Re: [RFC PATCH 2/3] mmc: host: omap_hsmmc: Enable ADMA2

Peter Ujfalusi
2016-05-18T11:07:57Z

On 05/18/16 11:45, Kishon Vijay Abraham I wrote:

> +static int omap_hsmmc_dma_init(struct omap_hsmmc_host *host)
> +{
> + dma_cap_mask_t mask;
> + unsigned int tx_req, rx_req;
> + struct resource *res;
> + struct platform_device *pdev = to_platform_device(host->dev);
> +
> + dma_cap_zero(mask);
> + dma_cap_set(DMA_SLAVE, mask);
> +
> + if (!pdev->dev.of_node) {
> + res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
> + if (!res) {
> + dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
> + return -ENXIO;
> + }
> + tx_req = res->start;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
> + if (!res) {
> + dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
> + return -ENXIO;
> + }
> + rx_req = res->start;
> + }
> +
> + host->rx_chan =
> + dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> + &rx_req, &pdev->dev, "rx");
> +
> + if (!host->rx_chan) {
> + dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> + return -ENXIO;
> + }
> +
> + host->tx_chan =
> + dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> + &tx_req, &pdev->dev, "tx");
> +
> + if (!host->tx_chan) {
> + dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> + return -ENXIO;

upstream moved to use dma_request_chan() so this part needs to be changed.

> + }
> +
> + return 0;
> +}
> +
> +static void omap_hsmmc_dma_exit(struct omap_hsmmc_host *host)
> +{
> + if (host->tx_chan)
> + dma_release_channel(host->tx_chan);
> + if (host->rx_chan)
> + dma_release_channel(host->rx_chan);
> +}
> +
> static int omap_hsmmc_probe(struct platform_device *pdev)
> {
> struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
> @@ -2000,8 +2219,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> struct resource *res;
> int ret, irq;
> const struct of_device_id *match;
> - dma_cap_mask_t mask;
> - unsigned tx_req, rx_req;
> const struct omap_mmc_of_data *data;
> void __iomem *base;
>
> @@ -2114,7 +2331,10 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
> mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
> mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
> - mmc->max_seg_size = mmc->max_req_size;
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + mmc->max_seg_size = ADMA_MAX_LEN;
> + else
> + mmc->max_seg_size = mmc->max_req_size;
>
> mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
> @@ -2130,46 +2350,12 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>
> omap_hsmmc_conf_bus_power(host);
>
> - if (!pdev->dev.of_node) {
> - res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
> - if (!res) {
> - dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> - tx_req = res->start;
> -
> - res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
> - if (!res) {
> - dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> - rx_req = res->start;
> - }
> -
> - dma_cap_zero(mask);
> - dma_cap_set(DMA_SLAVE, mask);
> -
> - host->rx_chan =
> - dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> - &rx_req, &pdev->dev, "rx");
> -
> - if (!host->rx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> - ret = -ENXIO;
> - goto err_irq;
> - }
> -
> - host->tx_chan =
> - dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
> - &tx_req, &pdev->dev, "tx");
> -
> - if (!host->tx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> - ret = -ENXIO;
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + ret = omap_hsmmc_adma_init(host);
> + else
> + ret = omap_hsmmc_dma_init(host);
> + if (ret)
> goto err_irq;
> - }
>
> /* Request IRQ for MMC operations */
> ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
> @@ -2225,11 +2411,11 @@ err_slot_name:
> mmc_remove_host(mmc);
> err_irq:
> device_init_wakeup(&pdev->dev, false);
> - if (host->tx_chan)
> - dma_release_channel(host->tx_chan);
> - if (host->rx_chan)
> - dma_release_channel(host->rx_chan);
> pm_runtime_dont_use_autosuspend(host->dev);
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + omap_hsmmc_adma_exit(host);
> + else
> + omap_hsmmc_dma_exit(host);
> pm_runtime_put_sync(host->dev);
> pm_runtime_disable(host->dev);
> if (host->dbclk)
> @@ -2248,8 +2434,10 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
> pm_runtime_get_sync(host->dev);
> mmc_remove_host(host->mmc);
>
> - dma_release_channel(host->tx_chan);
> - dma_release_channel(host->rx_chan);
> + if (host->pdata->controller_flags & OMAP_HSMMC_USE_ADMA)
> + omap_hsmmc_adma_exit(host);
> + else
> + omap_hsmmc_dma_exit(host);
>
> pm_runtime_dont_use_autosuspend(host->dev);
> pm_runtime_put_sync(host->dev);
> diff --git a/include/linux/platform_data/hsmmc-omap.h b/include/linux/platform_data/hsmmc-omap.h
> index 8e981be..e26013d 100644
> --- a/include/linux/platform_data/hsmmc-omap.h
> +++ b/include/linux/platform_data/hsmmc-omap.h
> @@ -27,6 +27,7 @@
> #define OMAP_HSMMC_SUPPORTS_DUAL_VOLT BIT(0)
> #define OMAP_HSMMC_BROKEN_MULTIBLOCK_READ BIT(1)
> #define OMAP_HSMMC_SWAKEUP_MISSING BIT(2)
> +#define OMAP_HSMMC_USE_ADMA BIT(3)
>
> struct omap_hsmmc_dev_attr {
> u8 flags;
>

--
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