Differential D25118 Diff 73079 sys/arm/ti/ti_scm_syscon.c

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sys/arm/ti/ti_scm_syscon.c

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				/*-
				* Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.org>
				*
				* 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.
				*
				* $FreeBSD$
				*/
				/* Based on sys/arm/ti/ti_sysc.c */

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

				#include <sys/param.h>
				#include <sys/systm.h>
				#include <sys/kernel.h>
				#include <sys/module.h>
				#include <sys/bus.h>
				#include <sys/resource.h>
				#include <sys/rman.h>
				#include <sys/lock.h>
				#include <sys/mutex.h>

				#include <machine/bus.h>
				#include <machine/resource.h>

				#include <dev/fdt/simplebus.h>

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

				#include "syscon_if.h"
				#include <dev/extres/syscon/syscon.h>
				#include "clkdev_if.h"

				#if 0
				#define DPRINTF(dev, msg...) device_printf(dev, msg)
				#else
				#define DPRINTF(dev, msg...)
				#endif

				MALLOC_DECLARE(M_SYSCON);

				struct ti_scm_syscon_softc {
				struct simplebus_softc sc_simplebus;
				device_t dev;
				struct syscon * syscon;
				struct resource * res[1];
				bus_space_tag_t bst;
				bus_space_handle_t bsh;
				struct mtx mtx;
				};

				static struct resource_spec ti_scm_syscon_res_spec[] = {
				{ SYS_RES_MEMORY, 0, RF_ACTIVE \| RF_SHAREABLE },
				{ -1, 0 }
				};

				/* Device */
				static struct ofw_compat_data compat_data[] = {
				{ "syscon", 1 },
				{ NULL, 0 }
				};

				/* --- dev/extres/syscon syscon_method_t interface --- */
				static int
				ti_scm_syscon_write_4(struct syscon *syscon, bus_size_t offset, uint32_t val)
				{
				struct ti_scm_syscon_softc *sc;

				sc = device_get_softc(syscon->pdev);
				DPRINTF(sc->dev, "offset=%lx write %x\n", offset, val);
				mtx_lock(&sc->mtx);
				bus_space_write_4(sc->bst, sc->bsh, offset, val);
				mtx_unlock(&sc->mtx);
				return (0);
				}

				static uint32_t
				ti_scm_syscon_read_4(struct syscon *syscon, bus_size_t offset)
				{
				struct ti_scm_syscon_softc *sc;
				uint32_t val;

				sc = device_get_softc(syscon->pdev);

				mtx_lock(&sc->mtx);
				val = bus_space_read_4(sc->bst, sc->bsh, offset);
				mtx_unlock(&sc->mtx);
				DPRINTF(sc->dev, "offset=%lx Read %x\n", offset, val);
				return (val);
				}
				static int
				ti_scm_syscon_modify_4(struct syscon *syscon, bus_size_t offset, uint32_t clr, uint32_t set)
				{
				struct ti_scm_syscon_softc *sc;
				uint32_t reg;

				sc = device_get_softc(syscon->pdev);

				mtx_lock(&sc->mtx);
				reg = bus_space_read_4(sc->bst, sc->bsh, offset);
				reg &= ~clr;
				reg \|= set;
				bus_space_write_4(sc->bst, sc->bsh, offset, reg);
				mtx_unlock(&sc->mtx);
				DPRINTF(sc->dev, "offset=%lx reg: %x (clr %x set %x)\n", offset, reg, clr, set);

				return (0);
				}

				static syscon_method_t ti_scm_syscon_reg_methods[] = {
				SYSCONMETHOD(syscon_read_4, ti_scm_syscon_read_4),
				SYSCONMETHOD(syscon_write_4, ti_scm_syscon_write_4),
				SYSCONMETHOD(syscon_modify_4, ti_scm_syscon_modify_4),

				SYSCONMETHOD_END
				};

				DEFINE_CLASS_1(ti_scm_syscon_reg, ti_scm_syscon_reg_class, ti_scm_syscon_reg_methods,
				0, syscon_class);

				/* device interface */
				static int
				ti_scm_syscon_probe(device_t dev)
				{
				if (!ofw_bus_status_okay(dev))
				return (ENXIO);

				if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
				return (ENXIO);

				device_set_desc(dev, "TI OMAP Control Module Syscon");
				return(BUS_PROBE_DEFAULT);
				}

				static int
				ti_scm_syscon_attach(device_t dev)
				{
				struct ti_scm_syscon_softc *sc;
				phandle_t node, child;
				int err;

