2 * Sonics Silicon Backplane
3 * Broadcom PCI-core driver
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
8 * Licensed under the GNU/GPL. See COPYING for details.
11 #include <linux/ssb/ssb.h>
12 #include <linux/pci.h>
13 #include <linux/export.h>
14 #include <linux/delay.h>
15 #include <linux/ssb/ssb_embedded.h>
17 #include "ssb_private.h"
19 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address);
20 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data);
21 static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address);
22 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
23 u8 address, u16 data);
26 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
28 return ssb_read32(pc->dev, offset);
32 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
34 ssb_write32(pc->dev, offset, value);
38 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
40 return ssb_read16(pc->dev, offset);
44 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
46 ssb_write16(pc->dev, offset, value);
49 /**************************************************
50 * Code for hostmode operation.
51 **************************************************/
53 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
55 #include <asm/paccess.h>
56 /* Probe a 32bit value on the bus and catch bus exceptions.
57 * Returns nonzero on a bus exception.
58 * This is MIPS specific */
59 #define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))
61 /* Assume one-hot slot wiring */
62 #define SSB_PCI_SLOT_MAX 16
64 /* Global lock is OK, as we won't have more than one extpci anyway. */
65 static DEFINE_SPINLOCK(cfgspace_lock);
66 /* Core to access the external PCI config space. Can only have one. */
67 static struct ssb_pcicore *extpci_core;
70 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
71 unsigned int bus, unsigned int dev,
72 unsigned int func, unsigned int off)
77 /* We do only have one cardbus device behind the bridge. */
78 if (pc->cardbusmode && (dev > 1))
82 /* Type 0 transaction */
83 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
85 /* Slide the window */
86 tmp = SSB_PCICORE_SBTOPCI_CFG0;
87 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
88 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
89 /* Calculate the address */
91 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
95 /* Type 1 transaction */
96 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
97 SSB_PCICORE_SBTOPCI_CFG1);
98 /* Calculate the address */
109 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
110 unsigned int bus, unsigned int dev,
111 unsigned int func, unsigned int off,
118 SSB_WARN_ON(!pc->hostmode);
119 if (unlikely(len != 1 && len != 2 && len != 4))
121 addr = get_cfgspace_addr(pc, bus, dev, func, off);
125 mmio = ioremap_nocache(addr, len);
129 if (mips_busprobe32(val, mmio)) {
135 val >>= (8 * (off & 3));
139 *((u8 *)buf) = (u8)val;
142 *((u16 *)buf) = (u16)val;
145 *((u32 *)buf) = (u32)val;
155 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
156 unsigned int bus, unsigned int dev,
157 unsigned int func, unsigned int off,
158 const void *buf, int len)
164 SSB_WARN_ON(!pc->hostmode);
165 if (unlikely(len != 1 && len != 2 && len != 4))
167 addr = get_cfgspace_addr(pc, bus, dev, func, off);
171 mmio = ioremap_nocache(addr, len);
175 if (mips_busprobe32(val, mmio)) {
183 val &= ~(0xFF << (8 * (off & 3)));
184 val |= *((const u8 *)buf) << (8 * (off & 3));
188 val &= ~(0xFFFF << (8 * (off & 3)));
189 val |= *((const u16 *)buf) << (8 * (off & 3));
192 val = *((const u32 *)buf);
204 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
205 int reg, int size, u32 *val)
210 spin_lock_irqsave(&cfgspace_lock, flags);
211 err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
212 PCI_FUNC(devfn), reg, val, size);
213 spin_unlock_irqrestore(&cfgspace_lock, flags);
215 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
218 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
219 int reg, int size, u32 val)
224 spin_lock_irqsave(&cfgspace_lock, flags);
225 err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
226 PCI_FUNC(devfn), reg, &val, size);
227 spin_unlock_irqrestore(&cfgspace_lock, flags);
229 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
232 static struct pci_ops ssb_pcicore_pciops = {
233 .read = ssb_pcicore_read_config,
234 .write = ssb_pcicore_write_config,
237 static struct resource ssb_pcicore_mem_resource = {
238 .name = "SSB PCIcore external memory",
239 .start = SSB_PCI_DMA,
240 .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
241 .flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
244 static struct resource ssb_pcicore_io_resource = {
245 .name = "SSB PCIcore external I/O",
248 .flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
251 static struct pci_controller ssb_pcicore_controller = {
252 .pci_ops = &ssb_pcicore_pciops,
253 .io_resource = &ssb_pcicore_io_resource,
254 .mem_resource = &ssb_pcicore_mem_resource,
257 /* This function is called when doing a pci_enable_device().
