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path: root/drivers/mmc/host/dw_mmc.c
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Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
-rw-r--r--drivers/mmc/host/dw_mmc.c144
1 files changed, 75 insertions, 69 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 0e342793ff14..8bec1c36b159 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -22,7 +22,6 @@
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
-#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
@@ -502,8 +501,14 @@ static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
host->dir_status = DW_MCI_SEND_STATUS;
if (dw_mci_submit_data_dma(host, data)) {
+ int flags = SG_MITER_ATOMIC;
+ if (host->data->flags & MMC_DATA_READ)
+ flags |= SG_MITER_TO_SG;
+ else
+ flags |= SG_MITER_FROM_SG;
+
+ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
host->sg = data->sg;
- host->pio_offset = 0;
host->part_buf_start = 0;
host->part_buf_count = 0;
@@ -972,6 +977,7 @@ static void dw_mci_tasklet_func(unsigned long priv)
* generates a block interrupt, hence setting
* the scatter-gather pointer to NULL.
*/
+ sg_miter_stop(&host->sg_miter);
host->sg = NULL;
ctrl = mci_readl(host, CTRL);
ctrl |= SDMMC_CTRL_FIFO_RESET;
@@ -1311,54 +1317,44 @@ static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
static void dw_mci_read_data_pio(struct dw_mci *host)
{
- struct scatterlist *sg = host->sg;
- void *buf = sg_virt(sg);
- unsigned int offset = host->pio_offset;
+ struct sg_mapping_iter *sg_miter = &host->sg_miter;
+ void *buf;
+ unsigned int offset;
struct mmc_data *data = host->data;
int shift = host->data_shift;
u32 status;
unsigned int nbytes = 0, len;
+ unsigned int remain, fcnt;
do {
- len = host->part_buf_count +
- (SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
- if (offset + len <= sg->length) {
+ if (!sg_miter_next(sg_miter))
+ goto done;
+
+ host->sg = sg_miter->__sg;
+ buf = sg_miter->addr;
+ remain = sg_miter->length;
+ offset = 0;
+
+ do {
+ fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
+ << shift) + host->part_buf_count;
+ len = min(remain, fcnt);
+ if (!len)
+ break;
dw_mci_pull_data(host, (void *)(buf + offset), len);
-
offset += len;
nbytes += len;
-
- if (offset == sg->length) {
- flush_dcache_page(sg_page(sg));
- host->sg = sg = sg_next(sg);
- if (!sg)
- goto done;
-
- offset = 0;
- buf = sg_virt(sg);
- }
- } else {
- unsigned int remaining = sg->length - offset;
- dw_mci_pull_data(host, (void *)(buf + offset),
- remaining);
- nbytes += remaining;
-
- flush_dcache_page(sg_page(sg));
- host->sg = sg = sg_next(sg);
- if (!sg)
- goto done;
-
- offset = len - remaining;
- buf = sg_virt(sg);
- dw_mci_pull_data(host, buf, offset);
- nbytes += offset;
- }
+ remain -= len;
+ } while (remain);
+ sg_miter->consumed = offset;
status = mci_readl(host, MINTSTS);
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
if (status & DW_MCI_DATA_ERROR_FLAGS) {
host->data_status = status;
data->bytes_xfered += nbytes;
+ sg_miter_stop(sg_miter);
+ host->sg = NULL;
smp_wmb();
set_bit(EVENT_DATA_ERROR, &host->pending_events);
@@ -1367,65 +1363,66 @@ static void dw_mci_read_data_pio(struct dw_mci *host)
return;
}
} while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
- host->pio_offset = offset;
data->bytes_xfered += nbytes;
+
+ if (!remain) {
+ if (!sg_miter_next(sg_miter))
+ goto done;
+ sg_miter->consumed = 0;
+ }
+ sg_miter_stop(sg_miter);
return;
done:
data->bytes_xfered += nbytes;
+ sg_miter_stop(sg_miter);
+ host->sg = NULL;
smp_wmb();
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
}
static void dw_mci_write_data_pio(struct dw_mci *host)
{
- struct scatterlist *sg = host->sg;
- void *buf = sg_virt(sg);
- unsigned int offset = host->pio_offset;
+ struct sg_mapping_iter *sg_miter = &host->sg_miter;
+ void *buf;
+ unsigned int offset;
struct mmc_data *data = host->data;
int shift = host->data_shift;
u32 status;
unsigned int nbytes = 0, len;
+ unsigned int fifo_depth = host->fifo_depth;
+ unsigned int remain, fcnt;
do {
- len = ((host->fifo_depth -
- SDMMC_GET_FCNT(mci_readl(host, STATUS))) << shift)
- - host->part_buf_count;
- if (offset + len <= sg->length) {
+ if (!sg_miter_next(sg_miter))
+ goto done;
+
+ host->sg = sg_miter->__sg;
+ buf = sg_miter->addr;
+ remain = sg_miter->length;
+ offset = 0;
+
+ do {
+ fcnt = ((fifo_depth -
+ SDMMC_GET_FCNT(mci_readl(host, STATUS)))
+ << shift) - host->part_buf_count;
+ len = min(remain, fcnt);
+ if (!len)
+ break;
host->push_data(host, (void *)(buf + offset), len);
-
offset += len;
nbytes += len;
- if (offset == sg->length) {
- host->sg = sg = sg_next(sg);
- if (!sg)
- goto done;
-
- offset = 0;
- buf = sg_virt(sg);
- }
- } else {
- unsigned int remaining = sg->length - offset;
-
- host->push_data(host, (void *)(buf + offset),
- remaining);
- nbytes += remaining;
-
- host->sg = sg = sg_next(sg);
- if (!sg)
- goto done;
-
- offset = len - remaining;
- buf = sg_virt(sg);
- host->push_data(host, (void *)buf, offset);
- nbytes += offset;
- }
+ remain -= len;
+ } while (remain);
+ sg_miter->consumed = offset;
status = mci_readl(host, MINTSTS);
mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
if (status & DW_MCI_DATA_ERROR_FLAGS) {
host->data_status = status;
data->bytes_xfered += nbytes;
+ sg_miter_stop(sg_miter);
+ host->sg = NULL;
smp_wmb();
@@ -1435,12 +1432,20 @@ static void dw_mci_write_data_pio(struct dw_mci *host)
return;
}
} while (status & SDMMC_INT_TXDR); /* if TXDR write again */
- host->pio_offset = offset;
data->bytes_xfered += nbytes;
+
+ if (!remain) {
+ if (!sg_miter_next(sg_miter))
+ goto done;
+ sg_miter->consumed = 0;
+ }
+ sg_miter_stop(sg_miter);
return;
done:
data->bytes_xfered += nbytes;
+ sg_miter_stop(sg_miter);
+ host->sg = NULL;
smp_wmb();
set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
}
@@ -1643,6 +1648,7 @@ static void dw_mci_work_routine_card(struct work_struct *work)
* block interrupt, hence setting the
* scatter-gather pointer to NULL.
*/
+ sg_miter_stop(&host->sg_miter);
host->sg = NULL;
ctrl = mci_readl(host, CTRL);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-16 03:15:44 +0000