Date:   Fri, 26 Aug 2022 13:57:21 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com, dg@...ix.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, j.zink@...gutronix.de
Cc:     linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, system@...rotek.ru,
        kernel@...gutronix.de
Subject: Re: [PATCH v8 1/2] fpga: lattice-sysconfig-spi: add Lattice
 sysCONFIG FPGA manager

On Thu, Aug 25, 2022 at 02:24:32PM +0300, Ivan Bornyakov wrote:
> Add support to the FPGA manager for programming Lattice ECP5 and MachXO2
> FPGAs over slave SPI sysCONFIG interface.
> 
> Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
> ---
>  drivers/fpga/Kconfig                 |   7 +
>  drivers/fpga/Makefile                |   1 +
>  drivers/fpga/lattice-sysconfig-spi.c | 630 +++++++++++++++++++++++++++
>  3 files changed, 638 insertions(+)
>  create mode 100644 drivers/fpga/lattice-sysconfig-spi.c
> 
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 6c416955da53..991d9d976dca 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -263,4 +263,11 @@ config FPGA_MGR_MICROCHIP_SPI
>  	  programming over slave SPI interface with .dat formatted
>  	  bitstream image.
>  
> +config FPGA_MGR_LATTICE_SPI
> +	tristate "Lattice sysCONFIG SPI FPGA manager"
> +	depends on SPI
> +	help
> +	  FPGA manager driver support for Lattice FPGAs programming over slave
> +	  SPI sysCONFIG interface.
> +
>  endif # FPGA
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 42ae8b58abce..115dba916024 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
>  obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA)	+= zynqmp-fpga.o
>  obj-$(CONFIG_FPGA_MGR_VERSAL_FPGA)	+= versal-fpga.o
>  obj-$(CONFIG_FPGA_MGR_MICROCHIP_SPI)	+= microchip-spi.o
> +obj-$(CONFIG_FPGA_MGR_LATTICE_SPI)	+= lattice-sysconfig-spi.o
>  obj-$(CONFIG_ALTERA_PR_IP_CORE)		+= altera-pr-ip-core.o
>  obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)	+= altera-pr-ip-core-plat.o
>  
> diff --git a/drivers/fpga/lattice-sysconfig-spi.c b/drivers/fpga/lattice-sysconfig-spi.c
> new file mode 100644
> index 000000000000..145b5b27b88d
> --- /dev/null
> +++ b/drivers/fpga/lattice-sysconfig-spi.c
> @@ -0,0 +1,630 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lattice FPGA programming over slave SPI sysCONFIG interface.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/of_device.h>
> +#include <linux/spi/spi.h>
> +
> +#define	SYSCONFIG_ISC_ENABLE		{0xC6, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_ISC_DISABLE		{0x26, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_ISC_ERASE		{0x0E, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_ISC_PROGRAM_DONE	{0x5E, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_READ_STATUS	{0x3C, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_CHECK_BUSY	{0xF0, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_REFRESH		{0x79, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_INIT_ADDR		{0x46, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_BITSTREAM_BURST	{0x7a, 0x00, 0x00, 0x00}
> +#define	SYSCONFIG_LSC_PROG_INCR_NV	{0x70, 0x00, 0x00, 0x01}
> +
> +#define	SYSCONFIG_STATUS_DONE		BIT(8)
> +#define	SYSCONFIG_STATUS_BUSY		BIT(12)
> +#define	SYSCONFIG_STATUS_FAIL		BIT(13)
> +#define	SYSCONFIG_STATUS_ERR		(BIT(23) | BIT(24) | BIT(25))
> +
> +#define	SYSCONFIG_POLL_RETRIES		100000
> +
> +#define	ECP5_SPI_MAX_SPEED_HZ		60000000
> +#define	ECP5_ISC_ERASE_OPERAND		0x01
> +
> +#define	MACHXO2_SPI_MAX_SPEED_HZ	66000000
> +#define	MACHXO2_PAGE_SIZE		16
> +#define	MACHXO2_ISC_ENABLE_OPERAND	0x08
> +#define	MACHXO2_ISC_ERASE_OPERAND	0x04
> +
> +struct sysconfig_priv {
> +	struct gpio_desc *program;
> +	struct gpio_desc *init;
> +	struct gpio_desc *done;
> +	struct spi_device *spi;
> +	u8 isc_enable_operand;
> +	u8 isc_erase_operand;
> +};

