/*
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   * Copyright (C) 2005-2009 Cavium Networks
   */
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/pci.h>
  #include <linux/interrupt.h>
  #include <linux/time.h>
  #include <linux/delay.h>
  #include <linux/platform_device.h>
  #include <linux/swiotlb.h>
  
  #include <asm/time.h>
  
  #include <asm/octeon/octeon.h>
  #include <asm/octeon/cvmx-npi-defs.h>
  #include <asm/octeon/cvmx-pci-defs.h>
  #include <asm/octeon/pci-octeon.h>
  
  #include <dma-coherence.h>
  
  #define USE_OCTEON_INTERNAL_ARBITER
  
  /*
   * Octeon's PCI controller uses did=3, subdid=2 for PCI IO
   * addresses. Use PCI endian swapping 1 so no address swapping is
   * necessary. The Linux io routines will endian swap the data.
   */
  #define OCTEON_PCI_IOSPACE_BASE	    0x80011a0400000000ull
  #define OCTEON_PCI_IOSPACE_SIZE	    (1ull<<32)
  
  /* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */
  #define OCTEON_PCI_MEMSPACE_OFFSET  (0x00011b0000000000ull)
  
  u64 octeon_bar1_pci_phys;
  
  /**
   * This is the bit decoding used for the Octeon PCI controller addresses
   */
  union octeon_pci_address {
  	uint64_t u64;
  	struct {
  		uint64_t upper:2;
  		uint64_t reserved:13;
  		uint64_t io:1;
  		uint64_t did:5;
  		uint64_t subdid:3;
  		uint64_t reserved2:4;
  		uint64_t endian_swap:2;
  		uint64_t reserved3:10;
  		uint64_t bus:8;
  		uint64_t dev:5;
  		uint64_t func:3;
  		uint64_t reg:8;
  	} s;
  };
  
  int __initconst (*octeon_pcibios_map_irq)(const struct pci_dev *dev,
  					 u8 slot, u8 pin);
  enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID;
  
  /**
   * Map a PCI device to the appropriate interrupt line
   *
   * @dev:    The Linux PCI device structure for the device to map
   * @slot:   The slot number for this device on __BUS 0__. Linux
   *		 enumerates through all the bridges and figures out the
   *		 slot on Bus 0 where this device eventually hooks to.
   * @pin:    The PCI interrupt pin read from the device, then swizzled
   *		 as it goes through each bridge.
   * Returns Interrupt number for the device
   */
  int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  {
  	if (octeon_pcibios_map_irq)
  		return octeon_pcibios_map_irq(dev, slot, pin);
  	else
  		panic("octeon_pcibios_map_irq not set.");
  }
  
  
  /*
   * Called to perform platform specific PCI setup
   */
  int pcibios_plat_dev_init(struct pci_dev *dev)
  {
  	uint16_t config;
  	uint32_t dconfig;
  	int pos;
  	/*
  	 * Force the Cache line setting to 64 bytes. The standard
  	 * Linux bus scan doesn't seem to set it. Octeon really has
  	 * 128 byte lines, but Intel bridges get really upset if you
  	 * try and set values above 64 bytes. Value is specified in
  	 * 32bit words.
  	 */
  	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 / 4);
  	/* Set latency timers for all devices */
  	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
  
  	/* Enable reporting System errors and parity errors on all devices */
  	/* Enable parity checking and error reporting */
  	pci_read_config_word(dev, PCI_COMMAND, &config);
  	config |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
  	pci_write_config_word(dev, PCI_COMMAND, config);
  
  	if (dev->subordinate) {
  		/* Set latency timers on sub bridges */
  		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 64);
  		/* More bridge error detection */
  		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &config);
  		config |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
  		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, config);
  	}
  
