Revert "NET: Fix locking issues in PPP, 6pack, mkiss and strip line disciplines."
[linux-2.6] / drivers / ssb / driver_gige.c
1 /*
2  * Sonics Silicon Backplane
3  * Broadcom Gigabit Ethernet core driver
4  *
5  * Copyright 2008, Broadcom Corporation
6  * Copyright 2008, Michael Buesch <mb@bu3sch.de>
7  *
8  * Licensed under the GNU/GPL. See COPYING for details.
9  */
10
11 #include <linux/ssb/ssb.h>
12 #include <linux/ssb/ssb_driver_gige.h>
13 #include <linux/pci.h>
14 #include <linux/pci_regs.h>
15
16
17 /*
18 MODULE_DESCRIPTION("SSB Broadcom Gigabit Ethernet driver");
19 MODULE_AUTHOR("Michael Buesch");
20 MODULE_LICENSE("GPL");
21 */
22
23 static const struct ssb_device_id ssb_gige_tbl[] = {
24         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_ETHERNET_GBIT, SSB_ANY_REV),
25         SSB_DEVTABLE_END
26 };
27 /* MODULE_DEVICE_TABLE(ssb, ssb_gige_tbl); */
28
29
30 static inline u8 gige_read8(struct ssb_gige *dev, u16 offset)
31 {
32         return ssb_read8(dev->dev, offset);
33 }
34
35 static inline u16 gige_read16(struct ssb_gige *dev, u16 offset)
36 {
37         return ssb_read16(dev->dev, offset);
38 }
39
40 static inline u32 gige_read32(struct ssb_gige *dev, u16 offset)
41 {
42         return ssb_read32(dev->dev, offset);
43 }
44
45 static inline void gige_write8(struct ssb_gige *dev,
46                                u16 offset, u8 value)
47 {
48         ssb_write8(dev->dev, offset, value);
49 }
50
51 static inline void gige_write16(struct ssb_gige *dev,
52                                 u16 offset, u16 value)
53 {
54         ssb_write16(dev->dev, offset, value);
55 }
56
57 static inline void gige_write32(struct ssb_gige *dev,
58                                 u16 offset, u32 value)
59 {
60         ssb_write32(dev->dev, offset, value);
61 }
62
63 static inline
64 u8 gige_pcicfg_read8(struct ssb_gige *dev, unsigned int offset)
65 {
66         BUG_ON(offset >= 256);
67         return gige_read8(dev, SSB_GIGE_PCICFG + offset);
68 }
69
70 static inline
71 u16 gige_pcicfg_read16(struct ssb_gige *dev, unsigned int offset)
72 {
73         BUG_ON(offset >= 256);
74         return gige_read16(dev, SSB_GIGE_PCICFG + offset);
75 }
76
77 static inline
78 u32 gige_pcicfg_read32(struct ssb_gige *dev, unsigned int offset)
79 {
80         BUG_ON(offset >= 256);
81         return gige_read32(dev, SSB_GIGE_PCICFG + offset);
82 }
83
84 static inline
85 void gige_pcicfg_write8(struct ssb_gige *dev,
86                         unsigned int offset, u8 value)
87 {
88         BUG_ON(offset >= 256);
89         gige_write8(dev, SSB_GIGE_PCICFG + offset, value);
90 }
91
92 static inline
93 void gige_pcicfg_write16(struct ssb_gige *dev,
94                          unsigned int offset, u16 value)
95 {
96         BUG_ON(offset >= 256);
97         gige_write16(dev, SSB_GIGE_PCICFG + offset, value);
98 }
99
100 static inline
101 void gige_pcicfg_write32(struct ssb_gige *dev,
102                          unsigned int offset, u32 value)
103 {
104         BUG_ON(offset >= 256);
105         gige_write32(dev, SSB_GIGE_PCICFG + offset, value);
106 }
107
108 static int ssb_gige_pci_read_config(struct pci_bus *bus, unsigned int devfn,
109                                     int reg, int size, u32 *val)
110 {
111         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
112         unsigned long flags;
113
114         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
115                 return PCIBIOS_DEVICE_NOT_FOUND;
116         if (reg >= 256)
117                 return PCIBIOS_DEVICE_NOT_FOUND;
118
119         spin_lock_irqsave(&dev->lock, flags);
120         switch (size) {
121         case 1:
122                 *val = gige_pcicfg_read8(dev, reg);
123                 break;
124         case 2:
125                 *val = gige_pcicfg_read16(dev, reg);
126                 break;
127         case 4:
128                 *val = gige_pcicfg_read32(dev, reg);
129                 break;
130         default:
131                 WARN_ON(1);
132         }
133         spin_unlock_irqrestore(&dev->lock, flags);
134
135         return PCIBIOS_SUCCESSFUL;
136 }
137
138 static int ssb_gige_pci_write_config(struct pci_bus *bus, unsigned int devfn,
139                                      int reg, int size, u32 val)
140 {
141         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
142         unsigned long flags;
143
144         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
145                 return PCIBIOS_DEVICE_NOT_FOUND;
146         if (reg >= 256)
147                 return PCIBIOS_DEVICE_NOT_FOUND;
148
149         spin_lock_irqsave(&dev->lock, flags);
150         switch (size) {
151         case 1:
152                 gige_pcicfg_write8(dev, reg, val);
153                 break;
154         case 2:
155                 gige_pcicfg_write16(dev, reg, val);
156                 break;
157         case 4:
158                 gige_pcicfg_write32(dev, reg, val);
159                 break;
160         default:
161                 WARN_ON(1);
162         }
163         spin_unlock_irqrestore(&dev->lock, flags);
