Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/plat-omap/sram.c |
| 3 | * |
| 4 | * OMAP SRAM detection and management |
| 5 | * |
| 6 | * Copyright (C) 2005 Nokia Corporation |
| 7 | * Written by Tony Lindgren <tony@atomide.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/config.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | |
| 19 | #include <asm/mach/map.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/cacheflush.h> |
| 22 | |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 23 | #include <asm/arch/sram.h> |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 24 | |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 25 | #define OMAP1_SRAM_PA 0x20000000 |
| 26 | #define OMAP1_SRAM_VA 0xd0000000 |
| 27 | #define OMAP2_SRAM_PA 0x40200000 |
| 28 | #define OMAP2_SRAM_VA 0xd0000000 |
| 29 | |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 30 | #define SRAM_BOOTLOADER_SZ 0x80 |
| 31 | |
| 32 | static unsigned long omap_sram_base; |
| 33 | static unsigned long omap_sram_size; |
| 34 | static unsigned long omap_sram_ceil; |
| 35 | |
| 36 | /* |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 37 | * The amount of SRAM depends on the core type. |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 38 | * Note that we cannot try to test for SRAM here because writes |
| 39 | * to secure SRAM will hang the system. Also the SRAM is not |
| 40 | * yet mapped at this point. |
| 41 | */ |
| 42 | void __init omap_detect_sram(void) |
| 43 | { |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 44 | if (!cpu_is_omap24xx()) |
| 45 | omap_sram_base = OMAP1_SRAM_VA; |
| 46 | else |
| 47 | omap_sram_base = OMAP2_SRAM_VA; |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 48 | |
| 49 | if (cpu_is_omap730()) |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 50 | omap_sram_size = 0x32000; /* 200K */ |
| 51 | else if (cpu_is_omap15xx()) |
| 52 | omap_sram_size = 0x30000; /* 192K */ |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 53 | else if (cpu_is_omap1610() || cpu_is_omap1621() || cpu_is_omap1710()) |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 54 | omap_sram_size = 0x4000; /* 16K */ |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 55 | else if (cpu_is_omap1611()) |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 56 | omap_sram_size = 0x3e800; /* 250K */ |
| 57 | else if (cpu_is_omap2420()) |
| 58 | omap_sram_size = 0xa0014; /* 640K */ |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 59 | else { |
| 60 | printk(KERN_ERR "Could not detect SRAM size\n"); |
| 61 | omap_sram_size = 0x4000; |
| 62 | } |
| 63 | |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 64 | omap_sram_ceil = omap_sram_base + omap_sram_size; |
| 65 | } |
| 66 | |
| 67 | static struct map_desc omap_sram_io_desc[] __initdata = { |
Deepak Saxena | 9fe133b | 2005-10-28 15:19:00 +0100 | [diff] [blame] | 68 | { /* .length gets filled in at runtime */ |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 69 | .virtual = OMAP1_SRAM_VA, |
| 70 | .pfn = __phys_to_pfn(OMAP1_SRAM_PA), |
Deepak Saxena | 9fe133b | 2005-10-28 15:19:00 +0100 | [diff] [blame] | 71 | .type = MT_DEVICE |
| 72 | } |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 73 | }; |
| 74 | |
| 75 | /* |
| 76 | * In order to use last 2kB of SRAM on 1611b, we must round the size |
| 77 | * up to multiple of PAGE_SIZE. We cannot use ioremap for SRAM, as |
| 78 | * clock init needs SRAM early. |
| 79 | */ |
| 80 | void __init omap_map_sram(void) |
| 81 | { |
| 82 | if (omap_sram_size == 0) |
| 83 | return; |
| 84 | |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 85 | if (cpu_is_omap24xx()) { |
| 86 | omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA; |
| 87 | omap_sram_io_desc[0].pfn = __phys_to_pfn(OMAP2_SRAM_PA); |
| 88 | } |
| 89 | |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 90 | omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE; |
| 91 | omap_sram_io_desc[0].length *= PAGE_SIZE; |
| 92 | iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc)); |
