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linux/arch/mips/pci/pcie-octeon.c
David Daney 2b5987abaf MIPS: Octeon: Allow more than 3.75GB of memory with PCIe 
We reserve the 3.75GB - 4GB region of PCIe address space for device to
device transfers, making the corresponding physical memory under
direct mapping unavailable for DMA.

To allow for PCIe DMA to all physical memory we map this chunk of
physical memory with BAR1.  Because of the resulting discontinuity in
the mapping function, we remove a page of memory at each end of the
range so multi-page DMA buffers can never be allocated that span the
range.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1535/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2010-08-05 13:26:31 +01:00

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/*
* 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) 2007, 2008 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/octeon/octeon.h>
#include <asm/octeon/cvmx-npei-defs.h>
#include <asm/octeon/cvmx-pciercx-defs.h>
#include <asm/octeon/cvmx-pescx-defs.h>
#include <asm/octeon/cvmx-pexp-defs.h>
#include <asm/octeon/cvmx-helper-errata.h>
#include <asm/octeon/pci-octeon.h>
union cvmx_pcie_address {
uint64_t u64;
struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 1 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t es:2; /* Endian swap = 1 */
uint64_t port:2; /* PCIe port 0,1 */
uint64_t reserved_29_31:3; /* Must be zero */
/*
* Selects the type of the configuration request (0 = type 0,
* 1 = type 1).
*/
uint64_t ty:1;
/* Target bus number sent in the ID in the request. */
uint64_t bus:8;
/*
* Target device number sent in the ID in the
* request. Note that Dev must be zero for type 0
* configuration requests.
*/
uint64_t dev:5;
/* Target function number sent in the ID in the request. */
uint64_t func:3;
/*
* Selects a register in the configuration space of
* the target.
*/
uint64_t reg:12;
} config;
struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 2 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t es:2; /* Endian swap = 1 */
uint64_t port:2; /* PCIe port 0,1 */
uint64_t address:32; /* PCIe IO address */
} io;
struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 3-6 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t address:36; /* PCIe Mem address */
} mem;
};
/**
* Return the Core virtual base address for PCIe IO access. IOs are
* read/written as an offset from this address.
*
* @pcie_port: PCIe port the IO is for
*
* Returns 64bit Octeon IO base address for read/write
*/
static inline uint64_t cvmx_pcie_get_io_base_address(int pcie_port)
{
union cvmx_pcie_address pcie_addr;
pcie_addr.u64 = 0;
pcie_addr.io.upper = 0;
pcie_addr.io.io = 1;
pcie_addr.io.did = 3;
pcie_addr.io.subdid = 2;
pcie_addr.io.es = 1;
pcie_addr.io.port = pcie_port;
return pcie_addr.u64;
}
/**
* Size of the IO address region returned at address
* cvmx_pcie_get_io_base_address()
*
* @pcie_port: PCIe port the IO is for
*
* Returns Size of the IO window
*/
static inline uint64_t cvmx_pcie_get_io_size(int pcie_port)
{
return 1ull << 32;
}
/**
* Return the Core virtual base address for PCIe MEM access. Memory is
* read/written as an offset from this address.
*
* @pcie_port: PCIe port the IO is for
*
* Returns 64bit Octeon IO base address for read/write
*/
static inline uint64_t cvmx_pcie_get_mem_base_address(int pcie_port)
{
union cvmx_pcie_address pcie_addr;
pcie_addr.u64 = 0;
pcie_addr.mem.upper = 0;
pcie_addr.mem.io = 1;
pcie_addr.mem.did = 3;
pcie_addr.mem.subdid = 3 + pcie_port;
return pcie_addr.u64;
}
/**
* Size of the Mem address region returned at address
* cvmx_pcie_get_mem_base_address()
*
* @pcie_port: PCIe port the IO is for
*
* Returns Size of the Mem window
*/
static inline uint64_t cvmx_pcie_get_mem_size(int pcie_port)
{
return 1ull << 36;
}
/**
* Read a PCIe config space register indirectly. This is used for
* registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
*
* @pcie_port: PCIe port to read from
* @cfg_offset: Address to read
*
* Returns Value read
*/
static uint32_t cvmx_pcie_cfgx_read(int pcie_port, uint32_t cfg_offset)
{
union cvmx_pescx_cfg_rd pescx_cfg_rd;
pescx_cfg_rd.u64 = 0;
pescx_cfg_rd.s.addr = cfg_offset;
cvmx_write_csr(CVMX_PESCX_CFG_RD(pcie_port), pescx_cfg_rd.u64);
pescx_cfg_rd.u64 = cvmx_read_csr(CVMX_PESCX_CFG_RD(pcie_port));
return pescx_cfg_rd.s.data;
}
/**
* Write a PCIe config space register indirectly. This is used for
* registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
*
* @pcie_port: PCIe port to write to
* @cfg_offset: Address to write
* @val: Value to write
*/
static void cvmx_pcie_cfgx_write(int pcie_port, uint32_t cfg_offset,
uint32_t val)
{
union cvmx_pescx_cfg_wr pescx_cfg_wr;
pescx_cfg_wr.u64 = 0;
pescx_cfg_wr.s.addr = cfg_offset;
pescx_cfg_wr.s.data = val;
