[PATCH v2 4/8] mmc: atmel-mci: add pdc support and runtime capabilities detection
ludovic.desroches at atmel.com
ludovic.desroches at atmel.com
Thu Aug 11 11:25:44 EDT 2011
From: Ludovic Desroches <ludovic.desroches at atmel.com>
Add the pdc support for atmel-mci. It makes at91-mci driver useless because
it was only used for the old atmel MCI core which has pdc but no dma support.
To allow removing at91-mci, the capabilites of the MCI core is detected at
runtime, then the driver will use pio, pdc or dma transfers.
Warning: at91rm9200 is not supported, to support it we need to use swab32 on
data but I have no board to test it.
Signed-off-by: Ludovic Desroches <ludovic.desroches at atmel.com>
---
drivers/mmc/host/atmel-mci-regs.h | 14 +
drivers/mmc/host/atmel-mci.c | 528 ++++++++++++++++++++++++++++--------
2 files changed, 424 insertions(+), 118 deletions(-)
diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index 7310b20..6dd2826 100644
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -88,8 +88,14 @@
# define ATMCI_BLKE ( 1 << 3) /* Data Block Ended */
# define ATMCI_DTIP ( 1 << 4) /* Data Transfer In Progress */
# define ATMCI_NOTBUSY ( 1 << 5) /* Data Not Busy */
+# define ATMCI_ENDRX ( 1 << 6) /* End of RX Buffer */
+# define ATMCI_ENDTX ( 1 << 7) /* End of TX Buffer */
# define ATMCI_SDIOIRQA ( 1 << 8) /* SDIO IRQ in slot A */
# define ATMCI_SDIOIRQB ( 1 << 9) /* SDIO IRQ in slot B */
+# define ATMCI_SDIOWAIT ( 1 << 12) /* SDIO Read Wait Operation Status */
+# define ATMCI_CSRCV ( 1 << 13) /* CE-ATA Completion Signal Received */
+# define ATMCI_RXBUFF ( 1 << 14) /* RX Buffer Full */
+# define ATMCI_TXBUFE ( 1 << 15) /* TX Buffer Empty */
# define ATMCI_RINDE ( 1 << 16) /* Response Index Error */
# define ATMCI_RDIRE ( 1 << 17) /* Response Direction Error */
# define ATMCI_RCRCE ( 1 << 18) /* Response CRC Error */
@@ -97,6 +103,13 @@
# define ATMCI_RTOE ( 1 << 20) /* Response Time-Out Error */
# define ATMCI_DCRCE ( 1 << 21) /* Data CRC Error */
# define ATMCI_DTOE ( 1 << 22) /* Data Time-Out Error */
+# define ATMCI_CSTOE ( 1 << 23) /* Completion Signql Time-out Error */
+# define ATMCI_BLKOVRE ( 1 << 24) /* DMA Block Overrun Error */
+# define ATMCI_DMADONE ( 1 << 25) /* DMA Transfer Done */
+# define ATMCI_FIFOEMPTY ( 1 << 26) /* FIFO Empty Flag */
+# define ATMCI_XFRDONE ( 1 << 27) /* Transfer Done Flag */
+# define ATMCI_ACKRCV ( 1 << 28) /* Boot Operation Acknowledge Received */
+# define ATMCI_ACKRCVE ( 1 << 29) /* Boot Operation Acknowledge Error */
# define ATMCI_OVRE ( 1 << 30) /* RX Overrun Error */
# define ATMCI_UNRE ( 1 << 31) /* TX Underrun Error */
#define ATMCI_DMA 0x0050 /* DMA Configuration[2] */
@@ -114,6 +127,7 @@
#define ATMCI_WPSR 0x00e8 /* Write Protection Status[2] */
# define ATMCI_GET_WP_VS(x) ((x) & 0x0f)
# define ATMCI_GET_WP_VSRC(x) (((x) >> 8) & 0xffff)
+#define ATMCI_VERSION 0x00FC /* Version */
#define ATMCI_FIFO_APERTURE 0x0200 /* FIFO Aperture[2] */
/* This is not including the FIFO Aperture on MCI2 */
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 87eeccc..efbee87 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -30,6 +30,7 @@
#include <mach/atmel-mci.h>
#include <linux/atmel-mci.h>
+#include <linux/atmel_pdc.h>
#include <asm/io.h>
#include <asm/unaligned.h>
@@ -58,18 +59,35 @@ enum atmel_mci_state {
STATE_DATA_ERROR,
};
+enum atmci_xfer_dir {
+ XFER_RECEIVE = 0,
+ XFER_TRANSMIT,
+};
+
+enum atmci_pdc_buf {
+ PDC_FIRST_BUF = 0,
+ PDC_SECOND_BUF,
+};
+
+struct atmel_mci_caps {
+ bool has_dma;
+ bool has_pdc;
+ bool has_cfg_reg;
+ bool has_cstor_reg;
+ bool has_highspeed;
+ bool has_rwproof;
+};
+
struct atmel_mci_dma {
-#ifdef CONFIG_MMC_ATMELMCI_DMA
struct dma_chan *chan;
struct dma_async_tx_descriptor *data_desc;
-#endif
};
/**
* struct atmel_mci - MMC controller state shared between all slots
* @lock: Spinlock protecting the queue and associated data.
