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|
/*
* SVC Greybus driver.
*
* Copyright 2015 Google Inc.
* Copyright 2015 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/workqueue.h>
#include "greybus.h"
#define CPORT_FLAGS_E2EFC BIT(0)
#define CPORT_FLAGS_CSD_N BIT(1)
#define CPORT_FLAGS_CSV_N BIT(2)
struct gb_svc_deferred_request {
struct work_struct work;
struct gb_operation *operation;
};
static ssize_t endo_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
return sprintf(buf, "0x%04x\n", svc->endo_id);
}
static DEVICE_ATTR_RO(endo_id);
static ssize_t ap_intf_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_svc *svc = to_gb_svc(dev);
return sprintf(buf, "%u\n", svc->ap_intf_id);
}
static DEVICE_ATTR_RO(ap_intf_id);
static struct attribute *svc_attrs[] = {
&dev_attr_endo_id.attr,
&dev_attr_ap_intf_id.attr,
NULL,
};
ATTRIBUTE_GROUPS(svc);
static int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
{
struct gb_svc_intf_device_id_request request;
request.intf_id = intf_id;
request.device_id = device_id;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
&request, sizeof(request), NULL, 0);
}
int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id)
{
struct gb_svc_intf_reset_request request;
request.intf_id = intf_id;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET,
&request, sizeof(request), NULL, 0);
}
EXPORT_SYMBOL_GPL(gb_svc_intf_reset);
int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
u32 *value)
{
struct gb_svc_dme_peer_get_request request;
struct gb_svc_dme_peer_get_response response;
u16 result;
int ret;
request.intf_id = intf_id;
request.attr = cpu_to_le16(attr);
request.selector = cpu_to_le16(selector);
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to get DME attribute (%hhu %hx %hu): %d\n",
intf_id, attr, selector, ret);
return ret;
}
result = le16_to_cpu(response.result_code);
if (result) {
dev_err(&svc->dev, "UniPro error while getting DME attribute (%hhu %hx %hu): %hu\n",
intf_id, attr, selector, result);
return -EINVAL;
}
if (value)
*value = le32_to_cpu(response.attr_value);
return 0;
}
EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get);
int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
u32 value)
{
struct gb_svc_dme_peer_set_request request;
struct gb_svc_dme_peer_set_response response;
u16 result;
int ret;
request.intf_id = intf_id;
request.attr = cpu_to_le16(attr);
request.selector = cpu_to_le16(selector);
request.value = cpu_to_le32(value);
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
&request, sizeof(request),
&response, sizeof(response));
if (ret) {
dev_err(&svc->dev, "failed to set DME attribute (%hhu %hx %hu %u): %d\n",
intf_id, attr, selector, value, ret);
return ret;
}
result = le16_to_cpu(response.result_code);
if (result) {
dev_err(&svc->dev, "UniPro error while setting DME attribute (%hhu %hx %hu %u): %hu\n",
intf_id, attr, selector, value, result);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set);
/*
* T_TstSrcIncrement is written by the module on ES2 as a stand-in for boot
* status attribute. 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_svc_read_and_clear_module_boot_status(struct gb_interface *intf)
{
struct gb_host_device *hd = intf->hd;
int ret;
u32 value;
/* Read and clear boot status in T_TstSrcIncrement */
ret = gb_svc_dme_peer_get(hd->svc, intf->interface_id,
DME_ATTR_T_TST_SRC_INCREMENT,
DME_ATTR_SELECTOR_INDEX, &value);
if (ret)
return ret;
/*
* A nonzero boot status indicates the module has finished
* booting. Clear it.
*/
if (!value) {
dev_err(&intf->dev, "Module not ready yet\n");
return -ENODEV;
}
/*
* Check if the module needs to boot from unipro.
* 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: Add code to find if we are on ES2 or ES3 to have separate
* checks.
*/
if (value == DME_TSI_UNIPRO_BOOT_STARTED ||
value == DME_TSI_FALLBACK_UNIPRO_BOOT_STARTED)
intf->boot_over_unipro = true;
return gb_svc_dme_peer_set(hd->svc, intf->interface_id,
DME_ATTR_T_TST_SRC_INCREMENT,
DME_ATTR_SELECTOR_INDEX, 0);
}
int gb_svc_connection_create(struct gb_svc *svc,
u8 intf1_id, u16 cport1_id,
u8 intf2_id, u16 cport2_id,
bool boot_over_unipro)
{
struct gb_svc_conn_create_request request;
request.intf1_id = intf1_id;
request.cport1_id = cpu_to_le16(cport1_id);
request.intf2_id = intf2_id;
request.cport2_id = cpu_to_le16(cport2_id);
/*
* XXX: fix connections paramaters to TC0 and all CPort flags
* for now.
