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path: root/drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c
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Diffstat (limited to 'drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c')
-rw-r--r--drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c876
1 files changed, 876 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c
new file mode 100644
index 0000000000..ab61a9c73b
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c
@@ -0,0 +1,876 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.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 "phy-qcom-qmp.h"
+
+/* QPHY_SW_RESET bit */
+#define SW_RESET BIT(0)
+/* QPHY_POWER_DOWN_CONTROL */
+#define SW_PWRDN BIT(0)
+#define REFCLK_DRV_DSBL BIT(1)
+/* QPHY_START_CONTROL bits */
+#define SERDES_START BIT(0)
+#define PCS_START BIT(1)
+#define PLL_READY_GATE_EN BIT(3)
+/* QPHY_PCS_STATUS bit */
+#define PHYSTATUS BIT(6)
+/* QPHY_COM_PCS_READY_STATUS bit */
+#define PCS_READY BIT(0)
+
+#define PHY_INIT_COMPLETE_TIMEOUT 10000
+#define POWER_DOWN_DELAY_US_MIN 10
+#define POWER_DOWN_DELAY_US_MAX 20
+
+struct qmp_phy_init_tbl {
+ unsigned int offset;
+ unsigned int val;
+ /*
+ * mask of lanes for which this register is written
+ * for cases when second lane needs different values
+ */
+ u8 lane_mask;
+};
+
+#define QMP_PHY_INIT_CFG(o, v) \
+ { \
+ .offset = o, \
+ .val = v, \
+ .lane_mask = 0xff, \
+ }
+
+#define QMP_PHY_INIT_CFG_LANE(o, v, l) \
+ { \
+ .offset = o, \
+ .val = v, \
+ .lane_mask = l, \
+ }
+
+/* set of registers with offsets different per-PHY */
+enum qphy_reg_layout {
+ /* Common block control registers */
+ QPHY_COM_SW_RESET,
+ QPHY_COM_POWER_DOWN_CONTROL,
+ QPHY_COM_START_CONTROL,
+ QPHY_COM_PCS_READY_STATUS,
+ /* PCS registers */
+ QPHY_SW_RESET,
+ QPHY_START_CTRL,
+ QPHY_PCS_STATUS,
+ /* Keep last to ensure regs_layout arrays are properly initialized */
+ QPHY_LAYOUT_SIZE
+};
+
+static const unsigned int pciephy_regs_layout[QPHY_LAYOUT_SIZE] = {
+ [QPHY_COM_SW_RESET] = 0x400,
+ [QPHY_COM_POWER_DOWN_CONTROL] = 0x404,
+ [QPHY_COM_START_CONTROL] = 0x408,
+ [QPHY_COM_PCS_READY_STATUS] = 0x448,
+ [QPHY_SW_RESET] = QPHY_V2_PCS_SW_RESET,
+ [QPHY_START_CTRL] = QPHY_V2_PCS_START_CONTROL,
+ [QPHY_PCS_STATUS] = QPHY_V2_PCS_PCI_PCS_STATUS,
+};
+
+static const struct qmp_phy_init_tbl msm8996_pcie_serdes_tbl[] = {
+ QMP_PHY_INIT_CFG(QSERDES_COM_BIAS_EN_CLKBUFLR_EN, 0x1c),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CLK_ENABLE1, 0x10),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CLK_SELECT, 0x33),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CMN_CONFIG, 0x06),
+ QMP_PHY_INIT_CFG(QSERDES_COM_LOCK_CMP_EN, 0x42),
+ QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_MAP, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER1, 0xff),
+ QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER2, 0x1f),
