This source file includes following definitions.
- file_aspeed_lpc_ctrl
- aspeed_lpc_ctrl_mmap
- aspeed_lpc_ctrl_ioctl
- aspeed_lpc_ctrl_probe
- aspeed_lpc_ctrl_remove
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6 #include <linux/clk.h>
7 #include <linux/mfd/syscon.h>
8 #include <linux/miscdevice.h>
9 #include <linux/mm.h>
10 #include <linux/module.h>
11 #include <linux/of_address.h>
12 #include <linux/platform_device.h>
13 #include <linux/poll.h>
14 #include <linux/regmap.h>
15
16 #include <linux/aspeed-lpc-ctrl.h>
17
18 #define DEVICE_NAME "aspeed-lpc-ctrl"
19
20 #define HICR5 0x0
21 #define HICR5_ENL2H BIT(8)
22 #define HICR5_ENFWH BIT(10)
23
24 #define HICR7 0x8
25 #define HICR8 0xc
26
27 struct aspeed_lpc_ctrl {
28 struct miscdevice miscdev;
29 struct regmap *regmap;
30 struct clk *clk;
31 phys_addr_t mem_base;
32 resource_size_t mem_size;
33 u32 pnor_size;
34 u32 pnor_base;
35 };
36
37 static struct aspeed_lpc_ctrl *file_aspeed_lpc_ctrl(struct file *file)
38 {
39 return container_of(file->private_data, struct aspeed_lpc_ctrl,
40 miscdev);
41 }
42
43 static int aspeed_lpc_ctrl_mmap(struct file *file, struct vm_area_struct *vma)
44 {
45 struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file);
46 unsigned long vsize = vma->vm_end - vma->vm_start;
47 pgprot_t prot = vma->vm_page_prot;
48
49 if (vma->vm_pgoff + vsize > lpc_ctrl->mem_base + lpc_ctrl->mem_size)
50 return -EINVAL;
51
52
53 prot = pgprot_noncached(prot);
54
55 if (remap_pfn_range(vma, vma->vm_start,
56 (lpc_ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff,
57 vsize, prot))
58 return -EAGAIN;
59
60 return 0;
61 }
62
63 static long aspeed_lpc_ctrl_ioctl(struct file *file, unsigned int cmd,
64 unsigned long param)
65 {
66 struct aspeed_lpc_ctrl *lpc_ctrl = file_aspeed_lpc_ctrl(file);
67 struct device *dev = file->private_data;
68 void __user *p = (void __user *)param;
69 struct aspeed_lpc_ctrl_mapping map;
70 u32 addr;
71 u32 size;
72 long rc;
73
74 if (copy_from_user(&map, p, sizeof(map)))
75 return -EFAULT;
76
77 if (map.flags != 0)
78 return -EINVAL;
79
80 switch (cmd) {
81 case ASPEED_LPC_CTRL_IOCTL_GET_SIZE:
82
83 if (map.window_type != ASPEED_LPC_CTRL_WINDOW_MEMORY)
84 return -EINVAL;
85
86
87 if (map.window_id != 0)
88 return -EINVAL;
89
90
91 if (!lpc_ctrl->mem_size) {
92 dev_dbg(dev, "Didn't find reserved memory\n");
93 return -ENXIO;
94 }
95
96 map.size = lpc_ctrl->mem_size;
97
98 return copy_to_user(p, &map, sizeof(map)) ? -EFAULT : 0;
99 case ASPEED_LPC_CTRL_IOCTL_MAP:
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119
120
121 if ((map.size & 0x0000ffff) || (map.offset & 0x0000ffff))
122 return -EINVAL;
123
124
125
126
127
128 if (map.offset & (map.size - 1))
129 return -EINVAL;
130
131 if (map.window_type == ASPEED_LPC_CTRL_WINDOW_FLASH) {
132 if (!lpc_ctrl->pnor_size) {
133 dev_dbg(dev, "Didn't find host pnor flash\n");
134 return -ENXIO;
135 }
136 addr = lpc_ctrl->pnor_base;
137 size = lpc_ctrl->pnor_size;
138 } else if (map.window_type == ASPEED_LPC_CTRL_WINDOW_MEMORY) {
139
140 if (!lpc_ctrl->mem_size) {
141 dev_dbg(dev, "Didn't find reserved memory\n");
142 return -ENXIO;
143 }
144 addr = lpc_ctrl->mem_base;
145 size = lpc_ctrl->mem_size;
146 } else {
147 return -EINVAL;
148 }
149
150
151 if (map.offset + map.size < map.offset ||
152 map.offset + map.size > size)
153 return -EINVAL;
154
155 if (map.size == 0 || map.size > size)
156 return -EINVAL;
157
158 addr += map.offset;
159
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168
169 rc = regmap_write(lpc_ctrl->regmap, HICR7,
170 (addr | (map.addr >> 16)));
