[PATCH v4 6/7] cmd: Add a mux command
Pratyush Yadav
p.yadav at ti.com
Fri Oct 16 12:46:35 CEST 2020
This command lets the user list, select, and deselect mux controllers
introduced with the mux framework on the fly. It has 3 subcommands:
list, select, and deselect.
List: Lists all the mux present on the system. The muxes are listed for
each chip. The chip is identified by its device name. Each chip can have
a number of mux controllers. Each is listed in sequence and is assigned
a sequential ID based on its position in the mux chip. It lists details
like ID, whether the mux is currently selected or not, the current
state, the idle state, and the number of states.
A sample output would look something like:
=> mux list
a-mux-controller:
ID Selected Current State Idle State Num States
0 no unknown as-is 0x4
1 no 0x2 0x2 0x10
2 no 0x73 0x73 0x100
another-mux-controller:
ID Selected Current State Idle State Num States
0 no 0x1 0x1 0x4
1 no 0x2 0x2 0x4
Select: Selects a given mux and puts it in the specified state. This
subcommand takes 3 arguments: mux chip, mux ID, state to set
the mux in. The arguments mux chip and mux ID are used to identify which
mux needs to be selected, and then it is selected to the given state.
The mux needs to be deselected before it can be selected again in
another state. The state should be a hexadecimal number.
For example:
=> mux list
a-mux-controller:
ID Selected Current State Idle State Num States
0 no 0x1 0x1 0x4
1 no 0x1 0x1 0x4
=> mux select a-mux-controller 0 0x3
=> mux list
a-mux-controller:
ID Selected Current State Idle State Num States
0 yes 0x3 0x1 0x4
1 no 0x1 0x1 0x4
Deselect: Deselects a given mux and puts it in its idle state. This
subcommand takes 2 arguments: the mux chip and mux ID to identify which
mux needs to be deselected. So in the above example, we can deselect mux
0 using:
=> mux deselect a-mux-controller 0
=> mux list
a-mux-controller:
ID Selected Current State Idle State Num States
0 no 0x1 0x1 0x4
1 no 0x1 0x1 0x4
Signed-off-by: Pratyush Yadav <p.yadav at ti.com>
---
Notes:
Changes in v4:
- Use spaces to print columns in 'mux list' instead of tabs. Tabs don't
work well with ut_assert_nextline() because it calls
membuff_readline() down the call chain and tells it to consider
characters below the space character as EOL. This means
ut_assert_nextline() can only assert for the next column not the next
line if a command is using tabs.
cmd/Kconfig | 6 ++
cmd/Makefile | 1 +
cmd/mux.c | 183 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 190 insertions(+)
create mode 100644 cmd/mux.c
diff --git a/cmd/Kconfig b/cmd/Kconfig
index a3166e4f31..a25d6d62d0 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1073,6 +1073,12 @@ config CMD_MTD
help
MTD commands support.
+config CMD_MUX
+ bool "mux"
+ depends on MULTIPLEXER
+ help
+ List, select, and deselect mux controllers on the fly.
+
config CMD_NAND
bool "nand"
default y if NAND_SUNXI
diff --git a/cmd/Makefile b/cmd/Makefile
index 19a891633f..79a57b8482 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_CMD_CLONE) += clone.o
ifneq ($(CONFIG_CMD_NAND)$(CONFIG_CMD_SF),)
obj-y += legacy-mtd-utils.o
endif
+obj-$(CONFIG_CMD_MUX) += mux.o
obj-$(CONFIG_CMD_NAND) += nand.o
obj-$(CONFIG_CMD_NET) += net.o
obj-$(CONFIG_CMD_NVEDIT_EFI) += nvedit_efi.o
diff --git a/cmd/mux.c b/cmd/mux.c
new file mode 100644
index 0000000000..3a0839ec1f
--- /dev/null
+++ b/cmd/mux.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * List, select, and deselect mux controllers on the fly.
+ *
+ * Copyright (c) 2020 Texas Instruments Inc.
+ * Author: Pratyush Yadav <p.yadav at ti.com>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <dm.h>
+#include <mux.h>
+#include <mux-internal.h>
+#include <linux/err.h>
+#include <dt-bindings/mux/mux.h>
+
+#define COLUMN_SIZE 16
+
+/*
+ * Print a member of a column. The total size of the text printed, including
+ * trailing whitespace, will always be COLUMN_SIZE.