cvmx_write_csr(CVMX_PESCX_CFG_WR(pcie_port), pescx_cfg_wr.u64);
}
/**
* Build a PCIe config space request address for a device
*
* @pcie_port: PCIe port to access
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
*
* Returns 64bit Octeon IO address
*/
static inline uint64_t __cvmx_pcie_build_config_addr(int pcie_port, int bus,
int dev, int fn, int reg)
{
union cvmx_pcie_address pcie_addr;
union cvmx_pciercx_cfg006 pciercx_cfg006;
pciercx_cfg006.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG006(pcie_port));
if ((bus <= pciercx_cfg006.s.pbnum) && (dev != 0))
return 0;
pcie_addr.u64 = 0;
pcie_addr.config.upper = 2;
pcie_addr.config.io = 1;
pcie_addr.config.did = 3;
pcie_addr.config.subdid = 1;
pcie_addr.config.es = 1;
pcie_addr.config.port = pcie_port;
pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum);
pcie_addr.config.bus = bus;
pcie_addr.config.dev = dev;
pcie_addr.config.func = fn;
pcie_addr.config.reg = reg;
return pcie_addr.u64;
}
/**
* Read 8bits from a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
*
* Returns Result of the read
*/
static uint8_t cvmx_pcie_config_read8(int pcie_port, int bus, int dev,
int fn, int reg)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
return cvmx_read64_uint8(address);
else
return 0xff;
}
/**
* Read 16bits from a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
*
* Returns Result of the read
*/
static uint16_t cvmx_pcie_config_read16(int pcie_port, int bus, int dev,
int fn, int reg)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
return le16_to_cpu(cvmx_read64_uint16(address));
else
return 0xffff;
}
/**
* Read 32bits from a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
*
* Returns Result of the read
*/
static uint32_t cvmx_pcie_config_read32(int pcie_port, int bus, int dev,
int fn, int reg)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
return le32_to_cpu(cvmx_read64_uint32(address));
else
return 0xffffffff;
}
/**
* Write 8bits to a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
* @val: Value to write
*/
static void cvmx_pcie_config_write8(int pcie_port, int bus, int dev, int fn,
int reg, uint8_t val)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
cvmx_write64_uint8(address, val);
}
/**
* Write 16bits to a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
* @val: Value to write
*/
static void cvmx_pcie_config_write16(int pcie_port, int bus, int dev, int fn,
int reg, uint16_t val)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
cvmx_write64_uint16(address, cpu_to_le16(val));
}
/**
* Write 32bits to a Device's config space
*
* @pcie_port: PCIe port the device is on
* @bus: Sub bus
* @dev: Device ID
* @fn: Device sub function
* @reg: Register to access
* @val: Value to write
*/
static void cvmx_pcie_config_write32(int pcie_port, int bus, int dev, int fn,
int reg, uint32_t val)
{
uint64_t address =
__cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
if (address)
cvmx_write64_uint32(address, cpu_to_le32(val));
}
/**
* Initialize the RC config space CSRs
*
* @pcie_port: PCIe port to initialize
*/
static void __cvmx_pcie_rc_initialize_config_space(int pcie_port)
{
union cvmx_pciercx_cfg030 pciercx_cfg030;
union cvmx_npei_ctl_status2 npei_ctl_status2;
union cvmx_pciercx_cfg070 pciercx_cfg070;
union cvmx_pciercx_cfg001 pciercx_cfg001;
union cvmx_pciercx_cfg032 pciercx_cfg032;
union cvmx_pciercx_cfg006 pciercx_cfg006;
union cvmx_pciercx_cfg008 pciercx_cfg008;
union cvmx_pciercx_cfg009 pciercx_cfg009;
union cvmx_pciercx_cfg010 pciercx_cfg010;
union cvmx_pciercx_cfg011 pciercx_cfg011;
union cvmx_pciercx_cfg035 pciercx_cfg035;
union cvmx_pciercx_cfg075 pciercx_cfg075;
union cvmx_pciercx_cfg034 pciercx_cfg034;
/* Max Payload Size (PCIE*_CFG030[MPS]) */
/* Max Read Request Size (PCIE*_CFG030[MRRS]) */
/* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */
/* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */
pciercx_cfg030.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG030(pcie_port));
/*
* Max payload size = 128 bytes for best Octeon DMA
* performance.
*/
pciercx_cfg030.s.mps = 0;
/*
* Max read request size = 128 bytes for best Octeon DMA
* performance.
*/
pciercx_cfg030.s.mrrs = 0;
/* Enable relaxed ordering. */
pciercx_cfg030.s.ro_en = 1;
/* Enable no snoop. */
pciercx_cfg030.s.ns_en = 1;
/* Correctable error reporting enable. */
pciercx_cfg030.s.ce_en = 1;
/* Non-fatal error reporting enable. */
pciercx_cfg030.s.nfe_en = 1;
/* Fatal error reporting enable. */
pciercx_cfg030.s.fe_en = 1;
/* Unsupported request reporting enable. */
pciercx_cfg030.s.ur_en = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG030(pcie_port),
pciercx_cfg030.u32);
/*
* Max Payload Size (NPEI_CTL_STATUS2[MPS]) must match
* PCIE*_CFG030[MPS]
*
* Max Read Request Size (NPEI_CTL_STATUS2[MRRS]) must not
* exceed PCIE*_CFG030[MRRS].