+ QMP_PHY_INIT_CFG(QSERDES_COM_HSCLK_SEL, 0x01),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SVS_MODE_CLK_SEL, 0x01),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CORE_CLK_EN, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CORECLK_DIV, 0x0a),
+ QMP_PHY_INIT_CFG(QSERDES_COM_BG_TIMER, 0x09),
+ QMP_PHY_INIT_CFG(QSERDES_COM_DEC_START_MODE0, 0x82),
+ QMP_PHY_INIT_CFG(QSERDES_COM_DIV_FRAC_START3_MODE0, 0x03),
+ QMP_PHY_INIT_CFG(QSERDES_COM_DIV_FRAC_START2_MODE0, 0x55),
+ QMP_PHY_INIT_CFG(QSERDES_COM_DIV_FRAC_START1_MODE0, 0x55),
+ QMP_PHY_INIT_CFG(QSERDES_COM_LOCK_CMP3_MODE0, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_LOCK_CMP2_MODE0, 0x1a),
+ QMP_PHY_INIT_CFG(QSERDES_COM_LOCK_CMP1_MODE0, 0x0a),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CLK_SELECT, 0x33),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SYS_CLK_CTRL, 0x02),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SYSCLK_BUF_ENABLE, 0x1f),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SYSCLK_EN_SEL, 0x04),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CP_CTRL_MODE0, 0x0b),
+ QMP_PHY_INIT_CFG(QSERDES_COM_PLL_RCTRL_MODE0, 0x16),
+ QMP_PHY_INIT_CFG(QSERDES_COM_PLL_CCTRL_MODE0, 0x28),
+ QMP_PHY_INIT_CFG(QSERDES_COM_INTEGLOOP_GAIN1_MODE0, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_INTEGLOOP_GAIN0_MODE0, 0x80),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_EN_CENTER, 0x01),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_PER1, 0x31),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_PER2, 0x01),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_ADJ_PER1, 0x02),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_ADJ_PER2, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_STEP_SIZE1, 0x2f),
+ QMP_PHY_INIT_CFG(QSERDES_COM_SSC_STEP_SIZE2, 0x19),
+ QMP_PHY_INIT_CFG(QSERDES_COM_RESCODE_DIV_NUM, 0x15),
+ QMP_PHY_INIT_CFG(QSERDES_COM_BG_TRIM, 0x0f),
+ QMP_PHY_INIT_CFG(QSERDES_COM_PLL_IVCO, 0x0f),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CLK_EP_DIV, 0x19),
+ QMP_PHY_INIT_CFG(QSERDES_COM_CLK_ENABLE1, 0x10),
+ QMP_PHY_INIT_CFG(QSERDES_COM_HSCLK_SEL, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_COM_RESCODE_DIV_NUM, 0x40),
+};
+
+static const struct qmp_phy_init_tbl msm8996_pcie_tx_tbl[] = {
+ QMP_PHY_INIT_CFG(QSERDES_TX_HIGHZ_TRANSCEIVEREN_BIAS_DRVR_EN, 0x45),
+ QMP_PHY_INIT_CFG(QSERDES_TX_LANE_MODE, 0x06),
+};
+
+static const struct qmp_phy_init_tbl msm8996_pcie_rx_tbl[] = {
+ QMP_PHY_INIT_CFG(QSERDES_RX_SIGDET_ENABLES, 0x1c),
+ QMP_PHY_INIT_CFG(QSERDES_RX_RX_EQU_ADAPTOR_CNTRL2, 0x01),
+ QMP_PHY_INIT_CFG(QSERDES_RX_RX_EQU_ADAPTOR_CNTRL3, 0x00),
+ QMP_PHY_INIT_CFG(QSERDES_RX_RX_EQU_ADAPTOR_CNTRL4, 0xdb),
+ QMP_PHY_INIT_CFG(QSERDES_RX_RX_BAND, 0x18),
+ QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_GAIN, 0x04),
+ QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_GAIN_HALF, 0x04),
+ QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_SATURATION_AND_ENABLE, 0x4b),
+ QMP_PHY_INIT_CFG(QSERDES_RX_SIGDET_DEGLITCH_CNTRL, 0x14),
+ QMP_PHY_INIT_CFG(QSERDES_RX_SIGDET_LVL, 0x19),
+};
+
+static const struct qmp_phy_init_tbl msm8996_pcie_pcs_tbl[] = {
