On 2022-09-13 at 16:07:13 +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@xxxxxxxxxxx>
> ---
> drivers/fpga/Kconfig | 7 +
> drivers/fpga/Makefile | 3 +
> drivers/fpga/sysconfig-spi.c | 210 ++++++++++++++
> drivers/fpga/sysconfig.c | 528 +++++++++++++++++++++++++++++++++++
> drivers/fpga/sysconfig.h | 62 ++++
> 5 files changed, 810 insertions(+)
> create mode 100644 drivers/fpga/sysconfig-spi.c
> create mode 100644 drivers/fpga/sysconfig.c
> create mode 100644 drivers/fpga/sysconfig.h
>
> 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..70e5f58d0c10 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -20,9 +20,12 @@ 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-$(CONFIG_ALTERA_PR_IP_CORE_PLAT) += altera-pr-ip-core-plat.o
>
> +lattice-sysconfig-spi-objs := sysconfig-spi.o sysconfig.o
What's your plan if sysconfig-i2c is to be added?
There are many examples in kernel actually, is it better like the
following:
obj-$(CONFIG_FPGA_MGR_LATTICE_SYSCONFIG) += lattice-sysconfig.o
obj-$(CONFIG_LATTICE_SYSCONFIG_SPI) += lattice-sysconfig-spi.o
> +
> # FPGA Secure Update Drivers
> obj-$(CONFIG_FPGA_M10_BMC_SEC_UPDATE) += intel-m10-bmc-sec-update.o
>
> diff --git a/drivers/fpga/sysconfig-spi.c b/drivers/fpga/sysconfig-spi.c
> new file mode 100644
> index 000000000000..e2c71bc3b674
> --- /dev/null
> +++ b/drivers/fpga/sysconfig-spi.c
> @@ -0,0 +1,210 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lattice FPGA programming over slave SPI sysCONFIG interface.
> + */
> +
> +#include <linux/of_device.h>
> +#include <linux/spi/spi.h>
> +
> +#include "sysconfig.h"
> +
> +struct sysconfig_spi_fpga_priv {
> + const struct sysconfig_fpga_priv *fpga_priv;
> + u32 max_speed_hz;
> +};
> +
> +static const struct sysconfig_spi_fpga_priv ecp5_spi_data = {
> + .fpga_priv = &ecp5_data,
> + .max_speed_hz = 60000000,
> +};
> +
> +static const struct sysconfig_spi_fpga_priv machxo2_spi_data = {
> + .fpga_priv = &machxo2_data,
> + .max_speed_hz = 66000000,
> +};
> +
> +static int sysconfig_spi_cmd_write(struct sysconfig_priv *priv,
> + const void *tx_buf, size_t tx_len)
> +{
> + struct spi_device *spi = to_spi_device(priv->dev);
> +
> + if (!spi)
> + return -ENODEV;
Any reason to check it everytime? The driver should make sure it is
properly initialized on probe, is it?
> +
> + return spi_write(spi, tx_buf, tx_len);
> +}
> +
> +static int sysconfig_spi_cmd_write_with_data(struct sysconfig_priv *priv,
> + const void *cmd, size_t cmd_len,
> + const void *data, size_t data_len)
I think the 2 write callbacks could be combined and named
sysconfig_spi_cmd_write()
> +{
> + struct spi_device *spi = to_spi_device(priv->dev);
> + struct spi_transfer xfers[2] = {
> + {
> + .tx_buf = cmd,
> + .len = cmd_len,
> + }, {
> + .tx_buf = data,
> + .len = data_len,
> + },
> + };
> +
> + if (!spi)
> + return -ENODEV;
> +
> + return spi_sync_transfer(spi, xfers, 2);
> +}
> +
> +static int sysconfig_spi_cmd_write_then_read(struct sysconfig_priv *priv,
> + const void *tx_buf, size_t tx_len,
> + void *rx_buf, size_t rx_len)
Maybe just sysconfig_spi_cmd_read(), No matter write or read data, command word
should always be TXed first, so no need to say write here.
