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Message-ID: <CAA8EJprU3FhEWodw2rfFiYkw3rg_WaxqZOOQOt=mcp3xfsoJUw@mail.gmail.com>
Date: Thu, 6 Jul 2023 09:39:56 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Praveen Talari <quic_ptalari@...cinc.com>
Cc: agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
broonie@...nel.org, linux-arm-msm@...r.kernel.org,
linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
quic_msavaliy@...cinc.com, quic_vtanuku@...cinc.com,
quic_vnivarth@...cinc.com, quic_arandive@...cinc.com
Subject: Re: [PATCH v4 2/2] spi: spi-geni-qcom: Add SPI Device mode support
for GENI based QuPv3
On Thu, 6 Jul 2023 at 08:12, Praveen Talari <quic_ptalari@...cinc.com> wrote:
>
> 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@...cinc.com>
> ---
> v3 -> v4:
> - Used existing property spi-slave.
>
> v2 -> v3:
> - modified commit message to use device mode instead of slave mode
>
> 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..4ec4fdee06b5 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);
You can use dev_get_drvdata() directly, without going through platform_device.
> +
> + 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) {
A comment here would be nice.
> + 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. */
SE DMA mode
> + 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, "spi-slave"))
> + 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
>
--
With best wishes
Dmitry
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