Differential D32294 Diff 100919 sys/arm/mv/clk/a37x0_periph_clk_driver.c

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sys/arm/mv/clk/a37x0_periph_clk_driver.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2021 Semihalf.
				*
				* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/bus.h>
				#include <sys/kernel.h>
				#include <sys/module.h>
				#include <sys/mutex.h>
				#include <sys/rman.h>
				#include <machine/bus.h>

				#include <dev/fdt/simplebus.h>

				#include <dev/extres/clk/clk.h>
				#include <dev/extres/clk/clk_fixed.h>

				#include <dev/ofw/ofw_bus.h>
				#include <dev/ofw/ofw_bus_subr.h>

				#include "clkdev_if.h"
				#include "periph.h"

				#define TBG_COUNT 4
				#define XTAL_OFW_INDEX 4

				static struct resource_spec a37x0_periph_clk_spec[] = {
				{ SYS_RES_MEMORY, 0, RF_ACTIVE },
				{ -1, 0 }
				};

				int
				a37x0_periph_clk_attach(device_t dev)
				{
				struct a37x0_periph_clknode_def *dev_defs;
				struct a37x0_periph_clk_softc *sc;
				const char *tbg_clocks[5];
				const char *xtal_clock;
				phandle_t node;
				int error, i;
				clk_t clock;

				sc = device_get_softc(dev);
				node = ofw_bus_get_node(dev);
				sc->dev = dev;

				mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);

				if (bus_alloc_resources(dev, a37x0_periph_clk_spec, &sc->res) != 0) {
				device_printf(dev, "Cannot allocate resources\n");
				return (ENXIO);
				}

				sc->clkdom = clkdom_create(dev);
				if (sc->clkdom == NULL) {
				device_printf(dev, "Cannot create clock domain\n");
				return (ENXIO);
				}

				for (i = 0; i < TBG_COUNT; i++){
				error = clk_get_by_ofw_index(dev, node, i, &clock);
				if (error)
				goto fail;
				tbg_clocks[i] = clk_get_name(clock);
				}

				error = clk_get_by_ofw_index(dev, node, XTAL_OFW_INDEX, &clock);
				if (error)
				goto fail;
				xtal_clock = clk_get_name(clock);

				dev_defs = sc->devices;

				for (i = 0; i< sc->device_count; i++) {
				dev_defs[i].common_def.tbgs = tbg_clocks;
				dev_defs[i].common_def.xtal = xtal_clock;
				dev_defs[i].common_def.tbg_cnt = TBG_COUNT;
				switch (dev_defs[i].type) {
				case CLK_FULL_DD:
				error = a37x0_periph_d_register_full_clk_dd(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_FULL:
				error = a37x0_periph_d_register_full_clk(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_GATE:
				error = a37x0_periph_gate_register_gate(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_MUX_GATE:
				error = a37x0_periph_register_mux_gate(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_FIXED:
				error = a37x0_periph_fixed_register_fixed(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_CPU:
				error = a37x0_periph_d_register_periph_cpu(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_MDD:
				error = a37x0_periph_d_register_mdd(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				case CLK_MUX_GATE_FIXED:
				error = a37x0_periph_register_mux_gate_fixed(
				sc->clkdom, &dev_defs[i]);
				if (error)
				goto fail;
				break;

				default:
				return (ENXIO);
				}
				}

				error = clkdom_finit(sc->clkdom);
				if (error)
				goto fail;

				if (bootverbose)
				clkdom_dump(sc->clkdom);

				return (0);

				fail:
				bus_release_resources(dev, a37x0_periph_clk_spec, &sc->res);

				return (error);

				}

				int
				a37x0_periph_clk_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
				{
				struct a37x0_periph_clk_softc *sc;

				sc = device_get_softc(dev);
				*val = bus_read_4(sc->res, addr);

				return (0);
				}

				void
				a37x0_periph_clk_device_lock(device_t dev)
				{
				struct a37x0_periph_clk_softc *sc;

				sc = device_get_softc(dev);
				mtx_lock(&sc->mtx);
				}

				void
				a37x0_periph_clk_device_unlock(device_t dev)
				{
				struct a37x0_periph_clk_softc *sc;

				sc = device_get_softc(dev);
				mtx_unlock(&sc->mtx);
				}

				int
				a37x0_periph_clk_detach(device_t dev)
				{

				return (EBUSY);
				}