leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

atmel-mci: change use of dma slave interface

Browse Source 
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@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nicolas Ferre 2009-12-14 18:01:30 -08:00 committed by Linus Torvalds
parent bd68e0838f
commit 2635d1ba71
5 changed files with 98 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arch/arm/mach-at91/include/mach/atmel-mci.h Normal file
View File

@ -0,0 +1,24 @@
#ifndef __MACH_ATMEL_MCI_H
#define __MACH_ATMEL_MCI_H
#include <mach/at_hdmac.h>
/**
* struct mci_dma_data - DMA data for MCI interface
*/
struct mci_dma_data {
struct at_dma_slave sdata;
};
/* accessor macros */
#define slave_data_ptr(s) (&(s)->sdata)
#define find_slave_dev(s) ((s)->sdata.dma_dev)
#define setup_dma_addr(s, t, r) do { \
if (s) { \
(s)->sdata.tx_reg = (t); \
(s)->sdata.rx_reg = (r); \
} \
} while (0)
#endif /* __MACH_ATMEL_MCI_H */

18
arch/avr32/mach-at32ap/at32ap700x.c
View File

@ -15,6 +15,8 @@
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/usb/atmel_usba_udc.h>
#include <mach/atmel-mci.h>
#include <linux/atmel-mci.h>
#include <asm/io.h>
@ -1320,7 +1322,7 @@ 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 mci_dma_slave *slave;
u32 pioa_mask;
u32 piob_mask;
@ -1339,13 +1341,17 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
ARRAY_SIZE(atmel_mci0_resource)))
goto fail;
dws->dma_dev = &dw_dmac0_device.dev;
dws->reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
dws->cfg_hi = (DWC_CFGH_SRC_PER(0)
slave = kzalloc(sizeof(struct mci_dma_slave), GFP_KERNEL);
slave->sdata.dma_dev = &dw_dmac0_device.dev;
slave->sdata.reg_width = DW_DMA_SLAVE_WIDTH_32BIT;
slave->sdata.cfg_hi = (DWC_CFGH_SRC_PER(0)
| DWC_CFGH_DST_PER(1));
dws->cfg_lo &= ~(DWC_CFGL_HS_DST_POL
slave->sdata.cfg_lo &= ~(DWC_CFGL_HS_DST_POL
| DWC_CFGL_HS_SRC_POL);
data->dma_slave = slave;
if (platform_device_add_data(pdev, data,
sizeof(struct mci_platform_data)))
goto fail;
@ -1411,6 +1417,8 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
return pdev;
fail:
data->dma_slave = NULL;
kfree(slave);
platform_device_put(pdev);
return NULL;
}

24
arch/avr32/mach-at32ap/include/mach/atmel-mci.h Normal file
View File

@ -0,0 +1,24 @@
#ifndef __MACH_ATMEL_MCI_H
#define __MACH_ATMEL_MCI_H
#include <linux/dw_dmac.h>
/**
* struct mci_dma_data - DMA data for MCI interface
*/
struct mci_dma_data {
struct dw_dma_slave sdata;
};
/* accessor macros */
#define slave_data_ptr(s) (&(s)->sdata)
#define find_slave_dev(s) ((s)->sdata.dma_dev)
#define setup_dma_addr(s, t, r) do { \
if (s) { \
(s)->sdata.tx_reg = (t); \
(s)->sdata.rx_reg = (r); \
} \
} while (0)
#endif /* __MACH_ATMEL_MCI_H */

56
drivers/mmc/host/atmel-mci.c
View File

@ -25,6 +25,8 @@
#include <linux/stat.h>
#include <linux/mmc/host.h>
#include <mach/atmel-mci.h>
#include <linux/atmel-mci.h>
#include <asm/io.h>
@ -1584,14 +1586,43 @@ 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)
{
struct dw_dma_slave *dws = slave;
struct mci_dma_data *sl = slave;
if (dws->dma_dev == chan->device->dev) {
chan->private = dws;
if (sl && find_slave_dev(sl) == chan->device->dev) {
chan->private = slave_data_ptr(sl);
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->dma_slave,
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)
@ -1645,22 +1676,7 @@ 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);

4
include/linux/atmel-mci.h
View File

@ -3,8 +3,6 @@
#define ATMEL_MCI_MAX_NR_SLOTS 2
#include <linux/dw_dmac.h>
/**
* struct mci_slot_pdata - board-specific per-slot configuration
* @bus_width: Number of data lines wired up the slot
@ -34,7 +32,7 @@ struct mci_slot_pdata {
* @slot: Per-slot configuration data.
*/
struct mci_platform_data {
struct dw_dma_slave dma_slave;
struct mci_dma_data *dma_slave;
struct mci_slot_pdata slot[ATMEL_MCI_MAX_NR_SLOTS];
};