1/* 2 * PXA27x standby mode 3 * 4 * Author: David Burrage 5 * 6 * 2005 (c) MontaVista Software, Inc. This file is licensed under 7 * the terms of the GNU General Public License version 2. This program 8 * is licensed "as is" without any warranty of any kind, whether express 9 * or implied. 10 */ 11 12#include <linux/linkage.h> 13#include <asm/assembler.h> 14#include <asm/hardware.h> 15 16#include <asm/arch/pxa-regs.h> 17 18 .text 19 20#ifdef CONFIG_PXA27x 21ENTRY(pxa_cpu_standby) 22 ldr r0, =PSSR 23 mov r1, #(PSSR_PH | PSSR_STS) 24 mov r2, #PWRMODE_STANDBY 25 mov r3, #UNCACHED_PHYS_0 @ Read mem context in. 26 ldr ip, [r3] 27 b 1f 28 29 .align 5 301: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby 31 str r1, [r0] @ make sure PSSR_PH/STS are clear 32 mov pc, lr 33 34#endif 35 36#ifdef CONFIG_PXA3xx 37 38#define MDCNFG 0x0000 39#define MDCNFG_DMCEN (1 << 30) 40#define DDR_HCAL 0x0060 41#define DDR_HCAL_HCRNG 0x1f 42#define DDR_HCAL_HCPROG (1 << 28) 43#define DDR_HCAL_HCEN (1 << 31) 44#define DMCIER 0x0070 45#define DMCIER_EDLP (1 << 29) 46#define DMCISR 0x0078 47#define RCOMP 0x0100 48#define RCOMP_SWEVAL (1 << 31) 49 50ENTRY(pm_enter_standby_start) 51 mov r1, #0xf6000000 @ DMEMC_REG_BASE (MDCNFG) 52 add r1, r1, #0x00100000 53 54 /* 55 * Preload the TLB entry for accessing the dynamic memory 56 * controller registers. Note that page table lookups will 57 * fail until the dynamic memory controller has been 58 * reinitialised - and that includes MMU page table walks. 59 * This also means that only the dynamic memory controller 60 * can be reliably accessed in the code following standby. 61 */ 62 ldr r2, [r1] @ Dummy read MDCNFG 63 64 mcr p14, 0, r0, c7, c0, 0 65 .rept 8 66 nop 67 .endr 68 69 ldr r0, [r1, #DDR_HCAL] @ Clear (and wait for) HCEN 70 bic r0, r0, #DDR_HCAL_HCEN 71 str r0, [r1, #DDR_HCAL] 721: ldr r0, [r1, #DDR_HCAL] 73 tst r0, #DDR_HCAL_HCEN 74 bne 1b 75 76 ldr r0, [r1, #RCOMP] @ Initiate RCOMP 77 orr r0, r0, #RCOMP_SWEVAL 78 str r0, [r1, #RCOMP] 79 80 mov r0, #~0 @ Clear interrupts 81 str r0, [r1, #DMCISR] 82 83 ldr r0, [r1, #DMCIER] @ set DMIER[EDLP] 84 orr r0, r0, #DMCIER_EDLP 85 str r0, [r1, #DMCIER] 86 87 ldr r0, [r1, #DDR_HCAL] @ clear HCRNG, set HCPROG, HCEN 88 bic r0, r0, #DDR_HCAL_HCRNG 89 orr r0, r0, #DDR_HCAL_HCEN | DDR_HCAL_HCPROG 90 str r0, [r1, #DDR_HCAL] 91 921: ldr r0, [r1, #DMCISR] 93 tst r0, #DMCIER_EDLP 94 beq 1b 95 96 ldr r0, [r1, #MDCNFG] @ set MDCNFG[DMCEN] 97 orr r0, r0, #MDCNFG_DMCEN 98 str r0, [r1, #MDCNFG] 991: ldr r0, [r1, #MDCNFG] 100 tst r0, #MDCNFG_DMCEN 101 beq 1b 102 103 ldr r0, [r1, #DDR_HCAL] @ set DDR_HCAL[HCRNG] 104 orr r0, r0, #2 @ HCRNG 105 str r0, [r1, #DDR_HCAL] 106 107 ldr r0, [r1, #DMCIER] @ Clear the interrupt 108 bic r0, r0, #0x20000000 109 str r0, [r1, #DMCIER] 110 111 mov pc, lr 112ENTRY(pm_enter_standby_end) 113 114#endif 115