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ACPI: basic initramfs DSDT override support
[linux-2.6/sactl.git] / drivers / ssb / driver_pcicore.c
blob2faaa906d5d6bf98375728ee9af2b47f10e29e7c
1 /*
2 * Sonics Silicon Backplane
3 * Broadcom PCI-core driver
4 *
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, 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/pci.h>
13 #include <linux/delay.h>
14
15 #include "ssb_private.h"
16
17
18 static inline
19 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
20 {
21 return ssb_read32(pc->dev, offset);
22 }
23
24 static inline
25 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
26 {
27 ssb_write32(pc->dev, offset, value);
28 }
29
30 /**************************************************
31 * Code for hostmode operation.
32 **************************************************/
33
34 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
35
36 #include <asm/paccess.h>
37 /* Probe a 32bit value on the bus and catch bus exceptions.
38 * Returns nonzero on a bus exception.
39 * This is MIPS specific */
40 #define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))
41
42 /* Assume one-hot slot wiring */
43 #define SSB_PCI_SLOT_MAX 16
44
45 /* Global lock is OK, as we won't have more than one extpci anyway. */
46 static DEFINE_SPINLOCK(cfgspace_lock);
47 /* Core to access the external PCI config space. Can only have one. */
48 static struct ssb_pcicore *extpci_core;
49
50 static u32 ssb_pcicore_pcibus_iobase = 0x100;
51 static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA;
52
53 int pcibios_plat_dev_init(struct pci_dev *d)
54 {
55 struct resource *res;
56 int pos, size;
57 u32 *base;
58
59 ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
60 pci_name(d));
61
62 /* Fix up resource bases */
63 for (pos = 0; pos < 6; pos++) {
64 res = &d->resource[pos];
65 if (res->flags & IORESOURCE_IO)
66 base = &ssb_pcicore_pcibus_iobase;
67 else
68 base = &ssb_pcicore_pcibus_membase;
69 if (res->end) {
70 size = res->end - res->start + 1;
71 if (*base & (size - 1))
72 *base = (*base + size) & ~(size - 1);
73 res->start = *base;
74 res->end = res->start + size - 1;
75 *base += size;
76 pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start);
77 }
78 /* Fix up PCI bridge BAR0 only */
79 if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0)
80 break;
81 }
82 /* Fix up interrupt lines */
83 d->irq = ssb_mips_irq(extpci_core->dev) + 2;
84 pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
85
86 return 0;
87 }
88
89 static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
90 {
91 if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
92 return;
93
94 ssb_printk(KERN_INFO "PCI: fixing up bridge\n");
95
96 /* Enable PCI bridge bus mastering and memory space */
97 pci_set_master(dev);
98 pcibios_enable_device(dev, ~0);
99
100 /* Enable PCI bridge BAR1 prefetch and burst */
101 pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
102
103 /* Make sure our latency is high enough to handle the devices behind us */
104 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xa8);
105 }
106 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge);
107
108 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
109 {
110 return ssb_mips_irq(extpci_core->dev) + 2;
111 }
112
113 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
114 unsigned int bus, unsigned int dev,
115 unsigned int func, unsigned int off)
116 {
117 u32 addr = 0;
118 u32 tmp;
119
120 if (unlikely(pc->cardbusmode && dev > 1))
121 goto out;
122 if (bus == 0) {
123 /* Type 0 transaction */
124 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
125 goto out;
126 /* Slide the window */
127 tmp = SSB_PCICORE_SBTOPCI_CFG0;
128 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
129 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
130 /* Calculate the address */
131 addr = SSB_PCI_CFG;
132 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
133 addr |= (func << 8);
134 addr |= (off & ~3);
135 } else {
136 /* Type 1 transaction */
137 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
138 SSB_PCICORE_SBTOPCI_CFG1);
