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/of.h> 17 #include <linux/spi/spi.h> 18 19 static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf, 20 size_t count) 21 { 22 struct spi_device *spi = to_spi_device(core->dev); 23 const char *fw_data = buf; 24 const char *fw_data_end = fw_data + count; 25 26 while (fw_data < fw_data_end) { 27 size_t remaining, stride; 28 int ret; 29 30 remaining = fw_data_end - fw_data; 31 stride = min_t(size_t, remaining, SZ_4K); 32 33 ret = spi_write(spi, fw_data, stride); 34 if (ret) { 35 dev_err(core->dev, "SPI error in firmware write: %d\n", 36 ret); 37 return ret; 38 } 39 fw_data += stride; 40 } 41 42 return 0; 43 } 44 45 static int xilinx_spi_probe(struct spi_device *spi) 46 { 47 struct xilinx_fpga_core *core; 48 49 core = devm_kzalloc(&spi->dev, sizeof(*core), GFP_KERNEL); 50 if (!core) 51 return -ENOMEM; 52 53 core->dev = &spi->dev; 54 core->write = xilinx_spi_write; 55 56 return xilinx_core_probe(core); 57 } 58 59 static const struct spi_device_id xilinx_spi_ids[] = { 60 { "fpga-slave-serial" }, 61 { }, 62 }; 63 MODULE_DEVICE_TABLE(spi, xilinx_spi_ids); 64 65 #ifdef CONFIG_OF 66 static const struct of_device_id xlnx_spi_of_match[] = { 67 { 68 .compatible = "xlnx,fpga-slave-serial", 69 }, 70 {} 71 }; 72 MODULE_DEVICE_TABLE(of, xlnx_spi_of_match); 73 #endif 74 75 static struct spi_driver xilinx_slave_spi_driver = { 76 .driver = { 77 .name = "xlnx-slave-spi", 78 .of_match_table = of_match_ptr(xlnx_spi_of_match), 79 }, 80 .probe = xilinx_spi_probe, 81 .id_table = xilinx_spi_ids, 82 }; 83 84 module_spi_driver(xilinx_slave_spi_driver) 85 86 MODULE_LICENSE("GPL v2"); 87 MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>"); 88 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI"); 89