bcma: add PCIe host controller

Some SoCs have a PCIe host controller to make it possible to attach
some other devices to it, like an other Wifi card.
This code was tested with an Netgear WNDR3400 (bcm4716 based), but
should work with all bcma based SoCs.

Signed-off-by: Hauke Mehrtens <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

arch/mips/pci/pci-bcm47xx.c

···
 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/ssb/ssb.h>
+#include <linux/bcma/bcma.h>
 #include <bcm47xx.h>
 
 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
···
 	return 0;
 }
 
-int pcibios_plat_dev_init(struct pci_dev *dev)
-{
 #ifdef CONFIG_BCM47XX_SSB
+static int bcm47xx_pcibios_plat_dev_init_ssb(struct pci_dev *dev)
+{
 	int res;
 	u8 slot, pin;
-
-	if (bcm47xx_bus_type !=  BCM47XX_BUS_TYPE_SSB)
-		return 0;
 
 	res = ssb_pcibios_plat_dev_init(dev);
 	if (res < 0) {
···
 	}
 
 	dev->irq = res;
-#endif
 	return 0;
+}
+#endif
+
+#ifdef CONFIG_BCM47XX_BCMA
+static int bcm47xx_pcibios_plat_dev_init_bcma(struct pci_dev *dev)
+{
+	int res;
+
+	res = bcma_core_pci_plat_dev_init(dev);
+	if (res < 0) {
+		printk(KERN_ALERT "PCI: Failed to init device %s\n",
+		       pci_name(dev));
+		return res;
+	}
+
+	res = bcma_core_pci_pcibios_map_irq(dev);
+
+	/* IRQ-0 and IRQ-1 are software interrupts. */
+	if (res < 2) {
+		printk(KERN_ALERT "PCI: Failed to map IRQ of device %s\n",
+		       pci_name(dev));
+		return res;
+	}
+
+	dev->irq = res;
+	return 0;
+}
+#endif
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+#ifdef CONFIG_BCM47XX_SSB
+	if (bcm47xx_bus_type ==  BCM47XX_BUS_TYPE_SSB)
+		return bcm47xx_pcibios_plat_dev_init_ssb(dev);
+	else
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	if  (bcm47xx_bus_type ==  BCM47XX_BUS_TYPE_BCMA)
+		return bcm47xx_pcibios_plat_dev_init_bcma(dev);
+	else
+#endif
+		return 0;
 }

drivers/bcma/bcma_private.h

···
 u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address);
 
 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+bool __devinit bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc);
 void __devinit bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc);
 #endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
 

drivers/bcma/driver_pci.c

···
  * Broadcom specific AMBA
  * PCI Core
  *
- * Copyright 2005, Broadcom Corporation
+ * Copyright 2005, 2011, Broadcom Corporation
  * Copyright 2006, 2007, Michael Buesch <[e-mail]>
  * Copyright 2011, 2012, Hauke Mehrtens <[e-mail]>
  *
···
 	bcma_pcicore_serdes_workaround(pc);
 }
 
-static bool __devinit bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc)
-{
-	struct bcma_bus *bus = pc->core->bus;
-	u16 chipid_top;
-
-	chipid_top = (bus->chipinfo.id & 0xFF00);
-	if (chipid_top != 0x4700 &&
-	    chipid_top != 0x5300)
-		return false;
-
-#ifdef CONFIG_SSB_DRIVER_PCICORE
-	if (bus->sprom.boardflags_lo & SSB_BFL_NOPCI)
-		return false;
-#endif /* CONFIG_SSB_DRIVER_PCICORE */
-
-#if 0
-	/* TODO: on BCMA we use address from EROM instead of magic formula */
-	u32 tmp;
-	return !mips_busprobe32(tmp, (bus->mmio +
-		(pc->core->core_index * BCMA_CORE_SIZE)));
-#endif
-
-	return true;
-}
-
 void __devinit bcma_core_pci_init(struct bcma_drv_pci *pc)
 {
 	if (pc->setup_done)
 		return;
 
-	if (bcma_core_pci_is_in_hostmode(pc)) {
 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+	pc->hostmode = bcma_core_pci_is_in_hostmode(pc);
+	if (pc->hostmode)
 		bcma_core_pci_hostmode_init(pc);
-#else
-		pr_err("Driver compiled without support for hostmode PCI\n");
 #endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
-	} else {
-		bcma_core_pci_clientmode_init(pc);
-	}
 