* @regs: Pointer to MMIO registers.
- * @sg: Scatterlist entry currently being processed by PIO code, if any.
+ * @sg: Scatterlist entry currently being processed by PIO or PDC code.
* @pio_offset: Offset into the current scatterlist entry.
* @cur_slot: The slot which is currently using the controller.
* @mrq: The request currently being processed on @cur_slot,
@@ -77,6 +95,7 @@ struct atmel_mci_dma {
* @cmd: The command currently being sent to the card, or NULL.
* @data: The data currently being transferred, or NULL if no data
* transfer is in progress.
+ * @data_size: just data->blocks * data->blksz.
* @dma: DMA client state.
* @data_chan: DMA channel being used for the current data transfer.
* @cmd_status: Snapshot of SR taken upon completion of the current
@@ -103,6 +122,13 @@ struct atmel_mci_dma {
* @mck: The peripheral bus clock hooked up to the MMC controller.
* @pdev: Platform device associated with the MMC controller.
* @slot: Slots sharing this MMC controller.
+ * @caps: MCI capabilities depending on MCI version.
+ * @prepare_data: function to setup MCI before data transfer which
+ * depends on MCI capabilities.
+ * @submit_data: function to start data transfer which depends on MCI
+ * capabilities.
+ * @stop_transfer: function to stop data transfer which depends on MCI
+ * capabilities.
*
* Locking
* =======
@@ -143,6 +169,7 @@ struct atmel_mci {
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
+ unsigned int data_size;
struct atmel_mci_dma dma;
struct dma_chan *data_chan;
@@ -167,6 +194,12 @@ struct atmel_mci {
struct platform_device *pdev;
struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS];
+
+ struct atmel_mci_caps caps;
+
+ u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
+ void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
+ void (*stop_transfer)(struct atmel_mci *host);
};
/**
@@ -220,31 +253,6 @@ struct atmel_mci_slot {
set_bit(event, &host->pending_events)
/*
- * Enable or disable features/registers based on
- * whether the processor supports them
- */
-static bool atmci_has_rwproof(void)
-{
- if (cpu_is_at91sam9261() || cpu_is_at91rm9200())
- return false;
- else
- return true;
-}
-
-/*
- * 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.
*/
@@ -379,7 +387,7 @@ static int atmci_regs_show(struct seq_file *s, void *v)
buf[ATMCI_BLKR / 4],
buf[ATMCI_BLKR / 4] & 0xffff,
(buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
- if (atmci_is_mci2())
+ if (host->caps.has_cstor_reg)
seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
/* Don't read RSPR and RDR; it will consume the data there */
@@ -387,7 +395,7 @@ static int atmci_regs_show(struct seq_file *s, void *v)
atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
- if (atmci_is_mci2()) {
+ if (host->caps.has_dma) {
u32 val;
val = buf[ATMCI_DMA / 4];
@@ -396,6 +404,9 @@ static int atmci_regs_show(struct seq_file *s, void *v)
((val >> 4) & 3) ?
