diff options
Diffstat (limited to 'drivers/usb/host/xhci-hcd.c')
-rw-r--r-- | drivers/usb/host/xhci-hcd.c | 1274 |
1 files changed, 1274 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c new file mode 100644 index 000000000000..dba3e07ccd09 --- /dev/null +++ b/drivers/usb/host/xhci-hcd.c | |||
@@ -0,0 +1,1274 @@ | |||
1 | /* | ||
2 | * xHCI host controller driver | ||
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/irq.h> | ||
24 | #include <linux/module.h> | ||
25 | |||
26 | #include "xhci.h" | ||
27 | |||
28 | #define DRIVER_AUTHOR "Sarah Sharp" | ||
29 | #define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver" | ||
30 | |||
31 | /* TODO: copied from ehci-hcd.c - can this be refactored? */ | ||
32 | /* | ||
33 | * handshake - spin reading hc until handshake completes or fails | ||
34 | * @ptr: address of hc register to be read | ||
35 | * @mask: bits to look at in result of read | ||
36 | * @done: value of those bits when handshake succeeds | ||
37 | * @usec: timeout in microseconds | ||
38 | * | ||
39 | * Returns negative errno, or zero on success | ||
40 | * | ||
41 | * Success happens when the "mask" bits have the specified value (hardware | ||
42 | * handshake done). There are two failure modes: "usec" have passed (major | ||
43 | * hardware flakeout), or the register reads as all-ones (hardware removed). | ||
44 | */ | ||
45 | static int handshake(struct xhci_hcd *xhci, void __iomem *ptr, | ||
46 | u32 mask, u32 done, int usec) | ||
47 | { | ||
48 | u32 result; | ||
49 | |||
50 | do { | ||
51 | result = xhci_readl(xhci, ptr); | ||
52 | if (result == ~(u32)0) /* card removed */ | ||
53 | return -ENODEV; | ||
54 | result &= mask; | ||
55 | if (result == done) | ||
56 | return 0; | ||
57 | udelay(1); | ||
58 | usec--; | ||
59 | } while (usec > 0); | ||
60 | return -ETIMEDOUT; | ||
61 | } | ||
62 | |||
63 | /* | ||
64 | * Force HC into halt state. | ||
65 | * | ||
66 | * Disable any IRQs and clear the run/stop bit. | ||
67 | * HC will complete any current and actively pipelined transactions, and | ||
68 | * should halt within 16 microframes of the run/stop bit being cleared. | ||
69 | * Read HC Halted bit in the status register to see when the HC is finished. | ||
70 | * XXX: shouldn't we set HC_STATE_HALT here somewhere? | ||
71 | */ | ||
72 | int xhci_halt(struct xhci_hcd *xhci) | ||
73 | { | ||
74 | u32 halted; | ||
75 | u32 cmd; | ||
76 | u32 mask; | ||
77 | |||
78 | xhci_dbg(xhci, "// Halt the HC\n"); | ||
79 | /* Disable all interrupts from the host controller */ | ||
80 | mask = ~(XHCI_IRQS); | ||
81 | halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT; | ||
82 | if (!halted) | ||
83 | mask &= ~CMD_RUN; | ||
84 | |||
85 | cmd = xhci_readl(xhci, &xhci->op_regs->command); | ||
86 | cmd &= mask; | ||
87 | xhci_writel(xhci, cmd, &xhci->op_regs->command); | ||
88 | |||
89 | return handshake(xhci, &xhci->op_regs->status, | ||
90 | STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC); | ||
91 | } | ||
92 | |||
93 | /* | ||
94 | * Reset a halted HC, and set the internal HC state to HC_STATE_HALT. | ||
95 | * | ||
96 | * This resets pipelines, timers, counters, state machines, etc. | ||
97 | * Transactions will be terminated immediately, and operational registers | ||
98 | * will be set to their defaults. | ||
99 | */ | ||
100 | int xhci_reset(struct xhci_hcd *xhci) | ||
101 | { | ||
102 | u32 command; | ||
103 | u32 state; | ||
104 | |||
105 | state = xhci_readl(xhci, &xhci->op_regs->status); | ||
106 | BUG_ON((state & STS_HALT) == 0); | ||
107 | |||
108 | xhci_dbg(xhci, "// Reset the HC\n"); | ||
109 | command = xhci_readl(xhci, &xhci->op_regs->command); | ||
110 | command |= CMD_RESET; | ||
111 | xhci_writel(xhci, command, &xhci->op_regs->command); | ||
112 | /* XXX: Why does EHCI set this here? Shouldn't other code do this? */ | ||
113 | xhci_to_hcd(xhci)->state = HC_STATE_HALT; | ||
114 | |||
115 | return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000); | ||
116 | } | ||
117 | |||
118 | /* | ||
119 | * Stop the HC from processing the endpoint queues. | ||
120 | */ | ||
121 | static void xhci_quiesce(struct xhci_hcd *xhci) | ||
122 | { | ||
123 | /* | ||
124 | * Queues are per endpoint, so we need to disable an endpoint or slot. | ||
125 | * | ||
126 | * To disable a slot, we need to insert a disable slot command on the | ||
127 | * command ring and ring the doorbell. This will also free any internal | ||
128 | * resources associated with the slot (which might not be what we want). | ||
129 | * | ||
130 | * A Release Endpoint command sounds better - doesn't free internal HC | ||
131 | * memory, but removes the endpoints from the schedule and releases the | ||
132 | * bandwidth, disables the doorbells, and clears the endpoint enable | ||
133 | * flag. Usually used prior to a set interface command. | ||
134 | * | ||
135 | * TODO: Implement after command ring code is done. | ||
136 | */ | ||
137 | BUG_ON(!HC_IS_RUNNING(xhci_to_hcd(xhci)->state)); | ||
138 | xhci_dbg(xhci, "Finished quiescing -- code not written yet\n"); | ||
139 | } | ||
140 | |||
141 | #if 0 | ||
142 | /* Set up MSI-X table for entry 0 (may claim other entries later) */ | ||
143 | static int xhci_setup_msix(struct xhci_hcd *xhci) | ||
144 | { | ||
145 | int ret; | ||
146 | struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); | ||
147 | |||
148 | xhci->msix_count = 0; | ||
149 | /* XXX: did I do this right? ixgbe does kcalloc for more than one */ | ||
150 | xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL); | ||
151 | if (!xhci->msix_entries) { | ||
152 | xhci_err(xhci, "Failed to allocate MSI-X entries\n"); | ||
153 | return -ENOMEM; | ||
154 | } | ||
155 | xhci->msix_entries[0].entry = 0; | ||
156 | |||
157 | ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count); | ||
158 | if (ret) { | ||
159 | xhci_err(xhci, "Failed to enable MSI-X\n"); | ||
160 | goto free_entries; | ||
161 | } | ||
162 | |||
163 | /* | ||
164 | * Pass the xhci pointer value as the request_irq "cookie". | ||
165 | * If more irqs are added, this will need to be unique for each one. | ||
166 | */ | ||
167 | ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0, | ||
168 | "xHCI", xhci_to_hcd(xhci)); | ||
169 | if (ret) { | ||
170 | xhci_err(xhci, "Failed to allocate MSI-X interrupt\n"); | ||
171 | goto disable_msix; | ||
172 | } | ||
173 | xhci_dbg(xhci, "Finished setting up MSI-X\n"); | ||
174 | return 0; | ||
175 | |||
176 | disable_msix: | ||
177 | pci_disable_msix(pdev); | ||
178 | free_entries: | ||
