drivers/ssb/driver_pcicore.c - kernel/common - Git at Google

 /*
  * Sonics Silicon Backplane
  * Broadcom PCI-core driver
  *
  * Copyright 2005, Broadcom Corporation
  * Copyright 2006, 2007, Michael Buesch <[email protected]>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */

 #include <linux/ssb/ssb.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/ssb/ssb_embedded.h>

 #include "ssb_private.h"


 static inline
 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
 {
 	return ssb_read32(pc->dev, offset);
 }

 static inline
 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
 {
 	ssb_write32(pc->dev, offset, value);
 }

 static inline
 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
 {
 	return ssb_read16(pc->dev, offset);
 }

 static inline
 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
 {
 	ssb_write16(pc->dev, offset, value);
 }

 /**************************************************
  * Code for hostmode operation.
  **************************************************/

 #ifdef CONFIG_SSB_PCICORE_HOSTMODE

 #include <asm/paccess.h>
 /* Probe a 32bit value on the bus and catch bus exceptions.
  * Returns nonzero on a bus exception.
  * This is MIPS specific */
 #define mips_busprobe32(val, addr)	get_dbe((val), ((u32 *)(addr)))

 /* Assume one-hot slot wiring */
 #define SSB_PCI_SLOT_MAX	16

 /* Global lock is OK, as we won't have more than one extpci anyway. */
 static DEFINE_SPINLOCK(cfgspace_lock);
 /* Core to access the external PCI config space. Can only have one. */
 static struct ssb_pcicore *extpci_core;


 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
 			     unsigned int bus, unsigned int dev,
 			     unsigned int func, unsigned int off)
 {
 	u32 addr = 0;
 	u32 tmp;

 	/* We do only have one cardbus device behind the bridge. */
 	if (pc->cardbusmode && (dev >= 1))
 		goto out;

 	if (bus == 0) {
 		/* Type 0 transaction */
 		if (unlikely(dev >= SSB_PCI_SLOT_MAX))
 			goto out;
 		/* Slide the window */
 		tmp = SSB_PCICORE_SBTOPCI_CFG0;
 		tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
 		pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
 		/* Calculate the address */
 		addr = SSB_PCI_CFG;
 		addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
 		addr |= (func << 8);
 		addr |= (off & ~3);
 	} else {
 		/* Type 1 transaction */
 		pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
 				SSB_PCICORE_SBTOPCI_CFG1);
 		/* Calculate the address */
 		addr = SSB_PCI_CFG;
 		addr |= (bus << 16);
 		addr |= (dev << 11);
 		addr |= (func << 8);
 		addr |= (off & ~3);
 	}
 out:
 	return addr;
 }

 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
 				  unsigned int bus, unsigned int dev,
 				  unsigned int func, unsigned int off,
 				  void *buf, int len)
 {
 	int err = -EINVAL;
 	u32 addr, val;
 	void __iomem *mmio;

 	SSB_WARN_ON(!pc->hostmode);
 	if (unlikely(len != 1 && len != 2 && len != 4))
 		goto out;
 	addr = get_cfgspace_addr(pc, bus, dev, func, off);
 	if (unlikely(!addr))
 		goto out;
 	err = -ENOMEM;
 	mmio = ioremap_nocache(addr, len);
 	if (!mmio)
 		goto out;

 	if (mips_busprobe32(val, mmio)) {
 		val = 0xffffffff;
 		goto unmap;
 	}

 	val = readl(mmio);
 	val >>= (8 * (off & 3));

 	switch (len) {
 	case 1:
 		*((u8 *)buf) = (u8)val;
 		break;
 	case 2:
 		*((u16 *)buf) = (u16)val;
 		break;
 	case 4:
 		*((u32 *)buf) = (u32)val;
 		break;
 	}
 	err = 0;
 unmap:
 	iounmap(mmio);
 out:
 	return err;
 }

 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
 				   unsigned int bus, unsigned int dev,
 				   unsigned int func, unsigned int off,
 				   const void *buf, int len)
 {
 	int err = -EINVAL;
 	u32 addr, val = 0;
 	void __iomem *mmio;

