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/omap4.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 extern struct omap4_prcm_regs *const prcm;
  36
  37 void gpmc_init(void);
  38 void watchdog_init(void);
  39 u32 get_device_type(void);
  40 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size);
  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 set_pl310_ctrl_reg(u32 val);
  46 void omap_rev_string(char *omap4_rev_string);
  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 sdram_init(void);
  53 u32 omap4_sdram_size(void);
  54
  55 static inline u32 running_from_sdram(void)
  56 {
  57         u32 pc;
  58         asm volatile ("mov %0, pc" : "=r" (pc));
  59         return ((pc >= OMAP44XX_DRAM_ADDR_SPACE_START) &&
  60             (pc < OMAP44XX_DRAM_ADDR_SPACE_END));
  61 }
  62
  63 static inline u8 uboot_loaded_by_spl(void)
  64 {
  65         /*
  66          * Configuration Header is not supported yet, so u-boot init running
  67          * from SDRAM implies that it was loaded by SPL. When this situation
  68          * changes one of these approaches could be taken:
  69          * i.  Pass a magic from SPL to U-Boot and U-Boot save it at a known
  70          *     location.
  71          * ii. Check the OPP. CH can support only 50% OPP while SPL initializes
  72          *     the DPLLs at 100% OPP.
  73          */
  74         return running_from_sdram();
  75 }
  76 /*
  77  * The basic hardware init of OMAP(s_init()) can happen in 4
  78  * different contexts:
  79  *  1. SPL running from SRAM
  80  *  2. U-Boot running from FLASH
  81  *  3. Non-XIP U-Boot loaded to SDRAM by SPL
  82  *  4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
  83  *     Configuration Header feature
  84  *
  85  * This function finds this context.
  86  * Defining as inline may help in compiling out unused functions in SPL
  87  */
  88 static inline u32 omap4_hw_init_context(void)
  89 {
  90 #ifdef CONFIG_SPL_BUILD
  91         return OMAP_INIT_CONTEXT_SPL;
  92 #else
  93         if (uboot_loaded_by_spl())
  94                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
  95         else if (running_from_sdram())
  96                 return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
  97         else
  98                 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
  99 #endif
 100 }
 101
 102 static inline u32 omap_revision(void)
 103 {
 104         extern u32 *const omap4_revision;
 105         return *omap4_revision;
 106 }
 107
 108 #endif