2 * Sonics Silicon Backplane
3 * Broadcom PCI-core driver
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
8 * Licensed under the GNU/GPL. See COPYING for details.
11 #include <linux/ssb/ssb.h>
12 #include <linux/pci.h>
13 #include <linux/delay.h>
14 #include <linux/ssb/ssb_embedded.h>
16 #include "ssb_private.h"
20 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
22 return ssb_read32(pc->dev, offset);
26 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
28 ssb_write32(pc->dev, offset, value);
32 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
34 return ssb_read16(pc->dev, offset);
38 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
40 ssb_write16(pc->dev, offset, value);
43 /**************************************************
44 * Code for hostmode operation.
45 **************************************************/
47 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
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)))
55 /* Assume one-hot slot wiring */
56 #define SSB_PCI_SLOT_MAX 16
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;
63 static u32 ssb_pcicore_pcibus_iobase = 0x100;
64 static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA;
66 int pcibios_plat_dev_init(struct pci_dev *d)
72 ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
75 /* Fix up resource bases */
76 for (pos = 0; pos < 6; pos++) {
77 res = &d->resource[pos];
78 if (res->flags & IORESOURCE_IO)
79 base = &ssb_pcicore_pcibus_iobase;
81 base = &ssb_pcicore_pcibus_membase;
83 size = res->end - res->start + 1;
84 if (*base & (size - 1))
85 *base = (*base + size) & ~(size - 1);
87 res->end = res->start + size - 1;
89 pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start);
91 /* Fix up PCI bridge BAR0 only */
92 if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0)
95 /* Fix up interrupt lines */
96 d->irq = ssb_mips_irq(extpci_core->dev) + 2;
97 pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
102 static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
104 if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
107 ssb_printk(KERN_INFO "PCI: fixing up bridge\n");
109 /* Enable PCI bridge bus mastering and memory space */
111 pcibios_enable_device(dev, ~0);
113 /* Enable PCI bridge BAR1 prefetch and burst */
114 pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
116 /* Make sure our latency is high enough to handle the devices behind us */
117 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xa8);
119 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge);
121 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
123 return ssb_mips_irq(extpci_core->dev) + 2;
126 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
127 unsigned int bus, unsigned int dev,
128 unsigned int func, unsigned int off)
133 /* We do only have one cardbus device behind the bridge. */
134 if (pc->cardbusmode && (dev >= 1))
138 /* Type 0 transaction */
139 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
141 /* Slide the window */
142 tmp = SSB_PCICORE_SBTOPCI_CFG0;
143 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
144 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
145 /* Calculate the address */
147 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
151 /* Type 1 transaction */
152 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
153 SSB_PCICORE_SBTOPCI_CFG1);
154 /* Calculate the address */
165 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
166 unsigned int bus, unsigned int dev,
167 unsigned int func, unsigned int off,
174 SSB_WARN_ON(!pc->hostmode);
175 if (unlikely(len != 1 && len != 2 && len != 4))
177 addr = get_cfgspace_addr(pc, bus, dev, func, off);
181 mmio = ioremap_nocache(addr, len);
185 if (mips_busprobe32(val, mmio)) {
191 val >>= (8 * (off & 3));
195 *((u8 *)buf) = (u8)val;
198 *((u16 *)buf) = (u16)val;
201 *((u32 *)buf) = (u32)val;
211 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
212 unsigned int bus, unsigned int dev,
213 unsigned int func, unsigned int off,
214 const void *buf, int len)
220 SSB_WARN_ON(!pc->hostmode);
221 if (unlikely(len != 1 && len != 2 && len != 4))
223 addr = get_cfgspace_addr(pc, bus, dev, func, off);
227 mmio = ioremap_nocache(addr, len);
231 if (mips_busprobe32(val, mmio)) {
239 val &= ~(0xFF << (8 * (off & 3)));
240 val |= *((const u8 *)buf) << (8 * (off & 3));
244 val &= ~(0xFFFF << (8 * (off & 3)));
245 val |= *((const u16 *)buf) << (8 * (off & 3));
