Hi, On 7/6/2023 12:09 PM, Dmitry Baryshkov wrote:
On Thu, 6 Jul 2023 at 08:12, Praveen Talari <quic_ptalari@xxxxxxxxxxx> 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@xxxxxxxxxxx> --- 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.
Done
+ + 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.
Done
+ 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
Done
+ 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
