diff options
Diffstat (limited to 'src/soc/intel/baytrail/pcie.c')
| -rw-r--r-- | src/soc/intel/baytrail/pcie.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/soc/intel/baytrail/pcie.c b/src/soc/intel/baytrail/pcie.c new file mode 100644 index 0000000000..f68304df06 --- /dev/null +++ b/src/soc/intel/baytrail/pcie.c @@ -0,0 +1,230 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pciexp.h> +#include <device/pci_ids.h> +#include <reg_script.h> + +#include <baytrail/pci_devs.h> +#include <baytrail/pcie.h> +#include <baytrail/ramstage.h> + +#include "chip.h" + +static int pll_en_off; +static uint32_t strpfusecfg; + +static inline int root_port_offset(device_t dev) +{ + return PCI_FUNC(dev->path.pci.devfn); +} + +static inline int is_first_port(device_t dev) +{ + return root_port_offset(dev) == PCIE_PORT1_FUNC; +} + +static const struct reg_script init_static_before_exit_latency[] = { + /* Disable optimized buffer flush fill and latency tolerant reporting */ + REG_PCI_RMW32(DCAP2, ~(OBFFS | LTRMS), 0), + REG_PCI_RMW32(DSTS2, ~(OBFFEN| LTRME), 0), + /* Set maximum payload size. */ + REG_PCI_RMW32(DCAP, ~MPS_MASK, 0), + /* Disable transmit datapath flush timer, clear transmit config change + * wait time, clear sideband interface idle counter. */ + REG_PCI_RMW32(PHYCTL2_IOSFBCTL, ~(TDFT | TXCFGCHWAIT | SIID), 0), + REG_SCRIPT_END, +}; + +static const struct reg_script init_static_after_exit_latency[] = { + /* Set common clock configuration. */ + REG_PCI_OR16(LCTL, CCC), + /* Set NFTS to 0x743a361b */ + REG_PCI_WRITE32(NFTS, 0x743a361b), + /* Set common clock latency to 0x3 */ + REG_PCI_RMW32(MPC, ~CCEL_MASK, (0x3 << CCEL_SHIFT)), + /* Set relay timer policy. */ + REG_PCI_RMW32(RTP, 0xff000000, 0x854c74), + /* Set IOSF packet fast transmit mode and link speed training policy. */ + REG_PCI_OR16(MPC2, IPF | LSTP), + /* Channel configuration - enable upstream posted split, set non-posted + * and posted request size */ + REG_PCI_RMW32(CHCFG, ~UPSD, UNRS | UPRS), + /* Completion status replay enable and set TLP grant count */ + REG_PCI_RMW32(CFG2, ~(LATGC_MASK), CSREN | (3 << LATGC_SHIFT)), + /* Assume no IOAPIC behind root port -- disable EOI forwarding. */ + REG_PCI_OR16(MPC2, EOIFD), + /* Expose AER */ + REG_PCI_RMW32(AERCH, ~0, (1 << 16) | (1 << 0)), + /* set completion timeout to 160ms to 170ms */ + REG_PCI_RMW16(DSTS2, ~CTD, 0x6), + /* Enable AER */ + REG_PCI_OR16(DCTL_DSTS, URE | FEE | NFE | CEE), + /* Read and write back capabaility registers. */ + REG_PCI_OR32(0x34, 0), + REG_PCI_OR32(0x80, 0), + /* Retrain the link. */ + REG_PCI_OR16(LCTL, RL), + REG_SCRIPT_END, +}; + +static void byt_pcie_init(device_t dev) +{ + struct reg_script init_script[] = { + REG_SCRIPT_SET_DEV(dev), + REG_SCRIPT_NEXT(init_static_before_exit_latency), + /* Exit latency configuration based on + * PHYCTL2_IOSFBCTL[PLL_OFF_EN] set in root port 1*/ + REG_PCI_RMW32(LCAP, ~L1EXIT_MASK, + 2 << (L1EXIT_MASK + pll_en_off)), + REG_SCRIPT_NEXT(init_static_after_exit_latency), + /* Disable hot plug, set power to 10W, set slot number. */ + REG_PCI_RMW32(SLCAP, ~(HPC | HPS), + (1 << SLS_SHIFT) | (100 << SLV_SHIFT) | + (root_port_offset(dev) << SLN_SHIFT)), + /* Dynamic clock gating. */ + REG_PCI_OR32(RPPGEN, RPDLCGEN | RPDBCGEN | RPSCGEN), + REG_PCI_OR32(PWRCTL, RPL1SQPOL | RPDTSQPOL), + REG_PCI_OR32(PCIEDBG, SPCE), + REG_SCRIPT_END, + }; + + reg_script_run(init_script); + + if (is_first_port(dev)) { + struct soc_intel_baytrail_config *config = dev->chip_info; + uint32_t reg = pci_read_config32(dev, RPPGEN); + reg |= SRDLCGEN | SRDBCGEN; + + if (config && config->clkreq_enable) + reg |= LCLKREQEN | BBCLKREQEN; + + pci_write_config32(dev, RPPGEN, reg); + } +} + +static const struct reg_script no_dev_behind_port[] = { + REG_PCI_OR32(PCIEALC, (1 << 26)), + REG_PCI_POLL32(PCIESTS1, 0x1f000000, (1 << 24), 50000), + REG_PCI_OR32(PHYCTL4, SQDIS), + REG_SCRIPT_END, +}; + +static void check_port_enabled(device_t dev) +{ + int rp_config = (strpfusecfg & LANECFG_MASK) >> LANECFG_SHIFT; + + switch (root_port_offset(dev)) { + case PCIE_PORT1_FUNC: + /* Port 1 cannot be disabled from strapping config. */ + break; + case PCIE_PORT2_FUNC: + /* Port 2 disabled in all configs but 4x1. */ + if (rp_config != 0x0) + dev->enabled = 0; + break; + case PCIE_PORT3_FUNC: + /* Port 3 disabled only in 1x4 config. */ + if (rp_config == 0x3) + dev->enabled = 0; + break; + case PCIE_PORT4_FUNC: + /* Port 4 disabled in 1x4 and 2x2 config. */ + if (rp_config >= 0x2) + dev->enabled = 0; + break; + } +} + +static void check_device_present(device_t dev) +{ + struct reg_script no_dev[] = { + REG_SCRIPT_SET_DEV(dev), + REG_SCRIPT_NEXT(no_dev_behind_port), + REG_SCRIPT_END, + }; + + /* Set slot implemented. */ + pci_write_config32(dev, XCAP, pci_read_config32(dev, XCAP) | SI); + + /* No device present. */ + if (!(pci_read_config32(dev, SLCTL_SLSTS) & PDS)) { + printk(BIOS_DEBUG, "No PCIe device present.\n"); + reg_script_run(no_dev); + dev->enabled = 0; + } else if(!dev->enabled) { + /* Port is disabled, but device present. Disable link. */ + pci_write_config32(dev, LCTL, + pci_read_config32(dev, LCTL) | LD); + } +} + +static void byt_pcie_enable(device_t dev) +{ + if (is_first_port(dev)) { + uint32_t reg = pci_read_config32(dev, PHYCTL2_IOSFBCTL); + pll_en_off = !!(reg & PLL_OFF_EN); + + strpfusecfg = pci_read_config32(dev, STRPFUSECFG); + } + + /* Check if device is enabled in strapping. */ + check_port_enabled(dev); + /* Determine if device is behind port. */ + check_device_present(dev); + + southcluster_enable_dev(dev); +} + +static void pcie_root_set_subsystem(device_t dev, unsigned vid, unsigned did) +{ + uint32_t didvid = ((did & 0xffff) << 16) | (vid & 0xffff); + + if (!didvid) + didvid = pci_read_config32(dev, PCI_VENDOR_ID); + pci_write_config32(dev, 0x94, didvid); +} + +static struct pci_operations pcie_root_ops = { + .set_subsystem = &pcie_root_set_subsystem, +}; + +static struct device_operations device_ops = { + .read_resources = pci_bus_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_bus_enable_resources, + .init = byt_pcie_init, + .scan_bus = pciexp_scan_bridge, + .enable = byt_pcie_enable, + .ops_pci = &pcie_root_ops, +}; + +static const unsigned short pci_device_ids[] = { + PCIE_PORT1_DEVID, PCIE_PORT2_DEVID, PCIE_PORT3_DEVID, PCIE_PORT4_DEVID, + 0 +}; + +static const struct pci_driver pcie_root_ports __pci_driver = { + .ops = &device_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .devices = pci_device_ids, +}; |