139 /* Calculate the address */
140 addr = SSB_PCI_CFG;
141 addr |= (bus << 16);
142 addr |= (dev << 11);
143 addr |= (func << 8);
144 addr |= (off & ~3);
145 }
146 out:
147 return addr;
148 }
149
150 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
151 unsigned int bus, unsigned int dev,
152 unsigned int func, unsigned int off,
153 void *buf, int len)
154 {
155 int err = -EINVAL;
156 u32 addr, val;
157 void __iomem *mmio;
158
159 SSB_WARN_ON(!pc->hostmode);
160 if (unlikely(len != 1 && len != 2 && len != 4))
161 goto out;
162 addr = get_cfgspace_addr(pc, bus, dev, func, off);
163 if (unlikely(!addr))
164 goto out;
165 err = -ENOMEM;
166 mmio = ioremap_nocache(addr, len);
167 if (!mmio)
168 goto out;
169
170 if (mips_busprobe32(val, mmio)) {
171 val = 0xffffffff;
172 goto unmap;
173 }
174
175 val = readl(mmio);
176 val >>= (8 * (off & 3));
177
178 switch (len) {
179 case 1:
180 *((u8 *)buf) = (u8)val;
181 break;
182 case 2:
183 *((u16 *)buf) = (u16)val;
184 break;
185 case 4:
186 *((u32 *)buf) = (u32)val;
187 break;
188 }
189 err = 0;
190 unmap:
191 iounmap(mmio);
192 out:
193 return err;
194 }
195
196 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
197 unsigned int bus, unsigned int dev,
198 unsigned int func, unsigned int off,
199 const void *buf, int len)
200 {
201 int err = -EINVAL;
202 u32 addr, val = 0;
203 void __iomem *mmio;
204
205 SSB_WARN_ON(!pc->hostmode);
206 if (unlikely(len != 1 && len != 2 && len != 4))
207 goto out;
208 addr = get_cfgspace_addr(pc, bus, dev, func, off);
209 if (unlikely(!addr))
210 goto out;
211 err = -ENOMEM;
212 mmio = ioremap_nocache(addr, len);
213 if (!mmio)
214 goto out;
215
216 if (mips_busprobe32(val, mmio)) {
217 val = 0xffffffff;
218 goto unmap;
219 }
220
221 switch (len) {
222 case 1:
223 val = readl(mmio);
224 val &= ~(0xFF << (8 * (off & 3)));
225 val |= *((const u8 *)buf) << (8 * (off & 3));
226 break;
227 case 2:
228 val = readl(mmio);
229 val &= ~(0xFFFF << (8 * (off & 3)));
230 val |= *((const u16 *)buf) << (8 * (off & 3));
231 break;
232 case 4:
233 val = *((const u32 *)buf);
234 break;
235 }
236 writel(val, mmio);
237
238 err = 0;
239 unmap:
240 iounmap(mmio);
241 out:
242 return err;
243 }
244
245 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
246 int reg, int size, u32 *val)
247 {
248 unsigned long flags;
249 int err;
250
251 spin_lock_irqsave(&cfgspace_lock, flags);
252 err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
253 PCI_FUNC(devfn), reg, val, size);
254 spin_unlock_irqrestore(&cfgspace_lock, flags);
255
256 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
257 }
258
259 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
260 int reg, int size, u32 val)
261 {
262 unsigned long flags;
263 int err;
264
265 spin_lock_irqsave(&cfgspace_lock, flags);
266 err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
267 PCI_FUNC(devfn), reg, &val, size);
268 spin_unlock_irqrestore(&cfgspace_lock, flags);
269
270 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
271 }
272
273 static struct pci_ops ssb_pcicore_pciops = {
274 .read = ssb_pcicore_read_config,
275 .write = ssb_pcicore_write_config,
276 };
277
278 static struct resource ssb_pcicore_mem_resource = {
279 .name = "SSB PCIcore external memory",
280 .start = SSB_PCI_DMA,
281 .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
282 .flags = IORESOURCE_MEM,
283 };
284
285 static struct resource ssb_pcicore_io_resource = {
286 .name = "SSB PCIcore external I/O",
287 .start = 0x100,
288 .end = 0x7FF,
289 .flags = IORESOURCE_IO,
290 };
291
292 static struct pci_controller ssb_pcicore_controller = {
293 .pci_ops = &ssb_pcicore_pciops,
294 .io_resource = &ssb_pcicore_io_resource,
295 .mem_resource = &ssb_pcicore_mem_resource,
296 .mem_offset = 0x24000000,
297 };
298
299 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
300 {
301 u32 val;
302
303 if (WARN_ON(extpci_core))
304 return;
305 extpci_core = pc;
306
307 ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
308 /* Reset devices on the external PCI bus */
309 val = SSB_PCICORE_CTL_RST_OE;
310 val |= SSB_PCICORE_CTL_CLK_OE;
311 pcicore_write32(pc, SSB_PCICORE_CTL, val);
