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rtc: add rtc command

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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).

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
This commit is contained in:
Rasmus Villemoes 2020-07-06 22:01:15 +02:00 • committed by Heiko Schocher
parent 29f965a7ec
commit 803a859884
3 changed files with 174 additions and 0 deletions
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6
cmd/Kconfig
View file

@ -1739,6 +1739,12 @@ 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

1
cmd/Makefile
View file

@ -122,6 +122,7 @@ 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

167
cmd/rtc.c Normal file
View file

@ -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"
);