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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/usb/chipidea/core.c
....@@ -3,42 +3,16 @@
33  * core.c - ChipIdea USB IP core family device controller
44  *
55  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
6
+ * Copyright (C) 2020 NXP
67  *
78  * Author: David Lopo
8
- */
9
-
10
-/*
11
- * Description: ChipIdea USB IP core family device controller
9
+ *	   Peter Chen <peter.chen@nxp.com>
1210  *
13
- * This driver is composed of several blocks:
14
- * - HW:     hardware interface
15
- * - DBG:    debug facilities (optional)
16
- * - UTIL:   utilities
17
- * - ISR:    interrupts handling
18
- * - ENDPT:  endpoint operations (Gadget API)
19
- * - GADGET: gadget operations (Gadget API)
20
- * - BUS:    bus glue code, bus abstraction layer
21
- *
22
- * Compile Options
23
- * - STALL_IN:  non-empty bulk-in pipes cannot be halted
24
- *              if defined mass storage compliance succeeds but with warnings
25
- *              => case 4: Hi >  Dn
26
- *              => case 5: Hi >  Di
27
- *              => case 8: Hi <> Do
28
- *              if undefined usbtest 13 fails
29
- * - TRACE:     enable function tracing (depends on DEBUG)
30
- *
31
- * Main Features
32
- * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
33
- * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
34
- * - Normal & LPM support
35
- *
36
- * USBTEST Report
37
- * - OK: 0-12, 13 (STALL_IN defined) & 14
38
- * - Not Supported: 15 & 16 (ISO)
39
- *
40
- * TODO List
41
- * - Suspend & Remote Wakeup
11
+ * Main Features:
12
+ * - Four transfers are supported, usbtest is passed
13
+ * - USB Certification for gadget: CH9 and Mass Storage are passed
14
+ * - Low power mode
15
+ * - USB wakeup
4216  */
4317 #include <linux/delay.h>
4418 #include <linux/device.h>
....@@ -53,6 +27,7 @@
5327 #include <linux/kernel.h>
5428 #include <linux/slab.h>
5529 #include <linux/pm_runtime.h>
30
+#include <linux/pinctrl/consumer.h>
5631 #include <linux/usb/ch9.h>
5732 #include <linux/usb/gadget.h>
5833 #include <linux/usb/otg.h>
....@@ -180,6 +155,7 @@
180155 
181156 /**
182157  * hw_port_test_set: writes port test mode (execute without interruption)
158
+ * @ci: the controller
183159  * @mode: new value
184160  *
185161  * This function returns an error code
....@@ -271,7 +247,7 @@
271247 	ci->rev = ci_get_revision(ci);
272248 
273249 	dev_dbg(ci->dev,
274
-		"ChipIdea HDRC found, revision: %d, lpm: %d; cap: %p op: %p\n",
250
+		"revision: %d, lpm: %d; cap: %px op: %px\n",
275251 		ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
276252 
277253 	/* setup lock mode ? */
....@@ -522,8 +498,9 @@
522498 	hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
523499 
524500 	if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
525
-		pr_err("cannot enter in %s device mode", ci_role(ci)->name);
526
-		pr_err("lpm = %i", ci->hw_bank.lpm);
501
+		dev_err(ci->dev, "cannot enter in %s device mode\n",
502
+			ci_role(ci)->name);
503
+		dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
527504 		return -ENODEV;
528505 	}
529506 
....@@ -607,6 +584,75 @@
607584 	return NOTIFY_DONE;
608585 }
609586 
587
+static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
588
+{
589
+	struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
590
+	enum usb_role role;
591
+	unsigned long flags;
592
+
593
+	spin_lock_irqsave(&ci->lock, flags);
594
+	role = ci_role_to_usb_role(ci);
595
