forked from Minki/linux
d49747bdfb
Basic PM support for 83xx. Standby is implemented as sleep. Suspend-to-RAM is implemented as "deep sleep" (with the processor turned off) on 831x. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
534 lines
10 KiB
ArmAsm
534 lines
10 KiB
ArmAsm
/*
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* Enter and leave deep sleep state on MPC83xx
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*
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* Copyright (c) 2006-2008 Freescale Semiconductor, Inc.
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* Author: Scott Wood <scottwood@freescale.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <asm/page.h>
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#include <asm/ppc_asm.h>
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#include <asm/reg.h>
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#include <asm/asm-offsets.h>
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#define SS_MEMSAVE 0x00 /* First 8 bytes of RAM */
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#define SS_HID 0x08 /* 3 HIDs */
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#define SS_IABR 0x14 /* 2 IABRs */
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#define SS_IBCR 0x1c
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#define SS_DABR 0x20 /* 2 DABRs */
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#define SS_DBCR 0x28
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#define SS_SP 0x2c
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#define SS_SR 0x30 /* 16 segment registers */
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#define SS_R2 0x70
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#define SS_MSR 0x74
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#define SS_SDR1 0x78
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#define SS_LR 0x7c
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#define SS_SPRG 0x80 /* 4 SPRGs */
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#define SS_DBAT 0x90 /* 8 DBATs */
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#define SS_IBAT 0xd0 /* 8 IBATs */
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#define SS_TB 0x110
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#define SS_CR 0x118
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#define SS_GPREG 0x11c /* r12-r31 */
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#define STATE_SAVE_SIZE 0x16c
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.section .data
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.align 5
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mpc83xx_sleep_save_area:
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.space STATE_SAVE_SIZE
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immrbase:
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.long 0
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.section .text
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.align 5
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/* r3 = physical address of IMMR */
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_GLOBAL(mpc83xx_enter_deep_sleep)
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lis r4, immrbase@ha
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stw r3, immrbase@l(r4)
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/* The first 2 words of memory are used to communicate with the
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* bootloader, to tell it how to resume.
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*
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* The first word is the magic number 0xf5153ae5, and the second
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* is the pointer to mpc83xx_deep_resume.
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*
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* The original content of these two words is saved in SS_MEMSAVE.
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*/
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lis r3, mpc83xx_sleep_save_area@h
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ori r3, r3, mpc83xx_sleep_save_area@l
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lis r4, KERNELBASE@h
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lwz r5, 0(r4)
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lwz r6, 4(r4)
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stw r5, SS_MEMSAVE+0(r3)
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stw r6, SS_MEMSAVE+4(r3)
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mfspr r5, SPRN_HID0
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mfspr r6, SPRN_HID1
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mfspr r7, SPRN_HID2
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stw r5, SS_HID+0(r3)
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stw r6, SS_HID+4(r3)
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stw r7, SS_HID+8(r3)
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mfspr r4, SPRN_IABR
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mfspr r5, SPRN_IABR2
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mfspr r6, SPRN_IBCR
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mfspr r7, SPRN_DABR
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mfspr r8, SPRN_DABR2
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mfspr r9, SPRN_DBCR
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stw r4, SS_IABR+0(r3)
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stw r5, SS_IABR+4(r3)
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stw r6, SS_IBCR(r3)
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stw r7, SS_DABR+0(r3)
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stw r8, SS_DABR+4(r3)
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stw r9, SS_DBCR(r3)
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mfspr r4, SPRN_SPRG0
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mfspr r5, SPRN_SPRG1
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mfspr r6, SPRN_SPRG2
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mfspr r7, SPRN_SPRG3
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mfsdr1 r8
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stw r4, SS_SPRG+0(r3)
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stw r5, SS_SPRG+4(r3)
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stw r6, SS_SPRG+8(r3)
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stw r7, SS_SPRG+12(r3)
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stw r8, SS_SDR1(r3)
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mfspr r4, SPRN_DBAT0U
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mfspr r5, SPRN_DBAT0L
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mfspr r6, SPRN_DBAT1U
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mfspr r7, SPRN_DBAT1L
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stw r4, SS_DBAT+0x00(r3)
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stw r5, SS_DBAT+0x04(r3)
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stw r6, SS_DBAT+0x08(r3)
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stw r7, SS_DBAT+0x0c(r3)
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mfspr r4, SPRN_DBAT2U
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mfspr r5, SPRN_DBAT2L
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mfspr r6, SPRN_DBAT3U
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mfspr r7, SPRN_DBAT3L
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stw r4, SS_DBAT+0x10(r3)
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stw r5, SS_DBAT+0x14(r3)