258 * We must first check if the device is a device on the PCI-core bridge. */
259 int ssb_pcicore_plat_dev_init(struct pci_dev *d)
261 if (d->bus->ops != &ssb_pcicore_pciops) {
262 /* This is not a device on the PCI-core bridge. */
266 ssb_info("PCI: Fixing up device %s\n", pci_name(d));
268 /* Fix up interrupt lines */
269 d->irq = ssb_mips_irq(extpci_core->dev) + 2;
270 pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
275 /* Early PCI fixup for a device on the PCI-core bridge. */
276 static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
280 if (dev->bus->ops != &ssb_pcicore_pciops) {
281 /* This is not a device on the PCI-core bridge. */
284 if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
287 ssb_info("PCI: Fixing up bridge %s\n", pci_name(dev));
289 /* Enable PCI bridge bus mastering and memory space */
291 if (pcibios_enable_device(dev, ~0) < 0) {
292 ssb_err("PCI: SSB bridge enable failed\n");
296 /* Enable PCI bridge BAR1 prefetch and burst */
297 pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
299 /* Make sure our latency is high enough to handle the devices behind us */
301 ssb_info("PCI: Fixing latency timer of device %s to %u\n",
303 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
305 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);
307 /* PCI device IRQ mapping. */
308 int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
310 if (dev->bus->ops != &ssb_pcicore_pciops) {
311 /* This is not a device on the PCI-core bridge. */
314 return ssb_mips_irq(extpci_core->dev) + 2;
317 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
321 if (WARN_ON(extpci_core))
325 ssb_dbg("PCIcore in host mode found\n");
326 /* Reset devices on the external PCI bus */
327 val = SSB_PCICORE_CTL_RST_OE;
328 val |= SSB_PCICORE_CTL_CLK_OE;
329 pcicore_write32(pc, SSB_PCICORE_CTL, val);
330 val |= SSB_PCICORE_CTL_CLK; /* Clock on */
331 pcicore_write32(pc, SSB_PCICORE_CTL, val);
332 udelay(150); /* Assertion time demanded by the PCI standard */
333 val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
334 pcicore_write32(pc, SSB_PCICORE_CTL, val);
335 val = SSB_PCICORE_ARBCTL_INTERN;
336 pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
337 udelay(1); /* Assertion time demanded by the PCI standard */
339 if (pc->dev->bus->has_cardbus_slot) {
340 ssb_dbg("CardBus slot detected\n");
342 /* GPIO 1 resets the bridge */
343 ssb_gpio_out(pc->dev->bus, 1, 1);
344 ssb_gpio_outen(pc->dev->bus, 1, 1);
345 pcicore_write16(pc, SSB_PCICORE_SPROM(0),
346 pcicore_read16(pc, SSB_PCICORE_SPROM(0))
350 /* 64MB I/O window */
351 pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
352 SSB_PCICORE_SBTOPCI_IO);
353 /* 64MB config space */
354 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
355 SSB_PCICORE_SBTOPCI_CFG0);
356 /* 1GB memory window */
357 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
358 SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
361 * Accessing PCI config without a proper delay after devices reset (not
362 * GPIO reset) was causing reboots on WRT300N v1.0 (BCM4704).
363 * Tested delay 850 us lowered reboot chance to 50-80%, 1000 us fixed it
364 * completely. Flushing all writes was also tested but with no luck.
365 * The same problem was reported for WRT350N v1 (BCM4705), so we just
366 * sleep here unconditionally.
368 usleep_range(1000, 2000);
370 /* Enable PCI bridge BAR0 prefetch and burst */
371 val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
372 ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
373 /* Clear error conditions */
375 ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
377 /* Enable PCI interrupts */
378 pcicore_write32(pc, SSB_PCICORE_IMASK,
379 SSB_PCICORE_IMASK_INTA);
381 /* Ok, ready to run, register it to the system.
