diff options
Diffstat (limited to 'drivers/greybus/interface.c')
| -rw-r--r-- | drivers/greybus/interface.c | 1263 |
1 files changed, 1263 insertions, 0 deletions
diff --git a/drivers/greybus/interface.c b/drivers/greybus/interface.c new file mode 100644 index 000000000..9ec949a43 --- /dev/null +++ b/drivers/greybus/interface.c @@ -0,0 +1,1263 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Greybus interface code + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + */ + +#include <linux/delay.h> +#include <linux/greybus.h> + +#include "greybus_trace.h" + +#define GB_INTERFACE_MODE_SWITCH_TIMEOUT 2000 + +#define GB_INTERFACE_DEVICE_ID_BAD 0xff + +#define GB_INTERFACE_AUTOSUSPEND_MS 3000 + +/* Time required for interface to enter standby before disabling REFCLK */ +#define GB_INTERFACE_SUSPEND_HIBERNATE_DELAY_MS 20 + +/* Don't-care selector index */ +#define DME_SELECTOR_INDEX_NULL 0 + +/* DME attributes */ +/* FIXME: remove ES2 support and DME_T_TST_SRC_INCREMENT */ +#define DME_T_TST_SRC_INCREMENT 0x4083 + +#define DME_DDBL1_MANUFACTURERID 0x5003 +#define DME_DDBL1_PRODUCTID 0x5004 + +#define DME_TOSHIBA_GMP_VID 0x6000 +#define DME_TOSHIBA_GMP_PID 0x6001 +#define DME_TOSHIBA_GMP_SN0 0x6002 +#define DME_TOSHIBA_GMP_SN1 0x6003 +#define DME_TOSHIBA_GMP_INIT_STATUS 0x6101 + +/* DDBL1 Manufacturer and Product ids */ +#define TOSHIBA_DMID 0x0126 +#define TOSHIBA_ES2_BRIDGE_DPID 0x1000 +#define TOSHIBA_ES3_APBRIDGE_DPID 0x1001 +#define TOSHIBA_ES3_GBPHY_DPID 0x1002 + +static int gb_interface_hibernate_link(struct gb_interface *intf); +static int gb_interface_refclk_set(struct gb_interface *intf, bool enable); + +static int gb_interface_dme_attr_get(struct gb_interface *intf, + u16 attr, u32 *val) +{ + return gb_svc_dme_peer_get(intf->hd->svc, intf->interface_id, + attr, DME_SELECTOR_INDEX_NULL, val); +} + +static int gb_interface_read_ara_dme(struct gb_interface *intf) +{ + u32 sn0, sn1; + int ret; + + /* + * Unless this is a Toshiba bridge, bail out until we have defined + * standard GMP attributes. + */ + if (intf->ddbl1_manufacturer_id != TOSHIBA_DMID) { + dev_err(&intf->dev, "unknown manufacturer %08x\n", + intf->ddbl1_manufacturer_id); + return -ENODEV; + } + + ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_VID, + &intf->vendor_id); + if (ret) + return ret; + + ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_PID, + &intf->product_id); + if (ret) + return ret; + + ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN0, &sn0); + if (ret) + return ret; + + ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN1, &sn1); + if (ret) + return ret; + + intf->serial_number = (u64)sn1 << 32 | sn0; + + return 0; +} + +static int gb_interface_read_dme(struct gb_interface *intf) +{ + int ret; + + /* DME attributes have already been read */ + if (intf->dme_read) + return 0; + + ret = gb_interface_dme_attr_get(intf, DME_DDBL1_MANUFACTURERID, + &intf->ddbl1_manufacturer_id); + if (ret) + return ret; + + ret = gb_interface_dme_attr_get(intf, DME_DDBL1_PRODUCTID, + &intf->ddbl1_product_id); + if (ret) + return ret; + + if (intf->ddbl1_manufacturer_id == TOSHIBA_DMID && + intf->ddbl1_product_id == TOSHIBA_ES2_BRIDGE_DPID) { + intf->quirks |= GB_INTERFACE_QUIRK_NO_GMP_IDS; + intf->quirks |= GB_INTERFACE_QUIRK_NO_INIT_STATUS; + } + + ret = gb_interface_read_ara_dme(intf); + if (ret) + return ret; + + intf->dme_read = true; + + return 0; +} + +static int gb_interface_route_create(struct gb_interface *intf) +{ + struct gb_svc *svc = intf->hd->svc; + u8 intf_id = intf->interface_id; + u8 device_id; + int ret; + + /* Allocate an interface device id. */ + ret = ida_simple_get(&svc->device_id_map, + GB_SVC_DEVICE_ID_MIN, GB_SVC_DEVICE_ID_MAX + 1, + GFP_KERNEL); + if (ret < 0) { + dev_err(&intf->dev, "failed to