*/
npei_ctl_status2.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS2);
/* Max payload size = 128 bytes for best Octeon DMA performance */
npei_ctl_status2.s.mps = 0;
/* Max read request size = 128 bytes for best Octeon DMA performance */
npei_ctl_status2.s.mrrs = 0;
if (pcie_port)
npei_ctl_status2.s.c1_b1_s = 3; /* Port1 BAR1 Size 256MB */
else
npei_ctl_status2.s.c0_b1_s = 3; /* Port0 BAR1 Size 256MB */
cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS2, npei_ctl_status2.u64);
/* ECRC Generation (PCIE*_CFG070[GE,CE]) */
pciercx_cfg070.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG070(pcie_port));
pciercx_cfg070.s.ge = 1; /* ECRC generation enable. */
pciercx_cfg070.s.ce = 1; /* ECRC check enable. */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG070(pcie_port),
pciercx_cfg070.u32);
/*
* Access Enables (PCIE*_CFG001[MSAE,ME]) ME and MSAE should
* always be set.
*
* Interrupt Disable (PCIE*_CFG001[I_DIS]) System Error
* Message Enable (PCIE*_CFG001[SEE])
*/
pciercx_cfg001.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG001(pcie_port));
pciercx_cfg001.s.msae = 1; /* Memory space enable. */
pciercx_cfg001.s.me = 1; /* Bus master enable. */
pciercx_cfg001.s.i_dis = 1; /* INTx assertion disable. */
pciercx_cfg001.s.see = 1; /* SERR# enable */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG001(pcie_port),
pciercx_cfg001.u32);
/* Advanced Error Recovery Message Enables */
/* (PCIE*_CFG066,PCIE*_CFG067,PCIE*_CFG069) */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG066(pcie_port), 0);
/* Use CVMX_PCIERCX_CFG067 hardware default */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG069(pcie_port), 0);
/* Active State Power Management (PCIE*_CFG032[ASLPC]) */
pciercx_cfg032.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
pciercx_cfg032.s.aslpc = 0; /* Active state Link PM control. */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG032(pcie_port),
pciercx_cfg032.u32);
/* Entrance Latencies (PCIE*_CFG451[L0EL,L1EL]) */
/*
* Link Width Mode (PCIERCn_CFG452[LME]) - Set during
* cvmx_pcie_rc_initialize_link()
*
* Primary Bus Number (PCIERCn_CFG006[PBNUM])
*
* We set the primary bus number to 1 so IDT bridges are
* happy. They don't like zero.
*/
pciercx_cfg006.u32 = 0;
pciercx_cfg006.s.pbnum = 1;
pciercx_cfg006.s.sbnum = 1;
pciercx_cfg006.s.subbnum = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG006(pcie_port),
pciercx_cfg006.u32);
/*
* Memory-mapped I/O BAR (PCIERCn_CFG008)
* Most applications should disable the memory-mapped I/O BAR by
* setting PCIERCn_CFG008[ML_ADDR] < PCIERCn_CFG008[MB_ADDR]
*/
pciercx_cfg008.u32 = 0;
pciercx_cfg008.s.mb_addr = 0x100;
pciercx_cfg008.s.ml_addr = 0;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG008(pcie_port),
pciercx_cfg008.u32);
/*
* Prefetchable BAR (PCIERCn_CFG009,PCIERCn_CFG010,PCIERCn_CFG011)
* Most applications should disable the prefetchable BAR by setting
* PCIERCn_CFG011[UMEM_LIMIT],PCIERCn_CFG009[LMEM_LIMIT] <
* PCIERCn_CFG010[UMEM_BASE],PCIERCn_CFG009[LMEM_BASE]
*/
pciercx_cfg009.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG009(pcie_port));
pciercx_cfg010.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG010(pcie_port));
pciercx_cfg011.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG011(pcie_port));
pciercx_cfg009.s.lmem_base = 0x100;
pciercx_cfg009.s.lmem_limit = 0;
pciercx_cfg010.s.umem_base = 0x100;
pciercx_cfg011.s.umem_limit = 0;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG009(pcie_port),
pciercx_cfg009.u32);
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG010(pcie_port),
pciercx_cfg010.u32);
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG011(pcie_port),
pciercx_cfg011.u32);
/*
* System Error Interrupt Enables (PCIERCn_CFG035[SECEE,SEFEE,SENFEE])
* PME Interrupt Enables (PCIERCn_CFG035[PMEIE])
*/
pciercx_cfg035.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG035(pcie_port));
/* System error on correctable error enable. */
pciercx_cfg035.s.secee = 1;
/* System error on fatal error enable. */
pciercx_cfg035.s.sefee = 1;
/* System error on non-fatal error enable. */
pciercx_cfg035.s.senfee = 1;
/* PME interrupt enable. */
pciercx_cfg035.s.pmeie = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG035(pcie_port),
pciercx_cfg035.u32);
/*
* Advanced Error Recovery Interrupt Enables
* (PCIERCn_CFG075[CERE,NFERE,FERE])
*/
pciercx_cfg075.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG075(pcie_port));
/* Correctable error reporting enable. */
pciercx_cfg075.s.cere = 1;
/* Non-fatal error reporting enable. */
pciercx_cfg075.s.nfere = 1;
/* Fatal error reporting enable. */
pciercx_cfg075.s.fere = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG075(pcie_port),
pciercx_cfg075.u32);
/* HP Interrupt Enables (PCIERCn_CFG034[HPINT_EN],
* PCIERCn_CFG034[DLLS_EN,CCINT_EN])
*/
pciercx_cfg034.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG034(pcie_port));
/* Hot-plug interrupt enable. */
pciercx_cfg034.s.hpint_en = 1;
/* Data Link Layer state changed enable */
pciercx_cfg034.s.dlls_en = 1;
/* Command completed interrupt enable. */
pciercx_cfg034.s.ccint_en = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG034(pcie_port),
pciercx_cfg034.u32);
}
/**
* Initialize a host mode PCIe link. This function takes a PCIe
* port from reset to a link up state. Software can then begin
* configuring the rest of the link.
