On 2022-08-15 at 16:21:56 +0300, Ivan Bornyakov wrote: > Add support to the FPGA manager for programming Lattice ECP5 FPGA over > slave SPI interface with .bit formatted uncompressed bitstream image. Not sure if something is missed. https://lore.kernel.org/all/20220729145757.GA2601292@yilunxu-OptiPlex-7050/ I was considering if a generic driver for lattice slave SPI sysCONFIG interface could be introduced. From machxo2 & ecp5 Programming Usage Guide, or others in this series, they basically use the same reconfigure interface & protocol. Thanks, Yilun > > Signed-off-by: Ivan Bornyakov <i.bornyakov@xxxxxxxxxxx> > --- > drivers/fpga/Kconfig | 7 + > drivers/fpga/Makefile | 1 + > drivers/fpga/ecp5-spi.c | 311 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 319 insertions(+) > create mode 100644 drivers/fpga/ecp5-spi.c > > diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig > index 6c416955da53..920277a08ed9 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_ECP5_SPI > + tristate "Lattice ECP5 SPI FPGA manager" > + depends on SPI > + help > + FPGA manager driver support for Lattice ECP5 programming over slave > + SPI interface with .bit formatted uncompressed bitstream image. > + > endif # FPGA > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile > index 42ae8b58abce..17c7a3c4b385 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-$(CONFIG_FPGA_MGR_ECP5_SPI) += ecp5-spi.o > obj-$(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/ecp5-spi.c b/drivers/fpga/ecp5-spi.c > new file mode 100644 > index 000000000000..aa0dd10823a3 > --- /dev/null > +++ b/drivers/fpga/ecp5-spi.c > @@ -0,0 +1,311 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Lattice ECP5 FPGA programming over slave SPI interface. > + */ > + > +#include <linux/delay.h> > +#include <linux/fpga/fpga-mgr.h> > +#include <linux/spi/spi.h> > + > +#define ECP5_SPI_MAX_SPEED_HZ 60000000 > + > +#define ECP5_SPI_ISC_ENABLE {0xC6, 0x00, 0x00, 0x00} > +#define ECP5_SPI_ISC_DISABLE {0x26, 0x00, 0x00, 0x00} > +#define ECP5_SPI_ISC_ERASE {0x0E, 0x01, 0x00, 0x00} > +#define ECP5_SPI_LSC_INIT_ADDR {0x46, 0x00, 0x00, 0x00} > +#define ECP5_SPI_LSC_BITSTREAM_BURST {0x7a, 0x00, 0x00, 0x00} > +#define ECP5_SPI_LSC_CHECK_BUSY {0xF0, 0x00, 0x00, 0x00} > + > +#define ECP5_POLL_RETRIES 100000 > + > +struct ecp5_priv { > + struct gpio_desc *program; > + struct gpio_desc *init; > + struct gpio_desc *done; > + struct spi_device *spi; > +}; > + > +static enum fpga_mgr_states ecp5_ops_state(struct fpga_manager *mgr) > +{ > + struct ecp5_priv *priv = mgr->priv; > + > + return gpiod_get_value(priv->done) ? FPGA_MGR_STATE_OPERATING : > + FPGA_MGR_STATE_UNKNOWN; > +} > + > +static int ecp5_poll_busy(struct spi_device *spi) > +{ > + const u8 lsc_check_busy[] = ECP5_SPI_LSC_CHECK_BUSY; > + int ret, retries = ECP5_POLL_RETRIES; > + struct spi_transfer xfers[2] = { 0 }; > + struct spi_message msg; > + u8 busy; > + > + xfers[0].tx_buf = lsc_check_busy; > + xfers[0].len = sizeof(lsc_check_busy); > + xfers[1].rx_buf = &busy; > + xfers[1].len = sizeof(busy); > + > + while (retries--) { > + spi_message_init_with_transfers(&msg, xfers, ARRAY_SIZE(xfers)); > + ret = spi_sync_locked(spi, &msg); > + if (ret) > + return ret; > + > + if (!busy) > + return 0; > + > + usleep_range(50, 100); > + } > + > + return -EBUSY; > +} > + > +static int ecp5_poll_gpio(struct gpio_desc *gpio, bool is_active) > +{ > + int value, retries = ECP5_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 -EFAULT; > +} > + > +static int ecp5_ops_write_init(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + const char *buf, size_t count) > +{ > + const u8 lsc_bitstream_burst[] = ECP5_SPI_LSC_BITSTREAM_BURST; > + const u8 lsc_init_addr[] = ECP5_SPI_LSC_INIT_ADDR; > + const u8 isc_enable[] = ECP5_SPI_ISC_ENABLE; > + const u8 isc_erase[] = ECP5_SPI_ISC_ERASE; > + struct ecp5_priv *priv = mgr->priv; > + struct spi_device *spi = priv->spi; > + struct device *dev = &mgr->dev; > + struct