add35ed5b8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
176 lines
4.8 KiB
C
176 lines
4.8 KiB
C
/*-
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* Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Simple clock driver for Allwinner A10 */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include "a10_clk.h"
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struct a10_ccm_softc {
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struct resource *res;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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};
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static struct a10_ccm_softc *a10_ccm_sc = NULL;
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#define ccm_read_4(sc, reg) \
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bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
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#define ccm_write_4(sc, reg, val) \
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bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
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static int
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a10_ccm_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_is_compatible(dev, "allwinner,sun4i-ccm")) {
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device_set_desc(dev, "Allwinner Clock Control Module");
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return(BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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a10_ccm_attach(device_t dev)
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{
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struct a10_ccm_softc *sc = device_get_softc(dev);
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int rid = 0;
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if (a10_ccm_sc)
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return (ENXIO);
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sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (!sc->res) {
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device_printf(dev, "could not allocate resource\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->res);
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sc->bsh = rman_get_bushandle(sc->res);
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a10_ccm_sc = sc;
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return (0);
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}
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static device_method_t a10_ccm_methods[] = {
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DEVMETHOD(device_probe, a10_ccm_probe),
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DEVMETHOD(device_attach, a10_ccm_attach),
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{ 0, 0 }
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};
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static driver_t a10_ccm_driver = {
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"a10_ccm",
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a10_ccm_methods,
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sizeof(struct a10_ccm_softc),
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};
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static devclass_t a10_ccm_devclass;
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DRIVER_MODULE(a10_ccm, simplebus, a10_ccm_driver, a10_ccm_devclass, 0, 0);
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int
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a10_clk_usb_activate(void)
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{
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struct a10_ccm_softc *sc = a10_ccm_sc;
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uint32_t reg_value;
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if (sc == NULL)
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return ENXIO;
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/* Gating AHB clock for USB */
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reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
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reg_value |= CCM_AHB_GATING_USB0; /* AHB clock gate usb0 */
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reg_value |= CCM_AHB_GATING_EHCI0; /* AHB clock gate ehci1 */
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reg_value |= CCM_AHB_GATING_EHCI1; /* AHB clock gate ehci1 */
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ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
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/* Enable clock for USB */
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reg_value = ccm_read_4(sc, CCM_USB_CLK);
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reg_value |= CCM_USB_PHY; /* USBPHY */
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reg_value |= CCM_USB0_RESET; /* disable reset for USB0 */
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reg_value |= CCM_USB1_RESET; /* disable reset for USB1 */
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reg_value |= CCM_USB2_RESET; /* disable reset for USB2 */
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ccm_write_4(sc, CCM_USB_CLK, reg_value);
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return (0);
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}
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int
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a10_clk_usb_deactivate(void)
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{
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struct a10_ccm_softc *sc = a10_ccm_sc;
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uint32_t reg_value;
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if (sc == NULL)
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return ENXIO;
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/* Disable clock for USB */
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reg_value = ccm_read_4(sc, CCM_USB_CLK);
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reg_value &= ~CCM_USB_PHY; /* USBPHY */
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reg_value &= ~CCM_USB0_RESET; /* reset for USB0 */
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reg_value &= ~CCM_USB1_RESET; /* reset for USB1 */
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reg_value &= ~CCM_USB2_RESET; /* reset for USB2 */
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ccm_write_4(sc, CCM_USB_CLK, reg_value);
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/* Disable gating AHB clock for USB */
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reg_value = ccm_read_4(sc, CCM_AHB_GATING0);
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reg_value &= ~CCM_AHB_GATING_USB0; /* disable AHB clock gate usb0 */
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reg_value &= ~CCM_AHB_GATING_EHCI1; /* disable AHB clock gate ehci1 */
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ccm_write_4(sc, CCM_AHB_GATING0, reg_value);
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return (0);
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}
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