ehci-msm.c 5.8 KB
Newer Older
1 2
/* ehci-msm.c - HSUSB Host Controller Driver Implementation
 *
3
 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 *
 * Partly derived from ehci-fsl.c and ehci-hcd.c
 * Copyright (c) 2000-2004 by David Brownell
 * Copyright (c) 2005 MontaVista Software
 *
 * All source code in this file is licensed under the following license except
 * where indicated.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can find it at http://www.fsf.org
 */

#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
28
#include <linux/pm_runtime.h>
29 30 31 32 33 34

#include <linux/usb/otg.h>
#include <linux/usb/msm_hsusb_hw.h>

#define MSM_USB_BASE (hcd->regs)

35
static struct usb_phy *phy;
36 37 38 39 40 41 42 43 44

static int ehci_msm_reset(struct usb_hcd *hcd)
{
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	int retval;

	ehci->caps = USB_CAPLENGTH;
	hcd->has_tt = 1;

M
Matthieu CASTET 已提交
45
	retval = ehci_setup(hcd);
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
	if (retval)
		return retval;

	/* bursts of unspecified length. */
	writel(0, USB_AHBBURST);
	/* Use the AHB transactor */
	writel(0, USB_AHBMODE);
	/* Disable streaming mode and select host mode */
	writel(0x13, USB_USBMODE);

	ehci_port_power(ehci, 1);
	return 0;
}

static struct hc_driver msm_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "Qualcomm On-Chip EHCI Host Controller",
	.hcd_priv_size		= sizeof(struct ehci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq			= ehci_irq,
	.flags			= HCD_USB2 | HCD_MEMORY,

	.reset			= ehci_msm_reset,
72
	.start			= ehci_run,
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144

	.stop			= ehci_stop,
	.shutdown		= ehci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue		= ehci_urb_enqueue,
	.urb_dequeue		= ehci_urb_dequeue,
	.endpoint_disable	= ehci_endpoint_disable,
	.endpoint_reset		= ehci_endpoint_reset,
	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,

	/*
	 * scheduling support
	 */
	.get_frame_number	= ehci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
	.relinquish_port	= ehci_relinquish_port,
	.port_handed_over	= ehci_port_handed_over,

	/*
	 * PM support
	 */
	.bus_suspend		= ehci_bus_suspend,
	.bus_resume		= ehci_bus_resume,
};

static int ehci_msm_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	dev_dbg(&pdev->dev, "ehci_msm proble\n");

	hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return  -ENOMEM;
	}

	hcd->irq = platform_get_irq(pdev, 0);
	if (hcd->irq < 0) {
		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
		ret = hcd->irq;
		goto put_hcd;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Unable to get memory resource\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto put_hcd;
	}

	/*
	 * OTG driver takes care of PHY initialization, clock management,
145 146
	 * powering up VBUS, mapping of registers address space and power
	 * management.
147
	 */
148 149
	phy = usb_get_transceiver();
	if (!phy) {
150 151 152 153 154
		dev_err(&pdev->dev, "unable to find transceiver\n");
		ret = -ENODEV;
		goto unmap;
	}

155
	ret = otg_set_host(phy, &hcd->self);
156 157 158 159 160 161
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to register with transceiver\n");
		goto put_transceiver;
	}

	device_init_wakeup(&pdev->dev, 1);
162 163 164 165 166 167 168
	/*
	 * OTG device parent of HCD takes care of putting
	 * hardware into low power mode.
	 */
	pm_runtime_no_callbacks(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

169 170 171
	return 0;

put_transceiver:
172
	usb_put_transceiver(phy);
173 174 175 176 177 178 179 180 181 182 183 184 185
unmap:
	iounmap(hcd->regs);
put_hcd:
	usb_put_hcd(hcd);

	return ret;
}

static int __devexit ehci_msm_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
186 187
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);
188

189 190
	otg_set_host(phy, NULL);
	usb_put_transceiver(phy);
191 192 193 194 195 196

	usb_put_hcd(hcd);

	return 0;
}

197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
#ifdef CONFIG_PM
static int ehci_msm_pm_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	bool wakeup = device_may_wakeup(dev);

	dev_dbg(dev, "ehci-msm PM suspend\n");

	/*
	 * EHCI helper function has also the same check before manipulating
	 * port wakeup flags.  We do check here the same condition before
	 * calling the same helper function to avoid bringing hardware
	 * from Low power mode when there is no need for adjusting port
	 * wakeup flags.
	 */
	if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
		pm_runtime_resume(dev);
		ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
				wakeup);
	}

	return 0;
}

static int ehci_msm_pm_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	dev_dbg(dev, "ehci-msm PM resume\n");
	ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));

	return 0;
}
#else
#define ehci_msm_pm_suspend	NULL
#define ehci_msm_pm_resume	NULL
#endif

static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
	.suspend         = ehci_msm_pm_suspend,
	.resume          = ehci_msm_pm_resume,
};

240 241 242 243 244
static struct platform_driver ehci_msm_driver = {
	.probe	= ehci_msm_probe,
	.remove	= __devexit_p(ehci_msm_remove),
	.driver = {
		   .name = "msm_hsusb_host",
245
		   .pm = &ehci_msm_dev_pm_ops,
246 247
	},
};