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Message-ID: <20200604161942.GK311@earth.li>
Date: Thu, 4 Jun 2020 17:19:42 +0100
From: Jonathan McDowell <noodles@...th.li>
To: Ansuel Smith <ansuelsmth@...il.com>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>,
Andy Gross <agross@...eaurora.org>,
Andy Gross <agross@...nel.org>,
Kishon Vijay Abraham I <kishon@...com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 1/2] phy: qualcomm: add qcom ipq806x dwc usb phy driver
On Wed, Jun 03, 2020 at 03:22:34PM +0200, Ansuel Smith wrote:
> This has lost in the original push for the dwc3 qcom driver.
> This is needed for ipq806x SoC as without this the usb ports
> doesn't work at all.
FWIW I tested this on my RB3011 so feel free to add:
Tested-by: Jonathan McDowell <noodles@...th.li>
One minor comment; would PHY_QCOM_USB_IPQ806X not be a better choice
than PHY_QCOM_IPQ806X_USB given the existing naming?
> Signed-off-by: Andy Gross <agross@...eaurora.org>
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
> v6:
> * Use GENMASK instead of hex value
> v4:
> * Add qcom to specific bindings
> v3:
> * Use reg instead of regmap phandle
> v2:
> * Renamed config from PHY_QCOM_DWC3 to PHY_QCOM_IPQ806X_USB
> * Rename inline function to generic name to reduce length
> * Fix check reported by checkpatch --strict
> * Rename compatible to qcom,ipq806x-usb-phy-(hs/ss)
>
> drivers/phy/qualcomm/Kconfig | 12 +
> drivers/phy/qualcomm/Makefile | 1 +
> drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c | 593 ++++++++++++++++++++
> 3 files changed, 606 insertions(+)
> create mode 100644 drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
>
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index e46824da29f6..9d41c3d12800 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -91,3 +91,15 @@ config PHY_QCOM_USB_HSIC
> select GENERIC_PHY
> help
> Support for the USB HSIC ULPI compliant PHY on QCOM chipsets.
> +
> +config PHY_QCOM_IPQ806X_USB
> + tristate "Qualcomm IPQ806x DWC3 USB PHY driver"
> + depends on ARCH_QCOM
> + depends on HAS_IOMEM
> + depends on OF
> + select GENERIC_PHY
> + help
> + This option enables support for the Synopsis PHYs present inside the
> + Qualcomm USB3.0 DWC3 controller on ipq806x SoC. This driver supports
> + both HS and SS PHY controllers.
> +
> diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
> index 283251d6a5d9..8629299c1495 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -10,3 +10,4 @@ obj-$(CONFIG_PHY_QCOM_UFS_14NM) += phy-qcom-ufs-qmp-14nm.o
> obj-$(CONFIG_PHY_QCOM_UFS_20NM) += phy-qcom-ufs-qmp-20nm.o
> obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o
> obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o
> +obj-$(CONFIG_PHY_QCOM_IPQ806X_USB) += phy-qcom-ipq806x-usb.o
> diff --git a/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c b/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> new file mode 100644
> index 000000000000..f37cd8760118
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> @@ -0,0 +1,593 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2014-2015, Code Aurora Forum. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +/* USB QSCRATCH Hardware registers */
> +#define QSCRATCH_GENERAL_CFG (0x08)
> +#define HSUSB_PHY_CTRL_REG (0x10)
> +
> +/* PHY_CTRL_REG */
