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![Rasmus Villemoes](/assets/img/avatar_default.png)
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>
168 lines
3.6 KiB
C
168 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <hexdump.h>
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#include <i2c.h>
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#include <mapmem.h>
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#include <rtc.h>
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#define MAX_RTC_BYTES 32
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static int do_rtc_read(struct udevice *dev, int argc, char * const argv[])
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{
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u8 buf[MAX_RTC_BYTES];
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int reg, len, ret, r;
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if (argc < 2 || argc > 3)
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return CMD_RET_USAGE;
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reg = simple_strtoul(argv[0], NULL, 16);
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len = simple_strtoul(argv[1], NULL, 16);
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if (argc == 3) {
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u8 *addr;
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addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
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ret = dm_rtc_read(dev, reg, addr, len);
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unmap_sysmem(addr);
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if (ret) {
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printf("dm_rtc_read() failed: %d\n", ret);
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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while (len) {
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r = min_t(int, len, sizeof(buf));
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ret = dm_rtc_read(dev, reg, buf, r);
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if (ret) {
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printf("dm_rtc_read() failed: %d\n", ret);
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return CMD_RET_FAILURE;
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}
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print_buffer(reg, buf, 1, r, 0);
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len -= r;
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reg += r;
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}
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return CMD_RET_SUCCESS;
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}
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static int do_rtc_write(struct udevice *dev, int argc, char * const argv[])
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{
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u8 buf[MAX_RTC_BYTES];
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int reg, len, ret;
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const char *s;
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int slen;
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if (argc < 2 || argc > 3)
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return CMD_RET_USAGE;
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reg = simple_strtoul(argv[0], NULL, 16);
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if (argc == 3) {
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u8 *addr;
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len = simple_strtoul(argv[1], NULL, 16);
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addr = map_sysmem(simple_strtoul(argv[2], NULL, 16), len);
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ret = dm_rtc_write(dev, reg, addr, len);
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unmap_sysmem(addr);
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if (ret) {
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printf("dm_rtc_write() failed: %d\n", ret);
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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s = argv[1];
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slen = strlen(s);
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if (slen % 2) {
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printf("invalid hex string\n");
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return CMD_RET_FAILURE;
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}
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while (slen) {
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len = min_t(int, slen / 2, sizeof(buf));
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if (hex2bin(buf, s, len)) {
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printf("invalid hex string\n");
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return CMD_RET_FAILURE;
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}
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ret = dm_rtc_write(dev, reg, buf, len);
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if (ret) {
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printf("dm_rtc_write() failed: %d\n", ret);
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return CMD_RET_FAILURE;
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}
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s += 2 * len;
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slen -= 2 * len;
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}
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return CMD_RET_SUCCESS;
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}
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int do_rtc(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
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{
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static int curr_rtc;
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struct udevice *dev;
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int ret, idx;
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if (argc < 2)
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return CMD_RET_USAGE;
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argc--;
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argv++;
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if (!strcmp(argv[0], "list")) {
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struct uclass *uc;
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idx = 0;
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uclass_id_foreach_dev(UCLASS_RTC, dev, uc) {
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printf("RTC #%d - %s\n", idx++, dev->name);
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}
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if (!idx) {
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printf("*** no RTC devices available ***\n");
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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idx = curr_rtc;
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if (!strcmp(argv[0], "dev") && argc >= 2)
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idx = simple_strtoul(argv[1], NULL, 10);
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ret = uclass_get_device(UCLASS_RTC, idx, &dev);
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if (ret) {
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printf("Cannot find RTC #%d: err=%d\n", idx, ret);
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return CMD_RET_FAILURE;
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}
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if (!strcmp(argv[0], "dev")) {
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/* Show the existing or newly selected RTC */
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if (argc >= 2)
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curr_rtc = idx;
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printf("RTC #%d - %s\n", idx, dev->name);
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return CMD_RET_SUCCESS;
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}
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if (!strcmp(argv[0], "read"))
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return do_rtc_read(dev, argc - 1, argv + 1);
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if (!strcmp(argv[0], "write"))
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return do_rtc_write(dev, argc - 1, argv + 1);
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return CMD_RET_USAGE;
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}
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U_BOOT_CMD(
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rtc, 5, 0, do_rtc,
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"RTC subsystem",
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"list - show available rtc devices\n"
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"rtc dev [n] - show or set current rtc device\n"
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"rtc read <reg> <count> - read and display 8-bit registers starting at <reg>\n"
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"rtc read <reg> <count> <addr> - read 8-bit registers starting at <reg> to memory <addr>\n"
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"rtc write <reg> <hexstring> - write 8-bit registers starting at <reg>\n"
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"rtc write <reg> <count> <addr> - write from memory <addr> to 8-bit registers starting at <reg>\n"
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);
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