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/*
* Greybus Firmware Core Bundle Driver.
*
* Copyright 2016 Google Inc.
* Copyright 2016 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/firmware.h>
#include "firmware.h"
#include "greybus.h"
#include "spilib.h"
struct gb_fw_core {
struct gb_connection *download_connection;
struct gb_connection *mgmt_connection;
struct gb_connection *spi_connection;
};
struct gb_connection *to_fw_mgmt_connection(struct device *dev)
{
struct gb_fw_core *fw_core = dev_get_drvdata(dev);
return fw_core->mgmt_connection;
}
static int gb_fw_spi_connection_init(struct gb_connection *connection)
{
int ret;
if (!connection)
return 0;
ret = gb_connection_enable(connection);
if (ret)
return ret;
ret = gb_spilib_master_init(connection, &connection->bundle->dev);
if (ret) {
gb_connection_disable(connection);
return ret;
}
return 0;
}
static void gb_fw_spi_connection_exit(struct gb_connection *connection)
{
if (!connection)
return;
gb_spilib_master_exit(connection);
gb_connection_disable(connection);
}
static int gb_fw_core_probe(struct gb_bundle *bundle,
const struct greybus_bundle_id *id)
{
struct greybus_descriptor_cport *cport_desc;
struct gb_connection *connection;
struct gb_fw_core *fw_core;
int ret, i;
u16 cport_id;
u8 protocol_id;
fw_core = kzalloc(sizeof(*fw_core), GFP_KERNEL);
if (!fw_core)
return -ENOMEM;
/* Parse CPorts and create connections */
for (i = 0; i < bundle->num_cports; i++) {
cport_desc = &bundle->cport_desc[i];
cport_id = le16_to_cpu(cport_desc->id);
protocol_id = cport_desc->protocol_id;
switch (protocol_id) {
case GREYBUS_PROTOCOL_FW_MANAGEMENT:
/* Disallow multiple Firmware Management CPorts */
if (fw_core->mgmt_connection) {
dev_err(&bundle->dev,
"multiple management CPorts found\n");
ret = -EINVAL;
goto err_destroy_connections;
}
connection = gb_connection_create(bundle, cport_id,
gb_fw_mgmt_request_handler);
if (IS_ERR(connection)) {
ret = PTR_ERR(connection);
dev_err(&bundle->dev,
"failed to create management connection (%d)\n",
ret);
goto err_destroy_connections;
}
fw_core->mgmt_connection = connection;
break;
case GREYBUS_PROTOCOL_FW_DOWNLOAD:
/* Disallow multiple Firmware Download CPorts */
if (fw_core->download_connection) {
dev_err(&bundle->dev,
"multiple download CPorts found\n");
ret = -EINVAL;
goto err_destroy_connections;
}
connection = gb_connection_create(bundle, cport_id,
gb_fw_download_request_handler);
if (IS_ERR(connection)) {
dev_err(&bundle->dev, "failed to create download connection (%ld)\n",
PTR_ERR(connection));
} else {
fw_core->download_connection = connection;
}
break;
case GREYBUS_PROTOCOL_SPI:
/* Disallow multiple SPI CPorts */
if (fw_core->spi_connection) {
dev_err(&bundle->dev,
"multiple SPI CPorts found\n");
ret = -EINVAL;
goto err_destroy_connections;
}
connection = gb_connection_create(bundle, cport_id,
NULL);
if (IS_ERR(connection)) {
dev_err(&bundle->dev, "failed to create SPI connection (%ld)\n",
PTR_ERR(connection));
} else {
fw_core->spi_connection = connection;
}
break;
default:
dev_err(&bundle->dev, "invalid protocol id (0x%02x)\n",
protocol_id);
ret = -EINVAL;
goto err_destroy_connections;
}
}
/* Firmware Management connection is mandatory */
if (!fw_core->mgmt_connection) {
dev_err(&bundle->dev, "missing management connection\n");
ret = -ENODEV;
goto err_destroy_connections;
}
ret = gb_fw_download_connection_init(fw_core->download_connection);
if (ret) {
/* We may still be able to work with the Interface */
dev_err(&bundle->dev, "failed to initialize firmware download connection, disable it (%d)\n",
ret);
gb_connection_destroy(fw_core->download_connection);
fw_core->download_connection = NULL;
}
ret = gb_fw_spi_connection_init(fw_core->spi_connection);
if (ret) {
/* We may still be able to work with the Interface */
dev_err(&bundle->dev, "failed to initialize SPI connection, disable it (%d)\n",
ret);
gb_connection_destroy(fw_core->spi_connection);
fw_core->spi_connection = NULL;
}
ret = gb_fw_mgmt_connection_init(fw_core->mgmt_connection);
if (ret) {
/* We may still be able to work with the Interface */
dev_err(&bundle->dev, "failed to initialize firmware management connection, disable it (%d)\n",
ret);
goto err_exit_connections;
}
greybus_set_drvdata(bundle, fw_core);
return 0;
err_exit_connections:
gb_fw_spi_connection_exit(fw_core->spi_connection);
gb_fw_download_connection_exit(fw_core->download_connection);
err_destroy_connections:
gb_connection_destroy(fw_core->mgmt_connection);
gb_connection_destroy(fw_core->spi_connection);
gb_connection_destroy(fw_core->download_connection);
kfree(fw_core);
return ret;
}
static void gb_fw_core_disconnect(struct gb_bundle *bundle)
{
struct gb_fw_core *fw_core = greybus_get_drvdata(bundle);
gb_fw_mgmt_connection_exit(fw_core->mgmt_connection);
gb_fw_spi_connection_exit(fw_core->spi_connection);
gb_fw_download_connection_exit(fw_core->download_connection);
gb_connection_destroy(fw_core->mgmt_connection);
gb_connection_destroy(fw_core->spi_connection);
gb_connection_destroy(fw_core->download_connection);
kfree(fw_core);
}
static const struct greybus_bundle_id gb_fw_core_id_table[] = {
{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_FW_MANAGEMENT) },
{ }
};
static struct greybus_driver gb_fw_core_driver = {
.name = "gb-firmware",
.probe = gb_fw_core_probe,
.disconnect = gb_fw_core_disconnect,
.id_table = gb_fw_core_id_table,
};
static int fw_core_init(void)
{
int ret;
ret = fw_mgmt_init();
if (ret) {
pr_err("Failed to initialize fw-mgmt core (%d)\n", ret);
return ret;
}
ret = greybus_register(&gb_fw_core_driver);
if (ret) {
fw_mgmt_exit();
return ret;
}
return 0;
}
module_init(fw_core_init);
static void __exit fw_core_exit(void)
{
greybus_deregister(&gb_fw_core_driver);
fw_mgmt_exit();
}
module_exit(fw_core_exit);
MODULE_ALIAS("greybus:firmware");
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
MODULE_DESCRIPTION("Greybus Firmware Bundle Driver");
MODULE_LICENSE("GPL v2");
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