usb/xhci: refactor xhci_pci_setup()
[pandora-kernel.git] / drivers / usb / host / xhci-pci.c
1 /*
2  * xHCI host controller driver PCI Bus Glue.
3  *
4  * Copyright (C) 2008 Intel Corp.
5  *
6  * Author: Sarah Sharp
7  * Some code borrowed from the Linux EHCI driver.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16  * for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software Foundation,
20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 #include <linux/pci.h>
24 #include <linux/slab.h>
25
26 #include "xhci.h"
27
28 /* Device for a quirk */
29 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
30 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
31
32 #define PCI_VENDOR_ID_ETRON             0x1b6f
33 #define PCI_DEVICE_ID_ASROCK_P67        0x7023
34
35 static const char hcd_name[] = "xhci_hcd";
36
37 /* called after powerup, by probe or system-pm "wakeup" */
38 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
39 {
40         /*
41          * TODO: Implement finding debug ports later.
42          * TODO: see if there are any quirks that need to be added to handle
43          * new extended capabilities.
44          */
45
46         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
47         if (!pci_set_mwi(pdev))
48                 xhci_dbg(xhci, "MWI active\n");
49
50         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
51         return 0;
52 }
53
54 typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
55
56 static int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
57 {
58         struct xhci_hcd         *xhci;
59         struct device           *dev = hcd->self.controller;
60         int                     retval;
61         u32                     temp;
62
63         hcd->self.sg_tablesize = TRBS_PER_SEGMENT - 2;
64
65         if (usb_hcd_is_primary_hcd(hcd)) {
66                 xhci = kzalloc(sizeof(struct xhci_hcd), GFP_KERNEL);
67                 if (!xhci)
68                         return -ENOMEM;
69                 *((struct xhci_hcd **) hcd->hcd_priv) = xhci;
70                 xhci->main_hcd = hcd;
71                 /* Mark the first roothub as being USB 2.0.
72                  * The xHCI driver will register the USB 3.0 roothub.
73                  */
74                 hcd->speed = HCD_USB2;
75                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
76                 /*
77                  * USB 2.0 roothub under xHCI has an integrated TT,
78                  * (rate matching hub) as opposed to having an OHCI/UHCI
79                  * companion controller.
80                  */
81                 hcd->has_tt = 1;
82         } else {
83                 /* xHCI private pointer was set in xhci_pci_probe for the second
84                  * registered roothub.
85                  */
86                 xhci = hcd_to_xhci(hcd);
87                 temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
88                 if (HCC_64BIT_ADDR(temp)) {
89                         xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
90                         dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
91                 } else {
92                         dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
93                 }
94                 return 0;
95         }
96
97         xhci->cap_regs = hcd->regs;
98         xhci->op_regs = hcd->regs +
99                 HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
100         xhci->run_regs = hcd->regs +
101                 (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
102         /* Cache read-only capability registers */
103         xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
104         xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
105         xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
106         xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
107         xhci->hci_version = HC_VERSION(xhci->hcc_params);
108         xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
109         xhci_print_registers(xhci);
110
111         get_quirks(dev, xhci);
112
113         /* Make sure the HC is halted. */
114         retval = xhci_halt(xhci);
115         if (retval)
116                 goto error;
117
118         xhci_dbg(xhci, "Resetting HCD\n");
119         /* Reset the internal HC memory state and registers. */
120         retval = xhci_reset(xhci);
121         if (retval)
122                 goto error;
123         xhci_dbg(xhci, "Reset complete\n");
124
125         temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
126         if (HCC_64BIT_ADDR(temp)) {
127                 xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
128                 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
129         } else {
130                 dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
131         }
132
133         xhci_dbg(xhci, "Calling HCD init\n");
134         /* Initialize HCD and host controller data structures. */
135         retval = xhci_init(hcd);
136         if (retval)
137                 goto error;
138         xhci_dbg(xhci, "Called HCD init\n");
139         return 0;
140 error:
141         kfree(xhci);
142         return retval;
143 }
144
145 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
146 {
147         struct pci_dev          *pdev = to_pci_dev(dev);
148
149         /* Look for vendor-specific quirks */
150         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
151                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK) {
152                 if (pdev->revision == 0x0) {
153                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
154                         xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
155                                         " endpoint cmd after reset endpoint\n");
156                 }
157                 /* Fresco Logic confirms: all revisions of this chip do not
158                  * support MSI, even though some of them claim to in their PCI
159                  * capabilities.