> +#define HSUSB_CTRL_DMSEHV_CLAMP BIT(24)
> +#define HSUSB_CTRL_USB2_SUSPEND BIT(23)
> +#define HSUSB_CTRL_UTMI_CLK_EN BIT(21)
> +#define HSUSB_CTRL_UTMI_OTG_VBUS_VALID BIT(20)
> +#define HSUSB_CTRL_USE_CLKCORE BIT(18)
> +#define HSUSB_CTRL_DPSEHV_CLAMP BIT(17)
> +#define HSUSB_CTRL_COMMONONN BIT(11)
> +#define HSUSB_CTRL_ID_HV_CLAMP BIT(9)
> +#define HSUSB_CTRL_OTGSESSVLD_CLAMP BIT(8)
> +#define HSUSB_CTRL_CLAMP_EN BIT(7)
> +#define HSUSB_CTRL_RETENABLEN BIT(1)
> +#define HSUSB_CTRL_POR BIT(0)
> +
> +/* QSCRATCH_GENERAL_CFG */
> +#define HSUSB_GCFG_XHCI_REV BIT(2)
> +
> +/* USB QSCRATCH Hardware registers */
> +#define SSUSB_PHY_CTRL_REG (0x00)
> +#define SSUSB_PHY_PARAM_CTRL_1 (0x04)
> +#define SSUSB_PHY_PARAM_CTRL_2 (0x08)
> +#define CR_PROTOCOL_DATA_IN_REG (0x0c)
> +#define CR_PROTOCOL_DATA_OUT_REG (0x10)
> +#define CR_PROTOCOL_CAP_ADDR_REG (0x14)
> +#define CR_PROTOCOL_CAP_DATA_REG (0x18)
> +#define CR_PROTOCOL_READ_REG (0x1c)
> +#define CR_PROTOCOL_WRITE_REG (0x20)
> +
> +/* PHY_CTRL_REG */
> +#define SSUSB_CTRL_REF_USE_PAD BIT(28)
> +#define SSUSB_CTRL_TEST_POWERDOWN BIT(27)
> +#define SSUSB_CTRL_LANE0_PWR_PRESENT BIT(24)
> +#define SSUSB_CTRL_SS_PHY_EN BIT(8)
> +#define SSUSB_CTRL_SS_PHY_RESET BIT(7)
> +
> +/* SSPHY control registers - Does this need 0x30? */
> +#define SSPHY_CTRL_RX_OVRD_IN_HI(lane) (0x1006 + 0x100 * (lane))
> +#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 * (lane))
> +
> +/* SSPHY SoC version specific values */
> +#define SSPHY_RX_EQ_VALUE 4 /* Override value for rx_eq */
> +/* Override value for transmit preemphasis */
> +#define SSPHY_TX_DEEMPH_3_5DB 23
> +/* Override value for mpll */
> +#define SSPHY_MPLL_VALUE 0
> +
> +/* QSCRATCH PHY_PARAM_CTRL1 fields */
> +#define PHY_PARAM_CTRL1_TX_FULL_SWING_MASK GENMASK(26, 19)
> +#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK GENMASK(19, 13)
> +#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK GENMASK(13, 7)
> +#define PHY_PARAM_CTRL1_LOS_BIAS_MASK GENMASK(7, 2)
> +
> +#define PHY_PARAM_CTRL1_MASK \
> + (PHY_PARAM_CTRL1_TX_FULL_SWING_MASK | \
> + PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK | \
> + PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK | \
> + PHY_PARAM_CTRL1_LOS_BIAS_MASK)
> +
> +#define PHY_PARAM_CTRL1_TX_FULL_SWING(x) \
> + (((x) << 20) & PHY_PARAM_CTRL1_TX_FULL_SWING_MASK)
> +#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB(x) \
> + (((x) << 14) & PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK)
> +#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(x) \
> + (((x) << 8) & PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK)
> +#define PHY_PARAM_CTRL1_LOS_BIAS(x) \
> + (((x) << 3) & PHY_PARAM_CTRL1_LOS_BIAS_MASK)
> +
> +/* RX OVRD IN HI bits */
> +#define RX_OVRD_IN_HI_RX_RESET_OVRD BIT(13)
> +#define RX_OVRD_IN_HI_RX_RX_RESET BIT(12)
> +#define RX_OVRD_IN_HI_RX_EQ_OVRD BIT(11)
> +#define RX_OVRD_IN_HI_RX_EQ_MASK GENMASK(10, 7)
> +#define RX_OVRD_IN_HI_RX_EQ(x) ((x) << 8)
> +#define RX_OVRD_IN_HI_RX_EQ_EN_OVRD BIT(7)
> +#define RX_OVRD_IN_HI_RX_EQ_EN BIT(6)
> +#define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD BIT(5)
> +#define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK GENMASK(4, 2)
> +#define RX_OVRD_IN_HI_RX_RATE_OVRD BIT(2)
> +#define RX_OVRD_IN_HI_RX_RATE_MASK GENMASK(2, 0)
> +
