diff mbox

[v11,3/6] pci:host: Add Altera PCIe host controller driver

Message ID 1445506051-21688-4-git-send-email-lftan@altera.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Ley Foon Tan Oct. 22, 2015, 9:27 a.m. UTC
This patch adds the Altera PCIe host controller driver.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
---
 drivers/pci/host/Kconfig       |   8 +
 drivers/pci/host/Makefile      |   1 +
 drivers/pci/host/pcie-altera.c | 579 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 588 insertions(+)
 create mode 100644 drivers/pci/host/pcie-altera.c

Comments

Bjorn Helgaas Oct. 23, 2015, 5:31 a.m. UTC | #1
Hi Ley,

On Thu, Oct 22, 2015 at 05:27:28PM +0800, Ley Foon Tan wrote:
> This patch adds the Altera PCIe host controller driver.

> +static void altera_pcie_fixups(struct pci_bus *bus)
> +{
> +	struct pci_dev *dev;
> +
> +	list_for_each_entry(dev, &bus->devices, bus_list) {
> +		altera_pcie_retrain(dev);
> +		altera_pcie_fixup_res(dev);
> +	}
> +}

I'd really like to avoid this particular fixup because it's done
between pci_scan_root_bus() and pci_assign_unassigned_bus_resources()
and pci_bus_add_devices().  That path is almost 100% arch-independent,
and someday we should be able to pull all that out into one PCI core
interface.

You might be able to do the link retrain fixup as a header quirk.
That's not really ideal either, but I don't think we have a good
mechanism of inserting per-host bridge hooks in the enumeration path.
There are some pcibios_*() hooks, but those are per-arch, not per-host
bridge, so they're not really what you want here.

I think other host drivers have handled the "prevent enumeration of
root complex resources" problem by adding a similar check in the
config accessors.

> +static int altera_pcie_cfg_write(struct pci_bus *bus, unsigned int devfn,
> +				 int where, int size, u32 value)

This needs a comment to the effect that this hardware can only generate
32-bit config accesses.  We also need a printk in the probe routine so
there's a note in dmesg so we have a clue that RW1C bits in config space
may be corrupted.

> +{
> +	struct altera_pcie *pcie = bus->sysdata;
> +	u32 data32;
> +	u32 shift = 8 * (where & 3);
> +	u8 byte_en;
> +
> +	if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn)))
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	switch (size) {
> +	case 1:
> +		data32 = (value & 0xff) << shift;
> +		byte_en = 1 << (where & 3);
> +		break;
> +	case 2:
> +		data32 = (value & 0xffff) << shift;
> +		byte_en = 3 << (where & 3);
> +		break;
> +	default:
> +		data32 = value;
> +		byte_en = 0xf;
> +		break;
> +	}
> +
> +	return tlp_cfg_dword_write(pcie, bus->number, devfn,
> +		(where & ~DWORD_MASK), byte_en, data32);
> +}

> +static void altera_pcie_isr(struct irq_desc *desc)
> +{
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	struct altera_pcie *pcie;
> +	unsigned long status;
> +	u32 bit;
> +	u32 virq;
> +
> +	chained_irq_enter(chip, desc);
> +	pcie = irq_desc_get_handler_data(desc);
> +
> +	while ((status = cra_readl(pcie, P2A_INT_STATUS)
> +		& P2A_INT_STS_ALL) != 0) {
> +		for_each_set_bit(bit, &status, INTX_NUM) {
> +			/* clear interrupts */
> +			cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
> +
> +			virq = irq_find_mapping(pcie->irq_domain, bit + 1);
> +			if (virq)
> +				generic_handle_irq(virq);
> +			else
> +				dev_err(&pcie->pdev->dev, "unexpected IRQ\n");

Include the bit number here.  A printk string with no % substitutions
is rarely as useful as it could be.