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_RX_IDLE_DTCT_CNTRL, 0x4c),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_PWRUP_RESET_DLY_TIME_AUXCLK, 0x00),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_LP_WAKEUP_DLY_TIME_AUXCLK, 0x01),
+
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_PLL_LOCK_CHK_DLY_TIME, 0x05),
+
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_ENDPOINT_REFCLK_DRIVE, 0x05),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_POWER_DOWN_CONTROL, 0x02),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_POWER_STATE_CONFIG4, 0x00),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_POWER_STATE_CONFIG1, 0xa3),
+ QMP_PHY_INIT_CFG(QPHY_V2_PCS_TXDEEMPH_M3P5DB_V0, 0x0e),
+};
+
+/* struct qmp_phy_cfg - per-PHY initialization config */
+struct qmp_phy_cfg {
+ /* number of PHYs provided by this block */
+ int num_phys;
+
+ /* Init sequence for PHY blocks - serdes, tx, rx, pcs */
+ const struct qmp_phy_init_tbl *serdes_tbl;
+ int serdes_tbl_num;
+ const struct qmp_phy_init_tbl *tx_tbl;
+ int tx_tbl_num;
+ const struct qmp_phy_init_tbl *rx_tbl;
+ int rx_tbl_num;
+ const struct qmp_phy_init_tbl *pcs_tbl;
+ int pcs_tbl_num;
+
+ /* clock ids to be requested */
+ const char * const *clk_list;
+ int num_clks;
+ /* resets to be requested */
+ const char * const *reset_list;
+ int num_resets;
+ /* regulators to be requested */
+ const char * const *vreg_list;
+ int num_vregs;
+
+ /* array of registers with different offsets */
+ const unsigned int *regs;
+};
+
+/**
+ * struct qmp_phy - per-lane phy descriptor
+ *
+ * @phy: generic phy
+ * @cfg: phy specific configuration
+ * @serdes: iomapped memory space for phy's serdes (i.e. PLL)
+ * @tx: iomapped memory space for lane's tx
+ * @rx: iomapped memory space for lane's rx
+ * @pcs: iomapped memory space for lane's pcs
+ * @pipe_clk: pipe clock
+ * @index: lane index
+ * @qmp: QMP phy to which this lane belongs
+ * @lane_rst: lane's reset controller
+ */
+struct qmp_phy {
+ struct phy *phy;
+ const struct qmp_phy_cfg *cfg;
+ void __iomem *serdes;
+ void __iomem *tx;
+ void __iomem *rx;
+ void __iomem *pcs;
+ struct clk *pipe_clk;
+ unsigned int index;
+ struct qcom_qmp *qmp;
+ struct reset_control *lane_rst;
+};
+
+/**
+ * struct qcom_qmp - structure holding QMP phy block attributes
+ *
+ * @dev: device
+ *
+ * @clks: array of clocks required by phy
+ * @resets: array of resets required by phy
+ * @vregs: regulator supplies bulk data
+ *
+ * @phys: array of per-lane phy descriptors
+ * @phy_mutex: mutex lock for PHY common block initialization
+ * @init_count: phy common block initialization count
+ */
+struct qcom_qmp {
+ struct device *dev;
+
+ struct clk_bulk_data *clks;
+ struct reset_control_bulk_data *resets;
+ struct regulator_bulk_data *vregs;
+
+ struct qmp_phy **phys;
+
+ struct mutex phy_mutex;
+ int init_count;
+};
+
+static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
+{
+ u32 reg;
+
+ reg = readl(base + offset);
+ reg |= val;