> +/* TX OVRD DRV LO register bits */
> +#define TX_OVRD_DRV_LO_AMPLITUDE_MASK GENMASK(6, 0)
> +#define TX_OVRD_DRV_LO_PREEMPH_MASK GENMASK(13, 6)
> +#define TX_OVRD_DRV_LO_PREEMPH(x) ((x) << 7)
> +#define TX_OVRD_DRV_LO_EN BIT(14)
> +
> +/* MPLL bits */
> +#define SSPHY_MPLL_MASK GENMASK(8, 5)
> +#define SSPHY_MPLL(x) ((x) << 5)
> +
> +/* SS CAP register bits */
> +#define SS_CR_CAP_ADDR_REG BIT(0)
> +#define SS_CR_CAP_DATA_REG BIT(0)
> +#define SS_CR_READ_REG BIT(0)
> +#define SS_CR_WRITE_REG BIT(0)
> +
> +struct usb_phy {
> + void __iomem *base;
> + struct device *dev;
> + struct clk *xo_clk;
> + struct clk *ref_clk;
> + u32 rx_eq;
> + u32 tx_deamp_3_5db;
> + u32 mpll;
> +};
> +
> +struct phy_drvdata {
> + struct phy_ops ops;
> + u32 clk_rate;
> +};
> +
> +/**
> + * Write register and read back masked value to confirm it is written
> + *
> + * @base - QCOM DWC3 PHY base virtual address.
> + * @offset - register offset.
> + * @mask - register bitmask specifying what should be updated
> + * @val - value to write.
> + */
> +static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
> + u32 offset,
> + const u32 mask, u32 val)
> +{
> + u32 write_val, tmp = readl(phy_dwc3->base + offset);
> +
> + tmp &= ~mask; /* retain other bits */
> + write_val = tmp | val;
> +
> + writel(write_val, phy_dwc3->base + offset);
> +
> + /* Read back to see if val was written */
> + tmp = readl(phy_dwc3->base + offset);
> + tmp &= mask; /* clear other bits */
> +
> + if (tmp != val)
> + dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x FAILED\n",
> + val, offset);
> +}
> +
> +static int wait_for_latch(void __iomem *addr)
> +{
> + u32 retry = 10;
> +
> + while (true) {
> + if (!readl(addr))
> + break;
> +
> + if (--retry == 0)
> + return -ETIMEDOUT;
> +
> + usleep_range(10, 20);
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * Write SSPHY register
> + *
> + * @base - QCOM DWC3 PHY base virtual address.
> + * @addr - SSPHY address to write.
> + * @val - value to write.
> + */
> +static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
> + u32 addr, u32 val)
> +{
> + int ret;
> +
> + writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> + writel(SS_CR_CAP_ADDR_REG,
> + phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> + if (ret)
> + goto err_wait;
> +
> + writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> + writel(SS_CR_CAP_DATA_REG,
> + phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
> + if (ret)
> + goto err_wait;
> +
> + writel(SS_CR_WRITE_REG, phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
> +
> +err_wait:
> + if (ret)
> + dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
> + return ret;
> +}
> +
> +/**
> + * Read SSPHY register.
> + *
> + * @base - QCOM DWC3 PHY base virtual address.
> + * @addr - SSPHY address to read.
> + */
> +static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
> + u32 addr, u32 *val)
> +{
> + int ret;
> +
> + writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> + writel(SS_CR_CAP_ADDR_REG,
> + phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> + if (ret)
> + goto err_wait;
> +
> + /*
> + * Due to hardware bug, first read of SSPHY register might be
> + * incorrect. Hence as workaround, SW should perform SSPHY register
> + * read twice, but use only second read and ignore first read.
