1 // SPDX-License-Identifier: GPL-2.0+
3 * EHCI HCD (Host Controller Driver) PCI Bus Glue.
5 * Copyright (c) 2000-2004 by David Brownell
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>
15 #include "pci-quirks.h"
17 #define DRIVER_DESC "EHCI PCI platform driver"
19 static const char hcd_name[] = "ehci-pci";
21 /* defined here to avoid adding to pci_ids.h for single instance use */
22 #define PCI_DEVICE_ID_INTEL_CE4100_USB 0x2e70
24 /*-------------------------------------------------------------------------*/
25 #define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC 0x0939
26 static inline bool is_intel_quark_x1000(struct pci_dev *pdev)
28 return pdev->vendor == PCI_VENDOR_ID_INTEL &&
29 pdev->device == PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC;
33 * This is the list of PCI IDs for the devices that have EHCI USB class and
34 * specific drivers for that. One of the example is a ChipIdea device installed
35 * on some Intel MID platforms.
37 static const struct pci_device_id bypass_pci_id_table[] = {
38 /* ChipIdea on Intel MID platform */
39 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0811), },
40 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0829), },
41 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xe006), },
45 static inline bool is_bypassed_id(struct pci_dev *pdev)
47 return !!pci_match_id(bypass_pci_id_table, pdev);
51 * 0x84 is the offset of in/out threshold register,
52 * and it is the same offset as the register of 'hostpc'.
54 #define intel_quark_x1000_insnreg01 hostpc
56 /* Maximum usable threshold value is 0x7f dwords for both IN and OUT */
57 #define INTEL_QUARK_X1000_EHCI_MAX_THRESHOLD 0x007f007f
59 /* called after powerup, by probe or system-pm "wakeup" */
60 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
64 /* we expect static quirk code to handle the "extended capabilities"
65 * (currently just BIOS handoff) allowed starting with EHCI 0.96
68 /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
69 retval = pci_set_mwi(pdev);
71 ehci_dbg(ehci, "MWI active\n");
73 /* Reset the threshold limit */
74 if (is_intel_quark_x1000(pdev)) {
76 * For the Intel QUARK X1000, raise the I/O threshold to the
77 * maximum usable value in order to improve performance.
79 ehci_writel(ehci, INTEL_QUARK_X1000_EHCI_MAX_THRESHOLD,
80 ehci->regs->intel_quark_x1000_insnreg01);
86 /* called during probe() after chip reset completes */
87 static int ehci_pci_setup(struct usb_hcd *hcd)
89 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
90 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
94 ehci->caps = hcd->regs;
97 * ehci_init() causes memory for DMA transfers to be
98 * allocated. Thus, any vendor-specific workarounds based on
99 * limiting the type of memory used for DMA transfers must
100 * happen before ehci_setup() is called.
102 * Most other workarounds can be done either before or after
103 * init and reset; they are located here too.
105 switch (pdev->vendor) {
106 case PCI_VENDOR_ID_TOSHIBA_2:
107 /* celleb's companion chip */
108 if (pdev->device == 0x01b5) {
109 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
110 ehci->big_endian_mmio = 1;
113 "unsupported big endian Toshiba quirk\n");
117 case PCI_VENDOR_ID_NVIDIA:
118 /* NVidia reports that certain chips don't handle
119 * QH, ITD, or SITD addresses above 2GB. (But TD,
120 * data buffer, and periodic schedule are normal.)
122 switch (pdev->device) {
123 case 0x003c: /* MCP04 */
124 case 0x005b: /* CK804 */
125 case 0x00d8: /* CK8 */
126 case 0x00e8: /* CK8S */
127 if (pci_set_consistent_dma_mask(pdev,
128 DMA_BIT_MASK(31)) < 0)
129 ehci_warn(ehci, "can't enable NVidia "
130 "workaround for >2GB RAM\n");
133 /* Some NForce2 chips have problems with selective suspend;
134 * fixed in newer silicon.