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

				if (bus_alloc_resources(dev, ti_scm_syscon_res_spec, sc->res)) {
				device_printf(sc->dev, "Cant allocate resources\n");
				return (ENXIO);
				}

				sc->dev = dev;
				sc->bst = rman_get_bustag(sc->res[0]);
				sc->bsh = rman_get_bushandle(sc->res[0]);

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

				/* dev/extres/syscon interface */
				sc->syscon = syscon_create_ofw_node(dev, &ti_scm_syscon_reg_class, node);
				if (sc->syscon == NULL) {
				device_printf(dev, "Failed to create/register syscon\n");
				return (ENXIO);
				}

				simplebus_init(sc->dev, node);

				err = bus_generic_probe(sc->dev);
				for (child = OF_child(node); child != 0; child = OF_peer(child)) {
				simplebus_add_device(sc->dev, child, 0, NULL, -1, NULL);
				}

				return (bus_generic_attach(sc->dev));
				}

				/* syscon interface */
				static int
				ti_scm_syscon_get_handle(device_t dev, struct syscon **syscon)
				{
				struct ti_scm_syscon_softc *sc;

				sc = device_get_softc(dev);
				*syscon = sc->syscon;
				if (*syscon == NULL)
				return (ENODEV);
				return (0);
				}

				/* clkdev interface */
				static int
				ti_scm_syscon_clk_write_4(device_t dev, bus_addr_t addr, uint32_t val)
				{
				struct ti_scm_syscon_softc *sc;

				sc = device_get_softc(dev);
				DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val);
				bus_space_write_4(sc->bst, sc->bsh, addr, val);
				return (0);
				}

				static int
				ti_scm_syscon_clk_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
				{
				struct ti_scm_syscon_softc *sc;

				sc = device_get_softc(dev);

				*val = bus_space_read_4(sc->bst, sc->bsh, addr);
				DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, *val);
				return (0);
				}

				static int
				ti_scm_syscon_clk_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
				{
				struct ti_scm_syscon_softc *sc;
				uint32_t reg;

				sc = device_get_softc(dev);

				reg = bus_space_read_4(sc->bst, sc->bsh, addr);
				reg &= ~clr;
				reg \|= set;
				bus_space_write_4(sc->bst, sc->bsh, addr, reg);
				DPRINTF(sc->dev, "offset=%lx reg: %x (clr %x set %x)\n", addr, reg, clr, set);

				return (0);
				}

				static void
				ti_scm_syscon_clk_device_lock(device_t dev)
				{
				struct ti_scm_syscon_softc *sc;

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

				static void
				ti_scm_syscon_clk_device_unlock(device_t dev)
				{
				struct ti_scm_syscon_softc *sc;
				sc = device_get_softc(dev);
				mtx_unlock(&sc->mtx);
				}

				static device_method_t ti_scm_syscon_methods[] = {
				DEVMETHOD(device_probe, ti_scm_syscon_probe),
				DEVMETHOD(device_attach, ti_scm_syscon_attach),

				/* syscon interface */
				DEVMETHOD(syscon_get_handle, ti_scm_syscon_get_handle),

				/* clkdev interface */
				DEVMETHOD(clkdev_write_4, ti_scm_syscon_clk_write_4),
				DEVMETHOD(clkdev_read_4, ti_scm_syscon_clk_read_4),
				DEVMETHOD(clkdev_modify_4, ti_scm_syscon_clk_modify_4),
				DEVMETHOD(clkdev_device_lock, ti_scm_syscon_clk_device_lock),
				DEVMETHOD(clkdev_device_unlock, ti_scm_syscon_clk_device_unlock),

				DEVMETHOD_END
				};


				DEFINE_CLASS_1(ti_scm_syscon, ti_scm_syscon_driver, ti_scm_syscon_methods,
				sizeof(struct ti_scm_syscon_softc), simplebus_driver);

				static devclass_t ti_scm_syscon_devclass;

				EARLY_DRIVER_MODULE(ti_scm_syscon, simplebus, ti_scm_syscon_driver,
				ti_scm_syscon_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
				MODULE_VERSION(ti_scm_syscon, 1);
				MODULE_DEPEND(ti_scm_syscon, ti_scm, 1, 1, 1);