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 <mach/hardware.h>
  18 #include "common.h"
  19
  20 /*
  21  * The Orion has fully programable address map. There's a separate address
  22  * map for each of the device _master_ interfaces, e.g. CPU, PCI, PCIe, USB,
  23  * Gigabit Ethernet, DMA/XOR engines, etc. Each interface has its own
  24  * address decode windows that allow it to access any of the Orion resources.
  25  *
  26  * CPU address decoding --
  27  * Linux assumes that it is the boot loader that already setup the access to
  28  * DDR and internal registers.
  29  * Setup access to PCI and PCIe IO/MEM space is issued by this file.
  30  * Setup access to various devices located on the device bus interface (e.g.
  31  * flashes, RTC, etc) should be issued by machine-setup.c according to
  32  * specific board population (by using orion5x_setup_*_win()).
  33  *
  34  * Non-CPU Masters address decoding --
  35  * Unlike the CPU, we setup the access from Orion's master interfaces to DDR
  36  * banks only (the typical use case).
  37  * Setup access for each master to DDR is issued by platform device setup.
  38  */
  39
  40 /*
  41  * Generic Address Decode Windows bit settings
  42  */
  43 #define TARGET_DDR              0
  44 #define TARGET_DEV_BUS          1
  45 #define TARGET_PCI              3
  46 #define TARGET_PCIE             4
  47 #define ATTR_PCIE_MEM           0x59
  48 #define ATTR_PCIE_IO            0x51
  49 #define ATTR_PCIE_WA            0x79
  50 #define ATTR_PCI_MEM            0x59
  51 #define ATTR_PCI_IO             0x51
  52 #define ATTR_DEV_CS0            0x1e
  53 #define ATTR_DEV_CS1            0x1d
  54 #define ATTR_DEV_CS2            0x1b
  55 #define ATTR_DEV_BOOT           0xf
  56
  57 /*
  58  * Helpers to get DDR bank info
  59  */
  60 #define ORION5X_DDR_REG(x)      (ORION5X_DDR_VIRT_BASE | (x))
  61 #define DDR_BASE_CS(n)          ORION5X_DDR_REG(0x1500 + ((n) << 3))
  62 #define DDR_SIZE_CS(n)          ORION5X_DDR_REG(0x1504 + ((n) << 3))
  63
  64 /*
  65  * CPU Address Decode Windows registers
  66  */
  67 #define ORION5X_BRIDGE_REG(x)   (ORION5X_BRIDGE_VIRT_BASE | (x))
  68 #define CPU_WIN_CTRL(n)         ORION5X_BRIDGE_REG(0x000 | ((n) << 4))
  69 #define CPU_WIN_BASE(n)         ORION5X_BRIDGE_REG(0x004 | ((n) << 4))
  70 #define CPU_WIN_REMAP_LO(n)     ORION5X_BRIDGE_REG(0x008 | ((n) << 4))
  71 #define CPU_WIN_REMAP_HI(n)     ORION5X_BRIDGE_REG(0x00c | ((n) << 4))
  72
  73
  74 struct mbus_dram_target_info orion5x_mbus_dram_info;
  75 static int __initdata win_alloc_count;
  76
  77 static int __init orion5x_cpu_win_can_remap(int win)
  78 {
  79         u32 dev, rev;
  80
  81         orion5x_pcie_id(&dev, &rev);
  82         if ((dev == MV88F5281_DEV_ID && win < 4)
  83             || (dev == MV88F5182_DEV_ID && win < 2)
  84             || (dev == MV88F5181_DEV_ID && win < 2))
  85                 return 1;
  86
  87         return 0;
  88 }
  89
  90 static void __init setup_cpu_win(int win, u32 base, u32 size,
  91                                  u8 target, u8 attr, int remap)
  92 {
  93         if (win >= 8) {
  94                 printk(KERN_ERR "setup_cpu_win: trying to allocate "
  95                                 "window %d\n", win);
  96                 return;
  97         }
  98
  99         writel(base & 0xffff0000, CPU_WIN_BASE(win));
 100         writel(((size - 1) & 0xffff0000) | (attr << 8) | (target << 4) | 1,
 101                 CPU_WIN_CTRL(win));
 102
 103         if (orion5x_cpu_win_can_remap(win)) {
 104                 if (remap < 0)
 105                         remap = base;
 106
 107                 writel(remap & 0xffff0000, CPU_WIN_REMAP_LO(win));
 108                 writel(0, CPU_WIN_REMAP_HI(win));
 109         }
 110 }
 111
 112 void __init orion5x_setup_cpu_mbus_bridge(void)
 113 {
 114         int i;
 115         int cs;
 116
 117         /*
 118          * First, disable and clear windows.
