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
host_irq(struct ci_hdrc * ci)37 static irqreturn_t host_irq(struct ci_hdrc *ci)
38 {
39 return usb_hcd_irq(ci->irq, ci->hcd);
40 }
41
host_start(struct ci_hdrc * ci)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->usb_phy = ci->transceiver;
63 hcd->tpl_support = ci->platdata->tpl_support;
64
65 ehci = hcd_to_ehci(hcd);
66 ehci->caps = ci->hw_bank.cap;
67 ehci->has_hostpc = ci->hw_bank.lpm;
68 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
69 ehci->imx28_write_fix = ci->imx28_write_fix;
70
71 /*
72 * vbus is always on if host is not in OTG FSM mode,
73 * otherwise should be controlled by OTG FSM
74 */
75 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
76 ret = regulator_enable(ci->platdata->reg_vbus);
77 if (ret) {
78 dev_err(ci->dev,
79 "Failed to enable vbus regulator, ret=%d\n",
80 ret);
81 goto put_hcd;
82 }
83 }
84
85 ret = usb_add_hcd(hcd, 0, 0);
86 if (ret) {
87 goto disable_reg;
88 } else {
89 struct usb_otg *otg = ci->transceiver->otg;
90
91 ci->hcd = hcd;
92 if (otg) {
93 otg->host = &hcd->self;
94 hcd->self.otg_port = 1;
95 }
96 }
97
98 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
99 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
100
101 return ret;
102
103 disable_reg:
104 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
105 regulator_disable(ci->platdata->reg_vbus);
106
107 put_hcd:
108 usb_put_hcd(hcd);
109
110 return ret;
111 }
112
host_stop(struct ci_hdrc * ci)113 static void host_stop(struct ci_hdrc *ci)
114 {
115 struct usb_hcd *hcd = ci->hcd;
116
117 if (hcd) {
118 usb_remove_hcd(hcd);
119 usb_put_hcd(hcd);
120 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
121 regulator_disable(ci->platdata->reg_vbus);
122 }
123 }
124
125
ci_hdrc_host_destroy(struct ci_hdrc * ci)126 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
127 {
128 if (ci->role == CI_ROLE_HOST && ci->hcd)
129 host_stop(ci);
130 }
131
ci_hdrc_host_init(struct ci_hdrc * ci)132 int ci_hdrc_host_init(struct ci_hdrc *ci)
133 {
134 struct ci_role_driver *rdrv;
135
136 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
137 return -ENXIO;
138
139 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
140 if (!rdrv)
141 return -ENOMEM;
142
143 rdrv->start = host_start;
144 rdrv->stop = host_stop;
145 rdrv->irq = host_irq;
146 rdrv->name = "host";
147 ci->roles[CI_ROLE_HOST] = rdrv;
148
149 ehci_init_driver(&ci_ehci_hc_driver, NULL);
150
151 return 0;
152 }
153