> ...
> +	bus = pci_scan_root_bus(&pdev->dev, pcie->root_bus_nr, &altera_pcie_ops,
> +				pcie, &pcie->resources);
> +	if (!bus)
> +		return -ENOMEM;
> +
> +	altera_pcie_fixups(bus);
> +	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
> +	pci_assign_unassigned_bus_resources(bus);
> +	pci_bus_add_devices(bus);
> +
> +	/* Configure PCI Express setting. */
> +	list_for_each_entry(child, &bus->children, node)
> +		pcie_bus_configure_settings(child);

This loop should be before pci_bus_add_devices().  When we call
pci_bus_add_devices(), drivers may claim devices immediately, and the
PCI core shouldn't be changing device configuration while a driver
owns the device.

Bjorn
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Ley Foon Tan Oct. 23, 2015, 6:24 a.m. UTC | #2
On Fri, Oct 23, 2015 at 1:31 PM, Bjorn Helgaas <helgaas@kernel.org> wrote:
> Hi Ley,
>
> On Thu, Oct 22, 2015 at 05:27:28PM +0800, Ley Foon Tan wrote:
>> This patch adds the Altera PCIe host controller driver.
>
>> +static void altera_pcie_fixups(struct pci_bus *bus)
>> +{
>> +     struct pci_dev *dev;
>> +
>> +     list_for_each_entry(dev, &bus->devices, bus_list) {
>> +             altera_pcie_retrain(dev);
>> +             altera_pcie_fixup_res(dev);
>> +     }
>> +}
>
> I'd really like to avoid this particular fixup because it's done
> between pci_scan_root_bus() and pci_assign_unassigned_bus_resources()
> and pci_bus_add_devices().  That path is almost 100% arch-independent,
> and someday we should be able to pull all that out into one PCI core
> interface.
>
> You might be able to do the link retrain fixup as a header quirk.
> That's not really ideal either, but I don't think we have a good
> mechanism of inserting per-host bridge hooks in the enumeration path.
> There are some pcibios_*() hooks, but those are per-arch, not per-host
> bridge, so they're not really what you want here.
Okay, will change the retrain fixup to use *PCI_FIXUP* macro.
By doing this, we need [PATCH v11 2/6] pci: add Altera PCI vendor ID patch.

>
> I think other host drivers have handled the "prevent enumeration of
> root complex resources" problem by adding a similar check in the
> config accessors.
Okay, will handle this in config accessors.

>
>> +static int altera_pcie_cfg_write(struct pci_bus *bus, unsigned int devfn,
>> +                              int where, int size, u32 value)
>
> This needs a comment to the effect that this hardware can only generate
> 32-bit config accesses.  We also need a printk in the probe routine so
> there's a note in dmesg so we have a clue that RW1C bits in config space
> may be corrupted.
I have checked the PCIe/TLP spec, we can use the "First BE" (byte
enable) field in TLP packet to write
specific bytes only. And I have update driver to support this "First
BE" feature.
So, we don't have corrupted RW1C bit issue now.

