ARM: vf610: Add SoC and CPU type detection

Vybrid product family consists of several rather similar SoC which
can be determined by softare during boot time. This allows use of
variable ${soc} for Linux device tree files. Detect VF5xx CPU's by
reading the CPU count register. We can determine the second number
of the CPU type (VF6x0) which indicates the presence of a L2 cache.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

2 files changed, 39 insertions, 2 deletions

diff --git a/arch/arm/cpu/armv7/vf610/generic.c b/arch/arm/cpu/armv7/vf610/generic.c
index 92aaad9..3bdc221 100644
--- a/arch/arm/cpu/armv7/vf610/generic.c
+++ b/arch/arm/cpu/armv7/vf610/generic.c
@@ -18,6 +18,8 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
+static char soc_type[] = "xx0";
+
 #ifdef CONFIG_MXC_OCOTP
 void enable_ocotp_clk(unsigned char enable)
 {
@@ -284,14 +286,37 @@ static char *get_reset_cause(void)
 
 int print_cpuinfo(void)
 {
-	printf("CPU:   Freescale Vybrid VF610 at %d MHz\n",
-		mxc_get_clock(MXC_ARM_CLK) / 1000000);
+	printf("CPU: Freescale Vybrid VF%s at %d MHz\n",
+	       soc_type, mxc_get_clock(MXC_ARM_CLK) / 1000000);
 	printf("Reset cause: %s\n", get_reset_cause());
 
 	return 0;
 }
 #endif
 
+int arch_cpu_init(void)
+{
+	struct mscm *mscm = (struct mscm *)MSCM_BASE_ADDR;
+
+	soc_type[0] = mscm->cpxcount ? '6' : '5'; /*Dual Core => VF6x0 */
+	soc_type[1] = mscm->cpxcfg1 ? '1' : '0'; /* L2 Cache => VFx10 */
+
+	return 0;
+}
+
+#ifdef CONFIG_ARCH_MISC_INIT
+int arch_misc_init(void)
+{
+	char soc[6];
+
+	strcat(soc, "vf");
+	strcat(soc, soc_type);
+	setenv("soc", soc);
+
+	return 0;
+}
+#endif
+
 int cpu_eth_init(bd_t *bis)
 {
 	int rc = -ENODEV;
diff --git a/arch/arm/include/asm/arch-vf610/imx-regs.h b/arch/arm/include/asm/arch-vf610/imx-regs.h
index aa60031..a5908ca 100644
--- a/arch/arm/include/asm/arch-vf610/imx-regs.h
+++ b/arch/arm/include/asm/arch-vf610/imx-regs.h
@@ -457,6 +457,18 @@ struct scsc_reg {
 	u32 sosc_ctr;
 };
 
+/* MSCM */
+struct mscm {
+	u32 cpxtype;
+	u32 cpxnum;
+	u32 cpxmaster;
+	u32 cpxcount;
+	u32 cpxcfg0;
+	u32 cpxcfg1;
+	u32 cpxcfg2;
+	u32 cpxcfg3;
+};
+
 #endif	/* __ASSEMBLER__*/
 
 #endif	/* __ASM_ARCH_IMX_REGS_H__ */