openwrt/target/linux/bcm53xx/patches-3.14/170-pcie2-bcma-add-new-PCIe2-driver-for-bcma.patch

From 7475eee716d11f487076f78f26a6e403c06d0c76 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Mon, 12 May 2014 11:55:20 +0200
Subject: [PATCH 14/15] pcie2-bcma: add new PCIe2 driver for bcma

This driver supports the PCIe controller found on the BCM4708 and
similar SoCs. The controller itself is automatically detected by bcma.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/arm/mach-bcm/Kconfig     |   1 +
 drivers/pci/host/Kconfig      |   7 +
 drivers/pci/host/Makefile     |   1 +
 drivers/pci/host/pcie2-bcma.c | 594 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 603 insertions(+)
 create mode 100644 drivers/pci/host/pcie2-bcma.c

--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -45,6 +45,7 @@ config ARCH_BCM_5301X
 	select ARM_GLOBAL_TIMER
 	select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
 	select MIGHT_HAVE_PCI
+	select PCI_DOMAINS if PCI
 	help
 	  Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
 
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -33,4 +33,11 @@ config PCI_RCAR_GEN2
 	  There are 3 internal PCI controllers available with a single
 	  built-in EHCI/OHCI host controller present on each one.
 
+config PCI_BCMA
+	bool "BCMA PCIe2 host controller"
+	depends on BCMA && OF
+	help
+	  Say Y here if you want to support a simple generic PCI host
+	  controller, such as the one emulated by kvmtool.
+
 endmenu
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
 obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
 obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
 obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
+obj-$(CONFIG_PCI_BCMA) += pcie2-bcma.o
--- /dev/null
+++ b/drivers/pci/host/pcie2-bcma.c
@@ -0,0 +1,594 @@
+/*
+ * Northstar PCI-Express driver
+ * Only supports Root-Complex (RC) mode
+ *
+ * Notes:
+ * PCI Domains are being used to identify the PCIe port 1:1.
+ *
+ * Only MEM access is supported, PAX does not support IO.
+ *
+ * TODO:
+ *	MSI interrupts,
+ *	DRAM > 128 MBytes (e.g. DMA zones)
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/bcma/bcma.h>
+
+#define SI_ENUM_BASE		0x18000000	/* Enumeration space base */
+
+/*
+ * Register offset definitions
+ */
+#define	SOC_PCIE_CONTROL	0x000	/* a.k.a. CLK_CONTROL reg */
+#define	SOC_PCIE_PM_STATUS	0x008
+#define	SOC_PCIE_PM_CONTROL	0x00c	/* in EP mode only ! */
+
+#define	SOC_PCIE_EXT_CFG_ADDR	0x120
+#define	SOC_PCIE_EXT_CFG_DATA	0x124
+#define	SOC_PCIE_CFG_ADDR	0x1f8
+#define	SOC_PCIE_CFG_DATA	0x1fc
+
+#define	SOC_PCIE_SYS_RC_INTX_EN		0x330
+#define	SOC_PCIE_SYS_RC_INTX_CSR	0x334
+#define	SOC_PCIE_SYS_HOST_INTR_EN	0x344
+#define	SOC_PCIE_SYS_HOST_INTR_CSR	0x348
+
+#define	SOC_PCIE_HDR_OFF	0x400	/* 256 bytes per function */
+
+/* 32-bit 4KB in-bound mapping windows for Function 0..3, n=0..7 */
+#define	SOC_PCIE_SYS_IMAP0(f, n)	(0xc00 + ((f) << 9)((n) << 2))
+/* 64-bit in-bound mapping windows for func 0..3 */
+#define	SOC_PCIE_SYS_IMAP1(f)		(0xc80 + ((f) << 3))
+#define	SOC_PCIE_SYS_IMAP2(f)		(0xcc0 + ((f) << 3))
+/* 64-bit in-bound address range n=0..2 */
+#define	SOC_PCIE_SYS_IARR(n)		(0xd00 + ((n) << 3))
+/* 64-bit out-bound address filter n=0..2 */
+#define	SOC_PCIE_SYS_OARR(n)		(0xd20 + ((n) << 3))
+/* 64-bit out-bound mapping windows n=0..2 */
+#define	SOC_PCIE_SYS_OMAP(n)		(0xd40 + ((n) << 3))
+
