569 lines
17 KiB
C
569 lines
17 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005-2007 Cavium Networks
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/time.h>
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#include <linux/delay.h>
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#include <asm/time.h>
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#include <asm/octeon/octeon.h>
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#include <asm/octeon/cvmx-npi-defs.h>
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#include <asm/octeon/cvmx-pci-defs.h>
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#include "pci-common.h"
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#define USE_OCTEON_INTERNAL_ARBITER
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/*
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* Octeon's PCI controller uses did=3, subdid=2 for PCI IO
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* addresses. Use PCI endian swapping 1 so no address swapping is
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* necessary. The Linux io routines will endian swap the data.
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*/
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#define OCTEON_PCI_IOSPACE_BASE 0x80011a0400000000ull
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#define OCTEON_PCI_IOSPACE_SIZE (1ull<<32)
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/* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */
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#define OCTEON_PCI_MEMSPACE_OFFSET (0x00011b0000000000ull)
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/**
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* This is the bit decoding used for the Octeon PCI controller addresses
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*/
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union octeon_pci_address {
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uint64_t u64;
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struct {
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uint64_t upper:2;
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uint64_t reserved:13;
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uint64_t io:1;
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uint64_t did:5;
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uint64_t subdid:3;
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uint64_t reserved2:4;
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uint64_t endian_swap:2;
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uint64_t reserved3:10;
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uint64_t bus:8;
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uint64_t dev:5;
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uint64_t func:3;
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uint64_t reg:8;
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} s;
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};
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/**
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* Return the mapping of PCI device number to IRQ line. Each
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* character in the return string represents the interrupt
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* line for the device at that position. Device 1 maps to the
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* first character, etc. The characters A-D are used for PCI
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* interrupts.
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*
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* Returns PCI interrupt mapping
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*/
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const char *octeon_get_pci_interrupts(void)
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{
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/*
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* Returning an empty string causes the interrupts to be
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* routed based on the PCI specification. From the PCI spec:
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*
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* INTA# of Device Number 0 is connected to IRQW on the system
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* board. (Device Number has no significance regarding being
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* located on the system board or in a connector.) INTA# of
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* Device Number 1 is connected to IRQX on the system
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* board. INTA# of Device Number 2 is connected to IRQY on the
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* system board. INTA# of Device Number 3 is connected to IRQZ
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* on the system board. The table below describes how each
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* agent's INTx# lines are connected to the system board
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* interrupt lines. The following equation can be used to
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* determine to which INTx# signal on the system board a given
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* device's INTx# line(s) is connected.
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*
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* MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0,
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* IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I =
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* Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and
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* INTD# = 3)
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*/
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switch (octeon_bootinfo->board_type) {
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case CVMX_BOARD_TYPE_NAO38:
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/* This is really the NAC38 */
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return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA";
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case CVMX_BOARD_TYPE_THUNDER:
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return "";
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case CVMX_BOARD_TYPE_EBH3000:
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return "";
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case CVMX_BOARD_TYPE_EBH3100:
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case CVMX_BOARD_TYPE_CN3010_EVB_HS5:
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case CVMX_BOARD_TYPE_CN3005_EVB_HS5:
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return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
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case CVMX_BOARD_TYPE_BBGW_REF:
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return "AABCD";
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default:
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return "";
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}
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}
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/**
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* Map a PCI device to the appropriate interrupt line
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*
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* @dev: The Linux PCI device structure for the device to map
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* @slot: The slot number for this device on __BUS 0__. Linux
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* enumerates through all the bridges and figures out the
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* slot on Bus 0 where this device eventually hooks to.
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* @pin: The PCI interrupt pin read from the device, then swizzled
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* as it goes through each bridge.
