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-rw-r--r--drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
new file mode 100644
index 000000000..a3e1108b7
--- /dev/null
+++ b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Amlogic AXG MIPI + PCIE analog PHY driver
+ *
+ * Copyright (C) 2019 Remi Pommarel <repk@triplefau.lt>
+ */
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.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_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 BIT(4)
+#define DSI_LANE_1 BIT(3)
+#define DSI_LANE_CLK BIT(2)
+#define DSI_LANE_2 BIT(1)
+#define DSI_LANE_3 BIT(0)
+
+struct phy_axg_mipi_pcie_analog_priv {
+ struct phy *phy;
+ struct regmap *regmap;
+ bool dsi_configured;
+ bool dsi_enabled;
+ bool powered;
+ struct phy_configure_opts_mipi_dphy config;
+};
+
+static void phy_bandgap_enable(struct phy_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_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_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_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_axg_mipi_pcie_analog_configure(struct phy *phy,
+ union phy_configure_opts *opts)
+{
+ struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
+ int ret;
+
+ ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
+ if (ret)
+ return ret;
+
+ memcpy(&priv->config, opts, 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);
+
+ usleep_range(100, 200);
+
+ phy_dsi_analog_enable(priv);
+ }
+
+ return 0;
+}
+
+static int phy_axg_mipi_pcie_analog_power_on(struct phy *phy)
+{
+ struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
+
+ phy_bandgap_enable(priv);
+
+ if (priv->dsi_configured)
+ phy_dsi_analog_enable(priv);
+
+ priv->powered = true;
+
+ 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);
+
+ phy_bandgap_disable(priv);
+
+ if (priv->dsi_enabled)
+ phy_dsi_analog_disable(priv);
+
+ priv->powered = false;
+
+ return 0;
+}
+
+static const struct phy_ops phy_axg_mipi_pcie_analog_ops = {
+ .configure = phy_axg_mipi_pcie_analog_configure,
+ .power_on = phy_axg_mipi_pcie_analog_power_on,
+ .power_off = phy_axg_mipi_pcie_analog_power_off,
+ .owner = THIS_MODULE,
+};
+
+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, *parent_np;
+ struct regmap *map;
+ int ret;
+
+ priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* Get the hhi system controller node */
+ parent_np = of_get_parent(dev->of_node);
+ map = syscon_node_to_regmap(parent_np);
+ of_node_put(parent_np);
+ 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, of_phy_simple_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");