248 val = *((const u32 *)buf);
260 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
261 int reg, int size, u32 *val)
266 spin_lock_irqsave(&cfgspace_lock, flags);
267 err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
268 PCI_FUNC(devfn), reg, val, size);
269 spin_unlock_irqrestore(&cfgspace_lock, flags);
271 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
274 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
275 int reg, int size, u32 val)
280 spin_lock_irqsave(&cfgspace_lock, flags);
281 err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
282 PCI_FUNC(devfn), reg, &val, size);
283 spin_unlock_irqrestore(&cfgspace_lock, flags);
285 return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
288 static struct pci_ops ssb_pcicore_pciops = {
289 .read = ssb_pcicore_read_config,
290 .write = ssb_pcicore_write_config,
293 static struct resource ssb_pcicore_mem_resource = {
294 .name = "SSB PCIcore external memory",
295 .start = SSB_PCI_DMA,
296 .end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
297 .flags = IORESOURCE_MEM,
300 static struct resource ssb_pcicore_io_resource = {
301 .name = "SSB PCIcore external I/O",
304 .flags = IORESOURCE_IO,
307 static struct pci_controller ssb_pcicore_controller = {
308 .pci_ops = &ssb_pcicore_pciops,
309 .io_resource = &ssb_pcicore_io_resource,
310 .mem_resource = &ssb_pcicore_mem_resource,
311 .mem_offset = 0x24000000,
314 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
318 if (WARN_ON(extpci_core))
322 ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
323 /* Reset devices on the external PCI bus */
324 val = SSB_PCICORE_CTL_RST_OE;
325 val |= SSB_PCICORE_CTL_CLK_OE;
326 pcicore_write32(pc, SSB_PCICORE_CTL, val);
327 val |= SSB_PCICORE_CTL_CLK; /* Clock on */
328 pcicore_write32(pc, SSB_PCICORE_CTL, val);
329 udelay(150); /* Assertion time demanded by the PCI standard */
330 val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
331 pcicore_write32(pc, SSB_PCICORE_CTL, val);
332 val = SSB_PCICORE_ARBCTL_INTERN;
333 pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
334 udelay(1); /* Assertion time demanded by the PCI standard */
336 if (pc->dev->bus->has_cardbus_slot) {
337 ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n");
339 /* GPIO 1 resets the bridge */
340 ssb_gpio_out(pc->dev->bus, 1, 1);
341 ssb_gpio_outen(pc->dev->bus, 1, 1);
342 pcicore_write16(pc, SSB_PCICORE_SPROM(0),
343 pcicore_read16(pc, SSB_PCICORE_SPROM(0))
347 /* 64MB I/O window */
348 pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
349 SSB_PCICORE_SBTOPCI_IO);
350 /* 64MB config space */
351 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
352 SSB_PCICORE_SBTOPCI_CFG0);
353 /* 1GB memory window */
354 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
355 SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
357 /* Enable PCI bridge BAR0 prefetch and burst */
358 val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
359 ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
360 /* Clear error conditions */
362 ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
364 /* Enable PCI interrupts */
365 pcicore_write32(pc, SSB_PCICORE_IMASK,
366 SSB_PCICORE_IMASK_INTA);
368 /* Ok, ready to run, register it to the system.
369 * The following needs change, if we want to port hostmode
370 * to non-MIPS platform. */
371 set_io_port_base((unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000));
372 /* Give some time to the PCI controller to configure itself with the new
373 * values. Not waiting at this point causes crashes of the machine. */
375 register_pci_controller(&ssb_pcicore_controller);
378 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
380 struct ssb_bus *bus = pc->dev->bus;
384 chipid_top = (bus->chip_id & 0xFF00);
385 if (chipid_top != 0x4700 &&
386 chipid_top != 0x5300)
389 if (bus->sprom.r1.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
392 /* The 200-pin BCM4712 package does not bond out PCI. Even when
393 * PCI is bonded out, some boards may leave the pins floating. */
394 if (bus->chip_id == 0x4712) {
395 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
397 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
400 if (bus->chip_id == 0x5350)
403 return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
405 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
408 /**************************************************
409 * Generic and Clientmode operation code.