> + */
> + writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
> + if (ret)
> + goto err_wait;
> +
> + /* throwaway read */
> + readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
> +
> + writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
> +
> + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
> + if (ret)
> + goto err_wait;
> +
> + *val = readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
> +
> +err_wait:
> + return ret;
> +}
> +
> +static int qcom_ipq806x_usb_hs_phy_init(struct phy *phy)
> +{
> + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> + int ret;
> + u32 val;
> +
> + ret = clk_prepare_enable(phy_dwc3->xo_clk);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(phy_dwc3->ref_clk);
> + if (ret) {
> + clk_disable_unprepare(phy_dwc3->xo_clk);
> + return ret;
> + }
> +
> + /*
> + * HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
> + * enable clamping, and disable RETENTION (power-on default is ENABLED)
> + */
> + val = HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_DMSEHV_CLAMP |
> + HSUSB_CTRL_RETENABLEN | HSUSB_CTRL_COMMONONN |
> + HSUSB_CTRL_OTGSESSVLD_CLAMP | HSUSB_CTRL_ID_HV_CLAMP |
> + HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_UTMI_OTG_VBUS_VALID |
> + HSUSB_CTRL_UTMI_CLK_EN | HSUSB_CTRL_CLAMP_EN | 0x70;
> +
> + /* use core clock if external reference is not present */
> + if (!phy_dwc3->xo_clk)
> + val |= HSUSB_CTRL_USE_CLKCORE;
> +
> + writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
> + usleep_range(2000, 2200);
> +
> + /* Disable (bypass) VBUS and ID filters */
> + writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base + QSCRATCH_GENERAL_CFG);
> +
> + return 0;
> +}
> +
> +static int qcom_ipq806x_usb_hs_phy_exit(struct phy *phy)
> +{
> + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> +
> + clk_disable_unprepare(phy_dwc3->ref_clk);
> + clk_disable_unprepare(phy_dwc3->xo_clk);
> +
> + return 0;
> +}
> +
> +static int qcom_ipq806x_usb_ss_phy_init(struct phy *phy)
> +{
> + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> + int ret;
> + u32 data = 0;
> +
> + ret = clk_prepare_enable(phy_dwc3->xo_clk);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(phy_dwc3->ref_clk);
> + if (ret) {
> + clk_disable_unprepare(phy_dwc3->xo_clk);
> + return ret;
> + }
> +
> + /* reset phy */
> + data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> + writel(data | SSUSB_CTRL_SS_PHY_RESET,
> + phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> + usleep_range(2000, 2200);
> + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> +
> + /* clear REF_PAD if we don't have XO clk */
> + if (!phy_dwc3->xo_clk)
> + data &= ~SSUSB_CTRL_REF_USE_PAD;
> + else
> + data |= SSUSB_CTRL_REF_USE_PAD;
> +
> + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> +
> + /* wait for ref clk to become stable, this can take up to 30ms */
> + msleep(30);
> +
> + data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
> + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> +
> + /*
> + * 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 = usb_ss_read_phycreg(phy_dwc3, 0x102D, &data);
> + if (ret)
> + goto err_phy_trans;
> +
> + data |= (1 << 7);
> + ret = usb_ss_write_phycreg(phy_dwc3, 0x102D, data);
> + if (ret)
> + goto err_phy_trans;
> +
> + ret = usb_ss_read_phycreg(phy_dwc3, 0x1010, &data);
> + if (ret)
> + goto err_phy_trans;
> +
> + data &= ~0xff0;
> + data |= 0x20;
> + ret = usb_ss_write_phycreg(phy_dwc3, 0x1010, data);
> + if (ret)
> + goto err_phy_trans;
> +
> + /*
> + * 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 based on SoC version
> + * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
> + */
> + ret = usb_ss_read_phycreg(phy_dwc3,
> + SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
> + if (ret)
> + goto err_phy_trans;
> +
> + data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
> + data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
> + data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
> + data |= RX_OVRD_IN_HI_RX_EQ(phy_dwc3->rx_eq);
> + data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
> + ret = usb_ss_write_phycreg(phy_dwc3,
> + SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
> + if (ret)
> + goto err_phy_trans;
> +
> + /*
> + * Set EQ and TX launch amplitudes as follows
> + * LANE0.TX_OVRD_DRV_LO.PREEMPH set based on SoC version
> + * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 110
> + * LANE0.TX_OVRD_DRV_LO.EN set to 1.
