GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mcb / mcb-lpc.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * MEN Chameleon Bus.
4  *
5  * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
6  * Author: Andreas Werner <andreas.werner@men.de>
7  */
8
9 #include <linux/platform_device.h>
10 #include <linux/module.h>
11 #include <linux/dmi.h>
12 #include <linux/mcb.h>
13 #include <linux/io.h>
14 #include "mcb-internal.h"
15
16 struct priv {
17         struct mcb_bus *bus;
18         struct resource *mem;
19         void __iomem *base;
20 };
21
22 static int mcb_lpc_probe(struct platform_device *pdev)
23 {
24         struct resource *res;
25         struct priv *priv;
26         int ret = 0;
27
28         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
29         if (!priv)
30                 return -ENOMEM;
31
32         priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
33         if (!priv->mem) {
34                 dev_err(&pdev->dev, "No Memory resource\n");
35                 return -ENODEV;
36         }
37
38         res = devm_request_mem_region(&pdev->dev, priv->mem->start,
39                                       resource_size(priv->mem),
40                                       KBUILD_MODNAME);
41         if (!res) {
42                 dev_err(&pdev->dev, "Failed to request IO memory\n");
43                 return -EBUSY;
44         }
45
46         priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
47                                   resource_size(priv->mem));
48         if (!priv->base) {
49                 dev_err(&pdev->dev, "Cannot ioremap\n");
50                 return -ENOMEM;
51         }
52
53         platform_set_drvdata(pdev, priv);
54
55         priv->bus = mcb_alloc_bus(&pdev->dev);
56         if (IS_ERR(priv->bus))
57                 return PTR_ERR(priv->bus);
58
59         ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
60         if (ret < 0) {
61                 mcb_release_bus(priv->bus);
62                 return ret;
63         }
64
65         dev_dbg(&pdev->dev, "Found %d cells\n", ret);
66
67         mcb_bus_add_devices(priv->bus);
68
69         return 0;
70
71 }
72
73 static int mcb_lpc_remove(struct platform_device *pdev)
74 {
75         struct priv *priv = platform_get_drvdata(pdev);
76
77         mcb_release_bus(priv->bus);
78
79         return 0;
80 }
81
82 static struct platform_device *mcb_lpc_pdev;
83
84 static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
85 {
86         struct resource *res = id->driver_data;
87         int ret;
88
89         mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
90         if (!mcb_lpc_pdev)
91                 return -ENOMEM;
92
93         ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
94         if (ret)
95                 goto out_put;
96
97         ret = platform_device_add(mcb_lpc_pdev);
98         if (ret)
99                 goto out_put;
100
101         return 0;
102
103 out_put:
104         platform_device_put(mcb_lpc_pdev);
105         return ret;
106 }
107
108 static struct resource sc24_fpga_resource = DEFINE_RES_MEM(0xe000e000, CHAM_HEADER_SIZE);
109 static struct resource sc31_fpga_resource = DEFINE_RES_MEM(0xf000e000, CHAM_HEADER_SIZE);
110
111 static struct platform_driver mcb_lpc_driver = {
112         .driver         = {
113                 .name = "mcb-lpc",
114         },
115         .probe          = mcb_lpc_probe,
116         .remove         = mcb_lpc_remove,
117 };
118
119 static const struct dmi_system_id mcb_lpc_dmi_table[] = {
120         {
121                 .ident = "SC24",
122                 .matches = {
123                         DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
124                         DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
125                 },
126                 .driver_data = (void *)&sc24_fpga_resource,
127                 .callback = mcb_lpc_create_platform_device,
128         },
129         {
130                 .ident = "SC31",
131                 .matches = {
132                         DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
133                         DMI_MATCH(DMI_PRODUCT_VERSION, "14SC31"),
134                 },
135                 .driver_data = (void *)&sc31_fpga_resource,
136                 .callback = mcb_lpc_create_platform_device,
137         },
138         {}
139 };
140 MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
141
142 static int __init mcb_lpc_init(void)
143 {
144         if (!dmi_check_system(mcb_lpc_dmi_table))
145                 return -ENODEV;
146
147         return platform_driver_register(&mcb_lpc_driver);
148 }
149
150 static void __exit mcb_lpc_exit(void)
151 {
152         platform_device_unregister(mcb_lpc_pdev);
153         platform_driver_unregister(&mcb_lpc_driver);
154 }
155
156 module_init(mcb_lpc_init);
157 module_exit(mcb_lpc_exit);
158
159 MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
160 MODULE_LICENSE("GPL");
161 MODULE_DESCRIPTION("MCB over LPC support");
162 MODULE_IMPORT_NS(MCB);