arch/arm/include/asm/arch-omap5/sys_proto.h

   1 /*
   2  * (C) Copyright 2010
   3  * Texas Instruments, <www.ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  */
  20
  21 #ifndef _SYS_PROTO_H_
  22 #define _SYS_PROTO_H_
  23
  24 #include <asm/arch/omap.h>
  25 #include <asm/io.h>
  26 #include <asm/arch/clocks.h>
  27 #include <asm/omap_common.h>
  28 #include <asm/arch/mux_omap5.h>
  29 #include <asm/arch/clocks.h>
  30
  31 struct omap_sysinfo {
  32         char *board_string;
  33 };
  34 extern const struct omap_sysinfo sysinfo;
  35
  36 void gpmc_init(void);
  37 void watchdog_init(void);
  38 u32 get_device_type(void);
  39 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size);
  40 void set_muxconf_regs_essential(void);
  41 void set_muxconf_regs_non_essential(void);
  42 void sr32(void *, u32, u32, u32);
  43 u32 wait_on_value(u32, u32, void *, u32);
  44 void sdelay(unsigned long);
  45 void omap_rev_string(char *omap_rev_string);
  46 void setup_clocks_for_console(void);
  47 void prcm_init(void);
  48 void bypass_dpll(u32 *const base);
  49 void freq_update_core(void);
  50 u32 get_sys_clk_freq(void);
  51 u32 omap5_ddr_clk(void);
  52 void cancel_out(u32 *num, u32 *den, u32 den_limit);
  53 void sdram_init(void);
  54 u32 omap_sdram_size(void);
  55 u32 cortex_rev(void);
  56 void init_omap_revision(void);
  57 void do_io_settings(void);
  58
  59 /*
  60  * This is used to verify if the configuration header
  61  * was executed by Romcode prior to control of transfer
  62  * to the bootloader. SPL is responsible for saving and
  63  * passing this to the u-boot.
  64  */
  65 extern struct omap_boot_parameters boot_params;
  66
  67 static inline u32 running_from_sdram(void)
  68 {
  69         u32 pc;
  70         asm volatile ("mov %0, pc" : "=r" (pc));
  71         return ((pc >= OMAP54XX_DRAM_ADDR_SPACE_START) &&
  72             (pc < OMAP54XX_DRAM_ADDR_SPACE_END));
  73 }
  74
  75 static inline u8 uboot_loaded_by_spl(void)
  76 {
  77         /*
  78          * u-boot can be running from sdram either because of configuration
  79          * Header or by SPL. If because of CH, then the romcode sets the
  80          * CHSETTINGS executed bit to true in the boot parameter structure that
  81          * it passes to the bootloader.This parameter is stored in the ch_flags
  82          * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
  83          * mandatory section if CH is present.
  84          */
  85         if ((boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
  86                 return 0;
  87         else
  88                 return running_from_sdram();
  89 }
  90 /*
  91  * The basic hardware init of OMAP(s_init()) can happen in 4
  92  * different contexts:
  93  *  1. SPL running from SRAM
  94  *  2. U-Boot running from FLASH
  95  *  3. Non-XIP U-Boot loaded to SDRAM by SPL
  96  *  4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
  97  *     Configuration Header feature
  98  *
  99  * This function finds this context.
 100  * Defining as inline may help in compiling out unused functions in SPL
 101  */
 102 static inline u32 omap_hw_init_context(void)
 103 {
 104 #ifdef CONFIG_SPL_BUILD
 105         return OMAP_INIT_CONTEXT_SPL;
 106 #else
 107         if (uboot_loaded_by_spl())
 108                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
 109         else if (running_from_sdram())
 110                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
 111         else
 112                 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
 113 #endif
 114 }
 115
 116 static inline u32 omap_revision(void)
 117 {
 118         extern u32 *const omap5_revision;
 119         return *omap5_revision;
 120 }
 121
 122 #endif