dw: spi: add support for Amazon's Alpine spi controller
Add support for a new devicetree compatible string called 'amazon,alpine-apb-ssi', which is necessary for the Amazon Alpine spi controller. 'amazon,alpine-dw-apb-ssi' is used in the dw spi driver if specified in the devicetree. Otherwise, fall back to driver default behavior, i.e. original dw IP hw driver behavior. Signed-off-by: Talel Shenhar <talel@amazon.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -126,6 +126,14 @@ static int dw_spi_mscc_jaguar2_init(struct platform_device *pdev,
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JAGUAR2_IF_SI_OWNER_OFFSET);
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}
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static int dw_spi_alpine_init(struct platform_device *pdev,
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struct dw_spi_mmio *dwsmmio)
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{
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dwsmmio->dws.cs_override = 1;
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return 0;
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}
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static int dw_spi_mmio_probe(struct platform_device *pdev)
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{
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int (*init_func)(struct platform_device *pdev,
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@ -230,6 +238,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
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{ .compatible = "snps,dw-apb-ssi", },
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{ .compatible = "mscc,ocelot-spi", .data = dw_spi_mscc_ocelot_init},
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{ .compatible = "mscc,jaguar2-spi", .data = dw_spi_mscc_jaguar2_init},
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{ .compatible = "amazon,alpine-dw-apb-ssi", .data = dw_spi_alpine_init},
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{ /* end of table */}
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};
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MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
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@ -144,6 +144,8 @@ void dw_spi_set_cs(struct spi_device *spi, bool enable)
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if (!enable)
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dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select));
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else if (dws->cs_override)
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dw_writel(dws, DW_SPI_SER, 0);
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}
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EXPORT_SYMBOL_GPL(dw_spi_set_cs);
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@ -463,6 +465,10 @@ static void spi_hw_init(struct device *dev, struct dw_spi *dws)
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dws->fifo_len = (fifo == 1) ? 0 : fifo;
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dev_dbg(dev, "Detected FIFO size: %u bytes\n", dws->fifo_len);
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}
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/* enable HW fixup for explicit CS deselect for Amazon's alpine chip */
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if (dws->cs_override)
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dw_writel(dws, DW_SPI_CS_OVERRIDE, 0xF);
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}
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int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
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@ -32,6 +32,7 @@
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#define DW_SPI_IDR 0x58
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#define DW_SPI_VERSION 0x5c
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#define DW_SPI_DR 0x60
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#define DW_SPI_CS_OVERRIDE 0xf4
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/* Bit fields in CTRLR0 */
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#define SPI_DFS_OFFSET 0
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@ -109,6 +110,7 @@ struct dw_spi {
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u32 fifo_len; /* depth of the FIFO buffer */
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u32 max_freq; /* max bus freq supported */
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int cs_override;
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u32 reg_io_width; /* DR I/O width in bytes */
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u16 bus_num;
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u16 num_cs; /* supported slave numbers */
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