1264 lines
29 KiB
C
1264 lines
29 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Greybus interface code
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*
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* Copyright 2014 Google Inc.
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* Copyright 2014 Linaro Ltd.
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*/
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#include <linux/delay.h>
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#include <linux/greybus.h>
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#include "greybus_trace.h"
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#define GB_INTERFACE_MODE_SWITCH_TIMEOUT 2000
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#define GB_INTERFACE_DEVICE_ID_BAD 0xff
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#define GB_INTERFACE_AUTOSUSPEND_MS 3000
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/* Time required for interface to enter standby before disabling REFCLK */
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#define GB_INTERFACE_SUSPEND_HIBERNATE_DELAY_MS 20
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/* Don't-care selector index */
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#define DME_SELECTOR_INDEX_NULL 0
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/* DME attributes */
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/* FIXME: remove ES2 support and DME_T_TST_SRC_INCREMENT */
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#define DME_T_TST_SRC_INCREMENT 0x4083
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#define DME_DDBL1_MANUFACTURERID 0x5003
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#define DME_DDBL1_PRODUCTID 0x5004
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#define DME_TOSHIBA_GMP_VID 0x6000
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#define DME_TOSHIBA_GMP_PID 0x6001
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#define DME_TOSHIBA_GMP_SN0 0x6002
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#define DME_TOSHIBA_GMP_SN1 0x6003
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#define DME_TOSHIBA_GMP_INIT_STATUS 0x6101
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/* DDBL1 Manufacturer and Product ids */
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#define TOSHIBA_DMID 0x0126
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#define TOSHIBA_ES2_BRIDGE_DPID 0x1000
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#define TOSHIBA_ES3_APBRIDGE_DPID 0x1001
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#define TOSHIBA_ES3_GBPHY_DPID 0x1002
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static int gb_interface_hibernate_link(struct gb_interface *intf);
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static int gb_interface_refclk_set(struct gb_interface *intf, bool enable);
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static int gb_interface_dme_attr_get(struct gb_interface *intf,
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u16 attr, u32 *val)
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{
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return gb_svc_dme_peer_get(intf->hd->svc, intf->interface_id,
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attr, DME_SELECTOR_INDEX_NULL, val);
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}
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static int gb_interface_read_ara_dme(struct gb_interface *intf)
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{
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u32 sn0, sn1;
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int ret;
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/*
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* Unless this is a Toshiba bridge, bail out until we have defined
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* standard GMP attributes.
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*/
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if (intf->ddbl1_manufacturer_id != TOSHIBA_DMID) {
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dev_err(&intf->dev, "unknown manufacturer %08x\n",
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intf->ddbl1_manufacturer_id);
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return -ENODEV;
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}
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ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_VID,
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&intf->vendor_id);
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if (ret)
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return ret;
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ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_PID,
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&intf->product_id);
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if (ret)
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return ret;
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ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN0, &sn0);
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if (ret)
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return ret;
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ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN1, &sn1);
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if (ret)
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return ret;
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intf->serial_number = (u64)sn1 << 32 | sn0;
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return 0;
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}
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static int gb_interface_read_dme(struct gb_interface *intf)
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{
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int ret;
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/* DME attributes have already been read */
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if (intf->dme_read)
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return 0;
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ret = gb_interface_dme_attr_get(intf, DME_DDBL1_MANUFACTURERID,
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&intf->ddbl1_manufacturer_id);
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if (ret)
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return ret;
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ret = gb_interface_dme_attr_get(intf, DME_DDBL1_PRODUCTID,
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&intf->ddbl1_product_id);
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if (ret)
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return ret;
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if (intf->ddbl1_manufacturer_id == TOSHIBA_DMID &&
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intf->ddbl1_product_id == TOSHIBA_ES2_BRIDGE_DPID) {
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intf->quirks |= GB_INTERFACE_QUIRK_NO_GMP_IDS;
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intf->quirks |= GB_INTERFACE_QUIRK_NO_INIT_STATUS;
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}
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ret = gb_interface_read_ara_dme(intf);
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if (ret)
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return ret;
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intf->dme_read = true;
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return 0;
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}
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static int gb_interface_route_create(struct gb_interface *intf)
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{
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struct gb_svc *svc = intf->hd->svc;
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u8 intf_id = intf->interface_id;
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u8 device_id;
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int ret;
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/* Allocate an interface device id. */
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ret = ida_simple_get(&svc->device_id_map,
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GB_SVC_DEVICE_ID_MIN, GB_SVC_DEVICE_ID_MAX + 1,
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GFP_KERNEL);
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if (ret < 0) {
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dev_err(&intf->dev, "failed to allocate device id: %d\n", ret);
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return ret;
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}
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device_id = ret;
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ret = gb_svc_intf_device_id(svc, intf_id, device_id);
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if (ret) {
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dev_err(&intf->dev, "failed to set device id %u: %d\n",
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device_id, ret);
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goto err_ida_remove;
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}
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/* FIXME: Hard-coded AP device id. */
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ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_SVC_DEVICE_ID_AP,
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intf_id, device_id);
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if (ret) {
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dev_err(&intf->dev, "failed to create route: %d\n", ret);
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goto err_svc_id_free;
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}
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intf->device_id = device_id;
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return 0;
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err_svc_id_free:
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/*
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* XXX Should we tell SVC that this id doesn't belong to interface
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* XXX anymore.
