C++ (Cpp) cadence_qspi_apb_chipselect Examples

Example #1

File: spi-cadence-qspi-apb.c Project: scshepard/terasic_MTL

void cadence_qspi_switch_cs(struct struct_cqspi *cadence_qspi,
	unsigned int cs)
{
	unsigned int reg;
	struct platform_device *pdev = cadence_qspi->pdev;
	struct cqspi_platform_data *pdata = pdev->dev.platform_data;
	struct cqspi_flash_pdata *f_pdata = &(pdata->f_pdata[cs]);
	void __iomem *iobase = cadence_qspi->iobase;

	pr_debug("%s\n", __func__);
	cadence_qspi_apb_controller_disable(iobase);

	/* Configure page size and block size. */
	reg = CQSPI_READL(iobase + CQSPI_REG_SIZE);
	/* clear the previous value */
	reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
	reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
	reg |= (f_pdata->page_size << CQSPI_REG_SIZE_PAGE_LSB);
	reg |= (f_pdata->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
	CQSPI_WRITEL(reg, iobase + CQSPI_REG_SIZE);

	/* configure the chip select */
	cadence_qspi_apb_chipselect (iobase, cs, pdata->ext_decoder);
	cadence_qspi_apb_controller_enable(iobase);
	return;
}

Example #2

File: cadence_qspi.c Project: CheezeCake/edison-u-boot

static int cadence_spi_xfer(struct udevice *dev, unsigned int bitlen,
			    const void *dout, void *din, unsigned long flags)
{
	struct udevice *bus = dev->parent;
	struct cadence_spi_platdata *plat = bus->platdata;
	struct cadence_spi_priv *priv = dev_get_priv(bus);
	void *base = priv->regbase;
	u8 *cmd_buf = priv->cmd_buf;
	size_t data_bytes;
	int err = 0;
	u32 mode = CQSPI_STIG_WRITE;

	if (flags & SPI_XFER_BEGIN) {
		/* copy command to local buffer */
		priv->cmd_len = bitlen / 8;
		memcpy(cmd_buf, dout, priv->cmd_len);
	}

	if (flags == (SPI_XFER_BEGIN | SPI_XFER_END)) {
		/* if start and end bit are set, the data bytes is 0. */
		data_bytes = 0;
	} else {
		data_bytes = bitlen / 8;
	}
	debug("%s: len=%d [bytes]\n", __func__, data_bytes);

	/* Set Chip select */
	cadence_qspi_apb_chipselect(base, spi_chip_select(dev),
				    CONFIG_CQSPI_DECODER);

	if ((flags & SPI_XFER_END) || (flags == 0)) {
		if (priv->cmd_len == 0) {
			printf("QSPI: Error, command is empty.\n");
			return -1;
		}

		if (din && data_bytes) {
			/* read */
			/* Use STIG if no address. */
			if (!CQSPI_IS_ADDR(priv->cmd_len))
				mode = CQSPI_STIG_READ;
			else
				mode = CQSPI_INDIRECT_READ;
		} else if (dout && !(flags & SPI_XFER_BEGIN)) {
			/* write */
			if (!CQSPI_IS_ADDR(priv->cmd_len))
				mode = CQSPI_STIG_WRITE;
			else
				mode = CQSPI_INDIRECT_WRITE;
		}

		switch (mode) {
		case CQSPI_STIG_READ:
			err = cadence_qspi_apb_command_read(
				base, priv->cmd_len, cmd_buf,
				data_bytes, din);

		break;
		case CQSPI_STIG_WRITE:
			err = cadence_qspi_apb_command_write(base,
				priv->cmd_len, cmd_buf,
				data_bytes, dout);
		break;
		case CQSPI_INDIRECT_READ:
			err = cadence_qspi_apb_indirect_read_setup(plat,
				priv->cmd_len, cmd_buf);
			if (!err) {
				err = cadence_qspi_apb_indirect_read_execute
				(plat, data_bytes, din);
			}
		break;
		case CQSPI_INDIRECT_WRITE:
			err = cadence_qspi_apb_indirect_write_setup
				(plat, priv->cmd_len, cmd_buf);
			if (!err) {
				err = cadence_qspi_apb_indirect_write_execute
				(plat, data_bytes, dout);
			}
		break;
		default:
			err = -1;
			break;
		}

		if (flags & SPI_XFER_END) {
			/* clear command buffer */
			memset(cmd_buf, 0, sizeof(priv->cmd_buf));
			priv->cmd_len = 0;
		}
	}

	return err;
}