  	/* Enable the PCIe normal error reporting */
  	config = PCI_EXP_DEVCTL_CERE; /* Correctable Error Reporting */
  	config |= PCI_EXP_DEVCTL_NFERE; /* Non-Fatal Error Reporting */
  	config |= PCI_EXP_DEVCTL_FERE;	/* Fatal Error Reporting */
  	config |= PCI_EXP_DEVCTL_URRE;	/* Unsupported Request */
  	pcie_capability_set_word(dev, PCI_EXP_DEVCTL, config);
  
  	/* Find the Advanced Error Reporting capability */
  	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
  	if (pos) {
  		/* Clear Uncorrectable Error Status */
  		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
  				      &dconfig);
  		pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
  				       dconfig);
  		/* Enable reporting of all uncorrectable errors */
  		/* Uncorrectable Error Mask - turned on bits disable errors */
  		pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, 0);
  		/*
  		 * Leave severity at HW default. This only controls if
  		 * errors are reported as uncorrectable or
  		 * correctable, not if the error is reported.
  		 */
  		/* PCI_ERR_UNCOR_SEVER - Uncorrectable Error Severity */
  		/* Clear Correctable Error Status */
  		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &dconfig);
  		pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, dconfig);
  		/* Enable reporting of all correctable errors */
  		/* Correctable Error Mask - turned on bits disable errors */
  		pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, 0);
  		/* Advanced Error Capabilities */
  		pci_read_config_dword(dev, pos + PCI_ERR_CAP, &dconfig);
  		/* ECRC Generation Enable */
  		if (config & PCI_ERR_CAP_ECRC_GENC)
  			config |= PCI_ERR_CAP_ECRC_GENE;
  		/* ECRC Check Enable */
  		if (config & PCI_ERR_CAP_ECRC_CHKC)
  			config |= PCI_ERR_CAP_ECRC_CHKE;
  		pci_write_config_dword(dev, pos + PCI_ERR_CAP, dconfig);
  		/* PCI_ERR_HEADER_LOG - Header Log Register (16 bytes) */
  		/* Report all errors to the root complex */
  		pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND,
  				       PCI_ERR_ROOT_CMD_COR_EN |
  				       PCI_ERR_ROOT_CMD_NONFATAL_EN |
  				       PCI_ERR_ROOT_CMD_FATAL_EN);
  		/* Clear the Root status register */
  		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &dconfig);
  		pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig);
  	}
  
  	dev->dev.archdata.dma_ops = octeon_pci_dma_map_ops;
  
  	return 0;
  }
  
  /**
   * Return the mapping of PCI device number to IRQ line. Each
   * character in the return string represents the interrupt
   * line for the device at that position. Device 1 maps to the
   * first character, etc. The characters A-D are used for PCI
   * interrupts.
   *
   * Returns PCI interrupt mapping
   */
  const char *octeon_get_pci_interrupts(void)
  {
  	/*
  	 * Returning an empty string causes the interrupts to be
  	 * routed based on the PCI specification. From the PCI spec:
  	 *
  	 * INTA# of Device Number 0 is connected to IRQW on the system
  	 * board.  (Device Number has no significance regarding being
  	 * located on the system board or in a connector.) INTA# of
  	 * Device Number 1 is connected to IRQX on the system
  	 * board. INTA# of Device Number 2 is connected to IRQY on the
  	 * system board. INTA# of Device Number 3 is connected to IRQZ
  	 * on the system board. The table below describes how each
  	 * agent's INTx# lines are connected to the system board
  	 * interrupt lines. The following equation can be used to
  	 * determine to which INTx# signal on the system board a given
  	 * device's INTx# line(s) is connected.
  	 *
  	 * MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0,
  	 * IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I =
  	 * Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and
  	 * INTD# = 3)
  	 */
  	switch (octeon_bootinfo->board_type) {
  	case CVMX_BOARD_TYPE_NAO38:
  		/* This is really the NAC38 */
  		return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA";
  	case CVMX_BOARD_TYPE_EBH3100:
  	case CVMX_BOARD_TYPE_CN3010_EVB_HS5:
  	case CVMX_BOARD_TYPE_CN3005_EVB_HS5:
  		return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
  	case CVMX_BOARD_TYPE_BBGW_REF:
  		return "AABCD";
  	case CVMX_BOARD_TYPE_THUNDER:
  	case CVMX_BOARD_TYPE_EBH3000:
  	default:
  		return "";
  	}
  }
  