1 << (((val >> 4) & 3) + 1) : 1,
val & ATMCI_DMAEN ? " DMAEN" : "");
+ }
+ if (host->caps.has_cfg_reg) {
+ u32 val;
val = buf[ATMCI_CFG / 4];
seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
@@ -574,33 +585,109 @@ static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
}
-#ifdef CONFIG_MMC_ATMELMCI_DMA
-static void atmci_dma_cleanup(struct atmel_mci *host)
+/*
+ * Configure given PDC buffer taking care of alignement issues.
+ * Update host->data_size and host->sg.
+ */
+static void atmci_pdc_set_single_buf(struct atmel_mci *host,
+ enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
+{
+ u32 pointer_reg, counter_reg;
+
+ if (dir == XFER_RECEIVE) {
+ pointer_reg = ATMEL_PDC_RPR;
+ counter_reg = ATMEL_PDC_RCR;
+ } else {
+ pointer_reg = ATMEL_PDC_TPR;
+ counter_reg = ATMEL_PDC_TCR;
+ }
+
+ if (buf_nb == PDC_SECOND_BUF) {
+ pointer_reg += 0x10;
+ counter_reg += 0x10;
+ }
+
+ atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
+ if (host->data_size <= PAGE_SIZE) {
+ if (host->data_size & 0x3) {
+ /* If size is different from modulo 4, transfer bytes */
+ atmci_writel(host, counter_reg, host->data_size);
+ atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
+ } else {
+ /* Else transfer 32-bits words */
+ atmci_writel(host, counter_reg, host->data_size / 4);
+ }
+ host->data_size = 0;
+ } else {
+ /* We assume the size of a page is 32-bits aligned */
+ atmci_writel(host, counter_reg, PAGE_SIZE / 4);
+ host->data_size -= PAGE_SIZE;
+ if (host->data_size)
+ host->sg = sg_next(host->sg);
+ }
+}
+
+/*
+ * Configure PDC buffer according to the data size ie configuring one or two
+ * buffers. Don't use this function if you want to configure only the second
+ * buffer. In this case, use atmci_pdc_set_single_buf.
+ */
+static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
{
- struct mmc_data *data = host->data;
+ atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
+ if (host->data_size)
+ atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
+}
+
+/*
+ * Unmap sg lists, called when transfer is finished.
+ */
+static void atmci_pdc_cleanup(struct atmel_mci *host)
+{
+ struct mmc_data *data = host->data;
if (data)
- dma_unmap_sg(host->dma.chan->device->dev,
- data->sg, data->sg_len,
- ((data->flags & MMC_DATA_WRITE)
- ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+ dma_unmap_sg(&host->pdev->dev,
+ data->sg, data->sg_len,
+ ((data->flags & MMC_DATA_WRITE)
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
}
-static void atmci_stop_dma(struct atmel_mci *host)
+/*
+ * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
+ * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
+ * interrupt needed for both transfer directions.
+ */
+static void atmci_pdc_complete(struct atmel_mci *host)
{
- struct dma_chan *chan = host->data_chan;
+ atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+ atmci_pdc_cleanup(host);
- if (chan) {
- dmaengine_terminate_all(chan);
- atmci_dma_cleanup(host);
- } else {
- /* Data transfer was stopped by the interrupt handler */
+ /*
+ * If the card was removed, data will be NULL. No point trying
+ * to send the stop command or waiting for NBUSY in this case.
+ */
+ if (host->data) {
atmci_set_pending(host, EVENT_XFER_COMPLETE);
+ tasklet_schedule(&host->tasklet);
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
}
}
-/* This function is called by the DMA driver from tasklet context. */
+static void atmci_dma_cleanup(struct atmel_mci *host)
+{
+ struct mmc_data *data = host->data;
+
+ if (data)
+ dma_unmap_sg(host->dma.chan->device->dev,
+ data->sg, data->sg_len,
+ ((data->flags & MMC_DATA_WRITE)
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+}
+
+/*
+ * This function is called by the DMA driver from tasklet context.
+ */
static void atmci_dma_complete(void *arg)
{
struct atmel_mci *host = arg;
@@ -608,7 +695,7 @@ static void atmci_dma_complete(void *arg)
dev_vdbg(&host->pdev->dev, "DMA complete\n");
- if (atmci_is_mci2())
+ if (host->caps.has_dma)
/* Disable DMA hardware handshaking on MCI */
atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
@@ -646,7 +733,90 @@ static void atmci_dma_complete(void *arg)
}
}
-static int
+/*
+ * Returns a mask of interrupt flags to be enabled after the whole
+ * request has been prepared.