As Johannes Zink working on adding I2C to MachXO2, I am thinking how
about we add to struct sysconfig_priv a callback

int (*sysconfig_transfer)(struct sysconfig_priv,
			  const void *tx_buf, size_t tx_len,
			  void *rx_buf, size_t rx_len)

For SPI it would be defined like this:

static int sysconfig_spi_transfer(struct sysconfig_priv *data,
				  const void *tx_buf, size_t tx_len,
				  void *rx_buf, size_t rx_len)
{
	if (!rx_buf)
		return spi_write(data->spi, tx_buf, tx_size);
	
	return spi_write_then_read(data->spi, tx_buf, tx_size, rx_buf, rx_size);
}

And later in sysconfig_ commands we would call this callback.

Would it be a good enough starting base for Johannes to add I2C interface
for MachXO2?

> +
> +static int sysconfig_poll_busy(struct sysconfig_priv *data)
> +{
> +	const u8 lsc_check_busy[] = SYSCONFIG_LSC_CHECK_BUSY;
> +	int ret, retries = SYSCONFIG_POLL_RETRIES;
> +	u8 busy;
> +
> +	while (retries--) {
> +		ret = spi_write_then_read(data->spi,
> +					  lsc_check_busy, sizeof(lsc_check_busy),
> +					  &busy, sizeof(busy));
> +		if (ret)
> +			return ret;
> +
> +		if (!busy)
> +			return 0;
> +
> +		usleep_range(50, 100);
> +	}
> +
> +	return -EBUSY;
> +}
> +
> +static int sysconfig_read_status(struct sysconfig_priv *data, u32 *status)
> +{
> +	const u8 lsc_read_status[] = SYSCONFIG_LSC_READ_STATUS;
> +	__be32 device_status;
> +	int ret;
> +
> +	ret = spi_write_then_read(data->spi,
> +				  lsc_read_status, sizeof(lsc_read_status),
> +				  &device_status, sizeof(device_status));
> +	if (ret)
> +		return ret;
> +
> +	*status = be32_to_cpu(device_status);
> +
> +	return 0;
> +}
> +
> +static int sysconfig_poll_status(struct sysconfig_priv *data, u32 *status)
> +{
> +	int ret;
> +
> +	ret = sysconfig_poll_busy(data);
> +	if (ret)
> +		return ret;
> +
> +	return sysconfig_read_status(data, status);
> +}
> +
> +static int sysconfig_poll_gpio(struct gpio_desc *gpio, bool is_active)
> +{
> +	int value, retries = SYSCONFIG_POLL_RETRIES;
> +
> +	while (retries--) {
> +		value = gpiod_get_value(gpio);
> +		if (value < 0)
> +			return value;
> +
> +		if ((!is_active && !value) || (is_active && value))
> +			return 0;
> +
> +		ndelay(10);
> +	}
> +
> +	return -ETIMEDOUT;
> +}
> +
> +static int sysconfig_refresh(struct sysconfig_priv *data)
> +{
> +	static const u8 lsc_refresh[] = SYSCONFIG_LSC_REFRESH;
> +	int ret;
> +
> +	ret = spi_write(data->spi, lsc_refresh, sizeof(lsc_refresh));
> +	if (ret)
> +		return ret;
> +
> +	usleep_range(4000, 8000);
> +
> +	return 0;
> +}
> +
> +static int sysconfig_isc_enable(struct sysconfig_priv *data)
> +{
> +	u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
> +	u32 status;
> +	int ret;
> +
> +	isc_enable[1] = data->isc_enable_operand;
> +
> +	ret = spi_write(data->spi, isc_enable, sizeof(isc_enable));
> +	if (ret)
> +		return ret;
> +
> +	ret = sysconfig_poll_status(data, &status);
> +	if (ret || (status & SYSCONFIG_STATUS_FAIL))
> +		return ret ? : -EFAULT;
> +
> +	return 0;
> +}

Quirks for I2C enable and refresh commands are 3-bytes instead of
4-bytes for SPI can be added here. Just check which of data->spi or
data->i2c is not NULL.