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stw r6, SS_DBAT+0x18(r3)
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stw r7, SS_DBAT+0x1c(r3)
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mfspr r4, SPRN_DBAT4U
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mfspr r5, SPRN_DBAT4L
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mfspr r6, SPRN_DBAT5U
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mfspr r7, SPRN_DBAT5L
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stw r4, SS_DBAT+0x20(r3)
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stw r5, SS_DBAT+0x24(r3)
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stw r6, SS_DBAT+0x28(r3)
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stw r7, SS_DBAT+0x2c(r3)
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mfspr r4, SPRN_DBAT6U
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mfspr r5, SPRN_DBAT6L
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mfspr r6, SPRN_DBAT7U
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mfspr r7, SPRN_DBAT7L
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stw r4, SS_DBAT+0x30(r3)
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stw r5, SS_DBAT+0x34(r3)
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stw r6, SS_DBAT+0x38(r3)
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stw r7, SS_DBAT+0x3c(r3)
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mfspr r4, SPRN_IBAT0U
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mfspr r5, SPRN_IBAT0L
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mfspr r6, SPRN_IBAT1U
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mfspr r7, SPRN_IBAT1L
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stw r4, SS_IBAT+0x00(r3)
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stw r5, SS_IBAT+0x04(r3)
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stw r6, SS_IBAT+0x08(r3)
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stw r7, SS_IBAT+0x0c(r3)
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mfspr r4, SPRN_IBAT2U
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mfspr r5, SPRN_IBAT2L
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mfspr r6, SPRN_IBAT3U
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mfspr r7, SPRN_IBAT3L
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stw r4, SS_IBAT+0x10(r3)
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stw r5, SS_IBAT+0x14(r3)
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stw r6, SS_IBAT+0x18(r3)
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stw r7, SS_IBAT+0x1c(r3)
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mfspr r4, SPRN_IBAT4U
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mfspr r5, SPRN_IBAT4L
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mfspr r6, SPRN_IBAT5U
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mfspr r7, SPRN_IBAT5L
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stw r4, SS_IBAT+0x20(r3)
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stw r5, SS_IBAT+0x24(r3)
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stw r6, SS_IBAT+0x28(r3)
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stw r7, SS_IBAT+0x2c(r3)
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mfspr r4, SPRN_IBAT6U
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mfspr r5, SPRN_IBAT6L
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mfspr r6, SPRN_IBAT7U
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mfspr r7, SPRN_IBAT7L
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stw r4, SS_IBAT+0x30(r3)
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stw r5, SS_IBAT+0x34(r3)
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stw r6, SS_IBAT+0x38(r3)
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stw r7, SS_IBAT+0x3c(r3)
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mfmsr r4
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mflr r5
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mfcr r6
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stw r4, SS_MSR(r3)
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stw r5, SS_LR(r3)
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stw r6, SS_CR(r3)
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stw r1, SS_SP(r3)
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stw r2, SS_R2(r3)
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1: mftbu r4
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mftb r5
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mftbu r6
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cmpw r4, r6
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bne 1b
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stw r4, SS_TB+0(r3)
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stw r5, SS_TB+4(r3)
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stmw r12, SS_GPREG(r3)
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li r4, 0
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addi r6, r3, SS_SR-4
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1: mfsrin r5, r4
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stwu r5, 4(r6)
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addis r4, r4, 0x1000
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cmpwi r4, 0
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bne 1b
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/* Disable machine checks and critical exceptions */
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mfmsr r4
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rlwinm r4, r4, 0, ~MSR_CE
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rlwinm r4, r4, 0, ~MSR_ME
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mtmsr r4
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isync
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#define TMP_VIRT_IMMR 0xf0000000
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#define DEFAULT_IMMR_VALUE 0xff400000
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#define IMMRBAR_BASE 0x0000
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lis r4, immrbase@ha
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lwz r4, immrbase@l(r4)
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/* Use DBAT0 to address the current IMMR space */
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ori r4, r4, 0x002a
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mtspr SPRN_DBAT0L, r4
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lis r8, TMP_VIRT_IMMR@h
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ori r4, r8, 0x001e /* 1 MByte accessable from Kernel Space only */
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mtspr SPRN_DBAT0U, r4
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isync
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/* Use DBAT1 to address the original IMMR space */
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lis r4, DEFAULT_IMMR_VALUE@h
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ori r4, r4, 0x002a
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mtspr SPRN_DBAT1L, r4
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lis r9, (TMP_VIRT_IMMR + 0x01000000)@h
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ori r4, r9, 0x001e /* 1 MByte accessable from Kernel Space only */
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mtspr SPRN_DBAT1U, r4
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isync
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/* Use DBAT2 to address the beginning of RAM. This isn't done
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* using the normal virtual mapping, because with page debugging
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* enabled it will be read-only.
