[U-Boot] [PATCH v3 3/7] ARM: vf610: Add SoC and CPU type detection

Sanchayan Maity
2015-04-15T10:54:24Z

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>
---
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