| Message ID | 20230706051024.15422-3-quic_ptalari@quicinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | spi-geni-qcom: Add SPI device mode support for | expand |
Hi, On 7/6/2023 12:09 PM, Dmitry Baryshkov wrote: > On Thu, 6 Jul 2023 at 08:12, Praveen Talari <quic_ptalari@quicinc.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@quicinc.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. 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 >> >
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); + + 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, "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);
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> --- 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(-)