/*
 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
 * reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the NetLogic
 * license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/msi.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/console.h>
#include <linux/pci_regs.h>

#include <asm/io.h>

#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/haldefs.h>
#include <asm/netlogic/common.h>

#include <asm/netlogic/xlr/msidef.h>
#include <asm/netlogic/xlr/iomap.h>
#include <asm/netlogic/xlr/pic.h>
#include <asm/netlogic/xlr/xlr.h>

static void *pci_config_base;

#define pci_cfg_addr(bus, devfn, off) (((bus) << 16) | ((devfn) << 8) | (off))

/* PCI ops */
static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
	int where)
{
	u32 data;
	u32 *cfgaddr;

	cfgaddr = (u32 *)(pci_config_base +
			pci_cfg_addr(bus->number, devfn, where & ~3));
	data = *cfgaddr;
	return cpu_to_le32(data);
}

static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
	int where, u32 data)
{
	u32 *cfgaddr;

	cfgaddr = (u32 *)(pci_config_base +
			pci_cfg_addr(bus->number, devfn, where & ~3));
	*cfgaddr = cpu_to_le32(data);
}

static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 *val)
{
	u32 data;

	if ((size == 2) && (where & 1))
		return PCIBIOS_BAD_REGISTER_NUMBER;
	else if ((size == 4) && (where & 3))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	data = pci_cfg_read_32bit(bus, devfn, where);

	if (size == 1)
		*val = (data >> ((where & 3) << 3)) & 0xff;
	else if (size == 2)
		*val = (data >> ((where & 3) << 3)) & 0xffff;
	else
		*val = data;

	return PCIBIOS_SUCCESSFUL;
}


static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
		int where, int size, u32 val)
{
	u32 data;

	if ((size == 2) && (where & 1))
		return PCIBIOS_BAD_REGISTER_NUMBER;
	else if ((size == 4) && (where & 3))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	data = pci_cfg_read_32bit(bus, devfn, where);

	if (size == 1)
		data = (data & ~(0xff << ((where & 3) << 3))) |
			(val << ((where & 3) << 3));
	else if (size == 2)
		data = (data & ~(0xffff << ((where & 3) << 3))) |
			(val << ((where & 3) << 3));
	else
		data = val;

	pci_cfg_write_32bit(bus, devfn, where, data);

	return PCIBIOS_SUCCESSFUL;
}

struct pci_ops nlm_pci_ops = {
	.read  = nlm_pcibios_read,
	.write = nlm_pcibios_write
};

static struct resource nlm_pci_mem_resource = {
	.name		= "XLR PCI MEM",
	.start		= 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
	.end		= 0xdfffffffUL,
	.flags		= IORESOURCE_MEM,
};

static struct resource nlm_pci_io_resource = {
	.name		= "XLR IO MEM",
	.start		= 0x10000000UL, /* 16MB PCI IO @ 0x1000_0000 */
	.end		= 0x100fffffUL,
	.flags		= IORESOURCE_IO,
};

struct pci_controller nlm_pci_controller = {
	.index		= 0,
	.pci_ops	= &nlm_pci_ops,
	.mem_resource	= &nlm_pci_mem_resource,
	.mem_offset	= 0x00000000UL,
	.io_resource	= &nlm_pci_io_resource,
	.io_offset	= 0x00000000UL,
};

/*
 * The top level PCIe links on the XLS PCIe controller appear as
 * bridges. Given a device, this function finds which link it is
 * on.
 */
static struct pci_dev *xls_get_pcie_link(const struct pci_dev *dev)
{
	struct pci_bus *bus, *p;

	/* Find the bridge on bus 0 */
	bus = dev->bus;
	for (p = bus->parent; p && p->number != 0; p = p->parent)
		bus = p;

	return p ? bus->self : NULL;
}

static int nlm_pci_link_to_irq(int link)
{
	switch	(link) {
	case 0:
		return PIC_PCIE_LINK0_IRQ;
	case 1:
		return PIC_PCIE_LINK1_IRQ;
	case 2:
		if (nlm_chip_is_xls_b())
			return PIC_PCIE_XLSB0_LINK2_IRQ;
		else
			return PIC_PCIE_LINK2_IRQ;
	case 3:
		if (nlm_chip_is_xls_b())
			return PIC_PCIE_XLSB0_LINK3_IRQ;
		else
			return PIC_PCIE_LINK3_IRQ;
	}
	WARN(1, "Unexpected link %d\n", link);
	return 0;
}

static int get_irq_vector(const struct pci_dev *dev)
{
	struct pci_dev *lnk;
	int link;

	if (!nlm_chip_is_xls())
		return	PIC_PCIX_IRQ;	/* for XLR just one IRQ */

	lnk = xls_get_pcie_link(dev);
	if (lnk == NULL)
		return 0;

	link = PCI_SLOT(lnk->devfn);
	return nlm_pci_link_to_irq(link);
}

#ifdef CONFIG_PCI_MSI
void arch_teardown_msi_irq(unsigned int irq)
{
}

int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
	struct msi_msg msg;
	struct pci_dev *lnk;
	int irq, ret;
	u16 val;

