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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
* Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Jana Rapava <fermata7@gmail.com>
* Igor Grinberg <grinberg@compulab.co.il>
*
* Based on:
* linux/drivers/usb/otg/ulpi.c
* Generic ULPI USB transceiver support
*
* Original Copyright follow:
* Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
*
* Based on sources from
*
* Sascha Hauer <s.hauer@pengutronix.de>
* Freescale Semiconductors
*/
#include <common.h>
#include <exports.h>
#include <log.h>
#include <linux/delay.h>
#include <usb/ulpi.h>
#define ULPI_ID_REGS_COUNT 4
#define ULPI_TEST_VALUE 0x55 /* 0x55 == 0b01010101 */
static struct ulpi_regs *ulpi = (struct ulpi_regs *)0;
static int ulpi_integrity_check(struct ulpi_viewport *ulpi_vp)
{
u32 val, tval = ULPI_TEST_VALUE;
int err, i;
/* Use the 'special' test value to check all bits */
for (i = 0; i < 2; i++, tval <<= 1) {
err = ulpi_write(ulpi_vp, &ulpi->scratch, tval);
if (err)
return err;
val = ulpi_read(ulpi_vp, &ulpi->scratch);
if (val != tval) {
printf("ULPI integrity check failed\n");
return val;
}
}
return 0;
}
int ulpi_init(struct ulpi_viewport *ulpi_vp)
{
u32 val, id = 0;
u8 *reg = &ulpi->product_id_high;
int i;
/* Assemble ID from four ULPI ID registers (8 bits each). */
for (i = 0; i < ULPI_ID_REGS_COUNT; i++) {
val = ulpi_read(ulpi_vp, reg - i);
if (val == ULPI_ERROR)
return val;
id = (id << 8) | val;
}
/* Split ID into vendor and product ID. */
debug("ULPI transceiver ID 0x%04x:0x%04x\n", id >> 16, id & 0xffff);
return ulpi_integrity_check(ulpi_vp);
}
int ulpi_select_transceiver(struct ulpi_viewport *ulpi_vp, unsigned speed)
{
u32 tspeed = ULPI_FC_FULL_SPEED;
u32 val;
switch (speed) {
case ULPI_FC_HIGH_SPEED:
case ULPI_FC_FULL_SPEED:
case ULPI_FC_LOW_SPEED:
case ULPI_FC_FS4LS:
tspeed = speed;
break;
default:
printf("ULPI: %s: wrong transceiver speed specified: %u, "
"falling back to full speed\n", __func__, speed);
}
val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
if (val == ULPI_ERROR)
return val;
/* clear the previous speed setting */
val = (val & ~ULPI_FC_XCVRSEL_MASK) | tspeed;
return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
}
int ulpi_set_vbus(struct ulpi_viewport *ulpi_vp, int on, int ext_power)
{
u32 flags = ULPI_OTG_DRVVBUS;
u8 *reg = on ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
if (ext_power)
flags |= ULPI_OTG_DRVVBUS_EXT;
return ulpi_write(ulpi_vp, reg, flags);
}
int ulpi_set_vbus_indicator(struct ulpi_viewport *ulpi_vp, int external,
int passthu, int complement)
{
u32 flags, val;
u8 *reg;
reg = external ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
val = ulpi_write(ulpi_vp, reg, ULPI_OTG_EXTVBUSIND);
if (val)
return val;
flags = passthu ? ULPI_IFACE_PASSTHRU : 0;
flags |= complement ? ULPI_IFACE_EXTVBUS_COMPLEMENT : 0;
val = ulpi_read(ulpi_vp, &ulpi->iface_ctrl);
if (val == ULPI_ERROR)
return val;
val = val & ~(ULPI_IFACE_PASSTHRU & ULPI_IFACE_EXTVBUS_COMPLEMENT);
val |= flags;
val = ulpi_write(ulpi_vp, &ulpi->iface_ctrl, val);
if (val)
return val;
return 0;
}
int ulpi_set_pd(struct ulpi_viewport *ulpi_vp, int enable)
{
u32 val = ULPI_OTG_DP_PULLDOWN | ULPI_OTG_DM_PULLDOWN;
u8 *reg = enable ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
return ulpi_write(ulpi_vp, reg, val);
}
int ulpi_opmode_sel(struct ulpi_viewport *ulpi_vp, unsigned opmode)
{
u32 topmode = ULPI_FC_OPMODE_NORMAL;
u32 val;
switch (opmode) {
case ULPI_FC_OPMODE_NORMAL:
case ULPI_FC_OPMODE_NONDRIVING:
case ULPI_FC_OPMODE_DISABLE_NRZI:
case ULPI_FC_OPMODE_NOSYNC_NOEOP:
topmode = opmode;
break;
default:
printf("ULPI: %s: wrong OpMode specified: %u, "
"falling back to OpMode Normal\n", __func__, opmode);
}
val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
if (val == ULPI_ERROR)
return val;
/* clear the previous opmode setting */
val = (val & ~ULPI_FC_OPMODE_MASK) | topmode;
return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
}
int ulpi_serial_mode_enable(struct ulpi_viewport *ulpi_vp, unsigned smode)
{
switch (smode) {
case ULPI_IFACE_6_PIN_SERIAL_MODE:
case ULPI_IFACE_3_PIN_SERIAL_MODE:
break;
default:
printf("ULPI: %s: unrecognized Serial Mode specified: %u\n",
__func__, smode);
return ULPI_ERROR;
}
return ulpi_write(ulpi_vp, &ulpi->iface_ctrl_set, smode);
}
int ulpi_suspend(struct ulpi_viewport *ulpi_vp)
{
int err;
err = ulpi_write(ulpi_vp, &ulpi->function_ctrl_clear,
ULPI_FC_SUSPENDM);
if (err)
printf("ULPI: %s: failed writing the suspend bit\n", __func__);
return err;
}
/*
* Wait for ULPI PHY reset to complete.
* Actual wait for reset must be done in a view port specific way,
* because it involves checking the DIR line.
*/
static int __ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
{
u32 val;
int timeout = CFG_USB_ULPI_TIMEOUT;
/* Wait for the RESET bit to become zero */
while (--timeout) {
/*
* This function is generic and suppose to work
* with any viewport, so we cheat here and don't check
* for the error of ulpi_read(), if there is one, then
* there will be a timeout.
*/
val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
if (!(val & ULPI_FC_RESET))
return 0;
udelay(1);
}
printf("ULPI: %s: reset timed out\n", __func__);
return ULPI_ERROR;
}
int ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
__attribute__((weak, alias("__ulpi_reset_wait")));
int ulpi_reset(struct ulpi_viewport *ulpi_vp)
{
int err;
err = ulpi_write(ulpi_vp,
&ulpi->function_ctrl_set, ULPI_FC_RESET);
if (err) {
printf("ULPI: %s: failed writing reset bit\n", __func__);
return err;
}
return ulpi_reset_wait(ulpi_vp);
}
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