Merge tag 'tty-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[linux-2.6-microblaze.git] / drivers / usb / host / xhci-mtk.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * MediaTek xHCI Host Controller Driver
4  *
5  * Copyright (c) 2015 MediaTek Inc.
6  * Author:
7  *  Chunfeng Yun <chunfeng.yun@mediatek.com>
8  */
9
10 #include <linux/dma-mapping.h>
11 #include <linux/iopoll.h>
12 #include <linux/kernel.h>
13 #include <linux/mfd/syscon.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/pm_wakeirq.h>
19 #include <linux/regmap.h>
20 #include <linux/regulator/consumer.h>
21
22 #include "xhci.h"
23 #include "xhci-mtk.h"
24
25 /* ip_pw_ctrl0 register */
26 #define CTRL0_IP_SW_RST BIT(0)
27
28 /* ip_pw_ctrl1 register */
29 #define CTRL1_IP_HOST_PDN       BIT(0)
30
31 /* ip_pw_ctrl2 register */
32 #define CTRL2_IP_DEV_PDN        BIT(0)
33
34 /* ip_pw_sts1 register */
35 #define STS1_IP_SLEEP_STS       BIT(30)
36 #define STS1_U3_MAC_RST BIT(16)
37 #define STS1_XHCI_RST           BIT(11)
38 #define STS1_SYS125_RST BIT(10)
39 #define STS1_REF_RST            BIT(8)
40 #define STS1_SYSPLL_STABLE      BIT(0)
41
42 /* ip_xhci_cap register */
43 #define CAP_U3_PORT_NUM(p)      ((p) & 0xff)
44 #define CAP_U2_PORT_NUM(p)      (((p) >> 8) & 0xff)
45
46 /* u3_ctrl_p register */
47 #define CTRL_U3_PORT_HOST_SEL   BIT(2)
48 #define CTRL_U3_PORT_PDN        BIT(1)
49 #define CTRL_U3_PORT_DIS        BIT(0)
50
51 /* u2_ctrl_p register */
52 #define CTRL_U2_PORT_HOST_SEL   BIT(2)
53 #define CTRL_U2_PORT_PDN        BIT(1)
54 #define CTRL_U2_PORT_DIS        BIT(0)
55
56 /* u2_phy_pll register */
57 #define CTRL_U2_FORCE_PLL_STB   BIT(28)
58
59 /* usb remote wakeup registers in syscon */
60
61 /* mt8173 etc */
62 #define PERI_WK_CTRL1   0x4
63 #define WC1_IS_C(x)     (((x) & 0xf) << 26)  /* cycle debounce */
64 #define WC1_IS_EN       BIT(25)
65 #define WC1_IS_P        BIT(6)  /* polarity for ip sleep */
66
67 /* mt8183 */
68 #define PERI_WK_CTRL0   0x0
69 #define WC0_IS_C(x)     ((u32)(((x) & 0xf) << 28))  /* cycle debounce */
70 #define WC0_IS_P        BIT(12) /* polarity */
71 #define WC0_IS_EN       BIT(6)
72
73 /* mt8192 */
74 #define WC0_SSUSB0_CDEN         BIT(6)
75 #define WC0_IS_SPM_EN           BIT(1)
76
77 /* mt2712 etc */
78 #define PERI_SSUSB_SPM_CTRL     0x0
79 #define SSC_IP_SLEEP_EN BIT(4)
80 #define SSC_SPM_INT_EN          BIT(1)
81
82 enum ssusb_uwk_vers {
83         SSUSB_UWK_V1 = 1,
84         SSUSB_UWK_V2,
85         SSUSB_UWK_V1_1 = 101,   /* specific revision 1.01 */
86         SSUSB_UWK_V1_2,         /* specific revision 1.2 */
87 };
88
89 static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk)
90 {
91         struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs;
92         u32 value, check_val;
93         int u3_ports_disabled = 0;
94         int ret;
95         int i;
96
97         if (!mtk->has_ippc)
98                 return 0;
99
100         /* power on host ip */
101         value = readl(&ippc->ip_pw_ctr1);
102         value &= ~CTRL1_IP_HOST_PDN;
103         writel(value, &ippc->ip_pw_ctr1);
104
105         /* power on and enable u3 ports except skipped ones */
106         for (i = 0; i < mtk->num_u3_ports; i++) {
107                 if ((0x1 << i) & mtk->u3p_dis_msk) {
108                         u3_ports_disabled++;
109                         continue;
110                 }
111
112                 value = readl(&ippc->u3_ctrl_p[i]);
113                 value &= ~(CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS);
114                 value |= CTRL_U3_PORT_HOST_SEL;
115                 writel(value, &ippc->u3_ctrl_p[i]);
116         }
117
118         /* power on and enable all u2 ports */
119         for (i = 0; i < mtk->num_u2_ports; i++) {
120                 value = readl(&ippc->u2_ctrl_p[i]);
121                 value &= ~(CTRL_U2_PORT_PDN | CTRL_U2_PORT_DIS);
122                 value |= CTRL_U2_PORT_HOST_SEL;
123                 writel(value, &ippc->u2_ctrl_p[i]);
124         }
125
126         /*
