Reviewed-by: Dov Levenglick <d...@codeaurora.org>
> This change adds a generic and common API support for ufs phy QUALCOMM
> Technologies. This support provides common code and also points
> to specific phy callbacks to differentiate between different behaviors
> of frequent use-cases (like power on, power off, phy calibration etc).
>
> Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>
>
> ---
> drivers/phy/Kconfig | 7 +
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-qcom-ufs-i.h | 118 +++++++
> drivers/phy/phy-qcom-ufs.c | 745
> +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 871 insertions(+)
> create mode 100644 drivers/phy/phy-qcom-ufs-i.h
> create mode 100644 drivers/phy/phy-qcom-ufs.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index ccad880..26a7623 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -277,4 +277,11 @@ config PHY_STIH41X_USB
> Enable this to support the USB transceiver that is part of
> STMicroelectronics STiH41x SoC series.
>
> +config PHY_QCOM_UFS
> + tristate "Qualcomm UFS PHY driver"
> + depends on OF && ARCH_MSM
> + select GENERIC_PHY
> + help
> + Support for UFS PHY on QCOM chipsets.
> +
> endmenu
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index aa74f96..335965d 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -34,3 +34,4 @@ 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_UFS) += phy-qcom-ufs.o
> diff --git a/drivers/phy/phy-qcom-ufs-i.h b/drivers/phy/phy-qcom-ufs-i.h
> new file mode 100644
> index 0000000..dac200f
> --- /dev/null
> +++ b/drivers/phy/phy-qcom-ufs-i.h
> @@ -0,0 +1,118 @@
> +/*
> + * Copyright (c) 2013-2015, 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.
> + *
> + */
> +
> +#ifndef UFS_QCOM_PHY_I_H_
> +#define UFS_QCOM_PHY_I_H_
> +
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +
> +#define UFS_QCOM_PHY_NAME_LEN 30
> +
> +struct ufs_qcom_phy_calibration {
> + u32 reg_offset;
> + u32 cfg_value;
> +};
> +
> +struct ufs_qcom_phy_vreg {
> + const char *name;
> + struct regulator *reg;
> + int max_uA;
> + int min_uV;
> + int max_uV;
> + bool enabled;
> + bool is_always_on;
> +};
> +
> +struct ufs_qcom_phy {
> + struct list_head list;
> + struct device *dev;
> + void __iomem *mmio;
> + void __iomem *dev_ref_clk_ctrl_mmio;
> + struct clk *tx_iface_clk;
> + struct clk *rx_iface_clk;
> + bool is_iface_clk_enabled;
> + struct clk *ref_clk_src;
> + struct clk *ref_clk_parent;
> + struct clk *ref_clk;
> + bool is_ref_clk_enabled;
> + bool is_dev_ref_clk_enabled;
> + struct ufs_qcom_phy_vreg vdda_pll;
> + struct ufs_qcom_phy_vreg vdda_phy;
> + struct ufs_qcom_phy_vreg vddp_ref_clk;
> + unsigned int quirks;
> +
> + /*
> + * If UFS link is put into Hibern8 and if UFS PHY analog hardware
> is
> + * power collapsed (by clearing UFS_PHY_POWER_DOWN_CONTROL),
> Hibern8
> + * exit might fail even after powering on UFS PHY analog hardware.
> + * Enabling this quirk will help to solve above issue by doing
> + * custom PHY settings just before PHY analog power collapse.
> + */
> + #define UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE
> BIT(0)
> +
> + u8 host_ctrl_rev_major;
> + u16 host_ctrl_rev_minor;
> + u16 host_ctrl_rev_step;
> +
> + char name[UFS_QCOM_PHY_NAME_LEN];
> + struct ufs_qcom_phy_calibration *cached_regs;
> + int cached_regs_table_size;
> + bool is_powered_on;
> + struct ufs_qcom_phy_specific_ops *phy_spec_ops;
> +};
> +
> +/**
> + * struct ufs_qcom_phy_specific_ops - set of pointers to functions which
> have a
> + * specific implementation per phy. Each UFS phy, should implement
> + * those functions according to its spec and requirements
> + * @calibrate_phy: pointer to a function that calibrate the phy
> + * @start_serdes: pointer to a function that starts the serdes
> + * @is_physical_coding_sublayer_ready: pointer to a function that
> + * checks pcs readiness. returns 0 for success and non-zero for error.
