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	if (ci->platdata->reg_vbus) {
 71		ret = regulator_enable(ci->platdata->reg_vbus);
 72		if (ret) {
 73			dev_err(ci->dev,
 74				"Failed to enable vbus regulator, ret=%d\n",
 75				ret);
 76			goto put_hcd;
 77		}
 78	}
 79
 80	ret = usb_add_hcd(hcd, 0, 0);
 81	if (ret)
 82		goto disable_reg;
 83	else
 84		ci->hcd = hcd;
 85
 86	if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
 87		hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 88
 89	return ret;
 90
 91disable_reg:
 92	if (ci->platdata->reg_vbus)
 93		regulator_disable(ci->platdata->reg_vbus);
 94
 95put_hcd:
 96	usb_put_hcd(hcd);
 97
 98	return ret;
 99}
100
101static void host_stop(struct ci_hdrc *ci)
102{
103	struct usb_hcd *hcd = ci->hcd;
104
105	if (hcd) {
106		usb_remove_hcd(hcd);
107		usb_put_hcd(hcd);
108		if (ci->platdata->reg_vbus)
109			regulator_disable(ci->platdata->reg_vbus);
110	}
111}
112
113
114void ci_hdrc_host_destroy(struct ci_hdrc *ci)
115{
116	if (ci->role == CI_ROLE_HOST && ci->hcd)
117		host_stop(ci);
118}
119
120int ci_hdrc_host_init(struct ci_hdrc *ci)
121{
122	struct ci_role_driver *rdrv;
123
124	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
125		return -ENXIO;
126
127	rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
128	if (!rdrv)
129		return -ENOMEM;
130
131	rdrv->start	= host_start;
132	rdrv->stop	= host_stop;
133	rdrv->irq	= host_irq;
134	rdrv->name	= "host";
135	ci->roles[CI_ROLE_HOST] = rdrv;
136
137	ehci_init_driver(&ci_ehci_hc_driver, NULL);
138
139	return 0;
140}