bootstd: Add the bootdev uclass
A 'bootdev' is a device which can be used to boot an operating system. It is a child of the media device (e.g. MMC) which handles reading files from that device, such as a bootflow file. Add a uclass for bootdev and the various helpers needed to make it work. Also add a binding file, empty for now. Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
Tom Rini
parent
ef5e3891f5
commit
201417d700
@ -696,9 +696,11 @@ F: tools/binman/
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BOOTDEVICE
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BOOTDEVICE
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M: Simon Glass <sjg@chromium.org>
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M: Simon Glass <sjg@chromium.org>
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S: Maintained
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S: Maintained
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F: boot/bootdev*.c
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F: boot/bootstd.c
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F: boot/bootstd.c
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F: include/bootstd.h
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F: include/bootdev*.h
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F: include/bootflow.h
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F: include/bootflow.h
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F: include/bootstd.h
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BTRFS
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BTRFS
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M: Marek Behun <marek.behun@nic.cz>
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M: Marek Behun <marek.behun@nic.cz>
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@ -19,6 +19,7 @@ obj-y += image.o image-board.o
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obj-$(CONFIG_ANDROID_AB) += android_ab.o
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obj-$(CONFIG_ANDROID_AB) += android_ab.o
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obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o image-android-dt.o
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obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o image-android-dt.o
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obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootdev-uclass.o
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obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootstd-uclass.o
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obj-$(CONFIG_$(SPL_TPL_)BOOTSTD) += bootstd-uclass.o
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obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o
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obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o
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640
boot/bootdev-uclass.c
Normal file
640
boot/bootdev-uclass.c
Normal file
@ -0,0 +1,640 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2021 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_BOOTSTD
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#include <common.h>
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#include <dm.h>
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#include <bootdev.h>
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#include <bootflow.h>
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#include <bootstd.h>
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#include <env.h>
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#include <fs.h>
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#include <log.h>
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#include <malloc.h>
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#include <part.h>
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#include <sort.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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enum {
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/*
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* Set some sort of limit on the number of partitions a bootdev can
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* have. Note that for disks this limits the partitions numbers that
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* are scanned to 1..MAX_BOOTFLOWS_PER_BOOTDEV
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*/
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MAX_PART_PER_BOOTDEV = 30,
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/* Maximum supported length of the "boot_targets" env string */
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BOOT_TARGETS_MAX_LEN = 100,
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};
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int bootdev_add_bootflow(struct bootflow *bflow)
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{
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struct bootdev_uc_plat *ucp = dev_get_uclass_plat(bflow->dev);
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struct bootstd_priv *std;
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struct bootflow *new;
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int ret;
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assert(bflow->dev);
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ret = bootstd_get_priv(&std);
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if (ret)
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return ret;
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new = malloc(sizeof(*bflow));
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if (!new)
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return log_msg_ret("bflow", -ENOMEM);
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memcpy(new, bflow, sizeof(*bflow));
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list_add_tail(&new->glob_node, &std->glob_head);
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list_add_tail(&new->bm_node, &ucp->bootflow_head);
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return 0;
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}
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int bootdev_first_bootflow(struct udevice *dev, struct bootflow **bflowp)
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{
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struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
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if (list_empty(&ucp->bootflow_head))
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return -ENOENT;
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*bflowp = list_first_entry(&ucp->bootflow_head, struct bootflow,
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bm_node);
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return 0;
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}
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int bootdev_next_bootflow(struct bootflow **bflowp)
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{
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struct bootflow *bflow = *bflowp;
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struct bootdev_uc_plat *ucp = dev_get_uclass_plat(bflow->dev);
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*bflowp = NULL;
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if (list_is_last(&bflow->bm_node, &ucp->bootflow_head))
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return -ENOENT;
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*bflowp = list_entry(bflow->bm_node.next, struct bootflow, bm_node);
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return 0;
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}
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int bootdev_bind(struct udevice *parent, const char *drv_name, const char *name,
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struct udevice **devp)
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{
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struct udevice *dev;
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char dev_name[30];
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char *str;
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int ret;
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snprintf(dev_name, sizeof(dev_name), "%s.%s", parent->name, name);
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str = strdup(dev_name);
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if (!str)
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return -ENOMEM;
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ret = device_bind_driver(parent, drv_name, str, &dev);
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if (ret)
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return ret;
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device_set_name_alloced(dev);
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*devp = dev;
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return 0;
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}
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int bootdev_find_in_blk(struct udevice *dev, struct udevice *blk,
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struct bootflow_iter *iter, struct bootflow *bflow)
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{
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struct blk_desc *desc = dev_get_uclass_plat(blk);
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struct disk_partition info;
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char partstr[20];
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char name[60];
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int ret;
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/* Sanity check */
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if (iter->part >= MAX_PART_PER_BOOTDEV)
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return log_msg_ret("max", -ESHUTDOWN);
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bflow->blk = blk;
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if (iter->part)
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snprintf(partstr, sizeof(partstr), "part_%x", iter->part);
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else
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strcpy(partstr, "whole");
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snprintf(name, sizeof(name), "%s.%s", dev->name, partstr);
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bflow->name = strdup(name);
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if (!bflow->name)
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return log_msg_ret("name", -ENOMEM);
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bflow->part = iter->part;
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/*
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* partition numbers start at 0 so this cannot succeed, but it can tell
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* us whether there is valid media there
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*/
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ret = part_get_info(desc, iter->part, &info);
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if (!iter->part && ret == -ENOENT)
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ret = 0;
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/*
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* This error indicates the media is not present. Otherwise we just
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* blindly scan the next partition. We could be more intelligent here
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* and check which partition numbers actually exist.
