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-rw-r--r--drivers/spi/armada100_spi.c11
-rw-r--r--drivers/spi/cf_qspi.c2
-rw-r--r--drivers/spi/exynos_spi.c91
-rw-r--r--drivers/spi/mxc_spi.c6
-rw-r--r--drivers/spi/tegra114_spi.c4
-rw-r--r--drivers/spi/tegra20_sflash.c2
6 files changed, 88 insertions, 28 deletions
diff --git a/drivers/spi/armada100_spi.c b/drivers/spi/armada100_spi.c
index afdbe0508c..b237c7c0fe 100644
--- a/drivers/spi/armada100_spi.c
+++ b/drivers/spi/armada100_spi.c
@@ -182,15 +182,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
goto done;
}
- if (dout)
- pss->tx = dout;
- else
- pss->tx = NULL;
-
- if (din)
- pss->rx = din;
- else
- pss->rx = NULL;
+ pss->tx = dout;
+ pss->rx = din;
if (flags & SPI_XFER_BEGIN) {
spi_cs_activate(slave);
diff --git a/drivers/spi/cf_qspi.c b/drivers/spi/cf_qspi.c
index a37ac4e526..06bcf91a4a 100644
--- a/drivers/spi/cf_qspi.c
+++ b/drivers/spi/cf_qspi.c
@@ -171,7 +171,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
volatile qspi_t *qspi = dev->regs;
u8 *txbuf = (u8 *)dout;
u8 *rxbuf = (u8 *)din;
- u32 count = ((bitlen / 8) + (bitlen % 8 ? 1 : 0));
+ u32 count = DIV_ROUND_UP(bitlen, 8);
u32 n, i = 0;
/* Sanitize arguments */
diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
index 607e1cdec2..7a25a35aa0 100644
--- a/drivers/spi/exynos_spi.c
+++ b/drivers/spi/exynos_spi.c
@@ -51,6 +51,7 @@ struct exynos_spi_slave {
unsigned int mode;
enum periph_id periph_id; /* Peripheral ID for this device */
unsigned int fifo_size;
+ int skip_preamble;
};
static struct spi_bus *spi_get_bus(unsigned dev_index)
@@ -105,6 +106,8 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
else
spi_slave->fifo_size = 256;
+ spi_slave->skip_preamble = 0;
+
spi_slave->freq = bus->frequency;
if (max_hz)
spi_slave->freq = min(max_hz, spi_slave->freq);
@@ -217,17 +220,23 @@ static void spi_request_bytes(struct exynos_spi *regs, int count)
writel(count | SPI_PACKET_CNT_EN, &regs->pkt_cnt);
}
-static void spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
- void **dinp, void const **doutp)
+static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
+ void **dinp, void const **doutp, unsigned long flags)
{
struct exynos_spi *regs = spi_slave->regs;
uchar *rxp = *dinp;
const uchar *txp = *doutp;
int rx_lvl, tx_lvl;
uint out_bytes, in_bytes;
+ int toread;
+ unsigned start = get_timer(0);
+ int stopping;
out_bytes = in_bytes = todo;
+ stopping = spi_slave->skip_preamble && (flags & SPI_XFER_END) &&
+ !(spi_slave->mode & SPI_SLAVE);
+
/*
* If there's something to send, do a software reset and set a
* transaction size.
@@ -238,6 +247,8 @@ static void spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
* Bytes are transmitted/received in pairs. Wait to receive all the
* data because then transmission will be done as well.
*/
+ toread = in_bytes;
+
while (in_bytes) {
int temp;
@@ -248,15 +259,43 @@ static void spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo,
writel(temp, &regs->tx_data);
out_bytes--;
}
- if (rx_lvl > 0 && in_bytes) {
+ if (rx_lvl > 0) {
temp = readl(&regs->rx_data);
- if (rxp)
- *rxp++ = temp;
- in_bytes--;
+ if (spi_slave->skip_preamble) {
+ if (temp == SPI_PREAMBLE_END_BYTE) {
+ spi_slave->skip_preamble = 0;
+ stopping = 0;
+ }
+ } else {
+ if (rxp || stopping)
+ *rxp++ = temp;
+ in_bytes--;
+ }
+ toread--;
+ } else if (!toread) {
+ /*
+ * We have run out of input data, but haven't read
+ * enough bytes after the preamble yet. Read some more,
+ * and make sure that we transmit dummy bytes too, to
+ * keep things going.
