1/* 2 * OMAP44xx sleep code. 3 * 4 * Copyright (C) 2011 Texas Instruments, Inc. 5 * Santosh Shilimkar <santosh.shilimkar@ti.com> 6 * 7 * This program is free software,you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12#include <linux/linkage.h> 13#include <asm/assembler.h> 14#include <asm/smp_scu.h> 15#include <asm/memory.h> 16#include <asm/hardware/cache-l2x0.h> 17 18#include "omap-secure.h" 19 20#include "common.h" 21#include "omap44xx.h" 22#include "omap4-sar-layout.h" 23 24#if defined(CONFIG_SMP) && defined(CONFIG_PM) 25 26.macro DO_SMC 27 dsb 28 smc #0 29 dsb 30.endm 31 32#ifdef CONFIG_ARCH_OMAP4 33 34/* 35 * ============================= 36 * == CPU suspend finisher == 37 * ============================= 38 * 39 * void omap4_finish_suspend(unsigned long cpu_state) 40 * 41 * This function code saves the CPU context and performs the CPU 42 * power down sequence. Calling WFI effectively changes the CPU 43 * power domains states to the desired target power state. 44 * 45 * @cpu_state : contains context save state (r0) 46 * 0 - No context lost 47 * 1 - CPUx L1 and logic lost: MPUSS CSWR 48 * 2 - CPUx L1 and logic lost + GIC lost: MPUSS OSWR 49 * 3 - CPUx L1 and logic lost + GIC + L2 lost: MPUSS OFF 50 * @return: This function never returns for CPU OFF and DORMANT power states. 51 * Post WFI, CPU transitions to DORMANT or OFF power state and on wake-up 52 * from this follows a full CPU reset path via ROM code to CPU restore code. 53 * The restore function pointer is stored at CPUx_WAKEUP_NS_PA_ADDR_OFFSET. 54 * It returns to the caller for CPU INACTIVE and ON power states or in case 55 * CPU failed to transition to targeted OFF/DORMANT state. 56 * 57 * omap4_finish_suspend() calls v7_flush_dcache_all() which doesn't save 58 * stack frame and it expects the caller to take care of it. Hence the entire 59 * stack frame is saved to avoid possible stack corruption. 60 */ 61ENTRY(omap4_finish_suspend) 62 stmfd sp!, {r4-r12, lr} 63 cmp r0, #0x0 64 beq do_WFI @ No lowpower state, jump to WFI 65 66 /* 67 * Flush all data from the L1 data cache before disabling 68 * SCTLR.C bit. 69 */ 70 bl omap4_get_sar_ram_base 71 ldr r9, [r0, #OMAP_TYPE_OFFSET] 72 cmp r9, #0x1 @ Check for HS device 73 bne skip_secure_l1_clean 74 mov r0, #SCU_PM_NORMAL 75 mov r1, #0xFF @ clean seucre L1 76 stmfd r13!, {r4-r12, r14} 77 ldr r12, =OMAP4_MON_SCU_PWR_INDEX 78 DO_SMC 79 ldmfd r13!, {r4-r12, r14} 80skip_secure_l1_clean: 81 bl v7_flush_dcache_all 82 83 /* 84 * Clear the SCTLR.C bit to prevent further data cache 85 * allocation. Clearing SCTLR.C would make all the data accesses 86 * strongly ordered and would not hit the cache. 