137 if (pdev->revision < 0xa4)
138 ehci->no_selective_suspend = 1;
142 case PCI_VENDOR_ID_INTEL:
143 if (pdev->device == PCI_DEVICE_ID_INTEL_CE4100_USB)
146 case PCI_VENDOR_ID_TDI:
147 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI)
150 case PCI_VENDOR_ID_AMD:
152 if (usb_amd_quirk_pll_check())
153 ehci->amd_pll_fix = 1;
154 /* AMD8111 EHCI doesn't work, according to AMD errata */
155 if (pdev->device == 0x7463) {
156 ehci_info(ehci, "ignoring AMD8111 (errata)\n");
162 * EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
163 * read/write memory space which does not belong to it when
164 * there is NULL pointer with T-bit set to 1 in the frame list
165 * table. To avoid the issue, the frame list link pointer
166 * should always contain a valid pointer to a inactive qh.
168 if (pdev->device == 0x7808) {
169 ehci->use_dummy_qh = 1;
170 ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
173 case PCI_VENDOR_ID_VIA:
174 if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
177 /* The VT6212 defaults to a 1 usec EHCI sleep time which
178 * hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
179 * that sleep time use the conventional 10 usec.
181 pci_read_config_byte(pdev, 0x4b, &tmp);
184 pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
187 case PCI_VENDOR_ID_ATI:
189 if (usb_amd_quirk_pll_check())
190 ehci->amd_pll_fix = 1;
193 * EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
194 * read/write memory space which does not belong to it when
195 * there is NULL pointer with T-bit set to 1 in the frame list
196 * table. To avoid the issue, the frame list link pointer
197 * should always contain a valid pointer to a inactive qh.
199 if (pdev->device == 0x4396) {
200 ehci->use_dummy_qh = 1;
201 ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround\n");
203 /* SB600 and old version of SB700 have a bug in EHCI controller,
204 * which causes usb devices lose response in some cases.
206 if ((pdev->device == 0x4386 || pdev->device == 0x4396) &&
207 usb_amd_hang_symptom_quirk()) {
209 ehci_info(ehci, "applying AMD SB600/SB700 USB freeze workaround\n");
210 pci_read_config_byte(pdev, 0x53, &tmp);
211 pci_write_config_byte(pdev, 0x53, tmp | (1<<3));
214 case PCI_VENDOR_ID_NETMOS:
215 /* MosChip frame-index-register bug */
216 ehci_info(ehci, "applying MosChip frame-index workaround\n");
217 ehci->frame_index_bug = 1;
219 case PCI_VENDOR_ID_HUAWEI:
220 /* Synopsys HC bug */
221 if (pdev->device == 0xa239) {
222 ehci_info(ehci, "applying Synopsys HC workaround\n");
223 ehci->has_synopsys_hc_bug = 1;
228 /* optional debug port, normally in the first BAR */
229 temp = pci_find_capability(pdev, PCI_CAP_ID_DBG);
231 pci_read_config_dword(pdev, temp, &temp);
233 if (((temp >> 13) & 7) == 1) {
234 u32 hcs_params = ehci_readl(ehci,
235 &ehci->caps->hcs_params);
238 ehci->debug = hcd->regs + temp;
239 temp = ehci_readl(ehci, &ehci->debug->control);
240 ehci_info(ehci, "debug port %d%s\n",
241 HCS_DEBUG_PORT(hcs_params),
242 (temp & DBGP_ENABLED) ? " IN USE" : "");
243 if (!(temp & DBGP_ENABLED))
248 retval = ehci_setup(hcd);
252 /* These workarounds need to be applied after ehci_setup() */
253 switch (pdev->vendor) {
254 case PCI_VENDOR_ID_NEC:
255 case PCI_VENDOR_ID_INTEL:
256 case PCI_VENDOR_ID_AMD:
257 ehci->need_io_watchdog = 0;
259 case PCI_VENDOR_ID_NVIDIA:
260 switch (pdev->device) {
261 /* MCP89 chips on the MacBookAir3,1 give EPROTO when
262 * fetching device descriptors unless LPM is disabled.
263 * There are also intermittent problems enumerating
264 * devices with PPCD enabled.