*/
request.tc = 0;
/*
* We need to skip setting E2EFC and other flags to the connection
* create request, for all cports, on an interface that need to boot
* over unipro, i.e. interfaces required to download firmware.
*/
if (boot_over_unipro)
request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_CSD_N;
else
request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_E2EFC;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
&request, sizeof(request), NULL, 0);
}
EXPORT_SYMBOL_GPL(gb_svc_connection_create);
void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
u8 intf2_id, u16 cport2_id)
{
struct gb_svc_conn_destroy_request request;
struct gb_connection *connection = svc->connection;
int ret;
request.intf1_id = intf1_id;
request.cport1_id = cpu_to_le16(cport1_id);
request.intf2_id = intf2_id;
request.cport2_id = cpu_to_le16(cport2_id);
ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
&request, sizeof(request), NULL, 0);
if (ret) {
dev_err(&svc->dev, "failed to destroy connection (%hhu:%hu %hhu:%hu): %d\n",
intf1_id, cport1_id, intf2_id, cport2_id, ret);
}
}
EXPORT_SYMBOL_GPL(gb_svc_connection_destroy);
/* Creates bi-directional routes between the devices */
static int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
u8 intf2_id, u8 dev2_id)
{
struct gb_svc_route_create_request request;
request.intf1_id = intf1_id;
request.dev1_id = dev1_id;
request.intf2_id = intf2_id;
request.dev2_id = dev2_id;
return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
&request, sizeof(request), NULL, 0);
}
/* Destroys bi-directional routes between the devices */
static void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
{
struct gb_svc_route_destroy_request request;
int ret;
request.intf1_id = intf1_id;
request.intf2_id = intf2_id;
ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
&request, sizeof(request), NULL, 0);
if (ret) {
dev_err(&svc->dev, "failed to destroy route (%hhu %hhu): %d\n",
intf1_id, intf2_id, ret);
}
}
static int gb_svc_version_request(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = connection->private;
struct gb_protocol_version_request *request;
struct gb_protocol_version_response *response;
if (op->request->payload_size < sizeof(*request)) {
dev_err(&svc->dev, "short version request (%zu < %zu)\n",
op->request->payload_size,
sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
if (request->major > GB_SVC_VERSION_MAJOR) {
dev_warn(&svc->dev, "unsupported major version (%hhu > %hhu)\n",
request->major, GB_SVC_VERSION_MAJOR);
return -ENOTSUPP;
}
connection->module_major = request->major;
connection->module_minor = request->minor;
if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
return -ENOMEM;
response = op->response->payload;
response->major = connection->module_major;
response->minor = connection->module_minor;
return 0;
}
static int gb_svc_hello(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = connection->private;
struct gb_svc_hello_request *hello_request;
int ret;
if (op->request->payload_size < sizeof(*hello_request)) {
dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
op->request->payload_size,
sizeof(*hello_request));
return -EINVAL;
}
hello_request = op->request->payload;
svc->endo_id = le16_to_cpu(hello_request->endo_id);
svc->ap_intf_id = hello_request->interface_id;
ret = device_add(&svc->dev);
if (ret) {
dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
return ret;
}
return 0;
}
static void gb_svc_intf_remove(struct gb_svc *svc, struct gb_interface *intf)
{
u8 intf_id = intf->interface_id;
u8 device_id;
device_id = intf->device_id;
gb_interface_remove(intf);
/*
* Destroy the two-way route between the AP and the interface.
*/
gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id);
ida_simple_remove(&svc->device_id_map, device_id);
}
static void gb_svc_process_intf_hotplug(struct gb_operation *operation)
{
struct gb_svc_intf_hotplug_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = connection->private;
struct gb_host_device *hd = connection->hd;
struct gb_interface *intf;
u8 intf_id, device_id;
int ret;
/* The request message size has already been verified. */
request = operation->request->payload;
intf_id = request->intf_id;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id);
intf = gb_interface_find(hd, intf_id);
if (intf) {
/*
* We have received a hotplug request for an interface that
* already exists.
*
* This can happen in cases like:
* - bootrom loading the firmware image and booting into that,
* which only generates a hotplug event. i.e. no hot-unplug
* event.
* - Or the firmware on the module crashed and sent hotplug
* request again to the SVC, which got propagated to AP.
*
* Remove the interface and add it again, and let user know
* about this with a print message.