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*/
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li r4, 0x0002
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mtspr SPRN_DBAT2L, r4
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lis r4, KERNELBASE@h
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ori r4, r4, 0x001e /* 1 MByte accessable from Kernel Space only */
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mtspr SPRN_DBAT2U, r4
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isync
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/* Flush the cache with our BAT, as there will be TLB misses
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* otherwise if page debugging is enabled, and these misses
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* will disturb the PLRU algorithm.
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*/
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bl __flush_disable_L1
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/* Keep the i-cache enabled, so the hack below for low-boot
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* flash will work.
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*/
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mfspr r3, SPRN_HID0
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ori r3, r3, HID0_ICE
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mtspr SPRN_HID0, r3
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isync
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lis r6, 0xf515
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ori r6, r6, 0x3ae5
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lis r7, mpc83xx_deep_resume@h
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ori r7, r7, mpc83xx_deep_resume@l
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tophys(r7, r7)
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lis r5, KERNELBASE@h
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stw r6, 0(r5)
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stw r7, 4(r5)
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/* Reset BARs */
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li r4, 0
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stw r4, 0x0024(r8)
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stw r4, 0x002c(r8)
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stw r4, 0x0034(r8)
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stw r4, 0x003c(r8)
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stw r4, 0x0064(r8)
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stw r4, 0x006c(r8)
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/* Rev 1 of the 8313 has problems with wakeup events that are
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* pending during the transition to deep sleep state (such as if
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* the PCI host sets the state to D3 and then D0 in rapid
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* succession). This check shrinks the race window somewhat.
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*
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* See erratum PCI23, though the problem is not limited
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* to PCI.
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*/
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lwz r3, 0x0b04(r8)
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andi. r3, r3, 1
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bne- mpc83xx_deep_resume
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/* Move IMMR back to the default location, following the
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* procedure specified in the MPC8313 manual.
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*/
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lwz r4, IMMRBAR_BASE(r8)
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isync
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lis r4, DEFAULT_IMMR_VALUE@h
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stw r4, IMMRBAR_BASE(r8)
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lis r4, KERNELBASE@h
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lwz r4, 0(r4)
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isync
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lwz r4, IMMRBAR_BASE(r9)
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mr r8, r9
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isync
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/* Check the Reset Configuration Word to see whether flash needs
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* to be mapped at a low address or a high address.
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*/
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lwz r4, 0x0904(r8)
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andis. r4, r4, 0x0400
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li r4, 0
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beq boot_low
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lis r4, 0xff80
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boot_low:
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stw r4, 0x0020(r8)
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lis r7, 0x8000
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ori r7, r7, 0x0016
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mfspr r5, SPRN_HID0
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rlwinm r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
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oris r5, r5, HID0_SLEEP@h
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mtspr SPRN_HID0, r5
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isync
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mfmsr r5
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oris r5, r5, MSR_POW@h
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/* Enable the flash mapping at the appropriate address. This
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* mapping will override the RAM mapping if booting low, so there's
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* no need to disable the latter. This must be done inside the same
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* cache line as setting MSR_POW, so that no instruction fetches
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* from RAM happen after the flash mapping is turned on.
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*/
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.align 5
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stw r7, 0x0024(r8)
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sync
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isync
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mtmsr r5
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isync
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1: b 1b
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mpc83xx_deep_resume:
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lis r4, 1f@h
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ori r4, r4, 1f@l
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tophys(r4, r4)
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mtsrr0 r4
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mfmsr r4
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rlwinm r4, r4, 0, ~(MSR_IR | MSR_DR)
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mtsrr1 r4
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rfi
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1: tlbia
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bl __inval_enable_L1
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lis r3, mpc83xx_sleep_save_area@h
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ori r3, r3, mpc83xx_sleep_save_area@l
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tophys(r3, r3)
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lwz r5, SS_MEMSAVE+0(r3)
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lwz r6, SS_MEMSAVE+4(r3)
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stw r5, 0(0)
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stw r6, 4(0)
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lwz r5, SS_HID+0(r3)
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lwz r6, SS_HID+4(r3)
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lwz r7, SS_HID+8(r3)
