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// SPDX-License-Identifier: GPL-2.0+
/*
* Amlogic AXG MIPI + PCIE analog PHY driver
*
* Copyright (C) 2019 Remi Pommarel <repk@triplefau.lt>
* Copyright (C) 2020 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/
#include <common.h>
#include <log.h>
#include <malloc.h>
#include <asm/io.h>
#include <bitfield.h>
#include <dm.h>
#include <errno.h>
#include <generic-phy.h>
#include <regmap.h>
#include <syscon.h>
#include <linux/delay.h>
#include <power/regulator.h>
#include <reset.h>
#include <clk.h>
#include <phy-mipi-dphy.h>
#include <linux/bitops.h>
#include <linux/compat.h>
#include <linux/bitfield.h>
#define HHI_MIPI_CNTL0 0x00
#define HHI_MIPI_CNTL0_COMMON_BLOCK GENMASK(31, 28)
#define HHI_MIPI_CNTL0_ENABLE BIT(29)
#define HHI_MIPI_CNTL0_BANDGAP BIT(26)
#define HHI_MIPI_CNTL0_DIF_REF_CTL1 GENMASK(25, 16)
#define HHI_MIPI_CNTL0_DIF_REF_CTL0 GENMASK(15, 0)
#define HHI_MIPI_CNTL1 0x04
#define HHI_MIPI_CNTL1_CH0_CML_PDR_EN BIT(12)
#define HHI_MIPI_CNTL1_LP_ABILITY GENMASK(5, 4)
#define HHI_MIPI_CNTL1_LP_RESISTER BIT(3)
#define HHI_MIPI_CNTL1_INPUT_SETTING BIT(2)
#define HHI_MIPI_CNTL1_INPUT_SEL BIT(1)
#define HHI_MIPI_CNTL1_PRBS7_EN BIT(0)
#define HHI_MIPI_CNTL2 0x08
#define HHI_MIPI_CNTL2_CH_PU GENMASK(31, 25)
#define HHI_MIPI_CNTL2_CH_CTL GENMASK(24, 19)
#define HHI_MIPI_CNTL2_CH0_DIGDR_EN BIT(18)
#define HHI_MIPI_CNTL2_CH_DIGDR_EN BIT(17)
#define HHI_MIPI_CNTL2_LPULPS_EN BIT(16)
#define HHI_MIPI_CNTL2_CH_EN GENMASK(15, 11)
#define HHI_MIPI_CNTL2_CH0_LP_CTL GENMASK(10, 1)
#define DSI_LANE_0 (1 << 4)
#define DSI_LANE_1 (1 << 3)
#define DSI_LANE_CLK (1 << 2)
#define DSI_LANE_2 (1 << 1)
#define DSI_LANE_3 (1 << 0)
#define DSI_LANE_MASK (0x1F)
struct phy_meson_axg_mipi_pcie_analog_priv {
struct regmap *regmap;
struct phy_configure_opts_mipi_dphy config;
bool dsi_configured;
bool dsi_enabled;
bool powered;
};
static void phy_bandgap_enable(struct phy_meson_axg_mipi_pcie_analog_priv *priv)
{
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_BANDGAP, HHI_MIPI_CNTL0_BANDGAP);
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_ENABLE, HHI_MIPI_CNTL0_ENABLE);
}
static void phy_bandgap_disable(struct phy_meson_axg_mipi_pcie_analog_priv *priv)
{
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_BANDGAP, 0);
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_ENABLE, 0);
}
static void phy_dsi_analog_enable(struct phy_meson_axg_mipi_pcie_analog_priv *priv)
{
u32 reg;
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_DIF_REF_CTL1,
FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0x1b8));
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
BIT(31), BIT(31));
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_DIF_REF_CTL0,
FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL0, 0x8));
regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x001e);
regmap_write(priv->regmap, HHI_MIPI_CNTL2,
(0x26e0 << 16) | (0x459 << 0));
reg = DSI_LANE_CLK;
switch (priv->config.lanes) {
case 4:
reg |= DSI_LANE_3;
fallthrough;
case 3:
reg |= DSI_LANE_2;
fallthrough;
case 2:
reg |= DSI_LANE_1;
fallthrough;
case 1:
reg |= DSI_LANE_0;
break;
default:
reg = 0;
}
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL2,
HHI_MIPI_CNTL2_CH_EN,
FIELD_PREP(HHI_MIPI_CNTL2_CH_EN, reg));
priv->dsi_enabled = true;
}
static void phy_dsi_analog_disable(struct phy_meson_axg_mipi_pcie_analog_priv *priv)
{
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_DIF_REF_CTL1,
FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0));
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, BIT(31), 0);
regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
HHI_MIPI_CNTL0_DIF_REF_CTL1, 0);
regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x6);
regmap_write(priv->regmap, HHI_MIPI_CNTL2, 0x00200000);
priv->dsi_enabled = false;
}
static int phy_meson_axg_mipi_pcie_analog_configure(struct phy *phy, void *params)
{
struct udevice *dev = phy->dev;
struct phy_meson_axg_mipi_pcie_analog_priv *priv = dev_get_priv(dev);
struct phy_configure_opts_mipi_dphy *config = params;
int ret;
ret = phy_mipi_dphy_config_validate(config);
if (ret)
return ret;
memcpy(&priv->config, config, sizeof(priv->config));
priv->dsi_configured = true;
/* If PHY was already powered on, setup the DSI analog part */
if (priv->powered) {
/* If reconfiguring, disable & reconfigure */
if (priv->dsi_enabled)
phy_dsi_analog_disable(priv);
udelay(100);
phy_dsi_analog_enable(priv);
}
return 0;
}
static int phy_meson_axg_mipi_pcie_analog_power_on(struct phy *phy)
{
struct udevice *dev = phy->dev;
struct phy_meson_axg_mipi_pcie_analog_priv *priv = dev_get_priv(dev);
phy_bandgap_enable(priv);
if (priv->dsi_configured)
phy_dsi_analog_enable(priv);
priv->powered = true;
return 0;
}
static int phy_meson_axg_mipi_pcie_analog_power_off(struct phy *phy)
{
struct udevice *dev = phy->dev;
struct phy_meson_axg_mipi_pcie_analog_priv *priv = dev_get_priv(dev);
phy_bandgap_disable(priv);
if (priv->dsi_enabled)
phy_dsi_analog_disable(priv);
priv->powered = false;
return 0;
}
struct phy_ops meson_axg_mipi_pcie_analog_ops = {
.power_on = phy_meson_axg_mipi_pcie_analog_power_on,
.power_off = phy_meson_axg_mipi_pcie_analog_power_off,
.configure = phy_meson_axg_mipi_pcie_analog_configure,
};
int meson_axg_mipi_pcie_analog_probe(struct udevice *dev)
{
struct phy_meson_axg_mipi_pcie_analog_priv *priv = dev_get_priv(dev);
priv->regmap = syscon_node_to_regmap(dev_ofnode(dev_get_parent(dev)));
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
return 0;
}
static const struct udevice_id meson_axg_mipi_pcie_analog_ids[] = {
{ .compatible = "amlogic,axg-mipi-pcie-analog-phy" },
{ }
};
U_BOOT_DRIVER(meson_axg_mipi_pcie_analog) = {
.name = "meson_axg_mipi_pcie_analog",
.id = UCLASS_PHY,
.of_match = meson_axg_mipi_pcie_analog_ids,
.probe = meson_axg_mipi_pcie_analog_probe,
.ops = &meson_axg_mipi_pcie_analog_ops,
.priv_auto = sizeof(struct phy_meson_axg_mipi_pcie_analog_priv),
};
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