diff options
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/qualcomm/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/phy/qualcomm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/phy/qualcomm/phy-qcom-usb-hs-28nm.c | 415 |
3 files changed, 427 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig index e46824da29f6..9c56a7216f72 100644 --- a/drivers/phy/qualcomm/Kconfig +++ b/drivers/phy/qualcomm/Kconfig @@ -91,3 +91,14 @@ config PHY_QCOM_USB_HSIC select GENERIC_PHY help Support for the USB HSIC ULPI compliant PHY on QCOM chipsets. + +config PHY_QCOM_USB_HS_28NM + tristate "Qualcomm 28nm High-Speed PHY" + depends on ARCH_QCOM || COMPILE_TEST + depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in + select GENERIC_PHY + help + Enable this to support the Qualcomm Synopsys DesignWare Core 28nm + High-Speed PHY driver. This driver supports the Hi-Speed PHY which + is usually paired with either the ChipIdea or Synopsys DWC3 USB + IPs on MSM SOCs. diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile index 283251d6a5d9..a4dab5329de0 100644 --- a/drivers/phy/qualcomm/Makefile +++ b/drivers/phy/qualcomm/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_PHY_QCOM_UFS_14NM) += phy-qcom-ufs-qmp-14nm.o obj-$(CONFIG_PHY_QCOM_UFS_20NM) += phy-qcom-ufs-qmp-20nm.o obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o +obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o diff --git a/drivers/phy/qualcomm/phy-qcom-usb-hs-28nm.c b/drivers/phy/qualcomm/phy-qcom-usb-hs-28nm.c new file mode 100644 index 000000000000..d998e65c89c8 --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-usb-hs-28nm.c @@ -0,0 +1,415 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2009-2018, Linux Foundation. All rights reserved. + * Copyright (c) 2018-2020, Linaro Limited + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/reset.h> +#include <linux/slab.h> + +/* PHY register and bit definitions */ +#define PHY_CTRL_COMMON0 0x078 +#define SIDDQ BIT(2) +#define PHY_IRQ_CMD 0x0d0 +#define PHY_INTR_MASK0 0x0d4 +#define PHY_INTR_CLEAR0 0x0dc +#define DPDM_MASK 0x1e +#define DP_1_0 BIT(4) +#define DP_0_1 BIT(3) +#define DM_1_0 BIT(2) +#define DM_0_1 BIT(1) + +enum hsphy_voltage { + VOL_NONE, + VOL_MIN, + VOL_MAX, + VOL_NUM, +}; + +enum hsphy_vreg { + VDD, + VDDA_1P8, + VDDA_3P3, + VREG_NUM, +}; + +struct hsphy_init_seq { + int offset; + int val; + int delay; +}; + +struct hsphy_data { + const struct hsphy_init_seq *init_seq; + unsigned int init_seq_num; +}; + +struct hsphy_priv { + void __iomem *base; + struct clk_bulk_data *clks; + int num_clks; + struct reset_control *phy_reset; + struct reset_control *por_reset; + struct regulator_bulk_data vregs[VREG_NUM]; + const struct hsphy_data *data; + enum phy_mode mode; +}; + +static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode, + int submode) +{ + struct hsphy_priv *priv = phy_get_drvdata(phy); + + priv->mode = PHY_MODE_INVALID; + + if (mode > 0) + priv->mode = mode; + + return 0; +} + +static void qcom_snps_hsphy_enable_hv_interrupts(struct hsphy_priv *priv) +{ + u32 val; + + /* Clear any existing interrupts before enabling the interrupts */ + val = readb(priv->base + PHY_INTR_CLEAR0); + val |= DPDM_MASK; + writeb(val, priv->base + PHY_INTR_CLEAR0); + + writeb(0x0, priv->base + PHY_IRQ_CMD); + usleep_range(200, 220); + writeb(0x1, priv->base + PHY_IRQ_CMD); + + /* Make sure the interrupts are cleared */ + usleep_range(200, 220); + + val = readb(priv->base + PHY_INTR_MASK0); + switch (priv->mode) { + case PHY_MODE_USB_HOST_HS: + case PHY_MODE_USB_HOST_FS: + case PHY_MODE_USB_DEVICE_HS: + case PHY_MODE_USB_DEVICE_FS: + val |= DP_1_0 | DM_0_1; + break; + case PHY_MODE_USB_HOST_LS: + case PHY_MODE_USB_DEVICE_LS: + val |= DP_0_1 | DM_1_0; + break; + default: + /* No device connected */ + val |= DP_0_1 | DM_0_1; + break; + } + writeb(val, priv->base + PHY_INTR_MASK0); +} + +static void qcom_snps_hsphy_disable_hv_interrupts(struct hsphy_priv *priv) +{ + u32 val; + + val = readb(priv->base + PHY_INTR_MASK0); + val &= ~DPDM_MASK; + writeb(val, priv->base + PHY_INTR_MASK0); + + /* Clear any pending interrupts */ + val = readb(priv->base + PHY_INTR_CLEAR0); + val |= DPDM_MASK; + writeb(val, priv->base + PHY_INTR_CLEAR0); + + writeb(0x0, priv->base + PHY_IRQ_CMD); + usleep_range(200, 220); + + writeb(0x1, priv->base + PHY_IRQ_CMD); + usleep_range(200, 220); +} + +static void qcom_snps_hsphy_enter_retention(struct hsphy_priv *priv) +{ + u32 val; + + val = readb(priv->base + PHY_CTRL_COMMON0); + val |= SIDDQ; + writeb(val, priv->base + PHY_CTRL_COMMON0); +} + +static void qcom_snps_hsphy_exit_retention(struct hsphy_priv *priv) +{ + u32 val; + + val = readb(priv->base + PHY_CTRL_COMMON0); + val &= ~SIDDQ; + writeb(val, priv->base + PHY_CTRL_COMMON0); +} + +static int qcom_snps_hsphy_power_on(struct phy *phy) +{ + struct hsphy_priv *priv = phy_get_drvdata(phy); + int ret; + + ret = regulator_bulk_enable(VREG_NUM, priv->vregs); + if (ret) + return ret; + ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks); + if (ret) + goto err_disable_regulator; + qcom_snps_hsphy_disable_hv_interrupts(priv); + qcom_snps_hsphy_exit_retention(priv); + + return 0; + +err_disable_regulator: + regulator_bulk_disable(VREG_NUM, priv->vregs); + + return ret; +} + +static int qcom_snps_hsphy_power_off(struct phy *phy) +{ + struct hsphy_priv *priv = phy_get_drvdata(phy); + + qcom_snps_hsphy_enter_retention(priv); + qcom_snps_hsphy_enable_hv_interrupts(priv); + clk_bulk_disable_unprepare(priv->num_clks, priv->clks); + regulator_bulk_disable(VREG_NUM, priv->vregs); + + return 0; +} + +static int qcom_snps_hsphy_reset(struct hsphy_priv *priv) +{ + int ret; + + ret = reset_control_assert(priv->phy_reset); + if (ret) + return ret; + + usleep_range(10, 15); + + ret = reset_control_deassert(priv->phy_reset); + if (ret) + return ret; + + usleep_range(80, 100); + + return 0; +} + +static void qcom_snps_hsphy_init_sequence(struct hsphy_priv *priv) +{ + const struct hsphy_data *data = priv->data; + const struct hsphy_init_seq *seq; + int i; + + /* Device match data is optional. */ + if (!data) + return; + + seq = data->init_seq; + + for (i = 0; i < data->init_seq_num; i++, seq++) { + writeb(seq->val, priv->base + seq->offset); + if (seq->delay) + usleep_range(seq->delay, seq->delay + 10); + } +} + +static int qcom_snps_hsphy_por_reset(struct hsphy_priv *priv) +{ + int ret; + + ret = reset_control_assert(priv->por_reset); + if (ret) + return ret; + + /* + * The Femto PHY is POR reset in the following scenarios. + * + * 1. After overriding the parameter registers. + * 2. Low power mode exit from PHY retention. + * + * Ensure that SIDDQ is cleared before bringing the PHY + * out of reset. + */ + qcom_snps_hsphy_exit_retention(priv); + + /* + * As per databook, 10 usec delay is required between + * PHY POR assert and de-assert. + */ + usleep_range(10, 20); + ret = reset_control_deassert(priv->por_reset); + if (ret) + return ret; + + /* + * As per databook, it takes 75 usec for PHY to stabilize + * after the reset. + */ + usleep_range(80, 100); + + return 0; +} + +static int qcom_snps_hsphy_init(struct phy *phy) +{ + struct hsphy_priv *priv = phy_get_drvdata(phy); + int