  /**
   * Map a PCI device to the appropriate interrupt line
   *
   * @dev:    The Linux PCI device structure for the device to map
   * @slot:   The slot number for this device on __BUS 0__. Linux
   *		 enumerates through all the bridges and figures out the
   *		 slot on Bus 0 where this device eventually hooks to.
   * @pin:    The PCI interrupt pin read from the device, then swizzled
   *		 as it goes through each bridge.
   * Returns Interrupt number for the device
   */
  int __init octeon_pci_pcibios_map_irq(const struct pci_dev *dev,
  				      u8 slot, u8 pin)
  {
  	int irq_num;
  	const char *interrupts;
  	int dev_num;
  
  	/* Get the board specific interrupt mapping */
  	interrupts = octeon_get_pci_interrupts();
  
  	dev_num = dev->devfn >> 3;
  	if (dev_num < strlen(interrupts))
  		irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) +
  			OCTEON_IRQ_PCI_INT0;
  	else
  		irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0;
  	return irq_num;
  }
  
  
  /*
   * Read a value from configuration space
   */
  static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
  			      int reg, int size, u32 *val)
  {
  	union octeon_pci_address pci_addr;
  
  	pci_addr.u64 = 0;
  	pci_addr.s.upper = 2;
  	pci_addr.s.io = 1;
  	pci_addr.s.did = 3;
  	pci_addr.s.subdid = 1;
  	pci_addr.s.endian_swap = 1;
  	pci_addr.s.bus = bus->number;
  	pci_addr.s.dev = devfn >> 3;
  	pci_addr.s.func = devfn & 0x7;
  	pci_addr.s.reg = reg;
  
  #if PCI_CONFIG_SPACE_DELAY
  	udelay(PCI_CONFIG_SPACE_DELAY);
  #endif
  	switch (size) {
  	case 4:
  		*val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
  		return PCIBIOS_SUCCESSFUL;
  	case 2:
  		*val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
  		return PCIBIOS_SUCCESSFUL;
  	case 1:
  		*val = cvmx_read64_uint8(pci_addr.u64);
  		return PCIBIOS_SUCCESSFUL;
  	}
  	return PCIBIOS_FUNC_NOT_SUPPORTED;
  }
  
  
  /*
   * Write a value to PCI configuration space
   */
  static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
  			       int reg, int size, u32 val)
  {
  	union octeon_pci_address pci_addr;
  
  	pci_addr.u64 = 0;
  	pci_addr.s.upper = 2;
  	pci_addr.s.io = 1;
  	pci_addr.s.did = 3;
  	pci_addr.s.subdid = 1;
  	pci_addr.s.endian_swap = 1;
  	pci_addr.s.bus = bus->number;
  	pci_addr.s.dev = devfn >> 3;
  	pci_addr.s.func = devfn & 0x7;
  	pci_addr.s.reg = reg;
  
  #if PCI_CONFIG_SPACE_DELAY
  	udelay(PCI_CONFIG_SPACE_DELAY);
  #endif
  	switch (size) {
  	case 4:
  		cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
  		return PCIBIOS_SUCCESSFUL;
  	case 2:
  		cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
  		return PCIBIOS_SUCCESSFUL;
  	case 1:
  		cvmx_write64_uint8(pci_addr.u64, val);
  		return PCIBIOS_SUCCESSFUL;
  	}
  	return PCIBIOS_FUNC_NOT_SUPPORTED;
  }
  
  
  static struct pci_ops octeon_pci_ops = {
  	octeon_read_config,
  	octeon_write_config,
  };
  
  static struct resource octeon_pci_mem_resource = {
  	.start = 0,
  	.end = 0,
  	.name = "Octeon PCI MEM",
  	.flags = IORESOURCE_MEM,
  };
  
