summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-atmel.c
blob: 8b775e7bab066541f192f658ee81c57b53997829 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
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
72
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for EHCI UHP on Atmel chips
 *
 *  Copyright (C) 2009 Atmel Corporation,
 *                     Nicolas Ferre <nicolas.ferre@atmel.com>
 *
 *  Based on various ehci-*.c drivers
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/phy.h>
#include <linux/usb/of.h>

#include "ehci.h"

#define DRIVER_DESC "EHCI Atmel driver"

#define EHCI_INSNREG(index)			((index) * 4 + 0x90)
#define EHCI_INSNREG08_HSIC_EN			BIT(2)

/* interface and function clocks */
#define hcd_to_atmel_ehci_priv(h) \
	((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv)

struct atmel_ehci_priv {
	struct clk *iclk;
	struct clk *uclk;
	bool clocked;
};

static struct hc_driver __read_mostly ehci_atmel_hc_driver;

static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = {
	.extra_priv_size = sizeof(struct atmel_ehci_priv),
};

/*-------------------------------------------------------------------------*/

static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci)
{
	if (atmel_ehci->clocked)
		return;

	clk_prepare_enable(atmel_ehci->uclk);
	clk_prepare_enable(atmel_ehci->iclk);
	atmel_ehci->clocked = true;
}

static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci)
{
	if (!atmel_ehci->clocked)
		return;

	clk_disable_unprepare(atmel_ehci->iclk);
	clk_disable_unprepare(atmel_ehci->uclk);
	atmel_ehci->clocked = false;
}

static void atmel_start_ehci(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);

	dev_dbg(&pdev->dev, "start\n");
	atmel_start_clock(atmel_ehci);
}

static void atmel_stop_ehci(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);

	dev_dbg(&pdev->dev, "stop\n");
	atmel_stop_clock(atmel_ehci);
}

/*-------------------------------------------------------------------------*/

static int ehci_atmel_drv_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	const struct hc_driver *driver = &ehci_atmel_hc_driver;
	struct resource *res;
	struct ehci_hcd *ehci;
	struct atmel_ehci_priv *atmel_ehci;
	int irq;
	int retval;

	if (usb_disabled())
		return -ENODEV;

	pr_debug("Initializing Atmel-SoC USB Host Controller\n");

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		retval = -ENODEV;
		goto fail_create_hcd;
	}

	/* Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we have dma capability bindings this can go away.
	 */
	retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (retval)
		goto fail_create_hcd;

	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		retval = -ENOMEM;
		goto fail_create_hcd;
	}
	atmel_ehci = hcd_to_atmel_ehci_priv(hcd);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		retval = PTR_ERR(hcd->regs);
		goto fail_request_resource;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk");
	if (IS_ERR(atmel_ehci->iclk)) {
		dev_err(&pdev->dev, "Error getting interface clock\n");
		retval = -ENOENT;
		goto fail_request_resource;
	}

	atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk");
	if (IS_ERR(atmel_ehci->uclk)) {
		dev_err(&pdev->dev, "failed to get uclk\n");
		retval = PTR_ERR(atmel_ehci->uclk);
		goto fail_request_resource;
	}

	ehci = hcd_to_ehci(hcd);
	/* registers start at offset 0x0 */
	ehci->caps = hcd->regs;

	atmel_start_ehci(pdev);

	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (retval)
		goto fail_add_hcd;
	device_wakeup_enable(hcd->self.controller);

	if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC)
		writel(EHCI_INSNREG08_HSIC_EN, hcd->regs + EHCI_INSNREG(8));

	return retval;

fail_add_hcd:
	atmel_stop_ehci(pdev);
fail_request_resource:
	usb_put_hcd(hcd);
fail_create_hcd:
	dev_err(&pdev->dev, "init %s fail, %d\n",
		dev_name(&pdev->dev), retval);

	return retval;
}

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

	usb_remove_hcd(hcd);
	usb_put_hcd(hcd);

	atmel_stop_ehci(pdev);

	return 0;
}

static int __maybe_unused ehci_atmel_drv_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);
	int ret;

	ret = ehci_suspend(hcd, false);
	if (ret)
		return ret;

	atmel_stop_clock(atmel_ehci);
	return 0;
}

static int __maybe_unused ehci_atmel_drv_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd);

	atmel_start_clock(atmel_ehci);
	ehci_resume(hcd, false);
	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id atmel_ehci_dt_ids[] = {
	{ .compatible = "atmel,at91sam9g45-ehci" },
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
#endif

static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend,
					ehci_atmel_drv_resume);

static struct platform_driver ehci_atmel_driver = {
	.probe		= ehci_atmel_drv_probe,
	.remove		= ehci_atmel_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.name	= "atmel-ehci",
		.pm	= &ehci_atmel_pm_ops,
		.of_match_table	= of_match_ptr(atmel_ehci_dt_ids),
	},
};

static int __init ehci_atmel_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	ehci_init_driver(&ehci_atmel_hc_driver, &ehci_atmel_drv_overrides);
	return platform_driver_register(&ehci_atmel_driver);
}
module_init(ehci_atmel_init);

static void __exit ehci_atmel_cleanup(void)
{
	platform_driver_unregister(&ehci_atmel_driver);
}
module_exit(ehci_atmel_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:atmel-ehci");
MODULE_AUTHOR("Nicolas Ferre");
MODULE_LICENSE("GPL");