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*/
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err_ida_remove:
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ida_simple_remove(&svc->device_id_map, device_id);
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return ret;
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}
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static void gb_interface_route_destroy(struct gb_interface *intf)
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{
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struct gb_svc *svc = intf->hd->svc;
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if (intf->device_id == GB_INTERFACE_DEVICE_ID_BAD)
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return;
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gb_svc_route_destroy(svc, svc->ap_intf_id, intf->interface_id);
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ida_simple_remove(&svc->device_id_map, intf->device_id);
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intf->device_id = GB_INTERFACE_DEVICE_ID_BAD;
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}
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/* Locking: Caller holds the interface mutex. */
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static int gb_interface_legacy_mode_switch(struct gb_interface *intf)
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{
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int ret;
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dev_info(&intf->dev, "legacy mode switch detected\n");
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/* Mark as disconnected to prevent I/O during disable. */
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intf->disconnected = true;
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gb_interface_disable(intf);
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intf->disconnected = false;
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ret = gb_interface_enable(intf);
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if (ret) {
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dev_err(&intf->dev, "failed to re-enable interface: %d\n", ret);
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gb_interface_deactivate(intf);
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}
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return ret;
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}
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void gb_interface_mailbox_event(struct gb_interface *intf, u16 result,
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u32 mailbox)
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{
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mutex_lock(&intf->mutex);
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if (result) {
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dev_warn(&intf->dev,
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"mailbox event with UniPro error: 0x%04x\n",
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result);
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goto err_disable;
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}
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if (mailbox != GB_SVC_INTF_MAILBOX_GREYBUS) {
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dev_warn(&intf->dev,
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"mailbox event with unexpected value: 0x%08x\n",
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mailbox);
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goto err_disable;
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}
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if (intf->quirks & GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH) {
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gb_interface_legacy_mode_switch(intf);
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goto out_unlock;
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}
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if (!intf->mode_switch) {
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dev_warn(&intf->dev, "unexpected mailbox event: 0x%08x\n",
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mailbox);
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goto err_disable;
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}
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dev_info(&intf->dev, "mode switch detected\n");
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complete(&intf->mode_switch_completion);
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out_unlock:
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mutex_unlock(&intf->mutex);
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return;
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err_disable:
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gb_interface_disable(intf);
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gb_interface_deactivate(intf);
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mutex_unlock(&intf->mutex);
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}
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static void gb_interface_mode_switch_work(struct work_struct *work)
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{
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struct gb_interface *intf;
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struct gb_control *control;
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unsigned long timeout;
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int ret;
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intf = container_of(work, struct gb_interface, mode_switch_work);
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||
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mutex_lock(&intf->mutex);
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||
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/* Make sure interface is still enabled. */
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if (!intf->enabled) {
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||
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dev_dbg(&intf->dev, "mode switch aborted\n");
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intf->mode_switch = false;
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mutex_unlock(&intf->mutex);
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goto out_interface_put;
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}
|
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/*
|
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* Prepare the control device for mode switch and make sure to get an
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* extra reference before it goes away during interface disable.
|
||
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*/
|
||
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control = gb_control_get(intf->control);
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||
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gb_control_mode_switch_prepare(control);
|
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|
gb_interface_disable(intf);
|
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mutex_unlock(&intf->mutex);
|
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|
|
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timeout = msecs_to_jiffies(GB_INTERFACE_MODE_SWITCH_TIMEOUT);
|
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|
ret = wait_for_completion_interruptible_timeout(
|
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&intf->mode_switch_completion, timeout);
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/* Finalise control-connection mode switch. */
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gb_control_mode_switch_complete(control);
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gb_control_put(control);
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||
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||
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if (ret < 0) {
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||
|
dev_err(&intf->dev, "mode switch interrupted\n");
|
||
|
goto err_deactivate;
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||
|
} else if (ret == 0) {
|
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|
dev_err(&intf->dev, "mode switch timed out\n");
|
||
|
goto err_deactivate;
|
||
|
}
|
||
|
|
||
|
/* Re-enable (re-enumerate) interface if still active. */
|
||
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mutex_lock(&intf->mutex);
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intf->mode_switch = false;
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if (intf->active) {
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|
ret = gb_interface_enable(intf);
|
||
|
if (ret) {
|
||
|
dev_err(&intf->dev, "failed to re-enable interface: %d\n",
|
||
|
ret);
|
||
|
gb_interface_deactivate(intf);
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||
|
}
|
||
|
}
|
||
|
mutex_unlock(&intf->mutex);
|
||
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|
||
|
out_interface_put:
|
||
|
gb_interface_put(intf);
|
||
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|
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return;
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||
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err_deactivate:
|
||
|
mutex_lock(&intf->mutex);
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intf->mode_switch = false;
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gb_interface_deactivate(intf);
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||
|
mutex_unlock(&intf->mutex);
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||
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||
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gb_interface_put(intf);
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}
|
||
|
|
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int gb_interface_request_mode_switch(struct gb_interface *intf)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
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||
|
mutex_lock(&intf->mutex);
|
||
|
if (intf->mode_switch) {
|
||
|
ret = -EBUSY;
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||
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goto out_unlock;
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}
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||
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||
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intf->mode_switch = true;
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reinit_completion(&intf->mode_switch_completion);
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||
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|
/*
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||
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* Get a reference to the interface device, which will be put once the
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||
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* mode switch is complete.
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||
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*/
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||
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get_device(&intf->dev);
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||
|
|
||
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if (!queue_work(system_long_wq, &intf->mode_switch_work)) {
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||
|
put_device(&intf->dev);
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||
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ret = -EBUSY;
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goto out_unlock;
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||
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}
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||
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||
|
out_unlock:
|
||
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mutex_unlock(&intf->mutex);
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||
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|
return ret;
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||
|
}
|
||
|
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);
|
||
|
}
|