1/*
2 * Ingenic JZ4740 "glue layer"
3 *
4 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * You should have received a copy of the GNU General Public License along
12 * with this program; if not, write to the Free Software Foundation, Inc.,
13 * 675 Mass Ave, Cambridge, MA 02139, USA.
14 */
15
16#include <linux/clk.h>
17#include <linux/dma-mapping.h>
18#include <linux/errno.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/platform_device.h>
22#include <linux/usb/usb_phy_generic.h>
23
24#include "musb_core.h"
25
26struct jz4740_glue {
27	struct device           *dev;
28	struct platform_device  *musb;
29	struct clk		*clk;
30};
31
32static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
33{
34	unsigned long   flags;
35	irqreturn_t     retval = IRQ_NONE;
36	struct musb     *musb = __hci;
37
38	spin_lock_irqsave(&musb->lock, flags);
39
40	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
41	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
42	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
43
44	/*
45	 * The controller is gadget only, the state of the host mode IRQ bits is
46	 * undefined. Mask them to make sure that the musb driver core will
47	 * never see them set
48	 */
49	musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
50	    MUSB_INTR_RESET | MUSB_INTR_SOF;
51
52	if (musb->int_usb || musb->int_tx || musb->int_rx)
53		retval = musb_interrupt(musb);
54
55	spin_unlock_irqrestore(&musb->lock, flags);
56
57	return retval;
58}
59
60static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
61{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
62{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
63{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
64};
65
66static struct musb_hdrc_config jz4740_musb_config = {
67	/* Silicon does not implement USB OTG. */
68	.multipoint = 0,
69	/* Max EPs scanned, driver will decide which EP can be used. */
70	.num_eps    = 4,
71	/* RAMbits needed to configure EPs from table */
72	.ram_bits   = 9,
73	.fifo_cfg = jz4740_musb_fifo_cfg,
74	.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
75};
76
77static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
78	.mode   = MUSB_PERIPHERAL,
79	.config = &jz4740_musb_config,
80};
81
82static int jz4740_musb_init(struct musb *musb)
83{
84	usb_phy_generic_register();
85	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
86	if (!musb->xceiv) {
87		pr_err("HS UDC: no transceiver configured\n");
88		return -ENODEV;
89	}
90
91	/* Silicon does not implement ConfigData register.
92	 * Set dyn_fifo to avoid reading EP config from hardware.
93	 */
94	musb->dyn_fifo = true;
95
96	musb->isr = jz4740_musb_interrupt;
97
98	return 0;
99}
100
101static int jz4740_musb_exit(struct musb *musb)
102{
103	usb_put_phy(musb->xceiv);
104
105	return 0;
106}
107
108static const struct musb_platform_ops jz4740_musb_ops = {
109	.quirks		= MUSB_INDEXED_EP,
110	.fifo_mode	= 2,
111	.init		= jz4740_musb_init,
112	.exit		= jz4740_musb_exit,
113};
114
115static int jz4740_probe(struct platform_device *pdev)
116{
117	struct musb_hdrc_platform_data	*pdata = &jz4740_musb_platform_data;
118	struct platform_device		*musb;
119	struct jz4740_glue		*glue;
120	struct clk                      *clk;
121	int				ret;
122
123	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
124	if (!glue)
125		return -ENOMEM;
126
127	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
128	if (!musb) {
129		dev_err(&pdev->dev, "failed to allocate musb device\n");
130		return -ENOMEM;
131	}
132
133	clk = devm_clk_get(&pdev->dev, "udc");
134	if (IS_ERR(clk)) {
135		dev_err(&pdev->dev, "failed to get clock\n");
136		ret = PTR_ERR(clk);
137		goto err_platform_device_put;
138	}
139
140	ret = clk_prepare_enable(clk);
141	if (ret) {
142		dev_err(&pdev->dev, "failed to enable clock\n");
143		goto err_platform_device_put;
144	}
145
146	musb->dev.parent		= &pdev->dev;
147
148	glue->dev			= &pdev->dev;
149	glue->musb			= musb;
150	glue->clk			= clk;
151
152	pdata->platform_ops		= &jz4740_musb_ops;
153
154	platform_set_drvdata(pdev, glue);
155
156	ret = platform_device_add_resources(musb, pdev->resource,
157					    pdev->num_resources);
158	if (ret) {
159		dev_err(&pdev->dev, "failed to add resources\n");
160		goto err_clk_disable;
161	}
162
163	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
164	if (ret) {
165		dev_err(&pdev->dev, "failed to add platform_data\n");
166		goto err_clk_disable;
167	}
168
169	ret = platform_device_add(musb);
170	if (ret) {
171		dev_err(&pdev->dev, "failed to register musb device\n");
172		goto err_clk_disable;
173	}
174
175	return 0;
176
177err_clk_disable:
178	clk_disable_unprepare(clk);
179err_platform_device_put:
180	platform_device_put(musb);
181	return ret;
182}
183
184static int jz4740_remove(struct platform_device *pdev)
185{
186	struct jz4740_glue	*glue = platform_get_drvdata(pdev);
187
188	platform_device_unregister(glue->musb);
189	usb_phy_generic_unregister(pdev);
190	clk_disable_unprepare(glue->clk);
191
192	return 0;
193}
194
195static struct platform_driver jz4740_driver = {
196	.probe		= jz4740_probe,
197	.remove		= jz4740_remove,
198	.driver		= {
199		.name	= "musb-jz4740",
200	},
201};
202
203MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
204MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
205MODULE_LICENSE("GPL v2");
206module_platform_driver(jz4740_driver);
207