arch/mips/pci/pci-xlp.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2003-2012 Broadcom Corporation
  * 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 Broadcom
  * 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 BROADCOM ``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 BROADCOM 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 <asm/io.h>

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

 #include <asm/netlogic/xlp-hal/iomap.h>
 #include <asm/netlogic/xlp-hal/pic.h>
 #include <asm/netlogic/xlp-hal/xlp.h>
 #include <asm/netlogic/xlp-hal/pcibus.h>
 #include <asm/netlogic/xlp-hal/bridge.h>

 static void *pci_config_base;

 #define	pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (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 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 = 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           = "XLP PCI MEM",
 	.start          = 0xd0000000UL,	/* 256MB PCI mem @ 0xd000_0000 */
 	.end            = 0xdfffffffUL,
 	.flags          = IORESOURCE_MEM,
 };

 static struct resource nlm_pci_io_resource = {
 	.name           = "XLP IO MEM",
 	.start          = 0x14000000UL,	/* 64MB PCI IO @ 0x1000_0000 */
 	.end            = 0x17ffffffUL,
 	.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,
 };

 static int get_irq_vector(const struct pci_dev *dev)
 {
 	/*
 	 * For XLP 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 0x8:
 		return PIC_PCIE_LINK_0_IRQ;
 	case 0x9:
 		return PIC_PCIE_LINK_1_IRQ;
 	case 0xa:
 		return PIC_PCIE_LINK_2_IRQ;
 	case 0xb:
 		return PIC_PCIE_LINK_3_IRQ;
 	}
 	WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
 	return 0;
 }

 int __init 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 xlp_enable_pci_bswap(void)
 {
 	uint64_t pciebase, sysbase;
 	int node, i;
 	u32 reg;

 	/* Chip-0 so node set to 0 */
 	node = 0;
 	sysbase = nlm_get_bridge_regbase(node);
 	/*
 	 *  Enable byte swap in hardware. Program each link's PCIe SWAP regions
 	 * from the link's address ranges.
 	 */
 	for (i = 0; i < 4; i++) {
 		pciebase = nlm_pcicfg_base(XLP_IO_PCIE_OFFSET(node, i));
 		if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
 			continue;

 		reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_BASE0 + i);
 		nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_BASE, reg);

 		reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_LIMIT0 + i);
 		nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_LIM,
 			reg | 0xfff);

 		reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_BASE0 + i);
 		nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_BASE, reg);

 		reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_LIMIT0 + i);
 		nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
 	}
 	return 0;
 }

 static int __init pcibios_init(void)
 {
 	/* Firmware assigns PCI resources */
 	pci_set_flags(PCI_PROBE_ONLY);
 	pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);

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

 	xlp_enable_pci_bswap();
 	set_io_port_base(CKSEG1);
 	nlm_pci_controller.io_map_base = CKSEG1;

 	register_pci_controller(&nlm_pci_controller);
 	pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
 		&nlm_pci_mem_resource);

 	return 0;
 }
 arch_initcall(pcibios_init);
	/*
	* Copyright (c) 2003-2012 Broadcom Corporation
	* 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 Broadcom
	* 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 BROADCOM ``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 BROADCOM 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 <asm/io.h>

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

	#include <asm/netlogic/xlp-hal/iomap.h>
	#include <asm/netlogic/xlp-hal/pic.h>
	#include <asm/netlogic/xlp-hal/xlp.h>
	#include <asm/netlogic/xlp-hal/pcibus.h>
	#include <asm/netlogic/xlp-hal/bridge.h>

	static void *pci_config_base;

	#define pci_cfg_addr(bus, devfn, off) (((bus) << 20) \| ((devfn) << 12) \| (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 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 = 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 = "XLP PCI MEM",
	.start = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
	.end = 0xdfffffffUL,
	.flags = IORESOURCE_MEM,
	};

	static struct resource nlm_pci_io_resource = {
	.name = "XLP IO MEM",
	.start = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
	.end = 0x17ffffffUL,
	.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,
	};

	static int get_irq_vector(const struct pci_dev *dev)
	{
	/*
	* For XLP 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 0x8:
	return PIC_PCIE_LINK_0_IRQ;
	case 0x9:
	return PIC_PCIE_LINK_1_IRQ;
	case 0xa:
	return PIC_PCIE_LINK_2_IRQ;
	case 0xb:
	return PIC_PCIE_LINK_3_IRQ;
	}
	WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
	return 0;
	}

	int __init 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 xlp_enable_pci_bswap(void)
	{
	uint64_t pciebase, sysbase;
	int node, i;
	u32 reg;

	/* Chip-0 so node set to 0 */
	node = 0;
	sysbase = nlm_get_bridge_regbase(node);
	/*
	* Enable byte swap in hardware. Program each link's PCIe SWAP regions
	* from the link's address ranges.
	*/
	for (i = 0; i < 4; i++) {
	pciebase = nlm_pcicfg_base(XLP_IO_PCIE_OFFSET(node, i));
	if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
	continue;

	reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_BASE0 + i);
	nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_BASE, reg);

	reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_LIMIT0 + i);
	nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_LIM,
	reg \| 0xfff);

	reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_BASE0 + i);
	nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_BASE, reg);

	reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_LIMIT0 + i);
	nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_LIM, reg \| 0xfff);
	}
	return 0;
	}

	static int __init pcibios_init(void)
	{
	/* Firmware assigns PCI resources */
	pci_set_flags(PCI_PROBE_ONLY);
	pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);

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

	xlp_enable_pci_bswap();
	set_io_port_base(CKSEG1);
	nlm_pci_controller.io_map_base = CKSEG1;

	register_pci_controller(&nlm_pci_controller);
	pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
	&nlm_pci_mem_resource);

	return 0;
	}
	arch_initcall(pcibios_init);