arch/tile/include/asm/pci.h - kernel/lockdown - Git at Google

 /*
  * Copyright 2010 Tilera Corporation. All Rights Reserved.
  *
  *   This program is free software; you can redistribute it and/or
  *   modify it under the terms of the GNU General Public License
  *   as published by the Free Software Foundation, version 2.
  *
  *   This program is distributed in the hope that it will be useful, but
  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  *   NON INFRINGEMENT.  See the GNU General Public License for
  *   more details.
  */

 #ifndef _ASM_TILE_PCI_H
 #define _ASM_TILE_PCI_H

 #include <linux/dma-mapping.h>
 #include <linux/pci.h>
 #include <asm-generic/pci_iomap.h>

 #ifndef __tilegx__

 /*
  * Structure of a PCI controller (host bridge)
  */
 struct pci_controller {
 	int index;		/* PCI domain number */
 	struct pci_bus *root_bus;

 	int last_busno;

 	int hv_cfg_fd[2];	/* config{0,1} fds for this PCIe controller */
 	int hv_mem_fd;		/* fd to Hypervisor for MMIO operations */

 	struct pci_ops *ops;

 	int irq_base;		/* Base IRQ from the Hypervisor	*/
 	int plx_gen1;		/* flag for PLX Gen 1 configuration */

 	/* Address ranges that are routed to this controller/bridge. */
 	struct resource mem_resources[3];
 };

 /*
  * This flag tells if the platform is TILEmpower that needs
  * special configuration for the PLX switch chip.
  */
 extern int tile_plx_gen1;

 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}

 #define	TILE_NUM_PCIE	2

 /*
  * The hypervisor maps the entirety of CPA-space as bus addresses, so
  * bus addresses are physical addresses.  The networking and block
  * device layers use this boolean for bounce buffer decisions.
  */
 #define PCI_DMA_BUS_IS_PHYS     1

 /* generic pci stuff */
 #include <asm-generic/pci.h>

 #else

 #include <asm/page.h>
 #include <gxio/trio.h>

 /**
  * We reserve the hugepage-size address range at the top of the 64-bit address
  * space to serve as the PCI window, emulating the BAR0 space of an endpoint
  * device. This window is used by the chip-to-chip applications running on
  * the RC node. The reason for carving out this window is that Mem-Maps that
  * back up this window will not overlap with those that map the real physical
  * memory.
  */
 #define PCIE_HOST_BAR0_SIZE		HPAGE_SIZE
 #define PCIE_HOST_BAR0_START		HPAGE_MASK

 /**
  * The first PAGE_SIZE of the above "BAR" window is mapped to the
  * gxpci_host_regs structure.
  */
 #define PCIE_HOST_REGS_SIZE		PAGE_SIZE

 /*
  * This is the PCI address where the Mem-Map interrupt regions start.
  * We use the 2nd to the last huge page of the 64-bit address space.
  * The last huge page is used for the rootcomplex "bar", for C2C purpose.
  */
 #define	MEM_MAP_INTR_REGIONS_BASE	(HPAGE_MASK - HPAGE_SIZE)

 /*
  * Each Mem-Map interrupt region occupies 4KB.
  */
 #define	MEM_MAP_INTR_REGION_SIZE	(1 << TRIO_MAP_MEM_LIM__ADDR_SHIFT)

 /*
  * Allocate the PCI BAR window right below 4GB.
  */
 #define	TILE_PCI_BAR_WINDOW_TOP		(1ULL << 32)

 /*
  * Allocate 1GB for the PCI BAR window.
  */
 #define	TILE_PCI_BAR_WINDOW_SIZE	(1 << 30)

 /*
  * This is the highest bus address targeting the host memory that
  * can be generated by legacy PCI devices with 32-bit or less
  * DMA capability, dictated by the BAR window size and location.
  */
 #define	TILE_PCI_MAX_DIRECT_DMA_ADDRESS \
 	(TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE - 1)