+ */
+static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
+{
+ u32 iflags;
+
+ data->error = -EINPROGRESS;
+
+ host->sg = data->sg;
+ host->data = data;
+ host->data_chan = NULL;
+
+ iflags = ATMCI_DATA_ERROR_FLAGS;
+
+ /*
+ * Errata: MMC data write operation with less than 12
+ * bytes is impossible.
+ *
+ * Errata: MCI Transmit Data Register (TDR) FIFO
+ * corruption when length is not multiple of 4.
+ */
+ if (data->blocks * data->blksz < 12
+ || (data->blocks * data->blksz) & 3)
+ host->need_reset = true;
+
+ host->pio_offset = 0;
+ if (data->flags & MMC_DATA_READ)
+ iflags |= ATMCI_RXRDY;
+ else
+ iflags |= ATMCI_TXRDY;
+
+ return iflags;
+}
+
+/*
+ * Set interrupt flags and set block length into the MCI mode register even
+ * if this value is also accessible in the MCI block register. It seems to be
+ * necessary before the High Speed MCI version. It also map sg and configure
+ * PDC registers.
+ */
+static u32
+atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
+{
+ u32 iflags, tmp;
+ unsigned int sg_len;
+ enum dma_data_direction dir;
+
+ data->error = -EINPROGRESS;
+
+ host->data = data;
+ host->sg = data->sg;
+ iflags = ATMCI_DATA_ERROR_FLAGS;
+
+ /* Enable pdc mode */
+ atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
+
+ if (data->flags & MMC_DATA_READ) {
+ dir = DMA_FROM_DEVICE;
+ iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
+ } else {
+ dir = DMA_TO_DEVICE;
+ iflags |= ATMCI_ENDTX | ATMCI_TXBUFE;
+ }
+
+ /* Set BLKLEN */
+ tmp = atmci_readl(host, ATMCI_MR);
+ tmp &= 0x0000ffff;
+ tmp |= ATMCI_BLKLEN(data->blksz);
+ atmci_writel(host, ATMCI_MR, tmp);
+
+ /* Configure PDC */
+ host->data_size = data->blocks * data->blksz;
+ sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
+ BUG_ON(sg_len < host->data_size / PAGE_SIZE);
+ if (host->data_size)
+ atmci_pdc_set_both_buf(host,
+ ((dir == DMA_FROM_DEVICE)?XFER_RECEIVE:XFER_TRANSMIT));
+
+ return iflags;
+}
+
+static u32
atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
{
struct dma_chan *chan;
@@ -655,20 +825,29 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
unsigned int i;
enum dma_data_direction direction;
unsigned int sglen;
+ u32 iflags;
+
+ data->error = -EINPROGRESS;
+
+ WARN_ON(host->data);
+ host->sg = NULL;
+ host->data = data;
+
+ iflags = ATMCI_DATA_ERROR_FLAGS;
/*
* We don't do DMA on "complex" transfers, i.e. with
* non-word-aligned buffers or lengths. Also, we don't bother
* with all the DMA setup overhead for short transfers.
*/
- if (data->blocks * data->blksz < ATATMCI_DMA_THRESHOLD)
- return -EINVAL;
+ if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
+ return atmci_prepare_data(host, data);
if (data->blksz & 3)
- return -EINVAL;
+ return atmci_prepare_data(host, data);
for_each_sg(data->sg, sg, data->sg_len, i) {
if (sg->offset & 3 || sg->length & 3)
- return -EINVAL;
+ return atmci_prepare_data(host, data);
}
/* If we don't have a channel, we can't do DMA */
@@ -679,7 +858,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
if (!chan)
return -ENODEV;
- if (atmci_is_mci2())
+ if (host->caps.has_dma)
atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
if (data->flags & MMC_DATA_READ)
@@ -688,7 +867,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
direction = DMA_TO_DEVICE;
sglen = dma_map_sg(chan->device->dev, data->sg,
- data->sg_len, direction);
+ data->sg_len, direction);
desc = chan->device->device_prep_slave_sg(chan,
data->sg, sglen, direction,
@@ -700,13 +879,32 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
desc->callback = atmci_dma_complete;
desc->callback_param = host;
- return 0;
+ return iflags;
unmap_exit:
dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
return -ENOMEM;
}
-static void atmci_submit_data(struct atmel_mci *host)
+static void
+atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
+{
+ return;
+}
+
+/*
+ * Start PDC according to transfer direction.
