blob: be0964a801e819fd5dbf88bcee3c1f12f14fd039 [file] [log] [blame]
Nicolas Ferre501c9c02009-07-27 14:47:40 -07001/*
2 * Driver for EHCI UHP on Atmel chips
3 *
4 * Copyright (C) 2009 Atmel Corporation,
5 * Nicolas Ferre <nicolas.ferre@atmel.com>
6 *
7 * Based on various ehci-*.c drivers
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13
14#include <linux/clk.h>
Manjunath Goudar97736962013-04-02 18:24:02 +020015#include <linux/dma-mapping.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
Nicolas Ferre94753752012-03-27 18:23:31 +020019#include <linux/of.h>
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +080020#include <linux/of_platform.h>
Manjunath Goudar97736962013-04-02 18:24:02 +020021#include <linux/platform_device.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include "ehci.h"
26
27#define DRIVER_DESC "EHCI Atmel driver"
28
29static const char hcd_name[] = "ehci-atmel";
Nicolas Ferre501c9c02009-07-27 14:47:40 -070030
31/* interface and function clocks */
Sylvain Rochet7baddac2015-01-20 14:39:01 +010032#define hcd_to_atmel_ehci_priv(h) \
33 ((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv)
34
35struct atmel_ehci_priv {
36 struct clk *iclk;
Sylvain Rochet7baddac2015-01-20 14:39:01 +010037 struct clk *uclk;
38 bool clocked;
39};
40
41static struct hc_driver __read_mostly ehci_atmel_hc_driver;
42
43static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = {
44 .extra_priv_size = sizeof(struct atmel_ehci_priv),
45};
Nicolas Ferre501c9c02009-07-27 14:47:40 -070046
47/*-------------------------------------------------------------------------*/
48
Sylvain Rochet7baddac2015-01-20 14:39:01 +010049static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci)
Nicolas Ferre501c9c02009-07-27 14:47:40 -070050{
Sylvain Rochet7baddac2015-01-20 14:39:01 +010051 if (atmel_ehci->clocked)
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +010052 return;
Boris Brezillone32643a2015-03-17 17:15:46 +010053
54 clk_prepare_enable(atmel_ehci->uclk);
Sylvain Rochet7baddac2015-01-20 14:39:01 +010055 clk_prepare_enable(atmel_ehci->iclk);
Sylvain Rochet7baddac2015-01-20 14:39:01 +010056 atmel_ehci->clocked = true;
Nicolas Ferre501c9c02009-07-27 14:47:40 -070057}
58
Sylvain Rochet7baddac2015-01-20 14:39:01 +010059static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci)
Nicolas Ferre501c9c02009-07-27 14:47:40 -070060{
Sylvain Rochet7baddac2015-01-20 14:39:01 +010061 if (!atmel_ehci->clocked)
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +010062 return;
Boris Brezillone32643a2015-03-17 17:15:46 +010063
Sylvain Rochet7baddac2015-01-20 14:39:01 +010064 clk_disable_unprepare(atmel_ehci->iclk);
Boris Brezillone32643a2015-03-17 17:15:46 +010065 clk_disable_unprepare(atmel_ehci->uclk);
Sylvain Rochet7baddac2015-01-20 14:39:01 +010066 atmel_ehci->clocked = false;
Nicolas Ferre501c9c02009-07-27 14:47:40 -070067}
68
69static void atmel_start_ehci(struct platform_device *pdev)
70{
Sylvain Rochet7baddac2015-01-20 14:39:01 +010071 struct usb_hcd *hcd = platform_get_drvdata(pdev);
72 struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
73
Nicolas Ferre501c9c02009-07-27 14:47:40 -070074 dev_dbg(&pdev->dev, "start\n");
Sylvain Rochet7baddac2015-01-20 14:39:01 +010075 atmel_start_clock(atmel_ehci);
Nicolas Ferre501c9c02009-07-27 14:47:40 -070076}
77
78static void atmel_stop_ehci(struct platform_device *pdev)
79{
Sylvain Rochet7baddac2015-01-20 14:39:01 +010080 struct usb_hcd *hcd = platform_get_drvdata(pdev);
81 struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
82
Nicolas Ferre501c9c02009-07-27 14:47:40 -070083 dev_dbg(&pdev->dev, "stop\n");
Sylvain Rochet7baddac2015-01-20 14:39:01 +010084 atmel_stop_clock(atmel_ehci);
Nicolas Ferre501c9c02009-07-27 14:47:40 -070085}
86
87/*-------------------------------------------------------------------------*/
88
Bill Pemberton41ac7b32012-11-19 13:21:48 -050089static int ehci_atmel_drv_probe(struct platform_device *pdev)
Nicolas Ferre501c9c02009-07-27 14:47:40 -070090{
91 struct usb_hcd *hcd;
92 const struct hc_driver *driver = &ehci_atmel_hc_driver;
93 struct resource *res;
Manjunath Goudar97736962013-04-02 18:24:02 +020094 struct ehci_hcd *ehci;
Sylvain Rochet7baddac2015-01-20 14:39:01 +010095 struct atmel_ehci_priv *atmel_ehci;
Nicolas Ferre501c9c02009-07-27 14:47:40 -070096 int irq;
97 int retval;
98
99 if (usb_disabled())
100 return -ENODEV;
101
102 pr_debug("Initializing Atmel-SoC USB Host Controller\n");
103
104 irq = platform_get_irq(pdev, 0);
105 if (irq <= 0) {
106 dev_err(&pdev->dev,
107 "Found HC with no IRQ. Check %s setup!\n",
108 dev_name(&pdev->dev));
109 retval = -ENODEV;
110 goto fail_create_hcd;
111 }
112
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +0800113 /* Right now device-tree probed devices don't get dma_mask set.