> +
> +static int sysconfig_isc_erase(struct sysconfig_priv *data)
> +{
> +	u8 isc_erase[] = SYSCONFIG_ISC_ERASE;
> +	u32 status;
> +	int ret;
> +
> +	isc_erase[1] = data->isc_erase_operand;
> +
> +	ret = spi_write(data->spi, isc_erase, sizeof(isc_erase));
> +	if (ret)
> +		return ret;
> +
> +	ret = sysconfig_poll_status(data, &status);
> +	if (ret || (status & SYSCONFIG_STATUS_FAIL))
> +		return ret ? : -EFAULT;
> +
> +	return 0;
> +}
> +
> +static int sysconfig_isc_init(struct sysconfig_priv *data)
> +{
> +	int ret;
> +
> +	ret = sysconfig_isc_enable(data);
> +	if (ret)
> +		return ret;
> +
> +	return sysconfig_isc_erase(data);
> +}
> +
> +static int sysconfig_lsc_init_addr(struct sysconfig_priv *data)
> +{
> +	const u8 lsc_init_addr[] = SYSCONFIG_LSC_INIT_ADDR;
> +
> +	return spi_write(data->spi, lsc_init_addr, sizeof(lsc_init_addr));
> +}
> +
> +static int sysconfig_lsc_bitstream_burst(struct sysconfig_priv *data)
> +{
> +	const u8 lsc_bitstream_burst[] = SYSCONFIG_LSC_BITSTREAM_BURST;
> +	struct spi_transfer xfer = {
> +		.tx_buf = lsc_bitstream_burst,
> +		.len = sizeof(lsc_bitstream_burst),
> +		.cs_change = 1,
> +	};
> +	struct spi_message msg;
> +
> +	spi_message_init_with_transfers(&msg, &xfer, 1);
> +
> +	return spi_sync_locked(data->spi, &msg);
> +}
> +
> +static int sysconfig_isc_prog_done(struct sysconfig_priv *data)
> +{
> +	const u8 isc_prog_done[] = SYSCONFIG_ISC_PROGRAM_DONE;
> +	u32 status;
> +	int ret;
> +
> +	ret = spi_write(data->spi, isc_prog_done, sizeof(isc_prog_done));
> +	if (ret)
> +		return ret;
> +
> +	ret = sysconfig_poll_status(data, &status);
> +	if (ret)
> +		return ret;
> +
> +	if (status & SYSCONFIG_STATUS_DONE)
> +		return 0;
> +
> +	return -EFAULT;
> +}
> +
> +static int sysconfig_isc_disable(struct sysconfig_priv *data)
> +{
> +	const u8 isc_disable[] = SYSCONFIG_ISC_DISABLE;
> +
> +	return spi_write(data->spi, isc_disable, sizeof(isc_disable));
> +}
> +
> +static enum fpga_mgr_states ecp5_ops_state(struct fpga_manager *mgr)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +
> +	return (gpiod_get_value(priv->done) > 0) ? FPGA_MGR_STATE_OPERATING :
> +						   FPGA_MGR_STATE_UNKNOWN;
> +}
> +
> +static int ecp5_ops_write_init(struct fpga_manager *mgr,
> +			       struct fpga_image_info *info,
> +			       const char *buf, size_t count)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct spi_device *spi = priv->spi;
> +	struct device *dev = &mgr->dev;
> +	struct gpio_desc *program;
> +	struct gpio_desc *init;
> +	struct gpio_desc *done;
> +	int ret;
> +
> +	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
> +		dev_err(dev, "Partial reconfiguration is not supported\n");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	program = priv->program;
> +	init = priv->init;
> +	done = priv->done;
> +
> +	/* Enter init mode */
> +	gpiod_set_value(program, 1);
> +
> +	ret = sysconfig_poll_gpio(init, true);
> +	if (!ret)
> +		ret = sysconfig_poll_gpio(done, false);
> +
> +	if (ret) {
> +		dev_err(dev, "Failed to go to init mode\n");
> +		return ret;
> +	}
> +
> +	/* Enter program mode */
> +	gpiod_set_value(program, 0);
> +
