1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * OMAP SRAM detection and management 5 * 6 * Copyright (C) 2005 Nokia Corporation 7 * Written by Tony Lindgren <tony@atomide.com> 8 * 9 * Copyright (C) 2009-2012 Texas Instruments 10 * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com> 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/io.h> 17 #include <linux/set_memory.h> 18 19 #include <asm/fncpy.h> 20 #include <asm/tlb.h> 21 #include <asm/cacheflush.h> 22 23 #include <asm/mach/map.h> 24 25 #include "soc.h" 26 #include "iomap.h" 27 #include "prm2xxx_3xxx.h" 28 #include "sdrc.h" 29 #include "sram.h" 30 31 #define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800) 32 #define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000) 33 34 #define SRAM_BOOTLOADER_SZ 0x00 35 36 #define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048) 37 #define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050) 38 #define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058) 39 40 #define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848) 41 #define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850) 42 #define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858) 43 #define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880) 44 #define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048) 45 46 #define GP_DEVICE 0x300 47 48 #define ROUND_DOWN(value, boundary) ((value) & (~((boundary) - 1))) 49 50 static unsigned long omap_sram_start; 51 static unsigned long omap_sram_size; 52 static void __iomem *omap_sram_base; 53 static unsigned long omap_sram_skip; 54 static void __iomem *omap_sram_ceil; 55 56 /* 57 * Memory allocator for SRAM: calculates the new ceiling address 58 * for pushing a function using the fncpy API. 59 * 60 * Note that fncpy requires the returned address to be aligned 61 * to an 8-byte boundary. 62 */ 63 static void *omap_sram_push_address(unsigned long size) 64 { 65 unsigned long available, new_ceil = (unsigned long)omap_sram_ceil; 66 67 available = omap_sram_ceil - (omap_sram_base + omap_sram_skip); 68 69 if (size > available) { 70 pr_err("Not enough space in SRAM\n"); 71 return NULL; 72 } 73 74 new_ceil -= size; 75 new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN); 76 omap_sram_ceil = IOMEM(new_ceil); 77 78 return (void __force *)omap_sram_ceil; 79 } 80 81 void *omap_sram_push(void *funcp, unsigned long size) 82 { 83 void *sram; 84 unsigned long base; 85 int pages; 86 void *dst = NULL; 87 88 sram = omap_sram_push_address(size); 89 if (!sram) 90 return NULL; 91 92 base = (unsigned long)sram & PAGE_MASK; 93 pages = PAGE_ALIGN(size) / PAGE_SIZE; 94 95 set_memory_rw(base, pages); 96 97 dst = fncpy(sram, funcp, size); 98 99 set_memory_rox(base, pages); 100 101 return dst; 102 } 103 104 /* 105 * The SRAM context is lost during off-idle and stack 106 * needs to be reset. 107 */ 108 static void omap_sram_reset(void) 109 { 110 omap_sram_ceil = omap_sram_base + omap_sram_size; 111 } 112 113 /* 114 * Depending on the target RAMFS firewall setup, the public usable amount of 115 * SRAM varies. The default accessible size for all device types is 2k. A GP 116 * device allows ARM11 but not other initiators for full size. This 117 * functionality seems ok until some nice security API happens. 118 */ 119 static int is_sram_locked(void) 120 { 121 if (omap_type() == OMAP2_DEVICE_TYPE_GP) { 122 /* RAMFW: R/W access to all initiators for all qualifier sets */ 123 if (cpu_is_omap242x()) { 124 writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */ 125 writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */ 126 writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */ 127 } 128 if (cpu_is_omap34xx()) { 129 writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */ 130 writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */ 131 writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */ 132 writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2); 133 writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0); 134 } 135 return 0; 136 } else 137 return 1; /* assume locked with no PPA or security driver */ 138 } 139 140 /* 141 * The amount of SRAM depends on the core type. 142 * Note that we cannot try to test for SRAM here because writes 143 * to secure SRAM will hang the system. Also the SRAM is not 144 * yet mapped at this point. 