175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
/*
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* arch/arm/plat-orion/addr-map.c
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*
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* Address map functions for Marvell Orion based SoCs
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mbus.h>
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#include <linux/io.h>
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#include <plat/addr-map.h>
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struct mbus_dram_target_info orion_mbus_dram_info;
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const struct mbus_dram_target_info *mv_mbus_dram_info(void)
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{
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return &orion_mbus_dram_info;
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}
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EXPORT_SYMBOL_GPL(mv_mbus_dram_info);
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/*
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* DDR target is the same on all Orion platforms.
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*/
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#define TARGET_DDR 0
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/*
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* Helpers to get DDR bank info
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*/
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#define DDR_BASE_CS_OFF(n) (0x0000 + ((n) << 3))
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#define DDR_SIZE_CS_OFF(n) (0x0004 + ((n) << 3))
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/*
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* CPU Address Decode Windows registers
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*/
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#define WIN_CTRL_OFF 0x0000
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#define WIN_BASE_OFF 0x0004
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#define WIN_REMAP_LO_OFF 0x0008
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#define WIN_REMAP_HI_OFF 0x000c
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/*
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* Default implementation
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*/
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static void __init __iomem *
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orion_win_cfg_base(const struct orion_addr_map_cfg *cfg, int win)
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{
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return (void __iomem *)(cfg->bridge_virt_base + (win << 4));
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}
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/*
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* Default implementation
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*/
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static int __init orion_cpu_win_can_remap(const struct orion_addr_map_cfg *cfg,
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const int win)
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{
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if (win < cfg->remappable_wins)
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return 1;
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return 0;
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}
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void __init orion_setup_cpu_win(const struct orion_addr_map_cfg *cfg,
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const int win, const u32 base,
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const u32 size, const u8 target,
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const u8 attr, const int remap)
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{
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void __iomem *addr = cfg->win_cfg_base(cfg, win);
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u32 ctrl, base_high, remap_addr;
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if (win >= cfg->num_wins) {
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printk(KERN_ERR "setup_cpu_win: trying to allocate window "
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"%d when only %d allowed\n", win, cfg->num_wins);
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}
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base_high = base & 0xffff0000;
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ctrl = ((size - 1) & 0xffff0000) | (attr << 8) | (target << 4) | 1;
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writel(base_high, addr + WIN_BASE_OFF);
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writel(ctrl, addr + WIN_CTRL_OFF);
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if (cfg->cpu_win_can_remap(cfg, win)) {
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if (remap < 0)
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remap_addr = base;
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else
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remap_addr = remap;
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writel(remap_addr & 0xffff0000, addr + WIN_REMAP_LO_OFF);
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writel(0, addr + WIN_REMAP_HI_OFF);
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}
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}
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/*
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* Configure a number of windows.
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*/
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static void __init orion_setup_cpu_wins(const struct orion_addr_map_cfg * cfg,
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const struct orion_addr_map_info *info)
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{
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while (info->win != -1) {
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orion_setup_cpu_win(cfg, info->win, info->base, info->size,
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info->target, info->attr, info->remap);
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info++;
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}
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}
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static void __init orion_disable_wins(const struct orion_addr_map_cfg * cfg)
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{
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void __iomem *addr;
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int i;
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for (i = 0; i < cfg->num_wins; i++) {
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addr = cfg->win_cfg_base(cfg, i);
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writel(0, addr + WIN_BASE_OFF);
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writel(0, addr + WIN_CTRL_OFF);
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if (cfg->cpu_win_can_remap(cfg, i)) {
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writel(0, addr + WIN_REMAP_LO_OFF);
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writel(0, addr + WIN_REMAP_HI_OFF);
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}
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}
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}
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/*
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* Disable, clear and configure windows.
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*/
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void __init orion_config_wins(struct orion_addr_map_cfg * cfg,
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const struct orion_addr_map_info *info)
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{
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if (!cfg->cpu_win_can_remap)
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cfg->cpu_win_can_remap = orion_cpu_win_can_remap;
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if (!cfg->win_cfg_base)
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cfg->win_cfg_base = orion_win_cfg_base;
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orion_disable_wins(cfg);
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if (info)
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orion_setup_cpu_wins(cfg, info);
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}
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/*
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* Setup MBUS dram target info.
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*/
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void __init orion_setup_cpu_mbus_target(const struct orion_addr_map_cfg *cfg,
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const u32 ddr_window_cpu_base)
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{
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void __iomem *addr;
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int i;
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int cs;
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orion_mbus_dram_info.mbus_dram_target_id = TARGET_DDR;
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addr = (void __iomem *)ddr_window_cpu_base;
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for (i = 0, cs = 0; i < 4; i++) {
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u32 base = readl(addr + DDR_BASE_CS_OFF(i));
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u32 size = readl(addr + DDR_SIZE_CS_OFF(i));
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/*
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* Chip select enabled?
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*/
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if (size & 1) {
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struct mbus_dram_window *w;
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w = &orion_mbus_dram_info.cs[cs++];
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w->cs_index = i;
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w->mbus_attr = 0xf & ~(1 << i);
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w->base = base & 0xffff0000;
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w->size = (size | 0x0000ffff) + 1;
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}
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}
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orion_mbus_dram_info.num_cs = cs;
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}
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