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-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 1e97916914ad..76bfe16c09b1 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -55,7 +55,6 @@ enum atmel_mci_state {
55 55
56struct atmel_mci_dma { 56struct atmel_mci_dma {
57#ifdef CONFIG_MMC_ATMELMCI_DMA 57#ifdef CONFIG_MMC_ATMELMCI_DMA
58 struct dma_client client;
59 struct dma_chan *chan; 58 struct dma_chan *chan;
60 struct dma_async_tx_descriptor *data_desc; 59 struct dma_async_tx_descriptor *data_desc;
61#endif 60#endif
@@ -593,10 +592,8 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
593 592
594 /* If we don't have a channel, we can't do DMA */ 593 /* If we don't have a channel, we can't do DMA */
595 chan = host->dma.chan; 594 chan = host->dma.chan;
596 if (chan) { 595 if (chan)
597 dma_chan_get(chan);
598 host->data_chan = chan; 596 host->data_chan = chan;
599 }
600 597
601 if (!chan) 598 if (!chan)
602 return -ENODEV; 599 return -ENODEV;
@@ -1443,60 +1440,6 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
1443 return IRQ_HANDLED; 1440 return IRQ_HANDLED;
1444} 1441}
1445 1442
1446#ifdef CONFIG_MMC_ATMELMCI_DMA
1447
1448static inline struct atmel_mci *
1449dma_client_to_atmel_mci(struct dma_client *client)
1450{
1451 return container_of(client, struct atmel_mci, dma.client);
1452}
1453
1454static enum dma_state_client atmci_dma_event(struct dma_client *client,
1455 struct dma_chan *chan, enum dma_state state)
1456{
1457 struct atmel_mci *host;
1458 enum dma_state_client ret = DMA_NAK;
1459
1460 host = dma_client_to_atmel_mci(client);
1461
1462 switch (state) {
1463 case DMA_RESOURCE_AVAILABLE:
1464 spin_lock_bh(&host->lock);
1465 if (!host->dma.chan) {
1466 host->dma.chan = chan;
1467 ret = DMA_ACK;
1468 }
1469 spin_unlock_bh(&host->lock);
1470
1471 if (ret == DMA_ACK)
1472 dev_info(&host->pdev->dev,
1473 "Using %s for DMA transfers\n",
1474 chan->dev.bus_id);
1475 break;
1476
1477 case DMA_RESOURCE_REMOVED:
1478 spin_lock_bh(&host->lock);
1479 if (host->dma.chan == chan) {
1480 host->dma.chan = NULL;
1481 ret = DMA_ACK;
1482 }
1483 spin_unlock_bh(&host->lock);
1484
1485 if (ret == DMA_ACK)
1486 dev_info(&host->pdev->dev,
1487 "Lost %s, falling back to PIO\n",
1488 chan->dev.bus_id);
1489 break;
1490
1491 default:
1492 break;
1493 }
1494
1495
1496 return ret;
1497}
1498#endif /* CONFIG_MMC_ATMELMCI_DMA */
1499
1500static int __init atmci_init_slot(struct atmel_mci *host, 1443static int __init atmci_init_slot(struct atmel_mci *host,
1501 struct mci_slot_pdata *slot_data, unsigned int id, 1444 struct mci_slot_pdata *slot_data, unsigned int id,
1502 u32 sdc_reg) 1445 u32 sdc_reg)
@@ -1600,6 +1543,18 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
1600 mmc_free_host(slot->mmc); 1543 mmc_free_host(slot->mmc);
1601} 1544}
1602 1545
1546#ifdef CONFIG_MMC_ATMELMCI_DMA
1547static bool filter(struct dma_chan *chan, void *slave)
1548{
1549 struct dw_dma_slave *dws = slave;
1550
1551 if (dws->dma_dev == chan->device->dev)
1552 return true;
1553 else
1554 return false;
1555}
1556#endif