+	spin_unlock_irqrestore(&ci->lock, flags);
596
+
597
+	return role;
598
+}
599
+
600
+static int ci_usb_role_switch_set(struct usb_role_switch *sw,
601
+				  enum usb_role role)
602
+{
603
+	struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
604
+	struct ci_hdrc_cable *cable = NULL;
605
+	enum usb_role current_role = ci_role_to_usb_role(ci);
606
+	enum ci_role ci_role = usb_role_to_ci_role(role);
607
+	unsigned long flags;
608
+
609
+	if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
610
+	    (current_role == role))
611
+		return 0;
612
+
613
+	pm_runtime_get_sync(ci->dev);
614
+	/* Stop current role */
615
+	spin_lock_irqsave(&ci->lock, flags);
616
+	if (current_role == USB_ROLE_DEVICE)
617
+		cable = &ci->platdata->vbus_extcon;
618
+	else if (current_role == USB_ROLE_HOST)
619
+		cable = &ci->platdata->id_extcon;
620
+
621
+	if (cable) {
622
+		cable->changed = true;
623
+		cable->connected = false;
624
+		ci_irq(ci);
625
+		spin_unlock_irqrestore(&ci->lock, flags);
626
+		if (ci->wq && role != USB_ROLE_NONE)
627
+			flush_workqueue(ci->wq);
628
+		spin_lock_irqsave(&ci->lock, flags);
629
+	}
630
+
631
+	cable = NULL;
632
+
633
+	/* Start target role */
634
+	if (role == USB_ROLE_DEVICE)
635
+		cable = &ci->platdata->vbus_extcon;
636
+	else if (role == USB_ROLE_HOST)
637
+		cable = &ci->platdata->id_extcon;
638
+
639
+	if (cable) {
640
+		cable->changed = true;
641
+		cable->connected = true;
642
+		ci_irq(ci);
643
+	}
644
+	spin_unlock_irqrestore(&ci->lock, flags);
645
+	pm_runtime_put_sync(ci->dev);
646
+
647
+	return 0;
648
+}
649
+
650
+static struct usb_role_switch_desc ci_role_switch = {
651
+	.set = ci_usb_role_switch_set,
652
+	.get = ci_usb_role_switch_get,
653
+	.allow_userspace_control = true,
654
+};
655
+
610656 static int ci_get_platdata(struct device *dev,
611657 		struct ci_hdrc_platform_data *platdata)
612658 {
....@@ -625,7 +671,7 @@
625671 
626672 	if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
627673 		/* Get the vbus regulator */
628
-		platdata->reg_vbus = devm_regulator_get(dev, "vbus");
674
+		platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
629675 		if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
630676 			return -EPROBE_DEFER;
631677 		} else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
....@@ -732,6 +778,27 @@
732778 		else
733779 			cable->connected = false;
734780 	}
781
+
782
+	if (device_property_read_bool(dev, "usb-role-switch"))
783
+		ci_role_switch.fwnode = dev->fwnode;
784
+
785
+	platdata->pctl = devm_pinctrl_get(dev);
786
+	if (!IS_ERR(platdata->pctl)) {
787
+		struct pinctrl_state *p;
788
+
789
+		p = pinctrl_lookup_state(platdata->pctl, "default");
790
+		if (!IS_ERR(p))
791
+			platdata->pins_default = p;
792
+
793
+		p = pinctrl_lookup_state(platdata->pctl, "host");
794
+		if (!IS_ERR(p))
795
+			platdata->pins_host = p;
796
+
797
+		p = pinctrl_lookup_state(platdata->pctl, "device");
798
+		if (!IS_ERR(p))
799
+			platdata->pins_device = p;
800
+	}
801
+
735802 	return 0;
736803 }
737804 
....@@ -820,6 +887,33 @@
820887 }
821888 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
822889 
890
+/**
891
+ * ci_hdrc_query_available_role: get runtime available operation mode
892
+ *
893
+ * The glue layer can get current operation mode (host/peripheral/otg)
894
+ * This function should be called after ci core device has created.
895
+ *
896
+ * @pdev: the platform device of ci core.
897
+ *
898
+ * Return runtime usb_dr_mode.
