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https://github.com/brain-hackers/u-boot-brain
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omap4: utility function to identify the context of hw init
The basic hardware init of OMAP4(s_init()) can happen in 4 different contexts: 1. SPL running from SRAM 2. U-Boot running from FLASH 3. Non-XIP U-Boot loaded to SDRAM by SPL 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the Configuration Header feature What level of hw initialization gets done depends on this context. Add a utility function to find this context. Signed-off-by: Aneesh V <aneesh@ti.com> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
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@ -23,10 +23,12 @@
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#include <asm/arch/omap4.h>
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#include <asm/arch/omap4.h>
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#include <asm/io.h>
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#include <asm/io.h>
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#include <asm/omap_common.h>
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struct omap_sysinfo {
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struct omap_sysinfo {
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char *board_string;
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char *board_string;
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};
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};
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extern const struct omap_sysinfo sysinfo;
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void gpmc_init(void);
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void gpmc_init(void);
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void watchdog_init(void);
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void watchdog_init(void);
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@ -37,6 +39,51 @@ u32 wait_on_value(u32, u32, void *, u32);
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void sdelay(unsigned long);
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void sdelay(unsigned long);
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void set_pl310_ctrl_reg(u32 val);
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void set_pl310_ctrl_reg(u32 val);
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extern const struct omap_sysinfo sysinfo;
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static inline u32 running_from_sdram(void)
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{
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u32 pc;
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asm volatile ("mov %0, pc" : "=r" (pc));
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return ((pc >= OMAP44XX_DRAM_ADDR_SPACE_START) &&
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(pc < OMAP44XX_DRAM_ADDR_SPACE_END));
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}
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static inline u8 uboot_loaded_by_spl(void)
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{
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/*
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* Configuration Header is not supported yet, so u-boot init running
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* from SDRAM implies that it was loaded by SPL. When this situation
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* changes one of these approaches could be taken:
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* i. Pass a magic from SPL to U-Boot and U-Boot save it at a known
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* location.
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* ii. Check the OPP. CH can support only 50% OPP while SPL initializes
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* the DPLLs at 100% OPP.
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*/
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return running_from_sdram();
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}
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/*
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* The basic hardware init of OMAP(s_init()) can happen in 4
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* different contexts:
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* 1. SPL running from SRAM
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* 2. U-Boot running from FLASH
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* 3. Non-XIP U-Boot loaded to SDRAM by SPL
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* 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
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* Configuration Header feature
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*
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* This function finds this context.
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* Defining as inline may help in compiling out unused functions in SPL
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*/
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static inline u32 omap4_hw_init_context(void)
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{
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#ifdef CONFIG_SPL_BUILD
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return OMAP_INIT_CONTEXT_SPL;
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#else
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if (uboot_loaded_by_spl())
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return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
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else if (running_from_sdram())
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return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
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else
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return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
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#endif
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}
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#endif
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#endif
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34
arch/arm/include/asm/omap_common.h
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34
arch/arm/include/asm/omap_common.h
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@ -0,0 +1,34 @@
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/*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Aneesh V <aneesh@ti.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _OMAP_COMMON_H_
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#define _OMAP_COMMON_H_
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/* HW Init Context */
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#define OMAP_INIT_CONTEXT_SPL 0
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#define OMAP_INIT_CONTEXT_UBOOT_FROM_NOR 1
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#define OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL 2
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#define OMAP_INIT_CONTEXT_UBOOT_AFTER_CH 3
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#endif /* _OMAP_COMMON_H_ */
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