> + * @set_tx_lane_enable: pointer to a function that enable tx lanes
> + * @power_control: pointer to a function that controls analog rail of phy
> + * and writes to QSERDES_RX_SIGDET_CNTRL attribute
> + */
> +struct ufs_qcom_phy_specific_ops {
> + int (*calibrate_phy)(struct ufs_qcom_phy *phy, bool is_rate_B);
> + void (*start_serdes)(struct ufs_qcom_phy *phy);
> + int (*is_physical_coding_sublayer_ready)(struct ufs_qcom_phy
> *phy);
> + void (*set_tx_lane_enable)(struct ufs_qcom_phy *phy, u32 val);
> + void (*power_control)(struct ufs_qcom_phy *phy, bool val);
> +};
> +
> +struct ufs_qcom_phy *get_ufs_qcom_phy(struct phy *generic_phy);
> +int ufs_qcom_phy_power_on(struct phy *generic_phy);
> +int ufs_qcom_phy_power_off(struct phy *generic_phy);
> +int ufs_qcom_phy_exit(struct phy *generic_phy);
> +int ufs_qcom_phy_init_clks(struct phy *generic_phy,
> + struct ufs_qcom_phy *phy_common);
> +int ufs_qcom_phy_init_vregulators(struct phy *generic_phy,
> + struct ufs_qcom_phy *phy_common);
> +int ufs_qcom_phy_remove(struct phy *generic_phy,
> + struct ufs_qcom_phy *ufs_qcom_phy);
> +struct phy *ufs_qcom_phy_generic_probe(struct platform_device *pdev,
> + struct ufs_qcom_phy *common_cfg,
> + struct phy_ops *ufs_qcom_phy_gen_ops,
> + struct ufs_qcom_phy_specific_ops *phy_spec_ops);
> +int ufs_qcom_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
> + struct ufs_qcom_phy_calibration *tbl_A, int
> tbl_size_A,
> + struct ufs_qcom_phy_calibration *tbl_B, int
> tbl_size_B,
> + bool is_rate_B);
> +#endif
> diff --git a/drivers/phy/phy-qcom-ufs.c b/drivers/phy/phy-qcom-ufs.c
> new file mode 100644
> index 0000000..44ee983
> --- /dev/null
> +++ b/drivers/phy/phy-qcom-ufs.c
> @@ -0,0 +1,745 @@
> +/*
> + * Copyright (c) 2013-2015, 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 "phy-qcom-ufs-i.h"
> +
> +#define MAX_PROP_NAME 32
> +#define VDDA_PHY_MIN_UV 1000000
> +#define VDDA_PHY_MAX_UV 1000000
> +#define VDDA_PLL_MIN_UV 1800000
> +#define VDDA_PLL_MAX_UV 1800000
> +#define VDDP_REF_CLK_MIN_UV 1200000
> +#define VDDP_REF_CLK_MAX_UV 1200000
> +
> +static int __ufs_qcom_phy_init_vreg(struct phy *, struct
> ufs_qcom_phy_vreg *,
> + const char *, bool);
> +static int ufs_qcom_phy_init_vreg(struct phy *, struct ufs_qcom_phy_vreg
> *,
> + const char *);
> +static int ufs_qcom_phy_base_init(struct platform_device *pdev,
> + struct ufs_qcom_phy *phy_common);
> +
> +int ufs_qcom_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
> + struct ufs_qcom_phy_calibration *tbl_A,
> + int tbl_size_A,
> + struct ufs_qcom_phy_calibration *tbl_B,
> + int tbl_size_B, bool is_rate_B)
> +{
> + int i;
> + int ret = 0;
> +
> + if (!tbl_A) {
> + dev_err(ufs_qcom_phy->dev, "%s: tbl_A is NULL", __func__);
> + ret = EINVAL;
> + goto out;
> + }
> +
> + for (i = 0; i < tbl_size_A; i++)
> + writel_relaxed(tbl_A[i].cfg_value,
> + ufs_qcom_phy->mmio + tbl_A[i].reg_offset);
> +
> + /*
> + * In case we would like to work in rate B, we need
> + * to override a registers that were configured in rate A table
> + * with registers of rate B table.
