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Commit bf77cba9 authored by Padmavathi Venna's avatar Padmavathi Venna Committed by Mark Brown
Browse files

spi: s3c64xx: add support for exynos7 SPI controller 



Exynos7 SPI controller supports only the auto Selection of
CS toggle mode and Exynos7 SoC includes six SPI controllers.
Add support for these changes in Exynos7 SPI controller driver.

Signed-off-by: default avatarPadmavathi Venna <padma.v@samsung.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f114040e

Documentation/devicetree/bindings/spi/spi-samsung.txt

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ Required SoC Specific Properties: 
    - samsung,s3c2443-spi: for s3c2443, s3c2416 and s3c2450 platforms

    - samsung,s3c6410-spi: for s3c6410 platforms

    - samsung,s5pv210-spi: for s5pv210 and s5pc110 platforms

    - samsung,exynos4210-spi: for exynos4 and exynos5 platforms

    - samsung,exynos7-spi: for exynos7 platforms



- reg: physical base address of the controller and length of memory mapped

  region.

drivers/spi/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -444,7 +444,7 @@ config SPI_S3C24XX_FIQ 


config SPI_S3C64XX

	tristate "Samsung S3C64XX series type SPI"

	depends on PLAT_SAMSUNG

	depends on (PLAT_SAMSUNG || ARCH_EXYNOS)

	select S3C64XX_PL080 if ARCH_S3C64XX

	help

	  SPI driver for Samsung S3C64XX and newer SoCs.

drivers/spi/spi-s3c64xx.c

+27 −5
Original line number Diff line number Diff line
@@ -33,8 +33,9 @@ 


#include <linux/platform_data/spi-s3c64xx.h>



#define MAX_SPI_PORTS		3

#define MAX_SPI_PORTS		6

#define S3C64XX_SPI_QUIRK_POLL		(1 << 0)

#define S3C64XX_SPI_QUIRK_CS_AUTO	(1 << 1)



/* Registers and bit-fields */
@@ -78,6 +79,7 @@ 


#define S3C64XX_SPI_SLAVE_AUTO			(1<<1)

#define S3C64XX_SPI_SLAVE_SIG_INACT		(1<<0)

#define S3C64XX_SPI_SLAVE_NSC_CNT_2		(2<<4)



#define S3C64XX_SPI_INT_TRAILING_EN		(1<<6)

#define S3C64XX_SPI_INT_RX_OVERRUN_EN		(1<<5)
@@ -717,7 +719,12 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master, 
	enable_datapath(sdd, spi, xfer, use_dma);



	/* Start the signals */

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	else

		writel(readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL)

			| S3C64XX_SPI_SLAVE_AUTO | S3C64XX_SPI_SLAVE_NSC_CNT_2,

			sdd->regs + S3C64XX_SPI_SLAVE_SEL);



	spin_unlock_irqrestore(&sdd->lock, flags);
@@ -866,12 +873,14 @@ static int s3c64xx_spi_setup(struct spi_device *spi) 
	}



	pm_runtime_put(&sdd->pdev->dev);

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);

	return 0;



setup_exit:

	pm_runtime_put(&sdd->pdev->dev);

	/* setup() returns with device de-selected */

	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);



	if (gpio_is_valid(spi->cs_gpio))
@@ -946,6 +955,7 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel) 


	sdd->cur_speed = 0;



	if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))

		writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);



	/* Disable Interrupts - we use Polling if not DMA mode */
@@ -1341,6 +1351,15 @@ static struct s3c64xx_spi_port_config exynos5440_spi_port_config = { 
	.quirks		= S3C64XX_SPI_QUIRK_POLL,

};



static struct s3c64xx_spi_port_config exynos7_spi_port_config = {

	.fifo_lvl_mask	= { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},

	.rx_lvl_offset	= 15,

	.tx_st_done	= 25,

	.high_speed	= true,

	.clk_from_cmu	= true,

	.quirks		= S3C64XX_SPI_QUIRK_CS_AUTO,

};



static struct platform_device_id s3c64xx_spi_driver_ids[] = {

	{

		.name		= "s3c2443-spi",
@@ -1374,6 +1393,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = { 
	{ .compatible = "samsung,exynos5440-spi",

			.data = (void *)&exynos5440_spi_port_config,

	},

	{ .compatible = "samsung,exynos7-spi",

			.data = (void *)&exynos7_spi_port_config,

	},

	{ },

};

MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);