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Diffstat (limited to 'lib_blackfin/string.c')
-rw-r--r--lib_blackfin/string.c45
1 files changed, 34 insertions, 11 deletions
diff --git a/lib_blackfin/string.c b/lib_blackfin/string.c
index 6887c93dec..36eecdff4c 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;
}