1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * (C) Copyright 2007
4 * Texas Instruments
5 * Karthik Dasu <karthik-dp@ti.com>
6 *
7 * (C) Copyright 2004
8 * Texas Instruments, <www.ti.com>
9 * Richard Woodruff <r-woodruff2@ti.com>
10 */
11 #include <linux/linkage.h>
12
13 #include <asm/assembler.h>
14
15 #include "omap34xx.h"
16 #include "iomap.h"
17 #include "cm3xxx.h"
18 #include "prm3xxx.h"
19 #include "sdrc.h"
20 #include "sram.h"
21 #include "control.h"
22
23 /*
24 * Registers access definitions
25 */
26 #define SDRC_SCRATCHPAD_SEM_OFFS 0xc
27 #define SDRC_SCRATCHPAD_SEM_V OMAP343X_SCRATCHPAD_REGADDR\
28 (SDRC_SCRATCHPAD_SEM_OFFS)
29 #define PM_PREPWSTST_CORE_P OMAP3430_PRM_BASE + CORE_MOD +\
30 OMAP3430_PM_PREPWSTST
31 #define PM_PWSTCTRL_MPU_P OMAP3430_PRM_BASE + MPU_MOD + OMAP2_PM_PWSTCTRL
32 #define CM_IDLEST1_CORE_V OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST1)
33 #define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
34 #define SRAM_BASE_P OMAP3_SRAM_PA
35 #define CONTROL_STAT OMAP343X_CTRL_BASE + OMAP343X_CONTROL_STATUS
36 #define CONTROL_MEM_RTA_CTRL (OMAP343X_CTRL_BASE +\
37 OMAP36XX_CONTROL_MEM_RTA_CTRL)
38
39 /* Move this as correct place is available */
40 #define SCRATCHPAD_MEM_OFFS 0x310
41 #define SCRATCHPAD_BASE_P (OMAP343X_CTRL_BASE +\
42 OMAP343X_CONTROL_MEM_WKUP +\
43 SCRATCHPAD_MEM_OFFS)
44 #define SDRC_POWER_V OMAP34XX_SDRC_REGADDR(SDRC_POWER)
45 #define SDRC_SYSCONFIG_P (OMAP343X_SDRC_BASE + SDRC_SYSCONFIG)
46 #define SDRC_MR_0_P (OMAP343X_SDRC_BASE + SDRC_MR_0)
47 #define SDRC_EMR2_0_P (OMAP343X_SDRC_BASE + SDRC_EMR2_0)
48 #define SDRC_MANUAL_0_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_0)
49 #define SDRC_MR_1_P (OMAP343X_SDRC_BASE + SDRC_MR_1)
50 #define SDRC_EMR2_1_P (OMAP343X_SDRC_BASE + SDRC_EMR2_1)
51 #define SDRC_MANUAL_1_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_1)
52 #define SDRC_DLLA_STATUS_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
53 #define SDRC_DLLA_CTRL_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
54
55 /*
56 * This file needs be built unconditionally as ARM to interoperate correctly
57 * with non-Thumb-2-capable firmware.
58 */
59 .arm
60
61 /*
62 * API functions
63 */
64
65 .text
66 /*
67 * L2 cache needs to be toggled for stable OFF mode functionality on 3630.
68 * This function sets up a flag that will allow for this toggling to take
69 * place on 3630. Hopefully some version in the future may not need this.
70 */
71 ENTRY(enable_omap3630_toggle_l2_on_restore)
72 stmfd sp!, {lr} @ save registers on stack
73 /* Setup so that we will disable and enable l2 */
74 mov r1, #0x1
75 adr r3, l2dis_3630_offset
76 ldr r2, [r3] @ value for offset
77 str r1, [r2, r3] @ write to l2dis_3630
78 ldmfd sp!, {pc} @ restore regs and return
79 ENDPROC(enable_omap3630_toggle_l2_on_restore)
80
81 /*
82 * Function to call rom code to save secure ram context.