  /*
   * PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI
   * bridge
   */
  static struct resource octeon_pci_io_resource = {
  	.start = 0x4000,
  	.end = OCTEON_PCI_IOSPACE_SIZE - 1,
  	.name = "Octeon PCI IO",
  	.flags = IORESOURCE_IO,
  };
  
  static struct pci_controller octeon_pci_controller = {
  	.pci_ops = &octeon_pci_ops,
  	.mem_resource = &octeon_pci_mem_resource,
  	.mem_offset = OCTEON_PCI_MEMSPACE_OFFSET,
  	.io_resource = &octeon_pci_io_resource,
  	.io_offset = 0,
  	.io_map_base = OCTEON_PCI_IOSPACE_BASE,
  };
  
  
  /*
   * Low level initialize the Octeon PCI controller
   */
  static void octeon_pci_initialize(void)
  {
  	union cvmx_pci_cfg01 cfg01;
  	union cvmx_npi_ctl_status ctl_status;
  	union cvmx_pci_ctl_status_2 ctl_status_2;
  	union cvmx_pci_cfg19 cfg19;
  	union cvmx_pci_cfg16 cfg16;
  	union cvmx_pci_cfg22 cfg22;
  	union cvmx_pci_cfg56 cfg56;
  
  	/* Reset the PCI Bus */
  	cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1);
  	cvmx_read_csr(CVMX_CIU_SOFT_PRST);
  
  	udelay(2000);		/* Hold PCI reset for 2 ms */
  
  	ctl_status.u64 = 0;	/* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */
  	ctl_status.s.max_word = 1;
  	ctl_status.s.timer = 1;
  	cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64);
  
  	/* Deassert PCI reset and advertize PCX Host Mode Device Capability
  	   (64b) */
  	cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4);
  	cvmx_read_csr(CVMX_CIU_SOFT_PRST);
  
  	udelay(2000);		/* Wait 2 ms after deasserting PCI reset */
  
  	ctl_status_2.u32 = 0;
  	ctl_status_2.s.tsr_hwm = 1;	/* Initializes to 0.  Must be set
  					   before any PCI reads. */
  	ctl_status_2.s.bar2pres = 1;	/* Enable BAR2 */
  	ctl_status_2.s.bar2_enb = 1;
  	ctl_status_2.s.bar2_cax = 1;	/* Don't use L2 */
  	ctl_status_2.s.bar2_esx = 1;
  	ctl_status_2.s.pmo_amod = 1;	/* Round robin priority */
  	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
  		/* BAR1 hole */
  		ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS;
  		ctl_status_2.s.bb1_siz = 1;  /* BAR1 is 2GB */
  		ctl_status_2.s.bb_ca = 1;    /* Don't use L2 with big bars */
  		ctl_status_2.s.bb_es = 1;    /* Big bar in byte swap mode */
  		ctl_status_2.s.bb1 = 1;	     /* BAR1 is big */
  		ctl_status_2.s.bb0 = 1;	     /* BAR0 is big */
  	}
  
  	octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32);
  	udelay(2000);		/* Wait 2 ms before doing PCI reads */
  
  	ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2);
  	pr_notice("PCI Status: %s %s-bit
  ",
  		  ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI",
  		  ctl_status_2.s.ap_64ad ? "64" : "32");
  
  	if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
  		union cvmx_pci_cnt_reg cnt_reg_start;
  		union cvmx_pci_cnt_reg cnt_reg_end;
  		unsigned long cycles, pci_clock;
  
  		cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
  		cycles = read_c0_cvmcount();
  		udelay(1000);
  		cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
  		cycles = read_c0_cvmcount() - cycles;
  		pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) /
  			    (cycles / (mips_hpt_frequency / 1000000));
  		pr_notice("PCI Clock: %lu MHz
  ", pci_clock);
  	}
  
