diff options
Diffstat (limited to 'lib_blackfin/string.c')
| -rw-r--r-- | lib_blackfin/string.c | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/lib_blackfin/string.c b/lib_blackfin/string.c index 6887c93..36eecdf 100644 --- a/lib_blackfin/string.c +++ b/lib_blackfin/string.c @@ -1,7 +1,7 @@ /* * U-boot - string.c Contains library routines. * - * Copyright (c) 2005-2007 Analog Devices Inc. + * Copyright (c) 2005-2008 Analog Devices Inc. * * (C) Copyright 2000-2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. @@ -130,12 +130,22 @@ int strncmp(const char *cs, const char *ct, size_t count) # 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 -static void *dma_memcpy(void *dst, const void *src, size_t count) +/* 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) { - if (dcache_status()) - blackfin_dcache_flush_range(src, src + count); + /* 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(); - bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR); + bfin_write_MDMA_S0_CONFIG(0); + bfin_write_MDMA_D0_CONFIG(0); + bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR); /* Copy sram functions from sdram to sram */ /* Setup destination start address */ @@ -154,20 +164,33 @@ static void *dma_memcpy(void *dst, const void *src, size_t count) /* Enable source DMA */ bfin_write_MDMA_S0_CONFIG(DMAEN); - SSYNC(); bfin_write_MDMA_D0_CONFIG(WNR | DMAEN); + SSYNC(); while (bfin_read_MDMA_D0_IRQ_STATUS() & DMA_RUN) - bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR); - bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR); + continue; + + bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_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); - if (dcache_status()) - blackfin_dcache_invalidate_range(dst, dst + count); - return dst; } |