--- /dev/null
+/* $OpenBSD: ofw_clock.c,v 1.1 2016/08/21 21:38:05 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)
+{
+ 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], 1);
+}
+
+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_enable_idx(int node, int idx)
+{
+ 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);
+ break;
+ }
+ clock = clock_next_clock(clock);
+ idx--;
+ }
+
+ free(clocks, M_TEMP, len);
+}
+
+void
+clock_enable(int node, const char *name)
+{
+ int idx;
+
+ idx = clock_index(node, name);
+ if (idx == -1)
+ return;
+
+ clock_enable_idx(node, idx);
+}
--- /dev/null
+/* $OpenBSD: ofw_clock.h,v 1.1 2016/08/21 21:38:05 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.
+ */
+
+#ifndef _DEV_OFW_CLOCK_H_
+#define _DEV_OFW_CLOCK_H_
+
+struct clock_device {
+ int cd_node;
+ void *cd_cookie;
+ uint32_t (*cd_get_frequency)(void *, uint32_t *);
+ void (*cd_enable)(void *, uint32_t *, int);
+
+ LIST_ENTRY(clock_device) cd_list;
+ uint32_t cd_phandle;
+ uint32_t cd_cells;
+};
+
+void clock_register(struct clock_device *);
+
+uint32_t clock_get_frequency(int, const char *);
+uint32_t clock_get_frequency_idx(int, int);
+void clock_enable(int, const char *);
+void clock_enable_idx(int, int);
+
+#endif /* _DEV_OFW_CLOCK_H_ */
projects / openbsd / commitdiff