Re: [PATCH 2/2] phy: qcom-qmp: new qmp phy driver for qcom-chipsets
From: Vivek Gautam
Date: Wed Nov 02 2016 - 03:26:42 EST
Hi Srini,
On Wed, Oct 26, 2016 at 7:27 PM, Srinivas Kandagatla
<srinivas.kandagatla@xxxxxxxxxx> wrote:
> Hi Vivek,
>
> Thanks for consolidating qmp phy support for both usb and pcie.
On vacation, so responses are bit late. Please bear with me.
>
> On 19/10/16 11:43, Vivek Gautam wrote:
>>
>> Qualcomm SOCs have QMP phy controller that provides support
>> to a number of controller, viz. PCIe, UFS, and USB.
>> Add a new driver, based on generic phy framework, for this
>> phy controller.
>>
>> USB3-phy changes: Based on phy-msm-ssusb-qmp driver available on
>> msm-4.4 kernel @codeaurora[1].
>> PCIe-phy changes: Based on msm8996-pcie-phy driver posted by
>> Srinivas [2].
>>
>> [1]
>> https://source.codeaurora.org/quic/la/kernel/msm-4.4/log/?h=caf/3.18/msm-3.18
>> [2] https://patchwork.kernel.org/patch/9318947/
>>
>> Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
>> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
>
>
> very few minor nits which needs fixing in next version.
>
> I have tested this patch on DB820c PCIE with ethernet and SATA ports.
>
> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Thanks for testing the patch.
>
>
>> ---
>> .../devicetree/bindings/phy/qcom-qmp-phy.txt | 61 ++
>> drivers/phy/Kconfig | 8 +
>> drivers/phy/Makefile | 1 +
>> drivers/phy/phy-qcom-qmp.c | 1154
>> ++++++++++++++++++++
>> 4 files changed, 1224 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> create mode 100644 drivers/phy/phy-qcom-qmp.c
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> new file mode 100644
>> index 0000000..90214aa
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>> @@ -0,0 +1,61 @@
>> +Qualcomm QMP PHY
>> +----------------
>> +
>> +QMP phy controller supports physical layer functionality for a number of
>> +controllers on Qualcomm chipsets, such as, PCIe, UFS, and USB.
>> +
>> +Required properties:
>> + - compatible: compatible list, contains:
>> + "qcom,msm8996-qmp-pcie-phy" for 14nm PCIe phy on msm8996,
>> + "qcom,msm8996-qmp-usb3-phy" for 14nm USB3 phy on msm8996.
>> + - reg: offset and length of the PHY register set.
>> + - #phy-cells: must be 1
>> + - Cell after phy phandle should be the port (lane) number.
>> + - clocks: a list of phandles and clock-specifier pairs,
>> + one for each entry in clock-names.
>> + - clock-names: must be "cfg_ahb" for phy config clock,
>> + "aux" for phy aux clock,
>> + "ref_clk" for 19.2 MHz ref clk,
>> + "ref_clk_src" for reference clock source,
>> + "pipe<port-number>" for pipe clock specific to
>> + each port/lane (Optional).
>
>
>> + - resets: a list of phandles and reset controller specifier pairs,
>> + one for each entry in reset-names.
>> + - reset-names: must be "phy" for reset of phy block,
>> + "common" for phy common block reset,
>> + "cfg" for phy's ahb cfg block reset (Optional).
>> + "port<port-number>" for reset specific to
>> + each port/lane. (Optional)
>> + - vdda-phy-supply: Phandle to a regulator supply to PHY core block.
>> + - vdda-pll-supply: Phandle to 1.8V regulator supply to PHY refclk pll
>> block.
>> +
>> +Optional properties:
>> + - vddp-ref-clk-supply: Phandle to a regulator supply to any specific
>> refclk
>> + pll block.
>> +
>> +Example:
>> + pcie_phy: pciephy@34000 {
>> + compatible = "qcom,qmp-14nm-pcie-phy";
>
>
> Fix this according to the compatibilities listed above.
Sure, will fix this.