*/
dev_info(&svc->dev, "removing interface %hhu to add it again\n",
intf_id);
gb_svc_intf_remove(svc, intf);
}
intf = gb_interface_create(hd, intf_id);
if (!intf) {
dev_err(&svc->dev, "failed to create interface %hhu\n",
intf_id);
return;
}
ret = gb_svc_read_and_clear_module_boot_status(intf);
if (ret)
goto destroy_interface;
intf->unipro_mfg_id = le32_to_cpu(request->data.unipro_mfg_id);
intf->unipro_prod_id = le32_to_cpu(request->data.unipro_prod_id);
intf->vendor_id = le32_to_cpu(request->data.ara_vend_id);
intf->product_id = le32_to_cpu(request->data.ara_prod_id);
/*
* Create a device id for the interface:
* - device id 0 (GB_DEVICE_ID_SVC) belongs to the SVC
* - device id 1 (GB_DEVICE_ID_AP) belongs to the AP
*
* XXX Do we need to allocate device ID for SVC or the AP here? And what
* XXX about an AP with multiple interface blocks?
*/
device_id = ida_simple_get(&svc->device_id_map,
GB_DEVICE_ID_MODULES_START, 0, GFP_KERNEL);
if (device_id < 0) {
ret = device_id;
dev_err(&svc->dev, "failed to allocate device id for interface %hhu: %d\n",
intf_id, ret);
goto destroy_interface;
}
ret = gb_svc_intf_device_id(svc, intf_id, device_id);
if (ret) {
dev_err(&svc->dev, "failed to set device id %hhu for interface %hhu: %d\n",
device_id, intf_id, ret);
goto ida_put;
}
/*
* Create a two-way route between the AP and the new interface
*/
ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_DEVICE_ID_AP,
intf_id, device_id);
if (ret) {
dev_err(&svc->dev, "failed to create route to interface %hhu (device id %hhu): %d\n",
intf_id, device_id, ret);
goto svc_id_free;
}
ret = gb_interface_init(intf, device_id);
if (ret) {
dev_err(&svc->dev, "failed to initialize interface %hhu (device id %hhu): %d\n",
intf_id, device_id, ret);
goto destroy_route;
}
return;
destroy_route:
gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id);
svc_id_free:
/*
* XXX Should we tell SVC that this id doesn't belong to interface
* XXX anymore.
*/
ida_put:
ida_simple_remove(&svc->device_id_map, device_id);
destroy_interface:
gb_interface_remove(intf);
}
static void gb_svc_process_intf_hot_unplug(struct gb_operation *operation)
{
struct gb_svc *svc = operation->connection->private;
struct gb_svc_intf_hot_unplug_request *request;
struct gb_host_device *hd = operation->connection->hd;
struct gb_interface *intf;
u8 intf_id;
/* The request message size has already been verified. */
request = operation->request->payload;
intf_id = request->intf_id;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id);
intf = gb_interface_find(hd, intf_id);
if (!intf) {
dev_warn(&svc->dev, "could not find hot-unplug interface %hhu\n",
intf_id);
return;
}
gb_svc_intf_remove(svc, intf);
}
static void gb_svc_process_deferred_request(struct work_struct *work)
{
struct gb_svc_deferred_request *dr;
struct gb_operation *operation;
struct gb_svc *svc;
u8 type;
dr = container_of(work, struct gb_svc_deferred_request, work);
operation = dr->operation;
svc = operation->connection->private;
type = operation->request->header->type;
switch (type) {
case GB_SVC_TYPE_INTF_HOTPLUG:
gb_svc_process_intf_hotplug(operation);
break;
case GB_SVC_TYPE_INTF_HOT_UNPLUG:
gb_svc_process_intf_hot_unplug(operation);
break;
default:
dev_err(&svc->dev, "bad deferred request type: %02x\n", type);
}
gb_operation_put(operation);
kfree(dr);
}
static int gb_svc_queue_deferred_request(struct gb_operation *operation)
{
struct gb_svc *svc = operation->connection->private;
struct gb_svc_deferred_request *dr;
dr = kmalloc(sizeof(*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
gb_operation_get(operation);
dr->operation = operation;
INIT_WORK(&dr->work, gb_svc_process_deferred_request);
queue_work(svc->wq, &dr->work);
return 0;
}
/*
* Bringing up a module can be time consuming, as that may require lots of
* initialization on the module side. Over that, we may also need to download
* the firmware first and flash that on the module.
*
* In order not to make other svc events wait for all this to finish,
* handle most of module hotplug stuff outside of the hotplug callback, with
* help of a workqueue.
