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authorDan Williams <dan.j.williams@intel.com>2009-01-06 11:38:16 -0700
committerDan Williams <dan.j.williams@intel.com>2009-01-06 11:38:16 -0700
commit74465b4ff9ac1da503025c0a0042e023bfa6505c (patch)
treece63f4a4b055b65cae1edaddd334931bf512c76e /drivers/mmc
parent33df8ca068123457db56c316946a3c0e4ef787d6 (diff)
atmel-mci: convert to dma_request_channel and down-level dma_slave
dma_request_channel provides an exclusive channel, so we no longer need to pass slave data through dmaengine. Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/atmel-mci.c98
1 files changed, 27 insertions, 71 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 6c11f4d4c4e..7a34118507d 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1441,60 +1441,6 @@ 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)
@@ -1598,6 +1544,18 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
mmc_free_host(slot->mmc);
}
+#ifdef CONFIG_MMC_ATMELMCI_DMA
+static enum dma_state_client filter(struct dma_chan *chan, void *slave)
+{
+ struct dw_dma_slave *dws = slave;
+
+ if (dws->dma_dev == chan->device->dev)
+ return DMA_ACK;
+ else
+ return DMA_DUP;
+}
+#endif
+
static int __init atmci_probe(struct platform_device *pdev)
{
struct mci_platform_data *pdata;
@@ -1650,22 +1608,20 @@ 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);
@@ -1697,8 +1653,8 @@ 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:
@@ -1729,8 +1685,8 @@ 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);
@@ -1759,7 +1715,7 @@ 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");