87 */ 88 mrc p15, 0, r0, c1, c0, 0 89 bic r0, r0, #(1 << 2) @ Disable the C bit 90 mcr p15, 0, r0, c1, c0, 0 91 isb 92 93 bl v7_invalidate_l1 94 95 /* 96 * Switch the CPU from Symmetric Multiprocessing (SMP) mode 97 * to AsymmetricMultiprocessing (AMP) mode by programming 98 * the SCU power status to DORMANT or OFF mode. 99 * This enables the CPU to be taken out of coherency by 100 * preventing the CPU from receiving cache, TLB, or BTB 101 * maintenance operations broadcast by other CPUs in the cluster. 102 */ 103 bl omap4_get_sar_ram_base 104 mov r8, r0 105 ldr r9, [r8, #OMAP_TYPE_OFFSET] 106 cmp r9, #0x1 @ Check for HS device 107 bne scu_gp_set 108 mrc p15, 0, r0, c0, c0, 5 @ Read MPIDR 109 ands r0, r0, #0x0f 110 ldreq r0, [r8, #SCU_OFFSET0] 111 ldrne r0, [r8, #SCU_OFFSET1] 112 mov r1, #0x00 113 stmfd r13!, {r4-r12, r14} 114 ldr r12, =OMAP4_MON_SCU_PWR_INDEX 115 DO_SMC 116 ldmfd r13!, {r4-r12, r14} 117 b skip_scu_gp_set 118scu_gp_set: 119 mrc p15, 0, r0, c0, c0, 5 @ Read MPIDR 120 ands r0, r0, #0x0f 121 ldreq r1, [r8, #SCU_OFFSET0] 122 ldrne r1, [r8, #SCU_OFFSET1] 123 bl omap4_get_scu_base 124 bl scu_power_mode 125skip_scu_gp_set: 126 mrc p15, 0, r0, c1, c1, 2 @ Read NSACR data 127 tst r0, #(1 << 18) 128 mrcne p15, 0, r0, c1, c0, 1 129 bicne r0, r0, #(1 << 6) @ Disable SMP bit 130 mcrne p15, 0, r0, c1, c0, 1 131 isb 132 dsb 133#ifdef CONFIG_CACHE_L2X0 134 /* 135 * Clean and invalidate the L2 cache. 136 * Common cache-l2x0.c functions can't be used here since it 137 * uses spinlocks. We are out of coherency here with data cache 138 * disabled. The spinlock implementation uses exclusive load/store 139 * instruction which can fail without data cache being enabled. 140 * OMAP4 hardware doesn't support exclusive monitor which can 141 * overcome exclusive access issue. Because of this, CPU can 142 * lead to deadlock. 143 */ 144 bl omap4_get_sar_ram_base 145 mov r8, r0 146 mrc p15, 0, r5, c0, c0, 5 @ Read MPIDR 147 ands r5, r5, #0x0f 148 ldreq r0, [r8, #L2X0_SAVE_OFFSET0] @ Retrieve L2 state from SAR 149 ldrne r0, [r8, #L2X0_SAVE_OFFSET1] @ memory. 150 cmp r0, #3 151 bne do_WFI 152#ifdef CONFIG_PL310_ERRATA_727915 153 mov r0, #0x03 154 mov r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX 155 DO_SMC 156#endif 157 bl omap4_get_l2cache_base 158 mov r2, r0 159 ldr r0, =0xffff 160 str r0, [r2, #L2X0_CLEAN_INV_WAY] 161wait: 162 ldr r0, [r2, #L2X0_CLEAN_INV_WAY] 163 ldr r1, =0xffff 164 ands r0, r0, r1 165 bne wait 166#ifdef CONFIG_PL310_ERRATA_727915 167 mov r0, #0x00 168 mov r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX 169 DO_SMC 170#endif 171l2x_sync: 172 bl omap4_get_l2cache_base 173 mov r2, r0 174 mov r0, #0x0 175 str r0, [r2, #L2X0_CACHE_SYNC] 176sync: 177 ldr r0, [r2, #L2X0_CACHE_SYNC] 178 ands r0, r0, #0x1 179 bne sync 180#endif 181 182do_WFI: 183 bl omap_do_wfi 184 185 /* 186 * CPU is here when it failed to enter OFF/DORMANT or 187 * no low power state was attempted. 