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>
14 #include <mach/hardware.h>
16 #include <mach/pxa-regs.h>
17 #include <mach/pxa2xx-regs.h>
22 ENTRY(pxa_cpu_standby)
24 mov r1, #(PSSR_PH | PSSR_STS)
25 mov r2, #PWRMODE_STANDBY
26 mov r3, #UNCACHED_PHYS_0 @ Read mem context in.
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
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)
51 ENTRY(pm_enter_standby_start)
52 mov r1, #0xf6000000 @ DMEMC_REG_BASE (PXA3_MDCNFG)
53 add r1, r1, #0x00100000
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.
63 ldr r2, [r1] @ Dummy read PXA3_MDCNFG
65 mcr p14, 0, r0, c7, c0, 0
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
77 ldr r0, [r1, #PXA3_RCOMP] @ Initiate RCOMP
78 orr r0, r0, #PXA3_RCOMP_SWEVAL
79 str r0, [r1, #PXA3_RCOMP]
81 mov r0, #~0 @ Clear interrupts
82 str r0, [r1, #PXA3_DMCISR]
84 ldr r0, [r1, #PXA3_DMCIER] @ set DMIER[EDLP]
85 orr r0, r0, #PXA3_DMCIER_EDLP
86 str r0, [r1, #PXA3_DMCIER]
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]
93 1: ldr r0, [r1, #PXA3_DMCISR]
94 tst r0, #PXA3_DMCIER_EDLP
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
104 ldr r0, [r1, #PXA3_DDR_HCAL] @ set PXA3_DDR_HCAL[HCRNG]
105 orr r0, r0, #2 @ HCRNG
106 str r0, [r1, #PXA3_DDR_HCAL]
108 ldr r0, [r1, #PXA3_DMCIER] @ Clear the interrupt
109 bic r0, r0, #0x20000000
110 str r0, [r1, #PXA3_DMCIER]
113 ENTRY(pm_enter_standby_end)