1/*
  2 * SAMSUNG EXYNOS USB HOST OHCI Controller
  3 *
  4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
  5 * Author: Jingoo Han <jg1.han@samsung.com>
  6 *
  7 * This program is free software; you can redistribute  it and/or modify it
  8 * under  the terms of  the GNU General  Public License as published by the
  9 * Free Software Foundation;  either version 2 of the  License, or (at your
 10 * option) any later version.
 11 *
 12 */
 13
 14#include <linux/clk.h>
 15#include <linux/platform_device.h>
 16#include <mach/ohci.h>
 17#include <plat/usb-phy.h>
 18
 19struct exynos_ohci_hcd {
 20	struct device *dev;
 21	struct usb_hcd *hcd;
 22	struct clk *clk;
 23};
 24
 25static int ohci_exynos_start(struct usb_hcd *hcd)
 26{
 27	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 28	int ret;
 29
 30	ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
 31
 32	ret = ohci_init(ohci);
 33	if (ret < 0)
 34		return ret;
 35
 36	ret = ohci_run(ohci);
 37	if (ret < 0) {
 38		dev_err(hcd->self.controller, "can't start %s\n",
 39			hcd->self.bus_name);
 40		ohci_stop(hcd);
 41		return ret;
 42	}
 43
 44	return 0;
 45}
 46
 47static const struct hc_driver exynos_ohci_hc_driver = {
 48	.description		= hcd_name,
 49	.product_desc		= "EXYNOS OHCI Host Controller",
 50	.hcd_priv_size		= sizeof(struct ohci_hcd),
 51
 52	.irq			= ohci_irq,
 53	.flags			= HCD_MEMORY|HCD_USB11,
 54
 55	.start			= ohci_exynos_start,
 56	.stop			= ohci_stop,
 57	.shutdown		= ohci_shutdown,
 58
 59	.get_frame_number	= ohci_get_frame,
 60
 61	.urb_enqueue		= ohci_urb_enqueue,
 62	.urb_dequeue		= ohci_urb_dequeue,
 63	.endpoint_disable	= ohci_endpoint_disable,
 64
 65	.hub_status_data	= ohci_hub_status_data,
 66	.hub_control		= ohci_hub_control,
 67#ifdef	CONFIG_PM
 68	.bus_suspend		= ohci_bus_suspend,
 69	.bus_resume		= ohci_bus_resume,
 70#endif
 71	.start_port_reset	= ohci_start_port_reset,
 72};
 73
 74static int __devinit exynos_ohci_probe(struct platform_device *pdev)
 75{
 76	struct exynos4_ohci_platdata *pdata;
 77	struct exynos_ohci_hcd *exynos_ohci;
 78	struct usb_hcd *hcd;
 79	struct ohci_hcd *ohci;
 80	struct resource *res;
 81	int irq;
 82	int err;
 83
 84	pdata = pdev->dev.platform_data;
 85	if (!pdata) {
 86		dev_err(&pdev->dev, "No platform data defined\n");
 87		return -EINVAL;
 88	}
 89
 90	exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
 91	if (!exynos_ohci)
 92		return -ENOMEM;
 93
 94	exynos_ohci->dev = &pdev->dev;
 95
 96	hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
 97					dev_name(&pdev->dev));
 98	if (!hcd) {
 99		dev_err(&pdev->dev, "Unable to create HCD\n");
100		err = -ENOMEM;
101		goto fail_hcd;
102	}
103
104	exynos_ohci->hcd = hcd;
105	exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
106
107	if (IS_ERR(exynos_ohci->clk)) {
108		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
109		err = PTR_ERR(exynos_ohci->clk);
110		goto fail_clk;
111	}
112
113	err = clk_enable(exynos_ohci->clk);
114	if (err)
115		goto fail_clken;
116
117	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
118	if (!res) {
119		dev_err(&pdev->dev, "Failed to get I/O memory\n");
120		err = -ENXIO;
121		goto fail_io;
122	}
123
124	hcd->rsrc_start = res->start;
125	hcd->rsrc_len = resource_size(res);
126	hcd->regs = ioremap(res->start, resource_size(res));
127	if (!hcd->regs) {
128		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
129		err = -ENOMEM;
130		goto fail_io;
131	}
132
133	irq = platform_get_irq(pdev, 0);
134	if (!irq) {
135		dev_err(&pdev->dev, "Failed to get IRQ\n");
136		err = -ENODEV;
137		goto fail;
138	}
139
140	if (pdata->phy_init)
