diff options
Diffstat (limited to 'sys/arm/ti/clk/clock_common.c')
-rw-r--r-- | sys/arm/ti/clk/clock_common.c | 152 |
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); +} |