382 * The following needs change, if we want to port hostmode
383 * to non-MIPS platform. */
384 ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
385 set_io_port_base(ssb_pcicore_controller.io_map_base);
386 /* Give some time to the PCI controller to configure itself with the new
387 * values. Not waiting at this point causes crashes of the machine. */
389 register_pci_controller(&ssb_pcicore_controller);
392 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
394 struct ssb_bus *bus = pc->dev->bus;
398 chipid_top = (bus->chip_id & 0xFF00);
399 if (chipid_top != 0x4700 &&
400 chipid_top != 0x5300)
403 if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
406 /* The 200-pin BCM4712 package does not bond out PCI. Even when
407 * PCI is bonded out, some boards may leave the pins floating. */
408 if (bus->chip_id == 0x4712) {
409 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
411 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
414 if (bus->chip_id == 0x5350)
417 return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
419 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
421 /**************************************************
423 **************************************************/
425 static void ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore *pc)
427 u16 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(0));
428 if (((tmp & 0xF000) >> 12) != pc->dev->core_index) {
430 tmp |= (pc->dev->core_index << 12);
431 pcicore_write16(pc, SSB_PCICORE_SPROM(0), tmp);
435 static u8 ssb_pcicore_polarity_workaround(struct ssb_pcicore *pc)
437 return (ssb_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80;
440 static void ssb_pcicore_serdes_workaround(struct ssb_pcicore *pc)
442 const u8 serdes_pll_device = 0x1D;
443 const u8 serdes_rx_device = 0x1F;
446 ssb_pcie_mdio_write(pc, serdes_rx_device, 1 /* Control */,
447 ssb_pcicore_polarity_workaround(pc));
448 tmp = ssb_pcie_mdio_read(pc, serdes_pll_device, 1 /* Control */);
450 ssb_pcie_mdio_write(pc, serdes_pll_device, 1, tmp & ~0x4000);
453 static void ssb_pcicore_pci_setup_workarounds(struct ssb_pcicore *pc)
455 struct ssb_device *pdev = pc->dev;
456 struct ssb_bus *bus = pdev->bus;
459 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
460 tmp |= SSB_PCICORE_SBTOPCI_PREF;
461 tmp |= SSB_PCICORE_SBTOPCI_BURST;
462 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
464 if (pdev->id.revision < 5) {
465 tmp = ssb_read32(pdev, SSB_IMCFGLO);
466 tmp &= ~SSB_IMCFGLO_SERTO;
468 tmp &= ~SSB_IMCFGLO_REQTO;
469 tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
470 ssb_write32(pdev, SSB_IMCFGLO, tmp);
471 ssb_commit_settings(bus);
472 } else if (pdev->id.revision >= 11) {
473 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
474 tmp |= SSB_PCICORE_SBTOPCI_MRM;
475 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
479 static void ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore *pc)
482 u8 rev = pc->dev->id.revision;
484 if (rev == 0 || rev == 1) {
485 /* TLP Workaround register. */
486 tmp = ssb_pcie_read(pc, 0x4);
488 ssb_pcie_write(pc, 0x4, tmp);
491 /* DLLP Link Control register. */
492 tmp = ssb_pcie_read(pc, 0x100);
494 ssb_pcie_write(pc, 0x100, tmp);
498 const u8 serdes_rx_device = 0x1F;
500 ssb_pcie_mdio_write(pc, serdes_rx_device,
501 2 /* Timer */, 0x8128);
502 ssb_pcie_mdio_write(pc, serdes_rx_device,
503 6 /* CDR */, 0x0100);
504 ssb_pcie_mdio_write(pc, serdes_rx_device,
505 7 /* CDR BW */, 0x1466);
506 } else if (rev == 3 || rev == 4 || rev == 5) {
507 /* TODO: DLLP Power Management Threshold */
508 ssb_pcicore_serdes_workaround(pc);
510 } else if (rev == 7) {
511 /* TODO: No PLL down */
515 /* Miscellaneous Configuration Fixup */
516 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(5));
518 pcicore_write16(pc, SSB_PCICORE_SPROM(5),
523 /**************************************************
524 * Generic and Clientmode operation code.
