linux-kernel - [PATCH RFC 2/3] mmc: sdhci-omap: Add using external dma

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Message-Id: <1541387810-24867-3-git-send-email-zhang.chunyan@linaro.org>
Date:   Mon,  5 Nov 2018 11:16:49 +0800
From:   Chunyan Zhang <zhang.chunyan@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Sekhar Nori <nsekhar@...com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH RFC 2/3] mmc: sdhci-omap: Add using external dma

sdhci-omap can support both external dma controllers via dmaengine
framework as well as ADMA in which the controller acts as DMA master.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 drivers/mmc/host/sdhci-omap.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 88347ce..0a8162c 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -896,6 +896,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	struct sdhci_omap_data *data;
 	const struct soc_device_attribute *soc;
+	struct resource *regs;
 
 	match = of_match_device(omap_sdhci_match, dev);
 	if (!match)
@@ -908,6 +909,10 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 	}
 	offset = data->offset;
 
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs)
+		return -ENXIO;
+
 	host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
 				sizeof(*omap_host));
 	if (IS_ERR(host)) {
@@ -924,6 +929,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 	omap_host->timing = MMC_TIMING_LEGACY;
 	omap_host->flags = data->flags;
 	host->ioaddr += offset;
+	host->mapbase = regs->start;
 
 	mmc = host->mmc;
 	sdhci_get_of_property(pdev);
@@ -991,6 +997,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 	host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
 	host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;
 
+	sdhci_switch_extdma(host, true);
 	ret = sdhci_setup_host(host);
 	if (ret)
 		goto err_put_sync;
-- 
2.7.4