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acpi_pci_graviton.c revision 1.2 
      1 /* $NetBSD: acpi_pci_graviton.c,v 1.2 2020/06/15 18:57:39 ad Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018, 2020 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: acpi_pci_graviton.c,v 1.2 2020/06/15 18:57:39 ad Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/intr.h>
     39 #include <sys/systm.h>
     40 #include <sys/kernel.h>
     41 #include <sys/extent.h>
     42 #include <sys/kmem.h>
     43 #include <sys/cpu.h>
     44 
     45 #include <dev/pci/pcireg.h>
     46 #include <dev/pci/pcivar.h>
     47 #include <dev/pci/pciconf.h>
     48 
     49 #include <dev/acpi/acpivar.h>
     50 #include <dev/acpi/acpi_pci.h>
     51 #include <dev/acpi/acpi_mcfg.h>
     52 
     53 #include <arm/acpi/acpi_pci_machdep.h>
     54 
     55 static int
     56 acpi_pci_graviton_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data)
     57 {
     58 	struct acpi_pci_context *ap = pc->pc_conf_v;
     59 	int b, d, f;
     60 
     61 	pci_decompose_tag(pc, tag, &b, &d, &f);
     62 
     63 	if (ap->ap_bus == b) {
     64 		if (d > 0 || f > 0) {
     65 			*data = -1;
     66 			return EINVAL;
     67 		}
     68 		*data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg);
     69 		return 0;
     70 	}
     71 
     72 	return acpimcfg_conf_read(pc, tag, reg, data);
     73 }
     74 
     75 static int
     76 acpi_pci_graviton_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
     77 {
     78 	struct acpi_pci_context *ap = pc->pc_conf_v;
     79 	int b, d, f;
     80 
     81 	pci_decompose_tag(pc, tag, &b, &d, &f);
     82 
     83 	if (ap->ap_bus == b) {
     84 		if (d > 0 || f > 0) {
     85 			return EINVAL;
     86 		}
     87 		bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data);
     88 		return 0;
     89 	}
     90 
     91 	return acpimcfg_conf_write(pc, tag, reg, data);
     92 }
     93 
     94 static ACPI_STATUS
     95 acpi_pci_graviton_map(ACPI_HANDLE handle, UINT32 level, void *ctx, void **retval)
     96 {
     97 	struct acpi_pci_context *ap = ctx;
     98 	struct acpi_resources res;
     99 	struct acpi_mem *mem;
    100 	ACPI_HANDLE parent;
    101 	ACPI_INTEGER seg;
    102 	ACPI_STATUS rv;
    103 	int error;
    104 
    105 	rv = AcpiGetParent(handle, &parent);
    106 	if (ACPI_FAILURE(rv))
    107 		return rv;
    108 	rv = acpi_eval_integer(parent, "_SEG", &seg);
    109 	if (ACPI_FAILURE(rv))
    110 		seg = 0;
    111 	if (ap->ap_seg != seg)
    112 		return AE_OK;
    113 
    114 	rv = acpi_resource_parse(ap->ap_dev, handle, "_CRS", &res, &acpi_resource_parse_ops_quiet);
    115 	if (ACPI_FAILURE(rv))
    116 		return rv;
    117 
    118 	mem = acpi_res_mem(&res, 0);
    119 	if (mem == NULL) {
    120 		acpi_resource_cleanup(&res);
    121 		return AE_NOT_FOUND;
    122 	}
    123 
    124 	error = bus_space_map(ap->ap_bst, mem->ar_base, mem->ar_length,
    125 	    _ARM_BUS_SPACE_MAP_STRONGLY_ORDERED, &ap->ap_conf_bsh);
    126 	if (error != 0)
    127 		return AE_NO_MEMORY;
    128 
    129 	ap->ap_conf_read = acpi_pci_graviton_conf_read;
    130 	ap->ap_conf_write = acpi_pci_graviton_conf_write;
    131 
    132 	return AE_CTRL_TERMINATE;
    133 }
    134 
    135 void
    136 acpi_pci_graviton_init(struct acpi_pci_context *ap)
    137 {
    138 	ACPI_STATUS rv;
    139 
    140 	rv = AcpiGetDevices(__UNCONST("AMZN0001"), acpi_pci_graviton_map, ap, NULL);
    141 	if (ACPI_FAILURE(rv))
    142 		return;
    143 }
    144