Differential D32293 Diff 100918 sys/arm/mv/clk/a37x0_tbg.c

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sys/arm/mv/clk/a37x0_tbg.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/rman.h>
				#include <machine/bus.h>

				#include <dev/extres/clk/clk.h>
				#include <dev/ofw/ofw_bus_subr.h>

				#include "clkdev_if.h"

				#include "a37x0_tbg_pll.h"

				#define NUM_TBG 4

				#define TBG_CTRL0 0x4
				#define TBG_CTRL1 0x8
				#define TBG_CTRL7 0x20
				#define TBG_CTRL8 0x30

				#define TBG_MASK 0x1FF

				#define TBG_A_REFDIV 0
				#define TBG_B_REFDIV 16

				#define TBG_A_FBDIV 2
				#define TBG_B_FBDIV 18

				#define TBG_A_VCODIV_SEL 0
				#define TBG_B_VCODIV_SEL 16

				#define TBG_A_VCODIV_DIFF 1
				#define TBG_B_VCODIV_DIFF 17

				struct a37x0_tbg_softc {
				device_t dev;
				struct clkdom *clkdom;
				struct resource *res;
				};

				static struct resource_spec a37x0_tbg_clk_spec[] = {
				{ SYS_RES_MEMORY, 0, RF_ACTIVE },
				{ -1, 0 }
				};

				struct a37x0_tbg_def {
				char *name;
				uint32_t refdiv_shift;
				uint32_t fbdiv_shift;
				uint32_t vcodiv_offset;
				uint32_t vcodiv_shift;
				uint32_t tbg_bypass_en;
				};

				static const struct a37x0_tbg_def tbg[NUM_TBG] = {
				{"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF, 9},
				{"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8,
				TBG_B_VCODIV_DIFF, 25},
				{"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SEL, 9},
				{"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SEL, 25}
				};

				static devclass_t a37x0_tbg_devclass;

				static int a37x0_tbg_read_4(device_t, bus_addr_t, uint32_t *);
				static int a37x0_tbg_attach(device_t);
				static int a37x0_tbg_detach(device_t);
				static int a37x0_tbg_probe(device_t);

				static device_method_t a37x0_tbg_methods [] = {
				DEVMETHOD(device_attach, a37x0_tbg_attach),
				DEVMETHOD(device_detach, a37x0_tbg_detach),
				DEVMETHOD(device_probe, a37x0_tbg_probe),

				DEVMETHOD(clkdev_read_4, a37x0_tbg_read_4),

				DEVMETHOD_END
				};

				static driver_t a37x0_tbg_driver = {
				"a37x0_tbg",
				a37x0_tbg_methods,
				sizeof(struct a37x0_tbg_softc)
				};

				EARLY_DRIVER_MODULE(a37x0_tbg, simplebus, a37x0_tbg_driver,
				a37x0_tbg_devclass, 0, 0, BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);

				static int
				a37x0_tbg_read_4(device_t dev, bus_addr_t offset, uint32_t *val)
				{
				struct a37x0_tbg_softc *sc;

				sc = device_get_softc(dev);

				*val = bus_read_4(sc->res, offset);

				return (0);
				}

				static int
				a37x0_tbg_attach(device_t dev)
				{
				struct a37x0_tbg_pll_clk_def def;
				struct a37x0_tbg_softc *sc;
				const char *clkname;
				int error, i;
				phandle_t node;
				clk_t clock;

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

				if (bus_alloc_resources(dev, a37x0_tbg_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);
				}

				error = clk_get_by_ofw_index(dev, node, 0, &clock);
				if (error != 0) {
				device_printf(dev, "Cannot find clock parent\n");
				bus_release_resources(dev, a37x0_tbg_clk_spec, &sc->res);
				return (error);
				}

				clkname = clk_get_name(clock);

				for (i = 0; i < NUM_TBG; i++) {
				def.clkdef.parent_names = &clkname;
				def.clkdef.parent_cnt = 1;
				def.clkdef.id = i;
				def.clkdef.name = tbg[i].name;

				def.vcodiv.offset = tbg[i].vcodiv_offset;
				def.vcodiv.shift = tbg[i].vcodiv_shift;
				def.refdiv.offset = TBG_CTRL7;
				def.refdiv.shift = tbg[i].refdiv_shift;
				def.fbdiv.offset = TBG_CTRL0;
				def.fbdiv.shift = tbg[i].fbdiv_shift;
				def.vcodiv.mask = def.refdiv.mask = def.fbdiv.mask = TBG_MASK;
				def.tbg_bypass.offset = TBG_CTRL1;
				def.tbg_bypass.shift = tbg[i].tbg_bypass_en;
				def.tbg_bypass.mask = 0x1;

				error = a37x0_tbg_pll_clk_register(sc->clkdom, &def);

				if (error) {
				device_printf(dev, "Cannot register clock node\n");
				bus_release_resources(dev, a37x0_tbg_clk_spec,
				&sc->res);
				return (ENXIO);
				}
				}

				error = clkdom_finit(sc->clkdom);
				if (error) {
				device_printf(dev,
				"Cannot finalize clock domain intialization\n");
				bus_release_resources(dev, a37x0_tbg_clk_spec, &sc->res);
				return (ENXIO);
				}

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

				return (0);
				}

				static int
				a37x0_tbg_probe(device_t dev)
				{

				if (!ofw_bus_status_okay(dev))
				return (ENXIO);

				if (!ofw_bus_is_compatible(dev, "marvell,armada-3700-tbg-clock"))
				return (ENXIO);

				device_set_desc(dev, "Marvell Armada 3700 time base generators");
				return (BUS_PROBE_DEFAULT);
				}

				static int
				a37x0_tbg_detach(device_t dev)
				{

				return (EBUSY);
				}