drivers/misc/fsl_law.c

   1 /*
   2  * Copyright 2008 Freescale Semiconductor, Inc.
   3  *
   4  * (C) Copyright 2000
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27 #include <asm/fsl_law.h>
  28 #include <asm/io.h>
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 #define LAWAR_EN        0x80000000
  33 /* number of LAWs in the hw implementation */
  34 #if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
  35     defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
  36 #define FSL_HW_NUM_LAWS 8
  37 #elif defined(CONFIG_MPC8548) || defined(CONFIG_MPC8544) || \
  38       defined(CONFIG_MPC8568) || \
  39       defined(CONFIG_MPC8641) || defined(CONFIG_MPC8610)
  40 #define FSL_HW_NUM_LAWS 10
  41 #elif defined(CONFIG_MPC8536) || defined(CONFIG_MPC8572)
  42 #define FSL_HW_NUM_LAWS 12
  43 #else
  44 #error FSL_HW_NUM_LAWS not defined for this platform
  45 #endif
  46
  47 void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
  48 {
  49         volatile u32 *base = (volatile u32 *)(CONFIG_SYS_IMMR + 0xc08);
  50         volatile u32 *lawbar = base + 8 * idx;
  51         volatile u32 *lawar = base + 8 * idx + 2;
  52
  53         gd->used_laws |= (1 << idx);
  54
  55         out_be32(lawbar, addr >> 12);
  56         out_be32(lawar, LAWAR_EN | ((u32)id << 20) | (u32)sz);
  57
  58         return ;
  59 }
  60
  61 int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
  62 {
  63         u32 idx = ffz(gd->used_laws);
  64
  65         if (idx >= FSL_HW_NUM_LAWS)
  66                 return -1;
  67
  68         set_law(idx, addr, sz, id);
  69
  70         return idx;
  71 }
  72
  73 int set_last_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
  74 {
  75         u32 idx;
  76
  77         /* we have no LAWs free */
  78         if (gd->used_laws == -1)
  79                 return -1;
  80
  81         /* grab the last free law */
  82         idx = __ilog2(~(gd->used_laws));
  83
  84         if (idx >= FSL_HW_NUM_LAWS)
  85                 return -1;
  86
  87         set_law(idx, addr, sz, id);
  88
  89         return idx;
  90 }
  91
  92 void disable_law(u8 idx)
  93 {
  94         volatile u32 *base = (volatile u32 *)(CONFIG_SYS_IMMR + 0xc08);
  95         volatile u32 *lawbar = base + 8 * idx;
  96         volatile u32 *lawar = base + 8 * idx + 2;
  97
  98         gd->used_laws &= ~(1 << idx);
  99
 100         out_be32(lawar, 0);
 101         out_be32(lawbar, 0);
 102
 103         return;
 104 }
 105
 106 void print_laws(void)
 107 {
 108         volatile u32 *base = (volatile u32 *)(CONFIG_SYS_IMMR + 0xc08);
 109         volatile u32 *lawbar = base;
 110         volatile u32 *lawar = base + 2;
 111         int i;
 112
 113         printf("\nLocal Access Window Configuration\n");
 114         for(i = 0; i < FSL_HW_NUM_LAWS; i++) {
 115                 printf("\tLAWBAR%d : 0x%08x, LAWAR%d : 0x%08x\n",
 116                        i, in_be32(lawbar), i, in_be32(lawar));
 117                 lawbar += 8;
 118                 lawar += 8;
 119         }
 120
 121         return;
 122 }
 123
 124 /* use up to 2 LAWs for DDR, used the last available LAWs */
 125 int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id)
 126 {
 127         u64 start_align, law_sz;
 128         int law_sz_enc;
 129
 130         if (start == 0)
 131                 start_align = 1ull << (LAW_SIZE_32G + 1);
 132         else
 133                 start_align = 1ull << (ffs64(start) - 1);
 134         law_sz = min(start_align, sz);
 135         law_sz_enc = __ilog2_u64(law_sz) - 1;
 136
 137         if (set_last_law(start, law_sz_enc, id) < 0)
 138                 return -1;
 139
 140         /* do we still have anything to map */
 141         sz = sz - law_sz;
 142         if (sz) {
 143                 start += law_sz;
 144
 145                 start_align = 1ull << (ffs64(start) - 1);
 146                 law_sz = min(start_align, sz);
 147                 law_sz_enc = __ilog2_u64(law_sz) - 1;
 148
 149                 if (set_last_law(start, law_sz_enc, id) < 0)
 150                         return -1;
 151         } else {
 152                 return 0;
 153         }
 154
 155         /* do we still have anything to map */
 156         sz = sz - law_sz;
 157         if (sz)
 158                 return 1;
 159
 160         return 0;
 161 }
 162
 163 void init_laws(void)
 164 {
 165         int i;
 166
 167         gd->used_laws = ~((1 << FSL_HW_NUM_LAWS) - 1);
 168
 169         for (i = 0; i < num_law_entries; i++) {
 170                 if (law_table[i].index == -1)
 171                         set_next_law(law_table[i].addr, law_table[i].size,
 172                                         law_table[i].trgt_id);
 173                 else
 174                         set_law(law_table[i].index, law_table[i].addr,
 175                                 law_table[i].size, law_table[i].trgt_id);
 176         }
 177
 178         return ;
 179 }