| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2016 Intel Corporation. |
| * |
| * 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 <delay.h> |
| #include <device/device.h> |
| #include <soc/pci_devs.h> |
| #include <soc/reg_access.h> |
| #include <soc/romstage.h> |
| |
| /* Minimum time in microseconds for assertion of PERST# signal */ |
| #define PCIEXP_PERST_MIN_ASSERT_US 100 |
| |
| /* Microsecond delay post issuing common lane reset */ |
| #define PCIEXP_DELAY_US_POST_CMNRESET_RESET 1 |
| |
| /* Microsecond delay to wait for PLL to lock */ |
| #define PCIEXP_DELAY_US_WAIT_PLL_LOCK 80 |
| |
| /* Microsecond delay post issuing sideband interface reset */ |
| #define PCIEXP_DELAY_US_POST_SBI_RESET 20 |
| |
| /* Microsecond delay post deasserting PERST# */ |
| #define PCIEXP_DELAY_US_POST_PERST_DEASSERT 10 |
| |
| const struct reg_script pcie_init_script[] = { |
| /* Assert PCIe reset# */ |
| MAINBOARD_PCIE_RESET(0), |
| |
| /* PHY Common lane reset */ |
| REG_SOC_UNIT_OR(QUARK_SCSS_SOC_UNIT_SOCCLKEN_CONFIG, |
| SOCCLKEN_CONFIG_PHY_I_CMNRESET_L), |
| |
| /* Wait post common lane reset */ |
| TIME_DELAY_USEC(PCIEXP_DELAY_US_POST_CMNRESET_RESET), |
| |
| /* PHY Sideband interface reset. |
| * Controller main reset |
| */ |
| REG_SOC_UNIT_OR(QUARK_SCSS_SOC_UNIT_SOCCLKEN_CONFIG, |
| SOCCLKEN_CONFIG_SBI_RST_100_CORE_B |
| | SOCCLKEN_CONFIG_PHY_I_SIDE_RST_L), |
| TIME_DELAY_USEC(PCIEXP_DELAY_US_WAIT_PLL_LOCK), |
| |
| /* Controller sideband interface reset */ |
| REG_SOC_UNIT_OR(QUARK_SCSS_SOC_UNIT_SOCCLKEN_CONFIG, |
| SOCCLKEN_CONFIG_SBI_BB_RST_B), |
| |
| /* Wait post sideband interface reset */ |
| TIME_DELAY_USEC(PCIEXP_DELAY_US_POST_SBI_RESET), |
| |
| /* Deassert PCIe reset# */ |
| MAINBOARD_PCIE_RESET(1), |
| |
| /* Wait post de assert PERST#. */ |
| TIME_DELAY_USEC(PCIEXP_DELAY_US_POST_PERST_DEASSERT), |
| |
| /* Controller primary interface reset */ |
| REG_SOC_UNIT_OR(QUARK_SCSS_SOC_UNIT_SOCCLKEN_CONFIG, |
| SOCCLKEN_CONFIG_BB_RST_B), |
| |
| /* Set the mixer load resistance */ |
| REG_PCIE_AFE_AND(QUARK_PCIE_AFE_PCIE_RXPICTRL0_L0, |
| OCFGPIMIXLOAD_1_0_MASK), |
| REG_PCIE_AFE_AND(QUARK_PCIE_AFE_PCIE_RXPICTRL0_L1, |
| OCFGPIMIXLOAD_1_0_MASK), |
| REG_SCRIPT_END |
| }; |
| |
| static const struct reg_script pcie_bus_init_script[] = { |
| /* Setup Message Bus Idle Counter (SBIC) values */ |
| REG_PCI_RMW8(R_QNC_PCIE_IOSFSBCTL, ~B_QNC_PCIE_IOSFSBCTL_SBIC_MASK, |
| V_PCIE_ROOT_PORT_SBIC_VALUE), |
| REG_PCI_READ8(R_QNC_PCIE_IOSFSBCTL), |
| |
| /* Set the IPF bit in MCR2 */ |
| REG_PCI_OR32(R_QNC_PCIE_MPC2, B_QNC_PCIE_MPC2_IPF), |
| REG_PCI_READ32(R_QNC_PCIE_MPC2), |
| |
| /* Set up the Posted and Non Posted Request sizes for PCIe */ |
| REG_PCI_RMW32(R_QNC_PCIE_CCFG, ~B_QNC_PCIE_CCFG_UPSD, |
| (B_QNC_PCIE_CCFG_UNRS | B_QNC_PCIE_CCFG_UPRS)), |
| REG_PCI_READ32(R_QNC_PCIE_CCFG), |
| REG_SCRIPT_END |
| }; |
| |
| void pcie_init(void) |
| { |
| /* Initialize the PCIe bridges */ |
| reg_script_run(pcie_init_script); |
| reg_script_run_on_dev(PCIE_PORT0_BDF, pcie_bus_init_script); |
| reg_script_run_on_dev(PCIE_PORT1_BDF, pcie_bus_init_script); |
| } |