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
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-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};
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