1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx FPGA AFI driver.
* Copyright (c) 2018 Xilinx Inc.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
/* Registers and special values for doing register-based operations */
#define AFI_RDCHAN_CTRL_OFFSET 0x00
#define AFI_WRCHAN_CTRL_OFFSET 0x14
#define AFI_BUSWIDTH_MASK 0x01
/**
* struct afi_fpga - AFI register description
* @membase: pointer to register struct
* @afi_width: AFI bus width to be written
*/
struct zynq_afi_fpga {
void __iomem *membase;
u32 afi_width;
};
static int zynq_afi_fpga_probe(struct platform_device *pdev)
{
struct zynq_afi_fpga *afi_fpga;
struct resource *res;
u32 reg_val;
u32 val;
afi_fpga = devm_kzalloc(&pdev->dev, sizeof(*afi_fpga), GFP_KERNEL);
if (!afi_fpga)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
afi_fpga->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(afi_fpga->membase))
return PTR_ERR(afi_fpga->membase);
val = device_property_read_u32(&pdev->dev, "xlnx,afi-width",
&afi_fpga->afi_width);
if (val) {
dev_err(&pdev->dev, "Fail to get the afi bus width\n");
return -EINVAL;
}
reg_val = readl(afi_fpga->membase + AFI_RDCHAN_CTRL_OFFSET);
reg_val &= ~AFI_BUSWIDTH_MASK;
writel(reg_val | afi_fpga->afi_width,
afi_fpga->membase + AFI_RDCHAN_CTRL_OFFSET);
reg_val = readl(afi_fpga->membase + AFI_WRCHAN_CTRL_OFFSET);
reg_val &= ~AFI_BUSWIDTH_MASK;
writel(reg_val | afi_fpga->afi_width,
afi_fpga->membase + AFI_WRCHAN_CTRL_OFFSET);
return 0;
}
static const struct of_device_id zynq_afi_fpga_ids[] = {
{ .compatible = "xlnx,zynq-afi-fpga" },
{ },
};
MODULE_DEVICE_TABLE(of, zynq_afi_fpga_ids);
static struct platform_driver zynq_afi_fpga_driver = {
.driver = {
.name = "zynq-afi-fpga",
.of_match_table = zynq_afi_fpga_ids,
},
.probe = zynq_afi_fpga_probe,
};
module_platform_driver(zynq_afi_fpga_driver);
MODULE_DESCRIPTION("ZYNQ FPGA AFI module");
MODULE_AUTHOR("Nava kishore Manne <nava.manne@xilinx.com>");
MODULE_LICENSE("GPL v2");
|
