1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/spi/spi.h>
16 #define FIRMWARE_NAME	"lattice-ecp3.bit"
36  * (LatticeECP3 Slave SPI Port User's Guide)
57 		.name = "Lattice ECP3-17",
61 		.name = "Lattice ECP3-35",
67 	struct spi_device *spi = (struct spi_device *)context;  in firmware_load()  local
68 	struct fpga_data *data = spi_get_drvdata(spi);  in firmware_load()
78 		dev_err(&spi->dev, "Cannot load firmware, aborting\n");  in firmware_load()
82 	if (fw->size == 0) {  in firmware_load()
83 		dev_err(&spi->dev, "Error: Firmware size is 0!\n");  in firmware_load()
92 	/* Trying to speak with the FPGA via SPI... */  in firmware_load()
94 	spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);  in firmware_load()
96 	dev_dbg(&spi->dev, "FPGA JTAG ID=%08x\n", jedec_id);  in firmware_load()
103 		dev_err(&spi->dev,  in firmware_load()
109 	dev_info(&spi->dev, "FPGA %s detected\n", ecp3_dev[i].name);  in firmware_load()
112 	spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);  in firmware_load()
114 	dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);  in firmware_load()
116 	buffer = kzalloc(fw->size + 8, GFP_KERNEL);  in firmware_load()
118 		dev_err(&spi->dev, "Error: Can't allocate memory!\n");  in firmware_load()
123 	 * Insert WRITE_INC command into stream (one SPI frame)  in firmware_load()
129 	memcpy(buffer + 4, fw->data, fw->size);  in firmware_load()
132 	spi_write(spi, txbuf, 4);  in firmware_load()
135 	spi_write(spi, txbuf, 4);  in firmware_load()
138 	spi_write(spi, txbuf, 4);  in firmware_load()
145 		spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);  in firmware_load()
154 		dev_err(&spi->dev,  in firmware_load()
161 	dev_info(&spi->dev, "Configuring the FPGA...\n");  in firmware_load()
162 	spi_write(spi, buffer, fw->size + 8);  in firmware_load()
165 	spi_write(spi, txbuf, 4);  in firmware_load()
168 	spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);  in firmware_load()
170 	dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);  in firmware_load()
174 		dev_info(&spi->dev, "FPGA successfully configured!\n");  in firmware_load()
176 		dev_info(&spi->dev, "FPGA not configured (DONE not set)\n");  in firmware_load()
185 	complete(&data->fw_loaded);  in firmware_load()
188 static int lattice_ecp3_probe(struct spi_device *spi)  in lattice_ecp3_probe()  argument
193 	data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);  in lattice_ecp3_probe()
195 		dev_err(&spi->dev, "Memory allocation for fpga_data failed\n");  in lattice_ecp3_probe()
196 		return -ENOMEM;  in lattice_ecp3_probe()
198 	spi_set_drvdata(spi, data);  in lattice_ecp3_probe()
200 	init_completion(&data->fw_loaded);  in lattice_ecp3_probe()
202 				      FIRMWARE_NAME, &spi->dev,  in lattice_ecp3_probe()
203 				      GFP_KERNEL, spi, firmware_load);  in lattice_ecp3_probe()
205 		dev_err(&spi->dev, "Firmware loading failed with %d!\n", err);  in lattice_ecp3_probe()
209 	dev_info(&spi->dev, "FPGA bitstream configuration driver registered\n");  in lattice_ecp3_probe()
214 static void lattice_ecp3_remove(struct spi_device *spi)  in lattice_ecp3_remove()  argument
216 	struct fpga_data *data = spi_get_drvdata(spi);  in lattice_ecp3_remove()
218 	wait_for_completion(&data->fw_loaded);  in lattice_ecp3_remove()
222 	{ "ecp3-17", 0 },
223 	{ "ecp3-35", 0 },
226 MODULE_DEVICE_TABLE(spi, lattice_ecp3_id);
230 		.name = "lattice-ecp3",
240 MODULE_DESCRIPTION("Lattice ECP3 FPGA configuration via SPI");