+ writel(reg, base + offset);
+
+ /* ensure that above write is through */
+ readl(base + offset);
+}
+
+static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
+{
+ u32 reg;
+
+ reg = readl(base + offset);
+ reg &= ~val;
+ writel(reg, base + offset);
+
+ /* ensure that above write is through */
+ readl(base + offset);
+}
+
+/* list of clocks required by phy */
+static const char * const msm8996_phy_clk_l[] = {
+ "aux", "cfg_ahb", "ref",
+};
+
+/* list of resets */
+static const char * const msm8996_pciephy_reset_l[] = {
+ "phy", "common", "cfg",
+};
+
+/* list of regulators */
+static const char * const qmp_phy_vreg_l[] = {
+ "vdda-phy", "vdda-pll",
+};
+
+static const struct qmp_phy_cfg msm8996_pciephy_cfg = {
+ .num_phys = 3,
+
+ .serdes_tbl = msm8996_pcie_serdes_tbl,
+ .serdes_tbl_num = ARRAY_SIZE(msm8996_pcie_serdes_tbl),
+ .tx_tbl = msm8996_pcie_tx_tbl,
+ .tx_tbl_num = ARRAY_SIZE(msm8996_pcie_tx_tbl),
+ .rx_tbl = msm8996_pcie_rx_tbl,
+ .rx_tbl_num = ARRAY_SIZE(msm8996_pcie_rx_tbl),
+ .pcs_tbl = msm8996_pcie_pcs_tbl,
+ .pcs_tbl_num = ARRAY_SIZE(msm8996_pcie_pcs_tbl),
+ .clk_list = msm8996_phy_clk_l,
+ .num_clks = ARRAY_SIZE(msm8996_phy_clk_l),
+ .reset_list = msm8996_pciephy_reset_l,
+ .num_resets = ARRAY_SIZE(msm8996_pciephy_reset_l),
+ .vreg_list = qmp_phy_vreg_l,
+ .num_vregs = ARRAY_SIZE(qmp_phy_vreg_l),
+ .regs = pciephy_regs_layout,
+};
+
+static void qmp_pcie_msm8996_configure_lane(void __iomem *base,
+ const struct qmp_phy_init_tbl tbl[],
+ int num,
+ u8 lane_mask)
+{
+ int i;
+ const struct qmp_phy_init_tbl *t = tbl;
+
+ if (!t)
+ return;
+
+ for (i = 0; i < num; i++, t++) {
+ if (!(t->lane_mask & lane_mask))
+ continue;
+
+ writel(t->val, base + t->offset);
+ }
+}
+
+static void qmp_pcie_msm8996_configure(void __iomem *base,
+ const struct qmp_phy_init_tbl tbl[],
+ int num)
+{
+ qmp_pcie_msm8996_configure_lane(base, tbl, num, 0xff);
+}
+
+static int qmp_pcie_msm8996_serdes_init(struct qmp_phy *qphy)
+{
+ struct qcom_qmp *qmp = qphy->qmp;
+ const struct qmp_phy_cfg *cfg = qphy->cfg;
+ void __iomem *serdes = qphy->serdes;
+ const struct qmp_phy_init_tbl *serdes_tbl = cfg->serdes_tbl;
+ int serdes_tbl_num = cfg->serdes_tbl_num;
+ void __iomem *status;
+ unsigned int val;
+ int ret;
+
+ qmp_pcie_msm8996_configure(serdes, serdes_tbl, serdes_tbl_num);
+
+ qphy_clrbits(serdes, cfg->regs[QPHY_COM_SW_RESET], SW_RESET);
+ qphy_setbits(serdes, cfg->regs[QPHY_COM_START_CONTROL],
+ SERDES_START | PCS_START);
+
+ status = serdes + cfg->regs[QPHY_COM_PCS_READY_STATUS];
+ ret = readl_poll_timeout(status, val, (val & PCS_READY), 200,
+ PHY_INIT_COMPLETE_TIMEOUT);
+ if (ret) {
+ dev_err(qmp->dev,
+ "phy common block init timed-out\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_com_init(struct qmp_phy *qphy)
+{
+ struct qcom_qmp *qmp = qphy->qmp;
+ const struct qmp_phy_cfg *cfg = qphy->cfg;
+ void __iomem *serdes = qphy->serdes;
+ int ret;
+
+ mutex_lock(&qmp->phy_mutex);
+ if (qmp->init_count++) {
+ mutex_unlock(&qmp->phy_mutex);
+ return 0;
+ }
+
+ ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
+ if (ret) {
+ dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
+ goto err_decrement_count;
+ }
+
+ ret = reset_control_bulk_assert(cfg->num_resets, qmp->resets);
+ if (ret) {
+ dev_err(qmp->dev, "reset assert failed\n");
+ goto err_disable_regulators;
+ }
+
+ ret = reset_control_bulk_deassert(cfg->num_resets, qmp->resets);
+ if (ret) {
+ dev_err(qmp->dev, "reset deassert failed\n");
+ goto err_disable_regulators;
+ }
+
+ ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks);
+ if (ret)
+ goto err_assert_reset;
+
+ qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
+ SW_PWRDN);
+
+ mutex_unlock(&qmp->phy_mutex);
+
+ return 0;
+
+err_assert_reset:
+ reset_control_bulk_assert(cfg->num_resets, qmp->resets);
+err_disable_regulators:
+ regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
+err_decrement_count:
+ qmp->init_count--;
+ mutex_unlock(&qmp->phy_mutex);
+
+ return ret;
+}
+
+static int qmp_pcie_msm8996_com_exit(struct qmp_phy *qphy)
+{
+ struct qcom_qmp *qmp = qphy->qmp;
+ const struct qmp_phy_cfg *cfg = qphy->cfg;
+ void __iomem *serdes = qphy->serdes;
+
+ mutex_lock(&qmp->phy_mutex);
+ if (--qmp->init_count) {
+ mutex_unlock(&qmp->phy_mutex);
+ return 0;
+ }
+
+ qphy_setbits(serdes, cfg->regs[QPHY_COM_START_CONTROL],
+ SERDES_START | PCS_START);
+ qphy_clrbits(serdes, cfg->regs[QPHY_COM_SW_RESET],
+ SW_RESET);
+ qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
+ SW_PWRDN);
+
+ reset_control_bulk_assert(cfg->num_resets, qmp->resets);
+
+ clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
+
+ regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
+
+ mutex_unlock(&qmp->phy_mutex);
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_init(struct phy *phy)
+{
+ struct qmp_phy *qphy = phy_get_drvdata(phy);
+ struct qcom_qmp *qmp = qphy->qmp;
+ int ret;
+ dev_vdbg(qmp->dev, "Initializing QMP phy\n");
+
+ ret = qmp_pcie_msm8996_com_init(qphy);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_power_on(struct phy *phy)
+{
+ struct qmp_phy *qphy = phy_get_drvdata(phy);
+ struct qcom_qmp *qmp = qphy->qmp;
+ const struct qmp_phy_cfg *cfg = qphy->cfg;
+ void __iomem *tx = qphy->tx;
+ void __iomem *rx = qphy->rx;
+ void __iomem *pcs = qphy->pcs;
+ void __iomem *status;
+ unsigned int val;
+ int ret;
+
+ qmp_pcie_msm8996_serdes_init(qphy);
+
+ ret = reset_control_deassert(qphy->lane_rst);
+ if (ret) {
+ dev_err(qmp->dev, "lane%d reset deassert failed\n",
+ qphy->index);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(qphy->pipe_clk);
+ if (ret) {
+ dev_err(qmp->dev, "pipe_clk enable failed err=%d\n", ret);
+ goto err_reset_lane;
+ }
+
+ /* Tx, Rx, and PCS configurations */
+ qmp_pcie_msm8996_configure_lane(tx, cfg->tx_tbl, cfg->tx_tbl_num, 1);
+ qmp_pcie_msm8996_configure_lane(rx, cfg->rx_tbl, cfg->rx_tbl_num, 1);
+ qmp_pcie_msm8996_configure(pcs, cfg->pcs_tbl, cfg->pcs_tbl_num);
+
+ /*
+ * Pull out PHY from POWER DOWN state.
+ * This is active low enable signal to power-down PHY.