179 | kfree(xhci->msix_entries); | ||
180 | xhci->msix_entries = NULL; | ||
181 | return ret; | ||
182 | } | ||
183 | |||
184 | /* XXX: code duplication; can xhci_setup_msix call this? */ | ||
185 | /* Free any IRQs and disable MSI-X */ | ||
186 | static void xhci_cleanup_msix(struct xhci_hcd *xhci) | ||
187 | { | ||
188 | struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); | ||
189 | if (!xhci->msix_entries) | ||
190 | return; | ||
191 | |||
192 | free_irq(xhci->msix_entries[0].vector, xhci); | ||
193 | pci_disable_msix(pdev); | ||
194 | kfree(xhci->msix_entries); | ||
195 | xhci->msix_entries = NULL; | ||
196 | xhci_dbg(xhci, "Finished cleaning up MSI-X\n"); | ||
197 | } | ||
198 | #endif | ||
199 | |||
200 | /* | ||
201 | * Initialize memory for HCD and xHC (one-time init). | ||
202 | * | ||
203 | * Program the PAGESIZE register, initialize the device context array, create | ||
204 | * device contexts (?), set up a command ring segment (or two?), create event | ||
205 | * ring (one for now). | ||
206 | */ | ||
207 | int xhci_init(struct usb_hcd *hcd) | ||
208 | { | ||
209 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
210 | int retval = 0; | ||
211 | |||
212 | xhci_dbg(xhci, "xhci_init\n"); | ||
213 | spin_lock_init(&xhci->lock); | ||
214 | retval = xhci_mem_init(xhci, GFP_KERNEL); | ||
215 | xhci_dbg(xhci, "Finished xhci_init\n"); | ||
216 | |||
217 | return retval; | ||
218 | } | ||
219 | |||
220 | /* | ||
221 | * Called in interrupt context when there might be work | ||
222 | * queued on the event ring | ||
223 | * | ||
224 | * xhci->lock must be held by caller. | ||
225 | */ | ||
226 | static void xhci_work(struct xhci_hcd *xhci) | ||
227 | { | ||
228 | u32 temp; | ||
229 | |||
230 | /* | ||
231 | * Clear the op reg interrupt status first, | ||
232 | * so we can receive interrupts from other MSI-X interrupters. | ||
233 | * Write 1 to clear the interrupt status. | ||
234 | */ | ||
235 | temp = xhci_readl(xhci, &xhci->op_regs->status); | ||
236 | temp |= STS_EINT; | ||
237 | xhci_writel(xhci, temp, &xhci->op_regs->status); | ||
238 | /* FIXME when MSI-X is supported and there are multiple vectors */ | ||
239 | /* Clear the MSI-X event interrupt status */ | ||
240 | |||
241 | /* Acknowledge the interrupt */ | ||
242 | temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
243 | temp |= 0x3; | ||
244 | xhci_writel(xhci, temp, &xhci->ir_set->irq_pending); | ||
245 | /* Flush posted writes */ | ||
246 | xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
247 | |||
248 | /* FIXME this should be a delayed service routine that clears the EHB */ | ||
249 | xhci_handle_event(xhci); | ||
250 | |||
251 | /* Clear the event handler busy flag; the event ring should be empty. */ | ||
252 | temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]); | ||
253 | xhci_writel(xhci, temp & ~ERST_EHB, &xhci->ir_set->erst_dequeue[0]); | ||
254 | /* Flush posted writes -- FIXME is this necessary? */ | ||
255 | xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
256 | } | ||
257 | |||
258 | /*-------------------------------------------------------------------------*/ | ||
259 | |||
260 | /* | ||
261 | * xHCI spec says we can get an interrupt, and if the HC has an error condition, | ||
262 | * we might get bad data out of the event ring. Section 4.10.2.7 has a list of | ||
263 | * indicators of an event TRB error, but we check the status *first* to be safe. | ||
264 | */ | ||
265 | irqreturn_t xhci_irq(struct usb_hcd *hcd) | ||
266 | { | ||
267 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
268 | u32 temp, temp2; | ||
269 | |||
270 | spin_lock(&xhci->lock); | ||
271 | /* Check if the xHC generated the interrupt, or the irq is shared */ | ||
272 | temp = xhci_readl(xhci, &xhci->op_regs->status); | ||
273 | temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
274 | if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) { | ||
275 | spin_unlock(&xhci->lock); | ||
276 | return IRQ_NONE; | ||
277 | } | ||
278 | |||
279 | if (temp & STS_FATAL) { | ||
280 | xhci_warn(xhci, "WARNING: Host System Error\n"); | ||
281 | xhci_halt(xhci); | ||
282 | xhci_to_hcd(xhci)->state = HC_STATE_HALT; | ||
283 | spin_unlock(&xhci->lock); | ||
284 | return -ESHUTDOWN; | ||
285 | } | ||
286 | |||
287 | xhci_work(xhci); | ||
288 | spin_unlock(&xhci->lock); | ||
289 | |||
290 | return IRQ_HANDLED; | ||
291 | } | ||
292 | |||
293 | #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING | ||
294 | void xhci_event_ring_work(unsigned long arg) | ||
295 | { | ||
296 | unsigned long flags; | ||
297 | int temp; | ||
298 | struct xhci_hcd *xhci = (struct xhci_hcd *) arg; | ||
299 | int i, j; | ||
300 | |||
301 | xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies); | ||
302 | |||
303 | spin_lock_irqsave(&xhci->lock, flags); | ||
304 | temp = xhci_readl(xhci, &xhci->op_regs->status); | ||
305 | xhci_dbg(xhci, "op reg status = 0x%x\n", temp); | ||
306 | temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
307 | xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp); | ||
308 | xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled); | ||
309 | xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask); | ||
310 | xhci->error_bitmask = 0; | ||
311 | xhci_dbg(xhci, "Event ring:\n"); | ||
312 | xhci_debug_segment(xhci, xhci->event_ring->deq_seg); | ||
313 | xhci_dbg_ring_ptrs(xhci, xhci->event_ring); | ||
314 | temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]); | ||
315 | temp &= ERST_PTR_MASK; | ||
316 | xhci_dbg(xhci, "ERST deq = 0x%x\n", temp); | ||
317 | xhci_dbg(xhci, "Command ring:\n"); | ||
318 | xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg); | ||
319 | xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring); | ||
320 | xhci_dbg_cmd_ptrs(xhci); | ||
321 | for (i = 0; i < MAX_HC_SLOTS; ++i) { | ||
322 | if (xhci->devs[i]) { | ||
323 | for (j = 0; j < 31; ++j) { | ||
324 | if (xhci->devs[i]->ep_rings[j]) { | ||
325 | xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j); | ||
326 | xhci_debug_segment(xhci, xhci->devs[i]->ep_rings[j]->deq_seg); | ||
327 | } | ||
328 | } | ||
329 | } | ||
330 | } | ||
331 | |||
332 | if (xhci->noops_submitted != NUM_TEST_NOOPS) | ||
333 | if (xhci_setup_one_noop(xhci)) | ||
334 | xhci_ring_cmd_db(xhci); | ||
335 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
336 | |||
337 | if (!xhci->zombie) | ||
338 | mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ); | ||
339 | else | ||
340 | xhci_dbg(xhci, "Quit polling the event ring.\n"); | ||
341 | } | ||
342 | #endif | ||
