xref: /openbmc/linux/drivers/usb/host/ehci-pci.c (revision 1f7d5520)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * EHCI HCD (Host Controller Driver) PCI Bus Glue.
4  *
5  * Copyright (c) 2000-2004 by David Brownell
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/usb.h>
12 #include <linux/usb/hcd.h>
13 
14 #include "ehci.h"
15 #include "pci-quirks.h"
16 
17 #define DRIVER_DESC "EHCI PCI platform driver"
18 
19 static const char hcd_name[] = "ehci-pci";
20 
21 /* defined here to avoid adding to pci_ids.h for single instance use */
22 #define PCI_DEVICE_ID_INTEL_CE4100_USB	0x2e70
23 
24 #define PCI_VENDOR_ID_ASPEED		0x1a03
25 #define PCI_DEVICE_ID_ASPEED_EHCI	0x2603
26 
27 /*-------------------------------------------------------------------------*/
28 #define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC		0x0939
is_intel_quark_x1000(struct pci_dev * pdev)29 static inline bool is_intel_quark_x1000(struct pci_dev *pdev)
30 {
31 	return pdev->vendor == PCI_VENDOR_ID_INTEL &&
32 		pdev->device == PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC;
33 }
34 
35 /*
36  * This is the list of PCI IDs for the devices that have EHCI USB class and
37  * specific drivers for that. One of the example is a ChipIdea device installed
38  * on some Intel MID platforms.
39  */
40 static const struct pci_device_id bypass_pci_id_table[] = {
41 	/* ChipIdea on Intel MID platform */
42 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0811), },
43 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0829), },
44 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xe006), },
45 	{}
46 };
47 
is_bypassed_id(struct pci_dev * pdev)48 static inline bool is_bypassed_id(struct pci_dev *pdev)
49 {
50 	return !!pci_match_id(bypass_pci_id_table, pdev);
51 }
52 
53 /*
54  * 0x84 is the offset of in/out threshold register,
55  * and it is the same offset as the register of 'hostpc'.
56  */
57 #define	intel_quark_x1000_insnreg01	hostpc
58 
59 /* Maximum usable threshold value is 0x7f dwords for both IN and OUT */
60 #define INTEL_QUARK_X1000_EHCI_MAX_THRESHOLD	0x007f007f
61 
62 /* called after powerup, by probe or system-pm "wakeup" */
ehci_pci_reinit(struct ehci_hcd * ehci,struct pci_dev * pdev)63 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
64 {
65 	int			retval;
66 
67 	/* we expect static quirk code to handle the "extended capabilities"
68 	 * (currently just BIOS handoff) allowed starting with EHCI 0.96
69 	 */
70 
71 	/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
72 	retval = pci_set_mwi(pdev);
73 	if (!retval)
74 		ehci_dbg(ehci, "MWI active\n");
75 
76 	/* Reset the threshold limit */
77 	if (is_intel_quark_x1000(pdev)) {
78 		/*
79 		 * For the Intel QUARK X1000, raise the I/O threshold to the
80 		 * maximum usable value in order to improve performance.
81 		 */
82 		ehci_writel(ehci, INTEL_QUARK_X1000_EHCI_MAX_THRESHOLD,
83 			ehci->regs->intel_quark_x1000_insnreg01);
84 	}
85 
86 	return 0;
87 }
88 
89 /* called during probe() after chip reset completes */
ehci_pci_setup(struct usb_hcd * hcd)90 static int ehci_pci_setup(struct usb_hcd *hcd)
91 {
92 	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
93 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
94 	u32			temp;
95 	int			retval;
96 
97 	ehci->caps = hcd->regs;
98 
99 	/*
100 	 * ehci_init() causes memory for DMA transfers to be
101 	 * allocated.  Thus, any vendor-specific workarounds based on
102 	 * limiting the type of memory used for DMA transfers must
103 	 * happen before ehci_setup() is called.
104 	 *
105 	 * Most other workarounds can be done either before or after
106 	 * init and reset; they are located here too.
107 	 */
108 	switch (pdev->vendor) {
109 	case PCI_VENDOR_ID_TOSHIBA_2:
110 		/* celleb's companion chip */
111 		if (pdev->device == 0x01b5) {
112 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
113 			ehci->big_endian_mmio = 1;
114 #else
115 			ehci_warn(ehci,
116 				  "unsupported big endian Toshiba quirk\n");
117 #endif
118 		}
119 		break;
120 	case PCI_VENDOR_ID_NVIDIA:
121 		/* NVidia reports that certain chips don't handle
122 		 * QH, ITD, or SITD addresses above 2GB.  (But TD,
123 		 * data buffer, and periodic schedule are normal.)
