u-boot/arch/arm/include/asm/global_data.h
Paul Kocialkowski 60c7c30aa0 omap-common: Common boot code OMAP3 support and cleanup
This introduces OMAP3 support for the common omap boot code, as well as a
major cleanup of the common omap boot code.

First, the omap_boot_parameters structure becomes platform-specific, since its
definition differs a bit across omap platforms. The offsets are removed as well
since it is U-Boot's coding style to use structures for mapping such kind of
data (in the sense that it is similar to registers). It is correct to assume
that romcode structure encoding is the same as U-Boot, given the description
of these structures in the TRMs.

The original address provided by the bootrom is passed to the U-Boot binary
instead of a duplicate of the structure stored in global data. This allows to
have only the relevant (boot device and mode) information stored in global data.
It is also expected that the address where the bootrom stores that information
is not overridden by the U-Boot SPL or U-Boot.

The save_omap_boot_params is expected to handle all special cases where the data
provided by the bootrom cannot be used as-is, so that spl_boot_device and
spl_boot_mode only return the data from global data.

All of this is only relevant when the U-Boot SPL is used. In cases it is not,
save_boot_params should fallback to its weak (or board-specific) definition.
save_omap_boot_params should not be called in that context either.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
2015-07-27 15:02:03 -04:00

87 lines
1.8 KiB
C

/*
* (C) Copyright 2002-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_GBL_DATA_H
#define __ASM_GBL_DATA_H
/* Architecture-specific global data */
struct arch_global_data {
#if defined(CONFIG_FSL_ESDHC)
u32 sdhc_clk;
#endif
#if defined(CONFIG_U_QE)
u32 qe_clk;
u32 brg_clk;
uint mp_alloc_base;
uint mp_alloc_top;
#endif /* CONFIG_U_QE */
#ifdef CONFIG_AT91FAMILY
/* "static data" needed by at91's clock.c */
unsigned long cpu_clk_rate_hz;
unsigned long main_clk_rate_hz;
unsigned long mck_rate_hz;
unsigned long plla_rate_hz;
unsigned long pllb_rate_hz;
unsigned long at91_pllb_usb_init;
#endif
/* "static data" needed by most of timer.c on ARM platforms */
unsigned long timer_rate_hz;
unsigned long tbu;
unsigned long tbl;
unsigned long lastinc;
unsigned long long timer_reset_value;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
unsigned long tlb_size;
#endif
#ifdef CONFIG_OMAP_COMMON
u32 omap_boot_device;
u32 omap_boot_mode;
u8 omap_ch_flags;
#endif
#ifdef CONFIG_FSL_LSCH3
unsigned long mem2_clk;
#endif
};
#include <asm-generic/global_data.h>
#ifdef __clang__
#define DECLARE_GLOBAL_DATA_PTR
#define gd get_gd()
static inline gd_t *get_gd(void)
{
gd_t *gd_ptr;
#ifdef CONFIG_ARM64
/*
* Make will already error that reserving x18 is not supported at the
* time of writing, clang: error: unknown argument: '-ffixed-x18'
*/
__asm__ volatile("mov %0, x18\n" : "=r" (gd_ptr));
#else
__asm__ volatile("mov %0, r9\n" : "=r" (gd_ptr));
#endif
return gd_ptr;
}
#else
#ifdef CONFIG_ARM64
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("x18")
#else
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
#endif
#endif
#endif /* __ASM_GBL_DATA_H */