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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
No need to support older kernel versions in the Greybus SPI and spilib driver, so remove the checks as needed, we can now rely on all of the correct SPI core apis being present. Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
312 lines
7.9 KiB
C
312 lines
7.9 KiB
C
/*
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* Greybus Firmware Core Bundle Driver.
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*
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* Copyright 2016 Google Inc.
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* Copyright 2016 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/firmware.h>
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#include "firmware.h"
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#include "greybus.h"
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#include "spilib.h"
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struct gb_fw_core {
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struct gb_connection *download_connection;
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struct gb_connection *mgmt_connection;
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struct gb_connection *spi_connection;
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struct gb_connection *cap_connection;
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};
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static struct spilib_ops *spilib_ops;
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struct gb_connection *to_fw_mgmt_connection(struct device *dev)
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{
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struct gb_fw_core *fw_core = dev_get_drvdata(dev);
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return fw_core->mgmt_connection;
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}
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static int gb_fw_spi_connection_init(struct gb_connection *connection)
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{
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int ret;
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if (!connection)
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return 0;
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ret = gb_connection_enable(connection);
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if (ret)
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return ret;
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ret = gb_spilib_master_init(connection, &connection->bundle->dev,
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spilib_ops);
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if (ret) {
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gb_connection_disable(connection);
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return ret;
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}
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return 0;
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}
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static void gb_fw_spi_connection_exit(struct gb_connection *connection)
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{
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if (!connection)
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return;
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gb_spilib_master_exit(connection);
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gb_connection_disable(connection);
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}
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static int gb_fw_core_probe(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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struct greybus_descriptor_cport *cport_desc;
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struct gb_connection *connection;
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struct gb_fw_core *fw_core;
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int ret, i;
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u16 cport_id;
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u8 protocol_id;
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fw_core = kzalloc(sizeof(*fw_core), GFP_KERNEL);
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if (!fw_core)
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return -ENOMEM;
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/* Parse CPorts and create connections */
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for (i = 0; i < bundle->num_cports; i++) {
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cport_desc = &bundle->cport_desc[i];
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cport_id = le16_to_cpu(cport_desc->id);
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protocol_id = cport_desc->protocol_id;
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switch (protocol_id) {
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case GREYBUS_PROTOCOL_FW_MANAGEMENT:
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/* Disallow multiple Firmware Management CPorts */
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if (fw_core->mgmt_connection) {
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dev_err(&bundle->dev,
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"multiple management CPorts found\n");
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ret = -EINVAL;
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goto err_destroy_connections;
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}
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connection = gb_connection_create(bundle, cport_id,
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gb_fw_mgmt_request_handler);
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if (IS_ERR(connection)) {
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ret = PTR_ERR(connection);
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dev_err(&bundle->dev,
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"failed to create management connection (%d)\n",
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ret);
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goto err_destroy_connections;
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}
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fw_core->mgmt_connection = connection;
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break;
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case GREYBUS_PROTOCOL_FW_DOWNLOAD:
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/* Disallow multiple Firmware Download CPorts */
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if (fw_core->download_connection) {
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dev_err(&bundle->dev,
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"multiple download CPorts found\n");
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ret = -EINVAL;
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goto err_destroy_connections;
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}
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connection = gb_connection_create(bundle, cport_id,
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gb_fw_download_request_handler);
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if (IS_ERR(connection)) {
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dev_err(&bundle->dev, "failed to create download connection (%ld)\n",
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PTR_ERR(connection));
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} else {
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fw_core->download_connection = connection;
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}
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break;
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case GREYBUS_PROTOCOL_SPI:
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/* Disallow multiple SPI CPorts */
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if (fw_core->spi_connection) {
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dev_err(&bundle->dev,
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"multiple SPI CPorts found\n");
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ret = -EINVAL;
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goto err_destroy_connections;
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}
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connection = gb_connection_create(bundle, cport_id,
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NULL);
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if (IS_ERR(connection)) {
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dev_err(&bundle->dev, "failed to create SPI connection (%ld)\n",
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PTR_ERR(connection));
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} else {
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fw_core->spi_connection = connection;
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}
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break;
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case GREYBUS_PROTOCOL_AUTHENTICATION:
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/* Disallow multiple CAP CPorts */
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if (fw_core->cap_connection) {
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dev_err(&bundle->dev, "multiple Authentication CPorts found\n");
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ret = -EINVAL;
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goto err_destroy_connections;
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}
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connection = gb_connection_create(bundle, cport_id,
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NULL);
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if (IS_ERR(connection)) {
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dev_err(&bundle->dev, "failed to create Authentication connection (%ld)\n",
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PTR_ERR(connection));
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} else {
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fw_core->cap_connection = connection;
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}
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break;
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default:
