| /* |
| * Driver for BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge |
| * |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2018 Google LLC |
| * |
| * 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/path.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| #include <device/pci_ids.h> |
| #include "chip.h" |
| #include "bh720.h" |
| |
| __attribute__((weak)) void board_bh720(struct device *dev) |
| { |
| } |
| |
| static void bh720_init(struct device *dev) |
| { |
| struct drivers_generic_bayhub_config *config = dev->chip_info; |
| |
| pci_dev_init(dev); |
| |
| if (config && config->power_saving) { |
| /* |
| * This procedure for enabling power-saving mode is from the |
| * BayHub BIOS Implementation Guideline document. |
| */ |
| pci_write_config32(dev, BH720_PROTECT, |
| BH720_PROTECT_OFF | BH720_PROTECT_LOCK_OFF); |
| pci_or_config32(dev, BH720_RTD3_L1, BH720_RTD3_L1_DISABLE_L1); |
| pci_or_config32(dev, BH720_LINK_CTRL, |
| BH720_LINK_CTRL_L0_ENABLE | |
| BH720_LINK_CTRL_L1_ENABLE); |
| pci_or_config32(dev, BH720_LINK_CTRL, BH720_LINK_CTRL_CLKREQ); |
| pci_update_config32(dev, BH720_MISC2, ~BH720_MISC2_ASPM_DISABLE, |
| BH720_MISC2_APSM_CLKREQ_L1 | |
| BH720_MISC2_APSM_PHY_L1); |
| pci_write_config32(dev, BH720_PROTECT, |
| BH720_PROTECT_ON | BH720_PROTECT_LOCK_ON); |
| |
| printk(BIOS_INFO, "BayHub BH720: Power-saving enabled (link_ctrl=%#x)\n", |
| pci_read_config32(dev, BH720_LINK_CTRL)); |
| } |
| |
| board_bh720(dev); |
| } |
| |
| static struct pci_operations pci_ops = { |
| .set_subsystem = pci_dev_set_subsystem, |
| }; |
| |
| static struct device_operations bh720_ops = { |
| .read_resources = pci_dev_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .ops_pci = &pci_ops, |
| .init = bh720_init, |
| }; |
| |
| static const unsigned short pci_device_ids[] = { |
| PCI_DEVICE_ID_O2_BH720, |
| 0 |
| }; |
| |
| static const struct pci_driver bayhub_bh720 __pci_driver = { |
| .ops = &bh720_ops, |
| .vendor = PCI_VENDOR_ID_O2, |
| .devices = pci_device_ids, |
| }; |
| |
| static void bh720_enable(struct device *dev) |
| { |
| dev->ops = &bh720_ops; |
| } |
| |
| struct chip_operations bayhub_bh720_ops = { |
| CHIP_NAME("BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge") |
| .enable_dev = bh720_enable, |
| }; |