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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller
*
* Copyright (C) 2005-2007 AMD (http://www.amd.com)
* Author: Thomas Dahlmann
*/
/*
* The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
* It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
* provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
*
* Make sure that UDC is assigned to port 4 by BIOS settings (port can also
* be used as host port) and UOC bits PAD_EN and APU are set (should be done
* by BIOS init).
*
* UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
* work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
* can be used with gadget ether.
*
* This file does pci device registration, and the core driver implementation
* is done in amd5536udc.c
*
* The driver is split so as to use the core UDC driver which is based on
* Synopsys device controller IP (different than HS OTG IP) in UDCs
* integrated to SoC platforms.
*
*/
/* Driver strings */
#define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller"
/* system */
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/prefetch.h>
#include <linux/pci.h>
/* udc specific */
#include "amd5536udc.h"
/* pointer to device object */
static struct udc *udc;
/* description */
static const char mod_desc[] = UDC_MOD_DESCRIPTION;
static const char name[] = "amd5536udc-pci";
/* Reset all pci context */
static void udc_pci_remove(struct pci_dev *pdev)
{
struct udc *dev;
dev = pci_get_drvdata(pdev);
usb_del_gadget_udc(&udc->gadget);
/* gadget driver must not be registered */
if (WARN_ON(dev->driver))
return;
/* dma pool cleanup */
free_dma_pools(dev);
/* reset controller */
writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
free_irq(pdev->irq, dev);
iounmap(dev->virt_addr);
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
pci_disable_device(pdev);
udc_remove(dev);
}
/* Called by pci bus driver to init pci context */
static int udc_pci_probe(
struct pci_dev *pdev,
const struct pci_device_id *id
)
{
struct udc *dev;
unsigned long resource;
unsigned long len;
int retval = 0;
/* one udc only */
if (udc) {
dev_dbg(&pdev->dev, "already probed\n");
return -EBUSY;
}
/* init */
dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
if (!dev)
return -ENOMEM;
/* pci setup */
if (pci_enable_device(pdev) < 0) {
retval = -ENODEV;
goto err_pcidev;
}
/* PCI resource allocation */
resource = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!request_mem_region(resource, len, name)) {
dev_dbg(&pdev->dev, "pci device used already\n");
retval = -EBUSY;
goto err_memreg;
}
dev->virt_addr = ioremap(resource, len);
if (!dev->virt_addr) {
dev_dbg(&pdev->dev, "start address cannot be mapped\n");
retval = -EFAULT;
goto err_ioremap;
}
if (!pdev->irq) {
dev_err(&pdev->dev, "irq not set\n");
retval = -ENODEV;
goto err_irq;
}
spin_lock_init(&dev->lock);
/* udc csr registers base */
dev->csr = dev->virt_addr + UDC_CSR_ADDR;
/* dev registers base */
dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
/* ep registers base */
dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
/* fifo's base */
dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq);
retval = -EBUSY;
goto err_irq;
}
pci_set_drvdata(pdev, dev);
/* chip revision for Hs AMD5536 */
dev->chiprev = pdev->revision;
pci_set_master(pdev);
pci_try_set_mwi(pdev);
/* init dma pools */
if (use_dma) {
retval = init_dma_pools(dev);
if (retval != 0)
goto err_dma;
}
dev->phys_addr = resource;
dev->irq = pdev->irq;
dev->pdev = pdev;
dev->dev = &pdev->dev;
/* general probing */
if (udc_probe(dev)) {
retval = -ENODEV;
goto err_probe;
}
return 0;
err_probe:
if (use_dma)
free_dma_pools(dev);
err_dma:
free_irq(pdev->irq, dev);
err_irq:
iounmap(dev->virt_addr);
err_ioremap:
release_mem_region(resource, len);
err_memreg:
pci_disable_device(pdev);
err_pcidev:
kfree(dev);
return retval;
}
/* PCI device parameters */
static const struct pci_device_id pci_id[] = {
{
PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
},
{},
};
MODULE_DEVICE_TABLE(pci, pci_id);
/* PCI functions */
static struct pci_driver udc_pci_driver = {
.name = (char *) name,
.id_table = pci_id,
.probe = udc_pci_probe,
.remove = udc_pci_remove,
};
module_pci_driver(udc_pci_driver);
MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
MODULE_AUTHOR("Thomas Dahlmann");
MODULE_LICENSE("GPL");
|