 	SSB_WARN_ON(!pc->hostmode);
 	if (unlikely(len != 1 && len != 2 && len != 4))
 		goto out;
 	addr = get_cfgspace_addr(pc, bus, dev, func, off);
 	if (unlikely(!addr))
 		goto out;
 	err = -ENOMEM;
 	mmio = ioremap_nocache(addr, len);
 	if (!mmio)
 		goto out;

 	if (mips_busprobe32(val, mmio)) {
 		val = 0xffffffff;
 		goto unmap;
 	}

 	switch (len) {
 	case 1:
 		val = readl(mmio);
 		val &= ~(0xFF << (8 * (off & 3)));
 		val |= *((const u8 *)buf) << (8 * (off & 3));
 		break;
 	case 2:
 		val = readl(mmio);
 		val &= ~(0xFFFF << (8 * (off & 3)));
 		val |= *((const u16 *)buf) << (8 * (off & 3));
 		break;
 	case 4:
 		val = *((const u32 *)buf);
 		break;
 	}
 	writel(val, mmio);

 	err = 0;
 unmap:
 	iounmap(mmio);
 out:
 	return err;
 }

 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
 				   int reg, int size, u32 *val)
 {
 	unsigned long flags;
 	int err;

 	spin_lock_irqsave(&cfgspace_lock, flags);
 	err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
 				     PCI_FUNC(devfn), reg, val, size);
 	spin_unlock_irqrestore(&cfgspace_lock, flags);

 	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 }

 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
 				    int reg, int size, u32 val)
 {
 	unsigned long flags;
 	int err;

 	spin_lock_irqsave(&cfgspace_lock, flags);
 	err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
 				      PCI_FUNC(devfn), reg, &val, size);
 	spin_unlock_irqrestore(&cfgspace_lock, flags);

 	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops ssb_pcicore_pciops = {
 	.read	= ssb_pcicore_read_config,
 	.write	= ssb_pcicore_write_config,
 };

 static struct resource ssb_pcicore_mem_resource = {
 	.name	= "SSB PCIcore external memory",
 	.start	= SSB_PCI_DMA,
 	.end	= SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
 	.flags	= IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
 };

 static struct resource ssb_pcicore_io_resource = {
 	.name	= "SSB PCIcore external I/O",
 	.start	= 0x100,
 	.end	= 0x7FF,
 	.flags	= IORESOURCE_IO | IORESOURCE_PCI_FIXED,
 };

 static struct pci_controller ssb_pcicore_controller = {
 	.pci_ops	= &ssb_pcicore_pciops,
 	.io_resource	= &ssb_pcicore_io_resource,
 	.mem_resource	= &ssb_pcicore_mem_resource,
 	.mem_offset	= 0x24000000,
 };

 static u32 ssb_pcicore_pcibus_iobase = 0x100;
 static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA;

 /* This function is called when doing a pci_enable_device().
  * We must first check if the device is a device on the PCI-core bridge. */
 int ssb_pcicore_plat_dev_init(struct pci_dev *d)
 {
 	struct resource *res;
 	int pos, size;
 	u32 *base;

 	if (d->bus->ops != &ssb_pcicore_pciops) {
 		/* This is not a device on the PCI-core bridge. */
 		return -ENODEV;
 	}

 	ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
 		   pci_name(d));

 	/* Fix up resource bases */
 	for (pos = 0; pos < 6; pos++) {
 		res = &d->resource[pos];
 		if (res->flags & IORESOURCE_IO)
 			base = &ssb_pcicore_pcibus_iobase;
 		else
 			base = &ssb_pcicore_pcibus_membase;
 		res->flags |= IORESOURCE_PCI_FIXED;
 		if (res->end) {
 			size = res->end - res->start + 1;
 			if (*base & (size - 1))
 				*base = (*base + size) & ~(size - 1);
 			res->start = *base;
 			res->end = res->start + size - 1;
 			*base += size;
 			pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start);
 		}
 		/* Fix up PCI bridge BAR0 only */
 		if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0)
 			break;
 	}
 	/* Fix up interrupt lines */
 	d->irq = ssb_mips_irq(extpci_core->dev) + 2;
 	pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);

 	return 0;
 }

 /* Early PCI fixup for a device on the PCI-core bridge. */
 static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
 {
 	u8 lat;

 	if (dev->bus->ops != &ssb_pcicore_pciops) {
 		/* This is not a device on the PCI-core bridge. */
 		return;
 	}
 	if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
 		return;

 	ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));

 	/* Enable PCI bridge bus mastering and memory space */
 	pci_set_master(dev);
 	if (pcibios_enable_device(dev, ~0) < 0) {
 		ssb_printk(KERN_ERR "PCI: SSB bridge enable failed\n");
 		return;
 	}

 	/* Enable PCI bridge BAR1 prefetch and burst */
 	pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);

 	/* Make sure our latency is high enough to handle the devices behind us */
 	lat = 168;
 	ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
 		   pci_name(dev), lat);
 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);

