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         int i;
  60
  61         for (i = 1; i < argc; i++) {
  62                 strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
  63                 if (i < (argc - 1))
  64                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  65         }
  66 }
  67
  68 struct psbl_rec {
  69         u32 psbl_size;
  70         u32 env_base;
  71         u32 env_size;
  72         u32 ffs_base;
  73         u32 ffs_size;
  74 };
  75
  76 static __initdata char psp_env_version[] = "TIENV0.8";
  77
  78 struct psp_env_chunk {
  79         u8 num;
  80         u8 ctrl;
  81         u16 csum;
  82         u8 len;
  83         char data[11];
  84 } __attribute__ ((packed));
  85
  86 struct psp_var_map_entry {
  87         u8 num;
  88         char *value;
  89 };
  90
  91 static struct psp_var_map_entry psp_var_map[] = {
  92         { 1, "cpufrequency" },
  93         { 2, "memsize" },
  94         { 3, "flashsize" },
  95         { 4, "modetty0" },
  96         { 5, "modetty1" },
  97         { 8, "maca" },
  98         { 9, "macb" },
  99         { 28, "sysfrequency" },
 100         { 38, "mipsfrequency" },
 101 };
 102
 103 /*
 104
 105 Well-known variable (num is looked up in table above for matching variable name)
 106 Example: cpufrequency=211968000
 107 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 108 | 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
 109 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 110
 111 Name=Value pair in a single chunk
 112 Example: NAME=VALUE
 113 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 114 | 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
 115 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 116
 117 Name=Value pair in 2 chunks (len is the number of chunks)
 118 Example: bootloaderVersion=1.3.7.15
 119 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 120 | 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
 121 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 122 | _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
 123 +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
 124
 125 Data is padded with 0xFF
 126
 127 */
 128
 129 #define PSP_ENV_SIZE  4096
 130
 131 static char psp_env_data[PSP_ENV_SIZE] = { 0, };
 132
 133 static char * __init lookup_psp_var_map(u8 num)
 134 {
 135         int i;
 136
 137         for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
 138                 if (psp_var_map[i].num == num)
 139                         return psp_var_map[i].value;
 140
 141         return NULL;
 142 }
 143
 144 static void __init add_adam2_var(char *name, char *value)
 145 {
 146         int i;
 147         for (i = 0; i < MAX_ENTRY; i++) {
 148                 if (!adam2_env[i].name) {
 149                         adam2_env[i].name = name;
 150                         adam2_env[i].value = value;
 151                         return;
 152                 } else if (!strcmp(adam2_env[i].name, name)) {
 153                         adam2_env[i].value = value;
 154                         return;
 155                 }
 156         }
 157 }
 158
 159 static int __init parse_psp_env(void *psp_env_base)
 160 {
 161         int i, n;
 162         char *name, *value;
 163         struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
 164
 165         memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
 166
 167         i = 1;
 168         n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
 169         while (i < n) {
 170                 if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
 171                         break;
 172                 value = chunks[i].data;
 173                 if (chunks[i].num) {
 174                         name = lookup_psp_var_map(chunks[i].num);
 175                 } else {
 176                         name = value;
 177                         value += strlen(name) + 1;
 178                 }
 179                 if (name)
 180                         add_adam2_var(name, value);
 181                 i += chunks[i].len;
 182         }
 183         return 0;
 184 }
 185
 186 static void __init ar7_init_env(struct env_var *env)
 187 {
 188         int i;
 189         struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
 190         void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
 191
 192         if (strcmp(psp_env, psp_env_version) == 0) {
 193                 parse_psp_env(psp_env);
 194         } else {
 195                 for (i = 0; i < MAX_ENTRY; i++, env++)
 196                         if (env->name)
 197                                 add_adam2_var(env->name, env->value);
 198         }
 199 }
 200
 201 static void __init console_config(void)
 202 {
 203 #ifdef CONFIG_SERIAL_8250_CONSOLE
 204         char console_string[40];
 205         int baud = 0;
 206         char parity = '\0', bits = '\0', flow = '\0';
 207         char *s, *p;
 208
 209         if (strstr(prom_getcmdline(), "console="))
 210                 return;
 211
 212         s = prom_getenv("modetty0");
 213         if (s) {
 214                 baud = simple_strtoul(s, &p, 10);
 215                 s = p;
 216                 if (*s == ',')
 217                         s++;
 218                 if (*s)
 219                         parity = *s++;
 220                 if (*s == ',')
 221                         s++;
 222                 if (*s)
 223                         bits = *s++;
 224                 if (*s == ',')
 225                         s++;
 226                 if (*s == 'h')
 227                         flow = 'r';
 228         }
 229
 230         if (baud == 0)
 231                 baud = 38400;
 232         if (parity != 'n' && parity != 'o' && parity != 'e')
 233                 parity = 'n';
 234         if (bits != '7' && bits != '8')
 235                 bits = '8';
 236
 237         if (flow == 'r')
 238                 sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
 239                         parity, bits, flow);
 240         else
 241                 sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
 242                         bits);
 243         strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
 244 #endif
 245 }
 246
 247 void __init prom_init(void)
 248 {
 249         ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
 250         ar7_init_env((struct env_var *)fw_arg2);
 251         console_config();
 252 }
 253
 254 #define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
 255 static inline unsigned int serial_in(int offset)
 256 {
 257         return readl((void *)PORT(offset));
 258 }
 259
 260 static inline void serial_out(int offset, int value)
 261 {
 262         writel(value, (void *)PORT(offset));
 263 }
 264
 265 int prom_putchar(char c)
 266 {
 267         while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
 268                 ;
 269         serial_out(UART_TX, c);
 270         return 1;
 271 }