allocate device id: %d\n", ret); + return ret; + } + device_id = ret; + + ret = gb_svc_intf_device_id(svc, intf_id, device_id); + if (ret) { + dev_err(&intf->dev, "failed to set device id %u: %d\n", + device_id, ret); + goto err_ida_remove; + } + + /* FIXME: Hard-coded AP device id. */ + ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_SVC_DEVICE_ID_AP, + intf_id, device_id); + if (ret) { + dev_err(&intf->dev, "failed to create route: %d\n", ret); + goto err_svc_id_free; + } + + intf->device_id = device_id; + + return 0; + +err_svc_id_free: + /* + * XXX Should we tell SVC that this id doesn't belong to interface + * XXX anymore. + */ +err_ida_remove: + ida_simple_remove(&svc->device_id_map, device_id); + + return ret; +} + +static void gb_interface_route_destroy(struct gb_interface *intf) +{ + struct gb_svc *svc = intf->hd->svc; + + if (intf->device_id == GB_INTERFACE_DEVICE_ID_BAD) + return; + + gb_svc_route_destroy(svc, svc->ap_intf_id, intf->interface_id); + ida_simple_remove(&svc->device_id_map, intf->device_id); + intf->device_id = GB_INTERFACE_DEVICE_ID_BAD; +} + +/* Locking: Caller holds the interface mutex. */ +static int gb_interface_legacy_mode_switch(struct gb_interface *intf) +{ + int ret; + + dev_info(&intf->dev, "legacy mode switch detected\n"); + + /* Mark as disconnected to prevent I/O during disable. */ + intf->disconnected = true; + gb_interface_disable(intf); + intf->disconnected = false; + + ret = gb_interface_enable(intf); + if (ret) { + dev_err(&intf->dev, "failed to re-enable interface: %d\n", ret); + gb_interface_deactivate(intf); + } + + return ret; +} + +void gb_interface_mailbox_event(struct gb_interface *intf, u16 result, + u32 mailbox) +{ + mutex_lock(&intf->mutex); + + if (result) { + dev_warn(&intf->dev, + "mailbox event with UniPro error: 0x%04x\n", + result); + goto err_disable; + } + + if (mailbox != GB_SVC_INTF_MAILBOX_GREYBUS) { + dev_warn(&intf->dev, + "mailbox event with unexpected value: 0x%08x\n", + mailbox); + goto err_disable; + } + + if (intf->quirks & GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH) { + gb_interface_legacy_mode_switch(intf); + goto out_unlock; + } + + if (!intf->mode_switch) { + dev_warn(&intf->dev, "unexpected mailbox event: 0x%08x\n", + mailbox); + goto err_disable; + } + + dev_info(&intf->dev, "mode switch detected\n"); + + complete(&intf->mode_switch_completion); + +out_unlock: + mutex_unlock(&intf->mutex); + + return; + +err_disable: + gb_interface_disable(intf); + gb_interface_deactivate(intf); + mutex_unlock(&intf->mutex); +} + +static void gb_interface_mode_switch_work(struct work_struct *work) +{ + struct gb_interface *intf; + struct gb_control *control; + unsigned long timeout; + int ret; + + intf = container_of(work, struct gb_interface, mode_switch_work); + + mutex_lock(&intf->mutex); + /* Make sure interface is still enabled. */ + if (!intf->enabled) { + dev_dbg(&intf->dev, "mode switch aborted\n"); + intf->mode_switch = false; + mutex_unlock(&intf->mutex); + goto out_interface_put; + } + + /* + * Prepare the control device for mode switch and make sure to get an + * extra reference before it goes away during interface disable. + */ + control = gb_control_get(intf->control); + gb_control_mode_switch_prepare(control); + gb_interface_disable(intf); + mutex_unlock(&intf->mutex); + + timeout = msecs_to_jiffies(GB_INTERFACE_MODE_SWITCH_TIMEOUT); + ret = wait_for_completion_interruptible_timeout( + &intf->mode_switch_completion, timeout); + + /* Finalise control-connection mode switch. */ + gb_control_mode_switch_complete(control); + gb_control_put(control); + + if (ret < 0) { + dev_err(&intf->dev, "mode switch interrupted\n"); + goto err_deactivate; + } else if (ret == 0) { + dev_err(&intf->dev, "mode switch timed out\n"); + goto