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b2b9762f SS |
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> | |
b2b9762f SS |
13 | #include <asm/smp_scu.h> |
14 | #include <asm/memory.h> | |
15 | #include <asm/hardware/cache-l2x0.h> | |
16 | ||
c1db9d73 | 17 | #include "omap-secure.h" |
b2b9762f SS |
18 | |
19 | #include "common.h" | |
c49f34bc | 20 | #include "omap44xx.h" |
b2b9762f SS |
21 | #include "omap4-sar-layout.h" |
22 | ||
23 | #if defined(CONFIG_SMP) && defined(CONFIG_PM) | |
24 | ||
25 | .macro DO_SMC | |
26 | dsb | |
27 | smc #0 | |
28 | dsb | |
29 | .endm | |
30 | ||
31 | ppa_zero_params: | |
32 | .word 0x0 | |
33 | ||
5e94c6e3 SS |
34 | ppa_por_params: |
35 | .word 1, 0 | |
36 | ||
b2b9762f SS |
37 | /* |
38 | * ============================= | |
39 | * == CPU suspend finisher == | |
40 | * ============================= | |
41 | * | |
42 | * void omap4_finish_suspend(unsigned long cpu_state) | |
43 | * | |
44 | * This function code saves the CPU context and performs the CPU | |
45 | * power down sequence. Calling WFI effectively changes the CPU | |
46 | * power domains states to the desired target power state. | |
47 | * | |
48 | * @cpu_state : contains context save state (r0) | |
49 | * 0 - No context lost | |
50 | * 1 - CPUx L1 and logic lost: MPUSS CSWR | |
51 | * 2 - CPUx L1 and logic lost + GIC lost: MPUSS OSWR | |
52 | * 3 - CPUx L1 and logic lost + GIC + L2 lost: MPUSS OFF | |
53 | * @return: This function never returns for CPU OFF and DORMANT power states. | |
54 | * Post WFI, CPU transitions to DORMANT or OFF power state and on wake-up | |
55 | * from this follows a full CPU reset path via ROM code to CPU restore code. | |
56 | * The restore function pointer is stored at CPUx_WAKEUP_NS_PA_ADDR_OFFSET. | |
57 | * It returns to the caller for CPU INACTIVE and ON power states or in case | |
58 | * CPU failed to transition to targeted OFF/DORMANT state. | |
5b6e3eb5 SS |
59 | * |
60 | * omap4_finish_suspend() calls v7_flush_dcache_all() which doesn't save | |
61 | * stack frame and it expects the caller to take care of it. Hence the entire | |
62 | * stack frame is saved to avoid possible stack corruption. | |
b2b9762f SS |
63 | */ |
64 | ENTRY(omap4_finish_suspend) | |
5b6e3eb5 | 65 | stmfd sp!, {r4-r12, lr} |
b2b9762f SS |
66 | cmp r0, #0x0 |
67 | beq do_WFI @ No lowpower state, jump to WFI | |
68 | ||
69 | /* | |
70 | * Flush all data from the L1 data cache before disabling | |
71 | * SCTLR.C bit. | |
72 | */ | |
73 | bl omap4_get_sar_ram_base | |
74 | ldr r9, [r0, #OMAP_TYPE_OFFSET] | |
75 | cmp r9, #0x1 @ Check for HS device | |
76 | bne skip_secure_l1_clean | |
77 | mov r0, #SCU_PM_NORMAL | |
78 | mov r1, #0xFF @ clean seucre L1 | |
79 | stmfd r13!, {r4-r12, r14} | |
80 | ldr r12, =OMAP4_MON_SCU_PWR_INDEX | |
81 | DO_SMC | |
82 | ldmfd r13!, {r4-r12, r14} | |
83 | skip_secure_l1_clean: | |
84 | bl v7_flush_dcache_all | |
85 | ||
86 | /* | |
87 | * Clear the SCTLR.C bit to prevent further data cache | |
88 | * allocation. Clearing SCTLR.C would make all the data accesses | |
89 | * strongly ordered and would not hit the cache. | |
90 | */ | |
91 | mrc p15, 0, r0, c1, c0, 0 | |
92 | bic r0, r0, #(1 << 2) @ Disable the C bit | |
93 | mcr p15, 0, r0, c1, c0, 0 | |
94 | isb | |
95 | ||
96 | /* | |