> +{
> + struct spi_device *spi = to_spi_device(priv->dev);
> +
> + if (!spi)
> + return -ENODEV;
> +
> + return spi_write_then_read(spi, tx_buf, tx_len, rx_buf, rx_len);
> +}
> +
> +static int sysconfig_spi_lsc_burst_init(struct sysconfig_priv *priv)
Is it better sysconfig_spi_bitstream_burst_init?
By the way, what is LSC & ISC?
> +{
> + const u8 lsc_bitstream_burst[] = SYSCONFIG_LSC_BITSTREAM_BURST;
> + struct spi_device *spi = to_spi_device(priv->dev);
> + struct spi_transfer xfer = {
> + .tx_buf = lsc_bitstream_burst,
> + .len = sizeof(lsc_bitstream_burst),
> + .cs_change = 1,
I'm not sure what's the effect to have cs_change on last transfer, is it to
last cs active to the next message?
> + };
> + struct spi_message msg;
> + int ret;
> +
> + if (!spi)
> + return -ENODEV;
> +
> + spi_message_init_with_transfers(&msg, &xfer, 1);
> +
> + /*
> + * Lock SPI bus for exclusive usage until FPGA programming is done.
> + * SPI bus will be released in sysconfig_spi_lsc_burst_complete().
> + */
> + spi_bus_lock(spi->controller);
> +
> + ret = spi_sync_locked(spi, &msg);
> + if (ret)
> + spi_bus_unlock(spi->controller);
> +
> + return ret;
> +}
> +
> +static int sysconfig_spi_bitstream_burst_write(struct sysconfig_priv *priv,
> + const char *buf, size_t count)
Why 'count', is 'len' better, to aligned with previous callbacks.
> +{
> + struct spi_device *spi = to_spi_device(priv->dev);
> + struct spi_transfer xfer = {
> + .tx_buf = buf,
> + .len = count,
> + .cs_change = 1,
> + };
> + struct spi_message msg;
> +
> + if (!spi)
> + return -ENODEV;
> +
> + spi_message_init_with_transfers(&msg, &xfer, 1);
> +
> + return spi_sync_locked(spi, &msg);
> +}
> +
> +static int sysconfig_spi_lsc_burst_complete(struct sysconfig_priv *priv)
sysconfig_spi_bitstream_burst_complete?
> +{
> + struct spi_device *spi = to_spi_device(priv->dev);
> +
> + if (!spi)
> + return -ENODEV;
> +
> + /* Bitstream burst write is done, release SPI bus */
> + spi_bus_unlock(spi->controller);
> +
> + /* Toggle CS to finish bitstream write */
> + return spi_write(spi, NULL, 0);
> +}
> +
> +static int sysconfig_spi_probe(struct spi_device *spi)
> +{
> + const struct sysconfig_spi_fpga_priv *spi_fpga_priv;
> + const struct spi_device_id *dev_id;
> + struct device *dev = &spi->dev;
> + struct sysconfig_priv *priv;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + spi_fpga_priv = of_device_get_match_data(dev);
> + if (!spi_fpga_priv) {
> + dev_id = spi_get_device_id(spi);
> + if (!dev_id)
> + return -ENODEV;
> +
> + spi_fpga_priv = (const struct sysconfig_spi_fpga_priv *)dev_id->driver_data;
> + }
> +
> + if (!spi_fpga_priv)
> + return -EINVAL;
> +
> + if (spi->max_speed_hz > spi_fpga_priv->max_speed_hz) {
> + dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",
> + spi->max_speed_hz, spi_fpga_priv->max_speed_hz);
> + return -EINVAL;
> + }
> +
> + priv->dev = dev;
> + priv->fpga_priv = spi_fpga_priv->fpga_priv;
> + priv->command_write = sysconfig_spi_cmd_write;
> + priv->command_write_with_data = sysconfig_spi_cmd_write_with_data;
> + priv->command_write_then_read = sysconfig_spi_cmd_write_then_read;
> + priv->bitstream_burst_write_init = sysconfig_spi_lsc_burst_init;
