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/*
* U-boot - string.c Contains library routines.
*
* Copyright (c) 2005-2008 Analog Devices Inc.
*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <common.h>
#include <config.h>
#include <asm/blackfin.h>
#include <asm/io.h>
#include <asm/mach-common/bits/dma.h>
char *strcpy(char *dest, const char *src)
{
char *xdest = dest;
char temp = 0;
__asm__ __volatile__ (
"1:\t%2 = B [%1++] (Z);\n\t"
"B [%0++] = %2;\n\t"
"CC = %2;\n\t"
"if cc jump 1b (bp);\n"
: "=a"(dest), "=a"(src), "=d"(temp)
: "0"(dest), "1"(src), "2"(temp)
: "memory");
return xdest;
}
char *strncpy(char *dest, const char *src, size_t n)
{
char *xdest = dest;
char temp = 0;
if (n == 0)
return xdest;
__asm__ __volatile__ (
"1:\t%3 = B [%1++] (Z);\n\t"
"B [%0++] = %3;\n\t"
"CC = %3;\n\t"
"if ! cc jump 2f;\n\t"
"%2 += -1;\n\t"
"CC = %2 == 0;\n\t"
"if ! cc jump 1b (bp);\n"
"2:\n"
: "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
: "0"(dest), "1"(src), "2"(n), "3"(temp)
: "memory");
return xdest;
}
int strcmp(const char *cs, const char *ct)
{
char __res1, __res2;
__asm__ (
"1:\t%2 = B[%0++] (Z);\n\t" /* get *cs */
"%3 = B[%1++] (Z);\n\t" /* get *ct */
"CC = %2 == %3;\n\t" /* compare a byte */
"if ! cc jump 2f;\n\t" /* not equal, break out */
"CC = %2;\n\t" /* at end of cs? */
"if cc jump 1b (bp);\n\t" /* no, keep going */
"jump.s 3f;\n" /* strings are equal */
"2:\t%2 = %2 - %3;\n" /* *cs - *ct */
"3:\n"
: "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
: "0"(cs), "1"(ct));
return __res1;
}
int strncmp(const char *cs, const char *ct, size_t count)
{
char __res1, __res2;
if (!count)
return 0;
__asm__(
"1:\t%3 = B[%0++] (Z);\n\t" /* get *cs */
"%4 = B[%1++] (Z);\n\t" /* get *ct */
"CC = %3 == %4;\n\t" /* compare a byte */
"if ! cc jump 3f;\n\t" /* not equal, break out */
"CC = %3;\n\t" /* at end of cs? */
"if ! cc jump 4f;\n\t" /* yes, all done */
"%2 += -1;\n\t" /* no, adjust count */
"CC = %2 == 0;\n\t" "if ! cc jump 1b;\n" /* more to do, keep going */
"2:\t%3 = 0;\n\t" /* strings are equal */
"jump.s 4f;\n" "3:\t%3 = %3 - %4;\n" /* *cs - *ct */
"4:"
: "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
: "0"(cs), "1"(ct), "2"(count));
return __res1;
}
#ifdef bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_write_MDMA_D0_START_ADDR bfin_write_MDMA1_D0_START_ADDR
# define bfin_write_MDMA_D0_X_COUNT bfin_write_MDMA1_D0_X_COUNT
# define bfin_write_MDMA_D0_X_MODIFY bfin_write_MDMA1_D0_X_MODIFY
# define bfin_write_MDMA_D0_CONFIG bfin_write_MDMA1_D0_CONFIG
# define bfin_write_MDMA_S0_START_ADDR bfin_write_MDMA1_S0_START_ADDR
# define bfin_write_MDMA_S0_X_COUNT bfin_write_MDMA1_S0_X_COUNT
# define bfin_write_MDMA_S0_X_MODIFY bfin_write_MDMA1_S0_X_MODIFY
# define bfin_write_MDMA_S0_CONFIG bfin_write_MDMA1_S0_CONFIG
# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_read_MDMA_D0_IRQ_STATUS bfin_read_MDMA1_D0_IRQ_STATUS
#endif
/* This version misbehaves for count values of 0 and 2^16+.