-	pc->setup_done = true;
+	if (!pc->hostmode)
+		bcma_core_pci_clientmode_init(pc);
 }
 
 int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,

drivers/bcma/driver_pci_host.c

···
  * Broadcom specific AMBA
  * PCI Core in hostmode
  *
+ * Copyright 2005 - 2011, Broadcom Corporation
+ * Copyright 2006, 2007, Michael Buesch <[e-mail]>
+ * Copyright 2011, 2012, Hauke Mehrtens <[e-mail]>
+ *
  * Licensed under the GNU/GPL. See COPYING for details.
  */
 
 #include "bcma_private.h"
+#include <linux/export.h>
 #include <linux/bcma/bcma.h>
+#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 BCMA_PCI_SLOT_MAX	16
+#define	PCI_CONFIG_SPACE_SIZE	256
+
+bool __devinit bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc)
+{
+	struct bcma_bus *bus = pc->core->bus;
+	u16 chipid_top;
+	u32 tmp;
+
+	chipid_top = (bus->chipinfo.id & 0xFF00);
+	if (chipid_top != 0x4700 &&
+	    chipid_top != 0x5300)
+		return false;
+
+	if (bus->sprom.boardflags_lo & BCMA_CORE_PCI_BFL_NOPCI) {
+		pr_info("This PCI core is disabled and not working\n");
+		return false;
+	}
+
+	bcma_core_enable(pc->core, 0);
+
+	return !mips_busprobe32(tmp, pc->core->io_addr);
+}
+
+static u32 bcma_pcie_read_config(struct bcma_drv_pci *pc, u32 address)
+{
+	pcicore_write32(pc, BCMA_CORE_PCI_CONFIG_ADDR, address);
+	pcicore_read32(pc, BCMA_CORE_PCI_CONFIG_ADDR);
+	return pcicore_read32(pc, BCMA_CORE_PCI_CONFIG_DATA);
+}
+
+static void bcma_pcie_write_config(struct bcma_drv_pci *pc, u32 address,
+				   u32 data)
+{
+	pcicore_write32(pc, BCMA_CORE_PCI_CONFIG_ADDR, address);
+	pcicore_read32(pc, BCMA_CORE_PCI_CONFIG_ADDR);
+	pcicore_write32(pc, BCMA_CORE_PCI_CONFIG_DATA, data);
+}
+
+static u32 bcma_get_cfgspace_addr(struct bcma_drv_pci *pc, unsigned int dev,
+			     unsigned int func, unsigned int off)
+{
+	u32 addr = 0;
+
+	/* Issue config commands only when the data link is up (atleast
+	 * one external pcie device is present).
+	 */
+	if (dev >= 2 || !(bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_LSREG)
+			  & BCMA_CORE_PCI_DLLP_LSREG_LINKUP))
+		goto out;
+
+	/* Type 0 transaction */
+	/* Slide the PCI window to the appropriate slot */
+	pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI1, BCMA_CORE_PCI_SBTOPCI_CFG0);
+	/* Calculate the address */
+	addr = pc->host_controller->host_cfg_addr;
+	addr |= (dev << BCMA_CORE_PCI_CFG_SLOT_SHIFT);
+	addr |= (func << BCMA_CORE_PCI_CFG_FUN_SHIFT);
+	addr |= (off & ~3);
+
+out:
+	return addr;
+}
+
+static int bcma_extpci_read_config(struct bcma_drv_pci *pc, unsigned int dev,
+				  unsigned int func, unsigned int off,
+				  void *buf, int len)
+{
+	int err = -EINVAL;
+	u32 addr, val;
+	void __iomem *mmio = 0;
+
+	WARN_ON(!pc->hostmode);
+	if (unlikely(len != 1 && len != 2 && len != 4))
+		goto out;
+	if (dev == 0) {
+		/* we support only two functions on device 0 */
+		if (func > 1)
+			return -EINVAL;
+
+		/* accesses to config registers with offsets >= 256
+		 * requires indirect access.
+		 */
+		if (off >= PCI_CONFIG_SPACE_SIZE) {
+			addr = (func << 12);
+			addr |= (off & 0x0FFF);
+			val = bcma_pcie_read_config(pc, addr);
+		} else {
+			addr = BCMA_CORE_PCI_PCICFG0;
