mpc83xx_serdes.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*
* base on the MPC83xx serdes initialization, which is
*
* Copyright 2007,2011 Freescale Semiconductor, Inc.
* Copyright (C) 2008 MontaVista Software, Inc.
*/
#include <common.h>
#include <dm.h>
#include <mapmem.h>
#include <misc.h>
#include "mpc83xx_serdes.h"
/**
* struct mpc83xx_serdes_priv - Private structure for MPC83xx serdes
* @regs: The device's register map
* @rfcks: Variable to keep the serdes reference clock selection set during
* initialization in (is or'd to every value written to SRDSCR4)
*/
struct mpc83xx_serdes_priv {
struct mpc83xx_serdes_regs *regs;
u32 rfcks;
};
/**
* setup_sata() - Configure the SerDes device to SATA mode
* @dev: The device to configure
*/
static void setup_sata(struct udevice *dev)
{
struct mpc83xx_serdes_priv *priv = dev_get_priv(dev);
/* Set and clear reset bits */
setbits_be32(&priv->regs->srdsrstctl, SRDSRSTCTL_SATA_RESET);
udelay(1000);
clrbits_be32(&priv->regs->srdsrstctl, SRDSRSTCTL_SATA_RESET);
/* Configure SRDSCR0 */
clrsetbits_be32(&priv->regs->srdscr0,
SRDSCR0_TXEQA_MASK | SRDSCR0_TXEQE_MASK,
SRDSCR0_TXEQA_SATA | SRDSCR0_TXEQE_SATA);
/* Configure SRDSCR1 */
clrbits_be32(&priv->regs->srdscr1, SRDSCR1_PLLBW);
/* Configure SRDSCR2 */
clrsetbits_be32(&priv->regs->srdscr2,
SRDSCR2_SEIC_MASK,
SRDSCR2_SEIC_SATA);
/* Configure SRDSCR3 */
out_be32(&priv->regs->srdscr3,
SRDSCR3_KFR_SATA | SRDSCR3_KPH_SATA |
SRDSCR3_SDFM_SATA_PEX | SRDSCR3_SDTXL_SATA);
/* Configure SRDSCR4 */
out_be32(&priv->regs->srdscr4, priv->rfcks | SRDSCR4_PROT_SATA);
}
/**
* setup_pex() - Configure the SerDes device to PCI Express mode
* @dev: The device to configure
* @type: The PCI Express type to configure for (x1 or x2)
*/
static void setup_pex(struct udevice *dev, enum pex_type type)
{
struct mpc83xx_serdes_priv *priv = dev_get_priv(dev);
/* Configure SRDSCR1 */
setbits_be32(&priv->regs->srdscr1, SRDSCR1_PLLBW);
/* Configure SRDSCR2 */
clrsetbits_be32(&priv->regs->srdscr2,
SRDSCR2_SEIC_MASK,
SRDSCR2_SEIC_PEX);
/* Configure SRDSCR3 */
out_be32(&priv->regs->srdscr3, SRDSCR3_SDFM_SATA_PEX);
/* Configure SRDSCR4 */
if (type == PEX_X2)
out_be32(&priv->regs->srdscr4,
priv->rfcks | SRDSCR4_PROT_PEX | SRDSCR4_PLANE_X2);
else
out_be32(&priv->regs->srdscr4,
priv->rfcks | SRDSCR4_PROT_PEX);
}
/**
* setup_sgmii() - Configure the SerDes device to SGMII mode
* @dev: The device to configure
*/
static void setup_sgmii(struct udevice *dev)
{
struct mpc83xx_serdes_priv *priv = dev_get_priv(dev);
/* Configure SRDSCR1 */
clrbits_be32(&priv->regs->srdscr1, SRDSCR1_PLLBW);
/* Configure SRDSCR2 */
clrsetbits_be32(&priv->regs->srdscr2,
SRDSCR2_SEIC_MASK,
SRDSCR2_SEIC_SGMII);
/* Configure SRDSCR3 */
out_be32(&priv->regs->srdscr3, 0);
/* Configure SRDSCR4 */
out_be32(&priv->regs->srdscr4, priv->rfcks | SRDSCR4_PROT_SGMII);
}
static int mpc83xx_serdes_probe(struct udevice *dev)
{
struct mpc83xx_serdes_priv *priv = dev_get_priv(dev);
bool vdd;
const char *proto;
priv->regs = map_sysmem(dev_read_addr(dev),
sizeof(struct mpc83xx_serdes_regs));
switch (dev_read_u32_default(dev, "serdes-clk", -1)) {
case 100:
priv->rfcks = SRDSCR4_RFCKS_100;
break;
case 125:
priv->rfcks = SRDSCR4_RFCKS_125;
break;
case 150:
priv->rfcks = SRDSCR4_RFCKS_150;
break;
default:
debug("%s: Could not read serdes clock value\n", dev->name);
return -EINVAL;
}
vdd = dev_read_bool(dev, "vdd");
/* 1.0V corevdd */
if (vdd) {
/* DPPE/DPPA = 0 */
clrbits_be32(&priv->regs->srdscr0, SRDSCR0_DPP_1V2);
/* VDD = 0 */
clrbits_be32(&priv->regs->srdscr0, SRDSCR2_VDD_1V2);
}
proto = dev_read_string(dev, "proto");
/* protocol specific configuration */
if (!strcmp(proto, "sata")) {
setup_sata(dev);
} else if (!strcmp(proto, "pex")) {
setup_pex(dev, PEX_X1);
} else if (!strcmp(proto, "pex-x2")) {
setup_pex(dev, PEX_X2);
} else if (!strcmp(proto, "sgmii")) {
setup_sgmii(dev);
} else {
debug("%s: Invalid protocol value %s\n", dev->name, proto);
return -EINVAL;
}
/* Do a software reset */
setbits_be32(&priv->regs->srdsrstctl, SRDSRSTCTL_RST);
return 0;
}
static const struct udevice_id mpc83xx_serdes_ids[] = {
{ .compatible = "fsl,mpc83xx-serdes" },
{ }
};
U_BOOT_DRIVER(mpc83xx_serdes) = {
.name = "mpc83xx_serdes",
.id = UCLASS_MISC,
.of_match = mpc83xx_serdes_ids,
.probe = mpc83xx_serdes_probe,
.priv_auto_alloc_size = sizeof(struct mpc83xx_serdes_priv),
};