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*/
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if (ret == -EOPNOTSUPP)
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ret = -ESHUTDOWN;
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else
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bflow->state = BOOTFLOWST_MEDIA;
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if (ret)
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return log_msg_ret("part", ret);
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/*
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* Currently we don't get the number of partitions, so just
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* assume a large number
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*/
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iter->max_part = MAX_PART_PER_BOOTDEV;
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if (iter->part) {
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ret = fs_set_blk_dev_with_part(desc, bflow->part);
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bflow->state = BOOTFLOWST_PART;
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/* Use an #ifdef due to info.sys_ind */
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#ifdef CONFIG_DOS_PARTITION
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log_debug("%s: Found partition %x type %x fstype %d\n",
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blk->name, bflow->part, info.sys_ind,
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ret ? -1 : fs_get_type());
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#endif
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if (ret)
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return log_msg_ret("fs", ret);
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bflow->state = BOOTFLOWST_FS;
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}
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return 0;
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}
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void bootdev_list(bool probe)
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{
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struct udevice *dev;
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int ret;
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int i;
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printf("Seq Probed Status Uclass Name\n");
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printf("--- ------ ------ -------- ------------------\n");
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if (probe)
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ret = uclass_first_device_err(UCLASS_BOOTDEV, &dev);
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else
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ret = uclass_find_first_device(UCLASS_BOOTDEV, &dev);
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for (i = 0; dev; i++) {
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printf("%3x [ %c ] %6s %-9.9s %s\n", dev_seq(dev),
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device_active(dev) ? '+' : ' ',
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ret ? simple_itoa(ret) : "OK",
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dev_get_uclass_name(dev_get_parent(dev)), dev->name);
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if (probe)
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ret = uclass_next_device_err(&dev);
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else
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ret = uclass_find_next_device(&dev);
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}
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printf("--- ------ ------ -------- ------------------\n");
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printf("(%d bootdev%s)\n", i, i != 1 ? "s" : "");
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}
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int bootdev_setup_for_dev(struct udevice *parent, const char *drv_name)
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{
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struct udevice *bdev;
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int ret;
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ret = device_find_first_child_by_uclass(parent, UCLASS_BOOTDEV,
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&bdev);
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if (ret) {
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if (ret != -ENODEV) {
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log_debug("Cannot access bootdev device\n");
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return ret;
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}
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ret = bootdev_bind(parent, drv_name, "bootdev", &bdev);
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if (ret) {
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log_debug("Cannot create bootdev device\n");
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return ret;
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}
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}
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return 0;
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}
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int bootdev_setup_sibling_blk(struct udevice *blk, const char *drv_name)
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{
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struct udevice *parent, *dev;
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char dev_name[50];
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int ret;
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snprintf(dev_name, sizeof(dev_name), "%s.%s", blk->name, "bootdev");
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parent = dev_get_parent(blk);
