1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * arch/arm/mach-tegra/sleep.S
4 *
5 * Copyright (c) 2010-2011, NVIDIA Corporation.
6 * Copyright (c) 2011, Google, Inc.
7 *
8 * Author: Colin Cross <ccross@android.com>
9 * Gary King <gking@nvidia.com>
10 */
11
12 #include <linux/linkage.h>
13
14 #include <asm/assembler.h>
15 #include <asm/cache.h>
16 #include <asm/cp15.h>
17 #include <asm/hardware/cache-l2x0.h>
18
19 #include "iomap.h"
20 #include "sleep.h"
21
22 #define CLK_RESET_CCLK_BURST 0x20
23 #define CLK_RESET_CCLK_DIVIDER 0x24
24
25 .arch armv7-a
26
27 #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
28 /*
29 * tegra_disable_clean_inv_dcache
30 *
31 * disable, clean & invalidate the D-cache
32 *
33 * Corrupted registers: r1-r3, r6, r8, r9-r11
34 */
35 ENTRY(tegra_disable_clean_inv_dcache)
36 stmfd sp!, {r0, r4-r5, r7, r9-r11, lr}
37 dmb @ ensure ordering
38
39 /* Disable the D-cache */
40 mrc p15, 0, r2, c1, c0, 0
41 tst r2, #CR_C @ see tegra_sleep_cpu()
42 bic r2, r2, #CR_C
43 mcrne p15, 0, r2, c1, c0, 0
44 isb
45
46 /* Flush the D-cache */
47 cmp r0, #TEGRA_FLUSH_CACHE_ALL
48 blne v7_flush_dcache_louis
49 bleq v7_flush_dcache_all
50
51 /* Trun off coherency */
52 exit_smp r4, r5
53
54 ldmfd sp!, {r0, r4-r5, r7, r9-r11, pc}
55 ENDPROC(tegra_disable_clean_inv_dcache)
56 #endif
57
58 #ifdef CONFIG_PM_SLEEP
59 /*
60 * tegra_init_l2_for_a15
61 *
62 * set up the correct L2 cache data RAM latency
63 */
64 ENTRY(tegra_init_l2_for_a15)
65 mrc p15, 0, r0, c0, c0, 5
66 ubfx r0, r0, #8, #4
67 tst r0, #1 @ only need for cluster 0
68 bne _exit_init_l2_a15
69
70 mrc p15, 0x1, r0, c9, c0, 2
71 and r0, r0, #7
72 cmp r0, #2
73 bicne r0, r0, #7
74 orrne r0, r0, #2
75 mcrne p15, 0x1, r0, c9, c0, 2
76 _exit_init_l2_a15:
77
78 ret lr
79 ENDPROC(tegra_init_l2_for_a15)
80
81 /*
82 * tegra_sleep_cpu_finish(unsigned long v2p)
83 *
84 * enters suspend in LP2 by turning off the mmu and jumping to
85 * tegra?_tear_down_cpu
86 */
87 ENTRY(tegra_sleep_cpu_finish)
88 mov r4, r0
89 /* Flush and disable the L1 data cache */
90 mov r0, #TEGRA_FLUSH_CACHE_ALL
91 bl tegra_disable_clean_inv_dcache
92
93 mov r0, r4
94 mov32 r6, tegra_tear_down_cpu
95 ldr r1, [r6]
96 add r1, r1, r0
97
98 mov32 r3, tegra_shut_off_mmu
99 add r3, r3, r0
100 mov r0, r1
101
102 ret r3
103 ENDPROC(tegra_sleep_cpu_finish)
104
105 /*
106 * tegra_shut_off_mmu
107 *
108 * r0 = physical address to jump to with mmu off
109 *
110 * called with VA=PA mapping
111 * turns off MMU, icache, dcache and branch prediction
112 */
113 .align L1_CACHE_SHIFT
114 .pushsection .idmap.text, "ax"
115 ENTRY(tegra_shut_off_mmu)
116 mrc p15, 0, r3, c1, c0, 0
117 movw r2, #CR_I | CR_Z | CR_C | CR_M
118 bic r3, r3, r2
119 dsb
120 mcr p15, 0, r3, c1, c0, 0
121 isb
122 #ifdef CONFIG_CACHE_L2X0
123 /* Disable L2 cache */
124 check_cpu_part_num 0xc09, r9, r10
125 retne r0
126
127 mov32 r2, TEGRA_ARM_PERIF_BASE + 0x3000
128 ldr r3, [r2, #L2X0_CTRL]
129 tst r3, #L2X0_CTRL_EN @ see tegra_sleep_cpu()
130 mov r3, #0
131 strne r3, [r2, #L2X0_CTRL]
132 #endif
133 ret r0
134 ENDPROC(tegra_shut_off_mmu)
135 .popsection
136
137 /*
138 * tegra_switch_cpu_to_pllp
139 *
140 * In LP2 the normal cpu clock pllx will be turned off. Switch the CPU to pllp
141 */
142 ENTRY(tegra_switch_cpu_to_pllp)
143 /* in LP2 idle (SDRAM active), set the CPU burst policy to PLLP */
144 mov32 r5, TEGRA_CLK_RESET_BASE
145 mov r0, #(2 << 28) @ burst policy = run mode
146 orr r0, r0, #(4 << 4) @ use PLLP in run mode burst
147 str r0, [r5, #CLK_RESET_CCLK_BURST]
148 mov r0, #0
149 str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
150 ret lr
151 ENDPROC(tegra_switch_cpu_to_pllp)
152 #endif
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