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@@ -0,0 +1,134 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright (c) 2020 Wind River Systems, Inc.
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+ *
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+ * Author:
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+ * Bin Meng <bin.meng@windriver.com>
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+ *
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+ * A command interface to access misc devices with MISC uclass driver APIs.
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+ */
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+
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+#include <common.h>
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+#include <command.h>
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+#include <dm.h>
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+#include <errno.h>
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+#include <misc.h>
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+
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+enum misc_op {
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+ MISC_OP_READ,
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+ MISC_OP_WRITE
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+};
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+
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+static char *misc_op_str[] = {
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+ "read",
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+ "write"
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+};
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+
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+static int do_misc_list(struct cmd_tbl *cmdtp, int flag,
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+ int argc, char *const argv[])
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+{
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+ struct udevice *dev;
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+
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+ printf("Device Index Driver\n");
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+ printf("-------------------------------------\n");
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+ for (uclass_first_device(UCLASS_MISC, &dev);
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+ dev;
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+ uclass_next_device(&dev)) {
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+ printf("%-20s %5d %10s\n", dev->name, dev->seq,
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+ dev->driver->name);
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+ }
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+
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+ return 0;
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+}
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+
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+static int do_misc_op(struct cmd_tbl *cmdtp, int flag,
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+ int argc, char *const argv[], enum misc_op op)
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+{
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+ int (*misc_op)(struct udevice *, int, void *, int);
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+ struct udevice *dev;
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+ int offset;
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+ void *buf;
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+ int size;
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+ int ret;
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+
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+ ret = uclass_get_device_by_name(UCLASS_MISC, argv[0], &dev);
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+ if (ret) {
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+ printf("Unable to find device %s\n", argv[0]);
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+ return ret;
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+ }
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+
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+ offset = simple_strtoul(argv[1], NULL, 16);
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+ buf = (void *)simple_strtoul(argv[2], NULL, 16);
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+ size = simple_strtoul(argv[3], NULL, 16);
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+
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+ if (op == MISC_OP_READ)
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+ misc_op = misc_read;
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+ else
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+ misc_op = misc_write;
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+
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+ ret = misc_op(dev, offset, buf, size);
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+ if (ret < 0) {
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+ if (ret == -ENOSYS) {
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+ printf("The device does not support %s\n",
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+ misc_op_str[op]);
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+ ret = 0;
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+ }
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+ } else {
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+ if (ret == size)
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+ ret = 0;
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+ else
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+ printf("Partially %s %d bytes\n", misc_op_str[op], ret);
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+ }
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+
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+ return ret;
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+}
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+
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+static int do_misc_read(struct cmd_tbl *cmdtp, int flag,
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+ int argc, char *const argv[])
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+{
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+ return do_misc_op(cmdtp, flag, argc, argv, MISC_OP_READ);
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+}
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+
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+static int do_misc_write(struct cmd_tbl *cmdtp, int flag,
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+ int argc, char *const argv[])
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+{
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+ return do_misc_op(cmdtp, flag, argc, argv, MISC_OP_WRITE);
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+}
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+
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+static struct cmd_tbl misc_commands[] = {
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+ U_BOOT_CMD_MKENT(list, 0, 1, do_misc_list, "", ""),
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+ U_BOOT_CMD_MKENT(read, 4, 1, do_misc_read, "", ""),
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+ U_BOOT_CMD_MKENT(write, 4, 1, do_misc_write, "", ""),
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+};
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+
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+static int do_misc(struct cmd_tbl *cmdtp, int flag,
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+ int argc, char *const argv[])
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+{
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+ struct cmd_tbl *misc_cmd;
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+ int ret;
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+
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+ if (argc < 2)
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+ return CMD_RET_USAGE;
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+ misc_cmd = find_cmd_tbl(argv[1], misc_commands,
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+ ARRAY_SIZE(misc_commands));
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+ argc -= 2;
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+ argv += 2;
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+ if (!misc_cmd || argc != misc_cmd->maxargs)
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+ return CMD_RET_USAGE;
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+
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+ ret = misc_cmd->cmd(misc_cmd, flag, argc, argv);
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+
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+ return cmd_process_error(misc_cmd, ret);
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+}
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+
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+U_BOOT_CMD(
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+ misc, 6, 1, do_misc,
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+ "Access miscellaneous devices with MISC uclass driver APIs",
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+ "list - list all miscellaneous devices\n"
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+ "misc read name offset addr len - read `len' bytes starting at\n"
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+ " `offset' of device `name'\n"
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+ " to memory at `addr'\n"
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+ "misc write name offset addr len - write `len' bytes starting at\n"
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+ " `offset' of device `name'\n"
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+ " from memory at `addr'"
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+);
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