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ret = device_find_child_by_name(parent, dev_name, &dev);
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if (ret) {
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char *str;
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if (ret != -ENODEV) {
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log_debug("Cannot access bootdev device\n");
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return ret;
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}
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str = strdup(dev_name);
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if (!str)
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return -ENOMEM;
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ret = device_bind_driver(parent, drv_name, str, &dev);
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if (ret) {
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log_debug("Cannot create bootdev device\n");
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return ret;
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}
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device_set_name_alloced(dev);
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}
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return 0;
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}
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int bootdev_get_sibling_blk(struct udevice *dev, struct udevice **blkp)
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{
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struct udevice *parent = dev_get_parent(dev);
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struct udevice *blk;
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int ret, len;
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char *p;
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if (device_get_uclass_id(dev) != UCLASS_BOOTDEV)
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return -EINVAL;
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/* This should always work if bootdev_setup_sibling_blk() was used */
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p = strstr(dev->name, ".bootdev");
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if (!p)
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return log_msg_ret("str", -EINVAL);
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len = p - dev->name;
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ret = device_find_child_by_namelen(parent, dev->name, len, &blk);
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if (ret)
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return log_msg_ret("find", ret);
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*blkp = blk;
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return 0;
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}
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static int bootdev_get_from_blk(struct udevice *blk, struct udevice **bootdevp)
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{
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struct udevice *parent = dev_get_parent(blk);
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struct udevice *bootdev;
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char dev_name[50];
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int ret;
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if (device_get_uclass_id(blk) != UCLASS_BLK)
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return -EINVAL;
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/* This should always work if bootdev_setup_sibling_blk() was used */
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snprintf(dev_name, sizeof(dev_name), "%s.%s", blk->name, "bootdev");
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ret = device_find_child_by_name(parent, dev_name, &bootdev);
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if (ret)
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return log_msg_ret("find", ret);
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*bootdevp = bootdev;
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return 0;
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}
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int bootdev_unbind_dev(struct udevice *parent)
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{
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struct udevice *dev;
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int ret;
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ret = device_find_first_child_by_uclass(parent, UCLASS_BOOTDEV, &dev);
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if (!ret) {
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ret = device_remove(dev, DM_REMOVE_NORMAL);
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if (ret)
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return log_msg_ret("rem", 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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return 0;
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}
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/**
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* bootdev_find_by_label() - Convert a label string to a bootdev device
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*
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* Looks up a label name to find the associated bootdev. For example, if the
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* label name is "mmc2", this will find a bootdev for an mmc device whose
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* sequence number is 2.
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*
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* @label: Label string to convert, e.g. "mmc2"
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* @devp: Returns bootdev device corresponding to that boot label
