4 * Karthik Dasu <karthik-dp@ti.com>
7 * Texas Instruments, <www.ti.com>
8 * Richard Woodruff <r-woodruff2@ti.com>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <linux/linkage.h>
26 #include <asm/assembler.h>
27 #include <plat/sram.h>
30 #include "cm2xxx_3xxx.h"
31 #include "prm2xxx_3xxx.h"
36 * Registers access definitions
38 #define SDRC_SCRATCHPAD_SEM_OFFS 0xc
39 #define SDRC_SCRATCHPAD_SEM_V OMAP343X_SCRATCHPAD_REGADDR\
40 (SDRC_SCRATCHPAD_SEM_OFFS)
41 #define PM_PREPWSTST_CORE_P OMAP3430_PRM_BASE + CORE_MOD +\
43 #define PM_PWSTCTRL_MPU_P OMAP3430_PRM_BASE + MPU_MOD + OMAP2_PM_PWSTCTRL
44 #define CM_IDLEST1_CORE_V OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST1)
45 #define CM_IDLEST_CKGEN_V OMAP34XX_CM_REGADDR(PLL_MOD, CM_IDLEST)
46 #define SRAM_BASE_P OMAP3_SRAM_PA
47 #define CONTROL_STAT OMAP343X_CTRL_BASE + OMAP343X_CONTROL_STATUS
48 #define CONTROL_MEM_RTA_CTRL (OMAP343X_CTRL_BASE +\
49 OMAP36XX_CONTROL_MEM_RTA_CTRL)
51 /* Move this as correct place is available */
52 #define SCRATCHPAD_MEM_OFFS 0x310
53 #define SCRATCHPAD_BASE_P (OMAP343X_CTRL_BASE +\
54 OMAP343X_CONTROL_MEM_WKUP +\
56 #define SDRC_POWER_V OMAP34XX_SDRC_REGADDR(SDRC_POWER)
57 #define SDRC_SYSCONFIG_P (OMAP343X_SDRC_BASE + SDRC_SYSCONFIG)
58 #define SDRC_MR_0_P (OMAP343X_SDRC_BASE + SDRC_MR_0)
59 #define SDRC_EMR2_0_P (OMAP343X_SDRC_BASE + SDRC_EMR2_0)
60 #define SDRC_MANUAL_0_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_0)
61 #define SDRC_MR_1_P (OMAP343X_SDRC_BASE + SDRC_MR_1)
62 #define SDRC_EMR2_1_P (OMAP343X_SDRC_BASE + SDRC_EMR2_1)
63 #define SDRC_MANUAL_1_P (OMAP343X_SDRC_BASE + SDRC_MANUAL_1)
64 #define SDRC_DLLA_STATUS_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
65 #define SDRC_DLLA_CTRL_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
68 * This file needs be built unconditionally as ARM to interoperate correctly
69 * with non-Thumb-2-capable firmware.
79 * L2 cache needs to be toggled for stable OFF mode functionality on 3630.
80 * This function sets up a flag that will allow for this toggling to take
81 * place on 3630. Hopefully some version in the future may not need this.
83 ENTRY(enable_omap3630_toggle_l2_on_restore)
84 stmfd sp!, {lr} @ save registers on stack
85 /* Setup so that we will disable and enable l2 */
87 adrl r2, l2dis_3630 @ may be too distant for plain adr
89 ldmfd sp!, {pc} @ restore regs and return
90 ENDPROC(enable_omap3630_toggle_l2_on_restore)
93 /* Function to call rom code to save secure ram context */
95 ENTRY(save_secure_ram_context)
96 stmfd sp!, {r4 - r11, lr} @ save registers on stack
97 adr r3, api_params @ r3 points to parameters
98 str r0, [r3,#0x4] @ r0 has sdram address
101 ldr r12, sram_phy_addr_mask
103 mov r0, #25 @ set service ID for PPA
104 mov r12, r0 @ copy secure service ID in r12
105 mov r1, #0 @ set task id for ROM code in r1
106 mov r2, #4 @ set some flags in r2, r6
108 dsb @ data write barrier
109 dmb @ data memory barrier
110 smc #1 @ call SMI monitor (smi #1)
115 ldmfd sp!, {r4 - r11, pc}
122 .word 0x4, 0x0, 0x0, 0x1, 0x1
123 ENDPROC(save_secure_ram_context)
124 ENTRY(save_secure_ram_context_sz)
125 .word . - save_secure_ram_context
128 * ======================
129 * == Idle entry point ==
130 * ======================
134 * Forces OMAP into idle state
136 * omap34xx_cpu_suspend() - This bit of code saves the CPU context if needed
137 * and executes the WFI instruction. Calling WFI effectively changes the
138 * power domains states to the desired target power states.
