The ColdFire 527x family of SoCs (including 5271 and 5275) have a Chip
Identification Register (CIR) that can be used to determine the exact
SoC family member. Read this at startup to report the exact SoC type
and its revision number.
Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
---
arch/m68k/coldfire/m527x.c | 22 ++++++++++++++++++++++
arch/m68k/include/asm/m527xsim.h | 10 ++++++++++
2 files changed, 32 insertions(+)
diff --git a/arch/m68k/coldfire/m527x.c b/arch/m68k/coldfire/m527x.c
index 037f3e520acc..8f9cda3d4dba 100644
--- a/arch/m68k/coldfire/m527x.c
+++ b/arch/m68k/coldfire/m527x.c
@@ -23,6 +23,7 @@
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
#include <asm/mcfclk.h>
+#include <asm/setup.h>
/***************************************************************************/
@@ -133,13 +134,34 @@ static void __init m527x_fec_init(void)
/***************************************************************************/
+static void __init m527x_probe_cpu(void)
+{
+ u16 v;
+
+ v = readw(MCF_CIR);
+
+ switch (MCFCIR_PIN(v)) {
+ case MCFCIR_5275:
+ m68k_cpuname = "5275";
+ break;
+ case MCFCIR_5271:
+ m68k_cpuname = "5271";
+ break;
+ }
+
+ m68k_cpurevision = MCFCIR_PRN(v);
+}
+
void __init config_BSP(char *commandp, int size)
{
mach_sched_init = hw_timer_init;
+
+ m527x_probe_cpu();
m527x_uarts_init();
m527x_fec_init();
m527x_qspi_init();
m527x_i2c_init();
+
clkdev_add_table(m527x_clk_lookup, ARRAY_SIZE(m527x_clk_lookup));
}
diff --git a/arch/m68k/include/asm/m527xsim.h b/arch/m68k/include/asm/m527xsim.h
index 2a517b31e728..900470b1996d 100644
--- a/arch/m68k/include/asm/m527xsim.h
+++ b/arch/m68k/include/asm/m527xsim.h
@@ -362,5 +362,15 @@
#define MCFI2C_BASE0 (MCF_IPSBAR + 0x300)
#define MCFI2C_SIZE0 0x40
+/*
+ * Chip Identification.
+ */
+#define MCF_CIR (MCF_IPSBAR + 0x11000A)
+#define MCFCIR_PRN(x) ((x) & 0x3f) /* Chip revision */
+#define MCFCIR_PIN(x) ((x) >> 6) /* Chip ID */
+
+#define MCFCIR_5271 0x32
+#define MCFCIR_5275 0x3b
+
/****************************************************************************/
#endif /* m527xsim_h */
--
2.25.1
