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spi: spi-geni-qcom: Add SPI Device mode support for GENI based QuPv3

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Currently spi geni driver supports only master mode operation.

Add spi device mode support to GENI based QuPv3.

Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
Reviewed-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Link: https://lore.kernel.org/r/20230714042203.14251-3-quic_ptalari@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Praveen Talari 2023-07-14 09:52:03 +05:30 committed by Mark Brown
parent 59bbe86bb2
commit d7f74cc31a
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 47 additions and 6 deletions
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53
drivers/spi/spi-geni-qcom.c
View file

@ -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 +103,16 @@ struct spi_geni_master {
int cur_xfer_mode;
};
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 +154,22 @@ 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) {
/*
* skip CMD Cancel sequnece since spi slave
* doesn`t support CMD Cancel sequnece
*/
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 +566,10 @@ static bool geni_can_dma(struct spi_controller *ctlr,
if (mas->cur_xfer_mode == GENI_GPI_DMA)
return true;
/* Set SE 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 +647,7 @@ 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 = dev_get_drvdata(mas->dev);
struct geni_se *se = &mas->se;
unsigned int proto, major, minor, ver;
u32 spi_tx_cfg, fifo_disable;
@ -627,7 +656,14 @@ 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;
}
@ -679,9 +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);
@ -1074,6 +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, "spi-slave"))
spi->slave = true;
ret = geni_icc_get(&mas->se, NULL);
if (ret)
goto spi_geni_probe_runtime_disable;
@ -1094,7 +1135,7 @@ 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;
/*