spi_transfer isc_xfers[] = { > + { > + .tx_buf = isc_enable, > + .len = sizeof(isc_enable), > + .cs_change = 1, > + }, { > + .tx_buf = isc_erase, > + .len = sizeof(isc_erase), > + }, > + }; > + struct spi_transfer lsc_xfers[] = { > + { > + .tx_buf = lsc_init_addr, > + .len = sizeof(lsc_init_addr), > + .cs_change = 1, > + }, { > + .tx_buf = lsc_bitstream_burst, > + .len = sizeof(lsc_bitstream_burst), > + .cs_change = 1, > + }, > + }; > + struct spi_message msg; > + int ret; > + > + if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) { > + dev_err(dev, "Partial reconfiguration is not supported\n"); > + return -EOPNOTSUPP; > + } > + > + /* Enter init mode */ > + gpiod_set_value(priv->program, 1); > + > + ret = ecp5_poll_gpio(priv->init, true); > + if (!ret) > + ret = ecp5_poll_gpio(priv->done, false); > + > + if (ret) { > + dev_err(dev, "Failed to go to initialization mode\n"); > + return ret; > + } > + > + /* Enter program mode */ > + gpiod_set_value(priv->program, 0); > + > + ret = ecp5_poll_gpio(priv->init, false); > + if (ret) { > + dev_err(dev, "Failed to go to program mode\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); > + > + /* Enter ISC mode */ > + spi_message_init_with_transfers(&msg, isc_xfers, ARRAY_SIZE(isc_xfers)); > + ret = spi_sync_locked(spi, &msg); > + if (!ret) > + ret = ecp5_poll_busy(spi); > + > + if (ret) { > + dev_err(dev, "Failed to go to ISC mode\n"); > + goto out; > + } > + > + /* Prepare for bitstream burst write */ > + spi_message_init_with_transfers(&msg, lsc_xfers, ARRAY_SIZE(lsc_xfers)); > + ret = spi_sync_locked(spi, &msg); > + if (ret) > + dev_err(dev, "Failed to prepare for bitstream burst write\n"); > + > +out: > + if (ret) > + spi_bus_unlock(spi->controller); > + > + return ret; > +} > + > +static int ecp5_ops_write(struct fpga_manager *mgr, const char *buf, size_t count) > +{ > + struct ecp5_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) > +{ > + const u8 isc_disable[] = ECP5_SPI_ISC_DISABLE; > + struct ecp5_priv *priv = mgr->priv; > + struct spi_device *spi = priv->spi; > + struct spi_transfer xfer = { 0 }; > + struct device *dev = &mgr->dev; > + struct spi_message msg; > + int ret; > + > + /* Toggle CS and wait for bitstream write to finish */ > + spi_message_init_with_transfers(&msg, &xfer, 1); > + ret = spi_sync_locked(spi, &msg); > + if (!ret) > + ret = ecp5_poll_busy(spi); > + > + if (ret) { > + dev_err(dev, "Error while waiting bitstream write to finish\n"); > + goto out; > + } > + > + /* Exit ISC mode */ > + xfer.tx_buf = isc_disable; > + xfer.len = sizeof(isc_disable); > + spi_message_init_with_transfers(&msg, &xfer, 1); > + ret = spi_sync_locked(spi, &msg); > + if (!ret) > + ret = ecp5_poll_gpio(priv->done, true); > + > + if (ret) > + dev_err(dev, "Failed to finish ISC\n"); > + > +out: > + spi_bus_unlock(spi->controller); > + > + 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 spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + struct fpga_manager *mgr; > + struct ecp5_priv *priv; > + 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 = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->spi = spi; > + > + 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 const struct spi_device_id ecp5_spi_ids[] = { > + { .name = "ecp5-fpga-mgr" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(spi, ecp5_spi_ids); > + > +#if IS_ENABLED(CONFIG_OF) > +static const struct of_device_id ecp5_of_ids[] = { > + { .compatible = "lattice,ecp5-fpga-mgr" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, ecp5_of_ids); > +#endif /* IS_ENABLED(CONFIG_OF) */ > + > +static struct spi_driver ecp5_driver = { > + .probe = ecp5_probe, > + .id_table = ecp5_spi_ids, > + .driver = { > + .name = "lattice_ecp5_spi_fpga_mgr", > + .of_match_table = of_match_ptr(ecp5_of_ids), > + }, > +}; > + > +module_spi_driver(ecp5_driver); > + > +MODULE_DESCRIPTION("Lattice ECP5 SPI FPGA Manager"); > +MODULE_LICENSE("GPL"); > -- > 2.37.1 > >
