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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <delay.h>
#include <arch/io.h>
#include <console/console.h>
#include <soc/clock.h>
#include "usb.h"
/* Assume USBx clocked, out of reset, UTMI+ PLL set up, SAMP_x out of pwrdn */
void usb_setup_utmip(struct usb_ctlr *usb)
{
/* KHz formulas were guessed from U-Boot constants. Formats unclear. */
int khz = clock_get_pll_input_khz();
/* Stop UTMI+ crystal clock while we mess with its settings */
clrbits_le32(&usb->utmip.misc1, 1 << 30); /* PHY_XTAL_CLKEN */
udelay(1);
/* Take stuff out of pwrdn and add some magic numbers from U-Boot */
write32(0x8 << 25 | /* HS slew rate [10:4] */
0x3 << 22 | /* HS driver output 'SETUP' [6:4] */
0 << 21 | /* LS bias selection */
0 << 18 | /* PDZI pwrdn */
0 << 16 | /* PD2 pwrdn */
0 << 14 | /* PD pwrdn */
1 << 13 | /* (rst) HS receiver terminations */
0x1 << 10 | /* (rst) LS falling slew rate */
0x1 << 8 | /* (rst) LS rising slew rate */
0x4 << 0 | /* HS driver output 'SETUP' [3:0] */
0, &usb->utmip.xcvr0);
write32(0x7 << 18 | /* Termination range adjustment */
0 << 4 | /* PDDR pwrdn */
0 << 2 | /* PDCHRP pwrdn */
0 << 0 | /* PDDISC pwrdn */
0, &usb->utmip.xcvr1);
write32(1 << 19 | /* FS send initial J before sync(?) */
1 << 16 | /* (rst) Allow stuff error on SoP */
1 << 9 | /* (rst) Check disc only on EoP */
0, &usb->utmip.tx);
write32(0x2 << 30 | /* (rst) Keep pattern on active */
1 << 28 | /* (rst) Realign inertia on pkt */
0x1 << 24 | /* (rst) edges-1 to move sampling */
0x3 << 21 | /* (rst) squelch delay on EoP */
0x11 << 15 | /* cycles until IDLE */
0x10 << 10 | /* elastic input depth */
0, &usb->utmip.hsrx0);
/* U-Boot claims the USBD values for these are used across all UTMI+
* PHYs. That sounds so horribly wrong that I'm not going to implement
* it, but keep it in mind if we're ever not using the USBD port. */
write32(0x1 << 24 | /* HS disconnect detect level [2] */
1 << 23 | /* (rst) IDPD value */
1 << 22 | /* (rst) IDPD select */
1 << 11 | /* (rst) OTG pwrdn */
0 << 10 | /* bias pwrdn */
0x1 << 2 | /* HS disconnect detect level [1:0] */
0x2 << 0 | /* HS squelch detect level */
0, &usb->utmip.bias0);
write32(khz / 2200 << 3 | /* bias pwrdn cycles (20us?) */
1 << 2 | /* (rst) VBUS wakeup pwrdn */
0 << 0 | /* PDTRK pwrdn */
0, &usb->utmip.bias1);
write32(0xffff << 16 | /* (rst) */
25 * khz / 10 << 0 | /* TODO: what's this, really? */
0, &usb->utmip.debounce);
udelay(1);
setbits_le32(&usb->utmip.misc1, 1 << 30); /* PHY_XTAL_CLKEN */
write32(1 << 12 | /* UTMI+ enable */
0 << 11 | /* UTMI+ reset */
0, &usb->suspend_ctrl);
}
/*
* Tegra EHCI controllers need their usb_mode, lpm_ctrl and tx_fill_tuning
* registers initialized after every EHCI reset and before any other actions
* (such as Run/Stop bit) are taken. We reset the controller here, set those
* registers and rely on the fact that libpayload doesn't reset EHCI controllers
* on initialization for whatever weird reason. This is ugly, fragile, and I
* really don't like it, but making this work will require an ugly hack one way
* or another so we might as well take the path of least resistance for now.
*/
void usb_ehci_reset_and_prepare(struct usb_ctlr *usb, enum usb_phy_type type)
{
int timeout = 1000;
write32(1 << 1, &usb->ehci_usbcmd); /* Host Controller Reset */
/* TODO: Resets are long, find way to parallelize... or just use XHCI */
while (--timeout && (read32(&usb->ehci_usbcmd) & 1 << 1))
/* wait for HC to reset */;
if (!timeout) {
printk(BIOS_ERR, "ERROR: EHCI(%p) reset timeout", usb);
return;
}
write32(3 << 0, &usb->usb_mode); /* Controller mode: HOST */
write32(type << 29, &usb->lpm_ctrl); /* Parallel transceiver selct */
write32(0x10 << 16, &usb->tx_fill_tuning); /* Tx FIFO Burst thresh */
}
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