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* Returns Interrupt number for the device
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*/
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int __init octeon_pci_pcibios_map_irq(const struct pci_dev *dev,
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u8 slot, u8 pin)
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{
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int irq_num;
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const char *interrupts;
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int dev_num;
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/* Get the board specific interrupt mapping */
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interrupts = octeon_get_pci_interrupts();
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dev_num = dev->devfn >> 3;
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if (dev_num < strlen(interrupts))
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irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) +
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OCTEON_IRQ_PCI_INT0;
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else
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irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0;
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return irq_num;
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}
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/**
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* Read a value from configuration space
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*
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*/
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static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
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int reg, int size, u32 *val)
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{
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union octeon_pci_address pci_addr;
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pci_addr.u64 = 0;
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pci_addr.s.upper = 2;
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pci_addr.s.io = 1;
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pci_addr.s.did = 3;
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pci_addr.s.subdid = 1;
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pci_addr.s.endian_swap = 1;
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pci_addr.s.bus = bus->number;
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pci_addr.s.dev = devfn >> 3;
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pci_addr.s.func = devfn & 0x7;
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pci_addr.s.reg = reg;
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#if PCI_CONFIG_SPACE_DELAY
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udelay(PCI_CONFIG_SPACE_DELAY);
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#endif
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switch (size) {
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case 4:
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*val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
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return PCIBIOS_SUCCESSFUL;
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case 2:
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*val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
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return PCIBIOS_SUCCESSFUL;
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case 1:
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*val = cvmx_read64_uint8(pci_addr.u64);
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return PCIBIOS_SUCCESSFUL;
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}
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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/**
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* Write a value to PCI configuration space
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*
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* @bus:
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* @devfn:
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* @reg:
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* @size:
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* @val:
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* Returns
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*/
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static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
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int reg, int size, u32 val)
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{
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union octeon_pci_address pci_addr;
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pci_addr.u64 = 0;
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pci_addr.s.upper = 2;
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pci_addr.s.io = 1;
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pci_addr.s.did = 3;
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pci_addr.s.subdid = 1;
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pci_addr.s.endian_swap = 1;
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pci_addr.s.bus = bus->number;
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pci_addr.s.dev = devfn >> 3;
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pci_addr.s.func = devfn & 0x7;
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pci_addr.s.reg = reg;
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#if PCI_CONFIG_SPACE_DELAY
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udelay(PCI_CONFIG_SPACE_DELAY);
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#endif
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switch (size) {
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case 4:
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cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
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return PCIBIOS_SUCCESSFUL;
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case 2:
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cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
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return PCIBIOS_SUCCESSFUL;
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case 1:
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cvmx_write64_uint8(pci_addr.u64, val);
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return PCIBIOS_SUCCESSFUL;
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}
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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static struct pci_ops octeon_pci_ops = {
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octeon_read_config,
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octeon_write_config,
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};
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static struct resource octeon_pci_mem_resource = {
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.start = 0,
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.end = 0,
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.name = "Octeon PCI MEM",
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.flags = IORESOURCE_MEM,
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};
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/*
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* PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI
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* bridge
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*/
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static struct resource octeon_pci_io_resource = {
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.start = 0x4000,
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.end = OCTEON_PCI_IOSPACE_SIZE - 1,
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.name = "Octeon PCI IO",
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.flags = IORESOURCE_IO,
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};
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static struct pci_controller octeon_pci_controller = {
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.pci_ops = &octeon_pci_ops,
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.mem_resource = &octeon_pci_mem_resource,
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.mem_offset = OCTEON_PCI_MEMSPACE_OFFSET,
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.io_resource = &octeon_pci_io_resource,
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.io_offset = 0,
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.io_map_base = OCTEON_PCI_IOSPACE_BASE,
