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Subject[PATCH 09/32] Blackfin arch: DMA operation cleanup
Date
From: Michael Hennerich <michael.hennerich@analog.com>

1) Disable Interrupts during DMA memcpy to avoid raise conditions.
2) Mark MDMA channel 0 as reserved, since were using it internally.
3) Add DMA based equivalents for insX and outsX.
4) Our insX and outsX only handles len <= 2^16.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
arch/blackfin/kernel/bfin_dma_5xx.c | 204 ++++++++++++++++++++++++++++++++++-
include/asm-blackfin/io.h | 20 +++-
2 files changed, 214 insertions(+), 10 deletions(-)

diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 1431424..1c344ac 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -130,7 +130,9 @@ static int __init blackfin_dma_init(void)
dma_ch[i].regs = base_addr[i];
mutex_init(&(dma_ch[i].dmalock));
}
-
+ /* Mark MEMDMA Channel 0 as requested since we're using it internally */
+ dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED;
+ dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED;
return 0;
}

@@ -598,9 +600,12 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
int direction; /* 1 - address decrease, 0 - address increase */
int flag_align; /* 1 - address aligned, 0 - address unaligned */
int flag_2D; /* 1 - 2D DMA needed, 0 - 1D DMA needed */
+ unsigned long flags;

if (size <= 0)
return NULL;
+
+ local_irq_save(flags);

if ((unsigned long)src < memory_end)
blackfin_dcache_flush_range((unsigned int)src,
@@ -725,6 +730,7 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
if ((unsigned long)dest < memory_end)
blackfin_dcache_invalidate_range((unsigned int)dest,
(unsigned int)(dest + size));
+ local_irq_restore(flags);

return dest;
}
@@ -732,11 +738,201 @@ EXPORT_SYMBOL(dma_memcpy);

void *safe_dma_memcpy(void *dest, const void *src, size_t size)
{
- int flags = 0;
void *addr;
- local_irq_save(flags);
addr = dma_memcpy(dest, src, size);
- local_irq_restore(flags);
return addr;
}
EXPORT_SYMBOL(safe_dma_memcpy);
+
+void dma_outsb(void __iomem *addr, const void *buf, unsigned short len)
+{
+
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ blackfin_dcache_flush_range((unsigned int)buf,(unsigned int)(buf) + len);
+
+ bfin_write_MDMA_D0_START_ADDR(addr);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(0);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(buf);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(1);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_outsb);
+
+
+void dma_insb(const void __iomem *addr, void *buf, unsigned short len)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ bfin_write_MDMA_D0_START_ADDR(buf);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(1);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(addr);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(0);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
+
+ blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_insb);
+
+void dma_outsw(void __iomem *addr, const void *buf, unsigned short len)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ blackfin_dcache_flush_range((unsigned int)buf,(unsigned int)(buf) + len);
+
+ bfin_write_MDMA_D0_START_ADDR(addr);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(0);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(buf);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(2);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_outsw);
+
+void dma_insw(const void __iomem *addr, void *buf, unsigned short len)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ bfin_write_MDMA_D0_START_ADDR(buf);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(2);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(addr);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(0);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
+
+ blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_insw);
+
+void dma_outsl(void __iomem *addr, const void *buf, unsigned short len)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ blackfin_dcache_flush_range((unsigned int)buf,(unsigned int)(buf) + len);
+
+ bfin_write_MDMA_D0_START_ADDR(addr);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(0);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(buf);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(4);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_outsl);
+
+void dma_insl(const void __iomem *addr, void *buf, unsigned short len)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ bfin_write_MDMA_D0_START_ADDR(buf);
+ bfin_write_MDMA_D0_X_COUNT(len);
+ bfin_write_MDMA_D0_X_MODIFY(4);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_START_ADDR(addr);
+ bfin_write_MDMA_S0_X_COUNT(len);
+ bfin_write_MDMA_S0_X_MODIFY(0);
+ bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
+ bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
+
+ blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
+
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
+
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_CONFIG(0);
+ local_irq_restore(flags);
+
+}
+EXPORT_SYMBOL(dma_insl);
diff --git a/include/asm-blackfin/io.h b/include/asm-blackfin/io.h
index 7e6995e..eac8bca 100644
--- a/include/asm-blackfin/io.h
+++ b/include/asm-blackfin/io.h
@@ -115,13 +115,21 @@ static inline unsigned int readl(void __iomem *addr)

#ifndef __ASSEMBLY__

-extern void outsb(void __iomem *port, const void *addr, unsigned long count);
-extern void outsw(void __iomem *port, const void *addr, unsigned long count);
-extern void outsl(void __iomem *port, const void *addr, unsigned long count);
+extern void outsb(void __iomem *port, const void *addr, unsigned short count);
+extern void outsw(void __iomem *port, const void *addr, unsigned short count);
+extern void outsl(void __iomem *port, const void *addr, unsigned short count);

-extern void insb(const void __iomem *port, void *addr, unsigned long count);
-extern void insw(const void __iomem *port, void *addr, unsigned long count);
-extern void insl(const void __iomem *port, void *addr, unsigned long count);
+extern void insb(const void __iomem *port, void *addr, unsigned short count);
+extern void insw(const void __iomem *port, void *addr, unsigned short count);
+extern void insl(const void __iomem *port, void *addr, unsigned short count);
+
+extern void dma_outsb(void __iomem *port, const void *addr, unsigned short count);
+extern void dma_outsw(void __iomem *port, const void *addr, unsigned short count);
+extern void dma_outsl(void __iomem *port, const void *addr, unsigned short count);
+
+extern void dma_insb(const void __iomem *port, void *addr, unsigned short count);
+extern void dma_insw(const void __iomem *port, void *addr, unsigned short count);
+extern void dma_insl(const void __iomem *port, void *addr, unsigned short count);

/*
* Map some physical address range into the kernel address space.
--
1.5.1.2
-
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