diff options
Diffstat (limited to 'sys/arm/allwinner/aw_ccu.c')
| -rw-r--r-- | sys/arm/allwinner/aw_ccu.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/sys/arm/allwinner/aw_ccu.c b/sys/arm/allwinner/aw_ccu.c new file mode 100644 index 0000000..d2ce774 --- /dev/null +++ b/sys/arm/allwinner/aw_ccu.c @@ -0,0 +1,224 @@ +/*- + * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> + * All rights reserved. + * + * 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. + * + * $FreeBSD$ + */ + +/* + * Allwinner oscillator clock + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/rman.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <machine/bus.h> + +#include <dev/fdt/simplebus.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <dev/extres/clk/clk.h> + +#include "clkdev_if.h" + +#define CCU_BASE 0x01c20000 +#define CCU_SIZE 0x400 + +struct aw_ccu_softc { + struct simplebus_softc sc; + bus_space_tag_t bst; + bus_space_handle_t bsh; + struct mtx mtx; +}; + +static struct ofw_compat_data compat_data[] = { + { "allwinner,sun4i-a10", 1 }, + { "allwinner,sun7i-a20", 1 }, + { "allwinner,sun6i-a31", 1 }, + { "allwinner,sun6i-a31s", 1 }, + { NULL, 0 } +}; + +static int +aw_ccu_check_addr(bus_addr_t addr) +{ + if (addr < CCU_BASE || addr >= (CCU_BASE + CCU_SIZE)) + return (EINVAL); + return (0); +} + +static int +aw_ccu_write_4(device_t dev, bus_addr_t addr, uint32_t val) +{ + struct aw_ccu_softc *sc; + + if (aw_ccu_check_addr(addr) != 0) + return (EINVAL); + + sc = device_get_softc(dev); + mtx_assert(&sc->mtx, MA_OWNED); + bus_space_write_4(sc->bst, sc->bsh, addr - CCU_BASE, val); + + return (0); +} + +static int +aw_ccu_read_4(device_t dev, bus_addr_t addr, uint32_t *val) +{ + struct aw_ccu_softc *sc; + + if (aw_ccu_check_addr(addr) != 0) + return (EINVAL); + + sc = device_get_softc(dev); + mtx_assert(&sc->mtx, MA_OWNED); + *val = bus_space_read_4(sc->bst, sc->bsh, addr - CCU_BASE); + + return (0); +} + +static int +aw_ccu_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set) +{ + struct aw_ccu_softc *sc; + uint32_t val; + + if (aw_ccu_check_addr(addr) != 0) + return (EINVAL); + + sc = device_get_softc(dev); + mtx_assert(&sc->mtx, MA_OWNED); + val = bus_space_read_4(sc->bst, sc->bsh, addr - CCU_BASE); + val &= ~clr; + val |= set; + bus_space_write_4(sc->bst, sc->bsh, addr - CCU_BASE, val); + + return (0); +} + +static void +aw_ccu_device_lock(device_t dev) +{ + struct aw_ccu_softc *sc; + + sc = device_get_softc(dev); + mtx_lock(&sc->mtx); +} + +static void +aw_ccu_device_unlock(device_t dev) +{ + struct aw_ccu_softc *sc; + + sc = device_get_softc(dev); + mtx_unlock(&sc->mtx); +} + +static int +aw_ccu_probe(device_t dev) +{ + const char *name; + device_t pdev; + + name = ofw_bus_get_name(dev); + + if (name == NULL || strcmp(name, "clocks") != 0) + return (ENXIO); + + pdev = device_get_parent(dev); + if (ofw_bus_search_compatible(pdev, compat_data)->ocd_data == 0) + return (0); + + device_set_desc(dev, "Allwinner Clock Control Unit"); + return (BUS_PROBE_SPECIFIC); +} + +static int +aw_ccu_attach(device_t dev) +{ + struct aw_ccu_softc *sc; + phandle_t node, child; + device_t cdev; + int error; + + sc = device_get_softc(dev); + node = ofw_bus_get_node(dev); + + simplebus_init(dev, node); + + /* + * Map CCU registers. The DT doesn't have a "reg" property for the + * /clocks node and child nodes have conflicting "reg" properties. + */ + sc->bst = bus_get_bus_tag(dev); + error = bus_space_map(sc->bst, CCU_BASE, CCU_SIZE, 0, &sc->bsh); + if (error != 0) { + device_printf(dev, "couldn't map CCU: %d\n", error); + return (error); + } + + mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF); + + /* Attach child devices */ + for (child = OF_child(node); child > 0; child = OF_peer(child)) { + cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL); + if (cdev != NULL) + device_probe_and_attach(cdev); + } + + return (bus_generic_attach(dev)); +} + +static device_method_t aw_ccu_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, aw_ccu_probe), + DEVMETHOD(device_attach, aw_ccu_attach), + + /* clkdev interface */ + DEVMETHOD(clkdev_write_4, aw_ccu_write_4), + DEVMETHOD(clkdev_read_4, aw_ccu_read_4), + DEVMETHOD(clkdev_modify_4, aw_ccu_modify_4), + DEVMETHOD(clkdev_device_lock, aw_ccu_device_lock), + DEVMETHOD(clkdev_device_unlock, aw_ccu_device_unlock), + + DEVMETHOD_END +}; + +DEFINE_CLASS_1(aw_ccu, aw_ccu_driver, aw_ccu_methods, + sizeof(struct aw_ccu_softc), simplebus_driver); + +static devclass_t aw_ccu_devclass; + +EARLY_DRIVER_MODULE(aw_ccu, simplebus, aw_ccu_driver, aw_ccu_devclass, + 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); + +MODULE_VERSION(aw_ccu, 1); |
