/* * 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/moduleparam.h>
union cvmx_pcie_address {
uint64_t u64; struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 1 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t es:2; /* Endian swap = 1 */
uint64_t port:2; /* PCIe port 0,1 */
uint64_t reserved_29_31:3; /* Must be zero */ /* * Selects the type of the configuration request (0 = type 0, * 1 = type 1).
*/
uint64_t ty:1; /* Target bus number sent in the ID in the request. */
uint64_t bus:8; /* * Target device number sent in the ID in the * request. Note that Dev must be zero for type 0 * configuration requests.
*/
uint64_t dev:5; /* Target function number sent in the ID in the request. */
uint64_t func:3; /* * Selects a register in the configuration space of * the target.
*/
uint64_t reg:12;
} config; struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 2 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t es:2; /* Endian swap = 1 */
uint64_t port:2; /* PCIe port 0,1 */
uint64_t address:32; /* PCIe IO address */
} io; struct {
uint64_t upper:2; /* Normally 2 for XKPHYS */
uint64_t reserved_49_61:13; /* Must be zero */
uint64_t io:1; /* 1 for IO space access */
uint64_t did:5; /* PCIe DID = 3 */
uint64_t subdid:3; /* PCIe SubDID = 3-6 */
uint64_t reserved_36_39:4; /* Must be zero */
uint64_t address:36; /* PCIe Mem address */
} mem;
};
staticint cvmx_pcie_rc_initialize(int pcie_port);
/** * 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
*/ staticinline 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
*/ staticinline 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
*/ staticinline 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
*/ staticinline 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
*/ staticvoid 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
*/ staticinline 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; union cvmx_pciercx_cfg032 pciercx_cfg032;
/** * 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
*/ staticvoid 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
*/ staticvoid 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
*/ staticvoid 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
*/ staticvoid __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;
/* 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);
/** * 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
*/ staticint __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;
}
__delay(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);
/** * 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
*/ staticint __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.
*/
__delay(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 Address 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);
/* * 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);
__delay(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);
__delay(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 its 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);
__delay(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.
*/ staticint __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;
__delay(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.
*/ staticint __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_qlm 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_qlm 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);
/* 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 Address Bits <63:34>. */ if (OCTEON_IS_MODEL(OCTEON_CN68XX))
mem_access_subid.cn68xx.ba = 0; else
mem_access_subid.s.ba = 0;
/* * Setup mem access 12-15 for port 0, 16-19 for port 1, * supplying 36 bits of address space.
*/ for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
cvmx_write_csr(CVMX_PEXP_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);
/* * 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
*/ staticint 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 octeon_pcie_pcibios_map_irq(conststruct 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;
}
staticint 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 *
*/ staticint octeon_pcie_read_config(unsignedint pcie_port, struct pci_bus *bus, unsignedint 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();
staticint octeon_dummy_read_config(struct pci_bus *bus, unsignedint devfn, int reg, int size, u32 *val)
{ return PCIBIOS_FUNC_NOT_SUPPORTED;
}
/* * Write a value to PCI configuration space
*/ staticint octeon_pcie_write_config(unsignedint pcie_port, struct pci_bus *bus, unsignedint devfn, int reg, int size, u32 val)
{ int bus_number = bus->number;
/** * Initialize the Octeon PCIe controllers * * Returns
*/ staticint __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 (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,
--> --------------------
--> maximum size reached
--> --------------------
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