899
+ */
900
+enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
901
+{
902
+	struct ci_hdrc *ci = platform_get_drvdata(pdev);
903
+
904
+	if (!ci)
905
+		return USB_DR_MODE_UNKNOWN;
906
+	if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
907
+		return USB_DR_MODE_OTG;
908
+	else if (ci->roles[CI_ROLE_HOST])
909
+		return USB_DR_MODE_HOST;
910
+	else if (ci->roles[CI_ROLE_GADGET])
911
+		return USB_DR_MODE_PERIPHERAL;
912
+	else
913
+		return USB_DR_MODE_UNKNOWN;
914
+}
915
+EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
916
+
823917 static inline void ci_role_destroy(struct ci_hdrc *ci)
824918 {
825919 	ci_hdrc_gadget_destroy(ci);
....@@ -872,8 +966,15 @@
872966 			     strlen(ci->roles[role]->name)))
873967 			break;
874968 
875
-	if (role == CI_ROLE_END || role == ci->role)
969
+	if (role == CI_ROLE_END)
876970 		return -EINVAL;
971
+
972
+	mutex_lock(&ci->mutex);
973
+
974
+	if (role == ci->role) {
975
+		mutex_unlock(&ci->mutex);
976
+		return n;
977
+	}
877978 
878979 	pm_runtime_get_sync(dev);
879980 	disable_irq(ci->irq);
....@@ -883,6 +984,7 @@
883984 		ci_handle_vbus_change(ci);
884985 	enable_irq(ci->irq);
885986 	pm_runtime_put_sync(dev);
987
+	mutex_unlock(&ci->mutex);
886988 
887989 	return (ret == 0) ? n : ret;
888990 }
....@@ -892,10 +994,7 @@
892994 	&dev_attr_role.attr,
893995 	NULL,
894996 };
895
-
896
-static const struct attribute_group ci_attr_group = {
897
-	.attrs = ci_attrs,
898
-};
997
+ATTRIBUTE_GROUPS(ci);
899998 
900999 static int ci_hdrc_probe(struct platform_device *pdev)
9011000 {
....@@ -921,6 +1020,7 @@
9211020 		return -ENOMEM;
9221021 
9231022 	spin_lock_init(&ci->lock);
1023
+	mutex_init(&ci->mutex);
9241024 	ci->dev = dev;
9251025 	ci->platdata = dev_get_platdata(dev);
9261026 	ci->imx28_write_fix = !!(ci->platdata->flags &
....@@ -944,45 +1044,59 @@
9441044 	} else if (ci->platdata->usb_phy) {
9451045 		ci->usb_phy = ci->platdata->usb_phy;
9461046 	} else {
947
-		ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent, "phys",
948
-							  0);
1047
+		/* Look for a generic PHY first */
9491048 		ci->phy = devm_phy_get(dev->parent, "usb-phy");
9501049 
951
-		/* Fallback to grabbing any registered USB2 PHY */
952
-		if (IS_ERR(ci->usb_phy) &&
953
-		    PTR_ERR(ci->usb_phy) != -EPROBE_DEFER)
1050
+		if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1051
+			ret = -EPROBE_DEFER;
1052
+			goto ulpi_exit;
1053
+		} else if (IS_ERR(ci->phy)) {
1054
+			ci->phy = NULL;
1055
+		}
1056
+
1057
+		/* Look for a legacy USB PHY from device-tree next */
1058
+		if (!ci->phy) {
1059
+			ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1060
+								  "phys", 0);
1061
+
1062
+			if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1063
+				ret = -EPROBE_DEFER;
1064
+				goto ulpi_exit;
1065
+			} else if (IS_ERR(ci->usb_phy)) {
1066
+				ci->usb_phy = NULL;
1067
+			}
1068
+		}
1069
+
1070
+		/* Look for any registered legacy USB PHY as last resort */
1071
+		if (!ci->phy && !ci->usb_phy) {
9541072 			ci->usb_phy = devm_usb_get_phy(dev->parent,
9551073 						       USB_PHY_TYPE_USB2);
9561074 
957
-		/* if both generic PHY and USB PHY layers aren't enabled */
958
-		if (PTR_ERR(ci->phy) == -ENOSYS &&
959
-				PTR_ERR(ci->usb_phy) == -ENXIO) {
1075
