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https://github.com/AsahiLinux/u-boot
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Sandbox supports block devices which can access files on the host machine. At present there is no uclass for this. The devices are attached to the root devic. The block-device type is therefore set to UCLASS_ROOT which is confusing. Block devices should be attached to a 'media' device instead, something which handles access to the actual media and provides the block driver for the block device. Create a new uclass to handle this. It supports two operations, to attach and detach a file on the host machine. For now this is not fully plumbed in. Signed-off-by: Simon Glass <sjg@chromium.org>
176 lines
3.3 KiB
C
176 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Uclass for sandbox host interface, used to access files on the host which
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* contain partitions and filesystem
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*
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* Copyright 2022 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_HOST
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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <malloc.h>
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#include <sandbox_host.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/uclass-internal.h>
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* struct host_priv - information kept by the host uclass
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*
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* @cur_dev: Currently selected host device, or NULL if none
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*/
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struct host_priv {
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struct udevice *cur_dev;
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};
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int host_create_device(const char *label, bool removable, struct udevice **devp)
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{
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char dev_name[30], *str, *label_new;
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struct host_sb_plat *plat;
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struct udevice *dev, *blk;
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int ret;
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/* unbind any existing device with this label */
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dev = host_find_by_label(label);
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if (dev) {
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ret = host_detach_file(dev);
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if (ret)
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return log_msg_ret("det", ret);
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ret = device_unbind(dev);
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if (ret)
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return log_msg_ret("unb", ret);
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}
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snprintf(dev_name, sizeof(dev_name), "host-%s", label);
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str = strdup(dev_name);
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if (!str)
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return -ENOMEM;
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label_new = strdup(label);
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if (!label_new) {
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ret = -ENOMEM;
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goto no_label;
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}
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ret = device_bind_driver(gd->dm_root, "host_sb_drv", str, &dev);
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if (ret)
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goto no_dev;
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device_set_name_alloced(dev);
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if (!blk_find_from_parent(dev, &blk)) {
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struct blk_desc *desc = dev_get_uclass_plat(blk);
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desc->removable = removable;
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}
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plat = dev_get_plat(dev);
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plat->label = label_new;
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*devp = dev;
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return 0;
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no_dev:
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free(label_new);
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no_label:
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free(str);
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return ret;
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}
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int host_attach_file(struct udevice *dev, const char *filename)
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{
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struct host_ops *ops = host_get_ops(dev);
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if (!ops->attach_file)
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return -ENOSYS;
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return ops->attach_file(dev, filename);
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}
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int host_create_attach_file(const char *label, const char *filename,
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bool removable, struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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ret = host_create_device(label, removable, &dev);
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if (ret)
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return log_msg_ret("cre", ret);
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ret = host_attach_file(dev, filename);
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if (ret) {
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device_unbind(dev);
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return log_msg_ret("att", ret);
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}
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*devp = dev;
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return 0;
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}
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int host_detach_file(struct udevice *dev)
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{
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struct host_ops *ops = host_get_ops(dev);
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if (!ops->detach_file)
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return -ENOSYS;
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if (dev == host_get_cur_dev())
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host_set_cur_dev(NULL);
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return ops->detach_file(dev);
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}
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struct udevice *host_find_by_label(const char *label)
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{
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struct udevice *dev;
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struct uclass *uc;
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uclass_id_foreach_dev(UCLASS_HOST, dev, uc) {
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struct host_sb_plat *plat = dev_get_plat(dev);
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if (plat->label && !strcmp(label, plat->label))
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return dev;
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}
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return NULL;
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}
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struct udevice *host_get_cur_dev(void)
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{
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struct uclass *uc = uclass_find(UCLASS_HOST);
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if (uc) {
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struct host_priv *priv = uclass_get_priv(uc);
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return priv->cur_dev;
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}
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return NULL;
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}
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void host_set_cur_dev(struct udevice *dev)
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{
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struct uclass *uc = uclass_find(UCLASS_HOST);
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if (uc) {
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struct host_priv *priv = uclass_get_priv(uc);
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priv->cur_dev = dev;
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}
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}
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UCLASS_DRIVER(host) = {
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.id = UCLASS_HOST,
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.name = "host",
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#if CONFIG_IS_ENABLED(OF_REAL)
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.post_bind = dm_scan_fdt_dev,
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#endif
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.priv_auto = sizeof(struct host_priv),
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};
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