Add SPI SLAVE mode support for GENI based QuPv3.
Signed-off-by: Praveen Talari <quic_ptalari@xxxxxxxxxxx>
---
drivers/spi/spi-geni-qcom.c | 55 +++++++++++++++++++++++++++++++++----
1 file changed, 49 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index 206cc04bb1ed..2e3ae29e79e0 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -12,6 +12,7 @@
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
+#include <linux/property.h>
#include <linux/soc/qcom/geni-se.h>
#include <linux/spi/spi.h>
#include <linux/spinlock.h>
@@ -52,6 +53,9 @@
#define SPI_CS_CLK_DELAY_MSK GENMASK(19, 10)
#define SPI_CS_CLK_DELAY_SHFT 10
+#define SE_SPI_SLAVE_EN (0x2BC)
+#define SPI_SLAVE_EN BIT(0)
+
/* M_CMD OP codes for SPI */
#define SPI_TX_ONLY 1
#define SPI_RX_ONLY 2
@@ -99,6 +103,24 @@ struct spi_geni_master {
int cur_xfer_mode;
};
+static struct spi_master *get_spi_master(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct spi_master *spi = platform_get_drvdata(pdev);
+
+ return spi;
+}
+
+static void spi_slv_setup(struct spi_geni_master *mas)
+{
+ struct geni_se *se = &mas->se;
+
+ writel(SPI_SLAVE_EN, se->base + SE_SPI_SLAVE_EN);
+ writel(GENI_IO_MUX_0_EN, se->base + GENI_OUTPUT_CTRL);
+ writel(START_TRIGGER, se->base + SE_GENI_CFG_SEQ_START);
+ dev_info(mas->dev, "spi slave setup done\n");
+}
+
static int get_spi_clk_cfg(unsigned int speed_hz,
struct spi_geni_master *mas,
unsigned int *clk_idx,
@@ -140,12 +162,18 @@ static void handle_se_timeout(struct spi_master
*spi,
const struct spi_transfer *xfer;
spin_lock_irq(&mas->lock);
- reinit_completion(&mas->cancel_done);
if (mas->cur_xfer_mode == GENI_SE_FIFO)
writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
xfer = mas->cur_xfer;
mas->cur_xfer = NULL;
+
+ if (spi->slave) {
+ spin_unlock_irq(&mas->lock);
+ goto unmap_if_dma;
+ }
+
+ reinit_completion(&mas->cancel_done);
geni_se_cancel_m_cmd(se);
spin_unlock_irq(&mas->lock);
@@ -541,6 +569,8 @@ static bool geni_can_dma(struct spi_controller
*ctlr,
if (mas->cur_xfer_mode == GENI_GPI_DMA)
return true;
+ if (ctlr->slave)
+ return true;
len = get_xfer_len_in_words(xfer, mas);
fifo_size = mas->tx_fifo_depth * mas->fifo_width_bits /
mas->cur_bits_per_word;
@@ -619,6 +649,7 @@ static void spi_geni_release_dma_chan(struct
spi_geni_master *mas)
static int spi_geni_init(struct spi_geni_master *mas)
{
+ struct spi_master *spi = get_spi_master(mas->dev);
struct geni_se *se = &mas->se;
unsigned int proto, major, minor, ver;
u32 spi_tx_cfg, fifo_disable;
@@ -627,7 +658,14 @@ static int spi_geni_init(struct spi_geni_master
*mas)
pm_runtime_get_sync(mas->dev);
proto = geni_se_read_proto(se);
- if (proto != GENI_SE_SPI) {
+
+ if (spi->slave) {
+ if (proto != GENI_SE_SPI_SLAVE) {
+ dev_err(mas->dev, "Invalid proto %d\n", proto);
+ goto out_pm;
+ }
+ spi_slv_setup(mas);
+ } else if (proto != GENI_SE_SPI) {
dev_err(mas->dev, "Invalid proto %d\n", proto);
goto out_pm;
}
@@ -677,9 +715,11 @@ static int spi_geni_init(struct spi_geni_master
*mas)
}
/* We always control CS manually */
- spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
- spi_tx_cfg &= ~CS_TOGGLE;
- writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG);
+ if (!spi->slave) {
+ spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
+ spi_tx_cfg &= ~CS_TOGGLE;
+ writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG);
+ }
out_pm:
pm_runtime_put(mas->dev);
@@ -1072,6 +1112,9 @@ static int spi_geni_probe(struct
platform_device *pdev)
pm_runtime_set_autosuspend_delay(&pdev->dev, 250);
pm_runtime_enable(dev);
+ if (device_property_read_bool(&pdev->dev, "qcom,slv-ctrl"))