*
* @pcie_port: PCIe port to initialize
*
* Returns Zero on success
*/
static int __cvmx_pcie_rc_initialize_link(int pcie_port)
{
uint64_t start_cycle;
union cvmx_pescx_ctl_status pescx_ctl_status;
union cvmx_pciercx_cfg452 pciercx_cfg452;
union cvmx_pciercx_cfg032 pciercx_cfg032;
union cvmx_pciercx_cfg448 pciercx_cfg448;
/* Set the lane width */
pciercx_cfg452.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG452(pcie_port));
pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
if (pescx_ctl_status.s.qlm_cfg == 0) {
/* We're in 8 lane (56XX) or 4 lane (54XX) mode */
pciercx_cfg452.s.lme = 0xf;
} else {
/* We're in 4 lane (56XX) or 2 lane (52XX) mode */
pciercx_cfg452.s.lme = 0x7;
}
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG452(pcie_port),
pciercx_cfg452.u32);
/*
* CN52XX pass 1.x has an errata where length mismatches on UR
* responses can cause bus errors on 64bit memory
* reads. Turning off length error checking fixes this.
*/
if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
union cvmx_pciercx_cfg455 pciercx_cfg455;
pciercx_cfg455.u32 =
cvmx_pcie_cfgx_read(pcie_port,
CVMX_PCIERCX_CFG455(pcie_port));
pciercx_cfg455.s.m_cpl_len_err = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG455(pcie_port),
pciercx_cfg455.u32);
}
/* Lane swap needs to be manually enabled for CN52XX */
if (OCTEON_IS_MODEL(OCTEON_CN52XX) && (pcie_port == 1)) {
pescx_ctl_status.s.lane_swp = 1;
cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port),
pescx_ctl_status.u64);
}
/* Bring up the link */
pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
pescx_ctl_status.s.lnk_enb = 1;
cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
/*
* CN52XX pass 1.0: Due to a bug in 2nd order CDR, it needs to
* be disabled.
*/
if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_0))
__cvmx_helper_errata_qlm_disable_2nd_order_cdr(0);
/* Wait for the link to come up */
cvmx_dprintf("PCIe: Waiting for port %d link\n", pcie_port);
start_cycle = cvmx_get_cycle();
do {
if (cvmx_get_cycle() - start_cycle >
2 * cvmx_sysinfo_get()->cpu_clock_hz) {
cvmx_dprintf("PCIe: Port %d link timeout\n",
pcie_port);
return -1;
}
cvmx_wait(10000);
pciercx_cfg032.u32 =
cvmx_pcie_cfgx_read(pcie_port,
CVMX_PCIERCX_CFG032(pcie_port));
} while (pciercx_cfg032.s.dlla == 0);
/* Display the link status */
cvmx_dprintf("PCIe: Port %d link active, %d lanes\n", pcie_port,
pciercx_cfg032.s.nlw);
/*
* Update the Replay Time Limit. Empirically, some PCIe
* devices take a little longer to respond than expected under
* load. As a workaround for this we configure the Replay Time
* Limit to the value expected for a 512 byte MPS instead of
* our actual 256 byte MPS. The numbers below are directly
* from the PCIe spec table 3-4.
*/
pciercx_cfg448.u32 =
cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
switch (pciercx_cfg032.s.nlw) {
case 1: /* 1 lane */
pciercx_cfg448.s.rtl = 1677;
break;
case 2: /* 2 lanes */
pciercx_cfg448.s.rtl = 867;
break;
case 4: /* 4 lanes */
pciercx_cfg448.s.rtl = 462;
break;
case 8: /* 8 lanes */
pciercx_cfg448.s.rtl = 258;
break;
}
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port),
pciercx_cfg448.u32);
return 0;
}
/**
* Initialize a PCIe port for use in host(RC) mode. It doesn't
* enumerate the bus.
*
* @pcie_port: PCIe port to initialize
*
* Returns Zero on success
*/
static int cvmx_pcie_rc_initialize(int pcie_port)
{
int i;
int base;
u64 addr_swizzle;
union cvmx_ciu_soft_prst ciu_soft_prst;
union cvmx_pescx_bist_status pescx_bist_status;
union cvmx_pescx_bist_status2 pescx_bist_status2;
union cvmx_npei_ctl_status npei_ctl_status;
union cvmx_npei_mem_access_ctl npei_mem_access_ctl;
union cvmx_npei_mem_access_subidx mem_access_subid;
union cvmx_npei_dbg_data npei_dbg_data;
union cvmx_pescx_ctl_status2 pescx_ctl_status2;
union cvmx_npei_bar1_indexx bar1_index;
/*
* Make sure we aren't trying to setup a target mode interface
* in host mode.
*/
npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
if ((pcie_port == 0) && !npei_ctl_status.s.host_mode) {
cvmx_dprintf("PCIe: ERROR: cvmx_pcie_rc_initialize() called "
"on port0, but port0 is not in host mode\n");
return -1;
}
/*
* Make sure a CN52XX isn't trying to bring up port 1 when it
* is disabled.
