1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * c67x00-drv.c: Cypress C67X00 USB Common infrastructure
4 *
5 * Copyright (C) 2006-2008 Barco N.V.
6 * Derived from the Cypress cy7c67200/300 ezusb linux driver and
7 * based on multiple host controller drivers inside the linux kernel.
8 */
9
10 /*
11 * This file implements the common infrastructure for using the c67x00.
12 * It is both the link between the platform configuration and subdrivers and
13 * the link between the common hardware parts and the subdrivers (e.g.
14 * interrupt handling).
15 *
16 * The c67x00 has 2 SIE's (serial interface engine) which can be configured
17 * to be host, device or OTG (with some limitations, E.G. only SIE1 can be OTG).
18 *
19 * Depending on the platform configuration, the SIE's are created and
20 * the corresponding subdriver is initialized (c67x00_probe_sie).
21 */
22
23 #include <linux/device.h>
24 #include <linux/io.h>
25 #include <linux/list.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/usb/c67x00.h>
30
31 #include "c67x00.h"
32 #include "c67x00-hcd.h"
33
c67x00_probe_sie(struct c67x00_sie * sie,struct c67x00_device * dev,int sie_num)34 static void c67x00_probe_sie(struct c67x00_sie *sie,
35 struct c67x00_device *dev, int sie_num)
36 {
37 spin_lock_init(&sie->lock);
38 sie->dev = dev;
39 sie->sie_num = sie_num;
40 sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
41
42 switch (sie->mode) {
43 case C67X00_SIE_HOST:
44 c67x00_hcd_probe(sie);
45 break;
46
47 case C67X00_SIE_UNUSED:
48 dev_info(sie_dev(sie),
49 "Not using SIE %d as requested\n", sie->sie_num);
50 break;
51
52 default:
53 dev_err(sie_dev(sie),
54 "Unsupported configuration: 0x%x for SIE %d\n",
55 sie->mode, sie->sie_num);
56 break;
57 }
58 }
59
c67x00_remove_sie(struct c67x00_sie * sie)60 static void c67x00_remove_sie(struct c67x00_sie *sie)
61 {
62 switch (sie->mode) {
63 case C67X00_SIE_HOST:
64 c67x00_hcd_remove(sie);
65 break;
66
67 default:
68 break;
69 }
70 }
71
c67x00_irq(int irq,void * __dev)72 static irqreturn_t c67x00_irq(int irq, void *__dev)
73 {
74 struct c67x00_device *c67x00 = __dev;
75 struct c67x00_sie *sie;
76 u16 msg, int_status;
77 int i, count = 8;
78
79 int_status = c67x00_ll_hpi_status(c67x00);
80 if (!int_status)
81 return IRQ_NONE;
82
83 while (int_status != 0 && (count-- >= 0)) {
84 c67x00_ll_irq(c67x00, int_status);
85 for (i = 0; i < C67X00_SIES; i++) {
86 sie = &c67x00->sie[i];
87 msg = 0;
88 if (int_status & SIEMSG_FLG(i))
89 msg = c67x00_ll_fetch_siemsg(c67x00, i);
90 if (sie->irq)
91 sie->irq(sie, int_status, msg);
92 }
93 int_status = c67x00_ll_hpi_status(c67x00);
94 }
95
96 if (int_status)
97 dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! "
98 "status = 0x%04x\n", int_status);
99
100 return IRQ_HANDLED;
101 }
102
103 /* ------------------------------------------------------------------------- */
104
c67x00_drv_probe(struct platform_device * pdev)105 static int c67x00_drv_probe(struct platform_device *pdev)
106 {
107 struct c67x00_device *c67x00;
108 struct c67x00_platform_data *pdata;
109 struct resource *res, *res2;
110 int ret, i;
111
112 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113 if (!res)
114 return -ENODEV;
115
116 res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
117 if (!res2)
118 return -ENODEV;
119
120 pdata = dev_get_platdata(&pdev->dev);
121 if (!pdata)
122 return -ENODEV;
123
124 c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL);
125 if (!c67x00)
126 return -ENOMEM;
127
128 if (!request_mem_region(res->start, resource_size(res),
129 pdev->name)) {
130 dev_err(&pdev->dev, "Memory region busy\n");
131 ret = -EBUSY;
132 goto request_mem_failed;
133 }
134 c67x00->hpi.base = ioremap(res->start, resource_size(res));
135 if (!c67x00->hpi.base) {
136 dev_err(&pdev->dev, "Unable to map HPI registers\n");
137 ret = -EIO;
138 goto map_failed;
139 }
140
141 spin_lock_init(&c67x00->hpi.lock);
142 c67x00->hpi.regstep = pdata->hpi_regstep;
143 c67x00->pdata = dev_get_platdata(&pdev->dev);
144 c67x00->pdev = pdev;
145
146 c67x00_ll_init(c67x00);
147 c67x00_ll_hpi_reg_init(c67x00);
148
149 ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
150 if (ret) {
151 dev_err(&pdev->dev, "Cannot claim IRQ\n");
152 goto request_irq_failed;
153 }
154
155 ret = c67x00_ll_reset(c67x00);
156 if (ret) {
157 dev_err(&pdev->dev, "Device reset failed\n");
158 goto reset_failed;
159 }
160
161 for (i = 0; i < C67X00_SIES; i++)
162 c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
163
164 platform_set_drvdata(pdev, c67x00);
165
166 return 0;
167
168 reset_failed:
169 free_irq(res2->start, c67x00);
170 request_irq_failed:
171 iounmap(c67x00->hpi.base);
172 map_failed:
173 release_mem_region(res->start, resource_size(res));
174 request_mem_failed:
175 kfree(c67x00);
176
177 return ret;
178 }
179
c67x00_drv_remove(struct platform_device * pdev)180 static void c67x00_drv_remove(struct platform_device *pdev)
181 {
182 struct c67x00_device *c67x00 = platform_get_drvdata(pdev);
183 struct resource *res;
184 int i;
185
186 for (i = 0; i < C67X00_SIES; i++)
187 c67x00_remove_sie(&c67x00->sie[i]);
188
189 c67x00_ll_release(c67x00);
190
191 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
192 free_irq(res->start, c67x00);
193
194 iounmap(c67x00->hpi.base);
195
196 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197 release_mem_region(res->start, resource_size(res));
198
199 kfree(c67x00);
200 }
201
202 static struct platform_driver c67x00_driver = {
203 .probe = c67x00_drv_probe,
204 .remove_new = c67x00_drv_remove,
205 .driver = {
206 .name = "c67x00",
207 },
208 };
209
210 module_platform_driver(c67x00_driver);
211
212 MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely");
213 MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver");
214 MODULE_LICENSE("GPL");
215 MODULE_ALIAS("platform:c67x00");
216