@@ -1718,6 +1718,12 @@ 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
@@ -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
new file mode 100644
@@ -0,0 +1,167 @@
+// 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, r;
+
+ if (argc < 2 || argc > 3)
+ return CMD_RET_USAGE;
+
+ reg = simple_strtoul(argv[0], NULL, 16);
+ len = simple_strtoul(argv[1], NULL, 16);
+
+ if (argc == 3) {
+ u8 *addr;
+
+ addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
+ ret = dm_rtc_read(dev, reg, addr, len);
+ unmap_sysmem(addr);
+ if (ret) {
+ printf("dm_rtc_read() failed: %d\n", ret);
+ return CMD_RET_FAILURE;
+ }
+ return CMD_RET_SUCCESS;
+ }
+
+ while (len) {
+ r = min_t(int, len, sizeof(buf));
+ ret = dm_rtc_read(dev, reg, buf, r);
+ if (ret) {
+ printf("dm_rtc_read() failed: %d\n", ret);
+ return CMD_RET_FAILURE;
+ }
+ print_buffer(reg, buf, 1, r, 0);
+ len -= r;
+ reg += r;
+ }
+
+ return CMD_RET_SUCCESS;
+}
+
+static int do_rtc_write(struct udevice *dev, int argc, char * const argv[])
+{
+ u8 buf[MAX_RTC_BYTES];
+ int reg, len, ret;
+ const char *s;
+ int slen;
+
+ if (argc < 2 || argc > 3)
+ return CMD_RET_USAGE;
+
+ reg = simple_strtoul(argv[0], NULL, 16);
+
+ if (argc == 3) {
+ u8 *addr;
+
+ len = simple_strtoul(argv[1], NULL, 16);
+ addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
+ ret = dm_rtc_write(dev, reg, addr, len);
+ unmap_sysmem(addr);
+ if (ret) {
+ printf("dm_rtc_write() failed: %d\n", ret);
+ return CMD_RET_FAILURE;
+ }
+ return CMD_RET_SUCCESS;
+ }
+
+ s = argv[1];
+ slen = strlen(s);
+
+ if (slen % 2) {
+ printf("invalid hex string\n");
+ return CMD_RET_FAILURE;
+ }
+
+ while (slen) {
+ len = min_t(int, slen / 2, sizeof(buf));
+ if (hex2bin(buf, s, len)) {
+ printf("invalid hex string\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = dm_rtc_write(dev, reg, buf, len);
+ if (ret) {
+ printf("dm_rtc_write() failed: %d\n", ret);
+ return CMD_RET_FAILURE;
+ }
+ s += 2 * len;
+ slen -= 2 * len;
+ }
+
+ return CMD_RET_SUCCESS;
+}
+
+int do_rtc(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
+{
+ static int curr_rtc;
+ 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"
+);