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path: root/drivers/mmc/host/atmel-mci.c
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Diffstat (limited to 'drivers/mmc/host/atmel-mci.c')
-rw-r--r--drivers/mmc/host/atmel-mci.c103
1 files changed, 28 insertions, 75 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 1e97916914a..76bfe16c09b 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -55,7 +55,6 @@ enum atmel_mci_state {
struct atmel_mci_dma {
#ifdef CONFIG_MMC_ATMELMCI_DMA
- struct dma_client client;
struct dma_chan *chan;
struct dma_async_tx_descriptor *data_desc;
#endif
@@ -593,10 +592,8 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
/* If we don't have a channel, we can't do DMA */
chan = host->dma.chan;
- if (chan) {
- dma_chan_get(chan);
+ if (chan)
host->data_chan = chan;
- }
if (!chan)
return -ENODEV;
@@ -1443,60 +1440,6 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-#ifdef CONFIG_MMC_ATMELMCI_DMA
-
-static inline struct atmel_mci *
-dma_client_to_atmel_mci(struct dma_client *client)
-{
- return container_of(client, struct atmel_mci, dma.client);
-}
-
-static enum dma_state_client atmci_dma_event(struct dma_client *client,
- struct dma_chan *chan, enum dma_state state)
-{
- struct atmel_mci *host;
- enum dma_state_client ret = DMA_NAK;
-
- host = dma_client_to_atmel_mci(client);
-
- switch (state) {
- case DMA_RESOURCE_AVAILABLE:
- spin_lock_bh(&host->lock);
- if (!host->dma.chan) {
- host->dma.chan = chan;
- ret = DMA_ACK;
- }
- spin_unlock_bh(&host->lock);
-
- if (ret == DMA_ACK)
- dev_info(&host->pdev->dev,
- "Using %s for DMA transfers\n",
- chan->dev.bus_id);
- break;
-
- case DMA_RESOURCE_REMOVED:
- spin_lock_bh(&host->lock);
- if (host->dma.chan == chan) {
- host->dma.chan = NULL;
- ret = DMA_ACK;
- }
- spin_unlock_bh(&host->lock);
-
- if (ret == DMA_ACK)
- dev_info(&host->pdev->dev,
- "Lost %s, falling back to PIO\n",
- chan->dev.bus_id);
- break;
-
- default:
- break;
- }
-
-
- return ret;
-}
-#endif /* CONFIG_MMC_ATMELMCI_DMA */
-
static int __init atmci_init_slot(struct atmel_mci *host,
struct mci_slot_pdata *slot_data, unsigned int id,
u32 sdc_reg)
@@ -1600,6 +1543,18 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
mmc_free_host(slot->mmc);
}
+#ifdef CONFIG_MMC_ATMELMCI_DMA
+static bool filter(struct dma_chan *chan, void *slave)
+{
+ struct dw_dma_slave *dws = slave;
+
+ if (dws->dma_dev == chan->device->dev)
+ return true;
+ else
+ return false;
+}
+#endif
+
static int __init atmci_probe(struct platform_device *pdev)
{
struct mci_platform_data *pdata;
@@ -1652,22 +1607,20 @@ static int __init atmci_probe(struct platform_device *pdev)
goto err_request_irq;
#ifdef CONFIG_MMC_ATMELMCI_DMA
- if (pdata->dma_slave) {
- struct dma_slave *slave = pdata->dma_slave;
+ if (pdata->dma_slave.dma_dev) {
+ struct dw_dma_slave *dws = &pdata->dma_slave;
+ dma_cap_mask_t mask;
- slave->tx_reg = regs->start + MCI_TDR;
- slave->rx_reg = regs->start + MCI_RDR;
+ dws->tx_reg = regs->start + MCI_TDR;
+ dws->rx_reg = regs->start + MCI_RDR;
/* Try to grab a DMA channel */
- host->dma.client.event_callback = atmci_dma_event;
- dma_cap_set(DMA_SLAVE, host->dma.client.cap_mask);
- host->dma.client.slave = slave;
-
- dma_async_client_register(&host->dma.client);
- dma_async_client_chan_request(&host->dma.client);
- } else {
- dev_notice(&pdev->dev, "DMA not available, using PIO\n");
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ host->dma.chan = dma_request_channel(mask, filter, dws);
}
+ if (!host->dma.chan)
+ dev_notice(&pdev->dev, "DMA not available, using PIO\n");
#endif /* CONFIG_MMC_ATMELMCI_DMA */
platform_set_drvdata(pdev, host);
@@ -1699,8 +1652,8 @@ static int __init atmci_probe(struct platform_device *pdev)
err_init_slot:
#ifdef CONFIG_MMC_ATMELMCI_DMA
- if (pdata->dma_slave)
- dma_async_client_unregister(&host->dma.client);
+ if (host->dma.chan)
+ dma_release_channel(host->dma.chan);
#endif
free_irq(irq, host);
err_request_irq:
@@ -1731,8 +1684,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
clk_disable(host->mck);
#ifdef CONFIG_MMC_ATMELMCI_DMA
- if (host->dma.client.slave)
- dma_async_client_unregister(&host->dma.client);
+ if (host->dma.chan)
+ dma_release_channel(host->dma.chan);
#endif
free_irq(platform_get_irq(pdev, 0), host);
@@ -1761,7 +1714,7 @@ static void __exit atmci_exit(void)
platform_driver_unregister(&atmci_driver);
}
-module_init(atmci_init);
+late_initcall(atmci_init); /* try to load after dma driver when built-in */
module_exit(atmci_exit);
MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");