> + priv->bitstream_burst_write = sysconfig_spi_bitstream_burst_write;
> + priv->bitstream_burst_write_complete = sysconfig_spi_lsc_burst_complete;
> +
> + return sysconfig_probe(priv);
> +}
> +
> +static const struct spi_device_id sysconfig_spi_ids[] = {
> + {
> + .name = "sysconfig-ecp5",
> + .driver_data = (kernel_ulong_t)&ecp5_spi_data,
> + }, {
> + .name = "sysconfig-machxo2",
> + .driver_data = (kernel_ulong_t)&machxo2_spi_data,
> + }, {},
> +};
> +MODULE_DEVICE_TABLE(spi, sysconfig_spi_ids);
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id sysconfig_of_ids[] = {
> + {
> + .compatible = "lattice,sysconfig-ecp5",
> + .data = &ecp5_spi_data,
> + }, {
> + .compatible = "lattice,sysconfig-machxo2",
> + .data = &machxo2_spi_data,
> + }, {},
> +};
> +MODULE_DEVICE_TABLE(of, sysconfig_of_ids);
> +#endif /* IS_ENABLED(CONFIG_OF) */
> +
> +static struct spi_driver lattice_sysconfig_driver = {
> + .probe = sysconfig_spi_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");
> diff --git a/drivers/fpga/sysconfig.c b/drivers/fpga/sysconfig.c
> new file mode 100644
> index 000000000000..af697203ed5d
> --- /dev/null
> +++ b/drivers/fpga/sysconfig.c
> @@ -0,0 +1,528 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lattice FPGA sysCONFIG interface functions independent of port type.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/gpio/consumer.h>
> +
> +#include "sysconfig.h"
> +
> +const struct sysconfig_fpga_priv ecp5_data = {
> + .isc_enable_operand = 0x00,
> + .burst_write = true,
> + .internal_flash = false,
Sorry, we still have gaps here.
Machxo2 reprograming can be splitted to 2 steps, flash reprograming &
FPGA reconfiguration from flash, and now I think it is not a good idea
to include the 2 steps in an FPGA manager. Flash reprograming is actually
not the job for FPGA manager, it could be done by other existing
interfaces. And I also don't want to support it in this new driver. FPGA
reconfiguration from flash, as we discussed previously, could be a
FPGA manager feature, but could be considered later.
In another word, only to implement FPGA reconfiguration from bitstream
file, we don't even need to support machxo2 now.
For this sysconfig_fpga_priv, isc_enable_operand & internal_flash are
not need here, they are for flash reprograming actually. burst_write
is the only concern, any finding about whether page write works?
Thanks,
Yilun
> +};
> +
> +const struct sysconfig_fpga_priv machxo2_data = {
> + .isc_enable_operand = 0x08,
> + .burst_write = false,
> + .internal_flash = true,
> +};
> +
> +static int sysconfig_cmd_write(struct sysconfig_priv *priv, const void *buf,
> + size_t buf_len)
> +{
> + return priv->command_write(priv, buf, buf_len);
> +}
> +
> +static int sysconfig_cmd_write_with_data(struct sysconfig_priv *priv,
> + const void *cmd, size_t cmd_len,
> + const void *data, size_t data_len)
> +{
> + return priv->command_write_with_data(priv, cmd, cmd_len, data, data_len);
> +}
> +
> +static int sysconfig_cmd_write_then_read(struct sysconfig_priv *priv,
> + const void *tx_buf, size_t tx_len,
> + void *rx_buf, size_t rx_len)
> +{
> + return priv->command_write_then_read(priv, tx_buf, tx_len, rx_buf, rx_len);
> +}
> +