+ */
+ qphy_setbits(pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL,
+ SW_PWRDN | REFCLK_DRV_DSBL);
+
+ usleep_range(POWER_DOWN_DELAY_US_MIN, POWER_DOWN_DELAY_US_MAX);
+
+ /* Pull PHY out of reset state */
+ qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
+
+ /* start SerDes and Phy-Coding-Sublayer */
+ qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL],
+ PCS_START | PLL_READY_GATE_EN);
+
+ status = pcs + cfg->regs[QPHY_PCS_STATUS];
+ ret = readl_poll_timeout(status, val, !(val & PHYSTATUS), 200,
+ PHY_INIT_COMPLETE_TIMEOUT);
+ if (ret) {
+ dev_err(qmp->dev, "phy initialization timed-out\n");
+ goto err_disable_pipe_clk;
+ }
+
+ return 0;
+
+err_disable_pipe_clk:
+ clk_disable_unprepare(qphy->pipe_clk);
+err_reset_lane:
+ reset_control_assert(qphy->lane_rst);
+
+ return ret;
+}
+
+static int qmp_pcie_msm8996_power_off(struct phy *phy)
+{
+ struct qmp_phy *qphy = phy_get_drvdata(phy);
+ const struct qmp_phy_cfg *cfg = qphy->cfg;
+
+ clk_disable_unprepare(qphy->pipe_clk);
+
+ /* PHY reset */
+ qphy_setbits(qphy->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
+
+ /* stop SerDes and Phy-Coding-Sublayer */
+ qphy_clrbits(qphy->pcs, cfg->regs[QPHY_START_CTRL],
+ SERDES_START | PCS_START);
+
+ /* Put PHY into POWER DOWN state: active low */
+ qphy_clrbits(qphy->pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL,
+ SW_PWRDN | REFCLK_DRV_DSBL);
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_exit(struct phy *phy)
+{
+ struct qmp_phy *qphy = phy_get_drvdata(phy);
+
+ reset_control_assert(qphy->lane_rst);
+
+ qmp_pcie_msm8996_com_exit(qphy);
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_enable(struct phy *phy)
+{
+ int ret;
+
+ ret = qmp_pcie_msm8996_init(phy);
+ if (ret)
+ return ret;
+
+ ret = qmp_pcie_msm8996_power_on(phy);
+ if (ret)
+ qmp_pcie_msm8996_exit(phy);
+
+ return ret;
+}
+
+static int qmp_pcie_msm8996_disable(struct phy *phy)
+{
+ int ret;
+
+ ret = qmp_pcie_msm8996_power_off(phy);
+ if (ret)
+ return ret;
+ return qmp_pcie_msm8996_exit(phy);
+}
+
+static int qmp_pcie_msm8996_vreg_init(struct device *dev, const struct qmp_phy_cfg *cfg)
+{
+ struct qcom_qmp *qmp = dev_get_drvdata(dev);
+ int num = cfg->num_vregs;
+ int i;
+
+ qmp->vregs = devm_kcalloc(dev, num, sizeof(*qmp->vregs), GFP_KERNEL);
+ if (!qmp->vregs)
+ return -ENOMEM;
+
+ for (i = 0; i < num; i++)
+ qmp->vregs[i].supply = cfg->vreg_list[i];
+
+ return devm_regulator_bulk_get(dev, num, qmp->vregs);
+}
+
+static int qmp_pcie_msm8996_reset_init(struct device *dev, const struct qmp_phy_cfg *cfg)
+{
+ struct qcom_qmp *qmp = dev_get_drvdata(dev);
+ int i;
+ int ret;
+
+ qmp->resets = devm_kcalloc(dev, cfg->num_resets,
+ sizeof(*qmp->resets), GFP_KERNEL);
+ if (!qmp->resets)
+ return -ENOMEM;
+
+ for (i = 0; i < cfg->num_resets; i++)
+ qmp->resets[i].id = cfg->reset_list[i];
+
+ ret = devm_reset_control_bulk_get_exclusive(dev, cfg->num_resets, qmp->resets);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to get resets\n");
+
+ return 0;
+}
+
+static int qmp_pcie_msm8996_clk_init(struct device *dev, const struct qmp_phy_cfg *cfg)
+{
+ struct qcom_qmp *qmp = dev_get_drvdata(dev);
+ int num = cfg->num_clks;
+ int i;
+
+ qmp->clks = devm_kcalloc(dev, num, sizeof(*qmp->clks), GFP_KERNEL);
+ if (!qmp->clks)
+ return -ENOMEM;
+
+ for (i = 0; i < num; i++)
+ qmp->clks[i].id = cfg->clk_list[i];
+
+ return devm_clk_bulk_get(dev, num, qmp->clks);
+}
+
+static void phy_clk_release_provider(void *res)
+{
+ of_clk_del_provider(res);
+}
+
+/*
+ * Register a fixed rate pipe clock.
