Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / 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 <m@bues.ch>
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/export.h>
14 #include <linux/pci.h>
15 #include <linux/pci_regs.h>
16 #include <linux/slab.h>
17
18
19 /*
20 MODULE_DESCRIPTION("SSB Broadcom Gigabit Ethernet driver");
21 MODULE_AUTHOR("Michael Buesch");
22 MODULE_LICENSE("GPL");
23 */
24
25 static const struct ssb_device_id ssb_gige_tbl[] = {
26         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_ETHERNET_GBIT, SSB_ANY_REV),
27         SSB_DEVTABLE_END
28 };
29 /* MODULE_DEVICE_TABLE(ssb, ssb_gige_tbl); */
30
31
32 static inline u8 gige_read8(struct ssb_gige *dev, u16 offset)
33 {
34         return ssb_read8(dev->dev, offset);
35 }
36
37 static inline u16 gige_read16(struct ssb_gige *dev, u16 offset)
38 {
39         return ssb_read16(dev->dev, offset);
40 }
41
42 static inline u32 gige_read32(struct ssb_gige *dev, u16 offset)
43 {
44         return ssb_read32(dev->dev, offset);
45 }
46
47 static inline void gige_write8(struct ssb_gige *dev,
48                                u16 offset, u8 value)
49 {
50         ssb_write8(dev->dev, offset, value);
51 }
52
53 static inline void gige_write16(struct ssb_gige *dev,
54                                 u16 offset, u16 value)
55 {
56         ssb_write16(dev->dev, offset, value);
57 }
58
59 static inline void gige_write32(struct ssb_gige *dev,
60                                 u16 offset, u32 value)
61 {
62         ssb_write32(dev->dev, offset, value);
63 }
64
65 static inline
66 u8 gige_pcicfg_read8(struct ssb_gige *dev, unsigned int offset)
67 {
68         BUG_ON(offset >= 256);
69         return gige_read8(dev, SSB_GIGE_PCICFG + offset);
70 }
71
72 static inline
73 u16 gige_pcicfg_read16(struct ssb_gige *dev, unsigned int offset)
74 {
75         BUG_ON(offset >= 256);
76         return gige_read16(dev, SSB_GIGE_PCICFG + offset);
77 }
78
79 static inline
80 u32 gige_pcicfg_read32(struct ssb_gige *dev, unsigned int offset)
81 {
82         BUG_ON(offset >= 256);
83         return gige_read32(dev, SSB_GIGE_PCICFG + offset);
84 }
85
86 static inline
87 void gige_pcicfg_write8(struct ssb_gige *dev,
88                         unsigned int offset, u8 value)
89 {
90         BUG_ON(offset >= 256);
91         gige_write8(dev, SSB_GIGE_PCICFG + offset, value);
92 }
93
94 static inline
95 void gige_pcicfg_write16(struct ssb_gige *dev,
96                          unsigned int offset, u16 value)
97 {
98         BUG_ON(offset >= 256);
99         gige_write16(dev, SSB_GIGE_PCICFG + offset, value);
100 }
101
102 static inline
103 void gige_pcicfg_write32(struct ssb_gige *dev,
104                          unsigned int offset, u32 value)
105 {
106         BUG_ON(offset >= 256);
107         gige_write32(dev, SSB_GIGE_PCICFG + offset, value);
108 }
109
110 static int ssb_gige_pci_read_config(struct pci_bus *bus, unsigned int devfn,
111                                     int reg, int size, u32 *val)
112 {
113         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
114         unsigned long flags;
115
116         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
117                 return PCIBIOS_DEVICE_NOT_FOUND;
118         if (reg >= 256)
119                 return PCIBIOS_DEVICE_NOT_FOUND;
120
121         spin_lock_irqsave(&dev->lock, flags);
122         switch (size) {
123         case 1:
124                 *val = gige_pcicfg_read8(dev, reg);
125                 break;
126         case 2:
127                 *val = gige_pcicfg_read16(dev, reg);
128                 break;
129         case 4:
130                 *val = gige_pcicfg_read32(dev, reg);
131                 break;
132         default:
133                 WARN_ON(1);
134         }
135         spin_unlock_irqrestore(&dev->lock, flags);
136
137         return PCIBIOS_SUCCESSFUL;
138 }
139
140 static int ssb_gige_pci_write_config(struct pci_bus *bus, unsigned int devfn,
141                                      int reg, int size, u32 val)
142 {
143         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
144         unsigned long flags;
145
146         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
147                 return PCIBIOS_DEVICE_NOT_FOUND;
148         if (reg >= 256)
149                 return PCIBIOS_DEVICE_NOT_FOUND;
150
151         spin_lock_irqsave(&dev->lock, flags);
152         switch (size) {
153         case 1:
154                 gige_pcicfg_write8(dev, reg, val);
155                 break;
156         case 2:
157                 gige_pcicfg_write16(dev, reg, val);
158                 break;
159         case 4:
160                 gige_pcicfg_write32(dev, reg, val);
161                 break;
162         default:
163                 WARN_ON(1);
164         }
165         spin_unlock_irqrestore(&dev->lock, flags);
166
167         return PCIBIOS_SUCCESSFUL;
168 }
169
170 static int ssb_gige_probe(struct ssb_device *sdev,
