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-rw-r--r--arch/mips/mm/c-r3k.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/arch/mips/mm/c-r3k.c b/arch/mips/mm/c-r3k.c
new file mode 100644
index 000000000..01848cdf2
--- /dev/null
+++ b/arch/mips/mm/c-r3k.c
@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * r2300.c: R2000 and R3000 specific mmu/cache code.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
+ *
+ * with a lot of changes to make this thing work for R3000s
+ * Tx39XX R4k style caches added. HK
+ * Copyright (C) 1998, 1999, 2000 Harald Koerfgen
+ * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
+ * Copyright (C) 2001, 2004, 2007 Maciej W. Rozycki
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/mmu_context.h>
+#include <asm/isadep.h>
+#include <asm/io.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+
+static unsigned long icache_size, dcache_size; /* Size in bytes */
+static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */
+
+unsigned long r3k_cache_size(unsigned long ca_flags)
+{
+ unsigned long flags, status, dummy, size;
+ volatile unsigned long *p;
+
+ p = (volatile unsigned long *) KSEG0;
+
+ flags = read_c0_status();
+
+ /* isolate cache space */
+ write_c0_status((ca_flags|flags)&~ST0_IEC);
+
+ *p = 0xa5a55a5a;
+ dummy = *p;
+ status = read_c0_status();
+
+ if (dummy != 0xa5a55a5a || (status & ST0_CM)) {
+ size = 0;
+ } else {
+ for (size = 128; size <= 0x40000; size <<= 1)
+ *(p + size) = 0;
+ *p = -1;
+ for (size = 128;
+ (size <= 0x40000) && (*(p + size) == 0);
+ size <<= 1)
+ ;
+ if (size > 0x40000)
+ size = 0;
+ }
+
+ write_c0_status(flags);
+
+ return size * sizeof(*p);
+}
+
+unsigned long r3k_cache_lsize(unsigned long ca_flags)
+{
+ unsigned long flags, status, lsize, i;
+ volatile unsigned long *p;
+
+ p = (volatile unsigned long *) KSEG0;
+
+ flags = read_c0_status();
+
+ /* isolate cache space */
+ write_c0_status((ca_flags|flags)&~ST0_IEC);
+
+ for (i = 0; i < 128; i++)
+ *(p + i) = 0;
+ *(volatile unsigned char *)p = 0;
+ for (lsize = 1; lsize < 128; lsize <<= 1) {
+ *(p + lsize);
+ status = read_c0_status();
+ if (!(status & ST0_CM))
+ break;
+ }
+ for (i = 0; i < 128; i += lsize)
+ *(volatile unsigned char *)(p + i) = 0;
+
+ write_c0_status(flags);
+
+ return lsize * sizeof(*p);
+}
+
+static void r3k_probe_cache(void)
+{
+ dcache_size = r3k_cache_size(ST0_ISC);
+ if (dcache_size)
+ dcache_lsize = r3k_cache_lsize(ST0_ISC);
+
+ icache_size = r3k_cache_size(ST0_ISC|ST0_SWC);
+ if (icache_size)
+ icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC);
+}
+
+static void r3k_flush_icache_range(unsigned long start, unsigned long end)
+{
+ unsigned long size, i, flags;
+ volatile unsigned char *p;
+
+ size = end - start;
+ if (size > icache_size || KSEGX(start) != KSEG0) {
+ start = KSEG0;
+ size = icache_size;
+ }
+ p = (char *)start;
+