312 val |= SSB_PCICORE_CTL_CLK; /* Clock on */
313 pcicore_write32(pc, SSB_PCICORE_CTL, val);
314 udelay(150); /* Assertion time demanded by the PCI standard */
315 val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
316 pcicore_write32(pc, SSB_PCICORE_CTL, val);
317 val = SSB_PCICORE_ARBCTL_INTERN;
318 pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
319 udelay(1); /* Assertion time demanded by the PCI standard */
320
321 /*TODO cardbus mode */
322
323 /* 64MB I/O window */
324 pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
325 SSB_PCICORE_SBTOPCI_IO);
326 /* 64MB config space */
327 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
328 SSB_PCICORE_SBTOPCI_CFG0);
329 /* 1GB memory window */
330 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
331 SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
332
333 /* Enable PCI bridge BAR0 prefetch and burst */
334 val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
335 ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
336 /* Clear error conditions */
337 val = 0;
338 ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
339
340 /* Enable PCI interrupts */
341 pcicore_write32(pc, SSB_PCICORE_IMASK,
342 SSB_PCICORE_IMASK_INTA);
343
344 /* Ok, ready to run, register it to the system.
345 * The following needs change, if we want to port hostmode
346 * to non-MIPS platform. */
347 set_io_port_base((unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000));
348 /* Give some time to the PCI controller to configure itself with the new
349 * values. Not waiting at this point causes crashes of the machine. */
350 mdelay(10);
351 register_pci_controller(&ssb_pcicore_controller);
352 }
353
354 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
355 {
356 struct ssb_bus *bus = pc->dev->bus;
357 u16 chipid_top;
358 u32 tmp;
359
360 chipid_top = (bus->chip_id & 0xFF00);
361 if (chipid_top != 0x4700 &&
362 chipid_top != 0x5300)
363 return 0;
364
365 if (bus->sprom.r1.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
366 return 0;
367
368 /* The 200-pin BCM4712 package does not bond out PCI. Even when
369 * PCI is bonded out, some boards may leave the pins floating. */
370 if (bus->chip_id == 0x4712) {
371 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
372 return 0;
373 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
374 return 0;
375 }
376 if (bus->chip_id == 0x5350)
377 return 0;
378
379 return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
380 }
381 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
382
383
384 /**************************************************
385 * Generic and Clientmode operation code.
386 **************************************************/
387
388 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
389 {
390 /* Disable PCI interrupts. */
391 ssb_write32(pc->dev, SSB_INTVEC, 0);
392 }
393
394 void ssb_pcicore_init(struct ssb_pcicore *pc)
395 {
396 struct ssb_device *dev = pc->dev;
397 struct ssb_bus *bus;
398
399 if (!dev)
400 return;
401 bus = dev->bus;
402 if (!ssb_device_is_enabled(dev))
403 ssb_device_enable(dev, 0);
404
405 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
406 pc->hostmode = pcicore_is_in_hostmode(pc);
407 if (pc->hostmode)
408 ssb_pcicore_init_hostmode(pc);
409 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
410 if (!pc->hostmode)
411 ssb_pcicore_init_clientmode(pc);
412 }
413
414 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
415 {
416 pcicore_write32(pc, 0x130, address);
417 return pcicore_read32(pc, 0x134);
418 }
419
420 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
421 {
422 pcicore_write32(pc, 0x130, address);
423 pcicore_write32(pc, 0x134, data);
424 }
425
426 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
427 u8 address, u16 data)
428 {
429 const u16 mdio_control = 0x128;
430 const u16 mdio_data = 0x12C;
431 u32 v;
432 int i;
433
434 v = 0x80; /* Enable Preamble Sequence */
435 v |= 0x2; /* MDIO Clock Divisor */
436 pcicore_write32(pc, mdio_control, v);
437
438 v = (1 << 30); /* Start of Transaction */
439 v |= (1 << 28); /* Write Transaction */