>
>> +{
>> +     struct altera_pcie *pcie = bus->sysdata;
>> +     u32 data32;
>> +     u32 shift = 8 * (where & 3);
>> +     u8 byte_en;
>> +
>> +     if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn)))
>> +             return PCIBIOS_DEVICE_NOT_FOUND;
>> +
>> +     switch (size) {
>> +     case 1:
>> +             data32 = (value & 0xff) << shift;
>> +             byte_en = 1 << (where & 3);
>> +             break;
>> +     case 2:
>> +             data32 = (value & 0xffff) << shift;
>> +             byte_en = 3 << (where & 3);
>> +             break;
>> +     default:
>> +             data32 = value;
>> +             byte_en = 0xf;
>> +             break;
>> +     }
>> +
>> +     return tlp_cfg_dword_write(pcie, bus->number, devfn,
>> +             (where & ~DWORD_MASK), byte_en, data32);
>> +}
>
>> +static void altera_pcie_isr(struct irq_desc *desc)
>> +{
>> +     struct irq_chip *chip = irq_desc_get_chip(desc);
>> +     struct altera_pcie *pcie;
>> +     unsigned long status;
>> +     u32 bit;
>> +     u32 virq;
>> +
>> +     chained_irq_enter(chip, desc);
>> +     pcie = irq_desc_get_handler_data(desc);
>> +
>> +     while ((status = cra_readl(pcie, P2A_INT_STATUS)
>> +             & P2A_INT_STS_ALL) != 0) {
>> +             for_each_set_bit(bit, &status, INTX_NUM) {
>> +                     /* clear interrupts */
>> +                     cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
>> +
>> +                     virq = irq_find_mapping(pcie->irq_domain, bit + 1);
>> +                     if (virq)
>> +                             generic_handle_irq(virq);
>> +                     else
>> +                             dev_err(&pcie->pdev->dev, "unexpected IRQ\n");
>
> Include the bit number here.  A printk string with no % substitutions
> is rarely as useful as it could be.
Okay.
>
>> ...
>> +     bus = pci_scan_root_bus(&pdev->dev, pcie->root_bus_nr, &altera_pcie_ops,
>> +                             pcie, &pcie->resources);
>> +     if (!bus)
>> +             return -ENOMEM;
>> +
>> +     altera_pcie_fixups(bus);
>> +     pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
>> +     pci_assign_unassigned_bus_resources(bus);
>> +     pci_bus_add_devices(bus);
>> +
>> +     /* Configure PCI Express setting. */
>> +     list_for_each_entry(child, &bus->children, node)
>> +             pcie_bus_configure_settings(child);
>
> This loop should be before pci_bus_add_devices().  When we call
> pci_bus_add_devices(), drivers may claim devices immediately, and the
> PCI core shouldn't be changing device configuration while a driver
> owns the device.
Okay, will move this before pci_bus_add_devices().

Thanks.

Regards
Ley Foon
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diff mbox

Patch

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index d5e58ba..a67c9de 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -145,4 +145,12 @@  config PCIE_IPROC_BCMA
 	  Say Y here if you want to use the Broadcom iProc PCIe controller
 	  through the BCMA bus interface
 
