diff options
Diffstat (limited to 'arch/mips/alchemy/common/sleeper.S')
| -rw-r--r-- | arch/mips/alchemy/common/sleeper.S | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/sleeper.S b/arch/mips/alchemy/common/sleeper.S new file mode 100644 index 0000000000..13586d2243 --- /dev/null +++ b/arch/mips/alchemy/common/sleeper.S @@ -0,0 +1,266 @@ +/* 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) |