blob: 6d79da09518278bd3ac46f7942a5b14d4a1535ae [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
#include <fidl/fuchsia.hardware.clock/cpp/wire.h>
#include <getopt.h>
#include <lib/fdio/directory.h>
#include <libgen.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <fbl/unique_fd.h>
using FrequencyInfo = fuchsia_hardware_clock::wire::FrequencyInfo;
typedef enum action {
UNKNOWN,
MEASURE,
ENABLE,
DISABLE,
} action_t;
int usage(const char* cmd) {
fprintf(stderr,
"\nInteract with clocks on the SOC:\n"
" %s measure Measures all clock values\n"
" %s measure -idx <idx> Measure CLK idx\n"
" %s enable -idx <idx> Enable clock idx\n"
" %s disable -idx <idx> Disable clock idx\n"
" %s help Print this message\n",
cmd, cmd, cmd, cmd, cmd);
return -1;
}
// Returns "true" if the argument matches the prefix.
// In this case, moves the argument past the prefix.
bool prefix_match(const char** arg, const char* prefix) {
if (!strncmp(*arg, prefix, strlen(prefix))) {
*arg += strlen(prefix);
return true;
}
return false;
}
// Gets the value of a particular field passed through
// command line.
const char* getValue(int argc, char** argv, const char* field) {
int i = 1;
while (i < argc - 1 && strcmp(argv[i], field) != 0) {
++i;
}
if (i >= argc - 1) {
printf("NULL\n");
return NULL;
} else {
return argv[i + 1];
}
}
char* guess_dev(void) {
char path[26]; // strlen("/dev/class/clock-impl/###") + 1
DIR* d = opendir("/dev/class/clock-impl");
if (!d) {
return NULL;
}
struct dirent* de;
while ((de = readdir(d)) != NULL) {
if (strlen(de->d_name) != 3) {
continue;
}
if (isdigit(de->d_name[0]) && isdigit(de->d_name[1]) && isdigit(de->d_name[2])) {
sprintf(path, "/dev/class/clock-impl/%.3s", de->d_name);
closedir(d);
return strdup(path);
}
}
closedir(d);
return NULL;
}
ssize_t measure_clk_util(fidl::WireSyncClient<fuchsia_hardware_clock::Device>& client,
uint32_t idx) {
auto measure_result = client->Measure(idx);
if (!measure_result.ok()) {
fprintf(stderr, "Failed to measure clock: %s\n", zx_status_get_string(measure_result.status()));
return -1;
}
auto result = client->Measure(idx);
if (!result.ok()) {
fprintf(stderr, "ERROR: failed to measure clock: %d\n", result.status());
return -1;
}
std::string name(std::begin(result->info.name), std::end(result->info.name));
printf("[%4d][%4ld MHz] %s\n", idx, result->info.frequency, name.c_str());
return 0;
}
ssize_t measure_clk(const char* path, uint32_t idx, bool clk) {
fbl::unique_fd device(open(path, O_RDWR));
if (!device.is_valid()) {
fprintf(stderr, "Failed to open clock device: %s\n", strerror(errno));
return -1;
}
fidl::ClientEnd<fuchsia_hardware_clock::Device> client_end;
zx_status_t st =
fdio_get_service_handle(device.release(), client_end.channel().reset_and_get_address());
if (st != ZX_OK) {
fprintf(stderr, "Failed to get service handle: %s\n", zx_status_get_string(st));
return -1;
}
fidl::WireSyncClient<fuchsia_hardware_clock::Device> client(std::move(client_end));
auto clk_count_result = client->GetCount();
if (!clk_count_result.ok()) {
fprintf(stderr, "Failed to get count: %s\n", zx_status_get_string(clk_count_result.status()));
return -1;
}
if (clk) {
if (idx > clk_count_result->count) {
fprintf(stderr, "ERROR: Invalid clock index.\n");
return -1;
}
return measure_clk_util(client, idx);
} else {
for (uint32_t i = 0; i < clk_count_result->count; i++) {
ssize_t rc = measure_clk_util(client, i);
if (rc < 0) {
return rc;
}
}
}
return 0;
}
ssize_t toggle_clk(const char* path, uint32_t idx, action_t subcmd) {
if (subcmd != ENABLE && subcmd != DISABLE) {
return -1;
}
fbl::unique_fd device(open(path, O_RDWR));
if (!device.is_valid()) {
fprintf(stderr, "Failed to open clock device: %s\n", strerror(errno));
return -1;
}
fidl::ClientEnd<fuchsia_hardware_clock::Device> client_end;
zx_status_t st =
fdio_get_service_handle(device.release(), client_end.channel().reset_and_get_address());
if (st != ZX_OK) {
fprintf(stderr, "Failed to get service handle: %s\n", zx_status_get_string(st));
return -1;
}
fidl::WireSyncClient<fuchsia_hardware_clock::Device> client(std::move(client_end));
if (subcmd == ENABLE) {
auto en_result = client->Enable(idx);
if (!en_result.ok()) {
fprintf(stderr, "ERROR: Failed to enable clock: %s\n",
zx_status_get_string(en_result.status()));
return -1;
}
} else if (subcmd == DISABLE) {
auto dis_result = client->Disable(idx);
if (!dis_result.ok()) {
fprintf(stderr, "ERROR: Failed to disable clock: %s\n",
zx_status_get_string(dis_result.status()));
return -1;
}
} else {
fprintf(stderr, "ERROR: Unknown command\n");
return -1;
}
return 0;
}
int main(int argc, char** argv) {
const char* cmd = basename(argv[0]);
char* path = NULL;
const char* index = NULL;
action_t subcmd = UNKNOWN;
bool clk = false;
uint32_t idx = 0;
// If no arguments passed, bail out after dumping
// usage information.
if (argc == 1) {
return usage(cmd);
}
// Parse all args.
while (argc > 1) {
const char* arg = argv[1];
if (prefix_match(&arg, "measure")) {
subcmd = MEASURE;
} else if (prefix_match(&arg, "enable")) {
subcmd = ENABLE;
} else if (prefix_match(&arg, "disable")) {
subcmd = DISABLE;
}
if (prefix_match(&arg, "-idx")) {
index = getValue(argc, argv, "-idx");
clk = true;
if (index) {
idx = atoi(index);
} else {
fprintf(stderr, "Enter Valid CLK IDX.\n");
}
}
if (prefix_match(&arg, "help")) {
return usage(cmd);
}
argc--;
argv++;
}
// Get the device path.
path = guess_dev();
if (!path) {
fprintf(stderr, "No CLK device found.\n");
return usage(cmd);
}
ssize_t err;
switch (subcmd) {
case MEASURE:
err = measure_clk(path, idx, clk);
if (err) {
printf("Measure CLK failed.\n");
}
break;
case ENABLE:
__FALLTHROUGH;
case DISABLE:
if (!clk) {
printf("-idx argument is required.\n");
return -1;
}
err = toggle_clk(path, idx, subcmd);
if (err) {
printf("Clock Toggle failed\n");
}
break;
default:
return usage(cmd);
}
return 0;
}