171                           const struct ssb_device_id *id)
172 {
173         struct ssb_gige *dev;
174         u32 base, tmslow, tmshigh;
175
176         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
177         if (!dev)
178                 return -ENOMEM;
179         dev->dev = sdev;
180
181         spin_lock_init(&dev->lock);
182         dev->pci_controller.pci_ops = &dev->pci_ops;
183         dev->pci_controller.io_resource = &dev->io_resource;
184         dev->pci_controller.mem_resource = &dev->mem_resource;
185         dev->pci_controller.io_map_base = 0x800;
186         dev->pci_ops.read = ssb_gige_pci_read_config;
187         dev->pci_ops.write = ssb_gige_pci_write_config;
188
189         dev->io_resource.name = SSB_GIGE_IO_RES_NAME;
190         dev->io_resource.start = 0x800;
191         dev->io_resource.end = 0x8FF;
192         dev->io_resource.flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED;
193
194         if (!ssb_device_is_enabled(sdev))
195                 ssb_device_enable(sdev, 0);
196
197         /* Setup BAR0. This is a 64k MMIO region. */
198         base = ssb_admatch_base(ssb_read32(sdev, SSB_ADMATCH1));
199         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_0, base);
200         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_1, 0);
201
202         dev->mem_resource.name = SSB_GIGE_MEM_RES_NAME;
203         dev->mem_resource.start = base;
204         dev->mem_resource.end = base + 0x10000 - 1;
205         dev->mem_resource.flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
206
207         /* Enable the memory region. */
208         gige_pcicfg_write16(dev, PCI_COMMAND,
209                             gige_pcicfg_read16(dev, PCI_COMMAND)
210                             | PCI_COMMAND_MEMORY);
211
212         /* Write flushing is controlled by the Flush Status Control register.
213          * We want to flush every register write with a timeout and we want
214          * to disable the IRQ mask while flushing to avoid concurrency.
215          * Note that automatic write flushing does _not_ work from
216          * an IRQ handler. The driver must flush manually by reading a register.
217          */
218         gige_write32(dev, SSB_GIGE_SHIM_FLUSHSTAT, 0x00000068);
219
220         /* Check if we have an RGMII or GMII PHY-bus.
221          * On RGMII do not bypass the DLLs */
222         tmslow = ssb_read32(sdev, SSB_TMSLOW);
223         tmshigh = ssb_read32(sdev, SSB_TMSHIGH);
224         if (tmshigh & SSB_GIGE_TMSHIGH_RGMII) {
225                 tmslow &= ~SSB_GIGE_TMSLOW_TXBYPASS;
226                 tmslow &= ~SSB_GIGE_TMSLOW_RXBYPASS;
227                 dev->has_rgmii = 1;
228         } else {
229                 tmslow |= SSB_GIGE_TMSLOW_TXBYPASS;
230                 tmslow |= SSB_GIGE_TMSLOW_RXBYPASS;
231                 dev->has_rgmii = 0;
232         }
233         tmslow |= SSB_GIGE_TMSLOW_DLLEN;
234         ssb_write32(sdev, SSB_TMSLOW, tmslow);
235
236         ssb_set_drvdata(sdev, dev);
237         register_pci_controller(&dev->pci_controller);
238
239         return 0;
240 }
241
242 bool pdev_is_ssb_gige_core(struct pci_dev *pdev)
243 {
244         if (!pdev->resource[0].name)
245                 return 0;
246         return (strcmp(pdev->resource[0].name, SSB_GIGE_MEM_RES_NAME) == 0);
247 }
248 EXPORT_SYMBOL(pdev_is_ssb_gige_core);
249
250 int ssb_gige_pcibios_plat_dev_init(struct ssb_device *sdev,
251                                    struct pci_dev *pdev)
252 {
253         struct ssb_gige *dev = ssb_get_drvdata(sdev);
254         struct resource *res;
255
256         if (pdev->bus->ops != &dev->pci_ops) {
257                 /* The PCI device is not on this SSB GigE bridge device. */
258                 return -ENODEV;
259         }
260
261         /* Fixup the PCI resources. */
262         res = &(pdev->resource[0]);
263         res->flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
264         res->name = dev->mem_resource.name;
265         res->start = dev->mem_resource.start;
266         res->end = dev->mem_resource.end;
267
268         /* Fixup interrupt lines. */
269         pdev->irq = ssb_mips_irq(sdev) + 2;
270         pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, pdev->irq);
271
272         return 0;
273 }
274
275 int ssb_gige_map_irq(struct ssb_device *sdev,
276                      const struct pci_dev *pdev)
277 {
278         struct ssb_gige *dev = ssb_get_drvdata(sdev);
279
280         if (pdev->bus->ops != &dev->pci_ops) {
281                 /* The PCI device is not on this SSB GigE bridge device. */
282                 return -ENODEV;
283         }
284
285         return ssb_mips_irq(sdev) + 2;
286 }
287
288 static struct ssb_driver ssb_gige_driver = {
289         .name           = "BCM-GigE",
290         .id_table       = ssb_gige_tbl,
291         .probe          = ssb_gige_probe,
292 };
293
294 int ssb_gige_init(void)
295 {
296         return ssb_driver_register(&ssb_gige_driver);
297 }