Currently, if DMA information isn't passed from platform data, then DMA
will not be used. This patch allows DMA information obtained though Device
Tree to be used as well.
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Chris Ball <c...@laptop.org>
Cc: linux-mmc@vger.kernel.org
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
drivers/mmc/host/mmci.c | 43 +++++++++++++++++++++++++++++++------------
1 file changed, 31 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 372e921..42e8fec 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -298,15 +298,32 @@ static void mmci_init_sg(struct mmci_host *host, struct
mmc_data *data)
* no custom DMA interfaces are supported.
*/
#ifdef CONFIG_DMA_ENGINE
-static void mmci_dma_setup(struct mmci_host *host)
+static void mmci_dma_setup(struct amba_device *dev,
+ struct mmci_host *host)
{
+ struct device_node *np = dev->dev.of_node;
struct mmci_platform_data *plat = host->plat;
const char *rxname, *txname;
dma_cap_mask_t mask;
+ const char *chan_name;
+ int count, i;
+ bool do_tx = false, do_rx = false;
if (!plat || !plat->dma_filter) {
- dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
- return;
+ if (np) {
+ count = of_property_count_strings(np, "dma-names");
+ for (i = 0; i < count; i++) {
+ of_property_read_string_index(np, "dma-names",
+ i, &chan_name);
+ if (strcmp(chan_name, "tx"))
+ do_tx = true;
+ else if (strcmp(chan_name, "rx"))
+ do_rx = true;
+ }
+ } else {
+ dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
+ return;
+ }
}
/* initialize pre request cookie */
@@ -321,19 +338,21 @@ static void mmci_dma_setup(struct mmci_host *host)
* attempt to use it bidirectionally, however if it is
* is specified but cannot be located, DMA will be disabled.
*/
- if (plat->dma_rx_param) {
- host->dma_rx_channel = dma_request_channel(mask,
- plat->dma_filter,
- plat->dma_rx_param);
+ if (plat->dma_rx_param || do_rx) {
+ host->dma_rx_channel = dma_request_slave_channel_compat(mask,
+ (plat) ? plat->dma_filter : NULL,
+ (plat) ? plat->dma_rx_param : NULL,
+ &dev->dev, "rx");
/* E.g if no DMA hardware is present */
if (!host->dma_rx_channel)
dev_err(mmc_dev(host->mmc), "no RX DMA channel\n");
}
- if (plat->dma_tx_param) {
- host->dma_tx_channel = dma_request_channel(mask,
- plat->dma_filter,
- plat->dma_tx_param);
+ if (plat->dma_tx_param || do_tx) {
+ host->dma_tx_channel = dma_request_slave_channel_compat(mask,
+ (plat) ? plat->dma_filter : NULL,
+ (plat) ? plat->dma_tx_param : NULL,
+ &dev->dev, "tx");
if (!host->dma_tx_channel)
dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n");
} else {
@@ -1538,7 +1557,7 @@ static int mmci_probe(struct amba_device *dev,
amba_rev(dev), (unsigned long long)dev->res.start,
dev->irq[0], dev->irq[1]);
- mmci_dma_setup(host);
+ mmci_dma_setup(dev, host);
pm_runtime_set_autosuspend_delay(&dev->dev, 50);
pm_runtime_use_autosuspend(&dev->dev);
--
1.7.10.4
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