Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
35static struct hc_driver __read_mostly ci_ehci_hc_driver;
36
37static irqreturn_t host_irq(struct ci_hdrc *ci)
38{
39 return usb_hcd_irq(ci->irq, ci->hcd);
40}
41
42static 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
102disable_reg:
103 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci))
104 regulator_disable(ci->platdata->reg_vbus);
105
106put_hcd:
107 usb_put_hcd(hcd);
108
109 return ret;
110}
111
112static 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
125void ci_hdrc_host_destroy(struct ci_hdrc *ci)
126{
127 if (ci->role == CI_ROLE_HOST && ci->hcd)
128 host_stop(ci);
129}
130
131int 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}