440 v |= (1 << 17); /* Turnaround */
441 v |= (u32)device << 22;
442 v |= (u32)address << 18;
443 v |= data;
444 pcicore_write32(pc, mdio_data, v);
445 /* Wait for the device to complete the transaction */
446 udelay(10);
447 for (i = 0; i < 10; i++) {
448 v = pcicore_read32(pc, mdio_control);
449 if (v & 0x100 /* Trans complete */)
450 break;
451 msleep(1);
452 }
453 pcicore_write32(pc, mdio_control, 0);
454 }
455
456 static void ssb_broadcast_value(struct ssb_device *dev,
457 u32 address, u32 data)
458 {
459 /* This is used for both, PCI and ChipCommon core, so be careful. */
460 BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
461 BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
462
463 ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
464 ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
465 ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
466 ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
467 }
468
469 static void ssb_commit_settings(struct ssb_bus *bus)
470 {
471 struct ssb_device *dev;
472
473 dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
474 if (WARN_ON(!dev))
475 return;
476 /* This forces an update of the cached registers. */
477 ssb_broadcast_value(dev, 0xFD8, 0);
478 }
479
480 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
481 struct ssb_device *dev)
482 {
483 struct ssb_device *pdev = pc->dev;
484 struct ssb_bus *bus;
485 int err = 0;
486 u32 tmp;
487
488 might_sleep();
489
490 if (!pdev)
491 goto out;
492 bus = pdev->bus;
493
494 /* Enable interrupts for this device. */
495 if (bus->host_pci &&
496 ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE))) {
497 u32 coremask;
498
499 /* Calculate the "coremask" for the device. */
500 coremask = (1 << dev->core_index);
501
502 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
503 if (err)
504 goto out;
505 tmp |= coremask << 8;
506 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
507 if (err)
508 goto out;
509 } else {
510 u32 intvec;
511
512 intvec = ssb_read32(pdev, SSB_INTVEC);
513 if ((bus->chip_id & 0xFF00) == 0x4400) {
514 /* Workaround: On the BCM44XX the BPFLAG routing
515 * bit is wrong. Use a hardcoded constant. */
516 intvec |= 0x00000002;
517 } else {
518 tmp = ssb_read32(dev, SSB_TPSFLAG);
519 tmp &= SSB_TPSFLAG_BPFLAG;
520 intvec |= tmp;
521 }
522 ssb_write32(pdev, SSB_INTVEC, intvec);
523 }
524
525 /* Setup PCIcore operation. */
526 if (pc->setup_done)
527 goto out;
528 if (pdev->id.coreid == SSB_DEV_PCI) {
529 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
530 tmp |= SSB_PCICORE_SBTOPCI_PREF;
531 tmp |= SSB_PCICORE_SBTOPCI_BURST;
532 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
533
534 if (pdev->id.revision < 5) {
535 tmp = ssb_read32(pdev, SSB_IMCFGLO);
536 tmp &= ~SSB_IMCFGLO_SERTO;
537 tmp |= 2;
538 tmp &= ~SSB_IMCFGLO_REQTO;
539 tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
540 ssb_write32(pdev, SSB_IMCFGLO, tmp);
541 ssb_commit_settings(bus);
542 } else if (pdev->id.revision >= 11) {
543 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
544 tmp |= SSB_PCICORE_SBTOPCI_MRM;
545 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
546 }
547 } else {
548 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
549 //TODO: Better make defines for all these magic PCIE values.
550 if ((pdev->id.revision == 0) || (pdev->id.revision == 1)) {
551 /* TLP Workaround register. */
552 tmp = ssb_pcie_read(pc, 0x4);
553 tmp |= 0x8;
554 ssb_pcie_write(pc, 0x4, tmp);
555 }
556 if (pdev->id.revision == 0) {
557 const u8 serdes_rx_device = 0x1F;
558
559 ssb_pcie_mdio_write(pc, serdes_rx_device,
560 2 /* Timer */, 0x8128);
561 ssb_pcie_mdio_write(pc, serdes_rx_device,
562 6 /* CDR */, 0x0100);
563 ssb_pcie_mdio_write(pc, serdes_rx_device,
564 7 /* CDR BW */, 0x1466);
565 } else if (pdev->id.revision == 1) {
566 /* DLLP Link Control register. */
567 tmp = ssb_pcie_read(pc, 0x100);
568 tmp |= 0x40;
569 ssb_pcie_write(pc, 0x100, tmp);
570 }
571 }
572 pc->setup_done = 1;
573 out:
574 return err;
575 }
576 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);
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