Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-09-20 14:41:58 +00:00
Code Issues Projects Releases Packages Wiki Activity

arm: kirkwood: 88f6281: Detect CONFIG_SYS_TCLK from SAR register

Browse source 
Bit 21 in SAR register specifies if TCLK is running at 166 MHz or 200 MHz.
This information is undocumented in public Marvell Kirkwood Functional
Specifications [2], but is available in Linux v3.15 kirkwood code [1].

Commit 8ac303d49f ("arm: kirkwood: Do not overwrite CONFIG_SYS_TCLK")
broke support for Marvell 88F6281 SoCs because it was expected that all
those SoCs have TCLK running at 200 MHz as specified in Marvell 88F6281
Hardware Specifications [3].

Fix broken support for 88F6281 by detecting CONFIG_SYS_TCLK from SAR
register, like it was doing Linux v3.15.

[1] - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm/mach-kirkwood/common.c?h=v3.15#n542
[2] - https://web.archive.org/web/20130730091033/http://www.marvell.com/embedded-processors/kirkwood/assets/FS_88F6180_9x_6281_OpenSource.pdf
[3] - https://web.archive.org/web/20120620073511/http://www.marvell.com/embedded-processors/kirkwood/assets/HW_88F6281_OpenSource.pdf

Update by Stefan 2022-08-23:
- Fix compilation error for ds109

Fixes: 8ac303d49f ("arm: kirkwood: Do not overwrite CONFIG_SYS_TCLK")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2022-08-17 21:37:49 +02:00 committed by Stefan Roese
parent 616278bd2c
commit f395cf9cac
3 changed files with 5 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/arm/mach-kirkwood/include/mach/kw88f6281.h
View file

@ -15,6 +15,7 @@
#define KW_REGS_PHY_BASE KW88F6281_REGS_PHYS_BASE
/* TCLK Core Clock definition */
#define CONFIG_SYS_TCLK 200000000 /* 200MHz */
#define CONFIG_SYS_TCLK ((readl(CONFIG_SAR_REG) & BIT(21)) ? \
166666667 : 200000000)
#endif /* _ASM_ARCH_KW88F6281_H */

2
arch/arm/mach-kirkwood/include/mach/soc.h
View file

@ -62,6 +62,8 @@
#define MVCPU_WIN_ENABLE KWCPU_WIN_ENABLE
#define MVCPU_WIN_DISABLE KWCPU_WIN_DISABLE
#define CONFIG_SAR_REG (KW_MPP_BASE + 0x0030)
#if defined (CONFIG_KW88F6281)
#include <asm/arch/kw88f6281.h>
#elif defined (CONFIG_KW88F6192)

1
board/Synology/ds109/ds109.c
View file

@ -10,6 +10,7 @@
#include <miiphy.h>
#include <net.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>