This patch adds support for v1.1.1 of the SPI QUP controller.
Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx>
---
drivers/spi/spi-qup.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index b518b51..abad630 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -144,6 +144,7 @@ struct spi_qup {
int w_size; /* bytes per SPI word */
int tx_bytes;
int rx_bytes;
+ int qup_v1;
};
@@ -422,7 +423,9 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
config |= QUP_CONFIG_SPI_MODE;
writel_relaxed(config, controller->base + QUP_CONFIG);
- writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
+ /* only write to OPERATIONAL_MASK when register is present */
+ if (!controller->qup_v1)
+ writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
return 0;
}
@@ -488,7 +491,7 @@ static int spi_qup_probe(struct platform_device *pdev)
struct resource *res;
struct device *dev;
void __iomem *base;
- u32 data, max_freq, iomode;
+ u32 data = 0, max_freq, iomode;
int ret, irq, size;
dev = &pdev->dev;
@@ -531,15 +534,6 @@ static int spi_qup_probe(struct platform_device *pdev)
return ret;
}
- data = readl_relaxed(base + QUP_HW_VERSION);
-
- if (data < QUP_HW_VERSION_2_1_1) {
- clk_disable_unprepare(cclk);
- clk_disable_unprepare(iclk);
- dev_err(dev, "v.%08x is not supported\n", data);
- return -ENXIO;
- }
-
master = spi_alloc_master(dev, sizeof(struct spi_qup));
if (!master) {
clk_disable_unprepare(cclk);
@@ -567,6 +561,10 @@ static int spi_qup_probe(struct platform_device *pdev)
controller->cclk = cclk;
controller->irq = irq;
+ /* set v1 flag if device is version 1 */
+ if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
+ controller->qup_v1 = 1;
+
spin_lock_init(&controller->lock);
init_completion(&controller->done);
@@ -604,10 +602,19 @@ static int spi_qup_probe(struct platform_device *pdev)
writel_relaxed(0, base + QUP_OPERATIONAL);
writel_relaxed(0, base + QUP_IO_M_MODES);
- writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
+ if (!controller->qup_v1)
+ writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
base + SPI_ERROR_FLAGS_EN);
+ /* if earlier version of the QUP, disable INPUT_OVERRUN */
+ if (controller->qup_v1)
+ writel_relaxed(QUP_ERROR_OUTPUT_OVER_RUN |
+ QUP_ERROR_INPUT_UNDER_RUN | QUP_ERROR_OUTPUT_UNDER_RUN,
+ base + QUP_ERROR_FLAGS_EN);
+
writel_relaxed(0, base + SPI_CONFIG);
writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
@@ -729,6 +736,7 @@ static int spi_qup_remove(struct platform_device *pdev)
}
static struct of_device_id spi_qup_dt_match[] = {
+ { .compatible = "qcom,spi-qup-v1.1.1", },
{ .compatible = "qcom,spi-qup-v2.1.1", },
{ .compatible = "qcom,spi-qup-v2.2.1", },
{ }
--
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