+config PCIE_ALTERA
+	tristate "Altera PCIe controller"
+	depends on ARM || NIOS2
+	select PCI_DOMAINS
+	help
+	  Say Y here if you want to enable PCIe controller support on Altera
+	  FPGA.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 140d66f..6954f76 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -17,3 +17,4 @@  obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
 obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
 obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
 obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
+obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
new file mode 100644
index 0000000..3503d9c
--- /dev/null
+++ b/drivers/pci/host/pcie-altera.c
@@ -0,0 +1,579 @@ 
+/*
+ * Copyright Altera Corporation (C) 2013-2015. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define RP_TX_REG0			0x2000
+#define RP_TX_REG1			0x2004
+#define RP_TX_CNTRL			0x2008
+#define RP_TX_EOP			0x2
+#define RP_TX_SOP			0x1
+#define RP_RXCPL_STATUS			0x2010
+#define RP_RXCPL_EOP			0x2
+#define RP_RXCPL_SOP			0x1
+#define RP_RXCPL_REG0			0x2014
+#define RP_RXCPL_REG1			0x2018
+#define P2A_INT_STATUS			0x3060
+#define P2A_INT_STS_ALL			0xf
+#define P2A_INT_ENABLE			0x3070
+#define P2A_INT_ENA_ALL			0xf
+#define RP_LTSSM			0x3c64
+#define LTSSM_L0			0xf
+
+/* TLP configuration type 0 and 1 */
+#define TLP_FMTTYPE_CFGRD0		0x04	/* Configuration Read Type 0 */
+#define TLP_FMTTYPE_CFGWR0		0x44	/* Configuration Write Type 0 */
+#define TLP_FMTTYPE_CFGRD1		0x05	/* Configuration Read Type 1 */
+#define TLP_FMTTYPE_CFGWR1		0x45	/* Configuration Write Type 1 */
+#define TLP_PAYLOAD_SIZE		0x01
+#define TLP_READ_TAG			0x1d
+#define TLP_WRITE_TAG			0x10
+#define TLP_CFG_DW0(fmttype)		(((fmttype) << 24) | TLP_PAYLOAD_SIZE)
+#define TLP_CFG_DW1(reqid, tag, be)	(((reqid) << 16) | (tag << 8) | (be))
+#define TLP_CFG_DW2(bus, devfn, offset)	\
+				(((bus) << 24) | ((devfn) << 16) | (offset))
+#define TLP_REQ_ID(bus, devfn)		(((bus) << 8) | (devfn))
+#define TLP_HDR_SIZE			3
+#define TLP_LOOP			500
+
+#define INTX_NUM			4
+
+#define DWORD_MASK			3
+
+struct altera_pcie {
+	struct platform_device	*pdev;
+	void __iomem		*cra_base;
+	int			irq;
+	u8			root_bus_nr;
+	struct irq_domain		*irq_domain;
+	struct resource		bus_range;
+	struct list_head		resources;
+};
+
+struct tlp_rp_regpair_t {
+	u32 ctrl;
+	u32 reg0;
+	u32 reg1;
+};
+
+static void altera_pcie_retrain(struct pci_dev *dev)
+{
+	u16 linkcap, linkstat;
+
+	/*
+	 * Set the retrain bit if the PCIe rootport support > 2.5GB/s, but
+	 * current speed is 2.5 GB/s.
+	 */
+	pcie_capability_read_word(dev, PCI_EXP_LNKCAP, &linkcap);
+
+	if ((linkcap & PCI_EXP_LNKCAP_SLS) <= PCI_EXP_LNKCAP_SLS_2_5GB)
+		return;
+
+	pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &linkstat);
+	if ((linkstat & PCI_EXP_LNKSTA_CLS) == PCI_EXP_LNKSTA_CLS_2_5GB)
+		pcie_capability_set_word(dev, PCI_EXP_LNKCTL,
+					 PCI_EXP_LNKCTL_RL);
+}
+
+static void altera_pcie_fixup_res(struct pci_dev *dev)
+{
+	/*
+	 * Prevent enumeration of root complex resources.
+	 */
+	if (pci_is_root_bus(dev->bus) && dev->devfn == 0) {
+		int i;
+
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			dev->resource[i].start = 0;
+			dev->resource[i].end = 0;
+			dev->resource[i].flags = 0;
+		}
+	}
+}
+
+static void altera_pcie_fixups(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		altera_pcie_retrain(dev);
+		altera_pcie_fixup_res(dev);
+	}
+}
+
+static inline void cra_writel(struct altera_pcie *pcie, const u32 value,
+			      const u32 reg)
+{