+#define BCM4360_D11AC_ID	0x43a0
+#define BCM4360_D11AC2G_ID	0x43a1
+#define BCM4360_D11AC5G_ID	0x43a2
+#define BCM4352_D11AC_ID	0x43b1	/* 4352 802.11ac dualband device */
+#define BCM4352_D11AC2G_ID	0x43b2	/* 4352 802.11ac 2.4G device */
+#define BCM4352_D11AC5G_ID	0x43b3	/* 4352 802.11ac 5G device */
+
+static int bcma_pcie2_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
+{
+	struct pci_sys_data *sys = pdev->sysdata;
+	struct bcma_device *bdev = sys->private_data;
+
+	return bdev->irq;
+}
+
+static u32 bcma_pcie2_cfg_base(struct bcma_device *bdev, int busno,
+			       unsigned int devfn, int where)
+{
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 addr_reg;
+
+	if (busno == 0) {
+		if (slot >= 1)
+			return 0;
+		bcma_write32(bdev, SOC_PCIE_EXT_CFG_ADDR, where & 0xffc);
+		return SOC_PCIE_EXT_CFG_DATA;
+	} else {
+		if (fn > 1)
+			return 0;
+		addr_reg = (busno & 0xff) << 20 | (slot << 15) | (fn << 12) |
+			   (where & 0xffc) | (1 & 0x3);
+
+		bcma_write32(bdev, SOC_PCIE_CFG_ADDR, addr_reg);
+		return SOC_PCIE_CFG_DATA;
+	}
+}
+
+static u32 bcma_pcie2_read_config(struct bcma_device *bdev, int busno,
+				  unsigned int devfn, int where, int size)
+{
+	u32 base;
+	u32 data_reg;
+
+	base = bcma_pcie2_cfg_base(bdev, busno, devfn, where);
+
+	if (!base)
+		return ~0UL;
+
+	data_reg = bcma_read32(bdev, base);
+
+	/* NS: CLASS field is R/O, and set to wrong 0x200 value */
+	if (busno == 0 && devfn == 0) {
+		/*
+		 * RC's class is 0x0280, but Linux PCI driver needs 0x604
+		 * for a PCIe bridge. So we must fixup the class code
+		 * to 0x604 here.
+		 */
+		if ((where & 0xffc) == PCI_CLASS_REVISION) {
+			data_reg &= 0xff;
+			data_reg |= 0x604 << 16;
+		}
+	}
+	/* HEADER_TYPE=00 indicates the port in EP mode */
+
+	if (size == 4) {
+		return data_reg;
+	} else {
+		u32 mask = (1 << (size * 8)) - 1;
+		int shift = (where % 4) * 8;
+		return (data_reg >> shift) & mask;
+	}
+}
+
+static void bcma_pcie2_write_config(struct bcma_device *bdev, int busno,
+				    unsigned int devfn, int where, int size,
+				    u32 val)
+{
+	u32 base;
+	u32 data_reg;
+
+	base = bcma_pcie2_cfg_base(bdev, busno, devfn, where);
+
+	if (!base)
+		return;
+
+	if (size < 4) {
+		u32 mask = (1 << (size * 8)) - 1;
+		int shift = (where % 4) * 8;
+		data_reg = bcma_read32(bdev, base);
+		data_reg &= ~(mask << shift);
+		data_reg |= (val & mask) << shift;
+	} else {
+		data_reg = val;
+	}
+
+	bcma_write32(bdev, base, data_reg);
+}
+
+static u8 bcma_pcie2_read_config8(struct bcma_device *bdev, int busno,
+				  unsigned int devfn, int where)
+{
+	return bcma_pcie2_read_config(bdev, busno, devfn, where, 1);
+}
+
+static u16 bcma_pcie2_read_config16(struct bcma_device *bdev, int busno,
+				    unsigned int devfn, int where)
+{
+	return bcma_pcie2_read_config(bdev, busno, devfn, where, 2);
+}
+
+static u32 bcma_pcie2_read_config32(struct bcma_device *bdev, int busno,
+				    unsigned int devfn, int where)
+{
+	return bcma_pcie2_read_config(bdev, busno, devfn, where, 4);
+}
+
+static void bcma_pcie2_write_config8(struct bcma_device *bdev, int busno,
+				     unsigned int devfn, int where, u8 val)
+{
+	return bcma_pcie2_write_config(bdev, busno, devfn, where, 1, val);
+}
+
+static void bcma_pcie2_write_config16(struct bcma_device *bdev, int busno,
+				      unsigned int devfn, int where, u16 val)
+{
+	return bcma_pcie2_write_config(bdev, busno, devfn, where, 2, val);
