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Date: Thu, 17 Sep 2009 18:29:26 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: linux-mmc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, haavard.skinnemoen@...el.com,
kernel@...32linux.org, Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [PATCH 1/2] atmel-mci: change use of dma slave interface
Allow the use of another DMA controller driver in atmel-mci sd/mmc driver. This
adds a generic dma_slave pointer to the mci platform structure where we can
store DMA controller information. In atmel-mci we use information provided by
this structure to initialize the driver (with new helper functions that are
architecture dependant).
This also adds at32/avr32 chip modifications to cope with this new access
method.
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
arch/avr32/mach-at32ap/at32ap700x.c | 6 ++-
drivers/mmc/host/atmel-mci.c | 82 ++++++++++++++++++++++++++---------
include/linux/atmel-mci.h | 3 +-
3 files changed, 68 insertions(+), 23 deletions(-)
diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index eb9d4dc..d1fe145 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1320,7 +1320,7 @@ struct platform_device *__init
at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
{
struct platform_device *pdev;
- struct dw_dma_slave *dws = &data->dma_slave;
+ struct dw_dma_slave *dws;
u32 pioa_mask;
u32 piob_mask;
@@ -1339,6 +1339,8 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
ARRAY_SIZE(atmel_mci0_resource)))
goto fail;
+ dws = kzalloc(sizeof(struct dw_dma_slave), GFP_KERNEL);
+
dws->dma_dev = &dw_dmac0_device.dev;
dws->reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
dws->cfg_hi = (DWC_CFGH_SRC_PER(0)
@@ -1346,6 +1348,8 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
dws->cfg_lo &= ~(DWC_CFGL_HS_DST_POL
| DWC_CFGL_HS_SRC_POL);
+ data->dma_slave = dws;
+
if (platform_device_add_data(pdev, data,
sizeof(struct mci_platform_data)))
goto fail;
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 065fa81..1689396 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1575,16 +1575,71 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
}
#ifdef CONFIG_MMC_ATMELMCI_DMA
-static bool filter(struct dma_chan *chan, void *slave)
+static struct device *find_slave_dev(void *slave)
+{
+ if (!slave)
+ return NULL;
+
+ if (cpu_is_at32ap7000())
+ return ((struct dw_dma_slave *)slave)->dma_dev;
+ else
+ return ((struct at_dma_slave *)slave)->dma_dev;
+}
+
+static void setup_dma_addr(struct mci_platform_data *pdata,
+ dma_addr_t tx_addr, dma_addr_t rx_addr)
{
- struct dw_dma_slave *dws = slave;
+ if (!pdata)
+ return;
+
+ if (cpu_is_at32ap7000()) {
+ struct dw_dma_slave *dws = pdata->dma_slave;
+
+ dws->tx_reg = tx_addr;
+ dws->rx_reg = rx_addr;
+ } else {
+ struct at_dma_slave *ats = pdata->dma_slave;
- if (dws->dma_dev == chan->device->dev) {
- chan->private = dws;
+ ats->tx_reg = tx_addr;
+ ats->rx_reg = rx_addr;
+ }
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+ if (find_slave_dev(slave) == chan->device->dev) {
+ chan->private = slave;
return true;
- } else
+ } else {
return false;
+ }
+}
+
+static void atmci_configure_dma(struct atmel_mci *host)
+{
+ struct mci_platform_data *pdata;
+
+ if (host == NULL)
+ return;
+
+ pdata = host->pdev->dev.platform_data;
+
+ if (pdata && find_slave_dev(pdata->dma_slave)) {
+ dma_cap_mask_t mask;
+
+ setup_dma_addr(pdata, host->mapbase + MCI_TDR,
+ host->mapbase + MCI_RDR);
+
+ /* Try to grab a DMA channel */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ host->dma.chan = dma_request_channel(mask, filter, pdata->dma_slave);
+ }
+ if (!host->dma.chan)
+ dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
}
+#else
+static void atmci_configure_dma(struct atmel_mci *host) {}
#endif
static int __init atmci_probe(struct platform_device *pdev)
@@ -1638,22 +1693,7 @@ static int __init atmci_probe(struct platform_device *pdev)
if (ret)
goto err_request_irq;
-#ifdef CONFIG_MMC_ATMELMCI_DMA
- if (pdata->dma_slave.dma_dev) {
- struct dw_dma_slave *dws = &pdata->dma_slave;
- dma_cap_mask_t mask;
-
- dws->tx_reg = regs->start + MCI_TDR;
- dws->rx_reg = regs->start + MCI_RDR;
-
- /* Try to grab a DMA channel */
- 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 */
+ atmci_configure_dma(host);
platform_set_drvdata(pdev, host);
diff --git a/include/linux/atmel-mci.h b/include/linux/atmel-mci.h
index 57b1846..e26b7de 100644
--- a/include/linux/atmel-mci.h
+++ b/include/linux/atmel-mci.h
@@ -4,6 +4,7 @@
#define ATMEL_MCI_MAX_NR_SLOTS 2
#include <linux/dw_dmac.h>
+#include <mach/at_hdmac.h>
/**
* struct mci_slot_pdata - board-specific per-slot configuration
@@ -34,7 +35,7 @@ struct mci_slot_pdata {
* @slot: Per-slot configuration data.
*/
struct mci_platform_data {
- struct dw_dma_slave dma_slave;
+ void *dma_slave;
struct mci_slot_pdata slot[ATMEL_MCI_MAX_NR_SLOTS];
};
--
1.5.6.5
--
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