1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Xilinx Spartan6 and 7 Series Slave Serial SPI Driver 4 * 5 * Copyright (C) 2017 DENX Software Engineering 6 * 7 * Anatolij Gustschin <agust@denx.de> 8 * 9 * Manage Xilinx FPGA firmware that is loaded over SPI using 10 * the slave serial configuration interface. 11 */ 12 13 #include "xilinx-core.h" 14 15 #include <linux/module.h> 16 #include <linux/mod_devicetable.h> 17 #include <linux/of.h> 18 #include <linux/spi/spi.h> 19 20 static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf, 21 size_t count) 22 { 23 struct spi_device *spi = to_spi_device(core->dev); 24 const char *fw_data = buf; 25 const char *fw_data_end = fw_data + count; 26 27 while (fw_data < fw_data_end) { 28 size_t remaining, stride; 29 int ret; 30 31 remaining = fw_data_end - fw_data; 32 stride = min_t(size_t, remaining, SZ_4K); 33 34 ret = spi_write(spi, fw_data, stride); 35 if (ret) { 36 dev_err(core->dev, "SPI error in firmware write: %d\n", 37 ret); 38 return ret; 39 } 40 fw_data += stride; 41 } 42 43 return 0; 44 } 45 46 static int xilinx_spi_probe(struct spi_device *spi) 47 { 48 struct xilinx_fpga_core *core; 49 50 core = devm_kzalloc(&spi->dev, sizeof(*core), GFP_KERNEL); 51 if (!core) 52 return -ENOMEM; 53 54 core->dev = &spi->dev; 55 core->write = xilinx_spi_write; 56 57 return xilinx_core_probe(core); 58 } 59 60 #ifdef CONFIG_OF 61 static const struct of_device_id xlnx_spi_of_match[] = { 62 { 63 .compatible = "xlnx,fpga-slave-serial", 64 }, 65 {} 66 }; 67 MODULE_DEVICE_TABLE(of, xlnx_spi_of_match); 68 #endif 69 70 static struct spi_driver xilinx_slave_spi_driver = { 71 .driver = { 72 .name = "xlnx-slave-spi", 73 .of_match_table = of_match_ptr(xlnx_spi_of_match), 74 }, 75 .probe = xilinx_spi_probe, 76 }; 77 78 module_spi_driver(xilinx_slave_spi_driver) 79 80 MODULE_LICENSE("GPL v2"); 81 MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>"); 82 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI"); 83