> + * table.
> + */
> + if (is_rate_B) {
> + if (!tbl_B) {
> + dev_err(ufs_qcom_phy->dev, "%s: tbl_B is NULL",
> + __func__);
> + ret = EINVAL;
> + goto out;
> + }
> +
> + for (i = 0; i < tbl_size_B; i++)
> + writel_relaxed(tbl_B[i].cfg_value,
> + ufs_qcom_phy->mmio + tbl_B[i].reg_offset);
> + }
> +
> + /* flush buffered writes */
> + mb();
> +
> +out:
> + return ret;
> +}
> +
> +struct phy *ufs_qcom_phy_generic_probe(struct platform_device *pdev,
> + struct ufs_qcom_phy *common_cfg,
> + struct phy_ops *ufs_qcom_phy_gen_ops,
> + struct ufs_qcom_phy_specific_ops
> *phy_spec_ops)
> +{
> + int err;
> + struct device *dev = &pdev->dev;
> + struct phy *generic_phy = NULL;
> + struct phy_provider *phy_provider;
> +
> + err = ufs_qcom_phy_base_init(pdev, common_cfg);
> + if (err) {
> + dev_err(dev, "%s: phy base init failed %d\n", __func__,
> err);
> + goto out;
> + }
> +
> + phy_provider = devm_of_phy_provider_register(dev,
> of_phy_simple_xlate);
> + if (IS_ERR(phy_provider)) {
> + err = PTR_ERR(phy_provider);
> + dev_err(dev, "%s: failed to register phy %d\n", __func__,
> err);
> + goto out;
> + }
> +
> + generic_phy = devm_phy_create(dev, NULL, ufs_qcom_phy_gen_ops);
> + if (IS_ERR(generic_phy)) {
> + err = PTR_ERR(generic_phy);
> + dev_err(dev, "%s: failed to create phy %d\n", __func__,
> err);
> + goto out;
> + }
> +
> + common_cfg->phy_spec_ops = phy_spec_ops;
> + common_cfg->dev = dev;
> +
> +out:
> + return generic_phy;
> +}
> +
> +/*
> + * This assumes the embedded phy structure inside generic_phy is of type
> + * struct ufs_qcom_phy. In order to function properly it's crucial
> + * to keep the embedded struct "struct ufs_qcom_phy common_cfg"
> + * as the first inside generic_phy.
> + */
> +struct ufs_qcom_phy *get_ufs_qcom_phy(struct phy *generic_phy)
> +{
> + return (struct ufs_qcom_phy *)phy_get_drvdata(generic_phy);
> +}
> +
> +static
> +int ufs_qcom_phy_base_init(struct platform_device *pdev,
> + struct ufs_qcom_phy *phy_common)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + int err = 0;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "phy_mem");
> + if (!res) {
> + dev_err(dev, "%s: phy_mem resource not found\n",
> __func__);
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + phy_common->mmio = devm_ioremap_resource(dev, res);
> + if (IS_ERR((void const *)phy_common->mmio)) {
> + err = PTR_ERR((void const *)phy_common->mmio);
> + phy_common->mmio = NULL;
> + dev_err(dev, "%s: ioremap for phy_mem resource failed
> %d\n",
> + __func__, err);
> + goto out;
> + }
> +
> + /* "dev_ref_clk_ctrl_mem" is optional resource */
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "dev_ref_clk_ctrl_mem");
> + if (!res) {
> + dev_dbg(dev, "%s: dev_ref_clk_ctrl_mem resource not
> found\n",
> + __func__);
> + goto out;
> + }
> +
> + phy_common->dev_ref_clk_ctrl_mmio = devm_ioremap_resource(dev,
> res);
> + if (IS_ERR((void const *)phy_common->dev_ref_clk_ctrl_mmio)) {
> + err = PTR_ERR((void const
> *)phy_common->dev_ref_clk_ctrl_mmio);
> + phy_common->dev_ref_clk_ctrl_mmio = NULL;
