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Message-ID: <20230615070706.18322-4-quic_ptalari@quicinc.com>
Date: Thu, 15 Jun 2023 12:37:06 +0530
From: Praveen Talari <quic_ptalari@...cinc.com>
To: <agross@...nel.org>, <andersson@...nel.org>,
<konrad.dybcio@...aro.org>, <broonie@...nel.org>,
<robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
<conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <quic_msavaliy@...cinc.com>, <quic_vtanuku@...cinc.com>,
<quic_vnivarth@...cinc.com>, <quic_arandive@...cinc.com>,
Praveen Talari <quic_ptalari@...cinc.com>
Subject: [PATCH v2 3/3] spi: spi-geni-qcom: Add SPI SLAVE mode support for GENI based QuPv3
Currently spi geni driver supports only master mode operation.
Add slave mode support to GENI based QuPv3.
Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>
---
v1 -> v2
- modified the commit message
- added the code changes for code comments
---
---
drivers/spi/spi-geni-qcom.c | 57 +++++++++++++++++++++++++++++++++----
1 file changed, 51 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index 206cc04bb1ed..2170bd6b7eef 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_dbg(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);
@@ -542,6 +570,10 @@ static bool geni_can_dma(struct spi_controller *ctlr,
if (mas->cur_xfer_mode == GENI_GPI_DMA)
return true;
+ /* Set DMA mode for SPI slave. */
+ 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 +651,7 @@ 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 +660,14 @@ 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 +717,11 @@ 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 +1114,9 @@ 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"))
+ spi->slave = true;
+
ret = geni_icc_get(&mas->se, NULL);
if (ret)
goto spi_geni_probe_runtime_disable;
@@ -1092,7 +1137,7 @@ static int spi_geni_probe(struct platform_device *pdev)
* for dma (gsi) mode, the gsi will set cs based on params passed in
* TRE
*/
- if (mas->cur_xfer_mode == GENI_SE_FIFO)
+ if (!spi->slave && mas->cur_xfer_mode == GENI_SE_FIFO)
spi->set_cs = spi_geni_set_cs;
ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi);
--
2.17.1
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