 /* PCI device IRQ mapping. */
 int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	if (dev->bus->ops != &ssb_pcicore_pciops) {
 		/* This is not a device on the PCI-core bridge. */
 		return -ENODEV;
 	}
 	return ssb_mips_irq(extpci_core->dev) + 2;
 }

 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
 {
 	u32 val;

 	if (WARN_ON(extpci_core))
 		return;
 	extpci_core = pc;

 	ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
 	/* Reset devices on the external PCI bus */
 	val = SSB_PCICORE_CTL_RST_OE;
 	val |= SSB_PCICORE_CTL_CLK_OE;
 	pcicore_write32(pc, SSB_PCICORE_CTL, val);
 	val |= SSB_PCICORE_CTL_CLK; /* Clock on */
 	pcicore_write32(pc, SSB_PCICORE_CTL, val);
 	udelay(150); /* Assertion time demanded by the PCI standard */
 	val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
 	pcicore_write32(pc, SSB_PCICORE_CTL, val);
 	val = SSB_PCICORE_ARBCTL_INTERN;
 	pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
 	udelay(1); /* Assertion time demanded by the PCI standard */

 	if (pc->dev->bus->has_cardbus_slot) {
 		ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n");
 		pc->cardbusmode = 1;
 		/* GPIO 1 resets the bridge */
 		ssb_gpio_out(pc->dev->bus, 1, 1);
 		ssb_gpio_outen(pc->dev->bus, 1, 1);
 		pcicore_write16(pc, SSB_PCICORE_SPROM(0),
 				pcicore_read16(pc, SSB_PCICORE_SPROM(0))
 				| 0x0400);
 	}

 	/* 64MB I/O window */
 	pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
 			SSB_PCICORE_SBTOPCI_IO);
 	/* 64MB config space */
 	pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
 			SSB_PCICORE_SBTOPCI_CFG0);
 	/* 1GB memory window */
 	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
 			SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);

 	/* Enable PCI bridge BAR0 prefetch and burst */
 	val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
 	ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
 	/* Clear error conditions */
 	val = 0;
 	ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);

 	/* Enable PCI interrupts */
 	pcicore_write32(pc, SSB_PCICORE_IMASK,
 			SSB_PCICORE_IMASK_INTA);

 	/* Ok, ready to run, register it to the system.
 	 * The following needs change, if we want to port hostmode
 	 * to non-MIPS platform. */
 	ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
 	set_io_port_base(ssb_pcicore_controller.io_map_base);
 	/* Give some time to the PCI controller to configure itself with the new
 	 * values. Not waiting at this point causes crashes of the machine. */
 	mdelay(10);
 	register_pci_controller(&ssb_pcicore_controller);
 }

 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
 {
 	struct ssb_bus *bus = pc->dev->bus;
 	u16 chipid_top;
 	u32 tmp;

 	chipid_top = (bus->chip_id & 0xFF00);
 	if (chipid_top != 0x4700 &&
 	    chipid_top != 0x5300)
 		return 0;

 	if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
 		return 0;

 	/* The 200-pin BCM4712 package does not bond out PCI. Even when
 	 * PCI is bonded out, some boards may leave the pins floating. */
 	if (bus->chip_id == 0x4712) {
 		if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
 			return 0;
 		if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
 			return 0;
 	}
 	if (bus->chip_id == 0x5350)
 		return 0;

 	return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
 }
 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */


 /**************************************************
  * Generic and Clientmode operation code.
  **************************************************/

 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
 {
 	/* Disable PCI interrupts. */
 	ssb_write32(pc->dev, SSB_INTVEC, 0);
 }

 void ssb_pcicore_init(struct ssb_pcicore *pc)
 {
 	struct ssb_device *dev = pc->dev;
 	struct ssb_bus *bus;

 	if (!dev)
 		return;
 	bus = dev->bus;
 	if (!ssb_device_is_enabled(dev))
 		ssb_device_enable(dev, 0);

 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
 	pc->hostmode = pcicore_is_in_hostmode(pc);
 	if (pc->hostmode)
 		ssb_pcicore_init_hostmode(pc);
 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
 	if (!pc->hostmode)
 		ssb_pcicore_init_clientmode(pc);
 }

 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
 {
 	pcicore_write32(pc, 0x130, address);
 	return pcicore_read32(pc, 0x134);
 }

 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
 {
 	pcicore_write32(pc, 0x130, address);
 	pcicore_write32(pc, 0x134, data);
 }

