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