sh: Plug in simple SH-5 subtype probing.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 78 insertions, 2 deletions

diff --git a/arch/sh/kernel/cpu/sh5/Makefile b/arch/sh/kernel/cpu/sh5/Makefile
index 6d388e8d8991..c7a9873c8d57 100644
--- a/arch/sh/kernel/cpu/sh5/Makefile
+++ b/arch/sh/kernel/cpu/sh5/Makefile
@@ -1,4 +1,4 @@
-obj-y := entry.o switchto.o
+obj-y := entry.o probe.o switchto.o
 
-obj-$(CONFIG_KALLSYMS)          += unwind.o
 obj-$(CONFIG_SH_FPU)            += fpu.o
+obj-$(CONFIG_KALLSYMS)          += unwind.o
diff --git a/arch/sh/kernel/cpu/sh5/probe.c b/arch/sh/kernel/cpu/sh5/probe.c
new file mode 100644
index 000000000000..15d167fd0ae7
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh5/probe.c
@@ -0,0 +1,76 @@
+/*
+ * arch/sh/kernel/cpu/sh5/probe.c
+ *
+ * CPU Subtype Probing for SH-5.
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ * Copyright (C) 2003 - 2007  Paul Mundt
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <asm/processor.h>
+#include <asm/cache.h>
+
+int __init detect_cpu_and_cache_system(void)
+{
+        unsigned long long cir;
+
+        /* Do peeks in real mode to avoid having to set up a mapping for the
+           WPC registers. On SH5-101 cut2, such a mapping would be exposed to
+           an address translation erratum which would make it hard to set up
+           correctly. */
+        cir = peek_real_address_q(0x0d000008);
+        if ((cir & 0xffff) == 0x5103) {
+                boot_cpu_data.type = CPU_SH5_103;
+        } else if (((cir >> 32) & 0xffff) == 0x51e2) {
+                /* CPU.VCR aliased at CIR address on SH5-101 */
+                boot_cpu_data.type = CPU_SH5_101;
+        } else {
+                boot_cpu_data.type = CPU_SH_NONE;
+        }
+
+        /*
+         * First, setup some sane values for the I-cache.
+         */
+        boot_cpu_data.icache.ways               = 4;
+        boot_cpu_data.icache.sets               = 256;
+        boot_cpu_data.icache.linesz             = L1_CACHE_BYTES;
+
+#if 0
+        /*
+         * FIXME: This can probably be cleaned up a bit as well.. for example,
+         * do we really need the way shift _and_ the way_step_shift ?? Judging
+         * by the existing code, I would guess no.. is there any valid reason
+         * why we need to be tracking this around?
+         */
+        boot_cpu_data.icache.way_shift          = 13;
+        boot_cpu_data.icache.entry_shift        = 5;
+        boot_cpu_data.icache.set_shift          = 4;
+        boot_cpu_data.icache.way_step_shift     = 16;
+        boot_cpu_data.icache.asid_shift         = 2;
+
+        /*
+         * way offset = cache size / associativity, so just don't factor in
+         * associativity in the first place..
+         */
+        boot_cpu_data.icache.way_ofs    = boot_cpu_data.icache.sets *
+                                          boot_cpu_data.icache.linesz;
+
+        boot_cpu_data.icache.asid_mask          = 0x3fc;
+        boot_cpu_data.icache.idx_mask           = 0x1fe0;
+        boot_cpu_data.icache.epn_mask           = 0xffffe000;
+#endif
+
+        boot_cpu_data.icache.flags              = 0;
+
+        /* A trivial starting point.. */
+        memcpy(&boot_cpu_data.dcache,
+               &boot_cpu_data.icache, sizeof(struct cache_info));
+
+        return 0;
+}