>
>
>> + reg = <0x034000 0x3fff>;
>> + #phy-cells = <1>;
>> +
>> + clocks = <&gcc GCC_PCIE_PHY_AUX_CLK>,
>> + <&gcc GCC_PCIE_PHY_CFG_AHB_CLK>,
>> + <&gcc GCC_PCIE_0_PIPE_CLK>,
>> + <&gcc GCC_PCIE_1_PIPE_CLK>,
>> + <&gcc GCC_PCIE_2_PIPE_CLK>;
>> + clock-names = "aux", "cfg_ahb",
>> + "pipe0", "pipe1", "pipe2";
>> +
>> + vdda-phy-supply = <&pm8994_l28>;
>> + vdda-pll-supply = <&pm8994_l12>;
>> +
>> + resets = <&gcc GCC_PCIE_PHY_BCR>,
>> + <&gcc GCC_PCIE_PHY_COM_BCR>,
>> + <&gcc GCC_PCIE_PHY_COM_NOCSR_BCR>,
>> + <&gcc GCC_PCIE_0_PHY_BCR>,
>> + <&gcc GCC_PCIE_1_PHY_BCR>,
>> + <&gcc GCC_PCIE_2_PHY_BCR>;
>> + reset-names = "phy", "common", "cfg",
>> + "lane0", "lane1", "lane2";
>> + };
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 5547984..d5e2b50f 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -446,6 +446,14 @@ config PHY_STIH41X_USB
>> Enable this to support the USB transceiver that is part of
>> STMicroelectronics STiH41x SoC series.
>>
>> +config PHY_QCOM_QMP
>> + tristate "Qualcomm QMP PHY Driver"
>> + depends on OF && (ARCH_QCOM || COMPILE_TEST)
>> + select GENERIC_PHY
>> + help
>> + Enable this to support the QMP PHY transceiver that is used
>> + with controllers such as PCIe, UFS, and USB on Qualcomm chips.
>> +
>> config PHY_QCOM_QUSB2
>> tristate "Qualcomm QUSB2 PHY Driver"
>> depends on OF && (ARCH_QCOM || COMPILE_TEST)
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 848489d..fde9fba 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -51,6 +51,7 @@ obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) +=
>> phy-spear1340-miphy.o
>> obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
>> obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o
>> obj-$(CONFIG_PHY_STIH41X_USB) += phy-stih41x-usb.o
>> +obj-$(CONFIG_PHY_QCOM_QMP) += phy-qcom-qmp.o
>> obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o
>> obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs.o
>> obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-20nm.o
>> diff --git a/drivers/phy/phy-qcom-qmp.c b/drivers/phy/phy-qcom-qmp.c
>> new file mode 100644
>> index 0000000..7e89179
>> --- /dev/null
>> +++ b/drivers/phy/phy-qcom-qmp.c
>> @@ -0,0 +1,1154 @@
>> +/*
>> + * Copyright (c) 2016, The Linux Foundation. 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/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/reset.h>
>> +#include <linux/slab.h>
>> +
>> +#include <dt-bindings/phy/phy.h>
>
> We would not need this once you have proper flags in cfg.
We can probably use the PHY_TYPE_{*} macros for pipe_clk.
Please see my comments in the related section below.
>
>
>> +
>> +
>> +static inline void qphy_setbits(u32 bitmask, void __iomem *reg)
>> +{
>> + u32 val;
>> +
>> + val = readl_relaxed(reg);
>> + val |= bitmask;
>> + writel_relaxed(val, reg);
>> +}
>> +
>> +static inline void qphy_clrbits(u32 bitmask, void __iomem *reg)
>> +{
>> + u32 val;
>> +
>> + val = readl_relaxed(reg);
>> + val &= ~bitmask;
>> + writel_relaxed(val, reg);
>> +}
>> +
>> +unsigned int msm8996_pciephy_tx_offsets[] = { 0x1000, 0x2000, 0x3000 };
>> +unsigned int msm8996_pciephy_rx_offsets[] = { 0x1200, 0x2200, 0x3200 };
>> +unsigned int msm8996_pciephy_pcs_offsets[] = { 0x1400, 0x2400, 0x3400 };
>> +