+ */
+static void
+atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
+{
+ if (data->flags & MMC_DATA_READ)
+ atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
+ else
+ atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+}
+
+static void
+atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
{
struct dma_chan *chan = host->data_chan;
struct dma_async_tx_descriptor *desc = host->dma.data_desc;
@@ -717,64 +915,39 @@ static void atmci_submit_data(struct atmel_mci *host)
}
}
-#else /* CONFIG_MMC_ATMELMCI_DMA */
-
-static int atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
+static void atmci_stop_transfer(struct atmel_mci *host)
{
- 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 */
atmci_set_pending(host, EVENT_XFER_COMPLETE);
atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
}
-#endif /* CONFIG_MMC_ATMELMCI_DMA */
-
/*
- * Returns a mask of interrupt flags to be enabled after the whole
- * request has been prepared.
+ * Stop data transfer because error(s) occured.
*/
-static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
+static void atmci_stop_transfer_pdc(struct atmel_mci *host)
{
- u32 iflags;
-
- data->error = -EINPROGRESS;
-
- WARN_ON(host->data);
- host->sg = NULL;
- host->data = data;
-
- iflags = ATMCI_DATA_ERROR_FLAGS;
- if (atmci_prepare_data_dma(host, data)) {
- host->data_chan = NULL;
+ atmci_set_pending(host, EVENT_XFER_COMPLETE);
+ atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
+}
- /*
- * Errata: MMC data write operation with less than 12
- * bytes is impossible.
- *
- * Errata: MCI Transmit Data Register (TDR) FIFO
- * corruption when length is not multiple of 4.
- */
- if (data->blocks * data->blksz < 12
- || (data->blocks * data->blksz) & 3)
- host->need_reset = true;
+static void atmci_stop_transfer_dma(struct atmel_mci *host)
+{
+ struct dma_chan *chan = host->data_chan;
- host->sg = data->sg;
- host->pio_offset = 0;
- if (data->flags & MMC_DATA_READ)
- iflags |= ATMCI_RXRDY;
- else
- iflags |= ATMCI_TXRDY;
+ if (chan) {
+ dmaengine_terminate_all(chan);
+ atmci_dma_cleanup(host);
+ } else {
+ /* Data transfer was stopped by the interrupt handler */
+ atmci_set_pending(host, EVENT_XFER_COMPLETE);
+ atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
}
-
- return iflags;
}
+/*
+ * Start a request: prepare data if needed, prepare the command and activate
+ * interrupts.
+ */
static void atmci_start_request(struct atmel_mci *host,
struct atmel_mci_slot *slot)
{
@@ -796,7 +969,7 @@ static void atmci_start_request(struct atmel_mci *host,
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
atmci_writel(host, ATMCI_MR, host->mode_reg);
- if (atmci_is_mci2())
+ if (host->caps.has_cfg_reg)
atmci_writel(host, ATMCI_CFG, host->cfg_reg);
host->need_reset = false;
}
@@ -824,7 +997,7 @@ static void atmci_start_request(struct atmel_mci *host,
dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
- iflags |= atmci_prepare_data(host, data);
+ iflags |= host->prepare_data(host, data);
}
iflags |= ATMCI_CMDRDY;
@@ -833,7 +1006,7 @@ static void atmci_start_request(struct atmel_mci *host,
atmci_start_command(host, cmd, cmdflags);
if (data)
- atmci_submit_data(host);
+ host->submit_data(host, data);
if (mrq->stop) {
host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
@@ -929,7 +1102,7 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
clk_enable(host->mck);
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
- if (atmci_is_mci2())
+ if (host->caps.has_cfg_reg)
atmci_writel(host, ATMCI_CFG, host->cfg_reg);
}
@@ -960,10 +1133,10 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
* stopping the clock when the FIFO is full/empty.
