/*
* 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) 2005-2007 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 <asm/time.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-npi-defs.h>
#include <asm/octeon/cvmx-pci-defs.h>
#include "pci-common.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)
/**
* 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;
};
/**
* 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_THUNDER:
return "";
case CVMX_BOARD_TYPE_EBH3000:
return "";
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";
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
*
* @bus:
* @devfn:
* @reg:
* @size:
* @val:
* Returns
*/
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
*
* Returns
*/
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\n",
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\n", pci_clock);
}
/*
* TDOMC must be set to one in PCI mode. TDOMC should be set to 4
* in PCI-X mode to allow four oustanding 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 */
/*
* Preferrably 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
*
* 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);
