Re: [PATCH 2/2] phy: qcom-qmp: new qmp phy driver for qcom-chipsets
From: Srinivas Kandagatla
Date: Wed Oct 26 2016 - 09:57:19 EST
Hi Vivek,
Thanks for consolidating qmp phy support for both usb and pcie.
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>
---
.../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.
+ 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.
+
+
+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
+ 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
+ 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.
+ 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.
+ 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
+ qphy->dev = dev;
+ dev_set_drvdata(dev, qphy);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
new line
+ 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.
+
+ /* 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.
+
+ 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");