+ *
+ * The <s>_pipe_clksrc generated by PHY goes to the GCC that gate
+ * controls it. The <s>_pipe_clk coming out of the GCC is requested
+ * by the PHY driver for its operations.
+ * We register the <s>_pipe_clksrc here. The gcc driver takes care
+ * of assigning this <s>_pipe_clksrc as parent to <s>_pipe_clk.
+ * Below picture shows this relationship.
+ *
+ * +---------------+
+ * | PHY block |<<---------------------------------------+
+ * | | |
+ * | +-------+ | +-----+ |
+ * I/P---^-->| PLL |---^--->pipe_clksrc--->| GCC |--->pipe_clk---+
+ * clk | +-------+ | +-----+
+ * +---------------+
+ */
+static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
+{
+ struct clk_fixed_rate *fixed;
+ struct clk_init_data init = { };
+ int ret;
+
+ ret = of_property_read_string(np, "clock-output-names", &init.name);
+ if (ret) {
+ dev_err(qmp->dev, "%pOFn: No clock-output-names\n", np);
+ return ret;
+ }
+
+ fixed = devm_kzalloc(qmp->dev, sizeof(*fixed), GFP_KERNEL);
+ if (!fixed)
+ return -ENOMEM;
+
+ init.ops = &clk_fixed_rate_ops;
+
+ /* controllers using QMP phys use 125MHz pipe clock interface */
+ fixed->fixed_rate = 125000000;
+ fixed->hw.init = &init;
+
+ ret = devm_clk_hw_register(qmp->dev, &fixed->hw);
+ if (ret)
+ return ret;
+
+ ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &fixed->hw);
+ if (ret)
+ return ret;
+
+ /*
+ * Roll a devm action because the clock provider is the child node, but
+ * the child node is not actually a device.
+ */
+ return devm_add_action_or_reset(qmp->dev, phy_clk_release_provider, np);
+}
+
+static const struct phy_ops qmp_pcie_msm8996_ops = {
+ .power_on = qmp_pcie_msm8996_enable,
+ .power_off = qmp_pcie_msm8996_disable,
+ .owner = THIS_MODULE,
+};
+
+static void qcom_qmp_reset_control_put(void *data)
+{
+ reset_control_put(data);
+}
+
+static int qmp_pcie_msm8996_create(struct device *dev, struct device_node *np, int id,
+ void __iomem *serdes, const struct qmp_phy_cfg *cfg)
+{
+ struct qcom_qmp *qmp = dev_get_drvdata(dev);
+ struct phy *generic_phy;
+ struct qmp_phy *qphy;
+ int ret;
+
+ qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
+ if (!qphy)
+ return -ENOMEM;
+
+ qphy->cfg = cfg;
+ qphy->serdes = serdes;
+ /*
+ * Get memory resources for each PHY:
+ * Resources are indexed as: tx -> 0; rx -> 1; pcs -> 2.
