1 // SPDX-License-Identifier: GPL-2.0+
3 * amd5536udc_pci.c -- AMD 5536 UDC high/full speed USB device controller
5 * Copyright (C) 2005-2007 AMD (https://www.amd.com)
6 * Author: Thomas Dahlmann
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).
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
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.
22 * This file does pci device registration, and the core driver implementation
23 * is done in amd5536udc.c
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.
32 #define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller"
35 #include <linux/device.h>
36 #include <linux/dmapool.h>
37 #include <linux/interrupt.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>
46 #include "amd5536udc.h"
48 /* pointer to device object */
49 static struct udc *udc;
52 static const char name[] = "amd5536udc-pci";
54 /* Reset all pci context */
55 static void udc_pci_remove(struct pci_dev *pdev)
59 dev = pci_get_drvdata(pdev);
61 usb_del_gadget_udc(&udc->gadget);
62 /* gadget driver must not be registered */
63 if (WARN_ON(dev->driver))
66 /* dma pool cleanup */
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);
80 /* Called by pci bus driver to init pci context */
81 static int udc_pci_probe(
83 const struct pci_device_id *id
87 unsigned long resource;
93 dev_dbg(&pdev->dev, "already probed\n");
98 dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
103 if (pci_enable_device(pdev) < 0) {
108 /* PCI resource allocation */
109 resource = pci_resource_start(pdev, 0);
110 len = pci_resource_len(pdev, 0);
112 if (!request_mem_region(resource, len, name)) {
113 dev_dbg(&pdev->dev, "pci device used already\n");
118 dev->virt_addr = ioremap(resource, len);
119 if (!dev->virt_addr) {
120 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
126 dev_err(&pdev->dev, "irq not set\n");
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;
139 dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
140 dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
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);
148 pci_set_drvdata(pdev, dev);
150 /* chip revision for Hs AMD5536 */
151 dev->chiprev = pdev->revision;
153 pci_set_master(pdev);
154 pci_try_set_mwi(pdev);
156 dev->phys_addr = resource;
157 dev->irq = pdev->irq;
159 dev->dev = &pdev->dev;
163 retval = init_dma_pools(dev);
168 /* general probing */
169 if (udc_probe(dev)) {
182 free_irq(pdev->irq, dev);
184 iounmap(dev->virt_addr);
186 release_mem_region(resource, len);
188 pci_disable_device(pdev);
194 /* PCI device parameters */
195 static const struct pci_device_id pci_id[] = {
197 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
198 .class = PCI_CLASS_SERIAL_USB_DEVICE,
199 .class_mask = 0xffffffff,
203 MODULE_DEVICE_TABLE(pci, pci_id);
206 static struct pci_driver udc_pci_driver = {
209 .probe = udc_pci_probe,
210 .remove = udc_pci_remove,
212 module_pci_driver(udc_pci_driver);
214 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
215 MODULE_AUTHOR("Thomas Dahlmann");
216 MODULE_LICENSE("GPL");