u-boot/arch/blackfin/lib/string.c

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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.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <config.h>
#include <asm/blackfin.h>
#include <asm/io.h>
#include <asm/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 MDMA1_D0_NEXT_DESC_PTR
# define MDMA_D0_NEXT_DESC_PTR MDMA1_D0_NEXT_DESC_PTR
# define MDMA_S0_NEXT_DESC_PTR MDMA1_S0_NEXT_DESC_PTR
#endif
static void dma_calc_size(unsigned long ldst, unsigned long lsrc, size_t count,
unsigned long *dshift, unsigned long *bpos)
{
unsigned long limit;
#ifdef MSIZE
/* The max memory DMA memory transfer size is 32 bytes. */
limit = 5;
*dshift = MSIZE_P;
#else
/* The max memory DMA memory transfer size is 4 bytes. */
limit = 2;
*dshift = WDSIZE_P;
#endif
*bpos = min(limit, ffs(ldst | lsrc | count)) - 1;
}
/* 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)
{
struct dma_register *mdma_d0 = (void *)MDMA_D0_NEXT_DESC_PTR;
struct dma_register *mdma_s0 = (void *)MDMA_S0_NEXT_DESC_PTR;
unsigned long ldst = (unsigned long)dst;
unsigned long lsrc = (unsigned long)src;
unsigned long dshift, bpos;
uint32_t dsize, 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->status, DMA_RUN | DMA_DONE | DMA_ERR);
/* Scratchpad cannot be a DMA source or destination */
if ((lsrc >= L1_SRAM_SCRATCH && lsrc < L1_SRAM_SCRATCH_END) ||
(ldst >= L1_SRAM_SCRATCH && ldst < L1_SRAM_SCRATCH_END))
hang();
dma_calc_size(ldst, lsrc, count, &dshift, &bpos);
dsize = bpos << dshift;
count >>= bpos;
mod = 1 << bpos;
#ifdef PSIZE
/* The max memory DMA peripheral transfer size is 4 bytes. */
dsize |= min(2, bpos) << PSIZE_P;
#endif
/* Copy sram functions from sdram to sram */
/* Setup destination start address */
bfin_write(&mdma_d0->start_addr, ldst);
/* 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, lsrc);
/* 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, dsize | DMAEN);
bfin_write(&mdma_d0->config, dsize | DMAEN | WNR | DI_EN);
SSYNC();
while (!(bfin_read(&mdma_d0->status) & DMA_DONE))
continue;
bfin_write(&mdma_d0->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;
#ifdef CONFIG_CMD_KGDB
if (src >= (void *)SYSMMR_BASE) {
if (count == 2 && (unsigned long)src % 2 == 0) {
u16 mmr = bfin_read16(src);
memcpy(dst, &mmr, sizeof(mmr));
return dst;
}
if (count == 4 && (unsigned long)src % 4 == 0) {
u32 mmr = bfin_read32(src);
memcpy(dst, &mmr, sizeof(mmr));
return dst;
}
/* Failed for some reason */
memset(dst, 0xad, count);
return dst;
}
if (dst >= (void *)SYSMMR_BASE) {
if (count == 2 && (unsigned long)dst % 2 == 0) {
u16 mmr;
memcpy(&mmr, src, sizeof(mmr));
bfin_write16(dst, mmr);
return dst;
}
if (count == 4 && (unsigned long)dst % 4 == 0) {
u32 mmr;
memcpy(&mmr, src, sizeof(mmr));
bfin_write32(dst, mmr);
return dst;
}
/* Failed for some reason */
memset(dst, 0xad, count);
return dst;
}
#endif
/* if L1 is the source or dst, use DMA */
if (addr_bfin_on_chip_mem(dst) || addr_bfin_on_chip_mem(src))
return dma_memcpy(dst, src, count);
else
/* No L1 is involved, so just call regular memcpy */
return memcpy_ASM(dst, src, count);
}