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.villemoes@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" +);