410 **************************************************/
412 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
414 /* Disable PCI interrupts. */
415 ssb_write32(pc->dev, SSB_INTVEC, 0);
418 void ssb_pcicore_init(struct ssb_pcicore *pc)
420 struct ssb_device *dev = pc->dev;
426 if (!ssb_device_is_enabled(dev))
427 ssb_device_enable(dev, 0);
429 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
430 pc->hostmode = pcicore_is_in_hostmode(pc);
432 ssb_pcicore_init_hostmode(pc);
433 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
435 ssb_pcicore_init_clientmode(pc);
438 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
440 pcicore_write32(pc, 0x130, address);
441 return pcicore_read32(pc, 0x134);
444 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
446 pcicore_write32(pc, 0x130, address);
447 pcicore_write32(pc, 0x134, data);
450 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
451 u8 address, u16 data)
453 const u16 mdio_control = 0x128;
454 const u16 mdio_data = 0x12C;
458 v = 0x80; /* Enable Preamble Sequence */
459 v |= 0x2; /* MDIO Clock Divisor */
460 pcicore_write32(pc, mdio_control, v);
462 v = (1 << 30); /* Start of Transaction */
463 v |= (1 << 28); /* Write Transaction */
464 v |= (1 << 17); /* Turnaround */
465 v |= (u32)device << 22;
466 v |= (u32)address << 18;
468 pcicore_write32(pc, mdio_data, v);
469 /* Wait for the device to complete the transaction */
471 for (i = 0; i < 10; i++) {
472 v = pcicore_read32(pc, mdio_control);
473 if (v & 0x100 /* Trans complete */)
477 pcicore_write32(pc, mdio_control, 0);
480 static void ssb_broadcast_value(struct ssb_device *dev,
481 u32 address, u32 data)
483 /* This is used for both, PCI and ChipCommon core, so be careful. */
484 BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
485 BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
487 ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
488 ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
489 ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
490 ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
493 static void ssb_commit_settings(struct ssb_bus *bus)
495 struct ssb_device *dev;
497 dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
500 /* This forces an update of the cached registers. */
501 ssb_broadcast_value(dev, 0xFD8, 0);
504 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
505 struct ssb_device *dev)
507 struct ssb_device *pdev = pc->dev;
518 /* Enable interrupts for this device. */
520 ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE))) {
523 /* Calculate the "coremask" for the device. */
524 coremask = (1 << dev->core_index);
526 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
529 tmp |= coremask << 8;
530 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
536 intvec = ssb_read32(pdev, SSB_INTVEC);
537 if ((bus->chip_id & 0xFF00) == 0x4400) {
538 /* Workaround: On the BCM44XX the BPFLAG routing
539 * bit is wrong. Use a hardcoded constant. */
540 intvec |= 0x00000002;
542 tmp = ssb_read32(dev, SSB_TPSFLAG);
543 tmp &= SSB_TPSFLAG_BPFLAG;
546 ssb_write32(pdev, SSB_INTVEC, intvec);
549 /* Setup PCIcore operation. */
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);
558 if (pdev->id.revision < 5) {
559 tmp = ssb_read32(pdev, SSB_IMCFGLO);
560 tmp &= ~SSB_IMCFGLO_SERTO;
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);
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);
578 ssb_pcie_write(pc, 0x4, tmp);
580 if (pdev->id.revision == 0) {
581 const u8 serdes_rx_device = 0x1F;
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);
593 ssb_pcie_write(pc, 0x100, tmp);
600 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);