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107 lines
2.1 KiB
107 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 1997, 2001 Ralf Baechle ([email protected]), |
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* derived from r4xx0.c by David S. Miller ([email protected]). |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/mm.h> |
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#include <asm/mipsregs.h> |
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#include <asm/bcache.h> |
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#include <asm/cacheops.h> |
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#include <asm/page.h> |
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#include <asm/mmu_context.h> |
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#include <asm/r4kcache.h> |
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/* Secondary cache size in bytes, if present. */ |
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static unsigned long scache_size; |
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#define SC_LINE 32 |
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#define SC_PAGE (128*SC_LINE) |
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static inline void blast_r5000_scache(void) |
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{ |
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unsigned long start = INDEX_BASE; |
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unsigned long end = start + scache_size; |
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while(start < end) { |
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cache_op(R5K_Page_Invalidate_S, start); |
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start += SC_PAGE; |
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} |
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} |
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static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size) |
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{ |
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unsigned long end, a; |
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/* Catch bad driver code */ |
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BUG_ON(size == 0); |
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if (size >= scache_size) { |
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blast_r5000_scache(); |
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return; |
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} |
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/* On the R5000 secondary cache we cannot |
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* invalidate less than a page at a time. |
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* The secondary cache is physically indexed, write-through. |
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*/ |
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a = addr & ~(SC_PAGE - 1); |
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end = (addr + size - 1) & ~(SC_PAGE - 1); |
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while (a <= end) { |
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cache_op(R5K_Page_Invalidate_S, a); |
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a += SC_PAGE; |
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} |
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} |
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static void r5k_sc_enable(void) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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set_c0_config(R5K_CONF_SE); |
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blast_r5000_scache(); |
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local_irq_restore(flags); |
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} |
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static void r5k_sc_disable(void) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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blast_r5000_scache(); |
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clear_c0_config(R5K_CONF_SE); |
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local_irq_restore(flags); |
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} |
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static inline int __init r5k_sc_probe(void) |
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{ |
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unsigned long config = read_c0_config(); |
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if (config & CONF_SC) |
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return 0; |
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scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20); |
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printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n", |
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scache_size >> 10); |
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return 1; |
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} |
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static struct bcache_ops r5k_sc_ops = { |
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.bc_enable = r5k_sc_enable, |
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.bc_disable = r5k_sc_disable, |
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.bc_wback_inv = r5k_dma_cache_inv_sc, |
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.bc_inv = r5k_dma_cache_inv_sc |
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}; |
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void r5k_sc_init(void) |
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{ |
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if (r5k_sc_probe()) { |
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r5k_sc_enable(); |
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bcops = &r5k_sc_ops; |
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} |
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}
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