// SPDX-License-Identifier: GPL-2.0-only
/*
* HDMI PHY
*
* Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include "omapdss.h"
#include "dss.h"
#include "hdmi.h"
void hdmi_phy_dump(
struct hdmi_phy_data *phy,
struct seq_file *s)
{
#define DUMPPHY(r) seq_printf(s,
"%-35s %08x\n",
#r,\
hdmi_read_reg(phy->base, r))
DUMPPHY(HDMI_TXPHY_TX_CTRL);
DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
DUMPPHY(HDMI_TXPHY_POWER_CTRL);
DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
if (phy->features->bist_ctrl)
DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
}
int hdmi_phy_parse_lanes(
struct hdmi_phy_data *phy,
const u32 *lanes)
{
int i;
for (i =
0; i <
8; i +=
2) {
u8 lane, pol;
int dx, dy;
dx = lanes[i];
dy = lanes[i +
1];
if (dx <
0 || dx >=
8)
return -EINVAL;
if (dy <
0 || dy >=
8)
return -EINVAL;
if (dx &
1) {
if (dy != dx -
1)
return -EINVAL;
pol =
1;
}
else {
if (dy != dx +
1)
return -EINVAL;
pol =
0;
}
lane = dx /
2;
phy->lane_function[lane] = i /
2;
phy->lane_polarity[lane] = pol;
}
return 0;
}
static void hdmi_phy_configure_lanes(
struct hdmi_phy_data *phy)
{
static const u16 pad_cfg_list[] = {
0x0123,
0x0132,
0x0312,
0x0321,
0x0231,
0x0213,
0x1023,
0x1032,
0x3012,
0x3021,
0x2031,
0x2013,
0x1203,
0x1302,
0x3102,
0x3201,
0x2301,
0x2103,
0x1230,
0x1320,
0x3120,
0x3210,
0x2310,
0x2130,
};
u16 lane_cfg =
0;
int i;
unsigned int lane_cfg_val;
u16 pol_val =
0;
for (i =
0; i <
4; ++i)
lane_cfg |= phy->lane_function[i] << ((
3 - i) *
4);
pol_val |= phy->lane_polarity[
0] <<
0;
pol_val |= phy->lane_polarity[
1] <<
3;
pol_val |= phy->lane_polarity[
2] <<
2;
pol_val |= phy->lane_polarity[
3] <<
1;
for (i =
0; i < ARRAY_SIZE(pad_cfg_list); ++i)
if (pad_cfg_list[i] == lane_cfg)
break;
if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
i =
0;
lane_cfg_val = i;
REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val,
26,
22);
REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val,
30,
27);
}
int hdmi_phy_configure(
struct hdmi_phy_data *phy,
unsigned long hfbitclk,
unsigned long lfbitclk)
{
u8 freqout;
/*
* Read address 0 in order to get the SCP reset done completed
* Dummy access performed to make sure reset is done
*/
hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
/*
* In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
* HDMI_PHYPWRCMD_LDOON command.
*/
if (phy->features->bist_ctrl)
REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL,
1,
11,
11);
/*
* If the hfbitclk != lfbitclk, it means the lfbitclk was configured
* to be used for TMDS.
*/
if (hfbitclk != lfbitclk)
freqout =
0;
else if (hfbitclk /
10 < phy->features->max_phy)
freqout =
1;
else
freqout =
2;
/*
* Write to phy address 0 to configure the clock
* use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
*/
REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout,
31,
30);
/* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL,
0xF0000000);
/* Setup max LDO voltage */
if (phy->features->ldo_voltage)
REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL,
0xB,
3,
0);
hdmi_phy_configure_lanes(phy);
return 0;
}
static const struct hdmi_phy_features omap44xx_phy_feats = {
.bist_ctrl =
false,
.ldo_voltage =
true,
.max_phy =
185675000,
};
static const struct hdmi_phy_features omap54xx_phy_feats = {
.bist_ctrl =
true,
.ldo_voltage =
false,
.max_phy =
186000000,
};
int hdmi_phy_init(
struct platform_device *pdev,
struct hdmi_phy_data *phy,
unsigned int version)
{
if (version ==
4)
phy->features = &omap44xx_phy_feats;
else
phy->features = &omap54xx_phy_feats;
phy->base = devm_platform_ioremap_resource_byname(pdev,
"phy");
if (IS_ERR(phy->base))
return PTR_ERR(phy->base);
return 0;
}