lib_blackfin/string.c

   1 /*
   2  * U-boot - string.c Contains library routines.
   3  *
   4  * Copyright (c) 2005-2007 Analog Devices Inc.
   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., 51 Franklin St, Fifth Floor, Boston,
  25  * MA 02110-1301 USA
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <asm/blackfin.h>
  31 #include <asm/io.h>
  32 #include <asm/mach-common/bits/dma.h>
  33
  34 char *strcpy(char *dest, const char *src)
  35 {
  36         char *xdest = dest;
  37         char temp = 0;
  38
  39         __asm__ __volatile__ (
  40                 "1:\t%2 = B [%1++] (Z);\n\t"
  41                 "B [%0++] = %2;\n\t"
  42                 "CC = %2;\n\t"
  43                 "if cc jump 1b (bp);\n"
  44                 : "=a"(dest), "=a"(src), "=d"(temp)
  45                 : "0"(dest), "1"(src), "2"(temp)
  46                 : "memory");
  47
  48         return xdest;
  49 }
  50
  51 char *strncpy(char *dest, const char *src, size_t n)
  52 {
  53         char *xdest = dest;
  54         char temp = 0;
  55
  56         if (n == 0)
  57                 return xdest;
  58
  59         __asm__ __volatile__ (
  60                 "1:\t%3 = B [%1++] (Z);\n\t"
  61                 "B [%0++] = %3;\n\t"
  62                 "CC = %3;\n\t"
  63                 "if ! cc jump 2f;\n\t"
  64                 "%2 += -1;\n\t"
  65                 "CC = %2 == 0;\n\t"
  66                 "if ! cc jump 1b (bp);\n"
  67                 "2:\n"
  68                 : "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
  69                 : "0"(dest), "1"(src), "2"(n), "3"(temp)
  70                 : "memory");
  71
  72         return xdest;
  73 }
  74
  75 int strcmp(const char *cs, const char *ct)
  76 {
  77         char __res1, __res2;
  78
  79         __asm__ (
  80                 "1:\t%2 = B[%0++] (Z);\n\t"     /* get *cs */
  81                 "%3 = B[%1++] (Z);\n\t" /* get *ct */
  82                 "CC = %2 == %3;\n\t"    /* compare a byte */
  83                 "if ! cc jump 2f;\n\t"  /* not equal, break out */
  84                 "CC = %2;\n\t"  /* at end of cs? */
  85                 "if cc jump 1b (bp);\n\t"       /* no, keep going */
  86                 "jump.s 3f;\n"  /* strings are equal */
  87                 "2:\t%2 = %2 - %3;\n"   /* *cs - *ct */
  88                 "3:\n"
  89                 : "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
  90                 : "0"(cs), "1"(ct));
  91
  92         return __res1;
  93 }
  94
  95 int strncmp(const char *cs, const char *ct, size_t count)
  96 {
  97         char __res1, __res2;
  98
  99         if (!count)
 100                 return 0;
 101
 102         __asm__(
 103                 "1:\t%3 = B[%0++] (Z);\n\t"     /* get *cs */
 104                 "%4 = B[%1++] (Z);\n\t" /* get *ct */
 105                 "CC = %3 == %4;\n\t"    /* compare a byte */
 106                 "if ! cc jump 3f;\n\t"  /* not equal, break out */
 107                 "CC = %3;\n\t"  /* at end of cs? */
 108                 "if ! cc jump 4f;\n\t"  /* yes, all done */
 109                 "%2 += -1;\n\t" /* no, adjust count */
 110                 "CC = %2 == 0;\n\t" "if ! cc jump 1b;\n"        /* more to do, keep going */
 111                 "2:\t%3 = 0;\n\t"       /* strings are equal */
 112                 "jump.s    4f;\n" "3:\t%3 = %3 - %4;\n" /* *cs - *ct */
 113                 "4:"
 114                 : "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
 115                 : "0"(cs), "1"(ct), "2"(count));
 116
 117         return __res1;
