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path: root/drivers/phy/meson-g12a-usb3-pcie.c
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Diffstat (limited to 'drivers/phy/meson-g12a-usb3-pcie.c')
-rw-r--r--drivers/phy/meson-g12a-usb3-pcie.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/drivers/phy/meson-g12a-usb3-pcie.c b/drivers/phy/meson-g12a-usb3-pcie.c
new file mode 100644
index 0000000000..920675dc99
--- /dev/null
+++ b/drivers/phy/meson-g12a-usb3-pcie.c
@@ -0,0 +1,345 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Meson G12A USB3+PCIE Combo PHY driver
+ *
+ * Copyright (C) 2018 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2019 BayLibre, SAS
+ * Author: Neil Armstrong <narmstron@baylibre.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <regmap.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <reset.h>
+#include <bitfield.h>
+#include <generic-phy.h>
+
+#include <linux/bitops.h>
+#include <linux/compat.h>
+#include <linux/bitfield.h>
+
+#define PHY_R0 0x00
+ #define PHY_R0_PCIE_POWER_STATE GENMASK(4, 0)
+ #define PHY_R0_PCIE_USB3_SWITCH GENMASK(6, 5)
+
+#define PHY_R1 0x04
+ #define PHY_R1_PHY_TX1_TERM_OFFSET GENMASK(4, 0)
+ #define PHY_R1_PHY_TX0_TERM_OFFSET GENMASK(9, 5)
+ #define PHY_R1_PHY_RX1_EQ GENMASK(12, 10)
+ #define PHY_R1_PHY_RX0_EQ GENMASK(15, 13)
+ #define PHY_R1_PHY_LOS_LEVEL GENMASK(20, 16)
+ #define PHY_R1_PHY_LOS_BIAS GENMASK(23, 21)
+ #define PHY_R1_PHY_REF_CLKDIV2 BIT(24)
+ #define PHY_R1_PHY_MPLL_MULTIPLIER GENMASK(31, 25)
+
+#define PHY_R2 0x08
+ #define PHY_R2_PCS_TX_DEEMPH_GEN2_6DB GENMASK(5, 0)
+ #define PHY_R2_PCS_TX_DEEMPH_GEN2_3P5DB GENMASK(11, 6)
+ #define PHY_R2_PCS_TX_DEEMPH_GEN1 GENMASK(17, 12)
+ #define PHY_R2_PHY_TX_VBOOST_LVL GENMASK(20, 18)
+
+#define PHY_R4 0x10
+ #define PHY_R4_PHY_CR_WRITE BIT(0)
+ #define PHY_R4_PHY_CR_READ BIT(1)
+ #define PHY_R4_PHY_CR_DATA_IN GENMASK(17, 2)
+ #define PHY_R4_PHY_CR_CAP_DATA BIT(18)
+ #define PHY_R4_PHY_CR_CAP_ADDR BIT(19)
+
+#define PHY_R5 0x14
+ #define PHY_R5_PHY_CR_DATA_OUT GENMASK(15, 0)
+ #define PHY_R5_PHY_CR_ACK BIT(16)
+ #define PHY_R5_PHY_BS_OUT BIT(17)
+
+struct phy_g12a_usb3_pcie_priv {
+ struct regmap *regmap;
+#if CONFIG_IS_ENABLED(CLK)
+ struct clk clk;
+#endif
+ struct reset_ctl_bulk resets;
+};
+
+static int phy_g12a_usb3_pcie_cr_bus_addr(struct phy_g12a_usb3_pcie_priv *priv,
+ unsigned int addr)
+{
+ unsigned int val, reg;
+ int ret;
+
+ reg = FIELD_PREP(PHY_R4_PHY_CR_DATA_IN, addr);
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_CAP_ADDR);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ !(val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int
+phy_g12a_usb3_pcie_cr_bus_read(struct phy_g12a_usb3_pcie_priv *priv,
+ unsigned int addr, unsigned int *data)
+{
+ unsigned int val;
+ int ret;
+
+ ret = phy_g12a_usb3_pcie_cr_bus_addr(priv, addr);
+ if (ret)
+ return ret;
+
+ regmap_write(priv->regmap, PHY_R4, 0);
+ regmap_write(priv->regmap, PHY_R4, PHY_R4_PHY_CR_READ);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ *data = FIELD_GET(PHY_R5_PHY_CR_DATA_OUT, val);
+
+ regmap_write(priv->regmap, PHY_R4, 0);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ !(val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int
+phy_g12a_usb3_pcie_cr_bus_write(struct phy_g12a_usb3_pcie_priv *priv,
+ unsigned int addr, unsigned int data)
+{
+ unsigned int val, reg;
+ int ret;
+
+ ret = phy_g12a_usb3_pcie_cr_bus_addr(priv, addr);
+ if (ret)
+ return ret;
+
+ reg = FIELD_PREP(PHY_R4_PHY_CR_DATA_IN, data);
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_CAP_DATA);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK) == 0,
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ regmap_write(priv->regmap, PHY_R4, reg | PHY_R4_PHY_CR_WRITE);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK),
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ regmap_write(priv->regmap, PHY_R4, reg);
+
+ ret = regmap_read_poll_timeout(priv->regmap, PHY_R5, val,
+ (val & PHY_R5_PHY_CR_ACK) == 0,
+ 5, 1000);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int
