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PM / Suspend: Fix ordering of calls in suspend error paths
[linux-kbuild.git] / drivers / ssb / driver_pcicore.c
blob0e8d352246144766112b88db85fb2085f6e1361c
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 #include <linux/ssb/ssb_embedded.h>
15
16 #include "ssb_private.h"
17
18
19 static inline
20 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
21 {
22 return ssb_read32(pc->dev, offset);
23 }
24
25 static inline
26 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
27 {
28 ssb_write32(pc->dev, offset, value);
29 }
30
31 static inline
32 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
33 {
34 return ssb_read16(pc->dev, offset);
35 }
36
37 static inline
38 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
39 {
40 ssb_write16(pc->dev, offset, value);
41 }
42
43 /**************************************************
44 * Code for hostmode operation.
45 **************************************************/
46
47 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
48
49 #include <asm/paccess.h>
50 /* Probe a 32bit value on the bus and catch bus exceptions.
51 * Returns nonzero on a bus exception.
52 * This is MIPS specific */
53 #define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))
54
55 /* Assume one-hot slot wiring */
56 #define SSB_PCI_SLOT_MAX 16
57
58 /* Global lock is OK, as we won't have more than one extpci anyway. */
59 static DEFINE_SPINLOCK(cfgspace_lock);
60 /* Core to access the external PCI config space. Can only have one. */
61 static struct ssb_pcicore *extpci_core;
62
63
64 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
65 unsigned int bus, unsigned int dev,
66 unsigned int func, unsigned int off)
67 {
68 u32 addr = 0;
69 u32 tmp;
70
71 /* We do only have one cardbus device behind the bridge. */
72 if (pc->cardbusmode && (dev >= 1))
73 goto out;
74
75 if (bus == 0) {
76 /* Type 0 transaction */
77 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
78 goto out;
79 /* Slide the window */
80 tmp = SSB_PCICORE_SBTOPCI_CFG0;
81 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
82 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
83 /* Calculate the address */
84 addr = SSB_PCI_CFG;
85 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
86 addr |= (func << 8);
87 addr |= (off & ~3);
88 } else {
89 /* Type 1 transaction */
90 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
91 SSB_PCICORE_SBTOPCI_CFG1);
92 /* Calculate the address */
93 addr = SSB_PCI_CFG;
94 addr |= (bus << 16);
95 addr |= (dev << 11);
96 addr |= (func << 8);
97 addr |= (off & ~3);
98 }
99 out:
100 return addr;
101 }
102
103 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
104 unsigned int bus, unsigned int dev,
105 unsigned int func, unsigned int off,
106 void *buf, int len)
107 {
108 int err = -EINVAL;
109 u32 addr, val;
110 void __iomem *mmio;
111
112 SSB_WARN_ON(!pc->hostmode);
113 if (unlikely(len != 1 && len != 2 && len != 4))
114 goto out;
115 addr = get_cfgspace_addr(pc, bus, dev, func, off);
116 if (unlikely(!addr))
117 goto out;
118 err = -ENOMEM;
119 mmio = ioremap_nocache(addr, len);
120 if (!mmio)
121 goto out;
122
123 if (mips_busprobe32(val, mmio)) {
124 val = 0xffffffff;
125 goto unmap;
126 }
127
128 val = readl(mmio);
129 val >>= (8 * (off & 3));
130
131 switch (len) {
132 case 1:
133 *((u8 *)buf) = (u8)val;
134 break;
135 case 2:
136 *((u16 *)buf) = (u16)val;
137 break;
138 case 4:
139 *((u32 *)buf) = (u32)val;
140 break;
141 }
142 err = 0;
143 unmap:
144 iounmap(mmio);
145 out:
146 return err;
147 }
148
149 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
150 unsigned int bus, unsigned int dev,
151 unsigned int func, unsigned int off,
152 const void *buf, int len)
153 {
154 int err = -EINVAL;
155 u32 addr, val = 0;
156 void __iomem *mmio;
157
158 SSB_WARN_ON(!pc->hostmode);
159 if (unlikely(len != 1 && len != 2 && len != 4))
160 goto out;
161 addr = get_cfgspace_addr(pc, bus, dev, func, off);
162 if (unlikely(!addr))
163 goto out;
164 err = -ENOMEM;
165 mmio = ioremap_nocache(addr, len);
166 if (!mmio)
167 goto out;
168
169 if (mips_busprobe32(val, mmio)) {
170 val = 0xffffffff;
171 goto unmap;
172 }
173
174 switch (len) {
175 case 1:
176 val = readl(mmio);
177 val &= ~(0xFF << (8 * (off & 3)));
178 val |= *((const u8 *)buf) << (8 * (off & 3));