343 | |||
344 | /* | ||
345 | * Start the HC after it was halted. | ||
346 | * | ||
347 | * This function is called by the USB core when the HC driver is added. | ||
348 | * Its opposite is xhci_stop(). | ||
349 | * | ||
350 | * xhci_init() must be called once before this function can be called. | ||
351 | * Reset the HC, enable device slot contexts, program DCBAAP, and | ||
352 | * set command ring pointer and event ring pointer. | ||
353 | * | ||
354 | * Setup MSI-X vectors and enable interrupts. | ||
355 | */ | ||
356 | int xhci_run(struct usb_hcd *hcd) | ||
357 | { | ||
358 | u32 temp; | ||
359 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
360 | void (*doorbell)(struct xhci_hcd *) = NULL; | ||
361 | |||
362 | hcd->uses_new_polling = 1; | ||
363 | hcd->poll_rh = 0; | ||
364 | |||
365 | xhci_dbg(xhci, "xhci_run\n"); | ||
366 | #if 0 /* FIXME: MSI not setup yet */ | ||
367 | /* Do this at the very last minute */ | ||
368 | ret = xhci_setup_msix(xhci); | ||
369 | if (!ret) | ||
370 | return ret; | ||
371 | |||
372 | return -ENOSYS; | ||
373 | #endif | ||
374 | #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING | ||
375 | init_timer(&xhci->event_ring_timer); | ||
376 | xhci->event_ring_timer.data = (unsigned long) xhci; | ||
377 | xhci->event_ring_timer.function = xhci_event_ring_work; | ||
378 | /* Poll the event ring */ | ||
379 | xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ; | ||
380 | xhci->zombie = 0; | ||
381 | xhci_dbg(xhci, "Setting event ring polling timer\n"); | ||
382 | add_timer(&xhci->event_ring_timer); | ||
383 | #endif | ||
384 | |||
385 | xhci_dbg(xhci, "// Set the interrupt modulation register\n"); | ||
386 | temp = xhci_readl(xhci, &xhci->ir_set->irq_control); | ||
387 | temp &= ~ER_IRQ_INTERVAL_MASK; | ||
388 | temp |= (u32) 160; | ||
389 | xhci_writel(xhci, temp, &xhci->ir_set->irq_control); | ||
390 | |||
391 | /* Set the HCD state before we enable the irqs */ | ||
392 | hcd->state = HC_STATE_RUNNING; | ||
393 | temp = xhci_readl(xhci, &xhci->op_regs->command); | ||
394 | temp |= (CMD_EIE); | ||
395 | xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n", | ||
396 | temp); | ||
397 | xhci_writel(xhci, temp, &xhci->op_regs->command); | ||
398 | |||
399 | temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
400 | xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n", | ||
401 | xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp)); | ||
402 | xhci_writel(xhci, ER_IRQ_ENABLE(temp), | ||
403 | &xhci->ir_set->irq_pending); | ||
404 | xhci_print_ir_set(xhci, xhci->ir_set, 0); | ||
405 | |||
406 | if (NUM_TEST_NOOPS > 0) | ||
407 | doorbell = xhci_setup_one_noop(xhci); | ||
408 | |||
409 | xhci_dbg(xhci, "Command ring memory map follows:\n"); | ||
410 | xhci_debug_ring(xhci, xhci->cmd_ring); | ||
411 | xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring); | ||
412 | xhci_dbg_cmd_ptrs(xhci); | ||
413 | |||
414 | xhci_dbg(xhci, "ERST memory map follows:\n"); | ||
415 | xhci_dbg_erst(xhci, &xhci->erst); | ||
416 | xhci_dbg(xhci, "Event ring:\n"); | ||
417 | xhci_debug_ring(xhci, xhci->event_ring); | ||
418 | xhci_dbg_ring_ptrs(xhci, xhci->event_ring); | ||
419 | temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]); | ||
420 | temp &= ERST_PTR_MASK; | ||
421 | xhci_dbg(xhci, "ERST deq = 0x%x\n", temp); | ||
422 | temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[1]); | ||
423 | xhci_dbg(xhci, "ERST deq upper = 0x%x\n", temp); | ||
424 | |||
425 | temp = xhci_readl(xhci, &xhci->op_regs->command); | ||
426 | temp |= (CMD_RUN); | ||
427 | xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n", | ||
428 | temp); | ||
429 | xhci_writel(xhci, temp, &xhci->op_regs->command); | ||
430 | /* Flush PCI posted writes */ | ||
431 | temp = xhci_readl(xhci, &xhci->op_regs->command); | ||
432 | xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp); | ||
433 | if (doorbell) | ||
434 | (*doorbell)(xhci); | ||
435 | |||
436 | xhci_dbg(xhci, "Finished xhci_run\n"); | ||
437 | return 0; | ||
438 | } | ||
439 | |||
440 | /* | ||
441 | * Stop xHCI driver. | ||
442 | * | ||
443 | * This function is called by the USB core when the HC driver is removed. | ||
444 | * Its opposite is xhci_run(). | ||
445 | * | ||
446 | * Disable device contexts, disable IRQs, and quiesce the HC. | ||
447 | * Reset the HC, finish any completed transactions, and cleanup memory. | ||
448 | */ | ||
449 | void xhci_stop(struct usb_hcd *hcd) | ||
450 | { | ||
451 | u32 temp; | ||
452 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
453 | |||
454 | spin_lock_irq(&xhci->lock); | ||
455 | if (HC_IS_RUNNING(hcd->state)) | ||
456 | xhci_quiesce(xhci); | ||
457 | xhci_halt(xhci); | ||
458 | xhci_reset(xhci); | ||
459 | spin_unlock_irq(&xhci->lock); | ||
460 | |||
461 | #if 0 /* No MSI yet */ | ||
462 | xhci_cleanup_msix(xhci); | ||
463 | #endif | ||
464 | #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING | ||
465 | /* Tell the event ring poll function not to reschedule */ | ||
466 | xhci->zombie = 1; | ||
467 | del_timer_sync(&xhci->event_ring_timer); | ||
468 | #endif | ||
469 | |||
470 | xhci_dbg(xhci, "// Disabling event ring interrupts\n"); | ||
471 | temp = xhci_readl(xhci, &xhci->op_regs->status); | ||
472 | xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status); | ||
473 | temp = xhci_readl(xhci, &xhci->ir_set->irq_pending); | ||
474 | xhci_writel(xhci, ER_IRQ_DISABLE(temp), | ||
475 | &xhci->ir_set->irq_pending); | ||
476 | xhci_print_ir_set(xhci, xhci->ir_set, 0); | ||
477 | |||
478 | xhci_dbg(xhci, "cleaning up memory\n"); | ||
479 | xhci_mem_cleanup(xhci); | ||
480 | xhci_dbg(xhci, "xhci_stop completed - status = %x\n", | ||
481 | xhci_readl(xhci, &xhci->op_regs->status)); | ||
482 | } | ||
483 | |||
484 | /* | ||
485 | * Shutdown HC (not bus-specific) | ||
486 | * | ||
487 | * This is called when the machine is rebooting or halting. We assume that the | ||
488 | * machine will be powered off, and the HC's internal state will be reset. | ||
489 | * Don't bother to free memory. | ||
490 | */ | ||
491 | void xhci_shutdown(struct usb_hcd *hcd) | ||
492 | { | ||
493 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
494 | |||
495 | spin_lock_irq(&xhci->lock); | ||
496 | xhci_halt(xhci); | ||
497 | spin_unlock_irq(&xhci->lock); | ||
498 | |||
499 | #if 0 | ||
500 | xhci_cleanup_msix(xhci); | ||
501 | #endif | ||
502 | |||
503 | xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n", | ||
504 | xhci_readl(xhci, &xhci->op_regs->status)); | ||
505 | } | ||
506 | |||
