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   1 /*
   2  * arch/arm/mach-kirkwood/addr-map.c
   3  *
   4  * Address map functions for Marvell Kirkwood 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/init.h>
  13 #include <linux/mbus.h>
  14 #include <linux/io.h>
  15 #include <mach/hardware.h>
  16 #include "common.h"
  17
  18 /*
  19  * Generic Address Decode Windows bit settings
  20  */
  21 #define TARGET_DDR              0
  22 #define TARGET_DEV_BUS          1
  23 #define TARGET_SRAM             3
  24 #define TARGET_PCIE             4
  25 #define ATTR_DEV_SPI_ROM        0x1e
  26 #define ATTR_DEV_BOOT           0x1d
  27 #define ATTR_DEV_NAND           0x2f
  28 #define ATTR_DEV_CS3            0x37
  29 #define ATTR_DEV_CS2            0x3b
  30 #define ATTR_DEV_CS1            0x3d
  31 #define ATTR_DEV_CS0            0x3e
  32 #define ATTR_PCIE_IO            0xe0
  33 #define ATTR_PCIE_MEM           0xe8
  34 #define ATTR_SRAM               0x01
  35
  36 /*
  37  * Helpers to get DDR bank info
  38  */
  39 #define DDR_BASE_CS_OFF(n)      (0x0000 + ((n) << 3))
  40 #define DDR_SIZE_CS_OFF(n)      (0x0004 + ((n) << 3))
  41
  42 /*
  43  * CPU Address Decode Windows registers
  44  */
  45 #define WIN_OFF(n)              (BRIDGE_VIRT_BASE + 0x0000 + ((n) << 4))
  46 #define WIN_CTRL_OFF            0x0000
  47 #define WIN_BASE_OFF            0x0004
  48 #define WIN_REMAP_LO_OFF        0x0008
  49 #define WIN_REMAP_HI_OFF        0x000c
  50
  51
  52 struct mbus_dram_target_info kirkwood_mbus_dram_info;
  53
  54 static int __init cpu_win_can_remap(int win)
  55 {
  56         if (win < 4)
  57                 return 1;
  58
  59         return 0;
  60 }
  61
  62 static void __init setup_cpu_win(int win, u32 base, u32 size,
  63                                  u8 target, u8 attr, int remap)
  64 {
  65         void __iomem *addr = (void __iomem *)WIN_OFF(win);
  66         u32 ctrl;
  67
  68         base &= 0xffff0000;
  69         ctrl = ((size - 1) & 0xffff0000) | (attr << 8) | (target << 4) | 1;
  70
  71         writel(base, addr + WIN_BASE_OFF);
  72         writel(ctrl, addr + WIN_CTRL_OFF);
  73         if (cpu_win_can_remap(win)) {
  74                 if (remap < 0)
  75                         remap = base;
  76
  77                 writel(remap & 0xffff0000, addr + WIN_REMAP_LO_OFF);
  78                 writel(0, addr + WIN_REMAP_HI_OFF);
  79         }
  80 }
  81
  82 void __init kirkwood_setup_cpu_mbus(void)
  83 {
  84         void __iomem *addr;
  85         int i;
  86         int cs;
  87
  88         /*
  89          * First, disable and clear windows.
  90          */
  91         for (i = 0; i < 8; i++) {
  92                 addr = (void __iomem *)WIN_OFF(i);
  93
  94                 writel(0, addr + WIN_BASE_OFF);
  95                 writel(0, addr + WIN_CTRL_OFF);
  96                 if (cpu_win_can_remap(i)) {
  97                         writel(0, addr + WIN_REMAP_LO_OFF);
  98                         writel(0, addr + WIN_REMAP_HI_OFF);
  99                 }
 100         }
 101
 102         /*
 103          * Setup windows for PCIe IO+MEM space.
 104          */
 105         setup_cpu_win(0, KIRKWOOD_PCIE_IO_PHYS_BASE, KIRKWOOD_PCIE_IO_SIZE,
 106                       TARGET_PCIE, ATTR_PCIE_IO, KIRKWOOD_PCIE_IO_BUS_BASE);
 107         setup_cpu_win(1, KIRKWOOD_PCIE_MEM_PHYS_BASE, KIRKWOOD_PCIE_MEM_SIZE,
 108                       TARGET_PCIE, ATTR_PCIE_MEM, -1);
 109
 110         /*
 111          * Setup window for NAND controller.
 112          */
 113         setup_cpu_win(2, KIRKWOOD_NAND_MEM_PHYS_BASE, KIRKWOOD_NAND_MEM_SIZE,
 114                       TARGET_DEV_BUS, ATTR_DEV_NAND, -1);
 115
 116         /*
 117          * Setup window for SRAM.
 118          */
 119         setup_cpu_win(3, KIRKWOOD_SRAM_PHYS_BASE, KIRKWOOD_SRAM_SIZE,
 120                       TARGET_SRAM, ATTR_SRAM, -1);
 121
 122         /*
 123          * Setup MBUS dram target info.
 124          */
 125         kirkwood_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
 126
 127         addr = (void __iomem *)DDR_WINDOW_CPU_BASE;
 128
 129         for (i = 0, cs = 0; i < 4; i++) {
 130                 u32 base = readl(addr + DDR_BASE_CS_OFF(i));
 131                 u32 size = readl(addr + DDR_SIZE_CS_OFF(i));
 132
 133                 /*
 134                  * Chip select enabled?
 135                  */
 136                 if (size & 1) {
 137                         struct mbus_dram_window *w;
 138
 139                         w = &kirkwood_mbus_dram_info.cs[cs++];
 140                         w->cs_index = i;
 141                         w->mbus_attr = 0xf & ~(1 << i);
 142                         w->base = base & 0xffff0000;
 143                         w->size = (size | 0x0000ffff) + 1;
 144                 }
 145         }
 146         kirkwood_mbus_dram_info.num_cs = cs;
 147 }