> + */
> + ret = usb_ss_read_phycreg(phy_dwc3,
> + SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
> + if (ret)
> + goto err_phy_trans;
> +
> + data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
> + data |= TX_OVRD_DRV_LO_PREEMPH(phy_dwc3->tx_deamp_3_5db);
> + data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
> + data |= 0x6E;
> + data |= TX_OVRD_DRV_LO_EN;
> + ret = usb_ss_write_phycreg(phy_dwc3,
> + SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
> + if (ret)
> + goto err_phy_trans;
> +
> + data = 0;
> + data &= ~SSPHY_MPLL_MASK;
> + data |= SSPHY_MPLL(phy_dwc3->mpll);
> + usb_ss_write_phycreg(phy_dwc3, 0x30, data);
> +
> + /*
> + * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
> + * TX_FULL_SWING [26:20] amplitude to 110
> + * TX_DEEMPH_6DB [19:14] to 32
> + * TX_DEEMPH_3_5DB [13:8] set based on SoC version
> + * LOS_BIAS [7:3] to 9
> + */
> + data = readl(phy_dwc3->base + SSUSB_PHY_PARAM_CTRL_1);
> +
> + data &= ~PHY_PARAM_CTRL1_MASK;
> +
> + data |= PHY_PARAM_CTRL1_TX_FULL_SWING(0x6e) |
> + PHY_PARAM_CTRL1_TX_DEEMPH_6DB(0x20) |
> + PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(phy_dwc3->tx_deamp_3_5db) |
> + PHY_PARAM_CTRL1_LOS_BIAS(0x9);
> +
> + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
> + PHY_PARAM_CTRL1_MASK, data);
> +
> +err_phy_trans:
> + return ret;
> +}
> +
> +static int qcom_ipq806x_usb_ss_phy_exit(struct phy *phy)
> +{
> + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> +
> + /* Sequence to put SSPHY in low power state:
> + * 1. Clear REF_PHY_EN in PHY_CTRL_REG
> + * 2. Clear REF_USE_PAD in PHY_CTRL_REG
> + * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
> + */
> + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> + SSUSB_CTRL_SS_PHY_EN, 0x0);
> + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> + SSUSB_CTRL_REF_USE_PAD, 0x0);
> + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> + SSUSB_CTRL_TEST_POWERDOWN, 0x0);
> +
> + clk_disable_unprepare(phy_dwc3->ref_clk);
> + clk_disable_unprepare(phy_dwc3->xo_clk);
> +
> + return 0;
> +}
> +
> +static const struct phy_drvdata qcom_ipq806x_usb_hs_drvdata = {
> + .ops = {
> + .init = qcom_ipq806x_usb_hs_phy_init,
> + .exit = qcom_ipq806x_usb_hs_phy_exit,
> + .owner = THIS_MODULE,
> + },
> + .clk_rate = 60000000,
> +};
> +
> +static const struct phy_drvdata qcom_ipq806x_usb_ss_drvdata = {
> + .ops = {
> + .init = qcom_ipq806x_usb_ss_phy_init,
> + .exit = qcom_ipq806x_usb_ss_phy_exit,
> + .owner = THIS_MODULE,
> + },
> + .clk_rate = 125000000,
> +};
> +
> +static const struct of_device_id qcom_ipq806x_usb_phy_table[] = {
> + { .compatible = "qcom,ipq806x-usb-phy-hs",
> + .data = &qcom_ipq806x_usb_hs_drvdata },
> + { .compatible = "qcom,ipq806x-usb-phy-ss",
> + .data = &qcom_ipq806x_usb_ss_drvdata },
> + { /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, qcom_ipq806x_usb_phy_table);
> +
> +static int qcom_ipq806x_usb_phy_probe(struct platform_device *pdev)
> +{
> + struct usb_phy *phy_dwc3;
