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spi: cadence-quadspi: fix write completion support 

Some versions of the Cadence QSPI controller does not have the write
completion register implemented(CQSPI_REG_WR_COMPLETION_CTRL). On the
Intel SoCFPGA platform the CQSPI_REG_WR_COMPLETION_CTRL register is
not configured.

Add a quirk to not write to the CQSPI_REG_WR_COMPLETION_CTRL register.

Fixes: 9cb2ff1117 ("spi: cadence-quadspi: Disable Auto-HW polling)
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20211108200854.3616121-1-dinguyen@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dinh Nguyen 2021-11-08 14:08:54 -06:00 committed by Mark Brown
parent 28b5eaf971
commit 98d948eb83
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 21 additions and 3 deletions
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24
drivers/spi/spi-cadence-quadspi.c
View File

@ -37,6 +37,7 @@
#define CQSPI_NEEDS_WR_DELAY BIT(0)
#define CQSPI_DISABLE_DAC_MODE BIT(1)
#define CQSPI_SUPPORT_EXTERNAL_DMA BIT(2)
#define CQSPI_NO_SUPPORT_WR_COMPLETION BIT(3)
/* Capabilities */
#define CQSPI_SUPPORTS_OCTAL BIT(0)
@ -86,6 +87,7 @@ struct cqspi_st {
struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
bool use_dma_read;
u32 pd_dev_id;
bool wr_completion;
};
struct cqspi_driver_platdata {
@ -996,9 +998,11 @@ static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata,
* polling on the controller's side. spinand and spi-nor will take
* care of polling the status register.
*/
reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
reg |= CQSPI_REG_WR_DISABLE_AUTO_POLL;
writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
if (cqspi->wr_completion) {
reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
reg |= CQSPI_REG_WR_DISABLE_AUTO_POLL;
writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
}
reg = readl(reg_base + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
@ -1736,6 +1740,10 @@ static int cqspi_probe(struct platform_device *pdev)
cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
master->max_speed_hz = cqspi->master_ref_clk_hz;
/* write completion is supported by default */
cqspi->wr_completion = true;
ddata = of_device_get_match_data(dev);
if (ddata) {
if (ddata->quirks & CQSPI_NEEDS_WR_DELAY)
@ -1747,6 +1755,8 @@ static int cqspi_probe(struct platform_device *pdev)
cqspi->use_direct_mode = true;
if (ddata->quirks & CQSPI_SUPPORT_EXTERNAL_DMA)
cqspi->use_dma_read = true;
if (ddata->quirks & CQSPI_NO_SUPPORT_WR_COMPLETION)
cqspi->wr_completion = false;
if (of_device_is_compatible(pdev->dev.of_node,
"xlnx,versal-ospi-1.0"))
@ -1859,6 +1869,10 @@ static const struct cqspi_driver_platdata intel_lgm_qspi = {
.quirks = CQSPI_DISABLE_DAC_MODE,
};
static const struct cqspi_driver_platdata socfpga_qspi = {
.quirks = CQSPI_NO_SUPPORT_WR_COMPLETION,
};
static const struct cqspi_driver_platdata versal_ospi = {
.hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
.quirks = CQSPI_DISABLE_DAC_MODE | CQSPI_SUPPORT_EXTERNAL_DMA,
@ -1887,6 +1901,10 @@ static const struct of_device_id cqspi_dt_ids[] = {
.compatible = "xlnx,versal-ospi-1.0",
.data = (void *)&versal_ospi,
},
{
.compatible = "intel,socfpga-qspi",
.data = (void *)&socfpga_qspi,
},
{ /* end of table */ }
};