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      1 /* $NetBSD: gic_acpi.c,v 1.8 2023/11/25 20:17:52 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jared McNeill <jmcneill (at) invisible.ca>.
      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 "pci.h"
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: gic_acpi.c,v 1.8 2023/11/25 20:17:52 jmcneill Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/bus.h>
     39 #include <sys/cpu.h>
     40 #include <sys/device.h>
     41 #include <sys/kmem.h>
     42 
     43 #include <dev/acpi/acpireg.h>
     44 #include <dev/acpi/acpivar.h>
     45 
     46 #include <dev/fdt/fdtvar.h>
     47 
     48 #include <arm/cortex/gic_intr.h>
     49 #include <arm/cortex/gic_reg.h>
     50 #include <arm/cortex/gic_v2m.h>
     51 #include <arm/cortex/mpcore_var.h>
     52 
     53 #include <arm/acpi/gic_v2m_acpi.h>
     54 
     55 #define	GICD_SIZE		0x1000
     56 #define	GICC_SIZE		0x1000
     57 
     58 extern struct bus_space arm_generic_bs_tag;
     59 extern struct pic_softc *pic_list[];
     60 
     61 static int	gic_acpi_match(device_t, cfdata_t, void *);
     62 static void	gic_acpi_attach(device_t, device_t, void *);
     63 
     64 static ACPI_STATUS gic_acpi_find_gicc(ACPI_SUBTABLE_HEADER *, void *);
     65 
     66 CFATTACH_DECL_NEW(gic_acpi, 0, gic_acpi_match, gic_acpi_attach, NULL, NULL);
     67 
     68 static int
     69 gic_acpi_match(device_t parent, cfdata_t cf, void *aux)
     70 {
     71 	ACPI_SUBTABLE_HEADER *hdrp = aux;
     72 	ACPI_MADT_GENERIC_DISTRIBUTOR *gicd;
     73 
     74 	if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR)
     75 		return 0;
     76 
     77 	gicd = (ACPI_MADT_GENERIC_DISTRIBUTOR *)hdrp;
     78 
     79 	switch (gicd->Version) {
     80 	case ACPI_MADT_GIC_VERSION_NONE:
     81 		return __SHIFTOUT(reg_id_aa64pfr0_el1_read(), ID_AA64PFR0_EL1_GIC) == 0;
     82 	case ACPI_MADT_GIC_VERSION_V1:
     83 	case ACPI_MADT_GIC_VERSION_V2:
     84 		return 1;
     85 	default:
     86 		return 0;
     87 	}
     88 }
     89 
     90 static void
     91 gic_acpi_attach(device_t parent, device_t self, void *aux)
     92 {
     93 	ACPI_MADT_GENERIC_DISTRIBUTOR *gicd = aux;
     94 	ACPI_MADT_GENERIC_INTERRUPT *gicc = NULL;
     95 	bus_space_handle_t bsh;
     96 	device_t armgic;
     97 	int error;
     98 
     99 	acpi_madt_walk(gic_acpi_find_gicc, &gicc);
    100 	if (gicc == NULL) {
    101 		aprint_error(": couldn't find GICC registers\n");
    102 		return;
    103 	}
    104 
    105 	const bus_addr_t addr = ulmin(gicd->BaseAddress, gicc->BaseAddress);
    106 	const bus_size_t end = ulmax(gicd->BaseAddress + GICD_SIZE, gicc->BaseAddress + GICC_SIZE);
    107 	const bus_size_t size = end - addr;
    108 
    109 	error = bus_space_map(&arm_generic_bs_tag, addr, size, 0, &bsh);
    110 	if (error) {
    111 		aprint_error(": couldn't map registers: %d\n", error);
    112 		return;
    113 	}
    114 
    115 	aprint_naive("\n");
    116 	aprint_normal(": GIC\n");
    117 
    118 	struct mpcore_attach_args mpcaa = {
    119 		.mpcaa_name = "armgic",
    120 		.mpcaa_memt = &arm_generic_bs_tag,
    121 		.mpcaa_memh = bsh,
    122 		.mpcaa_off1 = gicd->BaseAddress - addr,
    123 		.mpcaa_off2 = gicc->BaseAddress - addr,
    124 	};
    125 
    126 	armgic = config_found(self, &mpcaa, NULL, CFARGS_NONE);
    127 	if (armgic != NULL) {
    128 		arm_fdt_irq_set_handler(armgic_irq_handler);
    129 
    130 #if NPCI > 0
    131 		acpi_madt_walk(gic_v2m_acpi_find_msi_frame, armgic);
    132 #endif
    133 	}
    134 }
    135 
    136 static ACPI_STATUS
    137 gic_acpi_find_gicc(ACPI_SUBTABLE_HEADER *hdrp, void *aux)
    138 {
    139 	ACPI_MADT_GENERIC_INTERRUPT **giccp = aux;
    140 
    141 	if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT)
    142 		return AE_OK;
    143 
    144 	*giccp = (ACPI_MADT_GENERIC_INTERRUPT *)hdrp;
    145 
    146 	return AE_LIMIT;
    147 }
    148