err_deactivate; + } + + /* Re-enable (re-enumerate) interface if still active. */ + mutex_lock(&intf->mutex); + intf->mode_switch = false; + if (intf->active) { + ret = gb_interface_enable(intf); + if (ret) { + dev_err(&intf->dev, "failed to re-enable interface: %d\n", + ret); + gb_interface_deactivate(intf); + } + } + mutex_unlock(&intf->mutex); + +out_interface_put: + gb_interface_put(intf); + + return; + +err_deactivate: + mutex_lock(&intf->mutex); + intf->mode_switch = false; + gb_interface_deactivate(intf); + mutex_unlock(&intf->mutex); + + gb_interface_put(intf); +} + +int gb_interface_request_mode_switch(struct gb_interface *intf) +{ + int ret = 0; + + mutex_lock(&intf->mutex); + if (intf->mode_switch) { + ret = -EBUSY; + goto out_unlock; + } + + intf->mode_switch = true; + reinit_completion(&intf->mode_switch_completion); + + /* + * Get a reference to the interface device, which will be put once the + * mode switch is complete. + */ + get_device(&intf->dev); + + if (!queue_work(system_long_wq, &intf->mode_switch_work)) { + put_device(&intf->dev); + ret = -EBUSY; + goto out_unlock; + } + +out_unlock: + mutex_unlock(&intf->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(gb_interface_request_mode_switch); + +/* + * T_TstSrcIncrement is written by the module on ES2 as a stand-in for the + * init-status attribute DME_TOSHIBA_INIT_STATUS. The AP needs to read and + * clear it after reading a non-zero value from it. + * + * FIXME: This is module-hardware dependent and needs to be extended for every + * type of module we want to support. + */ +static int gb_interface_read_and_clear_init_status(struct gb_interface *intf) +{ + struct gb_host_device *hd = intf->hd; + unsigned long bootrom_quirks; + unsigned long s2l_quirks; + int ret; + u32 value; + u16 attr; + u8 init_status; + + /* + * ES2 bridges use T_TstSrcIncrement for the init status. + * + * FIXME: Remove ES2 support + */ + if (intf->quirks & GB_INTERFACE_QUIRK_NO_INIT_STATUS) + attr = DME_T_TST_SRC_INCREMENT; + else + attr = DME_TOSHIBA_GMP_INIT_STATUS; + + ret = gb_svc_dme_peer_get(hd->svc, intf->interface_id, attr, + DME_SELECTOR_INDEX_NULL, &value); + if (ret) + return ret; + + /* + * A nonzero init status indicates the module has finished + * initializing. + */ + if (!value) { + dev_err(&intf->dev, "invalid init status\n"); + return -ENODEV; + } + + /* + * Extract the init status. + * + * For ES2: We need to check lowest 8 bits of 'value'. + * For ES3: We need to check highest 8 bits out of 32 of 'value'. + * + * FIXME: Remove ES2 support + */ + if (intf->quirks & GB_INTERFACE_QUIRK_NO_INIT_STATUS) + init_status = value & 0xff; + else + init_status = value >> 24; + + /* + * Check if the interface is executing the quirky ES3 bootrom that, + * for example, requires E2EFC, CSD and CSV to be disabled. + */ + bootrom_quirks = GB_INTERFACE_QUIRK_NO_CPORT_FEATURES | + GB_INTERFACE_QUIRK_FORCED_DISABLE | + GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH | + GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE; + + s2l_quirks = GB_INTERFACE_QUIRK_NO_PM; + + switch (init_status) { + case GB_INIT_BOOTROM_UNIPRO_BOOT_STARTED: + case GB_INIT_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED: + intf->quirks |= bootrom_quirks; + break; + case GB_INIT_S2_LOADER_BOOT_STARTED: + /* S2 Loader doesn't support runtime PM */ + intf->quirks &= ~bootrom_quirks; + intf->quirks |= s2l_quirks; + break; + default: + intf->quirks &= ~bootrom_quirks; + intf->quirks &= ~s2l_quirks; + } + + /* Clear the init status. */ + return gb_svc_dme_peer_set(hd->svc, intf->interface_id, attr, + DME_SELECTOR_INDEX_NULL, 0); +} + +/* interface sysfs attributes */ +#define gb_interface_attr(field, type) \ +static ssize_t field##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct gb_interface *intf = to_gb_interface(dev); \ + return scnprintf(buf, PAGE_SIZE, type"\n", intf->field); \ +} \ +static DEVICE_ATTR_RO(field) + +gb_interface_attr(ddbl1_manufacturer_id, "0x%08x"); +gb_interface_attr(ddbl1_product_id, "0x%08x"); +gb_interface_attr(interface_id, "%u"); +gb_interface_attr(vendor_id, "0x%08x"); +gb_interface_attr(product_id, "0x%08x"); +gb_interface_attr(serial_number, "0x%016llx"); + +static ssize_t voltage_now_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_interface *intf = to_gb_interface(dev); + int ret; + u32 measurement; + + ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id, + GB_SVC_PWRMON_TYPE_VOL, + &measurement); + if (ret) { + dev_err(&intf->dev, "failed to get voltage sample (%d)\n", ret); + return ret; + } + + return sprintf(buf, "%u\n", measurement); +} +static DEVICE_ATTR_RO(voltage_now); + +static ssize_t current_now_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_interface *intf = to_gb_interface(dev); + int ret; + u32 measurement; + + ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id, + GB_SVC_PWRMON_TYPE_CURR, + &measurement); + if (ret) { + dev_err(&intf->dev, "failed to get current sample (%d)\n", ret); + return ret; + } + + return sprintf(buf, "%u\n", measurement); +} +static DEVICE_ATTR_RO(current_now); + +static ssize_t power_now_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_interface *intf = to_gb_interface(dev); + int ret; + u32 measurement; + + ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id, + GB_SVC_PWRMON_TYPE_PWR, + &measurement); + if (ret) { + dev_err(&intf->dev, "failed to get power sample (%d)\n", ret); + return ret; + } + + return sprintf(buf, "%u\n", measurement); +} +static DEVICE_ATTR_RO(power_now); + +static ssize_t power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_interface *intf = to_gb_interface(dev); + + if (intf->active) + return scnprintf(buf, PAGE_SIZE, "on\n"); + else + return scnprintf(buf, PAGE_SIZE, "off\n"); +} + +static ssize_t power_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t len) +{ + struct gb_interface *intf = to_gb_interface(dev); + bool activate; + int ret = 0; + + if (kstrtobool(buf, &activate)) + return -EINVAL; + + mutex_lock(&intf->mutex); + + if (activate == intf->active) + goto unlock; + + if (activate) { + ret = gb_interface_activate(intf); + if (ret) { + dev_err(&intf->dev, + "failed to activate interface: %d\n", ret); + goto unlock; + } + + ret = gb_interface_enable(intf); + if (ret) { + dev_err(&intf->dev, + "failed to enable interface: %d\n", ret); + gb_interface_deactivate(intf); + goto unlock; + } + } else { + gb_interface_disable(intf); + gb_interface_deactivate(intf); + } + +unlock: + mutex_unlock(&intf->mutex); + + if (ret) + return ret; + + return len; +} +static DEVICE_ATTR_RW(power_state); + +static const char *gb_interface_type_string(struct gb_interface *intf) +{ + static const char * const types[] = { + [GB_INTERFACE_TYPE_INVALID] = "invalid", + [GB_INTERFACE_TYPE_UNKNOWN] = "unknown", + [GB_INTERFACE_TYPE_DUMMY] = "dummy", + [GB_INTERFACE_TYPE_UNIPRO] = "unipro", + [GB_INTERFACE_TYPE_GREYBUS] = "greybus", + }; + + return types[intf->type]; +} + +static ssize_t interface_type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gb_interface *intf = to_gb_interface(dev); + + return sprintf(buf, "%s\n", gb_interface_type_string(intf)); +} +static DEVICE_ATTR_RO(interface_type); + +static struct attribute *interface_unipro_attrs[] = { + &dev_attr_ddbl1_manufacturer_id.attr, + &dev_attr_ddbl1_product_id.attr, + NULL +}; + +static struct attribute *interface_greybus_attrs[] = { + &dev_attr_vendor_id.attr, + &dev_attr_product_id.attr, + &dev_attr_serial_number.attr, + NULL +}; + +static struct attribute *interface_power_attrs[] = { + &dev_attr_voltage_now.attr, + &dev_attr_current_now.attr, + &dev_attr_power_now.attr, + &dev_attr_power_state.attr, + NULL +}; + +static struct attribute *interface_common_attrs[] = { + &dev_attr_interface_id.attr, + &dev_attr_interface_type.attr, + NULL +}; + +static umode_t interface_unipro_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct gb_interface *intf = to_gb_interface(dev); + + switch (intf->type) { + case GB_INTERFACE_TYPE_UNIPRO: + case GB_INTERFACE_TYPE_GREYBUS: + return attr->mode; + default: + return 0; + } +} + +static umode_t interface_greybus_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct gb_interface *intf = to_gb_interface(dev); + + switch (intf->type) { + case GB_INTERFACE_TYPE_GREYBUS: + return attr->mode; + default: + return 0; + } +} + +static umode_t interface_power_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct gb_interface *intf = to_gb_interface(dev); + + switch (intf->type) { + case GB_INTERFACE_TYPE_UNIPRO: + case GB_INTERFACE_TYPE_GREYBUS: + return attr->mode; + default: + return 0; + } +} + +static const struct attribute_group interface_unipro_group = { + .is_visible = interface_unipro_is_visible, + .attrs = interface_unipro_attrs, +}; + +static const struct attribute_group interface_greybus_group = { + .is_visible = interface_greybus_is_visible, + .attrs = interface_greybus_attrs, +}; + +static const struct attribute_group interface_power_group = { + .is_visible = interface_power_is_visible, + .attrs = interface_power_attrs, +}; + +static const struct attribute_group interface_common_group = { + .attrs = interface_common_attrs, +}; + +static const struct attribute_group *interface_groups[] = { + &interface_unipro_group, + &interface_greybus_group, + &interface_power_group, + &interface_common_group, + NULL +}; + +static void gb_interface_release(struct device *dev) +{ + struct gb_interface *intf = to_gb_interface(dev); + + trace_gb_interface_release(intf); + + kfree(intf); +} + +#ifdef CONFIG_PM +static int gb_interface_suspend(struct device *dev) +{ + struct gb_interface *intf = to_gb_interface(dev); + int ret; + + ret = gb_control_interface_suspend_prepare(intf->control); + if (ret) + return ret; + + ret = gb_control_suspend(intf->control); + if (ret) + goto err_hibernate_abort; + + ret = gb_interface_hibernate_link(intf); + if (ret) + return ret; + + /* Delay to allow interface to enter standby before disabling refclk */ + msleep(GB_INTERFACE_SUSPEND_HIBERNATE_DELAY_MS); + + ret = gb_interface_refclk_set(intf, false); + if (ret) + return ret; + + return 0; + +err_hibernate_abort: + gb_control_interface_hibernate_abort(intf->control); + + return ret; +} + +static int gb_interface_resume(struct device *dev) +{ + struct gb_interface *intf = to_gb_interface(dev); + struct gb_svc *svc = intf->hd->svc; + int ret; + + ret = gb_interface_refclk_set(intf, true); + if (ret) + return ret; + + ret = gb_svc_intf_resume(svc, intf->interface_id); + if (ret) + return ret; + + ret = gb_control_resume(intf->control); + if (ret) + return ret; + + return 0; +} + +static int gb_interface_runtime_idle(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + pm_request_autosuspend(dev); + + return 0; +} +#endif + +static const struct dev_pm_ops gb_interface_pm_ops = { + SET_RUNTIME_PM_OPS(gb_interface_suspend, gb_interface_resume, + gb_interface_runtime_idle) +}; + +struct device_type greybus_interface_type = { + .name = "greybus_interface", + .release = gb_interface_release, + .pm = &gb_interface_pm_ops, +}; + +/* + * A Greybus module represents a user-replaceable component on a GMP + * phone. An interface is the physical connection on that module. A + * module may have more than one interface. + * + * Create a gb_interface structure to represent a discovered interface. + * The