 119          */
 120         for (i = 0; i < 8; i++) {
 121                 writel(0, CPU_WIN_BASE(i));
 122                 writel(0, CPU_WIN_CTRL(i));
 123                 if (orion5x_cpu_win_can_remap(i)) {
 124                         writel(0, CPU_WIN_REMAP_LO(i));
 125                         writel(0, CPU_WIN_REMAP_HI(i));
 126                 }
 127         }
 128
 129         /*
 130          * Setup windows for PCI+PCIe IO+MEM space.
 131          */
 132         setup_cpu_win(0, ORION5X_PCIE_IO_PHYS_BASE, ORION5X_PCIE_IO_SIZE,
 133                 TARGET_PCIE, ATTR_PCIE_IO, ORION5X_PCIE_IO_BUS_BASE);
 134         setup_cpu_win(1, ORION5X_PCI_IO_PHYS_BASE, ORION5X_PCI_IO_SIZE,
 135                 TARGET_PCI, ATTR_PCI_IO, ORION5X_PCI_IO_BUS_BASE);
 136         setup_cpu_win(2, ORION5X_PCIE_MEM_PHYS_BASE, ORION5X_PCIE_MEM_SIZE,
 137                 TARGET_PCIE, ATTR_PCIE_MEM, -1);
 138         setup_cpu_win(3, ORION5X_PCI_MEM_PHYS_BASE, ORION5X_PCI_MEM_SIZE,
 139                 TARGET_PCI, ATTR_PCI_MEM, -1);
 140         win_alloc_count = 4;
 141
 142         /*
 143          * Setup MBUS dram target info.
 144          */
 145         orion5x_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
 146
 147         for (i = 0, cs = 0; i < 4; i++) {
 148                 u32 base = readl(DDR_BASE_CS(i));
 149                 u32 size = readl(DDR_SIZE_CS(i));
 150
 151                 /*
 152                  * Chip select enabled?
 153                  */
 154                 if (size & 1) {
 155                         struct mbus_dram_window *w;
 156
 157                         w = &orion5x_mbus_dram_info.cs[cs++];
 158                         w->cs_index = i;
 159                         w->mbus_attr = 0xf & ~(1 << i);
 160                         w->base = base & 0xffff0000;
 161                         w->size = (size | 0x0000ffff) + 1;
 162                 }
 163         }
 164         orion5x_mbus_dram_info.num_cs = cs;
 165 }
 166
 167 void __init orion5x_setup_dev_boot_win(u32 base, u32 size)
 168 {
 169         setup_cpu_win(win_alloc_count++, base, size,
 170                       TARGET_DEV_BUS, ATTR_DEV_BOOT, -1);
 171 }
 172
 173 void __init orion5x_setup_dev0_win(u32 base, u32 size)
 174 {
 175         setup_cpu_win(win_alloc_count++, base, size,
 176                       TARGET_DEV_BUS, ATTR_DEV_CS0, -1);
 177 }
 178
 179 void __init orion5x_setup_dev1_win(u32 base, u32 size)
 180 {
 181         setup_cpu_win(win_alloc_count++, base, size,
 182                       TARGET_DEV_BUS, ATTR_DEV_CS1, -1);
 183 }
 184
 185 void __init orion5x_setup_dev2_win(u32 base, u32 size)
 186 {
 187         setup_cpu_win(win_alloc_count++, base, size,
 188                       TARGET_DEV_BUS, ATTR_DEV_CS2, -1);
 189 }
 190
 191 void __init orion5x_setup_pcie_wa_win(u32 base, u32 size)
 192 {
 193         setup_cpu_win(win_alloc_count++, base, size,
 194                       TARGET_PCIE, ATTR_PCIE_WA, -1);
 195 }