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b0848aea PK |
1 | /* ehci-msm.c - HSUSB Host Controller Driver Implementation |
2 | * | |
18f53461 | 3 | * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved. |
b0848aea PK |
4 | * |
5 | * Partly derived from ehci-fsl.c and ehci-hcd.c | |
6 | * Copyright (c) 2000-2004 by David Brownell | |
7 | * Copyright (c) 2005 MontaVista Software | |
8 | * | |
9 | * All source code in this file is licensed under the following license except | |
10 | * where indicated. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License version 2 as published | |
14 | * by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
19 | * | |
20 | * See the GNU General Public License for more details. | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, you can find it at http://www.fsf.org | |
23 | */ | |
24 | ||
b0848aea PK |
25 | #include <linux/clk.h> |
26 | #include <linux/err.h> | |
8c68e84f MG |
27 | #include <linux/io.h> |
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/platform_device.h> | |
8bb6a164 | 31 | #include <linux/pm_runtime.h> |
b0848aea PK |
32 | #include <linux/usb/otg.h> |
33 | #include <linux/usb/msm_hsusb_hw.h> | |
8c68e84f MG |
34 | #include <linux/usb.h> |
35 | #include <linux/usb/hcd.h> | |
36 | ||
37 | #include "ehci.h" | |
b0848aea PK |
38 | |
39 | #define MSM_USB_BASE (hcd->regs) | |
40 | ||
8c68e84f MG |
41 | #define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller" |
42 | ||
43 | static const char hcd_name[] = "ehci-msm"; | |
44 | static struct hc_driver __read_mostly msm_hc_driver; | |
b0848aea | 45 | |
b0848aea PK |
46 | static int ehci_msm_reset(struct usb_hcd *hcd) |
47 | { | |
48 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
49 | int retval; | |
50 | ||
51 | ehci->caps = USB_CAPLENGTH; | |
b0848aea | 52 | hcd->has_tt = 1; |
b0848aea | 53 | |
2cb30bb1 | 54 | retval = ehci_setup(hcd); |
b0848aea PK |
55 | if (retval) |
56 | return retval; | |
57 | ||
58 | /* bursts of unspecified length. */ | |
59 | writel(0, USB_AHBBURST); | |
c56a2b2b AG |
60 | /* Use the AHB transactor, allow posted data writes */ |
61 | writel(0x8, USB_AHBMODE); | |
b0848aea PK |
62 | /* Disable streaming mode and select host mode */ |
63 | writel(0x13, USB_USBMODE); | |
64 | ||
b0848aea PK |
65 | return 0; |
66 | } | |
67 | ||
b0848aea PK |
68 | static int ehci_msm_probe(struct platform_device *pdev) |
69 | { | |
70 | struct usb_hcd *hcd; | |
71 | struct resource *res; | |
e4f0da05 | 72 | struct usb_phy *phy; |
b0848aea PK |
73 | int ret; |
74 | ||
75 | dev_dbg(&pdev->dev, "ehci_msm proble\n"); | |
76 | ||
77 | hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev)); | |
78 | if (!hcd) { | |
79 | dev_err(&pdev->dev, "Unable to create HCD\n"); | |
80 | return -ENOMEM; | |
81 | } | |
82 | ||
0c43e9d8 AH |
83 | ret = platform_get_irq(pdev, 0); |
84 | if (ret < 0) { | |
b0848aea | 85 | dev_err(&pdev->dev, "Unable to get IRQ resource\n"); |
b0848aea PK |
86 | goto put_hcd; |
87 | } | |
0c43e9d8 | 88 | hcd->irq = ret; |
b0848aea PK |
89 | |
90 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
bb304b71 II |
91 | if (!res) { |
92 | dev_err(&pdev->dev, "Unable to get memory resource\n"); | |
93 | ret = -ENODEV; | |
b0848aea PK |
94 | goto put_hcd; |
95 | } | |
bb304b71 | 96 | |
e507bf57 VB |
97 | hcd->rsrc_start = res->start; |
98 | hcd->rsrc_len = resource_size(res); | |
bb304b71 II |
99 | hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); |
100 | if (!hcd->regs) { | |
101 | dev_err(&pdev->dev, "ioremap failed\n"); | |
102 | ret = -ENOMEM; | |
103 | goto put_hcd; | |
104 | } | |
b0848aea PK |
105 | |
106 | /* | |
107 | * OTG driver takes care of PHY initialization, clock management, | |
8bb6a164 PK |
108 | * powering up VBUS, mapping of registers address space and power |
109 | * management. | |
b0848aea | 110 | */ |
0fc924bd II |
111 | if (pdev->dev.of_node) |
112 | phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0); | |
113 | else | |
114 | phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); | |
