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linux-pinenote/arch/mips/pci/pcie-octeon.c
Alexander Sverdlin 73bf3c2a50 MIPS: Octeon: Remove udelay() causing huge IRQ latency 
udelay() in PCI/PCIe read/write callbacks cause 30ms IRQ latency on Octeon
platforms because these operations are called from PCI_OP_READ() and
PCI_OP_WRITE() under raw_spin_lock_irqsave().

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: linux-mips@linux-mips.org
Cc: David Daney <ddaney@cavium.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Mathias <mathias.rulf@nokia.com>
Patchwork: https://patchwork.linux-mips.org/patch/9576/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-10 15:41:42 +02:00

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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, 2009, 2010, 2011 Cavium Networks
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/module.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-pemx-defs.h>
#include <asm/octeon/cvmx-dpi-defs.h>
#include <asm/octeon/cvmx-sli-defs.h>
#include <asm/octeon/cvmx-sriox-defs.h>
#include <asm/octeon/cvmx-helper-errata.h>
#include <asm/octeon/pci-octeon.h>
#define MRRS_CN5XXX 0 /* 128 byte Max Read Request Size */
#define MPS_CN5XXX 0 /* 128 byte Max Packet Size (Limit of most PCs) */
#define MRRS_CN6XXX 3 /* 1024 byte Max Read Request Size */
#define MPS_CN6XXX 0 /* 128 byte Max Packet Size (Limit of most PCs) */
/* Module parameter to disable PCI probing */
static int pcie_disable;
module_param(pcie_disable, int, S_IRUGO);
static int enable_pcie_14459_war;
static int enable_pcie_bus_num_war[2];
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;
};
static int cvmx_pcie_rc_initialize(int pcie_port);
#include <dma-coherence.h>
/**
* 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)
{
if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
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;
} else {
union cvmx_pemx_cfg_rd pemx_cfg_rd;
pemx_cfg_rd.u64 = 0;
pemx_cfg_rd.s.addr = cfg_offset;
cvmx_write_csr(CVMX_PEMX_CFG_RD(pcie_port), pemx_cfg_rd.u64);
pemx_cfg_rd.u64 = cvmx_read_csr(CVMX_PEMX_CFG_RD(pcie_port));
return pemx_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)
{
if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
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);
} else {
union cvmx_pemx_cfg_wr pemx_cfg_wr;
pemx_cfg_wr.u64 = 0;
pemx_cfg_wr.s.addr = cfg_offset;
pemx_cfg_wr.s.data = val;
cvmx_write_csr(CVMX_PEMX_CFG_WR(pcie_port), pemx_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_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));
if (OCTEON_IS_MODEL(OCTEON_CN5XXX)) {
pciercx_cfg030.s.mps = MPS_CN5XXX;
pciercx_cfg030.s.mrrs = MRRS_CN5XXX;
} else {
pciercx_cfg030.s.mps = MPS_CN6XXX;
pciercx_cfg030.s.mrrs = MRRS_CN6XXX;
}
/*
* Enable relaxed order processing. This will allow devices to
* affect read response ordering.
*/
pciercx_cfg030.s.ro_en = 1;
/* Enable no snoop processing. Not used by Octeon */
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);
if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
union cvmx_npei_ctl_status2 npei_ctl_status2;
/*
* 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 = MPS_CN5XXX;
/* Max read request size = 128 bytes for best Octeon DMA performance */
npei_ctl_status2.s.mrrs = MRRS_CN5XXX;
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);
} else {
/*
* Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match
* PCIE*_CFG030[MPS]. Max Read Request Size
* (DPI_SLI_PRTX_CFG[MRRS]) must not exceed
* PCIE*_CFG030[MRRS].