+			addr |= (func << 8);
+			addr |= (off & 0xfc);
+			val = pcicore_read32(pc, addr);
+		}
+	} else {
+		addr = bcma_get_cfgspace_addr(pc, 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:
+	if (mmio)
+		iounmap(mmio);
+out:
+	return err;
+}
+
+static int bcma_extpci_write_config(struct bcma_drv_pci *pc, unsigned int dev,
+				   unsigned int func, unsigned int off,
+				   const void *buf, int len)
+{
+	int err = -EINVAL;
+	u32 addr = 0, val = 0;
+	void __iomem *mmio = 0;
+	u16 chipid = pc->core->bus->chipinfo.id;
+
+	WARN_ON(!pc->hostmode);
+	if (unlikely(len != 1 && len != 2 && len != 4))
+		goto out;
+	if (dev == 0) {
+		/* accesses to config registers with offsets >= 256
+		 * requires indirect access.
+		 */
+		if (off < PCI_CONFIG_SPACE_SIZE) {
+			addr = pc->core->addr + BCMA_CORE_PCI_PCICFG0;
+			addr |= (func << 8);
+			addr |= (off & 0xfc);
+			mmio = ioremap_nocache(addr, len);
+			if (!mmio)
+				goto out;
+		}
+	} else {
+		addr = bcma_get_cfgspace_addr(pc, 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;
+	}
+	if (dev == 0 && !addr) {
+		/* accesses to config registers with offsets >= 256
+		 * requires indirect access.
+		 */
+		addr = (func << 12);
+		addr |= (off & 0x0FFF);
+		bcma_pcie_write_config(pc, addr, val);
+	} else {
+		writel(val, mmio);
+
+		if (chipid == 0x4716 || chipid == 0x4748)
+			readl(mmio);
+	}
+
+	err = 0;
+unmap:
+	if (mmio)
+		iounmap(mmio);
+out:
+	return err;
+}
+
+static int bcma_core_pci_hostmode_read_config(struct pci_bus *bus,
+					      unsigned int devfn,
+					      int reg, int size, u32 *val)
+{
+	unsigned long flags;
+	int err;
+	struct bcma_drv_pci *pc;
+	struct bcma_drv_pci_host *pc_host;
+
+	pc_host = container_of(bus->ops, struct bcma_drv_pci_host, pci_ops);
+	pc = pc_host->pdev;
+
+	spin_lock_irqsave(&pc_host->cfgspace_lock, flags);
+	err = bcma_extpci_read_config(pc, PCI_SLOT(devfn),
+				     PCI_FUNC(devfn), reg, val, size);
+	spin_unlock_irqrestore(&pc_host->cfgspace_lock, flags);
+
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+}
+
+static int bcma_core_pci_hostmode_write_config(struct pci_bus *bus,
+					       unsigned int devfn,
+					       int reg, int size, u32 val)
+{
+	unsigned long flags;
+	int err;
+	struct bcma_drv_pci *pc;
+	struct bcma_drv_pci_host *pc_host;
+
+	pc_host = container_of(bus->ops, struct bcma_drv_pci_host, pci_ops);
+	pc = pc_host->pdev;
+
+	spin_lock_irqsave(&pc_host->cfgspace_lock, flags);
+	err = bcma_extpci_write_config(pc, PCI_SLOT(devfn),
+				      PCI_FUNC(devfn), reg, &val, size);
+	spin_unlock_irqrestore(&pc_host->cfgspace_lock, flags);
+
+	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
+}
+
+/* return cap_offset if requested capability exists in the PCI config space */
+static u8 __devinit bcma_find_pci_capability(struct bcma_drv_pci *pc,
+					     unsigned int dev,
+					     unsigned int func, u8 req_cap_id,
+					     unsigned char *buf, u32 *buflen)
+{
+	u8 cap_id;
+	u8 cap_ptr = 0;
+	u32 bufsize;
+	u8 byte_val;
+
+	/* check for Header type 0 */
+	bcma_extpci_read_config(pc, dev, func, PCI_HEADER_TYPE, &byte_val,
+				sizeof(u8));
+	if ((byte_val & 0x7f) != PCI_HEADER_TYPE_NORMAL)