 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
 				u8 address, u16 data)
 {
 	const u16 mdio_control = 0x128;
 	const u16 mdio_data = 0x12C;
 	u32 v;
 	int i;

 	v = 0x80; /* Enable Preamble Sequence */
 	v |= 0x2; /* MDIO Clock Divisor */
 	pcicore_write32(pc, mdio_control, v);

 	v = (1 << 30); /* Start of Transaction */
 	v |= (1 << 28); /* Write Transaction */
 	v |= (1 << 17); /* Turnaround */
 	v |= (u32)device << 22;
 	v |= (u32)address << 18;
 	v |= data;
 	pcicore_write32(pc, mdio_data, v);
 	/* Wait for the device to complete the transaction */
 	udelay(10);
 	for (i = 0; i < 10; i++) {
 		v = pcicore_read32(pc, mdio_control);
 		if (v & 0x100 /* Trans complete */)
 			break;
 		msleep(1);
 	}
 	pcicore_write32(pc, mdio_control, 0);
 }

 static void ssb_broadcast_value(struct ssb_device *dev,
 				u32 address, u32 data)
 {
 	/* This is used for both, PCI and ChipCommon core, so be careful. */
 	BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
 	BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);

 	ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
 	ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
 	ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
 	ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
 }

 static void ssb_commit_settings(struct ssb_bus *bus)
 {
 	struct ssb_device *dev;

 	dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
 	if (WARN_ON(!dev))
 		return;
 	/* This forces an update of the cached registers. */
 	ssb_broadcast_value(dev, 0xFD8, 0);
 }

 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
 				   struct ssb_device *dev)
 {
 	struct ssb_device *pdev = pc->dev;
 	struct ssb_bus *bus;
 	int err = 0;
 	u32 tmp;

 	if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
 		/* This SSB device is not on a PCI host-bus. So the IRQs are
 		 * not routed through the PCI core.
 		 * So we must not enable routing through the PCI core. */
 		goto out;
 	}

 	if (!pdev)
 		goto out;
 	bus = pdev->bus;

 	might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);

 	/* Enable interrupts for this device. */
 	if (bus->host_pci &&
 	    ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE))) {
 		u32 coremask;

 		/* Calculate the "coremask" for the device. */
 		coremask = (1 << dev->core_index);

 		err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
 		if (err)
 			goto out;
 		tmp |= coremask << 8;
 		err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
 		if (err)
 			goto out;
 	} else {
 		u32 intvec;

 		intvec = ssb_read32(pdev, SSB_INTVEC);
 		tmp = ssb_read32(dev, SSB_TPSFLAG);
 		tmp &= SSB_TPSFLAG_BPFLAG;
 		intvec |= (1 << tmp);
 		ssb_write32(pdev, SSB_INTVEC, intvec);
 	}

 	/* Setup PCIcore operation. */
 	if (pc->setup_done)
 		goto out;
 	if (pdev->id.coreid == SSB_DEV_PCI) {
 		tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 		tmp |= SSB_PCICORE_SBTOPCI_PREF;
 		tmp |= SSB_PCICORE_SBTOPCI_BURST;
 		pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);

 		if (pdev->id.revision < 5) {
 			tmp = ssb_read32(pdev, SSB_IMCFGLO);
 			tmp &= ~SSB_IMCFGLO_SERTO;
 			tmp |= 2;
 			tmp &= ~SSB_IMCFGLO_REQTO;
 			tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
 			ssb_write32(pdev, SSB_IMCFGLO, tmp);
 			ssb_commit_settings(bus);
 		} else if (pdev->id.revision >= 11) {
 			tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 			tmp |= SSB_PCICORE_SBTOPCI_MRM;
 			pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
 		}
 	} else {
 		WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
 		//TODO: Better make defines for all these magic PCIE values.
 		if ((pdev->id.revision == 0) || (pdev->id.revision == 1)) {
 			/* TLP Workaround register. */
 			tmp = ssb_pcie_read(pc, 0x4);
 			tmp |= 0x8;
 			ssb_pcie_write(pc, 0x4, tmp);
 		}
 		if (pdev->id.revision == 0) {
 			const u8 serdes_rx_device = 0x1F;

 			ssb_pcie_mdio_write(pc, serdes_rx_device,
 					    2 /* Timer */, 0x8128);
 			ssb_pcie_mdio_write(pc, serdes_rx_device,
 					    6 /* CDR */, 0x0100);
 			ssb_pcie_mdio_write(pc, serdes_rx_device,
 					    7 /* CDR BW */, 0x1466);
 		} else if (pdev->id.revision == 1) {
 			/* DLLP Link Control register. */
 			tmp = ssb_pcie_read(pc, 0x100);
 			tmp |= 0x40;
 			ssb_pcie_write(pc, 0x100, tmp);
 		}
 	}
 	pc->setup_done = 1;
 out:
 	return err;
 }
 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);
	/*
	* Sonics Silicon Backplane
	* Broadcom PCI-core driver
	*
	* Copyright 2005, Broadcom Corporation
	* Copyright 2006, 2007, Michael Buesch <[email protected]>
	*
	* Licensed under the GNU/GPL. See COPYING for details.
	*/

