1/*
2 * c67x00-drv.c: Cypress C67X00 USB Common infrastructure
3 *
4 * Copyright (C) 2006-2008 Barco N.V.
5 *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
6 *    based on multiple host controller drivers inside the linux kernel.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21 * MA  02110-1301  USA.
22 */
23
24/*
25 * This file implements the common infrastructure for using the c67x00.
26 * It is both the link between the platform configuration and subdrivers and
27 * the link between the common hardware parts and the subdrivers (e.g.
28 * interrupt handling).
29 *
30 * The c67x00 has 2 SIE's (serial interface engine) which can be configured
31 * to be host, device or OTG (with some limitations, E.G. only SIE1 can be OTG).
32 *
33 * Depending on the platform configuration, the SIE's are created and
34 * the corresponding subdriver is initialized (c67x00_probe_sie).
35 */
36
37#include <linux/device.h>
38#include <linux/io.h>
39#include <linux/list.h>
40#include <linux/slab.h>
41#include <linux/module.h>
42#include <linux/usb.h>
43#include <linux/usb/c67x00.h>
44
45#include "c67x00.h"
46#include "c67x00-hcd.h"
47
48static void c67x00_probe_sie(struct c67x00_sie *sie,
49			     struct c67x00_device *dev, int sie_num)
50{
51	spin_lock_init(&sie->lock);
52	sie->dev = dev;
53	sie->sie_num = sie_num;
54	sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
55
56	switch (sie->mode) {
57	case C67X00_SIE_HOST:
58		c67x00_hcd_probe(sie);
59		break;
60
61	case C67X00_SIE_UNUSED:
62		dev_info(sie_dev(sie),
63			 "Not using SIE %d as requested\n", sie->sie_num);
64		break;
65
66	default:
67		dev_err(sie_dev(sie),
68			"Unsupported configuration: 0x%x for SIE %d\n",
69			sie->mode, sie->sie_num);
70		break;
71	}
72}
73
74static void c67x00_remove_sie(struct c67x00_sie *sie)
75{
76	switch (sie->mode) {
77	case C67X00_SIE_HOST:
78		c67x00_hcd_remove(sie);
79		break;
80
81	default:
82		break;
83	}
84}
85
86static irqreturn_t c67x00_irq(int irq, void *__dev)
87{
88	struct c67x00_device *c67x00 = __dev;
89	struct c67x00_sie *sie;
90	u16 msg, int_status;
91	int i, count = 8;
92
93	int_status = c67x00_ll_hpi_status(c67x00);
94	if (!int_status)
95		return IRQ_NONE;
96
97	while (int_status != 0 && (count-- >= 0)) {
98		c67x00_ll_irq(c67x00, int_status);
99		for (i = 0; i < C67X00_SIES; i++) {
100			sie = &c67x00->sie[i];
101			msg = 0;
102			if (int_status & SIEMSG_FLG(i))
103				msg = c67x00_ll_fetch_siemsg(c67x00, i);
104			if (sie->irq)
105				sie->irq(sie, int_status, msg);
106		}
107		int_status = c67x00_ll_hpi_status(c67x00);
108	}
109
110	if (int_status)
111		dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! "
112			 "status = 0x%04x\n", int_status);
113
114	return IRQ_HANDLED;
115}
116
117/* ------------------------------------------------------------------------- */
118
119static int c67x00_drv_probe(struct platform_device *pdev)
120{
121	struct c67x00_device *c67x00;
122	struct c67x00_platform_data *pdata;
123	struct resource *res, *res2;
124	int ret, i;
125
126	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127	if (!res)
128		return -ENODEV;
129
130	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
131	if (!res2)
132		return -ENODEV;
133
134	pdata = dev_get_platdata(&pdev->dev);
135	if (!pdata)
136		return -ENODEV;
137
138	c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL);
139	if (!c67x00)
140		return -ENOMEM;
141
142	if (!request_mem_region(res->start, resource_size(res),
143				pdev->name)) {
144		dev_err(&pdev->dev, "Memory region busy\n");
145		ret = -EBUSY;
146		goto request_mem_failed;
147	}
148	c67x00->hpi.base = ioremap(res->start, resource_size(res));
149	if (!c67x00->hpi.base) {
150		dev_err(&pdev->dev, "Unable to map HPI registers\n");
151		ret = -EIO;
152		goto map_failed;
153	}
154
155	spin_lock_init(&c67x00->hpi.lock);
156	c67x00->hpi.regstep = pdata->hpi_regstep;
157	c67x00->pdata = dev_get_platdata(&pdev->dev);
158	c67x00->pdev = pdev;
159
160	c67x00_ll_init(c67x00);
161	c67x00_ll_hpi_reg_init(c67x00);
162
163	ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
164	if (ret) {
165		dev_err(&pdev->dev, "Cannot claim IRQ\n");
166		goto request_irq_failed;
167	}
168
169	ret = c67x00_ll_reset(c67x00);
170	if (ret) {
171		dev_err(&pdev->dev, "Device reset failed\n");
172		goto reset_failed;
173	}
174
175	for (i = 0; i < C67X00_SIES; i++)
176		c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
177
178	platform_set_drvdata(pdev, c67x00);
179
180	return 0;
181
182 reset_failed:
183	free_irq(res2->start, c67x00);
184 request_irq_failed:
185	iounmap(c67x00->hpi.base);
186 map_failed:
187	release_mem_region(res->start, resource_size(res));
188 request_mem_failed:
189	kfree(c67x00);
190
191	return ret;
192}
193
194static int c67x00_drv_remove(struct platform_device *pdev)
195{
196	struct c67x00_device *c67x00 = platform_get_drvdata(pdev);
197	struct resource *res;
198	int i;
199
200	for (i = 0; i < C67X00_SIES; i++)
201		c67x00_remove_sie(&c67x00->sie[i]);
202
203	c67x00_ll_release(c67x00);
204
205	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
206	if (res)
207		free_irq(res->start, c67x00);
208
209	iounmap(c67x00->hpi.base);
210
211	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
212	if (res)
213		release_mem_region(res->start, resource_size(res));
214
215	kfree(c67x00);
216
217	return 0;
218}
219
220static struct platform_driver c67x00_driver = {
221	.probe	= c67x00_drv_probe,
222	.remove	= c67x00_drv_remove,
223	.driver	= {
224		.name = "c67x00",
225	},
226};
227
228module_platform_driver(c67x00_driver);
229
230MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely");
231MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver");
232MODULE_LICENSE("GPL");
233MODULE_ALIAS("platform:c67x00");
234