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/io.h> 26 #include <asm/omap_common.h> 27 28 struct omap_sysinfo { 29 char *board_string; 30 }; 31 extern const struct omap_sysinfo sysinfo; 32 33 void gpmc_init(void); 34 void watchdog_init(void); 35 u32 get_device_type(void); 36 void set_muxconf_regs(void); 37 void sr32(void *, u32, u32, u32); 38 u32 wait_on_value(u32, u32, void *, u32); 39 void sdelay(unsigned long); 40 void set_pl310_ctrl_reg(u32 val); 41 42 static inline u32 running_from_sdram(void) 43 { 44 u32 pc; 45 asm volatile ("mov %0, pc" : "=r" (pc)); 46 return ((pc >= OMAP44XX_DRAM_ADDR_SPACE_START) && 47 (pc < OMAP44XX_DRAM_ADDR_SPACE_END)); 48 } 49 50 static inline u8 uboot_loaded_by_spl(void) 51 { 52 /* 53 * Configuration Header is not supported yet, so u-boot init running 54 * from SDRAM implies that it was loaded by SPL. When this situation 55 * changes one of these approaches could be taken: 56 * i. Pass a magic from SPL to U-Boot and U-Boot save it at a known 57 * location. 58 * ii. Check the OPP. CH can support only 50% OPP while SPL initializes 59 * the DPLLs at 100% OPP. 60 */ 61 return running_from_sdram(); 62 } 63 /* 64 * The basic hardware init of OMAP(s_init()) can happen in 4 65 * different contexts: 66 * 1. SPL running from SRAM 67 * 2. U-Boot running from FLASH 68 * 3. Non-XIP U-Boot loaded to SDRAM by SPL 69 * 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the 70 * Configuration Header feature 71 * 72 * This function finds this context. 73 * Defining as inline may help in compiling out unused functions in SPL 74 */ 75 static inline u32 omap4_hw_init_context(void) 76 { 77 #ifdef CONFIG_SPL_BUILD 78 return OMAP_INIT_CONTEXT_SPL; 79 #else 80 if (uboot_loaded_by_spl()) 81 return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL; 82 else if (running_from_sdram()) 83 return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH; 84 else 85 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR; 86 #endif 87 } 88 89 #endif 90