>> +unsigned int msm8996_usb3phy_tx_offsets[] = { 0x200 };
>> +unsigned int msm8996_usb3phy_rx_offsets[] = { 0x400 };
>> +unsigned int msm8996_usb3phy_pcs_offsets[] = { 0x600 };
>> +
>> +const struct qmp_phy_init_cfg pciephy_init_cfg = {
>> + .type = PHY_TYPE_PCIE,
>> + .nlanes = 3,
>> + .tx_offsets = msm8996_pciephy_tx_offsets,
>> + .rx_offsets = msm8996_pciephy_rx_offsets,
>> + .pcs_offsets = msm8996_pciephy_pcs_offsets,
>> +
>> + .phy_init_serdes_tbl = pciephy_serdes_init_tbl,
>> + .phy_init_serdes_tbl_sz = ARRAY_SIZE(pciephy_serdes_init_tbl),
>> + .phy_init_tx_tbl = pciephy_tx_init_tbl,
>> + .phy_init_tx_tbl_sz = ARRAY_SIZE(pciephy_tx_init_tbl),
>> + .phy_init_rx_tbl = pciephy_rx_init_tbl,
>> + .phy_init_rx_tbl_sz = ARRAY_SIZE(pciephy_rx_init_tbl),
>> + .phy_init_pcs_tbl = pciephy_pcs_init_tbl,
>> + .phy_init_pcs_tbl_sz = ARRAY_SIZE(pciephy_pcs_init_tbl),
>> + .has_phy_com_ctrl = true,
>> + .regs = pciephy_regs_layout,
>> + .mask_start_ctrl = (PHY_PCS_START | PHY_PLL_READY_GATE_EN),
>> + .mask_pwr_dn_ctrl = (PHY_SW_PWRDN | PHY_REFCLK_DRV_DSBL),
>> +};
>> +
>> +const struct qmp_phy_init_cfg usb3phy_init_cfg = {
>> + .type = PHY_TYPE_USB3,
>> + .nlanes = 1,
>> + .tx_offsets = msm8996_usb3phy_tx_offsets,
>> + .rx_offsets = msm8996_usb3phy_rx_offsets,
>> + .pcs_offsets = msm8996_usb3phy_pcs_offsets,
>> +
>> + .phy_init_serdes_tbl = usb3phy_serdes_init_tbl,
>> + .phy_init_serdes_tbl_sz = ARRAY_SIZE(usb3phy_serdes_init_tbl),
>> + .phy_init_tx_tbl = usb3phy_tx_init_tbl,
>> + .phy_init_tx_tbl_sz = ARRAY_SIZE(usb3phy_tx_init_tbl),
>> + .phy_init_rx_tbl = usb3phy_rx_init_tbl,
>> + .phy_init_rx_tbl_sz = ARRAY_SIZE(usb3phy_rx_init_tbl),
>> + .phy_init_pcs_tbl = usb3phy_pcs_init_tbl,
>> + .phy_init_pcs_tbl_sz = ARRAY_SIZE(usb3phy_pcs_init_tbl),
>> + .regs = usb3phy_regs_layout,
>> + .mask_start_ctrl = (PHY_SERDES_START | PHY_PCS_START),
>> + .mask_pwr_dn_ctrl = PHY_SW_PWRDN,
>> +};
>> +
>> +static void qcom_qmp_phy_configure(void __iomem *base,
>> + unsigned int *regs_layout,
>> + struct qmp_phy_init_tbl init_tbl[],
>> + int init_tbl_sz)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < init_tbl_sz; i++) {
>> + if (init_tbl[i].in_layout)
>> + writel_relaxed(init_tbl[i].cfg_val,
>> + base +
>> regs_layout[init_tbl[i].reg_offset]);
>> + else
>> + writel_relaxed(init_tbl[i].cfg_val,
>> + base + init_tbl[i].reg_offset);
>> + }
>> +
>> + /* flush buffered writes */
>> + mb();
>> +}
>> +
>> +static int qcom_qmp_phy_poweron(struct phy *phy)
>> +{
>> + struct qmp_phy_desc *phydesc = phy_get_drvdata(phy);
>> + struct qcom_qmp_phy *qphy = phydesc->qphy;
>> + int ret;
>> +
>> + dev_info(&phy->dev, "Powering on QMP phy\n");
>> +
>> + ret = regulator_enable(qphy->vdda_phy);
>> + if (ret) {
>> + dev_err(qphy->dev, "%s: vdda-phy enable failed, err=%d\n",
>> + __func__, ret);
>> + return ret;
>> + }
>> +
>> + ret = regulator_enable(qphy->vdda_pll);
>> + if (ret) {
>> + dev_err(qphy->dev, "%s: vdda-pll enable failed, err=%d\n",
>> + __func__, ret);
>> + goto err_vdda_pll;
>> + }
>> +
>> + if (qphy->vddp_ref_clk) {
>> + ret = regulator_enable(qphy->vddp_ref_clk);
>> + if (ret) {
>> + dev_err(qphy->dev, "%s: vdda-ref-clk enable
>> failed, err=%d\n",
>> + __func__, ret);
>> + goto err_vddp_refclk;
>> + }
>> + }
>> +
>> + if (!qphy->clk_enabled) {