124 		 */
125 		switch (pdev->device) {
126 		case 0x003c:	/* MCP04 */
127 		case 0x005b:	/* CK804 */
128 		case 0x00d8:	/* CK8 */
129 		case 0x00e8:	/* CK8S */
130 			if (dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(31)) < 0)
131 				ehci_warn(ehci, "can't enable NVidia "
132 					"workaround for >2GB RAM\n");
133 			break;
134 
135 		/* Some NForce2 chips have problems with selective suspend;
136 		 * fixed in newer silicon.
137 		 */
138 		case 0x0068:
139 			if (pdev->revision < 0xa4)
140 				ehci->no_selective_suspend = 1;
141 			break;
142 		}
143 		break;
144 	case PCI_VENDOR_ID_INTEL:
145 		if (pdev->device == PCI_DEVICE_ID_INTEL_CE4100_USB)
146 			hcd->has_tt = 1;
147 		break;
148 	case PCI_VENDOR_ID_TDI:
149 		if (pdev->device == PCI_DEVICE_ID_TDI_EHCI)
150 			hcd->has_tt = 1;
151 		break;
152 	case PCI_VENDOR_ID_AMD:
153 		/* AMD PLL quirk */
154 		if (usb_amd_quirk_pll_check())
155 			ehci->amd_pll_fix = 1;
156 		/* AMD8111 EHCI doesn't work, according to AMD errata */
157 		if (pdev->device == 0x7463) {
158 			ehci_info(ehci, "ignoring AMD8111 (errata)\n");
159 			retval = -EIO;
160 			goto done;
161 		}
162 
163 		/*
164 		 * EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
165 		 * read/write memory space which does not belong to it when
166 		 * there is NULL pointer with T-bit set to 1 in the frame list
167 		 * table. To avoid the issue, the frame list link pointer
168 		 * should always contain a valid pointer to a inactive qh.
169 		 */
170 		if (pdev->device == 0x7808) {
171 			ehci->use_dummy_qh = 1;
172 			ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
173 		}
174 		break;
175 	case PCI_VENDOR_ID_VIA:
176 		if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
177 			u8 tmp;
178 
179 			/* The VT6212 defaults to a 1 usec EHCI sleep time which
180 			 * hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
181 			 * that sleep time use the conventional 10 usec.
182 			 */
183 			pci_read_config_byte(pdev, 0x4b, &tmp);
184 			if (tmp & 0x20)
185 				break;
186 			pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
187 		}
188 		break;
189 	case PCI_VENDOR_ID_ATI:
190 		/* AMD PLL quirk */
191 		if (usb_amd_quirk_pll_check())
192 			ehci->amd_pll_fix = 1;
193 
194 		/*
195 		 * EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
196 		 * read/write memory space which does not belong to it when
197 		 * there is NULL pointer with T-bit set to 1 in the frame list
198 		 * table. To avoid the issue, the frame list link pointer
199 		 * should always contain a valid pointer to a inactive qh.
200 		 */
201 		if (pdev->device == 0x4396) {
202 			ehci->use_dummy_qh = 1;
203 			ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
204 		}
205 		/* SB600 and old version of SB700 have a bug in EHCI controller,
206 		 * which causes usb devices lose response in some cases.