127          * wait for clocks to be stable, and clock domains reset to
128          * be inactive after power on and enable ports
129          */
130         check_val = STS1_SYSPLL_STABLE | STS1_REF_RST |
131                         STS1_SYS125_RST | STS1_XHCI_RST;
132
133         if (mtk->num_u3_ports > u3_ports_disabled)
134                 check_val |= STS1_U3_MAC_RST;
135
136         ret = readl_poll_timeout(&ippc->ip_pw_sts1, value,
137                           (check_val == (value & check_val)), 100, 20000);
138         if (ret) {
139                 dev_err(mtk->dev, "clocks are not stable (0x%x)\n", value);
140                 return ret;
141         }
142
143         return 0;
144 }
145
146 static int xhci_mtk_host_disable(struct xhci_hcd_mtk *mtk)
147 {
148         struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs;
149         u32 value;
150         int ret;
151         int i;
152
153         if (!mtk->has_ippc)
154                 return 0;
155
156         /* power down u3 ports except skipped ones */
157         for (i = 0; i < mtk->num_u3_ports; i++) {
158                 if ((0x1 << i) & mtk->u3p_dis_msk)
159                         continue;
160
161                 value = readl(&ippc->u3_ctrl_p[i]);
162                 value |= CTRL_U3_PORT_PDN;
163                 writel(value, &ippc->u3_ctrl_p[i]);
164         }
165
166         /* power down all u2 ports */
167         for (i = 0; i < mtk->num_u2_ports; i++) {
168                 value = readl(&ippc->u2_ctrl_p[i]);
169                 value |= CTRL_U2_PORT_PDN;
170                 writel(value, &ippc->u2_ctrl_p[i]);
171         }
172
173         /* power down host ip */
174         value = readl(&ippc->ip_pw_ctr1);
175         value |= CTRL1_IP_HOST_PDN;
176         writel(value, &ippc->ip_pw_ctr1);
177
178         /* wait for host ip to sleep */
179         ret = readl_poll_timeout(&ippc->ip_pw_sts1, value,
180                           (value & STS1_IP_SLEEP_STS), 100, 100000);
181         if (ret) {
182                 dev_err(mtk->dev, "ip sleep failed!!!\n");
183                 return ret;
184         }
185         return 0;
186 }
187
188 static int xhci_mtk_ssusb_config(struct xhci_hcd_mtk *mtk)
189 {
190         struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs;
191         u32 value;
192
193         if (!mtk->has_ippc)
194                 return 0;
195
196         /* reset whole ip */
197         value = readl(&ippc->ip_pw_ctr0);
198         value |= CTRL0_IP_SW_RST;
199         writel(value, &ippc->ip_pw_ctr0);
200         udelay(1);
201         value = readl(&ippc->ip_pw_ctr0);
202         value &= ~CTRL0_IP_SW_RST;
203         writel(value, &ippc->ip_pw_ctr0);
204
205         /*
206          * device ip is default power-on in fact
207          * power down device ip, otherwise ip-sleep will fail
208          */
209         value = readl(&ippc->ip_pw_ctr2);
210         value |= CTRL2_IP_DEV_PDN;
211         writel(value, &ippc->ip_pw_ctr2);
212
213         value = readl(&ippc->ip_xhci_cap);
214         mtk->num_u3_ports = CAP_U3_PORT_NUM(value);
215         mtk->num_u2_ports = CAP_U2_PORT_NUM(value);
216         dev_dbg(mtk->dev, "%s u2p:%d, u3p:%d\n", __func__,
217                         mtk->num_u2_ports, mtk->num_u3_ports);
218
219         return xhci_mtk_host_enable(mtk);
220 }
221
222 /* only clocks can be turn off for ip-sleep wakeup mode */
223 static void usb_wakeup_ip_sleep_set(struct xhci_hcd_mtk *mtk, bool enable)
224 {
225         u32 reg, msk, val;
226
227         switch (mtk->uwk_vers) {
228         case SSUSB_UWK_V1:
229                 reg = mtk->uwk_reg_base + PERI_WK_CTRL1;
230                 msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P;
231                 val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0;
232                 break;
233         case SSUSB_UWK_V1_1:
234                 reg = mtk->uwk_reg_base + PERI_WK_CTRL0;
235                 msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
