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tegra_mc.c revision 1.7.10.2
      1  1.7.10.2  jdolecek /* $NetBSD: tegra_mc.c,v 1.7.10.2 2017/12/03 11:35:54 jdolecek Exp $ */
      2  1.7.10.2  jdolecek 
      3  1.7.10.2  jdolecek /*-
      4  1.7.10.2  jdolecek  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  1.7.10.2  jdolecek  * All rights reserved.
      6  1.7.10.2  jdolecek  *
      7  1.7.10.2  jdolecek  * Redistribution and use in source and binary forms, with or without
      8  1.7.10.2  jdolecek  * modification, are permitted provided that the following conditions
      9  1.7.10.2  jdolecek  * are met:
     10  1.7.10.2  jdolecek  * 1. Redistributions of source code must retain the above copyright
     11  1.7.10.2  jdolecek  *    notice, this list of conditions and the following disclaimer.
     12  1.7.10.2  jdolecek  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.7.10.2  jdolecek  *    notice, this list of conditions and the following disclaimer in the
     14  1.7.10.2  jdolecek  *    documentation and/or other materials provided with the distribution.
     15  1.7.10.2  jdolecek  *
     16  1.7.10.2  jdolecek  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  1.7.10.2  jdolecek  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  1.7.10.2  jdolecek  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  1.7.10.2  jdolecek  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  1.7.10.2  jdolecek  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  1.7.10.2  jdolecek  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  1.7.10.2  jdolecek  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  1.7.10.2  jdolecek  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  1.7.10.2  jdolecek  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  1.7.10.2  jdolecek  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  1.7.10.2  jdolecek  * SUCH DAMAGE.
     27  1.7.10.2  jdolecek  */
     28  1.7.10.2  jdolecek 
     29  1.7.10.2  jdolecek #include "locators.h"
     30  1.7.10.2  jdolecek 
     31  1.7.10.2  jdolecek #include <sys/cdefs.h>
     32  1.7.10.2  jdolecek __KERNEL_RCSID(0, "$NetBSD: tegra_mc.c,v 1.7.10.2 2017/12/03 11:35:54 jdolecek Exp $");
     33  1.7.10.2  jdolecek 
     34  1.7.10.2  jdolecek #include <sys/param.h>
     35  1.7.10.2  jdolecek #include <sys/bus.h>
     36  1.7.10.2  jdolecek #include <sys/device.h>
     37  1.7.10.2  jdolecek #include <sys/intr.h>
     38  1.7.10.2  jdolecek #include <sys/systm.h>
     39  1.7.10.2  jdolecek #include <sys/kernel.h>
     40  1.7.10.2  jdolecek 
     41  1.7.10.2  jdolecek #include <arm/nvidia/tegra_reg.h>
     42  1.7.10.2  jdolecek #include <arm/nvidia/tegra_mcreg.h>
     43  1.7.10.2  jdolecek #include <arm/nvidia/tegra_var.h>
     44  1.7.10.2  jdolecek 
     45  1.7.10.2  jdolecek #include <dev/fdt/fdtvar.h>
     46  1.7.10.2  jdolecek 
     47  1.7.10.2  jdolecek static int	tegra_mc_match(device_t, cfdata_t, void *);
     48  1.7.10.2  jdolecek static void	tegra_mc_attach(device_t, device_t, void *);
     49  1.7.10.2  jdolecek 
     50  1.7.10.2  jdolecek static int	tegra_mc_intr(void *);
     51  1.7.10.2  jdolecek 
     52  1.7.10.2  jdolecek struct tegra_mc_softc {
     53  1.7.10.2  jdolecek 	device_t		sc_dev;
     54  1.7.10.2  jdolecek 	bus_space_tag_t		sc_bst;
     55  1.7.10.2  jdolecek 	bus_space_handle_t	sc_bsh;
     56  1.7.10.2  jdolecek 	void			*sc_ih;
     57  1.7.10.2  jdolecek };
     58  1.7.10.2  jdolecek 
     59  1.7.10.2  jdolecek static struct tegra_mc_softc *mc_softc = NULL;
     60  1.7.10.2  jdolecek 
     61  1.7.10.2  jdolecek CFATTACH_DECL_NEW(tegra_mc, sizeof(struct tegra_mc_softc),
     62  1.7.10.2  jdolecek 	tegra_mc_match, tegra_mc_attach, NULL, NULL);
     63  1.7.10.2  jdolecek 
     64  1.7.10.2  jdolecek #define MC_READ(sc, reg)		\
     65  1.7.10.2  jdolecek     bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
     66  1.7.10.2  jdolecek #define MC_WRITE(sc, reg, val)		\
     67  1.7.10.2  jdolecek     bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
     68  1.7.10.2  jdolecek #define MC_SET_CLEAR(sc, reg, set, clr)	\
