target/linux/bcm63xx/image/lzma-loader/src/board.c

   1 /*
   2  * BCM63XX specific implementation parts
   3  *
   4  * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation.
   9  */
  10
  11 #include <stddef.h>
  12 #include "config.h"
  13 #include "cp0regdef.h"
  14
  15 #define READREG(r)      *(volatile unsigned int *)(r)
  16 #define WRITEREG(r,v)   *(volatile unsigned int *)(r) = v
  17
  18 #define UART_IR_REG     0x10
  19 #define UART_FIFO_REG   0x14
  20
  21 unsigned long uart_base;
  22
  23 static void wait_xfered(void)
  24 {
  25         unsigned int val;
  26
  27         do {
  28                 val = READREG(uart_base + UART_IR_REG);
  29                 if (val & (1 << 5))
  30                         break;
  31         } while (1);
  32 }
  33
  34 void board_putc(int ch)
  35 {
  36         if (!uart_base)
  37                 return;
  38
  39         wait_xfered();
  40         WRITEREG(uart_base + UART_FIFO_REG, ch);
  41         wait_xfered();
  42 }
  43
  44 #define PRID_IMP_BMIPS32_REV4   0x4000
  45 #define PRID_IMP_BMIPS32_REV8   0x8000
  46 #define PRID_IMP_BMIPS3300      0x9000
  47 #define PRID_IMP_BMIPS3300_ALT  0x9100
  48 #define PRID_IMP_BMIPS3300_BUG  0x0000
  49 #define PRID_IMP_BMIPS43XX      0xa000
  50
  51 void board_init(void)
  52 {
  53         unsigned long prid, chipid, chipid_reg;
  54
  55         prid = read_32bit_c0_register($15, 0);
  56
  57         switch (prid & 0xff00) {
  58         case PRID_IMP_BMIPS32_REV4:
  59         case PRID_IMP_BMIPS32_REV8:
  60         case PRID_IMP_BMIPS3300_ALT:
  61         case PRID_IMP_BMIPS3300_BUG:
  62                 chipid_reg = 0xfffe0000;
  63                 break;
  64         case PRID_IMP_BMIPS3300:
  65                 if ((prid & 0xff) >= 0x33)
  66                         chipid_reg = 0xb0000000;
  67                 else
  68                         chipid_reg = 0xfffe0000;
  69                 break;
  70         case PRID_IMP_BMIPS43XX:
  71                 if ((prid & 0xff) == 0x04)
  72                         chipid_reg = 0xfff8c000;
  73                 else if ((prid & 0xff) == 0x70)
  74                         return; /* FIXME: 0002a070 can be 6362 and 3380 */
  75                 else if ((prid & 0xff) >= 0x30)
  76                         chipid_reg = 0xb0000000;
  77                 else
  78                         chipid_reg = 0xfffe0000;
  79                 break;
  80         default:
  81                 return;
  82         }
  83
  84         chipid = READREG(chipid_reg);
  85
  86         switch (chipid >> 16) {
  87         case 0x3368:
  88         case 0x6318:
  89         case 0x6328:
  90         case 0x6358:
  91         case 0x6362:
  92         case 0x6368:
  93         case 0x6369:
  94                 uart_base = chipid_reg + 0x100;
  95                 break;
  96         case 0x6316:
  97         case 0x6326:
  98                 uart_base = chipid_reg + 0x180;
  99                 break;
 100         case 0x3380:
 101                 uart_base = chipid_reg + 0x200;
 102                 break;
 103         case 0x6338:
 104         case 0x6345:
 105         case 0x6348:
 106                 uart_base = chipid_reg + 0x300;
 107                 break;
 108         default:
 109                 return;
 110         }
 111 }