267 ehci_info(ehci, "disable ppcd for nvidia mcp89\n");
269 ehci->command &= ~CMD_PPCEE;
275 /* at least the Genesys GL880S needs fixup here */
276 temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
278 if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
279 ehci_dbg(ehci, "bogus port configuration: "
280 "cc=%d x pcc=%d < ports=%d\n",
281 HCS_N_CC(ehci->hcs_params),
282 HCS_N_PCC(ehci->hcs_params),
283 HCS_N_PORTS(ehci->hcs_params));
285 switch (pdev->vendor) {
286 case 0x17a0: /* GENESYS */
287 /* GL880S: should be PORTS=2 */
288 temp |= (ehci->hcs_params & ~0xf);
289 ehci->hcs_params = temp;
291 case PCI_VENDOR_ID_NVIDIA:
292 /* NF4: should be PCC=10 */
297 /* Serial Bus Release Number is at PCI 0x60 offset */
298 if (pdev->vendor == PCI_VENDOR_ID_STMICRO
299 && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
300 ; /* ConneXT has no sbrn register */
302 pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
304 /* Keep this around for a while just in case some EHCI
305 * implementation uses legacy PCI PM support. This test
306 * can be removed on 17 Dec 2009 if the dev_warn() hasn't
307 * been triggered by then.
309 if (!device_can_wakeup(&pdev->dev)) {
312 pci_read_config_word(pdev, 0x62, &port_wake);
313 if (port_wake & 0x0001) {
314 dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
315 device_set_wakeup_capable(&pdev->dev, 1);
320 if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
321 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
324 retval = ehci_pci_reinit(ehci, pdev);
329 /*-------------------------------------------------------------------------*/
333 /* suspend/resume, section 4.3 */
335 /* These routines rely on the PCI bus glue
336 * to handle powerdown and wakeup, and currently also on
337 * transceivers that don't need any software attention to set up
338 * the right sort of wakeup.
339 * Also they depend on separate root hub suspend/resume.
342 static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
344 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
345 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
347 if (ehci_resume(hcd, hibernated) != 0)
348 (void) ehci_pci_reinit(ehci, pdev);
354 #define ehci_suspend NULL
355 #define ehci_pci_resume NULL
356 #endif /* CONFIG_PM */
358 static struct hc_driver __read_mostly ehci_pci_hc_driver;
360 static const struct ehci_driver_overrides pci_overrides __initconst = {
361 .reset = ehci_pci_setup,
364 /*-------------------------------------------------------------------------*/
366 static int ehci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
368 if (is_bypassed_id(pdev))
370 return usb_hcd_pci_probe(pdev, id, &ehci_pci_hc_driver);
373 static void ehci_pci_remove(struct pci_dev *pdev)
376 usb_hcd_pci_remove(pdev);
379 /* PCI driver selection metadata; PCI hotplugging uses this */
380 static const struct pci_device_id pci_ids [] = { {
381 /* handle any USB 2.0 EHCI controller */
382 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
384 PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST),
386 { /* end: all zeroes */ }
388 MODULE_DEVICE_TABLE(pci, pci_ids);
390 /* pci driver glue; this is a "new style" PCI driver module */
391 static struct pci_driver ehci_pci_driver = {
395 .probe = ehci_pci_probe,
396 .remove = ehci_pci_remove,
397 .shutdown = usb_hcd_pci_shutdown,
401 .pm = &usb_hcd_pci_pm_ops
406 static int __init ehci_pci_init(void)
411 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
413 ehci_init_driver(&ehci_pci_hc_driver, &pci_overrides);
415 /* Entries for the PCI suspend/resume callbacks are special */
416 ehci_pci_hc_driver.pci_suspend = ehci_suspend;
417 ehci_pci_hc_driver.pci_resume = ehci_pci_resume;
419 return pci_register_driver(&ehci_pci_driver);
421 module_init(ehci_pci_init);
423 static void __exit ehci_pci_cleanup(void)
425 pci_unregister_driver(&ehci_pci_driver);
427 module_exit(ehci_pci_cleanup);
429 MODULE_DESCRIPTION(DRIVER_DESC);
430 MODULE_AUTHOR("David Brownell");
431 MODULE_AUTHOR("Alan Stern");
432 MODULE_LICENSE("GPL");