> +	ret = sysconfig_poll_gpio(init, false);
> +	if (ret) {
> +		dev_err(dev, "Failed to go to program mode\n");
> +		return ret;
> +	}
> +
> +	/* Enter ISC mode */
> +	ret = sysconfig_isc_init(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to go to ISC mode\n");
> +		return ret;
> +	}
> +
> +	/* Initialize the Address Shift Register */
> +	ret = sysconfig_lsc_init_addr(priv);
> +	if (ret) {
> +		dev_err(dev,
> +			"Failed to initialize the Address Shift Register\n");
> +		return ret;
> +	}
> +
> +	/*
> +	 * Lock SPI bus for exclusive usage until FPGA programming is done.
> +	 * SPI bus will be released in ecp5_ops_write_complete() or on error.
> +	 */
> +	spi_bus_lock(spi->controller);
> +
> +	/* Prepare for bitstream burst write */
> +	ret = sysconfig_lsc_bitstream_burst(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to prepare for bitstream burst write\n");
> +		spi_bus_unlock(spi->controller);
> +	}
> +
> +	return ret;
> +}
> +
> +static int ecp5_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct spi_device *spi = priv->spi;
> +	struct spi_transfer xfer = {
> +		.tx_buf = buf,
> +		.len = count,
> +		.cs_change = 1,
> +	};
> +	struct spi_message msg;
> +	int ret;
> +
> +	spi_message_init_with_transfers(&msg, &xfer, 1);
> +	ret = spi_sync_locked(spi, &msg);
> +	if (ret)
> +		spi_bus_unlock(spi->controller);
> +
> +	return ret;
> +}
> +
> +static int ecp5_ops_write_complete(struct fpga_manager *mgr,
> +				   struct fpga_image_info *info)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct spi_device *spi = priv->spi;
> +	struct device *dev = &mgr->dev;
> +	int ret;
> +
> +	/* Bitstream burst write is done, release SPI bus */
> +	spi_bus_unlock(spi->controller);
> +
> +	/* Toggle CS and wait for bitstream write to finish */
> +	ret = spi_write(spi, NULL, 0);
> +	if (!ret)
> +		ret = sysconfig_poll_busy(priv);
> +
> +	if (ret) {
> +		dev_err(dev, "Error while waiting bitstream write to finish\n");
> +		return ret;
> +	}
> +
> +	/* Exit ISC mode */
> +	ret = sysconfig_isc_disable(priv);
> +	if (!ret)
> +		ret = sysconfig_poll_gpio(priv->done, true);
> +
> +	if (ret)
> +		dev_err(dev, "Failed to finish ISC\n");
> +
> +	return ret;
> +}
> +
> +static const struct fpga_manager_ops ecp5_fpga_ops = {
> +	.state = ecp5_ops_state,
> +	.write_init = ecp5_ops_write_init,
> +	.write = ecp5_ops_write,
> +	.write_complete = ecp5_ops_write_complete,
> +};
> +
> +static int ecp5_probe(struct sysconfig_priv *priv)
> +{
> +	struct spi_device *spi = priv->spi;
> +	struct device *dev = &spi->dev;
> +	struct fpga_manager *mgr;
> +	int ret;
> +
> +	if (spi->max_speed_hz > ECP5_SPI_MAX_SPEED_HZ) {
> +		dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",
> +			spi->max_speed_hz, ECP5_SPI_MAX_SPEED_HZ);
> +		return -EINVAL;
> +	}
> +
> +	priv->isc_erase_operand = ECP5_ISC_ERASE_OPERAND;
> +
> +	priv->done = devm_gpiod_get(dev, "done", GPIOD_IN);
> +	if (IS_ERR(priv->done)) {
> +		ret = PTR_ERR(priv->done);
> +		dev_err(dev, "Failed to get DONE GPIO: %d\n", ret);
> +		return ret;
> +	}
> +
> +	priv->init = devm_gpiod_get(dev, "init", GPIOD_IN);
> +	if (IS_ERR(priv->init)) {
> +		ret = PTR_ERR(priv->init);