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};
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/**
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* Low level initialize the Octeon PCI controller
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*
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* Returns
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*/
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static void octeon_pci_initialize(void)
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{
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union cvmx_pci_cfg01 cfg01;
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union cvmx_npi_ctl_status ctl_status;
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union cvmx_pci_ctl_status_2 ctl_status_2;
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union cvmx_pci_cfg19 cfg19;
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union cvmx_pci_cfg16 cfg16;
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union cvmx_pci_cfg22 cfg22;
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union cvmx_pci_cfg56 cfg56;
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/* Reset the PCI Bus */
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cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1);
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cvmx_read_csr(CVMX_CIU_SOFT_PRST);
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udelay(2000); /* Hold PCI reset for 2 ms */
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ctl_status.u64 = 0; /* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */
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ctl_status.s.max_word = 1;
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ctl_status.s.timer = 1;
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cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64);
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/* Deassert PCI reset and advertize PCX Host Mode Device Capability
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(64b) */
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cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4);
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cvmx_read_csr(CVMX_CIU_SOFT_PRST);
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udelay(2000); /* Wait 2 ms after deasserting PCI reset */
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ctl_status_2.u32 = 0;
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ctl_status_2.s.tsr_hwm = 1; /* Initializes to 0. Must be set
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before any PCI reads. */
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ctl_status_2.s.bar2pres = 1; /* Enable BAR2 */
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ctl_status_2.s.bar2_enb = 1;
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ctl_status_2.s.bar2_cax = 1; /* Don't use L2 */
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ctl_status_2.s.bar2_esx = 1;
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ctl_status_2.s.pmo_amod = 1; /* Round robin priority */
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if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
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/* BAR1 hole */
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ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS;
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ctl_status_2.s.bb1_siz = 1; /* BAR1 is 2GB */
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ctl_status_2.s.bb_ca = 1; /* Don't use L2 with big bars */
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ctl_status_2.s.bb_es = 1; /* Big bar in byte swap mode */
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ctl_status_2.s.bb1 = 1; /* BAR1 is big */
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ctl_status_2.s.bb0 = 1; /* BAR0 is big */
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}
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octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32);
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udelay(2000); /* Wait 2 ms before doing PCI reads */
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ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2);
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pr_notice("PCI Status: %s %s-bit\n",
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ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI",
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ctl_status_2.s.ap_64ad ? "64" : "32");
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if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
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union cvmx_pci_cnt_reg cnt_reg_start;
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union cvmx_pci_cnt_reg cnt_reg_end;
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unsigned long cycles, pci_clock;
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cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
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cycles = read_c0_cvmcount();
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udelay(1000);
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cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
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cycles = read_c0_cvmcount() - cycles;
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pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) /
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(cycles / (mips_hpt_frequency / 1000000));
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pr_notice("PCI Clock: %lu MHz\n", pci_clock);
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}
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/*
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* TDOMC must be set to one in PCI mode. TDOMC should be set to 4
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* in PCI-X mode to allow four oustanding splits. Otherwise,
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* should not change from its reset value. Don't write PCI_CFG19
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* in PCI mode (0x82000001 reset value), write it to 0x82000004
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* after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero.
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* MRBCM -> must be one.
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*/
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if (ctl_status_2.s.ap_pcix) {
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cfg19.u32 = 0;
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/*
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* Target Delayed/Split request outstanding maximum
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* count. [1..31] and 0=32. NOTE: If the user
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* programs these bits beyond the Designed Maximum
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* outstanding count, then the designed maximum table
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* depth will be used instead. No additional
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* Deferred/Split transactions will be accepted if
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* this outstanding maximum count is
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* reached. Furthermore, no additional deferred/split
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* transactions will be accepted if the I/O delay/ I/O
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* Split Request outstanding maximum is reached.
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*/
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cfg19.s.tdomc = 4;
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/*
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* Master Deferred Read Request Outstanding Max Count
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* (PCI only). CR4C[26:24] Max SAC cycles MAX DAC
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* cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101
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* 5 2 110 6 3 111 7 3 For example, if these bits are
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* programmed to 100, the core can support 2 DAC
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* cycles, 4 SAC cycles or a combination of 1 DAC and
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* 2 SAC cycles. NOTE: For the PCI-X maximum
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* outstanding split transactions, refer to
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* CRE0[22:20].
