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1 | /* |
2 | * WHCI UWB Multi-interface Controller enumerator. |
3 | * |
4 | * Copyright (C) 2007 Cambridge Silicon Radio Ltd. |
5 | * |
6 | * This file is released under the GNU GPL v2. |
7 | */ |
8 | #include <linux/delay.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/pci.h> |
12 | #include <linux/dma-mapping.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/uwb/whci.h> |
15 | #include <linux/uwb/umc.h> |
16 | |
17 | struct whci_card { |
18 | struct pci_dev *pci; |
19 | void __iomem *uwbbase; |
20 | u8 n_caps; |
21 | struct umc_dev *devs[0]; |
22 | }; |
23 | |
24 | |
25 | /* Fix faulty HW :( */ |
26 | static |
27 | u64 whci_capdata_quirks(struct whci_card *card, u64 capdata) |
28 | { |
29 | u64 capdata_orig = capdata; |
30 | struct pci_dev *pci_dev = card->pci; |
31 | if (pci_dev->vendor == PCI_VENDOR_ID_INTEL |
32 | && (pci_dev->device == 0x0c3b || pci_dev->device == 0004) |
33 | && pci_dev->class == 0x0d1010) { |
34 | switch (UWBCAPDATA_TO_CAP_ID(capdata)) { |
35 | /* WLP capability has 0x100 bytes of aperture */ |
36 | case 0x80: |
37 | capdata |= 0x40 << 8; break; |
38 | /* WUSB capability has 0x80 bytes of aperture |
39 | * and ID is 1 */ |
40 | case 0x02: |
41 | capdata &= ~0xffff; |
42 | capdata |= 0x2001; |
43 | break; |
44 | } |
45 | } |
46 | if (capdata_orig != capdata) |
47 | dev_warn(&pci_dev->dev, |
48 | "PCI v%04x d%04x c%06x#%02x: " |
49 | "corrected capdata from %016Lx to %016Lx\n", |
50 | pci_dev->vendor, pci_dev->device, pci_dev->class, |
51 | (unsigned)UWBCAPDATA_TO_CAP_ID(capdata), |
52 | (unsigned long long)capdata_orig, |
53 | (unsigned long long)capdata); |
54 | return capdata; |
55 | } |
56 | |
57 | |
58 | /** |
59 | * whci_wait_for - wait for a WHCI register to be set |
60 | * |
61 | * Polls (for at most @max_ms ms) until '*@reg & @mask == @result'. |
62 | */ |
63 | int whci_wait_for(struct device *dev, u32 __iomem *reg, u32 mask, u32 result, |
64 | unsigned long max_ms, const char *tag) |
65 | { |
66 | unsigned t = 0; |
67 | u32 val; |
68 | for (;;) { |
69 | val = le_readl(reg); |
70 | if ((val & mask) == result) |
71 | break; |
72 | if (t >= max_ms) { |
73 | dev_err(dev, "%s timed out\n", tag); |
74 | return -ETIMEDOUT; |
75 | } |
76 | msleep(10); |
77 | t += 10; |
78 | } |
79 | return 0; |
80 | } |
81 | EXPORT_SYMBOL_GPL(whci_wait_for); |
82 | |
83 | |
84 | /* |
85 | * NOTE: the capinfo and capdata registers are slightly different |
86 | * (size and cap-id fields). So for cap #0, we need to fill |
87 | * in. Size comes from the size of the register block |
88 | * (statically calculated); cap_id comes from nowhere, we use |
89 | * zero, that is reserved, for the radio controller, because |
90 | * none was defined at the spec level. |
91 | */ |
92 | static int whci_add_cap(struct whci_card *card, int n) |
93 | { |
94 | struct umc_dev *umc; |
95 | u64 capdata; |
96 | int bar, err; |
97 | |
98 | umc = umc_device_create(&card->pci->dev, n); |
99 | if (umc == NULL) |
100 | return -ENOMEM; |
101 | |
102 | capdata = le_readq(card->uwbbase + UWBCAPDATA(n)); |
103 | |
104 | bar = UWBCAPDATA_TO_BAR(capdata) << 1; |
105 | |
106 | capdata = whci_capdata_quirks(card, capdata); |
107 | /* Capability 0 is the radio controller. It's size is 32 |
108 | * bytes (WHCI0.95[2.3, T2-9]). */ |
109 | umc->version = UWBCAPDATA_TO_VERSION(capdata); |
110 | umc->cap_id = n == 0 ? 0 : UWBCAPDATA_TO_CAP_ID(capdata); |
111 | umc->bar = bar; |
112 | umc->resource.start = pci_resource_start(card->pci, bar) |
113 | + UWBCAPDATA_TO_OFFSET(capdata); |
114 | umc->resource.end = umc->resource.start |
115 | + (n == 0 ? 0x20 : UWBCAPDATA_TO_SIZE(capdata)) - 1; |
116 | umc->resource.name = dev_name(&umc->dev); |
117 | umc->resource.flags = card->pci->resource[bar].flags; |
118 | umc->resource.parent = &card->pci->resource[bar]; |
119 | umc->irq = card->pci->irq; |
120 | |
121 | err = umc_device_register(umc); |
122 | if (err < 0) |
123 | goto error; |
124 | card->devs[n] = umc; |
125 | return 0; |
126 | |
127 | error: |
128 | kfree(umc); |
129 | return err; |
130 | } |
131 | |
132 | static void whci_del_cap(struct whci_card *card, int n) |
133 | { |
