diff options
Diffstat (limited to 'drivers/phy/tegra/xusb.c')
| -rw-r--r-- | drivers/phy/tegra/xusb.c | 1404 |
1 files changed, 1404 insertions, 0 deletions
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c new file mode 100644 index 000000000..8f11b293c --- /dev/null +++ b/drivers/phy/tegra/xusb.c @@ -0,0 +1,1404 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved. + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/mailbox_client.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/phy/tegra/xusb.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/reset.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +#include <soc/tegra/fuse.h> + +#include "xusb.h" + +static struct phy *tegra_xusb_pad_of_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct tegra_xusb_pad *pad = dev_get_drvdata(dev); + struct phy *phy = NULL; + unsigned int i; + + if (args->args_count != 0) + return ERR_PTR(-EINVAL); + + for (i = 0; i < pad->soc->num_lanes; i++) { + if (!pad->lanes[i]) + continue; + + if (pad->lanes[i]->dev.of_node == args->np) { + phy = pad->lanes[i]; + break; + } + } + + if (phy == NULL) + phy = ERR_PTR(-ENODEV); + + return phy; +} + +static const struct of_device_id tegra_xusb_padctl_of_match[] = { +#if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC) + { + .compatible = "nvidia,tegra124-xusb-padctl", + .data = &tegra124_xusb_padctl_soc, + }, +#endif +#if defined(CONFIG_ARCH_TEGRA_210_SOC) + { + .compatible = "nvidia,tegra210-xusb-padctl", + .data = &tegra210_xusb_padctl_soc, + }, +#endif +#if defined(CONFIG_ARCH_TEGRA_186_SOC) + { + .compatible = "nvidia,tegra186-xusb-padctl", + .data = &tegra186_xusb_padctl_soc, + }, +#endif +#if defined(CONFIG_ARCH_TEGRA_194_SOC) + { + .compatible = "nvidia,tegra194-xusb-padctl", + .data = &tegra194_xusb_padctl_soc, + }, +#endif + { } +}; +MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match); + +static struct device_node * +tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name) +{ + struct device_node *pads, *np; + + pads = of_get_child_by_name(padctl->dev->of_node, "pads"); + if (!pads) + return NULL; + + np = of_get_child_by_name(pads, name); + of_node_put(pads); + + return np; +} + +static struct device_node * +tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index) +{ + struct device_node *np, *lanes; + + lanes = of_get_child_by_name(pad->dev.of_node, "lanes"); + if (!lanes) + return NULL; + + np = of_get_child_by_name(lanes, pad->soc->lanes[index].name); + of_node_put(lanes); + + return np; +} + +int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane, + struct device_node *np) +{ + struct device *dev = &lane->pad->dev; + const char *function; + int err; + + err = of_property_read_string(np, "nvidia,function", &function); + if (err < 0) + return err; + + err = match_string(lane->soc->funcs, lane->soc->num_funcs, function); + if (err < 0) { + dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n", + function, np); + return err; + } + + lane->function = err; + + return 0; +} + +static void tegra_xusb_lane_destroy(struct phy *phy) +{ + if (phy) { + struct tegra_xusb_lane *lane = phy_get_drvdata(phy); + + lane->pad->ops->remove(lane); + phy_destroy(phy); + } +} + +static void tegra_xusb_pad_release(struct device *dev) +{ + struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev); + + pad->soc->ops->remove(pad); +} + +static struct device_type tegra_xusb_pad_type = { + .release = tegra_xusb_pad_release, +}; + +int tegra_xusb_pad_init(struct tegra_xusb_pad *pad, + struct tegra_xusb_padctl *padctl, + struct device_node *np) +{ + int err; + + device_initialize(&pad->dev); + INIT_LIST_HEAD(&pad->list); + pad->dev.parent = padctl->dev; + pad->dev.type = &tegra_xusb_pad_type; + pad->dev.of_node = np; + pad->padctl = padctl; + + err = dev_set_name(&pad->dev, "%s", pad->soc->name); + if (err < 0) + goto unregister; + + err = device_add(&pad->dev); + if (err < 0) + goto unregister; + + return 0; + +unregister: + device_unregister(&pad->dev); + return err; +} + +int tegra_xusb_pad_register(struct tegra_xusb_pad *pad, + const struct phy_ops *ops) +{ + struct device_node *children; + struct phy *lane; + unsigned int i; + int err; + + children = of_get_child_by_name(pad->dev.of_node, "lanes"); + if (!children) + return -ENODEV; + + pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane), + GFP_KERNEL); + if (!pad->lanes) { + of_node_put(children); + return -ENOMEM; + } + + for (i = 0; i < pad->soc->num_lanes; i++) { + struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i); + struct tegra_xusb_lane *lane; + + /* skip disabled lanes */ + if (!np || !of_device_is_available(np)) { + of_node_put(np); + continue; + } + + pad->lanes[i] = phy_create(&pad->dev, np, ops); + if (IS_ERR(pad->lanes[i])) { + err = PTR_ERR(pad->lanes[i]); + of_node_put(np); + goto remove; + } + + lane = pad->ops->probe(pad, np, i); + if (IS_ERR(lane)) { + phy_destroy(pad->lanes[i]); + err = PTR_ERR(lane); + goto remove; + } + + list_add_tail(&lane->list, &pad->padctl->lanes); + phy_set_drvdata(pad->lanes[i], lane); + } + + pad->provider = of_phy_provider_register_full(&pad->dev, children, + tegra_xusb_pad_of_xlate); + if (IS_ERR(pad->provider)) { + err = PTR_ERR(pad->provider); + goto remove; + } + + return 0; + +remove: + while (i--) + tegra_xusb_lane_destroy(pad->lanes[i]); + + of_node_put(children); + + return err; +} + +void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad) +{ + unsigned int i = pad->soc->num_lanes; + + of_phy_provider_unregister(pad->provider); + + while (i--) + tegra_xusb_lane_destroy(pad->lanes[i]); + + device_unregister(&pad->dev); +} + +static struct tegra_xusb_pad * +tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl, + const struct tegra_xusb_pad_soc *soc) +{ + struct tegra_xusb_pad *pad; + struct device_node *np; + int err; + + np = tegra_xusb_find_pad_node(padctl, soc->name); + if (!np || !of_device_is_available(np)) + return NULL; + + pad = soc->ops->probe(padctl, soc, np); + if (IS_ERR(pad)) { + err = PTR_ERR(pad); + dev_err(padctl->dev, "failed to create pad %s: %d\n", + soc->name, err); + return ERR_PTR(err); + } + + /* XXX move this into ->probe() to avoid string comparison */ + if (strcmp(soc->name, "pcie") == 0) + padctl->pcie = pad; + + if (strcmp(soc->name, "sata") == 0) + padctl->sata = pad; + + if (strcmp(soc->name, "usb2") == 0) + padctl->usb2 = pad; + + if (strcmp(soc->name, "ulpi") == 0) + padctl->ulpi = pad; + + if (strcmp(soc->name, "hsic") == 0) + padctl->hsic = pad; + + return pad; +} + +static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) +{ + struct tegra_xusb_pad *pad, *tmp; + + list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) { + list_del(&pad->list); + tegra_xusb_pad_unregister(pad); + } +} + +static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl) +{ + mutex_lock(&padctl->lock); + __tegra_xusb_remove_pads(padctl); + mutex_unlock(&padctl->lock); +} + +static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane) +{ + struct tegra_xusb_padctl *padctl = lane->pad->padctl; + const struct tegra_xusb_lane_soc *soc = lane->soc; + u32 value; + + /* skip single function lanes */ + if (soc->num_funcs < 2) + return; + + /* choose function */ + value = padctl_readl(padctl, soc->offset); + value &= ~(soc->mask << soc->shift); + value |= lane->function << soc->shift; + padctl_writel(padctl, value, soc->offset); +} + +static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad) +{ + unsigned int i; + + for (i = 0; i < pad->soc->num_lanes; i++) { + struct tegra_xusb_lane *lane; + + if (pad->lanes[i]) { + lane = phy_get_drvdata(pad->lanes[i]); + tegra_xusb_lane_program(lane); + } + } +} + +static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl) +{ + struct tegra_xusb_pad *pad; + unsigned int i; + + mutex_lock(&padctl->lock); + + for (i = 0; i < padctl->soc->num_pads; i++) { + const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i]; + int err; + + pad = tegra_xusb_pad_create(padctl, soc); + if (IS_ERR(pad)) { + err = PTR_ERR(pad); + dev_err(padctl->dev, "failed to create pad %s: %d\n", + soc->name, err); + __tegra_xusb_remove_pads(padctl); + mutex_unlock(&padctl->lock); + return err; + } + + if (!pad) + continue; + + list_add_tail(&pad->list, &padctl->pads); + } + + list_for_each_entry(pad, &padctl->pads, list) + tegra_xusb_pad_program(pad); + + mutex_unlock(&padctl->lock); + return 0; +} + +static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane, + const char *function) +{ + const char *func = lane->soc->funcs[lane->function]; + + return strcmp(function, func) == 0; +} + +struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl, + const char *type, + unsigned int index) +{ + struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV); + char *name; + + name = kasprintf(GFP_KERNEL, "%s-%u", type, index); + if (!name) + return ERR_PTR(-ENOMEM); + + list_for_each_entry(lane, &padctl->lanes, list) { + if (strcmp(lane->soc->name, name) == 0) { + hit = lane; + break; + } + } + + kfree(name); + return hit; +} + +struct tegra_xusb_lane * +tegra_xusb_port_find_lane(struct tegra_xusb_port *port, + const struct tegra_xusb_lane_map *map, + const char *function) +{ + struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV); + + for (; map->type; map++) { + if (port->index != map->port) + continue; + + lane = tegra_xusb_find_lane(port->padctl, map->type, + map->index); + if (IS_ERR(lane)) + continue; + + if (!tegra_xusb_lane_check(lane, function)) + continue; + + if (!IS_ERR(match)) + dev_err(&port->dev, "conflicting match: %s-%u / %s\n", + map->type, map->index, match->soc->name); + else + match = lane; + } + + return match; +} + +static struct device_node * +tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type, + unsigned int index) +{ + struct device_node *ports, *np; + char *name; + + ports = of_get_child_by_name(padctl->dev->of_node, "ports"); + if (!ports) + return NULL; + + name = kasprintf(GFP_KERNEL, "%s-%u", type, index); + if (!name) { + of_node_put(ports); + return ERR_PTR(-ENOMEM); + } + np = of_get_child_by_name(ports, name); + kfree(name); + of_node_put(ports); + + return np; +} + +struct tegra_xusb_port * +tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type, + unsigned int index) +{ + struct tegra_xusb_port *port; + struct device_node *np; + + np = tegra_xusb_find_port_node(padctl, type, index); + if (!np) + return NULL; + + list_for_each_entry(port, &padctl->ports, list) { + if (np == port->dev.of_node) { + of_node_put(np); + return port; + } + } + + of_node_put(np); + + return NULL; +} + +struct tegra_xusb_usb2_port * +tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index) +{ + struct tegra_xusb_port *port; + + port = tegra_xusb_find_port(padctl, "usb2", index); + if (port) + return to_usb2_port(port); + + return NULL; +} + +struct tegra_xusb_usb3_port * +tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index) +{ + struct tegra_xusb_port *port; + + port = tegra_xusb_find_port(padctl, "usb3", index); + if (port) + return to_usb3_port(port); + + return NULL; +} + +static void tegra_xusb_port_release(struct device *dev) +{ + struct tegra_xusb_port *port = to_tegra_xusb_port(dev); + + if (port->ops->release) + port->ops->release(port); +} + +static struct device_type tegra_xusb_port_type = { + .release = tegra_xusb_port_release, +}; + +static int tegra_xusb_port_init(struct tegra_xusb_port *port, + struct tegra_xusb_padctl *padctl, + struct device_node *np, + const char *name, + unsigned int index) +{ + int err; + + INIT_LIST_HEAD(&port->list); + port->padctl = padctl; + port->index = index; + + device_initialize(&port->dev); + port->dev.type = &tegra_xusb_port_type; + port->dev.of_node = of_node_get(np); + port->dev.parent = padctl->dev; + + err = dev_set_name(&port->dev, "%s-%u", name, index); + if (err < 0) + goto unregister; + + err = device_add(&port->dev); + if (err < 0) + goto unregister; + + return 0; + +unregister: + device_unregister(&port->dev); + return err; +} + +static void tegra_xusb_port_unregister(struct tegra_xusb_port *port) +{ + if (!IS_ERR_OR_NULL(port->usb_role_sw)) { + of_platform_depopulate(&port->dev); + usb_role_switch_unregister(port->usb_role_sw); + cancel_work_sync(&port->usb_phy_work); + usb_remove_phy(&port->usb_phy); + port->usb_phy.dev->driver = NULL; + } + + if (port->ops->remove) + port->ops->remove(port); + + device_unregister(&port->dev); +} + +static const char *const modes[] = { + [USB_DR_MODE_UNKNOWN] = "", + [USB_DR_MODE_HOST] = "host", + [USB_DR_MODE_PERIPHERAL] = "peripheral", + [USB_DR_MODE_OTG] = "otg", +}; + +static const char * const usb_roles[] = { + [USB_ROLE_NONE] = "none", + [USB_ROLE_HOST] = "host", + [USB_ROLE_DEVICE] = "device", +}; + +static enum usb_phy_events to_usb_phy_event(enum usb_role role) +{ + switch (role) { + case USB_ROLE_DEVICE: + return USB_EVENT_VBUS; + + case USB_ROLE_HOST: + return USB_EVENT_ID; + + default: + return USB_EVENT_NONE; + } +} + +static void tegra_xusb_usb_phy_work(struct work_struct *work) +{ + struct tegra_xusb_port *port = container_of(work, + struct tegra_xusb_port, + usb_phy_work); + enum usb_role role = usb_role_switch_get_role(port->usb_role_sw); + + usb_phy_set_event(&port->usb_phy, to_usb_phy_event(role)); + + dev_dbg(&port->dev, "%s(): calling notifier for role %s\n", __func__, + usb_roles[role]); + + atomic_notifier_call_chain(&port->usb_phy.notifier, 0, &port->usb_phy); +} + +static int tegra_xusb_role_sw_set(struct usb_role_switch *sw, + enum usb_role role) +{ + struct tegra_xusb_port *port = usb_role_switch_get_drvdata(sw); + + dev_dbg(&port->dev, "%s(): role %s\n", __func__, usb_roles[role]); + + schedule_work(&port->usb_phy_work); + + return 0; +} + +static int tegra_xusb_set_peripheral(struct usb_otg *otg, + struct usb_gadget *gadget) +{ + struct tegra_xusb_port *port = container_of(otg->usb_phy, + struct tegra_xusb_port, + usb_phy); + + if (gadget != NULL) + schedule_work(&port->usb_phy_work); + + return 0; +} + +static int tegra_xusb_set_host(struct usb_otg *otg, struct usb_bus *host) +{ + struct tegra_xusb_port *port = container_of(otg->usb_phy, + struct tegra_xusb_port, + usb_phy); + + if (host != NULL) + schedule_work(&port->usb_phy_work); + + return 0; +} + + +static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port) +{ + struct tegra_xusb_lane *lane; + struct usb_role_switch_desc role_sx_desc = { + .fwnode = dev_fwnode(&port->dev), + .set = tegra_xusb_role_sw_set, + }; + int err = 0; + + /* + * USB role switch driver needs parent driver owner info. This is a + * suboptimal solution. TODO: Need to revisit this in a follow-up patch + * where an optimal solution is possible with changes to USB role + * switch driver. + */ + port->dev.driver = devm_kzalloc(&port->dev, + sizeof(struct device_driver), + GFP_KERNEL); + if (!port->dev.driver) + return -ENOMEM; + + port->dev.driver->owner = THIS_MODULE; + + port->usb_role_sw = usb_role_switch_register(&port->dev, + &role_sx_desc); + if (IS_ERR(port->usb_role_sw)) { + err = PTR_ERR(port->usb_role_sw); + dev_err(&port->dev, "failed to register USB role switch: %d", + err); + return err; + } + + INIT_WORK(&port->usb_phy_work, tegra_xusb_usb_phy_work); + usb_role_switch_set_drvdata(port->usb_role_sw, port); + + port->usb_phy.otg = devm_kzalloc(&port->dev, sizeof(struct usb_otg), + GFP_KERNEL); + if (!port->usb_phy.otg) + return -ENOMEM; + + lane = tegra_xusb_find_lane(port->padctl, "usb2", port->index); + + /* + * Assign phy dev to usb-phy dev. Host/device drivers can use phy + * reference to retrieve usb-phy details. + */ + port->usb_phy.dev = &lane->pad->lanes[port->index]->dev; + port->usb_phy.dev->driver = port->dev.driver; + port->usb_phy.otg->usb_phy = &port->usb_phy; + port->usb_phy.otg->set_peripheral = tegra_xusb_set_peripheral; + port->usb_phy.otg->set_host = tegra_xusb_set_host; + + err = usb_add_phy_dev(&port->usb_phy); + if (err < 0) { + dev_err(&port->dev, "Failed to add USB PHY: %d\n", err); + return err; + } + + /* populate connector entry */ + of_platform_populate(port->dev.of_node, NULL, NULL, &port->dev); + + return err; +} + +static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2) +{ + struct tegra_xusb_port *port = &usb2->base; + struct device_node *np = port->dev.of_node; + const char *mode; + int err; + + usb2->internal = of_property_read_bool(np, "nvidia,internal"); + + if (!of_property_read_string(np, "mode", &mode)) { + int err = match_string(modes, ARRAY_SIZE(modes), mode); + if (err < 0) { + dev_err(&port->dev, "invalid value %s for \"mode\"\n", + mode); + usb2->mode = USB_DR_MODE_UNKNOWN; + } else { + usb2->mode = err; + } + } else { + usb2->mode = USB_DR_MODE_HOST; + } + + /* usb-role-switch property is mandatory for OTG/Peripheral modes */ + if (usb2->mode == USB_DR_MODE_PERIPHERAL || + usb2->mode == USB_DR_MODE_OTG) { + if (of_property_read_bool(np, "usb-role-switch")) { + err = tegra_xusb_setup_usb_role_switch(port); + if (err < 0) + return err; + } else { + dev_err(&port->dev, "usb-role-switch not found for %s mode", + modes[usb2->mode]); + return -EINVAL; + } + } + + usb2->supply = regulator_get(&port->dev, "vbus"); + return PTR_ERR_OR_ZERO(usb2->supply); +} + +static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl, + unsigned int index) +{ + struct tegra_xusb_usb2_port *usb2; + struct device_node *np; + int err = 0; + + /* + * USB2 ports don't require additional properties, but if the port is + * marked as disabled there is no reason to register it. + */ + np = tegra_xusb_find_port_node(padctl, "usb2", index); + if (!np || !of_device_is_available(np)) + goto out; + + usb2 = kzalloc(sizeof(*usb2), GFP_KERNEL); + if (!usb2) { + err = -ENOMEM; + goto out; + } + + err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index); + if (err < 0) + goto out; + + usb2->base.ops = padctl->soc->ports.usb2.ops; + + usb2->base.lane = usb2->base.ops->map(&usb2->base); + if (IS_ERR(usb2->base.lane)) { + err = PTR_ERR(usb2->base.lane); + tegra_xusb_port_unregister(&usb2->base); + goto out; + } + + err = tegra_xusb_usb2_port_parse_dt(usb2); + if (err < 0) { + tegra_xusb_port_unregister(&usb2->base); + goto out; + } + + list_add_tail(&usb2->base.list, &padctl->ports); + +out: + of_node_put(np); + return err; +} + +void tegra_xusb_usb2_port_release(struct tegra_xusb_port *port) +{ + struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port); + + kfree(usb2); +} + +void tegra_xusb_usb2_port_remove(struct tegra_xusb_port *port) +{ + struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port); + + regulator_put(usb2->supply); +} + +static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi) +{ + struct tegra_xusb_port *port = &ulpi->base; + struct device_node *np = port->dev.of_node; + + ulpi->internal = of_property_read_bool(np, "nvidia,internal"); + + return 0; +} + +static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl, + unsigned int index) +{ + struct tegra_xusb_ulpi_port *ulpi; + struct device_node *np; + int err = 0; + + np = tegra_xusb_find_port_node(padctl, "ulpi", index); + if (!np || !of_device_is_available(np)) + goto out; + + ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL); + if (!ulpi) { + err = -ENOMEM; + goto out; + } + + err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index); + if (err < 0) + goto out; + + ulpi->base.ops = padctl->soc->ports.ulpi.ops; + + ulpi->base.lane = ulpi->base.ops->map(&ulpi->base); + if (IS_ERR(ulpi->base.lane)) { + err = PTR_ERR(ulpi->base.lane); + tegra_xusb_port_unregister(&ulpi->base); + goto out; + } + + err = tegra_xusb_ulpi_port_parse_dt(ulpi); + if (err < 0) { + tegra_xusb_port_unregister(&ulpi->base); + goto out; + } + + list_add_tail(&ulpi->base.list, &padctl->ports); + +out: + of_node_put(np); + return err; +} + +void tegra_xusb_ulpi_port_release(struct tegra_xusb_port *port) +{ + struct tegra_xusb_ulpi_port *ulpi = to_ulpi_port(port); + + kfree(ulpi); +} + +static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic) +{ + /* XXX */ + return 0; +} + +static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl, + unsigned int index) +{ + struct tegra_xusb_hsic_port *hsic; + struct device_node *np; + int err = 0; + + np = tegra_xusb_find_port_node(padctl, "hsic", index); + if (!np || !of_device_is_available(np)) + goto out; + + hsic = kzalloc(sizeof(*hsic), GFP_KERNEL); + if (!hsic) { + err = -ENOMEM; + goto out; + } + + err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index); + if (err < 0) + goto out; + + hsic->base.ops = padctl->soc->ports.hsic.ops; + + hsic->base.lane = hsic->base.ops->map(&hsic->base); + if (IS_ERR(hsic->base.lane)) { + err = PTR_ERR(hsic->base.lane); + goto out; + } + + err = tegra_xusb_hsic_port_parse_dt(hsic); + if (err < 0) { + tegra_xusb_port_unregister(&hsic->base); + goto out; + } + + list_add_tail(&hsic->base.list, &padctl->ports); + +out: + of_node_put(np); + return err; +} + +void tegra_xusb_hsic_port_release(struct tegra_xusb_port *port) +{ + struct tegra_xusb_hsic_port *hsic = to_hsic_port(port); + + kfree(hsic); +} + +static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3) +{ + struct tegra_xusb_port *port = &usb3->base; + struct device_node *np = port->dev.of_node; + enum usb_device_speed maximum_speed; + u32 value; + int err; + + err = of_property_read_u32(np, "nvidia,usb2-companion", &value); + if (err < 0) { + dev_err(&port->dev, "failed to read port: %d\n", err); + return err; + } + + usb3->port = value; + + usb3->internal = of_property_read_bool(np, "nvidia,internal"); + + if (device_property_present(&port->dev, "maximum-speed")) { + maximum_speed = usb_get_maximum_speed(&port->dev); + if (maximum_speed == USB_SPEED_SUPER) + usb3->disable_gen2 = true; + else if (maximum_speed == USB_SPEED_SUPER_PLUS) + usb3->disable_gen2 = false; + else + return -EINVAL; + } + + usb3->supply = regulator_get(&port->dev, "vbus"); + return PTR_ERR_OR_ZERO(usb3->supply); +} + +static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl, + unsigned int index) +{ + struct tegra_xusb_usb3_port *usb3; + struct device_node *np; + int err = 0; + + /* + * If there is no supplemental configuration in the device tree the + * port is unusable. But it is valid to configure only a single port, + * hence return 0 instead of an error to allow ports to be optional. + */ + np = tegra_xusb_find_port_node(padctl, "usb3", index); + if (!np || !of_device_is_available(np)) + goto out; + + usb3 = kzalloc(sizeof(*usb3), GFP_KERNEL); + if (!usb3) { + err = -ENOMEM; + goto out; + } + + err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index); + if (err < 0) + goto out; + + usb3->base.ops = padctl->soc->ports.usb3.ops; + + usb3->base.lane = usb3->base.ops->map(&usb3->base); + if (IS_ERR(usb3->base.lane)) { + err = PTR_ERR(usb3->base.lane); + goto out; + } + + err = tegra_xusb_usb3_port_parse_dt(usb3); + if (err < 0) { + tegra_xusb_port_unregister(&usb3->base); + goto out; + } + + list_add_tail(&usb3->base.list, &padctl->ports); + +out: + of_node_put(np); + return err; +} + +void tegra_xusb_usb3_port_release(struct tegra_xusb_port *port) +{ + struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port); + + kfree(usb3); +} + +void tegra_xusb_usb3_port_remove(struct tegra_xusb_port *port) +{ + struct tegra_xusb_usb3_port *usb3 = to_usb3_port(port); + + regulator_put(usb3->supply); +} + +static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) +{ + struct tegra_xusb_port *port, *tmp; + + list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) { + list_del(&port->list); + tegra_xusb_port_unregister(port); + } +} + +static int tegra_xusb_find_unused_usb3_port(struct tegra_xusb_padctl *padctl) +{ + struct device_node *np; + unsigned int i; + + for (i = 0; i < padctl->soc->ports.usb3.count; i++) { + np = tegra_xusb_find_port_node(padctl, "usb3", i); + if (!np || !of_device_is_available(np)) + return i; + } + + return -ENODEV; +} + +static bool tegra_xusb_port_is_companion(struct tegra_xusb_usb2_port *usb2) +{ + unsigned int i; + struct tegra_xusb_usb3_port *usb3; + struct tegra_xusb_padctl *padctl = usb2->base.padctl; + + for (i = 0; i < padctl->soc->ports.usb3.count; i++) { + usb3 = tegra_xusb_find_usb3_port(padctl, i); + if (usb3 && usb3->port == usb2->base.index) + return true; + } + + return false; +} + +static int tegra_xusb_update_usb3_fake_port(struct tegra_xusb_usb2_port *usb2) +{ + int fake; + + /* Disable usb3_port_fake usage by default and assign if needed */ + usb2->usb3_port_fake = -1; + + if ((usb2->mode == USB_DR_MODE_OTG || + usb2->mode == USB_DR_MODE_PERIPHERAL) && + !tegra_xusb_port_is_companion(usb2)) { + fake = tegra_xusb_find_unused_usb3_port(usb2->base.padctl); + if (fake < 0) { + dev_err(&usb2->base.dev, "no unused USB3 ports available\n"); + return -ENODEV; + } + + dev_dbg(&usb2->base.dev, "Found unused usb3 port: %d\n", fake); + usb2->usb3_port_fake = fake; + } + + return 0; +} + +static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl) +{ + struct tegra_xusb_port *port; + struct tegra_xusb_usb2_port *usb2; + unsigned int i; + int err = 0; + + mutex_lock(&padctl->lock); + + for (i = 0; i < padctl->soc->ports.usb2.count; i++) { + err = tegra_xusb_add_usb2_port(padctl, i); + if (err < 0) + goto remove_ports; + } + + for (i = 0; i < padctl->soc->ports.ulpi.count; i++) { + err = tegra_xusb_add_ulpi_port(padctl, i); + if (err < 0) + goto remove_ports; + } + + for (i = 0; i < padctl->soc->ports.hsic.count; i++) { + err = tegra_xusb_add_hsic_port(padctl, i); + if (err < 0) + goto remove_ports; + } + + for (i = 0; i < padctl->soc->ports.usb3.count; i++) { + err = tegra_xusb_add_usb3_port(padctl, i); + if (err < 0) + goto remove_ports; + } + + if (padctl->soc->need_fake_usb3_port) { + for (i = 0; i < padctl->soc->ports.usb2.count; i++) { + usb2 = tegra_xusb_find_usb2_port(padctl, i); + if (!usb2) + continue; + + err = tegra_xusb_update_usb3_fake_port(usb2); + if (err < 0) + goto remove_ports; + } + } + + list_for_each_entry(port, &padctl->ports, list) { + err = port->ops->enable(port); + if (err < 0) + dev_err(padctl->dev, "failed to enable port %s: %d\n", + dev_name(&port->dev), err); + } + + goto unlock; + +remove_ports: + __tegra_xusb_remove_ports(padctl); +unlock: + mutex_unlock(&padctl->lock); + return err; +} + +static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl) +{ + mutex_lock(&padctl->lock); + __tegra_xusb_remove_ports(padctl); + mutex_unlock(&padctl->lock); +} + +static int tegra_xusb_padctl_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct tegra_xusb_padctl_soc *soc; + struct tegra_xusb_padctl *padctl; + const struct of_device_id *match; + struct resource *res; + int err; + + /* for backwards compatibility with old device trees */ + np = of_get_child_by_name(np, "pads"); + if (!np) { + dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n"); + return tegra_xusb_padctl_legacy_probe(pdev); + } + + of_node_put(np); + + match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node); + soc = match->data; + + padctl = soc->ops->probe(&pdev->dev, soc); + if (IS_ERR(padctl)) + return PTR_ERR(padctl); + + platform_set_drvdata(pdev, padctl); + INIT_LIST_HEAD(&padctl->ports); + INIT_LIST_HEAD(&padctl->lanes); + INIT_LIST_HEAD(&padctl->pads); + mutex_init(&padctl->lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + padctl->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(padctl->regs)) { + err = PTR_ERR(padctl->regs); + goto remove; + } + + padctl->rst = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(padctl->rst)) { + err = PTR_ERR(padctl->rst); + goto remove; + } + + padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies, + sizeof(*padctl->supplies), GFP_KERNEL); + if (!padctl->supplies) { + err = -ENOMEM; + goto remove; + } + + regulator_bulk_set_supply_names(padctl->supplies, + padctl->soc->supply_names, + padctl->soc->num_supplies); + + err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies, + padctl->supplies); + if (err < 0) { + dev_err(&pdev->dev, "failed to get regulators: %d\n", err); + goto remove; + } + + err = reset_control_deassert(padctl->rst); + if (err < 0) + goto remove; + + err = regulator_bulk_enable(padctl->soc->num_supplies, + padctl->supplies); + if (err < 0) { + dev_err(&pdev->dev, "failed to enable supplies: %d\n", err); + goto reset; + } + + err = tegra_xusb_setup_pads(padctl); + if (err < 0) { + dev_err(&pdev->dev, "failed to setup pads: %d\n", err); + goto power_down; + } + + err = tegra_xusb_setup_ports(padctl); + if (err) { + const char *level = KERN_ERR; + + if (err == -EPROBE_DEFER) + level = KERN_DEBUG; + + dev_printk(level, &pdev->dev, + dev_fmt("failed to setup XUSB ports: %d\n"), err); + goto remove_pads; + } + + return 0; + +remove_pads: + tegra_xusb_remove_pads(padctl); +power_down: + regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies); +reset: + reset_control_assert(padctl->rst); +remove: + platform_set_drvdata(pdev, NULL); + soc->ops->remove(padctl); + return err; +} + +static int tegra_xusb_padctl_remove(struct platform_device *pdev) +{ + struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev); + int err; + + tegra_xusb_remove_ports(padctl); + tegra_xusb_remove_pads(padctl); + + err = regulator_bulk_disable(padctl->soc->num_supplies, + padctl->supplies); + if (err < 0) + dev_err(&pdev->dev, "failed to disable supplies: %d\n", err); + + err = reset_control_assert(padctl->rst); + if (err < 0) + dev_err(&pdev->dev, "failed to assert reset: %d\n", err); + + padctl->soc->ops->remove(padctl); + + return err; +} + +static struct platform_driver tegra_xusb_padctl_driver = { + .driver = { + .name = "tegra-xusb-padctl", + .of_match_table = tegra_xusb_padctl_of_match, + }, + .probe = tegra_xusb_padctl_probe, + .remove = tegra_xusb_padctl_remove, +}; +module_platform_driver(tegra_xusb_padctl_driver); + +struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev) +{ + struct tegra_xusb_padctl *padctl; + struct platform_device *pdev; + struct device_node *np; + + np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0); + if (!np) + return ERR_PTR(-EINVAL); + + /* + * This is slightly ugly. A better implementation would be to keep a + * registry of pad controllers, but since there will almost certainly + * only ever be one per SoC that would be a little overkill. + */ + pdev = of_find_device_by_node(np); + if (!pdev) { + of_node_put(np); + return ERR_PTR(-ENODEV); + } + + of_node_put(np); + + padctl = platform_get_drvdata(pdev); + if (!padctl) { + put_device(&pdev->dev); + return ERR_PTR(-EPROBE_DEFER); + } + + return padctl; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get); + +void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl) +{ + if (padctl) + put_device(padctl->dev); +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put); + +int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl, + unsigned int port) +{ + if (padctl->soc->ops->usb3_save_context) + return padctl->soc->ops->usb3_save_context(padctl, port); + + return -ENOSYS; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context); + +int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl, + unsigned int port, bool idle) +{ + if (padctl->soc->ops->hsic_set_idle) + return padctl->soc->ops->hsic_set_idle(padctl, port, idle); + + return -ENOSYS; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle); + +int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl, + unsigned int port, bool enable) +{ + if (padctl->soc->ops->usb3_set_lfps_detect) + return padctl->soc->ops->usb3_set_lfps_detect(padctl, port, + enable); + + return -ENOSYS; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect); + +int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl, + bool val) +{ + if (padctl->soc->ops->vbus_override) + return padctl->soc->ops->vbus_override(padctl, val); + + return -ENOTSUPP; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override); + +int tegra_phy_xusb_utmi_port_reset(struct phy *phy) +{ + struct tegra_xusb_lane *lane = phy_get_drvdata(phy); + struct tegra_xusb_padctl *padctl = lane->pad->padctl; + + if (padctl->soc->ops->utmi_port_reset) + return padctl->soc->ops->utmi_port_reset(phy); + + return -ENOTSUPP; +} +EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset); + +int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl, + unsigned int port) +{ + struct tegra_xusb_usb2_port *usb2; + struct tegra_xusb_usb3_port *usb3; + int i; + + usb2 = tegra_xusb_find_usb2_port(padctl, port); + if (!usb2) + return -EINVAL; + + for (i = 0; i < padctl->soc->ports.usb3.count; i++) { + usb3 = tegra_xusb_find_usb3_port(padctl, i); + if (usb3 && usb3->port == usb2->base.index) + return usb3->base.index; + } + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get_usb3_companion); + +MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); +MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver"); +MODULE_LICENSE("GPL v2"); |