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670c104a TL |
1 | /* |
2 | * linux/arch/arm/mach-omap2/sleep.S | |
3 | * | |
4 | * (C) Copyright 2004 | |
5 | * Texas Instruments, <www.ti.com> | |
6 | * Richard Woodruff <r-woodruff2@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
670c104a TL |
24 | #include <linux/linkage.h> |
25 | #include <asm/assembler.h> | |
26 | #include <asm/arch/io.h> | |
27 | #include <asm/arch/pm.h> | |
28 | ||
29 | #define A_32KSYNC_CR_V IO_ADDRESS(OMAP_TIMER32K_BASE+0x10) | |
30 | #define A_PRCM_VOLTCTRL_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x50) | |
31 | #define A_PRCM_CLKCFG_CTRL_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x80) | |
32 | #define A_CM_CLKEN_PLL_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x500) | |
33 | #define A_CM_IDLEST_CKGEN_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x520) | |
34 | #define A_CM_CLKSEL1_PLL_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x540) | |
35 | #define A_CM_CLKSEL2_PLL_V IO_ADDRESS(OMAP24XX_PRCM_BASE+0x544) | |
36 | ||
37 | #define A_SDRC_DLLA_CTRL_V IO_ADDRESS(OMAP24XX_SDRC_BASE+0x60) | |
38 | #define A_SDRC_POWER_V IO_ADDRESS(OMAP24XX_SDRC_BASE+0x70) | |
39 | #define A_SDRC_RFR_CTRL_V IO_ADDRESS(OMAP24XX_SDRC_BASE+0xA4) | |
40 | #define A_SDRC0_V (0xC0000000) | |
41 | #define A_SDRC_MANUAL_V IO_ADDRESS(OMAP24XX_SDRC_BASE+0xA8) | |
42 | ||
43 | .text | |
44 | ||
45 | /* | |
46 | * Forces OMAP into idle state | |
47 | * | |
48 | * omap24xx_idle_loop_suspend() - This bit of code just executes the WFI | |
49 | * for normal idles. | |
50 | * | |
51 | * Note: This code get's copied to internal SRAM at boot. When the OMAP | |
52 | * wakes up it continues execution at the point it went to sleep. | |
53 | */ | |
54 | ENTRY(omap24xx_idle_loop_suspend) | |
55 | stmfd sp!, {r0, lr} @ save registers on stack | |
56 | mov r0, #0 @ clear for mcr setup | |
57 | mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt | |
58 | ldmfd sp!, {r0, pc} @ restore regs and return | |
59 | ||
60 | ENTRY(omap24xx_idle_loop_suspend_sz) | |
61 | .word . - omap24xx_idle_loop_suspend | |
62 | ||
63 | /* | |
64 | * omap242x_cpu_suspend() - Forces OMAP into deep sleep state by completing | |
65 | * SDRC shutdown then ARM shutdown. Upon wake MPU is back on so just restore | |
66 | * SDRC. | |
67 | * | |
68 | * Input: | |
69 | * R0 : DLL ctrl value pre-Sleep | |
70 | * R1 : Processor+Revision | |
71 | * 2420: 0x21 = 242xES1, 0x26 = 242xES2.2 | |
72 | * 2430: 0x31 = 2430ES1, 0x32 = 2430ES2 | |
73 | * | |
74 | * The if the DPLL is going to AutoIdle. It seems like the DPLL may be back on | |
75 | * when we get called, but the DLL probably isn't. We will wait a bit more in | |
76 | * case the DPLL isn't quite there yet. The code will wait on DLL for DDR even | |
77 | * if in unlocked mode. | |
78 | * | |
79 | * For less than 242x-ES2.2 upon wake from a sleep mode where the external | |
80 | * oscillator was stopped, a timing bug exists where a non-stabilized 12MHz | |
81 | * clock can pass into the PRCM can cause problems at DSP and IVA. | |
82 | * To work around this the code will switch to the 32kHz source prior to sleep. | |
83 | * Post sleep we will shift back to using the DPLL. Apparently, | |
84 | * CM_IDLEST_CLKGEN does not reflect the full clock change so you need to wait | |
85 | * 3x12MHz + 3x32kHz clocks for a full switch. | |
86 | * | |
87 | * The DLL load value is not kept in RETENTION or OFF. It needs to be restored | |
88 | * at wake | |
89 | */ | |
90 | ENTRY(omap24xx_cpu_suspend) | |
91 | stmfd sp!, {r0 - r12, lr} @ save registers on stack | |
92 | mov r3, #0x0 @ clear for mrc call | |
93 | mcr p15, 0, r3, c7, c10, 4 @ memory barrier, hope SDR/DDR finished | |
94 | nop | |
95 | nop | |
96 | ldr r3, A_SDRC_POWER @ addr of sdrc power | |
97 | ldr r4, [r3] @ value of sdrc power | |
98 | orr r4, r4, #0x40 @ enable self refresh on idle req | |
99 | mov r5, #0x2000 @ set delay (DPLL relock + DLL relock) | |
100 | str r4, [r3] @ make it so | |
101 | mov r2, #0 | |
102 | nop | |
103 | mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt | |
104 | nop | |
105 | loop: | |
106 | subs r5, r5, #0x1 @ awake, wait just a bit | |
107 | bne loop | |
108 | ||
109 | /* The DPLL has on before we take the DDR out of self refresh */ | |
110 | bic r4, r4, #0x40 @ now clear self refresh bit. | |
111 | str r4, [r3] @ put vlaue back. | |
112 | ldr r4, A_SDRC0 @ make a clock happen | |
113 | ldr r4, [r4] | |
114 | nop @ start auto refresh only after clk ok | |
115 | movs r0, r0 @ see if DDR or SDR | |
116 | ldrne r1, A_SDRC_DLLA_CTRL_S @ get addr of DLL ctrl | |
117 | strne r0, [r1] @ rewrite DLLA to force DLL reload | |
118 | addne r1, r1, #0x8 @ move to DLLB | |
119 | strne r0, [r1] @ rewrite DLLB to force DLL reload | |
120 | ||
121 | mov r5, #0x1000 | |
122 | loop2: | |
123 | subs r5, r5, #0x1 | |
124 | bne loop2 | |
125 | /* resume*/ | |
126 | ldmfd sp!, {r0 - r12, pc} @ restore regs and return | |
127 | ||
128 | A_SDRC_POWER: | |
129 | .word A_SDRC_POWER_V | |
130 | A_SDRC0: | |
131 | .word A_SDRC0_V | |
132 | A_CM_CLKSEL2_PLL_S: | |
133 | .word A_CM_CLKSEL2_PLL_V | |
134 | A_CM_CLKEN_PLL: | |
135 | .word A_CM_CLKEN_PLL_V | |
136 | A_SDRC_DLLA_CTRL_S: | |
137 | .word A_SDRC_DLLA_CTRL_V | |
138 | A_SDRC_MANUAL_S: | |
139 | .word A_SDRC_MANUAL_V | |
140 | ||
141 | ENTRY(omap24xx_cpu_suspend_sz) | |
142 | .word . - omap24xx_cpu_suspend | |
143 |