* This state is not expected to last for long.
*/
- if (atmci_has_rwproof())
+ if (host->caps.has_rwproof)
host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
- if (atmci_is_mci2()) {
+ if (host->caps.has_cfg_reg) {
/* setup High Speed mode in relation with card capacity */
if (ios->timing == MMC_TIMING_SD_HS)
host->cfg_reg |= ATMCI_CFG_HSMODE;
@@ -973,7 +1146,7 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (list_empty(&host->queue)) {
atmci_writel(host, ATMCI_MR, host->mode_reg);
- if (atmci_is_mci2())
+ if (host->caps.has_cfg_reg)
atmci_writel(host, ATMCI_CFG, host->cfg_reg);
} else {
host->need_clock_update = true;
@@ -1088,7 +1261,7 @@ static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
*/
if (host->need_clock_update) {
atmci_writel(host, ATMCI_MR, host->mode_reg);
- if (atmci_is_mci2())
+ if (host->caps.has_cfg_reg)
atmci_writel(host, ATMCI_CFG, host->cfg_reg);
}
@@ -1137,7 +1310,7 @@ static void atmci_command_complete(struct atmel_mci *host,
"command error: status=0x%08x\n", status);
if (cmd->data) {
- atmci_stop_dma(host);
+ host->stop_transfer(host);
host->data = NULL;
atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY
| ATMCI_TXRDY | ATMCI_RXRDY
@@ -1195,7 +1368,7 @@ static void atmci_detect_change(unsigned long data)
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
atmci_writel(host, ATMCI_MR, host->mode_reg);
- if (atmci_is_mci2())
+ if (host->caps.has_cfg_reg)
atmci_writel(host, ATMCI_CFG, host->cfg_reg);
host->data = NULL;
@@ -1211,7 +1384,7 @@ static void atmci_detect_change(unsigned long data)
/* fall through */
case STATE_SENDING_DATA:
mrq->data->error = -ENOMEDIUM;
- atmci_stop_dma(host);
+ host->stop_transfer(host);
break;
case STATE_DATA_BUSY:
case STATE_DATA_ERROR:
@@ -1290,7 +1463,7 @@ static void atmci_tasklet_func(unsigned long priv)
case STATE_SENDING_DATA:
if (atmci_test_and_clear_pending(host,
EVENT_DATA_ERROR)) {
- atmci_stop_dma(host);
+ host->stop_transfer(host);
if (data->stop)
atmci_send_stop_cmd(host, data);
state = STATE_DATA_ERROR;
@@ -1556,6 +1729,56 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
atmci_set_pending(host, EVENT_DATA_ERROR);
tasklet_schedule(&host->tasklet);
}
+
+ if (pending & ATMCI_ENDTX) {
+ atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
+ if (host->data_size) {
+ atmci_pdc_set_single_buf(host,
+ XFER_TRANSMIT, PDC_SECOND_BUF);
+ atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
+ }
+ }
+
+ if (pending & ATMCI_TXBUFE) {
+ atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
+ /*
+ * We can receive this interruption before having configured
+ * the second pdc buffer, so we need to reconfigure first and
+ * second buffers again
+ */
+ if (host->data_size) {
+ atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
+ atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
+ } else {
+ atmci_pdc_complete(host);
+ }
+ }
+
+ if (pending & ATMCI_ENDRX) {
+ atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
+
+ if (host->data_size) {
+ atmci_pdc_set_single_buf(host,
+ XFER_RECEIVE, PDC_SECOND_BUF);
+ atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
+ }
+ }
+
+ if (pending & ATMCI_RXBUFF) {
+ atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
+ /*
+ * We can receive this interruption before having configured
+ * the second pdc buffer, so we need to reconfigure first and
+ * second buffers again
+ */
+ if (host->data_size) {
+ atmci_pdc_set_both_buf(host, XFER_RECEIVE);
+ atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
+ } else {
+ atmci_pdc_complete(host);
+ }
+ }
+
if (pending & ATMCI_NOTBUSY) {
atmci_writel(host, ATMCI_IDR,
ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
@@ -1622,7 +1845,7 @@ static int __init atmci_init_slot(struct atmel_mci *host,
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
if (sdio_irq)
mmc->caps |= MMC_CAP_SDIO_IRQ;
- if (atmci_is_mci2())
+ if (host->caps.has_highspeed)
mmc->caps |= MMC_CAP_SD_HIGHSPEED;
if (slot_data->bus_width >= 4)
mmc->caps |= MMC_CAP_4_BIT_DATA;
@@ -1705,7 +1928,6 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
mmc_free_host(slot->mmc);
}
-#ifdef CONFIG_MMC_ATMELMCI_DMA
static bool atmci_filter(struct dma_chan *chan, void *slave)
{
struct mci_dma_data *sl = slave;
@@ -1747,9 +1969,61 @@ static void atmci_configure_dma(struct atmel_mci *host)
"Using %s for DMA transfers\n",
dma_chan_name(host->dma.chan));
}
+
+static inline unsigned int atmci_get_version(struct atmel_mci *host)
+{
+ return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
+}
+
+/*
+ * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
+ * HSMCI provides DMA support and a new config register but no more supports
+ * PDC.