position of interface within the Endo is encoded in "interface_id" + * argument. + * + * Returns a pointer to the new interfce or a null pointer if a + * failure occurs due to memory exhaustion. + */ +struct gb_interface *gb_interface_create(struct gb_module *module, + u8 interface_id) +{ + struct gb_host_device *hd = module->hd; + struct gb_interface *intf; + + intf = kzalloc(sizeof(*intf), GFP_KERNEL); + if (!intf) + return NULL; + + intf->hd = hd; /* XXX refcount? */ + intf->module = module; + intf->interface_id = interface_id; + INIT_LIST_HEAD(&intf->bundles); + INIT_LIST_HEAD(&intf->manifest_descs); + mutex_init(&intf->mutex); + INIT_WORK(&intf->mode_switch_work, gb_interface_mode_switch_work); + init_completion(&intf->mode_switch_completion); + + /* Invalid device id to start with */ + intf->device_id = GB_INTERFACE_DEVICE_ID_BAD; + + intf->dev.parent = &module->dev; + intf->dev.bus = &greybus_bus_type; + intf->dev.type = &greybus_interface_type; + intf->dev.groups = interface_groups; + intf->dev.dma_mask = module->dev.dma_mask; + device_initialize(&intf->dev); + dev_set_name(&intf->dev, "%s.%u", dev_name(&module->dev), + interface_id); + + pm_runtime_set_autosuspend_delay(&intf->dev, + GB_INTERFACE_AUTOSUSPEND_MS); + + trace_gb_interface_create(intf); + + return intf; +} + +static int gb_interface_vsys_set(struct gb_interface *intf, bool enable) +{ + struct gb_svc *svc = intf->hd->svc; + int ret; + + dev_dbg(&intf->dev, "%s - %d\n", __func__, enable); + + ret = gb_svc_intf_vsys_set(svc, intf->interface_id, enable); + if (ret) { + dev_err(&intf->dev, "failed to set v_sys: %d\n", ret); + return ret; + } + + return 0; +} + +static int gb_interface_refclk_set(struct gb_interface *intf, bool enable) +{ + struct gb_svc *svc = intf->hd->svc; + int ret; + + dev_dbg(&intf->dev, "%s - %d\n", __func__, enable); + + ret = gb_svc_intf_refclk_set(svc, intf->interface_id, enable); + if (ret) { + dev_err(&intf->dev, "failed to set refclk: %d\n", ret); + return ret; + } + + return 0; +} + +static int gb_interface_unipro_set(struct gb_interface *intf, bool enable) +{ + struct gb_svc *svc = intf->hd->svc; + int ret; + + dev_dbg(&intf->dev, "%s - %d\n", __func__, enable); + + ret = gb_svc_intf_unipro_set(svc, intf->interface_id, enable); + if (ret) { + dev_err(&intf->dev, "failed to set UniPro: %d\n", ret); + return ret; + } + + return 0; +} + +static int gb_interface_activate_operation(struct gb_interface *intf, + enum gb_interface_type *intf_type) +{ + struct gb_svc *svc = intf->hd->svc; + u8 type; + int ret; + + dev_dbg(&intf->dev, "%s\n", __func__); + + ret = gb_svc_intf_activate(svc, intf->interface_id, &type); + if (ret) { + dev_err(&intf->dev, "failed to activate: %d\n", ret); + return ret; + } + + switch (type) { + case GB_SVC_INTF_TYPE_DUMMY: + *intf_type = GB_INTERFACE_TYPE_DUMMY; + /* FIXME: handle as an error for now */ + return -ENODEV; + case GB_SVC_INTF_TYPE_UNIPRO: + *intf_type = GB_INTERFACE_TYPE_UNIPRO; + dev_err(&intf->dev, "interface type UniPro not supported\n"); + /* FIXME: handle as an error for now */ + return -ENODEV; + case GB_SVC_INTF_TYPE_GREYBUS: + *intf_type = GB_INTERFACE_TYPE_GREYBUS; + break; + default: + dev_err(&intf->dev, "unknown interface type: %u\n", type); + *intf_type = GB_INTERFACE_TYPE_UNKNOWN; + return -ENODEV; + } + + return 0; +} + +static int gb_interface_hibernate_link(struct gb_interface *intf) +{ + struct gb_svc *svc = intf->hd->svc; + + return gb_svc_intf_set_power_mode_hibernate(svc, intf->interface_id); +} + +static int _gb_interface_activate(struct gb_interface *intf, + enum gb_interface_type *type) +{ + int ret; + + *type = GB_INTERFACE_TYPE_UNKNOWN; + + if (intf->ejected || intf->removed) + return -ENODEV; + + ret = gb_interface_vsys_set(intf, true); + if (ret) + return ret; + + ret = gb_interface_refclk_set(intf, true); + if (ret) + goto err_vsys_disable; + + ret = gb_interface_unipro_set(intf, true); + if (ret) + goto err_refclk_disable; + + ret = gb_interface_activate_operation(intf, type); + if (ret) { + switch (*type) { + case GB_INTERFACE_TYPE_UNIPRO: + case GB_INTERFACE_TYPE_GREYBUS: + goto err_hibernate_link; + default: + goto err_unipro_disable; + } + } + + ret = gb_interface_read_dme(intf); + if (ret) + goto err_hibernate_link; + + ret = gb_interface_route_create(intf); + if (ret) + goto err_hibernate_link; + + intf->active = true; + + trace_gb_interface_activate(intf); + + return 0; + +err_hibernate_link: + gb_interface_hibernate_link(intf); +err_unipro_disable: + gb_interface_unipro_set(intf, false); +err_refclk_disable: + gb_interface_refclk_set(intf, false); +err_vsys_disable: + gb_interface_vsys_set(intf, false); + + return ret; +} + +/* + * At present, we assume a UniPro-only module to be a Greybus module that + * failed to send its mailbox poke. There is some reason to believe that this + * is because of a bug in the ES3 bootrom. + * + * FIXME: Check if this is a Toshiba bridge before retrying? + */ +static int _gb_interface_activate_es3_hack(struct gb_interface *intf, + enum gb_interface_type *type) +{ + int retries = 3; + int ret; + + while (retries--) { + ret = _gb_interface_activate(intf, type); + if (ret == -ENODEV && *type == GB_INTERFACE_TYPE_UNIPRO) + continue; + + break; + } + + return ret; +} + +/* + * Activate an interface. + * + * Locking: Caller holds the interface mutex. + */ +int gb_interface_activate(struct gb_interface *intf) +{ + enum gb_interface_type type; + int ret; + + switch (intf->type) { + case GB_INTERFACE_TYPE_INVALID: + case GB_INTERFACE_TYPE_GREYBUS: + ret = _gb_interface_activate_es3_hack(intf, &type); + break; + default: + ret = _gb_interface_activate(intf, &type); + } + + /* Make sure type is detected correctly during reactivation. */ + if (intf->type != GB_INTERFACE_TYPE_INVALID) { + if (type != intf->type) { + dev_err(&intf->dev, "failed to detect interface type\n"); + + if (!ret) + gb_interface_deactivate(intf); + + return -EIO; + } + } else { + intf->type = type; + } + + return ret; +} + +/* + * Deactivate an interface. + * + * Locking: Caller holds the interface mutex. + */ +void gb_interface_deactivate(struct gb_interface *intf) +{ + if (!intf->active) + return; + + trace_gb_interface_deactivate(intf); + + /* Abort any ongoing mode switch. */ + if (intf->mode_switch) + complete(&intf->mode_switch_completion); + + gb_interface_route_destroy(intf); + gb_interface_hibernate_link(intf); + gb_interface_unipro_set(intf, false); + gb_interface_refclk_set(intf, false); + gb_interface_vsys_set(intf, false); + + intf->active = false; +} + +/* + * Enable an interface by enabling its control connection, fetching the + * manifest and other information over it, and finally registering its child + * devices. + * + * Locking: Caller holds the interface mutex. + */ +int gb_interface_enable(struct gb_interface *intf) +{ + struct gb_control *control; + struct gb_bundle *bundle, *tmp; + int ret, size; + void *manifest; + + ret = gb_interface_read_and_clear_init_status(intf); + if (ret) { + dev_err(&intf->dev, "failed to clear init status: %d\n", ret); + return ret; + } + + /* Establish control connection */ + control = gb_control_create(intf); + if (IS_ERR(control)) { + dev_err(&intf->dev, "failed to create control device: %ld\n", + PTR_ERR(control)); + return PTR_ERR(control); + } + intf->control = control; + + ret = gb_control_enable(intf->control); + if (ret) + goto err_put_control; + + /* Get manifest size using control protocol on CPort */ + size = gb_control_get_manifest_size_operation(intf); + if (size <= 0) { + dev_err(&intf->dev, "failed