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      1 /* $NetBSD: gic_v2m_acpi.c,v 1.1 2019/10/14 11:00:13 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 <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: gic_v2m_acpi.c,v 1.1 2019/10/14 11:00:13 jmcneill Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/cpu.h>
     38 #include <sys/device.h>
     39 #include <sys/kmem.h>
     40 
     41 #include <dev/acpi/acpireg.h>
     42 #include <dev/acpi/acpivar.h>
     43 
     44 #include <arm/cortex/gic_v2m.h>
     45 
     46 #include <arm/acpi/gic_v2m_acpi.h>
     47 
     48 #define	GICMSIFRAME_SIZE	0x1000
     49 
     50 extern struct bus_space arm_generic_bs_tag;
     51 extern struct pic_softc *pic_list[];
     52 
     53 static const struct gic_v2m_acpi_quirk {
     54 	const char			q_oemid[ACPI_OEM_ID_SIZE+1];
     55 	const char			q_oemtableid[ACPI_OEM_TABLE_ID_SIZE+1];
     56 	uint32_t			q_flags;
     57 } gic_v2m_acpi_quirks[] = {
     58 	{ "AMAZON",     "GRAVITON",     GIC_V2M_FLAG_GRAVITON },
     59 };
     60 
     61 static uint32_t
     62 gic_v2m_acpi_flags(void)
     63 {
     64 	ACPI_TABLE_MADT *madt;
     65 	ACPI_STATUS rv;
     66 	int n;
     67 
     68 	rv = AcpiGetTable(ACPI_SIG_MADT, 0, (ACPI_TABLE_HEADER **)&madt);
     69 	if (ACPI_FAILURE(rv))
     70 		return 0;
     71 
     72 	for (n = 0; n < __arraycount(gic_v2m_acpi_quirks); n++) {
     73 		const struct gic_v2m_acpi_quirk *q = &gic_v2m_acpi_quirks[n];
     74 		if (memcmp(q->q_oemid, madt->Header.OemId, ACPI_OEM_ID_SIZE) == 0 &&
     75 		    memcmp(q->q_oemtableid, madt->Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE) == 0)
     76 			return q->q_flags;
     77 	}
     78 
     79 	return 0;
     80 }
     81 
     82 ACPI_STATUS
     83 gic_v2m_acpi_find_msi_frame(ACPI_SUBTABLE_HEADER *hdrp, void *aux)
     84 {
     85 	ACPI_MADT_GENERIC_MSI_FRAME *msi_frame = (ACPI_MADT_GENERIC_MSI_FRAME *)hdrp;
     86 	struct gic_v2m_frame *frame;
     87 	struct pic_softc *pic = pic_list[0];
     88 	device_t dev = aux;
     89 
     90 	if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_MSI_FRAME)
     91 		return AE_OK;
     92 
     93 	frame = kmem_zalloc(sizeof(*frame), KM_SLEEP);
     94 	frame->frame_reg = msi_frame->BaseAddress;
     95 	frame->frame_pic = pic;
     96 	frame->frame_flags = gic_v2m_acpi_flags();
     97 	if (msi_frame->Flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
     98 		frame->frame_base = msi_frame->SpiBase;
     99 		frame->frame_count = msi_frame->SpiCount;
    100 	} else {
    101 		bus_space_tag_t bst = &arm_generic_bs_tag;
    102 		bus_space_handle_t bsh;
    103 		if (bus_space_map(bst, frame->frame_reg, GICMSIFRAME_SIZE, 0, &bsh) != 0) {
    104 			printf("%s: failed to map frame\n", __func__);
    105 			return AE_OK;
    106 		}
    107 		const uint32_t typer = bus_space_read_4(bst, bsh, GIC_MSI_TYPER);
    108 		bus_space_unmap(bst, bsh, GICMSIFRAME_SIZE);
    109 
    110 		frame->frame_base = __SHIFTOUT(typer, GIC_MSI_TYPER_BASE);
    111 		frame->frame_count = __SHIFTOUT(typer, GIC_MSI_TYPER_NUMBER);
    112 	}
    113 
    114 	if (gic_v2m_init(frame, dev, msi_frame->MsiFrameId) != 0)
    115 		aprint_error_dev(dev, "failed to initialize GICv2m\n");
    116 	else
    117 		aprint_normal_dev(dev, "GICv2m @ %#" PRIx64 ", SPIs %u-%u\n",
    118 		    (uint64_t)frame->frame_reg, frame->frame_base,
    119 		    frame->frame_base + frame->frame_count);
    120 
    121 	return AE_OK;
    122 }
    123