in table above for matching variable name)
 116 Example: cpufrequency=211968000
 117 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 118 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
 119 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 120
 121 Name=Value pair in a single chunk
 122 Example: NAME=VALUE
 123 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 124 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
 125 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 126
 127 Name=Value pair in 2 chunks (len is the number of chunks)
 128 Example: bootloaderVersion=1.3.7.15
 129 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 130 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
 131 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 132 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
 133 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 134
 135 Data is padded with 0xFF
 136
 137 */
 138
 139 #define PSP_ENV_SIZE  4096
 140
 141 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
 142
 143 static char * __init lookup_psp_var_map(u8 num)
 144 {
 145         int i;
 146
 147         for (i = 0; i < sizeof(psp_var_map); i++)
 148                 if (psp_var_map[i].num == num)
 149                         return psp_var_map[i].value;
 150
 151         return NULL;
 152 }
 153
 154 static void __init add_adam2_var(char *name, char *value)
 155 {
 156         int i;
 157         for (i = 0; i < MAX_ENTRY; i++) {
 158                 if (!adam2_env[i].name) {
 159                         adam2_env[i].name = name;
 160                         adam2_env[i].value = value;
 161                         return;
 162                 } else if (!strcmp(adam2_env[i].name, name)) {
 163                         adam2_env[i].value = value;
 164                         return;
 165                 }
 166         }
 167 }
 168
 169 static int __init parse_psp_env(void *psp_env_base)
 170 {
 171         int i, n;
 172         char *name, *value;
 173         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
 174
 175         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
 176
 177         i = 1;
 178         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
 179         while (i < n) {
 180                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
 181                         break;
 182                 value = chunks[i].data;
 183                 if (chunks[i].num) {
 184                         name = lookup_psp_var_map(chunks[i].num);
 185                 } else {
 186                         name = value;
 187                         value += strlen(name) + 1;
 188                 }
 189                 if (name)
 190                         add_adam2_var(name, value);
 191                 i += chunks[i].len;
 192         }
 193         return 0;
 194 }
 195
 196 static void __init ar7_init_env(struct env_var *env)
 197 {
 198         int i;
 199         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
 200         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
 201
 202         if (strcmp(psp_env, psp_env_version) == 0) {
 203                 parse_psp_env(psp_env);
 204         } else {
 205                 for (i = 0; i < MAX_ENTRY; i++, env++)
 206                         if (env->name)
 207                                 add_adam2_var(env->name, env->value);
 208         }
 209 }
 210
 211 static void __init console_config(void)
 212 {
 213 #ifdef CONFIG_SERIAL_8250_CONSOLE
 214         char console_string[40];
 215         int baud = 0;
 216         char parity = '\0', bits = '\0', flow = '\0';
 217         char *s, *p;
 218
 219         if (strstr(prom_getcmdline(), "console="))
 220                 return;
 221
 222 #ifdef CONFIG_KGDB
 223         if (!strstr(prom_getcmdline(), "nokgdb")) {
 224                 strcat(prom_getcmdline(), " console=kgdb");
 225                 kgdb_enabled = 1;
 226                 return;
 227         }
 228 #endif
 229
 230         s = prom_getenv("modetty0");
 231         if (s) {
 232                 baud = simple_strtoul(s, &p, 10);
 233                 s = p;
 234                 if (*s == ',')
 235                         s++;
 236                 if (*s)
 237                         parity = *s++;
 238                 if (*s == ',')
 239                         s++;
 240                 if (*s)
 241                         bits = *s++;
 242                 if (*s == ',')
 243                         s++;
 244                 if (*s == 'h')
 245                         flow = 'r';
 246         }
 247
 248         if (baud == 0)
 249                 baud = 38400;
 250         if (parity != 'n' && parity != 'o' && parity != 'e')
 251                 parity = 'n';
 252         if (bits != '7' && bits != '8')
 253                 bits = '8';
 254
 255         if (flow == 'r')
 256                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
 257                         parity, bits, flow);
 258         else
 259                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
 260                         bits);
 261         strcat(prom_getcmdline(), console_string);
 262 #endif
 263 }
 264
 265 void __init prom_init(void)
 266 {
 267         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 268         ar7_init_env((struct env_var *)fw_arg2);
 269         console_config();
 270 }
 271
 272 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
 273 static inline unsigned int serial_in(int offset)
 274 {
 275         return readl((void *)PORT(offset));
 276 }
 277
 278 static inline void serial_out(int offset, int value)
 279 {
 280         writel(value, (void *)PORT(offset));
 281 }
 282
 283 char prom_getchar(void)
 284 {
 285         while (!(serial_in(UART_LSR) & UART_LSR_DR))
 286                 ;
 287         return serial_in(UART_RX);
 288 }
 289
 290 int prom_putchar(char c)
 291 {
 292         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
 293                 ;
 294         serial_out(UART_TX, c);
 295         return 1;
 296 }
 297