	#include <linux/ssb/ssb.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/ssb/ssb_embedded.h>

	#include "ssb_private.h"


	static inline
	u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
	{
	return ssb_read32(pc->dev, offset);
	}

	static inline
	void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
	{
	ssb_write32(pc->dev, offset, value);
	}

	static inline
	u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
	{
	return ssb_read16(pc->dev, offset);
	}

	static inline
	void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
	{
	ssb_write16(pc->dev, offset, value);
	}

	/**************************************************
	* Code for hostmode operation.
	**************************************************/

	#ifdef CONFIG_SSB_PCICORE_HOSTMODE

	#include <asm/paccess.h>
	/* Probe a 32bit value on the bus and catch bus exceptions.
	* Returns nonzero on a bus exception.
	* This is MIPS specific */
	#define mips_busprobe32(val, addr) get_dbe((val), ((u32 *)(addr)))

	/* Assume one-hot slot wiring */
	#define SSB_PCI_SLOT_MAX 16

	/* Global lock is OK, as we won't have more than one extpci anyway. */
	static DEFINE_SPINLOCK(cfgspace_lock);
	/* Core to access the external PCI config space. Can only have one. */
	static struct ssb_pcicore *extpci_core;


	static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
	unsigned int bus, unsigned int dev,
	unsigned int func, unsigned int off)
	{
	u32 addr = 0;
	u32 tmp;

	/* We do only have one cardbus device behind the bridge. */
	if (pc->cardbusmode && (dev >= 1))
	goto out;

	if (bus == 0) {
	/* Type 0 transaction */
	if (unlikely(dev >= SSB_PCI_SLOT_MAX))
	goto out;
	/* Slide the window */
	tmp = SSB_PCICORE_SBTOPCI_CFG0;
	tmp \|= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
	/* Calculate the address */
	addr = SSB_PCI_CFG;
	addr \|= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
	addr \|= (func << 8);
	addr \|= (off & ~3);
	} else {
	/* Type 1 transaction */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
	SSB_PCICORE_SBTOPCI_CFG1);
	/* Calculate the address */
	addr = SSB_PCI_CFG;
	addr \|= (bus << 16);
	addr \|= (dev << 11);
	addr \|= (func << 8);
	addr \|= (off & ~3);
	}
	out:
	return addr;
	}

	static int ssb_extpci_read_config(struct ssb_pcicore *pc,
	unsigned int bus, unsigned int dev,
	unsigned int func, unsigned int off,
	void *buf, int len)
	{
	int err = -EINVAL;
	u32 addr, val;
	void __iomem *mmio;

	SSB_WARN_ON(!pc->hostmode);
	if (unlikely(len != 1 && len != 2 && len != 4))
	goto out;
	addr = get_cfgspace_addr(pc, bus, dev, func, off);
	if (unlikely(!addr))
	goto out;
	err = -ENOMEM;
	mmio = ioremap_nocache(addr, len);
	if (!mmio)
	goto out;

	if (mips_busprobe32(val, mmio)) {
	val = 0xffffffff;
	goto unmap;
	}

	val = readl(mmio);
	val >>= (8 * (off & 3));

	switch (len) {
	case 1:
	((u8 )buf) = (u8)val;
	break;
	case 2:
	((u16 )buf) = (u16)val;
	break;
	case 4:
	((u32 )buf) = (u32)val;
	break;
	}
	err = 0;
	unmap:
	iounmap(mmio);
	out:
	return err;
	}

	static int ssb_extpci_write_config(struct ssb_pcicore *pc,
	unsigned int bus, unsigned int dev,
	unsigned int func, unsigned int off,
	const void *buf, int len)
	{
	int err = -EINVAL;
	u32 addr, val = 0;
	void __iomem *mmio;

