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acpi_pci_graviton.c revision 1.4 
      1 /* $NetBSD: acpi_pci_graviton.c,v 1.4 2020/10/24 07:08:22 skrll 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 1.4 2020/10/24 07:08:22 skrll 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/kmem.h>
     42 #include <sys/cpu.h>
     43 
     44 #include <dev/pci/pcireg.h>
     45 #include <dev/pci/pcivar.h>
     46 #include <dev/pci/pciconf.h>
     47 
     48 #include <dev/acpi/acpivar.h>
     49 #include <dev/acpi/acpi_pci.h>
     50 #include <dev/acpi/acpi_mcfg.h>
     51 
     52 #include <arm/acpi/acpi_pci_machdep.h>
     53 
     54 static int
     55 acpi_pci_graviton_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data)
     56 {
     57 	struct acpi_pci_context *ap = pc->pc_conf_v;
     58 	int b, d, f;
     59 
     60 	pci_decompose_tag(pc, tag, &b, &d, &f);
     61 
     62 	if (ap->ap_bus == b) {
     63 		if (d > 0 || f > 0) {
     64 			*data = -1;
     65 			return EINVAL;
     66 		}
     67 		*data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg);
     68 		return 0;
     69 	}
     70 
     71 	return acpimcfg_conf_read(pc, tag, reg, data);
     72 }
     73 
     74 static int
     75 acpi_pci_graviton_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
     76 {
     77 	struct acpi_pci_context *ap = pc->pc_conf_v;
     78 	int b, d, f;
     79 
     80 	pci_decompose_tag(pc, tag, &b, &d, &f);
     81 
     82 	if (ap->ap_bus == b) {
     83 		if (d > 0 || f > 0) {
     84 			return EINVAL;
     85 		}
     86 		bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data);
     87 		return 0;
     88 	}
     89 
     90 	return acpimcfg_conf_write(pc, tag, reg, data);
     91 }
     92 
     93 static ACPI_STATUS
     94 acpi_pci_graviton_map(ACPI_HANDLE handle, UINT32 level, void *ctx, void **retval)
     95 {
     96 	struct acpi_pci_context *ap = ctx;
     97 	struct acpi_resources res;
     98 	struct acpi_mem *mem;
     99 	ACPI_HANDLE parent;
    100 	ACPI_INTEGER seg;
    101 	ACPI_STATUS rv;
    102 	int error;
    103 
    104 	rv = AcpiGetParent(handle, &parent);
    105 	if (ACPI_FAILURE(rv))
    106 		return rv;
    107 	rv = acpi_eval_integer(parent, "_SEG", &seg);
    108 	if (ACPI_FAILURE(rv))
    109 		seg = 0;
    110 	if (ap->ap_seg != seg)
    111 		return AE_OK;
    112 
    113 	rv = acpi_resource_parse(ap->ap_dev, handle, "_CRS", &res, &acpi_resource_parse_ops_quiet);
    114 	if (ACPI_FAILURE(rv))
    115 		return rv;
    116 
    117 	mem = acpi_res_mem(&res, 0);
    118 	if (mem == NULL) {
    119 		acpi_resource_cleanup(&res);
    120 		return AE_NOT_FOUND;
    121 	}
    122 
    123 	error = bus_space_map(ap->ap_bst, mem->ar_base, mem->ar_length,
    124 	    _ARM_BUS_SPACE_MAP_STRONGLY_ORDERED, &ap->ap_conf_bsh);
    125 	if (error != 0)
    126 		return AE_NO_MEMORY;
    127 
    128 	ap->ap_conf_read = acpi_pci_graviton_conf_read;
    129 	ap->ap_conf_write = acpi_pci_graviton_conf_write;
    130 
    131 	return AE_CTRL_TERMINATE;
    132 }
    133 
    134 void
    135 acpi_pci_graviton_init(struct acpi_pci_context *ap)
    136 {
    137 	ACPI_STATUS rv;
    138 
    139 	rv = AcpiGetDevices(__UNCONST("AMZN0001"), acpi_pci_graviton_map, ap, NULL);
    140 	if (ACPI_FAILURE(rv))
    141 		return;
    142 }
    143