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
10  * serial configuration method.
18 #include <linux/fpga/fpga-mgr.h>
75 	{ .compatible = "altr,fpga-passive-serial", .data = &c5_data },
76 	{ .compatible = "altr,fpga-arria10-passive-serial", .data = &a10_data },
83 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_state()
85 	if (gpiod_get_value_cansleep(conf->status))  in altera_ps_state()
103 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write_init()
107 	conf->info_flags = info->flags;  in altera_ps_write_init()
109 	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {  in altera_ps_write_init()
110 		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");  in altera_ps_write_init()
111 		return -EINVAL;  in altera_ps_write_init()
114 	gpiod_set_value_cansleep(conf->config, 1);  in altera_ps_write_init()
117 	altera_ps_delay(conf->data->t_cfg_us);  in altera_ps_write_init()
119 	if (!gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_init()
120 		dev_err(&mgr->dev, "Status pin failed to show a reset\n");  in altera_ps_write_init()
121 		return -EIO;  in altera_ps_write_init()
124 	gpiod_set_value_cansleep(conf->config, 0);  in altera_ps_write_init()
126 	min = conf->data->status_wait_min_us;  in altera_ps_write_init()
127 	max = conf->data->status_wait_max_us;  in altera_ps_write_init()
135 		if (!gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_init()
137 			altera_ps_delay(conf->data->t_st2ck_us);  in altera_ps_write_init()
142 	dev_err(&mgr->dev, "Status pin not ready.\n");  in altera_ps_write_init()
143 	return -EIO;  in altera_ps_write_init()
150 	const u32 *fw_end = (u32 *)(buf + len - extra_bytes);  in rev_buf()
163 			extra_bytes--;  in rev_buf()
171 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write()
177 		size_t stride = min_t(size_t, fw_data_end - fw_data, SZ_4K);  in altera_ps_write()
179 		if (!(conf->info_flags & FPGA_MGR_BITSTREAM_LSB_FIRST))  in altera_ps_write()
182 		ret = spi_write(conf->spi, fw_data, stride);  in altera_ps_write()
184 			dev_err(&mgr->dev, "spi error in firmware write: %d\n",  in altera_ps_write()
197 	struct altera_ps_conf *conf = mgr->priv;  in altera_ps_write_complete()
201 	if (gpiod_get_value_cansleep(conf->status)) {  in altera_ps_write_complete()
202 		dev_err(&mgr->dev, "Error during configuration.\n");  in altera_ps_write_complete()
203 		return -EIO;  in altera_ps_write_complete()
206 	if (conf->confd) {  in altera_ps_write_complete()
207 		if (!gpiod_get_raw_value_cansleep(conf->confd)) {  in altera_ps_write_complete()
208 			dev_err(&mgr->dev, "CONF_DONE is inactive!\n");  in altera_ps_write_complete()
209 			return -EIO;  in altera_ps_write_complete()
217 	ret = spi_write(conf->spi, dummy, 1);  in altera_ps_write_complete()
219 		dev_err(&mgr->dev, "spi error during end sequence: %d\n", ret);  in altera_ps_write_complete()
238 	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);  in altera_ps_probe()
240 		return -ENOMEM;  in altera_ps_probe()
242 	conf->data = spi_get_device_match_data(spi);  in altera_ps_probe()
243 	conf->spi = spi;  in altera_ps_probe()
244 	conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);  in altera_ps_probe()
245 	if (IS_ERR(conf->config)) {  in altera_ps_probe()
246 		dev_err(&spi->dev, "Failed to get config gpio: %ld\n",  in altera_ps_probe()
247 			PTR_ERR(conf->config));  in altera_ps_probe()
248 		return PTR_ERR(conf->config);  in altera_ps_probe()
251 	conf->status = devm_gpiod_get(&spi->dev, "nstat", GPIOD_IN);  in altera_ps_probe()
252 	if (IS_ERR(conf->status)) {  in altera_ps_probe()
253 		dev_err(&spi->dev, "Failed to get status gpio: %ld\n",  in altera_ps_probe()
254 			PTR_ERR(conf->status));  in altera_ps_probe()
255 		return PTR_ERR(conf->status);  in altera_ps_probe()
258 	conf->confd = devm_gpiod_get_optional(&spi->dev, "confd", GPIOD_IN);  in altera_ps_probe()
259 	if (IS_ERR(conf->confd)) {  in altera_ps_probe()
260 		dev_err(&spi->dev, "Failed to get confd gpio: %ld\n",  in altera_ps_probe()
261 			PTR_ERR(conf->confd));  in altera_ps_probe()
262 		return PTR_ERR(conf->confd);  in altera_ps_probe()
263 	} else if (!conf->confd) {  in altera_ps_probe()
264 		dev_warn(&spi->dev, "Not using confd gpio");  in altera_ps_probe()
268 	snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s %s",  in altera_ps_probe()
269 		 dev_driver_string(&spi->dev), dev_name(&spi->dev));  in altera_ps_probe()
271 	mgr = devm_fpga_mgr_register(&spi->dev, conf->mgr_name,  in altera_ps_probe()
277 	{ "cyclone-ps-spi", (uintptr_t)&c5_data },
278 	{ "fpga-passive-serial", (uintptr_t)&c5_data },
279 	{ "fpga-arria10-passive-serial", (uintptr_t)&a10_data },
286 		.name = "altera-ps-spi",
297 MODULE_DESCRIPTION("Module to load Altera FPGA firmware over SPI");