1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory (Department of Computer Science and
8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9 * DARPA SSITH research programme.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include "opt_platform.h"
37#include <sys/param.h>
38#include <sys/conf.h>
39#include <sys/bus.h>
40#include <sys/kernel.h>
41#include <sys/lock.h>
42#include <sys/malloc.h>
43#include <sys/mbuf.h>
44#include <sys/mutex.h>
45#include <sys/rwlock.h>
46
47#include <machine/bus.h>
48
49#include <vm/vm.h>
50#include <vm/pmap.h>
51#include <vm/vm_extern.h>
52#include <vm/vm_page.h>
53
54#ifdef FDT
55#include <dev/fdt/fdt_common.h>
56#include <dev/ofw/ofw_bus.h>
57#include <dev/ofw/ofw_bus_subr.h>
58#endif
59
60#include <dev/xdma/xdma.h>
61#include "xdma_if.h"
62
63void
64xdma_iommu_remove_entry(xdma_channel_t *xchan, vm_offset_t va)
65{
66	struct xdma_iommu *xio;
67
68	xio = &xchan->xio;
69
70	va &= ~(PAGE_SIZE - 1);
71	pmap_remove(&xio->p, va, va + PAGE_SIZE);
72
73	XDMA_IOMMU_REMOVE(xio->dev, xio, va);
74
75	vmem_free(xio->vmem, va, PAGE_SIZE);
76}
77
78static void
79xdma_iommu_enter(struct xdma_iommu *xio, vm_offset_t va,
80    vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
81{
82	vm_page_t m;
83	pmap_t p;
84
85	p = &xio->p;
86
87	KASSERT((size & PAGE_MASK) == 0,
88	    ("%s: device mapping not page-sized", __func__));
89
90	for (; size > 0; size -= PAGE_SIZE) {
91		m = PHYS_TO_VM_PAGE(pa);
92		pmap_enter(p, va, m, prot, prot | PMAP_ENTER_WIRED, 0);
93
94		XDMA_IOMMU_ENTER(xio->dev, xio, va, pa);
95
96		va += PAGE_SIZE;
97		pa += PAGE_SIZE;
98	}
99}
100
101void
102xdma_iommu_add_entry(xdma_channel_t *xchan, vm_offset_t *va,
103    vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
104{
105	struct xdma_iommu *xio;
106	vm_offset_t addr;
107
108	size = roundup2(size, PAGE_SIZE);
109	xio = &xchan->xio;
110
111	if (vmem_alloc(xio->vmem, size,
112	    M_FIRSTFIT | M_NOWAIT, &addr)) {
113		panic("Could not allocate virtual address.\n");
114	}
115
116	addr |= pa & (PAGE_SIZE - 1);
117
118	if (va)
119		*va = addr;
120
121	xdma_iommu_enter(xio, addr, pa, size, prot);
122}
123
124int
125xdma_iommu_init(struct xdma_iommu *xio)
126{
127#ifdef FDT
128	phandle_t mem_node, node;
129	pcell_t mem_handle;
130#endif
131
132	pmap_pinit(&xio->p);
133
134#ifdef FDT
135	node = ofw_bus_get_node(xio->dev);
136	if (!OF_hasprop(node, "va-region"))
137		return (ENXIO);
138
139	if (OF_getencprop(node, "va-region", (void *)&mem_handle,
140	    sizeof(mem_handle)) <= 0)
141		return (ENXIO);
142#endif
143
144	xio->vmem = vmem_create("xDMA vmem", 0, 0, PAGE_SIZE,
145	    PAGE_SIZE, M_FIRSTFIT | M_WAITOK);
146	if (xio->vmem == NULL)
147		return (ENXIO);
148
149#ifdef FDT
150	mem_node = OF_node_from_xref(mem_handle);
151	if (xdma_handle_mem_node(xio->vmem, mem_node) != 0) {
152		vmem_destroy(xio->vmem);
153		return (ENXIO);
154	}
155#endif
156
157	XDMA_IOMMU_INIT(xio->dev, xio);
158
159	return (0);
160}
161
162int
163xdma_iommu_release(struct xdma_iommu *xio)
164{
165
166	pmap_release(&xio->p);
167
168	vmem_destroy(xio->vmem);
169
170	XDMA_IOMMU_RELEASE(xio->dev, xio);
171
172	return (0);
173}
174