u-boot/include/mpc85xx.h
Timur Tabi e46fedfeb2 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 <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-09-29 19:01:04 -05:00

71 lines
2 KiB
C

/*
* Copyright 2004, 2007 Freescale Semiconductor.
* Copyright(c) 2003 Motorola Inc.
*/
#ifndef __MPC85xx_H__
#define __MPC85xx_H__
/* define for common ppc_asm.tmpl */
#define EXC_OFF_SYS_RESET 0x100 /* System reset */
#define _START_OFFSET 0
#if defined(CONFIG_E500)
#include <e500.h>
#endif
/*
* SCCR - System Clock Control Register, 9-8
*/
#define SCCR_CLPD 0x00000004 /* CPM Low Power Disable */
#define SCCR_DFBRG_MSK 0x00000003 /* Division by BRGCLK Mask */
#define SCCR_DFBRG_SHIFT 0
#define SCCR_DFBRG00 0x00000000 /* BRGCLK division by 4 */
#define SCCR_DFBRG01 0x00000001 /* BRGCLK div by 16 (normal) */
#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__ */