/*
* Greybus interface code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
#include "greybus_trace.h"
#define GB_INTERFACE_MODE_SWITCH_TIMEOUT 2000
#define GB_INTERFACE_DEVICE_ID_BAD 0xff
/* 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_ARA_VID 0x6000
#define DME_TOSHIBA_ARA_PID 0x6001
#define DME_TOSHIBA_ARA_SN0 0x6002
#define DME_TOSHIBA_ARA_SN1 0x6003
#define DME_TOSHIBA_ARA_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_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 Ara 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_ARA_VID,
&intf->vendor_id);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_ARA_PID,
&intf->product_id);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_ARA_SN0, &sn0);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_ARA_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;
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_ARA_IDS;
intf->quirks |= GB_INTERFACE_QUIRK_NO_INIT_STATUS;
}
return gb_interface_read_ara_dme(intf);
}
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