From e46fedfeb214d118b9983d11fcc929ed49f5ccd7 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Thu, 4 Aug 2011 18:03:41 -0500 Subject: powerpc/85xx: introduce and document CONFIG_SYS_CCSRBAR macros Introduce the CONFIG_SYS_CCSRBAR_PHYS_HIGH and CONFIG_SYS_CCSRBAR_PHYS_LOW macros, which contain the high and low portions of CONFIG_SYS_CCSRBAR_PHYS. This is necessary for the assembly-language code that relocates CCSR, since the assembler does not understand 64-bit constants. CONFIG_SYS_CCSRBAR_PHYS is automatically defined from the CONFIG_SYS_CCSRBAR_PHYS_HIGH and CONFIG_SYS_CCSRBAR_PHYS_LOW macros, so it should not be defined in a board header file. Similarly, CONFIG_SYS_CCSRBAR_DEFAULT is defined for each SOC in config_mpc85xx.h, so it should also not be defined in the board header file. CONFIG_SYS_CCSR_DO_NOT_RELOCATE is a "short-cut" macro that guarantees that CONFIG_SYS_CCSRBAR_PHYS is set to the same value as CONFIG_SYS_CCSRBAR_DEFAULT, and so CCSR will not be relocated. Since CONFIG_SYS_CCSRBAR_DEFAULT is locked to a fixed value, multi-stage U-Boot builds (e.g. NAND) are required to relocate CCSR only during the last stage (i.e. the "real" U-Boot). All other stages should define CONFIG_SYS_CCSR_DO_NOT_RELOCATE to ensure that CCSR is not relocated. README is updated with descriptions of all the CONFIG_SYS_CCSRBAR_xxx macros. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- include/mpc85xx.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'include/mpc85xx.h') diff --git a/include/mpc85xx.h b/include/mpc85xx.h index 2495b99c310..11d898527bf 100644 --- a/include/mpc85xx.h +++ b/include/mpc85xx.h @@ -26,4 +26,46 @@ #define SCCR_DFBRG10 0x00000002 /* BRGCLK division by 64 */ #define SCCR_DFBRG11 0x00000003 /* BRGCLK division by 256 */ +/* + * Define default values for some CCSR macros to make header files cleaner* + * + * To completely disable CCSR relocation in a board header file, define + * CONFIG_SYS_CCSR_DO_NOT_RELOCATE. This will force CONFIG_SYS_CCSRBAR_PHYS + * to a value that is the same as CONFIG_SYS_CCSRBAR. + */ + +#ifdef CONFIG_SYS_CCSRBAR_PHYS +#error "Do not define CONFIG_SYS_CCSRBAR_PHYS directly. Use \ +CONFIG_SYS_CCSRBAR_PHYS_LOW and/or CONFIG_SYS_CCSRBAR_PHYS_HIGH instead." +#endif + +#ifdef CONFIG_SYS_CCSR_DO_NOT_RELOCATE +#undef CONFIG_SYS_CCSRBAR_PHYS_HIGH +#undef CONFIG_SYS_CCSRBAR_PHYS_LOW +#define CONFIG_SYS_CCSRBAR_PHYS_HIGH 0 +#endif + +#ifndef CONFIG_SYS_CCSRBAR +#define CONFIG_SYS_CCSRBAR CONFIG_SYS_CCSRBAR_DEFAULT +#endif + +#ifndef CONFIG_SYS_CCSRBAR_PHYS_HIGH +#ifdef CONFIG_PHYS_64BIT +#define CONFIG_SYS_CCSRBAR_PHYS_HIGH 0xf +#else +#define CONFIG_SYS_CCSRBAR_PHYS_HIGH 0 +#endif +#endif + +#ifndef CONFIG_SYS_CCSRBAR_PHYS_LOW +#define CONFIG_SYS_CCSRBAR_PHYS_LOW CONFIG_SYS_CCSRBAR_DEFAULT +#endif + +#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH * 1ull) << 32 | \ + CONFIG_SYS_CCSRBAR_PHYS_LOW) + +#ifndef CONFIG_SYS_IMMR +#define CONFIG_SYS_IMMR CONFIG_SYS_CCSRBAR +#endif + #endif /* __MPC85xx_H__ */ -- cgit v1.2.3