1557
1603static int __init atmci_probe(struct platform_device *pdev) 1558static int __init atmci_probe(struct platform_device *pdev)
1604{ 1559{
1605 struct mci_platform_data *pdata; 1560 struct mci_platform_data *pdata;
@@ -1652,22 +1607,20 @@ static int __init atmci_probe(struct platform_device *pdev)
1652 goto err_request_irq; 1607 goto err_request_irq;
1653 1608
1654#ifdef CONFIG_MMC_ATMELMCI_DMA 1609#ifdef CONFIG_MMC_ATMELMCI_DMA
1655 if (pdata->dma_slave) { 1610 if (pdata->dma_slave.dma_dev) {
1656 struct dma_slave *slave = pdata->dma_slave; 1611 struct dw_dma_slave *dws = &pdata->dma_slave;
1612 dma_cap_mask_t mask;
1657 1613
1658 slave->tx_reg = regs->start + MCI_TDR; 1614 dws->tx_reg = regs->start + MCI_TDR;
1659 slave->rx_reg = regs->start + MCI_RDR; 1615 dws->rx_reg = regs->start + MCI_RDR;
1660 1616
1661 /* Try to grab a DMA channel */ 1617 /* Try to grab a DMA channel */
1662 host->dma.client.event_callback = atmci_dma_event; 1618 dma_cap_zero(mask);
1663 dma_cap_set(DMA_SLAVE, host->dma.client.cap_mask); 1619 dma_cap_set(DMA_SLAVE, mask);
1664 host->dma.client.slave = slave; 1620 host->dma.chan = dma_request_channel(mask, filter, dws);
1665
1666 dma_async_client_register(&host->dma.client);
1667 dma_async_client_chan_request(&host->dma.client);
1668 } else {
1669 dev_notice(&pdev->dev, "DMA not available, using PIO\n");
1670 } 1621 }
1622 if (!host->dma.chan)
1623 dev_notice(&pdev->dev, "DMA not available, using PIO\n");
1671#endif /* CONFIG_MMC_ATMELMCI_DMA */ 1624#endif /* CONFIG_MMC_ATMELMCI_DMA */
1672 1625
1673 platform_set_drvdata(pdev, host); 1626 platform_set_drvdata(pdev, host);
@@ -1699,8 +1652,8 @@ static int __init atmci_probe(struct platform_device *pdev)
1699 1652
1700err_init_slot: 1653err_init_slot:
1701#ifdef CONFIG_MMC_ATMELMCI_DMA 1654#ifdef CONFIG_MMC_ATMELMCI_DMA
1702 if (pdata->dma_slave) 1655 if (host->dma.chan)
1703 dma_async_client_unregister(&host->dma.client); 1656 dma_release_channel(host->dma.chan);
1704#endif 1657#endif
1705 free_irq(irq, host); 1658 free_irq(irq, host);
1706err_request_irq: 1659err_request_irq:
@@ -1731,8 +1684,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
1731 clk_disable(host->mck); 1684 clk_disable(host->mck);
1732 1685
1733#ifdef CONFIG_MMC_ATMELMCI_DMA 1686#ifdef CONFIG_MMC_ATMELMCI_DMA
1734 if (host->dma.client.slave) 1687 if (host->dma.chan)
1735 dma_async_client_unregister(&host->dma.client); 1688 dma_release_channel(host->dma.chan);
1736#endif 1689#endif
1737 1690
1738 free_irq(platform_get_irq(pdev, 0), host); 1691 free_irq(platform_get_irq(pdev, 0), host);
@@ -1761,7 +1714,7 @@ static void __exit atmci_exit(void)
1761 platform_driver_unregister(&atmci_driver); 1714 platform_driver_unregister(&atmci_driver);
1762} 1715}
1763 1716
1764module_init(atmci_init); 1717late_initcall(atmci_init); /* try to load after dma driver when built-in */
1765module_exit(atmci_exit); 1718module_exit(atmci_exit);
1766 1719
1767MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); 1720MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");