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path: root/drivers/mmc/host/mvsdio.c
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Diffstat (limited to 'drivers/mmc/host/mvsdio.c')
-rw-r--r--drivers/mmc/host/mvsdio.c71
1 files changed, 18 insertions, 53 deletions
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index af7f21888e27..ca01b7d204ba 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -38,9 +38,8 @@ struct mvsd_host {
unsigned int xfer_mode;
unsigned int intr_en;
unsigned int ctrl;
- bool use_pio;
- struct sg_mapping_iter sg_miter;
unsigned int pio_size;
+ void *pio_ptr;
unsigned int sg_frags;
unsigned int ns_per_clk;
unsigned int clock;
@@ -115,18 +114,11 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
* data when the buffer is not aligned on a 64 byte
* boundary.
*/
- unsigned int miter_flags = SG_MITER_ATOMIC; /* Used from IRQ */
-
- if (data->flags & MMC_DATA_READ)
- miter_flags |= SG_MITER_TO_SG;
- else
- miter_flags |= SG_MITER_FROM_SG;
-
host->pio_size = data->blocks * data->blksz;
- sg_miter_start(&host->sg_miter, data->sg, data->sg_len, miter_flags);
+ host->pio_ptr = sg_virt(data->sg);
if (!nodma)
- dev_dbg(host->dev, "fallback to PIO for data\n");
- host->use_pio = true;
+ dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
+ host->pio_ptr, host->pio_size);
return 1;
} else {
dma_addr_t phys_addr;
@@ -137,7 +129,6 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
phys_addr = sg_dma_address(data->sg);
mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
- host->use_pio = false;
return 0;
}
}
@@ -297,8 +288,8 @@ static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
{
void __iomem *iobase = host->base;
- if (host->use_pio) {
- sg_miter_stop(&host->sg_miter);
+ if (host->pio_ptr) {
+ host->pio_ptr = NULL;
host->pio_size = 0;
} else {
dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
@@ -353,12 +344,9 @@ static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
static irqreturn_t mvsd_irq(int irq, void *dev)
{
struct mvsd_host *host = dev;
- struct sg_mapping_iter *sgm = &host->sg_miter;
void __iomem *iobase = host->base;
u32 intr_status, intr_done_mask;
int irq_handled = 0;
- u16 *p;
- int s;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
@@ -382,36 +370,15 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
spin_lock(&host->lock);
/* PIO handling, if needed. Messy business... */
- if (host->use_pio) {
- /*
- * As we set sgm->consumed this always gives a valid buffer
- * position.
- */
- if (!sg_miter_next(sgm)) {
- /* This should not happen */
- dev_err(host->dev, "ran out of scatter segments\n");
- spin_unlock(&host->lock);
- host->intr_en &=
- ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W |
- MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
- mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
- return IRQ_HANDLED;
- }
- p = sgm->addr;
- s = sgm->length;
- if (s > host->pio_size)
- s = host->pio_size;
- }
-
- if (host->use_pio &&
+ if (host->pio_size &&
(intr_status & host->intr_en &
(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
-
+ u16 *p = host->pio_ptr;
+ int s = host->pio_size;
while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
readsw(iobase + MVSD_FIFO, p, 16);
p += 16;
s -= 32;
- sgm->consumed += 32;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
/*
@@ -424,7 +391,6 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
put_unaligned(mvsd_read(MVSD_FIFO), p++);
put_unaligned(mvsd_read(MVSD_FIFO), p++);
s -= 4;
- sgm->consumed += 4;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
@@ -432,13 +398,10 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
val[0] = mvsd_read(MVSD_FIFO);
val[1] = mvsd_read(MVSD_FIFO);
memcpy(p, ((void *)&val) + 4 - s, s);
- sgm->consumed += s;
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
- /* PIO transfer done */
- host->pio_size -= sgm->consumed;
- if (host->pio_size == 0) {
+ if (s == 0) {
host->intr_en &=
~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
@@ -450,10 +413,14 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
}
dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
s, intr_status, mvsd_read(MVSD_HW_STATE));
+ host->pio_ptr = p;
+ host->pio_size = s;
irq_handled = 1;
- } else if (host->use_pio &&
+ } else if (host->pio_size &&
(intr_status & host->intr_en &
(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
+ u16 *p = host->pio_ptr;
+ int s = host->pio_size;
/*
* The TX_FIFO_8W bit is unreliable. When set, bursting
* 16 halfwords all at once in the FIFO drops data. Actually
@@ -464,7 +431,6 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
mvsd_write(MVSD_FIFO, get_unaligned(p++));
mvsd_write(MVSD_FIFO, get_unaligned(p++));
s -= 4;
- sgm->consumed += 4;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
if (s < 4) {
@@ -473,13 +439,10 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
memcpy(((void *)&val) + 4 - s, p, s);
mvsd_write(MVSD_FIFO, val[0]);
mvsd_write(MVSD_FIFO, val[1]);
- sgm->consumed += s;
s = 0;
intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
}
- /* PIO transfer done */
- host->pio_size -= sgm->consumed;
- if (host->pio_size == 0) {
+ if (s == 0) {
host->intr_en &=
~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
@@ -487,6 +450,8 @@ static irqreturn_t mvsd_irq(int irq, void *dev)
}
dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
s, intr_status, mvsd_read(MVSD_HW_STATE));
+ host->pio_ptr = p;
+ host->pio_size = s;
irq_handled = 1;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-21 02:34:53 +0300