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mtspr SPRN_HID0, r5
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mtspr SPRN_HID1, r6
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mtspr SPRN_HID2, r7
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lwz r4, SS_IABR+0(r3)
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lwz r5, SS_IABR+4(r3)
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lwz r6, SS_IBCR(r3)
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lwz r7, SS_DABR+0(r3)
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lwz r8, SS_DABR+4(r3)
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lwz r9, SS_DBCR(r3)
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mtspr SPRN_IABR, r4
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mtspr SPRN_IABR2, r5
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mtspr SPRN_IBCR, r6
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mtspr SPRN_DABR, r7
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mtspr SPRN_DABR2, r8
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mtspr SPRN_DBCR, r9
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li r4, 0
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addi r6, r3, SS_SR-4
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1: lwzu r5, 4(r6)
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mtsrin r5, r4
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addis r4, r4, 0x1000
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cmpwi r4, 0
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bne 1b
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lwz r4, SS_DBAT+0x00(r3)
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lwz r5, SS_DBAT+0x04(r3)
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lwz r6, SS_DBAT+0x08(r3)
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lwz r7, SS_DBAT+0x0c(r3)
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mtspr SPRN_DBAT0U, r4
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mtspr SPRN_DBAT0L, r5
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mtspr SPRN_DBAT1U, r6
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mtspr SPRN_DBAT1L, r7
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lwz r4, SS_DBAT+0x10(r3)
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lwz r5, SS_DBAT+0x14(r3)
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lwz r6, SS_DBAT+0x18(r3)
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lwz r7, SS_DBAT+0x1c(r3)
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mtspr SPRN_DBAT2U, r4
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mtspr SPRN_DBAT2L, r5
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mtspr SPRN_DBAT3U, r6
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mtspr SPRN_DBAT3L, r7
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lwz r4, SS_DBAT+0x20(r3)
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lwz r5, SS_DBAT+0x24(r3)
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lwz r6, SS_DBAT+0x28(r3)
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lwz r7, SS_DBAT+0x2c(r3)
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mtspr SPRN_DBAT4U, r4
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mtspr SPRN_DBAT4L, r5
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mtspr SPRN_DBAT5U, r6
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mtspr SPRN_DBAT5L, r7
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lwz r4, SS_DBAT+0x30(r3)
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lwz r5, SS_DBAT+0x34(r3)
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lwz r6, SS_DBAT+0x38(r3)
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lwz r7, SS_DBAT+0x3c(r3)
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mtspr SPRN_DBAT6U, r4
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mtspr SPRN_DBAT6L, r5
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mtspr SPRN_DBAT7U, r6
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mtspr SPRN_DBAT7L, r7
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lwz r4, SS_IBAT+0x00(r3)
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lwz r5, SS_IBAT+0x04(r3)
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lwz r6, SS_IBAT+0x08(r3)
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lwz r7, SS_IBAT+0x0c(r3)
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mtspr SPRN_IBAT0U, r4
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mtspr SPRN_IBAT0L, r5
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mtspr SPRN_IBAT1U, r6
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mtspr SPRN_IBAT1L, r7
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lwz r4, SS_IBAT+0x10(r3)
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lwz r5, SS_IBAT+0x14(r3)
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lwz r6, SS_IBAT+0x18(r3)
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lwz r7, SS_IBAT+0x1c(r3)
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mtspr SPRN_IBAT2U, r4
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mtspr SPRN_IBAT2L, r5
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mtspr SPRN_IBAT3U, r6
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mtspr SPRN_IBAT3L, r7
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lwz r4, SS_IBAT+0x20(r3)
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lwz r5, SS_IBAT+0x24(r3)
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lwz r6, SS_IBAT+0x28(r3)
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lwz r7, SS_IBAT+0x2c(r3)
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mtspr SPRN_IBAT4U, r4
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mtspr SPRN_IBAT4L, r5
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mtspr SPRN_IBAT5U, r6
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mtspr SPRN_IBAT5L, r7
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lwz r4, SS_IBAT+0x30(r3)
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lwz r5, SS_IBAT+0x34(r3)
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lwz r6, SS_IBAT+0x38(r3)
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lwz r7, SS_IBAT+0x3c(r3)
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mtspr SPRN_IBAT6U, r4
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mtspr SPRN_IBAT6L, r5
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mtspr SPRN_IBAT7U, r6
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mtspr SPRN_IBAT7L, r7
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lwz r4, SS_SPRG+0(r3)
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lwz r5, SS_SPRG+4(r3)
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lwz r6, SS_SPRG+8(r3)
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lwz r7, SS_SPRG+12(r3)
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lwz r8, SS_SDR1(r3)
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mtspr SPRN_SPRG0, r4
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mtspr SPRN_SPRG1, r5
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mtspr SPRN_SPRG2, r6
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mtspr SPRN_SPRG3, r7
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mtsdr1 r8
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lwz r4, SS_MSR(r3)
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lwz r5, SS_LR(r3)
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lwz r6, SS_CR(r3)
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lwz r1, SS_SP(r3)
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lwz r2, SS_R2(r3)
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mtsrr1 r4
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mtsrr0 r5
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mtcr r6
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li r4, 0
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mtspr SPRN_TBWL, r4
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lwz r4, SS_TB+0(r3)
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lwz r5, SS_TB+4(r3)
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mtspr SPRN_TBWU, r4
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mtspr SPRN_TBWL, r5
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lmw r12, SS_GPREG(r3)
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/* Kick decrementer */
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li r0, 1
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mtdec r0
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rfi
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