release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-orion5x/addr-map.c

   1 /*
   2  * arch/arm/mach-orion5x/addr-map.c
   3  *
   4  * Address map functions for Marvell Orion 5x SoCs
   5  *
   6  * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2.  This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/mbus.h>
  16 #include <linux/io.h>
  17 #include <linux/errno.h>
  18 #include <mach/hardware.h>
  19 #include "common.h"
  20
  21 /*
  22  * The Orion has fully programable address map. There's a separate address
  23  * map for each of the device _master_ interfaces, e.g. CPU, PCI, PCIe, USB,
  24  * Gigabit Ethernet, DMA/XOR engines, etc. Each interface has its own
  25  * address decode windows that allow it to access any of the Orion resources.
  26  *
  27  * CPU address decoding --
  28  * Linux assumes that it is the boot loader that already setup the access to
  29  * DDR and internal registers.
  30  * Setup access to PCI and PCIe IO/MEM space is issued by this file.
  31  * Setup access to various devices located on the device bus interface (e.g.
  32  * flashes, RTC, etc) should be issued by machine-setup.c according to
  33  * specific board population (by using orion5x_setup_*_win()).
  34  *
  35  * Non-CPU Masters address decoding --
  36  * Unlike the CPU, we setup the access from Orion's master interfaces to DDR
  37  * banks only (the typical use case).
  38  * Setup access for each master to DDR is issued by platform device setup.
  39  */
  40
  41 /*
  42  * Generic Address Decode Windows bit settings
  43  */
  44 #define TARGET_DDR              0
  45 #define TARGET_DEV_BUS          1
  46 #define TARGET_PCI              3
  47 #define TARGET_PCIE             4
  48 #define TARGET_SRAM             9
  49 #define ATTR_PCIE_MEM           0x59
  50 #define ATTR_PCIE_IO            0x51
  51 #define ATTR_PCIE_WA            0x79
  52 #define ATTR_PCI_MEM            0x59
  53 #define ATTR_PCI_IO             0x51
  54 #define ATTR_DEV_CS0            0x1e
  55 #define ATTR_DEV_CS1            0x1d
  56 #define ATTR_DEV_CS2            0x1b
  57 #define ATTR_DEV_BOOT           0xf
  58 #define ATTR_SRAM               0x0
  59
  60 /*
  61  * Helpers to get DDR bank info
  62  */
  63 #define ORION5X_DDR_REG(x)      (ORION5X_DDR_VIRT_BASE | (x))
  64 #define DDR_BASE_CS(n)          ORION5X_DDR_REG(0x1500 + ((n) << 3))
  65 #define DDR_SIZE_CS(n)          ORION5X_DDR_REG(0x1504 + ((n) << 3))
  66
  67 /*
  68  * CPU Address Decode Windows registers
  69  */
  70 #define ORION5X_BRIDGE_REG(x)   (ORION5X_BRIDGE_VIRT_BASE | (x))
  71 #define CPU_WIN_CTRL(n)         ORION5X_BRIDGE_REG(0x000 | ((n) << 4))
  72 #define CPU_WIN_BASE(n)         ORION5X_BRIDGE_REG(0x004 | ((n) << 4))
  73 #define CPU_WIN_REMAP_LO(n)     ORION5X_BRIDGE_REG(0x008 | ((n) << 4))
  74 #define CPU_WIN_REMAP_HI(n)     ORION5X_BRIDGE_REG(0x00c | ((n) << 4))
  75
  76
  77 struct mbus_dram_target_info orion5x_mbus_dram_info;
  78 static int __initdata win_alloc_count;
  79
  80 static int __init orion5x_cpu_win_can_remap(int win)
  81 {
  82         u32 dev, rev;
  83
  84         orion5x_pcie_id(&dev, &rev);
  85         if ((dev == MV88F5281_DEV_ID && win < 4)
  86             || (dev == MV88F5182_DEV_ID && win < 2)
  87             || (dev == MV88F5181_DEV_ID && win < 2)
  88             || (dev == MV88F6183_DEV_ID && win < 4))
  89                 return 1;
  90
  91         return 0;
  92 }
  93
  94 static int __init setup_cpu_win(int win, u32 base, u32 size,
  95                                  u8 target, u8 attr, int remap)
  96 {
  97         if (win >= 8) {
  98                 printk(KERN_ERR "setup_cpu_win: trying to allocate "
  99                                 "window %d\n", win);
 100                 return -ENOSPC;
 101         }
 102
 103         writel(base & 0xffff0000, CPU_WIN_BASE(win));
 104         writel(((size - 1) & 0xffff0000) | (attr << 8) | (target << 4) | 1,
 105                 CPU_WIN_CTRL(win));
 106
 107         if (orion5x_cpu_win_can_remap(win)) {
 108                 if (remap < 0)
 109                         remap = base;
 110
 111                 writel(remap & 0xffff0000, CPU_WIN_REMAP_LO(win));
 112                 writel(0, CPU_WIN_REMAP_HI(win));
 113         }
 114         return 0;
 115 }
 116
 117 void __init orion5x_setup_cpu_mbus_bridge(void)
 118 {
 119         int i;
 120         int cs;
 121
 122         /*
 123          * First, disable and clear windows.
