| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2013 Google Inc. |
| * Copyright (C) 2015 Intel Corp. |
| * |
| * 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 "chip.h" |
| #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 <soc/pci_devs.h> |
| #include <soc/pcie.h> |
| #include <soc/ramstage.h> |
| #include <soc/smm.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 void pcie_init(struct device *dev) |
| { |
| printk(BIOS_SPEW, "%s/%s ( %s )\n", |
| __FILE__, __func__, dev_name(dev)); |
| } |
| |
| 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; |
| |
| printk(BIOS_SPEW, "%s/%s ( %s )\n", |
| __FILE__, __func__, dev_name(dev)); |
| |
| 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(struct device *dev) |
| { |
| /* port1_dev will store the dev struct pointer of the PORT1 */ |
| static struct device *port1_dev; |
| |
| /* |
| * The SOC has 4 ROOT ports defined with MAX_ROOT_PORTS_BSW. |
| * For each port initial assumption is that, each port will have |
| * devices connected to it. Later we will scan each PORT and if |
| * the device is not attached to that port we will update |
| * rootports_in_use. If none of the root port is in use we will |
| * disable PORT1 otherwise we will keep PORT1 enabled per spec. |
| * In future if the Soc has more number of PCIe Root ports then |
| * change MAX_ROOT_PORTS_BSW value accordingly. |
| */ |
| |
| static uint32_t rootports_in_use = MAX_ROOT_PORTS_BSW; |
| |
| printk(BIOS_SPEW, "%s/%s ( %s )\n", |
| __FILE__, __func__, dev_name(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)) { |
| rootports_in_use--; |
| printk(BIOS_DEBUG, "No PCIe device present."); |
| |
| /* |
| * Defer PORT1 disabling for now. When we are at Last port |
| * we will check rootports_in_use and disable PORT1 if none |
| * of the port has any device connected |
| */ |
| if (!is_first_port(dev)) { |
| reg_script_run_on_dev(dev, no_dev_behind_port); |
| dev->enabled = 0; |
| } else |
| port1_dev = dev; |
| /* |
| * If none of the ROOT PORT has devices connected then |
| * disable PORT1 else keep the PORT1 enable |
| */ |
| if (!rootports_in_use) { |
| reg_script_run_on_dev(port1_dev, no_dev_behind_port); |
| port1_dev->enabled = 0; |
| southcluster_enable_dev(port1_dev); |
| } |
| } 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 pcie_enable(struct device *dev) |
| { |
| printk(BIOS_SPEW, "%s/%s ( %s )\n", |
| __FILE__, __func__, dev_name(dev)); |
| if (is_first_port(dev)) { |
| struct soc_intel_braswell_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 pcie_root_set_subsystem(struct device *dev, unsigned int vid, |
| unsigned int did) |
| { |
| printk(BIOS_SPEW, "%s/%s ( %s, 0x%04x, 0x%04x )\n", |
| __FILE__, __func__, dev_name(dev), vid, 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 = pcie_init, |
| .scan_bus = pciexp_scan_bridge, |
| .enable = 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, |
| }; |