  	/*
  	 * TDOMC must be set to one in PCI mode. TDOMC should be set to 4
  	 * in PCI-X mode to allow four outstanding splits. Otherwise,
  	 * should not change from its reset value. Don't write PCI_CFG19
  	 * in PCI mode (0x82000001 reset value), write it to 0x82000004
  	 * after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero.
  	 * MRBCM -> must be one.
  	 */
  	if (ctl_status_2.s.ap_pcix) {
  		cfg19.u32 = 0;
  		/*
  		 * Target Delayed/Split request outstanding maximum
  		 * count. [1..31] and 0=32.  NOTE: If the user
  		 * programs these bits beyond the Designed Maximum
  		 * outstanding count, then the designed maximum table
  		 * depth will be used instead.	No additional
  		 * Deferred/Split transactions will be accepted if
  		 * this outstanding maximum count is
  		 * reached. Furthermore, no additional deferred/split
  		 * transactions will be accepted if the I/O delay/ I/O
  		 * Split Request outstanding maximum is reached.
  		 */
  		cfg19.s.tdomc = 4;
  		/*
  		 * Master Deferred Read Request Outstanding Max Count
  		 * (PCI only).	CR4C[26:24] Max SAC cycles MAX DAC
  		 * cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101
  		 * 5 2 110 6 3 111 7 3 For example, if these bits are
  		 * programmed to 100, the core can support 2 DAC
  		 * cycles, 4 SAC cycles or a combination of 1 DAC and
  		 * 2 SAC cycles. NOTE: For the PCI-X maximum
  		 * outstanding split transactions, refer to
  		 * CRE0[22:20].
  		 */
  		cfg19.s.mdrrmc = 2;
  		/*
  		 * Master Request (Memory Read) Byte Count/Byte Enable
  		 * select. 0 = Byte Enables valid. In PCI mode, a
  		 * burst transaction cannot be performed using Memory
  		 * Read command=4?h6. 1 = DWORD Byte Count valid
  		 * (default). In PCI Mode, the memory read byte
  		 * enables are automatically generated by the
  		 * core. Note: N3 Master Request transaction sizes are
  		 * always determined through the
  		 * am_attr[<35:32>|<7:0>] field.
  		 */
  		cfg19.s.mrbcm = 1;
  		octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32);
  	}
  
  
  	cfg01.u32 = 0;
  	cfg01.s.msae = 1;	/* Memory Space Access Enable */
  	cfg01.s.me = 1;		/* Master Enable */
  	cfg01.s.pee = 1;	/* PERR# Enable */
  	cfg01.s.see = 1;	/* System Error Enable */
  	cfg01.s.fbbe = 1;	/* Fast Back to Back Transaction Enable */
  
  	octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
  
  #ifdef USE_OCTEON_INTERNAL_ARBITER
  	/*
  	 * When OCTEON is a PCI host, most systems will use OCTEON's
  	 * internal arbiter, so must enable it before any PCI/PCI-X
  	 * traffic can occur.
  	 */
  	{
  		union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg;
  
  		pci_int_arb_cfg.u64 = 0;
  		pci_int_arb_cfg.s.en = 1;	/* Internal arbiter enable */
  		cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64);
  	}
  #endif	/* USE_OCTEON_INTERNAL_ARBITER */
  
  	/*
  	 * Preferably written to 1 to set MLTD. [RDSATI,TRTAE,
  	 * TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to
  	 * 1..7.
  	 */
  	cfg16.u32 = 0;
  	cfg16.s.mltd = 1;	/* Master Latency Timer Disable */
  	octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32);
  
  	/*
  	 * Should be written to 0x4ff00. MTTV -> must be zero.
  	 * FLUSH -> must be 1. MRV -> should be 0xFF.
  	 */
  	cfg22.u32 = 0;
  	/* Master Retry Value [1..255] and 0=infinite */
  	cfg22.s.mrv = 0xff;
  	/*
  	 * AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper
  	 * N3K operation.
  	 */
  	cfg22.s.flush = 1;
  	octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32);
  