 /*
  * We shift the PCI bus range for all the physical memory up by the whole PA
  * range. The corresponding CPA of an incoming PCI request will be the PCI
  * address minus TILE_PCI_MEM_MAP_BASE_OFFSET. This also implies
  * that the 64-bit capable devices will be given DMA addresses as
  * the CPA plus TILE_PCI_MEM_MAP_BASE_OFFSET. To support 32-bit
  * devices, we create a separate map region that handles the low
  * 4GB.
  *
  * This design lets us avoid the "PCI hole" problem where the host bridge
  * won't pass DMA traffic with target addresses that happen to fall within the
  * BAR space. This enables us to use all the physical memory for DMA, instead
  * of wasting the same amount of physical memory as the BAR window size.
  */
 #define	TILE_PCI_MEM_MAP_BASE_OFFSET	(1ULL << CHIP_PA_WIDTH())

 /*
  * Start of the PCI memory resource, which starts at the end of the
  * maximum system physical RAM address.
  */
 #define	TILE_PCI_MEM_START	(1ULL << CHIP_PA_WIDTH())

 /*
  * Structure of a PCI controller (host bridge) on Gx.
  */
 struct pci_controller {

 	/* Pointer back to the TRIO that this PCIe port is connected to. */
 	gxio_trio_context_t *trio;
 	int mac;		/* PCIe mac index on the TRIO shim */
 	int trio_index;		/* Index of TRIO shim that contains the MAC. */

 	int pio_mem_index;	/* PIO region index for memory access */

 #ifdef CONFIG_TILE_PCI_IO
 	int pio_io_index;	/* PIO region index for I/O space access */
 #endif

 	/*
 	 * Mem-Map regions for all the memory controllers so that Linux can
 	 * map all of its physical memory space to the PCI bus.
 	 */
 	int mem_maps[MAX_NUMNODES];

 	int index;		/* PCI domain number */
 	struct pci_bus *root_bus;

 	/* PCI I/O space resource for this controller. */
 	struct resource io_space;
 	char io_space_name[32];

 	/* PCI memory space resource for this controller. */
 	struct resource mem_space;
 	char mem_space_name[32];

 	uint64_t mem_offset;	/* cpu->bus memory mapping offset. */

 	int first_busno;

 	struct pci_ops *ops;

 	/* Table that maps the INTx numbers to Linux irq numbers. */
 	int irq_intx_table[4];
 };

 extern struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
 extern gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
 extern int num_trio_shims;

 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);

 /*
  * The PCI address space does not equal the physical memory address
  * space (we have an IOMMU). The IDE and SCSI device layers use this
  * boolean for bounce buffer decisions.
  */
 #define PCI_DMA_BUS_IS_PHYS     0

 #endif /* __tilegx__ */

 int __init tile_pci_init(void);
 int __init pcibios_init(void);

 void pcibios_fixup_bus(struct pci_bus *bus);

 #define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)

 /*
  * This decides whether to display the domain number in /proc.
  */
 static inline int pci_proc_domain(struct pci_bus *bus)
 {
 	return 1;
 }

 /*
  * pcibios_assign_all_busses() tells whether or not the bus numbers
  * should be reassigned, in case the BIOS didn't do it correctly, or
  * in case we don't have a BIOS and we want to let Linux do it.
  */
 static inline int pcibios_assign_all_busses(void)
 {
 	return 1;
 }

 #define PCIBIOS_MIN_MEM		0
 /* Minimum PCI I/O address, starting at the page boundary. */
 #define PCIBIOS_MIN_IO		PAGE_SIZE

 /* Use any cpu for PCI. */
 #define cpumask_of_pcibus(bus) cpu_online_mask

 /* implement the pci_ DMA API in terms of the generic device dma_ one */
 #include <asm-generic/pci-dma-compat.h>