*/
union cvmx_dpi_sli_prtx_cfg prt_cfg;
union cvmx_sli_s2m_portx_ctl sli_s2m_portx_ctl;
prt_cfg.u64 = cvmx_read_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port));
prt_cfg.s.mps = MPS_CN6XXX;
prt_cfg.s.mrrs = MRRS_CN6XXX;
/* Max outstanding load request. */
prt_cfg.s.molr = 32;
cvmx_write_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64);
sli_s2m_portx_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port));
sli_s2m_portx_ctl.s.mrrs = MRRS_CN6XXX;
cvmx_write_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.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);
/*
* 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));
pciercx_cfg035.s.secee = 1; /* System error on correctable error enable. */
pciercx_cfg035.s.sefee = 1; /* System error on fatal error enable. */
pciercx_cfg035.s.senfee = 1; /* System error on non-fatal error enable. */
pciercx_cfg035.s.pmeie = 1; /* PME interrupt enable. */
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));
pciercx_cfg075.s.cere = 1; /* Correctable error reporting enable. */
pciercx_cfg075.s.nfere = 1; /* Non-fatal error reporting enable. */
pciercx_cfg075.s.fere = 1; /* Fatal error reporting enable. */
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));
pciercx_cfg034.s.hpint_en = 1; /* Hot-plug interrupt enable. */
pciercx_cfg034.s.dlls_en = 1; /* Data Link Layer state changed enable */
pciercx_cfg034.s.ccint_en = 1; /* Command completed interrupt enable. */
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG034(pcie_port), pciercx_cfg034.u32);
}
/**
* Initialize a host mode PCIe gen 1 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_gen1(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 */
start_cycle = cvmx_get_cycle();
do {
if (cvmx_get_cycle() - start_cycle > 2 * octeon_get_clock_rate()) {
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);
/* Clear all pending errors */
cvmx_write_csr(CVMX_PEXP_NPEI_INT_SUM, cvmx_read_csr(CVMX_PEXP_NPEI_INT_SUM));
/*
* 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;
}
static void __cvmx_increment_ba(union cvmx_sli_mem_access_subidx *pmas)
{
if (OCTEON_IS_MODEL(OCTEON_CN68XX))
pmas->cn68xx.ba++;
else
pmas->cn63xx.ba++;
}
/**
* Initialize a PCIe gen 1 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_gen1(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_pciercx_cfg032 pciercx_cfg032;
union cvmx_npei_bar1_indexx bar1_index;
retry:
/*
* 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: Port %d in endpoint mode\n", pcie_port);
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_gen1(pcie_port)) {
cvmx_dprintf("PCIe: Failed to initialize port %d, probably the slot is empty\n",
pcie_port);
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);
npei_mem_access_ctl.s.max_word = 0; /* Allow 16 words to combine */
npei_mem_access_ctl.s.timer = 127; /* Wait up to 127 cycles for more data */
cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL, npei_mem_access_ctl.u64);
/* Setup Mem access SubDIDs */
mem_access_subid.u64 = 0;
mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
mem_access_subid.s.nmerge = 1; /* Due to an errata on pass 1 chips, no merging is allowed. */
mem_access_subid.s.esr = 1; /* Endian-swap for Reads. */
mem_access_subid.s.esw = 1; /* Endian-swap for Writes. */
mem_access_subid.s.nsr = 0; /* Enable Snooping for Reads. Octeon doesn't care, but devices might want this more conservative setting */
mem_access_subid.s.nsw = 0; /* Enable Snoop for Writes. */
mem_access_subid.s.ror = 0; /* Disable Relaxed Ordering for Reads. */
mem_access_subid.s.row = 0; /* Disable Relaxed Ordering for Writes. */
mem_access_subid.s.ba = 0; /* PCIe Adddress Bits <63:34>. */
/*
* 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);
mem_access_subid.s.ba += 1; /* Set each SUBID to extend the addressable range */
}
/*
* 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 so it has the same address as for gen2. */
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);
}
/*
* Both pass 1 and pass 2 of CN52XX and CN56XX have an errata
* that causes TLP ordering to not be preserved after multiple
* PCIe port resets. This code detects this fault and corrects
* it by aligning the TLP counters properly. Another link
* reset is then performed. See PCIE-13340
*/
if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) ||
OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X) ||
OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
union cvmx_npei_dbg_data dbg_data;
int old_in_fif_p_count;
int in_fif_p_count;
int out_p_count;
int in_p_offset = (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X) || OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) ? 4 : 1;
int i;
/*
* Choose a write address of 1MB. It should be
* harmless as all bars haven't been setup.