142 * - this code gets copied to internal SRAM at boot and after wake-up
143 * from OFF mode. The execution pointer in SRAM is _omap_sram_idle.
144 * - when the OMAP wakes up it continues at different execution points
145 * depending on the low power mode (non-OFF vs OFF modes),
146 * cf. 'Resume path for xxx mode' comments.
149 ENTRY(omap34xx_cpu_suspend)
150 stmfd sp!, {r4 - r11, lr} @ save registers on stack
153 * r0 contains CPU context save/restore pointer in sdram
154 * r1 contains information about saving context:
155 * 0 - No context lost
156 * 1 - Only L1 and logic lost
157 * 2 - Only L2 lost (Even L1 is retained we clean it along with L2)
158 * 3 - Both L1 and L2 lost and logic lost
161 /* Directly jump to WFI is the context save is not required */
165 /* Otherwise fall through to the save context code */
167 mov r8, r0 @ Store SDRAM address in r8
168 mrc p15, 0, r5, c1, c0, 1 @ Read Auxiliary Control Register
169 mov r4, #0x1 @ Number of parameters for restore call
170 stmia r8!, {r4-r5} @ Push parameters for restore call
171 mrc p15, 1, r5, c9, c0, 2 @ Read L2 AUX ctrl register
172 stmia r8!, {r4-r5} @ Push parameters for restore call
175 * jump out to kernel flush routine
176 * - reuse that code is better
177 * - it executes in a cached space so is faster than refetch per-block
178 * - should be faster and will change with kernel
179 * - 'might' have to copy address, load and jump to it
180 * Flush all data from the L1 data cache before disabling
188 * Clear the SCTLR.C bit to prevent further data cache
189 * allocation. Clearing SCTLR.C would make all the data accesses
190 * strongly ordered and would not hit the cache.
192 mrc p15, 0, r0, c1, c0, 0
193 bic r0, r0, #(1 << 2) @ Disable the C bit
194 mcr p15, 0, r0, c1, c0, 0
198 * Invalidate L1 data cache. Even though only invalidate is
199 * necessary exported flush API is used here. Doing clean
200 * on already clean cache would be almost NOP.
205 * The kernel doesn't interwork: v7_flush_dcache_all in particluar will
206 * always return in Thumb state when CONFIG_THUMB2_KERNEL is enabled.
207 * This sequence switches back to ARM. Note that .align may insert a
208 * nop: bx pc needs to be word-aligned in order to work.
217 ldr r4, sdrc_power @ read the SDRC_POWER register
218 ldr r5, [r4] @ read the contents of SDRC_POWER
219 orr r5, r5, #0x40 @ enable self refresh on idle req
220 str r5, [r4] @ write back to SDRC_POWER register
222 /* Data memory barrier and Data sync barrier */
227 * ===================================
228 * == WFI instruction => Enter idle ==
229 * ===================================
231 wfi @ wait for interrupt
234 * ===================================
235 * == Resume path for non-OFF modes ==
236 * ===================================
250 mrc p15, 0, r0, c1, c0, 0
251 tst r0, #(1 << 2) @ Check C bit enabled?
