xref: /openbmc/linux/drivers/usb/chipidea/host.c (revision d2999e1b)
1 /*
2  * host.c - ChipIdea USB host controller driver
3  *
4  * Copyright (c) 2012 Intel Corporation
5  *
6  * Author: Alexander Shishkin
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21 
22 #include <linux/kernel.h>
23 #include <linux/io.h>
24 #include <linux/usb.h>
25 #include <linux/usb/hcd.h>
26 #include <linux/usb/chipidea.h>
27 #include <linux/regulator/consumer.h>
28 
29 #include "../host/ehci.h"
30 
31 #include "ci.h"
32 #include "bits.h"
33 #include "host.h"
34 
35 static struct hc_driver __read_mostly ci_ehci_hc_driver;
36 
37 static irqreturn_t host_irq(struct ci_hdrc *ci)
38 {
39 	return usb_hcd_irq(ci->irq, ci->hcd);
40 }
41 
42 static int host_start(struct ci_hdrc *ci)
43 {
44 	struct usb_hcd *hcd;
45 	struct ehci_hcd *ehci;
46 	int ret;
47 
48 	if (usb_disabled())
49 		return -ENODEV;
50 
51 	hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
52 	if (!hcd)
53 		return -ENOMEM;
54 
55 	dev_set_drvdata(ci->dev, ci);
56 	hcd->rsrc_start = ci->hw_bank.phys;
57 	hcd->rsrc_len = ci->hw_bank.size;
58 	hcd->regs = ci->hw_bank.abs;
59 	hcd->has_tt = 1;
60 
61 	hcd->power_budget = ci->platdata->power_budget;
62 	hcd->phy = ci->transceiver;
63 
64 	ehci = hcd_to_ehci(hcd);
65 	ehci->caps = ci->hw_bank.cap;
66 	ehci->has_hostpc = ci->hw_bank.lpm;
67 	ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
68 	ehci->imx28_write_fix = ci->imx28_write_fix;
69 
70 	/*
71 	 * vbus is always on if host is not in OTG FSM mode,
72 	 * otherwise should be controlled by OTG FSM
73 	 */
74 	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
75 		ret = regulator_enable(ci->platdata->reg_vbus);
76 		if (ret) {
77 			dev_err(ci->dev,
78 				"Failed to enable vbus regulator, ret=%d\n",
79 				ret);
80 			goto put_hcd;
81 		}
82 	}
83 
84 	ret = usb_add_hcd(hcd, 0, 0);
85 	if (ret) {
86 		goto disable_reg;
87 	} else {
88 		struct usb_otg *otg = ci->transceiver->otg;
89 
90 		ci->hcd = hcd;
91 		if (otg) {
92 			otg->host = &hcd->self;
93 			hcd->self.otg_port = 1;
94 		}
95 	}
96 
97 	if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
98 		hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
99 
100 	return ret;
101 
102 disable_reg:
103 	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
104 		regulator_disable(ci->platdata->reg_vbus);
105 
106 put_hcd:
107 	usb_put_hcd(hcd);
108 
109 	return ret;
110 }
111 
112 static void host_stop(struct ci_hdrc *ci)
113 {
114 	struct usb_hcd *hcd = ci->hcd;
115 
116 	if (hcd) {
117 		usb_remove_hcd(hcd);
118 		usb_put_hcd(hcd);
119 		if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
120 			regulator_disable(ci->platdata->reg_vbus);
121 	}
122 }
123 
124 
125 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
126 {
127 	if (ci->role == CI_ROLE_HOST && ci->hcd)
128 		host_stop(ci);
129 }
130 
131 int ci_hdrc_host_init(struct ci_hdrc *ci)
132 {
133 	struct ci_role_driver *rdrv;
134 
135 	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
136 		return -ENXIO;
137 
138 	rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
139 	if (!rdrv)
140 		return -ENOMEM;
141 
142 	rdrv->start	= host_start;
143 	rdrv->stop	= host_stop;
144 	rdrv->irq	= host_irq;
145 	rdrv->name	= "host";
146 	ci->roles[CI_ROLE_HOST] = rdrv;
147 
148 	ehci_init_driver(&ci_ehci_hc_driver, NULL);
149 
150 	return 0;
151 }
152