*/
if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
if ((pcie_port == 1) && npei_dbg_data.cn52xx.qlm0_link_width) {
cvmx_dprintf("PCIe: ERROR: cvmx_pcie_rc_initialize() "
"called on port1, but port1 is "
"disabled\n");
return -1;
}
}
/*
* PCIe switch arbitration mode. '0' == fixed priority NPEI,
* PCIe0, then PCIe1. '1' == round robin.
*/
npei_ctl_status.s.arb = 1;
/* Allow up to 0x20 config retries */
npei_ctl_status.s.cfg_rtry = 0x20;
/*
* CN52XX pass1.x has an errata where P0_NTAGS and P1_NTAGS
* don't reset.
*/
if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
npei_ctl_status.s.p0_ntags = 0x20;
npei_ctl_status.s.p1_ntags = 0x20;
}
cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS, npei_ctl_status.u64);
/* Bring the PCIe out of reset */
if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) {
/*
* The EBH5200 board swapped the PCIe reset lines on
* the board. As a workaround for this bug, we bring
* both PCIe ports out of reset at the same time
* instead of on separate calls. So for port 0, we
* bring both out of reset and do nothing on port 1.
*/
if (pcie_port == 0) {
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
/*
* After a chip reset the PCIe will also be in
* reset. If it isn't, most likely someone is
* trying to init it again without a proper
* PCIe reset.
*/
if (ciu_soft_prst.s.soft_prst == 0) {
/* Reset the ports */
ciu_soft_prst.s.soft_prst = 1;
cvmx_write_csr(CVMX_CIU_SOFT_PRST,
ciu_soft_prst.u64);
ciu_soft_prst.u64 =
cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
ciu_soft_prst.s.soft_prst = 1;
cvmx_write_csr(CVMX_CIU_SOFT_PRST1,
ciu_soft_prst.u64);
/* Wait until pcie resets the ports. */
udelay(2000);
}
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
ciu_soft_prst.s.soft_prst = 0;
cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
ciu_soft_prst.s.soft_prst = 0;
cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
}
} else {
/*
* The normal case: The PCIe ports are completely
* separate and can be brought out of reset
* independently.
*/
if (pcie_port)
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
else
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
/*
* After a chip reset the PCIe will also be in
* reset. If it isn't, most likely someone is trying
* to init it again without a proper PCIe reset.
*/
if (ciu_soft_prst.s.soft_prst == 0) {
/* Reset the port */
ciu_soft_prst.s.soft_prst = 1;
if (pcie_port)
cvmx_write_csr(CVMX_CIU_SOFT_PRST1,
ciu_soft_prst.u64);
else
cvmx_write_csr(CVMX_CIU_SOFT_PRST,
ciu_soft_prst.u64);
/* Wait until pcie resets the ports. */
udelay(2000);
}
if (pcie_port) {
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
ciu_soft_prst.s.soft_prst = 0;
cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
} else {
ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
ciu_soft_prst.s.soft_prst = 0;
cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
}
}
/*
* Wait for PCIe reset to complete. Due to errata PCIE-700, we
* don't poll PESCX_CTL_STATUS2[PCIERST], but simply wait a
* fixed number of cycles.
*/
cvmx_wait(400000);
/* PESCX_BIST_STATUS2[PCLK_RUN] was missing on pass 1 of CN56XX and
CN52XX, so we only probe it on newer chips */
if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)
&& !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
/* Clear PCLK_RUN so we can check if the clock is running */
pescx_ctl_status2.u64 =
cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
pescx_ctl_status2.s.pclk_run = 1;
cvmx_write_csr(CVMX_PESCX_CTL_STATUS2(pcie_port),
pescx_ctl_status2.u64);
/*
* Now that we cleared PCLK_RUN, wait for it to be set
* again telling us the clock is running.
*/
if (CVMX_WAIT_FOR_FIELD64(CVMX_PESCX_CTL_STATUS2(pcie_port),
union cvmx_pescx_ctl_status2,
pclk_run, ==, 1, 10000)) {
cvmx_dprintf("PCIe: Port %d isn't clocked, skipping.\n",
pcie_port);
return -1;
}
}
/*
* Check and make sure PCIe came out of reset. If it doesn't
* the board probably hasn't wired the clocks up and the
* interface should be skipped.
*/
pescx_ctl_status2.u64 =
cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
if (pescx_ctl_status2.s.pcierst) {
cvmx_dprintf("PCIe: Port %d stuck in reset, skipping.\n",
pcie_port);
return -1;
}
/*
* Check BIST2 status. If any bits are set skip this interface. This
* is an attempt to catch PCIE-813 on pass 1 parts.
