Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 107 insertions, 0 deletions

diff --git a/arch/mips/mm/sc-r5k.c b/arch/mips/mm/sc-r5k.c
new file mode 100644
index 000000000..736615d68
--- /dev/null
+++ b/arch/mips/mm/sc-r5k.c
@@ -0,0 +1,107 @@
+// 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/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;
+        }
+}