114 * Since shared usb code relies on it, set it here for now.
115 * Once we have dma capability bindings this can go away.
116 */
Russell Kinge1fd7342013-06-27 12:36:37 +0100117 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
Russell King22d9d8e2013-06-10 16:28:49 +0100118 if (retval)
119 goto fail_create_hcd;
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +0800120
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700121 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
122 if (!hcd) {
123 retval = -ENOMEM;
124 goto fail_create_hcd;
125 }
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100126 atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700127
128 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Thierry Reding148e1132013-01-21 11:09:22 +0100129 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
130 if (IS_ERR(hcd->regs)) {
131 retval = PTR_ERR(hcd->regs);
Julia Lawall97983432012-07-29 21:46:05 +0200132 goto fail_request_resource;
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700133 }
134
Varka Bhadram0fb5f702014-11-04 07:51:08 +0530135 hcd->rsrc_start = res->start;
136 hcd->rsrc_len = resource_size(res);
137
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100138 atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk");
139 if (IS_ERR(atmel_ehci->iclk)) {
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700140 dev_err(&pdev->dev, "Error getting interface clock\n");
141 retval = -ENOENT;
Julia Lawall97983432012-07-29 21:46:05 +0200142 goto fail_request_resource;
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700143 }
Boris Brezillone32643a2015-03-17 17:15:46 +0100144
145 atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk");
146 if (IS_ERR(atmel_ehci->uclk)) {
147 dev_err(&pdev->dev, "failed to get uclk\n");
148 retval = PTR_ERR(atmel_ehci->uclk);
Julia Lawall97983432012-07-29 21:46:05 +0200149 goto fail_request_resource;
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700150 }
151
Manjunath Goudar97736962013-04-02 18:24:02 +0200152 ehci = hcd_to_ehci(hcd);
153 /* registers start at offset 0x0 */
154 ehci->caps = hcd->regs;
155
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700156 atmel_start_ehci(pdev);
157
158 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
159 if (retval)
160 goto fail_add_hcd;
Peter Chen3c9740a2013-11-05 10:46:02 +0800161 device_wakeup_enable(hcd->self.controller);
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700162
163 return retval;
164
165fail_add_hcd:
166 atmel_stop_ehci(pdev);
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700167fail_request_resource:
168 usb_put_hcd(hcd);
169fail_create_hcd:
170 dev_err(&pdev->dev, "init %s fail, %d\n",
171 dev_name(&pdev->dev), retval);
172
173 return retval;
174}
175
Bill Pembertonfb4e98a2012-11-19 13:26:20 -0500176static int ehci_atmel_drv_remove(struct platform_device *pdev)
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700177{
178 struct usb_hcd *hcd = platform_get_drvdata(pdev);
179
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700180 usb_remove_hcd(hcd);
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700181 usb_put_hcd(hcd);
182
183 atmel_stop_ehci(pdev);
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700184
185 return 0;
186}
187
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100188#ifdef CONFIG_PM
189static int ehci_atmel_drv_suspend(struct device *dev)
190{
191 struct usb_hcd *hcd = dev_get_drvdata(dev);
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100192 struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100193 int ret;
194
195 ret = ehci_suspend(hcd, false);
196 if (ret)
197 return ret;
198
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100199 atmel_stop_clock(atmel_ehci);
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100200 return 0;
201}
202
203static int ehci_atmel_drv_resume(struct device *dev)
204{
205 struct usb_hcd *hcd = dev_get_drvdata(dev);
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100206 struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100207
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100208 atmel_start_clock(atmel_ehci);
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100209 return ehci_resume(hcd, false);
210}
211#endif
212
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +0800213#ifdef CONFIG_OF
214static const struct of_device_id atmel_ehci_dt_ids[] = {
215 { .compatible = "atmel,at91sam9g45-ehci" },
216 { /* sentinel */ }
217};
218
219MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
220#endif
221
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100222static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend,
223 ehci_atmel_drv_resume);
224
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700225static struct platform_driver ehci_atmel_driver = {
226 .probe = ehci_atmel_drv_probe,
Bill Pemberton76904172012-11-19 13:21:08 -0500227 .remove = ehci_atmel_drv_remove,
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700228 .shutdown = usb_hcd_platform_shutdown,
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +0800229 .driver = {
230 .name = "atmel-ehci",
Sylvain Rochetca2c1dc2015-01-20 14:38:59 +0100231 .pm = &ehci_atmel_pm_ops,
Jean-Christophe PLAGNIOL-VILLARD9d843002011-11-22 12:11:13 +0800232 .of_match_table = of_match_ptr(atmel_ehci_dt_ids),
233 },
Nicolas Ferre501c9c02009-07-27 14:47:40 -0700234};
Manjunath Goudar97736962013-04-02 18:24:02 +0200235
236static int __init ehci_atmel_init(void)
237{
238 if (usb_disabled())
239 return -ENODEV;
240
241 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
Sylvain Rochet7baddac2015-01-20 14:39:01 +0100242 ehci_init_driver(&ehci_atmel_hc_driver, &ehci_atmel_drv_overrides);
Manjunath Goudar97736962013-04-02 18:24:02 +0200243 return platform_driver_register(&ehci_atmel_driver);
244}
245module_init(ehci_atmel_init);
246
247static void __exit ehci_atmel_cleanup(void)
248{
249 platform_driver_unregister(&ehci_atmel_driver);
250}
251module_exit(ehci_atmel_cleanup);
252
253MODULE_DESCRIPTION(DRIVER_DESC);
254MODULE_ALIAS("platform:atmel-ehci");
255MODULE_AUTHOR("Nicolas Ferre");
256MODULE_LICENSE("GPL");