+	writel_relaxed(value, pcie->cra_base + reg);
+}
+
+static inline u32 cra_readl(struct altera_pcie *pcie, const u32 reg)
+{
+	return readl_relaxed(pcie->cra_base + reg);
+}
+
+static void tlp_write_tx(struct altera_pcie *pcie,
+			 struct tlp_rp_regpair_t *tlp_rp_regdata)
+{
+	cra_writel(pcie, tlp_rp_regdata->reg0, RP_TX_REG0);
+	cra_writel(pcie, tlp_rp_regdata->reg1, RP_TX_REG1);
+	cra_writel(pcie, tlp_rp_regdata->ctrl, RP_TX_CNTRL);
+}
+
+static bool altera_pcie_link_is_up(struct altera_pcie *pcie)
+{
+	return !!(cra_readl(pcie, RP_LTSSM) & LTSSM_L0);
+}
+
+static bool altera_pcie_valid_config(struct altera_pcie *pcie,
+				     struct pci_bus *bus, int dev)
+{
+	/* If there is no link, then there is no device */
+	if (bus->number != pcie->root_bus_nr) {
+		if (!altera_pcie_link_is_up(pcie))
+			return false;
+	}
+
+	/* access only one slot on each root port */
+	if (bus->number == pcie->root_bus_nr && dev > 0)
+		return false;
+
+	/*
+	 * Do not read more than one device on the bus directly attached
+	 * to root port, root port can only attach to one downstream port.
+	 */
+	if (bus->primary == pcie->root_bus_nr && dev > 0)
+		return false;
+
+	 return true;
+}
+
+static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
+{
+	u8 loop;
+	bool sop = 0;
+	u32 ctrl;
+	u32 reg0, reg1;
+
+	/*
+	 * Minimum 2 loops to read TLP headers and 1 loop to read data
+	 * payload.
+	 */
+	for (loop = 0; loop < TLP_LOOP; loop++) {
+		ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
+		if ((ctrl & RP_RXCPL_SOP) || (ctrl & RP_RXCPL_EOP) || sop) {
+			reg0 = cra_readl(pcie, RP_RXCPL_REG0);
+			reg1 = cra_readl(pcie, RP_RXCPL_REG1);
+
+			if (ctrl & RP_RXCPL_SOP)
+				sop = true;
+
+			if (ctrl & RP_RXCPL_EOP) {
+				if (value)
+					*value = reg0;
+				return PCIBIOS_SUCCESSFUL;
+			}
+		}
+		udelay(5);
+	}
+
+	return -ENOENT;
+}
+
+static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
+			     u32 data, bool align)
+{
+	struct tlp_rp_regpair_t tlp_rp_regdata;
+
+	tlp_rp_regdata.reg0 = headers[0];
+	tlp_rp_regdata.reg1 = headers[1];
+	tlp_rp_regdata.ctrl = RP_TX_SOP;
+	tlp_write_tx(pcie, &tlp_rp_regdata);
+
+	if (align) {
+		tlp_rp_regdata.reg0 = headers[2];
+		tlp_rp_regdata.reg1 = 0;
+		tlp_rp_regdata.ctrl = 0;
+		tlp_write_tx(pcie, &tlp_rp_regdata);
+
+		tlp_rp_regdata.reg0 = data;
+		tlp_rp_regdata.reg1 = 0;
+	} else {
+		tlp_rp_regdata.reg0 = headers[2];
+		tlp_rp_regdata.reg1 = data;
+	}
+
+	tlp_rp_regdata.ctrl = RP_TX_EOP;
+	tlp_write_tx(pcie, &tlp_rp_regdata);
+}
+
+static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
+			      int where, u8 byte_en, u32 *value)
+{
+	u32 headers[TLP_HDR_SIZE];
+
+	if (bus == pcie->root_bus_nr)
+		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD0);
+	else
+		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD1);
+
+	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+					TLP_READ_TAG, byte_en);
+	headers[2] = TLP_CFG_DW2(bus, devfn, where);
+
+	tlp_write_packet(pcie, headers, 0, false);
+
+	return tlp_read_packet(pcie, value);
+}
+
+static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
+			       int where, u8 byte_en, u32 value)
+{
+	u32 headers[TLP_HDR_SIZE];
+	int ret;
+
+	if (bus == pcie->root_bus_nr)
+		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR0);
+	else
+		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR1);
+
+	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+					TLP_WRITE_TAG, byte_en);
+	headers[2] = TLP_CFG_DW2(bus, devfn, where);
+
+	/* check alignment to Qword */
+	if ((where & 0x7) == 0)