  	/*
  	 * MOST Indicates the maximum number of outstanding splits (in -1
  	 * notation) when OCTEON is in PCI-X mode.  PCI-X performance is
  	 * affected by the MOST selection.  Should generally be written
  	 * with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807,
  	 * depending on the desired MOST of 3, 2, 1, or 0, respectively.
  	 */
  	cfg56.u32 = 0;
  	cfg56.s.pxcid = 7;	/* RO - PCI-X Capability ID */
  	cfg56.s.ncp = 0xe8;	/* RO - Next Capability Pointer */
  	cfg56.s.dpere = 1;	/* Data Parity Error Recovery Enable */
  	cfg56.s.roe = 1;	/* Relaxed Ordering Enable */
  	cfg56.s.mmbc = 1;	/* Maximum Memory Byte Count
  				   [0=512B,1=1024B,2=2048B,3=4096B] */
  	cfg56.s.most = 3;	/* Maximum outstanding Split transactions [0=1
  				   .. 7=32] */
  
  	octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32);
  
  	/*
  	 * Affects PCI performance when OCTEON services reads to its
  	 * BAR1/BAR2. Refer to Section 10.6.1.	The recommended values are
  	 * 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and
  	 * PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700,
  	 * these values need to be changed so they won't possibly prefetch off
  	 * of the end of memory if PCI is DMAing a buffer at the end of
  	 * memory. Note that these values differ from their reset values.
  	 */
  	octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_6, 0x21);
  	octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_C, 0x31);
  	octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_E, 0x31);
  }
  
  
  /*
   * Initialize the Octeon PCI controller
   */
  static int __init octeon_pci_setup(void)
  {
  	union cvmx_npi_mem_access_subidx mem_access;
  	int index;
  
  	/* Only these chips have PCI */
  	if (octeon_has_feature(OCTEON_FEATURE_PCIE))
  		return 0;
  
  	/* Point pcibios_map_irq() to the PCI version of it */
  	octeon_pcibios_map_irq = octeon_pci_pcibios_map_irq;
  
  	/* Only use the big bars on chips that support it */
  	if (OCTEON_IS_MODEL(OCTEON_CN31XX) ||
  	    OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) ||
  	    OCTEON_IS_MODEL(OCTEON_CN38XX_PASS1))
  		octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_SMALL;
  	else
  		octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_BIG;
  
  	if (!octeon_is_pci_host()) {
  		pr_notice("Not in host mode, PCI Controller not initialized
  ");
  		return 0;
  	}
  
  	/* PCI I/O and PCI MEM values */
  	set_io_port_base(OCTEON_PCI_IOSPACE_BASE);
  	ioport_resource.start = 0;
  	ioport_resource.end = OCTEON_PCI_IOSPACE_SIZE - 1;
  
  	pr_notice("%s Octeon big bar support
  ",
  		  (octeon_dma_bar_type ==
  		  OCTEON_DMA_BAR_TYPE_BIG) ? "Enabling" : "Disabling");
  
  	octeon_pci_initialize();
  
  	mem_access.u64 = 0;
  	mem_access.s.esr = 1;	/* Endian-Swap on read. */
  	mem_access.s.esw = 1;	/* Endian-Swap on write. */
  	mem_access.s.nsr = 0;	/* No-Snoop on read. */
  	mem_access.s.nsw = 0;	/* No-Snoop on write. */
  	mem_access.s.ror = 0;	/* Relax Read on read. */
  	mem_access.s.row = 0;	/* Relax Order on write. */
  	mem_access.s.ba = 0;	/* PCI Address bits [63:36]. */
  	cvmx_write_csr(CVMX_NPI_MEM_ACCESS_SUBID3, mem_access.u64);
  
