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/*
* 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 <console/console.h>
#include <device/pci_ids.h>
#include <soc/pci_devs.h>
#include <soc/reg_access.h>
/* USB Phy Registers */
#define USB2_GLOBAL_PORT 0x4001
#define USB2_PLL1 0x7F02
#define USB2_PLL2 0x7F03
#define USB2_COMPBG 0x7F04
/* In order to configure the USB PHY to use clk120 (ickusbcoreclk) as PLL
* reference clock and Port2 as a USB device port, the following sequence must
* be followed
*/
static const struct reg_script init_script[] = {
/* Sighting #4930631 PDNRESCFG [8:7] of USB2_GLOBAL_PORT = 11b.
* For port 0 & 1 as host and port 2 as device.
*/
REG_USB_RXW(USB2_GLOBAL_PORT, ~(BIT8 | BIT7 | BIT1), (BIT8 | BIT7)),
/*
* Sighting #4930653 Required BIOS change on Disconnect vref to change
* to 600mV.
*/
REG_USB_RXW(USB2_COMPBG, ~(BIT10 | BIT9 | BIT8 | BIT7),
(BIT10 | BIT7)),
/* Sideband register write to USB AFE (Phy)
* (pllbypass) to bypass/Disable PLL before switch
*/
REG_USB_OR(USB2_PLL2, BIT29),
/* Sideband register write to USB AFE (Phy)
* (coreclksel) to select 120MHz (ickusbcoreclk) clk source.
* (Default 0 to select 96MHz (ickusbclk96_npad/ppad))
*/
REG_USB_OR(USB2_PLL1, BIT1),
/* Sideband register write to USB AFE (Phy)
* (divide by 8) to achieve internal 480MHz clock
* for 120MHz input refclk. (Default: 4'b1000 (divide by 10) for 96MHz)
*/
REG_USB_RXW(USB2_PLL1, ~(BIT6 | BIT5 | BIT4 | BIT3), BIT6),
/* Sideband register write to USB AFE (Phy)
* Clear (pllbypass)
*/
REG_USB_AND(USB2_PLL2, ~BIT29),
/* Sideband register write to USB AFE (Phy)
* Set (startlock) to force the PLL FSM to restart the lock
* sequence due to input clock/freq switch.
*/
REG_USB_OR(USB2_PLL2, BIT24),
REG_SCRIPT_END
};
static void init(device_t dev)
{
printk(BIOS_INFO, "Initializing USB PLLs\n");
reg_script_run_on_dev(dev, init_script);
}
static struct device_operations device_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = init,
};
static const struct pci_driver driver __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.device = EHCI_DEVID,
};
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