1 files changed, 355 insertions, 0 deletions
diff --git a/arch/mips/mm/c-octeon.c b/arch/mips/mm/c-octeon.c
new file mode 100644
index 0000000000..b7393b61cf
--- /dev/null
+++ b/arch/mips/mm/c-octeon.c
@@ -0,0 +1,355 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005-2007 Cavium Networks
+ */
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+#include <linux/bitops.h>
+#include <linux/cpu.h>
+#include <linux/io.h>
+
+#include <asm/bcache.h>
+#include <asm/bootinfo.h>
+#include <asm/cacheops.h>
+#include <asm/cpu-features.h>
+#include <asm/cpu-type.h>
+#include <asm/page.h>
+#include <asm/r4kcache.h>
+#include <asm/traps.h>
+#include <asm/mmu_context.h>
+
+#include <asm/octeon/octeon.h>
+
+unsigned long long cache_err_dcache[NR_CPUS];
+EXPORT_SYMBOL_GPL(cache_err_dcache);
+
+/*
+ * Octeon automatically flushes the dcache on tlb changes, so
+ * from Linux's viewpoint it acts much like a physically
+ * tagged cache. No flushing is needed
+ *
+ */
+static void octeon_flush_data_cache_page(unsigned long addr)
+{
+    /* Nothing to do */
+}
+
+static inline void octeon_local_flush_icache(void)
+{
+	asm volatile ("synci 0($0)");
+}
+
+/*
+ * Flush local I-cache for the specified range.
+ */
+static void local_octeon_flush_icache_range(unsigned long start,
+					    unsigned long end)
+{
+	octeon_local_flush_icache();
+}
+
+/**
+ * octeon_flush_icache_all_cores -  Flush caches as necessary for all cores
+ * affected by a vma. If no vma is supplied, all cores are flushed.
+ *
+ * @vma:    VMA to flush or NULL to flush all icaches.
+ */
+static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
+{
+	extern void octeon_send_ipi_single(int cpu, unsigned int action);
+#ifdef CONFIG_SMP
+	int cpu;
+	cpumask_t mask;
+#endif
+
+	mb();
+	octeon_local_flush_icache();
+#ifdef CONFIG_SMP
+	preempt_disable();
+	cpu = smp_processor_id();
+
+	/*
+	 * If we have a vma structure, we only need to worry about
+	 * cores it has been used on
+	 */
+	if (vma)
+		mask = *mm_cpumask(vma->vm_mm);
+	else
+		mask = *cpu_online_mask;
+	cpumask_clear_cpu(cpu, &mask);
+#ifdef CONFIG_CAVIUM_OCTEON_SOC
+	for_each_cpu(cpu, &mask)
+		octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
+#else
+	smp_call_function_many(&mask, (smp_call_func_t)octeon_local_flush_icache,
+			       NULL, 1);
+#endif
+
+	preempt_enable();
+#endif
+}
+
+
+/*
+ * Called to flush the icache on all cores
+ */
+static void octeon_flush_icache_all(void)
+{
+	octeon_flush_icache_all_cores(NULL);
+}
+
+
+/**
+ * octeon_flush_cache_mm - flush all memory associated with a memory context.
+ *
+ * @mm:	    Memory context to flush
+ */
+static void octeon_flush_cache_mm(struct mm_struct *mm)
+{
+	/*
+	 * According to the R4K version of this file, CPUs without
+	 * dcache aliases don't need to do anything here
+	 */
+}
+
+
+/*
+ * Flush a range of kernel addresses out of the icache
+ *
+ */
+static void octeon_flush_icache_range(unsigned long start, unsigned long end)
+{
+	octeon_flush_icache_all_cores(NULL);
+}
+
+
+/**
+ * octeon_flush_cache_range - Flush a range out of a vma
+ *
+ * @vma:    VMA to flush
+ * @start:  beginning address for flush
+ * @end:    ending address for flush
+ */
+static void octeon_flush_cache_range(struct vm_area_struct *vma,
+				     unsigned long start, unsigned long end)
+{
+	if (vma->vm_flags & VM_EXEC)
+		octeon_flush_icache_all_cores(vma);
+}
+
+
+/**
+ * octeon_flush_cache_page - Flush a specific page of a vma
+ *
+ * @vma:    VMA to flush page for
+ * @page:   Page to flush
+ * @pfn:    Page frame number
+ */
+static void octeon_flush_cache_page(struct vm_area_struct *vma,
+				    unsigned long page, unsigned long pfn)
+{
+	if (vma->vm_flags & VM_EXEC)
+		octeon_flush_icache_all_cores(vma);
+}
+
+static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
+{
+	BUG();
+}
+
+/*
+ * Probe Octeon's caches
+ *
+ */
+static void probe_octeon(void)
+{
+	unsigned long icache_size;
+	unsigned long dcache_size;
+	unsigned int config1;
+	struct cpuinfo_mips *c = &current_cpu_data;
+	int cputype = current_cpu_type();
+
+	config1 = read_c0_config1();
+	switch (cputype) {
+	case CPU_CAVIUM_OCTEON:
+	case CPU_CAVIUM_OCTEON_PLUS:
+		c->icache.linesz = 2 << ((config1 >> 19) & 7);
+		c->icache.sets = 64 << ((config1 >> 22) & 7);
+		c->icache.ways = 1 + ((config1 >> 16) & 7);
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		icache_size =
+			c->icache.sets * c->icache.ways * c->icache.linesz;