236                 val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
237                 break;
238         case SSUSB_UWK_V1_2:
239                 reg = mtk->uwk_reg_base + PERI_WK_CTRL0;
240                 msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN;
241                 val = enable ? msk : 0;
242                 break;
243         case SSUSB_UWK_V2:
244                 reg = mtk->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
245                 msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
246                 val = enable ? msk : 0;
247                 break;
248         default:
249                 return;
250         }
251         regmap_update_bits(mtk->uwk, reg, msk, val);
252 }
253
254 static int usb_wakeup_of_property_parse(struct xhci_hcd_mtk *mtk,
255                                 struct device_node *dn)
256 {
257         struct of_phandle_args args;
258         int ret;
259
260         /* Wakeup function is optional */
261         mtk->uwk_en = of_property_read_bool(dn, "wakeup-source");
262         if (!mtk->uwk_en)
263                 return 0;
264
265         ret = of_parse_phandle_with_fixed_args(dn,
266                                 "mediatek,syscon-wakeup", 2, 0, &args);
267         if (ret)
268                 return ret;
269
270         mtk->uwk_reg_base = args.args[0];
271         mtk->uwk_vers = args.args[1];
272         mtk->uwk = syscon_node_to_regmap(args.np);
273         of_node_put(args.np);
274         dev_info(mtk->dev, "uwk - reg:0x%x, version:%d\n",
275                         mtk->uwk_reg_base, mtk->uwk_vers);
276
277         return PTR_ERR_OR_ZERO(mtk->uwk);
278 }
279
280 static void usb_wakeup_set(struct xhci_hcd_mtk *mtk, bool enable)
281 {
282         if (mtk->uwk_en)
283                 usb_wakeup_ip_sleep_set(mtk, enable);
284 }
285
286 static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
287 {
288         struct clk_bulk_data *clks = mtk->clks;
289
290         clks[0].id = "sys_ck";
291         clks[1].id = "xhci_ck";
292         clks[2].id = "ref_ck";
293         clks[3].id = "mcu_ck";
294         clks[4].id = "dma_ck";
295
296         return devm_clk_bulk_get_optional(mtk->dev, BULK_CLKS_NUM, clks);
297 }
298
299 static int xhci_mtk_ldos_enable(struct xhci_hcd_mtk *mtk)
300 {
301         int ret;
302
303         ret = regulator_enable(mtk->vbus);
304         if (ret) {
305                 dev_err(mtk->dev, "failed to enable vbus\n");
306                 return ret;
307         }
308
309         ret = regulator_enable(mtk->vusb33);
310         if (ret) {
311                 dev_err(mtk->dev, "failed to enable vusb33\n");
312                 regulator_disable(mtk->vbus);
313                 return ret;
314         }
315         return 0;
316 }
317
318 static void xhci_mtk_ldos_disable(struct xhci_hcd_mtk *mtk)
319 {
320         regulator_disable(mtk->vbus);
321         regulator_disable(mtk->vusb33);
322 }
323
324 static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
325 {
326         struct usb_hcd *hcd = xhci_to_hcd(xhci);
327         struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
328
329         /*
330          * As of now platform drivers don't provide MSI support so we ensure
331          * here that the generic code does not try to make a pci_dev from our
332          * dev struct in order to setup MSI
333          */
334         xhci->quirks |= XHCI_PLAT;
335         xhci->quirks |= XHCI_MTK_HOST;
336         /*
337          * MTK host controller gives a spurious successful event after a
338          * short transfer. Ignore it.
339          */
340         xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
341         if (mtk->lpm_support)
342                 xhci->quirks |= XHCI_LPM_SUPPORT;
343         if (mtk->u2_lpm_disable)
344                 xhci->quirks |= XHCI_HW_LPM_DISABLE;
345
346         /*
347          * MTK xHCI 0.96: PSA is 1 by default even if doesn't support stream,
348          * and it's 3 when support it.