507 | /*-------------------------------------------------------------------------*/ | ||
508 | |||
509 | /** | ||
510 | * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and | ||
511 | * HCDs. Find the index for an endpoint given its descriptor. Use the return | ||
512 | * value to right shift 1 for the bitmask. | ||
513 | * | ||
514 | * Index = (epnum * 2) + direction - 1, | ||
515 | * where direction = 0 for OUT, 1 for IN. | ||
516 | * For control endpoints, the IN index is used (OUT index is unused), so | ||
517 | * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2) | ||
518 | */ | ||
519 | unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc) | ||
520 | { | ||
521 | unsigned int index; | ||
522 | if (usb_endpoint_xfer_control(desc)) | ||
523 | index = (unsigned int) (usb_endpoint_num(desc)*2); | ||
524 | else | ||
525 | index = (unsigned int) (usb_endpoint_num(desc)*2) + | ||
526 | (usb_endpoint_dir_in(desc) ? 1 : 0) - 1; | ||
527 | return index; | ||
528 | } | ||
529 | |||
530 | /* Find the flag for this endpoint (for use in the control context). Use the | ||
531 | * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is | ||
532 | * bit 1, etc. | ||
533 | */ | ||
534 | unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc) | ||
535 | { | ||
536 | return 1 << (xhci_get_endpoint_index(desc) + 1); | ||
537 | } | ||
538 | |||
539 | /* Compute the last valid endpoint context index. Basically, this is the | ||
540 | * endpoint index plus one. For slot contexts with more than valid endpoint, | ||
541 | * we find the most significant bit set in the added contexts flags. | ||
542 | * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000 | ||
543 | * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one. | ||
544 | */ | ||
545 | static inline unsigned int xhci_last_valid_endpoint(u32 added_ctxs) | ||
546 | { | ||
547 | return fls(added_ctxs) - 1; | ||
548 | } | ||
549 | |||
550 | /* Returns 1 if the arguments are OK; | ||
551 | * returns 0 this is a root hub; returns -EINVAL for NULL pointers. | ||
552 | */ | ||
553 | int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev, | ||
554 | struct usb_host_endpoint *ep, int check_ep, const char *func) { | ||
555 | if (!hcd || (check_ep && !ep) || !udev) { | ||
556 | printk(KERN_DEBUG "xHCI %s called with invalid args\n", | ||
557 | func); | ||
558 | return -EINVAL; | ||
559 | } | ||
560 | if (!udev->parent) { | ||
561 | printk(KERN_DEBUG "xHCI %s called for root hub\n", | ||
562 | func); | ||
563 | return 0; | ||
564 | } | ||
565 | if (!udev->slot_id) { | ||
566 | printk(KERN_DEBUG "xHCI %s called with unaddressed device\n", | ||
567 | func); | ||
568 | return -EINVAL; | ||
569 | } | ||
570 | return 1; | ||
571 | } | ||
572 | |||
573 | /* | ||
574 | * non-error returns are a promise to giveback() the urb later | ||
575 | * we drop ownership so next owner (or urb unlink) can get it | ||
576 | */ | ||
577 | int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) | ||
578 | { | ||
579 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
580 | unsigned long flags; | ||
581 | int ret = 0; | ||
582 | unsigned int slot_id, ep_index; | ||
583 | |||
584 | if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0) | ||
585 | return -EINVAL; | ||
586 | |||
587 | slot_id = urb->dev->slot_id; | ||
588 | ep_index = xhci_get_endpoint_index(&urb->ep->desc); | ||
589 | |||
590 | spin_lock_irqsave(&xhci->lock, flags); | ||
591 | if (!xhci->devs || !xhci->devs[slot_id]) { | ||
592 | if (!in_interrupt()) | ||
593 | dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n"); | ||
594 | ret = -EINVAL; | ||
595 | goto exit; | ||
596 | } | ||
597 | if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { | ||
598 | if (!in_interrupt()) | ||
599 | xhci_dbg(xhci, "urb submitted during PCI suspend\n"); | ||
600 | ret = -ESHUTDOWN; | ||
601 | goto exit; | ||
602 | } | ||
603 | if (usb_endpoint_xfer_control(&urb->ep->desc)) | ||
604 | ret = xhci_queue_ctrl_tx(xhci, mem_flags, urb, | ||
605 | slot_id, ep_index); | ||
606 | else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) | ||
607 | ret = xhci_queue_bulk_tx(xhci, mem_flags, urb, | ||
608 | slot_id, ep_index); | ||
609 | else | ||
610 | ret = -EINVAL; | ||
611 | exit: | ||
612 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
613 | return ret; | ||
614 | } | ||
615 | |||
616 | /* | ||
617 | * Remove the URB's TD from the endpoint ring. This may cause the HC to stop | ||
618 | * USB transfers, potentially stopping in the middle of a TRB buffer. The HC | ||
619 | * should pick up where it left off in the TD, unless a Set Transfer Ring | ||
620 | * Dequeue Pointer is issued. | ||
621 | * | ||
622 | * The TRBs that make up the buffers for the canceled URB will be "removed" from | ||
623 | * the ring. Since the ring is a contiguous structure, they can't be physically | ||
624 | * removed. Instead, there are two options: | ||
625 | * | ||
626 | * 1) If the HC is in the middle of processing the URB to be canceled, we | ||
627 | * simply move the ring's dequeue pointer past those TRBs using the Set | ||
628 | * Transfer Ring Dequeue Pointer command. This will be the common case, | ||
629 | * when drivers timeout on the last submitted URB and attempt to cancel. | ||
630 | * | ||
631 | * 2) If the HC is in the middle of a different TD, we turn the TRBs into a | ||
632 | * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The | ||
633 | * HC will need to invalidate the any TRBs it has cached after the stop | ||
634 | * endpoint command, as noted in the xHCI 0.95 errata. | ||
635 | * | ||
636 | * 3) The TD may have completed by the time the Stop Endpoint Command | ||
637 | * completes, so software needs to handle that case too. | ||
638 | * | ||
639 | * This function should protect against the TD enqueueing code ringing the | ||
640 | * doorbell while this code is waiting for a Stop Endpoint command to complete. | ||
641 | * It also needs to account for multiple cancellations on happening at the same | ||
642 | * time for the same endpoint. | ||
643 | * | ||
644 | * Note that this function can be called in any context, or so says | ||
645 | * usb_hcd_unlink_urb() | ||
646 | */ | ||
647 | int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) | ||
648 | { | ||
649 | unsigned long flags; | ||
650 | int ret; | ||
651 | struct xhci_hcd *xhci; | ||
652 | struct xhci_td *td; | ||
653 | unsigned int ep_index; | ||
654 | struct xhci_ring *ep_ring; | ||
655 | |||
656 | xhci = hcd_to_xhci(hcd); | ||
657 | spin_lock_irqsave(&xhci->lock, flags); | ||