+ */
+ qphy->tx = devm_of_iomap(dev, np, 0, NULL);
+ if (IS_ERR(qphy->tx))
+ return PTR_ERR(qphy->tx);
+
+ qphy->rx = devm_of_iomap(dev, np, 1, NULL);
+ if (IS_ERR(qphy->rx))
+ return PTR_ERR(qphy->rx);
+
+ qphy->pcs = devm_of_iomap(dev, np, 2, NULL);
+ if (IS_ERR(qphy->pcs))
+ return PTR_ERR(qphy->pcs);
+
+ qphy->pipe_clk = devm_get_clk_from_child(dev, np, NULL);
+ if (IS_ERR(qphy->pipe_clk)) {
+ return dev_err_probe(dev, PTR_ERR(qphy->pipe_clk),
+ "failed to get lane%d pipe clock\n", id);
+ }
+
+ qphy->lane_rst = of_reset_control_get_exclusive_by_index(np, 0);
+ if (IS_ERR(qphy->lane_rst)) {
+ dev_err(dev, "failed to get lane%d reset\n", id);
+ return PTR_ERR(qphy->lane_rst);
+ }
+ ret = devm_add_action_or_reset(dev, qcom_qmp_reset_control_put,
+ qphy->lane_rst);
+ if (ret)
+ return ret;
+
+ generic_phy = devm_phy_create(dev, np, &qmp_pcie_msm8996_ops);
+ if (IS_ERR(generic_phy)) {
+ ret = PTR_ERR(generic_phy);
+ dev_err(dev, "failed to create qphy %d\n", ret);
+ return ret;
+ }
+
+ qphy->phy = generic_phy;
+ qphy->index = id;
+ qphy->qmp = qmp;
+ qmp->phys[id] = qphy;
+ phy_set_drvdata(generic_phy, qphy);
+
+ return 0;
+}
+
+static const struct of_device_id qmp_pcie_msm8996_of_match_table[] = {
+ {
+ .compatible = "qcom,msm8996-qmp-pcie-phy",
+ .data = &msm8996_pciephy_cfg,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, qmp_pcie_msm8996_of_match_table);
+
+static int qmp_pcie_msm8996_probe(struct platform_device *pdev)
+{
+ struct qcom_qmp *qmp;
+ struct device *dev = &pdev->dev;
+ struct device_node *child;
+ struct phy_provider *phy_provider;
+ void __iomem *serdes;
+ const struct qmp_phy_cfg *cfg = NULL;
+ int num, id, expected_phys;
+ int ret;
+
+ qmp = devm_kzalloc(dev, sizeof(*qmp), GFP_KERNEL);
+ if (!qmp)
+ return -ENOMEM;
+
+ qmp->dev = dev;
+ dev_set_drvdata(dev, qmp);
+
+ cfg = of_device_get_match_data(dev);
+ if (!cfg)
+ return -EINVAL;
+
+ serdes = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(serdes))
+ return PTR_ERR(serdes);
+
+ expected_phys = cfg->num_phys;
+
+ mutex_init(&qmp->phy_mutex);
+
+ ret = qmp_pcie_msm8996_clk_init(dev, cfg);
+ if (ret)
+ return ret;
+
+ ret = qmp_pcie_msm8996_reset_init(dev, cfg);
+ if (ret)
+ return ret;
+
+ ret = qmp_pcie_msm8996_vreg_init(dev, cfg);
+ if (ret)
+ return ret;
+
+ num = of_get_available_child_count(dev->of_node);
+ /* do we have a rogue child node ? */
+ if (num > expected_phys)
+ return -EINVAL;
+
+ qmp->phys = devm_kcalloc(dev, num, sizeof(*qmp->phys), GFP_KERNEL);
+ if (!qmp->phys)
+ return -ENOMEM;
+
+ id = 0;
+ for_each_available_child_of_node(dev->of_node, child) {
+ /* Create per-lane phy */
+ ret = qmp_pcie_msm8996_create(dev, child, id, serdes, cfg);
+ if (ret) {
+ dev_err(dev, "failed to create lane%d phy, %d\n",
+ id, ret);
+ goto err_node_put;
+ }
+
+ /*
+ * Register the pipe clock provided by phy.
+ * See function description to see details of this pipe clock.
+ */
+ ret = phy_pipe_clk_register(qmp, child);
+ if (ret) {
+ dev_err(qmp->dev,
+ "failed to register pipe clock source\n");
+ goto err_node_put;
+ }
+
+ id++;
+ }
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+
+err_node_put:
+ of_node_put(child);
+ return ret;
+}
+
+static struct platform_driver qmp_pcie_msm8996_driver = {
+ .probe = qmp_pcie_msm8996_probe,
+ .driver = {
+ .name = "qcom-qmp-msm8996-pcie-phy",
+ .of_match_table = qmp_pcie_msm8996_of_match_table,
+ },
+};
+
+module_platform_driver(qmp_pcie_msm8996_driver);
+
+MODULE_AUTHOR("Vivek Gautam <vivek.gautam@codeaurora.org>");
+MODULE_DESCRIPTION("Qualcomm QMP MSM8996 PCIe PHY driver");
+MODULE_LICENSE("GPL v2");