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linux-stable/drivers/phy/qualcomm/phy-qcom-qmp-pcie-msm8996.c

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// 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 "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");
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