/* SPDX-License-Identifier: GPL-2.0-only */ /* * Enter and leave deep sleep state on MPC83xx * * Copyright (c) 2006-2008 Freescale Semiconductor, Inc. * Author: Scott Wood */ #include #include #include #include #define SS_MEMSAVE 0x00 /* First 8 bytes of RAM */ #define SS_HID 0x08 /* 3 HIDs */ #define SS_IABR 0x14 /* 2 IABRs */ #define SS_IBCR 0x1c #define SS_DABR 0x20 /* 2 DABRs */ #define SS_DBCR 0x28 #define SS_SP 0x2c #define SS_SR 0x30 /* 16 segment registers */ #define SS_R2 0x70 #define SS_MSR 0x74 #define SS_SDR1 0x78 #define SS_LR 0x7c #define SS_SPRG 0x80 /* 8 SPRGs */ #define SS_DBAT 0xa0 /* 8 DBATs */ #define SS_IBAT 0xe0 /* 8 IBATs */ #define SS_TB 0x120 #define SS_CR 0x128 #define SS_GPREG 0x12c /* r12-r31 */ #define STATE_SAVE_SIZE 0x17c .section .data .align 5 mpc83xx_sleep_save_area: .space STATE_SAVE_SIZE immrbase: .long 0 .section .text .align 5 /* r3 = physical address of IMMR */ _GLOBAL(mpc83xx_enter_deep_sleep) lis r4, immrbase@ha stw r3, immrbase@l(r4) /* The first 2 words of memory are used to communicate with the * bootloader, to tell it how to resume. * * The first word is the magic number 0xf5153ae5, and the second * is the pointer to mpc83xx_deep_resume. * * The original content of these two words is saved in SS_MEMSAVE. */ lis r3, mpc83xx_sleep_save_area@h ori r3, r3, mpc83xx_sleep_save_area@l lis r4, KERNELBASE@h lwz r5, 0(r4) lwz r6, 4(r4) stw r5, SS_MEMSAVE+0(r3) stw r6, SS_MEMSAVE+4(r3) mfspr r5, SPRN_HID0 mfspr r6, SPRN_HID1 /* FIXME: Should this use SPRN_HID2_G2_LE? */ mfspr r7, SPRN_HID2_750FX stw r5, SS_HID+0(r3) stw r6, SS_HID+4(r3) stw r7, SS_HID+8(r3) mfspr r4, SPRN_IABR mfspr r5, SPRN_IABR2 mfspr r6, SPRN_IBCR mfspr r7, SPRN_DABR mfspr r8, SPRN_DABR2 mfspr r9, SPRN_DBCR stw r4, SS_IABR+0(r3) stw r5, SS_IABR+4(r3) stw r6, SS_IBCR(r3) stw r7, SS_DABR+0(r3) stw r8, SS_DABR+4(r3) stw r9, SS_DBCR(r3) mfspr r4, SPRN_SPRG0 mfspr r5, SPRN_SPRG1 mfspr r6, SPRN_SPRG2 mfspr r7, SPRN_SPRG3 mfsdr1 r8 stw r4, SS_SPRG+0(r3) stw r5, SS_SPRG+4(r3) stw r6, SS_SPRG+8(r3) stw r7, SS_SPRG+12(r3) stw r8, SS_SDR1(r3) mfspr r4, SPRN_SPRG4 mfspr r5, SPRN_SPRG5 mfspr r6, SPRN_SPRG6 mfspr r7, SPRN_SPRG7 stw r4, SS_SPRG+16(r3) stw r5, SS_SPRG+20(r3) stw r6, SS_SPRG+24(r3) stw r7, SS_SPRG+28(r3) mfspr r4, SPRN_DBAT0U mfspr r5, SPRN_DBAT0L mfspr r6, SPRN_DBAT1U mfspr r7, SPRN_DBAT1L stw r4, SS_DBAT+0x00(r3) stw r5, SS_DBAT+0x04(r3) stw r6, SS_DBAT+0x08(r3) stw r7, SS_DBAT+0x0c(r3) mfspr r4, SPRN_DBAT2U mfspr r5, SPRN_DBAT2L mfspr r6, SPRN_DBAT3U mfspr r7, SPRN_DBAT3L stw r4, SS_DBAT+0x10(r3) stw r5, SS_DBAT+0x14(r3) stw