*/
uint64_t write_address = (cvmx_pcie_get_mem_base_address(pcie_port) + 0x100000) | (1ull<<63);
/*
* Make sure at least in_p_offset have been executed before we try and
* read in_fif_p_count
*/
i = in_p_offset;
while (i--) {
cvmx_write64_uint32(write_address, 0);
cvmx_wait(10000);
}
/*
* Read the IN_FIF_P_COUNT from the debug
* select. IN_FIF_P_COUNT can be unstable sometimes so
* read it twice with a write between the reads. This
* way we can tell the value is good as it will
* increment by one due to the write
*/
cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd7fc : 0xcffc);
cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
do {
dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
old_in_fif_p_count = dbg_data.s.data & 0xff;
cvmx_write64_uint32(write_address, 0);
cvmx_wait(10000);
dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
in_fif_p_count = dbg_data.s.data & 0xff;
} while (in_fif_p_count != ((old_in_fif_p_count+1) & 0xff));
/* Update in_fif_p_count for it's offset with respect to out_p_count */
in_fif_p_count = (in_fif_p_count + in_p_offset) & 0xff;
/* Read the OUT_P_COUNT from the debug select */
cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd00f : 0xc80f);
cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
out_p_count = (dbg_data.s.data>>1) & 0xff;
/* Check that the two counters are aligned */
if (out_p_count != in_fif_p_count) {
cvmx_dprintf("PCIe: Port %d aligning TLP counters as workaround to maintain ordering\n", pcie_port);
while (in_fif_p_count != 0) {
cvmx_write64_uint32(write_address, 0);
cvmx_wait(10000);
in_fif_p_count = (in_fif_p_count + 1) & 0xff;
}
/*
* The EBH5200 board swapped the PCIe reset
* lines on the board. This means we must
* bring both links down and up, which will
* cause the PCIe0 to need alignment
* again. Lots of messages will be displayed,
* but everything should work
*/
if ((cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) &&
(pcie_port == 1))
cvmx_pcie_rc_initialize(0);
/* Rety bringing this port up */
goto retry;
}
}
/* Display the link status */
pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
cvmx_dprintf("PCIe: Port %d link active, %d lanes\n", pcie_port, pciercx_cfg032.s.nlw);
return 0;
}
/**
* Initialize a host mode PCIe gen 2 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
*
* Return Zero on success.
*/
static int __cvmx_pcie_rc_initialize_link_gen2(int pcie_port)
{
uint64_t start_cycle;
union cvmx_pemx_ctl_status pem_ctl_status;
union cvmx_pciercx_cfg032 pciercx_cfg032;
union cvmx_pciercx_cfg448 pciercx_cfg448;
/* Bring up the link */
pem_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
pem_ctl_status.s.lnk_enb = 1;
cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64);
/* Wait for the link to come up */
start_cycle = cvmx_get_cycle();
do {
if (cvmx_get_cycle() - start_cycle > octeon_get_clock_rate())
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) || (pciercx_cfg032.s.lt == 1));
/*
* 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 gen 2 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_gen2(int pcie_port)
{
int i;
union cvmx_ciu_soft_prst ciu_soft_prst;
union cvmx_mio_rst_ctlx mio_rst_ctl;
union cvmx_pemx_bar_ctl pemx_bar_ctl;
union cvmx_pemx_ctl_status pemx_ctl_status;
union cvmx_pemx_bist_status pemx_bist_status;
union cvmx_pemx_bist_status2 pemx_bist_status2;
union cvmx_pciercx_cfg032 pciercx_cfg032;
union cvmx_pciercx_cfg515 pciercx_cfg515;
union cvmx_sli_ctl_portx sli_ctl_portx;
union cvmx_sli_mem_access_ctl sli_mem_access_ctl;
union cvmx_sli_mem_access_subidx mem_access_subid;
union cvmx_sriox_status_reg sriox_status_reg;
union cvmx_pemx_bar1_indexx bar1_index;
if (octeon_has_feature(OCTEON_FEATURE_SRIO)) {
/* Make sure this interface isn't SRIO */
if (OCTEON_IS_MODEL(OCTEON_CN66XX)) {
/*
* The CN66XX requires reading the
* MIO_QLMX_CFG register to figure out the
* port type.