+ */
+static void __init atmci_get_cap(struct atmel_mci *host)
+{
+ unsigned int version;
+
+ version = atmci_get_version(host);
+ dev_info(&host->pdev->dev,
+ "version: 0x%x\n", version);
+
+ host->caps.has_dma = 0;
+ host->caps.has_pdc = 0;
+ host->caps.has_cfg_reg = 0;
+ host->caps.has_cstor_reg = 0;
+ host->caps.has_highspeed = 0;
+ host->caps.has_rwproof = 0;
+
+ /* keep only major version number */
+ switch (version & 0xf00) {
+ case 0x100:
+ case 0x200:
+ host->caps.has_pdc = 1;
+ host->caps.has_rwproof = 1;
+ break;
+ case 0x300:
+ case 0x400:
+ case 0x500:
+#ifdef CONFIG_AT_HDMAC
+ host->caps.has_dma = 1;
#else
-static void atmci_configure_dma(struct atmel_mci *host) {}
+ host->caps.has_dma = 0;
+ dev_info(&host->pdev->dev,
+ "has dma capability but dma engine is not selected, "
+ "then use pio\n");
#endif
+ host->caps.has_cfg_reg = 1;
+ host->caps.has_cstor_reg = 1;
+ host->caps.has_highspeed = 1;
+ host->caps.has_rwproof = 1;
+ break;
+ default:
+ dev_warn(&host->pdev->dev,
+ "Unmanaged mci version, set minimum capabilities\n");
+ break;
+ }
+}
static int __init atmci_probe(struct platform_device *pdev)
{
@@ -1802,7 +2076,27 @@ static int __init atmci_probe(struct platform_device *pdev)
if (ret)
goto err_request_irq;
- atmci_configure_dma(host);
+ /* Get MCI capabilities and set operations according to it */
+ atmci_get_cap(host);
+ if (host->caps.has_dma) {
+ dev_info(&pdev->dev, "using DMA\n");
+ host->prepare_data = &atmci_prepare_data_dma;
+ host->submit_data = &atmci_submit_data_dma;
+ host->stop_transfer = &atmci_stop_transfer_dma;
+ } else if (host->caps.has_pdc) {
+ dev_info(&pdev->dev, "using PDC\n");
+ host->prepare_data = &atmci_prepare_data_pdc;
+ host->submit_data = &atmci_submit_data_pdc;
+ host->stop_transfer = &atmci_stop_transfer_pdc;
+ } else {
+ dev_info(&pdev->dev, "no DMA, no PDC\n");
+ host->prepare_data = &atmci_prepare_data;
+ host->submit_data = &atmci_submit_data;
+ host->stop_transfer = &atmci_stop_transfer;
+ }
+
+ if (host->caps.has_dma)
+ atmci_configure_dma(host);
platform_set_drvdata(pdev, host);
@@ -1834,10 +2128,8 @@ static int __init atmci_probe(struct platform_device *pdev)
return 0;
err_init_slot:
-#ifdef CONFIG_MMC_ATMELMCI_DMA
if (host->dma.chan)
dma_release_channel(host->dma.chan);
-#endif
free_irq(irq, host);
err_request_irq:
iounmap(host->regs);
--
1.7.0.4
More information about the linux-arm-kernel
mailing list