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 */ |
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(gadget: &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), addr: &dev->regs->cfg); |
71 | free_irq(pdev->irq, dev); |
72 | iounmap(addr: dev->virt_addr); |
73 | release_mem_region(pci_resource_start(pdev, 0), |
74 | pci_resource_len(pdev, 0)); |
75 | pci_disable_device(dev: pdev); |
76 | |
77 | udc_remove(dev); |
78 | } |
79 | |
80 | /* Called by pci bus driver to init pci context */ |
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(size: sizeof(struct udc), GFP_KERNEL); |
99 | if (!dev) |
100 | return -ENOMEM; |
101 | |
102 | /* pci setup */ |
103 | if (pci_enable_device(dev: 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(offset: resource, size: 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(irq: pdev->irq, handler: 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, data: dev); |
149 | |
150 | /* chip revision for Hs AMD5536 */ |
151 | dev->chiprev = pdev->revision; |
152 | |
153 | pci_set_master(dev: pdev); |
154 | pci_try_set_mwi(dev: 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 | |
174 | udc = dev; |
175 | |
176 | return 0; |
177 | |
178 | err_probe: |
179 | if (use_dma) |
180 | free_dma_pools(dev); |
181 | err_dma: |
182 | free_irq(pdev->irq, dev); |
183 | err_irq: |
184 | iounmap(addr: dev->virt_addr); |
185 | err_ioremap: |
186 | release_mem_region(resource, len); |
187 | err_memreg: |
188 | pci_disable_device(dev: pdev); |
189 | err_pcidev: |
190 | kfree(objp: dev); |
191 | return retval; |
192 | } |
193 | |
194 | /* PCI device parameters */ |
195 | static const struct pci_device_id pci_id[] = { |
196 | { |
197 | PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096), |
198 | .class = PCI_CLASS_SERIAL_USB_DEVICE, |
199 | .class_mask = 0xffffffff, |
200 | }, |
201 | {}, |
202 | }; |
203 | MODULE_DEVICE_TABLE(pci, pci_id); |
204 | |
205 | /* PCI functions */ |
206 | static struct pci_driver udc_pci_driver = { |
207 | .name = name, |
208 | .id_table = pci_id, |
209 | .probe = udc_pci_probe, |
210 | .remove = udc_pci_remove, |
211 | }; |
212 | module_pci_driver(udc_pci_driver); |
213 | |
214 | MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION); |
215 | MODULE_AUTHOR("Thomas Dahlmann" ); |
216 | MODULE_LICENSE("GPL" ); |
217 | |