207 		 */
208 		if ((pdev->device == 0x4386 || pdev->device == 0x4396) &&
209 				usb_amd_hang_symptom_quirk()) {
210 			u8 tmp;
211 			ehci_info(ehci, "applying AMD SB600/SB700 USB freeze workaround\n");
212 			pci_read_config_byte(pdev, 0x53, &tmp);
213 			pci_write_config_byte(pdev, 0x53, tmp | (1<<3));
214 		}
215 		break;
216 	case PCI_VENDOR_ID_NETMOS:
217 		/* MosChip frame-index-register bug */
218 		ehci_info(ehci, "applying MosChip frame-index workaround\n");
219 		ehci->frame_index_bug = 1;
220 		break;
221 	case PCI_VENDOR_ID_HUAWEI:
222 		/* Synopsys HC bug */
223 		if (pdev->device == 0xa239) {
224 			ehci_info(ehci, "applying Synopsys HC workaround\n");
225 			ehci->has_synopsys_hc_bug = 1;
226 		}
227 		break;
228 	case PCI_VENDOR_ID_ASPEED:
229 		if (pdev->device == PCI_DEVICE_ID_ASPEED_EHCI) {
230 			ehci_info(ehci, "applying Aspeed HC workaround\n");
231 			ehci->is_aspeed = 1;
232 		}
233 		break;
234 	case PCI_VENDOR_ID_ZHAOXIN:
235 		if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x90)
236 			ehci->zx_wakeup_clear_needed = 1;
237 		break;
238 	}
239 
240 	/* optional debug port, normally in the first BAR */
241 	temp = pci_find_capability(pdev, PCI_CAP_ID_DBG);
242 	if (temp) {
243 		pci_read_config_dword(pdev, temp, &temp);
244 		temp >>= 16;
245 		if (((temp >> 13) & 7) == 1) {
246 			u32 hcs_params = ehci_readl(ehci,
247 						    &ehci->caps->hcs_params);
248 
249 			temp &= 0x1fff;
250 			ehci->debug = hcd->regs + temp;
251 			temp = ehci_readl(ehci, &ehci->debug->control);
252 			ehci_info(ehci, "debug port %d%s\n",
253 				  HCS_DEBUG_PORT(hcs_params),
254 				  (temp & DBGP_ENABLED) ? " IN USE" : "");
255 			if (!(temp & DBGP_ENABLED))
256 				ehci->debug = NULL;
257 		}
258 	}
259 
260 	retval = ehci_setup(hcd);
261 	if (retval)
262 		return retval;
263 
264 	/* These workarounds need to be applied after ehci_setup() */
265 	switch (pdev->vendor) {
266 	case PCI_VENDOR_ID_NEC:
267 	case PCI_VENDOR_ID_INTEL:
268 	case PCI_VENDOR_ID_AMD:
269 		ehci->need_io_watchdog = 0;
270 		break;
271 	case PCI_VENDOR_ID_NVIDIA:
272 		switch (pdev->device) {
273 		/* MCP89 chips on the MacBookAir3,1 give EPROTO when
274 		 * fetching device descriptors unless LPM is disabled.
275 		 * There are also intermittent problems enumerating
276 		 * devices with PPCD enabled.
277 		 */
278 		case 0x0d9d:
279 			ehci_info(ehci, "disable ppcd for nvidia mcp89\n");
280 			ehci->has_ppcd = 0;
281 			ehci->command &= ~CMD_PPCEE;
282 			break;
283 		}
284 		break;
285 	}
286 
287 	/* at least the Genesys GL880S needs fixup here */
288 	temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
289 	temp &= 0x0f;
290 	if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
291 		ehci_dbg(ehci, "bogus port configuration: "
292 			"cc=%d x pcc=%d < ports=%d\n",
293 			HCS_N_CC(ehci->hcs_params),
294 			HCS_N_PCC(ehci->hcs_params),
295 			HCS_N_PORTS(ehci->hcs_params));
296 
297 		switch (pdev->vendor) {
298 		case 0x17a0:		/* GENESYS */
299 			/* GL880S: should be PORTS=2 */
300 			temp |= (ehci->hcs_params & ~0xf);
301 			ehci->hcs_params = temp;
302 			break;
303 		case PCI_VENDOR_ID_NVIDIA:
304 			/* NF4: should be PCC=10 */
305 			break;
306 		}
307 	}
308 
309 	/* Serial Bus Release Number is at PCI 0x60 offset */
310 	if (pdev->vendor == PCI_VENDOR_ID_STMICRO
311 	    && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
312 		;	/* ConneXT has no sbrn register */
313 	else if (pdev->vendor == PCI_VENDOR_ID_HUAWEI
314 			 && pdev->device == 0xa239)
315 		;	/* HUAWEI Kunpeng920 USB EHCI has no sbrn register */
316 	else
317 		pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
318 
319 	/* Keep this around for a while just in case some EHCI
320 	 * implementation uses legacy PCI PM support.  This test
321 	 * can be removed on 17 Dec 2009 if the dev_warn() hasn't
322 	 * been triggered by then.