+		return cap_ptr;
+
+	/* check if the capability pointer field exists */
+	bcma_extpci_read_config(pc, dev, func, PCI_STATUS, &byte_val,
+				sizeof(u8));
+	if (!(byte_val & PCI_STATUS_CAP_LIST))
+		return cap_ptr;
+
+	/* check if the capability pointer is 0x00 */
+	bcma_extpci_read_config(pc, dev, func, PCI_CAPABILITY_LIST, &cap_ptr,
+				sizeof(u8));
+	if (cap_ptr == 0x00)
+		return cap_ptr;
+
+	/* loop thr'u the capability list and see if the requested capabilty
+	 * exists */
+	bcma_extpci_read_config(pc, dev, func, cap_ptr, &cap_id, sizeof(u8));
+	while (cap_id != req_cap_id) {
+		bcma_extpci_read_config(pc, dev, func, cap_ptr + 1, &cap_ptr,
+					sizeof(u8));
+		if (cap_ptr == 0x00)
+			return cap_ptr;
+		bcma_extpci_read_config(pc, dev, func, cap_ptr, &cap_id,
+					sizeof(u8));
+	}
+
+	/* found the caller requested capability */
+	if ((buf != NULL) && (buflen != NULL)) {
+		u8 cap_data;
+
+		bufsize = *buflen;
+		if (!bufsize)
+			return cap_ptr;
+
+		*buflen = 0;
+
+		/* copy the cpability data excluding cap ID and next ptr */
+		cap_data = cap_ptr + 2;
+		if ((bufsize + cap_data)  > PCI_CONFIG_SPACE_SIZE)
+			bufsize = PCI_CONFIG_SPACE_SIZE - cap_data;
+		*buflen = bufsize;
+		while (bufsize--) {
+			bcma_extpci_read_config(pc, dev, func, cap_data, buf,
+						sizeof(u8));
+			cap_data++;
+			buf++;
+		}
+	}
+
+	return cap_ptr;
+}
+
+/* If the root port is capable of returning Config Request
+ * Retry Status (CRS) Completion Status to software then
+ * enable the feature.
+ */
+static void __devinit bcma_core_pci_enable_crs(struct bcma_drv_pci *pc)
+{
+	u8 cap_ptr, root_ctrl, root_cap, dev;
+	u16 val16;
+	int i;
+
+	cap_ptr = bcma_find_pci_capability(pc, 0, 0, PCI_CAP_ID_EXP, NULL,
+					   NULL);
+	root_cap = cap_ptr + PCI_EXP_RTCAP;
+	bcma_extpci_read_config(pc, 0, 0, root_cap, &val16, sizeof(u16));
+	if (val16 & BCMA_CORE_PCI_RC_CRS_VISIBILITY) {
+		/* Enable CRS software visibility */
+		root_ctrl = cap_ptr + PCI_EXP_RTCTL;
+		val16 = PCI_EXP_RTCTL_CRSSVE;
+		bcma_extpci_read_config(pc, 0, 0, root_ctrl, &val16,
+					sizeof(u16));
+
+		/* Initiate a configuration request to read the vendor id
+		 * field of the device function's config space header after
+		 * 100 ms wait time from the end of Reset. If the device is
+		 * not done with its internal initialization, it must at
+		 * least return a completion TLP, with a completion status
+		 * of "Configuration Request Retry Status (CRS)". The root
+		 * complex must complete the request to the host by returning
+		 * a read-data value of 0001h for the Vendor ID field and
+		 * all 1s for any additional bytes included in the request.
+		 * Poll using the config reads for max wait time of 1 sec or
+		 * until we receive the successful completion status. Repeat
+		 * the procedure for all the devices.
+		 */
+		for (dev = 1; dev < BCMA_PCI_SLOT_MAX; dev++) {
+			for (i = 0; i < 100000; i++) {
+				bcma_extpci_read_config(pc, dev, 0,
+							PCI_VENDOR_ID, &val16,
+							sizeof(val16));
+				if (val16 != 0x1)
+					break;
+				udelay(10);
+			}
+			if (val16 == 0x1)
+				pr_err("PCI: Broken device in slot %d\n", dev);
+		}
+	}
+}
 