+}
+
+static void bcma_pcie2_write_config32(struct bcma_device *bdev, int busno,
+				      unsigned int devfn, int where, u32 val)
+{
+	return bcma_pcie2_write_config(bdev, busno, devfn, where, 4, val);
+}
+
+static int bcma_pcie2_read_config_pci(struct pci_bus *bus, unsigned int devfn,
+				   int where, int size, u32 *val)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	struct bcma_device *bdev = sys->private_data;
+
+	*val = bcma_pcie2_read_config(bdev, bus->number, devfn, where, size);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int bcma_pcie2_write_config_pci(struct pci_bus *bus, unsigned int devfn,
+				    int where, int size, u32 val)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	struct bcma_device *bdev = sys->private_data;
+
+	bcma_pcie2_write_config(bdev, bus->number, devfn, where, size, val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * Check link status, return 0 if link is up in RC mode,
+ * otherwise return non-zero
+ */
+static int bcma_pcie2_check_link(struct bcma_device *bdev, u32 allow_gen2)
+{
+	u32 devfn = 0;
+	u8 tmp8;
+	u32 tmp32;
+
+	tmp32 = bcma_pcie2_read_config32(bdev, 0, devfn, 0xdc);
+	tmp32 &= ~0xf;
+	if (allow_gen2)
+		tmp32 |= 2;
+	else {
+		/* force PCIE GEN1 */
+		tmp32 |= 1;
+	}
+	bcma_pcie2_write_config32(bdev, 0, devfn, 0xdc, tmp32);
+
+	/* See if the port is in EP mode, indicated by header type 00 */
+	tmp8 = bcma_pcie2_read_config8(bdev, 0, devfn, PCI_HEADER_TYPE);
+	if (tmp8 != PCI_HEADER_TYPE_BRIDGE) {
+		dev_info(&bdev->dev, "Port %d in End-Point mode - ignored\n",
+			 bdev->core_unit);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Initializte the PCIe controller
+ */
+static void bcma_pcie2_hw_init(struct bcma_device *bdev)
+{
+	u32 devfn = 0;
+	u32 tmp32;
+	u16 tmp16;
+
+	/* Change MPS and MRRS to 512 */
+	tmp16 = bcma_pcie2_read_config16(bdev, 0, devfn, 0x4d4);
+	tmp16 &= ~7;
+	tmp16 |= 2;
+	bcma_pcie2_write_config16(bdev, 0, devfn, 0x4d4, tmp16);
+
+	tmp32 = bcma_pcie2_read_config32(bdev, 0, devfn, 0xb4);
+	tmp32 &= ~((7 << 12) | (7 << 5));
+	tmp32 |= (2 << 12) | (2 << 5);
+	bcma_pcie2_write_config32(bdev, 0, devfn, 0xb4, tmp32);
+
+	/* Turn-on Root-Complex (RC) mode, from reset defailt of EP */
+
+	/* The mode is set by straps, can be overwritten via DMU
+	   register <cru_straps_control> bit 5, "1" means RC
+	 */
+
+	/* Send a downstream reset */
+	bcma_write32(bdev, SOC_PCIE_CONTROL, 0x3);
+	udelay(250);
+	bcma_write32(bdev, SOC_PCIE_CONTROL, 0x1);
+	mdelay(250);
+
+	/* TBD: take care of PM, check we're on */
+}
+
+/*
+ * Setup the address translation
+ */
+static void bcma_pcie2_map_init(struct bcma_device *bdev)
+{
+	unsigned size, i;
+	u32 addr;
+
+	/*
+	 * NOTE:
+	 * All PCI-to-CPU address mapping are 1:1 for simplicity
+	 */
+
+	/* Outbound address translation setup */
+	size = SZ_128M;
+	addr = bdev->addr_s[0];
+	BUG_ON(!addr);
+	BUG_ON(addr & ((1 << 25) - 1));	/* 64MB alignment */
+
+	for (i = 0; i < 3; i++) {
+		const unsigned win_size = SZ_64M;
+		/* 64-bit LE regs, write low word, high is 0 at reset */
+		bcma_write32(bdev, SOC_PCIE_SYS_OMAP(i), addr);
+		bcma_write32(bdev, SOC_PCIE_SYS_OARR(i), addr|0x1);
+		addr += win_size;
+		if (size >= win_size)
+			size -= win_size;
+		if (size == 0)
+			break;
+	}
+	WARN_ON(size > 0);
+
+	/*
+	 * Inbound address translation setup
+	 * Northstar only maps up to 128 MiB inbound, DRAM could be up to 1 GiB.