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*/
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cfg19.s.mdrrmc = 2;
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/*
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* Master Request (Memory Read) Byte Count/Byte Enable
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* select. 0 = Byte Enables valid. In PCI mode, a
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* burst transaction cannot be performed using Memory
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* Read command=4?h6. 1 = DWORD Byte Count valid
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* (default). In PCI Mode, the memory read byte
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* enables are automatically generated by the
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* core. Note: N3 Master Request transaction sizes are
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* always determined through the
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* am_attr[<35:32>|<7:0>] field.
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*/
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cfg19.s.mrbcm = 1;
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octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32);
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}
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cfg01.u32 = 0;
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cfg01.s.msae = 1; /* Memory Space Access Enable */
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cfg01.s.me = 1; /* Master Enable */
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cfg01.s.pee = 1; /* PERR# Enable */
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cfg01.s.see = 1; /* System Error Enable */
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cfg01.s.fbbe = 1; /* Fast Back to Back Transaction Enable */
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octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
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#ifdef USE_OCTEON_INTERNAL_ARBITER
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/*
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* When OCTEON is a PCI host, most systems will use OCTEON's
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* internal arbiter, so must enable it before any PCI/PCI-X
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* traffic can occur.
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*/
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{
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union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg;
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pci_int_arb_cfg.u64 = 0;
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pci_int_arb_cfg.s.en = 1; /* Internal arbiter enable */
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cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64);
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}
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#endif /* USE_OCTEON_INTERNAL_ARBITER */
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/*
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* Preferrably written to 1 to set MLTD. [RDSATI,TRTAE,
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* TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to
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* 1..7.
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*/
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cfg16.u32 = 0;
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cfg16.s.mltd = 1; /* Master Latency Timer Disable */
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octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32);
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/*
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* Should be written to 0x4ff00. MTTV -> must be zero.
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* FLUSH -> must be 1. MRV -> should be 0xFF.
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*/
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cfg22.u32 = 0;
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/* Master Retry Value [1..255] and 0=infinite */
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cfg22.s.mrv = 0xff;
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/*
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* AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper
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* N3K operation.
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*/
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cfg22.s.flush = 1;
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octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32);
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/*
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* MOST Indicates the maximum number of outstanding splits (in -1
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* notation) when OCTEON is in PCI-X mode. PCI-X performance is
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* affected by the MOST selection. Should generally be written
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* with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807,
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* depending on the desired MOST of 3, 2, 1, or 0, respectively.
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*/
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cfg56.u32 = 0;
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cfg56.s.pxcid = 7; /* RO - PCI-X Capability ID */
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cfg56.s.ncp = 0xe8; /* RO - Next Capability Pointer */
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cfg56.s.dpere = 1; /* Data Parity Error Recovery Enable */
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cfg56.s.roe = 1; /* Relaxed Ordering Enable */
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cfg56.s.mmbc = 1; /* Maximum Memory Byte Count
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[0=512B,1=1024B,2=2048B,3=4096B] */
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cfg56.s.most = 3; /* Maximum outstanding Split transactions [0=1
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.. 7=32] */
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octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32);
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/*
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* Affects PCI performance when OCTEON services reads to its
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* BAR1/BAR2. Refer to Section 10.6.1. The recommended values are
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* 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and
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* PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700,
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* these values need to be changed so they won't possibly prefetch off
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* of the end of memory if PCI is DMAing a buffer at the end of
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* memory. Note that these values differ from their reset values.
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*/
|
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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
|
|
*
|
|
* Returns
|
|
*/
|
|
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;
|
|
|
|
/* 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;
|
|
if (!octeon_is_pci_host()) {
|
|
pr_notice("Not in host mode, PCI Controller not initialized\n");
|
|
return 0;
|
|
}
|
|
|
|
pr_notice("%s Octeon big bar support\n",
|
|
(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, 0);
|
|
octeon_npi_write32(CVMX_NPI_PCI_CFG09, 0x80);
|
|
|
|
/* Disable the BAR1 movable mappings */
|
|
for (index = 0; index < 32; index++)
|
|
octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 0);
|
|
|
|
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);
|
|
|
|
/* 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);
|
|
|
|
/* 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);
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(octeon_pci_setup);
|