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* Return: 0 if OK, -EINVAL if the label name (e.g. "mmc") does not refer to a
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* uclass, -ENOENT if no bootdev for that media has the sequence number
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* (e.g. 2)
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*/
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int bootdev_find_by_label(const char *label, struct udevice **devp)
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{
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struct udevice *media;
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struct uclass *uc;
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enum uclass_id id;
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const char *end;
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int seq;
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seq = trailing_strtoln_end(label, NULL, &end);
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id = uclass_get_by_namelen(label, end - label);
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log_debug("find %s: seq=%d, id=%d/%s\n", label, seq, id,
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uclass_get_name(id));
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if (id == UCLASS_INVALID) {
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log_warning("Unknown uclass '%s' in label\n", label);
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return -EINVAL;
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}
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if (id == UCLASS_USB)
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id = UCLASS_MASS_STORAGE;
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/* Iterate through devices in the media uclass (e.g. UCLASS_MMC) */
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uclass_id_foreach_dev(id, media, uc) {
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struct udevice *bdev, *blk;
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int ret;
|
||||||
|
|
||||||
|
/* if there is no seq, match anything */
|
||||||
|
if (seq != -1 && dev_seq(media) != seq) {
|
||||||
|
log_debug("- skip, media seq=%d\n", dev_seq(media));
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = device_find_first_child_by_uclass(media, UCLASS_BOOTDEV,
|
||||||
|
&bdev);
|
||||||
|
if (ret) {
|
||||||
|
log_debug("- looking via blk, seq=%d, id=%d\n", seq,
|
||||||
|
id);
|
||||||
|
ret = blk_find_device(id, seq, &blk);
|
||||||
|
if (!ret) {
|
||||||
|
log_debug("- get from blk %s\n", blk->name);
|
||||||
|
ret = bootdev_get_from_blk(blk, &bdev);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (!ret) {
|
||||||
|
log_debug("- found %s\n", bdev->name);
|
||||||
|
*devp = bdev;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
log_debug("- no device in %s\n", media->name);
|
||||||
|
}
|
||||||
|
log_warning("Unknown seq %d for label '%s'\n", seq, label);
|
||||||
|
|
||||||
|
return -ENOENT;
|
||||||
|
}
|
||||||
|
|
||||||
|
int bootdev_find_by_any(const char *name, struct udevice **devp)
|
||||||
|
{
|
||||||
|
struct udevice *dev;
|
||||||
|
int ret, seq;
|
||||||
|
char *endp;
|
||||||
|
|
||||||
|
seq = simple_strtol(name, &endp, 16);
|
||||||
|
|
||||||
|
/* Select by name, label or number */
|
||||||
|
if (*endp) {
|
||||||
|
ret = uclass_get_device_by_name(UCLASS_BOOTDEV, name, &dev);
|
||||||
|
if (ret == -ENODEV) {
|
||||||
|
ret = bootdev_find_by_label(name, &dev);
|
||||||
|
if (ret) {
|
||||||
|
printf("Cannot find bootdev '%s' (err=%d)\n",
|
||||||
|
name, ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
ret = device_probe(dev);
|
||||||
|
}
|
||||||
|
if (ret) {
|
||||||
|
printf("Cannot probe bootdev '%s' (err=%d)\n", name,
|
||||||
|
ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
ret = uclass_get_device_by_seq(UCLASS_BOOTDEV, seq, &dev);
|
||||||
|
}
|
||||||
|
if (ret) {
|
||||||
|
printf("Cannot find '%s' (err=%d)\n", name, ret);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
*devp = dev;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int bootdev_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
|
||||||
|
struct bootflow *bflow)
|
||||||
|
{
|
||||||
|
const struct bootdev_ops *ops = bootdev_get_ops(dev);
|
||||||
|
|
||||||
|
if (!ops->get_bootflow)
|
||||||
|
return -ENOSYS;
|
||||||
|
memset(bflow, '\0', sizeof(*bflow));
|
||||||
|
bflow->dev = dev;
|
||||||
|
bflow->method = iter->method;
|
||||||
|
bflow->state = BOOTFLOWST_BASE;
|
||||||
|
|
||||||
|
return ops->get_bootflow(dev, iter, bflow);
|
||||||
|
}
|
||||||
|
|
||||||
|
void bootdev_clear_bootflows(struct udevice *dev)
|
||||||
|
{
|
||||||
|
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
|
||||||
|
|
||||||
|
while (!list_empty(&ucp->bootflow_head)) {
|
||||||
|
struct bootflow *bflow;
|
||||||
|
|
||||||
|
bflow = list_first_entry(&ucp->bootflow_head, struct bootflow,
|
||||||
|
bm_node);
|
||||||
|
/* later bootflow_remove(bflow); */
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* h_cmp_bootdev() - Compare two bootdevs to find out which should go first
|
||||||
|
*
|
||||||
|
* @v1: struct udevice * of first bootdev device
|
||||||
|
* @v2: struct udevice * of second bootdev device
|
||||||
|
* Return: sort order (<0 if dev1 < dev2, ==0 if equal, >0 if dev1 > dev2)
|
||||||
|
*/
|
||||||
|
static int h_cmp_bootdev(const void *v1, const void *v2)
|
||||||
|
{
|
||||||
|
const struct udevice *dev1 = *(struct udevice **)v1;
|
||||||
|
const struct udevice *dev2 = *(struct udevice **)v2;
|
||||||
|
const struct bootdev_uc_plat *ucp1 = dev_get_uclass_plat(dev1);
|
||||||
|
const struct bootdev_uc_plat *ucp2 = dev_get_uclass_plat(dev2);
|
||||||
|
int diff;
|
||||||
|
|
||||||
|
/* Use priority first */
|
||||||
|
diff = ucp1->prio - ucp2->prio;
|
||||||
|
if (diff)
|
||||||
|
return diff;
|
||||||
|
|
||||||
|
/* Fall back to seq for devices of the same priority */
