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acpi_pci_graviton.c revision 1.1.6.2 
      1 /* $NetBSD: acpi_pci_graviton.c,v 1.1.6.2 2020/04/08 14:07:27 martin 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: acpi_pci_graviton.c,v 1.1.6.2 2020/04/08 14:07:27 martin 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 
     44 #include <machine/cpu.h>
     45 
     46 #include <dev/pci/pcireg.h>
     47 #include <dev/pci/pcivar.h>
     48 #include <dev/pci/pciconf.h>
     49 
     50 #include <dev/acpi/acpivar.h>
     51 #include <dev/acpi/acpi_pci.h>
     52 #include <dev/acpi/acpi_mcfg.h>
     53 
     54 #include <arm/acpi/acpi_pci_machdep.h>
     55 
     56 static int
     57 acpi_pci_graviton_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data)
     58 {
     59 	struct acpi_pci_context *ap = pc->pc_conf_v;
     60 	int b, d, f;
     61 
     62 	pci_decompose_tag(pc, tag, &b, &d, &f);
     63 
     64 	if (ap->ap_bus == b) {
     65 		if (d > 0 || f > 0) {
     66 			*data = -1;
     67 			return EINVAL;
     68 		}
     69 		*data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg);
     70 		return 0;
     71 	}
     72 
     73 	return acpimcfg_conf_read(pc, tag, reg, data);
     74 }
     75 
     76 static int
     77 acpi_pci_graviton_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
     78 {
     79 	struct acpi_pci_context *ap = pc->pc_conf_v;
     80 	int b, d, f;
     81 
     82 	pci_decompose_tag(pc, tag, &b, &d, &f);
     83 
     84 	if (ap->ap_bus == b) {
     85 		if (d > 0 || f > 0) {
     86 			return EINVAL;
     87 		}
     88 		bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data);
     89 		return 0;
     90 	}
     91 
     92 	return acpimcfg_conf_write(pc, tag, reg, data);
     93 }
     94 
     95 static ACPI_STATUS
     96 acpi_pci_graviton_map(ACPI_HANDLE handle, UINT32 level, void *ctx, void **retval)
     97 {
     98 	struct acpi_pci_context *ap = ctx;
     99 	struct acpi_resources res;
    100 	struct acpi_mem *mem;
    101 	ACPI_HANDLE parent;
    102 	ACPI_INTEGER seg;
    103 	ACPI_STATUS rv;
    104 	int error;
    105 
    106 	rv = AcpiGetParent(handle, &parent);
    107 	if (ACPI_FAILURE(rv))
    108 		return rv;
    109 	rv = acpi_eval_integer(parent, "_SEG", &seg);
    110 	if (ACPI_FAILURE(rv))
    111 		seg = 0;
    112 	if (ap->ap_seg != seg)
    113 		return AE_OK;
    114 
    115 	rv = acpi_resource_parse(ap->ap_dev, handle, "_CRS", &res, &acpi_resource_parse_ops_quiet);
    116 	if (ACPI_FAILURE(rv))
    117 		return rv;
    118 
    119 	mem = acpi_res_mem(&res, 0);
    120 	if (mem == NULL) {
    121 		acpi_resource_cleanup(&res);
    122 		return AE_NOT_FOUND;
    123 	}
    124 
    125 	error = bus_space_map(ap->ap_bst, mem->ar_base, mem->ar_length,
    126 	    _ARM_BUS_SPACE_MAP_STRONGLY_ORDERED, &ap->ap_conf_bsh);
    127 	if (error != 0)
    128 		return AE_NO_MEMORY;
    129 
    130 	ap->ap_conf_read = acpi_pci_graviton_conf_read;
    131 	ap->ap_conf_write = acpi_pci_graviton_conf_write;
    132 
    133 	return AE_CTRL_TERMINATE;
    134 }
    135 
    136 void
    137 acpi_pci_graviton_init(struct acpi_pci_context *ap)
    138 {
    139 	ACPI_STATUS rv;
    140 
    141 	rv = AcpiGetDevices(__UNCONST("AMZN0001"), acpi_pci_graviton_map, ap, NULL);
    142 	if (ACPI_FAILURE(rv))
    143 		return;
    144 }
    145