252 orreq r0, r0, #(1 << 2) @ Enable the C bit if cleared
253 mcreq p15, 0, r0, c1, c0, 0
257 * ===================================
258 * == Exit point from non-OFF modes ==
259 * ===================================
261 ldmfd sp!, {r4 - r11, pc} @ restore regs and return
265 * ==============================
266 * == Resume path for OFF mode ==
267 * ==============================
271 * The restore_* functions are called by the ROM code
272 * when back from WFI in OFF mode.
273 * Cf. the get_*restore_pointer functions.
275 * restore_es3: applies to 34xx >= ES3.0
276 * restore_3630: applies to 36xx
277 * restore: common code for 3xxx
279 ENTRY(omap3_restore_es3)
280 ldr r5, pm_prepwstst_core_p
283 cmp r4, #0x0 @ Check if previous power state of CORE is OFF
287 ldr r2, es3_sdrc_fix_sz
290 ldmia r0!, {r3} @ val = *src
291 stmia r1!, {r3} @ *dst = val
292 subs r2, r2, #0x1 @ num_words--
297 ENDPROC(omap3_restore_es3)
299 ENTRY(omap3_restore_3630)
300 ldr r1, pm_prepwstst_core_p
303 cmp r2, #0x0 @ Check if previous power state of CORE is OFF
305 /* Disable RTA before giving control */
306 ldr r1, control_mem_rta
307 mov r2, #OMAP36XX_RTA_DISABLE
309 ENDPROC(omap3_restore_3630)
311 /* Fall through to common code for the remaining logic */
315 * Read the pwstctrl register to check the reason for mpu reset.
316 * This tells us what was lost.
318 ldr r1, pm_pwstctrl_mpu
321 cmp r2, #0x0 @ Check if target power state was OFF or RET
325 cmp r0, #0x1 @ should we disable L2 on 3630?
327 mrc p15, 0, r0, c1, c0, 1
328 bic r0, r0, #2 @ disable L2 cache
329 mcr p15, 0, r0, c1, c0, 1
336 mov r0, #40 @ set service ID for PPA
337 mov r12, r0 @ copy secure Service ID in r12
338 mov r1, #0 @ set task id for ROM code in r1
339 mov r2, #4 @ set some flags in r2, r6
341 adr r3, l2_inv_api_params @ r3 points to dummy parameters
342 dsb @ data write barrier
343 dmb @ data memory barrier
344 smc #1 @ call SMI monitor (smi #1)
345 /* Write to Aux control register to set some bits */
346 mov r0, #42 @ set service ID for PPA
347 mov r12, r0 @ copy secure Service ID in r12
348 mov r1, #0 @ set task id for ROM code in r1
349 mov r2, #4 @ set some flags in r2, r6
351 ldr r4, scratchpad_base
352 ldr r3, [r4, #0xBC] @ r3 points to parameters
353 dsb @ data write barrier
354 dmb @ data memory barrier
355 smc #1 @ call SMI monitor (smi #1)
357 #ifdef CONFIG_OMAP3_L2_AUX_SECURE_SAVE_RESTORE
358 /* Restore L2 aux control register */
359 @ set service ID for PPA
360 mov r0, #CONFIG_OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
361 mov r12, r0 @ copy service ID in r12
362 mov r1, #0 @ set task ID for ROM code in r1
363 mov r2, #4 @ set some flags in r2, r6
365 ldr r4, scratchpad_base
367 adds r3, r3, #8 @ r3 points to parameters
368 dsb @ data write barrier
369 dmb @ data memory barrier
370 smc #1 @ call SMI monitor (smi #1)
378 /* Execute smi to invalidate L2 cache */
379 mov r12, #0x1 @ set up to invalidate L2
380 smc #0 @ Call SMI monitor (smieq)
381 /* Write to Aux control register to set some bits */
382 ldr r4, scratchpad_base
386 smc #0 @ Call SMI monitor (smieq)