> +static int sysconfig_read_busy(struct sysconfig_priv *priv)
> +{
> + const u8 lsc_check_busy[] = SYSCONFIG_LSC_CHECK_BUSY;
> + u8 busy;
> + int ret;
> +
> + ret = sysconfig_cmd_write_then_read(priv, lsc_check_busy,
> + sizeof(lsc_check_busy),
> + &busy, sizeof(busy));
> +
> + return ret ? : busy;
> +}
> +
> +static int sysconfig_poll_busy(struct sysconfig_priv *priv)
> +{
> + size_t retries = SYSCONFIG_POLL_RETRIES;
> + int ret;
> +
> + while (retries--) {
> + ret = sysconfig_read_busy(priv);
> + if (ret <= 0)
> + return ret;
> +
> + usleep_range(SYSCONFIG_POLL_INTERVAL_US,
> + SYSCONFIG_POLL_INTERVAL_US * 2);
> + }
> +
> + return -EBUSY;
> +}
> +
> +static int sysconfig_read_status(struct sysconfig_priv *priv, u32 *status)
> +{
> + const u8 lsc_read_status[] = SYSCONFIG_LSC_READ_STATUS;
> + __be32 device_status;
> + int ret;
> +
> + ret = sysconfig_cmd_write_then_read(priv, 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 *priv, u32 *status)
> +{
> + int ret = sysconfig_poll_busy(priv);
> +
> + if (ret)
> + return ret;
> +
> + return sysconfig_read_status(priv, status);
> +}
> +
> +static int sysconfig_poll_gpio(struct gpio_desc *gpio, bool is_active)
> +{
> + size_t retries = SYSCONFIG_POLL_RETRIES;
> + int value;
> +
> + while (retries--) {
> + value = gpiod_get_value(gpio);
> + if (value < 0)
> + return value;
> +
> + if ((is_active && value) || (!is_active && !value))
> + return 0;
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int sysconfig_gpio_refresh(struct sysconfig_priv *priv)
> +{
> + struct gpio_desc *program = priv->program;
> + struct gpio_desc *init = priv->init;
> + struct gpio_desc *done = priv->done;
> + int ret;
> +
> + /* Enter init mode */
> + gpiod_set_value(program, 1);
> +
> + ret = sysconfig_poll_gpio(init, true);
> + if (!ret)
> + ret = sysconfig_poll_gpio(done, false);
> +
> + if (ret)
> + return ret;
> +
> + /* Enter program mode */
> + gpiod_set_value(program, 0);
> +
> + return sysconfig_poll_gpio(init, false);
> +}
> +
> +static int sysconfig_lsc_refresh(struct sysconfig_priv *priv)
> +{
> + static const u8 lsc_refresh[] = SYSCONFIG_LSC_REFRESH;
> + int ret;
> +
> + ret = sysconfig_cmd_write(priv, lsc_refresh, sizeof(lsc_refresh));
> + if (ret)
> + return ret;
> +
> + usleep_range(4000, 8000);
> +
> + return 0;
> +}
> +
> +static int sysconfig_refresh(struct sysconfig_priv *priv)
> +{
> + struct gpio_desc *program = priv->program;
> + struct gpio_desc *init = priv->init;
> + struct gpio_desc *done = priv->done;
> +
> + if (program && init && done)
> + return sysconfig_gpio_refresh(priv);
> +
> + return sysconfig_lsc_refresh(priv);
> +}
> +
> +static int sysconfig_isc_enable(struct sysconfig_priv *priv)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> + u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
> + u32 status;
> + int ret;
> +
> + isc_enable[1] = fpga_priv->isc_enable_operand;
> +
> + ret = sysconfig_cmd_write(priv, isc_enable, sizeof(isc_enable));
> + if (ret)
> + return ret;
> +
> + ret = sysconfig_poll_status(priv, &status);
> + if (ret || (status & SYSCONFIG_STATUS_FAIL))
> + return ret ? : -EFAULT;
> +
> + return 0;
> +}
> +
> +static int sysconfig_isc_erase(struct sysconfig_priv *priv)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> + u8 isc_erase[] = SYSCONFIG_ISC_ERASE;
