C++ (Cpp) ath79_spi_wr Examples

Example #1

File: spi-ath79.c Project: ManCheol/kernel

static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
	int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;

	if (is_active) {
		/* set initial clock polarity */
		if (spi->mode & SPI_CPOL)
			sp->ioc_base |= AR71XX_SPI_IOC_CLK;
		else
			sp->ioc_base &= ~AR71XX_SPI_IOC_CLK;

		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
	}

	if (spi->chip_select) {
		struct ath79_spi_controller_data *cdata = spi->controller_data;

		/* SPI is normally active-low */
		gpio_set_value(cdata->gpio, cs_high);
	} else {
		if (cs_high)
			sp->ioc_base |= AR71XX_SPI_IOC_CS0;
		else
			sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;

		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
	}

}

Example #2

File: spi-ath79.c Project: ManCheol/kernel

static void ath79_spi_disable(struct ath79_spi *sp)
{
	/* restore CTRL register */
	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
	/* disable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}

Example #3

File: spi-ath79.c Project: ManCheol/kernel

static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs,
			       u32 word, u8 bits)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
	u32 ioc = sp->ioc_base;

	/* clock starts at inactive polarity */
	for (word <<= (32 - bits); likely(bits); bits--) {
		u32 out;

		if (word & (1 << 31))
			out = ioc | AR71XX_SPI_IOC_DO;
		else
			out = ioc & ~AR71XX_SPI_IOC_DO;

		/* setup MSB (to slave) on trailing edge */
		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out);
		ath79_spi_delay(sp, nsecs);
		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK);
		ath79_spi_delay(sp, nsecs);
		if (bits == 1)
			ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out);

		word <<= 1;
	}

	return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
}

Example #4

File: spi-ath79.c Project: robacklin/uclinux-linux

static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
	int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;
	struct ath79_spi_controller_data *cdata = spi->controller_data;

	if (is_active) {
		/* set initial clock polarity */
		if (spi->mode & SPI_CPOL)
			sp->ioc_base |= AR71XX_SPI_IOC_CLK;
		else
			sp->ioc_base &= ~AR71XX_SPI_IOC_CLK;

		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
	}

	switch (cdata->cs_type) {
	case ATH79_SPI_CS_TYPE_INTERNAL:
		if (cs_high)
			sp->ioc_base |= AR71XX_SPI_IOC_CS(cdata->cs_line);
		else
			sp->ioc_base &= ~AR71XX_SPI_IOC_CS(cdata->cs_line);

		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
		break;

	case ATH79_SPI_CS_TYPE_GPIO:
		/* SPI is normally active-low */
		gpio_set_value(cdata->cs_line, cs_high);
		break;
	}
}

Example #5

File: spi-ath79.c Project: ManCheol/kernel

static void ath79_spi_enable(struct ath79_spi *sp)
{
	/* enable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);

	/* save CTRL register */
	sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
	sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);

	/* TODO: setup speed? */
	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
}

Example #6

File: spi-ath79.c Project: GerardGarcia/linux

static void ath79_spi_cleanup_cs(struct spi_device *spi)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);

	if (spi->chip_select) {
		struct ath79_spi_controller_data *cdata = spi->controller_data;
		gpio_free(cdata->gpio);
	}

	/* restore CTRL register */
	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
	/* disable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}

Example #7

File: spi-ath79.c Project: DenisLug/mptcp

static int ath79_spi_setup_cs(struct spi_device *spi)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
	int status;

	if (spi->chip_select && !gpio_is_valid(spi->cs_gpio))
		return -EINVAL;

	status = 0;
	if (spi->chip_select) {
		unsigned long flags;

		flags = GPIOF_DIR_OUT;
		if (spi->mode & SPI_CS_HIGH)
			flags |= GPIOF_INIT_LOW;
		else
			flags |= GPIOF_INIT_HIGH;

		status = gpio_request_one(spi->cs_gpio, flags,
					  dev_name(&spi->dev));
	} else {
		if (spi->mode & SPI_CS_HIGH)
			sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
		else
			sp->ioc_base |= AR71XX_SPI_IOC_CS0;

		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
	}

	return status;
}

Example #8

File: spi-ath79.c Project: robacklin/uclinux-linux

static int ath79_spi_do_read_flash_data(struct spi_device *spi,
					struct spi_transfer *t)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);

	/* disable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);

	memcpy_fromio(t->rx_buf, sp->base + sp->read_addr, t->len);

	/* enable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);

	/* restore IOC register */
	ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);

	return t->len;
}

Example #9

File: spi-ath79.c Project: GerardGarcia/linux

static int ath79_spi_setup_cs(struct spi_device *spi)
{
	struct ath79_spi *sp = ath79_spidev_to_sp(spi);
	struct ath79_spi_controller_data *cdata;

	cdata = spi->controller_data;
	if (spi->chip_select && !cdata)
		return -EINVAL;

	/* enable GPIO mode */
	ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);

	/* save CTRL register */
	sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
	sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);

	/* TODO: setup speed? */
	ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);

	if (spi->chip_select) {
		int status = 0;

		status = gpio_request(cdata->gpio, dev_name(&spi->dev));
		if (status)
			return status;

		status = gpio_direction_output(cdata->gpio,
					       spi->mode & SPI_CS_HIGH);
		if (status) {
			gpio_free(cdata->gpio);
			return status;
		}
	} else {
		if (spi->mode & SPI_CS_HIGH)
			sp->ioc_base |= AR71XX_SPI_IOC_CS0;
		else
			sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
	}

	return 0;
}