+	 *
+	 * For now allow access to entire DRAM, assuming it is less than 128MiB,
+	 * otherwise DMA bouncing mechanism may be required.
+	 * Also consider DMA mask to limit DMA physical address
+	 */
+	size = SZ_128M;
+	addr = PHYS_OFFSET;
+
+	size >>= 20;	/* In MB */
+	size &= 0xff;	/* Size is an 8-bit field */
+
+	WARN_ON(size == 0);
+	/* 64-bit LE regs, write low word, high is 0 at reset */
+	bcma_write32(bdev, SOC_PCIE_SYS_IMAP1(0), addr | 0x1);
+	bcma_write32(bdev, SOC_PCIE_SYS_IARR(1), addr | size);
+
+#ifdef CONFIG_SPARSEMEM
+	addr = PHYS_OFFSET2;
+	bcma_write32(bdev, SOC_PCIE_SYS_IMAP2(0), addr | 0x1);
+	bcma_write32(bdev, SOC_PCIE_SYS_IARR(2), addr | size);
+#endif
+}
+
+/*
+ * Setup PCIE Host bridge
+ */
+static void bcma_pcie2_bridge_init(struct bcma_device *bdev)
+{
+	u32 devfn = 0;
+	u8 tmp8;
+	u16 tmp16;
+
+	bcma_pcie2_write_config8(bdev, 0, devfn, PCI_PRIMARY_BUS, 0);
+	bcma_pcie2_write_config8(bdev, 0, devfn, PCI_SECONDARY_BUS, 1);
+	bcma_pcie2_write_config8(bdev, 0, devfn, PCI_SUBORDINATE_BUS, 4);
+
+	tmp8 = bcma_pcie2_read_config8(bdev, 0, devfn, PCI_PRIMARY_BUS);
+	tmp8 = bcma_pcie2_read_config8(bdev, 0, devfn, PCI_SECONDARY_BUS);
+	tmp8 = bcma_pcie2_read_config8(bdev, 0, devfn, PCI_SUBORDINATE_BUS);
+
+	/* MEM_BASE, MEM_LIM require 1MB alignment */
+	BUG_ON((bdev->addr_s[0] >> 16) & 0xf);
+	bcma_pcie2_write_config16(bdev, 0, devfn, PCI_MEMORY_BASE,
+		bdev->addr_s[0] >> 16);
+	BUG_ON(((bdev->addr_s[0] + SZ_128M) >> 16) & 0xf);
+	bcma_pcie2_write_config16(bdev, 0, devfn, PCI_MEMORY_LIMIT,
+		(bdev->addr_s[0] + SZ_128M) >> 16);
+
+	/* These registers are not supported on the NS */
+	bcma_pcie2_write_config16(bdev, 0, devfn, PCI_IO_BASE_UPPER16, 0);
+	bcma_pcie2_write_config16(bdev, 0, devfn, PCI_IO_LIMIT_UPPER16, 0);
+
+	/* Force class to that of a Bridge */
+	bcma_pcie2_write_config16(bdev, 0, devfn, PCI_CLASS_DEVICE,
+				  PCI_CLASS_BRIDGE_PCI);
+
+	tmp16 = bcma_pcie2_read_config16(bdev, 0, devfn, PCI_CLASS_DEVICE);
+	tmp16 = bcma_pcie2_read_config16(bdev, 0, devfn, PCI_MEMORY_BASE);
+	tmp16 = bcma_pcie2_read_config16(bdev, 0, devfn, PCI_MEMORY_LIMIT);
+}
+
+static int bcma_pcie2_allow_gen2_rc(struct bcma_device *bdev)
+{
+	u32 vendorid, devid, chipid, chiprev;
+	u32 val, bar;
+	void __iomem *base;
+	int allow = 1;
+
+	/* Read PCI vendor/device ID's */
+	bcma_write32(bdev, SOC_PCIE_CFG_ADDR, 0x0);
+	val = bcma_read32(bdev, SOC_PCIE_CFG_DATA);
+	vendorid = val & 0xffff;
+	devid = val >> 16;
+	if (vendorid == PCI_VENDOR_ID_BROADCOM &&
+	    (devid == BCMA_CHIP_ID_BCM4360 || devid == BCM4360_D11AC_ID ||
+	     devid == BCM4360_D11AC2G_ID || devid == BCM4360_D11AC5G_ID ||
+	     devid == BCM4352_D11AC_ID || devid == BCM4352_D11AC2G_ID ||
+	     devid == BCM4352_D11AC5G_ID)) {