|
||||||
|
diff = dev_seq(dev1) - dev_seq(dev2);
|
||||||
|
|
||||||
|
return diff;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* build_order() - Build the ordered list of bootdevs to use
|
||||||
|
*
|
||||||
|
* This builds an ordered list of devices by one of three methods:
|
||||||
|
* - using the boot_targets environment variable, if non-empty
|
||||||
|
* - using the bootdev-order devicetree property, if present
|
||||||
|
* - sorted by priority and sequence number
|
||||||
|
*
|
||||||
|
* @bootstd: BOOTSTD device to use
|
||||||
|
* @order: Bootdevs listed in default order
|
||||||
|
* @max_count: Number of entries in @order
|
||||||
|
* Return: number of bootdevs found in the ordering, or -E2BIG if the
|
||||||
|
* boot_targets string is too long, or -EXDEV if the ordering produced 0 results
|
||||||
|
*/
|
||||||
|
static int build_order(struct udevice *bootstd, struct udevice **order,
|
||||||
|
int max_count)
|
||||||
|
{
|
||||||
|
const char *overflow_target = NULL;
|
||||||
|
const char *const *labels;
|
||||||
|
struct udevice *dev;
|
||||||
|
const char *targets;
|
||||||
|
int i, ret, count;
|
||||||
|
|
||||||
|
targets = env_get("boot_targets");
|
||||||
|
labels = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
|
||||||
|
bootstd_get_bootdev_order(bootstd) : NULL;
|
||||||
|
if (targets) {
|
||||||
|
char str[BOOT_TARGETS_MAX_LEN];
|
||||||
|
char *target;
|
||||||
|
|
||||||
|
if (strlen(targets) >= BOOT_TARGETS_MAX_LEN)
|
||||||
|
return log_msg_ret("len", -E2BIG);
|
||||||
|
|
||||||
|
/* make a copy of the string, since strok() will change it */
|
||||||
|
strcpy(str, targets);
|
||||||
|
for (i = 0, target = strtok(str, " "); target;
|
||||||
|
target = strtok(NULL, " ")) {
|
||||||
|
ret = bootdev_find_by_label(target, &dev);
|
||||||
|
if (!ret) {
|
||||||
|
if (i == max_count) {
|
||||||
|
overflow_target = target;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
order[i++] = dev;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
count = i;
|
||||||
|
} else if (labels) {
|
||||||
|
int upto;
|
||||||
|
|
||||||
|
upto = 0;
|
||||||
|
for (i = 0; labels[i]; i++) {
|
||||||
|
ret = bootdev_find_by_label(labels[i], &dev);
|
||||||
|
if (!ret) {
|
||||||
|
if (upto == max_count) {
|
||||||
|
overflow_target = labels[i];
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
order[upto++] = dev;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
count = upto;
|
||||||
|
} else {
|
||||||
|
/* sort them into priority order */
|
||||||
|
count = max_count;
|
||||||
|
qsort(order, count, sizeof(struct udevice *), h_cmp_bootdev);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (overflow_target) {
|
||||||
|
log_warning("Expected at most %d bootdevs, but overflowed with boot_target '%s'\n",
|
||||||
|
max_count, overflow_target);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!count)
|
||||||
|
return log_msg_ret("targ", -EXDEV);
|
||||||
|
|
||||||
|
return count;
|
||||||
|
}
|
||||||
|
|
||||||
|
int bootdev_setup_iter_order(struct bootflow_iter *iter, struct udevice **devp)
|
||||||
|
{
|
||||||
|
struct udevice *bootstd, *dev = *devp, **order;
|
||||||
|
int upto, i;
|
||||||
|
int count;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
|
||||||
|
if (ret) {
|
||||||
|
log_err("Missing bootstd device\n");
|
||||||
|
return log_msg_ret("std", ret);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Handle scanning a single device */
|
||||||
|
if (dev) {
|
||||||
|
iter->flags |= BOOTFLOWF_SINGLE_DEV;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
count = uclass_id_count(UCLASS_BOOTDEV);
|
||||||
|
if (!count)
|
||||||
|
return log_msg_ret("count", -ENOENT);
|
||||||
|
|
||||||
|
order = calloc(count, sizeof(struct udevice *));
|
||||||
|
if (!order)
|
||||||
|
return log_msg_ret("order", -ENOMEM);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Get a list of bootdevs, in seq order (i.e. using aliases). There may
|
||||||
|
* be gaps so try to count up high enough to find them all.
|
||||||
|
*/
|
||||||
|
for (i = 0, upto = 0; upto < count && i < 20 + count * 2; i++) {
|
||||||
|
ret = uclass_find_device_by_seq(UCLASS_BOOTDEV, i, &dev);
|
||||||
|
if (!ret)
|
||||||
|
order[upto++] = dev;
|
||||||
|
}
|
||||||
|
log_debug("Found %d bootdevs\n", count);
|
||||||
|
if (upto != count)
|
||||||
|
log_debug("Expected %d bootdevs, found %d using aliases\n",
|
||||||
|
count, upto);
|
||||||
|
|
||||||
|
count = build_order(bootstd, order, upto);
|
||||||
|
if (count < 0) {
|
||||||
|
free(order);
|
||||||
|
return log_msg_ret("build", count);
|
||||||
|
}
|
||||||
|
|
||||||
|
iter->dev_order = order;
|
||||||
|
iter->num_devs = count;
|
||||||
|
iter->cur_dev = 0;
|
||||||
|
|
||||||
|
dev = *order;
|
||||||
|
ret = device_probe(dev);
|
||||||
|
if (ret)
|
||||||
|
return log_msg_ret("probe", ret);
|
||||||
|
*devp = dev;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int bootdev_post_bind(struct udevice *dev)
|
||||||
|
{
|
||||||
|
struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
|
||||||
|
|
||||||
|
INIT_LIST_HEAD(&ucp->bootflow_head);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int bootdev_pre_unbind(struct udevice *dev)
|
||||||
|
{
|
||||||
|
bootdev_clear_bootflows(dev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
UCLASS_DRIVER(bootdev) = {
|
||||||
|
.id = UCLASS_BOOTDEV,
|
||||||
|
.name = "bootdev",
|
||||||
|
.flags = DM_UC_FLAG_SEQ_ALIAS,
|
||||||
|
.per_device_plat_auto = sizeof(struct bootdev_uc_plat),
|
||||||
|
.post_bind = bootdev_post_bind,
|
||||||
|
.pre_unbind = bootdev_pre_unbind,
|
||||||
|
};
|
||||||
8
doc/device-tree-bindings/bootdev.txt
Normal file
8
doc/device-tree-bindings/bootdev.txt
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
U-Boot boot device (bootdev)
|
||||||
|
============================
|
||||||
|
|
||||||
|
A bootdev provides a way to obtain a bootflow file from a device. It is a
|
||||||
|
child of the media device (UCLASS_MMC, UCLASS_SPI_FLASH, etc.)