> +		dev_err(dev, "Failed to get INIT GPIO: %d\n", ret);
> +		return ret;
> +	}
> +
> +	priv->program = devm_gpiod_get(dev, "program", GPIOD_OUT_LOW);
> +	if (IS_ERR(priv->program)) {
> +		ret = PTR_ERR(priv->program);
> +		dev_err(dev, "Failed to get PROGRAM GPIO: %d\n", ret);
> +		return ret;
> +	}
> +
> +	mgr = devm_fpga_mgr_register(dev, "Lattice ECP5 SPI FPGA Manager",
> +				     &ecp5_fpga_ops, priv);
> +
> +	return PTR_ERR_OR_ZERO(mgr);
> +}
> +
> +static enum fpga_mgr_states machxo2_ops_state(struct fpga_manager *mgr)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +	u32 status;
> +	int ret;
> +
> +	ret = sysconfig_read_status(priv, &status);
> +	if (ret || !(status & SYSCONFIG_STATUS_DONE))
> +		return FPGA_MGR_STATE_UNKNOWN;
> +
> +	return FPGA_MGR_STATE_OPERATING;
> +}
> +
> +static int machxo2_ops_write_init(struct fpga_manager *mgr,
> +				  struct fpga_image_info *info,
> +				  const char *buf, size_t count)
> +{
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct device *dev = &mgr->dev;
> +	int ret;
> +
> +	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
> +		dev_err(dev, "Partial reconfiguration is not supported\n");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	/* Enter ISC mode */
> +	ret = sysconfig_isc_init(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to go to ISC mode\n");
> +		return ret;
> +	}
> +
> +	/* Initialize the Address Shift Register */
> +	ret = sysconfig_lsc_init_addr(priv);
> +	if (ret)
> +		dev_err(dev,
> +			"Failed to initialize the Address Shift Register\n");
> +
> +	return ret;
> +}
> +
> +static int machxo2_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
> +{
> +	const u8 lsc_progincr[] = SYSCONFIG_LSC_PROG_INCR_NV;
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct device *dev = &mgr->dev;
> +	struct spi_transfer xfers[2] = {
> +		{
> +			.tx_buf = lsc_progincr,
> +			.len = sizeof(lsc_progincr),
> +		}, {
> +			.len = MACHXO2_PAGE_SIZE,
> +		},
> +	};
> +	size_t i;
> +	int ret;
> +
> +	if (count % MACHXO2_PAGE_SIZE) {
> +		dev_err(dev, "Malformed payload.\n");
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < count; i += MACHXO2_PAGE_SIZE) {
> +		xfers[1].tx_buf = buf + i;
> +
> +		ret = spi_sync_transfer(priv->spi, xfers, 2);
> +		if (!ret)
> +			ret = sysconfig_poll_busy(priv);
> +
> +		if (ret) {
> +			dev_err(dev, "Failed to write frame %zu of %zu\n",
> +				i / MACHXO2_PAGE_SIZE, count / MACHXO2_PAGE_SIZE);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void machxo2_cleanup(struct sysconfig_priv *data)
> +{
> +	sysconfig_isc_erase(data);
> +	sysconfig_refresh(data);
> +}
> +
> +static int machxo2_ops_write_complete(struct fpga_manager *mgr,
> +				      struct fpga_image_info *info)
> +{
> +	int ret, retries = SYSCONFIG_POLL_RETRIES;
> +	struct sysconfig_priv *priv = mgr->priv;
> +	struct device *dev = &mgr->dev;
> +	u32 status;
> +
> +	ret = sysconfig_isc_prog_done(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable Self-Download Mode\n");
> +		goto fail;
> +	}
> +
> +	ret = sysconfig_isc_disable(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to disable Configuration Interface\n");
