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SubjectPLEASE, REMOVE MY EMAIL ADDRESS FROM ITS LIST.
Em 03-06-2012 16:09, Russell King - ARM Linux escreveu:
> On Sun, Jun 03, 2012 at 08:38:09PM +0200, Roland Stigge wrote:
>> +static int lpc32xx_xmit_dma(struct mtd_info *mtd, dma_addr_t dma,
>> + void *mem, int len, enum dma_transfer_direction dir)
>> +{
>> + struct nand_chip *chip = mtd->priv;
>> + struct lpc32xx_nand_host *host = chip->priv;
>> + struct dma_async_tx_descriptor *desc;
>> + int flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
>> + int res;
>> + dma_cookie_t cookie;
>> +
>> + host->dma_slave_config.direction = dir;
>> + host->dma_slave_config.src_addr = dma;
>> + host->dma_slave_config.dst_addr = dma;
>> + host->dma_slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
>> + host->dma_slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
>> + host->dma_slave_config.src_maxburst = 4;
>> + host->dma_slave_config.dst_maxburst = 4;
>> + /* DMA controller does flow control: */
>> + host->dma_slave_config.device_fc = false;
>> + if (dmaengine_slave_config(host->dma_chan,&host->dma_slave_config)) {
>> + dev_err(mtd->dev.parent, "Failed to setup DMA slave\n");
>> + return -ENXIO;
>> + }
>> +
>> + sg_init_one(&host->sgl, mem, len);
>> +
>> + res = dma_map_sg(host->dma_chan->device->dev,&host->sgl, 1,
>> + DMA_BIDIRECTIONAL);
>> + if (res != 1) {
>> + dev_err(mtd->dev.parent, "Failed to map sg list\n");
>> + return -ENXIO;
>> + }
>> + desc = dmaengine_prep_slave_sg(host->dma_chan,&host->sgl, 1, dir,
>> + flags);
>> + if (!desc) {
>> + dev_err(mtd->dev.parent, "Failed to prepare slave sg\n");
>> + goto out1;
>> + }
>> +
>> + init_completion(&host->comp);
>> + desc->callback = lpc32xx_dma_complete_func;
>> + desc->callback_param =&host->comp;
>> +
>> + cookie = dmaengine_submit(desc);
>> + if (dma_submit_error(cookie)) {
>> + dev_err(mtd->dev.parent, "Failed to dmaengine_submit()\n");
>> + goto out1;
>> + }
> dmaengine_submit() is no longer allowed to fail, so you don't need this
> check here anymore. It's been that way for a long time.
>
>> + dma_async_issue_pending(host->dma_chan);
>> +
>> + wait_for_completion_timeout(&host->comp, msecs_to_jiffies(1000));
> What about unmapping the buffer upon completion?
>
>> +
>> + return 0;
>> +out1:
>> + dma_unmap_sg(host->dma_chan->device->dev,&host->sgl, 1,
>> + DMA_BIDIRECTIONAL);
>> + return -ENXIO;
>> +}
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>



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