linux_dsm_epyc7002/arch/mips/pci/pci-xlr.c

/*
 * 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/mm.h>
#include <linux/console.h>

#include <asm/io.h>

#include <asm/netlogic/interrupt.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,
};

int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	if (!nlm_chip_is_xls())
		return	PIC_PCIX_IRQ;	/* for XLR just one IRQ*/

	/*
	 * For XLS PCIe, there is an IRQ per Link, find out which
	 * link the device is on to assign interrupts
	*/
	if (dev->bus->self == NULL)
		return 0;

	switch	(dev->bus->self->devfn) {
	case 0x0:
		return PIC_PCIE_LINK0_IRQ;
	case 0x8:
		return PIC_PCIE_LINK1_IRQ;
	case 0x10:
		if (nlm_chip_is_xls_b())
			return PIC_PCIE_XLSB0_LINK2_IRQ;
		else
			return PIC_PCIE_LINK2_IRQ;
	case 0x18:
		if (nlm_chip_is_xls_b())
			return PIC_PCIE_XLSB0_LINK3_IRQ;
		else
			return PIC_PCIE_LINK3_IRQ;
	}
	WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
	return 0;
}

/* 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)
{
	/* PSB assigns PCI resources */
	pci_probe_only = 1;
	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);

	return 0;
}

arch_initcall(pcibios_init);

struct pci_fixup pcibios_fixups[] = {
	{0}
};