to get manifest size: %d\n", size); + + if (size) + ret = size; + else + ret = -EINVAL; + + goto err_disable_control; + } + + manifest = kmalloc(size, GFP_KERNEL); + if (!manifest) { + ret = -ENOMEM; + goto err_disable_control; + } + + /* Get manifest using control protocol on CPort */ + ret = gb_control_get_manifest_operation(intf, manifest, size); + if (ret) { + dev_err(&intf->dev, "failed to get manifest: %d\n", ret); + goto err_free_manifest; + } + + /* + * Parse the manifest and build up our data structures representing + * what's in it. + */ + if (!gb_manifest_parse(intf, manifest, size)) { + dev_err(&intf->dev, "failed to parse manifest\n"); + ret = -EINVAL; + goto err_destroy_bundles; + } + + ret = gb_control_get_bundle_versions(intf->control); + if (ret) + goto err_destroy_bundles; + + /* Register the control device and any bundles */ + ret = gb_control_add(intf->control); + if (ret) + goto err_destroy_bundles; + + pm_runtime_use_autosuspend(&intf->dev); + pm_runtime_get_noresume(&intf->dev); + pm_runtime_set_active(&intf->dev); + pm_runtime_enable(&intf->dev); + + list_for_each_entry_safe_reverse(bundle, tmp, &intf->bundles, links) { + ret = gb_bundle_add(bundle); + if (ret) { + gb_bundle_destroy(bundle); + continue; + } + } + + kfree(manifest); + + intf->enabled = true; + + pm_runtime_put(&intf->dev); + + trace_gb_interface_enable(intf); + + return 0; + +err_destroy_bundles: + list_for_each_entry_safe(bundle, tmp, &intf->bundles, links) + gb_bundle_destroy(bundle); +err_free_manifest: + kfree(manifest); +err_disable_control: + gb_control_disable(intf->control); +err_put_control: + gb_control_put(intf->control); + intf->control = NULL; + + return ret; +} + +/* + * Disable an interface and destroy its bundles. + * + * Locking: Caller holds the interface mutex. + */ +void gb_interface_disable(struct gb_interface *intf) +{ + struct gb_bundle *bundle; + struct gb_bundle *next; + + if (!intf->enabled) + return; + + trace_gb_interface_disable(intf); + + pm_runtime_get_sync(&intf->dev); + + /* Set disconnected flag to avoid I/O during connection tear down. */ + if (intf->quirks & GB_INTERFACE_QUIRK_FORCED_DISABLE) + intf->disconnected = true; + + list_for_each_entry_safe(bundle, next, &intf->bundles, links) + gb_bundle_destroy(bundle); + + if (!intf->mode_switch && !intf->disconnected) + gb_control_interface_deactivate_prepare(intf->control); + + gb_control_del(intf->control); + gb_control_disable(intf->control); + gb_control_put(intf->control); + intf->control = NULL; + + intf->enabled = false; + + pm_runtime_disable(&intf->dev); + pm_runtime_set_suspended(&intf->dev); + pm_runtime_dont_use_autosuspend(&intf->dev); + pm_runtime_put_noidle(&intf->dev); +} + +/* Register an interface. */ +int gb_interface_add(struct gb_interface *intf) +{ + int ret; + + ret = device_add(&intf->dev); + if (ret) { + dev_err(&intf->dev, "failed to register interface: %d\n", ret); + return ret; + } + + trace_gb_interface_add(intf); + + dev_info(&intf->dev, "Interface added (%s)\n", + gb_interface_type_string(intf)); + + switch (intf->type) { + case GB_INTERFACE_TYPE_GREYBUS: + dev_info(&intf->dev, "GMP VID=0x%08x, PID=0x%08x\n", + intf->vendor_id, intf->product_id); + fallthrough; + case GB_INTERFACE_TYPE_UNIPRO: + dev_info(&intf->dev, "DDBL1 Manufacturer=0x%08x, Product=0x%08x\n", + intf->ddbl1_manufacturer_id, + intf->ddbl1_product_id); + break; + default: + break; + } + + return 0; +} + +/* Deregister an interface. */ +void gb_interface_del(struct gb_interface *intf) +{ + if (device_is_registered(&intf->dev)) { + trace_gb_interface_del(intf); + + device_del(&intf->dev); + dev_info(&intf->dev, "Interface removed\n"); + } +} + +void gb_interface_put(struct gb_interface *intf) +{ + put_device(&intf->dev); +} |