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-rw-r--r--drivers/mmc/host/atmel-mci.c92
1 files changed, 78 insertions, 14 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index e94476beca18..6f56ef025ab5 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -91,6 +91,11 @@ struct atmel_mci_dma {
* @regs: Pointer to MMIO registers.
* @sg: Scatterlist entry currently being processed by PIO or PDC code.
* @pio_offset: Offset into the current scatterlist entry.
+ * @buffer: Buffer used if we don't have the r/w proof capability. We
+ * don't have the time to switch pdc buffers so we have to use only
+ * one buffer for the full transaction.
+ * @buf_size: size of the buffer.
+ * @phys_buf_addr: buffer address needed for pdc.
* @cur_slot: The slot which is currently using the controller.
* @mrq: The request currently being processed on @cur_slot,
* or NULL if the controller is idle.
@@ -166,6 +171,9 @@ struct atmel_mci {
struct scatterlist *sg;
unsigned int pio_offset;
+ unsigned int *buffer;
+ unsigned int buf_size;
+ dma_addr_t buf_phys_addr;
struct atmel_mci_slot *cur_slot;
struct mmc_request *mrq;
@@ -480,6 +488,11 @@ err:
dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
}
+static inline unsigned int atmci_get_version(struct atmel_mci *host)
+{
+ return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
+}
+
static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
unsigned int ns)
{
@@ -603,6 +616,7 @@ 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;
+ unsigned int buf_size;
if (dir == XFER_RECEIVE) {
pointer_reg = ATMEL_PDC_RPR;
@@ -617,8 +631,15 @@ static void atmci_pdc_set_single_buf(struct atmel_mci *host,
counter_reg += ATMEL_PDC_SCND_BUF_OFF;
}
- atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
- if (host->data_size <= sg_dma_len(host->sg)) {
+ if (!host->caps.has_rwproof) {
+ buf_size = host->buf_size;
+ atmci_writel(host, pointer_reg, host->buf_phys_addr);
+ } else {
+ buf_size = sg_dma_len(host->sg);
+ atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
+ }
+
+ if (host->data_size <= buf_size) {
if (host->data_size & 0x3) {
/* If size is different from modulo 4, transfer bytes */
atmci_writel(host, counter_reg, host->data_size);
@@ -670,7 +691,15 @@ static void atmci_pdc_cleanup(struct atmel_mci *host)
*/
static void atmci_pdc_complete(struct atmel_mci *host)
{
+ int transfer_size = host->data->blocks * host->data->blksz;
+
atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+
+ if ((!host->caps.has_rwproof)
+ && (host->data->flags & MMC_DATA_READ))
+ sg_copy_from_buffer(host->data->sg, host->data->sg_len,
+ host->buffer, transfer_size);
+
atmci_pdc_cleanup(host);
/*
@@ -818,6 +847,12 @@ atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
/* Configure PDC */
host->data_size = data->blocks * data->blksz;
sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
+
+ if ((!host->caps.has_rwproof)
+ && (host->data->flags & MMC_DATA_WRITE))
+ sg_copy_to_buffer(host->data->sg, host->data->sg_len,
+ host->buffer, host->data_size);
+
if (host->data_size)
atmci_pdc_set_both_buf(host,
((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
@@ -1877,13 +1912,26 @@ static int __init atmci_init_slot(struct atmel_mci *host,
mmc->caps |= MMC_CAP_SDIO_IRQ;
if (host->caps.has_highspeed)
mmc->caps |= MMC_CAP_SD_HIGHSPEED;
- if (slot_data->bus_width >= 4)
+ /*
+ * Without the read/write proof capability, it is strongly suggested to
+ * use only one bit for data to prevent fifo underruns and overruns
+ * which will corrupt data.
+ */
+ if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
mmc->caps |= MMC_CAP_4_BIT_DATA;
- mmc->max_segs = 64;
- mmc->max_req_size = 32768 * 512;
- mmc->max_blk_size = 32768;
- mmc->max_blk_count = 512;
+ if (atmci_get_version(host) < 0x200) {
+ mmc->max_segs = 256;
+ mmc->max_blk_size = 4095;
+ mmc->max_blk_count = 256;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+ mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
+ } else {
+ mmc->max_segs = 64;
+ mmc->max_req_size = 32768 * 512;
+ mmc->max_blk_size = 32768;
+ mmc->max_blk_count = 512;
+ }
/* Assume card is present initially */
set_bit(ATMCI_CARD_PRESENT, &slot->flags);
@@ -2007,11 +2055,6 @@ static bool atmci_configure_dma(struct atmel_mci *host)
}
}
-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
@@ -2138,14 +2181,20 @@ static int __init atmci_probe(struct platform_device *pdev)
if (pdata->slot[0].bus_width) {
ret = atmci_init_slot(host, &pdata->slot[0],
0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
- if (!ret)
+ if (!ret) {
nr_slots++;
+ host->buf_size = host->slot[0]->mmc->max_req_size;
+ }
}
if (pdata->slot[1].bus_width) {
ret = atmci_init_slot(host, &pdata->slot[1],
1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
- if (!ret)
+ if (!ret) {
nr_slots++;
+ if (host->slot[1]->mmc->max_req_size > host->buf_size)
+ host->buf_size =
+ host->slot[1]->mmc->max_req_size;
+ }
}
if (!nr_slots) {
@@ -2153,6 +2202,17 @@ static int __init atmci_probe(struct platform_device *pdev)
goto err_init_slot;
}
+ if (!host->caps.has_rwproof) {
+ host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
+ &host->buf_phys_addr,
+ GFP_KERNEL);
+ if (!host->buffer) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "buffer allocation failed\n");
+ goto err_init_slot;
+ }
+ }
+
dev_info(&pdev->dev,
"Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
host->mapbase, irq, nr_slots);
@@ -2179,6 +2239,10 @@ static int __exit atmci_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
+ if (host->buffer)
+ dma_free_coherent(&pdev->dev, host->buf_size,
+ host->buffer, host->buf_phys_addr);
+
for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
if (host->slot[i])
atmci_cleanup_slot(host->slot[i], i);
generated by cgit v1.2.3 (git 2.0.4) at 2024-10-14 23:23:46 +0000