*/
union cvmx_mio_qlmx_cfg qlmx_cfg;
qlmx_cfg.u64 = cvmx_read_csr(CVMX_MIO_QLMX_CFG(pcie_port));
if (qlmx_cfg.s.qlm_spd == 15) {
pr_notice("PCIe: Port %d is disabled, skipping.\n", pcie_port);
return -1;
}
switch (qlmx_cfg.s.qlm_spd) {
case 0x1: /* SRIO 1x4 short */
case 0x3: /* SRIO 1x4 long */
case 0x4: /* SRIO 2x2 short */
case 0x6: /* SRIO 2x2 long */
pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
return -1;
case 0x9: /* SGMII */
pr_notice("PCIe: Port %d is SGMII, skipping.\n", pcie_port);
return -1;
case 0xb: /* XAUI */
pr_notice("PCIe: Port %d is XAUI, skipping.\n", pcie_port);
return -1;
case 0x0: /* PCIE gen2 */
case 0x8: /* PCIE gen2 (alias) */
case 0x2: /* PCIE gen1 */
case 0xa: /* PCIE gen1 (alias) */
break;
default:
pr_notice("PCIe: Port %d is unknown, skipping.\n", pcie_port);
return -1;
}
} else {
sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(pcie_port));
if (sriox_status_reg.s.srio) {
pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
return -1;
}
}
}
#if 0
/* This code is so that the PCIe analyzer is able to see 63XX traffic */
pr_notice("PCIE : init for pcie analyzer.\n");
cvmx_helper_qlm_jtag_init();
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
cvmx_helper_qlm_jtag_update(pcie_port);
#endif
/* Make sure we aren't trying to setup a target mode interface in host mode */
mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(pcie_port));
if (!mio_rst_ctl.s.host_mode) {
pr_notice("PCIe: Port %d in endpoint mode.\n", pcie_port);
return -1;
}
/* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be programmed */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) {
if (pcie_port) {
union cvmx_ciu_qlm1 ciu_qlm;
ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM1);
ciu_qlm.s.txbypass = 1;
ciu_qlm.s.txdeemph = 5;
ciu_qlm.s.txmargin = 0x17;
cvmx_write_csr(CVMX_CIU_QLM1, ciu_qlm.u64);
} else {
union cvmx_ciu_qlm0 ciu_qlm;
ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM0);
ciu_qlm.s.txbypass = 1;
ciu_qlm.s.txdeemph = 5;
ciu_qlm.s.txmargin = 0x17;
cvmx_write_csr(CVMX_CIU_QLM0, ciu_qlm.u64);
}
}
/* Bring the PCIe out of reset */
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 */
udelay(1000);
/*
* 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.
