| // 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_device.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 <dt-bindings/phy/phy.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) |
| #define PHYSTATUS_4_20 BIT(7) |
| /* 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 11 |
| |
| struct qmp_phy_init_tbl { |
| unsigned int offset; |
| unsigned int val; |
| /* |
| * register part of layout ? |
| * if yes, then offset gives index in the reg-layout |
| */ |
| bool in_layout; |
| /* |
| * 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_L(o, v) \ |
| { \ |
| .offset = o, \ |
| .val = v, \ |
| .in_layout = true, \ |
| .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, |
| QPHY_PCS_POWER_DOWN_CONTROL, |
| /* 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] = 0x00, |
| [QPHY_START_CTRL] = 0x08, |
| [QPHY_PCS_STATUS] = 0x174, |
| }; |
| |
| 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; |
| |
| unsigned int start_ctrl; |
| unsigned int pwrdn_ctrl; |
| unsigned int mask_com_pcs_ready; |
| /* bit offset of PHYSTATUS in QPHY_PCS_STATUS register */ |
| unsigned int phy_status; |
| |
| /* true, if PHY needs delay after POWER_DOWN */ |
| bool has_pwrdn_delay; |
| /* power_down delay in usec */ |
| int pwrdn_delay_min; |
| int pwrdn_delay_max; |
| }; |
| |
| /** |
| * 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, |
| |
| .start_ctrl = PCS_START | PLL_READY_GATE_EN, |
| .pwrdn_ctrl = SW_PWRDN | REFCLK_DRV_DSBL, |
| .mask_com_pcs_ready = PCS_READY, |
| .phy_status = PHYSTATUS, |
| |
| .has_pwrdn_delay = true, |
| .pwrdn_delay_min = POWER_DOWN_DELAY_US_MIN, |
| .pwrdn_delay_max = POWER_DOWN_DELAY_US_MAX, |
| }; |
| |
| static void qmp_pcie_msm8996_configure_lane(void __iomem *base, |
| const unsigned int *regs, |
| 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; |
| |
| if (t->in_layout) |
| writel(t->val, base + regs[t->offset]); |
| else |
| writel(t->val, base + t->offset); |
| } |
| } |
| |
| static void qmp_pcie_msm8996_configure(void __iomem *base, |
| const unsigned int *regs, |
| const struct qmp_phy_init_tbl tbl[], |
| int num) |
| { |
| qmp_pcie_msm8996_configure_lane(base, regs, 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 mask, val; |
| int ret; |
| |
| qmp_pcie_msm8996_configure(serdes, cfg->regs, 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]; |
| mask = cfg->mask_com_pcs_ready; |
| |
| ret = readl_poll_timeout(status, val, (val & mask), 10, |
| 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; |
| } |
| |
| /* turn on regulator supplies */ |
| 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_unlock; |
| } |
| |
| 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_unlock: |
| 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 mask, val, ready; |
| 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->regs, cfg->tx_tbl, |
| cfg->tx_tbl_num, 1); |
| |
| qmp_pcie_msm8996_configure_lane(rx, cfg->regs, cfg->rx_tbl, |
| cfg->rx_tbl_num, 1); |
| |
| qmp_pcie_msm8996_configure(pcs, cfg->regs, 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, cfg->pwrdn_ctrl); |
| |
| if (cfg->has_pwrdn_delay) |
| usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_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], cfg->start_ctrl); |
| |
| status = pcs + cfg->regs[QPHY_PCS_STATUS]; |
| mask = cfg->phy_status; |
| ready = 0; |
| |
| ret = readl_poll_timeout(status, val, (val & mask) == ready, 10, |
| 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], cfg->start_ctrl); |
| |
| /* Put PHY into POWER DOWN state: active low */ |
| if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL]) { |
| qphy_clrbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], |
| cfg->pwrdn_ctrl); |
| } else { |
| qphy_clrbits(qphy->pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL, |
| cfg->pwrdn_ctrl); |
| } |
| |
| 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 lane: |
| * 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); |
| |
| /* Get the specific init parameters of QMP phy */ |
| cfg = of_device_get_match_data(dev); |
| if (!cfg) |
| return -EINVAL; |
| |
| /* per PHY serdes; usually located at base address */ |
| 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 dev_err_probe(dev, ret, |
| "failed to get regulator supplies\n"); |
| |
| 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"); |