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authorKevin Hilman <khilman@deeprootsystems.com>2009-03-20 17:37:21 -0700
committerKevin Hilman <khilman@deeprootsystems.com>2009-04-23 09:27:59 -0700
commite653034e66ec406f37427f588115badc6fc6af64 (patch)
treed30b5486bf2ef34d4eab79f7632f95065c96a297 /arch
parent9232fcc99948e39d5be04fc1c1025bd4f7998739 (diff)
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davinci: add runtime CPU detection support
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-davinci/id.c29
-rw-r--r--arch/arm/mach-davinci/include/mach/cputype.h49
2 files changed, 75 insertions, 3 deletions
diff --git a/arch/arm/mach-davinci/id.c b/arch/arm/mach-davinci/id.c
index bf067d6..379f2ba 100644
--- a/arch/arm/mach-davinci/id.c
+++ b/arch/arm/mach-davinci/id.c
@@ -17,6 +17,8 @@
#define JTAG_ID_BASE 0x01c40028
+static unsigned int davinci_revision;
+
struct davinci_id {
u8 variant; /* JTAG ID bits 31:28 */
u16 part_no; /* JTAG ID bits 27:12 */
@@ -33,6 +35,20 @@ static struct davinci_id davinci_ids[] __initdata = {
.manufacturer = 0x017,
.type = 0x64460000,
},
+ {
+ /* DM646X */
+ .part_no = 0xb770,
+ .variant = 0x0,
+ .manufacturer = 0x017,
+ .type = 0x64670000,
+ },
+ {
+ /* DM355 */
+ .part_no = 0xb73b,
+ .variant = 0x0,
+ .manufacturer = 0x00f,
+ .type = 0x03550000,
+ },
};
/*
@@ -63,6 +79,12 @@ static u8 __init davinci_get_variant(void)
return variant;
}
+unsigned int davinci_rev(void)
+{
+ return davinci_revision >> 16;
+}
+EXPORT_SYMBOL(davinci_rev);
+
void __init davinci_check_revision(void)
{
int i;
@@ -75,7 +97,7 @@ void __init davinci_check_revision(void)
/* First check only the major version in a safe way */
for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
if (part_no == (davinci_ids[i].part_no)) {
- system_rev = davinci_ids[i].type;
+ davinci_revision = davinci_ids[i].type;
break;
}
}
@@ -84,10 +106,11 @@ void __init davinci_check_revision(void)
for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
if (part_no == davinci_ids[i].part_no &&
variant == davinci_ids[i].variant) {
- system_rev = davinci_ids[i].type;
+ davinci_revision = davinci_ids[i].type;
break;
}
}
- printk("DaVinci DM%04x variant 0x%x\n", system_rev >> 16, variant);
+ printk(KERN_INFO "DaVinci DM%04x variant 0x%x\n",
+ davinci_rev(), variant);
}
diff --git a/arch/arm/mach-davinci/include/mach/cputype.h b/arch/arm/mach-davinci/include/mach/cputype.h
new file mode 100644
index 0000000..27cfb1b
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/cputype.h
@@ -0,0 +1,49 @@
+/*
+ * DaVinci CPU type detection
+ *
+ * Author: Kevin Hilman, Deep Root Systems, LLC
+ *
+ * Defines the cpu_is_*() macros for runtime detection of DaVinci
+ * device type. In addtion, if support for a given device is not
+ * compiled in to the kernel, the macros return 0 so that
+ * resulting code can be optimized out.
+ *
+ * 2009 (c) Deep Root Systems, LLC. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#ifndef _ASM_ARCH_CPU_H
+#define _ASM_ARCH_CPU_H
+
+extern unsigned int davinci_rev(void);
+
+#define IS_DAVINCI_CPU(type, id) \
+static inline int is_davinci_dm ##type(void) \
+{ \
+ return (davinci_rev() == (id)) ? 1 : 0; \
+}
+
+IS_DAVINCI_CPU(644x, 0x6446)
+IS_DAVINCI_CPU(646x, 0x6467)
+IS_DAVINCI_CPU(355, 0x355)
+
+#ifdef CONFIG_ARCH_DAVINCI_DM644x
+#define cpu_is_davinci_dm644x() is_davinci_dm644x()
+#else
+#define cpu_is_davinci_dm644x() 0
+#endif
+
+#ifdef CONFIG_ARCH_DAVINCI_DM646x
+#define cpu_is_davinci_dm646x() is_davinci_dm646x()
+#else
+#define cpu_is_davinci_dm646x() 0
+#endif
+
+#ifdef CONFIG_ARCH_DAVINCI_DM355
+#define cpu_is_davinci_dm355() is_davinci_dm355()
+#else
+#define cpu_is_davinci_dm355() 0
+#endif
+
+#endif