*/
if (CVMX_WAIT_FOR_FIELD64(CVMX_MIO_RST_CTLX(pcie_port), union cvmx_mio_rst_ctlx, rst_done, ==, 1, 10000)) {
pr_notice("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
return -1;
}
/* Check BIST status */
pemx_bist_status.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS(pcie_port));
if (pemx_bist_status.u64)
pr_notice("PCIe: BIST FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status.u64));
pemx_bist_status2.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS2(pcie_port));
/* Errata PCIE-14766 may cause the lower 6 bits to be randomly set on CN63XXp1 */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X))
pemx_bist_status2.u64 &= ~0x3full;
if (pemx_bist_status2.u64)
pr_notice("PCIe: BIST2 FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status2.u64));
/* Initialize the config space CSRs */
__cvmx_pcie_rc_initialize_config_space(pcie_port);
/* Enable gen2 speed selection */
pciercx_cfg515.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG515(pcie_port));
pciercx_cfg515.s.dsc = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32);
/* Bring the link up */
if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
/*
* Some gen1 devices don't handle the gen 2 training
* correctly. Disable gen2 and try again with only
* gen1
*/
union cvmx_pciercx_cfg031 pciercx_cfg031;
pciercx_cfg031.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG031(pcie_port));
pciercx_cfg031.s.mls = 1;
cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), pciercx_cfg031.u32);
if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
pr_notice("PCIe: Link timeout on port %d, probably the slot is empty\n", pcie_port);
return -1;
}
}
/* Store merge control (SLI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
sli_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL);
sli_mem_access_ctl.s.max_word = 0; /* Allow 16 words to combine */
sli_mem_access_ctl.s.timer = 127; /* Wait up to 127 cycles for more data */
cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL, sli_mem_access_ctl.u64);
/* Setup Mem access SubDIDs */
mem_access_subid.u64 = 0;
mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
mem_access_subid.s.nmerge = 0; /* Allow merging as it works on CN6XXX. */
mem_access_subid.s.esr = 1; /* Endian-swap for Reads. */
mem_access_subid.s.esw = 1; /* Endian-swap for Writes. */
mem_access_subid.s.wtype = 0; /* "No snoop" and "Relaxed ordering" are not set */
mem_access_subid.s.rtype = 0; /* "No snoop" and "Relaxed ordering" are not set */
/* PCIe Adddress Bits <63:34>. */
if (OCTEON_IS_MODEL(OCTEON_CN68XX))
mem_access_subid.cn68xx.ba = 0;
else
mem_access_subid.cn63xx.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_SLI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
/* Set each SUBID to extend the addressable range */
__cvmx_increment_ba(&mem_access_subid);
}
/*
* 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_PEMX_P2P_BARX_START(i, pcie_port), -1);
cvmx_write_csr(CVMX_PEMX_P2P_BARX_END(i, pcie_port), -1);
}
/* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
cvmx_write_csr(CVMX_PEMX_P2N_BAR0_START(pcie_port), 0);
/*
* Set Octeon's BAR2 to decode 0-2^41. 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_PEMX_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])
*/
pemx_bar_ctl.u64 = cvmx_read_csr(CVMX_PEMX_BAR_CTL(pcie_port));
pemx_bar_ctl.s.bar1_siz = 3; /* 256MB BAR1*/
pemx_bar_ctl.s.bar2_enb = 1;
pemx_bar_ctl.s.bar2_esx = 1;
pemx_bar_ctl.s.bar2_cax = 0;
cvmx_write_csr(CVMX_PEMX_BAR_CTL(pcie_port), pemx_bar_ctl.u64);
sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port));
sli_ctl_portx.s.ptlp_ro = 1;
sli_ctl_portx.s.ctlp_ro = 1;
sli_ctl_portx.s.wait_com = 0;
sli_ctl_portx.s.waitl_com = 0;
cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port), sli_ctl_portx.u64);
/* BAR1 follows BAR2 */
cvmx_write_csr(CVMX_PEMX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
bar1_index.u64 = 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 */
for (i = 0; i < 16; i++) {
cvmx_write_csr(CVMX_PEMX_BAR1_INDEXX(i, pcie_port), bar1_index.u64);
/* 256MB / 16 >> 22 == 4 */
bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
}
/*
* Allow config retries for 250ms. Count is based off the 5Ghz
* SERDES clock.