+		/* Config BAR0 */
+		bar = bdev->addr_s[0];
+		bcma_write32(bdev, SOC_PCIE_CFG_ADDR, 0x10);
+		bcma_write32(bdev, SOC_PCIE_CFG_DATA, bar);
+		/* Config BAR0 window to access chipc */
+		bcma_write32(bdev, SOC_PCIE_CFG_ADDR, 0x80);
+		bcma_write32(bdev, SOC_PCIE_CFG_DATA, SI_ENUM_BASE);
+
+		/* Enable memory resource */
+		bcma_write32(bdev, SOC_PCIE_CFG_ADDR, 0x4);
+		val = bcma_read32(bdev, SOC_PCIE_CFG_DATA);
+		val |= PCI_COMMAND_MEMORY;
+		bcma_write32(bdev, SOC_PCIE_CFG_DATA, val);
+		/* Enable memory and bus master */
+		bcma_write32(bdev, SOC_PCIE_HDR_OFF + 4, 0x6);
+
+		/* Read CHIP ID */
+		base = ioremap(bar, 0x1000);
+		val = __raw_readl(base);
+		iounmap(base);
+		chipid = val & 0xffff;
+		chiprev = (val >> 16) & 0xf;
+		if ((chipid == BCMA_CHIP_ID_BCM4360 ||
+		     chipid == BCMA_CHIP_ID_BCM43460 ||
+		     chipid == BCMA_CHIP_ID_BCM4352) && (chiprev < 3))
+			allow = 0;
+	}
+	return allow;
+}
+
+static void bcma_pcie2_3rd_init(struct bcma_bus *bus)
+{
+	/* PCIE PLL block register (base 0x8000) */
+	bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x00000088, 0x57fe8000);
+	/* Check PCIE PLL lock status */
+	bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x00000088, 0x67c60000);
+}
+
+/* To improve PCIE phy jitter */
+static void bcma_pcie2_improve_phy_jitter(struct bcma_bus *bus, int phyaddr)
+{
+	u32 val;
+
+	/* Change blkaddr */
+	val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x1f << 18) |
+		(2 << 16) | (0x863 << 4);
+	bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
+
+	/* Write 0x0190 to 0x13 regaddr */
+	val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x13 << 18) |
+		(2 << 16) | 0x0190;
+	bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
+
+	/* Write 0x0191 to 0x19 regaddr */
+	val = (1 << 30) | (1 << 28) | (phyaddr << 23) | (0x19 << 18) |
+		(2 << 16) | 0x0191;
+	bcma_chipco_b_mii_write(&bus->drv_cc_b, 0x0000009a, val);
+}
+
+static int bcma_pcie2_setup(int nr, struct pci_sys_data *sys)
+{
+	struct bcma_device *bdev = sys->private_data;
+	struct bcma_bus *bus = bdev->bus;
+	struct resource *res;
+	struct bcma_device *arm_core;
+	u32 cru_straps_ctrl;
+	int allow_gen2, linkfail;
+	int phyaddr;
+
+	if (bdev->core_unit == 2) {
+		arm_core = bcma_find_core(bus, BCMA_CORE_ARMCA9);
+		cru_straps_ctrl = bcma_read32(arm_core, 0x2a0);
+
+		/* 3rd PCIE is not selected */
+		if (cru_straps_ctrl & 0x10)
+			return -ENODEV;
+
+		bcma_pcie2_3rd_init(bus);
+		phyaddr = 0xf;
+	} else {
+		phyaddr = bdev->core_unit;
+	}
+	bcma_pcie2_improve_phy_jitter(bus, phyaddr);
+
+	/* create mem resource */
+	res = devm_kzalloc(&bdev->dev, sizeof(*res), GFP_KERNEL);
+	if (!res) {
+		dev_info(&bdev->dev, "requesting resource at 0x%x failed\n",
+			 bdev->addr_s[0]);
