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path: root/drivers/spi/spi-sirf.c
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Diffstat (limited to 'drivers/spi/spi-sirf.c')
-rw-r--r--drivers/spi/spi-sirf.c47
1 files changed, 24 insertions, 23 deletions
diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index acfca880fe84..4461cdc7415d 100644
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -130,8 +130,7 @@
#define ALIGNED(x) (!((u32)x & 0x3))
#define IS_DMA_VALID(x) (x && ALIGNED(x->tx_buf) && ALIGNED(x->rx_buf) && \
- ALIGNED(x->len * sspi->word_width) && (x->len * sspi->word_width < \
- 2 * PAGE_SIZE))
+ ALIGNED(x->len) && (x->len < 2 * PAGE_SIZE))
struct sirfsoc_spi {
struct spi_bitbang bitbang;
@@ -152,8 +151,8 @@ struct sirfsoc_spi {
void (*tx_word) (struct sirfsoc_spi *);
/* number of words left to be tranmitted/received */
- unsigned int left_tx_cnt;
- unsigned int left_rx_cnt;
+ unsigned int left_tx_word;
+ unsigned int left_rx_word;
/* rx & tx DMA channels */
struct dma_chan *rx_chan;
@@ -178,7 +177,7 @@ static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi)
sspi->rx = rx;
}
- sspi->left_rx_cnt--;
+ sspi->left_rx_word--;
}
static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi)
@@ -192,7 +191,7 @@ static void spi_sirfsoc_tx_word_u8(struct sirfsoc_spi *sspi)
}
writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
- sspi->left_tx_cnt--;
+ sspi->left_tx_word--;
}
static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi)
@@ -207,7 +206,7 @@ static void spi_sirfsoc_rx_word_u16(struct sirfsoc_spi *sspi)
sspi->rx = rx;
}
- sspi->left_rx_cnt--;
+ sspi->left_rx_word--;
}
static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi)
@@ -221,7 +220,7 @@ static void spi_sirfsoc_tx_word_u16(struct sirfsoc_spi *sspi)
}
writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
- sspi->left_tx_cnt--;
+ sspi->left_tx_word--;
}
static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi)
@@ -236,7 +235,7 @@ static void spi_sirfsoc_rx_word_u32(struct sirfsoc_spi *sspi)
sspi->rx = rx;
}
- sspi->left_rx_cnt--;
+ sspi->left_rx_word--;
}
@@ -251,7 +250,7 @@ static void spi_sirfsoc_tx_word_u32(struct sirfsoc_spi *sspi)
}
writel(data, sspi->base + SIRFSOC_SPI_TXFIFO_DATA);
- sspi->left_tx_cnt--;
+ sspi->left_tx_word--;
}
static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id)
@@ -272,18 +271,18 @@ static irqreturn_t spi_sirfsoc_irq(int irq, void *dev_id)
| SIRFSOC_SPI_RXFIFO_THD_REACH))
while (!((readl(sspi->base + SIRFSOC_SPI_RXFIFO_STATUS)
& SIRFSOC_SPI_FIFO_EMPTY)) &&
- sspi->left_rx_cnt)
+ sspi->left_rx_word)
sspi->rx_word(sspi);
if (spi_stat & (SIRFSOC_SPI_FIFO_EMPTY
| SIRFSOC_SPI_TXFIFO_THD_REACH))
while (!((readl(sspi->base + SIRFSOC_SPI_TXFIFO_STATUS)
& SIRFSOC_SPI_FIFO_FULL)) &&
- sspi->left_tx_cnt)
+ sspi->left_tx_word)
sspi->tx_word(sspi);
/* Received all words */
- if ((sspi->left_rx_cnt == 0) && (sspi->left_tx_cnt == 0)) {
+ if ((sspi->left_rx_word == 0) && (sspi->left_tx_word == 0)) {
complete(&sspi->rx_done);
writel(0x0, sspi->base + SIRFSOC_SPI_INT_EN);
}
@@ -305,25 +304,28 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
sspi->tx = t->tx_buf ? t->tx_buf : sspi->dummypage;
sspi->rx = t->rx_buf ? t->rx_buf : sspi->dummypage;
- sspi->left_tx_cnt = sspi->left_rx_cnt = t->len;
+ sspi->left_tx_word = sspi->left_rx_word = t->len / sspi->word_width;
INIT_COMPLETION(sspi->rx_done);
INIT_COMPLETION(sspi->tx_done);
writel(SIRFSOC_SPI_INT_MASK_ALL, sspi->base + SIRFSOC_SPI_INT_STATUS);
- if (t->len == 1) {
+ if (sspi->left_tx_word == 1) {
writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
SIRFSOC_SPI_ENA_AUTO_CLR,
sspi->base + SIRFSOC_SPI_CTRL);
writel(0, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
writel(0, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
- } else if ((t->len > 1) && (t->len < SIRFSOC_SPI_DAT_FRM_LEN_MAX)) {
+ } else if ((sspi->left_tx_word > 1) && (sspi->left_tx_word <
+ SIRFSOC_SPI_DAT_FRM_LEN_MAX)) {
writel(readl(sspi->base + SIRFSOC_SPI_CTRL) |
SIRFSOC_SPI_MUL_DAT_MODE |
SIRFSOC_SPI_ENA_AUTO_CLR,
sspi->base + SIRFSOC_SPI_CTRL);
- writel(t->len - 1, sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
- writel(t->len - 1, sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
+ writel(sspi->left_tx_word - 1,
+ sspi->base + SIRFSOC_SPI_TX_DMA_IO_LEN);
+ writel(sspi->left_tx_word - 1,
+ sspi->base + SIRFSOC_SPI_RX_DMA_IO_LEN);
} else {
writel(readl(sspi->base + SIRFSOC_SPI_CTRL),
sspi->base + SIRFSOC_SPI_CTRL);
@@ -338,18 +340,17 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
if (IS_DMA_VALID(t)) {
struct dma_async_tx_descriptor *rx_desc, *tx_desc;
- unsigned int size = t->len * sspi->word_width;
sspi->dst_start = dma_map_single(&spi->dev, sspi->rx, t->len, DMA_FROM_DEVICE);
rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,
- sspi->dst_start, size, DMA_DEV_TO_MEM,
+ sspi->dst_start, t->len, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
rx_desc->callback = spi_sirfsoc_dma_fini_callback;
rx_desc->callback_param = &sspi->rx_done;
sspi->src_start = dma_map_single(&spi->dev, (void *)sspi->tx, t->len, DMA_TO_DEVICE);
tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,
- sspi->src_start, size, DMA_MEM_TO_DEV,
+ sspi->src_start, t->len, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
tx_desc->callback = spi_sirfsoc_dma_fini_callback;
tx_desc->callback_param = &sspi->tx_done;
@@ -377,7 +378,7 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
dev_err(&spi->dev, "transfer timeout\n");
dmaengine_terminate_all(sspi->rx_chan);
} else
- sspi->left_rx_cnt = 0;
+ sspi->left_rx_word = 0;
/*
* we only wait tx-done event if transferring by DMA. for PIO,
@@ -402,7 +403,7 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
writel(0, sspi->base + SIRFSOC_SPI_TX_RX_EN);
writel(0, sspi->base + SIRFSOC_SPI_INT_EN);
- return t->len - sspi->left_rx_cnt;
+ return t->len - sspi->left_rx_word * sspi->word_width;
}
static void spi_sirfsoc_chipselect(struct spi_device *spi, int value)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 17:41:52 +0000