> + dev_err(dev, "%s: ioremap for dev_ref_clk_ctrl_mem
> resource failed %d\n",
> + __func__, err);
> + }
> +
> +out:
> + return err;
> +}
> +
> +static int __ufs_qcom_phy_clk_get(struct phy *phy,
> + const char *name, struct clk **clk_out, bool
> err_print)
> +{
> + struct clk *clk;
> + int err = 0;
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
> + struct device *dev = ufs_qcom_phy->dev;
> +
> + clk = devm_clk_get(dev, name);
> + if (IS_ERR(clk)) {
> + err = PTR_ERR(clk);
> + if (err_print)
> + dev_err(dev, "failed to get %s err %d", name,
> err);
> + } else {
> + *clk_out = clk;
> + }
> +
> + return err;
> +}
> +
> +static
> +int ufs_qcom_phy_clk_get(struct phy *phy,
> + const char *name, struct clk **clk_out)
> +{
> + return __ufs_qcom_phy_clk_get(phy, name, clk_out, true);
> +}
> +
> +int
> +ufs_qcom_phy_init_clks(struct phy *generic_phy,
> + struct ufs_qcom_phy *phy_common)
> +{
> + int err;
> +
> + err = ufs_qcom_phy_clk_get(generic_phy, "tx_iface_clk",
> + &phy_common->tx_iface_clk);
> + if (err)
> + goto out;
> +
> + err = ufs_qcom_phy_clk_get(generic_phy, "rx_iface_clk",
> + &phy_common->rx_iface_clk);
> + if (err)
> + goto out;
> +
> + err = ufs_qcom_phy_clk_get(generic_phy, "ref_clk_src",
> + &phy_common->ref_clk_src);
> + if (err)
> + goto out;
> +
> + /*
> + * "ref_clk_parent" is optional hence don't abort init if it's not
> + * found.
> + */
> + __ufs_qcom_phy_clk_get(generic_phy, "ref_clk_parent",
> + &phy_common->ref_clk_parent, false);
> +
> + err = ufs_qcom_phy_clk_get(generic_phy, "ref_clk",
> + &phy_common->ref_clk);
> +
> +out:
> + return err;
> +}
> +
> +int
> +ufs_qcom_phy_init_vregulators(struct phy *generic_phy,
> + struct ufs_qcom_phy *phy_common)
> +{
> + int err;
> +
> + err = ufs_qcom_phy_init_vreg(generic_phy, &phy_common->vdda_pll,
> + "vdda-pll");
> + if (err)
> + goto out;
> +
> + err = ufs_qcom_phy_init_vreg(generic_phy, &phy_common->vdda_phy,
> + "vdda-phy");
> +
> + if (err)
> + goto out;
> +
> + /* vddp-ref-clk-* properties are optional */
> + __ufs_qcom_phy_init_vreg(generic_phy, &phy_common->vddp_ref_clk,
> + "vddp-ref-clk", true);
> +out:
> + return err;
> +}
> +
> +static int __ufs_qcom_phy_init_vreg(struct phy *phy,
> + struct ufs_qcom_phy_vreg *vreg, const char *name, bool
> optional)
> +{
> + int err = 0;
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
> + struct device *dev = ufs_qcom_phy->dev;
> +
> + char prop_name[MAX_PROP_NAME];
> +
> + vreg->name = kstrdup(name, GFP_KERNEL);
> + if (!vreg->name) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + vreg->reg = devm_regulator_get(dev, name);
> + if (IS_ERR(vreg->reg)) {
> + err = PTR_ERR(vreg->reg);
> + vreg->reg = NULL;
> + if (!optional)
> + dev_err(dev, "failed to get %s, %d\n", name, err);
> + goto out;
> + }
> +
> + if (dev->of_node) {
> + snprintf(prop_name, MAX_PROP_NAME, "%s-max-microamp",
> name);
> + err = of_property_read_u32(dev->of_node,
> + prop_name, &vreg->max_uA);
> + if (err && err != -EINVAL) {
> + dev_err(dev, "%s: failed to read %s\n",
