LXR linux/arch/arm/mach-kirkwood/addr-map.c

   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
  52struct mbus_dram_target_info kirkwood_mbus_dram_info;
  53
  54static int __init cpu_win_can_remap(int win)
  55{
  56        if (win < 4)
  57                return 1;
  58
  59        return 0;
  60}
  61
  62static 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
  82void __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, KIRKWOOD_PCIE_MEM_BUS_BASE);
 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}
 148