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 setup_clocks_for_console(void);
46 void prcm_init(void);
47 void bypass_dpll(u32 *const base);
48 void freq_update_core(void);
49 u32 get_sys_clk_freq(void);
50 u32 omap5_ddr_clk(void);
51 void cancel_out(u32 *num, u32 *den, u32 den_limit);
52 void sdram_init(void);
53 u32 omap_sdram_size(void);
54 u32 cortex_rev(void);
55 void init_omap_revision(void);
56 void do_io_settings(void);
57 void omap_vc_init(u16 speed_khz);
58 int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data);
59 u32 warm_reset(void);
60 void force_emif_self_refresh(void);
61 
62 /*
63  * This is used to verify if the configuration header
64  * was executed by Romcode prior to control of transfer
65  * to the bootloader. SPL is responsible for saving and
66  * passing this to the u-boot.
67  */
68 extern struct omap_boot_parameters boot_params;
69 
70 static inline u32 running_from_sdram(void)
71 {
72 	u32 pc;
73 	asm volatile ("mov %0, pc" : "=r" (pc));
74 	return ((pc >= OMAP54XX_DRAM_ADDR_SPACE_START) &&
75 	    (pc < OMAP54XX_DRAM_ADDR_SPACE_END));
76 }
77 
78 static inline u8 uboot_loaded_by_spl(void)
79 {
80 	/*
81 	 * u-boot can be running from sdram either because of configuration
82 	 * Header or by SPL. If because of CH, then the romcode sets the
83 	 * CHSETTINGS executed bit to true in the boot parameter structure that
84 	 * it passes to the bootloader.This parameter is stored in the ch_flags
85 	 * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
86 	 * mandatory section if CH is present.
87 	 */
88 	if ((boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
89 		return 0;
90 	else
91 		return running_from_sdram();
92 }
93 /*
94  * The basic hardware init of OMAP(s_init()) can happen in 4
95  * different contexts:
96  *  1. SPL running from SRAM
97  *  2. U-Boot running from FLASH
98  *  3. Non-XIP U-Boot loaded to SDRAM by SPL
99  *  4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
100  *     Configuration Header feature
101  *
102  * This function finds this context.
103  * Defining as inline may help in compiling out unused functions in SPL
104  */
105 static inline u32 omap_hw_init_context(void)
106 {
107 #ifdef CONFIG_SPL_BUILD
108 	return OMAP_INIT_CONTEXT_SPL;
109 #else
110 	if (uboot_loaded_by_spl())
111 		return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
112 	else if (running_from_sdram())
113 		return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
114 	else
115 		return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
116 #endif
117 }
118 
119 #endif
120