> + __func__, prop_name);
> + goto out;
> + } else if (err == -EINVAL || !vreg->max_uA) {
> + if (regulator_count_voltages(vreg->reg) > 0) {
> + dev_err(dev, "%s: %s is mandatory\n",
> + __func__, prop_name);
> + goto out;
> + }
> + err = 0;
> + }
> + snprintf(prop_name, MAX_PROP_NAME, "%s-always-on", name);
> + if (of_get_property(dev->of_node, prop_name, NULL))
> + vreg->is_always_on = true;
> + else
> + vreg->is_always_on = false;
> + }
> +
> + if (!strcmp(name, "vdda-pll")) {
> + vreg->max_uV = VDDA_PLL_MAX_UV;
> + vreg->min_uV = VDDA_PLL_MIN_UV;
> + } else if (!strcmp(name, "vdda-phy")) {
> + vreg->max_uV = VDDA_PHY_MAX_UV;
> + vreg->min_uV = VDDA_PHY_MIN_UV;
> + } else if (!strcmp(name, "vddp-ref-clk")) {
> + vreg->max_uV = VDDP_REF_CLK_MAX_UV;
> + vreg->min_uV = VDDP_REF_CLK_MIN_UV;
> + }
> +
> +out:
> + if (err)
> + kfree(vreg->name);
> + return err;
> +}
> +
> +static int ufs_qcom_phy_init_vreg(struct phy *phy,
> + struct ufs_qcom_phy_vreg *vreg, const char *name)
> +{
> + return __ufs_qcom_phy_init_vreg(phy, vreg, name, false);
> +}
> +
> +static
> +int ufs_qcom_phy_cfg_vreg(struct phy *phy,
> + struct ufs_qcom_phy_vreg *vreg, bool on)
> +{
> + int ret = 0;
> + struct regulator *reg = vreg->reg;
> + const char *name = vreg->name;
> + int min_uV;
> + int uA_load;
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
> + struct device *dev = ufs_qcom_phy->dev;
> +
> + BUG_ON(!vreg);
> +
> + if (regulator_count_voltages(reg) > 0) {
> + min_uV = on ? vreg->min_uV : 0;
> + ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
> + if (ret) {
> + dev_err(dev, "%s: %s set voltage failed,
> err=%d\n",
> + __func__, name, ret);
> + goto out;
> + }
> + uA_load = on ? vreg->max_uA : 0;
> + ret = regulator_set_optimum_mode(reg, uA_load);
> + if (ret >= 0) {
> + /*
> + * regulator_set_optimum_mode() returns new
> regulator
> + * mode upon success.
> + */
> + ret = 0;
> + } else {
> + dev_err(dev, "%s: %s set optimum mode(uA_load=%d)
> failed, err=%d\n",
> + __func__, name, uA_load, ret);
> + goto out;
> + }
> + }
> +out:
> + return ret;
> +}
> +
> +static
> +int ufs_qcom_phy_enable_vreg(struct phy *phy,
> + struct ufs_qcom_phy_vreg *vreg)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
> + struct device *dev = ufs_qcom_phy->dev;
> + int ret = 0;
> +
> + if (!vreg || vreg->enabled)
> + goto out;
> +
> + ret = ufs_qcom_phy_cfg_vreg(phy, vreg, true);
> + if (ret) {
> + dev_err(dev, "%s: ufs_qcom_phy_cfg_vreg() failed,
> err=%d\n",
> + __func__, ret);
> + goto out;
> + }
> +
> + ret = regulator_enable(vreg->reg);
> + if (ret) {
> + dev_err(dev, "%s: enable failed, err=%d\n",
> + __func__, ret);
> + goto out;
> + }
> +
> + vreg->enabled = true;
> +out:
> + return ret;
> +}
> +
> +int ufs_qcom_phy_enable_ref_clk(struct phy *generic_phy)
> +{
> + int ret = 0;
> + struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
> +
> + if (phy->is_ref_clk_enabled)
> + goto out;
> +
> + /*
> + * reference clock is propagated in a daisy-chained manner from
> + * source to phy, so ungate them at each stage.