164
165         return PCIBIOS_SUCCESSFUL;
166 }
167
168 static int ssb_gige_probe(struct ssb_device *sdev, const struct ssb_device_id *id)
169 {
170         struct ssb_gige *dev;
171         u32 base, tmslow, tmshigh;
172
173         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
174         if (!dev)
175                 return -ENOMEM;
176         dev->dev = sdev;
177
178         spin_lock_init(&dev->lock);
179         dev->pci_controller.pci_ops = &dev->pci_ops;
180         dev->pci_controller.io_resource = &dev->io_resource;
181         dev->pci_controller.mem_resource = &dev->mem_resource;
182         dev->pci_controller.io_map_base = 0x800;
183         dev->pci_ops.read = ssb_gige_pci_read_config;
184         dev->pci_ops.write = ssb_gige_pci_write_config;
185
186         dev->io_resource.name = SSB_GIGE_IO_RES_NAME;
187         dev->io_resource.start = 0x800;
188         dev->io_resource.end = 0x8FF;
189         dev->io_resource.flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED;
190
191         if (!ssb_device_is_enabled(sdev))
192                 ssb_device_enable(sdev, 0);
193
194         /* Setup BAR0. This is a 64k MMIO region. */
195         base = ssb_admatch_base(ssb_read32(sdev, SSB_ADMATCH1));
196         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_0, base);
197         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_1, 0);
198
199         dev->mem_resource.name = SSB_GIGE_MEM_RES_NAME;
200         dev->mem_resource.start = base;
201         dev->mem_resource.end = base + 0x10000 - 1;
202         dev->mem_resource.flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
203
204         /* Enable the memory region. */
205         gige_pcicfg_write16(dev, PCI_COMMAND,
206                             gige_pcicfg_read16(dev, PCI_COMMAND)
207                             | PCI_COMMAND_MEMORY);
208
209         /* Write flushing is controlled by the Flush Status Control register.
210          * We want to flush every register write with a timeout and we want
211          * to disable the IRQ mask while flushing to avoid concurrency.
212          * Note that automatic write flushing does _not_ work from
213          * an IRQ handler. The driver must flush manually by reading a register.
214          */
215         gige_write32(dev, SSB_GIGE_SHIM_FLUSHSTAT, 0x00000068);
216
217         /* Check if we have an RGMII or GMII PHY-bus.
218          * On RGMII do not bypass the DLLs */
219         tmslow = ssb_read32(sdev, SSB_TMSLOW);
220         tmshigh = ssb_read32(sdev, SSB_TMSHIGH);
221         if (tmshigh & SSB_GIGE_TMSHIGH_RGMII) {
222                 tmslow &= ~SSB_GIGE_TMSLOW_TXBYPASS;
223                 tmslow &= ~SSB_GIGE_TMSLOW_RXBYPASS;
224                 dev->has_rgmii = 1;
225         } else {
226                 tmslow |= SSB_GIGE_TMSLOW_TXBYPASS;
227                 tmslow |= SSB_GIGE_TMSLOW_RXBYPASS;
228                 dev->has_rgmii = 0;
229         }
230         tmslow |= SSB_GIGE_TMSLOW_DLLEN;
231         ssb_write32(sdev, SSB_TMSLOW, tmslow);
232
233         ssb_set_drvdata(sdev, dev);
234         register_pci_controller(&dev->pci_controller);
235
236         return 0;
237 }
238
239 bool pdev_is_ssb_gige_core(struct pci_dev *pdev)
240 {
241         if (!pdev->resource[0].name)
242                 return 0;
243         return (strcmp(pdev->resource[0].name, SSB_GIGE_MEM_RES_NAME) == 0);
244 }
245 EXPORT_SYMBOL(pdev_is_ssb_gige_core);
246
247 int ssb_gige_pcibios_plat_dev_init(struct ssb_device *sdev,
248                                    struct pci_dev *pdev)
249 {
250         struct ssb_gige *dev = ssb_get_drvdata(sdev);
251         struct resource *res;
252
253         if (pdev->bus->ops != &dev->pci_ops) {
254                 /* The PCI device is not on this SSB GigE bridge device. */
255                 return -ENODEV;
256         }
257
258         /* Fixup the PCI resources. */
259         res = &(pdev->resource[0]);
260         res->flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
261         res->name = dev->mem_resource.name;
262         res->start = dev->mem_resource.start;
263         res->end = dev->mem_resource.end;
264
265         /* Fixup interrupt lines. */
266         pdev->irq = ssb_mips_irq(sdev) + 2;
267         pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, pdev->irq);
268
269         return 0;
270 }
271
272 int ssb_gige_map_irq(struct ssb_device *sdev,
273                      const struct pci_dev *pdev)
274 {
275         struct ssb_gige *dev = ssb_get_drvdata(sdev);
276
277         if (pdev->bus->ops != &dev->pci_ops) {
278                 /* The PCI device is not on this SSB GigE bridge device. */
279                 return -ENODEV;
280         }
281
282         return ssb_mips_irq(sdev) + 2;
283 }
284
285 static struct ssb_driver ssb_gige_driver = {
286         .name           = "BCM-GigE",
287         .id_table       = ssb_gige_tbl,
288         .probe          = ssb_gige_probe,
289 };
290
291 int ssb_gige_init(void)
292 {
293         return ssb_driver_register(&ssb_gige_driver);
294 }