diff options
Diffstat (limited to 'sys/arm/allwinner/clk/aw_usbclk.c')
| -rw-r--r-- | sys/arm/allwinner/clk/aw_usbclk.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/sys/arm/allwinner/clk/aw_usbclk.c b/sys/arm/allwinner/clk/aw_usbclk.c new file mode 100644 index 0000000..bac9991 --- /dev/null +++ b/sys/arm/allwinner/clk/aw_usbclk.c @@ -0,0 +1,246 @@ +/*- + * 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 USB clocks + */ + +#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/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> +#include <dev/ofw/ofw_subr.h> + +#include <dev/extres/clk/clk_gate.h> +#include <dev/extres/hwreset/hwreset.h> + +#include "clkdev_if.h" +#include "hwreset_if.h" + +#define A10_SCLK_GATING_USBPHY (1 << 8) +#define A10_SCLK_GATING_OHCI1 (1 << 7) +#define A10_SCLK_GATING_OHCI0 (1 << 6) + +#define USBPHY2_RST (1 << 2) +#define USBPHY1_RST (1 << 1) +#define USBPHY0_RST (1 << 0) + +enum aw_usbclk_type { + AW_A10_USBCLK = 1, + AW_A31_USBCLK, +}; + +static struct ofw_compat_data compat_data[] = { + { "allwinner,sun4i-a10-usb-clk", AW_A10_USBCLK }, + { "allwinner,sun6i-a31-usb-clk", AW_A31_USBCLK }, + { NULL, 0 } +}; + +/* Clock indices for A10, as there is no clock-indices property in the DT */ +static uint32_t aw_usbclk_indices_a10[] = { 6, 7, 8 }; + +struct aw_usbclk_softc { + bus_addr_t reg; +}; + +static int +aw_usbclk_hwreset_assert(device_t dev, intptr_t id, bool value) +{ + struct aw_usbclk_softc *sc; + uint32_t mask; + device_t pdev; + int error; + + sc = device_get_softc(dev); + pdev = device_get_parent(dev); + + mask = USBPHY0_RST << id; + + CLKDEV_DEVICE_LOCK(pdev); + error = CLKDEV_MODIFY_4(pdev, sc->reg, mask, value ? 0 : mask); + CLKDEV_DEVICE_UNLOCK(pdev); + + return (error); +} + +static int +aw_usbclk_hwreset_is_asserted(device_t dev, intptr_t id, bool *value) +{ + struct aw_usbclk_softc *sc; + uint32_t mask, val; + device_t pdev; + int error; + + sc = device_get_softc(dev); + pdev = device_get_parent(dev); + + mask = USBPHY0_RST << id; + + CLKDEV_DEVICE_LOCK(pdev); + error = CLKDEV_READ_4(pdev, sc->reg, &val); + CLKDEV_DEVICE_UNLOCK(pdev); + + if (error) + return (error); + + *value = (val & mask) != 0 ? false : true; + + return (0); +} + +static int +aw_usbclk_create(device_t dev, bus_addr_t paddr, struct clkdom *clkdom, + const char *pclkname, const char *clkname, int index) +{ + const char *parent_names[1] = { pclkname }; + struct clk_gate_def def; + + memset(&def, 0, sizeof(def)); + def.clkdef.id = index; + def.clkdef.name = clkname; + def.clkdef.parent_names = parent_names; + def.clkdef.parent_cnt = 1; + def.offset = paddr; + def.shift = index; + def.mask = 1; + def.on_value = 1; + def.off_value = 0; + + return (clknode_gate_register(clkdom, &def)); +} + +static int +aw_usbclk_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, "Allwinner USB Clocks"); + return (BUS_PROBE_DEFAULT); +} + +static int +aw_usbclk_attach(device_t dev) +{ + struct aw_usbclk_softc *sc; + struct clkdom *clkdom; + const char **names; + int index, nout, error; + enum aw_usbclk_type type; + uint32_t *indices; + clk_t clk_parent; + bus_size_t psize; + phandle_t node; + + sc = device_get_softc(dev); + node = ofw_bus_get_node(dev); + indices = NULL; + type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; + + if (ofw_reg_to_paddr(node, 0, &sc->reg, &psize, NULL) != 0) { + device_printf(dev, "cannot parse 'reg' property\n"); + return (ENXIO); + } + + clkdom = clkdom_create(dev); + + nout = clk_parse_ofw_out_names(dev, node, &names, &indices); + if (nout == 0) { + device_printf(dev, "no clock outputs found\n"); + error = ENOENT; + goto fail; + } + + if (indices == NULL && type == AW_A10_USBCLK) + indices = aw_usbclk_indices_a10; + + error = clk_get_by_ofw_index(dev, 0, &clk_parent); + if (error != 0) { + device_printf(dev, "cannot parse clock parent\n"); + return (ENXIO); + } + + for (index = 0; index < nout; index++) { + error = aw_usbclk_create(dev, sc->reg, clkdom, + clk_get_name(clk_parent), names[index], + indices != NULL ? indices[index] : index); + if (error) + goto fail; + } + + if (clkdom_finit(clkdom) != 0) { + device_printf(dev, "cannot finalize clkdom initialization\n"); + error = ENXIO; + goto fail; + } + + if (bootverbose) + clkdom_dump(clkdom); + + hwreset_register_ofw_provider(dev); + + return (0); + +fail: + return (error); +} + +static device_method_t aw_usbclk_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, aw_usbclk_probe), + DEVMETHOD(device_attach, aw_usbclk_attach), + + /* Reset interface */ + DEVMETHOD(hwreset_assert, aw_usbclk_hwreset_assert), + DEVMETHOD(hwreset_is_asserted, aw_usbclk_hwreset_is_asserted), + + DEVMETHOD_END +}; + +static driver_t aw_usbclk_driver = { + "aw_usbclk", + aw_usbclk_methods, + sizeof(struct aw_usbclk_softc) +}; + +static devclass_t aw_usbclk_devclass; + +EARLY_DRIVER_MODULE(aw_usbclk, simplebus, aw_usbclk_driver, + aw_usbclk_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); |
