2  * Xilinx Spartan6 Slave Serial SPI Driver
12  * Manage Xilinx FPGA firmware that is loaded over SPI using
13  * the slave serial configuration interface.
18 #include <linux/fpga/fpga-mgr.h>
23 #include <linux/spi/spi.h>
27 	struct spi_device *spi;  member
34 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_state()
36 	if (!gpiod_get_value(conf->done))  in xilinx_spi_state()
46 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write_init()
50 	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {  in xilinx_spi_write_init()
51 		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");  in xilinx_spi_write_init()
52 		return -EINVAL;  in xilinx_spi_write_init()
55 	gpiod_set_value(conf->prog_b, 1);  in xilinx_spi_write_init()
59 	gpiod_set_value(conf->prog_b, 0);  in xilinx_spi_write_init()
61 	if (gpiod_get_value(conf->done)) {  in xilinx_spi_write_init()
62 		dev_err(&mgr->dev, "Unexpected DONE pin state...\n");  in xilinx_spi_write_init()
63 		return -EIO;  in xilinx_spi_write_init()
74 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write()
82 		remaining = fw_data_end - fw_data;  in xilinx_spi_write()
85 		ret = spi_write(conf->spi, fw_data, stride);  in xilinx_spi_write()
87 			dev_err(&mgr->dev, "SPI error in firmware write: %d\n",  in xilinx_spi_write()
99 	struct spi_device *spi = conf->spi;  in xilinx_spi_apply_cclk_cycles()  local
103 	ret = spi_write(conf->spi, din_data, sizeof(din_data));  in xilinx_spi_apply_cclk_cycles()
105 		dev_err(&spi->dev, "applying CCLK cycles failed: %d\n", ret);  in xilinx_spi_apply_cclk_cycles()
113 	struct xilinx_spi_conf *conf = mgr->priv;  in xilinx_spi_write_complete()
117 	if (gpiod_get_value(conf->done))  in xilinx_spi_write_complete()
120 	timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us);  in xilinx_spi_write_complete()
128 		if (gpiod_get_value(conf->done))  in xilinx_spi_write_complete()
132 	dev_err(&mgr->dev, "Timeout after config data transfer.\n");  in xilinx_spi_write_complete()
133 	return -ETIMEDOUT;  in xilinx_spi_write_complete()
143 static int xilinx_spi_probe(struct spi_device *spi)  in xilinx_spi_probe()  argument
149 	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);  in xilinx_spi_probe()
151 		return -ENOMEM;  in xilinx_spi_probe()
153 	conf->spi = spi;  in xilinx_spi_probe()
156 	conf->prog_b = devm_gpiod_get(&spi->dev, "prog_b", GPIOD_OUT_LOW);  in xilinx_spi_probe()
157 	if (IS_ERR(conf->prog_b)) {  in xilinx_spi_probe()
158 		dev_err(&spi->dev, "Failed to get PROGRAM_B gpio: %ld\n",  in xilinx_spi_probe()
159 			PTR_ERR(conf->prog_b));  in xilinx_spi_probe()
160 		return PTR_ERR(conf->prog_b);  in xilinx_spi_probe()
163 	conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN);  in xilinx_spi_probe()
164 	if (IS_ERR(conf->done)) {  in xilinx_spi_probe()
165 		dev_err(&spi->dev, "Failed to get DONE gpio: %ld\n",  in xilinx_spi_probe()
166 			PTR_ERR(conf->done));  in xilinx_spi_probe()
167 		return PTR_ERR(conf->done);  in xilinx_spi_probe()
170 	mgr = fpga_mgr_create(&spi->dev, "Xilinx Slave Serial FPGA Manager",  in xilinx_spi_probe()
173 		return -ENOMEM;  in xilinx_spi_probe()
175 	spi_set_drvdata(spi, mgr);  in xilinx_spi_probe()
184 static int xilinx_spi_remove(struct spi_device *spi)  in xilinx_spi_remove()  argument
186 	struct fpga_manager *mgr = spi_get_drvdata(spi);  in xilinx_spi_remove()
194 	{ .compatible = "xlnx,fpga-slave-serial", },
201 		.name = "xlnx-slave-spi",
212 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");