525 **************************************************/
527 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
529 struct ssb_device *pdev = pc->dev;
530 struct ssb_bus *bus = pdev->bus;
532 if (bus->bustype == SSB_BUSTYPE_PCI)
533 ssb_pcicore_fix_sprom_core_index(pc);
535 /* Disable PCI interrupts. */
536 ssb_write32(pdev, SSB_INTVEC, 0);
538 /* Additional PCIe always once-executed workarounds */
539 if (pc->dev->id.coreid == SSB_DEV_PCIE) {
540 ssb_pcicore_serdes_workaround(pc);
542 /* TODO: Clock Request Update */
546 void ssb_pcicore_init(struct ssb_pcicore *pc)
548 struct ssb_device *dev = pc->dev;
552 if (!ssb_device_is_enabled(dev))
553 ssb_device_enable(dev, 0);
555 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
556 pc->hostmode = pcicore_is_in_hostmode(pc);
558 ssb_pcicore_init_hostmode(pc);
559 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
561 ssb_pcicore_init_clientmode(pc);
564 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
566 pcicore_write32(pc, 0x130, address);
567 return pcicore_read32(pc, 0x134);
570 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
572 pcicore_write32(pc, 0x130, address);
573 pcicore_write32(pc, 0x134, data);
576 static void ssb_pcie_mdio_set_phy(struct ssb_pcicore *pc, u8 phy)
578 const u16 mdio_control = 0x128;
579 const u16 mdio_data = 0x12C;
583 v = (1 << 30); /* Start of Transaction */
584 v |= (1 << 28); /* Write Transaction */
585 v |= (1 << 17); /* Turnaround */
588 pcicore_write32(pc, mdio_data, v);
591 for (i = 0; i < 200; i++) {
592 v = pcicore_read32(pc, mdio_control);
593 if (v & 0x100 /* Trans complete */)
599 static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address)
601 const u16 mdio_control = 0x128;
602 const u16 mdio_data = 0x12C;
603 int max_retries = 10;
608 v = 0x80; /* Enable Preamble Sequence */
609 v |= 0x2; /* MDIO Clock Divisor */
610 pcicore_write32(pc, mdio_control, v);
612 if (pc->dev->id.revision >= 10) {
614 ssb_pcie_mdio_set_phy(pc, device);
617 v = (1 << 30); /* Start of Transaction */
618 v |= (1 << 29); /* Read Transaction */
619 v |= (1 << 17); /* Turnaround */
620 if (pc->dev->id.revision < 10)
621 v |= (u32)device << 22;
622 v |= (u32)address << 18;
623 pcicore_write32(pc, mdio_data, v);
624 /* Wait for the device to complete the transaction */
626 for (i = 0; i < max_retries; i++) {
627 v = pcicore_read32(pc, mdio_control);
628 if (v & 0x100 /* Trans complete */) {
630 ret = pcicore_read32(pc, mdio_data);
635 pcicore_write32(pc, mdio_control, 0);
639 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
640 u8 address, u16 data)
642 const u16 mdio_control = 0x128;
643 const u16 mdio_data = 0x12C;
644 int max_retries = 10;
648 v = 0x80; /* Enable Preamble Sequence */
649 v |= 0x2; /* MDIO Clock Divisor */
650 pcicore_write32(pc, mdio_control, v);
652 if (pc->dev->id.revision >= 10) {
654 ssb_pcie_mdio_set_phy(pc, device);
657 v = (1 << 30); /* Start of Transaction */
658 v |= (1 << 28); /* Write Transaction */
659 v |= (1 << 17); /* Turnaround */
660 if (pc->dev->id.revision < 10)
661 v |= (u32)device << 22;
662 v |= (u32)address << 18;
664 pcicore_write32(pc, mdio_data, v);
665 /* Wait for the device to complete the transaction */
667 for (i = 0; i < max_retries; i++) {
668 v = pcicore_read32(pc, mdio_control);
669 if (v & 0x100 /* Trans complete */)
673 pcicore_write32(pc, mdio_control, 0);
676 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
677 struct ssb_device *dev)
679 struct ssb_device *pdev = pc->dev;
684 if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
685 /* This SSB device is not on a PCI host-bus. So the IRQs are
686 * not routed through the PCI core.
687 * So we must not enable routing through the PCI core. */
695 might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);
697 /* Enable interrupts for this device. */
698 if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
701 /* Calculate the "coremask" for the device. */
702 coremask = (1 << dev->core_index);
704 SSB_WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
705 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
708 tmp |= coremask << 8;
709 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
715 intvec = ssb_read32(pdev, SSB_INTVEC);
716 tmp = ssb_read32(dev, SSB_TPSFLAG);
717 tmp &= SSB_TPSFLAG_BPFLAG;
718 intvec |= (1 << tmp);
719 ssb_write32(pdev, SSB_INTVEC, intvec);
722 /* Setup PCIcore operation. */
725 if (pdev->id.coreid == SSB_DEV_PCI) {
726 ssb_pcicore_pci_setup_workarounds(pc);
728 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
729 ssb_pcicore_pcie_setup_workarounds(pc);
735 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);