diff options
Diffstat (limited to 'kernel/arch/mips/pci/pcie-octeon.c')
| -rw-r--r-- | kernel/arch/mips/pci/pcie-octeon.c | 2091 |
1 files changed, 2091 insertions, 0 deletions
diff --git a/kernel/arch/mips/pci/pcie-octeon.c b/kernel/arch/mips/pci/pcie-octeon.c new file mode 100644 index 000000000..99f3db4f0 --- /dev/null +++ b/kernel/arch/mips/pci/pcie-octeon.c @@ -0,0 +1,2091 @@ +/* + * 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); |