| /* |
| * 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. |
| */ |
| |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| #include <device/pciexp.h> |
| #include <device/pci_ids.h> |
| #include <reg_script.h> |
| |
| #include <soc/pci_devs.h> |
| #include <soc/pcie.h> |
| #include <soc/ramstage.h> |
| #include <soc/smm.h> |
| |
| #include "chip.h" |
| |
| static int pll_en_off; |
| static uint32_t strpfusecfg; |
| |
| static inline int root_port_offset(struct device *dev) |
| { |
| return PCI_FUNC(dev->path.pci.devfn); |
| } |
| |
| static inline int is_first_port(struct device *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 capability 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(struct device *dev) |
| { |
| struct reg_script init_script[] = { |
| 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_SHIFT + 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_on_dev(dev, 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(struct device *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 u8 all_ports_no_dev_present(struct device *dev) |
| { |
| u8 func; |
| u8 temp = dev->path.pci.devfn; |
| u8 device_not_present = 1; |
| u8 data; |
| |
| for (func = 1; func < PCIE_ROOT_PORT_COUNT; func++) { |
| dev->path.pci.devfn &= ~0x7; |
| dev->path.pci.devfn |= func; |
| |
| /* is pcie device there */ |
| if (pci_read_config32(dev, 0) == 0xFFFFFFFF) |
| continue; |
| |
| data = pci_read_config8(dev, XCAP + 3) | (SI >> 24); |
| pci_write_config8(dev, XCAP + 3, data); |
| |
| /* is any device present */ |
| if ((pci_read_config32(dev, SLCTL_SLSTS) & PDS)) { |
| device_not_present = 0; |
| break; |
| } |
| } |
| |
| dev->path.pci.devfn = temp; |
| return device_not_present; |
| } |
| |
| static void check_device_present(struct device *dev) |
| { |
| /* 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"); |
| if (is_first_port(dev)) { |
| if (all_ports_no_dev_present(dev)) { |
| reg_script_run_on_dev(dev, no_dev_behind_port); |
| dev->enabled = 0; |
| } |
| } else { |
| reg_script_run_on_dev(dev, no_dev_behind_port); |
| 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(struct device *dev) |
| { |
| if (is_first_port(dev)) { |
| struct soc_intel_baytrail_config *config = dev->chip_info; |
| uint32_t reg = pci_read_config32(dev, PHYCTL2_IOSFBCTL); |
| pll_en_off = !!(reg & PLL_OFF_EN); |
| |
| strpfusecfg = pci_read_config32(dev, STRPFUSECFG); |
| |
| if (config && config->pcie_wake_enable) |
| southcluster_smm_save_param( |
| SMM_SAVE_PARAM_PCIE_WAKE_ENABLE, 1); |
| } |
| |
| /* 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 byt_pciexp_scan_bridge(struct device *dev) |
| { |
| static const struct reg_script wait_for_link_active[] = { |
| REG_PCI_POLL32(LCTL, (1 << 29), (1 << 29), 50000), |
| REG_SCRIPT_END, |
| }; |
| |
| /* wait for Link Active with 50ms timeout */ |
| reg_script_run_on_dev(dev, wait_for_link_active); |
| |
| do_pci_scan_bridge(dev, pciexp_scan_bus); |
| } |
| |
| static struct pci_operations pcie_root_ops = { |
| .set_subsystem = pci_dev_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 = byt_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, |
| }; |