stm32mp: add check of cpu identifier

Add support of DBGMCU_IDC for cpu identifier
and revision

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c
index 34f4d60..3e5ac15 100644 (file)
--- a/arch/arm/mach-stm32mp/cpu.c
+++ b/arch/arm/mach-stm32mp/cpu.c
@@ -7,6 +7,7 @@
 #include <clk.h>
 #include <asm/io.h>
 #include <asm/arch/stm32.h>
+#include <asm/arch/sys_proto.h>
 
 /* RCC register */
 #define RCC_TZCR               (STM32_RCC_BASE + 0x00)
@@ -31,8 +32,13 @@
 #define PWR_CR1_DBP            BIT(8)
 
 /* DBGMCU register */
+#define DBGMCU_IDC             (STM32_DBGMCU_BASE + 0x00)
 #define DBGMCU_APB4FZ1         (STM32_DBGMCU_BASE + 0x2C)
 #define DBGMCU_APB4FZ1_IWDG2   BIT(2)
+#define DBGMCU_IDC_DEV_ID_MASK GENMASK(11, 0)
+#define DBGMCU_IDC_DEV_ID_SHIFT        0
+#define DBGMCU_IDC_REV_ID_MASK GENMASK(31, 16)
+#define DBGMCU_IDC_REV_ID_SHIFT        16
 
 #if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD)
 static void security_init(void)
@@ -123,10 +129,50 @@ void enable_caches(void)
        dcache_enable();
 }
 
+static u32 read_idc(void)
+{
+       setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN);
+
+       return readl(DBGMCU_IDC);
+}
+
+u32 get_cpu_rev(void)
+{
+       return (read_idc() & DBGMCU_IDC_REV_ID_MASK) >> DBGMCU_IDC_REV_ID_SHIFT;
+}
+
+u32 get_cpu_type(void)
+{
+       return (read_idc() & DBGMCU_IDC_DEV_ID_MASK) >> DBGMCU_IDC_DEV_ID_SHIFT;
+}
+
 #if defined(CONFIG_DISPLAY_CPUINFO)
 int print_cpuinfo(void)
 {
-       printf("CPU: STM32MP15x\n");
+       char *cpu_s, *cpu_r;
+
+       switch (get_cpu_type()) {
+       case CPU_STMP32MP15x:
+               cpu_s = "15x";
+               break;
+       default:
+               cpu_s = "?";
+               break;
+       }
+
+       switch (get_cpu_rev()) {
+       case CPU_REVA:
+               cpu_r = "A";
+               break;
+       case CPU_REVB:
+               cpu_r = "B";
+               break;
+       default:
+               cpu_r = "?";
+               break;
+       }
+
+       printf("CPU: STM32MP%s.%s\n", cpu_s, cpu_r);
 
        return 0;
 }

diff --git a/arch/arm/mach-stm32mp/include/mach/sys_proto.h b/arch/arm/mach-stm32mp/include/mach/sys_proto.h
new file mode 100644 (file)
index 0000000..a8c20d1
--- /dev/null
+++ b/arch/arm/mach-stm32mp/include/mach/sys_proto.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2015-2017, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:    GPL-2.0+        BSD-3-Clause
+ */
+
+#define CPU_STMP32MP15x        0x500
+
+/* return CPU_STMP32MPxx constants */
+u32 get_cpu_type(void);
+
+#define CPU_REVA       0x1000
+#define CPU_REVB       0x2000
+
+/* return CPU_REV constants */
+u32 get_cpu_rev(void);