ret; + + ret = qcom_snps_hsphy_reset(priv); + if (ret) + return ret; + + qcom_snps_hsphy_init_sequence(priv); + + ret = qcom_snps_hsphy_por_reset(priv); + if (ret) + return ret; + + return 0; +} + +static const struct phy_ops qcom_snps_hsphy_ops = { + .init = qcom_snps_hsphy_init, + .power_on = qcom_snps_hsphy_power_on, + .power_off = qcom_snps_hsphy_power_off, + .set_mode = qcom_snps_hsphy_set_mode, + .owner = THIS_MODULE, +}; + +static const char * const qcom_snps_hsphy_clks[] = { + "ref", + "ahb", + "sleep", +}; + +static int qcom_snps_hsphy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy_provider *provider; + struct hsphy_priv *priv; + struct phy *phy; + int ret; + int i; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->num_clks = ARRAY_SIZE(qcom_snps_hsphy_clks); + priv->clks = devm_kcalloc(dev, priv->num_clks, sizeof(*priv->clks), + GFP_KERNEL); + if (!priv->clks) + return -ENOMEM; + + for (i = 0; i < priv->num_clks; i++) + priv->clks[i].id = qcom_snps_hsphy_clks[i]; + + ret = devm_clk_bulk_get(dev, priv->num_clks, priv->clks); + if (ret) + return ret; + + priv->phy_reset = devm_reset_control_get_exclusive(dev, "phy"); + if (IS_ERR(priv->phy_reset)) + return PTR_ERR(priv->phy_reset); + + priv->por_reset = devm_reset_control_get_exclusive(dev, "por"); + if (IS_ERR(priv->por_reset)) + return PTR_ERR(priv->por_reset); + + priv->vregs[VDD].supply = "vdd"; + priv->vregs[VDDA_1P8].supply = "vdda1p8"; + priv->vregs[VDDA_3P3].supply = "vdda3p3"; + + ret = devm_regulator_bulk_get(dev, VREG_NUM, priv->vregs); + if (ret) + return ret; + + /* Get device match data */ + priv->data = device_get_match_data(dev); + + phy = devm_phy_create(dev, dev->of_node, &qcom_snps_hsphy_ops); + if (IS_ERR(phy)) + return PTR_ERR(phy); + + phy_set_drvdata(phy, priv); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) + return PTR_ERR(provider); + + ret = regulator_set_load(priv->vregs[VDDA_1P8].consumer, 19000); + if (ret < 0) + return ret; + + ret = regulator_set_load(priv->vregs[VDDA_3P3].consumer, 16000); + if (ret < 0) + goto unset_1p8_load; + + return 0; + +unset_1p8_load: + regulator_set_load(priv->vregs[VDDA_1P8].consumer, 0); + + return ret; +} + +/* + * The macro is used to define an initialization sequence. Each tuple + * is meant to program 'value' into phy register at 'offset' with 'delay' + * in us followed. + */ +#define HSPHY_INIT_CFG(o, v, d) { .offset = o, .val = v, .delay = d, } + +static const struct hsphy_init_seq init_seq_femtophy[] = { + HSPHY_INIT_CFG(0xc0, 0x01, 0), + HSPHY_INIT_CFG(0xe8, 0x0d, 0), + HSPHY_INIT_CFG(0x74, 0x12, 0), + HSPHY_INIT_CFG(0x98, 0x63, 0), + HSPHY_INIT_CFG(0x9c, 0x03, 0), + HSPHY_INIT_CFG(0xa0, 0x1d, 0), + HSPHY_INIT_CFG(0xa4, 0x03, 0), + HSPHY_INIT_CFG(0x8c, 0x23, 0), + HSPHY_INIT_CFG(0x78, 0x08, 0), + HSPHY_INIT_CFG(0x7c, 0xdc, 0), + HSPHY_INIT_CFG(0x90, 0xe0, 20), + HSPHY_INIT_CFG(0x74, 0x10, 0), + HSPHY_INIT_CFG(0x90, 0x60, 0), +}; + +static const struct hsphy_data hsphy_data_femtophy = { + .init_seq = init_seq_femtophy, + .init_seq_num = ARRAY_SIZE(init_seq_femtophy), +}; + +static const struct of_device_id qcom_snps_hsphy_match[] = { + { .compatible = "qcom,usb-hs-28nm-femtophy", .data = &hsphy_data_femtophy, }, + { }, +}; +MODULE_DEVICE_TABLE(of, qcom_snps_hsphy_match); + +static struct platform_driver qcom_snps_hsphy_driver = { + .probe = qcom_snps_hsphy_probe, + .driver = { + .name = "qcom,usb-hs-28nm-phy", + .of_match_table = qcom_snps_hsphy_match, + }, +}; +module_platform_driver(qcom_snps_hsphy_driver); + +MODULE_DESCRIPTION("Qualcomm 28nm Hi-Speed USB PHY driver"); +MODULE_LICENSE("GPL v2"); |