> + struct phy_provider *phy_provider;
> + struct phy *generic_phy;
> + const struct of_device_id *match;
> + const struct phy_drvdata *data;
> + struct resource *res;
> + resource_size_t size;
> + struct device_node *np;
> +
> + phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
> + if (!phy_dwc3)
> + return -ENOMEM;
> +
> + match = of_match_node(qcom_ipq806x_usb_phy_table, pdev->dev.of_node);
> + data = match->data;
> +
> + phy_dwc3->dev = &pdev->dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -EINVAL;
> + size = resource_size(res);
> + phy_dwc3->base = devm_ioremap(phy_dwc3->dev, res->start, size);
> +
> + if (IS_ERR(phy_dwc3->base)) {
> + dev_err(phy_dwc3->dev, "failed to map reg\n");
> + return PTR_ERR(phy_dwc3->base);
> + }
> +
> + phy_dwc3->ref_clk = devm_clk_get(phy_dwc3->dev, "ref");
> + if (IS_ERR(phy_dwc3->ref_clk)) {
> + dev_dbg(phy_dwc3->dev, "cannot get reference clock\n");
> + return PTR_ERR(phy_dwc3->ref_clk);
> + }
> +
> + clk_set_rate(phy_dwc3->ref_clk, data->clk_rate);
> +
> + phy_dwc3->xo_clk = devm_clk_get(phy_dwc3->dev, "xo");
> + if (IS_ERR(phy_dwc3->xo_clk)) {
> + dev_dbg(phy_dwc3->dev, "cannot get TCXO clock\n");
> + phy_dwc3->xo_clk = NULL;
> + }
> +
> + /* Parse device node to probe HSIO settings */
> + np = of_node_get(pdev->dev.of_node);
> + if (!of_compat_cmp(match->compatible, "qcom,ipq806x-usb-phy-ss",
> + strlen(match->compatible))) {
> + if (of_property_read_u32(np, "qcom,rx-eq", &phy_dwc3->rx_eq) ||
> + of_property_read_u32(np, "qcom,tx-deamp_3_5db",
> + &phy_dwc3->tx_deamp_3_5db) ||
> + of_property_read_u32(np, "qcom,mpll", &phy_dwc3->mpll)) {
> + dev_err(phy_dwc3->dev, "cannot get HSIO settings from device node, using default values\n");
> +
> + /* Default HSIO settings */
> + phy_dwc3->rx_eq = SSPHY_RX_EQ_VALUE;
> + phy_dwc3->tx_deamp_3_5db = SSPHY_TX_DEEMPH_3_5DB;
> + phy_dwc3->mpll = SSPHY_MPLL_VALUE;
> + }
> + }
> +
> + generic_phy = devm_phy_create(phy_dwc3->dev, pdev->dev.of_node,
> + &data->ops);
> +
> + if (IS_ERR(generic_phy))
> + return PTR_ERR(generic_phy);
> +
> + phy_set_drvdata(generic_phy, phy_dwc3);
> + platform_set_drvdata(pdev, phy_dwc3);
> +
> + phy_provider = devm_of_phy_provider_register(phy_dwc3->dev,
> + of_phy_simple_xlate);
> +
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
> +
> + return 0;
> +}
> +
> +static struct platform_driver qcom_ipq806x_usb_phy_driver = {
> + .probe = qcom_ipq806x_usb_phy_probe,
> + .driver = {
> + .name = "qcom-ipq806x-usb-phy",
> + .owner = THIS_MODULE,
> + .of_match_table = qcom_ipq806x_usb_phy_table,
> + },
> +};
> +
> +module_platform_driver(qcom_ipq806x_usb_phy_driver);
> +
> +MODULE_ALIAS("platform:phy-qcom-ipq806x-usb");
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Andy Gross <agross@...eaurora.org>");
> +MODULE_AUTHOR("Ivan T. Ivanov <iivanov@...sol.com>");
> +MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");
> --
> 2.25.1
J.
--
Hell is other people.
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