summaryrefslogtreecommitdiff
path: root/drivers/usb/musb/jz4740.c
blob: d1e4e0deb7535f6ccb153c602c9f3760b65f6241 (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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
// SPDX-License-Identifier: GPL-2.0+
/*
 * Ingenic JZ4740 "glue layer"
 *
 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/usb/role.h>
#include <linux/usb/usb_phy_generic.h>

#include "musb_core.h"

struct jz4740_glue {
	struct platform_device	*pdev;
	struct musb		*musb;
	struct clk		*clk;
	struct usb_role_switch	*role_sw;
};

static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
{
	unsigned long	flags;
	irqreturn_t	retval = IRQ_NONE, retval_dma = IRQ_NONE;
	struct musb	*musb = __hci;

	if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller)
		retval_dma = dma_controller_irq(irq, musb->dma_controller);

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	/*
	 * The controller is gadget only, the state of the host mode IRQ bits is
	 * undefined. Mask them to make sure that the musb driver core will
	 * never see them set
	 */
	musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
			 MUSB_INTR_RESET | MUSB_INTR_SOF;

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	if (retval == IRQ_HANDLED || retval_dma == IRQ_HANDLED)
		return IRQ_HANDLED;

	return IRQ_NONE;
}

static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
};

static const struct musb_hdrc_config jz4740_musb_config = {
	/* Silicon does not implement USB OTG. */
	.multipoint	= 0,
	/* Max EPs scanned, driver will decide which EP can be used. */
	.num_eps	= 4,
	/* RAMbits needed to configure EPs from table */
	.ram_bits	= 9,
	.fifo_cfg	= jz4740_musb_fifo_cfg,
	.fifo_cfg_size	= ARRAY_SIZE(jz4740_musb_fifo_cfg),
};

static int jz4740_musb_role_switch_set(struct usb_role_switch *sw,
				       enum usb_role role)
{
	struct jz4740_glue *glue = usb_role_switch_get_drvdata(sw);
	struct usb_phy *phy = glue->musb->xceiv;

	switch (role) {
	case USB_ROLE_NONE:
		atomic_notifier_call_chain(&phy->notifier, USB_EVENT_NONE, phy);
		break;
	case USB_ROLE_DEVICE:
		atomic_notifier_call_chain(&phy->notifier, USB_EVENT_VBUS, phy);
		break;
	case USB_ROLE_HOST:
		atomic_notifier_call_chain(&phy->notifier, USB_EVENT_ID, phy);
		break;
	}

	return 0;
}

static int jz4740_musb_init(struct musb *musb)
{
	struct device *dev = musb->controller->parent;
	struct jz4740_glue *glue = dev_get_drvdata(dev);
	struct usb_role_switch_desc role_sw_desc = {
		.set = jz4740_musb_role_switch_set,
		.driver_data = glue,
		.fwnode = dev_fwnode(dev),
	};

	glue->musb = musb;

	if (dev->of_node)
		musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0);
	else
		musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
	if (IS_ERR(musb->xceiv))
		return dev_err_probe(dev, PTR_ERR(musb->xceiv),
				     "No transceiver configured\n");

	glue->role_sw = usb_role_switch_register(dev, &role_sw_desc);
	if (IS_ERR(glue->role_sw)) {
		dev_err(dev, "Failed to register USB role switch\n");
		return PTR_ERR(glue->role_sw);
	}

