arch/arm/include/asm/arch-omap4/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/arch/clocks.h>
  26 #include <asm/io.h>
  27 #include <asm/omap_common.h>
  28 #include <asm/arch/mux_omap4.h>
  29
  30 struct omap_sysinfo {
  31         char *board_string;
  32 };
  33 extern const struct omap_sysinfo sysinfo;
  34
  35 void gpmc_init(void);
  36 void watchdog_init(void);
  37 u32 get_device_type(void);
  38 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size);
  39 void set_muxconf_regs_essential(void);
  40 void set_muxconf_regs_non_essential(void);
  41 void sr32(void *, u32, u32, u32);
  42 u32 wait_on_value(u32, u32, void *, u32);
  43 void sdelay(unsigned long);
  44 void set_pl310_ctrl_reg(u32 val);
  45 void omap_rev_string(void);
  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 omap4_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 void omap_vc_init(u16 speed_khz);
  59 int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data);
  60 /*
  61  * This is used to verify if the configuration header
  62  * was executed by Romcode prior to control of transfer
  63  * to the bootloader. SPL is responsible for saving and
  64  * passing this to the u-boot.
  65  */
  66 extern struct omap_boot_parameters boot_params;
  67
  68 static inline u32 running_from_sdram(void)
  69 {
  70         u32 pc;
  71         asm volatile ("mov %0, pc" : "=r" (pc));
  72         return ((pc >= OMAP44XX_DRAM_ADDR_SPACE_START) &&
  73             (pc < OMAP44XX_DRAM_ADDR_SPACE_END));
  74 }
  75
  76 static inline u8 uboot_loaded_by_spl(void)
  77 {
  78         /*
  79          * u-boot can be running from sdram either because of configuration
  80          * Header or by SPL. If because of CH, then the romcode sets the
  81          * CHSETTINGS executed bit to true in the boot parameter structure that
  82          * it passes to the bootloader.This parameter is stored in the ch_flags
  83          * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
  84          * mandatory section if CH is present.
  85          */
  86         if ((boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
  87                 return 0;
  88         else
  89                 return running_from_sdram();
  90 }
  91 /*
  92  * The basic hardware init of OMAP(s_init()) can happen in 4
  93  * different contexts:
  94  *  1. SPL running from SRAM
  95  *  2. U-Boot running from FLASH
  96  *  3. Non-XIP U-Boot loaded to SDRAM by SPL
  97  *  4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
  98  *     Configuration Header feature
  99  *
 100  * This function finds this context.
 101  * Defining as inline may help in compiling out unused functions in SPL
 102  */
 103 static inline u32 omap_hw_init_context(void)
 104 {
 105 #ifdef CONFIG_SPL_BUILD
 106         return OMAP_INIT_CONTEXT_SPL;
 107 #else
 108         if (uboot_loaded_by_spl())
 109                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
 110         else if (running_from_sdram())
 111                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
 112         else
 113                 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
 114 #endif
 115 }
 116
 117 #endif