179 break;
180 case 2:
181 val = readl(mmio);
182 val &= ~(0xFFFF << (8 * (off & 3)));
183 val |= *((const u16 *)buf) << (8 * (off & 3));
184 break;
185 case 4:
186 val = *((const u32 *)buf);
187 break;
188 }
189 writel(val, mmio);
190
191 err = 0;
192 unmap:
193 iounmap(mmio);
194 out:
195 return err;
196 }
197
198 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
199 int reg, int size, u32 *val)
200 {
201 unsigned long flags;
202 int err;
203
204 spin_lock_irqsave(&cfgspace_lock, flags);
205 err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
206 PCI_FUNC(devfn), reg, val, size);
207 spin_unlock_irqrestore(&cfgspace_lock, flags);
208
209 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
210 }
211
212 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
213 int reg, int size, u32 val)
214 {
215 unsigned long flags;
216 int err;
217
218 spin_lock_irqsave(&cfgspace_lock, flags);
219 err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
220 PCI_FUNC(devfn), reg, &val, size);
221 spin_unlock_irqrestore(&cfgspace_lock, flags);
222
223 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
224 }
225
226 static struct pci_ops ssb_pcicore_pciops = {
227 .read = ssb_pcicore_read_config,
228 .write = ssb_pcicore_write_config,
229 };
230
231 static struct resource ssb_pcicore_mem_resource = {
232 .name = "SSB PCIcore external memory",
233 .start = SSB_PCI_DMA,
234 .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
235 .flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
236 };
237
238 static struct resource ssb_pcicore_io_resource = {
239 .name = "SSB PCIcore external I/O",
240 .start = 0x100,
241 .end = 0x7FF,
242 .flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
243 };
244
245 static struct pci_controller ssb_pcicore_controller = {
246 .pci_ops = &ssb_pcicore_pciops,
247 .io_resource = &ssb_pcicore_io_resource,
248 .mem_resource = &ssb_pcicore_mem_resource,
249 };
250
251 /* This function is called when doing a pci_enable_device().
252 * We must first check if the device is a device on the PCI-core bridge. */
253 int ssb_pcicore_plat_dev_init(struct pci_dev *d)
254 {
255 if (d->bus->ops != &ssb_pcicore_pciops) {
256 /* This is not a device on the PCI-core bridge. */
257 return -ENODEV;
258 }
259
260 ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
261 pci_name(d));
262
263 /* Fix up interrupt lines */
264 d->irq = ssb_mips_irq(extpci_core->dev) + 2;
265 pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
266
267 return 0;
268 }
269
270 /* Early PCI fixup for a device on the PCI-core bridge. */
271 static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
272 {
273 u8 lat;
274
275 if (dev->bus->ops != &ssb_pcicore_pciops) {
276 /* This is not a device on the PCI-core bridge. */
277 return;
278 }
279 if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
280 return;
281
282 ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));
283
284 /* Enable PCI bridge bus mastering and memory space */
285 pci_set_master(dev);
286 if (pcibios_enable_device(dev, ~0) < 0) {
287 ssb_printk(KERN_ERR "PCI: SSB bridge enable failed\n");
288 return;
289 }
290
291 /* Enable PCI bridge BAR1 prefetch and burst */
292 pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
293
294 /* Make sure our latency is high enough to handle the devices behind us */
295 lat = 168;
296 ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
297 pci_name(dev), lat);
298 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
299 }
300 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);
301
302 /* PCI device IRQ mapping. */
303 int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
304 {
305 if (dev->bus->ops != &ssb_pcicore_pciops) {
306 /* This is not a device on the PCI-core bridge. */
307 return -ENODEV;
308 }
309 return ssb_mips_irq(extpci_core->dev) + 2;
310 }
311
312 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
313 {
314 u32 val;
315
316 if (WARN_ON(extpci_core))
317 return;
318 extpci_core = pc;
319
320 ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
321 /* Reset devices on the external PCI bus */
322 val = SSB_PCICORE_CTL_RST_OE;
323 val |= SSB_PCICORE_CTL_CLK_OE;
324 pcicore_write32(pc, SSB_PCICORE_CTL, val);
325 val |= SSB_PCICORE_CTL_CLK; /* Clock on */
326 pcicore_write32(pc, SSB_PCICORE_CTL, val);