323 	 */
324 	if (!device_can_wakeup(&pdev->dev)) {
325 		u16	port_wake;
326 
327 		pci_read_config_word(pdev, 0x62, &port_wake);
328 		if (port_wake & 0x0001) {
329 			dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
330 			device_set_wakeup_capable(&pdev->dev, 1);
331 		}
332 	}
333 
334 #ifdef	CONFIG_PM
335 	if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
336 		ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
337 #endif
338 
339 	retval = ehci_pci_reinit(ehci, pdev);
340 done:
341 	return retval;
342 }
343 
344 /*-------------------------------------------------------------------------*/
345 
346 #ifdef	CONFIG_PM
347 
348 /* suspend/resume, section 4.3 */
349 
350 /* These routines rely on the PCI bus glue
351  * to handle powerdown and wakeup, and currently also on
352  * transceivers that don't need any software attention to set up
353  * the right sort of wakeup.
354  * Also they depend on separate root hub suspend/resume.
355  */
356 
ehci_pci_resume(struct usb_hcd * hcd,pm_message_t msg)357 static int ehci_pci_resume(struct usb_hcd *hcd, pm_message_t msg)
358 {
359 	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
360 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
361 	bool			hibernated = (msg.event == PM_EVENT_RESTORE);
362 
363 	if (ehci_resume(hcd, hibernated) != 0)
364 		(void) ehci_pci_reinit(ehci, pdev);
365 	return 0;
366 }
367 
368 #else
369 
370 #define ehci_suspend		NULL
371 #define ehci_pci_resume		NULL
372 #endif	/* CONFIG_PM */
373 
374 static struct hc_driver __read_mostly ehci_pci_hc_driver;
375 
376 static const struct ehci_driver_overrides pci_overrides __initconst = {
377 	.reset =		ehci_pci_setup,
378 };
379 
380 /*-------------------------------------------------------------------------*/
381 
ehci_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)382 static int ehci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
383 {
384 	if (is_bypassed_id(pdev))
385 		return -ENODEV;
386 	return usb_hcd_pci_probe(pdev, &ehci_pci_hc_driver);
387 }
388 
ehci_pci_remove(struct pci_dev * pdev)389 static void ehci_pci_remove(struct pci_dev *pdev)
390 {
391 	pci_clear_mwi(pdev);
392 	usb_hcd_pci_remove(pdev);
393 }
394 
395 /* PCI driver selection metadata; PCI hotplugging uses this */
396 static const struct pci_device_id pci_ids [] = { {
397 	/* handle any USB 2.0 EHCI controller */
398 	PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
399 	}, {
400 	PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST),
401 	},
402 	{ /* end: all zeroes */ }
403 };
404 MODULE_DEVICE_TABLE(pci, pci_ids);
405 
406 /* pci driver glue; this is a "new style" PCI driver module */
407 static struct pci_driver ehci_pci_driver = {
408 	.name =		hcd_name,
409 	.id_table =	pci_ids,
410 
411 	.probe =	ehci_pci_probe,
412 	.remove =	ehci_pci_remove,
413 	.shutdown = 	usb_hcd_pci_shutdown,
414 
415 	.driver =	{
416 #ifdef CONFIG_PM
417 		.pm =	&usb_hcd_pci_pm_ops,
418 #endif
419 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
420 	},
421 };
422 
ehci_pci_init(void)423 static int __init ehci_pci_init(void)
424 {
425 	if (usb_disabled())
426 		return -ENODEV;
427 
428 	ehci_init_driver(&ehci_pci_hc_driver, &pci_overrides);
429 
430 	/* Entries for the PCI suspend/resume callbacks are special */
431 	ehci_pci_hc_driver.pci_suspend = ehci_suspend;
432 	ehci_pci_hc_driver.pci_resume = ehci_pci_resume;
433 
434 	return pci_register_driver(&ehci_pci_driver);
435 }
436 module_init(ehci_pci_init);
437 
ehci_pci_cleanup(void)438 static void __exit ehci_pci_cleanup(void)
439 {
440 	pci_unregister_driver(&ehci_pci_driver);
441 }
442 module_exit(ehci_pci_cleanup);
443 
444 MODULE_DESCRIPTION(DRIVER_DESC);
445 MODULE_AUTHOR("David Brownell");
446 MODULE_AUTHOR("Alan Stern");
447 MODULE_LICENSE("GPL");
448