145 */ 146 static void __init omap_detect_sram(void) 147 { 148 omap_sram_skip = SRAM_BOOTLOADER_SZ; 149 if (is_sram_locked()) { 150 if (cpu_is_omap34xx()) { 151 omap_sram_start = OMAP3_SRAM_PUB_PA; 152 if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) || 153 (omap_type() == OMAP2_DEVICE_TYPE_SEC)) { 154 omap_sram_size = 0x7000; /* 28K */ 155 omap_sram_skip += SZ_16K; 156 } else { 157 omap_sram_size = 0x8000; /* 32K */ 158 } 159 } else { 160 omap_sram_start = OMAP2_SRAM_PUB_PA; 161 omap_sram_size = 0x800; /* 2K */ 162 } 163 } else { 164 if (cpu_is_omap34xx()) { 165 omap_sram_start = OMAP3_SRAM_PA; 166 omap_sram_size = 0x10000; /* 64K */ 167 } else { 168 omap_sram_start = OMAP2_SRAM_PA; 169 if (cpu_is_omap242x()) 170 omap_sram_size = 0xa0000; /* 640K */ 171 else if (cpu_is_omap243x()) 172 omap_sram_size = 0x10000; /* 64K */ 173 } 174 } 175 } 176 177 /* 178 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early. 179 */ 180 static void __init omap2_map_sram(void) 181 { 182 unsigned long base; 183 int pages; 184 int cached = 1; 185 186 if (cpu_is_omap34xx()) { 187 /* 188 * SRAM must be marked as non-cached on OMAP3 since the 189 * CORE DPLL M2 divider change code (in SRAM) runs with the 190 * SDRAM controller disabled, and if it is marked cached, 191 * the ARM may attempt to write cache lines back to SDRAM 192 * which will cause the system to hang. 193 */ 194 cached = 0; 195 } 196 197 if (omap_sram_size == 0) 198 return; 199 200 omap_sram_start = ROUND_DOWN(omap_sram_start, PAGE_SIZE); 201 omap_sram_base = __arm_ioremap_exec(omap_sram_start, omap_sram_size, cached); 202 if (!omap_sram_base) { 203 pr_err("SRAM: Could not map\n"); 204 return; 205 } 206 207 omap_sram_reset(); 208 209 /* 210 * Looks like we need to preserve some bootloader code at the 211 * beginning of SRAM for jumping to flash for reboot to work... 212 */ 213 memset_io(omap_sram_base + omap_sram_skip, 0, 214 omap_sram_size - omap_sram_skip); 215 216 base = (unsigned long)omap_sram_base; 217 pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE; 218 219 set_memory_rox(base, pages); 220 } 221 222 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, 223 u32 base_cs, u32 force_unlock); 224 225 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, 226 u32 base_cs, u32 force_unlock) 227 { 228 BUG_ON(!_omap2_sram_ddr_init); 229 _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl, 230 base_cs, force_unlock); 231 } 232 233 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val, 234 u32 mem_type); 235 236 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type) 237 { 238 BUG_ON(!_omap2_sram_reprogram_sdrc); 239 _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type); 240 } 241 242 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass); 243 244 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass) 245 { 246 BUG_ON(!_omap2_set_prcm); 247 return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass); 248 } 249 250 #ifdef CONFIG_SOC_OMAP2420 251 static int __init omap242x_sram_init(void) 252 { 253 _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init, 254 omap242x_sram_ddr_init_sz); 255 256 _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc, 257 omap242x_sram_reprogram_sdrc_sz); 258 259 _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm, 260 omap242x_sram_set_prcm_sz); 261 262 return 0; 263 } 264 #else 265 static inline int omap242x_sram_init(void) 266 { 267 return 0; 268 } 269 #endif 270 271 #ifdef CONFIG_SOC_OMAP2430 272 static int __init omap243x_sram_init(void) 273 { 274 _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init, 275 omap243x_sram_ddr_init_sz); 276 277 _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc, 278 omap243x_sram_reprogram_sdrc_sz); 279 280 _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm, 281 omap243x_sram_set_prcm_sz); 282 283 return 0; 284 } 285 #else 286 static inline int omap243x_sram_init(void) 287 { 288 return 0; 289 } 290 #endif 291 292 #ifdef CONFIG_ARCH_OMAP3 293 294 void omap3_sram_restore_context(void) 295 { 296 omap_sram_reset(); 297 298 omap_push_sram_idle(); 299 } 300 301 static inline int omap34xx_sram_init(void) 302 { 303 omap3_sram_restore_context(); 304 return 0; 305 } 306 #else 307 static inline int omap34xx_sram_init(void) 308 { 309 return 0; 310 } 311 #endif /* CONFIG_ARCH_OMAP3 */ 312 313 int __init omap_sram_init(void) 314 { 315 omap_detect_sram(); 316 omap2_map_sram(); 317 318 if (cpu_is_omap242x()) 319 omap242x_sram_init(); 320 else if (cpu_is_omap2430()) 321 omap243x_sram_init(); 322 else if (cpu_is_omap34xx()) 323 omap34xx_sram_init(); 324 325 return 0; 326 } 327