>> + clk_prepare_enable(qphy->ref_clk_src);
>> + clk_prepare_enable(qphy->ref_clk);
>> + clk_prepare_enable(phydesc->pipe_clk);
>> + qphy->clk_enabled = true;
>> + }
>> +
>> + return 0;
>> +
>> +err_vddp_refclk:
>> + regulator_disable(qphy->vdda_pll);
>> +err_vdda_pll:
>> + regulator_disable(qphy->vdda_phy);
>> + return ret;
>> +}
>> +
>> +static int qcom_qmp_phy_poweroff(struct phy *phy)
>> +{
>> + struct qmp_phy_desc *phydesc = phy_get_drvdata(phy);
>> + struct qcom_qmp_phy *qphy = phydesc->qphy;
>> +
>> + if (qphy->clk_enabled) {
>> + clk_disable_unprepare(qphy->ref_clk_src);
>> + clk_disable_unprepare(qphy->ref_clk);
>> + clk_disable_unprepare(phydesc->pipe_clk);
>> + qphy->clk_enabled = false;
>> + }
>> +
>> + if (qphy->vddp_ref_clk)
>> + regulator_disable(qphy->vddp_ref_clk);
>> +
>> + regulator_disable(qphy->vdda_pll);
>> + regulator_disable(qphy->vdda_phy);
>> +
>> + return 0;
>> +}
>> +
>> +static int qcom_qmp_phy_is_ready(struct qcom_qmp_phy *qphy,
>> + void __iomem *pcs_status, u32 mask)
>> +{
>> + unsigned int init_timeout;
>> +
>> + init_timeout = PHY_READY_TIMEOUT_COUNT;
>> + do {
>> + if (readl_relaxed(pcs_status) & mask)
>> + break;
>> +
>> + usleep_range(REFCLK_STABILIZATION_DELAY_US_MIN,
>> + REFCLK_STABILIZATION_DELAY_US_MAX);
>> + } while (--init_timeout);
>> +
>> + if (!init_timeout)
>> + return -EBUSY;
>> +
>> + return 0;
>> +}
>> +
>> +static int qcom_qmp_phy_com_init(struct qcom_qmp_phy *qphy)
>> +{
>> + const struct qmp_phy_init_cfg *cfg = qphy->cfg;
>> + void __iomem *serdes = qphy->serdes;
>> + int ret;
>> +
>> + mutex_lock(&qphy->phy_mutex);
>> + if (qphy->init_count++) {
>> + mutex_unlock(&qphy->phy_mutex);
>> + return 0;
>> + }
>> +
>> + ret = reset_control_deassert(qphy->phy_rst);
>> + if (ret) {
>> + dev_err(qphy->dev, "phy reset deassert failed\n");
>
> mutex unlock
Yes, will add one.
>
>> + return ret;
>> + }
>> +
>> + ret = reset_control_deassert(qphy->phycom_rst);
>> + if (ret) {
>> + dev_err(qphy->dev, "common reset deassert failed\n");
>> + goto err_phycom_rst;
>> + }
>> +
>> + if (qphy->phycfg_rst) {
>> + ret = reset_control_deassert(qphy->phycfg_rst);
>> + if (ret) {
>> + dev_err(qphy->dev, "common reset deassert
>> failed\n");
>> + goto err_phycfg_rst;
>> + }
>> + }
>> +
>> + if (cfg->has_phy_com_ctrl) {
>> + qphy_setbits(PHY_SW_PWRDN,
>> + serdes + cfg->regs[QPHY_COM_POWER_DOWN_CONTROL]);
>> + /* Make sure that above write is completed */
>> + mb();
>> + }
>> +
>> + /* Serdes configuration */
>> + qcom_qmp_phy_configure(serdes, cfg->regs,
>> cfg->phy_init_serdes_tbl,
>> + cfg->phy_init_serdes_tbl_sz);
>> +
>> + if (cfg->has_phy_com_ctrl) {
>> + qphy_clrbits(PHY_SW_RESET, serdes +
>> + cfg->regs[QPHY_COM_SW_RESET]);
>> + qphy_setbits(PHY_SERDES_START | PHY_PCS_START,
>> + serdes +
>> cfg->regs[QPHY_COM_START_CONTROL]);
>> + /* Make sure that above write is completed */
>> + mb();
>> +
>> + ret = qcom_qmp_phy_is_ready(qphy, serdes +
>> +
>> cfg->regs[QPHY_COM_PCS_READY_STATUS],
>> + MASK_COM_PCS_READY);
>> + if (ret) {
>> + dev_err(qphy->dev,
>> + "common control block init timed-out\n");
>> + goto err_phy_comctrl;
>> + }
>> + }
>> +
>> + mutex_unlock(&qphy->phy_mutex);
>> +
>> + return 0;
>> +
>> +err_phy_comctrl:
>
> mutex unlock
Right, here as well.