658 | /* Make sure the URB hasn't completed or been unlinked already */ | ||
659 | ret = usb_hcd_check_unlink_urb(hcd, urb, status); | ||
660 | if (ret || !urb->hcpriv) | ||
661 | goto done; | ||
662 | |||
663 | xhci_dbg(xhci, "Cancel URB %p\n", urb); | ||
664 | ep_index = xhci_get_endpoint_index(&urb->ep->desc); | ||
665 | ep_ring = xhci->devs[urb->dev->slot_id]->ep_rings[ep_index]; | ||
666 | td = (struct xhci_td *) urb->hcpriv; | ||
667 | |||
668 | ep_ring->cancels_pending++; | ||
669 | list_add_tail(&td->cancelled_td_list, &ep_ring->cancelled_td_list); | ||
670 | /* Queue a stop endpoint command, but only if this is | ||
671 | * the first cancellation to be handled. | ||
672 | */ | ||
673 | if (ep_ring->cancels_pending == 1) { | ||
674 | xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index); | ||
675 | xhci_ring_cmd_db(xhci); | ||
676 | } | ||
677 | done: | ||
678 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
679 | return ret; | ||
680 | } | ||
681 | |||
682 | /* Drop an endpoint from a new bandwidth configuration for this device. | ||
683 | * Only one call to this function is allowed per endpoint before | ||
684 | * check_bandwidth() or reset_bandwidth() must be called. | ||
685 | * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will | ||
686 | * add the endpoint to the schedule with possibly new parameters denoted by a | ||
687 | * different endpoint descriptor in usb_host_endpoint. | ||
688 | * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is | ||
689 | * not allowed. | ||
690 | * | ||
691 | * The USB core will not allow URBs to be queued to an endpoint that is being | ||
692 | * disabled, so there's no need for mutual exclusion to protect | ||
693 | * the xhci->devs[slot_id] structure. | ||
694 | */ | ||
695 | int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev, | ||
696 | struct usb_host_endpoint *ep) | ||
697 | { | ||
698 | struct xhci_hcd *xhci; | ||
699 | struct xhci_device_control *in_ctx; | ||
700 | unsigned int last_ctx; | ||
701 | unsigned int ep_index; | ||
702 | struct xhci_ep_ctx *ep_ctx; | ||
703 | u32 drop_flag; | ||
704 | u32 new_add_flags, new_drop_flags, new_slot_info; | ||
705 | int ret; | ||
706 | |||
707 | ret = xhci_check_args(hcd, udev, ep, 1, __func__); | ||
708 | if (ret <= 0) | ||
709 | return ret; | ||
710 | xhci = hcd_to_xhci(hcd); | ||
711 | xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); | ||
712 | |||
713 | drop_flag = xhci_get_endpoint_flag(&ep->desc); | ||
714 | if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) { | ||
715 | xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n", | ||
716 | __func__, drop_flag); | ||
717 | return 0; | ||
718 | } | ||
719 | |||
720 | if (!xhci->devs || !xhci->devs[udev->slot_id]) { | ||
721 | xhci_warn(xhci, "xHCI %s called with unaddressed device\n", | ||
722 | __func__); | ||
723 | return -EINVAL; | ||
724 | } | ||
725 | |||
726 | in_ctx = xhci->devs[udev->slot_id]->in_ctx; | ||
727 | ep_index = xhci_get_endpoint_index(&ep->desc); | ||
728 | ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[ep_index]; | ||
729 | /* If the HC already knows the endpoint is disabled, | ||
730 | * or the HCD has noted it is disabled, ignore this request | ||
731 | */ | ||
732 | if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED || | ||
733 | in_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) { | ||
734 | xhci_warn(xhci, "xHCI %s called with disabled ep %p\n", | ||
735 | __func__, ep); | ||
736 | return 0; | ||
737 | } | ||
738 | |||
739 | in_ctx->drop_flags |= drop_flag; | ||
740 | new_drop_flags = in_ctx->drop_flags; | ||
741 | |||
742 | in_ctx->add_flags = ~drop_flag; | ||
743 | new_add_flags = in_ctx->add_flags; | ||
744 | |||
745 | last_ctx = xhci_last_valid_endpoint(in_ctx->add_flags); | ||
746 | /* Update the last valid endpoint context, if we deleted the last one */ | ||
747 | if ((in_ctx->slot.dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) { | ||
748 | in_ctx->slot.dev_info &= ~LAST_CTX_MASK; | ||
749 | in_ctx->slot.dev_info |= LAST_CTX(last_ctx); | ||
750 | } | ||
751 | new_slot_info = in_ctx->slot.dev_info; | ||
752 | |||
753 | xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep); | ||
754 | |||
755 | xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n", | ||
756 | (unsigned int) ep->desc.bEndpointAddress, | ||
757 | udev->slot_id, | ||
758 | (unsigned int) new_drop_flags, | ||
759 | (unsigned int) new_add_flags, | ||
760 | (unsigned int) new_slot_info); | ||
761 | return 0; | ||
762 | } | ||
763 | |||
764 | /* Add an endpoint to a new possible bandwidth configuration for this device. | ||
765 | * Only one call to this function is allowed per endpoint before | ||
766 | * check_bandwidth() or reset_bandwidth() must be called. | ||
767 | * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will | ||
768 | * add the endpoint to the schedule with possibly new parameters denoted by a | ||
769 | * different endpoint descriptor in usb_host_endpoint. | ||
770 | * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is | ||
771 | * not allowed. | ||
772 | * | ||
773 | * The USB core will not allow URBs to be queued to an endpoint until the | ||
774 | * configuration or alt setting is installed in the device, so there's no need | ||
775 | * for mutual exclusion to protect the xhci->devs[slot_id] structure. | ||
776 | */ | ||
777 | int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev, | ||
778 | struct usb_host_endpoint *ep) | ||
779 | { | ||
780 | struct xhci_hcd *xhci; | ||
781 | struct xhci_device_control *in_ctx; | ||
782 | unsigned int ep_index; | ||
783 | struct xhci_ep_ctx *ep_ctx; | ||
784 | u32 added_ctxs; | ||
785 | unsigned int last_ctx; | ||
786 | u32 new_add_flags, new_drop_flags, new_slot_info; | ||
787 | int ret = 0; | ||
788 | |||
789 | ret = xhci_check_args(hcd, udev, ep, 1, __func__); | ||
790 | if (ret <= 0) | ||
791 | return ret; | ||
792 | xhci = hcd_to_xhci(hcd); | ||
793 | |||
794 | added_ctxs = xhci_get_endpoint_flag(&ep->desc); | ||
795 | last_ctx = xhci_last_valid_endpoint(added_ctxs); | ||
796 | if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) { | ||
797 | /* FIXME when we have to issue an evaluate endpoint command to | ||
798 | * deal with ep0 max packet size changing once we get the | ||
799 | * descriptors | ||
800 | */ | ||
801 | xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n", | ||
802 | __func__, added_ctxs); | ||
803 | return 0; | ||
804 | } | ||
805 | |||
806 | if (!xhci->devs || !xhci->devs[udev->slot_id]) { | ||
