Mostly as an aid for debugging RTC drivers, provide a command that can
be used to read/write arbitrary registers (assuming the driver
provides the read/write methods or their single-register-at-a-time
variants).
Signed-off-by: Rasmus Villemoes <rasmus.villem...@prevas.dk>
---
cmd/Kconfig | 6 ++
cmd/Makefile | 1 +
cmd/rtc.c | 159 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 166 insertions(+)
create mode 100644 cmd/rtc.c
diff --git a/cmd/Kconfig b/cmd/Kconfig
index f9be1988f6..7eea25facd 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1715,6 +1715,12 @@ config CMD_DATE
Enable the 'date' command for getting/setting the time/date in RTC
devices.
+config CMD_RTC
+ bool "rtc"
+ depends on DM_RTC
+ help
+ Enable the 'rtc' command for low-level access to RTC devices.
+
config CMD_TIME
bool "time"
help
diff --git a/cmd/Makefile b/cmd/Makefile
index 974ad48b0a..c7992113e4 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -120,6 +120,7 @@ obj-$(CONFIG_CMD_REISER) += reiser.o
obj-$(CONFIG_CMD_REMOTEPROC) += remoteproc.o
obj-$(CONFIG_CMD_RNG) += rng.o
obj-$(CONFIG_CMD_ROCKUSB) += rockusb.o
+obj-$(CONFIG_CMD_RTC) += rtc.o
obj-$(CONFIG_SANDBOX) += host.o
obj-$(CONFIG_CMD_SATA) += sata.o
obj-$(CONFIG_CMD_NVME) += nvme.o
diff --git a/cmd/rtc.c b/cmd/rtc.c
new file mode 100644
index 0000000000..e26b7ca18f
--- /dev/null
+++ b/cmd/rtc.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <hexdump.h>
+#include <i2c.h>
+#include <mapmem.h>
+#include <rtc.h>
+
+#define MAX_RTC_BYTES 32
+
+static int do_rtc_read(struct udevice *dev, int argc, char * const argv[])
+{
+ u8 buf[MAX_RTC_BYTES];
+ int reg, len, ret;
+ u8 *addr;
+
+ if (argc < 2 || argc > 3)
+ return CMD_RET_USAGE;
+
+ reg = simple_strtoul(argv[0], NULL, 0);
+ len = simple_strtoul(argv[1], NULL, 0);
+ if (argc == 3) {
+ addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
+ } else {
+ if (len > sizeof(buf)) {
+ printf("can read at most %d registers at a time\n",
MAX_RTC_BYTES);
+ return CMD_RET_FAILURE;
+ }
+ addr = buf;
+ }
+
+ ret = rtc_read(dev, reg, addr, len);
+ if (ret) {
+ printf("rtc_read() failed: %d\n", ret);
+ ret = CMD_RET_FAILURE;
+ goto out;
+ } else {
+ ret = CMD_RET_SUCCESS;
+ }
+
+ if (argc == 2) {
+ while (len--)
+ printf("%d: 0x%02x\n", reg++, *addr++);
+ }
+out:
+ if (argc == 3)
+ unmap_sysmem(addr);
+ return ret;
+}
+
+static int do_rtc_write(struct udevice *dev, int argc, char * const argv[])
+{
+ u8 buf[MAX_RTC_BYTES];
+ u8 *addr;
+ int reg, len, ret;
+
+ if (argc < 2 || argc > 3)
+ return CMD_RET_USAGE;
+
+ reg = simple_strtoul(argv[0], NULL, 0);
+
+ if (argc == 3) {
+ len = simple_strtoul(argv[1], NULL, 0);
+ addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
+ } else {
+ const char *s = argv[1];
+
+ /* Convert hexstring, bail out if too long. */
+ addr = buf;
+ len = strlen(s);
+ if (len > 2*MAX_RTC_BYTES) {
+ printf("hex string too long, can write at most %d
bytes\n", MAX_RTC_BYTES);
+ return CMD_RET_FAILURE;
+ }
+ len /= 2;
+ if (hex2bin(addr, s, len)) {
+ printf("invalid hex string\n");
+ return CMD_RET_FAILURE;
+ }
+ }
+
+ ret = rtc_write(dev, reg, addr, len);
+ if (ret) {
+ printf("rtc_write() failed: %d\n", ret);
+ ret = CMD_RET_FAILURE;
+ } else {
+ ret = CMD_RET_SUCCESS;
+ }
+
+ if (argc == 3)
+ unmap_sysmem(addr);
+ return ret;
+}
+
+int do_rtc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ static int curr_rtc = 0;
+ struct udevice *dev;
+ int ret, idx;
+
+ if (argc < 2)
+ return CMD_RET_USAGE;
+
+ argc--;
+ argv++;
+
+ if (!strcmp(argv[0], "list")) {
+ struct uclass *uc;
+ idx = 0;
+
+ uclass_id_foreach_dev(UCLASS_RTC, dev, uc) {
+ printf("RTC #%d - %s\n", idx++, dev->name);
+ }
+ if (!idx) {
+ printf("*** no RTC devices available ***\n");
+ return CMD_RET_FAILURE;
+ }
+ return CMD_RET_SUCCESS;
+ }
+
+ idx = curr_rtc;
+ if (!strcmp(argv[0], "dev") && argc >= 2)
+ idx = simple_strtoul(argv[1], NULL, 10);
+
+ ret = uclass_get_device(UCLASS_RTC, idx, &dev);
+ if (ret) {
+ printf("Cannot find RTC #%d: err=%d\n", idx, ret);
+ return CMD_RET_FAILURE;
+ }
+
+ if (!strcmp(argv[0], "dev")) {
+ /* Show the existing or newly selected RTC */
+ if (argc >= 2)
+ curr_rtc = idx;
+ printf("RTC #%d - %s\n", idx, dev->name);
+ return CMD_RET_SUCCESS;
+ }
+
+ if (!strcmp(argv[0], "read"))
+ return do_rtc_read(dev, argc - 1, argv + 1);
+
+ if (!strcmp(argv[0], "write"))
+ return do_rtc_write(dev, argc - 1, argv + 1);
+
+ return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(
+ rtc, 5, 0, do_rtc,
+ "RTC subsystem",
+ "list - show available rtc devices\n"
+ "rtc dev [n] - show or set current rtc device\n"
+ "rtc read <reg> <count> - read and display 8-bit registers
starting at <reg>\n"
+ "rtc read <reg> <count> <addr> - read 8-bit registers starting at
<reg> to memory <addr>\n"
+ "rtc write <reg> <hexstring> - write 8-bit registers starting at
<reg>\n"
+ "rtc write <reg> <count> <addr> - write from memory <addr> to 8-bit
registers starting at <reg>\n"
+);
--
2.23.0
