Merge: Add support for AMCC 440SPe CPU based eval board (Yucca).
[platform/kernel/u-boot.git] / lib_blackfin / bf533_string.c
1 /*
2  * U-boot - bf533_string.c Contains library routines.
3  *
4  * Copyright (c) 2005 blackfin.uclinux.org
5  *
6  * (C) Copyright 2000-2004
7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8  *
9  * See file CREDITS for list of people who contributed to this
10  * project.
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License as
14  * published by the Free Software Foundation; either version 2 of
15  * the License, or (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25  * MA 02111-1307 USA
26  */
27
28 #include <common.h>
29 #include <asm/setup.h>
30 #include <asm/page.h>
31 #include <asm/cpu/defBF533.h>
32
33 void *dma_memcpy(void *,const void *,size_t);
34
35 char *strcpy(char *dest, const char *src)
36 {
37         char *xdest = dest;
38         char temp = 0;
39
40         __asm__ __volatile__
41                 ("1:\t%2 = B [%1++] (Z);\n\t"
42                 "B [%0++] = %2;\n\t"
43                 "CC = %2;\n\t"
44                 "if cc jump 1b (bp);\n":"=a"(dest), "=a"(src), "=d"(temp)
45                 :"0"(dest), "1"(src), "2"(temp):"memory");
46
47         return xdest;
48 }
49
50 char *strncpy(char *dest, const char *src, size_t n)
51 {
52         char *xdest = dest;
53         char temp = 0;
54
55         if (n == 0)
56                 return xdest;
57
58         __asm__ __volatile__
59                 ("1:\t%3 = B [%1++] (Z);\n\t"
60                 "B [%0++] = %3;\n\t"
61                 "CC = %3;\n\t"
62                 "if ! cc jump 2f;\n\t"
63                 "%2 += -1;\n\t"
64                 "CC = %2 == 0;\n\t"
65                 "if ! cc jump 1b (bp);\n"
66                 "2:\n":"=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
67                 :"0"(dest), "1"(src), "2"(n), "3"(temp)
68                 :"memory");
69
70         return xdest;
71 }
72
73 int strcmp(const char *cs, const char *ct)
74 {
75         char __res1, __res2;
76
77         __asm__
78                 ("1:\t%2 = B[%0++] (Z);\n\t"    /* get *cs */
79                 "%3 = B[%1++] (Z);\n\t"         /* get *ct */
80                 "CC = %2 == %3;\n\t"            /* compare a byte */
81                 "if ! cc jump 2f;\n\t"          /* not equal, break out */
82                 "CC = %2;\n\t"                  /* at end of cs? */
83                 "if cc jump 1b (bp);\n\t"       /* no, keep going */
84                 "jump.s 3f;\n"                  /* strings are equal */
85                 "2:\t%2 = %2 - %3;\n"           /* *cs - *ct */
86                 "3:\n": "=a"(cs), "=a"(ct), "=d"(__res1),
87                 "=d"(__res2)
88                 : "0"(cs), "1"(ct));
89
90         return __res1;
91 }
92
93 int strncmp(const char *cs, const char *ct, size_t count)
94 {
95         char __res1, __res2;
96
97         if (!count)
98                 return 0;
99
100         __asm__
101                 ("1:\t%3 = B[%0++] (Z);\n\t"    /* get *cs */
102                 "%4 = B[%1++] (Z);\n\t"         /* get *ct */
103                 "CC = %3 == %4;\n\t"            /* compare a byte */
104                 "if ! cc jump 3f;\n\t"          /* not equal, break out */
105                 "CC = %3;\n\t"                  /* at end of cs? */
106                 "if ! cc jump 4f;\n\t"          /* yes, all done */
107                 "%2 += -1;\n\t"                 /* no, adjust count */
108                 "CC = %2 == 0;\n\t" "if ! cc jump 1b;\n"        /* more to do, keep going */
109                 "2:\t%3 = 0;\n\t"               /* strings are equal */
110                 "jump.s    4f;\n" "3:\t%3 = %3 - %4;\n" /* *cs - *ct */
111                 "4:":   "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1),
112                 "=d"(__res2)
113                 : "0"(cs), "1"(ct), "2"(count));
114
115         return __res1;
116 }
117
118 /*
119  * memcpy - Copy one area of memory to another
120  * @dest: Where to copy to
121  * @src: Where to copy from
122  * @count: The size of the area.
123  *
124  * You should not use this function to access IO space, use memcpy_toio()
125  * or memcpy_fromio() instead.
126  */
127 void * memcpy(void * dest,const void *src,size_t count)
128 {
129         char *tmp = (char *) dest, *s = (char *) src;
130
131 /* Turn off the cache, if destination in the L1 memory */
132         if ( (tmp >= (char *)L1_ISRAM) && (tmp < (char *)L1_ISRAM_END)
133                 || (tmp >= (char *)DATA_BANKA_SRAM) && (tmp < DATA_BANKA_SRAM_END)
134             || (tmp >= (char *)DATA_BANKB_SRAM) && (tmp < DATA_BANKB_SRAM_END) ){
135                         if(icache_status()){
136                                         blackfin_icache_flush_range(src, src+count);
137                                         icache_disable();
138                         }
139                         if(dcache_status()){
140                                         blackfin_dcache_flush_range(src, src+count);
141                                         dcache_disable();
142                         }
143                         dma_memcpy(dest,src,count);
144         }else{
145                 while(count--)
146                         *tmp++ = *s++;
147         }
148         return dest;
149 }
150
151 void *dma_memcpy(void * dest,const void *src,size_t count)
152 {
153
154                 *pMDMA_D0_IRQ_STATUS = DMA_DONE | DMA_ERR;
155
156                 /* Copy sram functions from sdram to sram */
157                 /* Setup destination start address */
158                 *pMDMA_D0_START_ADDR = (volatile void **)dest;
159                 /* Setup destination xcount */
160                 *pMDMA_D0_X_COUNT = count ;
161                 /* Setup destination xmodify */
162                 *pMDMA_D0_X_MODIFY = 1;
163
164                 /* Setup Source start address */
165                 *pMDMA_S0_START_ADDR = (volatile void **)src;
166                 /* Setup Source xcount */
167                 *pMDMA_S0_X_COUNT = count;
168                 /* Setup Source xmodify */
169                 *pMDMA_S0_X_MODIFY = 1;
170
171                 /* Enable source DMA */
172                 *pMDMA_S0_CONFIG = (DMAEN);
173                 asm("ssync;");
174
175                 *pMDMA_D0_CONFIG = ( WNR | DMAEN);
176
177                 while(*pMDMA_D0_IRQ_STATUS & DMA_RUN){
178                         *pMDMA_D0_IRQ_STATUS |= (DMA_DONE | DMA_ERR);
179                 }
180                 *pMDMA_D0_IRQ_STATUS |= (DMA_DONE | DMA_ERR);
181
182                 dest += count;
183                 src  += count;
184                 return dest;
185 }