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      1 /* $NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared 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 <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/systm.h>
     36 #include <sys/kernel.h>
     37 
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 #include <dev/ic/pl181reg.h>
     41 #include <dev/ic/pl181var.h>
     42 
     43 static int	plmmc_fdt_match(device_t, cfdata_t, void *);
     44 static void	plmmc_fdt_attach(device_t, device_t, void *);
     45 
     46 static const struct device_compatible_entry compat_data[] = {
     47 	{ .compat = "arm,pl180" },
     48 	{ .compat = "arm,pl181" },
     49 	DEVICE_COMPAT_EOL
     50 };
     51 
     52 CFATTACH_DECL_NEW(plmmc_fdt, sizeof(struct plmmc_softc),
     53 	plmmc_fdt_match, plmmc_fdt_attach, NULL, NULL);
     54 
     55 static int
     56 plmmc_fdt_match(device_t parent, cfdata_t cf, void *aux)
     57 {
     58 	struct fdt_attach_args * const faa = aux;
     59 
     60 	return of_compatible_match(faa->faa_phandle, compat_data);
     61 }
     62 
     63 static void
     64 plmmc_fdt_attach(device_t parent, device_t self, void *aux)
     65 {
     66 	struct plmmc_softc * const sc = device_private(self);
     67 	struct fdt_attach_args * const faa = aux;
     68 	const int phandle = faa->faa_phandle;
     69 	struct clk *clk;
     70 	bus_addr_t addr;
     71 	bus_size_t size;
     72 	void *ih;
     73 
     74 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     75 		aprint_error(": missing 'reg' property\n");
     76 		return;
     77 	}
     78 
     79 	clk = fdtbus_clock_get_index(phandle, 0);
     80 	if (clk == NULL) {
     81 		aprint_error(": couldn't get clock\n");
     82 		return;
     83 	}
     84 
     85 	if (clk_enable(clk) != 0) {
     86 		aprint_error(": couldn't enable clock\n");
     87 		return;
     88 	}
     89 
     90 	char intrstr[128];
     91 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
     92 		aprint_error(": failed to decode interrupt\n");
     93 		return;
     94 	}
     95 
     96 	sc->sc_dev = self;
     97 	sc->sc_clock_freq = clk_get_rate(clk);
     98 	of_getprop_uint32(phandle, "max-frequency", &sc->sc_max_freq);
     99 	sc->sc_bst = faa->faa_bst;
    100 	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) {
    101 		aprint_error(": couldn't map device\n");
    102 		return;
    103 	}
    104 
    105 	aprint_naive("\n");
    106 	aprint_normal("\n");
    107 
    108 	ih = fdtbus_intr_establish_xname(phandle, 0, IPL_BIO, 0, plmmc_intr, sc,
    109 	    device_xname(self));
    110 	if (ih == NULL) {
    111 		aprint_error_dev(self, "couldn't install interrupt handler\n");
    112 		return;
    113 	}
    114 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    115 
    116 	plmmc_init(sc);
    117 }
    118