1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller
4 *
5 * Copyright (C) 2005-2007 AMD (https://www.amd.com)
6 * Author: Thomas Dahlmann
7 */
8
9 /*
10 * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
11 * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
12 * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
13 *
14 * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
15 * be used as host port) and UOC bits PAD_EN and APU are set (should be done
16 * by BIOS init).
17 *
18 * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
19 * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
20 * can be used with gadget ether.
21 *
22 * This file does pci device registration, and the core driver implementation
23 * is done in amd5536udc.c
24 *
25 * The driver is split so as to use the core UDC driver which is based on
26 * Synopsys device controller IP (different than HS OTG IP) in UDCs
27 * integrated to SoC platforms.
28 *
29 */
30
31 /* Driver strings */
32 #define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller"
33
34 /* system */
35 #include <linux/device.h>
36 #include <linux/dmapool.h>
37 #include <linux/interrupt.h>
38 #include <linux/io.h>
39 #include <linux/irq.h>
40 #include <linux/module.h>
41 #include <linux/moduleparam.h>
42 #include <linux/prefetch.h>
43 #include <linux/pci.h>
44
45 /* udc specific */
46 #include "amd5536udc.h"
47
48 /* pointer to device object */
49 static struct udc *udc;
50
51 /* description */
52 static const char name[] = "amd5536udc-pci";
53
54 /* Reset all pci context */
udc_pci_remove(struct pci_dev * pdev)55 static void udc_pci_remove(struct pci_dev *pdev)
56 {
57 struct udc *dev;
58
59 dev = pci_get_drvdata(pdev);
60
61 usb_del_gadget_udc(&udc->gadget);
62 /* gadget driver must not be registered */
63 if (WARN_ON(dev->driver))
64 return;
65
66 /* dma pool cleanup */
67 free_dma_pools(dev);
68
69 /* reset controller */
70 writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
71 free_irq(pdev->irq, dev);
72 iounmap(dev->virt_addr);
73 release_mem_region(pci_resource_start(pdev, 0),
74 pci_resource_len(pdev, 0));
75 pci_disable_device(pdev);
76
77 udc_remove(dev);
78 }
79
80 /* Called by pci bus driver to init pci context */
udc_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)81 static int udc_pci_probe(
82 struct pci_dev *pdev,
83 const struct pci_device_id *id
84 )
85 {
86 struct udc *dev;
87 unsigned long resource;
88 unsigned long len;
89 int retval = 0;
90
91 /* one udc only */
92 if (udc) {
93 dev_dbg(&pdev->dev, "already probed\n");
94 return -EBUSY;
95 }
96
97 /* init */
98 dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
99 if (!dev)
100 return -ENOMEM;
101
102 /* pci setup */
103 if (pci_enable_device(pdev) < 0) {
104 retval = -ENODEV;
105 goto err_pcidev;
106 }
107
108 /* PCI resource allocation */
109 resource = pci_resource_start(pdev, 0);
110 len = pci_resource_len(pdev, 0);
111
112 if (!request_mem_region(resource, len, name)) {
113 dev_dbg(&pdev->dev, "pci device used already\n");
114 retval = -EBUSY;
115 goto err_memreg;
116 }
117
118 dev->virt_addr = ioremap(resource, len);
119 if (!dev->virt_addr) {
120 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
121 retval = -EFAULT;
122 goto err_ioremap;
123 }
124
125 if (!pdev->irq) {
126 dev_err(&pdev->dev, "irq not set\n");
127 retval = -ENODEV;
128 goto err_irq;
129 }
130
131 spin_lock_init(&dev->lock);
132 /* udc csr registers base */
133 dev->csr = dev->virt_addr + UDC_CSR_ADDR;
134 /* dev registers base */
135 dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
136 /* ep registers base */
137 dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
138 /* fifo's base */
139 dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
140 dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
141
142 if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
143 dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq);
144 retval = -EBUSY;
145 goto err_irq;
146 }
147
148 pci_set_drvdata(pdev, dev);
149
150 /* chip revision for Hs AMD5536 */
151 dev->chiprev = pdev->revision;
152
153 pci_set_master(pdev);
154 pci_try_set_mwi(pdev);
155
156 dev->phys_addr = resource;
157 dev->irq = pdev->irq;
158 dev->pdev = pdev;
159 dev->dev = &pdev->dev;
160
161 /* init dma pools */
162 if (use_dma) {
163 retval = init_dma_pools(dev);
164 if (retval != 0)
165 goto err_dma;
166 }
167
168 /* general probing */
169 if (udc_probe(dev)) {
170 retval = -ENODEV;
171 goto err_probe;
172 }
173 return 0;
174
175 err_probe:
176 if (use_dma)
177 free_dma_pools(dev);
178 err_dma:
179 free_irq(pdev->irq, dev);
180 err_irq:
181 iounmap(dev->virt_addr);
182 err_ioremap:
183 release_mem_region(resource, len);
184 err_memreg:
185 pci_disable_device(pdev);
186 err_pcidev:
187 kfree(dev);
188 return retval;
189 }
190
191 /* PCI device parameters */
192 static const struct pci_device_id pci_id[] = {
193 {
194 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
195 .class = PCI_CLASS_SERIAL_USB_DEVICE,
196 .class_mask = 0xffffffff,
197 },
198 {},
199 };
200 MODULE_DEVICE_TABLE(pci, pci_id);
201
202 /* PCI functions */
203 static struct pci_driver udc_pci_driver = {
204 .name = name,
205 .id_table = pci_id,
206 .probe = udc_pci_probe,
207 .remove = udc_pci_remove,
208 };
209 module_pci_driver(udc_pci_driver);
210
211 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
212 MODULE_AUTHOR("Thomas Dahlmann");
213 MODULE_LICENSE("GPL");
214