1/*
  2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  3 *
  4 *  This program is free software; you can redistribute it and/or modify it
  5 *  under  the terms of the GNU General  Public License as published by the
  6 *  Free Software Foundation;  either version 2 of the License, or (at your
  7 *  option) any later version.
  8 *
  9 *  You should have received a copy of the  GNU General Public License along
 10 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 11 *  675 Mass Ave, Cambridge, MA 02139, USA.
 12 *
 13 */
 14
 15#include <linux/platform_device.h>
 16#include <linux/clk.h>
 17#include <linux/regulator/consumer.h>
 18
 19struct jz4740_ohci_hcd {
 20	struct ohci_hcd ohci_hcd;
 21
 22	struct regulator *vbus;
 23	bool vbus_enabled;
 24	struct clk *clk;
 25};
 26
 27static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
 28{
 29	return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
 30}
 31
 32static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
 33{
 34	return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
 35}
 36
 37static int ohci_jz4740_start(struct usb_hcd *hcd)
 38{
 39	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 40	int	ret;
 41
 42	ret = ohci_init(ohci);
 43	if (ret < 0)
 44		return ret;
 45
 46	ohci->num_ports = 1;
 47
 48	ret = ohci_run(ohci);
 49	if (ret < 0) {
 50		dev_err(hcd->self.controller, "Can not start %s",
 51			hcd->self.bus_name);
 52		ohci_stop(hcd);
 53		return ret;
 54	}
 55	return 0;
 56}
 57
 58static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
 59	bool enabled)
 60{
 61	int ret = 0;
 62
 63	if (!jz4740_ohci->vbus)
 64		return 0;
 65
 66	if (enabled && !jz4740_ohci->vbus_enabled) {
 67		ret = regulator_enable(jz4740_ohci->vbus);
 68		if (ret)
 69			dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
 70				"Could not power vbus\n");
 71	} else if (!enabled && jz4740_ohci->vbus_enabled) {
 72		ret = regulator_disable(jz4740_ohci->vbus);
 73	}
 74
 75	if (ret == 0)
 76		jz4740_ohci->vbus_enabled = enabled;
 77
 78	return ret;
 79}
 80
 81static int ohci_jz4740_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 82	u16 wIndex, char *buf, u16 wLength)
 83{
 84	struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
 85	int ret = 0;
 86
 87	switch (typeReq) {
 88	case SetPortFeature:
 89		if (wValue == USB_PORT_FEAT_POWER)
 90			ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
 91		break;
 92	case ClearPortFeature:
 93		if (wValue == USB_PORT_FEAT_POWER)
 94			ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
 95		break;
 96	}
 97
 98	if (ret)
 99		return ret;
100
101	return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
102}
103
104
105static const struct hc_driver ohci_jz4740_hc_driver = {
106	.description =		hcd_name,
107	.product_desc =		"JZ4740 OHCI",
108	.hcd_priv_size =	sizeof(struct jz4740_ohci_hcd),
109
110	/*
111	 * generic hardware linkage
112	 */
113	.irq =			ohci_irq,
114	.flags =		HCD_USB11 | HCD_MEMORY,
115
116	/*
117	 * basic lifecycle operations
118	 */
119	.start =		ohci_jz4740_start,
120	.stop =			ohci_stop,
121	.shutdown =		ohci_shutdown,
122
123	/*
124	 * managing i/o requests and associated device resources
125	 */
126	.urb_enqueue =		ohci_urb_enqueue,
127	.urb_dequeue =		ohci_urb_dequeue,
128	.endpoint_disable =	ohci_endpoint_disable,
129
130	/*
131	 * scheduling support
132	 */
133	.get_frame_number =	ohci_get_frame,
134
135	/*
136	 * root hub support
137	 */
138	.hub_status_data =	ohci_hub_status_data,
139	.hub_control =		ohci_jz4740_hub_control,
140#ifdef	CONFIG_PM
141	.bus_suspend =		ohci_bus_suspend,
142	.bus_resume =		ohci_bus_resume,
143#endif
144	.start_port_reset =	ohci_start_port_reset,
145};
146
147
148static int jz4740_ohci_probe(struct platform_device *pdev)
149{
150	int ret;
151	struct usb_hcd *hcd;
152	struct jz4740_ohci_hcd *jz4740_ohci;
153	struct resource *res;
154	int irq;
155
156	irq = platform_get_irq(pdev, 0);
157	if (irq < 0) {
158		dev_err(&pdev->dev, "Failed to get platform irq\n");
159		return irq;
160	}
161
162	hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
163	if (!hcd) {
164		dev_err(&pdev->dev, "Failed to create hcd.\n");
165		return -ENOMEM;
166	}
167
168	jz4740_ohci = hcd_to_jz4740_hcd(hcd);
169
170	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
171	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
172	if (IS_ERR(hcd->regs)) {
173		ret = PTR_ERR(hcd->regs);
174		goto err_free;
175	}
176	hcd->rsrc_start = res->start;
177	hcd->rsrc_len = resource_size(res);
178
179	jz4740_ohci->clk = devm_clk_get(&pdev->dev, "uhc");
180	if (IS_ERR(jz4740_ohci->clk)) {
181		ret = PTR_ERR(jz4740_ohci->clk);
182		dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
183		goto err_free;
184	}
185
186	jz4740_ohci->vbus = devm_regulator_get(&pdev->dev, "vbus");
187	if (IS_ERR(jz4740_ohci->vbus))
188		jz4740_ohci->vbus = NULL;
189
190
191	clk_set_rate(jz4740_ohci->clk, 48000000);
192	clk_enable(jz4740_ohci->clk);
193	if (jz4740_ohci->vbus)
194		ohci_jz4740_set_vbus_power(jz4740_ohci, true);
195
196	platform_set_drvdata(pdev, hcd);
197
198	ohci_hcd_init(hcd_to_ohci(hcd));
199
200	ret = usb_add_hcd(hcd, irq, 0);
201	if (ret) {
202		dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
203		goto err_disable;
204	}
205	device_wakeup_enable(hcd->self.controller);
206
207	return 0;
208
209err_disable:
210	if (jz4740_ohci->vbus)
211		regulator_disable(jz4740_ohci->vbus);
212	clk_disable(jz4740_ohci->clk);
213
214err_free:
215	usb_put_hcd(hcd);
216
217	return ret;
218}
219
220static int jz4740_ohci_remove(struct platform_device *pdev)
221{
222	struct usb_hcd *hcd = platform_get_drvdata(pdev);
223	struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
224
225	usb_remove_hcd(hcd);
226
227	if (jz4740_ohci->vbus)
228		regulator_disable(jz4740_ohci->vbus);
229
230	clk_disable(jz4740_ohci->clk);
231
232	usb_put_hcd(hcd);
233
234	return 0;
235}
236
237static struct platform_driver ohci_hcd_jz4740_driver = {
238	.probe = jz4740_ohci_probe,
239	.remove = jz4740_ohci_remove,
240	.driver = {
241		.name = "jz4740-ohci",
242	},
243};
244
245MODULE_ALIAS("platform:jz4740-ohci");