*/
pescx_bist_status2.u64 =
cvmx_read_csr(CVMX_PESCX_BIST_STATUS2(pcie_port));
if (pescx_bist_status2.u64) {
cvmx_dprintf("PCIe: Port %d BIST2 failed. Most likely this "
"port isn't hooked up, skipping.\n",
pcie_port);
return -1;
}
/* Check BIST status */
pescx_bist_status.u64 =
cvmx_read_csr(CVMX_PESCX_BIST_STATUS(pcie_port));
if (pescx_bist_status.u64)
cvmx_dprintf("PCIe: BIST FAILED for port %d (0x%016llx)\n",
pcie_port, CAST64(pescx_bist_status.u64));
/* Initialize the config space CSRs */
__cvmx_pcie_rc_initialize_config_space(pcie_port);
/* Bring the link up */
if (__cvmx_pcie_rc_initialize_link(pcie_port)) {
cvmx_dprintf
("PCIe: ERROR: cvmx_pcie_rc_initialize_link() failed\n");
return -1;
}
/* Store merge control (NPEI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
npei_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL);
/* Allow 16 words to combine */
npei_mem_access_ctl.s.max_word = 0;
/* Wait up to 127 cycles for more data */
npei_mem_access_ctl.s.timer = 127;
cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL, npei_mem_access_ctl.u64);
/* Setup Mem access SubDIDs */
mem_access_subid.u64 = 0;
/* Port the request is sent to. */
mem_access_subid.s.port = pcie_port;
/* Due to an errata on pass 1 chips, no merging is allowed. */
mem_access_subid.s.nmerge = 1;
/* Endian-swap for Reads. */
mem_access_subid.s.esr = 1;
/* Endian-swap for Writes. */
mem_access_subid.s.esw = 1;
/* No Snoop for Reads. */
mem_access_subid.s.nsr = 1;
/* No Snoop for Writes. */
mem_access_subid.s.nsw = 1;
/* Disable Relaxed Ordering for Reads. */
mem_access_subid.s.ror = 0;
/* Disable Relaxed Ordering for Writes. */
mem_access_subid.s.row = 0;
/* PCIe Adddress Bits <63:34>. */
mem_access_subid.s.ba = 0;
/*
* Setup mem access 12-15 for port 0, 16-19 for port 1,
* supplying 36 bits of address space.
*/
for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_SUBIDX(i),
mem_access_subid.u64);
/* Set each SUBID to extend the addressable range */
mem_access_subid.s.ba += 1;
}
/*
* Disable the peer to peer forwarding register. This must be
* setup by the OS after it enumerates the bus and assigns
* addresses to the PCIe busses.
*/
for (i = 0; i < 4; i++) {
cvmx_write_csr(CVMX_PESCX_P2P_BARX_START(i, pcie_port), -1);
cvmx_write_csr(CVMX_PESCX_P2P_BARX_END(i, pcie_port), -1);
}
/* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
cvmx_write_csr(CVMX_PESCX_P2N_BAR0_START(pcie_port), 0);
/* BAR1 follows BAR2 with a gap. */
cvmx_write_csr(CVMX_PESCX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
bar1_index.u32 = 0;
bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
bar1_index.s.ca = 1; /* Not Cached */
bar1_index.s.end_swp = 1; /* Endian Swap mode */
bar1_index.s.addr_v = 1; /* Valid entry */
base = pcie_port ? 16 : 0;
/* Big endian swizzle for 32-bit PEXP_NCB register. */
#ifdef __MIPSEB__
addr_swizzle = 4;
#else
addr_swizzle = 0;
#endif
for (i = 0; i < 16; i++) {
cvmx_write64_uint32((CVMX_PEXP_NPEI_BAR1_INDEXX(base) ^ addr_swizzle),
bar1_index.u32);
base++;
/* 256MB / 16 >> 22 == 4 */
bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
}
/*
* Set Octeon's BAR2 to decode 0-2^39. Bar0 and Bar1 take
* precedence where they overlap. It also overlaps with the
* device addresses, so make sure the peer to peer forwarding
* is set right.
*/
cvmx_write_csr(CVMX_PESCX_P2N_BAR2_START(pcie_port), 0);
/*
* Setup BAR2 attributes
*
* Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
* - PTLP_RO,CTLP_RO should normally be set (except for debug).
* - WAIT_COM=0 will likely work for all applications.
*
* Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM]).
*/
if (pcie_port) {
union cvmx_npei_ctl_port1 npei_ctl_port;
npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT1);
npei_ctl_port.s.bar2_enb = 1;
npei_ctl_port.s.bar2_esx = 1;
npei_ctl_port.s.bar2_cax = 0;
npei_ctl_port.s.ptlp_ro = 1;
npei_ctl_port.s.ctlp_ro = 1;
npei_ctl_port.s.wait_com = 0;
npei_ctl_port.s.waitl_com = 0;
cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT1, npei_ctl_port.u64);
} else {
union cvmx_npei_ctl_port0 npei_ctl_port;
npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT0);
npei_ctl_port.s.bar2_enb = 1;
npei_ctl_port.s.bar2_esx = 1;
npei_ctl_port.s.bar2_cax = 0;
npei_ctl_port.s.ptlp_ro = 1;
npei_ctl_port.s.ctlp_ro = 1;
npei_ctl_port.s.wait_com = 0;
npei_ctl_port.s.waitl_com = 0;
cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT0, npei_ctl_port.u64);
}
return 0;
}
/* Above was cvmx-pcie.c, below original pcie.c */
/**
* 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_pcie_pcibios_map_irq(const struct pci_dev *dev,
u8 slot, u8 pin)
{
/*
* The EBH5600 board with the PCI to PCIe bridge mistakenly
* wires the first slot for both device id 2 and interrupt
* A. According to the PCI spec, device id 2 should be C. The
* following kludge attempts to fix this.
*/
if (strstr(octeon_board_type_string(), "EBH5600") &&
dev->bus && dev->bus->parent) {
/*
* Iterate all the way up the device chain and find
* the root bus.
*/
while (dev->bus && dev->bus->parent)
dev = to_pci_dev(dev->bus->bridge);
/* If the root bus is number 0 and the PEX 8114 is the
* root, assume we are behind the miswired bus. We
* need to correct the swizzle level by two. Yuck.