+		return -EINVAL;
+	}
+	res->start = bdev->addr_s[0];
+	res->end = res->start + SZ_128M - 1;
+	res->name = "PCIe Configuration Space";
+	res->flags = IORESOURCE_MEM;
+
+	pci_add_resource(&sys->resources, res);
+
+	/* This PCIe controller does not support IO Mem, so use a dummy one. */
+	res = devm_kzalloc(&bdev->dev, sizeof(*res), GFP_KERNEL);
+	if (!res) {
+		dev_info(&bdev->dev, "requesting resource at 0x%x failed\n",
+			 bdev->addr_s[0]);
+		return -EINVAL;
+	}
+	res->start = bdev->addr_s[0];
+	res->end = res->start + SZ_128M - 1;
+	res->name = "PCIe Configuration Space";
+	res->flags = IORESOURCE_IO;
+
+	pci_add_resource(&sys->resources, res);
+
+	for (allow_gen2 = 0; allow_gen2 <= 1; allow_gen2++) {
+		bcma_pcie2_hw_init(bdev);
+		bcma_pcie2_map_init(bdev);
+
+		/*
+		 * Skip inactive ports -
+		 * will need to change this for hot-plugging
+		 */
+		linkfail = bcma_pcie2_check_link(bdev, allow_gen2);
+		if (linkfail)
+			break;
+
+		bcma_pcie2_bridge_init(bdev);
+
+		if (allow_gen2 == 0) {
+			if (bcma_pcie2_allow_gen2_rc(bdev) == 0)
+				break;
+			dev_info(&bdev->dev, "switching to GEN2\n");
+		}
+	}
+
+	if (linkfail)
+		return -1;
+
+	return 1;
+}
+
+/*
+ * Methods for accessing configuration registers
+ */
+static struct pci_ops bcma_pcie2_ops = {
+	.read = bcma_pcie2_read_config_pci,
+	.write = bcma_pcie2_write_config_pci,
+};
+
+static int bcma_pcie2_probe(struct bcma_device *bdev)
+{
+	struct hw_pci hw;
+
+	dev_info(&bdev->dev, "scanning bus\n");
+
+	hw = (struct hw_pci) {
+		.nr_controllers = 1,
+		.domain		= bdev->core_unit,
+		.private_data	= (void **)&bdev,
+		.setup		= bcma_pcie2_setup,
+		.map_irq	= bcma_pcie2_map_irq,
+		.ops		= &bcma_pcie2_ops,
+	};
+
+	/* Announce this port to ARM/PCI common code */
+	pci_common_init_dev(&bdev->dev, &hw);
+
+	/* Setup virtual-wire interrupts */
+	bcma_write32(bdev, SOC_PCIE_SYS_RC_INTX_EN, 0xf);
+
+	/* Enable memory and bus master */
+	bcma_write32(bdev, SOC_PCIE_HDR_OFF + 4, 0x6);
+
+	return 0;
+}
+
+static const struct bcma_device_id bcma_pcie2_table[] = {
+	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_PCIEG2, BCMA_ANY_REV, BCMA_ANY_CLASS),
+	BCMA_CORETABLE_END
+};
+MODULE_DEVICE_TABLE(bcma, bcma_pcie2_table);
+
+static struct bcma_driver bcma_pcie2_driver = {
+	.name		= KBUILD_MODNAME,
+	.id_table	= bcma_pcie2_table,
+	.probe		= bcma_pcie2_probe,
+};
+
+static int __init bcma_pcie2_init(void)
+{
+	return bcma_driver_register(&bcma_pcie2_driver);
+}
+module_init(bcma_pcie2_init);
+
+static void __exit bcma_pcie2_exit(void)
+{
+	bcma_driver_unregister(&bcma_pcie2_driver);
+}
+module_exit(bcma_pcie2_exit);
+
+MODULE_AUTHOR("Hauke Mehrtens");
+MODULE_DESCRIPTION("PCIe Gen2 driver for BCMA");
+MODULE_LICENSE("GPLv2");