349          */
350         if (xhci->hci_version < 0x100 && HCC_MAX_PSA(xhci->hcc_params) == 4)
351                 xhci->quirks |= XHCI_BROKEN_STREAMS;
352 }
353
354 /* called during probe() after chip reset completes */
355 static int xhci_mtk_setup(struct usb_hcd *hcd)
356 {
357         struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
358         int ret;
359
360         if (usb_hcd_is_primary_hcd(hcd)) {
361                 ret = xhci_mtk_ssusb_config(mtk);
362                 if (ret)
363                         return ret;
364         }
365
366         ret = xhci_gen_setup(hcd, xhci_mtk_quirks);
367         if (ret)
368                 return ret;
369
370         if (usb_hcd_is_primary_hcd(hcd)) {
371                 ret = xhci_mtk_sch_init(mtk);
372                 if (ret)
373                         return ret;
374         }
375
376         return ret;
377 }
378
379 static const struct xhci_driver_overrides xhci_mtk_overrides __initconst = {
380         .reset = xhci_mtk_setup,
381         .add_endpoint = xhci_mtk_add_ep,
382         .drop_endpoint = xhci_mtk_drop_ep,
383         .check_bandwidth = xhci_mtk_check_bandwidth,
384         .reset_bandwidth = xhci_mtk_reset_bandwidth,
385 };
386
387 static struct hc_driver __read_mostly xhci_mtk_hc_driver;
388
389 static int xhci_mtk_probe(struct platform_device *pdev)
390 {
391         struct device *dev = &pdev->dev;
392         struct device_node *node = dev->of_node;
393         struct xhci_hcd_mtk *mtk;
394         const struct hc_driver *driver;
395         struct xhci_hcd *xhci;
396         struct resource *res;
397         struct usb_hcd *hcd;
398         int ret = -ENODEV;
399         int wakeup_irq;
400         int irq;
401
402         if (usb_disabled())
403                 return -ENODEV;
404
405         driver = &xhci_mtk_hc_driver;
406         mtk = devm_kzalloc(dev, sizeof(*mtk), GFP_KERNEL);
407         if (!mtk)
408                 return -ENOMEM;
409
410         mtk->dev = dev;
411         mtk->vbus = devm_regulator_get(dev, "vbus");
412         if (IS_ERR(mtk->vbus)) {
413                 dev_err(dev, "fail to get vbus\n");
414                 return PTR_ERR(mtk->vbus);
415         }
416
417         mtk->vusb33 = devm_regulator_get(dev, "vusb33");
418         if (IS_ERR(mtk->vusb33)) {
419                 dev_err(dev, "fail to get vusb33\n");
420                 return PTR_ERR(mtk->vusb33);
421         }
422
423         ret = xhci_mtk_clks_get(mtk);
424         if (ret)
425                 return ret;
426
427         irq = platform_get_irq_byname_optional(pdev, "host");
428         if (irq < 0) {
429                 if (irq == -EPROBE_DEFER)
430                         return irq;
431
432                 /* for backward compatibility */
433                 irq = platform_get_irq(pdev, 0);
434                 if (irq < 0)
435                         return irq;
436         }
437
438         wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
439         if (wakeup_irq == -EPROBE_DEFER)
440                 return wakeup_irq;
441
442         mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
443         mtk->u2_lpm_disable = of_property_read_bool(node, "usb2-lpm-disable");
444         /* optional property, ignore the error if it does not exist */
445         of_property_read_u32(node, "mediatek,u3p-dis-msk",
446                              &mtk->u3p_dis_msk);
447
448         ret = usb_wakeup_of_property_parse(mtk, node);
449         if (ret) {
450                 dev_err(dev, "failed to parse uwk property\n");
451                 return ret;
452         }
453
454         pm_runtime_set_active(dev);
455         pm_runtime_use_autosuspend(dev);
456         pm_runtime_set_autosuspend_delay(dev, 4000);
457         pm_runtime_enable(dev);
458         pm_runtime_get_sync(dev);
459
460         ret = xhci_mtk_ldos_enable(mtk);
461         if (ret)
462                 goto disable_pm;
463
464         ret = clk_bulk_prepare_enable(BULK_CLKS_NUM, mtk->clks);
465         if (ret)
466                 goto disable_ldos;
467
468         hcd = usb_create_hcd(driver, dev, dev_name(dev));
469         if (!hcd) {
470                 ret = -ENOMEM;
471                 goto disable_clk;
472         }
473
474         /*
475          * USB 2.0 roothub is stored in the platform_device.