>
>> + if (qphy->phycfg_rst)
>> + reset_control_assert(qphy->phycfg_rst);
>> +err_phycfg_rst:
>> + reset_control_assert(qphy->phycom_rst);
>> +err_phycom_rst:
>> + reset_control_assert(qphy->phy_rst);
>> + return ret;
>> +}
>> +
>> +static int qcom_qmp_phy_com_exit(struct qcom_qmp_phy *qphy)
>> +{
>> + const struct qmp_phy_init_cfg *cfg = qphy->cfg;
>> + void __iomem *serdes = qphy->serdes;
>> +
>> + mutex_lock(&qphy->phy_mutex);
>> + if (--qphy->init_count) {
>> + mutex_unlock(&qphy->phy_mutex);
>> + return 0;
>> + }
>> +
>> + if (cfg->has_phy_com_ctrl) {
>> + qphy_setbits(PHY_SERDES_START | PHY_PCS_START,
>> + serdes +
>> cfg->regs[QPHY_COM_START_CONTROL]);
>> + qphy_clrbits(PHY_SW_RESET, serdes +
>> + cfg->regs[QPHY_COM_SW_RESET]);
>> + qphy_setbits(PHY_SW_PWRDN,
>> + serdes + cfg->regs[QPHY_COM_POWER_DOWN_CONTROL]);
>> +
>> + /* Make sure that above writes are completed */
>> + mb();
>> + }
>> +
>> + reset_control_assert(qphy->phy_rst);
>> + reset_control_assert(qphy->phycom_rst);
>> + if (qphy->phycfg_rst)
>> + reset_control_assert(qphy->phycfg_rst);
>> +
>> + mutex_unlock(&qphy->phy_mutex);
>> +
>> + return 0;
>> +}
>> +
>> +/* PHY Initialization */
>> +static int qcom_qmp_phy_init(struct phy *phy)
>> +{
>> + struct qmp_phy_desc *phydesc = phy_get_drvdata(phy);
>> + struct qcom_qmp_phy *qphy = phydesc->qphy;
>> + const struct qmp_phy_init_cfg *cfg = qphy->cfg;
>> + void __iomem *tx = phydesc->tx;
>> + void __iomem *rx = phydesc->rx;
>> + void __iomem *pcs = phydesc->pcs;
>> + int ret;
>> +
>> + dev_info(qphy->dev, "Initializing QMP phy\n");
>> +
>> + /* enable interface clocks to program phy */
>> + clk_prepare_enable(qphy->aux_clk);
>> + clk_prepare_enable(qphy->cfg_ahb_clk);
>> +
>> + ret = qcom_qmp_phy_com_init(qphy);
>> + if (ret)
>> + goto err;
>> +
>> + if (phydesc->lane_rst) {
>> + ret = reset_control_deassert(phydesc->lane_rst);
>> + if (ret) {
>> + dev_err(qphy->dev, "lane<%d> reset deassert
>> failed\n",
>> + phydesc->index);
>> + goto err_lane_rst;
>> + }
>> + }
>> +
>> + /* Tx, Rx, and PCS configurations */
>> + qcom_qmp_phy_configure(tx, cfg->regs, cfg->phy_init_tx_tbl,
>> + cfg->phy_init_tx_tbl_sz);
>> + qcom_qmp_phy_configure(rx, cfg->regs, cfg->phy_init_rx_tbl,
>> + cfg->phy_init_rx_tbl_sz);
>> + qcom_qmp_phy_configure(pcs, cfg->regs, cfg->phy_init_pcs_tbl,
>> + cfg->phy_init_pcs_tbl_sz);
>> +
>> + /*
>> + * Pull out PHY from POWER DOWN state:
>> + * This is active low enable signal to power-down PHY.