188 */ 189 mrc p15, 0, r0, c1, c0, 0 190 tst r0, #(1 << 2) @ Check C bit enabled? 191 orreq r0, r0, #(1 << 2) @ Enable the C bit 192 mcreq p15, 0, r0, c1, c0, 0 193 isb 194 195 /* 196 * Ensure the CPU power state is set to NORMAL in 197 * SCU power state so that CPU is back in coherency. 198 * In non-coherent mode CPU can lock-up and lead to 199 * system deadlock. 200 */ 201 mrc p15, 0, r0, c1, c0, 1 202 tst r0, #(1 << 6) @ Check SMP bit enabled? 203 orreq r0, r0, #(1 << 6) 204 mcreq p15, 0, r0, c1, c0, 1 205 isb 206 bl omap4_get_sar_ram_base 207 mov r8, r0 208 ldr r9, [r8, #OMAP_TYPE_OFFSET] 209 cmp r9, #0x1 @ Check for HS device 210 bne scu_gp_clear 211 mov r0, #SCU_PM_NORMAL 212 mov r1, #0x00 213 stmfd r13!, {r4-r12, r14} 214 ldr r12, =OMAP4_MON_SCU_PWR_INDEX 215 DO_SMC 216 ldmfd r13!, {r4-r12, r14} 217 b skip_scu_gp_clear 218scu_gp_clear: 219 bl omap4_get_scu_base 220 mov r1, #SCU_PM_NORMAL 221 bl scu_power_mode 222skip_scu_gp_clear: 223 isb 224 dsb 225 ldmfd sp!, {r4-r12, pc} 226ENDPROC(omap4_finish_suspend) 227 228/* 229 * ============================ 230 * == CPU resume entry point == 231 * ============================ 232 * 233 * void omap4_cpu_resume(void) 234 * 235 * ROM code jumps to this function while waking up from CPU 236 * OFF or DORMANT state. Physical address of the function is 237 * stored in the SAR RAM while entering to OFF or DORMANT mode. 238 * The restore function pointer is stored at CPUx_WAKEUP_NS_PA_ADDR_OFFSET. 239 */ 240ENTRY(omap4_cpu_resume) 241 /* 242 * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. 243 * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA 244 * init and for CPU1, a secure PPA API provided. CPU0 must be ON 245 * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. 246 * OMAP443X GP devices- SMP bit isn't accessible. 247 * OMAP446X GP devices - SMP bit access is enabled on both CPUs. 248 */ 249 ldr r8, =OMAP44XX_SAR_RAM_BASE 250 ldr r9, [r8, #OMAP_TYPE_OFFSET] 251 cmp r9, #0x1 @ Skip if GP device 252 bne skip_ns_smp_enable 253 mrc p15, 0, r0, c0, c0, 5 254 ands r0, r0, #0x0f 255 beq skip_ns_smp_enable 256ppa_actrl_retry: 257 mov r0, #OMAP4_PPA_CPU_ACTRL_SMP_INDEX 258 adr r1, ppa_zero_params_offset 259 ldr r3, [r1] 260 add r3, r3, r1 @ Pointer to ppa_zero_params 261 mov r1, #0x0 @ Process ID 262 mov r2, #0x4 @ Flag 263 mov r6, #0xff 264 mov r12, #0x00 @ Secure Service ID 265 DO_SMC 266 cmp r0, #0x0 @ API returns 0 on success. 267 beq enable_smp_bit 268 b ppa_actrl_retry 269enable_smp_bit: 270 mrc p15, 0, r0, c1, c0, 1 271 tst r0, #(1 << 6) @ Check SMP bit enabled? 272 orreq r0, r0, #(1 << 6) 273 mcreq p15, 0, r0, c1, c0, 1 274 isb 275skip_ns_smp_enable: 276#ifdef CONFIG_CACHE_L2X0 277 /* 278 * Restore the L2 AUXCTRL and enable the L2 cache. 