> + u32 status;
> + int ret;
> +
> + isc_erase[1] = SYSCONFIG_ISC_ERASE_SRAM;
> +
> + if (fpga_priv->internal_flash)
> + isc_erase[1] |= SYSCONFIG_ISC_ERASE_FLASH;
> +
> + ret = sysconfig_cmd_write(priv, isc_erase, sizeof(isc_erase));
> + if (ret)
> + return ret;
> +
> + ret = sysconfig_poll_status(priv, &status);
> + if (ret || (status & SYSCONFIG_STATUS_FAIL))
> + return ret ? : -EFAULT;
> +
> + return 0;
> +}
> +
> +static int sysconfig_isc_init(struct sysconfig_priv *priv)
> +{
> + int ret = sysconfig_isc_enable(priv);
> +
> + if (ret)
> + return ret;
> +
> + return sysconfig_isc_erase(priv);
> +}
> +
> +static int sysconfig_lsc_init_addr(struct sysconfig_priv *priv)
> +{
> + const u8 lsc_init_addr[] = SYSCONFIG_LSC_INIT_ADDR;
> +
> + return sysconfig_cmd_write(priv, lsc_init_addr, sizeof(lsc_init_addr));
> +}
> +
> +static int sysconfig_burst_write_init(struct sysconfig_priv *priv)
> +{
> + if (priv->bitstream_burst_write_init)
> + return priv->bitstream_burst_write_init(priv);
> +
> + return 0;
> +}
> +
> +static int sysconfig_burst_write_complete(struct sysconfig_priv *priv)
> +{
> + if (priv->bitstream_burst_write_complete)
> + return priv->bitstream_burst_write_complete(priv);
> +
> + return 0;
> +}
> +
> +static int sysconfig_bitstream_burst_write(struct sysconfig_priv *priv,
> + const char *buf, size_t count)
> +{
> + int ret;
> +
> + if (priv->bitstream_burst_write)
> + ret = priv->bitstream_burst_write(priv, buf, count);
> + else
> + ret = -EOPNOTSUPP;
> +
> + if (ret)
> + sysconfig_burst_write_complete(priv);
> +
> + return ret;
> +}
> +
> +static int sysconfig_bitstream_paged_write(struct sysconfig_priv *priv,
> + const char *buf, size_t count)
> +{
> + const u8 lsc_progincr[] = SYSCONFIG_LSC_PROG_INCR_NV;
> + size_t i;
> + int ret;
> +
> + if (count % SYSCONFIG_PAGE_SIZE)
> + return -EINVAL;
> +
> + for (i = 0; i < count; i += SYSCONFIG_PAGE_SIZE) {
> + ret = sysconfig_cmd_write_with_data(priv, lsc_progincr,
> + sizeof(lsc_progincr),
> + buf + i, SYSCONFIG_PAGE_SIZE);
> + if (!ret)
> + ret = sysconfig_poll_busy(priv);
> +
> + if (ret)
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static int sysconfig_isc_prog_done(struct sysconfig_priv *priv)
> +{
> + const u8 isc_prog_done[] = SYSCONFIG_ISC_PROGRAM_DONE;
> + u32 status;
> + int ret;
> +
> + ret = sysconfig_cmd_write(priv, isc_prog_done, sizeof(isc_prog_done));
> + if (ret)
> + return ret;
> +
> + ret = sysconfig_poll_status(priv, &status);
> + if (ret)
> + return ret;
> +
> + if (status & SYSCONFIG_STATUS_DONE)
> + return 0;
> +
> + return -EFAULT;
> +}
> +
> +static int sysconfig_isc_disable(struct sysconfig_priv *priv)
> +{
> + const u8 isc_disable[] = SYSCONFIG_ISC_DISABLE;
> +
> + return sysconfig_cmd_write(priv, isc_disable, sizeof(isc_disable));
> +}
> +
> +static void sysconfig_cleanup(struct sysconfig_priv *priv)
> +{
> + sysconfig_isc_erase(priv);
> + sysconfig_refresh(priv);
> +}
> +
> +static int sysconfig_isc_finish(struct sysconfig_priv *priv)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv = priv->fpga_priv;
> + int ret, retries = SYSCONFIG_REFRESH_RETRIES;
> + struct gpio_desc *done_gpio = priv->done;