>> + */
>> + qphy_setbits(cfg->mask_pwr_dn_ctrl,
>> + pcs + QPHY_POWER_DOWN_CONTROL);
>> + /* XXX: 10 us delay; given in PCIE HPG only */
>> + usleep_range(POWER_DOWN_DELAY_US_MIN, POWER_DOWN_DELAY_US_MAX);
>> +
>> + /* start SerDes and Phy-Coding-Sublayer */
>> + qphy_setbits(cfg->mask_start_ctrl, pcs + QPHY_START_CTRL);
>> +
>> + /* Pull PHY out of reset state */
>> + qphy_clrbits(PHY_SW_RESET, pcs + QPHY_SW_RESET);
>> + /* Make sure that above writes are completed */
>> + mb();
>> +
>> + ret = qcom_qmp_phy_is_ready(qphy, pcs +
>> + cfg->regs[QPHY_PCS_READY_STATUS],
>> + MASK_PHYSTATUS);
>> + if (ret) {
>> + dev_err(qphy->dev, "phy initialization timed-out\n");
>> + goto err_pcs_ready;
>> + }
>> +
>> + return 0;
>> +
>> +err_pcs_ready:
>> + if (phydesc->lane_rst)
>> + reset_control_assert(phydesc->lane_rst);
>> +err_lane_rst:
>> + qcom_qmp_phy_com_exit(qphy);
>> +err:
>> + clk_disable_unprepare(qphy->cfg_ahb_clk);
>> + clk_disable_unprepare(qphy->aux_clk);
>> + return ret;
>> +}
>> +
>> +static int qcom_qmp_phy_exit(struct phy *phy)
>> +{
>> + struct qmp_phy_desc *phydesc = phy_get_drvdata(phy);
>> + struct qcom_qmp_phy *qphy = phydesc->qphy;
>> + const struct qmp_phy_init_cfg *cfg = qphy->cfg;
>> +
>> + /* PHY reset */
>> + qphy_setbits(PHY_SW_RESET, phydesc->pcs + QPHY_SW_RESET);
>> +
>> + /* stop SerDes and Phy-Coding-Sublayer */
>> + qphy_clrbits(cfg->mask_start_ctrl, phydesc->pcs +
>> QPHY_START_CTRL);
>> +
>> + /* Put PHY into POWER DOWN state: active low */
>> + qphy_clrbits(cfg->mask_pwr_dn_ctrl,
>> + phydesc->pcs + QPHY_POWER_DOWN_CONTROL);
>> +
>> + /* Make sure that above writes are completed */
>> + mb();
>> +
>> + if (phydesc->lane_rst)
>> + reset_control_assert(phydesc->lane_rst);
>> +
>> + qcom_qmp_phy_com_exit(qphy);
>> +
>> + clk_disable_unprepare(qphy->aux_clk);
>> + clk_disable_unprepare(qphy->cfg_ahb_clk);
>> +
>> + return 0;
>> +}
>> +
>> +
>> +static int qcom_qmp_phy_regulator_init(struct device *dev)
>> +{
>> + struct qcom_qmp_phy *qphy = dev_get_drvdata(dev);
>> + int ret = 0;
>> +
>> + qphy->vdda_phy = devm_regulator_get(dev, "vdda-phy");
>> + if (IS_ERR(qphy->vdda_phy)) {
>> + ret = PTR_ERR(qphy->vdda_phy);
>> + dev_err(dev, "failed to get vdda-phy, %d\n", ret);
>> + return ret;
>> + }
>> +
>> + qphy->vdda_pll = devm_regulator_get(dev, "vdda-pll");
>> + if (IS_ERR(qphy->vdda_pll)) {
>> + ret = PTR_ERR(qphy->vdda_pll);
>> + dev_err(dev, "failed to get vdda-pll, %d\n", ret);
>> + return ret;
>> + }
>> +
>> + /* optional regulator */
>> + qphy->vddp_ref_clk = devm_regulator_get(dev, "vddp-ref-clk");
>
>
> Should mention this in bindings too.
Right, missed this one. Will add.
>
>
>> + if (IS_ERR(qphy->vddp_ref_clk)) {
>> + ret = PTR_ERR(qphy->vddp_ref_clk);
>> + dev_info(dev, "failed to get vddp-ref-clk, %d\n", ret);
>> + qphy->vddp_ref_clk = NULL;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int qcom_qmp_phy_clk_init(struct device *dev)
>> +{
>> + struct qcom_qmp_phy *qphy = dev_get_drvdata(dev);
>> + int ret;
>> +
>> + qphy->aux_clk = devm_clk_get(dev, "aux");
>> + if (IS_ERR(qphy->aux_clk)) {
>> + ret = PTR_ERR(qphy->aux_clk);
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev, "failed to get aux_clk\n");
>> + return ret;
>> + }
>> +
>> + qphy->cfg_ahb_clk = devm_clk_get(dev, "cfg_ahb");
>> + if (IS_ERR(qphy->cfg_ahb_clk)) {
>> + ret = PTR_ERR(qphy->cfg_ahb_clk);
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev, "failed to get cfg_ahb_clk\n");
>> + return ret;
>> + }
>> +
>> + /*
>> + * ref_clk and ref_clk_src handles may not be available in
>> + * all hardwares. So we don't return error in these cases.
>> + */
>
>
> This thing has to be mentioned in the bindings too.
All current chips have and future chips will have these clocks available
with them. So, I think we can make these clocks mandatory (not Optional).
