1 // SPDX-License-Identifier: GPL-2.0-only
3  * Xilinx Spartan6 and 7 Series Slave Serial SPI Driver
9  * Manage Xilinx FPGA firmware that is loaded over SPI using
10  * the slave serial configuration interface.
15 #include <linux/fpga/fpga-mgr.h>
20 #include <linux/spi/spi.h>
24 	struct spi_device *spi;  member
32 	struct xilinx_spi_conf *conf = mgr->priv;  in get_done_gpio()
35 	ret = gpiod_get_value(conf->done);  in get_done_gpio()
38 		dev_err(&mgr->dev, "Error reading DONE (%d)\n", ret);  in get_done_gpio()
52  * wait_for_init_b - wait for the INIT_B pin to have a given state, or wait
59  * Returns 0 when the INIT_B GPIO reached the given state or -ETIMEDOUT if
66 	struct xilinx_spi_conf *conf = mgr->priv;  in wait_for_init_b()
69 	if (conf->init_b) {  in wait_for_init_b()
71 			int ret = gpiod_get_value(conf->init_b);  in wait_for_init_b()
77 				dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret);  in wait_for_init_b()
84 		dev_err(&mgr->dev, "Timeout waiting for INIT_B to %s\n",  in wait_for_init_b()
86 		return -ETIMEDOUT;  in wait_for_init_b()
98 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write_init()
101 	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {  in xilinx_spi_write_init()
102 		dev_err(&mgr->dev, "Partial reconfiguration not supported\n");  in xilinx_spi_write_init()
103 		return -EINVAL;  in xilinx_spi_write_init()
106 	gpiod_set_value(conf->prog_b, 1);  in xilinx_spi_write_init()
110 		gpiod_set_value(conf->prog_b, 0);  in xilinx_spi_write_init()
114 	gpiod_set_value(conf->prog_b, 0);  in xilinx_spi_write_init()
121 		dev_err(&mgr->dev, "Unexpected DONE pin state...\n");  in xilinx_spi_write_init()
122 		return -EIO;  in xilinx_spi_write_init()
133 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write()
141 		remaining = fw_data_end - fw_data;  in xilinx_spi_write()
144 		ret = spi_write(conf->spi, fw_data, stride);  in xilinx_spi_write()
146 			dev_err(&mgr->dev, "SPI error in firmware write: %d\n",  in xilinx_spi_write()
158 	struct spi_device *spi = conf->spi;  in xilinx_spi_apply_cclk_cycles()  local
162 	ret = spi_write(conf->spi, din_data, sizeof(din_data));  in xilinx_spi_apply_cclk_cycles()
164 		dev_err(&spi->dev, "applying CCLK cycles failed: %d\n", ret);  in xilinx_spi_apply_cclk_cycles()
172 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write_complete()
173 	unsigned long timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us);  in xilinx_spi_write_complete()
198 	if (conf->init_b) {  in xilinx_spi_write_complete()
199 		ret = gpiod_get_value(conf->init_b);  in xilinx_spi_write_complete()
202 			dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret);  in xilinx_spi_write_complete()
206 		dev_err(&mgr->dev,  in xilinx_spi_write_complete()
210 		dev_err(&mgr->dev, "Timeout after config data transfer\n");  in xilinx_spi_write_complete()
213 	return -ETIMEDOUT;  in xilinx_spi_write_complete()
223 static int xilinx_spi_probe(struct spi_device *spi)  in xilinx_spi_probe()  argument
228 	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);  in xilinx_spi_probe()
230 		return -ENOMEM;  in xilinx_spi_probe()
232 	conf->spi = spi;  in xilinx_spi_probe()
235 	conf->prog_b = devm_gpiod_get(&spi->dev, "prog_b", GPIOD_OUT_LOW);  in xilinx_spi_probe()
236 	if (IS_ERR(conf->prog_b)) {  in xilinx_spi_probe()
237 		dev_err(&spi->dev, "Failed to get PROGRAM_B gpio: %ld\n",  in xilinx_spi_probe()
238 			PTR_ERR(conf->prog_b));  in xilinx_spi_probe()
239 		return PTR_ERR(conf->prog_b);  in xilinx_spi_probe()
242 	conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN);  in xilinx_spi_probe()
243 	if (IS_ERR(conf->init_b)) {  in xilinx_spi_probe()
244 		dev_err(&spi->dev, "Failed to get INIT_B gpio: %ld\n",  in xilinx_spi_probe()
245 			PTR_ERR(conf->init_b));  in xilinx_spi_probe()
246 		return PTR_ERR(conf->init_b);  in xilinx_spi_probe()
249 	conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN);  in xilinx_spi_probe()
250 	if (IS_ERR(conf->done)) {  in xilinx_spi_probe()
251 		dev_err(&spi->dev, "Failed to get DONE gpio: %ld\n",  in xilinx_spi_probe()
252 			PTR_ERR(conf->done));  in xilinx_spi_probe()
253 		return PTR_ERR(conf->done);  in xilinx_spi_probe()
256 	mgr = devm_fpga_mgr_create(&spi->dev,  in xilinx_spi_probe()
257 				   "Xilinx Slave Serial FPGA Manager",  in xilinx_spi_probe()
260 		return -ENOMEM;  in xilinx_spi_probe()
262 	spi_set_drvdata(spi, mgr);  in xilinx_spi_probe()
267 static int xilinx_spi_remove(struct spi_device *spi)  in xilinx_spi_remove()  argument
269 	struct fpga_manager *mgr = spi_get_drvdata(spi);  in xilinx_spi_remove()
277 	{ .compatible = "xlnx,fpga-slave-serial", },
284 		.name = "xlnx-slave-spi",
295 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");