iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

spi: cadence-quadspi: Disable the DAC for Intel LGM SoC

Browse Source 
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 transfe

DAC bit resets to 1 so there is no need to explicitly set it.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Link: https://lore.kernel.org/r/20201124041840.31066-3-vadivel.muruganx.ramuthevar@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ramuthevar Vadivel Murugan 2020-11-24 12:18:37 +08:00 committed by Mark Brown
parent ab2d28750a
commit ad2775dc3f
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/spi/spi-cadence-quadspi.c
View File

@ -1384,10 +1384,12 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);
/* Enable Direct Access Controller */
reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
/* 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);
}
cqspi_controller_enable(cqspi, 1);
}
@ -1675,6 +1677,10 @@ 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",
@ -1690,6 +1696,7 @@ static const struct of_device_id cqspi_dt_ids[] = {
},
{
.compatible = "intel,lgm-qspi",
.data = &intel_lgm_qspi,
},
{ /* end of table */ }
};