xref: /linux/arch/arm/mach-at91/pm.h (revision d39d0ed196aa1685bb24771e92f78633c66ac9cb)
1 #ifdef CONFIG_ARCH_AT91RM9200
2 #include <mach/at91rm9200_mc.h>
3 
4 /*
5  * The AT91RM9200 goes into self-refresh mode with this command, and will
6  * terminate self-refresh automatically on the next SDRAM access.
7  *
8  * Self-refresh mode is exited as soon as a memory access is made, but we don't
9  * know for sure when that happens. However, we need to restore the low-power
10  * mode if it was enabled before going idle. Restoring low-power mode while
11  * still in self-refresh is "not recommended", but seems to work.
12  */
13 
14 static inline u32 sdram_selfrefresh_enable(void)
15 {
16 	u32 saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
17 
18 	at91_sys_write(AT91_SDRAMC_LPR, 0);
19 	at91_sys_write(AT91_SDRAMC_SRR, 1);
20 	return saved_lpr;
21 }
22 
23 #define sdram_selfrefresh_disable(saved_lpr)	at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
24 
25 #elif defined(CONFIG_ARCH_AT91CAP9)
26 #include <mach/at91cap9_ddrsdr.h>
27 
28 
29 static inline u32 sdram_selfrefresh_enable(void)
30 {
31 	u32 saved_lpr, lpr;
32 
33 	saved_lpr = at91_ramc_read(0, AT91_DDRSDRC_LPR);
34 
35 	lpr = saved_lpr & ~AT91_DDRSDRC_LPCB;
36 	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr | AT91_DDRSDRC_LPCB_SELF_REFRESH);
37 	return saved_lpr;
38 }
39 
40 #define sdram_selfrefresh_disable(saved_lpr)	at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr)
41 
42 #elif defined(CONFIG_ARCH_AT91SAM9G45)
43 #include <mach/at91sam9_ddrsdr.h>
44 
45 /* We manage both DDRAM/SDRAM controllers, we need more than one value to
46  * remember.
47  */
48 static u32 saved_lpr1;
49 
50 static inline u32 sdram_selfrefresh_enable(void)
51 {
52 	/* Those tow values allow us to delay self-refresh activation
53 	 * to the maximum. */
54 	u32 lpr0, lpr1;
55 	u32 saved_lpr0;
56 
57 	saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
58 	lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
59 	lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
60 
61 	saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
62 	lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
63 	lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
64 
65 	/* self-refresh mode now */
66 	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
67 	at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
68 
69 	return saved_lpr0;
70 }
71 
72 #define sdram_selfrefresh_disable(saved_lpr0)	\
73 	do { \
74 		at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0); \
75 		at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); \
76 	} while (0)
77 
78 #else
79 #include <mach/at91sam9_sdramc.h>
80 
81 #ifdef CONFIG_ARCH_AT91SAM9263
82 /*
83  * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use;
84  * handle those cases both here and in the Suspend-To-RAM support.
85  */
86 #warning Assuming EB1 SDRAM controller is *NOT* used
87 #endif
88 
89 static inline u32 sdram_selfrefresh_enable(void)
90 {
91 	u32 saved_lpr, lpr;
92 
93 	saved_lpr = at91_ramc_read(0, AT91_SDRAMC_LPR);
94 
95 	lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
96 	at91_ramc_write(0, AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
97 	return saved_lpr;
98 }
99 
100 #define sdram_selfrefresh_disable(saved_lpr)	at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr)
101 
102 #endif
103