 void __devinit bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc)
 {
-	pr_err("No support for PCI core in hostmode yet\n");
+	struct bcma_bus *bus = pc->core->bus;
+	struct bcma_drv_pci_host *pc_host;
+	u32 tmp;
+	u32 pci_membase_1G;
+	unsigned long io_map_base;
+
+	pr_info("PCIEcore in host mode found\n");
+
+	pc_host = kzalloc(sizeof(*pc_host), GFP_KERNEL);
+	if (!pc_host)  {
+		pr_err("can not allocate memory");
+		return;
+	}
+
+	pc->host_controller = pc_host;
+	pc_host->pci_controller.io_resource = &pc_host->io_resource;
+	pc_host->pci_controller.mem_resource = &pc_host->mem_resource;
+	pc_host->pci_controller.pci_ops = &pc_host->pci_ops;
+	pc_host->pdev = pc;
+
+	pci_membase_1G = BCMA_SOC_PCI_DMA;
+	pc_host->host_cfg_addr = BCMA_SOC_PCI_CFG;
+
+	pc_host->pci_ops.read = bcma_core_pci_hostmode_read_config;
+	pc_host->pci_ops.write = bcma_core_pci_hostmode_write_config;
+
+	pc_host->mem_resource.name = "BCMA PCIcore external memory",
+	pc_host->mem_resource.start = BCMA_SOC_PCI_DMA;
+	pc_host->mem_resource.end = BCMA_SOC_PCI_DMA + BCMA_SOC_PCI_DMA_SZ - 1;
+	pc_host->mem_resource.flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
+
+	pc_host->io_resource.name = "BCMA PCIcore external I/O",
+	pc_host->io_resource.start = 0x100;
+	pc_host->io_resource.end = 0x7FF;
+	pc_host->io_resource.flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED;
+
+	/* Reset RC */
+	udelay(3000);
+	pcicore_write32(pc, BCMA_CORE_PCI_CTL, BCMA_CORE_PCI_CTL_RST_OE);
+	udelay(1000);
+	pcicore_write32(pc, BCMA_CORE_PCI_CTL, BCMA_CORE_PCI_CTL_RST |
+			BCMA_CORE_PCI_CTL_RST_OE);
+
+	/* 64 MB I/O access window. On 4716, use
+	 * sbtopcie0 to access the device registers. We
+	 * can't use address match 2 (1 GB window) region
+	 * as mips can't generate 64-bit address on the
+	 * backplane.
+	 */
+	if (bus->chipinfo.id == 0x4716 || bus->chipinfo.id == 0x4748) {
+		pc_host->mem_resource.start = BCMA_SOC_PCI_MEM;
+		pc_host->mem_resource.end = BCMA_SOC_PCI_MEM +
+					    BCMA_SOC_PCI_MEM_SZ - 1;
+		pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI0,
+				BCMA_CORE_PCI_SBTOPCI_MEM | BCMA_SOC_PCI_MEM);
+	} else if (bus->chipinfo.id == 0x5300) {
+		tmp = BCMA_CORE_PCI_SBTOPCI_MEM;
+		tmp |= BCMA_CORE_PCI_SBTOPCI_PREF;
+		tmp |= BCMA_CORE_PCI_SBTOPCI_BURST;
+		if (pc->core->core_unit == 0) {
+			pc_host->mem_resource.start = BCMA_SOC_PCI_MEM;
+			pc_host->mem_resource.end = BCMA_SOC_PCI_MEM +
+						    BCMA_SOC_PCI_MEM_SZ - 1;
+			pci_membase_1G = BCMA_SOC_PCIE_DMA_H32;
+			pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI0,
+					tmp | BCMA_SOC_PCI_MEM);
+		} else if (pc->core->core_unit == 1) {
+			pc_host->mem_resource.start = BCMA_SOC_PCI1_MEM;
+			pc_host->mem_resource.end = BCMA_SOC_PCI1_MEM +
+						    BCMA_SOC_PCI_MEM_SZ - 1;
+			pci_membase_1G = BCMA_SOC_PCIE1_DMA_H32;
+			pc_host->host_cfg_addr = BCMA_SOC_PCI1_CFG;
+			pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI0,
+					tmp | BCMA_SOC_PCI1_MEM);
+		}
+	} else
+		pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI0,
+				BCMA_CORE_PCI_SBTOPCI_IO);
+
+	/* 64 MB configuration access window */
+	pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI1, BCMA_CORE_PCI_SBTOPCI_CFG0);
+
+	/* 1 GB memory access window */
+	pcicore_write32(pc, BCMA_CORE_PCI_SBTOPCI2,