83 *
84 * r0 = physical address of the parameters
85 */
86 .arch armv7-a
87 .arch_extension sec
88 ENTRY(save_secure_ram_context)
89 stmfd sp!, {r4 - r11, lr} @ save registers on stack
90 mov r3, r0 @ physical address of parameters
91 mov r0, #25 @ set service ID for PPA
92 mov r12, r0 @ copy secure service ID in r12
93 mov r1, #0 @ set task id for ROM code in r1
94 mov r2, #4 @ set some flags in r2, r6
95 mov r6, #0xff
96 dsb @ data write barrier
97 dmb @ data memory barrier
98 smc #1 @ call SMI monitor (smi #1)
99 nop
100 nop
101 nop
102 nop
103 ldmfd sp!, {r4 - r11, pc}
104 ENDPROC(save_secure_ram_context)
105
106 /*
107 * ======================
108 * == Idle entry point ==
109 * ======================
110 */
111
112 /*
113 * Forces OMAP into idle state
114 *
115 * omap34xx_cpu_suspend() - This bit of code saves the CPU context if needed
116 * and executes the WFI instruction. Calling WFI effectively changes the
117 * power domains states to the desired target power states.
118 *
119 *
120 * Notes:
121 * - only the minimum set of functions gets copied to internal SRAM at boot
122 * and after wake-up from OFF mode, cf. omap_push_sram_idle. The function
123 * pointers in SDRAM or SRAM are called depending on the desired low power
124 * target state.
125 * - when the OMAP wakes up it continues at different execution points
126 * depending on the low power mode (non-OFF vs OFF modes),
127 * cf. 'Resume path for xxx mode' comments.
128 */
129 .align 3
130 ENTRY(omap34xx_cpu_suspend)
131 stmfd sp!, {r4 - r11, lr} @ save registers on stack
132
133 /*
134 * r0 contains information about saving context:
135 * 0 - No context lost
136 * 1 - Only L1 and logic lost
137 * 2 - Only L2 lost (Even L1 is retained we clean it along with L2)
138 * 3 - Both L1 and L2 lost and logic lost
139 */
140
141 /*
142 * For OFF mode: save context and jump to WFI in SDRAM (omap3_do_wfi)
143 * For non-OFF modes: jump to the WFI code in SRAM (omap3_do_wfi_sram)
144 */
145 ldr r4, omap3_do_wfi_sram_addr
146 ldr r5, [r4]
147 cmp r0, #0x0 @ If no context save required,
148 bxeq r5 @ jump to the WFI code in SRAM
149
150
151 /* Otherwise fall through to the save context code */
152 save_context_wfi:
153 /*
154 * jump out to kernel flush routine
155 * - reuse that code is better
156 * - it executes in a cached space so is faster than refetch per-block
157 * - should be faster and will change with kernel
158 * - 'might' have to copy address, load and jump to it
159 * Flush all data from the L1 data cache before disabling
160 * SCTLR.C bit.
161 */
162 ldr r1, kernel_flush
163 mov lr, pc
164 bx r1
165
166 /*
167 * Clear the SCTLR.C bit to prevent further data cache
168 * allocation. Clearing SCTLR.C would make all the data accesses
169 * strongly ordered and would not hit the cache.
170 */
171 mrc p15, 0, r0, c1, c0, 0
172 bic r0, r0, #(1 << 2) @ Disable the C bit
173 mcr p15, 0, r0, c1, c0, 0
174 isb
175
176 /*
177 * Invalidate L1 data cache. Even though only invalidate is
178 * necessary exported flush API is used here. Doing clean
179 * on already clean cache would be almost NOP.
180 */
181 ldr r1, kernel_flush
182 blx r1
183 b omap3_do_wfi
184 ENDPROC(omap34xx_cpu_suspend)
185 omap3_do_wfi_sram_addr:
186 .word omap3_do_wfi_sram
187 kernel_flush:
188 .word v7_flush_dcache_all
189
190 /* ===================================
191 * == WFI instruction => Enter idle ==
192 * ===================================
193 */
194
195 /*
196 * Do WFI instruction
197 * Includes the resume path for non-OFF modes
198 *
199 * This code gets copied to internal SRAM and is accessible
200 * from both SDRAM and SRAM:
201 * - executed from SRAM for non-off modes (omap3_do_wfi_sram),
202 * - executed from SDRAM for OFF mode (omap3_do_wfi).
