1/* 2 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org), 3 * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com). 4 */ 5#include <linux/init.h> 6#include <linux/kernel.h> 7#include <linux/sched.h> 8#include <linux/mm.h> 9 10#include <asm/mipsregs.h> 11#include <asm/bcache.h> 12#include <asm/cacheops.h> 13#include <asm/page.h> 14#include <asm/pgtable.h> 15#include <asm/system.h> 16#include <asm/mmu_context.h> 17#include <asm/r4kcache.h> 18 19/* Secondary cache size in bytes, if present. */ 20static unsigned long scache_size; 21 22#define SC_LINE 32 23#define SC_PAGE (128*SC_LINE) 24 25static 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 36static 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 60static void r5k_sc_enable(void) 61{ 62 unsigned long flags; 63 64 local_irq_save(flags); 65 set_c0_config(R5K_CONF_SE); 66 blast_r5000_scache(); 67 local_irq_restore(flags); 68} 69 70static void r5k_sc_disable(void) 71{ 72 unsigned long flags; 73 74 local_irq_save(flags); 75 blast_r5000_scache(); 76 clear_c0_config(R5K_CONF_SE); 77 local_irq_restore(flags); 78} 79 80static inline int __init r5k_sc_probe(void) 81{ 82 unsigned long config = read_c0_config(); 83 84 if (config & CONF_SC) 85 return(0); 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 95static 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 102void __cpuinit r5k_sc_init(void) 103{ 104 if (r5k_sc_probe()) { 105 r5k_sc_enable(); 106 bcops = &r5k_sc_ops; 107 } 108} 109