	SSB_WARN_ON(!pc->hostmode);
	if (unlikely(len != 1 && len != 2 && len != 4))
	goto out;
	addr = get_cfgspace_addr(pc, bus, dev, func, off);
	if (unlikely(!addr))
	goto out;
	err = -ENOMEM;
	mmio = ioremap_nocache(addr, len);
	if (!mmio)
	goto out;

	if (mips_busprobe32(val, mmio)) {
	val = 0xffffffff;
	goto unmap;
	}

	switch (len) {
	case 1:
	val = readl(mmio);
	val &= ~(0xFF << (8 * (off & 3)));
	val \|= ((const u8 )buf) << (8 * (off & 3));
	break;
	case 2:
	val = readl(mmio);
	val &= ~(0xFFFF << (8 * (off & 3)));
	val \|= ((const u16 )buf) << (8 * (off & 3));
	break;
	case 4:
	val = ((const u32 )buf);
	break;
	}
	writel(val, mmio);

	err = 0;
	unmap:
	iounmap(mmio);
	out:
	return err;
	}

	static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
	int reg, int size, u32 *val)
	{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&cfgspace_lock, flags);
	err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
	PCI_FUNC(devfn), reg, val, size);
	spin_unlock_irqrestore(&cfgspace_lock, flags);

	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
	}

	static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
	int reg, int size, u32 val)
	{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&cfgspace_lock, flags);
	err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
	PCI_FUNC(devfn), reg, &val, size);
	spin_unlock_irqrestore(&cfgspace_lock, flags);

	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops ssb_pcicore_pciops = {
	.read = ssb_pcicore_read_config,
	.write = ssb_pcicore_write_config,
	};

	static struct resource ssb_pcicore_mem_resource = {
	.name = "SSB PCIcore external memory",
	.start = SSB_PCI_DMA,
	.end = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
	.flags = IORESOURCE_MEM \| IORESOURCE_PCI_FIXED,
	};

	static struct resource ssb_pcicore_io_resource = {
	.name = "SSB PCIcore external I/O",
	.start = 0x100,
	.end = 0x7FF,
	.flags = IORESOURCE_IO \| IORESOURCE_PCI_FIXED,
	};

	static struct pci_controller ssb_pcicore_controller = {
	.pci_ops = &ssb_pcicore_pciops,
	.io_resource = &ssb_pcicore_io_resource,
	.mem_resource = &ssb_pcicore_mem_resource,
	.mem_offset = 0x24000000,
	};

	static u32 ssb_pcicore_pcibus_iobase = 0x100;
	static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA;

	/* This function is called when doing a pci_enable_device().
	* We must first check if the device is a device on the PCI-core bridge. */
	int ssb_pcicore_plat_dev_init(struct pci_dev *d)
	{
	struct resource *res;
	int pos, size;
	u32 *base;

	if (d->bus->ops != &ssb_pcicore_pciops) {
	/* This is not a device on the PCI-core bridge. */
	return -ENODEV;
	}

	ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
	pci_name(d));

	/* Fix up resource bases */
	for (pos = 0; pos < 6; pos++) {
	res = &d->resource[pos];
	if (res->flags & IORESOURCE_IO)
	base = &ssb_pcicore_pcibus_iobase;
	else
	base = &ssb_pcicore_pcibus_membase;
	res->flags \|= IORESOURCE_PCI_FIXED;
	if (res->end) {
	size = res->end - res->start + 1;
	if (*base & (size - 1))
	base = (base + size) & ~(size - 1);
	res->start = *base;
	res->end = res->start + size - 1;
	*base += size;
	pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start);
	}
	/* Fix up PCI bridge BAR0 only */
	if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0)
	break;
	}
	/* Fix up interrupt lines */
	d->irq = ssb_mips_irq(extpci_core->dev) + 2;
	pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);

	return 0;
	}

	/* Early PCI fixup for a device on the PCI-core bridge. */
	static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
	{
	u8 lat;

	if (dev->bus->ops != &ssb_pcicore_pciops) {
	/* This is not a device on the PCI-core bridge. */
	return;
	}
	if (dev->bus->number != 0 \|\| PCI_SLOT(dev->devfn) != 0)
	return;

	ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));

	/* Enable PCI bridge bus mastering and memory space */
	pci_set_master(dev);
	if (pcibios_enable_device(dev, ~0) < 0) {
	ssb_printk(KERN_ERR "PCI: SSB bridge enable failed\n");
	return;
	}

	/* Enable PCI bridge BAR1 prefetch and burst */
	pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);

	/* Make sure our latency is high enough to handle the devices behind us */
	lat = 168;
	ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
	pci_name(dev), lat);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
	}
	DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);

