arch/arm/plat-orion/addr-map.c

   1 /*
   2  * arch/arm/plat-orion/addr-map.c
   3  *
   4  * Address map functions for Marvell Orion based SoCs
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2.  This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/mbus.h>
  15 #include <linux/io.h>
  16 #include <plat/addr-map.h>
  17
  18 struct mbus_dram_target_info orion_mbus_dram_info;
  19
  20 const struct mbus_dram_target_info *mv_mbus_dram_info(void)
  21 {
  22         return &orion_mbus_dram_info;
  23 }
  24 EXPORT_SYMBOL_GPL(mv_mbus_dram_info);
  25
  26 /*
  27  * DDR target is the same on all Orion platforms.
  28  */
  29 #define TARGET_DDR              0
  30
  31 /*
  32  * Helpers to get DDR bank info
  33  */
  34 #define DDR_BASE_CS_OFF(n)      (0x0000 + ((n) << 3))
  35 #define DDR_SIZE_CS_OFF(n)      (0x0004 + ((n) << 3))
  36
  37 /*
  38  * CPU Address Decode Windows registers
  39  */
  40 #define WIN_CTRL_OFF            0x0000
  41 #define WIN_BASE_OFF            0x0004
  42 #define WIN_REMAP_LO_OFF        0x0008
  43 #define WIN_REMAP_HI_OFF        0x000c
  44
  45 /*
  46  * Default implementation
  47  */
  48 static void __init __iomem *
  49 orion_win_cfg_base(const struct orion_addr_map_cfg *cfg, int win)
  50 {
  51         return (void __iomem *)(cfg->bridge_virt_base + (win << 4));
  52 }
  53
  54 /*
  55  * Default implementation
  56  */
  57 static int __init orion_cpu_win_can_remap(const struct orion_addr_map_cfg *cfg,
  58                                           const int win)
  59 {
  60         if (win < cfg->remappable_wins)
  61                 return 1;
  62
  63         return 0;
  64 }
  65
  66 void __init orion_setup_cpu_win(const struct orion_addr_map_cfg *cfg,
  67                                 const int win, const u32 base,
  68                                 const u32 size, const u8 target,
  69                                 const u8 attr, const int remap)
  70 {
  71         void __iomem *addr = cfg->win_cfg_base(cfg, win);
  72         u32 ctrl, base_high, remap_addr;
  73
  74         if (win >= cfg->num_wins) {
  75                 printk(KERN_ERR "setup_cpu_win: trying to allocate window "
  76                        "%d when only %d allowed\n", win, cfg->num_wins);
  77         }
  78
  79         base_high = base & 0xffff0000;
  80         ctrl = ((size - 1) & 0xffff0000) | (attr << 8) | (target << 4) | 1;
  81
  82         writel(base_high, addr + WIN_BASE_OFF);
  83         writel(ctrl, addr + WIN_CTRL_OFF);
  84         if (cfg->cpu_win_can_remap(cfg, win)) {
  85                 if (remap < 0)
  86                         remap_addr = base;
  87                 else
  88                         remap_addr = remap;
  89                 writel(remap_addr & 0xffff0000, addr + WIN_REMAP_LO_OFF);
  90                 writel(0, addr + WIN_REMAP_HI_OFF);
  91         }
  92 }
  93
  94 /*
  95  * Configure a number of windows.
  96  */
  97 static void __init orion_setup_cpu_wins(const struct orion_addr_map_cfg * cfg,
  98                                         const struct orion_addr_map_info *info)
  99 {
 100         while (info->win != -1) {
 101                 orion_setup_cpu_win(cfg, info->win, info->base, info->size,
 102                                     info->target, info->attr, info->remap);
 103                 info++;
 104         }
 105 }
 106
 107 static void __init orion_disable_wins(const struct orion_addr_map_cfg * cfg)
 108 {
 109         void __iomem *addr;
 110         int i;
 111
 112         for (i = 0; i < cfg->num_wins; i++) {
 113                 addr = cfg->win_cfg_base(cfg, i);
 114
 115                 writel(0, addr + WIN_BASE_OFF);
 116                 writel(0, addr + WIN_CTRL_OFF);
 117                 if (cfg->cpu_win_can_remap(cfg, i)) {
 118                         writel(0, addr + WIN_REMAP_LO_OFF);
 119                         writel(0, addr + WIN_REMAP_HI_OFF);
 120                 }
 121         }
 122 }
 123
 124 /*
 125  * Disable, clear and configure windows.
 126  */
 127 void __init orion_config_wins(struct orion_addr_map_cfg * cfg,
 128                               const struct orion_addr_map_info *info)
 129 {
 130         if (!cfg->cpu_win_can_remap)
 131                 cfg->cpu_win_can_remap = orion_cpu_win_can_remap;
 132
 133         if (!cfg->win_cfg_base)
 134                 cfg->win_cfg_base = orion_win_cfg_base;
 135
 136         orion_disable_wins(cfg);
 137
 138         if (info)
 139                 orion_setup_cpu_wins(cfg, info);
 140 }
 141
 142 /*
 143  * Setup MBUS dram target info.
 144  */
 145 void __init orion_setup_cpu_mbus_target(const struct orion_addr_map_cfg *cfg,
 146                                         const u32 ddr_window_cpu_base)
 147 {
 148         void __iomem *addr;
 149         int i;
 150         int cs;
 151
 152         orion_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
 153
 154         addr = (void __iomem *)ddr_window_cpu_base;
 155
 156         for (i = 0, cs = 0; i < 4; i++) {
 157                 u32 base = readl(addr + DDR_BASE_CS_OFF(i));
 158                 u32 size = readl(addr + DDR_SIZE_CS_OFF(i));
 159
 160                 /*
 161                  * Chip select enabled?
 162                  */
 163                 if (size & 1) {
 164                         struct mbus_dram_window *w;
 165
 166                         w = &orion_mbus_dram_info.cs[cs++];
 167                         w->cs_index = i;
 168                         w->mbus_attr = 0xf & ~(1 << i);
 169                         w->base = base & 0xffff0000;
 170                         w->size = (size | 0x0000ffff) + 1;
 171                 }
 172         }
 173         orion_mbus_dram_info.num_cs = cs;
 174 }