>
>
>> + qphy->ref_clk_src = devm_clk_get(dev, "ref_clk_src");
>> + if (IS_ERR(qphy->ref_clk_src)) {
>> + ret = PTR_ERR(qphy->ref_clk_src);
>> + if (ret != -EPROBE_DEFER) {
>> + qphy->ref_clk_src = NULL;
>> + dev_dbg(dev, "failed to get ref_clk_src\n");
>> + } else {
>> + return ret;
>> + }
>> + }
>> +
>> + qphy->ref_clk = devm_clk_get(dev, "ref_clk");
>> + if (IS_ERR(qphy->ref_clk)) {
>> + ret = PTR_ERR(qphy->ref_clk);
>> + if (ret != -EPROBE_DEFER) {
>> + qphy->ref_clk = NULL;
>> + dev_dbg(dev, "failed to get ref_clk\n");
>> + } else {
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static struct phy *qcom_qmp_phy_xlate(struct device *dev,
>> + struct of_phandle_args *args)
>> +{
>> + struct qcom_qmp_phy *qphy = dev_get_drvdata(dev);
>> + int i;
>> +
>> + if (WARN_ON(args->args[0] >= qphy->cfg->nlanes))
>> + return ERR_PTR(-ENODEV);
>> +
>> + for (i = 0; i < qphy->cfg->nlanes; i++) {
>> + if (qphy->phys[i]->index == args->args[0])
>> + break;
>> + }
>> +
>> + if (i == qphy->cfg->nlanes)
>> + return ERR_PTR(-ENODEV);
>> +
>> + return qphy->phys[i]->phy;
>> +}
>> +
>> +static const struct phy_ops qcom_qmp_phy_gen_ops = {
>> + .init = qcom_qmp_phy_init,
>> + .exit = qcom_qmp_phy_exit,
>> + .power_on = qcom_qmp_phy_poweron,
>> + .power_off = qcom_qmp_phy_poweroff,
>> + .owner = THIS_MODULE,
>> +};
>> +
>> +static const struct of_device_id qcom_qmp_phy_of_match_table[] = {
>> + {
>> + .compatible = "qcom,msm8996-qmp-pcie-phy",
>> + .data = &pciephy_init_cfg,
>> + }, {
>> + .compatible = "qcom,msm8996-qmp-usb3-phy",
>> + .data = &usb3phy_init_cfg,
>> + },
>> + { },
>> +};
>> +MODULE_DEVICE_TABLE(of, qcom_qmp_phy_of_match_table);
>> +
>> +static int qcom_qmp_phy_probe(struct platform_device *pdev)
>> +{
>> + struct qcom_qmp_phy *qphy;
>> + struct device *dev = &pdev->dev;
>> + struct device_node *child;
>> + struct phy_provider *phy_provider;
>> + struct resource *res;
>> + const struct of_device_id *match;
>> + void __iomem *base;
>> + int ret = 0;
>> + int id;
>> +
>> + qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
>> + if (!qphy)
>> + return -ENOMEM;
>
> new line
Ok.
>>
>> + qphy->dev = dev;
>> + dev_set_drvdata(dev, qphy);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res)
>> + return -ENODEV;
>
> new line
Sure,
>
>> + base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(base))
>> + return PTR_ERR(base);
>> +
>> + /* per PHY serdes; usually located at base address */
>> + qphy->serdes = base;
>> +
>> + mutex_init(&qphy->phy_mutex);
>> +
>> + /* Get the specific init parameters of QMP phy */
>> + match = of_match_node(qcom_qmp_phy_of_match_table, dev->of_node);
>> + qphy->cfg = match->data;
>> +
>> + ret = qcom_qmp_phy_clk_init(dev);
>> + if (ret) {
>> + dev_err(dev, "clock init failed\n");
>> + return ret;
>> + }
>> +
>> + ret = qcom_qmp_phy_regulator_init(dev);
>> + if (ret) {
>> + dev_err(dev, "regulator init failed\n");
>> + return ret;
>> + }
>> +
>> + qphy->phy_rst = devm_reset_control_get(dev, "phy");
>> + if (IS_ERR(qphy->phy_rst)) {
>> + dev_err(dev, "failed to get phy core reset\n");
>> + return PTR_ERR(qphy->phy_rst);
>> + }
>> +
>> + qphy->phycom_rst = devm_reset_control_get(dev, "common");
>> + if (IS_ERR(qphy->phycom_rst)) {
>> + dev_err(dev, "failed to get phy common reset\n");
>> + return PTR_ERR(qphy->phycom_rst);
>> + }
>> +
>> + qphy->phycfg_rst = devm_reset_control_get(dev, "cfg");
>> + if (IS_ERR(qphy->phycfg_rst)) {
>> + dev_err(dev, "failed to get phy ahb cfg reset\n");
>> + qphy->phycfg_rst = NULL;
>> + }
>> +