+			if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1076
+				ret = -EPROBE_DEFER;
1077
+				goto ulpi_exit;
1078
+			} else if (IS_ERR(ci->usb_phy)) {
1079
+				ci->usb_phy = NULL;
1080
+			}
1081
+		}
1082
+
1083
+		/* No USB PHY was found in the end */
1084
+		if (!ci->phy && !ci->usb_phy) {
9601085 			ret = -ENXIO;
9611086 			goto ulpi_exit;
9621087 		}
963
-
964
-		if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy)) {
965
-			ret = -EPROBE_DEFER;
966
-			goto ulpi_exit;
967
-		}
968
-
969
-		if (IS_ERR(ci->phy))
970
-			ci->phy = NULL;
971
-		else if (IS_ERR(ci->usb_phy))
972
-			ci->usb_phy = NULL;
9731088 	}
9741089 
9751090 	ret = ci_usb_phy_init(ci);
9761091 	if (ret) {
9771092 		dev_err(dev, "unable to init phy: %d\n", ret);
978
-		return ret;
1093
+		goto ulpi_exit;
9791094 	}
9801095 
9811096 	ci->hw_bank.phys = res->start;
9821097 
9831098 	ci->irq = platform_get_irq(pdev, 0);
9841099 	if (ci->irq < 0) {
985
-		dev_err(dev, "missing IRQ\n");
9861100 		ret = ci->irq;
9871101 		goto deinit_phy;
9881102 	}
....@@ -1025,6 +1139,16 @@
10251139 		}
10261140 	}
10271141 
1142
+	if (ci_role_switch.fwnode) {
1143
+		ci_role_switch.driver_data = ci;
1144
+		ci->role_switch = usb_role_switch_register(dev,
1145
+					&ci_role_switch);
1146
+		if (IS_ERR(ci->role_switch)) {
1147
+			ret = PTR_ERR(ci->role_switch);
1148
+			goto deinit_otg;
1149
+		}
1150
+	}
1151
+
10281152 	if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
10291153 		if (ci->is_otg) {
10301154 			ci->role = ci_otg_role(ci);
....@@ -1046,8 +1170,11 @@
10461170 
10471171 	if (!ci_otg_is_fsm_mode(ci)) {
10481172 		/* only update vbus status for peripheral */
1049
-		if (ci->role == CI_ROLE_GADGET)
1173
+		if (ci->role == CI_ROLE_GADGET) {
1174
+			/* Pull down DP for possible charger detection */
1175
+			hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
10501176 			ci_handle_vbus_change(ci);
1177
+		}
10511178 
10521179 		ret = ci_role_start(ci, ci->role);
10531180 		if (ret) {
....@@ -1080,15 +1207,12 @@
10801207 	device_set_wakeup_capable(&pdev->dev, true);
10811208 	dbg_create_files(ci);
10821209 
1083
-	ret = sysfs_create_group(&dev->kobj, &ci_attr_group);
1084
-	if (ret)
1085
-		goto remove_debug;
1086
-
10871210 	return 0;
10881211 
1089
-remove_debug:
1090
-	dbg_remove_files(ci);
10911212 stop:
1213
+	if (ci->role_switch)
1214
+		usb_role_switch_unregister(ci->role_switch);
1215
+deinit_otg:
10921216 	if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
10931217 		ci_hdrc_otg_destroy(ci);
10941218 deinit_gadget:
....@@ -1107,6 +1231,9 @@
11071231 {
11081232 	struct ci_hdrc *ci = platform_get_drvdata(pdev);
11091233 
1234
+	if (ci->role_switch)
1235
+		usb_role_switch_unregister(ci->role_switch);
1236
+
11101237 	if (ci->supports_runtime_pm) {
11111238 		pm_runtime_get_sync(&pdev->dev);
11121239 		pm_runtime_disable(&pdev->dev);
....@@ -1114,7 +1241,6 @@
11141241 	}
11151242 
11161243 	dbg_remove_files(ci);
1117
-	sysfs_remove_group(&ci->dev->kobj, &ci_attr_group);
11181244 	ci_role_destroy(ci);
11191245 	ci_hdrc_enter_lpm(ci, true);
11201246 	ci_usb_phy_exit(ci);
....@@ -1317,6 +1443,7 @@
13171443 	.driver	= {
13181444 		.name	= "ci_hdrc",
13191445 		.pm	= &ci_pm_ops,
1446
+		.dev_groups = ci_groups,
13201447 	},
13211448 };
13221449