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mmc: atmel-mci: fix burst/chunk size modification
The use of DMA slave config operation requires that the burst size (aka chunk size) is specified through this interface. Modify atmel-mci slave driver to use this specification on its side. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -140,4 +140,18 @@
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#define atmci_writel(port,reg,value) \
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__raw_writel((value), (port)->regs + reg)
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/*
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* Fix sconfig's burst size according to atmel MCI. We need to convert them as:
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* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
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*
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* This can be done by finding most significant bit set.
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*/
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static inline unsigned int atmci_convert_chksize(unsigned int maxburst)
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{
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if (maxburst > 1)
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return fls(maxburst) - 2;
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else
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return 0;
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}
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#endif /* __DRIVERS_MMC_ATMEL_MCI_H__ */
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@ -910,6 +910,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
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enum dma_data_direction direction;
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enum dma_transfer_direction slave_dirn;
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unsigned int sglen;
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u32 maxburst;
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u32 iflags;
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data->error = -EINPROGRESS;
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@ -943,17 +944,18 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
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if (!chan)
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return -ENODEV;
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if (host->caps.has_dma)
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atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
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if (data->flags & MMC_DATA_READ) {
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direction = DMA_FROM_DEVICE;
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host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
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maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
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} else {
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direction = DMA_TO_DEVICE;
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host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
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maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
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}
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atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) | ATMCI_DMAEN);
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sglen = dma_map_sg(chan->device->dev, data->sg,
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data->sg_len, direction);
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