1 // SPDX-License-Identifier: GPL-2.0-only
9  * Manage Xilinx FPGA firmware that is loaded over SPI using
15 #include <linux/fpga/fpga-mgr.h>
30 static int get_done_gpio(struct fpga_manager *mgr)  in get_done_gpio()  argument
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()
43 static enum fpga_mgr_states xilinx_spi_state(struct fpga_manager *mgr)  in xilinx_spi_state()  argument
45 	if (!get_done_gpio(mgr))  in xilinx_spi_state()
52  * wait_for_init_b - wait for the INIT_B pin to have a given state, or wait
55  * @mgr:        The FPGA manager object
59  * Returns 0 when the INIT_B GPIO reached the given state or -ETIMEDOUT if
63 static int wait_for_init_b(struct fpga_manager *mgr, int value,  in wait_for_init_b()  argument
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()
94 static int xilinx_spi_write_init(struct fpga_manager *mgr,  in xilinx_spi_write_init()  argument
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()
108 	err = wait_for_init_b(mgr, 1, 1); /* min is 500 ns */  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()
116 	err = wait_for_init_b(mgr, 0, 0);  in xilinx_spi_write_init()
120 	if (get_done_gpio(mgr)) {  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()
130 static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf,  in xilinx_spi_write()  argument
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()
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()
169 static int xilinx_spi_write_complete(struct fpga_manager *mgr,  in xilinx_spi_write_complete()  argument
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()
186 		done = get_done_gpio(mgr);  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()
226 	struct fpga_manager *mgr;  in xilinx_spi_probe()  local
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 		return dev_err_probe(&spi->dev, PTR_ERR(conf->prog_b),  in xilinx_spi_probe()
240 	conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN);  in xilinx_spi_probe()
241 	if (IS_ERR(conf->init_b))  in xilinx_spi_probe()
242 		return dev_err_probe(&spi->dev, PTR_ERR(conf->init_b),  in xilinx_spi_probe()
245 	conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN);  in xilinx_spi_probe()
246 	if (IS_ERR(conf->done))  in xilinx_spi_probe()
247 		return dev_err_probe(&spi->dev, PTR_ERR(conf->done),  in xilinx_spi_probe()
250 	mgr = devm_fpga_mgr_register(&spi->dev,  in xilinx_spi_probe()
251 				     "Xilinx Slave Serial FPGA Manager",  in xilinx_spi_probe()
253 	return PTR_ERR_OR_ZERO(mgr);  in xilinx_spi_probe()
258 	{ .compatible = "xlnx,fpga-slave-serial", },
266 		.name = "xlnx-slave-spi",
276 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");