     69  1.7.10.2  jdolecek     tegra_reg_set_clear((sc)->sc_bst, (sc)->sc_bsh, (reg), (set), (clr))
     70  1.7.10.2  jdolecek 
     71  1.7.10.2  jdolecek static int
     72  1.7.10.2  jdolecek tegra_mc_match(device_t parent, cfdata_t cf, void *aux)
     73  1.7.10.2  jdolecek {
     74  1.7.10.2  jdolecek 	const char * const compatible[] = { "nvidia,tegra124-mc", NULL };
     75  1.7.10.2  jdolecek 	struct fdt_attach_args * const faa = aux;
     76  1.7.10.2  jdolecek 
     77  1.7.10.2  jdolecek 	return of_match_compatible(faa->faa_phandle, compatible);
     78  1.7.10.2  jdolecek }
     79  1.7.10.2  jdolecek 
     80  1.7.10.2  jdolecek static void
     81  1.7.10.2  jdolecek tegra_mc_attach(device_t parent, device_t self, void *aux)
     82  1.7.10.2  jdolecek {
     83  1.7.10.2  jdolecek 	struct tegra_mc_softc * const sc = device_private(self);
     84  1.7.10.2  jdolecek 	struct fdt_attach_args * const faa = aux;
     85  1.7.10.2  jdolecek 	char intrstr[128];
     86  1.7.10.2  jdolecek 	bus_addr_t addr;
     87  1.7.10.2  jdolecek 	bus_size_t size;
     88  1.7.10.2  jdolecek 	int error;
     89  1.7.10.2  jdolecek 
     90  1.7.10.2  jdolecek 	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
     91  1.7.10.2  jdolecek 		aprint_error(": couldn't get registers\n");
     92  1.7.10.2  jdolecek 		return;
     93  1.7.10.2  jdolecek 	}
     94  1.7.10.2  jdolecek 
     95  1.7.10.2  jdolecek 	sc->sc_dev = self;
     96  1.7.10.2  jdolecek 	sc->sc_bst = faa->faa_bst;
     97  1.7.10.2  jdolecek 	error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh);
     98  1.7.10.2  jdolecek 	if (error) {
     99  1.7.10.2  jdolecek 		aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
    100  1.7.10.2  jdolecek 		return;
    101  1.7.10.2  jdolecek 	}
    102  1.7.10.2  jdolecek 
    103  1.7.10.2  jdolecek 	KASSERT(mc_softc == NULL);
    104  1.7.10.2  jdolecek 	mc_softc = sc;
    105  1.7.10.2  jdolecek 
    106  1.7.10.2  jdolecek 	aprint_naive("\n");
    107  1.7.10.2  jdolecek 	aprint_normal(": MC\n");
    108  1.7.10.2  jdolecek 
    109  1.7.10.2  jdolecek 	if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
    110  1.7.10.2  jdolecek 		aprint_error_dev(self, "failed to decode interrupt\n");
    111  1.7.10.2  jdolecek 		return;
    112  1.7.10.2  jdolecek 	}
    113  1.7.10.2  jdolecek 
    114  1.7.10.2  jdolecek 	sc->sc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_VM,
    115  1.7.10.2  jdolecek 	    FDT_INTR_MPSAFE, tegra_mc_intr, sc);
    116  1.7.10.2  jdolecek 	if (sc->sc_ih == NULL) {
    117  1.7.10.2  jdolecek 		aprint_error_dev(self, "failed to establish interrupt on %s\n",
    118  1.7.10.2  jdolecek 		    intrstr);
    119  1.7.10.2  jdolecek 		return;
    120  1.7.10.2  jdolecek 	}
    121  1.7.10.2  jdolecek 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    122  1.7.10.2  jdolecek 
    123  1.7.10.2  jdolecek 	MC_WRITE(sc, MC_INTSTATUS_REG, MC_INT__ALL);
    124  1.7.10.2  jdolecek 	MC_WRITE(sc, MC_INTMASK_REG, MC_INT__ALL);
    125  1.7.10.2  jdolecek }
    126  1.7.10.2  jdolecek 
    127  1.7.10.2  jdolecek static int
    128  1.7.10.2  jdolecek tegra_mc_intr(void *v)
    129  1.7.10.2  jdolecek {
    130  1.7.10.2  jdolecek 	struct tegra_mc_softc * const sc = v;
    131  1.7.10.2  jdolecek 
    132  1.7.10.2  jdolecek 	const uint32_t status = MC_READ(sc, MC_INTSTATUS_REG);
    133  1.7.10.2  jdolecek 
    134  1.7.10.2  jdolecek 	if (status == 0) {
    135  1.7.10.2  jdolecek 		return 0;
    136  1.7.10.2  jdolecek 	}
    137  1.7.10.2  jdolecek 
    138  1.7.10.2  jdolecek 	const uint32_t err_status = MC_READ(sc, MC_ERR_STATUS_REG);
    139  1.7.10.2  jdolecek 	const uint32_t err_adr = MC_READ(sc, MC_ERR_ADR_REG);
    140  1.7.10.2  jdolecek 
    141  1.7.10.2  jdolecek 	device_printf(sc->sc_dev, "intrstatus %#x err %#x adr %#x\n",
    142  1.7.10.2  jdolecek 	    status, err_status, err_adr);
    143  1.7.10.2  jdolecek 
    144  1.7.10.2  jdolecek 	MC_WRITE(sc, MC_INTSTATUS_REG, status);
    145  1.7.10.2  jdolecek 
    146  1.7.10.2  jdolecek 	return status;
    147  1.7.10.2  jdolecek }
    148