4 * Author: David Burrage
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
12 #include <linux/linkage.h>
13 #include <asm/assembler.h>
15 #include "pxa2xx-regs.h"
20 ENTRY(pxa_cpu_standby)
22 mov r1, #(PSSR_PH | PSSR_STS)
23 mov r2, #PWRMODE_STANDBY
24 mov r3, #UNCACHED_PHYS_0 @ Read mem context in.
29 1: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby
30 str r1, [r0] @ make sure PSSR_PH/STS are clear
37 #define PXA3_MDCNFG 0x0000
38 #define PXA3_MDCNFG_DMCEN (1 << 30)
39 #define PXA3_DDR_HCAL 0x0060
40 #define PXA3_DDR_HCAL_HCRNG 0x1f
41 #define PXA3_DDR_HCAL_HCPROG (1 << 28)
42 #define PXA3_DDR_HCAL_HCEN (1 << 31)
43 #define PXA3_DMCIER 0x0070
44 #define PXA3_DMCIER_EDLP (1 << 29)
45 #define PXA3_DMCISR 0x0078
46 #define PXA3_RCOMP 0x0100
47 #define PXA3_RCOMP_SWEVAL (1 << 31)
49 ENTRY(pm_enter_standby_start)
50 mov r1, #0xf6000000 @ DMEMC_REG_BASE (PXA3_MDCNFG)
51 add r1, r1, #0x00100000
54 * Preload the TLB entry for accessing the dynamic memory
55 * controller registers. Note that page table lookups will
56 * fail until the dynamic memory controller has been
57 * reinitialised - and that includes MMU page table walks.
58 * This also means that only the dynamic memory controller
59 * can be reliably accessed in the code following standby.
61 ldr r2, [r1] @ Dummy read PXA3_MDCNFG
63 mcr p14, 0, r0, c7, c0, 0
68 ldr r0, [r1, #PXA3_DDR_HCAL] @ Clear (and wait for) HCEN
69 bic r0, r0, #PXA3_DDR_HCAL_HCEN
70 str r0, [r1, #PXA3_DDR_HCAL]
71 1: ldr r0, [r1, #PXA3_DDR_HCAL]
72 tst r0, #PXA3_DDR_HCAL_HCEN
75 ldr r0, [r1, #PXA3_RCOMP] @ Initiate RCOMP
76 orr r0, r0, #PXA3_RCOMP_SWEVAL
77 str r0, [r1, #PXA3_RCOMP]
79 mov r0, #~0 @ Clear interrupts
80 str r0, [r1, #PXA3_DMCISR]
82 ldr r0, [r1, #PXA3_DMCIER] @ set DMIER[EDLP]
83 orr r0, r0, #PXA3_DMCIER_EDLP
84 str r0, [r1, #PXA3_DMCIER]
86 ldr r0, [r1, #PXA3_DDR_HCAL] @ clear HCRNG, set HCPROG, HCEN
87 bic r0, r0, #PXA3_DDR_HCAL_HCRNG
88 orr r0, r0, #PXA3_DDR_HCAL_HCEN | PXA3_DDR_HCAL_HCPROG
89 str r0, [r1, #PXA3_DDR_HCAL]
91 1: ldr r0, [r1, #PXA3_DMCISR]
92 tst r0, #PXA3_DMCIER_EDLP
95 ldr r0, [r1, #PXA3_MDCNFG] @ set PXA3_MDCNFG[DMCEN]
96 orr r0, r0, #PXA3_MDCNFG_DMCEN
97 str r0, [r1, #PXA3_MDCNFG]
98 1: ldr r0, [r1, #PXA3_MDCNFG]
99 tst r0, #PXA3_MDCNFG_DMCEN
102 ldr r0, [r1, #PXA3_DDR_HCAL] @ set PXA3_DDR_HCAL[HCRNG]
103 orr r0, r0, #2 @ HCRNG
104 str r0, [r1, #PXA3_DDR_HCAL]
106 ldr r0, [r1, #PXA3_DMCIER] @ Clear the interrupt
107 bic r0, r0, #0x20000000
108 str r0, [r1, #PXA3_DMCIER]
111 ENTRY(pm_enter_standby_end)