blob: ead59f42e69b10e75be28c14a2186573d0723fdd [file] [log] [blame]
Daniel Mack7e8d5cd2009-10-28 01:14:59 +01001/*
2 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
3 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/platform_device.h>
21#include <linux/clk.h>
22#include <linux/delay.h>
23#include <linux/usb/otg.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Daniel Mack7e8d5cd2009-10-28 01:14:59 +010025
26#include <mach/mxc_ehci.h>
27
28#define ULPI_VIEWPORT_OFFSET 0x170
29#define PORTSC_OFFSET 0x184
30#define USBMODE_OFFSET 0x1a8
31#define USBMODE_CM_HOST 3
32
33struct ehci_mxc_priv {
34 struct clk *usbclk, *ahbclk;
35 struct usb_hcd *hcd;
36};
37
38/* called during probe() after chip reset completes */
39static int ehci_mxc_setup(struct usb_hcd *hcd)
40{
41 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
42 int retval;
43
44 /* EHCI registers start at offset 0x100 */
45 ehci->caps = hcd->regs + 0x100;
46 ehci->regs = hcd->regs + 0x100 +
47 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
48 dbg_hcs_params(ehci, "reset");
49 dbg_hcc_params(ehci, "reset");
50
51 /* cache this readonly data; minimize chip reads */
52 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
53
54 retval = ehci_halt(ehci);
55 if (retval)
56 return retval;
57
58 /* data structure init */
59 retval = ehci_init(hcd);
60 if (retval)
61 return retval;
62
63 hcd->has_tt = 1;
64
65 ehci->sbrn = 0x20;
66
67 ehci_reset(ehci);
68
69 ehci_port_power(ehci, 0);
70 return 0;
71}
72
73static const struct hc_driver ehci_mxc_hc_driver = {
74 .description = hcd_name,
75 .product_desc = "Freescale On-Chip EHCI Host Controller",
76 .hcd_priv_size = sizeof(struct ehci_hcd),
77
78 /*
79 * generic hardware linkage
80 */
81 .irq = ehci_irq,
82 .flags = HCD_USB2 | HCD_MEMORY,
83
84 /*
85 * basic lifecycle operations
86 */
87 .reset = ehci_mxc_setup,
88 .start = ehci_run,
89 .stop = ehci_stop,
90 .shutdown = ehci_shutdown,
91
92 /*
93 * managing i/o requests and associated device resources
94 */
95 .urb_enqueue = ehci_urb_enqueue,
96 .urb_dequeue = ehci_urb_dequeue,
97 .endpoint_disable = ehci_endpoint_disable,
98
99 /*
100 * scheduling support
101 */
102 .get_frame_number = ehci_get_frame,
103
104 /*
105 * root hub support
106 */
107 .hub_status_data = ehci_hub_status_data,
108 .hub_control = ehci_hub_control,
109 .bus_suspend = ehci_bus_suspend,
110 .bus_resume = ehci_bus_resume,
111 .relinquish_port = ehci_relinquish_port,
112 .port_handed_over = ehci_port_handed_over,
113};
114
115static int ehci_mxc_drv_probe(struct platform_device *pdev)
116{
117 struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
118 struct usb_hcd *hcd;
119 struct resource *res;
120 int irq, ret, temp;
121 struct ehci_mxc_priv *priv;
122 struct device *dev = &pdev->dev;
123
124 dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
125
126 if (!pdata) {
127 dev_err(dev, "No platform data given, bailing out.\n");
128 return -EINVAL;
129 }
130
131 irq = platform_get_irq(pdev, 0);
132
133 hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
134 if (!hcd)
135 return -ENOMEM;
136
137 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
138 if (!priv) {
139 ret = -ENOMEM;
140 goto err_alloc;
141 }
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 dev_err(dev, "Found HC with no register addr. Check setup!\n");
146 ret = -ENODEV;
147 goto err_get_resource;
148 }
149
150 hcd->rsrc_start = res->start;
151 hcd->rsrc_len = resource_size(res);
152
153 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
154 dev_dbg(dev, "controller already in use\n");
155 ret = -EBUSY;