	/* MSI not supported on XLR */
	if (!nlm_chip_is_xls())
		return 1;

	/*
	 * Enable MSI on the XLS PCIe controller bridge which was disabled
	 * at enumeration, the bridge MSI capability is at 0x50
	 */
	lnk = xls_get_pcie_link(dev);
	if (lnk == NULL)
		return 1;

	pci_read_config_word(lnk, 0x50 + PCI_MSI_FLAGS, &val);
	if ((val & PCI_MSI_FLAGS_ENABLE) == 0) {
		val |= PCI_MSI_FLAGS_ENABLE;
		pci_write_config_word(lnk, 0x50 + PCI_MSI_FLAGS, val);
	}

	irq = get_irq_vector(dev);
	if (irq <= 0)
		return 1;

	msg.address_hi = MSI_ADDR_BASE_HI;
	msg.address_lo = MSI_ADDR_BASE_LO   |
		MSI_ADDR_DEST_MODE_PHYSICAL |
		MSI_ADDR_REDIRECTION_CPU;

	msg.data = MSI_DATA_TRIGGER_EDGE |
		MSI_DATA_LEVEL_ASSERT	 |
		MSI_DATA_DELIVERY_FIXED;

	ret = irq_set_msi_desc(irq, desc);
	if (ret < 0)
		return ret;

	pci_write_msi_msg(irq, &msg);
	return 0;
}
#endif

/* Extra ACK needed for XLR on chip PCI controller */
static void xlr_pci_ack(struct irq_data *d)
{
	uint64_t pcibase = nlm_mmio_base(NETLOGIC_IO_PCIX_OFFSET);

	nlm_read_reg(pcibase, (0x140 >> 2));
}

/* Extra ACK needed for XLS on chip PCIe controller */
static void xls_pcie_ack(struct irq_data *d)
{
	uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);

	switch (d->irq) {
	case PIC_PCIE_LINK0_IRQ:
		nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_LINK1_IRQ:
		nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_LINK2_IRQ:
		nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_LINK3_IRQ:
		nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
		break;
	}
}

/* For XLS B silicon, the 3,4 PCI interrupts are different */
static void xls_pcie_ack_b(struct irq_data *d)
{
	uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);

	switch (d->irq) {
	case PIC_PCIE_LINK0_IRQ:
		nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_LINK1_IRQ:
		nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_XLSB0_LINK2_IRQ:
		nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
		break;
	case PIC_PCIE_XLSB0_LINK3_IRQ:
		nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
		break;
	}
}

int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	return get_irq_vector(dev);
}

/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
	return 0;
}

static int __init pcibios_init(void)
{
	void (*extra_ack)(struct irq_data *);
	int link, irq;

	/* PSB assigns PCI resources */
	pci_set_flags(PCI_PROBE_ONLY);
	pci_config_base = ioremap(DEFAULT_PCI_CONFIG_BASE, 16 << 20);

	/* Extend IO port for memory mapped io */
	ioport_resource.start =	 0;
	ioport_resource.end   = ~0;

	set_io_port_base(CKSEG1);
	nlm_pci_controller.io_map_base = CKSEG1;

	pr_info("Registering XLR/XLS PCIX/PCIE Controller.\n");
	register_pci_controller(&nlm_pci_controller);

	/*
	 * For PCI interrupts, we need to ack the PCI controller too, overload
	 * irq handler data to do this
	 */
	if (!nlm_chip_is_xls()) {
		/* XLR PCI controller ACK */
		nlm_set_pic_extra_ack(0, PIC_PCIX_IRQ, xlr_pci_ack);
	} else {
		if  (nlm_chip_is_xls_b())
			extra_ack = xls_pcie_ack_b;
		else
			extra_ack = xls_pcie_ack;
		for (link = 0; link < 4; link++) {
			irq = nlm_pci_link_to_irq(link);
			nlm_set_pic_extra_ack(0, irq, extra_ack);
		}
	}
	return 0;
}

arch_initcall(pcibios_init);