+		c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
+		c->dcache.linesz = 128;
+		if (cputype == CPU_CAVIUM_OCTEON_PLUS)
+			c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
+		else
+			c->dcache.sets = 1; /* CN3XXX has one Dcache set */
+		c->dcache.ways = 64;
+		dcache_size =
+			c->dcache.sets * c->dcache.ways * c->dcache.linesz;
+		c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_CAVIUM_OCTEON2:
+		c->icache.linesz = 2 << ((config1 >> 19) & 7);
+		c->icache.sets = 8;
+		c->icache.ways = 37;
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
+
+		c->dcache.linesz = 128;
+		c->dcache.ways = 32;
+		c->dcache.sets = 8;
+		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	case CPU_CAVIUM_OCTEON3:
+		c->icache.linesz = 128;
+		c->icache.sets = 16;
+		c->icache.ways = 39;
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
+
+		c->dcache.linesz = 128;
+		c->dcache.ways = 32;
+		c->dcache.sets = 8;
+		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
+	default:
+		panic("Unsupported Cavium Networks CPU type");
+		break;
+	}
+
+	/* compute a couple of other cache variables */
+	c->icache.waysize = icache_size / c->icache.ways;
+	c->dcache.waysize = dcache_size / c->dcache.ways;
+
+	c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
+	c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
+
+	if (smp_processor_id() == 0) {
+		pr_info("Primary instruction cache %ldkB, %s, %d way, "
+			"%d sets, linesize %d bytes.\n",
+			icache_size >> 10,
+			cpu_has_vtag_icache ?
+				"virtually tagged" : "physically tagged",
+			c->icache.ways, c->icache.sets, c->icache.linesz);
+
+		pr_info("Primary data cache %ldkB, %d-way, %d sets, "
+			"linesize %d bytes.\n",
+			dcache_size >> 10, c->dcache.ways,
+			c->dcache.sets, c->dcache.linesz);
+	}
+}
+
+static void  octeon_cache_error_setup(void)
+{
+	extern char except_vec2_octeon;
+	set_handler(0x100, &except_vec2_octeon, 0x80);
+}
+
+/*
+ * Setup the Octeon cache flush routines
+ *
+ */
+void octeon_cache_init(void)
+{
+	probe_octeon();
+
+	shm_align_mask = PAGE_SIZE - 1;
+
+	flush_cache_all			= octeon_flush_icache_all;
+	__flush_cache_all		= octeon_flush_icache_all;
+	flush_cache_mm			= octeon_flush_cache_mm;
+	flush_cache_page		= octeon_flush_cache_page;
+	flush_cache_range		= octeon_flush_cache_range;
+	flush_icache_all		= octeon_flush_icache_all;
+	flush_data_cache_page		= octeon_flush_data_cache_page;
+	flush_icache_range		= octeon_flush_icache_range;
+	local_flush_icache_range	= local_octeon_flush_icache_range;
+	__flush_icache_user_range	= octeon_flush_icache_range;
+	__local_flush_icache_user_range	= local_octeon_flush_icache_range;
+
+	__flush_kernel_vmap_range	= octeon_flush_kernel_vmap_range;
+
+	build_clear_page();
+	build_copy_page();
+
+	board_cache_error_setup = octeon_cache_error_setup;
+}
+
+/*
+ * Handle a cache error exception
+ */
+static RAW_NOTIFIER_HEAD(co_cache_error_chain);
+
+int register_co_cache_error_notifier(struct notifier_block *nb)
+{
+	return raw_notifier_chain_register(&co_cache_error_chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
+
+int unregister_co_cache_error_notifier(struct notifier_block *nb)
+{
+	return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
+
+static void co_cache_error_call_notifiers(unsigned long val)
+{
+	int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
+	if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
+		u64 dcache_err;
+		unsigned long coreid = cvmx_get_core_num();
+		u64 icache_err = read_octeon_c0_icacheerr();
+
+		if (val) {
+			dcache_err = cache_err_dcache[coreid];
+			cache_err_dcache[coreid] = 0;
+		} else {
+			dcache_err = read_octeon_c0_dcacheerr();
+		}
+
+		pr_err("Core%lu: Cache error exception:\n", coreid);
+		pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
+		if (icache_err & 1) {
+			pr_err("CacheErr (Icache) == %llx\n",
+			       (unsigned long long)icache_err);
+			write_octeon_c0_icacheerr(0);
+		}
+		if (dcache_err & 1) {
+			pr_err("CacheErr (Dcache) == %llx\n",
+			       (unsigned long long)dcache_err);
+		}
+	}
+}
+
+/*
+ * Called when the exception is recoverable
+ */
+
+asmlinkage void cache_parity_error_octeon_recoverable(void)
+{
+	co_cache_error_call_notifiers(0);
+}
+
+/*
+ * Called when the exception is not recoverable
+ */
+
+asmlinkage void cache_parity_error_octeon_non_recoverable(void)
+{
+	co_cache_error_call_notifiers(1);
+	panic("Can't handle cache error: nested exception");
+}