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Message-Id: <20201026094519.56083-3-vadivel.muruganx.ramuthevar@linux.intel.com>
Date: Mon, 26 Oct 2020 17:45:15 +0800
From: "Ramuthevar,Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com>
To: broonie@...nel.org, vigneshr@...com, tudor.ambarus@...rochip.com,
linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
robh+dt@...nel.org
Cc: devicetree@...r.kernel.org, miquel.raynal@...tlin.com,
simon.k.r.goldschmidt@...il.com, dinguyen@...nel.org,
richard@....at, cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
Ramuthevar Vadivel Murugan
<vadivel.muruganx.ramuthevar@...ux.intel.com>
Subject: [PATCH v3 2/6] spi: cadence-quadspi: Disable the DAC for Intel LGM SoC
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
On Intel Lightning Mountain(LGM) SoCs QSPI controller do not use
Direct Access Controller(DAC).
This patch adds a quirk to disable the Direct Access Controller
for data transfer instead it uses indirect data transfer.
Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
---
drivers/spi/spi-cadence-quadspi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index d7b10c46fa70..6d6f7c440ece 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1107,6 +1107,13 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
cqspi_controller_enable(cqspi, 1);
+
+ /* Disable direct access controller */
+ if (!cqspi->use_direct_mode) {
+ reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+ reg &= ~CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
+ writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+ }
}
static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
@@ -1388,6 +1395,10 @@ static const struct cqspi_driver_platdata am654_ospi = {
.quirks = CQSPI_NEEDS_WR_DELAY,
};
+static const struct cqspi_driver_platdata intel_lgm_qspi = {
+ .quirks = CQSPI_DISABLE_DAC_MODE,
+};
+
static const struct of_device_id cqspi_dt_ids[] = {
{
.compatible = "cdns,qspi-nor",
@@ -1403,6 +1414,7 @@ static const struct of_device_id cqspi_dt_ids[] = {
},
{
.compatible = "intel,lgm-qspi",
+ .data = &intel_lgm_qspi,
},
{ /* end of table */ }
};
--
2.11.0
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