807 | xhci_warn(xhci, "xHCI %s called with unaddressed device\n", | ||
808 | __func__); | ||
809 | return -EINVAL; | ||
810 | } | ||
811 | |||
812 | in_ctx = xhci->devs[udev->slot_id]->in_ctx; | ||
813 | ep_index = xhci_get_endpoint_index(&ep->desc); | ||
814 | ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[ep_index]; | ||
815 | /* If the HCD has already noted the endpoint is enabled, | ||
816 | * ignore this request. | ||
817 | */ | ||
818 | if (in_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) { | ||
819 | xhci_warn(xhci, "xHCI %s called with enabled ep %p\n", | ||
820 | __func__, ep); | ||
821 | return 0; | ||
822 | } | ||
823 | |||
824 | /* | ||
825 | * Configuration and alternate setting changes must be done in | ||
826 | * process context, not interrupt context (or so documenation | ||
827 | * for usb_set_interface() and usb_set_configuration() claim). | ||
828 | */ | ||
829 | if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id], | ||
830 | udev, ep, GFP_KERNEL) < 0) { | ||
831 | dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n", | ||
832 | __func__, ep->desc.bEndpointAddress); | ||
833 | return -ENOMEM; | ||
834 | } | ||
835 | |||
836 | in_ctx->add_flags |= added_ctxs; | ||
837 | new_add_flags = in_ctx->add_flags; | ||
838 | |||
839 | /* If xhci_endpoint_disable() was called for this endpoint, but the | ||
840 | * xHC hasn't been notified yet through the check_bandwidth() call, | ||
841 | * this re-adds a new state for the endpoint from the new endpoint | ||
842 | * descriptors. We must drop and re-add this endpoint, so we leave the | ||
843 | * drop flags alone. | ||
844 | */ | ||
845 | new_drop_flags = in_ctx->drop_flags; | ||
846 | |||
847 | /* Update the last valid endpoint context, if we just added one past */ | ||
848 | if ((in_ctx->slot.dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) { | ||
849 | in_ctx->slot.dev_info &= ~LAST_CTX_MASK; | ||
850 | in_ctx->slot.dev_info |= LAST_CTX(last_ctx); | ||
851 | } | ||
852 | new_slot_info = in_ctx->slot.dev_info; | ||
853 | |||
854 | xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n", | ||
855 | (unsigned int) ep->desc.bEndpointAddress, | ||
856 | udev->slot_id, | ||
857 | (unsigned int) new_drop_flags, | ||
858 | (unsigned int) new_add_flags, | ||
859 | (unsigned int) new_slot_info); | ||
860 | return 0; | ||
861 | } | ||
862 | |||
863 | static void xhci_zero_in_ctx(struct xhci_virt_device *virt_dev) | ||
864 | { | ||
865 | struct xhci_ep_ctx *ep_ctx; | ||
866 | int i; | ||
867 | |||
868 | /* When a device's add flag and drop flag are zero, any subsequent | ||
869 | * configure endpoint command will leave that endpoint's state | ||
870 | * untouched. Make sure we don't leave any old state in the input | ||
871 | * endpoint contexts. | ||
872 | */ | ||
873 | virt_dev->in_ctx->drop_flags = 0; | ||
874 | virt_dev->in_ctx->add_flags = 0; | ||
875 | virt_dev->in_ctx->slot.dev_info &= ~LAST_CTX_MASK; | ||
876 | /* Endpoint 0 is always valid */ | ||
877 | virt_dev->in_ctx->slot.dev_info |= LAST_CTX(1); | ||
878 | for (i = 1; i < 31; ++i) { | ||
879 | ep_ctx = &virt_dev->in_ctx->ep[i]; | ||
880 | ep_ctx->ep_info = 0; | ||
881 | ep_ctx->ep_info2 = 0; | ||
882 | ep_ctx->deq[0] = 0; | ||
883 | ep_ctx->deq[1] = 0; | ||
884 | ep_ctx->tx_info = 0; | ||
885 | } | ||
886 | } | ||
887 | |||
888 | /* Called after one or more calls to xhci_add_endpoint() or | ||
889 | * xhci_drop_endpoint(). If this call fails, the USB core is expected | ||
890 | * to call xhci_reset_bandwidth(). | ||
891 | * | ||
892 | * Since we are in the middle of changing either configuration or | ||
893 | * installing a new alt setting, the USB core won't allow URBs to be | ||
894 | * enqueued for any endpoint on the old config or interface. Nothing | ||
895 | * else should be touching the xhci->devs[slot_id] structure, so we | ||
896 | * don't need to take the xhci->lock for manipulating that. | ||
897 | */ | ||
898 | int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev) | ||
899 | { | ||
900 | int i; | ||
901 | int ret = 0; | ||
902 | int timeleft; | ||
903 | unsigned long flags; | ||
904 | struct xhci_hcd *xhci; | ||
905 | struct xhci_virt_device *virt_dev; | ||
906 | |||
907 | ret = xhci_check_args(hcd, udev, NULL, 0, __func__); | ||
908 | if (ret <= 0) | ||
909 | return ret; | ||
910 | xhci = hcd_to_xhci(hcd); | ||
911 | |||
912 | if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) { | ||
913 | xhci_warn(xhci, "xHCI %s called with unaddressed device\n", | ||
914 | __func__); | ||
915 | return -EINVAL; | ||
916 | } | ||
917 | xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); | ||
918 | virt_dev = xhci->devs[udev->slot_id]; | ||
919 | |||
920 | /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */ | ||
921 | virt_dev->in_ctx->add_flags |= SLOT_FLAG; | ||
922 | virt_dev->in_ctx->add_flags &= ~EP0_FLAG; | ||
923 | virt_dev->in_ctx->drop_flags &= ~SLOT_FLAG; | ||
924 | virt_dev->in_ctx->drop_flags &= ~EP0_FLAG; | ||
925 | xhci_dbg(xhci, "New Input Control Context:\n"); | ||
926 | xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma, | ||
927 | LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.dev_info)); | ||
928 | |||
929 | spin_lock_irqsave(&xhci->lock, flags); | ||
930 | ret = xhci_queue_configure_endpoint(xhci, virt_dev->in_ctx_dma, | ||
931 | udev->slot_id); | ||
932 | if (ret < 0) { | ||
933 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
934 | xhci_dbg(xhci, "FIXME allocate a new ring segment\n"); | ||
935 | return -ENOMEM; | ||
936 | } | ||
937 | xhci_ring_cmd_db(xhci); | ||
938 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
939 | |||
940 | /* Wait for the configure endpoint command to complete */ | ||
941 | timeleft = wait_for_completion_interruptible_timeout( | ||
942 | &virt_dev->cmd_completion, | ||
943 | USB_CTRL_SET_TIMEOUT); | ||
944 | if (timeleft <= 0) { | ||
945 | xhci_warn(xhci, "%s while waiting for configure endpoint command\n", | ||
946 | timeleft == 0 ? "Timeout" : "Signal"); | ||
947 | /* FIXME cancel the configure endpoint command */ | ||
948 | return -ETIME; | ||
949 | } | ||
950 | |||
951 | switch (virt_dev->cmd_status) { | ||
952 | case COMP_ENOMEM: | ||
953 | dev_warn(&udev->dev, "Not enough host controller resources " | ||
954 | "for new device state.\n"); | ||
955 | ret = -ENOMEM; | ||
956 | /* FIXME: can we allocate more resources for the HC? */ | ||
957 | break; | ||
958 | case COMP_BW_ERR: | ||
959 | dev_warn(&udev->dev, "Not enough bandwidth " | ||
960 | "for new device state.\n"); | ||