+		tlp_write_packet(pcie, headers, value, true);
+	else
+		tlp_write_packet(pcie, headers, value, false);
+
+	ret = tlp_read_packet(pcie, NULL);
+	if (ret != PCIBIOS_SUCCESSFUL)
+		return ret;
+
+	/*
+	 * Monitoring changes to PCI_PRIMARY_BUS register on root port
+	 * and update local copy of root bus number accordingly.
+	 */
+	if ((bus == pcie->root_bus_nr) && (where == PCI_PRIMARY_BUS))
+		pcie->root_bus_nr = (u8)(value);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn,
+				int where, int size, u32 *value)
+{
+	struct altera_pcie *pcie = bus->sysdata;
+	int ret;
+	u32 data;
+	u8 byte_en;
+
+	if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn))) {
+		*value = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	switch (size) {
+	case 1:
+		byte_en = 1 << (where & 3);
+		break;
+	case 2:
+		byte_en = 3 << (where & 3);
+		break;
+	default:
+		byte_en = 0xf;
+		break;
+	}
+
+	ret = tlp_cfg_dword_read(pcie, bus->number, devfn,
+				 (where & ~DWORD_MASK), byte_en, &data);
+	if (ret != PCIBIOS_SUCCESSFUL)
+		return ret;
+
+	switch (size) {
+	case 1:
+		*value = (data >> (8 * (where & 0x3))) & 0xff;
+		break;
+	case 2:
+		*value = (data >> (8 * (where & 0x2))) & 0xffff;
+		break;
+	default:
+		*value = data;
+		break;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int altera_pcie_cfg_write(struct pci_bus *bus, unsigned int devfn,
+				 int where, int size, u32 value)
+{
+	struct altera_pcie *pcie = bus->sysdata;
+	u32 data32;
+	u32 shift = 8 * (where & 3);
+	u8 byte_en;
+
+	if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn)))
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	switch (size) {
+	case 1:
+		data32 = (value & 0xff) << shift;
+		byte_en = 1 << (where & 3);
+		break;
+	case 2:
+		data32 = (value & 0xffff) << shift;
+		byte_en = 3 << (where & 3);
+		break;
+	default:
+		data32 = value;
+		byte_en = 0xf;
+		break;
+	}
+
+	return tlp_cfg_dword_write(pcie, bus->number, devfn,
+		(where & ~DWORD_MASK), byte_en, data32);
+}
+
+static struct pci_ops altera_pcie_ops = {
+	.read = altera_pcie_cfg_read,
+	.write = altera_pcie_cfg_write,
+};
+
+static int altera_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+				irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+	.map = altera_pcie_intx_map,
+};
+
+static void altera_pcie_isr(struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct altera_pcie *pcie;
+	unsigned long status;
+	u32 bit;
+	u32 virq;
+
+	chained_irq_enter(chip, desc);
+	pcie = irq_desc_get_handler_data(desc);
+
+	while ((status = cra_readl(pcie, P2A_INT_STATUS)
+		& P2A_INT_STS_ALL) != 0) {
+		for_each_set_bit(bit, &status, INTX_NUM) {
+			/* clear interrupts */
+			cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
+
+			virq = irq_find_mapping(pcie->irq_domain, bit + 1);
+			if (virq)
+				generic_handle_irq(virq);
+			else
+				dev_err(&pcie->pdev->dev, "unexpected IRQ\n");
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void altera_pcie_release_of_pci_ranges(struct altera_pcie *pcie)
+{
+	pci_free_resource_list(&pcie->resources);
+}
+
+static int altera_pcie_parse_request_of_pci_ranges(struct altera_pcie *pcie)
+{
+	int err, res_valid = 0;
+	struct device *dev = &pcie->pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct resource_entry *win;
+
+	err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pcie->resources,
+					       NULL);
+	if (err)
+		return err;
+
+	resource_list_for_each_entry(win, &pcie->resources) {
+		struct resource *parent, *res = win->res;
+
+		switch (resource_type(res)) {
+		case IORESOURCE_MEM:
+			parent = &iomem_resource;
+			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
+			break;
+		default:
+			continue;
+		}
+
+		err = devm_request_resource(dev, parent, res);
+		if (err)
+			goto out_release_res;
+	}
+
+	if (!res_valid) {
+		dev_err(dev, "non-prefetchable memory resource required\n");
+		err = -EINVAL;
+		goto out_release_res;
+	}
+
+	return 0;
+
+out_release_res:
+	altera_pcie_release_of_pci_ranges(pcie);
+	return err;
+}
+
+static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
+{
+	struct device *dev = &pcie->pdev->dev;
+	struct device_node *node = dev->of_node;
+
+	/* Setup INTx */
+	pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM,
+					&intx_domain_ops, pcie);
+	if (!pcie->irq_domain) {
+		dev_err(dev, "Failed to get a INTx IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int altera_pcie_parse_dt(struct altera_pcie *pcie)
+{
+	struct resource *cra;
+	struct platform_device *pdev = pcie->pdev;
+
+	cra = platform_get_resource_byname(pdev, IORESOURCE_MEM, "Cra");
+	if (!cra) {
+		dev_err(&pdev->dev,
+			"no Cra memory resource defined\n");
+		return -ENODEV;
+	}
+
+	pcie->cra_base = devm_ioremap_resource(&pdev->dev, cra);
+	if (IS_ERR(pcie->cra_base)) {
+		dev_err(&pdev->dev, "failed to map cra memory\n");
+		return PTR_ERR(pcie->cra_base);
+	}
+
+	/* setup IRQ */
+	pcie->irq = platform_get_irq(pdev, 0);
+	if (pcie->irq <= 0) {
+		dev_err(&pdev->dev, "failed to get IRQ: %d\n", pcie->irq);
+		return -EINVAL;
+	}
+
+	irq_set_chained_handler_and_data(pcie->irq, altera_pcie_isr, pcie);
+
+	return 0;
+}
+
+static int altera_pcie_probe(struct platform_device *pdev)
+{
+	struct altera_pcie *pcie;
+	struct pci_bus *bus;
+	struct pci_bus *child;
+	int ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->pdev = pdev;
+
+	ret = altera_pcie_parse_dt(pcie);
+	if (ret) {
+		dev_err(&pdev->dev, "Parsing DT failed\n");
+		return ret;
+	}
+
+	INIT_LIST_HEAD(&pcie->resources);
+
+	ret = altera_pcie_parse_request_of_pci_ranges(pcie);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed add resources\n");
+		return ret;
+	}
+
+	ret = altera_pcie_init_irq_domain(pcie);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed creating IRQ Domain\n");
+		return ret;
+	}
+
+	/* clear all interrupts */
+	cra_writel(pcie, P2A_INT_STS_ALL, P2A_INT_STATUS);
+	/* enable all interrupts */
+	cra_writel(pcie, P2A_INT_ENA_ALL, P2A_INT_ENABLE);
+
+	bus = pci_scan_root_bus(&pdev->dev, pcie->root_bus_nr, &altera_pcie_ops,
+				pcie, &pcie->resources);
+	if (!bus)
+		return -ENOMEM;
+
+	altera_pcie_fixups(bus);
+	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
+	pci_assign_unassigned_bus_resources(bus);
+	pci_bus_add_devices(bus);
+
+	/* Configure PCI Express setting. */
+	list_for_each_entry(child, &bus->children, node)
+		pcie_bus_configure_settings(child);
+
+	platform_set_drvdata(pdev, pcie);
+	return ret;
+}
+
+static const struct of_device_id altera_pcie_of_match[] = {
+	{ .compatible = "altr,pcie-root-port-1.0", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, altera_pcie_of_match);
+
+static struct platform_driver altera_pcie_driver = {
+	.probe		= altera_pcie_probe,
+	.driver = {
+		.name	= "altera-pcie",
+		.of_match_table = altera_pcie_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+
+static int altera_pcie_init(void)
+{
+	return platform_driver_register(&altera_pcie_driver);
+}
+
+module_init(altera_pcie_init);
+
+MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
+MODULE_DESCRIPTION("Altera PCIe host controller driver");
+MODULE_LICENSE("GPL v2");