2 * (C) Copyright 2004 Texas Insturments
5 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * See file CREDITS for list of people who contributed to this
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
36 #include <asm/system.h>
38 static void cache_flush(void);
40 int cleanup_before_linux (void)
43 * this function is called just before we call linux
44 * it prepares the processor for linux
46 * we turn off caches etc ...
49 disable_interrupts ();
53 extern void lcd_disable(void);
54 extern void lcd_panel_disable(void);
56 lcd_disable(); /* proper disable of lcd & panel */
61 /* turn off I/D-cache */
70 static void cache_flush(void)
73 /* clean entire data cache */
74 asm volatile("mcr p15, 0, %0, c7, c10, 0" : : "r" (i));
75 /* invalidate both caches and flush btb */
76 asm volatile("mcr p15, 0, %0, c7, c7, 0" : : "r" (i));
77 /* mem barrier to sync things */
78 asm volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (i));
81 #ifndef CONFIG_SYS_DCACHE_OFF
83 #ifndef CONFIG_SYS_CACHELINE_SIZE
84 #define CONFIG_SYS_CACHELINE_SIZE 32
87 void invalidate_dcache_all(void)
89 asm volatile("mcr p15, 0, %0, c7, c6, 0" : : "r" (0));
92 void flush_dcache_all(void)
94 asm volatile("mcr p15, 0, %0, c7, c10, 0" : : "r" (0));
95 asm volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
98 static int check_cache_range(unsigned long start, unsigned long stop)
102 if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
105 if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
109 debug("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
115 void invalidate_dcache_range(unsigned long start, unsigned long stop)
117 if (!check_cache_range(start, stop))
120 while (start < stop) {
121 asm volatile("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
122 start += CONFIG_SYS_CACHELINE_SIZE;
126 void flush_dcache_range(unsigned long start, unsigned long stop)
128 if (!check_cache_range(start, stop))
131 while (start < stop) {
132 asm volatile("mcr p15, 0, %0, c7, c14, 1" : : "r" (start));
133 start += CONFIG_SYS_CACHELINE_SIZE;
136 asm volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
139 void flush_cache(unsigned long start, unsigned long size)
141 flush_dcache_range(start, start + size);
144 #else /* #ifndef CONFIG_SYS_DCACHE_OFF */
145 void invalidate_dcache_all(void)
149 void flush_dcache_all(void)
153 void invalidate_dcache_range(unsigned long start, unsigned long stop)
157 void flush_dcache_range(unsigned long start, unsigned long stop)
161 void flush_cache(unsigned long start, unsigned long size)
164 #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
166 #if !defined(CONFIG_SYS_ICACHE_OFF) || !defined(CONFIG_SYS_DCACHE_OFF)
167 void enable_caches(void)
169 #ifndef CONFIG_SYS_ICACHE_OFF
172 #ifndef CONFIG_SYS_DCACHE_OFF