*/
if ((dev->bus->number == 0) &&
(dev->vendor == 0x10b5) && (dev->device == 0x8114)) {
/*
* The pin field is one based, not zero. We
* need to swizzle it by minus two.
*/
pin = ((pin - 3) & 3) + 1;
}
}
/*
* The -1 is because pin starts with one, not zero. It might
* be that this equation needs to include the slot number, but
* I don't have hardware to check that against.
*/
return pin - 1 + OCTEON_IRQ_PCI_INT0;
}
/**
* Read a value from configuration space
*
* @bus:
* @devfn:
* @reg:
* @size:
* @val:
* Returns
*/
static inline int octeon_pcie_read_config(int pcie_port, struct pci_bus *bus,
unsigned int devfn, int reg, int size,
u32 *val)
{
union octeon_cvmemctl cvmmemctl;
union octeon_cvmemctl cvmmemctl_save;
int bus_number = bus->number;
/*
* For the top level bus make sure our hardware bus number
* matches the software one.
*/
if (bus->parent == NULL) {
union cvmx_pciercx_cfg006 pciercx_cfg006;
pciercx_cfg006.u32 = cvmx_pcie_cfgx_read(pcie_port,
CVMX_PCIERCX_CFG006(pcie_port));
if (pciercx_cfg006.s.pbnum != bus_number) {
pciercx_cfg006.s.pbnum = bus_number;
pciercx_cfg006.s.sbnum = bus_number;
pciercx_cfg006.s.subbnum = bus_number;
cvmx_pcie_cfgx_write(pcie_port,
CVMX_PCIERCX_CFG006(pcie_port),
pciercx_cfg006.u32);
}
}
/*
* PCIe only has a single device connected to Octeon. It is
* always device ID 0. Don't bother doing reads for other
* device IDs on the first segment.
*/
if ((bus->parent == NULL) && (devfn >> 3 != 0))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/*
* The following is a workaround for the CN57XX, CN56XX,
* CN55XX, and CN54XX errata with PCIe config reads from non
* existent devices. These chips will hang the PCIe link if a
* config read is performed that causes a UR response.
*/
if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1)) {
/*
* For our EBH5600 board, port 0 has a bridge with two
* PCI-X slots. We need a new special checks to make
* sure we only probe valid stuff. The PCIe->PCI-X
* bridge only respondes to device ID 0, function
* 0-1
*/
if ((bus->parent == NULL) && (devfn >= 2))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/*
* The PCI-X slots are device ID 2,3. Choose one of
* the below "if" blocks based on what is plugged into
* the board.
*/
#if 1
/* Use this option if you aren't using either slot */
if (bus_number == 1)
return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
/*
* Use this option if you are using the first slot but
* not the second.
*/
if ((bus_number == 1) && (devfn >> 3 != 2))
return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
/*
* Use this option if you are using the second slot
* but not the first.
*/
if ((bus_number == 1) && (devfn >> 3 != 3))
return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
/* Use this opion if you are using both slots */
if ((bus_number == 1) &&
!((devfn == (2 << 3)) || (devfn == (3 << 3))))
return PCIBIOS_FUNC_NOT_SUPPORTED;
#endif
/*
* Shorten the DID timeout so bus errors for PCIe
* config reads from non existent devices happen
* faster. This allows us to continue booting even if
* the above "if" checks are wrong. Once one of these
* errors happens, the PCIe port is dead.
*/
cvmmemctl_save.u64 = __read_64bit_c0_register($11, 7);
cvmmemctl.u64 = cvmmemctl_save.u64;
cvmmemctl.s.didtto = 2;
__write_64bit_c0_register($11, 7, cvmmemctl.u64);
}
switch (size) {
case 4:
*val = cvmx_pcie_config_read32(pcie_port, bus_number,
devfn >> 3, devfn & 0x7, reg);
break;
case 2:
*val = cvmx_pcie_config_read16(pcie_port, bus_number,
devfn >> 3, devfn & 0x7, reg);
break;
case 1:
*val = cvmx_pcie_config_read8(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg);
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
__write_64bit_c0_register($11, 7, cvmmemctl_save.u64);
return PCIBIOS_SUCCESSFUL;
}
static int octeon_pcie0_read_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 *val)
{
return octeon_pcie_read_config(0, bus, devfn, reg, size, val);
}
static int octeon_pcie1_read_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 *val)
{
return octeon_pcie_read_config(1, bus, devfn, reg, size, val);
}
/**
* Write a value to PCI configuration space
*
* @bus:
* @devfn:
* @reg:
* @size:
* @val:
* Returns
*/
static inline int octeon_pcie_write_config(int pcie_port, struct pci_bus *bus,
unsigned int devfn, int reg,
int size, u32 val)
{
int bus_number = bus->number;
switch (size) {
case 4:
cvmx_pcie_config_write32(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
return PCIBIOS_SUCCESSFUL;
case 2:
cvmx_pcie_config_write16(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
return PCIBIOS_SUCCESSFUL;
case 1:
cvmx_pcie_config_write8(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
return PCIBIOS_SUCCESSFUL;
}
#if PCI_CONFIG_SPACE_DELAY
udelay(PCI_CONFIG_SPACE_DELAY);
#endif
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
static int octeon_pcie0_write_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 val)