+ */
+ assert(!out_bytes);
+ out_bytes = in_bytes;
+ toread = in_bytes;
+ txp = NULL;
+ spi_request_bytes(regs, toread);
+ }
+ if (spi_slave->skip_preamble && get_timer(start) > 100) {
+ printf("SPI timeout: in_bytes=%d, out_bytes=%d, ",
+ in_bytes, out_bytes);
+ return -1;
}
}
+
*dinp = rxp;
*doutp = txp;
+
+ return 0;
}
/**
@@ -276,6 +315,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
int upto, todo;
int bytelen;
+ int ret = 0;
/* spi core configured to do 8 bit transfers */
if (bitlen % 8) {
@@ -289,16 +329,24 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
/* Exynos SPI limits each transfer to 65535 bytes */
bytelen = bitlen / 8;
- for (upto = 0; upto < bytelen; upto += todo) {
+ for (upto = 0; !ret && upto < bytelen; upto += todo) {
todo = min(bytelen - upto, (1 << 16) - 1);
- spi_rx_tx(spi_slave, todo, &din, &dout);
+ ret = spi_rx_tx(spi_slave, todo, &din, &dout, flags);
+ if (ret)
+ break;
}
/* Stop the transaction, if necessary. */
- if ((flags & SPI_XFER_END))
+ if ((flags & SPI_XFER_END) && !(spi_slave->mode & SPI_SLAVE)) {
spi_cs_deactivate(slave);
+ if (spi_slave->skip_preamble) {
+ assert(!spi_slave->skip_preamble);
+ debug("Failed to complete premable transaction\n");
+ ret = -1;
+ }
+ }
- return 0;
+ return ret;
}
/**
@@ -325,6 +373,7 @@ void spi_cs_activate(struct spi_slave *slave)
clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
debug("Activate CS, bus %d\n", spi_slave->slave.bus);
+ spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
}
/**
@@ -416,6 +465,28 @@ static int process_nodes(const void *blob, int node_list[], int count)
}
#endif
+/**
+ * Set up a new SPI slave for an fdt node
+ *
+ * @param blob Device tree blob
+ * @param node SPI peripheral node to use
+ * @return 0 if ok, -1 on error
+ */
+struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
+ unsigned int cs, unsigned int max_hz, unsigned int mode)
+{
+ struct spi_bus *bus;
+ unsigned int i;
+
+ for (i = 0, bus = spi_bus; i < bus_count; i++, bus++) {
+ if (bus->node == node)
+ return spi_setup_slave(i, cs, max_hz, mode);
+ }
+
+ debug("%s: Failed to find bus node %d\n", __func__, node);
+ return NULL;
+}
+
/* Sadly there is no error return from this function */
void spi_init(void)
{
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index 0eca7767e0..9c68d7d29f 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -218,7 +218,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
const u8 *dout, u8 *din, unsigned long flags)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
- int nbytes = (bitlen + 7) / 8;
+ int nbytes = DIV_ROUND_UP(bitlen, 8);
u32 data, cnt, i;
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
@@ -288,7 +288,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
/* Transfer completed, clear any pending request */
reg_write(&regs->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
- nbytes = (bitlen + 7) / 8;
+ nbytes = DIV_ROUND_UP(bitlen, 8);
cnt = nbytes % 32;
@@ -324,7 +324,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
- int n_bytes = (bitlen + 7) / 8;
+ int n_bytes = DIV_ROUND_UP(bitlen, 8);
int n_bits;
int ret;
u32 blk_size;
diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c
index b11a0a1ff7..4d2af483d7 100644
--- a/drivers/spi/tegra114_spi.c
+++ b/drivers/spi/tegra114_spi.c
@@ -152,13 +152,11 @@ struct spi_slave *tegra114_spi_setup_slave(unsigned int bus, unsigned int cs,
return NULL;
}
- spi = malloc(sizeof(struct tegra_spi_slave));
+ spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs);
if (!spi) {
printf("SPI error: malloc of SPI structure failed\n");
return NULL;
}
- spi->slave.bus = bus;
- spi->slave.cs = cs;
spi->ctrl = &spi_ctrls[bus];
if (!spi->ctrl) {
printf("SPI error: could not find controller for bus %d\n",
diff --git a/drivers/spi/tegra20_sflash.c b/drivers/spi/tegra20_sflash.c
index 9322ce7f64..7c3a3fc35b 100644
--- a/drivers/spi/tegra20_sflash.c
+++ b/drivers/spi/tegra20_sflash.c
@@ -132,8 +132,6 @@ struct spi_slave *tegra20_spi_setup_slave(unsigned int bus, unsigned int cs,
printf("SPI error: malloc of SPI structure failed\n");
return NULL;
}
- spi->slave.bus = bus;
- spi->slave.cs = cs;
spi->ctrl = &spi_ctrls[bus];
if (!spi->ctrl) {
printf("SPI error: could not find controller for bus %d\n",
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-28 12:23:46 +0000