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![Kory Maincent](/assets/img/avatar_default.png)
This patch adds a new "extension" command, which aims at detecting extension boards connected to the hardware platform, and apply the Device Tree overlays that describe the hardware present on those extension boards. In order to enable this mechanism, board-specific code must implement the extension_board_scan() function that fills in a linked list of "struct extension", each describing one extension board. In addition, the board-specific code must select the SUPPORT_EXTENSION_SCAN Kconfig boolean. Based on this: - "extension scan" makes the generic code call the board-specific extension_board_scan() function to retrieve the list of detected extension boards. - "extension list" allows to list the detected extension boards. - "extension apply <number>|all" allows to apply the Device Tree overlay(s) corresponding to one, or all, extension boards The latter requires two environment variables to exist and set one variable to run: - extension_overlay_addr: the RAM address where to load the Device Tree overlays - extension_overlay_cmd: the U-Boot command to load one overlay. Indeed, the location and mechanism to load DT overlays is very setup specific. - extension_overlay_name: set by the command: the name of the DT which will be load during the execution. When calling the command described in the extension_overlay_cmd variable, the variable extension_overlay_name will be defined. So a typical extension_overlay_cmd will look like this: extension_overlay_cmd=load mmc 0:1 $extension_overlay_addr /boot/$extension_overlay_name Here is an example on how to use it: => run loadfdt => fdt addr $fdtaddr => setenv extension_overlay_addr 0x1000 => setenv extension_overlay_cmd 'load mmc 0:1 ${extension_overlay_addr} /boot/${extension_overlay_name}' => extension scan Found 1 extension board(s). => extension apply 0 519 bytes read in 3 ms (168.9 KiB/s) Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> Reviewed-by: Maxime Ripard <maxime@cerno.tech>
168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2021
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* Köry Maincent, Bootlin, <kory.maincent@bootlin.com>
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*/
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#include <common.h>
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#include <command.h>
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#include <malloc.h>
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#include <extension_board.h>
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#include <mapmem.h>
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#include <linux/libfdt.h>
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#include <fdt_support.h>
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static LIST_HEAD(extension_list);
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static int extension_apply(struct extension *extension)
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{
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char *overlay_cmd;
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ulong extrasize, overlay_addr;
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struct fdt_header *blob;
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if (!working_fdt) {
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printf("No FDT memory address configured. Please configure\n"
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"the FDT address via \"fdt addr <address>\" command.\n");
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return CMD_RET_FAILURE;
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}
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overlay_cmd = env_get("extension_overlay_cmd");
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if (!overlay_cmd) {
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printf("Environment extension_overlay_cmd is missing\n");
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return CMD_RET_FAILURE;
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}
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overlay_addr = env_get_hex("extension_overlay_addr", 0);
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if (!overlay_addr) {
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printf("Environment extension_overlay_addr is missing\n");
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return CMD_RET_FAILURE;
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}
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env_set("extension_overlay_name", extension->overlay);
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if (run_command(overlay_cmd, 0) != 0)
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return CMD_RET_FAILURE;
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extrasize = env_get_hex("filesize", 0);
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if (!extrasize)
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return CMD_RET_FAILURE;
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fdt_shrink_to_minimum(working_fdt, extrasize);
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blob = map_sysmem(overlay_addr, 0);
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if (!fdt_valid(&blob))
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return CMD_RET_FAILURE;
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/* apply method prints messages on error */
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if (fdt_overlay_apply_verbose(working_fdt, blob))
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return CMD_RET_FAILURE;
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return CMD_RET_SUCCESS;
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}
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static int do_extension_list(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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int i = 0;
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struct extension *extension;
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if (list_empty(&extension_list)) {
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printf("No extension registered - Please run \"extension scan\"\n");
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return CMD_RET_SUCCESS;
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}
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list_for_each_entry(extension, &extension_list, list) {
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printf("Extension %d: %s\n", i++, extension->name);
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printf("\tManufacturer: \t\t%s\n", extension->owner);
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printf("\tVersion: \t\t%s\n", extension->version);
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printf("\tDevicetree overlay: \t%s\n", extension->overlay);
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printf("\tOther information: \t%s\n", extension->other);
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}
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return CMD_RET_SUCCESS;
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}
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static int do_extension_scan(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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struct extension *extension, *next;
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int extension_num;
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list_for_each_entry_safe(extension, next, &extension_list, list) {
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list_del(&extension->list);
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free(extension);
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}
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extension_num = extension_board_scan(&extension_list);
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if (extension_num < 0)
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return CMD_RET_FAILURE;
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printf("Found %d extension board(s).\n", extension_num);
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return CMD_RET_SUCCESS;
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}
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static int do_extension_apply(struct cmd_tbl *cmdtp, int flag,
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int argc, char *const argv[])
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{
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struct extension *extension = NULL;
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struct list_head *entry;
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int i = 0, extension_id, ret;
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if (argc < 2)
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return CMD_RET_USAGE;
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if (strcmp(argv[1], "all") == 0) {
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list_for_each_entry(extension, &extension_list, list) {
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ret = extension_apply(extension);
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if (ret != CMD_RET_SUCCESS)
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break;
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}
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} else {
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extension_id = simple_strtol(argv[1], NULL, 10);
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list_for_each(entry, &extension_list) {
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if (i == extension_id) {
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extension = list_entry(entry, struct extension, list);
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break;
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}
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i++;
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}
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if (!extension) {
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printf("Wrong extension number\n");
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return CMD_RET_FAILURE;
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}
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ret = extension_apply(extension);
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}
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return ret;
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}
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static struct cmd_tbl cmd_extension[] = {
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U_BOOT_CMD_MKENT(scan, 1, 1, do_extension_scan, "", ""),
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U_BOOT_CMD_MKENT(list, 1, 0, do_extension_list, "", ""),
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U_BOOT_CMD_MKENT(apply, 2, 0, do_extension_apply, "", ""),
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};
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static int do_extensionops(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct cmd_tbl *cp;
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/* Drop the extension command */
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argc--;
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argv++;
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cp = find_cmd_tbl(argv[0], cmd_extension, ARRAY_SIZE(cmd_extension));
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if (cp)
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return cp->cmd(cmdtp, flag, argc, argv);
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return CMD_RET_USAGE;
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}
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U_BOOT_CMD(extension, 3, 1, do_extensionops,
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"Extension board management sub system",
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"scan - scan plugged extension(s) board(s)\n"
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"extension list - lists available extension(s) board(s)\n"
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"extension apply <extension number|all> - applies DT overlays corresponding to extension boards\n"
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);
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