961 | ret = -ENOSPC; | ||
962 | /* FIXME: can we go back to the old state? */ | ||
963 | break; | ||
964 | case COMP_TRB_ERR: | ||
965 | /* the HCD set up something wrong */ | ||
966 | dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, add flag = 1, " | ||
967 | "and endpoint is not disabled.\n"); | ||
968 | ret = -EINVAL; | ||
969 | break; | ||
970 | case COMP_SUCCESS: | ||
971 | dev_dbg(&udev->dev, "Successful Endpoint Configure command\n"); | ||
972 | break; | ||
973 | default: | ||
974 | xhci_err(xhci, "ERROR: unexpected command completion " | ||
975 | "code 0x%x.\n", virt_dev->cmd_status); | ||
976 | ret = -EINVAL; | ||
977 | break; | ||
978 | } | ||
979 | if (ret) { | ||
980 | /* Callee should call reset_bandwidth() */ | ||
981 | return ret; | ||
982 | } | ||
983 | |||
984 | xhci_dbg(xhci, "Output context after successful config ep cmd:\n"); | ||
985 | xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma, | ||
986 | LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.dev_info)); | ||
987 | |||
988 | xhci_zero_in_ctx(virt_dev); | ||
989 | /* Free any old rings */ | ||
990 | for (i = 1; i < 31; ++i) { | ||
991 | if (virt_dev->new_ep_rings[i]) { | ||
992 | xhci_ring_free(xhci, virt_dev->ep_rings[i]); | ||
993 | virt_dev->ep_rings[i] = virt_dev->new_ep_rings[i]; | ||
994 | virt_dev->new_ep_rings[i] = NULL; | ||
995 | } | ||
996 | } | ||
997 | |||
998 | return ret; | ||
999 | } | ||
1000 | |||
1001 | void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev) | ||
1002 | { | ||
1003 | struct xhci_hcd *xhci; | ||
1004 | struct xhci_virt_device *virt_dev; | ||
1005 | int i, ret; | ||
1006 | |||
1007 | ret = xhci_check_args(hcd, udev, NULL, 0, __func__); | ||
1008 | if (ret <= 0) | ||
1009 | return; | ||
1010 | xhci = hcd_to_xhci(hcd); | ||
1011 | |||
1012 | if (!xhci->devs || !xhci->devs[udev->slot_id]) { | ||
1013 | xhci_warn(xhci, "xHCI %s called with unaddressed device\n", | ||
1014 | __func__); | ||
1015 | return; | ||
1016 | } | ||
1017 | xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev); | ||
1018 | virt_dev = xhci->devs[udev->slot_id]; | ||
1019 | /* Free any rings allocated for added endpoints */ | ||
1020 | for (i = 0; i < 31; ++i) { | ||
1021 | if (virt_dev->new_ep_rings[i]) { | ||
1022 | xhci_ring_free(xhci, virt_dev->new_ep_rings[i]); | ||
1023 | virt_dev->new_ep_rings[i] = NULL; | ||
1024 | } | ||
1025 | } | ||
1026 | xhci_zero_in_ctx(virt_dev); | ||
1027 | } | ||
1028 | |||
1029 | /* | ||
1030 | * At this point, the struct usb_device is about to go away, the device has | ||
1031 | * disconnected, and all traffic has been stopped and the endpoints have been | ||
1032 | * disabled. Free any HC data structures associated with that device. | ||
1033 | */ | ||
1034 | void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev) | ||
1035 | { | ||
1036 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
1037 | unsigned long flags; | ||
1038 | |||
1039 | if (udev->slot_id == 0) | ||
1040 | return; | ||
1041 | |||
1042 | spin_lock_irqsave(&xhci->lock, flags); | ||
1043 | if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) { | ||
1044 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1045 | xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); | ||
1046 | return; | ||
1047 | } | ||
1048 | xhci_ring_cmd_db(xhci); | ||
1049 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1050 | /* | ||
1051 | * Event command completion handler will free any data structures | ||
1052 | * associated with the slot. XXX Can free sleep? | ||
1053 | */ | ||
1054 | } | ||
1055 | |||
1056 | /* | ||
1057 | * Returns 0 if the xHC ran out of device slots, the Enable Slot command | ||
1058 | * timed out, or allocating memory failed. Returns 1 on success. | ||
1059 | */ | ||
1060 | int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev) | ||
1061 | { | ||
1062 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
1063 | unsigned long flags; | ||
1064 | int timeleft; | ||
1065 | int ret; | ||
1066 | |||
1067 | spin_lock_irqsave(&xhci->lock, flags); | ||
1068 | ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0); | ||
1069 | if (ret) { | ||
1070 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1071 | xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); | ||
1072 | return 0; | ||
1073 | } | ||
1074 | xhci_ring_cmd_db(xhci); | ||
1075 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1076 | |||
1077 | /* XXX: how much time for xHC slot assignment? */ | ||
1078 | timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev, | ||
1079 | USB_CTRL_SET_TIMEOUT); | ||
1080 | if (timeleft <= 0) { | ||
1081 | xhci_warn(xhci, "%s while waiting for a slot\n", | ||
1082 | timeleft == 0 ? "Timeout" : "Signal"); | ||
1083 | /* FIXME cancel the enable slot request */ | ||
1084 | return 0; | ||
1085 | } | ||
1086 | |||
1087 | if (!xhci->slot_id) { | ||
1088 | xhci_err(xhci, "Error while assigning device slot ID\n"); | ||
1089 | return 0; | ||
1090 | } | ||
1091 | /* xhci_alloc_virt_device() does not touch rings; no need to lock */ | ||
1092 | if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) { | ||
1093 | /* Disable slot, if we can do it without mem alloc */ | ||
1094 | xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n"); | ||
1095 | spin_lock_irqsave(&xhci->lock, flags); | ||
1096 | if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) | ||
1097 | xhci_ring_cmd_db(xhci); | ||
1098 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1099 | return 0; | ||
1100 | } | ||
1101 | udev->slot_id = xhci->slot_id; | ||
1102 | /* Is this a LS or FS device under a HS hub? */ | ||
1103 | /* Hub or peripherial? */ | ||
1104 | return 1; | ||
1105 | } | ||
1106 | |||
1107 | /* | ||
1108 | * Issue an Address Device command (which will issue a SetAddress request to | ||
1109 | * the device). | ||
1110 | * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so | ||
1111 | * we should only issue and wait on one address command at the same time. | ||
1112 | * | ||
1113 | * We add one to the device address issued by the hardware because the USB core | ||
1114 | * uses address 1 for the root hubs (even though they're not really devices). | ||
1115 | */ | ||
1116 | int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev) | ||
1117 | { | ||
1118 | unsigned long flags; | ||
1119 | int timeleft; | ||
1120 | struct xhci_virt_device *virt_dev; | ||
1121 | int ret = 0; | ||
1122 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
1123 | u32 temp; | ||
1124 | |||
1125 | if (!udev->slot_id) { | ||
