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/mod_devicetable.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19
20 struct 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
xilinx_selectmap_write(struct xilinx_fpga_core * core,const char * buf,size_t count)28 static 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
xilinx_selectmap_probe(struct platform_device * pdev)40 static 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
74 static const struct of_device_id xlnx_selectmap_of_match[] = {
75 { .compatible = "xlnx,fpga-xc7s-selectmap", }, // Spartan-7
76 { .compatible = "xlnx,fpga-xc7a-selectmap", }, // Artix-7
77 { .compatible = "xlnx,fpga-xc7k-selectmap", }, // Kintex-7
78 { .compatible = "xlnx,fpga-xc7v-selectmap", }, // Virtex-7
79 {},
80 };
81 MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match);
82
83 static 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
91 module_platform_driver(xilinx_selectmap_driver);
92
93 MODULE_LICENSE("GPL");
94 MODULE_AUTHOR("Charles Perry <charles.perry@savoirfairelinux.com>");
95 MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");
96