|
||||||
|
|
||||||
|
The bootdev driver is provided by the media devices. The bindings for each
|
||||||
|
are described in this file (to come).
|
||||||
275
include/bootdev.h
Normal file
275
include/bootdev.h
Normal file
@ -0,0 +1,275 @@
|
|||||||
|
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||||
|
/*
|
||||||
|
* Copyright 2021 Google LLC
|
||||||
|
* Written by Simon Glass <sjg@chromium.org>
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __bootdev_h
|
||||||
|
#define __bootdev_h
|
||||||
|
|
||||||
|
#include <linux/list.h>
|
||||||
|
|
||||||
|
struct bootflow;
|
||||||
|
struct bootflow_iter;
|
||||||
|
struct udevice;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* enum bootdev_prio_t - priority of each bootdev
|
||||||
|
*
|
||||||
|
* These values are associated with each bootdev and set up by the driver.
|
||||||
|
*
|
||||||
|
* Smallest value is the highest priority. By default, bootdevs are scanned from
|
||||||
|
* highest to lowest priority
|
||||||
|
*/
|
||||||
|
enum bootdev_prio_t {
|
||||||
|
BOOTDEVP_0_INTERNAL_FAST = 10,
|
||||||
|
BOOTDEVP_1_INTERNAL_SLOW = 20,
|
||||||
|
BOOTDEVP_2_SCAN_FAST = 30,
|
||||||
|
BOOTDEVP_3_SCAN_SLOW = 40,
|
||||||
|
BOOTDEVP_4_NET_BASE = 50,
|
||||||
|
BOOTDEVP_5_NET_FALLBACK = 60,
|
||||||
|
BOOTDEVP_6_SYSTEM = 70,
|
||||||
|
|
||||||
|
BOOTDEVP_COUNT,
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct bootdev_uc_plat - uclass information about a bootdev
|
||||||
|
*
|
||||||
|
* This is attached to each device in the bootdev uclass and accessible via
|
||||||
|
* dev_get_uclass_plat(dev)
|
||||||
|
*
|
||||||
|
* @bootflows: List of available bootflows for this bootdev
|
||||||
|
* @piro: Priority of this bootdev
|
||||||
|
*/
|
||||||
|
struct bootdev_uc_plat {
|
||||||
|
struct list_head bootflow_head;
|
||||||
|
enum bootdev_prio_t prio;
|
||||||
|
};
|
||||||
|
|
||||||
|
/** struct bootdev_ops - Operations for the bootdev uclass */
|
||||||
|
struct bootdev_ops {
|
||||||
|
/**
|
||||||
|
* get_bootflow() - get a bootflow
|
||||||
|
*
|
||||||
|
* @dev: Bootflow device to check
|
||||||
|
* @iter: Provides current dev, part, method to get. Should update
|
||||||
|
* max_part if there is a partition table. Should update state,
|
||||||
|
* subdir, fname, buf, size according to progress
|
||||||
|
* @bflow: Updated bootflow if found
|
||||||
|
* Return: 0 if OK, -ESHUTDOWN if there are no more bootflows on this
|
||||||
|
* device, -ENOSYS if this device doesn't support bootflows,
|
||||||
|
* other -ve value on other error
|
||||||
|
*/
|
||||||
|
int (*get_bootflow)(struct udevice *dev, struct bootflow_iter *iter,
|
||||||
|
struct bootflow *bflow);
|
||||||
|
};
|
||||||
|
|
||||||
|
#define bootdev_get_ops(dev) ((struct bootdev_ops *)(dev)->driver->ops)
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_get_bootflow() - get a bootflow
|
||||||
|
*
|
||||||
|
* @dev: Bootflow device to check
|
||||||
|
* @iter: Provides current part, method to get
|
||||||
|
* @bflow: Returns bootflow if found
|
||||||
|
* Return: 0 if OK, -ESHUTDOWN if there are no more bootflows on this device,
|
||||||
|
* -ENOSYS if this device doesn't support bootflows, other -ve value on
|
||||||
|
* other error
|
||||||
|
*/
|
||||||
|
int bootdev_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
|
||||||
|
struct bootflow *bflow);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_bind() - Bind a new named bootdev device
|
||||||
|
*
|
||||||
|
* @parent: Parent of the new device
|
||||||
|
* @drv_name: Driver name to use for the bootdev device
|
||||||
|
* @name: Name for the device (parent name is prepended)
|
||||||
|
* @devp: the new device (which has not been probed)
|
||||||
|
*/
|
||||||
|
int bootdev_bind(struct udevice *parent, const char *drv_name, const char *name,
|
||||||
|
struct udevice **devp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_find_in_blk() - Find a bootdev in a block device
|
||||||
|
*
|
||||||
|
* @dev: Bootflow device associated with this block device
|
||||||
|
* @blk: Block device to search
|
||||||
|
* @iter: Provides current dev, part, method to get. Should update
|
||||||
|
* max_part if there is a partition table
|
||||||
|
* @bflow: On entry, provides information about the partition and device to
|
||||||
|
* check. On exit, returns bootflow if found
|
||||||
|
* Return: 0 if found, -ESHUTDOWN if no more bootflows, other -ve on error
|
||||||
|
*/
|
||||||
|
int bootdev_find_in_blk(struct udevice *dev, struct udevice *blk,
|
||||||
|
struct bootflow_iter *iter, struct bootflow *bflow);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_list() - List all available bootdevs
|
||||||
|
*
|
||||||
|
* @probe: true to probe devices, false to leave them as is
|
||||||
|
*/
|
||||||
|
void bootdev_list(bool probe);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_clear_bootflows() - Clear bootflows from a bootdev
|
||||||
|
*
|
||||||
|
* Each bootdev maintains a list of discovered bootflows. This provides a
|
||||||
|
* way to clear it. These bootflows are removed from the global list too.