97 | * Invalidate L1 data cache. Even though only invalidate is | |
98 | * necessary exported flush API is used here. Doing clean | |
99 | * on already clean cache would be almost NOP. | |
100 | */ | |
101 | bl v7_flush_dcache_all | |
102 | ||
103 | /* | |
104 | * Switch the CPU from Symmetric Multiprocessing (SMP) mode | |
105 | * to AsymmetricMultiprocessing (AMP) mode by programming | |
106 | * the SCU power status to DORMANT or OFF mode. | |
107 | * This enables the CPU to be taken out of coherency by | |
108 | * preventing the CPU from receiving cache, TLB, or BTB | |
109 | * maintenance operations broadcast by other CPUs in the cluster. | |
110 | */ | |
111 | bl omap4_get_sar_ram_base | |
112 | mov r8, r0 | |
113 | ldr r9, [r8, #OMAP_TYPE_OFFSET] | |
114 | cmp r9, #0x1 @ Check for HS device | |
115 | bne scu_gp_set | |
116 | mrc p15, 0, r0, c0, c0, 5 @ Read MPIDR | |
117 | ands r0, r0, #0x0f | |
118 | ldreq r0, [r8, #SCU_OFFSET0] | |
119 | ldrne r0, [r8, #SCU_OFFSET1] | |
120 | mov r1, #0x00 | |
121 | stmfd r13!, {r4-r12, r14} | |
122 | ldr r12, =OMAP4_MON_SCU_PWR_INDEX | |
123 | DO_SMC | |
124 | ldmfd r13!, {r4-r12, r14} | |
125 | b skip_scu_gp_set | |
126 | scu_gp_set: | |
127 | mrc p15, 0, r0, c0, c0, 5 @ Read MPIDR | |
128 | ands r0, r0, #0x0f | |
129 | ldreq r1, [r8, #SCU_OFFSET0] | |
130 | ldrne r1, [r8, #SCU_OFFSET1] | |
131 | bl omap4_get_scu_base | |
132 | bl scu_power_mode | |
133 | skip_scu_gp_set: | |
134 | mrc p15, 0, r0, c1, c1, 2 @ Read NSACR data | |
135 | tst r0, #(1 << 18) | |
136 | mrcne p15, 0, r0, c1, c0, 1 | |
137 | bicne r0, r0, #(1 << 6) @ Disable SMP bit | |
138 | mcrne p15, 0, r0, c1, c0, 1 | |
139 | isb | |
140 | dsb | |
5e94c6e3 SS |
141 | #ifdef CONFIG_CACHE_L2X0 |
142 | /* | |
143 | * Clean and invalidate the L2 cache. | |
144 | * Common cache-l2x0.c functions can't be used here since it | |
145 | * uses spinlocks. We are out of coherency here with data cache | |
146 | * disabled. The spinlock implementation uses exclusive load/store | |
147 | * instruction which can fail without data cache being enabled. | |
148 | * OMAP4 hardware doesn't support exclusive monitor which can | |
149 | * overcome exclusive access issue. Because of this, CPU can | |
150 | * lead to deadlock. | |
151 | */ | |
152 | bl omap4_get_sar_ram_base | |
153 | mov r8, r0 | |
154 | mrc p15, 0, r5, c0, c0, 5 @ Read MPIDR | |
155 | ands r5, r5, #0x0f | |
156 | ldreq r0, [r8, #L2X0_SAVE_OFFSET0] @ Retrieve L2 state from SAR | |
157 | ldrne r0, [r8, #L2X0_SAVE_OFFSET1] @ memory. | |
158 | cmp r0, #3 | |
159 | bne do_WFI | |
160 | #ifdef CONFIG_PL310_ERRATA_727915 | |
161 | mov r0, #0x03 | |
162 | mov r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX | |
163 | DO_SMC | |
164 | #endif | |
165 | bl omap4_get_l2cache_base | |
166 | mov r2, r0 | |
167 | ldr r0, =0xffff | |
168 | str r0, [r2, #L2X0_CLEAN_INV_WAY] | |
169 | wait: | |
170 | ldr r0, [r2, #L2X0_CLEAN_INV_WAY] | |
171 | ldr r1, =0xffff | |
172 | ands r0, r0, r1 | |
173 | bne wait | |
174 | #ifdef CONFIG_PL310_ERRATA_727915 | |
175 | mov r0, #0x00 | |
176 | mov r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX | |
177 | DO_SMC | |
178 | #endif | |
179 | l2x_sync: | |
180 | bl omap4_get_l2cache_base | |
181 | mov r2, r0 | |
182 | mov r0, #0x0 | |
183 | str r0, [r2, #L2X0_CACHE_SYNC] | |