	/*
	 * Silicon does not implement ConfigData register.
	 * Set dyn_fifo to avoid reading EP config from hardware.
	 */
	musb->dyn_fifo = true;

	musb->isr = jz4740_musb_interrupt;

	return 0;
}

static int jz4740_musb_exit(struct musb *musb)
{
	struct jz4740_glue *glue = dev_get_drvdata(musb->controller->parent);

	usb_role_switch_unregister(glue->role_sw);

	return 0;
}

static const struct musb_platform_ops jz4740_musb_ops = {
	.quirks		= MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
	.fifo_mode	= 2,
	.init		= jz4740_musb_init,
	.exit		= jz4740_musb_exit,
#ifdef CONFIG_USB_INVENTRA_DMA
	.dma_init	= musbhs_dma_controller_create_noirq,
	.dma_exit	= musbhs_dma_controller_destroy,
#endif
};

static const struct musb_hdrc_platform_data jz4740_musb_pdata = {
	.mode		= MUSB_PERIPHERAL,
	.config		= &jz4740_musb_config,
	.platform_ops	= &jz4740_musb_ops,
};

static struct musb_fifo_cfg jz4770_musb_fifo_cfg[] = {
	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
};

static struct musb_hdrc_config jz4770_musb_config = {
	.multipoint	= 1,
	.num_eps	= 11,
	.ram_bits	= 11,
	.fifo_cfg	= jz4770_musb_fifo_cfg,
	.fifo_cfg_size	= ARRAY_SIZE(jz4770_musb_fifo_cfg),
};

static const struct musb_hdrc_platform_data jz4770_musb_pdata = {
	.mode		= MUSB_PERIPHERAL, /* TODO: support OTG */
	.config		= &jz4770_musb_config,
	.platform_ops	= &jz4740_musb_ops,
};

static int jz4740_probe(struct platform_device *pdev)
{
	struct device			*dev = &pdev->dev;
	const struct musb_hdrc_platform_data *pdata;
	struct platform_device		*musb;
	struct jz4740_glue		*glue;
	struct clk			*clk;
	int				ret;

	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
	if (!glue)
		return -ENOMEM;

	pdata = of_device_get_match_data(dev);
	if (!pdata) {
		dev_err(dev, "missing platform data\n");
		return -EINVAL;
	}

	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	if (!musb) {
		dev_err(dev, "failed to allocate musb device\n");
		return -ENOMEM;
	}

	clk = devm_clk_get(dev, "udc");
	if (IS_ERR(clk)) {
		dev_err(dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
		goto err_platform_device_put;
	}

	ret = clk_prepare_enable(clk);
	if (ret) {
		dev_err(dev, "failed to enable clock\n");
		goto err_platform_device_put;
	}

	musb->dev.parent		= dev;
	musb->dev.dma_mask		= &musb->dev.coherent_dma_mask;
	musb->dev.coherent_dma_mask	= DMA_BIT_MASK(32);
	device_set_of_node_from_dev(&musb->dev, dev);

	glue->pdev			= musb;
	glue->clk			= clk;

	platform_set_drvdata(pdev, glue);

	ret = platform_device_add_resources(musb, pdev->resource,
					    pdev->num_resources);
	if (ret) {
		dev_err(dev, "failed to add resources\n");
		goto err_clk_disable;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(dev, "failed to add platform_data\n");
		goto err_clk_disable;
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(dev, "failed to register musb device\n");
		goto err_clk_disable;
	}

	return 0;

err_clk_disable:
	clk_disable_unprepare(clk);
err_platform_device_put:
	platform_device_put(musb);
	return ret;
}

static int jz4740_remove(struct platform_device *pdev)
{
	struct jz4740_glue *glue = platform_get_drvdata(pdev);

	platform_device_unregister(glue->pdev);
	clk_disable_unprepare(glue->clk);

	return 0;
}

static const struct of_device_id jz4740_musb_of_match[] = {
	{ .compatible = "ingenic,jz4740-musb", .data = &jz4740_musb_pdata },
	{ .compatible = "ingenic,jz4770-musb", .data = &jz4770_musb_pdata },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, jz4740_musb_of_match);

static struct platform_driver jz4740_driver = {
	.probe		= jz4740_probe,
	.remove		= jz4740_remove,
	.driver		= {
		.name	= "musb-jz4740",
		.of_match_table = jz4740_musb_of_match,
	},
};

MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
MODULE_LICENSE("GPL v2");
module_platform_driver(jz4740_driver);