r6, SS_DBAT+0x18(r3) stw r7, SS_DBAT+0x1c(r3) mfspr r4, SPRN_DBAT4U mfspr r5, SPRN_DBAT4L mfspr r6, SPRN_DBAT5U mfspr r7, SPRN_DBAT5L stw r4, SS_DBAT+0x20(r3) stw r5, SS_DBAT+0x24(r3) stw r6, SS_DBAT+0x28(r3) stw r7, SS_DBAT+0x2c(r3) mfspr r4, SPRN_DBAT6U mfspr r5, SPRN_DBAT6L mfspr r6, SPRN_DBAT7U mfspr r7, SPRN_DBAT7L stw r4, SS_DBAT+0x30(r3) stw r5, SS_DBAT+0x34(r3) stw r6, SS_DBAT+0x38(r3) stw r7, SS_DBAT+0x3c(r3) mfspr r4, SPRN_IBAT0U mfspr r5, SPRN_IBAT0L mfspr r6, SPRN_IBAT1U mfspr r7, SPRN_IBAT1L stw r4, SS_IBAT+0x00(r3) stw r5, SS_IBAT+0x04(r3) stw r6, SS_IBAT+0x08(r3) stw r7, SS_IBAT+0x0c(r3) mfspr r4, SPRN_IBAT2U mfspr r5, SPRN_IBAT2L mfspr r6, SPRN_IBAT3U mfspr r7, SPRN_IBAT3L stw r4, SS_IBAT+0x10(r3) stw r5, SS_IBAT+0x14(r3) stw r6, SS_IBAT+0x18(r3) stw r7, SS_IBAT+0x1c(r3) mfspr r4, SPRN_IBAT4U mfspr r5, SPRN_IBAT4L mfspr r6, SPRN_IBAT5U mfspr r7, SPRN_IBAT5L stw r4, SS_IBAT+0x20(r3) stw r5, SS_IBAT+0x24(r3) stw r6, SS_IBAT+0x28(r3) stw r7, SS_IBAT+0x2c(r3) mfspr r4, SPRN_IBAT6U mfspr r5, SPRN_IBAT6L mfspr r6, SPRN_IBAT7U mfspr r7, SPRN_IBAT7L stw r4, SS_IBAT+0x30(r3) stw r5, SS_IBAT+0x34(r3) stw r6, SS_IBAT+0x38(r3) stw r7, SS_IBAT+0x3c(r3) mfmsr r4 mflr r5 mfcr r6 stw r4, SS_MSR(r3) stw r5, SS_LR(r3) stw r6, SS_CR(r3) stw r1, SS_SP(r3) stw r2, SS_R2(r3) 1: mftbu r4 mftb r5 mftbu r6 cmpw r4, r6 bne 1b stw r4, SS_TB+0(r3) stw r5, SS_TB+4(r3) stmw r12, SS_GPREG(r3) li r4, 0 addi r6, r3, SS_SR-4 1: mfsrin r5, r4 stwu r5, 4(r6) addis r4, r4, 0x1000 cmpwi r4, 0 bne 1b /* Disable machine checks and critical exceptions */ mfmsr r4 rlwinm r4, r4, 0, ~MSR_CE rlwinm r4, r4, 0, ~MSR_ME mtmsr r4 isync #define TMP_VIRT_IMMR 0xf0000000 #define DEFAULT_IMMR_VALUE 0xff400000 #define IMMRBAR_BASE 0x0000 lis r4, immrbase@ha lwz r4, immrbase@l(r4) /* Use DBAT0 to address the current IMMR space */ ori r4, r4, 0x002a mtspr SPRN_DBAT0L, r4 lis r8, TMP_VIRT_IMMR@h ori r4, r8, 0x001e /* 1 MByte accessible from Kernel Space only */ mtspr SPRN_DBAT0U, r4 isync /* Use DBAT1 to address the original IMMR space */ lis r4, DEFAULT_IMMR_VALUE@h ori r4, r4, 0x002a mtspr SPRN_DBAT1L, r4 lis r9, (TMP_VIRT_IMMR + 0x01000000)@h ori r4, r9, 0x001e /* 1 MByte accessible from Kernel Space only */ mtspr SPRN_DBAT1U, r4 isync /* Use DBAT2 to address the beginning of RAM. This isn't done * using the normal virtual mapping, because with page debugging * enabled it will be read-only. */ li r4, 0x0002 mtspr SPRN_DBAT2L, r4 lis r4, KERNELBASE@h ori r4, r4, 0x001e /* 1 MByte accessible from Kernel Space only */ mtspr SPRN_DBAT2U, r4 isync /* Flush the cache with our BAT, as there will be TLB misses * otherwise if page debugging is enabled, and these misses * will disturb the PLRU algorithm. */ bl __flush_disable_L1 /* Keep the i-cache enabled, so the hack below for low-boot * flash will work. */ mfspr r3, SPRN_HID0 ori r3, r3, HID0_ICE mtspr SPRN_HID0, r3 isync lis r6, 0xf515 ori r6, r6, 0x3ae5 lis r7, mpc83xx_deep_resume@h ori r7, r7, mpc83xx_deep_resume@l tophys(r7, r7) lis r5, KERNELBASE@h stw r6, 0(r5) stw r7, 4(r5) /* Reset BARs */ li r4, 0 stw r4, 0x0024(r8) stw r4, 0x002c(r8) stw r4, 0x0034(r8) stw r4, 0x003c(r8) stw r4, 0x0064(r8) stw r4, 0x006c(r8) /* Rev 1 of the 8313 has problems with wakeup events that are * pending during the transition to deep sleep state (such as if * the PCI host sets the state to D3 and then D0 in rapid * succession). This check shrinks the race window somewhat. * * See erratum PCI23, though the problem is not limited * to PCI. */ lwz r3, 0x0b04(r8) andi. r3, r3, 1 bne- mpc83xx_deep_resume /* Move IMMR back to the default location, following the * procedure specified in the MPC8313 manual. */ lwz r4, IMMRBAR_BASE(r8) isync lis r4, DEFAULT_IMMR_VALUE@h stw r4, IMMRBAR_BASE(r8) lis r4, KERNELBASE@h lwz r4, 0(r4) isync lwz r4, IMMRBAR_BASE(r9) mr r8, r9 isync /* Check the Reset Configuration Word to see whether flash needs * to be mapped at a low address or a high address. */ lwz r4, 0x0904(r8) andis. r4, r4, 0x0400 li r4, 0 beq boot_low lis r4, 0xff80 boot_low: stw r4, 0x0020(r8) lis r7, 0x8000 ori r7, r7, 0x0016 mfspr r5, SPRN_HID0 rlwinm r5, r5, 0, ~(HID0_DOZE | HID0_NAP) oris r5, r5, HID0_SLEEP@h mtspr SPRN_HID0, r5 isync mfmsr r5 oris r5, r5, MSR_POW@h /* Enable the flash mapping at the appropriate address. This * mapping will override the RAM mapping if booting low, so there's * no need to disable the latter. This must be done inside the same * cache line as setting MSR_POW, so that no instruction fetches * from RAM happen after the flash mapping is turned on. */ .align 5 stw r7, 0x0024(r8) sync isync mtmsr r5 isync 1: b 1b mpc83xx_deep_resume: lis r4, 1f@h ori r4, r4, 1f@l tophys(r4, r4) mtsrr0 r4 mfmsr r4 rlwinm r4, r4, 0, ~(MSR_IR | MSR_DR) mtsrr1 r4 rfi 1: tlbia bl __inval_enable_L1 lis r3, mpc83xx_sleep_save_area@h ori r3, r3, mpc83xx_sleep_save_area@l tophys(r3, r3) lwz r5, SS_MEMSAVE+0(r3) lwz r6, SS_MEMSAVE+4(r3) stw r5, 0(0) stw r6, 4(0) lwz r5, SS_HID+0(r3) lwz r6, SS_HID+4(r3) lwz r7, SS_HID+8(r3) mtspr SPRN_HID0, r5 mtspr SPRN_HID1, r6 /* FIXME: Should this use SPRN_HID2_G2_LE? */ mtspr SPRN_HID2_750FX, r7 lwz