From: "tpearson@raptorengineering.com" tpearson@raptorengineering.com
According to the user manuals released by Allwinner, the low 8-bit of the 0x24 register in "System Control" (marked SRAMC in U-Boot source as it controls some SRAMs' functionality since A10) is the silicon revision of the chip.
This data is now important for A83T: according to the BSP source A83T have two revisions: Revision A (with revision ID 0) and Revision B (with revision ID 1); and revision B requires a SMP bringup workaround.
Print the revision number when the SoC is A83T, as it does matter there.
Signed-off-by: Timothy Pearson tpearson@raptorengineering.com [Icenowy: convert to macro so that it can be reused in PSCI code] Signed-off-by: Icenowy Zheng icenowy@aosc.io --- arch/arm/include/asm/arch-sunxi/cpu_sun4i.h | 7 +++++++ arch/arm/mach-sunxi/cpu_info.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h index 6aa5e91ada..a96680d8e8 100644 --- a/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h +++ b/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h @@ -205,6 +205,13 @@ void sunxi_board_init(void); void sunxi_reset(void); int sunxi_get_ss_bonding_id(void); int sunxi_get_sid(unsigned int *sid); + +/* + * Implement it as a macro, because it's used both in PSCI source code + * and normal U-Boot source code. + */ +#define sunxi_get_revision() (readl(SUNXI_SRAMC_BASE + 0x24) & 0xff) + #endif /* __ASSEMBLY__ */
#endif /* _SUNXI_CPU_SUN4I_H */ diff --git a/arch/arm/mach-sunxi/cpu_info.c b/arch/arm/mach-sunxi/cpu_info.c index 25a5ec26a0..4236ab8f11 100644 --- a/arch/arm/mach-sunxi/cpu_info.c +++ b/arch/arm/mach-sunxi/cpu_info.c @@ -84,7 +84,7 @@ int print_cpuinfo(void) #elif defined CONFIG_MACH_SUN8I_A33 printf("CPU: Allwinner A33 (SUN8I %04x)\n", sunxi_get_sram_id()); #elif defined CONFIG_MACH_SUN8I_A83T - printf("CPU: Allwinner A83T (SUN8I %04x)\n", sunxi_get_sram_id()); + printf("CPU: Allwinner A83T (SUN8I %04x rev. %x)\n", sunxi_get_sram_id(), sunxi_get_revision()); #elif defined CONFIG_MACH_SUN8I_H3 printf("CPU: Allwinner H3 (SUN8I %04x)\n", sunxi_get_sram_id()); #elif defined CONFIG_MACH_SUN8I_R40