From 96583cdc2d217686fb2c9e345f0bbaa9c9ea2c49 Mon Sep 17 00:00:00 2001 From: Patrick Delaunay Date: Mon, 19 Mar 2018 19:09:21 +0100 Subject: [PATCH] stm32mp: add check of cpu identifier Add support of DBGMCU_IDC for cpu identifier and revision Signed-off-by: Patrick Delaunay --- arch/arm/mach-stm32mp/cpu.c | 48 +++++++++++++++++++++++++- arch/arm/mach-stm32mp/include/mach/sys_proto.h | 16 +++++++++ 2 files changed, 63 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-stm32mp/include/mach/sys_proto.h diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c index 34f4d60..3e5ac15 100644 --- a/arch/arm/mach-stm32mp/cpu.c +++ b/arch/arm/mach-stm32mp/cpu.c @@ -7,6 +7,7 @@ #include #include #include +#include /* 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 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); -- 2.7.4