 118 }
 119
 120 #ifdef bfin_write_MDMA1_D0_IRQ_STATUS
 121 # define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
 122 # define bfin_write_MDMA_D0_START_ADDR bfin_write_MDMA1_D0_START_ADDR
 123 # define bfin_write_MDMA_D0_X_COUNT    bfin_write_MDMA1_D0_X_COUNT
 124 # define bfin_write_MDMA_D0_X_MODIFY   bfin_write_MDMA1_D0_X_MODIFY
 125 # define bfin_write_MDMA_D0_CONFIG     bfin_write_MDMA1_D0_CONFIG
 126 # define bfin_write_MDMA_S0_START_ADDR bfin_write_MDMA1_S0_START_ADDR
 127 # define bfin_write_MDMA_S0_X_COUNT    bfin_write_MDMA1_S0_X_COUNT
 128 # define bfin_write_MDMA_S0_X_MODIFY   bfin_write_MDMA1_S0_X_MODIFY
 129 # define bfin_write_MDMA_S0_CONFIG     bfin_write_MDMA1_S0_CONFIG
 130 # define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
 131 # define bfin_read_MDMA_D0_IRQ_STATUS  bfin_read_MDMA1_D0_IRQ_STATUS
 132 #endif
 133 static void *dma_memcpy(void *dst, const void *src, size_t count)
 134 {
 135         if (dcache_status())
 136                 blackfin_dcache_flush_range(src, src + count);
 137
 138         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 139
 140         /* Copy sram functions from sdram to sram */
 141         /* Setup destination start address */
 142         bfin_write_MDMA_D0_START_ADDR(dst);
 143         /* Setup destination xcount */
 144         bfin_write_MDMA_D0_X_COUNT(count);
 145         /* Setup destination xmodify */
 146         bfin_write_MDMA_D0_X_MODIFY(1);
 147
 148         /* Setup Source start address */
 149         bfin_write_MDMA_S0_START_ADDR(src);
 150         /* Setup Source xcount */
 151         bfin_write_MDMA_S0_X_COUNT(count);
 152         /* Setup Source xmodify */
 153         bfin_write_MDMA_S0_X_MODIFY(1);
 154
 155         /* Enable source DMA */
 156         bfin_write_MDMA_S0_CONFIG(DMAEN);
 157         SSYNC();
 158
 159         bfin_write_MDMA_D0_CONFIG(WNR | DMAEN);
 160
 161         while (bfin_read_MDMA_D0_IRQ_STATUS() & DMA_RUN)
 162                 bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
 163         bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
 164
 165         if (icache_status())
 166                 blackfin_icache_flush_range(dst, dst + count);
 167
 168         if (dcache_status())
 169                 blackfin_dcache_invalidate_range(dst, dst + count);
 170
 171         return dst;
 172 }
 173
 174 /*
 175  * memcpy - Copy one area of memory to another
 176  * @dest: Where to copy to
 177  * @src: Where to copy from
 178  * @count: The size of the area.
 179  *
 180  * We need to have this wrapper in memcpy() as common code may call memcpy()
 181  * to load up L1 regions.  Consider loading an ELF which has sections with
 182  * LMA's pointing to L1.  The common code ELF loader will simply use memcpy()
 183  * to move the ELF's sections into the right place.  We need to catch that
 184  * here and redirect to dma_memcpy().
 185  */
 186 extern void *memcpy_ASM(void *dst, const void *src, size_t count);
 187 void *memcpy(void *dst, const void *src, size_t count)
 188 {
 189         if (!count)
 190                 return dst;
 191
 192         if (addr_bfin_on_chip_mem(dst)) {
 193                 /* L1 is the destination */
 194                 return dma_memcpy(dst, src, count);
 195
 196         } else if (addr_bfin_on_chip_mem(src)) {
 197                 /* L1 is the source */
 198                 return dma_memcpy(dst, src, count);
 199
 200         } else
 201                 /* No L1 is involved, so just call regular memcpy */
 202                 return memcpy_ASM(dst, src, count);
 203 }