+			BCMA_CORE_PCI_SBTOPCI_MEM | pci_membase_1G);
+
+
+	/* As per PCI Express Base Spec 1.1 we need to wait for
+	 * at least 100 ms from the end of a reset (cold/warm/hot)
+	 * before issuing configuration requests to PCI Express
+	 * devices.
+	 */
+	udelay(100000);
+
+	bcma_core_pci_enable_crs(pc);
+
+	/* Enable PCI bridge BAR0 memory & master access */
+	tmp = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
+	bcma_extpci_write_config(pc, 0, 0, PCI_COMMAND, &tmp, sizeof(tmp));
+
+	/* Enable PCI interrupts */
+	pcicore_write32(pc, BCMA_CORE_PCI_IMASK, BCMA_CORE_PCI_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. */
+	io_map_base = (unsigned long)ioremap_nocache(BCMA_SOC_PCI_MEM,
+						     0x04000000);
+	pc_host->pci_controller.io_map_base = io_map_base;
+	set_io_port_base(pc_host->pci_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(&pc_host->pci_controller);
+	return;
 }
+
+/* Early PCI fixup for a device on the PCI-core bridge. */
+static void bcma_core_pci_fixup_pcibridge(struct pci_dev *dev)
+{
+	if (dev->bus->ops->read != bcma_core_pci_hostmode_read_config) {
+		/* This is not a device on the PCI-core bridge. */
+		return;
+	}
+	if (PCI_SLOT(dev->devfn) != 0)
+		return;
+
+	pr_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) {
+		pr_err("PCI: BCMA bridge enable failed\n");
+		return;
+	}
+
+	/* Enable PCI bridge BAR1 prefetch and burst */
+	pci_write_config_dword(dev, BCMA_PCI_BAR1_CONTROL, 3);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, bcma_core_pci_fixup_pcibridge);
+
+/* Early PCI fixup for all PCI-cores to set the correct memory address. */
+static void bcma_core_pci_fixup_addresses(struct pci_dev *dev)
+{
+	struct resource *res;
+	int pos;
+
+	if (dev->bus->ops->read != bcma_core_pci_hostmode_read_config) {
+		/* This is not a device on the PCI-core bridge. */
+		return;
+	}
+	if (PCI_SLOT(dev->devfn) == 0)
+		return;
+
+	pr_info("PCI: Fixing up addresses %s\n", pci_name(dev));
+
+	for (pos = 0; pos < 6; pos++) {
+		res = &dev->resource[pos];
+		if (res->flags & (IORESOURCE_IO | IORESOURCE_MEM))
+			pci_assign_resource(dev, pos);
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, bcma_core_pci_fixup_addresses);
+
+/* 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 bcma_core_pci_plat_dev_init(struct pci_dev *dev)
+{
+	struct bcma_drv_pci_host *pc_host;
+
+	if (dev->bus->ops->read != bcma_core_pci_hostmode_read_config) {
+		/* This is not a device on the PCI-core bridge. */
+		return -ENODEV;
+	}
+	pc_host = container_of(dev->bus->ops, struct bcma_drv_pci_host,
+			       pci_ops);
+
+	pr_info("PCI: Fixing up device %s\n", pci_name(dev));
+
+	/* Fix up interrupt lines */
+	dev->irq = bcma_core_mips_irq(pc_host->pdev->core) + 2;
+	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+
+	return 0;
+}
+EXPORT_SYMBOL(bcma_core_pci_plat_dev_init);
+
+/* PCI device IRQ mapping. */
+int bcma_core_pci_pcibios_map_irq(const struct pci_dev *dev)
+{
+	struct bcma_drv_pci_host *pc_host;
+
+	if (dev->bus->ops->read != bcma_core_pci_hostmode_read_config) {
+		/* This is not a device on the PCI-core bridge. */
+		return -ENODEV;
+	}
+
+	pc_host = container_of(dev->bus->ops, struct bcma_drv_pci_host,
+			       pci_ops);
+	return bcma_core_mips_irq(pc_host->pdev->core) + 2;
+}
+EXPORT_SYMBOL(bcma_core_pci_pcibios_map_irq);

