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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>
*/
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <dt-bindings/phy/phy.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_DECODE_TO_RTERM GENMASK(15, 12)
#define HHI_MIPI_CNTL0_OUTPUT_EN BIT(3)
#define HHI_MIPI_CNTL1 0x01
#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 0x02
#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(n) BIT(15 - (n))
#define HHI_MIPI_CNTL2_CH0_LP_CTL GENMASK(10, 1)
struct phy_axg_mipi_pcie_analog_priv {
struct phy *phy;
unsigned int mode;
struct regmap *regmap;
};
static const struct regmap_config phy_axg_mipi_pcie_analog_regmap_conf = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 4,
.max_register = HHI_MIPI_CNTL2,
};
static int phy_axg_mipi_pcie_analog_power_on(struct phy *phy)
{
struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
/* MIPI not supported yet */
if (priv->mode != PHY_TYPE_PCIE)
return -EINVAL;
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);
return 0;
}
static int phy_axg_mipi_pcie_analog_power_off(struct phy *phy)
{
struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
/* MIPI not supported yet */
if (priv->mode != PHY_TYPE_PCIE)
return -EINVAL;
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);
return 0;
}
static int phy_axg_mipi_pcie_analog_init(struct phy *phy)
{
return 0;
}
static int phy_axg_mipi_pcie_analog_exit(struct phy *phy)
{
return 0;
}
static const struct phy_ops phy_axg_mipi_pcie_analog_ops = {
.init = phy_axg_mipi_pcie_analog_init,
.exit = phy_axg_mipi_pcie_analog_exit,
.power_on = phy_axg_mipi_pcie_analog_power_on,
.power_off = phy_axg_mipi_pcie_analog_power_off,
.owner = THIS_MODULE,
};
static struct phy *phy_axg_mipi_pcie_analog_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct phy_axg_mipi_pcie_analog_priv *priv = dev_get_drvdata(dev);
unsigned int mode;
if (args->args_count != 1) {
dev_err(dev, "invalid number of arguments\n");
return ERR_PTR(-EINVAL);
}
mode = args->args[0];
/* MIPI mode is not supported yet */
if (mode != PHY_TYPE_PCIE) {
dev_err(dev, "invalid phy mode select argument\n");
return ERR_PTR(-EINVAL);
}
priv->mode = mode;
return priv->phy;
}
static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
{
struct phy_provider *phy;
struct device *dev = &pdev->dev;
struct phy_axg_mipi_pcie_analog_priv *priv;
struct device_node *np = dev->of_node;
struct regmap *map;
struct resource *res;
void __iomem *base;
int ret;
priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {
dev_err(dev, "failed to get regmap base\n");
return PTR_ERR(base);
}
map = devm_regmap_init_mmio(dev, base,
&phy_axg_mipi_pcie_analog_regmap_conf);
if (IS_ERR(map)) {
dev_err(dev, "failed to get HHI regmap\n");
return PTR_ERR(map);
}
priv->regmap = map;
priv->phy = devm_phy_create(dev, np, &phy_axg_mipi_pcie_analog_ops);
if (IS_ERR(priv->phy)) {
ret = PTR_ERR(priv->phy);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to create PHY\n");
return ret;
}
phy_set_drvdata(priv->phy, priv);
dev_set_drvdata(dev, priv);
phy = devm_of_phy_provider_register(dev,
phy_axg_mipi_pcie_analog_xlate);
return PTR_ERR_OR_ZERO(phy);
}
static const struct of_device_id phy_axg_mipi_pcie_analog_of_match[] = {
{
.compatible = "amlogic,axg-mipi-pcie-analog-phy",
},
{ },
};
MODULE_DEVICE_TABLE(of, phy_axg_mipi_pcie_analog_of_match);
static struct platform_driver phy_axg_mipi_pcie_analog_driver = {
.probe = phy_axg_mipi_pcie_analog_probe,
.driver = {
.name = "phy-axg-mipi-pcie-analog",
.of_match_table = phy_axg_mipi_pcie_analog_of_match,
},
};
module_platform_driver(phy_axg_mipi_pcie_analog_driver);
MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
MODULE_DESCRIPTION("Amlogic AXG MIPI + PCIE analog PHY driver");
MODULE_LICENSE("GPL v2");
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