1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Xilinx Spartan6 and 7 Series SelectMAP interface driver
4 *
5 * (C) 2024 Charles Perry <charles.perry@savoirfairelinux.com>
6 *
7 * Manage Xilinx FPGA firmware loaded over the SelectMAP configuration
8 * 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/of.h>
17 #include <linux/platform_device.h>
18
19 struct xilinx_selectmap_conf {
20 struct xilinx_fpga_core core;
21 void __iomem *base;
22 };
23
24 #define to_xilinx_selectmap_conf(obj) \
25 container_of(obj, struct xilinx_selectmap_conf, core)
26
xilinx_selectmap_write(struct xilinx_fpga_core * core,const char * buf,size_t count)27 static int xilinx_selectmap_write(struct xilinx_fpga_core *core,
28 const char *buf, size_t count)
29 {
30 struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core);
31 size_t i;
32
33 for (i = 0; i < count; ++i)
34 writeb(buf[i], conf->base);
35
36 return 0;
37 }
38
xilinx_selectmap_probe(struct platform_device * pdev)39 static int xilinx_selectmap_probe(struct platform_device *pdev)
40 {
41 struct xilinx_selectmap_conf *conf;
42 struct gpio_desc *gpio;
43 void __iomem *base;
44
45 conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);
46 if (!conf)
47 return -ENOMEM;
48
49 conf->core.dev = &pdev->dev;
50 conf->core.write = xilinx_selectmap_write;
51
52 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
53 if (IS_ERR(base))
54 return dev_err_probe(&pdev->dev, PTR_ERR(base),
55 "ioremap error\n");
56 conf->base = base;
57
58 /* CSI_B is active low */
59 gpio = devm_gpiod_get_optional(&pdev->dev, "csi", GPIOD_OUT_HIGH);
60 if (IS_ERR(gpio))
61 return dev_err_probe(&pdev->dev, PTR_ERR(gpio),
62 "Failed to get CSI_B gpio\n");
63
64 /* RDWR_B is active low */
65 gpio = devm_gpiod_get_optional(&pdev->dev, "rdwr", GPIOD_OUT_HIGH);
66 if (IS_ERR(gpio))
67 return dev_err_probe(&pdev->dev, PTR_ERR(gpio),
68 "Failed to get RDWR_B gpio\n");
69
70 return xilinx_core_probe(&conf->core);
71 }
72
73 static const struct of_device_id xlnx_selectmap_of_match[] = {
74 { .compatible = "xlnx,fpga-xc7s-selectmap", }, // Spartan-7
75 { .compatible = "xlnx,fpga-xc7a-selectmap", }, // Artix-7
76 { .compatible = "xlnx,fpga-xc7k-selectmap", }, // Kintex-7
77 { .compatible = "xlnx,fpga-xc7v-selectmap", }, // Virtex-7
78 {},
79 };
80 MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match);
81
82 static struct platform_driver xilinx_selectmap_driver = {
83 .driver = {
84 .name = "xilinx-selectmap",
85 .of_match_table = xlnx_selectmap_of_match,
86 },
87 .probe = xilinx_selectmap_probe,
88 };
89
90 module_platform_driver(xilinx_selectmap_driver);
91
92 MODULE_LICENSE("GPL");
93 MODULE_AUTHOR("Charles Perry <charles.perry@savoirfairelinux.com>");
94 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");
95