 124          */
 125         for (i = 0; i < 8; i++) {
 126                 writel(0, CPU_WIN_BASE(i));
 127                 writel(0, CPU_WIN_CTRL(i));
 128                 if (orion5x_cpu_win_can_remap(i)) {
 129                         writel(0, CPU_WIN_REMAP_LO(i));
 130                         writel(0, CPU_WIN_REMAP_HI(i));
 131                 }
 132         }
 133
 134         /*
 135          * Setup windows for PCI+PCIe IO+MEM space.
 136          */
 137         setup_cpu_win(0, ORION5X_PCIE_IO_PHYS_BASE, ORION5X_PCIE_IO_SIZE,
 138                 TARGET_PCIE, ATTR_PCIE_IO, ORION5X_PCIE_IO_BUS_BASE);
 139         setup_cpu_win(1, ORION5X_PCI_IO_PHYS_BASE, ORION5X_PCI_IO_SIZE,
 140                 TARGET_PCI, ATTR_PCI_IO, ORION5X_PCI_IO_BUS_BASE);
 141         setup_cpu_win(2, ORION5X_PCIE_MEM_PHYS_BASE, ORION5X_PCIE_MEM_SIZE,
 142                 TARGET_PCIE, ATTR_PCIE_MEM, -1);
 143         setup_cpu_win(3, ORION5X_PCI_MEM_PHYS_BASE, ORION5X_PCI_MEM_SIZE,
 144                 TARGET_PCI, ATTR_PCI_MEM, -1);
 145         win_alloc_count = 4;
 146
 147         /*
 148          * Setup MBUS dram target info.
 149          */
 150         orion5x_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
 151
 152         for (i = 0, cs = 0; i < 4; i++) {
 153                 u32 base = readl(DDR_BASE_CS(i));
 154                 u32 size = readl(DDR_SIZE_CS(i));
 155
 156                 /*
 157                  * Chip select enabled?
 158                  */
 159                 if (size & 1) {
 160                         struct mbus_dram_window *w;
 161
 162                         w = &orion5x_mbus_dram_info.cs[cs++];
 163                         w->cs_index = i;
 164                         w->mbus_attr = 0xf & ~(1 << i);
 165                         w->base = base & 0xffff0000;
 166                         w->size = (size | 0x0000ffff) + 1;
 167                 }
 168         }
 169         orion5x_mbus_dram_info.num_cs = cs;
 170 }
 171
 172 void __init orion5x_setup_dev_boot_win(u32 base, u32 size)
 173 {
 174         setup_cpu_win(win_alloc_count++, base, size,
 175                       TARGET_DEV_BUS, ATTR_DEV_BOOT, -1);
 176 }
 177
 178 void __init orion5x_setup_dev0_win(u32 base, u32 size)
 179 {
 180         setup_cpu_win(win_alloc_count++, base, size,
 181                       TARGET_DEV_BUS, ATTR_DEV_CS0, -1);
 182 }
 183
 184 void __init orion5x_setup_dev1_win(u32 base, u32 size)
 185 {
 186         setup_cpu_win(win_alloc_count++, base, size,
 187                       TARGET_DEV_BUS, ATTR_DEV_CS1, -1);
 188 }
 189
 190 void __init orion5x_setup_dev2_win(u32 base, u32 size)
 191 {
 192         setup_cpu_win(win_alloc_count++, base, size,
 193                       TARGET_DEV_BUS, ATTR_DEV_CS2, -1);
 194 }
 195
 196 void __init orion5x_setup_pcie_wa_win(u32 base, u32 size)
 197 {
 198         setup_cpu_win(win_alloc_count++, base, size,
 199                       TARGET_PCIE, ATTR_PCIE_WA, -1);
 200 }
 201
 202 int __init orion5x_setup_sram_win(void)
 203 {
 204         return setup_cpu_win(win_alloc_count++, ORION5X_SRAM_PHYS_BASE,
 205                         ORION5X_SRAM_SIZE, TARGET_SRAM, ATTR_SRAM, -1);
 206 }