*/
pemx_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
pemx_ctl_status.s.cfg_rtry = 250 * 5000000 / 0x10000;
cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pemx_ctl_status.u64);
/* Display the link status */
pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
pr_notice("PCIe: Port %d link active, %d lanes, speed gen%d\n", pcie_port, pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls);
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 result;
if (octeon_has_feature(OCTEON_FEATURE_NPEI))
result = __cvmx_pcie_rc_initialize_gen1(pcie_port);
else
result = __cvmx_pcie_rc_initialize_gen2(pcie_port);
return result;
}
/* 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 == 1) &&
(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;
}
static void set_cfg_read_retry(u32 retry_cnt)
{
union cvmx_pemx_ctl_status pemx_ctl;
pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
pemx_ctl.s.cfg_rtry = retry_cnt;
cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
}
static u32 disable_cfg_read_retry(void)
{
u32 retry_cnt;
union cvmx_pemx_ctl_status pemx_ctl;
pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
retry_cnt = pemx_ctl.s.cfg_rtry;
pemx_ctl.s.cfg_rtry = 0;
cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
return retry_cnt;
}
static int is_cfg_retry(void)
{
union cvmx_pemx_int_sum pemx_int_sum;
pemx_int_sum.u64 = cvmx_read_csr(CVMX_PEMX_INT_SUM(1));
if (pemx_int_sum.s.crs_dr)
return 1;
return 0;
}
/*
* Read a value from configuration space
*
*/
static int octeon_pcie_read_config(unsigned 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;
int cfg_retry = 0;
int retry_cnt = 0;
int max_retry_cnt = 10;
u32 cfg_retry_cnt = 0;
cvmmemctl_save.u64 = 0;
BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
/*
* For the top level bus make sure our hardware bus number
* matches the software one
*/
if (bus->parent == NULL) {
if (enable_pcie_bus_num_war[pcie_port])
bus_number = 0;
else {
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 == 2)
return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
/*
* Use this option if you are using the first slot but
* not the second.
*/
if ((bus_number == 2) && (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 == 2) && (devfn >> 3 != 3))
return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
/* Use this opion if you are using both slots */
if ((bus_number == 2) &&
!((devfn == (2 << 3)) || (devfn == (3 << 3))))
return PCIBIOS_FUNC_NOT_SUPPORTED;
#endif
/* The following #if gives a more complicated example. This is
the required checks for running a Nitrox CN16XX-NHBX in the
slot of the EBH5600. This card has a PLX PCIe bridge with
four Nitrox PLX parts behind it */
#if 0
/* PLX bridge with 4 ports */
if ((bus_number == 4) &&
!((devfn >> 3 >= 1) && (devfn >> 3 <= 4)))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/* Nitrox behind PLX 1 */
if ((bus_number == 5) && (devfn >> 3 != 0))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/* Nitrox behind PLX 2 */
if ((bus_number == 6) && (devfn >> 3 != 0))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/* Nitrox behind PLX 3 */
if ((bus_number == 7) && (devfn >> 3 != 0))
return PCIBIOS_FUNC_NOT_SUPPORTED;
/* Nitrox behind PLX 4 */
if ((bus_number == 8) && (devfn >> 3 != 0))
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);
}
if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
cfg_retry_cnt = disable_cfg_read_retry();
pr_debug("pcie_cfg_rd port=%d b=%d devfn=0x%03x reg=0x%03x"
" size=%d ", pcie_port, bus_number, devfn, reg, size);
do {
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:
if (OCTEON_IS_MODEL(OCTEON_CN63XX))
set_cfg_read_retry(cfg_retry_cnt);
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) &&
(enable_pcie_14459_war)) {
cfg_retry = is_cfg_retry();
retry_cnt++;
if (retry_cnt > max_retry_cnt) {
