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Message-ID: <20221017121249.19061-8-amit.kumar-mahapatra@amd.com>
Date: Mon, 17 Oct 2022 17:42:46 +0530
From: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
To: <broonie@...nel.org>, <sanju.mehta@....com>,
<chin-ting_kuo@...eedtech.com>, <clg@...d.org>,
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Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
Subject: [PATCH 07/10] spi: spi-zynqmp-gqspi: Add stacked memories support in GQSPI driver
GQSPI supports two chip select CS0 & CS1. Update the driver to
assert/de-assert the appropriate chip select as per the bits set in
qspi->cs_index_mask.
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
---
drivers/spi/spi-zynqmp-gqspi.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 35ff734fb82d..4759f704bf5c 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -156,6 +156,9 @@
#define GQSPI_FREQ_100MHZ 100000000
#define GQSPI_FREQ_150MHZ 150000000
+#define GQSPI_SELECT_LOWER_CS BIT(0)
+#define GQSPI_SELECT_UPPER_CS BIT(1)
+
#define SPI_AUTOSUSPEND_TIMEOUT 3000
enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
@@ -467,15 +470,17 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
+ if (qspi->cs_index_mask & GQSPI_SELECT_UPPER_CS) {
+ zynqmp_gqspi_selectslave(xqspi,
+ GQSPI_SELECT_FLASH_CS_UPPER,
+ GQSPI_SELECT_FLASH_BUS_LOWER);
+ } else if (qspi->cs_index_mask & GQSPI_SELECT_LOWER_CS) {
+ zynqmp_gqspi_selectslave(xqspi,
+ GQSPI_SELECT_FLASH_CS_LOWER,
+ GQSPI_SELECT_FLASH_BUS_LOWER);
+ }
+ genfifoentry |= xqspi->genfifobus;
if (!is_high) {
- if (!qspi->chip_select[0]) {
- xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
- xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER;
- } else {
- xqspi->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
- xqspi->genfifocs = GQSPI_GENFIFO_CS_UPPER;
- }
- genfifoentry |= xqspi->genfifobus;
genfifoentry |= xqspi->genfifocs;
genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
} else {
--
2.17.1
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