327 udelay(150); /* Assertion time demanded by the PCI standard */
328 val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
329 pcicore_write32(pc, SSB_PCICORE_CTL, val);
330 val = SSB_PCICORE_ARBCTL_INTERN;
331 pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
332 udelay(1); /* Assertion time demanded by the PCI standard */
333
334 if (pc->dev->bus->has_cardbus_slot) {
335 ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n");
336 pc->cardbusmode = 1;
337 /* GPIO 1 resets the bridge */
338 ssb_gpio_out(pc->dev->bus, 1, 1);
339 ssb_gpio_outen(pc->dev->bus, 1, 1);
340 pcicore_write16(pc, SSB_PCICORE_SPROM(0),
341 pcicore_read16(pc, SSB_PCICORE_SPROM(0))
342 | 0x0400);
343 }
344
345 /* 64MB I/O window */
346 pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
347 SSB_PCICORE_SBTOPCI_IO);
348 /* 64MB config space */
349 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
350 SSB_PCICORE_SBTOPCI_CFG0);
351 /* 1GB memory window */
352 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
353 SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
354
355 /* Enable PCI bridge BAR0 prefetch and burst */
356 val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
357 ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
358 /* Clear error conditions */
359 val = 0;
360 ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
361
362 /* Enable PCI interrupts */
363 pcicore_write32(pc, SSB_PCICORE_IMASK,
364 SSB_PCICORE_IMASK_INTA);
365
366 /* Ok, ready to run, register it to the system.
367 * The following needs change, if we want to port hostmode
368 * to non-MIPS platform. */
369 ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
370 set_io_port_base(ssb_pcicore_controller.io_map_base);
371 /* Give some time to the PCI controller to configure itself with the new
372 * values. Not waiting at this point causes crashes of the machine. */
373 mdelay(10);
374 register_pci_controller(&ssb_pcicore_controller);
375 }
376
377 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
378 {
379 struct ssb_bus *bus = pc->dev->bus;
380 u16 chipid_top;
381 u32 tmp;
382
383 chipid_top = (bus->chip_id & 0xFF00);
384 if (chipid_top != 0x4700 &&
385 chipid_top != 0x5300)
386 return 0;
387
388 if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
389 return 0;
390
391 /* The 200-pin BCM4712 package does not bond out PCI. Even when
392 * PCI is bonded out, some boards may leave the pins floating. */
393 if (bus->chip_id == 0x4712) {
394 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
395 return 0;
396 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
397 return 0;
398 }
399 if (bus->chip_id == 0x5350)
400 return 0;
401
402 return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
403 }
404 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
405
406
407 /**************************************************
408 * Generic and Clientmode operation code.
409 **************************************************/
410
411 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
412 {
413 /* Disable PCI interrupts. */
414 ssb_write32(pc->dev, SSB_INTVEC, 0);
415 }
416
417 void ssb_pcicore_init(struct ssb_pcicore *pc)
418 {
419 struct ssb_device *dev = pc->dev;
420 struct ssb_bus *bus;
421
422 if (!dev)
423 return;
424 bus = dev->bus;
425 if (!ssb_device_is_enabled(dev))
426 ssb_device_enable(dev, 0);
427
428 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
429 pc->hostmode = pcicore_is_in_hostmode(pc);
430 if (pc->hostmode)
431 ssb_pcicore_init_hostmode(pc);
432 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
433 if (!pc->hostmode)
434 ssb_pcicore_init_clientmode(pc);
435 }
436
437 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
438 {
439 pcicore_write32(pc, 0x130, address);
440 return pcicore_read32(pc, 0x134);
441 }
442
443 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
444 {
445 pcicore_write32(pc, 0x130, address);
446 pcicore_write32(pc, 0x134, data);
447 }
448
449 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
450 u8 address, u16 data)
451 {
452 const u16 mdio_control = 0x128;
453 const u16 mdio_data = 0x12C;
454 u32 v;
455 int i;
456
457 v = 0x80; /* Enable Preamble Sequence */
458 v |= 0x2; /* MDIO Clock Divisor */
459 pcicore_write32(pc, mdio_control, v);
460
461 v = (1 << 30); /* Start of Transaction */
