projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | 8 | #include <linux/of.h> |
| 583ecab9 | 9 | #include <linux/of_address.h> |
| f1949ea0 | 10 | |
| 458eef2f | 11 | #include <asm/hardware/cache-l2x0.h> |
| 7a4f2609 | 12 | |
| 174e7796 | 13 | #include "db8500-regs.h" |
| 7a4f2609 | 14 | #include "id.h" |
| 458eef2f | 15 | |
| a3849a4c AB |
16 | static int __init ux500_l2x0_unlock(void) |
| 17 | { | |
| 18 | int i; | |
| 583ecab9 LW |
19 | struct device_node *np; |
| 20 | void __iomem *l2x0_base; | |
| 21 | ||
| 22 | np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache"); | |
| 23 | l2x0_base = of_iomap(np, 0); | |
| 24 | of_node_put(np); | |
| 25 | if (!l2x0_base) | |
| 26 | return -ENODEV; | |
| a3849a4c AB |
27 | |
| 28 | /* | |
| 29 | * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions | |
| 30 | * apparently locks both caches before jumping to the kernel. The | |
| 31 | * l2x0 core will not touch the unlock registers if the l2x0 is | |
| 32 | * already enabled, so we do it right here instead. The PL310 has | |
| 33 | * 8 sets of registers, one per possible CPU. | |
| 34 | */ | |
| 35 | for (i = 0; i < 8; i++) { | |
| 36 | writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + | |
| 37 | i * L2X0_LOCKDOWN_STRIDE); | |
| 38 | writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + | |
| 39 | i * L2X0_LOCKDOWN_STRIDE); | |
| 40 | } | |
| 583ecab9 | 41 | iounmap(l2x0_base); |
| a3849a4c AB |
42 | return 0; |
| 43 | } | |
| 44 | ||
| 67161733 RK |
45 | static void ux500_l2c310_write_sec(unsigned long val, unsigned reg) |
| 46 | { | |
| 47 | /* | |
| 48 | * We can't write to secure registers as we are in non-secure | |
| 49 | * mode, until we have some SMI service available. | |
| 50 | */ | |
| 51 | } | |
| 52 | ||
| a3849a4c | 53 | static int __init ux500_l2x0_init(void) |
| 458eef2f | 54 | { |
| 823e7546 LW |
55 | /* Multiplatform guard */ |
| 56 | if (!((cpu_is_u8500_family() || cpu_is_ux540_family()))) | |
| 31c72abb | 57 | return -ENODEV; |
| 458eef2f | 58 | |
| a3849a4c AB |
59 | /* Unlock before init */ |
| 60 | ux500_l2x0_unlock(); | |
| 67161733 | 61 | outer_cache.write_sec = ux500_l2c310_write_sec; |
| 823e7546 | 62 | l2x0_of_init(0, ~0); |
| 458eef2f | 63 | |
| 458eef2f LW |
64 | return 0; |
| 65 | } | |
| 458eef2f | 66 | early_initcall(ux500_l2x0_init); |