> + */
> + ret = clk_prepare_enable(phy->ref_clk_src);
> + if (ret) {
> + dev_err(phy->dev, "%s: ref_clk_src enable failed %d\n",
> + __func__, ret);
> + goto out;
> + }
> +
> + /*
> + * "ref_clk_parent" is optional clock hence make sure that clk
> reference
> + * is available before trying to enable the clock.
> + */
> + if (phy->ref_clk_parent) {
> + ret = clk_prepare_enable(phy->ref_clk_parent);
> + if (ret) {
> + dev_err(phy->dev, "%s: ref_clk_parent enable
> failed %d\n",
> + __func__, ret);
> + goto out_disable_src;
> + }
> + }
> +
> + ret = clk_prepare_enable(phy->ref_clk);
> + if (ret) {
> + dev_err(phy->dev, "%s: ref_clk enable failed %d\n",
> + __func__, ret);
> + goto out_disable_parent;
> + }
> +
> + phy->is_ref_clk_enabled = true;
> + goto out;
> +
> +out_disable_parent:
> + if (phy->ref_clk_parent)
> + clk_disable_unprepare(phy->ref_clk_parent);
> +out_disable_src:
> + clk_disable_unprepare(phy->ref_clk_src);
> +out:
> + return ret;
> +}
> +
> +static
> +int ufs_qcom_phy_disable_vreg(struct phy *phy,
> + struct ufs_qcom_phy_vreg *vreg)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(phy);
> + struct device *dev = ufs_qcom_phy->dev;
> + int ret = 0;
> +
> + if (!vreg || !vreg->enabled || vreg->is_always_on)
> + goto out;
> +
> + ret = regulator_disable(vreg->reg);
> +
> + if (!ret) {
> + /* ignore errors on applying disable config */
> + ufs_qcom_phy_cfg_vreg(phy, vreg, false);
> + vreg->enabled = false;
> + } else {
> + dev_err(dev, "%s: %s disable failed, err=%d\n",
> + __func__, vreg->name, ret);
> + }
> +out:
> + return ret;
> +}
> +
> +void ufs_qcom_phy_disable_ref_clk(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
> +
> + if (phy->is_ref_clk_enabled) {
> + clk_disable_unprepare(phy->ref_clk);
> + /*
> + * "ref_clk_parent" is optional clock hence make sure that
> clk
> + * reference is available before trying to disable the
> clock.
> + */
> + if (phy->ref_clk_parent)
> + clk_disable_unprepare(phy->ref_clk_parent);
> + clk_disable_unprepare(phy->ref_clk_src);
> + phy->is_ref_clk_enabled = false;
> + }
> +}
> +
> +#define UFS_REF_CLK_EN (1 << 5)
> +
> +static void ufs_qcom_phy_dev_ref_clk_ctrl(struct phy *generic_phy, bool
> enable)
> +{
> + struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
> +
> + if (phy->dev_ref_clk_ctrl_mmio &&
> + (enable ^ phy->is_dev_ref_clk_enabled)) {
> + u32 temp = readl_relaxed(phy->dev_ref_clk_ctrl_mmio);
> +
> + if (enable)
> + temp |= UFS_REF_CLK_EN;
> + else
> + temp &= ~UFS_REF_CLK_EN;
> +
> + /*
> + * If we are here to disable this clock immediately after
> + * entering into hibern8, we need to make sure that device
> + * ref_clk is active atleast 1us after the hibern8 enter.
> + */
> + if (!enable)
> + udelay(1);
> +
> + writel_relaxed(temp, phy->dev_ref_clk_ctrl_mmio);
> + /* ensure that ref_clk is enabled/disabled before we
> return */
> + wmb();
> + /*
> + * If we call hibern8 exit after this, we need to make
> sure that
> + * device ref_clk is stable for atleast 1us before the
> hibern8
> + * exit command.