476          * Swap it with mtk HCD.
477          */
478         mtk->hcd = platform_get_drvdata(pdev);
479         platform_set_drvdata(pdev, mtk);
480
481         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac");
482         hcd->regs = devm_ioremap_resource(dev, res);
483         if (IS_ERR(hcd->regs)) {
484                 ret = PTR_ERR(hcd->regs);
485                 goto put_usb2_hcd;
486         }
487         hcd->rsrc_start = res->start;
488         hcd->rsrc_len = resource_size(res);
489
490         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
491         if (res) {      /* ippc register is optional */
492                 mtk->ippc_regs = devm_ioremap_resource(dev, res);
493                 if (IS_ERR(mtk->ippc_regs)) {
494                         ret = PTR_ERR(mtk->ippc_regs);
495                         goto put_usb2_hcd;
496                 }
497                 mtk->has_ippc = true;
498         }
499
500         device_init_wakeup(dev, true);
501
502         xhci = hcd_to_xhci(hcd);
503         xhci->main_hcd = hcd;
504
505         /*
506          * imod_interval is the interrupt moderation value in nanoseconds.
507          * The increment interval is 8 times as much as that defined in
508          * the xHCI spec on MTK's controller.
509          */
510         xhci->imod_interval = 5000;
511         device_property_read_u32(dev, "imod-interval-ns", &xhci->imod_interval);
512
513         xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
514                         dev_name(dev), hcd);
515         if (!xhci->shared_hcd) {
516                 ret = -ENOMEM;
517                 goto disable_device_wakeup;
518         }
519
520         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
521         if (ret)
522                 goto put_usb3_hcd;
523
524         if (HCC_MAX_PSA(xhci->hcc_params) >= 4 &&
525             !(xhci->quirks & XHCI_BROKEN_STREAMS))
526                 xhci->shared_hcd->can_do_streams = 1;
527
528         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
529         if (ret)
530                 goto dealloc_usb2_hcd;
531
532         if (wakeup_irq > 0) {
533                 ret = dev_pm_set_dedicated_wake_irq(dev, wakeup_irq);
534                 if (ret) {
535                         dev_err(dev, "set wakeup irq %d failed\n", wakeup_irq);
536                         goto dealloc_usb3_hcd;
537                 }
538                 dev_info(dev, "wakeup irq %d\n", wakeup_irq);
539         }
540
541         device_enable_async_suspend(dev);
542         pm_runtime_mark_last_busy(dev);
543         pm_runtime_put_autosuspend(dev);
544         pm_runtime_forbid(dev);
545
546         return 0;
547
548 dealloc_usb3_hcd:
549         usb_remove_hcd(xhci->shared_hcd);
550         xhci->shared_hcd = NULL;
551
552 dealloc_usb2_hcd:
553         usb_remove_hcd(hcd);
554
555 put_usb3_hcd:
556         xhci_mtk_sch_exit(mtk);
557         usb_put_hcd(xhci->shared_hcd);
558
559 disable_device_wakeup:
560         device_init_wakeup(dev, false);
561
562 put_usb2_hcd:
563         usb_put_hcd(hcd);
564
565 disable_clk:
566         clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
567
568 disable_ldos:
569         xhci_mtk_ldos_disable(mtk);
570
571 disable_pm:
572         pm_runtime_put_sync_autosuspend(dev);
573         pm_runtime_disable(dev);
574         return ret;
575 }
576
577 static int xhci_mtk_remove(struct platform_device *pdev)
578 {
579         struct xhci_hcd_mtk *mtk = platform_get_drvdata(pdev);
580         struct usb_hcd  *hcd = mtk->hcd;
581         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
582         struct usb_hcd  *shared_hcd = xhci->shared_hcd;
583         struct device *dev = &pdev->dev;
584
585         pm_runtime_get_sync(dev);
586         xhci->xhc_state |= XHCI_STATE_REMOVING;
587         dev_pm_clear_wake_irq(dev);
588         device_init_wakeup(dev, false);
589
590         usb_remove_hcd(shared_hcd);
591         xhci->shared_hcd = NULL;
592         usb_remove_hcd(hcd);
593         usb_put_hcd(shared_hcd);
594         usb_put_hcd(hcd);
595         xhci_mtk_sch_exit(mtk);
596         clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
597         xhci_mtk_ldos_disable(mtk);
598
599         pm_runtime_disable(dev);
600         pm_runtime_put_noidle(dev);
601         pm_runtime_set_suspended(dev);
602
603         return 0;
604 }
605
606 static int __maybe_unused xhci_mtk_suspend(struct device *dev)
607 {
608         struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
