Root/drivers/uwb/whci.c

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
17struct 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 :( */
26static
27u64 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 */
63int 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}
81EXPORT_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 */
92static 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
127error:
128    kfree(umc);
129    return err;
130}
131
132static 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
140static 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
154static 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
210error_bind:
211    pci_iounmap(pci, card->uwbbase);
212error_iomap:
213    release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
214error_request_memregion:
215    kfree(card);
216error_kzalloc:
217error_ncaps:
218error_dma:
219    pci_disable_msi(pci);
220    pci_disable_device(pci);
221error:
222    return err;
223}
224
225static 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
242static struct pci_device_id whci_id_table[] = {
243    { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
244    { 0 },
245};
246MODULE_DEVICE_TABLE(pci, whci_id_table);
247
248
249static struct pci_driver whci_driver = {
250    .name = "whci",
251    .id_table = whci_id_table,
252    .probe = whci_probe,
253    .remove = whci_remove,
254};
255
256static int __init whci_init(void)
257{
258    return pci_register_driver(&whci_driver);
259}
260
261static void __exit whci_exit(void)
262{
263    pci_unregister_driver(&whci_driver);
264}
265
266module_init(whci_init);
267module_exit(whci_exit);
268
269MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator");
270MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
271MODULE_LICENSE("GPL");
272

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