160                  */
161                 xhci->quirks |= XHCI_BROKEN_MSI;
162                 xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u "
163                                 "has broken MSI implementation\n",
164                                 pdev->revision);
165         }
166
167         if (pdev->vendor == PCI_VENDOR_ID_NEC)
168                 xhci->quirks |= XHCI_NEC_HOST;
169
170         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
171                 xhci->quirks |= XHCI_AMD_0x96_HOST;
172
173         /* AMD PLL quirk */
174         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
175                 xhci->quirks |= XHCI_AMD_PLL_FIX;
176         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
177                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
178                 xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
179                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
180                 xhci->limit_active_eps = 64;
181                 xhci->quirks |= XHCI_SW_BW_CHECKING;
182         }
183         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
184                         pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
185                 xhci->quirks |= XHCI_RESET_ON_RESUME;
186                 xhci_dbg(xhci, "QUIRK: Resetting on resume\n");
187         }
188 }
189
190 /* called during probe() after chip reset completes */
191 static int xhci_pci_setup(struct usb_hcd *hcd)
192 {
193         struct xhci_hcd         *xhci;
194         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
195         int                     retval;
196
197         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
198         if (retval)
199                 return retval;
200
201         xhci = hcd_to_xhci(hcd);
202         if (!usb_hcd_is_primary_hcd(hcd))
203                 return 0;
204
205         pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
206         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
207
208         /* Find any debug ports */
209         retval = xhci_pci_reinit(xhci, pdev);
210         if (!retval)
211                 return retval;
212
213         kfree(xhci);
214         return retval;
215 }
216
217 /*
218  * We need to register our own PCI probe function (instead of the USB core's
219  * function) in order to create a second roothub under xHCI.
220  */
221 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
222 {
223         int retval;
224         struct xhci_hcd *xhci;
225         struct hc_driver *driver;
226         struct usb_hcd *hcd;
227
228         driver = (struct hc_driver *)id->driver_data;
229         /* Register the USB 2.0 roothub.
230          * FIXME: USB core must know to register the USB 2.0 roothub first.
231          * This is sort of silly, because we could just set the HCD driver flags
232          * to say USB 2.0, but I'm not sure what the implications would be in
233          * the other parts of the HCD code.
234          */
235         retval = usb_hcd_pci_probe(dev, id);
236
237         if (retval)
238                 return retval;
239
240         /* USB 2.0 roothub is stored in the PCI device now. */
241         hcd = dev_get_drvdata(&dev->dev);
242         xhci = hcd_to_xhci(hcd);
243         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
244                                 pci_name(dev), hcd);
245         if (!xhci->shared_hcd) {
246                 retval = -ENOMEM;
247                 goto dealloc_usb2_hcd;
248         }
249
250         /* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
251          * is called by usb_add_hcd().
252          */
253         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
254
255         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
256                         IRQF_SHARED);
257         if (retval)
258                 goto put_usb3_hcd;
259         /* Roothub already marked as USB 3.0 speed */
260         return 0;
261
262 put_usb3_hcd:
263         usb_put_hcd(xhci->shared_hcd);
264 dealloc_usb2_hcd:
265         usb_hcd_pci_remove(dev);
266         return retval;
267 }
268
269 static void xhci_pci_remove(struct pci_dev *dev)
270 {
271         struct xhci_hcd *xhci;
272
273         xhci = hcd_to_xhci(pci_get_drvdata(dev));
274         if (xhci->shared_hcd) {
275                 usb_remove_hcd(xhci->shared_hcd);
276                 usb_put_hcd(xhci->shared_hcd);
277         }
278         usb_hcd_pci_remove(dev);
279         kfree(xhci);
280 }
281
282 #ifdef CONFIG_PM
283 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
284 {
285         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
286         int     retval = 0;
287
288         if (hcd->state != HC_STATE_SUSPENDED ||
289                         xhci->shared_hcd->state != HC_STATE_SUSPENDED)
290                 return -EINVAL;
291
292         retval = xhci_suspend(xhci);
293
294         return retval;
295 }
296
297 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
298 {
299         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
300         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
301         int                     retval = 0;
302
303         /* The BIOS on systems with the Intel Panther Point chipset may or may
304          * not support xHCI natively.  That means that during system resume, it
305          * may switch the ports back to EHCI so that users can use their
306          * keyboard to select a kernel from GRUB after resume from hibernate.