	/* PCI device IRQ mapping. */
	int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
	{
	if (dev->bus->ops != &ssb_pcicore_pciops) {
	/* This is not a device on the PCI-core bridge. */
	return -ENODEV;
	}
	return ssb_mips_irq(extpci_core->dev) + 2;
	}

	static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
	{
	u32 val;

	if (WARN_ON(extpci_core))
	return;
	extpci_core = pc;

	ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
	/* Reset devices on the external PCI bus */
	val = SSB_PCICORE_CTL_RST_OE;
	val \|= SSB_PCICORE_CTL_CLK_OE;
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	val \|= SSB_PCICORE_CTL_CLK; /* Clock on */
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	udelay(150); /* Assertion time demanded by the PCI standard */
	val \|= SSB_PCICORE_CTL_RST; /* Deassert RST# */
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	val = SSB_PCICORE_ARBCTL_INTERN;
	pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
	udelay(1); /* Assertion time demanded by the PCI standard */

	if (pc->dev->bus->has_cardbus_slot) {
	ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n");
	pc->cardbusmode = 1;
	/* GPIO 1 resets the bridge */
	ssb_gpio_out(pc->dev->bus, 1, 1);
	ssb_gpio_outen(pc->dev->bus, 1, 1);
	pcicore_write16(pc, SSB_PCICORE_SPROM(0),
	pcicore_read16(pc, SSB_PCICORE_SPROM(0))
	\| 0x0400);
	}

	/* 64MB I/O window */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
	SSB_PCICORE_SBTOPCI_IO);
	/* 64MB config space */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
	SSB_PCICORE_SBTOPCI_CFG0);
	/* 1GB memory window */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
	SSB_PCICORE_SBTOPCI_MEM \| SSB_PCI_DMA);

	/* Enable PCI bridge BAR0 prefetch and burst */
	val = PCI_COMMAND_MASTER \| PCI_COMMAND_MEMORY;
	ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
	/* Clear error conditions */
	val = 0;
	ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);

	/* Enable PCI interrupts */
	pcicore_write32(pc, SSB_PCICORE_IMASK,
	SSB_PCICORE_IMASK_INTA);

	/* Ok, ready to run, register it to the system.
	* The following needs change, if we want to port hostmode
	* to non-MIPS platform. */
	ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
	set_io_port_base(ssb_pcicore_controller.io_map_base);
	/* Give some time to the PCI controller to configure itself with the new
	* values. Not waiting at this point causes crashes of the machine. */
	mdelay(10);
	register_pci_controller(&ssb_pcicore_controller);
	}

	static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
	{
	struct ssb_bus *bus = pc->dev->bus;
	u16 chipid_top;
	u32 tmp;

	chipid_top = (bus->chip_id & 0xFF00);
	if (chipid_top != 0x4700 &&
	chipid_top != 0x5300)
	return 0;

	if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
	return 0;

	/* The 200-pin BCM4712 package does not bond out PCI. Even when
	* PCI is bonded out, some boards may leave the pins floating. */
	if (bus->chip_id == 0x4712) {
	if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
	return 0;
	if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
	return 0;
	}
	if (bus->chip_id == 0x5350)
	return 0;

	return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
	}
	#endif /* CONFIG_SSB_PCICORE_HOSTMODE */


	/**************************************************
	* Generic and Clientmode operation code.
	**************************************************/

	static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
	{
	/* Disable PCI interrupts. */
	ssb_write32(pc->dev, SSB_INTVEC, 0);
	}

	void ssb_pcicore_init(struct ssb_pcicore *pc)
	{
	struct ssb_device *dev = pc->dev;
	struct ssb_bus *bus;

	if (!dev)
	return;
	bus = dev->bus;
	if (!ssb_device_is_enabled(dev))
	ssb_device_enable(dev, 0);

	#ifdef CONFIG_SSB_PCICORE_HOSTMODE
	pc->hostmode = pcicore_is_in_hostmode(pc);
	if (pc->hostmode)
	ssb_pcicore_init_hostmode(pc);
	#endif /* CONFIG_SSB_PCICORE_HOSTMODE */
	if (!pc->hostmode)
	ssb_pcicore_init_clientmode(pc);
	}

	static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
	{
	pcicore_write32(pc, 0x130, address);
	return pcicore_read32(pc, 0x134);
	}

	static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
	{
	pcicore_write32(pc, 0x130, address);
	pcicore_write32(pc, 0x134, data);
	}

	static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
	u8 address, u16 data)
	{
	const u16 mdio_control = 0x128;
	const u16 mdio_data = 0x12C;
	u32 v;
	int i;

