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path: root/drivers/mmc/host/atmel-mci.c
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Diffstat (limited to 'drivers/mmc/host/atmel-mci.c')
-rw-r--r--drivers/mmc/host/atmel-mci.c141
1 files changed, 111 insertions, 30 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index fc25586b7ee1..8072128e933b 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -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>
@@ -92,6 +94,7 @@ struct atmel_mci_dma {
* @need_clock_update: Update the clock rate before the next request.
* @need_reset: Reset controller before next request.
* @mode_reg: Value of the MR register.
+ * @cfg_reg: Value of the CFG register.
* @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
* rate and timeout calculations.
* @mapbase: Physical address of the MMIO registers.
@@ -155,6 +158,7 @@ struct atmel_mci {
bool need_clock_update;
bool need_reset;
u32 mode_reg;
+ u32 cfg_reg;
unsigned long bus_hz;
unsigned long mapbase;
struct clk *mck;
@@ -223,6 +227,19 @@ static bool mci_has_rwproof(void)
}
/*
+ * The new MCI2 module isn't 100% compatible with the old MCI module,
+ * and it has a few nice features which we want to use...
+ */
+static inline bool atmci_is_mci2(void)
+{
+ if (cpu_is_at91sam9g45())
+ return true;
+
+ return false;
+}
+
+
+/*
* The debugfs stuff below is mostly optimized away when
* CONFIG_DEBUG_FS is not set.
*/
@@ -357,12 +374,33 @@ static int atmci_regs_show(struct seq_file *s, void *v)
buf[MCI_BLKR / 4],
buf[MCI_BLKR / 4] & 0xffff,
(buf[MCI_BLKR / 4] >> 16) & 0xffff);
+ if (atmci_is_mci2())
+ seq_printf(s, "CSTOR:\t0x%08x\n", buf[MCI_CSTOR / 4]);
/* Don't read RSPR and RDR; it will consume the data there */
atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]);
atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]);
+ if (atmci_is_mci2()) {
+ u32 val;
+
+ val = buf[MCI_DMA / 4];
+ seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
+ val, val & 3,
+ ((val >> 4) & 3) ?
+ 1 << (((val >> 4) & 3) + 1) : 1,
+ val & MCI_DMAEN ? " DMAEN" : "");
+
+ val = buf[MCI_CFG / 4];
+ seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
+ val,
+ val & MCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
+ val & MCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
+ val & MCI_CFG_HSMODE ? " HSMODE" : "",
+ val & MCI_CFG_LSYNC ? " LSYNC" : "");
+ }
+
kfree(buf);
return 0;
@@ -557,6 +595,10 @@ static void atmci_dma_complete(void *arg)
dev_vdbg(&host->pdev->dev, "DMA complete\n");
+ if (atmci_is_mci2())
+ /* Disable DMA hardware handshaking on MCI */
+ mci_writel(host, DMA, mci_readl(host, DMA) & ~MCI_DMAEN);
+
atmci_dma_cleanup(host);
/*
@@ -592,7 +634,7 @@ static void atmci_dma_complete(void *arg)
}
static int
-atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
+atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
{
struct dma_chan *chan;
struct dma_async_tx_descriptor *desc;
@@ -624,6 +666,9 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
if (!chan)
return -ENODEV;
+ if (atmci_is_mci2())
+ mci_writel(host, DMA, MCI_DMA_CHKSIZE(3) | MCI_DMAEN);
+
if (data->flags & MMC_DATA_READ)
direction = DMA_FROM_DEVICE;
else
@@ -641,10 +686,6 @@ atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
host->dma.data_desc = desc;
desc->callback = atmci_dma_complete;
desc->callback_param = host;
- desc->tx_submit(desc);
-
- /* Go! */
- chan->device->device_issue_pending(chan);
return 0;
unmap_exit:
@@ -652,13 +693,26 @@ unmap_exit:
return -ENOMEM;
}
+static void atmci_submit_data(struct atmel_mci *host)
+{
+ struct dma_chan *chan = host->data_chan;
+ struct dma_async_tx_descriptor *desc = host->dma.data_desc;
+
+ if (chan) {
+ desc->tx_submit(desc);
+ chan->device->device_issue_pending(chan);
+ }
+}
+
#else /* CONFIG_MMC_ATMELMCI_DMA */
-static int atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
+static int atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
{
return -ENOSYS;
}
+static void atmci_submit_data(struct atmel_mci *host) {}
+
static void atmci_stop_dma(struct atmel_mci *host)
{
/* Data transfer was stopped by the interrupt handler */
@@ -672,7 +726,7 @@ static void atmci_stop_dma(struct atmel_mci *host)
* Returns a mask of interrupt flags to be enabled after the whole
* request has been prepared.
*/
-static u32 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
+static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
{
u32 iflags;
@@ -683,7 +737,7 @@ static u32 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
host->data = data;
iflags = ATMCI_DATA_ERROR_FLAGS;
- if (atmci_submit_data_dma(host, data)) {
+ if (atmci_prepare_data_dma(host, data)) {
host->data_chan = NULL;
/*
@@ -729,6 +783,8 @@ static void atmci_start_request(struct atmel_mci *host,
mci_writel(host, CR, MCI_CR_SWRST);
mci_writel(host, CR, MCI_CR_MCIEN);
mci_writel(host, MR, host->mode_reg);
+ if (atmci_is_mci2())
+ mci_writel(host, CFG, host->cfg_reg);
host->need_reset = false;
}
mci_writel(host, SDCR, slot->sdc_reg);
@@ -744,6 +800,7 @@ static void atmci_start_request(struct atmel_mci *host,
while (!(mci_readl(host, SR) & MCI_CMDRDY))
cpu_relax();
}
+ iflags = 0;
data = mrq->data;
if (data) {
atmci_set_timeout(host, slot, data);
@@ -753,15 +810,17 @@ static void atmci_start_request(struct atmel_mci *host,
| MCI_BLKLEN(data->blksz));
dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz));
+
+ iflags |= atmci_prepare_data(host, data);
}
- iflags = MCI_CMDRDY;
+ iflags |= MCI_CMDRDY;
cmd = mrq->cmd;
cmdflags = atmci_prepare_command(slot->mmc, cmd);
atmci_start_command(host, cmd, cmdflags);
if (data)
- iflags |= atmci_submit_data(host, data);
+ atmci_submit_data(host);
if (mrq->stop) {
host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
@@ -857,6 +916,8 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
clk_enable(host->mck);
mci_writel(host, CR, MCI_CR_SWRST);
mci_writel(host, CR, MCI_CR_MCIEN);
+ if (atmci_is_mci2())
+ mci_writel(host, CFG, host->cfg_reg);
}
/*
@@ -1095,6 +1156,8 @@ static void atmci_detect_change(unsigned long data)
mci_writel(host, CR, MCI_CR_SWRST);
mci_writel(host, CR, MCI_CR_MCIEN);
mci_writel(host, MR, host->mode_reg);
+ if (atmci_is_mci2())
+ mci_writel(host, CFG, host->cfg_reg);
host->data = NULL;
host->cmd = NULL;
@@ -1584,14 +1647,47 @@ 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
+ dev_info(&host->pdev->dev,
+ "Using %s for DMA transfers\n",
+ dma_chan_name(host->dma.chan));
+}
+#else
+static void atmci_configure_dma(struct atmel_mci *host) {}
#endif
static int __init atmci_probe(struct platform_device *pdev)
@@ -1645,22 +1741,7 @@ 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);