*/
static int gb_svc_intf_hotplug_recv(struct gb_operation *op)
{
struct gb_svc *svc = op->connection->private;
struct gb_svc_intf_hotplug_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short hotplug request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op)
{
struct gb_svc *svc = op->connection->private;
struct gb_svc_intf_hot_unplug_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short hot unplug request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_intf_reset_recv(struct gb_operation *op)
{
struct gb_svc *svc = op->connection->private;
struct gb_message *request = op->request;
struct gb_svc_intf_reset_request *reset;
u8 intf_id;
if (request->payload_size < sizeof(*reset)) {
dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
request->payload_size, sizeof(*reset));
return -EINVAL;
}
reset = request->payload;
intf_id = reset->intf_id;
/* FIXME Reset the interface here */
return 0;
}
static int gb_svc_request_recv(u8 type, struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_svc *svc = connection->private;
int ret = 0;
/*
* SVC requests need to follow a specific order (at least initially) and
* below code takes care of enforcing that. The expected order is:
* - PROTOCOL_VERSION
* - SVC_HELLO
* - Any other request, but the earlier two.
*
* Incoming requests are guaranteed to be serialized and so we don't
* need to protect 'state' for any races.
*/
switch (type) {
case GB_REQUEST_TYPE_PROTOCOL_VERSION:
if (svc->state != GB_SVC_STATE_RESET)
ret = -EINVAL;
break;
case GB_SVC_TYPE_SVC_HELLO:
if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
ret = -EINVAL;
break;
default:
if (svc->state != GB_SVC_STATE_SVC_HELLO)
ret = -EINVAL;
break;
}
if (ret) {
dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
type, svc->state);
return ret;
}
switch (type) {
case GB_REQUEST_TYPE_PROTOCOL_VERSION:
ret = gb_svc_version_request(op);
if (!ret)
svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
return ret;
case GB_SVC_TYPE_SVC_HELLO:
ret = gb_svc_hello(op);
if (!ret)
svc->state = GB_SVC_STATE_SVC_HELLO;
return ret;
case GB_SVC_TYPE_INTF_HOTPLUG:
return gb_svc_intf_hotplug_recv(op);
case GB_SVC_TYPE_INTF_HOT_UNPLUG:
return gb_svc_intf_hot_unplug_recv(op);
case GB_SVC_TYPE_INTF_RESET:
return gb_svc_intf_reset_recv(op);
default:
dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
return -EINVAL;
}
}
static void gb_svc_release(struct device *dev)
{
struct gb_svc *svc = to_gb_svc(dev);
ida_destroy(&svc->device_id_map);
destroy_workqueue(svc->wq);
kfree(svc);
}
struct device_type greybus_svc_type = {
.name = "greybus_svc",
.release = gb_svc_release,
};
static int gb_svc_connection_init(struct gb_connection *connection)
{
struct gb_host_device *hd = connection->hd;
struct gb_svc *svc;
svc = kzalloc(sizeof(*svc), GFP_KERNEL);
if (!svc)
return -ENOMEM;
svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
if (!svc->wq) {
kfree(svc);
return -ENOMEM;
}
svc->dev.parent = &hd->dev;
svc->dev.bus = &greybus_bus_type;
svc->dev.type = &greybus_svc_type;
svc->dev.groups = svc_groups;
svc->dev.dma_mask = svc->dev.parent->dma_mask;
device_initialize(&svc->dev);
dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
ida_init(&svc->device_id_map);
svc->state = GB_SVC_STATE_RESET;
svc->connection = connection;
connection->private = svc;
hd->svc = svc;
return 0;
}
static void gb_svc_connection_exit(struct gb_connection *connection)
{
struct gb_svc *svc = connection->private;
if (device_is_registered(&svc->dev))
device_del(&svc->dev);
flush_workqueue(svc->wq);
connection->hd->svc = NULL;
connection->private = NULL;
put_device(&svc->dev);
}
static struct gb_protocol svc_protocol = {
.name = "svc",
.id = GREYBUS_PROTOCOL_SVC,
.major = GB_SVC_VERSION_MAJOR,
.minor = GB_SVC_VERSION_MINOR,
.connection_init = gb_svc_connection_init,
.connection_exit = gb_svc_connection_exit,
.request_recv = gb_svc_request_recv,
.flags = GB_PROTOCOL_SKIP_CONTROL_CONNECTED |
GB_PROTOCOL_SKIP_CONTROL_DISCONNECTED |
GB_PROTOCOL_SKIP_VERSION,
};
gb_builtin_protocol_driver(svc_protocol);
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