+phy_g12a_usb3_pcie_cr_bus_update_bits(struct phy_g12a_usb3_pcie_priv *priv,
+ uint offset, uint mask, uint val)
+{
+ uint reg;
+ int ret;
+
+ ret = phy_g12a_usb3_pcie_cr_bus_read(priv, offset, &reg);
+ if (ret)
+ return ret;
+
+ reg &= ~mask;
+
+ return phy_g12a_usb3_pcie_cr_bus_write(priv, offset, reg | val);
+}
+
+static int phy_meson_g12a_usb3_init(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_g12a_usb3_pcie_priv *priv = dev_get_priv(dev);
+ unsigned int data;
+ int ret;
+
+ /* TOFIX Handle PCIE mode */
+
+ ret = reset_assert_bulk(&priv->resets);
+ udelay(1);
+ ret |= reset_deassert_bulk(&priv->resets);
+ if (ret)
+ return ret;
+
+ /* Switch PHY to USB3 */
+ regmap_update_bits(priv->regmap, PHY_R0,
+ PHY_R0_PCIE_USB3_SWITCH,
+ PHY_R0_PCIE_USB3_SWITCH);
+
+ /*
+ * WORKAROUND: There is SSPHY suspend bug due to
+ * which USB enumerates
+ * in HS mode instead of SS mode. Workaround it by asserting
+ * LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus
+ * mode
+ */
+ ret = phy_g12a_usb3_pcie_cr_bus_update_bits(priv, 0x102d,
+ BIT(7), BIT(7));
+ if (ret)
+ return ret;
+
+ ret = phy_g12a_usb3_pcie_cr_bus_update_bits(priv, 0x1010, 0xff0, 20);
+ if (ret)
+ return ret;
+
+ /*
+ * Fix RX Equalization setting as follows
+ * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
+ * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
+ * LANE0.RX_OVRD_IN_HI.RX_EQ set to 3
+ * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
+ */
+ ret = phy_g12a_usb3_pcie_cr_bus_read(priv, 0x1006, &data);
+ if (ret)
+ return ret;
+
+ data &= ~BIT(6);
+ data |= BIT(7);
+ data &= ~(0x7 << 8);
+ data |= (0x3 << 8);
+ data |= (1 << 11);
+ ret = phy_g12a_usb3_pcie_cr_bus_write(priv, 0x1006, data);
+ if (ret)
+ return ret;
+
+ /*
+ * Set EQ and TX launch amplitudes as follows
+ * LANE0.TX_OVRD_DRV_LO.PREEMPH set to 22
+ * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 127
+ * LANE0.TX_OVRD_DRV_LO.EN set to 1.
+ */
+ ret = phy_g12a_usb3_pcie_cr_bus_read(priv, 0x1002, &data);
+ if (ret)
+ return ret;
+
+ data &= ~0x3f80;
+ data |= (0x16 << 7);
+ data &= ~0x7f;
+ data |= (0x7f | BIT(14));
+ ret = phy_g12a_usb3_pcie_cr_bus_write(priv, 0x1002, data);
+ if (ret)
+ return ret;
+
+ /*
+ * MPLL_LOOP_CTL.PROP_CNTRL = 8
+ */
+ ret = phy_g12a_usb3_pcie_cr_bus_update_bits(priv, 0x30,
+ 0xf << 4, 8 << 4);
+ if (ret)
+ return ret;
+
+ regmap_update_bits(priv->regmap, PHY_R2,
+ PHY_R2_PHY_TX_VBOOST_LVL,
+ FIELD_PREP(PHY_R2_PHY_TX_VBOOST_LVL, 0x4));
+
+ regmap_update_bits(priv->regmap, PHY_R1,
+ PHY_R1_PHY_LOS_BIAS | PHY_R1_PHY_LOS_LEVEL,
+ FIELD_PREP(PHY_R1_PHY_LOS_BIAS, 4) |
+ FIELD_PREP(PHY_R1_PHY_LOS_LEVEL, 9));
+
+ return ret;
+}
+
+static int phy_meson_g12a_usb3_exit(struct phy *phy)
+{
+ struct phy_g12a_usb3_pcie_priv *priv = dev_get_priv(phy->dev);
+
+ return reset_assert_bulk(&priv->resets);
+}
+
+struct phy_ops meson_g12a_usb3_pcie_phy_ops = {
+ .init = phy_meson_g12a_usb3_init,
+ .exit = phy_meson_g12a_usb3_exit,
+};
+
+int meson_g12a_usb3_pcie_phy_probe(struct udevice *dev)
+{
+ struct phy_g12a_usb3_pcie_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
+ if (ret)
+ return ret;
+
+ ret = reset_get_bulk(dev, &priv->resets);
+ if (ret == -ENOTSUPP)
+ return 0;
+ else if (ret)
+ return ret;
+
+#if CONFIG_IS_ENABLED(CLK)
+ ret = clk_get_by_index(dev, 0, &priv->clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&priv->clk);
+ if (ret && ret != -ENOENT && ret != -ENOTSUPP) {
+ pr_err("failed to enable PHY clock\n");
+ clk_free(&priv->clk);
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+
+static const struct udevice_id meson_g12a_usb3_pcie_phy_ids[] = {
+ { .compatible = "amlogic,g12a-usb3-pcie-phy" },
+ { }
+};
+
+U_BOOT_DRIVER(meson_g12a_usb3_pcie_phy) = {
+ .name = "meson_g12a_usb3_pcie_phy",
+ .id = UCLASS_PHY,
+ .of_match = meson_g12a_usb3_pcie_phy_ids,
+ .probe = meson_g12a_usb3_pcie_phy_probe,
+ .ops = &meson_g12a_usb3_pcie_phy_ops,
+ .priv_auto_alloc_size = sizeof(struct phy_g12a_usb3_pcie_priv),
+};
generated by cgit (git 2.34.1) at 2024-12-28 09:22:24 +0000