> + u32 status;
> +
> + if (done_gpio) {
> + ret = sysconfig_isc_disable(priv);
> + if (ret)
> + return ret;
> +
> + return sysconfig_poll_gpio(done_gpio, true);
> + }
> +
> + while (retries--) {
> + ret = sysconfig_poll_status(priv, &status);
> + if (ret)
> + break;
> +
> + if ((status & SYSCONFIG_STATUS_DONE) &&
> + !(status & SYSCONFIG_STATUS_BUSY) &&
> + !(status & SYSCONFIG_STATUS_ERR)) {
> + return sysconfig_isc_disable(priv);
> + }
> +
> + if (fpga_priv->internal_flash) {
> + ret = sysconfig_refresh(priv);
> + if (ret)
> + break;
> + }
> + }
> +
> + return -EFAULT;
> +}
> +
> +static enum fpga_mgr_states sysconfig_ops_state(struct fpga_manager *mgr)
> +{
> + struct sysconfig_priv *priv = mgr->priv;
> + struct gpio_desc *done = priv->done;
> + u32 status;
> + int ret;
> +
> + if (done && (gpiod_get_value(done) > 0))
> + return FPGA_MGR_STATE_OPERATING;
> +
> + ret = sysconfig_read_status(priv, &status);
> + if (!ret && (status & SYSCONFIG_STATUS_DONE))
> + return FPGA_MGR_STATE_OPERATING;
> +
> + return FPGA_MGR_STATE_UNKNOWN;
> +}
> +
> +static int sysconfig_ops_write_init(struct fpga_manager *mgr,
> + struct fpga_image_info *info,
> + const char *buf, size_t count)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv;
> + struct sysconfig_priv *priv;
> + struct device *dev;
> + int ret;
> +
> + dev = &mgr->dev;
> + priv = mgr->priv;
> + fpga_priv = priv->fpga_priv;
> +
> + if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
> + dev_err(dev, "Partial reconfiguration is not supported\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (!fpga_priv->internal_flash) {
> + /* Write directly to SRAM */
> + ret = sysconfig_refresh(priv);
> + 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;
> + }
> +
> + if (fpga_priv->burst_write) {
> + /* Prepare for bitstream burst write */
> + ret = sysconfig_burst_write_init(priv);
> + if (ret)
> + dev_err(dev,
> + "Failed to prepare for bitstream burst write\n");
> + }
> +
> + return ret;
> +}
> +
> +static int sysconfig_ops_write(struct fpga_manager *mgr, const char *buf,
> + size_t count)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv;
> + struct sysconfig_priv *priv;
> +
> + priv = mgr->priv;
> + fpga_priv = priv->fpga_priv;
> +
> + if (fpga_priv->burst_write)
> + return sysconfig_bitstream_burst_write(priv, buf, count);
> +
> + return sysconfig_bitstream_paged_write(priv, buf, count);
> +}
> +
> +static int sysconfig_ops_write_complete(struct fpga_manager *mgr,
> + struct fpga_image_info *info)
> +{
> + const struct sysconfig_fpga_priv *fpga_priv;
> + struct sysconfig_priv *priv;
> + struct device *dev;
> + int ret;
> +
> + dev = &mgr->dev;
> + priv = mgr->priv;
> + fpga_priv = priv->fpga_priv;
> +
> + if (fpga_priv->burst_write) {
> + ret = sysconfig_burst_write_complete(priv);
> + if (!ret)
> + ret = sysconfig_poll_busy(priv);
> +
> + if (ret) {
> + dev_err(dev,
> + "Error while waiting bitstream write to finish\n");
> + goto fail;
> + }
> + }
> +
> + if (fpga_priv->internal_flash) {
> + ret = sysconfig_isc_prog_done(priv);
> + if (!ret)
> + ret = sysconfig_refresh(priv);
> +
> + if (ret) {
> + dev_err(dev, "Failed to enable Self-Download Mode\n");
> + goto fail;
> + }
