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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | /* * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org), * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com). */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <asm/mipsregs.h> #include <asm/bcache.h> #include <asm/cacheops.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/mmu_context.h> /* Secondary cache size in bytes, if present. */ static unsigned long scache_size; #define SC_LINE 32 #define SC_PAGE (128*SC_LINE) #define cache_op(base,op) \ __asm__ __volatile__(" \ .set noreorder; \ .set mips3; \ cache %1, (%0); \ .set mips0; \ .set reorder" \ : \ : "r" (base), \ "i" (op)); static inline void blast_r5000_scache(void) { unsigned long start = KSEG0; unsigned long end = KSEG0 + scache_size; while(start < end) { cache_op(start, R5K_Page_Invalidate_S); start += SC_PAGE; } } static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size) { unsigned long end, a; /* Catch bad driver code */ BUG_ON(size == 0); if (size >= scache_size) { blast_r5000_scache(); return; } /* On the R5000 secondary cache we cannot * invalidate less than a page at a time. * The secondary cache is physically indexed, write-through. */ a = addr & ~(SC_PAGE - 1); end = (addr + size - 1) & ~(SC_PAGE - 1); while (a <= end) { cache_op(a, R5K_Page_Invalidate_S); a += SC_PAGE; } } static void r5k_sc_enable(void) { unsigned long flags; local_irq_save(flags); change_c0_config(R5K_CONF_SE, R5K_CONF_SE); blast_r5000_scache(); local_irq_restore(flags); } static void r5k_sc_disable(void) { unsigned long flags; local_irq_save(flags); blast_r5000_scache(); change_c0_config(R5K_CONF_SE, 0); local_irq_restore(flags); } static inline int __init r5k_sc_probe(void) { unsigned long config = read_c0_config(); if (config & CONF_SC) return(0); scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20); printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n", scache_size >> 10); return 1; } static struct bcache_ops r5k_sc_ops = { .bc_enable = r5k_sc_enable, .bc_disable = r5k_sc_disable, .bc_wback_inv = r5k_dma_cache_inv_sc, .bc_inv = r5k_dma_cache_inv_sc }; void __init r5k_sc_init(void) { if (r5k_sc_probe()) { r5k_sc_enable(); bcops = &r5k_sc_ops; } } |