1 // SPDX-License-Identifier: GPL-2.0
3  * Lattice MachXO2 Slave SPI Driver
5  * Manage Lattice FPGA firmware that is loaded over SPI using
6  * the slave serial configuration interface.
12 #include <linux/fpga/fpga-mgr.h>
16 #include <linux/spi/spi.h>
18 /* MachXO2 Programming Guide - sysCONFIG Programming Commands */
29  * Max CCLK in Slave SPI mode according to 'MachXO2 Family Data
30  * Sheet' sysCONFIG Port Timing Specifications (3-36)
66 static int get_status(struct spi_device *spi, unsigned long *status)  in get_status()  argument
82 	ret = spi_sync(spi, &msg);  in get_status()
112 	pr_debug("machxo2 status: 0x%08lX - done=%d, cfgena=%d, busy=%d, fail=%d, devver=%d, err=%s\n",  in dump_status_reg()
119 static int wait_until_not_busy(struct spi_device *spi)  in wait_until_not_busy()  argument
125 		ret = get_status(spi, &status);  in wait_until_not_busy()
129 			return -EBUSY;  in wait_until_not_busy()
137 	struct spi_device *spi = mgr->priv;  in machxo2_cleanup()  local
149 	ret = spi_sync(spi, &msg);  in machxo2_cleanup()
153 	ret = wait_until_not_busy(spi);  in machxo2_cleanup()
163 	ret = spi_sync(spi, &msg);  in machxo2_cleanup()
169 	dev_err(&mgr->dev, "Cleanup failed\n");  in machxo2_cleanup()
176 	struct spi_device *spi = mgr->priv;  in machxo2_spi_state()  local
179 	get_status(spi, &status);  in machxo2_spi_state()
191 	struct spi_device *spi = mgr->priv;  in machxo2_write_init()  local
200 	if ((info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {  in machxo2_write_init()
201 		dev_err(&mgr->dev,  in machxo2_write_init()
203 		return -ENOTSUPP;  in machxo2_write_init()
206 	get_status(spi, &status);  in machxo2_write_init()
219 	ret = spi_sync(spi, &msg);  in machxo2_write_init()
223 	ret = wait_until_not_busy(spi);  in machxo2_write_init()
227 	get_status(spi, &status);  in machxo2_write_init()
229 		ret = -EINVAL;  in machxo2_write_init()
238 	ret = spi_sync(spi, &msg);  in machxo2_write_init()
242 	get_status(spi, &status);  in machxo2_write_init()
247 	dev_err(&mgr->dev, "Error during FPGA init.\n");  in machxo2_write_init()
255 	struct spi_device *spi = mgr->priv;  in machxo2_write()  local
264 		dev_err(&mgr->dev, "Malformed payload.\n");  in machxo2_write()
265 		return -EINVAL;  in machxo2_write()
267 	get_status(spi, &status);  in machxo2_write()
279 		ret = spi_sync(spi, &msg);  in machxo2_write()
281 			dev_err(&mgr->dev, "Error loading the bitstream.\n");  in machxo2_write()
285 	get_status(spi, &status);  in machxo2_write()
294 	struct spi_device *spi = mgr->priv;  in machxo2_write_complete()  local
307 	ret = spi_sync(spi, &msg);  in machxo2_write_complete()
310 	ret = wait_until_not_busy(spi);  in machxo2_write_complete()
314 	get_status(spi, &status);  in machxo2_write_complete()
318 		ret = -EINVAL;  in machxo2_write_complete()
329 		ret = spi_sync(spi, &msg);  in machxo2_write_complete()
334 		get_status(spi, &status);  in machxo2_write_complete()
341 			ret = -EINVAL;  in machxo2_write_complete()
346 	get_status(spi, &status);  in machxo2_write_complete()
351 	dev_err(&mgr->dev, "Refresh failed.\n");  in machxo2_write_complete()
363 static int machxo2_spi_probe(struct spi_device *spi)  in machxo2_spi_probe()  argument
365 	struct device *dev = &spi->dev;  in machxo2_spi_probe()
368 	if (spi->max_speed_hz > MACHXO2_MAX_SPEED) {  in machxo2_spi_probe()
370 		return -EINVAL;  in machxo2_spi_probe()
373 	mgr = devm_fpga_mgr_register(dev, "Lattice MachXO2 SPI FPGA Manager",  in machxo2_spi_probe()
374 				     &machxo2_ops, spi);  in machxo2_spi_probe()
380 	{ .compatible = "lattice,machxo2-slave-spi", },
387 	{ "machxo2-slave-spi", 0 },
390 MODULE_DEVICE_TABLE(spi, lattice_ids);
394 		.name = "machxo2-slave-spi",
404 MODULE_DESCRIPTION("Load Lattice FPGA firmware over SPI");