134 | struct umc_dev *umc = card->devs[n]; |
135 | |
136 | if (umc != NULL) |
137 | umc_device_unregister(umc); |
138 | } |
139 | |
140 | static int whci_n_caps(struct pci_dev *pci) |
141 | { |
142 | void __iomem *uwbbase; |
143 | u64 capinfo; |
144 | |
145 | uwbbase = pci_iomap(pci, 0, 8); |
146 | if (!uwbbase) |
147 | return -ENOMEM; |
148 | capinfo = le_readq(uwbbase + UWBCAPINFO); |
149 | pci_iounmap(pci, uwbbase); |
150 | |
151 | return UWBCAPINFO_TO_N_CAPS(capinfo); |
152 | } |
153 | |
154 | static int whci_probe(struct pci_dev *pci, const struct pci_device_id *id) |
155 | { |
156 | struct whci_card *card; |
157 | int err, n_caps, n; |
158 | |
159 | err = pci_enable_device(pci); |
160 | if (err < 0) |
161 | goto error; |
162 | pci_enable_msi(pci); |
163 | pci_set_master(pci); |
164 | err = -ENXIO; |
165 | if (!pci_set_dma_mask(pci, DMA_BIT_MASK(64))) |
166 | pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64)); |
167 | else if (!pci_set_dma_mask(pci, DMA_BIT_MASK(32))) |
168 | pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)); |
169 | else |
170 | goto error_dma; |
171 | |
172 | err = n_caps = whci_n_caps(pci); |
173 | if (n_caps < 0) |
174 | goto error_ncaps; |
175 | |
176 | err = -ENOMEM; |
177 | card = kzalloc(sizeof(struct whci_card) |
178 | + sizeof(struct whci_dev *) * (n_caps + 1), |
179 | GFP_KERNEL); |
180 | if (card == NULL) |
181 | goto error_kzalloc; |
182 | card->pci = pci; |
183 | card->n_caps = n_caps; |
184 | |
185 | err = -EBUSY; |
186 | if (!request_mem_region(pci_resource_start(pci, 0), |
187 | UWBCAPDATA_SIZE(card->n_caps), |
188 | "whci (capability data)")) |
189 | goto error_request_memregion; |
190 | err = -ENOMEM; |
191 | card->uwbbase = pci_iomap(pci, 0, UWBCAPDATA_SIZE(card->n_caps)); |
192 | if (!card->uwbbase) |
193 | goto error_iomap; |
194 | |
195 | /* Add each capability. */ |
196 | for (n = 0; n <= card->n_caps; n++) { |
197 | err = whci_add_cap(card, n); |
198 | if (err < 0 && n == 0) { |
199 | dev_err(&pci->dev, "cannot bind UWB radio controller:" |
200 | " %d\n", err); |
201 | goto error_bind; |
202 | } |
203 | if (err < 0) |
204 | dev_warn(&pci->dev, "warning: cannot bind capability " |
205 | "#%u: %d\n", n, err); |
206 | } |
207 | pci_set_drvdata(pci, card); |
208 | return 0; |
209 | |
210 | error_bind: |
211 | pci_iounmap(pci, card->uwbbase); |
212 | error_iomap: |
213 | release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps)); |
214 | error_request_memregion: |
215 | kfree(card); |
216 | error_kzalloc: |
217 | error_ncaps: |
218 | error_dma: |
219 | pci_disable_msi(pci); |
220 | pci_disable_device(pci); |
221 | error: |
222 | return err; |
223 | } |
224 | |
225 | static void whci_remove(struct pci_dev *pci) |
226 | { |
227 | struct whci_card *card = pci_get_drvdata(pci); |
228 | int n; |
229 | |
230 | pci_set_drvdata(pci, NULL); |
231 | /* Unregister each capability in reverse (so the master device |
232 | * is unregistered last). */ |
233 | for (n = card->n_caps; n >= 0 ; n--) |
234 | whci_del_cap(card, n); |
235 | pci_iounmap(pci, card->uwbbase); |
236 | release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps)); |
237 | kfree(card); |
238 | pci_disable_msi(pci); |
239 | pci_disable_device(pci); |
240 | } |
241 | |
242 | static struct pci_device_id whci_id_table[] = { |
243 | { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) }, |
244 | { 0 }, |
245 | }; |
246 | MODULE_DEVICE_TABLE(pci, whci_id_table); |
247 | |
248 | |
249 | static struct pci_driver whci_driver = { |
250 | .name = "whci", |
251 | .id_table = whci_id_table, |
252 | .probe = whci_probe, |
253 | .remove = whci_remove, |
254 | }; |
255 | |
256 | static int __init whci_init(void) |
257 | { |
258 | return pci_register_driver(&whci_driver); |
259 | } |
260 | |
261 | static void __exit whci_exit(void) |
262 | { |
263 | pci_unregister_driver(&whci_driver); |
264 | } |
265 | |
266 | module_init(whci_init); |
267 | module_exit(whci_exit); |
268 | |
269 | MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator"); |
270 | MODULE_AUTHOR("Cambridge Silicon Radio Ltd."); |
271 | MODULE_LICENSE("GPL"); |
272 |
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