lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

s3cmci: Kconfig selection for PIO/DMA/Both

Browse Source 
Add a selection for the data transfer mode of the s3cmci driver, allowing
for either a configuration or rumtime selection of the use of the DMA or
PIO transfer code.

The PIO only mode is 476 bytes smaller than the driver with both methods
compiled in.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
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:
Ben Dooks
2009-10-01 15:44:18 -07:00
committed by Linus Torvalds
parent c225889375
commit 26f14947db
3 changed files with 66 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/mmc/host/s3cmci.c
View File

@@ -164,6 +164,25 @@ static void dbg_dumpregs(struct s3cmci_host *host, char *prefix) { }
#endif /* CONFIG_MMC_DEBUG */
/**
* s3cmci_host_usedma - return whether the host is using dma or pio
* @host: The host state
*
* Return true if the host is using DMA to transfer data, else false
* to use PIO mode. Will return static data depending on the driver
* configuration.
*/
static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
{
#ifdef CONFIG_MMC_S3C_PIO
return false;
#elif defined(CONFIG_MMC_S3C_DMA)
return true;
#else
return host->dodma;
#endif
}
static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
{
u32 newmask;
@@ -560,7 +579,7 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
goto irq_out;
}
if (!host->dodma) {
if (!s3cmci_host_usedma(host)) {
if ((host->pio_active == XFER_WRITE) &&
(mci_fsta & S3C2410_SDIFSTA_TFDET)) {
@@ -796,7 +815,7 @@ static void finalize_request(struct s3cmci_host *host)
if (cmd->data && (cmd->error == 0) &&
(cmd->data->error == 0)) {
if (host->dodma && (!host->dma_complete)) {
if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
dbg(host, dbg_dma, "DMA Missing!\n");
return;
}
@@ -848,7 +867,7 @@ static void finalize_request(struct s3cmci_host *host)
/* If we had an error while transfering data we flush the
* DMA channel and the fifo to clear out any garbage. */
if (mrq->data->error != 0) {
if (host->dodma)
if (s3cmci_host_usedma(host))
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
if (host->is2440) {
@@ -968,7 +987,7 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
if (host->dodma)
if (s3cmci_host_usedma(host))
dcon |= S3C2410_SDIDCON_DMAEN;
if (host->bus_width == MMC_BUS_WIDTH_4)
@@ -1114,7 +1133,7 @@ static void s3cmci_send_request(struct mmc_host *mmc)
return;
}
if (host->dodma)
if (s3cmci_host_usedma(host))
res = s3cmci_prepare_dma(host, cmd->data);
else
res = s3cmci_prepare_pio(host, cmd->data);
@@ -1398,7 +1417,7 @@ static int s3cmci_state_show(struct seq_file *seq, void *v)
seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
seq_printf(seq, "IRQ state = %d\n", host->irq_state);
seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
seq_printf(seq, "Do DMA = %d\n", host->dodma);
seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
@@ -1559,12 +1578,15 @@ static int __devinit s3cmci_probe(struct platform_device *pdev)
host->clk_div = 2;
}
host->dodma = 0;
host->complete_what = COMPLETION_NONE;
host->pio_active = XFER_NONE;
host->dma = S3CMCI_DMA;
#ifdef CONFIG_MMC_S3C_PIODMA
host->dodma = host->pdata->dma;
#endif
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!host->mem) {
dev_err(&pdev->dev,
@@ -1702,7 +1724,8 @@ static int __devinit s3cmci_probe(struct platform_device *pdev)
s3cmci_debugfs_attach(host);
platform_set_drvdata(pdev, mmc);
dev_info(&pdev->dev, "initialisation done.\n");
dev_info(&pdev->dev, "%s - using %s\n", mmc_hostname(mmc),
s3cmci_host_usedma(host) ? "dma" : "pio");
return 0;