279 * OMAP4_MON_L2X0_AUXCTRL_INDEX = Program the L2X0 AUXCTRL 280 * OMAP4_MON_L2X0_CTRL_INDEX = Enable the L2 using L2X0 CTRL 281 * register r0 contains value to be programmed. 282 * L2 cache is already invalidate by ROM code as part 283 * of MPUSS OFF wakeup path. 284 */ 285 ldr r2, =OMAP44XX_L2CACHE_BASE 286 ldr r0, [r2, #L2X0_CTRL] 287 and r0, #0x0f 288 cmp r0, #1 289 beq skip_l2en @ Skip if already enabled 290 ldr r3, =OMAP44XX_SAR_RAM_BASE 291 ldr r1, [r3, #OMAP_TYPE_OFFSET] 292 cmp r1, #0x1 @ Check for HS device 293 bne set_gp_por 294 ldr r0, =OMAP4_PPA_L2_POR_INDEX 295 ldr r1, =OMAP44XX_SAR_RAM_BASE 296 ldr r4, [r1, #L2X0_PREFETCH_CTRL_OFFSET] 297 adr r1, ppa_por_params_offset 298 ldr r3, [r1] 299 add r3, r3, r1 @ Pointer to ppa_por_params 300 str r4, [r3, #0x04] 301 mov r1, #0x0 @ Process ID 302 mov r2, #0x4 @ Flag 303 mov r6, #0xff 304 mov r12, #0x00 @ Secure Service ID 305 DO_SMC 306 b set_aux_ctrl 307set_gp_por: 308 ldr r1, =OMAP44XX_SAR_RAM_BASE 309 ldr r0, [r1, #L2X0_PREFETCH_CTRL_OFFSET] 310 ldr r12, =OMAP4_MON_L2X0_PREFETCH_INDEX @ Setup L2 PREFETCH 311 DO_SMC 312set_aux_ctrl: 313 ldr r1, =OMAP44XX_SAR_RAM_BASE 314 ldr r0, [r1, #L2X0_AUXCTRL_OFFSET] 315 ldr r12, =OMAP4_MON_L2X0_AUXCTRL_INDEX @ Setup L2 AUXCTRL 316 DO_SMC 317 mov r0, #0x1 318 ldr r12, =OMAP4_MON_L2X0_CTRL_INDEX @ Enable L2 cache 319 DO_SMC 320skip_l2en: 321#endif 322 323 b cpu_resume @ Jump to generic resume 324ppa_por_params_offset: 325 .long ppa_por_params - . 326ENDPROC(omap4_cpu_resume) 327#endif /* CONFIG_ARCH_OMAP4 */ 328 329#endif /* defined(CONFIG_SMP) && defined(CONFIG_PM) */ 330 331ENTRY(omap_do_wfi) 332 stmfd sp!, {lr} 333#ifdef CONFIG_OMAP_INTERCONNECT_BARRIER 334 /* Drain interconnect write buffers. */ 335 bl omap_interconnect_sync 336#endif 337 338 /* 339 * Execute an ISB instruction to ensure that all of the 340 * CP15 register changes have been committed. 341 */ 342 isb 343 344 /* 345 * Execute a barrier instruction to ensure that all cache, 346 * TLB and branch predictor maintenance operations issued 347 * by any CPU in the cluster have completed. 348 */ 349 dsb 350 dmb 351 352 /* 353 * Execute a WFI instruction and wait until the 354 * STANDBYWFI output is asserted to indicate that the 355 * CPU is in idle and low power state. CPU can specualatively 356 * prefetch the instructions so add NOPs after WFI. Sixteen 357 * NOPs as per Cortex-A9 pipeline. 358 */ 359 wfi @ Wait For Interrupt 360 nop 361 nop 362 nop 363 nop 364 nop 365 nop 366 nop 367 nop 368 nop 369 nop 370 nop 371 nop 372 nop 373 nop 374 nop 375 nop 376 377 ldmfd sp!, {pc} 378ppa_zero_params_offset: 379 .long ppa_zero_params - . 380ENDPROC(omap_do_wfi) 381 382 .data 383 .align 2 384ppa_zero_params: 385 .word 0 386 387ppa_por_params: 388 .word 1, 0 389