summaryrefslogtreecommitdiff
path: root/drivers/spi/spi-ti-qspi.c
diff options
context:
space:
mode:
authorJean Pihet <jean.pihet@newoldbits.com>2020-01-14 15:41:24 +0300
committerMark Brown <broonie@kernel.org>2020-01-14 18:25:46 +0300
commite97f491450805fe6cbfd482b97b5427b21dec575 (patch)
tree27b45d080c20d63d4e7c601b15520350a66c79e9 /drivers/spi/spi-ti-qspi.c
parentb8d40d7712f10475effc4552eda96b9d44822cfb (diff)
downloadlinux-e97f491450805fe6cbfd482b97b5427b21dec575.tar.xz
spi: spi-ti-qspi: support large flash devices
The TI QSPI IP has limitations: - the MMIO region is 64MB in size - in non-MMIO mode, the transfer can handle 4096 words max. Add support for bigger devices. Use MMIO and DMA transfers below the 64MB boundary, use software generated transfers above. Signed-off-by: Jean Pihet <jean.pihet@newoldbits.com> Cc: Ryan Barnett <ryan.barnett@rockwellcollins.com> Cc: Conrad Ratschan <conrad.ratschan@rockwellcollins.com> Cc: Arnout Vandecappelle <arnout.vandecappelle@essensium.com> Link: https://lore.kernel.org/r/20200114124125.361429-2-jean.pihet@newoldbits.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-ti-qspi.c')
-rw-r--r--drivers/spi/spi-ti-qspi.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index ad2942b3d0a9..0334e2926998 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -525,6 +525,35 @@ static void ti_qspi_setup_mmap_read(struct spi_device *spi, u8 opcode,
QSPI_SPI_SETUP_REG(spi->chip_select));
}
+static int ti_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
+{
+ struct ti_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
+ size_t max_len;
+
+ if (op->data.dir == SPI_MEM_DATA_IN) {
+ if (op->addr.val < qspi->mmap_size) {
+ /* Limit MMIO to the mmaped region */
+ if (op->addr.val + op->data.nbytes > qspi->mmap_size) {
+ max_len = qspi->mmap_size - op->addr.val;
+ op->data.nbytes = min((size_t) op->data.nbytes,
+ max_len);
+ }
+ } else {
+ /*
+ * Use fallback mode (SW generated transfers) above the
+ * mmaped region.
+ * Adjust size to comply with the QSPI max frame length.
+ */
+ max_len = QSPI_FRAME;
+ max_len -= 1 + op->addr.nbytes + op->dummy.nbytes;
+ op->data.nbytes = min((size_t) op->data.nbytes,
+ max_len);
+ }
+ }
+
+ return 0;
+}
+
static int ti_qspi_exec_mem_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
@@ -575,6 +604,7 @@ static int ti_qspi_exec_mem_op(struct spi_mem *mem,
static const struct spi_controller_mem_ops ti_qspi_mem_ops = {
.exec_op = ti_qspi_exec_mem_op,
+ .adjust_op_size = ti_qspi_adjust_op_size,
};
static int ti_qspi_start_transfer_one(struct spi_master *master,