 #endif /* _ASM_TILE_PCI_H */
	/*
	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation, version 2.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	* NON INFRINGEMENT. See the GNU General Public License for
	* more details.
	*/

	#ifndef _ASM_TILE_PCI_H
	#define _ASM_TILE_PCI_H

	#include <linux/dma-mapping.h>
	#include <linux/pci.h>
	#include <asm-generic/pci_iomap.h>

	#ifndef __tilegx__

	/*
	* Structure of a PCI controller (host bridge)
	*/
	struct pci_controller {
	int index; /* PCI domain number */
	struct pci_bus *root_bus;

	int last_busno;

	int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */
	int hv_mem_fd; /* fd to Hypervisor for MMIO operations */

	struct pci_ops *ops;

	int irq_base; /* Base IRQ from the Hypervisor */
	int plx_gen1; /* flag for PLX Gen 1 configuration */

	/* Address ranges that are routed to this controller/bridge. */
	struct resource mem_resources[3];
	};

	/*
	* This flag tells if the platform is TILEmpower that needs
	* special configuration for the PLX switch chip.
	*/
	extern int tile_plx_gen1;

	static inline void pci_iounmap(struct pci_dev dev, void __iomem addr) {}

	#define TILE_NUM_PCIE 2

	/*
	* The hypervisor maps the entirety of CPA-space as bus addresses, so
	* bus addresses are physical addresses. The networking and block
	* device layers use this boolean for bounce buffer decisions.
	*/
	#define PCI_DMA_BUS_IS_PHYS 1

	/* generic pci stuff */
	#include <asm-generic/pci.h>

	#else

	#include <asm/page.h>
	#include <gxio/trio.h>

	/**
	* We reserve the hugepage-size address range at the top of the 64-bit address
	* space to serve as the PCI window, emulating the BAR0 space of an endpoint
	* device. This window is used by the chip-to-chip applications running on
	* the RC node. The reason for carving out this window is that Mem-Maps that
	* back up this window will not overlap with those that map the real physical
	* memory.
	*/
	#define PCIE_HOST_BAR0_SIZE HPAGE_SIZE
	#define PCIE_HOST_BAR0_START HPAGE_MASK

	/**
	* The first PAGE_SIZE of the above "BAR" window is mapped to the
	* gxpci_host_regs structure.
	*/
	#define PCIE_HOST_REGS_SIZE PAGE_SIZE

	/*
	* This is the PCI address where the Mem-Map interrupt regions start.
	* We use the 2nd to the last huge page of the 64-bit address space.
	* The last huge page is used for the rootcomplex "bar", for C2C purpose.
	*/
	#define MEM_MAP_INTR_REGIONS_BASE (HPAGE_MASK - HPAGE_SIZE)

	/*
	* Each Mem-Map interrupt region occupies 4KB.
	*/
	#define MEM_MAP_INTR_REGION_SIZE (1 << TRIO_MAP_MEM_LIM__ADDR_SHIFT)

	/*
	* Allocate the PCI BAR window right below 4GB.
	*/
	#define TILE_PCI_BAR_WINDOW_TOP (1ULL << 32)

	/*
	* Allocate 1GB for the PCI BAR window.
	*/
	#define TILE_PCI_BAR_WINDOW_SIZE (1 << 30)

	/*
	* This is the highest bus address targeting the host memory that
	* can be generated by legacy PCI devices with 32-bit or less
	* DMA capability, dictated by the BAR window size and location.
	*/
	#define TILE_PCI_MAX_DIRECT_DMA_ADDRESS \
	(TILE_PCI_BAR_WINDOW_TOP - TILE_PCI_BAR_WINDOW_SIZE - 1)

