From: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Tomaso Paoletti <tpaoletti@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <Paul.Gortmaker@xxxxxxxxxxxxx>
Signed-off-by: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
---
arch/mips/mm/c-octeon.c | 309 +++++++++++++++++++++++++++++++++++++++++++++++
arch/mips/mm/cex-oct.S | 70 +++++++++++
2 files changed, 379 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/mm/c-octeon.c
create mode 100644 arch/mips/mm/cex-oct.S
diff --git a/arch/mips/mm/c-octeon.c b/arch/mips/mm/c-octeon.c
new file mode 100644
index 0000000..6c96c1a
--- /dev/null
+++ b/arch/mips/mm/c-octeon.c
@@ -0,0 +1,309 @@
+/*
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.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/page.h>
+#include <asm/pgtable.h>
+#include <asm/r4kcache.h>
+#include <asm/system.h>
+#include <asm/mmu_context.h>
+#include <asm/war.h>
+#include "../cavium-octeon/hal.h"
+
+unsigned long long cache_err_dcache[NR_CPUS];
+
+/**
+ * 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
+ *
+ * @param addr
+ */
+static void octeon_flush_data_cache_page(unsigned long addr)
+{
+ /* Nothing to do */
+}
+
+/* Flush local I-cache for the specified range.
+ */
+static inline void local_octeon_flush_icache_range(unsigned long start,
+ unsigned long end)
+{
+ asm volatile ("synci 0($0)\n");
+}
+
+/**
+ * Flush caches as necessary for all cores affected by a
+ * vma. If no vma is supplied, all cores are flushed.
+ *
+ * @param vma VMA to flush or NULL to flush all icaches.
+ */
+static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
+{
+ extern struct plat_smp_ops *mp_ops; /* private */
+#ifdef CONFIG_SMP
+ int i;
+ int cpu;
+#endif
+
+ preempt_disable();
+#ifdef CONFIG_SMP
+ cpu = smp_processor_id();
+#endif
+ mb();
+
+ /* If we have a vma structure, we only need to worry about cores it
+ has been used on */
+ if (vma) {
+#ifdef CONFIG_SMP
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpu_isset(i, vma->vm_mm->cpu_vm_mask) && i != cpu)
+ mp_ops->send_ipi_single(i, SMP_ICACHE_FLUSH);
+#endif
+ asm volatile ("synci 0($0)\n");
+ } else {
+ /* No extra info available. Flush the icache on all cores that
+ are online */
+#ifdef CONFIG_SMP
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpu_online(i) && i != cpu)
+ mp_ops->send_ipi_single(i, SMP_ICACHE_FLUSH);
+#endif
+ asm volatile ("synci 0($0)\n");
+ }
+ preempt_enable();
+}
+
+
+/**
+ * Called to flush the icache on all cores
+ */
+static void octeon_flush_icache_all(void)
+{
+ octeon_flush_icache_all_cores(NULL);
+}
+
+
+/**
+ * Called to flush all memory associated with a memory
+ * context.
+ *
+ * @param 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
+ *
+ * @param start
+ * @param end
+ */
+static void octeon_flush_icache_range(unsigned long start, unsigned long end)
+{
+ octeon_flush_icache_all_cores(NULL);
+}
+
+
+/**
+ * Flush the icache for a trampoline. These are used for interrupt
+ * and exception hooking.
