[U-Boot] [PATCH v3] i.MX28: extend print_cpuinfo() to use chip information

[Otavio Salvador]

The information now is gathered from HW_DIGCTL_CHIPID register and
includes the chip modem and revision on the output.

Signed-off-by: Otavio Salvador <ota...@ossystems.com.br>
---
Changes in v2:
- use ?? for unidentified revision and cpu type
- use numeric revisions

Changes in v3:
- drop mx23 data as it will be posted in a later patch
- fix info order (first rev, then clock)

 arch/arm/cpu/arm926ejs/mx28/mx28.c           |   38 ++++++++++++++++++++++++--
 arch/arm/include/asm/arch-mx28/regs-digctl.h |    4 +++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c 
b/arch/arm/cpu/arm926ejs/mx28/mx28.c
index ff25772..cf7a50f 100644
--- a/arch/arm/cpu/arm926ejs/mx28/mx28.c
+++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c
@@ -188,13 +188,47 @@ int arch_cpu_init(void)
 }
 
 #if defined(CONFIG_DISPLAY_CPUINFO)
+static const char *get_cpu_type(void)
+{
+       struct mx28_digctl_regs *digctl_regs =
+               (struct mx28_digctl_regs *)MXS_DIGCTL_BASE;
+
+       switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
+       case HW_DIGCTL_CHIPID_MX28:
+               return "28";
+       default:
+               return "??";
+       }
+}
+
+static const char *get_cpu_rev(void)
+{
+       struct mx28_digctl_regs *digctl_regs =
+               (struct mx28_digctl_regs *)MXS_DIGCTL_BASE;
+       uint8_t rev = readl(&digctl_regs->hw_digctl_chipid) & 0x000000FF;
+
+       switch (readl(&digctl_regs->hw_digctl_chipid) & HW_DIGCTL_CHIPID_MASK) {
+       case HW_DIGCTL_CHIPID_MX28:
+               switch (rev) {
+               case 0x1:
+                       return "1.2";
+               default:
+                       return "??";
+               }
+       default:
+               return "??";
+       }
+}
+
 int print_cpuinfo(void)
 {
        struct mx28_spl_data *data = (struct mx28_spl_data *)
                ((CONFIG_SYS_TEXT_BASE - sizeof(struct mx28_spl_data)) & ~0xf);
 
-       printf("Freescale i.MX28 family at %d MHz\n",
-                       mxc_get_clock(MXC_ARM_CLK) / 1000000);
+       printf("CPU:   Freescale i.MX%s rev%s at %d MHz\n",
+               get_cpu_type(),
+               get_cpu_rev(),
+               mxc_get_clock(MXC_ARM_CLK) / 1000000);
        printf("BOOT:  %s\n", mx28_boot_modes[data->boot_mode_idx].mode);
        return 0;
 }
diff --git a/arch/arm/include/asm/arch-mx28/regs-digctl.h 
b/arch/arm/include/asm/arch-mx28/regs-digctl.h
index 9a63594..247da6e 100644
--- a/arch/arm/include/asm/arch-mx28/regs-digctl.h
+++ b/arch/arm/include/asm/arch-mx28/regs-digctl.h
@@ -152,4 +152,8 @@ struct mx28_digctl_regs {
 };
 #endif
 
+/* Product code identification */
+#define HW_DIGCTL_CHIPID_MASK  (0xffff << 16)
+#define HW_DIGCTL_CHIPID_MX28  (0x2800 << 16)
+
 #endif /* __MX28_REGS_DIGCTL_H__ */
-- 
1.7.10.4

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