203 */
204 .align 3
205 ENTRY(omap3_do_wfi)
206 ldr r4, sdrc_power @ read the SDRC_POWER register
207 ldr r5, [r4] @ read the contents of SDRC_POWER
208 orr r5, r5, #0x40 @ enable self refresh on idle req
209 str r5, [r4] @ write back to SDRC_POWER register
210
211 /* Data memory barrier and Data sync barrier */
212 dsb
213 dmb
214
215 /*
216 * ===================================
217 * == WFI instruction => Enter idle ==
218 * ===================================
219 */
220 wfi @ wait for interrupt
221
222 /*
223 * ===================================
224 * == Resume path for non-OFF modes ==
225 * ===================================
226 */
227 nop
228 nop
229 nop
230 nop
231 nop
232 nop
233 nop
234 nop
235 nop
236 nop
237
238 /*
239 * This function implements the erratum ID i581 WA:
240 * SDRC state restore before accessing the SDRAM
241 *
242 * Only used at return from non-OFF mode. For OFF
243 * mode the ROM code configures the SDRC and
244 * the DPLL before calling the restore code directly
245 * from DDR.
246 */
247
248 /* Make sure SDRC accesses are ok */
249 wait_sdrc_ok:
250
251 /* DPLL3 must be locked before accessing the SDRC. Maybe the HW ensures this */
252 ldr r4, cm_idlest_ckgen
253 wait_dpll3_lock:
254 ldr r5, [r4]
255 tst r5, #1
256 beq wait_dpll3_lock
257
258 ldr r4, cm_idlest1_core
259 wait_sdrc_ready:
260 ldr r5, [r4]
261 tst r5, #0x2
262 bne wait_sdrc_ready
263 /* allow DLL powerdown upon hw idle req */
264 ldr r4, sdrc_power
265 ldr r5, [r4]
266 bic r5, r5, #0x40
267 str r5, [r4]
268
269 is_dll_in_lock_mode:
270 /* Is dll in lock mode? */
271 ldr r4, sdrc_dlla_ctrl
272 ldr r5, [r4]
273 tst r5, #0x4
274 bne exit_nonoff_modes @ Return if locked
275 /* wait till dll locks */
276 wait_dll_lock_timed:
277 ldr r4, sdrc_dlla_status
278 /* Wait 20uS for lock */
279 mov r6, #8
280 wait_dll_lock:
281 subs r6, r6, #0x1
282 beq kick_dll
283 ldr r5, [r4]
284 and r5, r5, #0x4
285 cmp r5, #0x4
286 bne wait_dll_lock
287 b exit_nonoff_modes @ Return when locked
288
289 /* disable/reenable DLL if not locked */
290 kick_dll:
291 ldr r4, sdrc_dlla_ctrl
292 ldr r5, [r4]
293 mov r6, r5
294 bic r6, #(1<<3) @ disable dll
295 str r6, [r4]
296 dsb
297 orr r6, r6, #(1<<3) @ enable dll
298 str r6, [r4]
299 dsb
300 b wait_dll_lock_timed
301
302 exit_nonoff_modes:
303 /* Re-enable C-bit if needed */
304 mrc p15, 0, r0, c1, c0, 0
305 tst r0, #(1 << 2) @ Check C bit enabled?
306 orreq r0, r0, #(1 << 2) @ Enable the C bit if cleared
307 mcreq p15, 0, r0, c1, c0, 0
308 isb
309
310 /*
311 * ===================================
312 * == Exit point from non-OFF modes ==
313 * ===================================
314 */
315 ldmfd sp!, {r4 - r11, pc} @ restore regs and return
316 ENDPROC(omap3_do_wfi)
317 sdrc_power:
318 .word SDRC_POWER_V
319 cm_idlest1_core:
320 .word CM_IDLEST1_CORE_V
321 cm_idlest_ckgen:
322 .word CM_IDLEST_CKGEN_V
323 sdrc_dlla_status:
324 .word SDRC_DLLA_STATUS_V
325 sdrc_dlla_ctrl:
326 .word SDRC_DLLA_CTRL_V
327 ENTRY(omap3_do_wfi_sz)
328 .word . - omap3_do_wfi
329
330
331 /*
332 * ==============================
333 * == Resume path for OFF mode ==
334 * ==============================
335 */
336
337 /*
338 * The restore_* functions are called by the ROM code
339 * when back from WFI in OFF mode.
340 * Cf. the get_*restore_pointer functions.
341 *
342 * restore_es3: applies to 34xx >= ES3.0
343 * restore_3630: applies to 36xx
344 * restore: common code for 3xxx
345 *
346 * Note: when back from CORE and MPU OFF mode we are running
347 * from SDRAM, without MMU, without the caches and prediction.
348 * Also the SRAM content has been cleared.
