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Linux/drivers/usb/host/ssb-hcd.c

  1 /*
  2  * Sonics Silicon Backplane
  3  * Broadcom USB-core driver  (SSB bus glue)
  4  *
  5  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
  6  *
  7  * Based on ssb-ohci driver
  8  * Copyright 2007 Michael Buesch <m@bues.ch>
  9  *
 10  * Derived from the OHCI-PCI driver
 11  * Copyright 1999 Roman Weissgaerber
 12  * Copyright 2000-2002 David Brownell
 13  * Copyright 1999 Linus Torvalds
 14  * Copyright 1999 Gregory P. Smith
 15  *
 16  * Derived from the USBcore related parts of Broadcom-SB
 17  * Copyright 2005-2011 Broadcom Corporation
 18  *
 19  * Licensed under the GNU/GPL. See COPYING for details.
 20  */
 21 #include <linux/ssb/ssb.h>
 22 #include <linux/delay.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/module.h>
 25 #include <linux/slab.h>
 26 #include <linux/usb/ehci_pdriver.h>
 27 #include <linux/usb/ohci_pdriver.h>
 28 
 29 MODULE_AUTHOR("Hauke Mehrtens");
 30 MODULE_DESCRIPTION("Common USB driver for SSB Bus");
 31 MODULE_LICENSE("GPL");
 32 
 33 #define SSB_HCD_TMSLOW_HOSTMODE (1 << 29)
 34 
 35 struct ssb_hcd_device {
 36         struct platform_device *ehci_dev;
 37         struct platform_device *ohci_dev;
 38 
 39         u32 enable_flags;
 40 };
 41 
 42 static void ssb_hcd_5354wa(struct ssb_device *dev)
 43 {
 44 #ifdef CONFIG_SSB_DRIVER_MIPS
 45         /* Work around for 5354 failures */
 46         if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
 47                 /* Change syn01 reg */
 48                 ssb_write32(dev, 0x894, 0x00fe00fe);
 49 
 50                 /* Change syn03 reg */
 51                 ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
 52         }
 53 #endif
 54 }
 55 
 56 static void ssb_hcd_usb20wa(struct ssb_device *dev)
 57 {
 58         if (dev->id.coreid == SSB_DEV_USB20_HOST) {
 59                 /*
 60                  * USB 2.0 special considerations:
 61                  *
 62                  * In addition to the standard SSB reset sequence, the Host
 63                  * Control Register must be programmed to bring the USB core
 64                  * and various phy components out of reset.
 65                  */
 66                 ssb_write32(dev, 0x200, 0x7ff);
 67 
 68                 /* Change Flush control reg */
 69                 ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
 70                 ssb_read32(dev, 0x400);
 71 
 72                 /* Change Shim control reg */
 73                 ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
 74                 ssb_read32(dev, 0x304);
 75 
 76                 udelay(1);
 77 
 78                 ssb_hcd_5354wa(dev);
 79         }
 80 }
 81 
 82 /* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
 83 static u32 ssb_hcd_init_chip(struct ssb_device *dev)
 84 {
 85         u32 flags = 0;
 86 
 87         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
 88                 /* Put the device into host-mode. */
 89                 flags |= SSB_HCD_TMSLOW_HOSTMODE;
 90 
 91         ssb_device_enable(dev, flags);
 92 
 93         ssb_hcd_usb20wa(dev);
 94 
 95         return flags;
 96 }
 97 
 98 static const struct usb_ehci_pdata ehci_pdata = {
 99 };
100 
101 static const struct usb_ohci_pdata ohci_pdata = {
102 };
103 
104 static struct platform_device *ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
105 {
106         struct platform_device *hci_dev;
107         struct resource hci_res[2];
108         int ret = -ENOMEM;
109 
110         memset(hci_res, 0, sizeof(hci_res));
111 
112         hci_res[0].start = addr;
113         hci_res[0].end = hci_res[0].start + len - 1;
114         hci_res[0].flags = IORESOURCE_MEM;
115 
116         hci_res[1].start = dev->irq;
117         hci_res[1].flags = IORESOURCE_IRQ;
118 
119         hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
120                                         "ehci-platform" , 0);
121         if (!hci_dev)
122                 return NULL;
123 
124         hci_dev->dev.parent = dev->dev;
125         hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
126 
127         ret = platform_device_add_resources(hci_dev, hci_res,
128                                             ARRAY_SIZE(hci_res));
129         if (ret)
130                 goto err_alloc;
131         if (ohci)
132                 ret = platform_device_add_data(hci_dev, &ohci_pdata,
133                                                sizeof(ohci_pdata));
134         else
135                 ret = platform_device_add_data(hci_dev, &ehci_pdata,
136                                                sizeof(ehci_pdata));
137         if (ret)
138                 goto err_alloc;