|
||||||
|
*
|
||||||
|
* @dev: bootdev device to update
|
||||||
|
*/
|
||||||
|
void bootdev_clear_bootflows(struct udevice *dev);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_add_bootflow() - Add a bootflow to the bootdev's list
|
||||||
|
*
|
||||||
|
* All fields in @bflow must be set up. Note that @bflow->dev is used to add the
|
||||||
|
* bootflow to that device.
|
||||||
|
*
|
||||||
|
* @dev: Bootdevice device to add to
|
||||||
|
* @bflow: Bootflow to add. Note that fields within bflow must be allocated
|
||||||
|
* since this function takes over ownership of these. This functions makes
|
||||||
|
* a copy of @bflow itself (without allocating its fields again), so the
|
||||||
|
* caller must dispose of the memory used by the @bflow pointer itself
|
||||||
|
* Return: 0 if OK, -ENOMEM if out of memory
|
||||||
|
*/
|
||||||
|
int bootdev_add_bootflow(struct bootflow *bflow);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_first_bootflow() - Get the first bootflow from a bootdev
|
||||||
|
*
|
||||||
|
* Returns the first bootflow attached to a bootdev
|
||||||
|
*
|
||||||
|
* @dev: bootdev device
|
||||||
|
* @bflowp: Returns a pointer to the bootflow
|
||||||
|
* Return: 0 if found, -ENOENT if there are no bootflows
|
||||||
|
*/
|
||||||
|
int bootdev_first_bootflow(struct udevice *dev, struct bootflow **bflowp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_next_bootflow() - Get the next bootflow from a bootdev
|
||||||
|
*
|
||||||
|
* Returns the next bootflow attached to a bootdev
|
||||||
|
*
|
||||||
|
* @bflowp: On entry, the last bootflow returned , e.g. from
|
||||||
|
* bootdev_first_bootflow()
|
||||||
|
* Return: 0 if found, -ENOENT if there are no more bootflows
|
||||||
|
*/
|
||||||
|
int bootdev_next_bootflow(struct bootflow **bflowp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_find_by_label() - Look up a bootdev by label
|
||||||
|
*
|
||||||
|
* Each bootdev has a label which contains the media-uclass name and a number,
|
||||||
|
* e.g. 'mmc2'. This looks up the label and returns the associated bootdev
|
||||||
|
*
|
||||||
|
* The lookup is performed based on the media device's sequence number. So for
|
||||||
|
* 'mmc2' this looks for a device in UCLASS_MMC with a dev_seq() of 2.