  	/*
  	 * Remap the Octeon BAR 2 above all 32 bit devices
  	 * (0x8000000000ul).  This is done here so it is remapped
  	 * before the readl()'s below. We don't want BAR2 overlapping
  	 * with BAR0/BAR1 during these reads.
  	 */
  	octeon_npi_write32(CVMX_NPI_PCI_CFG08,
  			   (u32)(OCTEON_BAR2_PCI_ADDRESS & 0xffffffffull));
  	octeon_npi_write32(CVMX_NPI_PCI_CFG09,
  			   (u32)(OCTEON_BAR2_PCI_ADDRESS >> 32));
  
  	if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
  		/* Remap the Octeon BAR 0 to 0-2GB */
  		octeon_npi_write32(CVMX_NPI_PCI_CFG04, 0);
  		octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
  
  		/*
  		 * Remap the Octeon BAR 1 to map 2GB-4GB (minus the
  		 * BAR 1 hole).
  		 */
  		octeon_npi_write32(CVMX_NPI_PCI_CFG06, 2ul << 30);
  		octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
  
  		/* BAR1 movable mappings set for identity mapping */
  		octeon_bar1_pci_phys = 0x80000000ull;
  		for (index = 0; index < 32; index++) {
  			union cvmx_pci_bar1_indexx bar1_index;
  
  			bar1_index.u32 = 0;
  			/* Address bits[35:22] sent to L2C */
  			bar1_index.s.addr_idx =
  				(octeon_bar1_pci_phys >> 22) + index;
  			/* Don't put PCI accesses in L2. */
  			bar1_index.s.ca = 1;
  			/* Endian Swap Mode */
  			bar1_index.s.end_swp = 1;
  			/* Set '1' when the selected address range is valid. */
  			bar1_index.s.addr_v = 1;
  			octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
  					   bar1_index.u32);
  		}
  
  		/* Devices go after BAR1 */
  		octeon_pci_mem_resource.start =
  			OCTEON_PCI_MEMSPACE_OFFSET + (4ul << 30) -
  			(OCTEON_PCI_BAR1_HOLE_SIZE << 20);
  		octeon_pci_mem_resource.end =
  			octeon_pci_mem_resource.start + (1ul << 30);
  	} else {
  		/* Remap the Octeon BAR 0 to map 128MB-(128MB+4KB) */
  		octeon_npi_write32(CVMX_NPI_PCI_CFG04, 128ul << 20);
  		octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);
  
  		/* Remap the Octeon BAR 1 to map 0-128MB */
  		octeon_npi_write32(CVMX_NPI_PCI_CFG06, 0);
  		octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);
  
  		/* BAR1 movable regions contiguous to cover the swiotlb */
  		octeon_bar1_pci_phys =
  			virt_to_phys(octeon_swiotlb) & ~((1ull << 22) - 1);
  
  		for (index = 0; index < 32; index++) {
  			union cvmx_pci_bar1_indexx bar1_index;
  
  			bar1_index.u32 = 0;
  			/* Address bits[35:22] sent to L2C */
  			bar1_index.s.addr_idx =
  				(octeon_bar1_pci_phys >> 22) + index;
  			/* Don't put PCI accesses in L2. */
  			bar1_index.s.ca = 1;
  			/* Endian Swap Mode */
  			bar1_index.s.end_swp = 1;
  			/* Set '1' when the selected address range is valid. */
  			bar1_index.s.addr_v = 1;
  			octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
  					   bar1_index.u32);
  		}
  
  		/* Devices go after BAR0 */
  		octeon_pci_mem_resource.start =
  			OCTEON_PCI_MEMSPACE_OFFSET + (128ul << 20) +
  			(4ul << 10);
  		octeon_pci_mem_resource.end =
  			octeon_pci_mem_resource.start + (1ul << 30);
  	}
  
  	register_pci_controller(&octeon_pci_controller);
  
  	/*
  	 * Clear any errors that might be pending from before the bus
  	 * was setup properly.
  	 */
  	cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);
  
  	if (IS_ERR(platform_device_register_simple("octeon_pci_edac",
  						   -1, NULL, 0)))
  		pr_err("Registation of co_pci_edac failed!
  ");
  
  	octeon_pci_dma_init();
  
  	return 0;
  }
  
  arch_initcall(octeon_pci_setup);