609         struct usb_hcd *hcd = mtk->hcd;
610         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
611         int ret;
612
613         xhci_dbg(xhci, "%s: stop port polling\n", __func__);
614         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
615         del_timer_sync(&hcd->rh_timer);
616         clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
617         del_timer_sync(&xhci->shared_hcd->rh_timer);
618
619         ret = xhci_mtk_host_disable(mtk);
620         if (ret)
621                 goto restart_poll_rh;
622
623         clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
624         usb_wakeup_set(mtk, true);
625         return 0;
626
627 restart_poll_rh:
628         xhci_dbg(xhci, "%s: restart port polling\n", __func__);
629         set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
630         usb_hcd_poll_rh_status(xhci->shared_hcd);
631         set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
632         usb_hcd_poll_rh_status(hcd);
633         return ret;
634 }
635
636 static int __maybe_unused xhci_mtk_resume(struct device *dev)
637 {
638         struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
639         struct usb_hcd *hcd = mtk->hcd;
640         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
641         int ret;
642
643         usb_wakeup_set(mtk, false);
644         ret = clk_bulk_prepare_enable(BULK_CLKS_NUM, mtk->clks);
645         if (ret)
646                 goto enable_wakeup;
647
648         ret = xhci_mtk_host_enable(mtk);
649         if (ret)
650                 goto disable_clks;
651
652         xhci_dbg(xhci, "%s: restart port polling\n", __func__);
653         set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
654         usb_hcd_poll_rh_status(xhci->shared_hcd);
655         set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
656         usb_hcd_poll_rh_status(hcd);
657         return 0;
658
659 disable_clks:
660         clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
661 enable_wakeup:
662         usb_wakeup_set(mtk, true);
663         return ret;
664 }
665
666 static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev)
667 {
668         struct xhci_hcd_mtk  *mtk = dev_get_drvdata(dev);
669         struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
670         int ret = 0;
671
672         if (xhci->xhc_state)
673                 return -ESHUTDOWN;
674
675         if (device_may_wakeup(dev))
676                 ret = xhci_mtk_suspend(dev);
677
678         /* -EBUSY: let PM automatically reschedule another autosuspend */
679         return ret ? -EBUSY : 0;
680 }
681
682 static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev)
683 {
684         struct xhci_hcd_mtk  *mtk = dev_get_drvdata(dev);
685         struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
686         int ret = 0;
687
688         if (xhci->xhc_state)
689                 return -ESHUTDOWN;
690
691         if (device_may_wakeup(dev))
692                 ret = xhci_mtk_resume(dev);
693
694         return ret;
695 }
696
697 static const struct dev_pm_ops xhci_mtk_pm_ops = {
698         SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume)
699         SET_RUNTIME_PM_OPS(xhci_mtk_runtime_suspend,
700                            xhci_mtk_runtime_resume, NULL)
701 };
702
703 #define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL)
704
705 static const struct of_device_id mtk_xhci_of_match[] = {
706         { .compatible = "mediatek,mt8173-xhci"},
707         { .compatible = "mediatek,mtk-xhci"},
708         { },
709 };
710 MODULE_DEVICE_TABLE(of, mtk_xhci_of_match);
711
712 static struct platform_driver mtk_xhci_driver = {
713         .probe  = xhci_mtk_probe,
714         .remove = xhci_mtk_remove,
715         .driver = {
716                 .name = "xhci-mtk",
717                 .pm = DEV_PM_OPS,
718                 .of_match_table = mtk_xhci_of_match,
719         },
720 };
721
722 static int __init xhci_mtk_init(void)
723 {
724         xhci_init_driver(&xhci_mtk_hc_driver, &xhci_mtk_overrides);
725         return platform_driver_register(&mtk_xhci_driver);
726 }
727 module_init(xhci_mtk_init);
728
729 static void __exit xhci_mtk_exit(void)
730 {
731         platform_driver_unregister(&mtk_xhci_driver);
732 }
733 module_exit(xhci_mtk_exit);
734
735 MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
736 MODULE_DESCRIPTION("MediaTek xHCI Host Controller Driver");
737 MODULE_LICENSE("GPL v2");