184 | sync: | |
185 | ldr r0, [r2, #L2X0_CACHE_SYNC] | |
186 | ands r0, r0, #0x1 | |
187 | bne sync | |
188 | #endif | |
b2b9762f SS |
189 | |
190 | do_WFI: | |
191 | bl omap_do_wfi | |
192 | ||
193 | /* | |
194 | * CPU is here when it failed to enter OFF/DORMANT or | |
195 | * no low power state was attempted. | |
196 | */ | |
197 | mrc p15, 0, r0, c1, c0, 0 | |
198 | tst r0, #(1 << 2) @ Check C bit enabled? | |
199 | orreq r0, r0, #(1 << 2) @ Enable the C bit | |
200 | mcreq p15, 0, r0, c1, c0, 0 | |
201 | isb | |
202 | ||
203 | /* | |
204 | * Ensure the CPU power state is set to NORMAL in | |
205 | * SCU power state so that CPU is back in coherency. | |
206 | * In non-coherent mode CPU can lock-up and lead to | |
207 | * system deadlock. | |
208 | */ | |
209 | mrc p15, 0, r0, c1, c0, 1 | |
210 | tst r0, #(1 << 6) @ Check SMP bit enabled? | |
211 | orreq r0, r0, #(1 << 6) | |
212 | mcreq p15, 0, r0, c1, c0, 1 | |
213 | isb | |
214 | bl omap4_get_sar_ram_base | |
215 | mov r8, r0 | |
216 | ldr r9, [r8, #OMAP_TYPE_OFFSET] | |
217 | cmp r9, #0x1 @ Check for HS device | |
218 | bne scu_gp_clear | |
219 | mov r0, #SCU_PM_NORMAL | |
220 | mov r1, #0x00 | |
221 | stmfd r13!, {r4-r12, r14} | |
222 | ldr r12, =OMAP4_MON_SCU_PWR_INDEX | |
223 | DO_SMC | |
224 | ldmfd r13!, {r4-r12, r14} | |
225 | b skip_scu_gp_clear | |
226 | scu_gp_clear: | |
227 | bl omap4_get_scu_base | |
228 | mov r1, #SCU_PM_NORMAL | |
229 | bl scu_power_mode | |
230 | skip_scu_gp_clear: | |
231 | isb | |
232 | dsb | |
5b6e3eb5 | 233 | ldmfd sp!, {r4-r12, pc} |
b2b9762f SS |
234 | ENDPROC(omap4_finish_suspend) |
235 | ||
236 | /* | |
237 | * ============================ | |
238 | * == CPU resume entry point == | |
239 | * ============================ | |
240 | * | |
241 | * void omap4_cpu_resume(void) | |
242 | * | |
243 | * ROM code jumps to this function while waking up from CPU | |
244 | * OFF or DORMANT state. Physical address of the function is | |
245 | * stored in the SAR RAM while entering to OFF or DORMANT mode. | |
246 | * The restore function pointer is stored at CPUx_WAKEUP_NS_PA_ADDR_OFFSET. | |
247 | */ | |
248 | ENTRY(omap4_cpu_resume) | |
249 | /* | |
250 | * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. | |
251 | * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA | |
252 | * init and for CPU1, a secure PPA API provided. CPU0 must be ON | |
253 | * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. | |
254 | * OMAP443X GP devices- SMP bit isn't accessible. | |
255 | * OMAP446X GP devices - SMP bit access is enabled on both CPUs. | |
256 | */ | |
257 | ldr r8, =OMAP44XX_SAR_RAM_BASE | |
258 | ldr r9, [r8, #OMAP_TYPE_OFFSET] | |
259 | cmp r9, #0x1 @ Skip if GP device | |
260 | bne skip_ns_smp_enable | |
261 | mrc p15, 0, r0, c0, c0, 5 | |
262 | ands r0, r0, #0x0f | |
263 | beq skip_ns_smp_enable | |
264 | ppa_actrl_retry: | |
265 | mov r0, #OMAP4_PPA_CPU_ACTRL_SMP_INDEX | |
266 | adr r3, ppa_zero_params @ Pointer to parameters | |
267 | mov r1, #0x0 @ Process ID | |
268 | mov r2, #0x4 @ Flag | |
269 | mov r6, #0xff | |
270 | mov r12, #0x00 @ Secure Service ID | |
271 | DO_SMC | |
272 | cmp r0, #0x0 @ API returns 0 on success. | |
273 | beq enable_smp_bit | |
274 | b ppa_actrl_retry | |
275 | enable_smp_bit: | |