+ *
+ * @param addr Address to flush
+ */
+static void octeon_flush_cache_sigtramp(unsigned long addr)
+{
+ /* Only flush trampolines on the current core */
+ mb();
+ asm volatile ("synci 0(%0)\n" : : "r" (addr));
+}
+
+
+/**
+ * Flush a range out of a vma
+ *
+ * @param vma VMA to flush
+ * @param start
+ * @param end
+ */
+static void octeon_flush_cache_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+ if (vma->vm_flags & (VM_EXEC|VM_EXECUTABLE))
+ octeon_flush_icache_all_cores(vma);
+}
+
+
+/**
+ * Flush a specific page of a vma
+ *
+ * @param vma VMA to flush page for
+ * @param page Page to flush
+ * @param pfn
+ */
+static void octeon_flush_cache_page(struct vm_area_struct *vma,
+ unsigned long page, unsigned long pfn)
+{
+ if (vma->vm_flags & (VM_EXEC|VM_EXECUTABLE))
+ octeon_flush_icache_all_cores(vma);
+}
+
+
+/**
+ * Probe Octeon's caches
+ *
+ * @return
+ */
+static void __devinit probe_octeon(void)
+{
+ unsigned long icache_size;
+ unsigned long dcache_size;
+ unsigned int config1;
+ struct cpuinfo_mips *c = ¤t_cpu_data;
+
+ switch (c->cputype) {
+ case CPU_CAVIUM_OCTEON:
+ config1 = read_c0_config1();
+ 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 (OCTEON_IS_MODEL(OCTEON_CN3XXX))
+ c->dcache.sets = 1; /* CN3XXX has one Dcache set */
+ else
+ c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
+ 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;
+
+ default:
+ panic("Unsupported Cavium Networks CPU type\n");
+ 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_notice("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_notice("Primary data cache %ldkB, %d-way, %d sets, "
+ "linesize %d bytes.\n",
+ dcache_size >> 10, c->dcache.ways,
+ c->dcache.sets, c->dcache.linesz);
+ }
+}
+
+
+/**
+ * Setup the Octeon cache flush routines
+ *
+ * @return
+ */
+void __devinit octeon_cache_init(void)
+{
+ extern unsigned long ebase;
+ extern char except_vec2_octeon;
+
+ memcpy((void *)(ebase + 0x100), &except_vec2_octeon, 0x80);
+ octeon_flush_cache_sigtramp(ebase + 0x100);
+
+ 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_cache_sigtramp = octeon_flush_cache_sigtramp;
+ 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;
+
+ build_clear_page();
+ build_copy_page();
+}
+
+/**
+ * Handle a cache error exception
+ */
+
+static void cache_parity_error_octeon(int non_recoverable)
+{
+ unsigned long coreid = cvmx_get_core_num();
+ uint64_t icache_err = read_c0_cacheerr();
+
+ pr_err("Cache error exception:\n");
+ 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_c0_cacheerr(0);
+ }
+ if (cache_err_dcache[coreid] & 1) {
+ pr_err("CacheErr (Dcache) == %llx\n",
+ (unsigned long long)cache_err_dcache[coreid]);
+ cache_err_dcache[coreid] = 0;
+ }
+
+
+ if (non_recoverable)
+ panic("Can't handle cache error: nested exception");
+}
+
+/**
+ * Called when the the exception is not recoverable
+ */
+
+asmlinkage void cache_parity_error_octeon_recoverable(void)
+{
+ cache_parity_error_octeon(0);
+}
+
+/**
+ * Called when the the exception is recoverable
+ */
+
+asmlinkage void cache_parity_error_octeon_non_recoverable(void)
+{
+ cache_parity_error_octeon(1);
+}
+
diff --git a/arch/mips/mm/cex-oct.S b/arch/mips/mm/cex-oct.S
new file mode 100644
index 0000000..3db8553
--- /dev/null
+++ b/arch/mips/mm/cex-oct.S
@@ -0,0 +1,70 @@
+/*
+ * 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) 2006 Cavium Networks
+ * Cache error handler
+ */
+
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/stackframe.h>
+
+/*
+ * Handle cache error. Indicate to the second level handler whether
+ * the exception is recoverable.
+ */
+ LEAF(except_vec2_octeon)
+
+ .set push
+ .set mips64r2
+ .set noreorder
+ .set noat
+
+
+ /* due to an errata we need to read the COP0 CacheErr (Dcache)
+ * before any cache/DRAM access */
+
+ rdhwr k0, $0 /* get core_id */
+ PTR_LA k1, cache_err_dcache
+ sll k0, k0, 3
+ PTR_ADDU k1, k0, k1 /* k1 = &cache_err_dcache[core_id] */
+
+ dmfc0 k0, CP0_CACHEERR, 1
+ sd k0, (k1)
+ dmtc0 $0, CP0_CACHEERR, 1
+
+ /* check whether this is a nested exception */
+ mfc0 k1, CP0_STATUS
+ andi k1, k1, ST0_EXL
+ beqz k1, 1f
+ nop
+ j cache_parity_error_octeon_non_recoverable
+ nop
+
+ /* exception is recoverable */
+1: j handle_cache_err
+ nop
+
+ .set pop
+ END(except_vec2_octeon)
+
+ /* We need to jump to handle_cache_err so that the previous handler
+ * can fit within 0x80 bytes. We also move from 0xFFFFFFFFAXXXXXXX
+ * space (uncached) to the 0xFFFFFFFF8XXXXXXX space (cached). */
+ LEAF(handle_cache_err)
+ .set push
+ .set noreorder
+ .set noat
+
+ SAVE_ALL
+ KMODE
+ jal cache_parity_error_octeon_recoverable
+ nop
+ j ret_from_exception
+ nop
+
+ .set pop
+ END(handle_cache_err)
--
1.5.5.1