+ */
+#define PRINT_COLUMN(fmt, args...) do { \
+ char buf[COLUMN_SIZE + 1]; \
+ snprintf(buf, COLUMN_SIZE + 1, fmt, ##args); \
+ printf("%-*s", COLUMN_SIZE, buf); \
+} while (0)
+
+/*
+ * Find a mux based on its device name in argv[1] and index in the chip in
+ * argv[2].
+ */
+static struct mux_control *cmd_mux_find(char *const argv[])
+{
+ struct udevice *dev;
+ struct mux_chip *chip;
+ int ret;
+ unsigned long id;
+
+ ret = strict_strtoul(argv[2], 10, &id);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = uclass_get_device_by_name(UCLASS_MUX, argv[1], &dev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ chip = dev_get_uclass_priv(dev);
+ if (!chip)
+ return ERR_PTR(ret);
+
+ if (id >= chip->controllers)
+ return ERR_PTR(-EINVAL);
+
+ return &chip->mux[id];
+}
+
+/*
+ * Print the details of a mux. The columns printed correspond to: "Selected",
+ * "Current State", "Idle State", and "Num States".
+ */
+static void print_mux(struct mux_control *mux)
+{
+ PRINT_COLUMN("%s", mux->in_use ? "yes" : "no");
+
+ if (mux->cached_state == MUX_IDLE_AS_IS)
+ PRINT_COLUMN("%s", "unknown");
+ else
+ PRINT_COLUMN("0x%x", mux->cached_state);
+
+ if (mux->idle_state == MUX_IDLE_AS_IS)
+ PRINT_COLUMN("%s", "as-is");
+ else if (mux->idle_state == MUX_IDLE_DISCONNECT)
+ PRINT_COLUMN("%s", "disconnect");
+ else
+ PRINT_COLUMN("0x%x", mux->idle_state);
+
+ PRINT_COLUMN("0x%x", mux->states);
+
+ printf("\n");
+}
+
+static int do_mux_list(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct udevice *dev;
+ struct mux_chip *chip;
+ int j;
+
+ for (uclass_first_device(UCLASS_MUX, &dev);
+ dev;
+ uclass_next_device(&dev)) {
+ chip = dev_get_uclass_priv(dev);
+ if (!chip) {
+ dev_err(dev, "can't find mux chip\n");
+ continue;
+ }
+
+ printf("%s:\n", dev->name);
+
+ printf(" ");
+ PRINT_COLUMN("ID");
+ PRINT_COLUMN("Selected");
+ PRINT_COLUMN("Current State");
+ PRINT_COLUMN("Idle State");
+ PRINT_COLUMN("Num States");
+ printf("\n");
+ for (j = 0; j < chip->controllers; j++) {
+ printf(" ");
+ PRINT_COLUMN("%d", j);
+ print_mux(&chip->mux[j]);
+ }
+ printf("\n");
+ }
+
+ return 0;
+}
+
+static int do_mux_select(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct mux_control *mux;
+ int ret;
+ unsigned long state;
+
+ if (argc != 4)
+ return CMD_RET_USAGE;
+
+ mux = cmd_mux_find(argv);
+ if (IS_ERR_OR_NULL(mux)) {
+ printf("Failed to find the specified mux\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = strict_strtoul(argv[3], 16, &state);
+ if (ret) {
+ printf("Invalid state\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = mux_control_select(mux, state);
+ if (ret) {
+ printf("Failed to select requested state\n");
+ return CMD_RET_FAILURE;
+ }
+
+ return CMD_RET_SUCCESS;
+}
+
+static int do_mux_deselect(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct mux_control *mux;
+ int ret;
+
+ if (argc != 3)
+ return CMD_RET_USAGE;
+
+ mux = cmd_mux_find(argv);
+ if (IS_ERR_OR_NULL(mux)) {
+ printf("Failed to find the specified mux\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = mux_control_deselect(mux);
+ if (ret) {
+ printf("Failed to deselect mux\n");
+ return CMD_RET_FAILURE;
+ }
+
+ return CMD_RET_SUCCESS;
+}
+
+static char mux_help_text[] =
+ "list - List all Muxes and their states\n"
+ "select <chip> <id> <state> - Select the given mux state\n"
+ "deselect <chip> <id> - Deselect the given mux and reset it to its idle state";
+
+U_BOOT_CMD_WITH_SUBCMDS(mux, "List, select, and deselect muxes", mux_help_text,
+ U_BOOT_SUBCMD_MKENT(list, 1, 1, do_mux_list),
+ U_BOOT_SUBCMD_MKENT(select, 4, 0, do_mux_select),
+ U_BOOT_SUBCMD_MKENT(deselect, 3, 0, do_mux_deselect));
--
2.28.0
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