	v = 0x80; /* Enable Preamble Sequence */
	v \|= 0x2; /* MDIO Clock Divisor */
	pcicore_write32(pc, mdio_control, v);

	v = (1 << 30); /* Start of Transaction */
	v \|= (1 << 28); /* Write Transaction */
	v \|= (1 << 17); /* Turnaround */
	v \|= (u32)device << 22;
	v \|= (u32)address << 18;
	v \|= data;
	pcicore_write32(pc, mdio_data, v);
	/* Wait for the device to complete the transaction */
	udelay(10);
	for (i = 0; i < 10; i++) {
	v = pcicore_read32(pc, mdio_control);
	if (v & 0x100 /* Trans complete */)
	break;
	msleep(1);
	}
	pcicore_write32(pc, mdio_control, 0);
	}

	static void ssb_broadcast_value(struct ssb_device *dev,
	u32 address, u32 data)
	{
	/* This is used for both, PCI and ChipCommon core, so be careful. */
	BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
	BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);

	ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
	ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
	ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
	ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
	}

	static void ssb_commit_settings(struct ssb_bus *bus)
	{
	struct ssb_device *dev;

	dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
	if (WARN_ON(!dev))
	return;
	/* This forces an update of the cached registers. */
	ssb_broadcast_value(dev, 0xFD8, 0);
	}

	int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
	struct ssb_device *dev)
	{
	struct ssb_device *pdev = pc->dev;
	struct ssb_bus *bus;
	int err = 0;
	u32 tmp;

	if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
	/* This SSB device is not on a PCI host-bus. So the IRQs are
	* not routed through the PCI core.
	* So we must not enable routing through the PCI core. */
	goto out;
	}

	if (!pdev)
	goto out;
	bus = pdev->bus;

	might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);

	/* Enable interrupts for this device. */
	if (bus->host_pci &&
	((pdev->id.revision >= 6) \|\| (pdev->id.coreid == SSB_DEV_PCIE))) {
	u32 coremask;

	/* Calculate the "coremask" for the device. */
	coremask = (1 << dev->core_index);

	err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
	if (err)
	goto out;
	tmp \|= coremask << 8;
	err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
	if (err)
	goto out;
	} else {
	u32 intvec;

	intvec = ssb_read32(pdev, SSB_INTVEC);
	tmp = ssb_read32(dev, SSB_TPSFLAG);
	tmp &= SSB_TPSFLAG_BPFLAG;
	intvec \|= (1 << tmp);
	ssb_write32(pdev, SSB_INTVEC, intvec);
	}

	/* Setup PCIcore operation. */
	if (pc->setup_done)
	goto out;
	if (pdev->id.coreid == SSB_DEV_PCI) {
	tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
	tmp \|= SSB_PCICORE_SBTOPCI_PREF;
	tmp \|= SSB_PCICORE_SBTOPCI_BURST;
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);

	if (pdev->id.revision < 5) {
	tmp = ssb_read32(pdev, SSB_IMCFGLO);
	tmp &= ~SSB_IMCFGLO_SERTO;
	tmp \|= 2;
	tmp &= ~SSB_IMCFGLO_REQTO;
	tmp \|= 3 << SSB_IMCFGLO_REQTO_SHIFT;
	ssb_write32(pdev, SSB_IMCFGLO, tmp);
	ssb_commit_settings(bus);
	} else if (pdev->id.revision >= 11) {
	tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
	tmp \|= SSB_PCICORE_SBTOPCI_MRM;
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
	}
	} else {
	WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
	//TODO: Better make defines for all these magic PCIE values.
	if ((pdev->id.revision == 0) \|\| (pdev->id.revision == 1)) {
	/* TLP Workaround register. */
	tmp = ssb_pcie_read(pc, 0x4);
	tmp \|= 0x8;
	ssb_pcie_write(pc, 0x4, tmp);
	}
	if (pdev->id.revision == 0) {
	const u8 serdes_rx_device = 0x1F;

	ssb_pcie_mdio_write(pc, serdes_rx_device,
	2 /* Timer */, 0x8128);
	ssb_pcie_mdio_write(pc, serdes_rx_device,
	6 /* CDR */, 0x0100);
	ssb_pcie_mdio_write(pc, serdes_rx_device,
	7 /* CDR BW */, 0x1466);
	} else if (pdev->id.revision == 1) {
	/* DLLP Link Control register. */
	tmp = ssb_pcie_read(pc, 0x100);
	tmp \|= 0x40;
	ssb_pcie_write(pc, 0x100, tmp);
	}
	}
	pc->setup_done = 1;
	out:
	return err;
	}
	EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);