diff options
Diffstat (limited to 'sys/arm/ti/ti_scm_syscon.c')
| -rw-r--r-- | sys/arm/ti/ti_scm_syscon.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/sys/arm/ti/ti_scm_syscon.c b/sys/arm/ti/ti_scm_syscon.c new file mode 100644 index 000000000000..2c3fa9345210 --- /dev/null +++ b/sys/arm/ti/ti_scm_syscon.c @@ -0,0 +1,294 @@ +/*- + * 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); |