> + */
> + if (enable)
> + udelay(1);
> +
> + phy->is_dev_ref_clk_enabled = enable;
> + }
> +}
> +
> +void ufs_qcom_phy_enable_dev_ref_clk(struct phy *generic_phy)
> +{
> + ufs_qcom_phy_dev_ref_clk_ctrl(generic_phy, true);
> +}
> +
> +void ufs_qcom_phy_disable_dev_ref_clk(struct phy *generic_phy)
> +{
> + ufs_qcom_phy_dev_ref_clk_ctrl(generic_phy, false);
> +}
> +
> +/* Turn ON M-PHY RMMI interface clocks */
> +int ufs_qcom_phy_enable_iface_clk(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
> + int ret = 0;
> +
> + if (phy->is_iface_clk_enabled)
> + goto out;
> +
> + ret = clk_prepare_enable(phy->tx_iface_clk);
> + if (ret) {
> + dev_err(phy->dev, "%s: tx_iface_clk enable failed %d\n",
> + __func__, ret);
> + goto out;
> + }
> + ret = clk_prepare_enable(phy->rx_iface_clk);
> + if (ret) {
> + clk_disable_unprepare(phy->tx_iface_clk);
> + dev_err(phy->dev, "%s: rx_iface_clk enable failed %d.
> disabling also tx_iface_clk\n",
> + __func__, ret);
> + goto out;
> + }
> + phy->is_iface_clk_enabled = true;
> +
> +out:
> + return ret;
> +}
> +
> +/* Turn OFF M-PHY RMMI interface clocks */
> +void ufs_qcom_phy_disable_iface_clk(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
> +
> + if (phy->is_iface_clk_enabled) {
> + clk_disable_unprepare(phy->tx_iface_clk);
> + clk_disable_unprepare(phy->rx_iface_clk);
> + phy->is_iface_clk_enabled = false;
> + }
> +}
> +
> +int ufs_qcom_phy_start_serdes(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> + int ret = 0;
> +
> + if (!ufs_qcom_phy->phy_spec_ops->start_serdes) {
> + dev_err(ufs_qcom_phy->dev, "%s: start_serdes() callback is
> not supported\n",
> + __func__);
> + ret = -ENOTSUPP;
> + } else {
> + ufs_qcom_phy->phy_spec_ops->start_serdes(ufs_qcom_phy);
> + }
> +
> + return ret;
> +}
> +
> +int ufs_qcom_phy_set_tx_lane_enable(struct phy *generic_phy, u32
> tx_lanes)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> + int ret = 0;
> +
> + if (!ufs_qcom_phy->phy_spec_ops->set_tx_lane_enable) {
> + dev_err(ufs_qcom_phy->dev, "%s: set_tx_lane_enable()
> callback is not supported\n",
> + __func__);
> + ret = -ENOTSUPP;
> + } else {
> +
> ufs_qcom_phy->phy_spec_ops->set_tx_lane_enable(ufs_qcom_phy,
> + tx_lanes);
> + }
> +
> + return ret;
> +}
> +
> +void ufs_qcom_phy_save_controller_version(struct phy *generic_phy,
> + u8 major, u16 minor, u16 step)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> +
> + ufs_qcom_phy->host_ctrl_rev_major = major;
> + ufs_qcom_phy->host_ctrl_rev_minor = minor;
> + ufs_qcom_phy->host_ctrl_rev_step = step;
> +}
> +
> +int ufs_qcom_phy_calibrate_phy(struct phy *generic_phy, bool is_rate_B)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> + int ret = 0;
> +
> + if (!ufs_qcom_phy->phy_spec_ops->calibrate_phy) {
> + dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy() callback
> is not supported\n",
> + __func__);
> + ret = -ENOTSUPP;
> + } else {
> + ret = ufs_qcom_phy->phy_spec_ops->
> + calibrate_phy(ufs_qcom_phy, is_rate_B);
> + if (ret)
> + dev_err(ufs_qcom_phy->dev, "%s: calibrate_phy()
> failed %d\n",
