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/* $OpenBSD: ofw_clock.c,v 1.2 2016/08/22 11:23:54 kettenis Exp $ */
/*
* Copyright (c) 2016 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
LIST_HEAD(, clock_device) clock_devices =
LIST_HEAD_INITIALIZER(clock_devices);
void
clock_register(struct clock_device *cd)
{
cd->cd_cells = OF_getpropint(cd->cd_node, "#clock-cells", 0);
cd->cd_phandle = OF_getpropint(cd->cd_node, "phandle", 0);
if (cd->cd_phandle == 0)
return;
LIST_INSERT_HEAD(&clock_devices, cd, cd_list);
}
uint32_t
clock_get_frequency_cells(uint32_t *cells)
{
struct clock_device *cd;
uint32_t phandle = cells[0];
int node;
LIST_FOREACH(cd, &clock_devices, cd_list) {
if (cd->cd_phandle == phandle)
break;
}
if (cd && cd->cd_get_frequency)
return cd->cd_get_frequency(cd->cd_cookie, &cells[1]);
node = OF_getnodebyphandle(phandle);
if (node == 0)
return 0;
if (OF_is_compatible(node, "fixed-clock"))
return OF_getpropint(node, "clock-frequency", 0);
if (OF_is_compatible(node, "fixed-factor-clock")) {
uint32_t mult, div, freq;
mult = OF_getpropint(node, "clock-mult", 1);
div = OF_getpropint(node, "clock-div", 1);
freq = clock_get_frequency(node, NULL);
return (freq * mult) / div;
}
return 0;
}
void
clock_enable_cells(uint32_t *cells, int on)
{
struct clock_device *cd;
uint32_t phandle = cells[0];
LIST_FOREACH(cd, &clock_devices, cd_list) {
if (cd->cd_phandle == phandle)
break;
}
if (cd && cd->cd_enable)
cd->cd_enable(cd->cd_cookie, &cells[1], on);
}
uint32_t *
clock_next_clock(uint32_t *cells)
{
uint32_t phandle = cells[0];
int node, ncells;
node = OF_getnodebyphandle(phandle);
if (node == 0)
return NULL;
ncells = OF_getpropint(node, "#clock-cells", 0);
return cells + ncells + 1;
}
int
clock_index(int node, const char *clock)
{
char *names;
char *name;
char *end;
int idx = 0;
int len;
if (clock == NULL)
return 0;
len = OF_getproplen(node, "clock-names");
if (len <= 0)
return -1;
names = malloc(len, M_TEMP, M_WAITOK);
OF_getprop(node, "clock-names", names, len);
end = names + len;
name = names;
while (name < end) {
if (strcmp(name, clock) == 0) {
free(names, M_TEMP, len);
return idx;
}
name += strlen(name) + 1;
idx++;
}
free(names, M_TEMP, len);
return -1;
}
uint32_t
clock_get_frequency_idx(int node, int idx)
{
uint32_t *clocks;
uint32_t *clock;
uint32_t freq = 0;
int len;
len = OF_getproplen(node, "clocks");
if (len <= 0)
return 0;
clocks = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "clocks", clocks, len);
clock = clocks;
while (clock && clock < clocks + (len / sizeof(uint32_t))) {
if (idx == 0) {
freq = clock_get_frequency_cells(clock);
break;
}
clock = clock_next_clock(clock);
idx--;
}
free(clocks, M_TEMP, len);
return freq;
}
uint32_t
clock_get_frequency(int node, const char *name)
{
int idx;
idx = clock_index(node, name);
if (idx == -1)
return 0;
return clock_get_frequency_idx(node, idx);
}
void
clock_do_enable_idx(int node, int idx, int on)
{
uint32_t *clocks;
uint32_t *clock;
int len;
len = OF_getproplen(node, "clocks");
if (len <= 0)
return;
clocks = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "clocks", clocks, len);
clock = clocks;
while (clock && clock < clocks + (len / sizeof(uint32_t))) {
if (idx <= 0)
clock_enable_cells(clock, on);
if (idx == 0)
break;
clock = clock_next_clock(clock);
idx--;
}
free(clocks, M_TEMP, len);
}
void
clock_do_enable(int node, const char *name, int on)
{
int idx;
idx = clock_index(node, name);
if (idx == -1)
return;
clock_do_enable_idx(node, idx, on);
}
void
clock_enable_idx(int node, int idx)
{
clock_do_enable_idx(node, idx, 1);
}
void
clock_enable(int node, const char *name)
{
clock_do_enable(node, name, 1);
}
void
clock_disable_idx(int node, int idx)
{
clock_do_enable_idx(node, idx, 0);
}
void
clock_disable(int node, const char *name)
{
clock_do_enable(node, name, 0);
}
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