From 363d1d8f9c99b63daef81f5985cab3fc00edde5c Mon Sep 17 00:00:00 2001 From: Bartlomiej Sieka Date: Tue, 23 Jan 2007 13:25:22 +0100 Subject: [ColdFire MCF5271 family] Add CPU detection based on the value of Chip Identification Register (CIR). --- cpu/mcf52x2/cpu.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'cpu/mcf52x2/cpu.c') diff --git a/cpu/mcf52x2/cpu.c b/cpu/mcf52x2/cpu.c index aa6b2bd670..ce59d39cfa 100644 --- a/cpu/mcf52x2/cpu.c +++ b/cpu/mcf52x2/cpu.c @@ -49,11 +49,43 @@ #endif #ifdef CONFIG_M5271 +/* + * Both MCF5270 and MCF5271 are members of the MPC5271 family. Try to + * determine which one we are running on, based on the Chip Identification + * Register (CIR). + */ int checkcpu (void) { char buf[32]; + unsigned short cir; /* Chip Identification Register */ + unsigned short pin; /* Part identification number */ + unsigned char prn; /* Part revision number */ + char *cpu_model; + + cir = mbar_readShort(MCF_CCM_CIR); + pin = cir >> MCF_CCM_CIR_PIN_LEN; + prn = cir & MCF_CCM_CIR_PRN_MASK; + + switch (pin) { + case MCF_CCM_CIR_PIN_MCF5270: + cpu_model = "5270"; + break; + case MCF_CCM_CIR_PIN_MCF5271: + cpu_model = "5271"; + break; + default: + cpu_model = NULL; + break; + } + + if (cpu_model) + printf("CPU: Freescale ColdFire MCF%s rev. %hu, at %s MHz\n", + cpu_model, prn, strmhz(buf, CFG_CLK)); + else + printf("CPU: Unknown - Freescale ColdFire MCF5271 family" + " (PIN: 0x%x) rev. %hu, at %s MHz\n", + pin, prn, strmhz(buf, CFG_CLK)); - printf ("CPU: Freescale Coldfire MCF5271 at %s MHz\n", strmhz(buf, CFG_CLK)); return 0; } -- cgit v1.2.1