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a9ptmr_fdt.c revision 1.1 
      1 /* $NetBSD: a9ptmr_fdt.c,v 1.1 2019/08/10 17:03:59 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: a9ptmr_fdt.c,v 1.1 2019/08/10 17:03:59 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 
     38 #include <sys/device.h>
     39 #include <sys/intr.h>
     40 
     41 #include <arm/cortex/mpcore_var.h>
     42 #include <arm/cortex/a9ptmr_var.h>
     43 
     44 #include <dev/fdt/fdtvar.h>
     45 #include <arm/fdt/arm_fdtvar.h>
     46 
     47 static int	a9ptmr_fdt_match(device_t, cfdata_t, void *);
     48 static void	a9ptmr_fdt_attach(device_t, device_t, void *);
     49 
     50 static void	a9ptmr_fdt_cpu_hatch(void *, struct cpu_info *);
     51 
     52 struct a9ptmr_fdt_softc {
     53 	device_t	sc_dev;
     54 	struct clk	*sc_clk;
     55 };
     56 
     57 CFATTACH_DECL_NEW(a9ptmr_fdt, sizeof(struct a9ptmr_fdt_softc),
     58     a9ptmr_fdt_match, a9ptmr_fdt_attach, NULL, NULL);
     59 
     60 static int
     61 a9ptmr_fdt_match(device_t parent, cfdata_t cf, void *aux)
     62 {
     63 	const char * const compatible[] = {
     64 		"arm,cortex-a9-twd-timer",
     65 		"arm,cortex-a5-twd-timer",
     66 		NULL
     67 	};
     68 	struct fdt_attach_args * const faa = aux;
     69 
     70 	return of_compatible(faa->faa_phandle, compatible) >= 0;
     71 }
     72 
     73 static void
     74 a9ptmr_fdt_attach(device_t parent, device_t self, void *aux)
     75 {
     76 	struct a9ptmr_fdt_softc * const sc = device_private(self);
     77 	struct fdt_attach_args * const faa = aux;
     78 	const int phandle = faa->faa_phandle;
     79 	bus_space_handle_t bsh;
     80 
     81 	sc->sc_dev = self;
     82 	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
     83 	if (sc->sc_clk == NULL) {
     84 		aprint_error(": couldn't get clock\n");
     85 		return;
     86 	}
     87 	if (clk_enable(sc->sc_clk) != 0) {
     88 		aprint_error(": couldn't enable clock\n");
     89 		return;
     90 	}
     91 
     92 	uint32_t rate = clk_get_rate(sc->sc_clk);
     93 	prop_dictionary_t dict = device_properties(self);
     94 	prop_dictionary_set_uint32(dict, "frequency", rate);
     95 
     96 	char intrstr[128];
     97 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
     98 		aprint_error(": failed to decode interrupt\n");
     99 		return;
    100 	}
    101 
    102 	aprint_naive("\n");
    103 	aprint_normal("\n");
    104 
    105 	void *ih = fdtbus_intr_establish(phandle, 0, IPL_CLOCK,
    106 	    FDT_INTR_MPSAFE, a9ptmr_intr, NULL);
    107 	if (ih == NULL) {
    108 		aprint_error_dev(self, "couldn't install interrupt handler\n");
    109 		return;
    110 	}
    111 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    112 
    113 	bus_addr_t addr;
    114 	bus_size_t size;
    115 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
    116 		aprint_error(": couldn't get registers\n");
    117 		return;
    118 	}
    119 	if (bus_space_map(faa->faa_bst, addr, size, 0, &bsh)) {
    120 		aprint_error(": couldn't map registers\n");
    121 		return;
    122 	}
    123 
    124 	struct mpcore_attach_args mpcaa = {
    125 		.mpcaa_name = "arma9ptmr",
    126 		.mpcaa_memt = faa->faa_bst,
    127 		.mpcaa_memh = bsh,
    128 		.mpcaa_irq = -1,
    129 	};
    130 
    131 	config_found(self, &mpcaa, NULL);
    132 
    133 	arm_fdt_cpu_hatch_register(self, a9ptmr_fdt_cpu_hatch);
    134 	arm_fdt_timer_register(a9ptmr_cpu_initclocks);
    135 }
    136 
    137 static void
    138 a9ptmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci)
    139 {
    140 	a9ptmr_init_cpu_clock(ci);
    141 }
    142