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Message-ID: <20231018213328.40131-7-amit.kumar-mahapatra@amd.com>
Date: Thu, 19 Oct 2023 03:03:26 +0530
From: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
To: <broonie@...nel.org>, <tudor.ambarus@...aro.org>,
<pratyush@...nel.org>, <miquel.raynal@...tlin.com>,
<richard@....at>, <vigneshr@...com>
CC: <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<michael@...le.cc>, <linux-mtd@...ts.infradead.org>,
<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
<claudiu.beznea@...on.dev>, <michal.simek@....com>,
<linux-arm-kernel@...ts.infradead.org>, <git@....com>,
<amitrkcian2002@...il.com>, <akumarma@....com>,
Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
Subject: [PATCH v9 6/8] 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 9a46b2478f4e..c5d12ddd4ab3 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -154,6 +154,9 @@
#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};
@@ -465,15 +468,17 @@ 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 (!spi_get_chipselect(qspi, 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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