349 */
350 ENTRY(omap3_restore_es3)
351 ldr r5, pm_prepwstst_core_p
352 ldr r4, [r5]
353 and r4, r4, #0x3
354 cmp r4, #0x0 @ Check if previous power state of CORE is OFF
355 bne omap3_restore @ Fall through to OMAP3 common code
356 adr r0, es3_sdrc_fix
357 ldr r1, sram_base
358 ldr r2, es3_sdrc_fix_sz
359 mov r2, r2, ror #2
360 copy_to_sram:
361 ldmia r0!, {r3} @ val = *src
362 stmia r1!, {r3} @ *dst = val
363 subs r2, r2, #0x1 @ num_words--
364 bne copy_to_sram
365 ldr r1, sram_base
366 blx r1
367 b omap3_restore @ Fall through to OMAP3 common code
368 ENDPROC(omap3_restore_es3)
369
370 ENTRY(omap3_restore_3630)
371 ldr r1, pm_prepwstst_core_p
372 ldr r2, [r1]
373 and r2, r2, #0x3
374 cmp r2, #0x0 @ Check if previous power state of CORE is OFF
375 bne omap3_restore @ Fall through to OMAP3 common code
376 /* Disable RTA before giving control */
377 ldr r1, control_mem_rta
378 mov r2, #OMAP36XX_RTA_DISABLE
379 str r2, [r1]
380 ENDPROC(omap3_restore_3630)
381
382 /* Fall through to common code for the remaining logic */
383
384 ENTRY(omap3_restore)
385 /*
386 * Read the pwstctrl register to check the reason for mpu reset.
387 * This tells us what was lost.
388 */
389 ldr r1, pm_pwstctrl_mpu
390 ldr r2, [r1]
391 and r2, r2, #0x3
392 cmp r2, #0x0 @ Check if target power state was OFF or RET
393 bne logic_l1_restore
394
395 adr r1, l2dis_3630_offset @ address for offset
396 ldr r0, [r1] @ value for offset
397 ldr r0, [r1, r0] @ value at l2dis_3630
398 cmp r0, #0x1 @ should we disable L2 on 3630?
399 bne skipl2dis
400 mrc p15, 0, r0, c1, c0, 1
401 bic r0, r0, #2 @ disable L2 cache
402 mcr p15, 0, r0, c1, c0, 1
403 skipl2dis:
404 ldr r0, control_stat
405 ldr r1, [r0]
406 and r1, #0x700
407 cmp r1, #0x300
408 beq l2_inv_gp
409 adr r0, l2_inv_api_params_offset
410 ldr r3, [r0]
411 add r3, r3, r0 @ r3 points to dummy parameters
412 mov r0, #40 @ set service ID for PPA
413 mov r12, r0 @ copy secure Service ID in r12
414 mov r1, #0 @ set task id for ROM code in r1
415 mov r2, #4 @ set some flags in r2, r6
416 mov r6, #0xff
417 dsb @ data write barrier
418 dmb @ data memory barrier
419 smc #1 @ call SMI monitor (smi #1)
420 /* Write to Aux control register to set some bits */
421 mov r0, #42 @ set service ID for PPA
422 mov r12, r0 @ copy secure Service ID in r12
423 mov r1, #0 @ set task id for ROM code in r1
424 mov r2, #4 @ set some flags in r2, r6
425 mov r6, #0xff
426 ldr r4, scratchpad_base
427 ldr r3, [r4, #0xBC] @ r3 points to parameters
428 dsb @ data write barrier
429 dmb @ data memory barrier
430 smc #1 @ call SMI monitor (smi #1)
431
432 #ifdef CONFIG_OMAP3_L2_AUX_SECURE_SAVE_RESTORE
433 /* Restore L2 aux control register */
434 @ set service ID for PPA
435 mov r0, #CONFIG_OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
436 mov r12, r0 @ copy service ID in r12
437 mov r1, #0 @ set task ID for ROM code in r1
438 mov r2, #4 @ set some flags in r2, r6
439 mov r6, #0xff
440 ldr r4, scratchpad_base
441 ldr r3, [r4, #0xBC]
442 adds r3, r3, #8 @ r3 points to parameters
443 dsb @ data write barrier
444 dmb @ data memory barrier
445 smc #1 @ call SMI monitor (smi #1)
446 #endif
447 b logic_l1_restore
448
449 .align
450 l2_inv_api_params_offset:
451 .long l2_inv_api_params - .