+ flags = read_c0_status();
+
+ /* isolate cache space */
+ write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
+
+ for (i = 0; i < size; i += 0x080) {
+ asm( "sb\t$0, 0x000(%0)\n\t"
+ "sb\t$0, 0x004(%0)\n\t"
+ "sb\t$0, 0x008(%0)\n\t"
+ "sb\t$0, 0x00c(%0)\n\t"
+ "sb\t$0, 0x010(%0)\n\t"
+ "sb\t$0, 0x014(%0)\n\t"
+ "sb\t$0, 0x018(%0)\n\t"
+ "sb\t$0, 0x01c(%0)\n\t"
+ "sb\t$0, 0x020(%0)\n\t"
+ "sb\t$0, 0x024(%0)\n\t"
+ "sb\t$0, 0x028(%0)\n\t"
+ "sb\t$0, 0x02c(%0)\n\t"
+ "sb\t$0, 0x030(%0)\n\t"
+ "sb\t$0, 0x034(%0)\n\t"
+ "sb\t$0, 0x038(%0)\n\t"
+ "sb\t$0, 0x03c(%0)\n\t"
+ "sb\t$0, 0x040(%0)\n\t"
+ "sb\t$0, 0x044(%0)\n\t"
+ "sb\t$0, 0x048(%0)\n\t"
+ "sb\t$0, 0x04c(%0)\n\t"
+ "sb\t$0, 0x050(%0)\n\t"
+ "sb\t$0, 0x054(%0)\n\t"
+ "sb\t$0, 0x058(%0)\n\t"
+ "sb\t$0, 0x05c(%0)\n\t"
+ "sb\t$0, 0x060(%0)\n\t"
+ "sb\t$0, 0x064(%0)\n\t"
+ "sb\t$0, 0x068(%0)\n\t"
+ "sb\t$0, 0x06c(%0)\n\t"
+ "sb\t$0, 0x070(%0)\n\t"
+ "sb\t$0, 0x074(%0)\n\t"
+ "sb\t$0, 0x078(%0)\n\t"
+ "sb\t$0, 0x07c(%0)\n\t"
+ : : "r" (p) );
+ p += 0x080;
+ }
+
+ write_c0_status(flags);
+}
+
+static void r3k_flush_dcache_range(unsigned long start, unsigned long end)
+{
+ unsigned long size, i, flags;
+ volatile unsigned char *p;
+
+ size = end - start;
+ if (size > dcache_size || KSEGX(start) != KSEG0) {
+ start = KSEG0;
+ size = dcache_size;
+ }
+ p = (char *)start;
+
+ flags = read_c0_status();
+
+ /* isolate cache space */
+ write_c0_status((ST0_ISC|flags)&~ST0_IEC);
+
+ for (i = 0; i < size; i += 0x080) {
+ asm( "sb\t$0, 0x000(%0)\n\t"
+ "sb\t$0, 0x004(%0)\n\t"
+ "sb\t$0, 0x008(%0)\n\t"
+ "sb\t$0, 0x00c(%0)\n\t"
+ "sb\t$0, 0x010(%0)\n\t"
+ "sb\t$0, 0x014(%0)\n\t"
+ "sb\t$0, 0x018(%0)\n\t"
+ "sb\t$0, 0x01c(%0)\n\t"
+ "sb\t$0, 0x020(%0)\n\t"
+ "sb\t$0, 0x024(%0)\n\t"
+ "sb\t$0, 0x028(%0)\n\t"
+ "sb\t$0, 0x02c(%0)\n\t"
+ "sb\t$0, 0x030(%0)\n\t"
+ "sb\t$0, 0x034(%0)\n\t"
+ "sb\t$0, 0x038(%0)\n\t"
+ "sb\t$0, 0x03c(%0)\n\t"
+ "sb\t$0, 0x040(%0)\n\t"
+ "sb\t$0, 0x044(%0)\n\t"
+ "sb\t$0, 0x048(%0)\n\t"
+ "sb\t$0, 0x04c(%0)\n\t"
+ "sb\t$0, 0x050(%0)\n\t"
+ "sb\t$0, 0x054(%0)\n\t"
+ "sb\t$0, 0x058(%0)\n\t"
+ "sb\t$0, 0x05c(%0)\n\t"
+ "sb\t$0, 0x060(%0)\n\t"
+ "sb\t$0, 0x064(%0)\n\t"
+ "sb\t$0, 0x068(%0)\n\t"
+ "sb\t$0, 0x06c(%0)\n\t"
+ "sb\t$0, 0x070(%0)\n\t"
+ "sb\t$0, 0x074(%0)\n\t"
+ "sb\t$0, 0x078(%0)\n\t"
+ "sb\t$0, 0x07c(%0)\n\t"
+ : : "r" (p) );
+ p += 0x080;
+ }
+
+ write_c0_status(flags);
+}
+
+static inline void r3k_flush_cache_all(void)
+{
+}
+
+static inline void r3k___flush_cache_all(void)
+{
+ r3k_flush_dcache_range(KSEG0, KSEG0 + dcache_size);
+ r3k_flush_icache_range(KSEG0, KSEG0 + icache_size);
+}
+
+static void r3k_flush_cache_mm(struct mm_struct *mm)
+{
+}
+
+static void r3k_flush_cache_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+}
+
+static void r3k_flush_cache_page(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long pfn)
+{
+ unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT);
+ int exec = vma->vm_flags & VM_EXEC;
+ struct mm_struct *mm = vma->vm_mm;
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+
+ pr_debug("cpage[%08llx,%08lx]\n",
+ cpu_context(smp_processor_id(), mm), addr);
+
+ /* No ASID => no such page in the cache. */
+ if (cpu_context(smp_processor_id(), mm) == 0)
+ return;
+
+ pgdp = pgd_offset(mm, addr);
+ pudp = pud_offset(pgdp, addr);
+ pmdp = pmd_offset(pudp, addr);
+ ptep = pte_offset(pmdp, addr);
+
+ /* Invalid => no such page in the cache. */
+ if (!(pte_val(*ptep) & _PAGE_PRESENT))
+ return;
+
+ r3k_flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
+ if (exec)
+ r3k_flush_icache_range(kaddr, kaddr + PAGE_SIZE);
+}
+
+static void local_r3k_flush_data_cache_page(void *addr)
+{
+}
+
+static void r3k_flush_data_cache_page(unsigned long addr)
+{
+}
+
+static void r3k_flush_cache_sigtramp(unsigned long addr)
+{
+ unsigned long flags;
+
+ pr_debug("csigtramp[%08lx]\n", addr);
+
+ flags = read_c0_status();
+
+ write_c0_status(flags&~ST0_IEC);
+
+ /* Fill the TLB to avoid an exception with caches isolated. */
+ asm( "lw\t$0, 0x000(%0)\n\t"
+ "lw\t$0, 0x004(%0)\n\t"
+ : : "r" (addr) );
+
+ write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
+
+ asm( "sb\t$0, 0x000(%0)\n\t"
+ "sb\t$0, 0x004(%0)\n\t"
+ : : "r" (addr) );
+
+ write_c0_status(flags);
+}
+
+static void r3k_flush_kernel_vmap_range(unsigned long vaddr, int size)
+{
+ BUG();
+}
+
+static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size)
+{
+ /* Catch bad driver code */
+ BUG_ON(size == 0);
+
+ iob();
+ r3k_flush_dcache_range(start, start + size);
+}
+
+void r3k_cache_init(void)
+{
+ extern void build_clear_page(void);
+ extern void build_copy_page(void);
+
+ r3k_probe_cache();
+
+ flush_cache_all = r3k_flush_cache_all;
+ __flush_cache_all = r3k___flush_cache_all;
+ flush_cache_mm = r3k_flush_cache_mm;
+ flush_cache_range = r3k_flush_cache_range;
+ flush_cache_page = r3k_flush_cache_page;
+ flush_icache_range = r3k_flush_icache_range;
+ local_flush_icache_range = r3k_flush_icache_range;
+ __flush_icache_user_range = r3k_flush_icache_range;
+ __local_flush_icache_user_range = r3k_flush_icache_range;
+
+ __flush_kernel_vmap_range = r3k_flush_kernel_vmap_range;
+
+ flush_cache_sigtramp = r3k_flush_cache_sigtramp;
+ local_flush_data_cache_page = local_r3k_flush_data_cache_page;
+ flush_data_cache_page = r3k_flush_data_cache_page;
+
+ _dma_cache_wback_inv = r3k_dma_cache_wback_inv;
+ _dma_cache_wback = r3k_dma_cache_wback_inv;
+ _dma_cache_inv = r3k_dma_cache_wback_inv;
+
+ printk("Primary instruction cache %ldkB, linesize %ld bytes.\n",
+ icache_size >> 10, icache_lsize);
+ printk("Primary data cache %ldkB, linesize %ld bytes.\n",
+ dcache_size >> 10, dcache_lsize);
+
+ build_clear_page();
+ build_copy_page();
+}
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