96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Xilinx Spartan6 and 7 Series SelectMAP interface driver
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*
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* (C) 2024 Charles Perry <charles.perry@savoirfairelinux.com>
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*
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* Manage Xilinx FPGA firmware loaded over the SelectMAP configuration
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* interface.
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*/
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#include "xilinx-core.h"
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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struct xilinx_selectmap_conf {
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struct xilinx_fpga_core core;
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void __iomem *base;
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};
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#define to_xilinx_selectmap_conf(obj) \
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container_of(obj, struct xilinx_selectmap_conf, core)
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static int xilinx_selectmap_write(struct xilinx_fpga_core *core,
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const char *buf, size_t count)
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{
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struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core);
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size_t i;
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for (i = 0; i < count; ++i)
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writeb(buf[i], conf->base);
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return 0;
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}
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static int xilinx_selectmap_probe(struct platform_device *pdev)
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{
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struct xilinx_selectmap_conf *conf;
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struct gpio_desc *gpio;
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void __iomem *base;
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conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);
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if (!conf)
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return -ENOMEM;
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conf->core.dev = &pdev->dev;
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conf->core.write = xilinx_selectmap_write;
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base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
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if (IS_ERR(base))
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return dev_err_probe(&pdev->dev, PTR_ERR(base),
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"ioremap error\n");
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conf->base = base;
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/* CSI_B is active low */
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gpio = devm_gpiod_get_optional(&pdev->dev, "csi", GPIOD_OUT_HIGH);
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if (IS_ERR(gpio))
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return dev_err_probe(&pdev->dev, PTR_ERR(gpio),
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"Failed to get CSI_B gpio\n");
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/* RDWR_B is active low */
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gpio = devm_gpiod_get_optional(&pdev->dev, "rdwr", GPIOD_OUT_HIGH);
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if (IS_ERR(gpio))
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return dev_err_probe(&pdev->dev, PTR_ERR(gpio),
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"Failed to get RDWR_B gpio\n");
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return xilinx_core_probe(&conf->core);
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}
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static const struct of_device_id xlnx_selectmap_of_match[] = {
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{ .compatible = "xlnx,fpga-xc7s-selectmap", }, // Spartan-7
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{ .compatible = "xlnx,fpga-xc7a-selectmap", }, // Artix-7
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{ .compatible = "xlnx,fpga-xc7k-selectmap", }, // Kintex-7
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{ .compatible = "xlnx,fpga-xc7v-selectmap", }, // Virtex-7
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{},
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};
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MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match);
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static struct platform_driver xilinx_selectmap_driver = {
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.driver = {
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.name = "xilinx-selectmap",
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.of_match_table = xlnx_selectmap_of_match,
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},
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.probe = xilinx_selectmap_probe,
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};
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module_platform_driver(xilinx_selectmap_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Charles Perry <charles.perry@savoirfairelinux.com>");
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MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");
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