r4, SS_IABR+0(r3) lwz r5, SS_IABR+4(r3) lwz r6, SS_IBCR(r3) lwz r7, SS_DABR+0(r3) lwz r8, SS_DABR+4(r3) lwz r9, SS_DBCR(r3) mtspr SPRN_IABR, r4 mtspr SPRN_IABR2, r5 mtspr SPRN_IBCR, r6 mtspr SPRN_DABR, r7 mtspr SPRN_DABR2, r8 mtspr SPRN_DBCR, r9 li r4, 0 addi r6, r3, SS_SR-4 1: lwzu r5, 4(r6) mtsrin r5, r4 addis r4, r4, 0x1000 cmpwi r4, 0 bne 1b lwz r4, SS_DBAT+0x00(r3) lwz r5, SS_DBAT+0x04(r3) lwz r6, SS_DBAT+0x08(r3) lwz r7, SS_DBAT+0x0c(r3) mtspr SPRN_DBAT0U, r4 mtspr SPRN_DBAT0L, r5 mtspr SPRN_DBAT1U, r6 mtspr SPRN_DBAT1L, r7 lwz r4, SS_DBAT+0x10(r3) lwz r5, SS_DBAT+0x14(r3) lwz r6, SS_DBAT+0x18(r3) lwz r7, SS_DBAT+0x1c(r3) mtspr SPRN_DBAT2U, r4 mtspr SPRN_DBAT2L, r5 mtspr SPRN_DBAT3U, r6 mtspr SPRN_DBAT3L, r7 lwz r4, SS_DBAT+0x20(r3) lwz r5, SS_DBAT+0x24(r3) lwz r6, SS_DBAT+0x28(r3) lwz r7, SS_DBAT+0x2c(r3) mtspr SPRN_DBAT4U, r4 mtspr SPRN_DBAT4L, r5 mtspr SPRN_DBAT5U, r6 mtspr SPRN_DBAT5L, r7 lwz r4, SS_DBAT+0x30(r3) lwz r5, SS_DBAT+0x34(r3) lwz r6, SS_DBAT+0x38(r3) lwz r7, SS_DBAT+0x3c(r3) mtspr SPRN_DBAT6U, r4 mtspr SPRN_DBAT6L, r5 mtspr SPRN_DBAT7U, r6 mtspr SPRN_DBAT7L, r7 lwz r4, SS_IBAT+0x00(r3) lwz r5, SS_IBAT+0x04(r3) lwz r6, SS_IBAT+0x08(r3) lwz r7, SS_IBAT+0x0c(r3) mtspr SPRN_IBAT0U, r4 mtspr SPRN_IBAT0L, r5 mtspr SPRN_IBAT1U, r6 mtspr SPRN_IBAT1L, r7 lwz r4, SS_IBAT+0x10(r3) lwz r5, SS_IBAT+0x14(r3) lwz r6, SS_IBAT+0x18(r3) lwz r7, SS_IBAT+0x1c(r3) mtspr SPRN_IBAT2U, r4 mtspr SPRN_IBAT2L, r5 mtspr SPRN_IBAT3U, r6 mtspr SPRN_IBAT3L, r7 lwz r4, SS_IBAT+0x20(r3) lwz r5, SS_IBAT+0x24(r3) lwz r6, SS_IBAT+0x28(r3) lwz r7, SS_IBAT+0x2c(r3) mtspr SPRN_IBAT4U, r4 mtspr SPRN_IBAT4L, r5 mtspr SPRN_IBAT5U, r6 mtspr SPRN_IBAT5L, r7 lwz r4, SS_IBAT+0x30(r3) lwz r5, SS_IBAT+0x34(r3) lwz r6, SS_IBAT+0x38(r3) lwz r7, SS_IBAT+0x3c(r3) mtspr SPRN_IBAT6U, r4 mtspr SPRN_IBAT6L, r5 mtspr SPRN_IBAT7U, r6 mtspr SPRN_IBAT7L, r7 lwz r4, SS_SPRG+16(r3) lwz r5, SS_SPRG+20(r3) lwz r6, SS_SPRG+24(r3) lwz r7, SS_SPRG+28(r3) mtspr SPRN_SPRG4, r4 mtspr SPRN_SPRG5, r5 mtspr SPRN_SPRG6, r6 mtspr SPRN_SPRG7, r7 lwz r4, SS_SPRG+0(r3) lwz r5, SS_SPRG+4(r3) lwz r6, SS_SPRG+8(r3) lwz r7, SS_SPRG+12(r3) lwz r8, SS_SDR1(r3) mtspr SPRN_SPRG0, r4 mtspr SPRN_SPRG1, r5 mtspr SPRN_SPRG2, r6 mtspr SPRN_SPRG3, r7 mtsdr1 r8 lwz r4, SS_MSR(r3) lwz r5, SS_LR(r3) lwz r6, SS_CR(r3) lwz r1, SS_SP(r3) lwz r2, SS_R2(r3) mtsrr1 r4 mtsrr0 r5 mtcr r6 li r4, 0 mtspr SPRN_TBWL, r4 lwz r4, SS_TB+0(r3) lwz r5, SS_TB+4(r3) mtspr SPRN_TBWU, r4 mtspr SPRN_TBWL, r5 lmw r12, SS_GPREG(r3) /* Kick decrementer */ li r0, 1 mtdec r0 rfi _ASM_NOKPROBE_SYMBOL(mpc83xx_deep_resume)