projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 1da177e4 LT |
2 | /* |
| 3 | * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org), | |
| 79add627 | 4 | * derived from r4xx0.c by David S. Miller (davem@davemloft.net). |
| 1da177e4 LT |
5 | */ |
| 6 | #include <linux/init.h> | |
| 7 | #include <linux/kernel.h> | |
| 8 | #include <linux/sched.h> | |
| 9 | #include <linux/mm.h> | |
| 10 | ||
| 11 | #include <asm/mipsregs.h> | |
| 12 | #include <asm/bcache.h> | |
| 13 | #include <asm/cacheops.h> | |
| 14 | #include <asm/page.h> | |
| 15 | #include <asm/pgtable.h> | |
| 1da177e4 LT |
16 | #include <asm/mmu_context.h> |
| 17 | #include <asm/r4kcache.h> | |
| 18 | ||
| 19 | /* Secondary cache size in bytes, if present. */ | |
| 20 | static unsigned long scache_size; | |
| 21 | ||
| 22 | #define SC_LINE 32 | |
| 23 | #define SC_PAGE (128*SC_LINE) | |
| 24 | ||
| 25 | static inline void blast_r5000_scache(void) | |
| 26 | { | |
| 27 | unsigned long start = INDEX_BASE; | |
| 28 | unsigned long end = start + scache_size; | |
| 29 | ||
| 30 | while(start < end) { | |
| 31 | cache_op(R5K_Page_Invalidate_S, start); | |
| 32 | start += SC_PAGE; | |
| 33 | } | |
| 34 | } | |
| 35 | ||
| 36 | static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size) | |
| 37 | { | |
| 38 | unsigned long end, a; | |
| 39 | ||
| 40 | /* Catch bad driver code */ | |
| 41 | BUG_ON(size == 0); | |
| 42 | ||
| 43 | if (size >= scache_size) { | |
| 44 | blast_r5000_scache(); | |
| 45 | return; | |
| 46 | } | |
| 47 | ||
| 48 | /* On the R5000 secondary cache we cannot | |
| 49 | * invalidate less than a page at a time. | |
| 50 | * The secondary cache is physically indexed, write-through. | |
| 51 | */ | |
| 52 | a = addr & ~(SC_PAGE - 1); | |
| 53 | end = (addr + size - 1) & ~(SC_PAGE - 1); | |
| 54 | while (a <= end) { | |
| 55 | cache_op(R5K_Page_Invalidate_S, a); | |
| 56 | a += SC_PAGE; | |
| 57 | } | |
| 58 | } | |
| 59 | ||
| 60 | static void r5k_sc_enable(void) | |
| 61 | { | |
| 70342287 | 62 | unsigned long flags; |
| 1da177e4 LT |
63 | |
| 64 | local_irq_save(flags); | |
| 65 | set_c0_config(R5K_CONF_SE); | |
| 66 | blast_r5000_scache(); | |
| 67 | local_irq_restore(flags); | |
| 68 | } | |
| 69 | ||
| 70 | static void r5k_sc_disable(void) | |
| 71 | { | |
| 70342287 | 72 | unsigned long flags; |
| 1da177e4 LT |
73 | |
| 74 | local_irq_save(flags); | |
| 75 | blast_r5000_scache(); | |
| 76 | clear_c0_config(R5K_CONF_SE); | |
| 77 | local_irq_restore(flags); | |
| 78 | } | |
| 79 | ||
| 80 | static inline int __init r5k_sc_probe(void) | |
| 81 | { | |
| 82 | unsigned long config = read_c0_config(); | |
| 83 | ||
| 84 | if (config & CONF_SC) | |
| 635c9907 | 85 | return 0; |
| 1da177e4 LT |
86 | |
| 87 | scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20); | |
| 88 | ||
| 89 | printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n", | |
| 90 | scache_size >> 10); | |
| 91 | ||
| 92 | return 1; | |
| 93 | } | |
| 94 | ||
| 95 | static struct bcache_ops r5k_sc_ops = { | |
| 96 | .bc_enable = r5k_sc_enable, | |
| 97 | .bc_disable = r5k_sc_disable, | |
| 98 | .bc_wback_inv = r5k_dma_cache_inv_sc, | |
| 99 | .bc_inv = r5k_dma_cache_inv_sc | |
| 100 | }; | |
| 101 | ||
| 078a55fc | 102 | void r5k_sc_init(void) |
| 1da177e4 LT |
103 | { |
| 104 | if (r5k_sc_probe()) { | |
| 105 | r5k_sc_enable(); | |
| 106 | bcops = &r5k_sc_ops; | |
| 107 | } | |
| 108 | } |