1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * L2C-310 early resume code. This can be used by platforms to restore
4 * the settings of their L2 cache controller before restoring the
5 * processor state.
6 *
7 * This code can only be used to if you are running in the secure world.
8 */
9 #include <linux/linkage.h>
10 #include <asm/assembler.h>
11 #include <asm/hardware/cache-l2x0.h>
12
13 .text
14
15 ENTRY(l2c310_early_resume)
16 adr r0, 1f
17 ldr r2, [r0]
18 add r0, r2, r0
19
20 ldmia r0, {r1, r2, r3, r4, r5, r6, r7, r8}
21 @ r1 = phys address of L2C-310 controller
22 @ r2 = aux_ctrl
23 @ r3 = tag_latency
24 @ r4 = data_latency
25 @ r5 = filter_start
26 @ r6 = filter_end
27 @ r7 = prefetch_ctrl
28 @ r8 = pwr_ctrl
29
30 @ Check that the address has been initialised
31 teq r1, #0
32 reteq lr
33
34 @ The prefetch and power control registers are revision dependent
35 @ and can be written whether or not the L2 cache is enabled
36 ldr r0, [r1, #L2X0_CACHE_ID]
37 and r0, r0, #L2X0_CACHE_ID_RTL_MASK
38 cmp r0, #L310_CACHE_ID_RTL_R2P0
39 strcs r7, [r1, #L310_PREFETCH_CTRL]
40 cmp r0, #L310_CACHE_ID_RTL_R3P0
41 strcs r8, [r1, #L310_POWER_CTRL]
42
43 @ Don't setup the L2 cache if it is already enabled
44 ldr r0, [r1, #L2X0_CTRL]
45 tst r0, #L2X0_CTRL_EN
46 retne lr
47
48 str r3, [r1, #L310_TAG_LATENCY_CTRL]
49 str r4, [r1, #L310_DATA_LATENCY_CTRL]
50 str r6, [r1, #L310_ADDR_FILTER_END]
51 str r5, [r1, #L310_ADDR_FILTER_START]
52
53 str r2, [r1, #L2X0_AUX_CTRL]
54 mov r9, #L2X0_CTRL_EN
55 str r9, [r1, #L2X0_CTRL]
56 ret lr
57 ENDPROC(l2c310_early_resume)
58
59 .align
60 1: .long l2x0_saved_regs - .
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