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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Xilinx Spartan6 and 7 Series SelectMAP interface driver4 *5 * (C) 2024 Charles Perry <charles.perry@savoirfairelinux.com>6 *7 * Manage Xilinx FPGA firmware loaded over the SelectMAP configuration8 * interface.9 */10 11#include "xilinx-core.h"12 13#include <linux/gpio/consumer.h>14#include <linux/io.h>15#include <linux/module.h>16#include <linux/mod_devicetable.h>17#include <linux/of.h>18#include <linux/platform_device.h>19 20struct xilinx_selectmap_conf {21 struct xilinx_fpga_core core;22 void __iomem *base;23};24 25#define to_xilinx_selectmap_conf(obj) \26 container_of(obj, struct xilinx_selectmap_conf, core)27 28static int xilinx_selectmap_write(struct xilinx_fpga_core *core,29 const char *buf, size_t count)30{31 struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core);32 size_t i;33 34 for (i = 0; i < count; ++i)35 writeb(buf[i], conf->base);36 37 return 0;38}39 40static int xilinx_selectmap_probe(struct platform_device *pdev)41{42 struct xilinx_selectmap_conf *conf;43 struct gpio_desc *gpio;44 void __iomem *base;45 46 conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);47 if (!conf)48 return -ENOMEM;49 50 conf->core.dev = &pdev->dev;51 conf->core.write = xilinx_selectmap_write;52 53 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);54 if (IS_ERR(base))55 return dev_err_probe(&pdev->dev, PTR_ERR(base),56 "ioremap error\n");57 conf->base = base;58 59 /* CSI_B is active low */60 gpio = devm_gpiod_get_optional(&pdev->dev, "csi", GPIOD_OUT_HIGH);61 if (IS_ERR(gpio))62 return dev_err_probe(&pdev->dev, PTR_ERR(gpio),63 "Failed to get CSI_B gpio\n");64 65 /* RDWR_B is active low */66 gpio = devm_gpiod_get_optional(&pdev->dev, "rdwr", GPIOD_OUT_HIGH);67 if (IS_ERR(gpio))68 return dev_err_probe(&pdev->dev, PTR_ERR(gpio),69 "Failed to get RDWR_B gpio\n");70 71 return xilinx_core_probe(&conf->core);72}73 74static const struct of_device_id xlnx_selectmap_of_match[] = {75 { .compatible = "xlnx,fpga-xc7s-selectmap", }, // Spartan-776 { .compatible = "xlnx,fpga-xc7a-selectmap", }, // Artix-777 { .compatible = "xlnx,fpga-xc7k-selectmap", }, // Kintex-778 { .compatible = "xlnx,fpga-xc7v-selectmap", }, // Virtex-779 {},80};81MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match);82 83static struct platform_driver xilinx_selectmap_driver = {84 .driver = {85 .name = "xilinx-selectmap",86 .of_match_table = xlnx_selectmap_of_match,87 },88 .probe = xilinx_selectmap_probe,89};90 91module_platform_driver(xilinx_selectmap_driver);92 93MODULE_LICENSE("GPL");94MODULE_AUTHOR("Charles Perry <charles.perry@savoirfairelinux.com>");95MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");96