276 | mrc p15, 0, r0, c1, c0, 1 | |
277 | tst r0, #(1 << 6) @ Check SMP bit enabled? | |
278 | orreq r0, r0, #(1 << 6) | |
279 | mcreq p15, 0, r0, c1, c0, 1 | |
280 | isb | |
281 | skip_ns_smp_enable: | |
5e94c6e3 SS |
282 | #ifdef CONFIG_CACHE_L2X0 |
283 | /* | |
284 | * Restore the L2 AUXCTRL and enable the L2 cache. | |
285 | * OMAP4_MON_L2X0_AUXCTRL_INDEX = Program the L2X0 AUXCTRL | |
286 | * OMAP4_MON_L2X0_CTRL_INDEX = Enable the L2 using L2X0 CTRL | |
287 | * register r0 contains value to be programmed. | |
288 | * L2 cache is already invalidate by ROM code as part | |
289 | * of MPUSS OFF wakeup path. | |
290 | */ | |
291 | ldr r2, =OMAP44XX_L2CACHE_BASE | |
292 | ldr r0, [r2, #L2X0_CTRL] | |
293 | and r0, #0x0f | |
294 | cmp r0, #1 | |
295 | beq skip_l2en @ Skip if already enabled | |
296 | ldr r3, =OMAP44XX_SAR_RAM_BASE | |
297 | ldr r1, [r3, #OMAP_TYPE_OFFSET] | |
298 | cmp r1, #0x1 @ Check for HS device | |
299 | bne set_gp_por | |
300 | ldr r0, =OMAP4_PPA_L2_POR_INDEX | |
301 | ldr r1, =OMAP44XX_SAR_RAM_BASE | |
302 | ldr r4, [r1, #L2X0_PREFETCH_CTRL_OFFSET] | |
303 | adr r3, ppa_por_params | |
304 | str r4, [r3, #0x04] | |
305 | mov r1, #0x0 @ Process ID | |
306 | mov r2, #0x4 @ Flag | |
307 | mov r6, #0xff | |
308 | mov r12, #0x00 @ Secure Service ID | |
309 | DO_SMC | |
310 | b set_aux_ctrl | |
311 | set_gp_por: | |
312 | ldr r1, =OMAP44XX_SAR_RAM_BASE | |
313 | ldr r0, [r1, #L2X0_PREFETCH_CTRL_OFFSET] | |
314 | ldr r12, =OMAP4_MON_L2X0_PREFETCH_INDEX @ Setup L2 PREFETCH | |
315 | DO_SMC | |
316 | set_aux_ctrl: | |
317 | ldr r1, =OMAP44XX_SAR_RAM_BASE | |
318 | ldr r0, [r1, #L2X0_AUXCTRL_OFFSET] | |
319 | ldr r12, =OMAP4_MON_L2X0_AUXCTRL_INDEX @ Setup L2 AUXCTRL | |
320 | DO_SMC | |
321 | mov r0, #0x1 | |
322 | ldr r12, =OMAP4_MON_L2X0_CTRL_INDEX @ Enable L2 cache | |
323 | DO_SMC | |
324 | skip_l2en: | |
325 | #endif | |
b2b9762f SS |
326 | |
327 | b cpu_resume @ Jump to generic resume | |
328 | ENDPROC(omap4_cpu_resume) | |
329 | #endif | |
330 | ||
137d105d SS |
331 | #ifndef CONFIG_OMAP4_ERRATA_I688 |
332 | ENTRY(omap_bus_sync) | |
333 | mov pc, lr | |
334 | ENDPROC(omap_bus_sync) | |
335 | #endif | |
336 | ||
b2b9762f SS |
337 | ENTRY(omap_do_wfi) |
338 | stmfd sp!, {lr} | |
137d105d SS |
339 | /* Drain interconnect write buffers. */ |
340 | bl omap_bus_sync | |
b2b9762f SS |
341 | |
342 | /* | |
343 | * Execute an ISB instruction to ensure that all of the | |
344 | * CP15 register changes have been committed. | |
345 | */ | |
346 | isb | |
347 | ||
348 | /* | |
349 | * Execute a barrier instruction to ensure that all cache, | |
350 | * TLB and branch predictor maintenance operations issued | |
351 | * by any CPU in the cluster have completed. | |
352 | */ | |
353 | dsb | |
354 | dmb | |
355 | ||
356 | /* | |
357 | * Execute a WFI instruction and wait until the | |
358 | * STANDBYWFI output is asserted to indicate that the | |
359 | * CPU is in idle and low power state. CPU can specualatively | |
360 | * prefetch the instructions so add NOPs after WFI. Sixteen | |
361 | * NOPs as per Cortex-A9 pipeline. | |
362 | */ | |
363 | wfi @ Wait For Interrupt | |
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 | nop | |
377 | nop | |
378 | nop | |
379 | nop | |
380 | ||
381 | ldmfd sp!, {pc} | |
382 | ENDPROC(omap_do_wfi) |