> + __func__, ret);
> + }
> +
> + return ret;
> +}
> +
> +int ufs_qcom_phy_remove(struct phy *generic_phy,
> + struct ufs_qcom_phy *ufs_qcom_phy)
> +{
> + phy_power_off(generic_phy);
> +
> + kfree(ufs_qcom_phy->vdda_pll.name);
> + kfree(ufs_qcom_phy->vdda_phy.name);
> +
> + return 0;
> +}
> +
> +int ufs_qcom_phy_exit(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> +
> + if (ufs_qcom_phy->is_powered_on)
> + phy_power_off(generic_phy);
> +
> + return 0;
> +}
> +
> +int ufs_qcom_phy_is_pcs_ready(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
> +
> + if
> (!ufs_qcom_phy->phy_spec_ops->is_physical_coding_sublayer_ready) {
> + dev_err(ufs_qcom_phy->dev, "%s:
> is_physical_coding_sublayer_ready() callback is not supported\n",
> + __func__);
> + return -ENOTSUPP;
> + }
> +
> + return ufs_qcom_phy->phy_spec_ops->
> + is_physical_coding_sublayer_ready(ufs_qcom_phy);
> +}
> +
> +int ufs_qcom_phy_power_on(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
> + struct device *dev = phy_common->dev;
> + int err;
> +
> + err = ufs_qcom_phy_enable_vreg(generic_phy,
> &phy_common->vdda_phy);
> + if (err) {
> + dev_err(dev, "%s enable vdda_phy failed, err=%d\n",
> + __func__, err);
> + goto out;
> + }
> +
> + phy_common->phy_spec_ops->power_control(phy_common, true);
> +
> + /* vdda_pll also enables ref clock LDOs so enable it first */
> + err = ufs_qcom_phy_enable_vreg(generic_phy,
> &phy_common->vdda_pll);
> + if (err) {
> + dev_err(dev, "%s enable vdda_pll failed, err=%d\n",
> + __func__, err);
> + goto out_disable_phy;
> + }
> +
> + err = ufs_qcom_phy_enable_ref_clk(generic_phy);
> + if (err) {
> + dev_err(dev, "%s enable phy ref clock failed, err=%d\n",
> + __func__, err);
> + goto out_disable_pll;
> + }
> +
> + /* enable device PHY ref_clk pad rail */
> + if (phy_common->vddp_ref_clk.reg) {
> + err = ufs_qcom_phy_enable_vreg(generic_phy,
> + &phy_common->vddp_ref_clk);
> + if (err) {
> + dev_err(dev, "%s enable vddp_ref_clk failed,
> err=%d\n",
> + __func__, err);
> + goto out_disable_ref_clk;
> + }
> + }
> +
> + phy_common->is_powered_on = true;
> + goto out;
> +
> +out_disable_ref_clk:
> + ufs_qcom_phy_disable_ref_clk(generic_phy);
> +out_disable_pll:
> + ufs_qcom_phy_disable_vreg(generic_phy, &phy_common->vdda_pll);
> +out_disable_phy:
> + ufs_qcom_phy_disable_vreg(generic_phy, &phy_common->vdda_phy);
> +out:
> + return err;
> +}
> +
> +int ufs_qcom_phy_power_off(struct phy *generic_phy)
> +{
> + struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
> +
> + phy_common->phy_spec_ops->power_control(phy_common, false);
> +
> + if (phy_common->vddp_ref_clk.reg)
> + ufs_qcom_phy_disable_vreg(generic_phy,
> + &phy_common->vddp_ref_clk);
> + ufs_qcom_phy_disable_ref_clk(generic_phy);
> +
> + ufs_qcom_phy_disable_vreg(generic_phy, &phy_common->vdda_pll);
> + ufs_qcom_phy_disable_vreg(generic_phy, &phy_common->vdda_phy);
> + phy_common->is_powered_on = false;
> +
> + return 0;
> +}
> --
> 1.8.5.2
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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