141		pdata->phy_init(pdev, S5P_USB_PHY_HOST);
142
143	ohci = hcd_to_ohci(hcd);
144	ohci_hcd_init(ohci);
145
146	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
147	if (err) {
148		dev_err(&pdev->dev, "Failed to add USB HCD\n");
149		goto fail;
150	}
151
152	platform_set_drvdata(pdev, exynos_ohci);
153
154	return 0;
155
156fail:
157	iounmap(hcd->regs);
158fail_io:
159	clk_disable(exynos_ohci->clk);
160fail_clken:
161	clk_put(exynos_ohci->clk);
162fail_clk:
163	usb_put_hcd(hcd);
164fail_hcd:
165	kfree(exynos_ohci);
166	return err;
167}
168
169static int __devexit exynos_ohci_remove(struct platform_device *pdev)
170{
171	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
172	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
173	struct usb_hcd *hcd = exynos_ohci->hcd;
174
175	usb_remove_hcd(hcd);
176
177	if (pdata && pdata->phy_exit)
178		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
179
180	iounmap(hcd->regs);
181
182	clk_disable(exynos_ohci->clk);
183	clk_put(exynos_ohci->clk);
184
185	usb_put_hcd(hcd);
186	kfree(exynos_ohci);
187
188	return 0;
189}
190
191static void exynos_ohci_shutdown(struct platform_device *pdev)
192{
193	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
194	struct usb_hcd *hcd = exynos_ohci->hcd;
195
196	if (hcd->driver->shutdown)
197		hcd->driver->shutdown(hcd);
198}
199
200#ifdef CONFIG_PM
201static int exynos_ohci_suspend(struct device *dev)
202{
203	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
204	struct usb_hcd *hcd = exynos_ohci->hcd;
205	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
206	struct platform_device *pdev = to_platform_device(dev);
207	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
208	unsigned long flags;
209	int rc = 0;
210
211	/*
212	 * Root hub was already suspended. Disable irq emission and
213	 * mark HW unaccessible, bail out if RH has been resumed. Use
214	 * the spinlock to properly synchronize with possible pending
215	 * RH suspend or resume activity.
216	 */
217	spin_lock_irqsave(&ohci->lock, flags);
218	if (ohci->rh_state != OHCI_RH_SUSPENDED &&
219			ohci->rh_state != OHCI_RH_HALTED) {
220		rc = -EINVAL;
221		goto fail;
222	}
223
224	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
225
226	if (pdata && pdata->phy_exit)
227		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
228fail:
229	spin_unlock_irqrestore(&ohci->lock, flags);
230
231	return rc;
232}
233
234static int exynos_ohci_resume(struct device *dev)
235{
236	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
237	struct usb_hcd *hcd = exynos_ohci->hcd;
238	struct platform_device *pdev = to_platform_device(dev);
239	struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
240
241	if (pdata && pdata->phy_init)
242		pdata->phy_init(pdev, S5P_USB_PHY_HOST);
243
244	/* Mark hardware accessible again as we are out of D3 state by now */
245	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
246
247	ohci_finish_controller_resume(hcd);
248
249	return 0;
250}
251#else
252#define exynos_ohci_suspend	NULL
253#define exynos_ohci_resume	NULL
254#endif
255
256static const struct dev_pm_ops exynos_ohci_pm_ops = {
257	.suspend	= exynos_ohci_suspend,
258	.resume		= exynos_ohci_resume,
259};
260
261static struct platform_driver exynos_ohci_driver = {
262	.probe		= exynos_ohci_probe,
263	.remove		= __devexit_p(exynos_ohci_remove),
264	.shutdown	= exynos_ohci_shutdown,
265	.driver = {
266		.name	= "exynos-ohci",
267		.owner	= THIS_MODULE,
268		.pm	= &exynos_ohci_pm_ops,
269	}
270};
271
272MODULE_ALIAS("platform:exynos-ohci");
273MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");