[AVR32] Clean up cpu identification and add features bitmap

Clean up the cpu identification code, using definitions from
<asm/sysreg.h> instead of hardcoded constants. Also, add a features
bitmap to struct avr32_cpuinfo to allow other code to make decisions
based upon what the running cpu is actually capable of.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

2 files changed, 53 insertions, 20 deletions

diff --git a/arch/avr32/kernel/cpu.c b/arch/avr32/kernel/cpu.c
index 2e72fd2699df..2714cf6452b5 100644
--- a/arch/avr32/kernel/cpu.c
+++ b/arch/avr32/kernel/cpu.c
@@ -209,16 +209,17 @@ static const char *mmu_types[] = {
 void __init setup_processor(void)
 {
         unsigned long config0, config1;
+        unsigned long features;
         unsigned cpu_id, cpu_rev, arch_id, arch_rev, mmu_type;
         unsigned tmp;
 
-        config0 = sysreg_read(CONFIG0); /* 0x0000013e; */
-        config1 = sysreg_read(CONFIG1); /* 0x01f689a2; */
-        cpu_id = config0 >> 24;
-        cpu_rev = (config0 >> 16) & 0xff;
-        arch_id = (config0 >> 13) & 0x07;
-        arch_rev = (config0 >> 10) & 0x07;
-        mmu_type = (config0 >> 7) & 0x03;
+        config0 = sysreg_read(CONFIG0);
+        config1 = sysreg_read(CONFIG1);
+        cpu_id = SYSREG_BFEXT(PROCESSORID, config0);
+        cpu_rev = SYSREG_BFEXT(PROCESSORREVISION, config0);
+        arch_id = SYSREG_BFEXT(AT, config0);
+        arch_rev = SYSREG_BFEXT(AR, config0);
+        mmu_type = SYSREG_BFEXT(MMUT, config0);
 
         boot_cpu_data.arch_type = arch_id;
         boot_cpu_data.cpu_type = cpu_id;
@@ -226,16 +227,16 @@ void __init setup_processor(void)
         boot_cpu_data.cpu_revision = cpu_rev;
         boot_cpu_data.tlb_config = mmu_type;
 
-        tmp = (config1 >> 13) & 0x07;
+        tmp = SYSREG_BFEXT(ILSZ, config1);
         if (tmp) {
-                boot_cpu_data.icache.ways = 1 << ((config1 >> 10) & 0x07);
-                boot_cpu_data.icache.sets = 1 << ((config1 >> 16) & 0x0f);
+                boot_cpu_data.icache.ways = 1 << SYSREG_BFEXT(IASS, config1);
+                boot_cpu_data.icache.sets = 1 << SYSREG_BFEXT(ISET, config1);
                 boot_cpu_data.icache.linesz = 1 << (tmp + 1);
         }
-        tmp = (config1 >> 3) & 0x07;
+        tmp = SYSREG_BFEXT(DLSZ, config1);
         if (tmp) {
-                boot_cpu_data.dcache.ways = 1 << (config1 & 0x07);
-                boot_cpu_data.dcache.sets = 1 << ((config1 >> 6) & 0x0f);
+                boot_cpu_data.dcache.ways = 1 << SYSREG_BFEXT(DASS, config1);
+                boot_cpu_data.dcache.sets = 1 << SYSREG_BFEXT(DSET, config1);
                 boot_cpu_data.dcache.linesz = 1 << (tmp + 1);
         }
 
@@ -250,16 +251,39 @@ void __init setup_processor(void)
                 cpu_names[cpu_id], cpu_id, cpu_rev,
                 arch_names[arch_id], arch_rev);
         printk ("CPU: MMU configuration: %s\n", mmu_types[mmu_type]);
+
         printk ("CPU: features:");
-        if (config0 & (1 << 6))
-                printk(" fpu");
-        if (config0 & (1 << 5))
-                printk(" java");
-        if (config0 & (1 << 4))
-                printk(" perfctr");
-        if (config0 & (1 << 3))
+        features = 0;
+        if (config0 & SYSREG_BIT(CONFIG0_R)) {
+                features |= AVR32_FEATURE_RMW;
+                printk(" rmw");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_D)) {
+                features |= AVR32_FEATURE_DSP;
+                printk(" dsp");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_S)) {
+                features |= AVR32_FEATURE_SIMD;
+                printk(" simd");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_O)) {
+                features |= AVR32_FEATURE_OCD;
                 printk(" ocd");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_P)) {
+                features |= AVR32_FEATURE_PCTR;
+                printk(" perfctr");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_J)) {
+                features |= AVR32_FEATURE_JAVA;
+                printk(" java");
+        }
+        if (config0 & SYSREG_BIT(CONFIG0_F)) {
+                features |= AVR32_FEATURE_FPU;
+                printk(" fpu");
+        }
         printk("\n");
+        boot_cpu_data.features = features;
 }
 
 #ifdef CONFIG_PROC_FS
diff --git a/include/asm-avr32/processor.h b/include/asm-avr32/processor.h
index f6913778a45f..cbb89ccd3f05 100644
--- a/include/asm-avr32/processor.h
+++ b/include/asm-avr32/processor.h
@@ -40,6 +40,14 @@ enum tlb_config {
         TLB_INVALID
 };
 
+#define AVR32_FEATURE_RMW       (1 << 0)
+#define AVR32_FEATURE_DSP       (1 << 1)
+#define AVR32_FEATURE_SIMD      (1 << 2)
+#define AVR32_FEATURE_OCD       (1 << 3)
+#define AVR32_FEATURE_PCTR      (1 << 4)
+#define AVR32_FEATURE_JAVA      (1 << 5)
+#define AVR32_FEATURE_FPU       (1 << 6)
+
 struct avr32_cpuinfo {
         struct clk *clk;
         unsigned long loops_per_jiffy;
@@ -48,6 +56,7 @@ struct avr32_cpuinfo {
         unsigned short arch_revision;
         unsigned short cpu_revision;
         enum tlb_config tlb_config;
+        unsigned long features;
 
         struct cache_info icache;
         struct cache_info dcache;