	/*
	* We shift the PCI bus range for all the physical memory up by the whole PA
	* range. The corresponding CPA of an incoming PCI request will be the PCI
	* address minus TILE_PCI_MEM_MAP_BASE_OFFSET. This also implies
	* that the 64-bit capable devices will be given DMA addresses as
	* the CPA plus TILE_PCI_MEM_MAP_BASE_OFFSET. To support 32-bit
	* devices, we create a separate map region that handles the low
	* 4GB.
	*
	* This design lets us avoid the "PCI hole" problem where the host bridge
	* won't pass DMA traffic with target addresses that happen to fall within the
	* BAR space. This enables us to use all the physical memory for DMA, instead
	* of wasting the same amount of physical memory as the BAR window size.
	*/
	#define TILE_PCI_MEM_MAP_BASE_OFFSET (1ULL << CHIP_PA_WIDTH())

	/*
	* Start of the PCI memory resource, which starts at the end of the
	* maximum system physical RAM address.
	*/
	#define TILE_PCI_MEM_START (1ULL << CHIP_PA_WIDTH())

	/*
	* Structure of a PCI controller (host bridge) on Gx.
	*/
	struct pci_controller {

	/* Pointer back to the TRIO that this PCIe port is connected to. */
	gxio_trio_context_t *trio;
	int mac; /* PCIe mac index on the TRIO shim */
	int trio_index; /* Index of TRIO shim that contains the MAC. */

	int pio_mem_index; /* PIO region index for memory access */

	#ifdef CONFIG_TILE_PCI_IO
	int pio_io_index; /* PIO region index for I/O space access */
	#endif

	/*
	* Mem-Map regions for all the memory controllers so that Linux can
	* map all of its physical memory space to the PCI bus.
	*/
	int mem_maps[MAX_NUMNODES];

	int index; /* PCI domain number */
	struct pci_bus *root_bus;

	/* PCI I/O space resource for this controller. */
	struct resource io_space;
	char io_space_name[32];

	/* PCI memory space resource for this controller. */
	struct resource mem_space;
	char mem_space_name[32];

	uint64_t mem_offset; /* cpu->bus memory mapping offset. */

	int first_busno;

	struct pci_ops *ops;

	/* Table that maps the INTx numbers to Linux irq numbers. */
	int irq_intx_table[4];
	};

	extern struct pci_controller pci_controllers[TILEGX_NUM_TRIO * TILEGX_TRIO_PCIES];
	extern gxio_trio_context_t trio_contexts[TILEGX_NUM_TRIO];
	extern int num_trio_shims;

	extern void pci_iounmap(struct pci_dev dev, void __iomem );

	/*
	* The PCI address space does not equal the physical memory address
	* space (we have an IOMMU). The IDE and SCSI device layers use this
	* boolean for bounce buffer decisions.
	*/
	#define PCI_DMA_BUS_IS_PHYS 0

	#endif /* __tilegx__ */

	int __init tile_pci_init(void);
	int __init pcibios_init(void);

	void pcibios_fixup_bus(struct pci_bus *bus);

	#define pci_domain_nr(bus) (((struct pci_controller *)(bus)->sysdata)->index)

	/*
	* This decides whether to display the domain number in /proc.
	*/
	static inline int pci_proc_domain(struct pci_bus *bus)
	{
	return 1;
	}

	/*
	* pcibios_assign_all_busses() tells whether or not the bus numbers
	* should be reassigned, in case the BIOS didn't do it correctly, or
	* in case we don't have a BIOS and we want to let Linux do it.
	*/
	static inline int pcibios_assign_all_busses(void)
	{
	return 1;
	}

	#define PCIBIOS_MIN_MEM 0
	/* Minimum PCI I/O address, starting at the page boundary. */
	#define PCIBIOS_MIN_IO PAGE_SIZE

	/* Use any cpu for PCI. */
	#define cpumask_of_pcibus(bus) cpu_online_mask

	/* implement the pci_ DMA API in terms of the generic device dma_ one */
	#include <asm-generic/pci-dma-compat.h>

	#endif /* _ASM_TILE_PCI_H */