diff options
Diffstat (limited to 'arch/unicore32/kernel/sleep.S')
| -rw-r--r-- | arch/unicore32/kernel/sleep.S | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/unicore32/kernel/sleep.S b/arch/unicore32/kernel/sleep.S new file mode 100644 index 00000000..607a104a --- /dev/null +++ b/arch/unicore32/kernel/sleep.S @@ -0,0 +1,202 @@ +/* + * linux/arch/unicore32/kernel/sleep.S + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> + * Copyright (C) 2001-2010 Guan Xuetao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <mach/hardware.h> + + .text + +pkunity_cpu_save_cp: + + @ get coprocessor registers + + movc r3, p0.c7, #0 @ PID + movc r4, p0.c2, #0 @ translation table base addr + movc r5, p0.c1, #0 @ control reg + + + @ store them plus current virtual stack ptr on stack + mov r6, sp + stm.w (r3 - r6), [sp-] + + mov pc, lr + +pkunity_cpu_save_sp: + @ preserve phys address of stack + mov r0, sp + stw.w lr, [sp+], #-4 + b.l sleep_phys_sp + ldw r1, =sleep_save_sp + stw r0, [r1] + ldw.w pc, [sp]+, #4 + +/* + * puv3_cpu_suspend() + * + * Forces CPU into sleep state. + * + * r0 = value for PWRMODE M field for desired sleep state + */ + +ENTRY(puv3_cpu_suspend) + stm.w (r16 - r27, lr), [sp-] @ save registers on stack + stm.w (r4 - r15), [sp-] @ save registers on stack + +#ifdef CONFIG_UNICORE_FPU_F64 + sfm.w (f0 - f7 ), [sp-] + sfm.w (f8 - f15), [sp-] + sfm.w (f16 - f23), [sp-] + sfm.w (f24 - f31), [sp-] + cff r4, s31 + stm.w (r4), [sp-] +#endif + b.l pkunity_cpu_save_cp + + b.l pkunity_cpu_save_sp + + @ clean data cache + mov r1, #0 + movc p0.c5, r1, #14 + nop + nop + nop + nop + + + + @ DDR2 BaseAddr + ldw r0, =(PKUNITY_DDR2CTRL_BASE) + + @ PM BaseAddr + ldw r1, =(PKUNITY_PM_BASE) + + @ set PLL_SYS_CFG reg, 275 + movl r6, #0x00002401 + stw r6, [r1+], #0x18 + @ set PLL_DDR_CFG reg, 66MHz + movl r6, #0x00100c00 + stw r6, [r1+], #0x1c + + @ set wake up source + movl r8, #0x800001ff @ epip4d + stw r8, [r1+], #0xc + + @ set PGSR + movl r5, #0x40000 + stw r5, [r1+], #0x10 + + @ prepare DDR2 refresh settings + ldw r5, [r0+], #0x24 + or r5, r5, #0x00000001 + + @ prepare PMCR for PLL changing + movl r6, #0xc + + @ prepare for closing PLL + movl r7, #0x1 + + @ prepare sleep mode + mov r8, #0x1 + +@ movl r0, 0x11111111 +@ put_word_ocd r0 + b pkunity_cpu_do_suspend + + .ltorg + .align 5 +pkunity_cpu_do_suspend: + b 101f + @ put DDR2 into self-refresh +100: stw r5, [r0+], #0x24 + @ change PLL + stw r6, [r1] + b 1f + + .ltorg + .align 5 +101: b 102f + @ wait for PLL changing complete +1: ldw r6, [r1+], #0x44 + csub.a r6, #0x1 + bne 1b + b 2f + + .ltorg + .align 5 +102: b 100b + @ close PLL +2: stw r7, [r1+], #0x4 + @ enter sleep mode + stw r8, [r1] +3: b 3b + + + + +/* + * puv3_cpu_resume() + * + * entry point from bootloader into kernel during resume + * + * Note: Yes, part of the following code is located into the .data section. + * This is to allow sleep_save_sp to be accessed with a relative load + * while we can't rely on any MMU translation. We could have put + * sleep_save_sp in the .text section as well, but some setups might + * insist on it to be truly read-only. + */ + + .data + .align 5 +ENTRY(puv3_cpu_resume) +@ movl r0, 0x20202020 +@ put_word_ocd r0 + + ldw r0, sleep_save_sp @ stack phys addr + ldw r2, =resume_after_mmu @ its absolute virtual address + ldm (r3 - r6), [r0]+ @ CP regs + virt stack ptr + mov sp, r6 @ CP regs + virt stack ptr + + mov r1, #0 + movc p0.c6, r1, #6 @ invalidate I & D TLBs + movc p0.c5, r1, #28 @ invalidate I & D caches, BTB + + movc p0.c7, r3, #0 @ PID + movc p0.c2, r4, #0 @ translation table base addr + movc p0.c1, r5, #0 @ control reg, turn on mmu + nop + jump r2 + nop + nop + nop + nop + nop + +sleep_save_sp: + .word 0 @ preserve stack phys ptr here + + .text +resume_after_mmu: +@ movl r0, 0x30303030 +@ put_word_ocd r0 + +#ifdef CONFIG_UNICORE_FPU_F64 + lfm.w (f0 - f7 ), [sp]+ + lfm.w (f8 - f15), [sp]+ + lfm.w (f16 - f23), [sp]+ + lfm.w (f24 - f31), [sp]+ + ldm.w (r4), [sp]+ + ctf r4, s31 +#endif + ldm.w (r4 - r15), [sp]+ @ restore registers from stack + ldm.w (r16 - r27, pc), [sp]+ @ return to caller |