139         ret = platform_device_add(hci_dev);
140         if (ret)
141                 goto err_alloc;
142 
143         return hci_dev;
144 
145 err_alloc:
146         platform_device_put(hci_dev);
147         return ERR_PTR(ret);
148 }
149 
150 static int ssb_hcd_probe(struct ssb_device *dev,
151                                    const struct ssb_device_id *id)
152 {
153         int err, tmp;
154         int start, len;
155         u16 chipid_top;
156         u16 coreid = dev->id.coreid;
157         struct ssb_hcd_device *usb_dev;
158 
159         /* USBcores are only connected on embedded devices. */
160         chipid_top = (dev->bus->chip_id & 0xFF00);
161         if (chipid_top != 0x4700 && chipid_top != 0x5300)
162                 return -ENODEV;
163 
164         /* TODO: Probably need checks here; is the core connected? */
165 
166         if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
167                 return -EOPNOTSUPP;
168 
169         usb_dev = kzalloc(sizeof(struct ssb_hcd_device), GFP_KERNEL);
170         if (!usb_dev)
171                 return -ENOMEM;
172 
173         /* We currently always attach SSB_DEV_USB11_HOSTDEV
174          * as HOST OHCI. If we want to attach it as Client device,
175          * we must branch here and call into the (yet to
176          * be written) Client mode driver. Same for remove(). */
177         usb_dev->enable_flags = ssb_hcd_init_chip(dev);
178 
179         tmp = ssb_read32(dev, SSB_ADMATCH0);
180 
181         start = ssb_admatch_base(tmp);
182         len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
183         usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
184         if (IS_ERR(usb_dev->ohci_dev)) {
185                 err = PTR_ERR(usb_dev->ohci_dev);
186                 goto err_free_usb_dev;
187         }
188 
189         if (coreid == SSB_DEV_USB20_HOST) {
190                 start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
191                 usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
192                 if (IS_ERR(usb_dev->ehci_dev)) {
193                         err = PTR_ERR(usb_dev->ehci_dev);
194                         goto err_unregister_ohci_dev;
195                 }
196         }
197 
198         ssb_set_drvdata(dev, usb_dev);
199         return 0;
200 
201 err_unregister_ohci_dev:
202         platform_device_unregister(usb_dev->ohci_dev);
203 err_free_usb_dev:
204         kfree(usb_dev);
205         return err;
206 }
207 
208 static void ssb_hcd_remove(struct ssb_device *dev)
209 {
210         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
211         struct platform_device *ohci_dev = usb_dev->ohci_dev;
212         struct platform_device *ehci_dev = usb_dev->ehci_dev;
213 
214         if (ohci_dev)
215                 platform_device_unregister(ohci_dev);
216         if (ehci_dev)
217                 platform_device_unregister(ehci_dev);
218 
219         ssb_device_disable(dev, 0);
220 }
221 
222 static void ssb_hcd_shutdown(struct ssb_device *dev)
223 {
224         ssb_device_disable(dev, 0);
225 }
226 
227 #ifdef CONFIG_PM
228 
229 static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state)
230 {
231         ssb_device_disable(dev, 0);
232 
233         return 0;
234 }
235 
236 static int ssb_hcd_resume(struct ssb_device *dev)
237 {
238         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
239 
240         ssb_device_enable(dev, usb_dev->enable_flags);
241 
242         return 0;
243 }
244 
245 #else /* !CONFIG_PM */
246 #define ssb_hcd_suspend NULL
247 #define ssb_hcd_resume  NULL
248 #endif /* CONFIG_PM */
249 
250 static const struct ssb_device_id ssb_hcd_table[] = {
251         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
252         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
253         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
254         SSB_DEVTABLE_END
255 };
256 MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);
257 
258 static struct ssb_driver ssb_hcd_driver = {
259         .name           = KBUILD_MODNAME,
260         .id_table       = ssb_hcd_table,
261         .probe          = ssb_hcd_probe,
262         .remove         = ssb_hcd_remove,
263         .shutdown       = ssb_hcd_shutdown,
264         .suspend        = ssb_hcd_suspend,
265         .resume         = ssb_hcd_resume,
266 };
267 
268 static int __init ssb_hcd_init(void)
269 {
270         return ssb_driver_register(&ssb_hcd_driver);
271 }
272 module_init(ssb_hcd_init);
273 
274 static void __exit ssb_hcd_exit(void)
275 {
276         ssb_driver_unregister(&ssb_hcd_driver);
277 }
278 module_exit(ssb_hcd_exit);
279 

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