diff options
| -rw-r--r-- | payloads/libpayload/arch/mips/timer.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/payloads/libpayload/arch/mips/timer.c b/payloads/libpayload/arch/mips/timer.c index 1710a322e2..782959b71a 100644 --- a/payloads/libpayload/arch/mips/timer.c +++ b/payloads/libpayload/arch/mips/timer.c @@ -19,6 +19,10 @@ #include <libpayload.h> #include <arch/cpu.h> +#include <arch/io.h> + +#define PISTACHIO_CLOCK_SWITCH 0xB8144200 +#define MIPS_EXTERN_PLL_BYPASS_MASK 0x00000002 /** * @ingroup arch @@ -34,10 +38,19 @@ u32 cpu_khz; unsigned int get_cpu_speed(void) { if (IMG_PLATFORM_ID() != IMG_PLATFORM_ID_SILICON) - cpu_khz = 50000U; /* FPGA board */ - /* else { - * TODO find CPU frequency on the real SOC - } */ + cpu_khz = 50000; /* FPGA board */ + else { + /* If MIPS PLL external bypass bit is set, it means + * that the MIPS PLL is already set up to work at a + * frequency of 550 MHz; otherwise, the crystal is + * used with a frequency of 52 MHz + */ + if (read32(PISTACHIO_CLOCK_SWITCH) & + MIPS_EXTERN_PLL_BYPASS_MASK) + cpu_khz = 550000; + else + cpu_khz = 52000; + } return cpu_khz; } |