171 if (rc)
172 return rc;
173
174 rc = regmap_write(lpc_ctrl->regmap, HICR8,
175 (~(map.size - 1)) | ((map.size >> 16) - 1));
176 if (rc)
177 return rc;
178
179
180
181
182
183 return regmap_update_bits(lpc_ctrl->regmap, HICR5,
184 HICR5_ENFWH | HICR5_ENL2H,
185 HICR5_ENFWH | HICR5_ENL2H);
186 }
187
188 return -EINVAL;
189 }
190
191 static const struct file_operations aspeed_lpc_ctrl_fops = {
192 .owner = THIS_MODULE,
193 .mmap = aspeed_lpc_ctrl_mmap,
194 .unlocked_ioctl = aspeed_lpc_ctrl_ioctl,
195 };
196
197 static int aspeed_lpc_ctrl_probe(struct platform_device *pdev)
198 {
199 struct aspeed_lpc_ctrl *lpc_ctrl;
200 struct device_node *node;
201 struct resource resm;
202 struct device *dev;
203 int rc;
204
205 dev = &pdev->dev;
206
207 lpc_ctrl = devm_kzalloc(dev, sizeof(*lpc_ctrl), GFP_KERNEL);
208 if (!lpc_ctrl)
209 return -ENOMEM;
210
211
212 node = of_parse_phandle(dev->of_node, "flash", 0);
213 if (!node) {
214 dev_dbg(dev, "Didn't find host pnor flash node\n");
215 } else {
216 rc = of_address_to_resource(node, 1, &resm);
217 of_node_put(node);
218 if (rc) {
219 dev_err(dev, "Couldn't address to resource for flash\n");
220 return rc;
221 }
222
223 lpc_ctrl->pnor_size = resource_size(&resm);
224 lpc_ctrl->pnor_base = resm.start;
225 }
226
227
228 dev_set_drvdata(&pdev->dev, lpc_ctrl);
229
230
231 node = of_parse_phandle(dev->of_node, "memory-region", 0);
232 if (!node) {
233 dev_dbg(dev, "Didn't find reserved memory\n");
234 } else {
235 rc = of_address_to_resource(node, 0, &resm);
236 of_node_put(node);
237 if (rc) {
238 dev_err(dev, "Couldn't address to resource for reserved memory\n");
239 return -ENXIO;
240 }
241
242 lpc_ctrl->mem_size = resource_size(&resm);
243 lpc_ctrl->mem_base = resm.start;
244 }
245
246 lpc_ctrl->regmap = syscon_node_to_regmap(
247 pdev->dev.parent->of_node);
248 if (IS_ERR(lpc_ctrl->regmap)) {
249 dev_err(dev, "Couldn't get regmap\n");
250 return -ENODEV;
251 }
252
253 lpc_ctrl->clk = devm_clk_get(dev, NULL);
254 if (IS_ERR(lpc_ctrl->clk)) {
255 dev_err(dev, "couldn't get clock\n");
256 return PTR_ERR(lpc_ctrl->clk);
257 }
258 rc = clk_prepare_enable(lpc_ctrl->clk);
259 if (rc) {
260 dev_err(dev, "couldn't enable clock\n");
261 return rc;
262 }
263
264 lpc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;
265 lpc_ctrl->miscdev.name = DEVICE_NAME;
266 lpc_ctrl->miscdev.fops = &aspeed_lpc_ctrl_fops;
267 lpc_ctrl->miscdev.parent = dev;
268 rc = misc_register(&lpc_ctrl->miscdev);
269 if (rc) {
270 dev_err(dev, "Unable to register device\n");
271 goto err;
272 }
273
274 return 0;
275
276 err:
277 clk_disable_unprepare(lpc_ctrl->clk);
278 return rc;
279 }
280
281 static int aspeed_lpc_ctrl_remove(struct platform_device *pdev)
282 {
283 struct aspeed_lpc_ctrl *lpc_ctrl = dev_get_drvdata(&pdev->dev);
284
285 misc_deregister(&lpc_ctrl->miscdev);
286 clk_disable_unprepare(lpc_ctrl->clk);
287
288 return 0;
289 }
290
291 static const struct of_device_id aspeed_lpc_ctrl_match[] = {
292 { .compatible = "aspeed,ast2400-lpc-ctrl" },
293 { .compatible = "aspeed,ast2500-lpc-ctrl" },
294 { },
295 };
296
297 static struct platform_driver aspeed_lpc_ctrl_driver = {
298 .driver = {
299 .name = DEVICE_NAME,
300 .of_match_table = aspeed_lpc_ctrl_match,
301 },
302 .probe = aspeed_lpc_ctrl_probe,
303 .remove = aspeed_lpc_ctrl_remove,
304 };
305
306 module_platform_driver(aspeed_lpc_ctrl_driver);
307
308 MODULE_DEVICE_TABLE(of, aspeed_lpc_ctrl_match);
309 MODULE_LICENSE("GPL");
310 MODULE_AUTHOR("Cyril Bur <cyrilbur@gmail.com>");
311 MODULE_DESCRIPTION("Control for aspeed 2400/2500 LPC HOST to BMC mappings");