{
return octeon_pcie_write_config(0, bus, devfn, reg, size, val);
}
static int octeon_pcie1_write_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 val)
{
return octeon_pcie_write_config(1, bus, devfn, reg, size, val);
}
static struct pci_ops octeon_pcie0_ops = {
octeon_pcie0_read_config,
octeon_pcie0_write_config,
};
static struct resource octeon_pcie0_mem_resource = {
.name = "Octeon PCIe0 MEM",
.flags = IORESOURCE_MEM,
};
static struct resource octeon_pcie0_io_resource = {
.name = "Octeon PCIe0 IO",
.flags = IORESOURCE_IO,
};
static struct pci_controller octeon_pcie0_controller = {
.pci_ops = &octeon_pcie0_ops,
.mem_resource = &octeon_pcie0_mem_resource,
.io_resource = &octeon_pcie0_io_resource,
};
static struct pci_ops octeon_pcie1_ops = {
octeon_pcie1_read_config,
octeon_pcie1_write_config,
};
static struct resource octeon_pcie1_mem_resource = {
.name = "Octeon PCIe1 MEM",
.flags = IORESOURCE_MEM,
};
static struct resource octeon_pcie1_io_resource = {
.name = "Octeon PCIe1 IO",
.flags = IORESOURCE_IO,
};
static struct pci_controller octeon_pcie1_controller = {
.pci_ops = &octeon_pcie1_ops,
.mem_resource = &octeon_pcie1_mem_resource,
.io_resource = &octeon_pcie1_io_resource,
};
/**
* Initialize the Octeon PCIe controllers
*
* Returns
*/
static int __init octeon_pcie_setup(void)
{
union cvmx_npei_ctl_status npei_ctl_status;
int result;
/* These chips don't have PCIe */
if (!octeon_has_feature(OCTEON_FEATURE_PCIE))
return 0;
/* Point pcibios_map_irq() to the PCIe version of it */
octeon_pcibios_map_irq = octeon_pcie_pcibios_map_irq;
/* Use the PCIe based DMA mappings */
octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE;
/*
* PCIe I/O range. It is based on port 0 but includes up until
* port 1's end.
*/
set_io_port_base(CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0)));
ioport_resource.start = 0;
ioport_resource.end =
cvmx_pcie_get_io_base_address(1) -
cvmx_pcie_get_io_base_address(0) + cvmx_pcie_get_io_size(1) - 1;
npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
if (npei_ctl_status.s.host_mode) {
pr_notice("PCIe: Initializing port 0\n");
result = cvmx_pcie_rc_initialize(0);
if (result == 0) {
/* Memory offsets are physical addresses */
octeon_pcie0_controller.mem_offset =
cvmx_pcie_get_mem_base_address(0);
/* IO offsets are Mips virtual addresses */
octeon_pcie0_controller.io_map_base =
CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address
(0));
octeon_pcie0_controller.io_offset = 0;
/*
* To keep things similar to PCI, we start
* device addresses at the same place as PCI
* uisng big bar support. This normally
* translates to 4GB-256MB, which is the same
* as most x86 PCs.
*/
octeon_pcie0_controller.mem_resource->start =
cvmx_pcie_get_mem_base_address(0) +
(4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
octeon_pcie0_controller.mem_resource->end =
cvmx_pcie_get_mem_base_address(0) +
cvmx_pcie_get_mem_size(0) - 1;
/*
* Ports must be above 16KB for the ISA bus
* filtering in the PCI-X to PCI bridge.
*/
octeon_pcie0_controller.io_resource->start = 4 << 10;
octeon_pcie0_controller.io_resource->end =
cvmx_pcie_get_io_size(0) - 1;
register_pci_controller(&octeon_pcie0_controller);
}
} else {
pr_notice("PCIe: Port 0 in endpoint mode, skipping.\n");
}
/* Skip the 2nd port on CN52XX if port 0 is in 4 lane mode */
if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
union cvmx_npei_dbg_data npei_dbg_data;
npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
if (npei_dbg_data.cn52xx.qlm0_link_width)
return 0;
}
pr_notice("PCIe: Initializing port 1\n");
result = cvmx_pcie_rc_initialize(1);
if (result == 0) {
/* Memory offsets are physical addresses */
octeon_pcie1_controller.mem_offset =
cvmx_pcie_get_mem_base_address(1);
/* IO offsets are Mips virtual addresses */
octeon_pcie1_controller.io_map_base =
CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(1));
octeon_pcie1_controller.io_offset =
cvmx_pcie_get_io_base_address(1) -
cvmx_pcie_get_io_base_address(0);
/*
* To keep things similar to PCI, we start device
* addresses at the same place as PCI uisng big bar
* support. This normally translates to 4GB-256MB,
* which is the same as most x86 PCs.
*/
octeon_pcie1_controller.mem_resource->start =
cvmx_pcie_get_mem_base_address(1) + (4ul << 30) -
(OCTEON_PCI_BAR1_HOLE_SIZE << 20);
octeon_pcie1_controller.mem_resource->end =
cvmx_pcie_get_mem_base_address(1) +
cvmx_pcie_get_mem_size(1) - 1;
/*
* Ports must be above 16KB for the ISA bus filtering
* in the PCI-X to PCI bridge.
*/
octeon_pcie1_controller.io_resource->start =
cvmx_pcie_get_io_base_address(1) -
cvmx_pcie_get_io_base_address(0);
octeon_pcie1_controller.io_resource->end =
octeon_pcie1_controller.io_resource->start +
cvmx_pcie_get_io_size(1) - 1;
register_pci_controller(&octeon_pcie1_controller);
}
return 0;
}
arch_initcall(octeon_pcie_setup);
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