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[ARM] 4343/1: iop13xx: automatically detect the internal bus frequency

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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Dan Williams 2007-04-29 09:32:51 +01:00 committed by Russell King
parent 7dcad376e8
commit 84c981ffb3
4 changed files with 63 additions and 2 deletions
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4
arch/arm/mach-iop13xx/iq81340mc.c
View file

@ -79,7 +79,9 @@ static void __init iq81340mc_init(void)
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 = {

4
arch/arm/mach-iop13xx/iq81340sc.c
View file

@ -81,7 +81,9 @@ static void __init iq81340sc_init(void)
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 = {

1
include/asm-arm/arch-iop13xx/iop13xx.h
View file

@ -455,4 +455,5 @@ static inline int iop13xx_cpu_id(void)
#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_ */

56
include/asm-arm/arch-iop13xx/time.h
View file

@ -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));