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-rw-r--r--sys/arm/ti/clk/clock_common.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/sys/arm/ti/clk/clock_common.c b/sys/arm/ti/clk/clock_common.c
new file mode 100644
index 000000000000..15b0e75a8a1e
--- /dev/null
+++ b/sys/arm/ti/clk/clock_common.c
@@ -0,0 +1,152 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/systm.h>
+#include <sys/libkern.h>
+#include <sys/types.h>
+#include <sys/malloc.h>
+
+#include <machine/bus.h>
+#include <dev/fdt/simplebus.h>
+
+#include <dev/extres/clk/clk_mux.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "clock_common.h"
+
+#if 0
+#define DPRINTF(dev, msg...) device_printf(dev, msg)
+#else
+#define DPRINTF(dev, msg...)
+#endif
+
+void
+read_clock_cells(device_t dev, struct clock_cell_info *clk) {
+ ssize_t numbytes_clocks;
+ phandle_t node, parent, *cells;
+ int index, ncells, rv;
+
+ node = ofw_bus_get_node(dev);
+
+ /* Get names of parent clocks */
+ numbytes_clocks = OF_getproplen(node, "clocks");
+ clk->num_clock_cells = numbytes_clocks / sizeof(cell_t);
+
+ /* Allocate space and get clock cells content */
+ /* clock_cells / clock_cells_ncells will be freed in
+ * find_parent_clock_names()
+ */
+ clk->clock_cells = malloc(numbytes_clocks, M_DEVBUF, M_WAITOK|M_ZERO);
+ clk->clock_cells_ncells = malloc(clk->num_clock_cells*sizeof(uint8_t),
+ M_DEVBUF, M_WAITOK|M_ZERO);
+ OF_getencprop(node, "clocks", clk->clock_cells, numbytes_clocks);
+
+ /* Count number of clocks */
+ clk->num_real_clocks = 0;
+ for (index = 0; index < clk->num_clock_cells; index++) {
+ rv = ofw_bus_parse_xref_list_alloc(node, "clocks", "#clock-cells",
+ clk->num_real_clocks, &parent, &ncells, &cells);
+ if (rv != 0)
+ continue;
+
+ if (cells != NULL)
+ OF_prop_free(cells);
+
+ clk->clock_cells_ncells[index] = ncells;
+ index += ncells;
+ clk->num_real_clocks++;
+ }
+}
+
+int
+find_parent_clock_names(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
+ int index, clock_index, err;
+ bool found_all = true;
+ clk_t parent;
+
+ /* Figure out names */
+ for (index = 0, clock_index = 0; index < clk->num_clock_cells; index++) {
+ /* Get name of parent clock */
+ err = clk_get_by_ofw_index(dev, 0, clock_index, &parent);
+ if (err != 0) {
+ clock_index++;
+ found_all = false;
+ DPRINTF(dev, "Failed to find clock_cells[%d]=0x%x\n",
+ index, clk->clock_cells[index]);
+
+ index += clk->clock_cells_ncells[index];
+ continue;
+ }
+
+ def->parent_names[clock_index] = clk_get_name(parent);
+ clk_release(parent);
+
+ DPRINTF(dev, "Found parent clock[%d/%d]: %s\n",
+ clock_index, clk->num_real_clocks,
+ def->parent_names[clock_index]);
+
+ clock_index++;
+ index += clk->clock_cells_ncells[index];
+ }
+
+ if (!found_all) {
+ return 1;
+ }
+
+ free(clk->clock_cells, M_DEVBUF);
+ free(clk->clock_cells_ncells, M_DEVBUF);
+ return 0;
+}
+
+void
+create_clkdef(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
+ def->id = 1;
+
+ clk_parse_ofw_clk_name(dev, ofw_bus_get_node(dev), &def->name);
+
+ DPRINTF(dev, "node name: %s\n", def->name);
+
+ def->parent_cnt = clk->num_real_clocks;
+ def->parent_names = malloc(clk->num_real_clocks*sizeof(char *),
+ M_OFWPROP, M_WAITOK);
+}
+void
+free_clkdef(struct clknode_init_def *def) {
+ OF_prop_free(__DECONST(char *, def->name));
+ OF_prop_free(def->parent_names);
+}