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|
/*
* Greybus interface code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include "greybus.h"
#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_GPBRIDGE_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;
}
/*
* 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;
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_ARA_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
* requires E2EFC, CSD and CSV to be disabled.
*/
switch (init_status) {
case GB_INIT_BOOTROM_UNIPRO_BOOT_STARTED:
case GB_INIT_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED:
intf->quirks |= GB_INTERFACE_QUIRK_NO_CPORT_FEATURES;
break;
default:
intf->quirks &= ~GB_INTERFACE_QUIRK_NO_CPORT_FEATURES;
}
/* 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 struct attribute *interface_attrs[] = {
&dev_attr_ddbl1_manufacturer_id.attr,
&dev_attr_ddbl1_product_id.attr,
&dev_attr_interface_id.attr,
&dev_attr_vendor_id.attr,
&dev_attr_product_id.attr,
&dev_attr_serial_number.attr,
&dev_attr_voltage_now.attr,
&dev_attr_current_now.attr,
&dev_attr_power_now.attr,
NULL,
};
ATTRIBUTE_GROUPS(interface);
static void gb_interface_release(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
kfree(intf);
}
struct device_type greybus_interface_type = {
.name = "greybus_interface",
.release = gb_interface_release,
};
/*
* A Greybus module represents a user-replaceable component on an Ara
* 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);
/* 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);
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 enable 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 enable 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 enable UniPro: %d\n", ret);
return ret;
}
return 0;
}
static int gb_interface_activate_operation(struct gb_interface *intf)
{
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:
dev_info(&intf->dev, "dummy interface detected\n");
/* FIXME: handle as an error for now */
return -ENODEV;
case GB_SVC_INTF_TYPE_UNIPRO:
dev_err(&intf->dev, "interface type UniPro not supported\n");
return -ENODEV;
case GB_SVC_INTF_TYPE_GREYBUS:
break;
default:
dev_err(&intf->dev, "unknown interface type: %u\n", type);
return -ENODEV;
}
return 0;
}
static int gb_interface_hibernate_link(struct gb_interface *intf)
{
dev_dbg(&intf->dev, "%s\n", __func__);
/* FIXME: implement */
return 0;
}
/*
* Activate an interface.
*
* Locking: Caller holds the interface mutex.
*/
int gb_interface_activate(struct gb_interface *intf)
{
int ret;
if (intf->ejected)
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);
if (ret)
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;
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;
}
/*
* Deactivate an interface.
*
* Locking: Caller holds the interface mutex.
*/
void gb_interface_deactivate(struct gb_interface *intf)
{
if (!intf->active)
return;
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;
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;
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;
/*
* Disable the control-connection early to avoid operation timeouts
* when the interface is already gone.
*/
if (intf->disconnected)
gb_control_disable(intf->control);
list_for_each_entry_safe(bundle, next, &intf->bundles, links)
gb_bundle_destroy(bundle);
gb_control_del(intf->control);
gb_control_disable(intf->control);
gb_control_put(intf->control);
intf->control = NULL;
intf->enabled = false;
}
/* 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;
}
dev_info(&intf->dev, "Interface added: VID=0x%08x, PID=0x%08x\n",
intf->vendor_id, intf->product_id);
dev_info(&intf->dev, "DDBL1 Manufacturer=0x%08x, Product=0x%08x\n",
intf->ddbl1_manufacturer_id, intf->ddbl1_product_id);
return 0;
}
/* Deregister an interface. */
void gb_interface_del(struct gb_interface *intf)
{
if (device_is_registered(&intf->dev)) {
device_del(&intf->dev);
dev_info(&intf->dev, "Interface removed\n");
}
}
void gb_interface_put(struct gb_interface *intf)
{
put_device(&intf->dev);
}
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