> +		goto fail;
> +	}
> +
> +	while (retries--) {
> +		ret = sysconfig_refresh(priv);
> +		if (!ret)
> +			ret = sysconfig_read_status(priv, &status);
> +
> +		if (ret) {
> +			dev_err(dev, "Failed to refresh\n");
> +			break;
> +		}
> +
> +		if (status & SYSCONFIG_STATUS_DONE &&
> +		    !(status & SYSCONFIG_STATUS_BUSY) &&
> +		    !(status & SYSCONFIG_STATUS_ERR))
> +			return 0;
> +	}
> +
> +fail:
> +	machxo2_cleanup(priv);
> +
> +	return -EFAULT;
> +}
> +
> +static const struct fpga_manager_ops machxo2_fpga_ops = {
> +	.state = machxo2_ops_state,
> +	.write_init = machxo2_ops_write_init,
> +	.write = machxo2_ops_write,
> +	.write_complete = machxo2_ops_write_complete,
> +};
> +
> +static int machxo2_probe(struct sysconfig_priv *priv)
> +{
> +	struct spi_device *spi = priv->spi;
> +	struct device *dev = &spi->dev;
> +	struct fpga_manager *mgr;
> +
> +	if (spi->max_speed_hz > MACHXO2_SPI_MAX_SPEED_HZ) {
> +		dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",
> +			spi->max_speed_hz, MACHXO2_SPI_MAX_SPEED_HZ);
> +		return -EINVAL;
> +	}
> +
> +	priv->isc_enable_operand = MACHXO2_ISC_ENABLE_OPERAND;
> +	priv->isc_erase_operand = MACHXO2_ISC_ERASE_OPERAND;
> +
> +	mgr = devm_fpga_mgr_register(dev, "Lattice MachXO2 SPI FPGA Manager",
> +				     &machxo2_fpga_ops, priv);
> +
> +	return PTR_ERR_OR_ZERO(mgr);
> +}
> +
> +typedef int (*lattice_fpga_probe_func)(struct sysconfig_priv *);
> +
> +static int sysconfig_probe(struct spi_device *spi)
> +{
> +	const struct spi_device_id *dev_id;
> +	lattice_fpga_probe_func probe_func;
> +	struct device *dev = &spi->dev;
> +	struct sysconfig_priv *priv;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->spi = spi;
> +
> +	probe_func = of_device_get_match_data(&spi->dev);
> +	if (!probe_func) {
> +		dev_id = spi_get_device_id(spi);
> +		if (!dev_id)
> +			return -ENODEV;
> +
> +		probe_func = (lattice_fpga_probe_func)dev_id->driver_data;
> +	}
> +
> +	if (!probe_func)
> +		return -EINVAL;
> +
> +	return probe_func(priv);
> +}
> +
> +static const struct spi_device_id sysconfig_spi_ids[] = {
> +	{
> +		.name = "ecp5-fpga-mgr",
> +		.driver_data = (kernel_ulong_t)ecp5_probe,
> +	}, {
> +		.name = "machxo2-fpga-mgr",
> +		.driver_data = (kernel_ulong_t)machxo2_probe,
> +	}, {},
> +};
> +MODULE_DEVICE_TABLE(spi, sysconfig_spi_ids);
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id sysconfig_of_ids[] = {
> +	{
> +		.compatible = "lattice,ecp5-fpga-mgr",
> +		.data = ecp5_probe,
> +	}, {
> +		.compatible = "lattice,machxo2-fpga-mgr",
> +		.data = machxo2_probe
> +	}, {},
> +};
> +MODULE_DEVICE_TABLE(of, sysconfig_of_ids);
> +#endif /* IS_ENABLED(CONFIG_OF) */
> +
> +static struct spi_driver lattice_sysconfig_driver = {
> +	.probe = sysconfig_probe,
> +	.id_table = sysconfig_spi_ids,
> +	.driver = {
> +		.name = "lattice_sysconfig_spi_fpga_mgr",
> +		.of_match_table = of_match_ptr(sysconfig_of_ids),
> +	},
> +};
> +
> +module_spi_driver(lattice_sysconfig_driver);
> +
> +MODULE_DESCRIPTION("Lattice sysCONFIG Slave SPI FPGA Manager");
> +MODULE_LICENSE("GPL");
> -- 
> 2.37.2
> 

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