> + }
> +
> + ret = sysconfig_isc_finish(priv);
> +
> +fail:
> + if (ret)
> + sysconfig_cleanup(priv);
> +
> + return ret;
> +}
> +
> +static const struct fpga_manager_ops sysconfig_fpga_mgr_ops = {
> + .state = sysconfig_ops_state,
> + .write_init = sysconfig_ops_write_init,
> + .write = sysconfig_ops_write,
> + .write_complete = sysconfig_ops_write_complete,
> +};
> +
> +int sysconfig_probe(struct sysconfig_priv *priv)
> +{
> + struct gpio_desc *program, *init, *done;
> + struct device *dev = priv->dev;
> + struct fpga_manager *mgr;
> + int ret;
> +
> + if (!dev)
> + return -ENODEV;
> +
> + program = devm_gpiod_get_optional(dev, "program", GPIOD_OUT_LOW);
> + if (IS_ERR(program)) {
> + ret = PTR_ERR(program);
> + dev_err(dev, "Failed to get PROGRAM GPIO: %d\n", ret);
> + return ret;
> + }
> +
> + init = devm_gpiod_get_optional(dev, "init", GPIOD_IN);
> + if (IS_ERR(init)) {
> + ret = PTR_ERR(init);
> + dev_err(dev, "Failed to get INIT GPIO: %d\n", ret);
> + return ret;
> + }
> +
> + done = devm_gpiod_get_optional(dev, "done", GPIOD_IN);
> + if (IS_ERR(done)) {
> + ret = PTR_ERR(done);
> + dev_err(dev, "Failed to get DONE GPIO: %d\n", ret);
> + return ret;
> + }
> +
> + priv->program = program;
> + priv->init = init;
> + priv->done = done;
> +
> + mgr = devm_fpga_mgr_register(dev, "Lattice sysCONFIG FPGA Manager",
> + &sysconfig_fpga_mgr_ops, priv);
> +
> + return PTR_ERR_OR_ZERO(mgr);
> +}
> diff --git a/drivers/fpga/sysconfig.h b/drivers/fpga/sysconfig.h
> new file mode 100644
> index 000000000000..decb0958ee51
> --- /dev/null
> +++ b/drivers/fpga/sysconfig.h
> @@ -0,0 +1,62 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef __LATTICE_SYSCONFIG_H
> +#define __LATTICE_SYSCONFIG_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_ISC_ERASE_SRAM BIT(0)
> +#define SYSCONFIG_ISC_ERASE_FLASH BIT(2)
> +
> +#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_REFRESH_RETRIES 16
> +#define SYSCONFIG_POLL_RETRIES 1000000
> +#define SYSCONFIG_POLL_INTERVAL_US 30
> +
> +#define SYSCONFIG_PAGE_SIZE 16
> +
> +struct sysconfig_fpga_priv {
> + u8 isc_enable_operand;
> + bool burst_write;
> + bool internal_flash;
> +};
> +
> +extern const struct sysconfig_fpga_priv ecp5_data;
> +extern const struct sysconfig_fpga_priv machxo2_data;
> +
> +struct sysconfig_priv {
> + const struct sysconfig_fpga_priv *fpga_priv;
> + struct gpio_desc *program;
> + struct gpio_desc *init;
> + struct gpio_desc *done;
> + struct device *dev;
> + int (*command_write)(struct sysconfig_priv *priv,
> + const void *tx_buf, size_t tx_len);
> + int (*command_write_with_data)(struct sysconfig_priv *priv,
> + const void *cmd_buf, size_t cmd_len,
> + const void *data_buf, size_t data_len);
> + int (*command_write_then_read)(struct sysconfig_priv *priv,
> + const void *tx_buf, size_t tx_len,
> + void *rx_buf, size_t rx_len);
> + int (*bitstream_burst_write_init)(struct sysconfig_priv *priv);
> + int (*bitstream_burst_write)(struct sysconfig_priv *priv,
> + const char *tx_buf, size_t tx_len);
> + int (*bitstream_burst_write_complete)(struct sysconfig_priv *priv);
> +};
> +
> +int sysconfig_probe(struct sysconfig_priv *priv);
> +
> +#endif /* __LATTICE_SYSCONFIG_H */
> --
> 2.37.3
>
>
