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tegra_pmc.c revision 1.3 
      1 /* $NetBSD: tegra_pmc.c,v 1.3 2015/04/26 22:04:28 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "locators.h"
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: tegra_pmc.c,v 1.3 2015/04/26 22:04:28 jmcneill Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/bus.h>
     36 #include <sys/device.h>
     37 #include <sys/intr.h>
     38 #include <sys/systm.h>
     39 #include <sys/kernel.h>
     40 
     41 #include <arm/nvidia/tegra_reg.h>
     42 #include <arm/nvidia/tegra_pmcreg.h>
     43 #include <arm/nvidia/tegra_var.h>
     44 
     45 static int	tegra_pmc_match(device_t, cfdata_t, void *);
     46 static void	tegra_pmc_attach(device_t, device_t, void *);
     47 
     48 struct tegra_pmc_softc {
     49 	device_t		sc_dev;
     50 	bus_space_tag_t		sc_bst;
     51 	bus_space_handle_t	sc_bsh;
     52 };
     53 
     54 static struct tegra_pmc_softc *pmc_softc = NULL;
     55 
     56 CFATTACH_DECL_NEW(tegra_pmc, sizeof(struct tegra_pmc_softc),
     57 	tegra_pmc_match, tegra_pmc_attach, NULL, NULL);
     58 
     59 static int
     60 tegra_pmc_match(device_t parent, cfdata_t cf, void *aux)
     61 {
     62 	return 1;
     63 }
     64 
     65 static void
     66 tegra_pmc_attach(device_t parent, device_t self, void *aux)
     67 {
     68 	struct tegra_pmc_softc * const sc = device_private(self);
     69 	struct tegraio_attach_args * const tio = aux;
     70 	const struct tegra_locators * const loc = &tio->tio_loc;
     71 
     72 	sc->sc_dev = self;
     73 	sc->sc_bst = tio->tio_bst;
     74 	bus_space_subregion(tio->tio_bst, tio->tio_bsh,
     75 	    loc->loc_offset, loc->loc_size, &sc->sc_bsh);
     76 
     77 	KASSERT(pmc_softc == NULL);
     78 	pmc_softc = sc;
     79 
     80 	aprint_naive("\n");
     81 	aprint_normal(": PMC\n");
     82 }
     83 
     84 static void
     85 tegra_pmc_get_bs(bus_space_tag_t *pbst, bus_space_handle_t *pbsh)
     86 {
     87 	if (pmc_softc) {
     88 		*pbst = pmc_softc->sc_bst;
     89 		*pbsh = pmc_softc->sc_bsh;
     90 	} else {
     91 		*pbst = &armv7_generic_bs_tag;
     92 		bus_space_subregion(*pbst, tegra_apb_bsh,
     93 		    TEGRA_PMC_OFFSET, TEGRA_PMC_SIZE, pbsh);
     94 	}
     95 }
     96 
     97 void
     98 tegra_pmc_reset(void)
     99 {
    100 	bus_space_tag_t bst;
    101 	bus_space_handle_t bsh;
    102 	uint32_t cntrl;
    103 
    104 	tegra_pmc_get_bs(&bst, &bsh);
    105 
    106 	cntrl = bus_space_read_4(bst, bsh, PMC_CNTRL_0_REG);
    107 	cntrl |= PMC_CNTRL_0_MAIN_RST;
    108 	bus_space_write_4(bst, bsh, PMC_CNTRL_0_REG, cntrl);
    109 
    110 	for (;;) {
    111 		__asm("wfi");
    112 	}
    113 }
    114 
    115 void
    116 tegra_pmc_power(u_int partid, bool enable)
    117 {
    118 	bus_space_tag_t bst;
    119 	bus_space_handle_t bsh;
    120 	uint32_t status;
    121 	bool state;
    122 
    123 	tegra_pmc_get_bs(&bst, &bsh);
    124 
    125 	status = bus_space_read_4(bst, bsh, PMC_PWRGATE_STATUS_0_REG);
    126 	state = !!(status & __BIT(partid));
    127 	if (state == enable)
    128 		return;
    129 
    130 	bus_space_write_4(bst, bsh, PMC_PWRGATE_TOGGLE_0_REG,
    131 	    __SHIFTIN(partid, PMC_PWRGATE_TOGGLE_0_PARTID) |
    132 	    PMC_PWRGATE_TOGGLE_0_START);
    133 }
    134