115 | ||
e299bd93 | 116 | if (IS_ERR(phy)) { |
b0848aea | 117 | dev_err(&pdev->dev, "unable to find transceiver\n"); |
0fc924bd | 118 | ret = -EPROBE_DEFER; |
df5eb3ff | 119 | goto put_hcd; |
b0848aea PK |
120 | } |
121 | ||
6e13c650 | 122 | ret = otg_set_host(phy->otg, &hcd->self); |
b0848aea PK |
123 | if (ret < 0) { |
124 | dev_err(&pdev->dev, "unable to register with transceiver\n"); | |
df5eb3ff | 125 | goto put_hcd; |
b0848aea PK |
126 | } |
127 | ||
3d46e73d | 128 | hcd->usb_phy = phy; |
b0848aea | 129 | device_init_wakeup(&pdev->dev, 1); |
8bb6a164 PK |
130 | /* |
131 | * OTG device parent of HCD takes care of putting | |
132 | * hardware into low power mode. | |
133 | */ | |
134 | pm_runtime_no_callbacks(&pdev->dev); | |
135 | pm_runtime_enable(&pdev->dev); | |
136 | ||
8c68e84f MG |
137 | /* FIXME: need to call usb_add_hcd() here? */ |
138 | ||
b0848aea PK |
139 | return 0; |
140 | ||
b0848aea PK |
141 | put_hcd: |
142 | usb_put_hcd(hcd); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
fb4e98ab | 147 | static int ehci_msm_remove(struct platform_device *pdev) |
b0848aea PK |
148 | { |
149 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
150 | ||
151 | device_init_wakeup(&pdev->dev, 0); | |
8bb6a164 PK |
152 | pm_runtime_disable(&pdev->dev); |
153 | pm_runtime_set_suspended(&pdev->dev); | |
b0848aea | 154 | |
3d46e73d | 155 | otg_set_host(hcd->usb_phy->otg, NULL); |
b0848aea | 156 | |
8c68e84f MG |
157 | /* FIXME: need to call usb_remove_hcd() here? */ |
158 | ||
b0848aea PK |
159 | usb_put_hcd(hcd); |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
8bb6a164 PK |
164 | #ifdef CONFIG_PM |
165 | static int ehci_msm_pm_suspend(struct device *dev) | |
166 | { | |
167 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
c5cf9212 | 168 | bool do_wakeup = device_may_wakeup(dev); |
8bb6a164 PK |
169 | |
170 | dev_dbg(dev, "ehci-msm PM suspend\n"); | |
171 | ||
c5cf9212 | 172 | return ehci_suspend(hcd, do_wakeup); |
8bb6a164 PK |
173 | } |
174 | ||
175 | static int ehci_msm_pm_resume(struct device *dev) | |
176 | { | |
177 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
178 | ||
179 | dev_dbg(dev, "ehci-msm PM resume\n"); | |
c5cf9212 | 180 | ehci_resume(hcd, false); |
8bb6a164 PK |
181 | |
182 | return 0; | |
183 | } | |
184 | #else | |
185 | #define ehci_msm_pm_suspend NULL | |
186 | #define ehci_msm_pm_resume NULL | |
187 | #endif | |
188 | ||
189 | static const struct dev_pm_ops ehci_msm_dev_pm_ops = { | |
190 | .suspend = ehci_msm_pm_suspend, | |
191 | .resume = ehci_msm_pm_resume, | |
192 | }; | |
193 | ||
3587fb3b | 194 | static const struct of_device_id msm_ehci_dt_match[] = { |
0fc924bd II |
195 | { .compatible = "qcom,ehci-host", }, |
196 | {} | |
197 | }; | |
198 | MODULE_DEVICE_TABLE(of, msm_ehci_dt_match); | |
199 | ||
b0848aea PK |
200 | static struct platform_driver ehci_msm_driver = { |
201 | .probe = ehci_msm_probe, | |
7690417d | 202 | .remove = ehci_msm_remove, |
b0848aea PK |
203 | .driver = { |
204 | .name = "msm_hsusb_host", | |
8bb6a164 | 205 | .pm = &ehci_msm_dev_pm_ops, |
0fc924bd | 206 | .of_match_table = msm_ehci_dt_match, |
b0848aea PK |
207 | }, |
208 | }; | |
8c68e84f MG |
209 | |
210 | static const struct ehci_driver_overrides msm_overrides __initdata = { | |
211 | .reset = ehci_msm_reset, | |
212 | }; | |
213 | ||
214 | static int __init ehci_msm_init(void) | |
215 | { | |
216 | if (usb_disabled()) | |
217 | return -ENODEV; | |
218 | ||
219 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
220 | ehci_init_driver(&msm_hc_driver, &msm_overrides); | |
221 | return platform_driver_register(&ehci_msm_driver); | |
222 | } | |
223 | module_init(ehci_msm_init); | |
224 | ||
225 | static void __exit ehci_msm_cleanup(void) | |
226 | { | |
227 | platform_driver_unregister(&ehci_msm_driver); | |
228 | } | |
229 | module_exit(ehci_msm_cleanup); | |
230 | ||
231 | MODULE_DESCRIPTION(DRIVER_DESC); | |
232 | MODULE_ALIAS("platform:msm-ehci"); | |
233 | MODULE_LICENSE("GPL"); |