spi: lantiq: Add support to Lightning Mountain SoC (040f7f97) · Commits · 戴 / test

drivers/spi/Kconfig

+2 −2

Original line number	Diff line number	Diff line
		@@ -501,11 +501,11 @@ config SPI_NPCM_PSPI

		config SPI_LANTIQ_SSC
		tristate "Lantiq SSC SPI controller"
		depends on LANTIQ \|\| COMPILE_TEST
		depends on LANTIQ \|\| X86 \|\| COMPILE_TEST
		help
		This driver supports the Lantiq SSC SPI controller in master
		mode. This controller is found on Intel (former Lantiq) SoCs like
		the Danube, Falcon, xRX200, xRX300.
		the Danube, Falcon, xRX200, xRX300, Lightning Mountain.

		config SPI_OC_TINY
		tristate "OpenCores tiny SPI"

drivers/spi/spi-lantiq-ssc.c

+40 −0

Original line number	Diff line number	Diff line
		@@ -702,6 +702,24 @@ static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
		return IRQ_HANDLED;
		}

		static irqreturn_t intel_lgm_ssc_isr(int irq, void *data)
		{
		struct lantiq_ssc_spi *spi = data;
		const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
		u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);

		if (!(val & LTQ_SPI_IRNEN_ALL))
		return IRQ_NONE;

		if (val & LTQ_SPI_IRNEN_E)
		return lantiq_ssc_err_interrupt(irq, data);

		if ((val & hwcfg->irnen_t) \|\| (val & hwcfg->irnen_r))
		return lantiq_ssc_xmit_interrupt(irq, data);

		return IRQ_HANDLED;
		}

		static int transfer_start(struct lantiq_ssc_spi spi, struct spi_device spidev,
		struct spi_transfer *t)
		{
		@@ -802,6 +820,17 @@ static int lantiq_ssc_transfer_one(struct spi_master *master,
		return transfer_start(spi, spidev, t);
		}

		static int intel_lgm_cfg_irq(struct platform_device pdev, struct lantiq_ssc_spi spi)
		{
		int irq;

		irq = platform_get_irq(pdev, 0);
		if (irq < 0)
		return irq;

		return devm_request_irq(&pdev->dev, irq, intel_lgm_ssc_isr, 0, "spi", spi);
		}

		static int lantiq_cfg_irq(struct platform_device pdev, struct lantiq_ssc_spi spi)
		{
		int irq, err;
		@@ -854,10 +883,21 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
		.irq_ack = false,
		};

		static const struct lantiq_ssc_hwcfg intel_ssc_lgm = {
		.cfg_irq = intel_lgm_cfg_irq,
		.irnen_r = LTQ_SPI_IRNEN_R_XRX,
		.irnen_t = LTQ_SPI_IRNEN_T_XRX,
		.irnicr = 0xFC,
		.irncr = 0xF8,
		.fifo_size_mask = GENMASK(7, 0),
		.irq_ack = true,
		};

		static const struct of_device_id lantiq_ssc_match[] = {
		{ .compatible = "lantiq,ase-spi", .data = &lantiq_ssc_xway, },
		{ .compatible = "lantiq,falcon-spi", .data = &lantiq_ssc_xrx, },
		{ .compatible = "lantiq,xrx100-spi", .data = &lantiq_ssc_xrx, },
		{ .compatible = "intel,lgm-spi", .data = &intel_ssc_lgm, },
		{},
		};
		MODULE_DEVICE_TABLE(of, lantiq_ssc_match);

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