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26705ca4 TP |
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 | ||
26705ca4 TP |
12 | #include <linux/linkage.h> |
13 | #include <asm/assembler.h> | |
a09e64fb | 14 | #include <mach/hardware.h> |
26705ca4 | 15 | |
a09e64fb RK |
16 | #include <mach/pxa-regs.h> |
17 | #include <mach/pxa2xx-regs.h> | |
26705ca4 TP |
18 | |
19 | .text | |
20 | ||
533462fb | 21 | #ifdef CONFIG_PXA27x |
26705ca4 TP |
22 | ENTRY(pxa_cpu_standby) |
23 | ldr r0, =PSSR | |
24 | mov r1, #(PSSR_PH | PSSR_STS) | |
80a18573 | 25 | mov r2, #PWRMODE_STANDBY |
26705ca4 TP |
26 | mov r3, #UNCACHED_PHYS_0 @ Read mem context in. |
27 | ldr ip, [r3] | |
28 | b 1f | |
29 | ||
30 | .align 5 | |
31 | 1: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby | |
32 | str r1, [r0] @ make sure PSSR_PH/STS are clear | |
33 | mov pc, lr | |
533462fb RK |
34 | |
35 | #endif | |
7b5dea12 RK |
36 | |
37 | #ifdef CONFIG_PXA3xx | |
38 | ||
ffdf7862 RK |
39 | #define PXA3_MDCNFG 0x0000 |
40 | #define PXA3_MDCNFG_DMCEN (1 << 30) | |
41 | #define PXA3_DDR_HCAL 0x0060 | |
42 | #define PXA3_DDR_HCAL_HCRNG 0x1f | |
43 | #define PXA3_DDR_HCAL_HCPROG (1 << 28) | |
44 | #define PXA3_DDR_HCAL_HCEN (1 << 31) | |
45 | #define PXA3_DMCIER 0x0070 | |
46 | #define PXA3_DMCIER_EDLP (1 << 29) | |
47 | #define PXA3_DMCISR 0x0078 | |
48 | #define PXA3_RCOMP 0x0100 | |
49 | #define PXA3_RCOMP_SWEVAL (1 << 31) | |
7b5dea12 RK |
50 | |
51 | ENTRY(pm_enter_standby_start) | |
ffdf7862 | 52 | mov r1, #0xf6000000 @ DMEMC_REG_BASE (PXA3_MDCNFG) |
7b5dea12 RK |
53 | add r1, r1, #0x00100000 |
54 | ||
55 | /* | |
56 | * Preload the TLB entry for accessing the dynamic memory | |
57 | * controller registers. Note that page table lookups will | |
58 | * fail until the dynamic memory controller has been | |
59 | * reinitialised - and that includes MMU page table walks. | |
60 | * This also means that only the dynamic memory controller | |
61 | * can be reliably accessed in the code following standby. | |
62 | */ | |
ffdf7862 | 63 | ldr r2, [r1] @ Dummy read PXA3_MDCNFG |
7b5dea12 RK |
64 | |
65 | mcr p14, 0, r0, c7, c0, 0 | |
66 | .rept 8 | |
67 | nop | |
68 | .endr | |
69 | ||
ffdf7862 RK |
70 | ldr r0, [r1, #PXA3_DDR_HCAL] @ Clear (and wait for) HCEN |
71 | bic r0, r0, #PXA3_DDR_HCAL_HCEN | |
72 | str r0, [r1, #PXA3_DDR_HCAL] | |
73 | 1: ldr r0, [r1, #PXA3_DDR_HCAL] | |
74 | tst r0, #PXA3_DDR_HCAL_HCEN | |
7b5dea12 RK |
75 | bne 1b |
76 | ||
ffdf7862 RK |
77 | ldr r0, [r1, #PXA3_RCOMP] @ Initiate RCOMP |
78 | orr r0, r0, #PXA3_RCOMP_SWEVAL | |
79 | str r0, [r1, #PXA3_RCOMP] | |
7b5dea12 | 80 | |
ffdf7862 RK |
81 | mov r0, #~0 @ Clear interrupts |
82 | str r0, [r1, #PXA3_DMCISR] | |
7b5dea12 | 83 | |
ffdf7862 RK |
84 | ldr r0, [r1, #PXA3_DMCIER] @ set DMIER[EDLP] |
85 | orr r0, r0, #PXA3_DMCIER_EDLP | |
86 | str r0, [r1, #PXA3_DMCIER] | |
7b5dea12 | 87 | |
ffdf7862 RK |
88 | ldr r0, [r1, #PXA3_DDR_HCAL] @ clear HCRNG, set HCPROG, HCEN |
89 | bic r0, r0, #PXA3_DDR_HCAL_HCRNG | |
90 | orr r0, r0, #PXA3_DDR_HCAL_HCEN | PXA3_DDR_HCAL_HCPROG | |
91 | str r0, [r1, #PXA3_DDR_HCAL] | |
7b5dea12 | 92 | |
ffdf7862 RK |
93 | 1: ldr r0, [r1, #PXA3_DMCISR] |
94 | tst r0, #PXA3_DMCIER_EDLP | |
7b5dea12 RK |
95 | beq 1b |
96 | ||
ffdf7862 RK |
97 | ldr r0, [r1, #PXA3_MDCNFG] @ set PXA3_MDCNFG[DMCEN] |
98 | orr r0, r0, #PXA3_MDCNFG_DMCEN | |
99 | str r0, [r1, #PXA3_MDCNFG] | |
100 | 1: ldr r0, [r1, #PXA3_MDCNFG] | |
101 | tst r0, #PXA3_MDCNFG_DMCEN | |
7b5dea12 RK |
102 | beq 1b |
103 | ||
ffdf7862 | 104 | ldr r0, [r1, #PXA3_DDR_HCAL] @ set PXA3_DDR_HCAL[HCRNG] |
7b5dea12 | 105 | orr r0, r0, #2 @ HCRNG |
ffdf7862 | 106 | str r0, [r1, #PXA3_DDR_HCAL] |
7b5dea12 | 107 | |
ffdf7862 | 108 | ldr r0, [r1, #PXA3_DMCIER] @ Clear the interrupt |
7b5dea12 | 109 | bic r0, r0, #0x20000000 |
ffdf7862 | 110 | str r0, [r1, #PXA3_DMCIER] |
7b5dea12 RK |
111 | |
112 | mov pc, lr | |
113 | ENTRY(pm_enter_standby_end) | |
114 | ||
115 | #endif |