1 // SPDX-License-Identifier: GPL-2.0-only
3  * Altera Passive Serial SPI Driver
9  * Manage Altera FPGA firmware that is loaded over SPI using the passive
18 #include <linux/fpga/fpga-mgr.h>
23 #include <linux/spi/spi.h>
43 	struct spi_device *spi;  member
82 	{ .compatible = "altr,fpga-passive-serial", .data = &c5_data },
83 	{ .compatible = "altr,fpga-arria10-passive-serial", .data = &a10_data },
90 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_state()
92 	if (gpiod_get_value_cansleep(conf->status))  in altera_ps_state()
110 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write_init()
114 	conf->info_flags = info->flags;  in altera_ps_write_init()
116 	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {  in altera_ps_write_init()
117 		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");  in altera_ps_write_init()
118 		return -EINVAL;  in altera_ps_write_init()
121 	gpiod_set_value_cansleep(conf->config, 1);  in altera_ps_write_init()
124 	altera_ps_delay(conf->data->t_cfg_us);  in altera_ps_write_init()
126 	if (!gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_init()
127 		dev_err(&mgr->dev, "Status pin failed to show a reset\n");  in altera_ps_write_init()
128 		return -EIO;  in altera_ps_write_init()
131 	gpiod_set_value_cansleep(conf->config, 0);  in altera_ps_write_init()
133 	min = conf->data->status_wait_min_us;  in altera_ps_write_init()
134 	max = conf->data->status_wait_max_us;  in altera_ps_write_init()
142 		if (!gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_init()
144 			altera_ps_delay(conf->data->t_st2ck_us);  in altera_ps_write_init()
149 	dev_err(&mgr->dev, "Status pin not ready.\n");  in altera_ps_write_init()
150 	return -EIO;  in altera_ps_write_init()
157 	const u32 *fw_end = (u32 *)(buf + len - extra_bytes);  in rev_buf()
159 	/* set buffer to lsb first */  in rev_buf()
170 			extra_bytes--;  in rev_buf()
178 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write()
184 		size_t stride = min_t(size_t, fw_data_end - fw_data, SZ_4K);  in altera_ps_write()
186 		if (!(conf->info_flags & FPGA_MGR_BITSTREAM_LSB_FIRST))  in altera_ps_write()
189 		ret = spi_write(conf->spi, fw_data, stride);  in altera_ps_write()
191 			dev_err(&mgr->dev, "spi error in firmware write: %d\n",  in altera_ps_write()
204 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write_complete()
208 	if (gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_complete()
209 		dev_err(&mgr->dev, "Error during configuration.\n");  in altera_ps_write_complete()
210 		return -EIO;  in altera_ps_write_complete()
213 	if (conf->confd) {  in altera_ps_write_complete()
214 		if (!gpiod_get_raw_value_cansleep(conf->confd)) {  in altera_ps_write_complete()
215 			dev_err(&mgr->dev, "CONF_DONE is inactive!\n");  in altera_ps_write_complete()
216 			return -EIO;  in altera_ps_write_complete()
224 	ret = spi_write(conf->spi, dummy, 1);  in altera_ps_write_complete()
226 		dev_err(&mgr->dev, "spi error during end sequence: %d\n", ret);  in altera_ps_write_complete()
242 	kernel_ulong_t devtype = id->driver_data;  in id_to_data()
250 	if (!data || data->devtype != devtype)  in id_to_data()
256 static int altera_ps_probe(struct spi_device *spi)  in altera_ps_probe()  argument
262 	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);  in altera_ps_probe()
264 		return -ENOMEM;  in altera_ps_probe()
266 	if (spi->dev.of_node) {  in altera_ps_probe()
267 		of_id = of_match_device(of_ef_match, &spi->dev);  in altera_ps_probe()
269 			return -ENODEV;  in altera_ps_probe()
270 		conf->data = of_id->data;  in altera_ps_probe()
272 		conf->data = id_to_data(spi_get_device_id(spi));  in altera_ps_probe()
273 		if (!conf->data)  in altera_ps_probe()
274 			return -ENODEV;  in altera_ps_probe()
277 	conf->spi = spi;  in altera_ps_probe()
278 	conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);  in altera_ps_probe()
279 	if (IS_ERR(conf->config)) {  in altera_ps_probe()
280 		dev_err(&spi->dev, "Failed to get config gpio: %ld\n",  in altera_ps_probe()
281 			PTR_ERR(conf->config));  in altera_ps_probe()
282 		return PTR_ERR(conf->config);  in altera_ps_probe()
285 	conf->status = devm_gpiod_get(&spi->dev, "nstat", GPIOD_IN);  in altera_ps_probe()
286 	if (IS_ERR(conf->status)) {  in altera_ps_probe()
287 		dev_err(&spi->dev, "Failed to get status gpio: %ld\n",  in altera_ps_probe()
288 			PTR_ERR(conf->status));  in altera_ps_probe()
289 		return PTR_ERR(conf->status);  in altera_ps_probe()
292 	conf->confd = devm_gpiod_get_optional(&spi->dev, "confd", GPIOD_IN);  in altera_ps_probe()
293 	if (IS_ERR(conf->confd)) {  in altera_ps_probe()
294 		dev_err(&spi->dev, "Failed to get confd gpio: %ld\n",  in altera_ps_probe()
295 			PTR_ERR(conf->confd));  in altera_ps_probe()
296 		return PTR_ERR(conf->confd);  in altera_ps_probe()
297 	} else if (!conf->confd) {  in altera_ps_probe()
298 		dev_warn(&spi->dev, "Not using confd gpio");  in altera_ps_probe()
302 	snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s %s",  in altera_ps_probe()
303 		 dev_driver_string(&spi->dev), dev_name(&spi->dev));  in altera_ps_probe()
305 	mgr = devm_fpga_mgr_register(&spi->dev, conf->mgr_name,  in altera_ps_probe()
311 	{ "cyclone-ps-spi", CYCLONE5 },
312 	{ "fpga-passive-serial", CYCLONE5 },
313 	{ "fpga-arria10-passive-serial", ARRIA10 },
316 MODULE_DEVICE_TABLE(spi, altera_ps_spi_ids);
320 		.name = "altera-ps-spi",
332 MODULE_DESCRIPTION("Module to load Altera FPGA firmware over SPI");