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dev_err(&bundle->dev, "invalid protocol id (0x%02x)\n",
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protocol_id);
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ret = -EINVAL;
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goto err_destroy_connections;
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}
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}
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/* Firmware Management connection is mandatory */
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if (!fw_core->mgmt_connection) {
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dev_err(&bundle->dev, "missing management connection\n");
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ret = -ENODEV;
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goto err_destroy_connections;
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}
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ret = gb_fw_download_connection_init(fw_core->download_connection);
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if (ret) {
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/* We may still be able to work with the Interface */
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dev_err(&bundle->dev, "failed to initialize firmware download connection, disable it (%d)\n",
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ret);
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gb_connection_destroy(fw_core->download_connection);
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fw_core->download_connection = NULL;
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}
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ret = gb_fw_spi_connection_init(fw_core->spi_connection);
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if (ret) {
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/* We may still be able to work with the Interface */
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dev_err(&bundle->dev, "failed to initialize SPI connection, disable it (%d)\n",
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ret);
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gb_connection_destroy(fw_core->spi_connection);
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fw_core->spi_connection = NULL;
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}
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ret = gb_cap_connection_init(fw_core->cap_connection);
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if (ret) {
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/* We may still be able to work with the Interface */
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dev_err(&bundle->dev, "failed to initialize CAP connection, disable it (%d)\n",
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ret);
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gb_connection_destroy(fw_core->cap_connection);
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fw_core->cap_connection = NULL;
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}
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ret = gb_fw_mgmt_connection_init(fw_core->mgmt_connection);
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if (ret) {
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/* We may still be able to work with the Interface */
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dev_err(&bundle->dev, "failed to initialize firmware management connection, disable it (%d)\n",
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ret);
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goto err_exit_connections;
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}
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greybus_set_drvdata(bundle, fw_core);
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/* FIXME: Remove this after S2 Loader gets runtime PM support */
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if (!(bundle->intf->quirks & GB_INTERFACE_QUIRK_NO_PM))
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gb_pm_runtime_put_autosuspend(bundle);
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return 0;
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err_exit_connections:
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gb_cap_connection_exit(fw_core->cap_connection);
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gb_fw_spi_connection_exit(fw_core->spi_connection);
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gb_fw_download_connection_exit(fw_core->download_connection);
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err_destroy_connections:
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gb_connection_destroy(fw_core->mgmt_connection);
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gb_connection_destroy(fw_core->cap_connection);
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gb_connection_destroy(fw_core->spi_connection);
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gb_connection_destroy(fw_core->download_connection);
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kfree(fw_core);
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return ret;
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}
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static void gb_fw_core_disconnect(struct gb_bundle *bundle)
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{
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struct gb_fw_core *fw_core = greybus_get_drvdata(bundle);
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int ret;
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/* FIXME: Remove this after S2 Loader gets runtime PM support */
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if (!(bundle->intf->quirks & GB_INTERFACE_QUIRK_NO_PM)) {
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ret = gb_pm_runtime_get_sync(bundle);
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if (ret)
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gb_pm_runtime_get_noresume(bundle);
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}
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gb_fw_mgmt_connection_exit(fw_core->mgmt_connection);
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gb_cap_connection_exit(fw_core->cap_connection);
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gb_fw_spi_connection_exit(fw_core->spi_connection);
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gb_fw_download_connection_exit(fw_core->download_connection);
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gb_connection_destroy(fw_core->mgmt_connection);
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gb_connection_destroy(fw_core->cap_connection);
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gb_connection_destroy(fw_core->spi_connection);
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gb_connection_destroy(fw_core->download_connection);
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kfree(fw_core);
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}
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static const struct greybus_bundle_id gb_fw_core_id_table[] = {
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_FW_MANAGEMENT) },
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{ }
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};
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static struct greybus_driver gb_fw_core_driver = {
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.name = "gb-firmware",
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.probe = gb_fw_core_probe,
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.disconnect = gb_fw_core_disconnect,
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.id_table = gb_fw_core_id_table,
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};
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static int fw_core_init(void)
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{
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int ret;
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ret = fw_mgmt_init();
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if (ret) {
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pr_err("Failed to initialize fw-mgmt core (%d)\n", ret);
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return ret;
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}
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ret = cap_init();
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if (ret) {
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pr_err("Failed to initialize component authentication core (%d)\n",
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ret);
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goto fw_mgmt_exit;
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}
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ret = greybus_register(&gb_fw_core_driver);
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if (ret)
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goto cap_exit;
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return 0;
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cap_exit:
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cap_exit();
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fw_mgmt_exit:
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fw_mgmt_exit();
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return ret;
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}
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module_init(fw_core_init);
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static void __exit fw_core_exit(void)
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{
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greybus_deregister(&gb_fw_core_driver);
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cap_exit();
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fw_mgmt_exit();
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}
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module_exit(fw_core_exit);
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MODULE_ALIAS("greybus:firmware");
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MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
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MODULE_DESCRIPTION("Greybus Firmware Bundle Driver");
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MODULE_LICENSE("GPL v2");
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