| 93 | |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 94 | printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n", |
| 95 | omap_sram_io_desc[0].pfn, omap_sram_io_desc[0].virtual, |
| 96 | omap_sram_io_desc[0].length); |
| 97 | |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 98 | /* |
| 99 | * Looks like we need to preserve some bootloader code at the |
| 100 | * beginning of SRAM for jumping to flash for reboot to work... |
| 101 | */ |
| 102 | memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0, |
| 103 | omap_sram_size - SRAM_BOOTLOADER_SZ); |
| 104 | } |
| 105 | |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 106 | void * omap_sram_push(void * start, unsigned long size) |
| 107 | { |
| 108 | if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) { |
| 109 | printk(KERN_ERR "Not enough space in SRAM\n"); |
| 110 | return NULL; |
| 111 | } |
| 112 | omap_sram_ceil -= size; |
| 113 | omap_sram_ceil &= ~0x3; |
| 114 | memcpy((void *)omap_sram_ceil, start, size); |
| 115 | |
| 116 | return (void *)omap_sram_ceil; |
| 117 | } |
| 118 | |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 119 | static void omap_sram_error(void) |
| 120 | { |
| 121 | panic("Uninitialized SRAM function\n"); |
| 122 | } |
| 123 | |
| 124 | #ifdef CONFIG_ARCH_OMAP1 |
| 125 | |
| 126 | static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl); |
| 127 | |
| 128 | void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl) |
| 129 | { |
| 130 | if (!_omap_sram_reprogram_clock) |
| 131 | omap_sram_error(); |
| 132 | |
| 133 | return _omap_sram_reprogram_clock(dpllctl, ckctl); |
| 134 | } |
| 135 | |
| 136 | int __init omap1_sram_init(void) |
| 137 | { |
| 138 | _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock, |
| 139 | sram_reprogram_clock_sz); |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | #else |
| 145 | #define omap1_sram_init() do {} while (0) |
| 146 | #endif |
| 147 | |
| 148 | #ifdef CONFIG_ARCH_OMAP2 |
| 149 | |
| 150 | static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, |
| 151 | u32 base_cs, u32 force_unlock); |
| 152 | |
| 153 | void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, |
| 154 | u32 base_cs, u32 force_unlock) |
| 155 | { |
| 156 | if (!_omap2_sram_ddr_init) |
| 157 | omap_sram_error(); |
| 158 | |
| 159 | return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl, |
| 160 | base_cs, force_unlock); |
| 161 | } |
| 162 | |
| 163 | static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val, |
| 164 | u32 mem_type); |
| 165 | |
| 166 | void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type) |
| 167 | { |
| 168 | if (!_omap2_sram_reprogram_sdrc) |
| 169 | omap_sram_error(); |
| 170 | |
| 171 | return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type); |
| 172 | } |
| 173 | |
| 174 | static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass); |
| 175 | |
| 176 | u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass) |
| 177 | { |
| 178 | if (!_omap2_set_prcm) |
| 179 | omap_sram_error(); |
| 180 | |
| 181 | return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass); |
| 182 | } |
| 183 | |
| 184 | int __init omap2_sram_init(void) |
| 185 | { |
| 186 | _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz); |
| 187 | |
| 188 | _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc, |
| 189 | sram_reprogram_sdrc_sz); |
| 190 | _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz); |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | #else |
| 195 | #define omap2_sram_init() do {} while (0) |
| 196 | #endif |
| 197 | |
| 198 | int __init omap_sram_init(void) |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 199 | { |
| 200 | omap_detect_sram(); |
| 201 | omap_map_sram(); |
Tony Lindgren | 1a8bfa1 | 2005-11-10 14:26:50 +0000 | [diff] [blame] | 202 | |
| 203 | if (!cpu_is_omap24xx()) |
| 204 | omap1_sram_init(); |
| 205 | else |
| 206 | omap2_sram_init(); |
| 207 | |
| 208 | return 0; |
Tony Lindgren | 92105bb | 2005-09-07 17:20:26 +0100 | [diff] [blame] | 209 | } |