pr_err(" pcie cfg_read retries failed. retry_cnt=%d\n",
retry_cnt);
cfg_retry = 0;
}
}
} while (cfg_retry);
if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
set_cfg_read_retry(cfg_retry_cnt);
pr_debug("val=%08x : tries=%02d\n", *val, retry_cnt);
if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
write_c0_cvmmemctl(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);
}
static int octeon_dummy_read_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 *val)
{
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
/*
* Write a value to PCI configuration space
*/
static int octeon_pcie_write_config(unsigned int pcie_port, struct pci_bus *bus,
unsigned int devfn, int reg,
int size, u32 val)
{
int bus_number = bus->number;
BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
if ((bus->parent == NULL) && (enable_pcie_bus_num_war[pcie_port]))
bus_number = 0;
pr_debug("pcie_cfg_wr port=%d b=%d devfn=0x%03x"
" reg=0x%03x size=%d val=%08x\n", pcie_port, bus_number, devfn,
reg, size, val);
switch (size) {
case 4:
cvmx_pcie_config_write32(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
break;
case 2:
cvmx_pcie_config_write16(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
break;
case 1:
cvmx_pcie_config_write8(pcie_port, bus_number, devfn >> 3,
devfn & 0x7, reg, val);
break;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
return PCIBIOS_SUCCESSFUL;
}
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 int octeon_dummy_write_config(struct pci_bus *bus, unsigned int devfn,
int reg, int size, u32 val)
{
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
static struct pci_ops octeon_pcie0_ops = {
.read = octeon_pcie0_read_config,
.write = 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 = {
.read = octeon_pcie1_read_config,
.write = 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,
};
static struct pci_ops octeon_dummy_ops = {
.read = octeon_dummy_read_config,
.write = octeon_dummy_write_config,
};
static struct resource octeon_dummy_mem_resource = {
.name = "Virtual PCIe MEM",
.flags = IORESOURCE_MEM,
};
static struct resource octeon_dummy_io_resource = {
.name = "Virtual PCIe IO",
.flags = IORESOURCE_IO,
};
static struct pci_controller octeon_dummy_controller = {
.pci_ops = &octeon_dummy_ops,
.mem_resource = &octeon_dummy_mem_resource,
.io_resource = &octeon_dummy_io_resource,
};
static int device_needs_bus_num_war(uint32_t deviceid)
{
#define IDT_VENDOR_ID 0x111d
if ((deviceid & 0xffff) == IDT_VENDOR_ID)
return 1;
return 0;
}
/**
* Initialize the Octeon PCIe controllers
*
* Returns
*/
static int __init octeon_pcie_setup(void)
{
int result;
int host_mode;
int srio_war15205 = 0, port;
union cvmx_sli_ctl_portx sli_ctl_portx;
union cvmx_sriox_status_reg sriox_status_reg;
/* These chips don't have PCIe */
if (!octeon_has_feature(OCTEON_FEATURE_PCIE))
return 0;
/* No PCIe simulation */
if (octeon_is_simulation())
return 0;
/* Disable PCI if instructed on the command line */
if (pcie_disable)
return 0;
/* Point pcibios_map_irq() to the PCIe version of it */
octeon_pcibios_map_irq = octeon_pcie_pcibios_map_irq;
/*
* 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;
/*
* Create a dummy PCIe controller to swallow up bus 0. IDT bridges
* don't work if the primary bus number is zero. Here we add a fake
* PCIe controller that the kernel will give bus 0. This allows
* us to not change the normal kernel bus enumeration
*/
octeon_dummy_controller.io_map_base = -1;
octeon_dummy_controller.mem_resource->start = (1ull<<48);
octeon_dummy_controller.mem_resource->end = (1ull<<48);
register_pci_controller(&octeon_dummy_controller);
if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
union cvmx_npei_ctl_status npei_ctl_status;
npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
host_mode = npei_ctl_status.s.host_mode;
octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE;
} else {
union cvmx_mio_rst_ctlx mio_rst_ctl;
mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(0));
host_mode = mio_rst_ctl.s.host_mode;
octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE2;
}
if (host_mode) {
pr_notice("PCIe: Initializing port 0\n");
/* CN63XX pass 1_x/2.0 errata PCIe-15205 */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(0));
if (sriox_status_reg.s.srio) {
srio_war15205 += 1; /* Port is SRIO */
port = 0;
}
}
result = cvmx_pcie_rc_initialize(0);
if (result == 0) {
uint32_t device0;
/* 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;
msleep(100); /* Some devices need extra time */
register_pci_controller(&octeon_pcie0_controller);
device0 = cvmx_pcie_config_read32(0, 0, 0, 0, 0);
enable_pcie_bus_num_war[0] =
device_needs_bus_num_war(device0);
}
} else {
pr_notice("PCIe: Port 0 in endpoint mode, skipping.\n");
/* CN63XX pass 1_x/2.0 errata PCIe-15205 */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
srio_war15205 += 1;
port = 0;
}
}
if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
host_mode = 1;
/* 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 dbg_data;
dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
if (dbg_data.cn52xx.qlm0_link_width)
host_mode = 0;
}
} else {
union cvmx_mio_rst_ctlx mio_rst_ctl;
mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(1));
host_mode = mio_rst_ctl.s.host_mode;
}
if (host_mode) {
pr_notice("PCIe: Initializing port 1\n");
/* CN63XX pass 1_x/2.0 errata PCIe-15205 */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(1));
if (sriox_status_reg.s.srio) {
srio_war15205 += 1; /* Port is SRIO */
port = 1;
}
}
result = cvmx_pcie_rc_initialize(1);
if (result == 0) {
uint32_t device0;
/* Memory offsets are physical addresses */
octeon_pcie1_controller.mem_offset =
cvmx_pcie_get_mem_base_address(1);
/*
* To calculate the address for accessing the 2nd PCIe device,
* either 'io_map_base' (pci_iomap()), or 'mips_io_port_base'
* (ioport_map()) value is added to
* pci_resource_start(dev,bar)). The 'mips_io_port_base' is set
* only once based on first PCIe. Also changing 'io_map_base'
* based on first slot's value so that both the routines will
* work properly.
*/
octeon_pcie1_controller.io_map_base =
CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0));
/* IO offsets are Mips virtual addresses */
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;
msleep(100); /* Some devices need extra time */
register_pci_controller(&octeon_pcie1_controller);
device0 = cvmx_pcie_config_read32(1, 0, 0, 0, 0);
enable_pcie_bus_num_war[1] =
device_needs_bus_num_war(device0);
}
} else {
pr_notice("PCIe: Port 1 not in root complex mode, skipping.\n");
/* CN63XX pass 1_x/2.0 errata PCIe-15205 */
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
srio_war15205 += 1;
port = 1;
}
}
/*
* CN63XX pass 1_x/2.0 errata PCIe-15205 requires setting all
* of SRIO MACs SLI_CTL_PORT*[INT*_MAP] to similar value and
* all of PCIe Macs SLI_CTL_PORT*[INT*_MAP] to different value
* from the previous set values
*/
if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
if (srio_war15205 == 1) {
sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(port));
sli_ctl_portx.s.inta_map = 1;
sli_ctl_portx.s.intb_map = 1;
sli_ctl_portx.s.intc_map = 1;
sli_ctl_portx.s.intd_map = 1;
cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(port), sli_ctl_portx.u64);
sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(!port));
sli_ctl_portx.s.inta_map = 0;
sli_ctl_portx.s.intb_map = 0;
sli_ctl_portx.s.intc_map = 0;
sli_ctl_portx.s.intd_map = 0;
cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(!port), sli_ctl_portx.u64);
}
}
octeon_pci_dma_init();
return 0;
}
arch_initcall(octeon_pcie_setup);
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