|
||||||
|
*
|
||||||
|
* @label: Label to look up (e.g. "mmc1" or "mmc0")
|
||||||
|
* @devp: Returns the bootdev device found, or NULL if none (note it does not
|
||||||
|
* return the media device, but its bootdev child)
|
||||||
|
* Return: 0 if OK, -EINVAL if the uclass is not supported by this board,
|
||||||
|
* -ENOENT if there is no device with that number
|
||||||
|
*/
|
||||||
|
int bootdev_find_by_label(const char *label, struct udevice **devp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_find_by_any() - Find a bootdev by name, label or sequence
|
||||||
|
*
|
||||||
|
* @name: name (e.g. "mmc2.bootdev"), label ("mmc2"), or sequence ("2") to find
|
||||||
|
* @devp: returns the device found, on success
|
||||||
|
* Return: 0 if OK, -ve on error
|
||||||
|
*/
|
||||||
|
int bootdev_find_by_any(const char *name, struct udevice **devp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_setup_iter_order() - Set up the ordering of bootdevs to scan
|
||||||
|
*
|
||||||
|
* This sets up the ordering information in @iter, based on the priority of each
|
||||||
|
* bootdev and the bootdev-order property in the bootstd node
|
||||||
|
*
|
||||||
|
* If a single device is requested, no ordering is needed
|
||||||
|
*
|
||||||
|
* @iter: Iterator to update with the order
|
||||||
|
* @devp: On entry, *devp is NULL to scan all, otherwise this is the (single)
|
||||||
|
* device to scan. Returns the first device to use, which is the passed-in
|
||||||
|
* @devp if it was non-NULL
|
||||||
|
* Return: 0 if OK, -ENOENT if no bootdevs, -ENOMEM if out of memory, other -ve
|
||||||
|
* on other error
|
||||||
|
*/
|
||||||
|
int bootdev_setup_iter_order(struct bootflow_iter *iter, struct udevice **devp);
|
||||||
|
|
||||||
|
#if CONFIG_IS_ENABLED(BOOTSTD)
|
||||||
|
/**
|
||||||
|
* bootdev_setup_for_dev() - Bind a new bootdev device
|
||||||
|
*
|
||||||
|
* Creates a bootdev device as a child of @parent. This should be called from
|
||||||
|
* the driver's bind() method or its uclass' post_bind() method.
|
||||||
|
*
|
||||||
|
* If a child bootdev already exists, this function does nothing
|
||||||
|
*
|
||||||
|
* @parent: Parent device (e.g. MMC or Ethernet)
|
||||||
|
* @drv_name: Name of bootdev driver to bind
|
||||||
|
* Return: 0 if OK, -ve on error
|
||||||
|
*/
|
||||||
|
int bootdev_setup_for_dev(struct udevice *parent, const char *drv_name);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_setup_for_blk() - Bind a new bootdev device for a blk device
|
||||||
|
*
|
||||||
|
* Creates a bootdev device as a sibling of @blk. This should be called from
|
||||||
|
* the driver's bind() method or its uclass' post_bind() method, at the same
|
||||||
|
* time as the bould device is bound
|
||||||
|
*
|
||||||
|
* If a device of the same name already exists, this function does nothing
|
||||||
|
*
|
||||||
|
* @parent: Parent device (e.g. MMC or Ethernet)
|
||||||
|
* @drv_name: Name of bootdev driver to bind
|
||||||
|
* Return: 0 if OK, -ve on error
|
||||||
|
*/
|
||||||
|
int bootdev_setup_sibling_blk(struct udevice *blk, const char *drv_name);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_get_sibling_blk() - Locate the block device for a bootdev
|
||||||
|
*
|
||||||
|
* @dev: bootdev to check
|
||||||
|
* @blkp: returns associated block device
|
||||||
|
* Return: 0 if OK, -EINVAL if @dev is not a bootdev device, other -ve on other
|
||||||
|
* error
|
||||||
|
*/
|
||||||
|
int bootdev_get_sibling_blk(struct udevice *dev, struct udevice **blkp);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* bootdev_unbind_dev() - Unbind a bootdev device
|
||||||
|
*
|
||||||
|
* Remove and unbind a bootdev device which is a child of @parent. This should
|
||||||
|
* be called from the driver's unbind() method or its uclass' post_bind()
|
||||||
|
* method.
|
||||||
|
*
|
||||||
|
* @parent: Parent device (e.g. MMC or Ethernet)
|
||||||
|
* Return: 0 if OK, -ve on error
|
||||||
|
*/
|
||||||
|
int bootdev_unbind_dev(struct udevice *parent);
|
||||||
|
#else
|
||||||
|
static inline int bootdev_setup_for_dev(struct udevice *parent,
|
||||||
|
const char *drv_name)
|
||||||
|
{
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int bootdev_setup_sibling_blk(struct udevice *blk,
|
||||||
|
const char *drv_name)
|
||||||
|
{
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int bootdev_unbind_dev(struct udevice *parent)
|
||||||
|
{
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
||||||
@ -38,6 +38,7 @@ enum uclass_id {
|
|||||||
UCLASS_AXI, /* AXI bus */
|
UCLASS_AXI, /* AXI bus */
|
||||||
UCLASS_BLK, /* Block device */
|
UCLASS_BLK, /* Block device */
|
||||||
UCLASS_BOOTCOUNT, /* Bootcount backing store */
|
UCLASS_BOOTCOUNT, /* Bootcount backing store */
|
||||||
|
UCLASS_BOOTDEV, /* Boot device for locating an OS to boot */
|
||||||
UCLASS_BOOTSTD, /* Standard boot driver */
|
UCLASS_BOOTSTD, /* Standard boot driver */
|
||||||
UCLASS_BUTTON, /* Button */
|
UCLASS_BUTTON, /* Button */
|
||||||
UCLASS_CACHE, /* Cache controller */
|
UCLASS_CACHE, /* Cache controller */
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user