GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / fpga / zynqmp-fpga.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2019 Xilinx, Inc.
4  */
5
6 #include <linux/dma-mapping.h>
7 #include <linux/fpga/fpga-mgr.h>
8 #include <linux/io.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/of_address.h>
12 #include <linux/string.h>
13 #include <linux/firmware/xlnx-zynqmp.h>
14
15 /* Constant Definitions */
16 #define IXR_FPGA_DONE_MASK      BIT(3)
17
18 /**
19  * struct zynqmp_fpga_priv - Private data structure
20  * @dev:        Device data structure
21  * @flags:      flags which is used to identify the bitfile type
22  */
23 struct zynqmp_fpga_priv {
24         struct device *dev;
25         u32 flags;
26 };
27
28 static int zynqmp_fpga_ops_write_init(struct fpga_manager *mgr,
29                                       struct fpga_image_info *info,
30                                       const char *buf, size_t size)
31 {
32         struct zynqmp_fpga_priv *priv;
33
34         priv = mgr->priv;
35         priv->flags = info->flags;
36
37         return 0;
38 }
39
40 static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
41                                  const char *buf, size_t size)
42 {
43         struct zynqmp_fpga_priv *priv;
44         dma_addr_t dma_addr;
45         u32 eemi_flags = 0;
46         char *kbuf;
47         int ret;
48
49         priv = mgr->priv;
50
51         kbuf = dma_alloc_coherent(priv->dev, size, &dma_addr, GFP_KERNEL);
52         if (!kbuf)
53                 return -ENOMEM;
54
55         memcpy(kbuf, buf, size);
56
57         wmb(); /* ensure all writes are done before initiate FW call */
58
59         if (priv->flags & FPGA_MGR_PARTIAL_RECONFIG)
60                 eemi_flags |= XILINX_ZYNQMP_PM_FPGA_PARTIAL;
61
62         ret = zynqmp_pm_fpga_load(dma_addr, size, eemi_flags);
63
64         dma_free_coherent(priv->dev, size, kbuf, dma_addr);
65
66         return ret;
67 }
68
69 static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
70 {
71         u32 status = 0;
72
73         zynqmp_pm_fpga_get_status(&status);
74         if (status & IXR_FPGA_DONE_MASK)
75                 return FPGA_MGR_STATE_OPERATING;
76
77         return FPGA_MGR_STATE_UNKNOWN;
78 }
79
80 static const struct fpga_manager_ops zynqmp_fpga_ops = {
81         .state = zynqmp_fpga_ops_state,
82         .write_init = zynqmp_fpga_ops_write_init,
83         .write = zynqmp_fpga_ops_write,
84 };
85
86 static int zynqmp_fpga_probe(struct platform_device *pdev)
87 {
88         struct device *dev = &pdev->dev;
89         struct zynqmp_fpga_priv *priv;
90         struct fpga_manager *mgr;
91
92         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
93         if (!priv)
94                 return -ENOMEM;
95
96         priv->dev = dev;
97
98         mgr = devm_fpga_mgr_register(dev, "Xilinx ZynqMP FPGA Manager",
99                                      &zynqmp_fpga_ops, priv);
100         return PTR_ERR_OR_ZERO(mgr);
101 }
102
103 #ifdef CONFIG_OF
104 static const struct of_device_id zynqmp_fpga_of_match[] = {
105         { .compatible = "xlnx,zynqmp-pcap-fpga", },
106         {},
107 };
108 MODULE_DEVICE_TABLE(of, zynqmp_fpga_of_match);
109 #endif
110
111 static struct platform_driver zynqmp_fpga_driver = {
112         .probe = zynqmp_fpga_probe,
113         .driver = {
114                 .name = "zynqmp_fpga_manager",
115                 .of_match_table = of_match_ptr(zynqmp_fpga_of_match),
116         },
117 };
118
119 module_platform_driver(zynqmp_fpga_driver);
120
121 MODULE_AUTHOR("Nava kishore Manne <navam@xilinx.com>");
122 MODULE_DESCRIPTION("Xilinx ZynqMp FPGA Manager");
123 MODULE_LICENSE("GPL");