include/linux/bcma/bcma_driver_pci.h

···
 /* PCIcore specific boardflags */
 #define BCMA_CORE_PCI_BFL_NOPCI			0x00000400 /* Board leaves PCI floating */
 
+/* PCIE Config space accessing MACROS */
+#define BCMA_CORE_PCI_CFG_BUS_SHIFT		24	/* Bus shift */
+#define BCMA_CORE_PCI_CFG_SLOT_SHIFT		19	/* Slot/Device shift */
+#define BCMA_CORE_PCI_CFG_FUN_SHIFT		16	/* Function shift */
+#define BCMA_CORE_PCI_CFG_OFF_SHIFT		0	/* Register shift */
+
+#define BCMA_CORE_PCI_CFG_BUS_MASK		0xff	/* Bus mask */
+#define BCMA_CORE_PCI_CFG_SLOT_MASK		0x1f	/* Slot/Device mask */
+#define BCMA_CORE_PCI_CFG_FUN_MASK		7	/* Function mask */
+#define BCMA_CORE_PCI_CFG_OFF_MASK		0xfff	/* Register mask */
+
+/* PCIE Root Capability Register bits (Host mode only) */
+#define BCMA_CORE_PCI_RC_CRS_VISIBILITY		0x0001
+
+struct bcma_drv_pci;
+
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+struct bcma_drv_pci_host {
+	struct bcma_drv_pci *pdev;
+
+	u32 host_cfg_addr;
+	spinlock_t cfgspace_lock;
+
+	struct pci_controller pci_controller;
+	struct pci_ops pci_ops;
+	struct resource mem_resource;
+	struct resource io_resource;
+};
+#endif
+
 struct bcma_drv_pci {
 	struct bcma_device *core;
 	u8 setup_done:1;
+	u8 hostmode:1;
+
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+	struct bcma_drv_pci_host *host_controller;
+#endif
 };
 
 /* Register access */
···
 extern void __devinit bcma_core_pci_init(struct bcma_drv_pci *pc);
 extern int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc,
 				 struct bcma_device *core, bool enable);
+
+extern int bcma_core_pci_pcibios_map_irq(const struct pci_dev *dev);
+extern int bcma_core_pci_plat_dev_init(struct pci_dev *dev);
 
 #endif /* LINUX_BCMA_DRIVER_PCI_H_ */

include/linux/bcma/bcma_regs.h

···
 #define  BCMA_PCI_GPIO_XTAL		0x40	/* PCI config space GPIO 14 for Xtal powerup */
 #define  BCMA_PCI_GPIO_PLL		0x80	/* PCI config space GPIO 15 for PLL powerdown */
 
+/* SiliconBackplane Address Map.
+ * All regions may not exist on all chips.
+ */
+#define BCMA_SOC_SDRAM_BASE		0x00000000U	/* Physical SDRAM */
+#define BCMA_SOC_PCI_MEM		0x08000000U	/* Host Mode sb2pcitranslation0 (64 MB) */
+#define BCMA_SOC_PCI_MEM_SZ		(64 * 1024 * 1024)
+#define BCMA_SOC_PCI_CFG		0x0c000000U	/* Host Mode sb2pcitranslation1 (64 MB) */
+#define BCMA_SOC_SDRAM_SWAPPED		0x10000000U	/* Byteswapped Physical SDRAM */
+#define BCMA_SOC_SDRAM_R2		0x80000000U	/* Region 2 for sdram (512 MB) */
+
+
+#define BCMA_SOC_PCI_DMA		0x40000000U	/* Client Mode sb2pcitranslation2 (1 GB) */
+#define BCMA_SOC_PCI_DMA2		0x80000000U	/* Client Mode sb2pcitranslation2 (1 GB) */
+#define BCMA_SOC_PCI_DMA_SZ		0x40000000U	/* Client Mode sb2pcitranslation2 size in bytes */
+#define BCMA_SOC_PCIE_DMA_L32		0x00000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), low 32 bits
+							 */
+#define BCMA_SOC_PCIE_DMA_H32		0x80000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), high 32 bits
+							 */
+
+#define BCMA_SOC_PCI1_MEM		0x40000000U	/* Host Mode sb2pcitranslation0 (64 MB) */
+#define BCMA_SOC_PCI1_CFG		0x44000000U	/* Host Mode sb2pcitranslation1 (64 MB) */
+#define BCMA_SOC_PCIE1_DMA_H32		0xc0000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), high 32 bits
+							 */
+
 #endif /* LINUX_BCMA_REGS_H_ */