[ARM] 4343/1: iop13xx: automatically detect the internal bus frequency
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-iop13xx/iq81340mc.c b/arch/arm/mach-iop13xx/iq81340mc.c
index a519d707..1ae08cc 100644
--- a/arch/arm/mach-iop13xx/iq81340mc.c
+++ b/arch/arm/mach-iop13xx/iq81340mc.c
@@ -79,7 +79,9 @@
static void __init iq81340mc_timer_init(void)
{
- iop_init_time(400000000);
+ unsigned long bus_freq = iop13xx_core_freq() / iop13xx_xsi_bus_ratio();
+ printk(KERN_DEBUG "%s: bus frequency: %lu\n", __FUNCTION__, bus_freq);
+ iop_init_time(bus_freq);
}
static struct sys_timer iq81340mc_timer = {
diff --git a/arch/arm/mach-iop13xx/iq81340sc.c b/arch/arm/mach-iop13xx/iq81340sc.c
index 0e71fbc..0f88014 100644
--- a/arch/arm/mach-iop13xx/iq81340sc.c
+++ b/arch/arm/mach-iop13xx/iq81340sc.c
@@ -81,7 +81,9 @@
static void __init iq81340sc_timer_init(void)
{
- iop_init_time(400000000);
+ unsigned long bus_freq = iop13xx_core_freq() / iop13xx_xsi_bus_ratio();
+ printk(KERN_DEBUG "%s: bus frequency: %lu\n", __FUNCTION__, bus_freq);
+ iop_init_time(bus_freq);
}
static struct sys_timer iq81340sc_timer = {
diff --git a/include/asm-arm/arch-iop13xx/iop13xx.h b/include/asm-arm/arch-iop13xx/iop13xx.h
index 2d1e23b..c8762ae 100644
--- a/include/asm-arm/arch-iop13xx/iop13xx.h
+++ b/include/asm-arm/arch-iop13xx/iop13xx.h
@@ -455,4 +455,5 @@
#define IOP13XX_PBI_BAR1 IOP13XX_PBI_OFFSET(0x10)
#define IOP13XX_PBI_LR1 IOP13XX_PBI_OFFSET(0x14)
+#define IOP13XX_PROCESSOR_FREQ IOP13XX_REG_ADDR32(0x2180)
#endif /* _IOP13XX_HW_H_ */
diff --git a/include/asm-arm/arch-iop13xx/time.h b/include/asm-arm/arch-iop13xx/time.h
index 77a837a..49213d9 100644
--- a/include/asm-arm/arch-iop13xx/time.h
+++ b/include/asm-arm/arch-iop13xx/time.h
@@ -7,9 +7,65 @@
#define IOP_TMR_PRIVILEGED 0x08
#define IOP_TMR_RATIO_1_1 0x00
+#define IOP13XX_XSI_FREQ_RATIO_MASK (3 << 19)
+#define IOP13XX_XSI_FREQ_RATIO_2 (0 << 19)
+#define IOP13XX_XSI_FREQ_RATIO_3 (1 << 19)
+#define IOP13XX_XSI_FREQ_RATIO_4 (2 << 19)
+#define IOP13XX_CORE_FREQ_MASK (7 << 16)
+#define IOP13XX_CORE_FREQ_600 (0 << 16)
+#define IOP13XX_CORE_FREQ_667 (1 << 16)
+#define IOP13XX_CORE_FREQ_800 (2 << 16)
+#define IOP13XX_CORE_FREQ_933 (3 << 16)
+#define IOP13XX_CORE_FREQ_1000 (4 << 16)
+#define IOP13XX_CORE_FREQ_1200 (5 << 16)
+
void iop_init_time(unsigned long tickrate);
unsigned long iop_gettimeoffset(void);
+static inline unsigned long iop13xx_core_freq(void)
+{
+ unsigned long freq = __raw_readl(IOP13XX_PROCESSOR_FREQ);
+ freq &= IOP13XX_CORE_FREQ_MASK;
+ switch (freq) {
+ case IOP13XX_CORE_FREQ_600:
+ return 600000000;
+ case IOP13XX_CORE_FREQ_667:
+ return 667000000;
+ case IOP13XX_CORE_FREQ_800:
+ return 800000000;
+ case IOP13XX_CORE_FREQ_933:
+ return 933000000;
+ case IOP13XX_CORE_FREQ_1000:
+ return 1000000000;
+ case IOP13XX_CORE_FREQ_1200:
+ return 1200000000;
+ default:
+ printk("%s: warning unknown frequency, defaulting to 800Mhz\n",
+ __FUNCTION__);
+ }
+
+ return 800000000;
+}
+
+static inline unsigned long iop13xx_xsi_bus_ratio(void)
+{
+ unsigned long ratio = __raw_readl(IOP13XX_PROCESSOR_FREQ);
+ ratio &= IOP13XX_XSI_FREQ_RATIO_MASK;
+ switch (ratio) {
+ case IOP13XX_XSI_FREQ_RATIO_2:
+ return 2;
+ case IOP13XX_XSI_FREQ_RATIO_3:
+ return 3;
+ case IOP13XX_XSI_FREQ_RATIO_4:
+ return 4;
+ default:
+ printk("%s: warning unknown ratio, defaulting to 2\n",
+ __FUNCTION__);
+ }
+
+ return 2;
+}
+
static inline void write_tmr0(u32 val)
{
asm volatile("mcr p6, 0, %0, c0, c9, 0" : : "r" (val));
