/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright 2002 Embedded Edge, LLC * Author: dan@embeddededge.com * * Sleep helper for Au1xxx sleep mode. */ #include <asm/asm.h> #include <asm/mipsregs.h> #include <asm/regdef.h> #include <asm/stackframe.h> .extern __flush_cache_all .text .set noreorder .set noat .align 5 /* preparatory stuff */ .macro SETUP_SLEEP subu sp, PT_SIZE sw $1, PT_R1(sp) sw $2, PT_R2(sp) sw $3, PT_R3(sp) sw $4, PT_R4(sp) sw $5, PT_R5(sp) sw $6, PT_R6(sp) sw $7, PT_R7(sp) sw $16, PT_R16(sp) sw $17, PT_R17(sp) sw $18, PT_R18(sp) sw $19, PT_R19(sp) sw $20, PT_R20(sp) sw $21, PT_R21(sp) sw $22, PT_R22(sp) sw $23, PT_R23(sp) sw $26, PT_R26(sp) sw $27, PT_R27(sp) sw $28, PT_R28(sp) sw $30, PT_R30(sp) sw $31, PT_R31(sp) mfc0 k0, CP0_STATUS sw k0, 0x20(sp) mfc0 k0, CP0_CONTEXT sw k0, 0x1c(sp) mfc0 k0, CP0_PAGEMASK sw k0, 0x18(sp) mfc0 k0, CP0_CONFIG sw k0, 0x14(sp) /* flush caches to make sure context is in memory */ la t1, __flush_cache_all lw t0, 0(t1) jalr t0 nop /* Now set up the scratch registers so the boot rom will * return to this point upon wakeup. * sys_scratch0 : SP * sys_scratch1 : RA */ lui t3, 0xb190 /* sys_xxx */ sw sp, 0x0018(t3) la k0, alchemy_sleep_wakeup /* resume path */ sw k0, 0x001c(t3) .endm .macro DO_SLEEP /* put power supply and processor to sleep */ sw zero, 0x0078(t3) /* sys_slppwr */ sync sw zero, 0x007c(t3) /* sys_sleep */ sync nop nop nop nop nop nop nop nop .endm /* sleep code for Au1000/Au1100/Au1500 memory controller type */ LEAF(alchemy_sleep_au1000) SETUP_SLEEP /* cache following instructions, as memory gets put to sleep */ la t0, 1f .set arch=r4000 cache 0x14, 0(t0) cache 0x14, 32(t0) cache 0x14, 64(t0) cache 0x14, 96(t0) .set mips0 1: lui a0, 0xb400 /* mem_xxx */ sw zero, 0x001c(a0) /* Precharge */ sync sw zero, 0x0020(a0) /* Auto Refresh */ sync sw zero, 0x0030(a0) /* Sleep */ sync DO_SLEEP END(alchemy_sleep_au1000) /* sleep code for Au1550/Au1200 memory controller type */ LEAF(alchemy_sleep_au1550) SETUP_SLEEP /* cache following instructions, as memory gets put to sleep */ la t0, 1f .set arch=r4000 cache 0x14, 0(t0) cache 0x14, 32(t0) cache 0x14, 64(t0) cache 0x14, 96(t0) .set mips0 1: lui a0, 0xb400 /* mem_xxx */ sw zero, 0x08c0(a0) /* Precharge */ sync sw zero, 0x08d0(a0) /* Self Refresh */ sync /* wait for sdram to enter self-refresh mode */ lui t0, 0x0100 2: lw t1, 0x0850(a0) /* mem_sdstat */ and t2, t1, t0 beq t2, zero, 2b nop /* disable SDRAM clocks */ lui t0, 0xcfff ori t0, t0, 0xffff lw t1, 0x0840(a0) /* mem_sdconfiga */ and t1, t0, t1 /* clear CE[1:0] */ sw t1, 0x0840(a0) /* mem_sdconfiga */ sync DO_SLEEP END(alchemy_sleep_au1550) /* sleepcode for Au1300 memory controller type */ LEAF(alchemy_sleep_au1300) SETUP_SLEEP /* cache following instructions, as memory gets put to sleep */ la t0, 2f la t1, 4f subu t2, t1, t0 .set arch=r4000 1: cache 0x14, 0(t0) subu t2, t2, 32 bgez t2, 1b addu t0, t0, 32 .set mips0 2: lui a0, 0xb400 /* mem_xxx */ /* disable all ports in mem_sdportcfga */ sw zero, 0x868(a0) /* mem_sdportcfga */ sync /* disable ODT */ li t0, 0x03010000 sw t0, 0x08d8(a0) /* mem_sdcmd0 */ sw t0, 0x08dc(a0) /* mem_sdcmd1 */ sync /* precharge */ li t0, 0x23000400 sw t0, 0x08dc(a0) /* mem_sdcmd1 */ sw t0, 0x08d8(a0) /* mem_sdcmd0 */ sync /* auto refresh */ sw zero, 0x08c8(a0) /* mem_sdautoref */ sync /* block access to the DDR */ lw t0, 0x0848(a0) /* mem_sdconfigb */ li t1, (1 << 7 | 0x3F) or t0, t0, t1 sw t0, 0x0848(a0) /* mem_sdconfigb */ sync /* issue the Self Refresh command */ li t0, 0x10000000 sw t0, 0x08dc(a0) /* mem_sdcmd1 */ sw t0, 0x08d8(a0) /* mem_sdcmd0 */ sync /* wait for sdram to enter self-refresh mode */ lui t0, 0x0300 3: lw t1, 0x0850(a0) /* mem_sdstat */ and t2, t1, t0 bne t2, t0, 3b nop /* disable SDRAM clocks */ li t0, ~(3<<28) lw t1, 0x0840(a0) /* mem_sdconfiga */ and t1, t1, t0 /* clear CE[1:0] */ sw t1, 0x0840(a0) /* mem_sdconfiga */ sync DO_SLEEP 4: END(alchemy_sleep_au1300) /* This is where we return upon wakeup. * Reload all of the registers and return. */ LEAF(alchemy_sleep_wakeup) lw k0, 0x20(sp) mtc0 k0, CP0_STATUS lw k0, 0x1c(sp) mtc0 k0, CP0_CONTEXT lw k0, 0x18(sp) mtc0 k0, CP0_PAGEMASK lw k0, 0x14(sp) mtc0 k0, CP0_CONFIG /* We need to catch the early Alchemy SOCs with * the write-only Config[OD] bit and set it back to one... */ jal au1x00_fixup_config_od nop lw $1, PT_R1(sp) lw $2, PT_R2(sp) lw $3, PT_R3(sp) lw $4, PT_R4(sp) lw $5, PT_R5(sp) lw $6, PT_R6(sp) lw $7, PT_R7(sp) lw $16, PT_R16(sp) lw $17, PT_R17(sp) lw $18, PT_R18(sp) lw $19, PT_R19(sp) lw $20, PT_R20(sp) lw $21, PT_R21(sp) lw $22, PT_R22(sp) lw $23, PT_R23(sp) lw $26, PT_R26(sp) lw $27, PT_R27(sp) lw $28, PT_R28(sp) lw $30, PT_R30(sp) lw $31, PT_R31(sp) jr ra addiu sp, PT_SIZE END(alchemy_sleep_wakeup)