1126 | xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id); | ||
1127 | return -EINVAL; | ||
1128 | } | ||
1129 | |||
1130 | virt_dev = xhci->devs[udev->slot_id]; | ||
1131 | |||
1132 | /* If this is a Set Address to an unconfigured device, setup ep 0 */ | ||
1133 | if (!udev->config) | ||
1134 | xhci_setup_addressable_virt_dev(xhci, udev); | ||
1135 | /* Otherwise, assume the core has the device configured how it wants */ | ||
1136 | |||
1137 | spin_lock_irqsave(&xhci->lock, flags); | ||
1138 | ret = xhci_queue_address_device(xhci, virt_dev->in_ctx_dma, | ||
1139 | udev->slot_id); | ||
1140 | if (ret) { | ||
1141 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1142 | xhci_dbg(xhci, "FIXME: allocate a command ring segment\n"); | ||
1143 | return ret; | ||
1144 | } | ||
1145 | xhci_ring_cmd_db(xhci); | ||
1146 | spin_unlock_irqrestore(&xhci->lock, flags); | ||
1147 | |||
1148 | /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */ | ||
1149 | timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev, | ||
1150 | USB_CTRL_SET_TIMEOUT); | ||
1151 | /* FIXME: From section 4.3.4: "Software shall be responsible for timing | ||
1152 | * the SetAddress() "recovery interval" required by USB and aborting the | ||
1153 | * command on a timeout. | ||
1154 | */ | ||
1155 | if (timeleft <= 0) { | ||
1156 | xhci_warn(xhci, "%s while waiting for a slot\n", | ||
1157 | timeleft == 0 ? "Timeout" : "Signal"); | ||
1158 | /* FIXME cancel the address device command */ | ||
1159 | return -ETIME; | ||
1160 | } | ||
1161 | |||
1162 | switch (virt_dev->cmd_status) { | ||
1163 | case COMP_CTX_STATE: | ||
1164 | case COMP_EBADSLT: | ||
1165 | xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n", | ||
1166 | udev->slot_id); | ||
1167 | ret = -EINVAL; | ||
1168 | break; | ||
1169 | case COMP_TX_ERR: | ||
1170 | dev_warn(&udev->dev, "Device not responding to set address.\n"); | ||
1171 | ret = -EPROTO; | ||
1172 | break; | ||
1173 | case COMP_SUCCESS: | ||
1174 | xhci_dbg(xhci, "Successful Address Device command\n"); | ||
1175 | break; | ||
1176 | default: | ||
1177 | xhci_err(xhci, "ERROR: unexpected command completion " | ||
1178 | "code 0x%x.\n", virt_dev->cmd_status); | ||
1179 | ret = -EINVAL; | ||
1180 | break; | ||
1181 | } | ||
1182 | if (ret) { | ||
1183 | return ret; | ||
1184 | } | ||
1185 | temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[0]); | ||
1186 | xhci_dbg(xhci, "Op regs DCBAA ptr[0] = %#08x\n", temp); | ||
1187 | temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[1]); | ||
1188 | xhci_dbg(xhci, "Op regs DCBAA ptr[1] = %#08x\n", temp); | ||
1189 | xhci_dbg(xhci, "Slot ID %d dcbaa entry[0] @%p = %#08x\n", | ||
1190 | udev->slot_id, | ||
1191 | &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id], | ||
1192 | xhci->dcbaa->dev_context_ptrs[2*udev->slot_id]); | ||
1193 | xhci_dbg(xhci, "Slot ID %d dcbaa entry[1] @%p = %#08x\n", | ||
1194 | udev->slot_id, | ||
1195 | &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1], | ||
1196 | xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1]); | ||
1197 | xhci_dbg(xhci, "Output Context DMA address = %#08llx\n", | ||
1198 | (unsigned long long)virt_dev->out_ctx_dma); | ||
1199 | xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id); | ||
1200 | xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma, 2); | ||
1201 | xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id); | ||
1202 | xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma, 2); | ||
1203 | /* | ||
1204 | * USB core uses address 1 for the roothubs, so we add one to the | ||
1205 | * address given back to us by the HC. | ||
1206 | */ | ||
1207 | udev->devnum = (virt_dev->out_ctx->slot.dev_state & DEV_ADDR_MASK) + 1; | ||
1208 | /* Zero the input context control for later use */ | ||
1209 | virt_dev->in_ctx->add_flags = 0; | ||
1210 | virt_dev->in_ctx->drop_flags = 0; | ||
1211 | /* Mirror flags in the output context for future ep enable/disable */ | ||
1212 | virt_dev->out_ctx->add_flags = SLOT_FLAG | EP0_FLAG; | ||
1213 | virt_dev->out_ctx->drop_flags = 0; | ||
1214 | |||
1215 | xhci_dbg(xhci, "Device address = %d\n", udev->devnum); | ||
1216 | /* XXX Meh, not sure if anyone else but choose_address uses this. */ | ||
1217 | set_bit(udev->devnum, udev->bus->devmap.devicemap); | ||
1218 | |||
1219 | return 0; | ||
1220 | } | ||
1221 | |||
1222 | int xhci_get_frame(struct usb_hcd *hcd) | ||
1223 | { | ||
1224 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | ||
1225 | /* EHCI mods by the periodic size. Why? */ | ||
1226 | return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3; | ||
1227 | } | ||
1228 | |||
1229 | MODULE_DESCRIPTION(DRIVER_DESC); | ||
1230 | MODULE_AUTHOR(DRIVER_AUTHOR); | ||
1231 | MODULE_LICENSE("GPL"); | ||
1232 | |||
1233 | static int __init xhci_hcd_init(void) | ||
1234 | { | ||
1235 | #ifdef CONFIG_PCI | ||
1236 | int retval = 0; | ||
1237 | |||
1238 | retval = xhci_register_pci(); | ||
1239 | |||
1240 | if (retval < 0) { | ||
1241 | printk(KERN_DEBUG "Problem registering PCI driver."); | ||
1242 | return retval; | ||
1243 | } | ||
1244 | #endif | ||
1245 | /* | ||
1246 | * Check the compiler generated sizes of structures that must be laid | ||
1247 | * out in specific ways for hardware access. | ||
1248 | */ | ||
1249 | BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8); | ||
1250 | BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8); | ||
1251 | BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8); | ||
1252 | /* xhci_device_control has eight fields, and also | ||
1253 | * embeds one xhci_slot_ctx and 31 xhci_ep_ctx | ||
1254 | */ | ||
1255 | BUILD_BUG_ON(sizeof(struct xhci_device_control) != (8+8+8*31)*32/8); | ||
1256 | BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8); | ||
1257 | BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8); | ||
1258 | BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8); | ||
1259 | BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8); | ||
1260 | BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8); | ||
1261 | /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */ | ||
1262 | BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8); | ||
1263 | BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8); | ||
1264 | return 0; | ||
1265 | } | ||
1266 | module_init(xhci_hcd_init); | ||
1267 | |||
1268 | static void __exit xhci_hcd_cleanup(void) | ||
1269 | { | ||
1270 | #ifdef CONFIG_PCI | ||
1271 | xhci_unregister_pci(); | ||
1272 | #endif | ||
1273 | } | ||
1274 | module_exit(xhci_hcd_cleanup); | ||