387 ldr r4, scratchpad_base
391 smc #0 @ Call SMI monitor (smieq)
394 cmp r1, #0x1 @ Test if L2 re-enable needed on 3630
396 mrc p15, 0, r1, c1, c0, 1
397 orr r1, r1, #2 @ re-enable L2 cache
398 mcr p15, 0, r1, c1, c0, 1
401 /* Now branch to the common CPU resume function */
403 ENDPROC(omap3_restore)
411 /* This function implements the erratum ID i443 WA, applies to 34xx >= ES3.0 */
415 ldr r4, sdrc_syscfg @ get config addr
416 ldr r5, [r4] @ get value
417 tst r5, #0x100 @ is part access blocked
419 biceq r5, r5, #0x100 @ clear bit if set
420 str r5, [r4] @ write back change
421 ldr r4, sdrc_mr_0 @ get config addr
422 ldr r5, [r4] @ get value
423 str r5, [r4] @ write back change
424 ldr r4, sdrc_emr2_0 @ get config addr
425 ldr r5, [r4] @ get value
426 str r5, [r4] @ write back change
427 ldr r4, sdrc_manual_0 @ get config addr
428 mov r5, #0x2 @ autorefresh command
429 str r5, [r4] @ kick off refreshes
430 ldr r4, sdrc_mr_1 @ get config addr
431 ldr r5, [r4] @ get value
432 str r5, [r4] @ write back change
433 ldr r4, sdrc_emr2_1 @ get config addr
434 ldr r5, [r4] @ get value
435 str r5, [r4] @ write back change
436 ldr r4, sdrc_manual_1 @ get config addr
437 mov r5, #0x2 @ autorefresh command
438 str r5, [r4] @ kick off refreshes
443 .word SDRC_SYSCONFIG_P
449 .word SDRC_MANUAL_0_P
455 .word SDRC_MANUAL_1_P
456 ENDPROC(es3_sdrc_fix)
457 ENTRY(es3_sdrc_fix_sz)
458 .word . - es3_sdrc_fix
461 * This function implements the erratum ID i581 WA:
462 * SDRC state restore before accessing the SDRAM
464 * Only used at return from non-OFF mode. For OFF
465 * mode the ROM code configures the SDRC and
466 * the DPLL before calling the restore code directly
470 /* Make sure SDRC accesses are ok */
473 /* DPLL3 must be locked before accessing the SDRC. Maybe the HW ensures this */
474 ldr r4, cm_idlest_ckgen
480 ldr r4, cm_idlest1_core
485 /* allow DLL powerdown upon hw idle req */
492 * PC-relative stores lead to undefined behaviour in Thumb-2: use a r7 as a
494 * Be careful not to clobber r7 when maintaing this code.
498 /* Is dll in lock mode? */
499 ldr r4, sdrc_dlla_ctrl
502 bxne lr @ Return if locked
503 /* wait till dll locks */
506 ldr r4, wait_dll_lock_counter
508 str r4, [r7, #wait_dll_lock_counter - kick_counter]
509 ldr r4, sdrc_dlla_status
510 /* Wait 20uS for lock */
519 bx lr @ Return when locked
521 /* disable/reenable DLL if not locked */
523 ldr r4, sdrc_dlla_ctrl
526 bic r6, #(1<<3) @ disable dll
529 orr r6, r6, #(1<<3) @ enable dll
534 str r4, [r7] @ kick_counter
535 b wait_dll_lock_timed
539 .word CM_IDLEST1_CORE_V
541 .word CM_IDLEST_CKGEN_V
543 .word SDRC_DLLA_STATUS_V
545 .word SDRC_DLLA_CTRL_V
547 .word PM_PREPWSTST_CORE_P
549 .word PM_PWSTCTRL_MPU_P
551 .word SCRATCHPAD_BASE_P
553 .word SRAM_BASE_P + 0x8000
559 .word CONTROL_MEM_RTA_CTRL
561 .word v7_flush_dcache_all
565 * When exporting to userspace while the counters are in SRAM,
566 * these 2 words need to be at the end to facilitate retrival!
570 wait_dll_lock_counter:
572 ENDPROC(omap34xx_cpu_suspend)
574 ENTRY(omap34xx_cpu_suspend_sz)
575 .word . - omap34xx_cpu_suspend