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> | |
| 8 | #include <asm/cacheflush.h> | |
| 9 | #include <asm/hardware/cache-l2x0.h> | |
| 10 | #include <mach/hardware.h> | |
| 11 | #include <mach/id.h> | |
| 12 | ||
| 13 | static void __iomem *l2x0_base; | |
| 14 | ||
| 15 | static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask) | |
| 16 | { | |
| 17 | /* wait for the operation to complete */ | |
| 18 | while (readl_relaxed(reg) & mask) | |
| 19 | cpu_relax(); | |
| 20 | } | |
| 21 | ||
| 22 | static inline void ux500_cache_sync(void) | |
| 23 | { | |
| 24 | writel_relaxed(0, l2x0_base + L2X0_CACHE_SYNC); | |
| 25 | ux500_cache_wait(l2x0_base + L2X0_CACHE_SYNC, 1); | |
| 26 | } | |
| 27 | ||
| 28 | /* | |
| 29 | * The L2 cache cannot be turned off in the non-secure world. | |
| 30 | * Dummy until a secure service is in place. | |
| 31 | */ | |
| 32 | static void ux500_l2x0_disable(void) | |
| 33 | { | |
| 34 | } | |
| 35 | ||
| 36 | /* | |
| 37 | * This is only called when doing a kexec, just after turning off the L2 | |
| 38 | * and L1 cache, and it is surrounded by a spinlock in the generic version. | |
| 39 | * However, we're not really turning off the L2 cache right now and the | |
| 40 | * PL310 does not support exclusive accesses (used to implement the spinlock). | |
| 41 | * So, the invalidation needs to be done without the spinlock. | |
| 42 | */ | |
| 43 | static void ux500_l2x0_inv_all(void) | |
| 44 | { | |
| 45 | uint32_t l2x0_way_mask = (1<<16) - 1; /* Bitmask of active ways */ | |
| 46 | ||
| 47 | /* invalidate all ways */ | |
| 48 | writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY); | |
| 49 | ux500_cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask); | |
| 50 | ux500_cache_sync(); | |
| 51 | } | |
| 52 | ||
| 53 | static int ux500_l2x0_init(void) | |
| 54 | { | |
| 55 | if (cpu_is_u5500()) | |
| 56 | l2x0_base = __io_address(U5500_L2CC_BASE); | |
| 57 | else if (cpu_is_u8500()) | |
| 58 | l2x0_base = __io_address(U8500_L2CC_BASE); | |
| 59 | else | |
| 60 | ux500_unknown_soc(); | |
| 61 | ||
| 62 | /* 64KB way size, 8 way associativity, force WA */ | |
| 63 | l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff); | |
| 64 | ||
| 65 | /* Override invalidate function */ | |
| 66 | outer_cache.disable = ux500_l2x0_disable; | |
| 67 | outer_cache.inv_all = ux500_l2x0_inv_all; | |
| 68 | ||
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | early_initcall(ux500_l2x0_init); |