1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
2  *
3  * This program is free software; you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License version 2 and
5  * only version 2 as published by the Free Software Foundation.
6  */
7 
8 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 #include <linux/pm_runtime.h>
11 #include <linux/usb/msm_hsusb_hw.h>
12 #include <linux/usb/ulpi.h>
13 #include <linux/usb/gadget.h>
14 #include <linux/usb/chipidea.h>
15 
16 #include "ci.h"
17 
18 #define MSM_USB_BASE	(ci->hw_bank.abs)
19 
20 static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
21 {
22 	struct device *dev = ci->gadget.dev.parent;
23 
24 	switch (event) {
25 	case CI_HDRC_CONTROLLER_RESET_EVENT:
26 		dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
27 		writel(0, USB_AHBBURST);
28 		/* use AHB transactor, allow posted data writes */
29 		writel(0x8, USB_AHBMODE);
30 		usb_phy_init(ci->usb_phy);
31 		break;
32 	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
33 		dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
34 		/*
35 		 * Put the phy in non-driving mode. Otherwise host
36 		 * may not detect soft-disconnection.
37 		 */
38 		usb_phy_notify_disconnect(ci->usb_phy, USB_SPEED_UNKNOWN);
39 		break;
40 	default:
41 		dev_dbg(dev, "unknown ci_hdrc event\n");
42 		break;
43 	}
44 }
45 
46 static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
47 	.name			= "ci_hdrc_msm",
48 	.capoffset		= DEF_CAPOFFSET,
49 	.flags			= CI_HDRC_REGS_SHARED |
50 				  CI_HDRC_DISABLE_STREAMING,
51 
52 	.notify_event		= ci_hdrc_msm_notify_event,
53 };
54 
55 static int ci_hdrc_msm_probe(struct platform_device *pdev)
56 {
57 	struct platform_device *plat_ci;
58 	struct usb_phy *phy;
59 
60 	dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
61 
62 	/*
63 	 * OTG(PHY) driver takes care of PHY initialization, clock management,
64 	 * powering up VBUS, mapping of registers address space and power
65 	 * management.
66 	 */
67 	phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
68 	if (IS_ERR(phy))
69 		return PTR_ERR(phy);
70 
71 	ci_hdrc_msm_platdata.usb_phy = phy;
72 
73 	plat_ci = ci_hdrc_add_device(&pdev->dev,
74 				pdev->resource, pdev->num_resources,
75 				&ci_hdrc_msm_platdata);
76 	if (IS_ERR(plat_ci)) {
77 		dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
78 		return PTR_ERR(plat_ci);
79 	}
80 
81 	platform_set_drvdata(pdev, plat_ci);
82 
83 	pm_runtime_no_callbacks(&pdev->dev);
84 	pm_runtime_enable(&pdev->dev);
85 
86 	return 0;
87 }
88 
89 static int ci_hdrc_msm_remove(struct platform_device *pdev)
90 {
91 	struct platform_device *plat_ci = platform_get_drvdata(pdev);
92 
93 	pm_runtime_disable(&pdev->dev);
94 	ci_hdrc_remove_device(plat_ci);
95 
96 	return 0;
97 }
98 
99 static const struct of_device_id msm_ci_dt_match[] = {
100 	{ .compatible = "qcom,ci-hdrc", },
101 	{ }
102 };
103 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
104 
105 static struct platform_driver ci_hdrc_msm_driver = {
106 	.probe = ci_hdrc_msm_probe,
107 	.remove = ci_hdrc_msm_remove,
108 	.driver = {
109 		.name = "msm_hsusb",
110 		.of_match_table = msm_ci_dt_match,
111 	},
112 };
113 
114 module_platform_driver(ci_hdrc_msm_driver);
115 
116 MODULE_ALIAS("platform:msm_hsusb");
117 MODULE_ALIAS("platform:ci13xxx_msm");
118 MODULE_LICENSE("GPL v2");
119