// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org), * derived from r4xx0.c by David S. Miller (davem@davemloft.net). */ #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/mmu_context.h> #include <asm/r4kcache.h> /* Secondary cache size in bytes, if present. */ static unsigned long scache_size; #define SC_LINE 32 #define SC_PAGE (128*SC_LINE) static inline void blast_r5000_scache(void) { unsigned long start = INDEX_BASE; unsigned long end = start + scache_size; while(start < end) { cache_op(R5K_Page_Invalidate_S, start); 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(R5K_Page_Invalidate_S, a); a += SC_PAGE; } } static void r5k_sc_enable(void) { unsigned long flags; local_irq_save(flags); set_c0_config(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(); clear_c0_config(R5K_CONF_SE); 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 r5k_sc_init(void) { if (r5k_sc_probe()) { r5k_sc_enable(); bcops = &r5k_sc_ops; } }