>> + qphy->phys = devm_kcalloc(dev, qphy->cfg->nlanes,
>> + sizeof(*qphy->phys), GFP_KERNEL);
>> + if (!qphy->phys)
>> + return -ENOMEM;
>> +
>> + for (id = 0; id < qphy->cfg->nlanes; id++) {
>> + struct phy *generic_phy;
>> + struct qmp_phy_desc *phy_desc;
>> + char prop_name[MAX_PROP_NAME];
>> +
>> + phy_desc = devm_kzalloc(dev, sizeof(*phy_desc),
>> GFP_KERNEL);
>> + if (!phy_desc) {
>> + ret = -ENOMEM;
>> + goto put_child;
>> + }
>> +
>> + phy_desc->tx = base + qphy->cfg->tx_offsets[id];
>> + phy_desc->rx = base + qphy->cfg->rx_offsets[id];
>> + phy_desc->pcs = base + qphy->cfg->pcs_offsets[id];
>> +
>> + /*
>> + * Get PHY's Pipe clock, if any; USB3 and PCIe are PIPE
>> + * based phys, so they essentially have pipe clock
>> + */
>> + memset(&prop_name, 0, sizeof(prop_name));
>> + snprintf(prop_name, MAX_PROP_NAME, "pipe%d", id);
>> + phy_desc->pipe_clk = devm_clk_get(dev, prop_name);
>> + if (IS_ERR(phy_desc->pipe_clk)) {
>> + if (qphy->cfg->type == PHY_TYPE_PCIE ||
>> + qphy->cfg->type == PHY_TYPE_USB3) {
>> + ret = PTR_ERR(phy_desc->pipe_clk);
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev,
>> + "failed to get lane%d pipe_clk\n",
>> id);
>> + return ret;
>> + } else {
>> + phy_desc->pipe_clk = NULL;
>> + }
>> + }
>
>
> Do we need to really need phy type for this?
> You should proably make a flag in cfg to mark this rather then using phy
> type. Hopefully it will also simplify the logic.
The pipe clock is something that's specific to PCIe and USB3 type
phys (both are PIPE3 specs based phys). So i think it is okay
to use the PHY_TYPE_{*} macros here. Looks a bit cleaner rather
than having a cfg flag. No ?
Using PHY_TYPE_{*} macros will also keep the doors open to
other PHY types that are added at a later point in time.
>
>
>> +
>> + /* Get lane reset, if any */
>> + memset(&prop_name, 0, sizeof(prop_name));
>> + snprintf(prop_name, MAX_PROP_NAME, "lane%d", id);
>> + phy_desc->lane_rst = devm_reset_control_get(dev,
>> prop_name);
>> + if (IS_ERR(phy_desc->lane_rst)) {
>> + if (qphy->cfg->type == PHY_TYPE_PCIE) {
>> + dev_err(dev, "failed to get lane%d
>> reset\n",
>> +
>> id);
>> + ret = PTR_ERR(phy_desc->lane_rst);
>> + goto put_child;
>> + } else {
>> + phy_desc->lane_rst = NULL;
>> + }
>> + }
>
>
> Same comment as above.
Correct, here we can add the cfg flag as you suggested.
>
>
>
>> +
>> + generic_phy = devm_phy_create(dev, NULL,
>> &qcom_qmp_phy_gen_ops);
>> + if (IS_ERR(generic_phy)) {
>> + ret = PTR_ERR(generic_phy);
>> + dev_err(dev, "failed to create qphy %d\n", ret);
>> + goto put_child;
>> + }
>> +
>> + phy_desc->phy = generic_phy;
>> + phy_desc->index = id;
>> + phy_desc->qphy = qphy;
>> + phy_set_drvdata(generic_phy, phy_desc);
>> + qphy->phys[id] = phy_desc;
>> + }
>> +
>> + phy_provider = devm_of_phy_provider_register(dev,
>> qcom_qmp_phy_xlate);
>> + if (IS_ERR(phy_provider)) {
>> + ret = PTR_ERR(phy_provider);
>> + dev_err(dev, "failed to register qphy %d\n", ret);
>> + goto put_child;
>> + }
>> +
>> +put_child:
>> + of_node_put(child);
>> + return ret;
>> +}
>> +
>> +static struct platform_driver qcom_qmp_phy_driver = {
>> + .probe = qcom_qmp_phy_probe,
>> + .driver = {
>> + .name = "qcom_qmp_phy",
>> + .of_match_table =
>> of_match_ptr(qcom_qmp_phy_of_match_table),
>> + },
>> +};
>> +
>> +module_platform_driver(qcom_qmp_phy_driver);
>> +
>> +MODULE_AUTHOR("Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>");
>> +MODULE_DESCRIPTION("Qualcomm QMP PHY driver");
>> +MODULE_LICENSE("GPL v2");
>>
>
Thanks
Vivek
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