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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/phy/phy-lgm-usb.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/phy/phy-lgm-usb.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/drivers/phy/phy-lgm-usb.c b/drivers/phy/phy-lgm-usb.c new file mode 100644 index 000000000..309c8f0e0 --- /dev/null +++ b/drivers/phy/phy-lgm-usb.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel LGM USB PHY driver + * + * Copyright (C) 2020 Intel Corporation. + */ + +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/reset.h> +#include <linux/usb/phy.h> +#include <linux/workqueue.h> + +#define CTRL1_OFFSET 0x14 +#define SRAM_EXT_LD_DONE BIT(25) +#define SRAM_INIT_DONE BIT(26) + +#define TCPC_OFFSET 0x1014 +#define TCPC_MUX_CTL GENMASK(1, 0) +#define MUX_NC 0 +#define MUX_USB 1 +#define MUX_DP 2 +#define MUX_USBDP 3 +#define TCPC_FLIPPED BIT(2) +#define TCPC_LOW_POWER_EN BIT(3) +#define TCPC_VALID BIT(4) +#define TCPC_CONN \ + (TCPC_VALID | FIELD_PREP(TCPC_MUX_CTL, MUX_USB)) +#define TCPC_DISCONN \ + (TCPC_VALID | FIELD_PREP(TCPC_MUX_CTL, MUX_NC) | TCPC_LOW_POWER_EN) + +static const char *const PHY_RESETS[] = { "phy31", "phy", }; +static const char *const CTL_RESETS[] = { "apb", "ctrl", }; + +struct tca_apb { + struct reset_control *resets[ARRAY_SIZE(PHY_RESETS)]; + struct regulator *vbus; + struct work_struct wk; + struct usb_phy phy; + + bool regulator_enabled; + bool phy_initialized; + bool connected; +}; + +static int get_flipped(struct tca_apb *ta, bool *flipped) +{ + union extcon_property_value property; + int ret; + + ret = extcon_get_property(ta->phy.edev, EXTCON_USB_HOST, + EXTCON_PROP_USB_TYPEC_POLARITY, &property); + if (ret) { + dev_err(ta->phy.dev, "no polarity property from extcon\n"); + return ret; + } + + *flipped = property.intval; + + return 0; +} + +static int phy_init(struct usb_phy *phy) +{ + struct tca_apb *ta = container_of(phy, struct tca_apb, phy); + void __iomem *ctrl1 = phy->io_priv + CTRL1_OFFSET; + int val, ret, i; + + if (ta->phy_initialized) + return 0; + + for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++) + reset_control_deassert(ta->resets[i]); + + ret = readl_poll_timeout(ctrl1, val, val & SRAM_INIT_DONE, 10, 10 * 1000); + if (ret) { + dev_err(ta->phy.dev, "SRAM init failed, 0x%x\n", val); + return ret; + } + + writel(readl(ctrl1) | SRAM_EXT_LD_DONE, ctrl1); + + ta->phy_initialized = true; + if (!ta->phy.edev) { + writel(TCPC_CONN, ta->phy.io_priv + TCPC_OFFSET); + return phy->set_vbus(phy, true); + } + + schedule_work(&ta->wk); + + return ret; +} + +static void phy_shutdown(struct usb_phy *phy) +{ + struct tca_apb *ta = container_of(phy, struct tca_apb, phy); + int i; + + if (!ta->phy_initialized) + return; + + ta->phy_initialized = false; + flush_work(&ta->wk); + ta->phy.set_vbus(&ta->phy, false); + + ta->connected = false; + writel(TCPC_DISCONN, ta->phy.io_priv + TCPC_OFFSET); + + for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++) + reset_control_assert(ta->resets[i]); +} + +static int phy_set_vbus(struct usb_phy *phy, int on) +{ + struct tca_apb *ta = container_of(phy, struct tca_apb, phy); + int ret; + + if (!!on == ta->regulator_enabled) + return 0; + + if (on) + ret = regulator_enable(ta->vbus); + else + ret = regulator_disable(ta->vbus); + + if (!ret) + ta->regulator_enabled = on; + + dev_dbg(ta->phy.dev, "set vbus: %d\n", on); + return ret; +} + +static void tca_work(struct work_struct *work) +{ + struct tca_apb *ta = container_of(work, struct tca_apb, wk); + bool connected; + bool flipped = false; + u32 val; + int ret; + + ret = get_flipped(ta, &flipped); + if (ret) + return; + + connected = extcon_get_state(ta->phy.edev, EXTCON_USB_HOST); + if (connected == ta->connected) + return; + + ta->connected = connected; + if (connected) { + val = TCPC_CONN; + if (flipped) + val |= TCPC_FLIPPED; + dev_dbg(ta->phy.dev, "connected%s\n", flipped ? " flipped" : ""); + } else { + val = TCPC_DISCONN; + dev_dbg(ta->phy.dev, "disconnected\n"); + } + + writel(val, ta->phy.io_priv + TCPC_OFFSET); + + ret = ta->phy.set_vbus(&ta->phy, connected); + if (ret) + dev_err(ta->phy.dev, "failed to set VBUS\n"); +} + +static int id_notifier(struct notifier_block *nb, unsigned long event, void *ptr) +{ + struct tca_apb *ta = container_of(nb, struct tca_apb, phy.id_nb); + + if (ta->phy_initialized) + schedule_work(&ta->wk); + + return NOTIFY_DONE; +} + +static int vbus_notifier(struct notifier_block *nb, unsigned long evnt, void *ptr) +{ + return NOTIFY_DONE; +} + +static int phy_probe(struct platform_device *pdev) +{ + struct reset_control *resets[ARRAY_SIZE(CTL_RESETS)]; + struct device *dev = &pdev->dev; + struct usb_phy *phy; + struct tca_apb *ta; + int i; + + ta = devm_kzalloc(dev, sizeof(*ta), GFP_KERNEL); + if (!ta) + return -ENOMEM; + + platform_set_drvdata(pdev, ta); + INIT_WORK(&ta->wk, tca_work); + + phy = &ta->phy; + phy->dev = dev; + phy->label = dev_name(dev); + phy->type = USB_PHY_TYPE_USB3; + phy->init = phy_init; + phy->shutdown = phy_shutdown; + phy->set_vbus = phy_set_vbus; + phy->id_nb.notifier_call = id_notifier; + phy->vbus_nb.notifier_call = vbus_notifier; + + phy->io_priv = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(phy->io_priv)) + return PTR_ERR(phy->io_priv); + + ta->vbus = devm_regulator_get(dev, "vbus"); + if (IS_ERR(ta->vbus)) + return PTR_ERR(ta->vbus); + + for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++) { + resets[i] = devm_reset_control_get_exclusive(dev, CTL_RESETS[i]); + if (IS_ERR(resets[i])) { + dev_err(dev, "%s reset not found\n", CTL_RESETS[i]); + return PTR_ERR(resets[i]); + } + } + + for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++) { + ta->resets[i] = devm_reset_control_get_exclusive(dev, PHY_RESETS[i]); + if (IS_ERR(ta->resets[i])) { + dev_err(dev, "%s reset not found\n", PHY_RESETS[i]); + return PTR_ERR(ta->resets[i]); + } + } + + for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++) + reset_control_assert(resets[i]); + + for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++) + reset_control_assert(ta->resets[i]); + /* + * Out-of-band reset of the controller after PHY reset will cause + * controller malfunctioning, so we should use in-band controller + * reset only and leave the controller de-asserted here. + */ + for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++) + reset_control_deassert(resets[i]); + + /* Need to wait at least 20us after de-assert the controller */ + usleep_range(20, 100); + + return usb_add_phy_dev(phy); +} + +static int phy_remove(struct platform_device *pdev) +{ + struct tca_apb *ta = platform_get_drvdata(pdev); + + usb_remove_phy(&ta->phy); + + return 0; +} + +static const struct of_device_id intel_usb_phy_dt_ids[] = { + { .compatible = "intel,lgm-usb-phy" }, + { } +}; +MODULE_DEVICE_TABLE(of, intel_usb_phy_dt_ids); + +static struct platform_driver lgm_phy_driver = { + .driver = { + .name = "lgm-usb-phy", + .of_match_table = intel_usb_phy_dt_ids, + }, + .probe = phy_probe, + .remove = phy_remove, +}; + +module_platform_driver(lgm_phy_driver); + +MODULE_DESCRIPTION("Intel LGM USB PHY driver"); +MODULE_AUTHOR("Li Yin <yin1.li@intel.com>"); +MODULE_AUTHOR("Vadivel Murugan R <vadivel.muruganx.ramuthevar@linux.intel.com>"); +MODULE_LICENSE("GPL v2"); |