Commit | Line | Data |
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458eef2f LW |
1 | /* |
2 | * Copyright (C) ST-Ericsson SA 2011 | |
3 | * | |
4 | * License terms: GNU General Public License (GPL) version 2 | |
5 | */ | |
6 | ||
7 | #include <linux/io.h> | |
f1949ea0 LJ |
8 | #include <linux/of.h> |
9 | ||
458eef2f | 10 | #include <asm/hardware/cache-l2x0.h> |
7a4f2609 | 11 | |
174e7796 | 12 | #include "db8500-regs.h" |
7a4f2609 | 13 | #include "id.h" |
458eef2f | 14 | |
a3849a4c AB |
15 | static int __init ux500_l2x0_unlock(void) |
16 | { | |
17 | int i; | |
823e7546 | 18 | void __iomem *l2x0_base = __io_address(U8500_L2CC_BASE); |
a3849a4c AB |
19 | |
20 | /* | |
21 | * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions | |
22 | * apparently locks both caches before jumping to the kernel. The | |
23 | * l2x0 core will not touch the unlock registers if the l2x0 is | |
24 | * already enabled, so we do it right here instead. The PL310 has | |
25 | * 8 sets of registers, one per possible CPU. | |
26 | */ | |
27 | for (i = 0; i < 8; i++) { | |
28 | writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + | |
29 | i * L2X0_LOCKDOWN_STRIDE); | |
30 | writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + | |
31 | i * L2X0_LOCKDOWN_STRIDE); | |
32 | } | |
33 | return 0; | |
34 | } | |
35 | ||
67161733 RK |
36 | static void ux500_l2c310_write_sec(unsigned long val, unsigned reg) |
37 | { | |
38 | /* | |
39 | * We can't write to secure registers as we are in non-secure | |
40 | * mode, until we have some SMI service available. | |
41 | */ | |
42 | } | |
43 | ||
a3849a4c | 44 | static int __init ux500_l2x0_init(void) |
458eef2f | 45 | { |
823e7546 LW |
46 | /* Multiplatform guard */ |
47 | if (!((cpu_is_u8500_family() || cpu_is_ux540_family()))) | |
31c72abb | 48 | return -ENODEV; |
458eef2f | 49 | |
a3849a4c AB |
50 | /* Unlock before init */ |
51 | ux500_l2x0_unlock(); | |
67161733 | 52 | outer_cache.write_sec = ux500_l2c310_write_sec; |
823e7546 | 53 | l2x0_of_init(0, ~0); |
458eef2f | 54 | |
458eef2f LW |
55 | return 0; |
56 | } | |
458eef2f | 57 | early_initcall(ux500_l2x0_init); |