s3cmci: Kconfig selection for PIO/DMA/Both

[deliverable/linux.git] / drivers / mmc / host / s3cmci.c

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 7660ac4572e505a83ab5c4da6a748bac03c46cff..0adf31895f2a81842bcf3c238a94d0efa274effd 100644 (file)
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -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;