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