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authorManjunathappa, Prakash <prakash.pm@ti.com>2013-03-28 18:42:00 +0530
committerSekhar Nori <nsekhar@ti.com>2013-04-04 16:55:05 +0530
commit7b43da4cfdd5e88157fe83a07cc49919080d3205 (patch)
tree928a0d17db2efe3da349b4b9ebbfe845ed0388aa /drivers/mmc/host
parentc3847a395b7175558f83dfc7b3171775a3d4ecf2 (diff)
downloadvexpress-lsk-7b43da4cfdd5e88157fe83a07cc49919080d3205.tar.gz
mmc: davinci_mmc: add DT support
Adds device tree support for davinci_mmc. Also add binding documentation. As of now tested for non-dma PIO mode and without GPIO card_detect/ write_protect option because of dependencies on EDMA and GPIO module DT support. Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Sekhar Nori <nsekhar@ti.com> Cc: linux-mmc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: davinci-linux-open-source@linux.davincidsp.com Cc: devicetree-discuss@lists.ozlabs.org Cc: cjb@laptop.org Cc: Sekhar Nori <nsekhar@ti.com> Cc: mporter@ti.com Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Chris Ball <cjb@laptop.org> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/davinci_mmc.c70
1 files changed, 66 insertions, 4 deletions
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index b5f1c019eca..f8a96d652e9 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -34,6 +34,8 @@
#include <linux/dma-mapping.h>
#include <linux/edma.h>
#include <linux/mmc/mmc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_data/mmc-davinci.h>
@@ -522,14 +524,16 @@ static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host)
dma_cap_set(DMA_SLAVE, mask);
host->dma_tx =
- dma_request_channel(mask, edma_filter_fn, &host->txdma);
+ dma_request_slave_channel_compat(mask, edma_filter_fn,
+ &host->txdma, mmc_dev(host->mmc), "tx");
if (!host->dma_tx) {
dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
return -ENODEV;
}
host->dma_rx =
- dma_request_channel(mask, edma_filter_fn, &host->rxdma);
+ dma_request_slave_channel_compat(mask, edma_filter_fn,
+ &host->rxdma, mmc_dev(host->mmc), "rx");
if (!host->dma_rx) {
dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
r = -ENODEV;
@@ -1169,9 +1173,62 @@ static struct platform_device_id davinci_mmc_devtype[] = {
};
MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
-static int __init davinci_mmcsd_probe(struct platform_device *pdev)
+static const struct of_device_id davinci_mmc_dt_ids[] = {
+ {
+ .compatible = "ti,dm6441-mmc",
+ .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
+ },
+ {
+ .compatible = "ti,da830-mmc",
+ .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
+
+static struct davinci_mmc_config
+ *mmc_parse_pdata(struct platform_device *pdev)
{
+ struct device_node *np;
struct davinci_mmc_config *pdata = pdev->dev.platform_data;
+ const struct of_device_id *match =
+ of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev);
+ u32 data;
+
+ np = pdev->dev.of_node;
+ if (!np)
+ return pdata;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
+ goto nodata;
+ }
+
+ if (match)
+ pdev->id_entry = match->data;
+
+ if (of_property_read_u32(np, "max-frequency", &pdata->max_freq))
+ dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
+
+ of_property_read_u32(np, "bus-width", &data);
+ switch (data) {
+ case 1:
+ case 4:
+ case 8:
+ pdata->wires = data;
+ break;
+ default:
+ pdata->wires = 1;
+ dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
+ }
+nodata:
+ return pdata;
+}
+
+static int __init davinci_mmcsd_probe(struct platform_device *pdev)
+{
+ struct davinci_mmc_config *pdata = NULL;
struct mmc_davinci_host *host = NULL;
struct mmc_host *mmc = NULL;
struct resource *r, *mem = NULL;
@@ -1179,7 +1236,11 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
size_t mem_size;
const struct platform_device_id *id_entry;
- /* REVISIT: when we're fully converted, fail if pdata is NULL */
+ pdata = mmc_parse_pdata(pdev);
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Couldn't get platform data\n");
+ return -ENOENT;
+ }
ret = -ENODEV;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1421,6 +1482,7 @@ static struct platform_driver davinci_mmcsd_driver = {
.name = "davinci_mmc",
.owner = THIS_MODULE,
.pm = davinci_mmcsd_pm_ops,
+ .of_match_table = of_match_ptr(davinci_mmc_dt_ids),
},
.remove = __exit_p(davinci_mmcsd_remove),
.id_table = davinci_mmc_devtype,