307          *
308          * The BIOS is supposed to remember whether the OS had xHCI ports
309          * enabled before resume, and switch the ports back to xHCI when the
310          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
311          * writers.
312          *
313          * Unconditionally switch the ports back to xHCI after a system resume.
314          * We can't tell whether the EHCI or xHCI controller will be resumed
315          * first, so we have to do the port switchover in both drivers.  Writing
316          * a '1' to the port switchover registers should have no effect if the
317          * port was already switched over.
318          */
319         if (usb_is_intel_switchable_xhci(pdev))
320                 usb_enable_xhci_ports(pdev);
321
322         retval = xhci_resume(xhci, hibernated);
323         return retval;
324 }
325 #endif /* CONFIG_PM */
326
327 static const struct hc_driver xhci_pci_hc_driver = {
328         .description =          hcd_name,
329         .product_desc =         "xHCI Host Controller",
330         .hcd_priv_size =        sizeof(struct xhci_hcd *),
331
332         /*
333          * generic hardware linkage
334          */
335         .irq =                  xhci_irq,
336         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
337
338         /*
339          * basic lifecycle operations
340          */
341         .reset =                xhci_pci_setup,
342         .start =                xhci_run,
343 #ifdef CONFIG_PM
344         .pci_suspend =          xhci_pci_suspend,
345         .pci_resume =           xhci_pci_resume,
346 #endif
347         .stop =                 xhci_stop,
348         .shutdown =             xhci_shutdown,
349
350         /*
351          * managing i/o requests and associated device resources
352          */
353         .urb_enqueue =          xhci_urb_enqueue,
354         .urb_dequeue =          xhci_urb_dequeue,
355         .alloc_dev =            xhci_alloc_dev,
356         .free_dev =             xhci_free_dev,
357         .alloc_streams =        xhci_alloc_streams,
358         .free_streams =         xhci_free_streams,
359         .add_endpoint =         xhci_add_endpoint,
360         .drop_endpoint =        xhci_drop_endpoint,
361         .endpoint_reset =       xhci_endpoint_reset,
362         .check_bandwidth =      xhci_check_bandwidth,
363         .reset_bandwidth =      xhci_reset_bandwidth,
364         .address_device =       xhci_address_device,
365         .update_hub_device =    xhci_update_hub_device,
366         .reset_device =         xhci_discover_or_reset_device,
367
368         /*
369          * scheduling support
370          */
371         .get_frame_number =     xhci_get_frame,
372
373         /* Root hub support */
374         .hub_control =          xhci_hub_control,
375         .hub_status_data =      xhci_hub_status_data,
376         .bus_suspend =          xhci_bus_suspend,
377         .bus_resume =           xhci_bus_resume,
378         /*
379          * call back when device connected and addressed
380          */
381         .update_device =        xhci_update_device,
382         .set_usb2_hw_lpm =      xhci_set_usb2_hardware_lpm,
383 };
384
385 /*-------------------------------------------------------------------------*/
386
387 /* PCI driver selection metadata; PCI hotplugging uses this */
388 static const struct pci_device_id pci_ids[] = { {
389         /* handle any USB 3.0 xHCI controller */
390         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
391         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
392         },
393         { /* end: all zeroes */ }
394 };
395 MODULE_DEVICE_TABLE(pci, pci_ids);
396
397 /* pci driver glue; this is a "new style" PCI driver module */
398 static struct pci_driver xhci_pci_driver = {
399         .name =         (char *) hcd_name,
400         .id_table =     pci_ids,
401
402         .probe =        xhci_pci_probe,
403         .remove =       xhci_pci_remove,
404         /* suspend and resume implemented later */
405
406         .shutdown =     usb_hcd_pci_shutdown,
407 #ifdef CONFIG_PM_SLEEP
408         .driver = {
409                 .pm = &usb_hcd_pci_pm_ops
410         },
411 #endif
412 };
413
414 int xhci_register_pci(void)
415 {
416         return pci_register_driver(&xhci_pci_driver);
417 }
418
419 void xhci_unregister_pci(void)
420 {
421         pci_unregister_driver(&xhci_pci_driver);
422 }