462 v |= (1 << 28); /* Write Transaction */
463 v |= (1 << 17); /* Turnaround */
464 v |= (u32)device << 22;
465 v |= (u32)address << 18;
466 v |= data;
467 pcicore_write32(pc, mdio_data, v);
468 /* Wait for the device to complete the transaction */
469 udelay(10);
470 for (i = 0; i < 10; i++) {
471 v = pcicore_read32(pc, mdio_control);
472 if (v & 0x100 /* Trans complete */)
473 break;
474 msleep(1);
475 }
476 pcicore_write32(pc, mdio_control, 0);
477 }
478
479 static void ssb_broadcast_value(struct ssb_device *dev,
480 u32 address, u32 data)
481 {
482 /* This is used for both, PCI and ChipCommon core, so be careful. */
483 BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
484 BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
485
486 ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
487 ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
488 ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
489 ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
490 }
491
492 static void ssb_commit_settings(struct ssb_bus *bus)
493 {
494 struct ssb_device *dev;
495
496 dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
497 if (WARN_ON(!dev))
498 return;
499 /* This forces an update of the cached registers. */
500 ssb_broadcast_value(dev, 0xFD8, 0);
501 }
502
503 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
504 struct ssb_device *dev)
505 {
506 struct ssb_device *pdev = pc->dev;
507 struct ssb_bus *bus;
508 int err = 0;
509 u32 tmp;
510
511 if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
512 /* This SSB device is not on a PCI host-bus. So the IRQs are
513 * not routed through the PCI core.
514 * So we must not enable routing through the PCI core. */
515 goto out;
516 }
517
518 if (!pdev)
519 goto out;
520 bus = pdev->bus;
521
522 might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);
523
524 /* Enable interrupts for this device. */
525 if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
526 u32 coremask;
527
528 /* Calculate the "coremask" for the device. */
529 coremask = (1 << dev->core_index);
530
531 SSB_WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
532 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
533 if (err)
534 goto out;
535 tmp |= coremask << 8;
536 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
537 if (err)
538 goto out;
539 } else {
540 u32 intvec;
541
542 intvec = ssb_read32(pdev, SSB_INTVEC);
543 tmp = ssb_read32(dev, SSB_TPSFLAG);
544 tmp &= SSB_TPSFLAG_BPFLAG;
545 intvec |= (1 << tmp);
546 ssb_write32(pdev, SSB_INTVEC, intvec);
547 }
548
549 /* Setup PCIcore operation. */
550 if (pc->setup_done)
551 goto out;
552 if (pdev->id.coreid == SSB_DEV_PCI) {
553 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
554 tmp |= SSB_PCICORE_SBTOPCI_PREF;
555 tmp |= SSB_PCICORE_SBTOPCI_BURST;
556 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
557
558 if (pdev->id.revision < 5) {
559 tmp = ssb_read32(pdev, SSB_IMCFGLO);
560 tmp &= ~SSB_IMCFGLO_SERTO;
561 tmp |= 2;
562 tmp &= ~SSB_IMCFGLO_REQTO;
563 tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
564 ssb_write32(pdev, SSB_IMCFGLO, tmp);
565 ssb_commit_settings(bus);
566 } else if (pdev->id.revision >= 11) {
567 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
568 tmp |= SSB_PCICORE_SBTOPCI_MRM;
569 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
570 }
571 } else {
572 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
573 //TODO: Better make defines for all these magic PCIE values.
574 if ((pdev->id.revision == 0) || (pdev->id.revision == 1)) {
575 /* TLP Workaround register. */
576 tmp = ssb_pcie_read(pc, 0x4);
577 tmp |= 0x8;
578 ssb_pcie_write(pc, 0x4, tmp);
579 }
580 if (pdev->id.revision == 0) {
581 const u8 serdes_rx_device = 0x1F;
582
583 ssb_pcie_mdio_write(pc, serdes_rx_device,
584 2 /* Timer */, 0x8128);
585 ssb_pcie_mdio_write(pc, serdes_rx_device,
586 6 /* CDR */, 0x0100);
587 ssb_pcie_mdio_write(pc, serdes_rx_device,
588 7 /* CDR BW */, 0x1466);
589 } else if (pdev->id.revision == 1) {
590 /* DLLP Link Control register. */
591 tmp = ssb_pcie_read(pc, 0x100);
592 tmp |= 0x40;
593 ssb_pcie_write(pc, 0x100, tmp);
594 }
595 }
596 pc->setup_done = 1;
597 out:
598 return err;
599 }
600 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);
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