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/export.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
  45         for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
  46                 if (!strcmp(name, adam2_env[i].name))
  47                         return adam2_env[i].value;
  48
  49         return NULL;
  50 }
  51 EXPORT_SYMBOL(prom_getenv);
  52
  53 static void  __init ar7_init_cmdline(int argc, char *argv[])
  54 {
  55         int i;
  56
  57         for (i = 1; i < argc; i++) {
  58                 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
  59                 if (i < (argc - 1))
  60                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  61         }
  62 }
  63
  64 struct psbl_rec {
  65         u32     psbl_size;
  66         u32     env_base;
  67         u32     env_size;
  68         u32     ffs_base;
  69         u32     ffs_size;
  70 };
  71
  72 static const char psp_env_version[] __initconst = "TIENV0.8";
  73
  74 struct psp_env_chunk {
  75         u8      num;
  76         u8      ctrl;
  77         u16     csum;
  78         u8      len;
  79         char    data[11];
  80 } __packed;
  81
  82 struct psp_var_map_entry {
  83         u8      num;
  84         char    *value;
  85 };
  86
  87 static const struct psp_var_map_entry psp_var_map[] = {
  88         {  1,   "cpufrequency" },
  89         {  2,   "memsize" },
  90         {  3,   "flashsize" },
  91         {  4,   "modetty0" },
  92         {  5,   "modetty1" },
  93         {  8,   "maca" },
  94         {  9,   "macb" },
  95         { 28,   "sysfrequency" },
  96         { 38,   "mipsfrequency" },
  97 };
  98
  99 /*
 100
 101 Well-known variable (num is looked up in table above for matching variable name)
 102 Example: cpufrequency=211968000
 103 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 104 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
 105 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 106
 107 Name=Value pair in a single chunk
 108 Example: NAME=VALUE
 109 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 110 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
 111 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 112
 113 Name=Value pair in 2 chunks (len is the number of chunks)
 114 Example: bootloaderVersion=1.3.7.15
 115 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 116 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
 117 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 118 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
 119 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 120
 121 Data is padded with 0xFF
 122
 123 */
 124
 125 #define PSP_ENV_SIZE  4096
 126
 127 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
 128
 129 static char * __init lookup_psp_var_map(u8 num)
 130 {
 131         int i;
 132
 133         for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
 134                 if (psp_var_map[i].num == num)
 135                         return psp_var_map[i].value;
 136
 137         return NULL;
 138 }
 139
 140 static void __init add_adam2_var(char *name, char *value)
 141 {
 142         int i;
 143
 144         for (i = 0; i < MAX_ENTRY; i++) {
 145                 if (!adam2_env[i].name) {
 146                         adam2_env[i].name = name;
 147                         adam2_env[i].value = value;
 148                         return;
 149                 } else if (!strcmp(adam2_env[i].name, name)) {
 150                         adam2_env[i].value = value;
 151                         return;
 152                 }
 153         }
 154 }
 155
 156 static int __init parse_psp_env(void *psp_env_base)
 157 {
 158         int i, n;
 159         char *name, *value;
 160         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
 161
 162         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
 163
 164         i = 1;
 165         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
 166         while (i < n) {
 167                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
 168                         break;
 169                 value = chunks[i].data;
 170                 if (chunks[i].num) {
 171                         name = lookup_psp_var_map(chunks[i].num);
 172                 } else {
 173                         name = value;
 174                         value += strlen(name) + 1;
 175                 }
 176                 if (name)
 177                         add_adam2_var(name, value);
 178                 i += chunks[i].len;
 179         }
 180         return 0;
 181 }
 182
 183 static void __init ar7_init_env(struct env_var *env)
 184 {
 185         int i;
 186         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
 187         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
 188
 189         if (strcmp(psp_env, psp_env_version) == 0) {
 190                 parse_psp_env(psp_env);
 191         } else {
 192                 for (i = 0; i < MAX_ENTRY; i++, env++)
 193                         if (env->name)
 194                                 add_adam2_var(env->name, env->value);
 195         }
 196 }
 197
 198 static void __init console_config(void)
 199 {
 200 #ifdef CONFIG_SERIAL_8250_CONSOLE
 201         char console_string[40];
 202         int baud = 0;
 203         char parity = '\0', bits = '\0', flow = '\0';
 204         char *s, *p;
 205
 206         if (strstr(arcs_cmdline, "console="))
 207                 return;
 208
 209         s = prom_getenv("modetty0");
 210         if (s) {
 211                 baud = simple_strtoul(s, &p, 10);
 212                 s = p;
 213                 if (*s == ',')
 214                         s++;
 215                 if (*s)
 216                         parity = *s++;
 217                 if (*s == ',')
 218                         s++;
 219                 if (*s)
 220                         bits = *s++;
 221                 if (*s == ',')
 222                         s++;
 223                 if (*s == 'h')
 224                         flow = 'r';
 225         }
 226
 227         if (baud == 0)
 228                 baud = 38400;
 229         if (parity != 'n' && parity != 'o' && parity != 'e')
 230                 parity = 'n';
 231         if (bits != '7' && bits != '8')
 232                 bits = '8';
 233
 234         if (flow == 'r')
 235                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
 236                         parity, bits, flow);
 237         else
 238                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
 239                         bits);
 240         strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
 241 #endif
 242 }
 243
 244 void __init prom_init(void)
 245 {
 246         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 247         ar7_init_env((struct env_var *)fw_arg2);
 248         console_config();
 249 }
 250
 251 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
 252 static inline unsigned int serial_in(int offset)
 253 {
 254         return readl((void *)PORT(offset));
 255 }
 256
 257 static inline void serial_out(int offset, int value)
 258 {
 259         writel(value, (void *)PORT(offset));
 260 }
 261
 262 int prom_putchar(char c)
 263 {
 264         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
 265                 ;
 266         serial_out(UART_TX, c);
 267         return 1;
 268 }