[U-Boot] [PATCH v2 3/6] ARM: vf610: Add SoC and CPU type detection

[Sanchayan Maity]

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 <ste...@agner.ch>
Signed-off-by: Sanchayan Maity <maitysancha...@gmail.com>
---
 arch/arm/cpu/armv7/vf610/generic.c         | 29 +++++++++++++++++++++++++++--
 arch/arm/include/asm/arch-vf610/imx-regs.h | 12 ++++++++++++
 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__ */
-- 
2.3.5

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