452 l2_inv_gp:
453 /* Execute smi to invalidate L2 cache */
454 mov r12, #0x1 @ set up to invalidate L2
455 smc #0 @ Call SMI monitor (smieq)
456 /* Write to Aux control register to set some bits */
457 ldr r4, scratchpad_base
458 ldr r3, [r4,#0xBC]
459 ldr r0, [r3,#4]
460 mov r12, #0x3
461 smc #0 @ Call SMI monitor (smieq)
462 ldr r4, scratchpad_base
463 ldr r3, [r4,#0xBC]
464 ldr r0, [r3,#12]
465 mov r12, #0x2
466 smc #0 @ Call SMI monitor (smieq)
467 logic_l1_restore:
468 adr r0, l2dis_3630_offset @ address for offset
469 ldr r1, [r0] @ value for offset
470 ldr r1, [r0, r1] @ value at l2dis_3630
471 cmp r1, #0x1 @ Test if L2 re-enable needed on 3630
472 bne skipl2reen
473 mrc p15, 0, r1, c1, c0, 1
474 orr r1, r1, #2 @ re-enable L2 cache
475 mcr p15, 0, r1, c1, c0, 1
476 skipl2reen:
477
478 /* Now branch to the common CPU resume function */
479 b cpu_resume
480 ENDPROC(omap3_restore)
481
482 .ltorg
483
484 /*
485 * Local variables
486 */
487 pm_prepwstst_core_p:
488 .word PM_PREPWSTST_CORE_P
489 pm_pwstctrl_mpu:
490 .word PM_PWSTCTRL_MPU_P
491 scratchpad_base:
492 .word SCRATCHPAD_BASE_P
493 sram_base:
494 .word SRAM_BASE_P + 0x8000
495 control_stat:
496 .word CONTROL_STAT
497 control_mem_rta:
498 .word CONTROL_MEM_RTA_CTRL
499 l2dis_3630_offset:
500 .long l2dis_3630 - .
501
502 .data
503 .align 2
504 l2dis_3630:
505 .word 0
506
507 .data
508 .align 2
509 l2_inv_api_params:
510 .word 0x1, 0x00
511
512 /*
513 * Internal functions
514 */
515
516 /*
517 * This function implements the erratum ID i443 WA, applies to 34xx >= ES3.0
518 * Copied to and run from SRAM in order to reconfigure the SDRC parameters.
519 */
520 .text
521 .align 3
522 ENTRY(es3_sdrc_fix)
523 ldr r4, sdrc_syscfg @ get config addr
524 ldr r5, [r4] @ get value
525 tst r5, #0x100 @ is part access blocked
526 it eq
527 biceq r5, r5, #0x100 @ clear bit if set
528 str r5, [r4] @ write back change
529 ldr r4, sdrc_mr_0 @ get config addr
530 ldr r5, [r4] @ get value
531 str r5, [r4] @ write back change
532 ldr r4, sdrc_emr2_0 @ get config addr
533 ldr r5, [r4] @ get value
534 str r5, [r4] @ write back change
535 ldr r4, sdrc_manual_0 @ get config addr
536 mov r5, #0x2 @ autorefresh command
537 str r5, [r4] @ kick off refreshes
538 ldr r4, sdrc_mr_1 @ get config addr
539 ldr r5, [r4] @ get value
540 str r5, [r4] @ write back change
541 ldr r4, sdrc_emr2_1 @ get config addr
542 ldr r5, [r4] @ get value
543 str r5, [r4] @ write back change
544 ldr r4, sdrc_manual_1 @ get config addr
545 mov r5, #0x2 @ autorefresh command
546 str r5, [r4] @ kick off refreshes
547 bx lr
548
549 /*
550 * Local variables
551 */
552 .align
553 sdrc_syscfg:
554 .word SDRC_SYSCONFIG_P
555 sdrc_mr_0:
556 .word SDRC_MR_0_P
557 sdrc_emr2_0:
558 .word SDRC_EMR2_0_P
559 sdrc_manual_0:
560 .word SDRC_MANUAL_0_P
561 sdrc_mr_1:
562 .word SDRC_MR_1_P
563 sdrc_emr2_1:
564 .word SDRC_EMR2_1_P
565 sdrc_manual_1:
566 .word SDRC_MANUAL_1_P
567 ENDPROC(es3_sdrc_fix)
568 ENTRY(es3_sdrc_fix_sz)
569 .word . - es3_sdrc_fix
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.