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/*
* 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_ids.h>
#include "chip.h"
enum {
BH720_PROTECT = 0xd0,
BH720_PROTECT_OFF = 0,
BH720_PROTECT_ON = 1,
BH720_RTD3_L1 = 0x3e0,
BH720_RTD3_L1_DISABLE_L1 = BIT(28),
BH720_LINK_CTRL = 0x90,
BH720_LINK_CTRL_L0_ENABLE = BIT(0),
BH720_LINK_CTRL_L1_ENABLE = BIT(1),
BH720_LINK_CTRL_CLKREQ = BIT(8),
};
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);
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_write_config32(dev, BH720_PROTECT, BH720_PROTECT_ON);
printk(BIOS_INFO, "BayHub BH720: Power-saving enabled (link_ctrl=%#x)\n",
pci_read_config32(dev, BH720_LINK_CTRL));
}
}
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,
};
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