* Perhaps we should detect that ? Nowhere do we actually
* use dma memcpy for those types of lengths though ...
*/
void dma_memcpy_nocache(void *dst, const void *src, size_t count)
{
uint16_t wdsize, mod;
/* Disable DMA in case it's still running (older u-boot's did not
* always turn them off). Do it before the if statement below so
* we can be cheap and not do a SSYNC() due to the forced abort.
*/
bfin_write_MDMA_D0_CONFIG(0);
bfin_write_MDMA_S0_CONFIG(0);
bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
/* Scratchpad cannot be a DMA source or destination */
if (((unsigned long)src >= L1_SRAM_SCRATCH &&
(unsigned long)src < L1_SRAM_SCRATCH_END) ||
((unsigned long)dst >= L1_SRAM_SCRATCH &&
(unsigned long)dst < L1_SRAM_SCRATCH_END))
hang();
if (((unsigned long)dst | (unsigned long)src | count) & 0x1) {
wdsize = WDSIZE_8;
mod = 1;
} else if (((unsigned long)dst | (unsigned long)src | count) & 0x2) {
wdsize = WDSIZE_16;
count >>= 1;
mod = 2;
} else {
wdsize = WDSIZE_32;
count >>= 2;
mod = 4;
}
/* Copy sram functions from sdram to sram */
/* Setup destination start address */
bfin_write_MDMA_D0_START_ADDR(dst);
/* Setup destination xcount */
bfin_write_MDMA_D0_X_COUNT(count);
/* Setup destination xmodify */
bfin_write_MDMA_D0_X_MODIFY(mod);
/* Setup Source start address */
bfin_write_MDMA_S0_START_ADDR(src);
/* Setup Source xcount */
bfin_write_MDMA_S0_X_COUNT(count);
/* Setup Source xmodify */
bfin_write_MDMA_S0_X_MODIFY(mod);
/* Enable source DMA */
bfin_write_MDMA_S0_CONFIG(wdsize | DMAEN);
bfin_write_MDMA_D0_CONFIG(wdsize | DMAEN | WNR | DI_EN);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
continue;
bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
bfin_write_MDMA_D0_CONFIG(0);
bfin_write_MDMA_S0_CONFIG(0);
}
/* We should do a dcache invalidate on the destination after the dma, but since
* we lack such hardware capability, we'll flush/invalidate the destination
* before the dma and bank on the idea that u-boot is single threaded.
*/
void *dma_memcpy(void *dst, const void *src, size_t count)
{
if (dcache_status()) {
blackfin_dcache_flush_range(src, src + count);
blackfin_dcache_flush_invalidate_range(dst, dst + count);
}
dma_memcpy_nocache(dst, src, count);
if (icache_status())
blackfin_icache_flush_range(dst, dst + count);
return dst;
}
/*
* memcpy - Copy one area of memory to another
* @dest: Where to copy to
* @src: Where to copy from
* @count: The size of the area.
*
* We need to have this wrapper in memcpy() as common code may call memcpy()
* to load up L1 regions. Consider loading an ELF which has sections with
* LMA's pointing to L1. The common code ELF loader will simply use memcpy()
* to move the ELF's sections into the right place. We need to catch that
* here and redirect to dma_memcpy().
*/
extern void *memcpy_ASM(void *dst, const void *src, size_t count);
void *memcpy(void *dst, const void *src, size_t count)
{
if (!count)
return dst;
if (addr_bfin_on_chip_mem(dst)) {
/* L1 is the destination */
return dma_memcpy(dst, src, count);
} else if (addr_bfin_on_chip_mem(src)) {
/* L1 is the source */
return dma_memcpy(dst, src, count);
} else
/* No L1 is involved, so just call regular memcpy */
return memcpy_ASM(dst, src, count);
}
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