156 goto err_request_mem;
157 }
158
159 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
160 if (!hcd->regs) {
161 dev_err(dev, "error mapping memory\n");
162 ret = -EFAULT;
163 goto err_ioremap;
164 }
165
Valentin Longchamp2f0e40a2010-01-20 19:43:23 +0100166 /* call platform specific init function */
167 if (pdata->init) {
168 ret = pdata->init(pdev);
169 if (ret) {
170 dev_err(dev, "platform init failed\n");
171 goto err_init;
172 }
173 /* platforms need some time to settle changed IO settings */
174 mdelay(10);
175 }
176
Daniel Mack7e8d5cd2009-10-28 01:14:59 +0100177 /* enable clocks */
178 priv->usbclk = clk_get(dev, "usb");
179 if (IS_ERR(priv->usbclk)) {
180 ret = PTR_ERR(priv->usbclk);
181 goto err_clk;
182 }
183 clk_enable(priv->usbclk);
184
185 if (!cpu_is_mx35()) {
186 priv->ahbclk = clk_get(dev, "usb_ahb");
187 if (IS_ERR(priv->ahbclk)) {
188 ret = PTR_ERR(priv->ahbclk);
189 goto err_clk_ahb;
190 }
191 clk_enable(priv->ahbclk);
192 }
193
194 /* set USBMODE to host mode */
195 temp = readl(hcd->regs + USBMODE_OFFSET);
196 writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
197
198 /* set up the PORTSCx register */
199 writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
200 mdelay(10);
201
202 /* setup USBCONTROL. */
203 ret = mxc_set_usbcontrol(pdev->id, pdata->flags);
204 if (ret < 0)
205 goto err_init;
206
Daniel Mack7e8d5cd2009-10-28 01:14:59 +0100207 /* Initialize the transceiver */
208 if (pdata->otg) {
209 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
210 if (otg_init(pdata->otg) != 0)
211 dev_err(dev, "unable to init transceiver\n");
212 else if (otg_set_vbus(pdata->otg, 1) != 0)
213 dev_err(dev, "unable to enable vbus on transceiver\n");
214 }
215
216 priv->hcd = hcd;
217 platform_set_drvdata(pdev, priv);
218
219 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
220 if (ret)
221 goto err_add;
222
223 return 0;
224
225err_add:
226 if (pdata && pdata->exit)
227 pdata->exit(pdev);
228err_init:
229 if (priv->ahbclk) {
230 clk_disable(priv->ahbclk);
231 clk_put(priv->ahbclk);
232 }
233err_clk_ahb:
234 clk_disable(priv->usbclk);
235 clk_put(priv->usbclk);
236err_clk:
237 iounmap(hcd->regs);
238err_ioremap:
239 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
240err_request_mem:
241err_get_resource:
242 kfree(priv);
243err_alloc:
244 usb_put_hcd(hcd);
245 return ret;
246}
247
248static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
249{
250 struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
251 struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
252 struct usb_hcd *hcd = priv->hcd;
253
254 if (pdata && pdata->exit)
255 pdata->exit(pdev);
256
257 if (pdata->otg)
258 otg_shutdown(pdata->otg);
259
260 usb_remove_hcd(hcd);
261 iounmap(hcd->regs);
262 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
263 usb_put_hcd(hcd);
264 platform_set_drvdata(pdev, NULL);
265
266 clk_disable(priv->usbclk);
267 clk_put(priv->usbclk);
268 if (priv->ahbclk) {
269 clk_disable(priv->ahbclk);
270 clk_put(priv->ahbclk);
271 }
272
273 kfree(priv);
274
275 return 0;
276}
277
278static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
279{
280 struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
281 struct usb_hcd *hcd = priv->hcd;
282
283 if (hcd->driver->shutdown)
284 hcd->driver->shutdown(hcd);
285}
286
287MODULE_ALIAS("platform:mxc-ehci");
288
289static struct platform_driver ehci_mxc_driver = {
290 .probe = ehci_mxc_drv_probe,
291 .remove = __exit_p(ehci_mxc_drv_remove),
292 .shutdown = ehci_mxc_drv_shutdown,
293 .driver = {
294 .name = "mxc-ehci",
295 },
296};