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@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