Commit f4237791 authored by Wan Ahmad Zainie's avatar Wan Ahmad Zainie Committed by Mark Brown

spi: dw: Add support for Intel Keem Bay SPI

Add support for Intel Keem Bay SPI controller, which uses DesignWare
DWC_ssi core. Bit 31 of CTRLR0 register is added for Keem Bay, to
configure the device as a master or as a slave serial peripheral.
Signed-off-by: default avatarWan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200505130618.554-6-wan.ahmad.zainie.wan.mohamad@intel.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent e539f435
...@@ -44,6 +44,13 @@ struct dw_spi_mmio { ...@@ -44,6 +44,13 @@ struct dw_spi_mmio {
#define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13) #define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13)
#define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5) #define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5)
/*
* For Keem Bay, CTRLR0[31] is used to select controller mode.
* 0: SSI is slave
* 1: SSI is master
*/
#define KEEMBAY_CTRLR0_SSIC_IS_MST BIT(31)
struct dw_spi_mscc { struct dw_spi_mscc {
struct regmap *syscon; struct regmap *syscon;
void __iomem *spi_mst; void __iomem *spi_mst;
...@@ -155,6 +162,24 @@ static int dw_spi_dwc_ssi_init(struct platform_device *pdev, ...@@ -155,6 +162,24 @@ static int dw_spi_dwc_ssi_init(struct platform_device *pdev,
return 0; return 0;
} }
static u32 dw_spi_update_cr0_keembay(struct spi_controller *master,
struct spi_device *spi,
struct spi_transfer *transfer)
{
u32 cr0 = dw_spi_update_cr0_v1_01a(master, spi, transfer);
return cr0 | KEEMBAY_CTRLR0_SSIC_IS_MST;
}
static int dw_spi_keembay_init(struct platform_device *pdev,
struct dw_spi_mmio *dwsmmio)
{
/* Register hook to configure CTRLR0 */
dwsmmio->dws.update_cr0 = dw_spi_update_cr0_keembay;
return 0;
}
static int dw_spi_mmio_probe(struct platform_device *pdev) static int dw_spi_mmio_probe(struct platform_device *pdev)
{ {
int (*init_func)(struct platform_device *pdev, int (*init_func)(struct platform_device *pdev,
...@@ -254,6 +279,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = { ...@@ -254,6 +279,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
{ .compatible = "amazon,alpine-dw-apb-ssi", .data = dw_spi_alpine_init}, { .compatible = "amazon,alpine-dw-apb-ssi", .data = dw_spi_alpine_init},
{ .compatible = "renesas,rzn1-spi", .data = dw_spi_dw_apb_init}, { .compatible = "renesas,rzn1-spi", .data = dw_spi_dw_apb_init},
{ .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init}, { .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init},
{ .compatible = "intel,keembay-ssi", .data = dw_spi_keembay_init},
{ /* end of table */} { /* end of table */}
}; };
MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
......
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