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      1 /*	$NetBSD: nouveau_nvkm_subdev_bar_base.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Ben Skeggs
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bar_base.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 void
     32 nvkm_bar_flush(struct nvkm_bar *bar)
     33 {
     34 	if (bar && bar->func->flush)
     35 		bar->func->flush(bar);
     36 }
     37 
     38 struct nvkm_vmm *
     39 nvkm_bar_bar1_vmm(struct nvkm_device *device)
     40 {
     41 	return device->bar->func->bar1.vmm(device->bar);
     42 }
     43 
     44 void
     45 nvkm_bar_bar1_reset(struct nvkm_device *device)
     46 {
     47 	struct nvkm_bar *bar = device->bar;
     48 	if (bar) {
     49 		bar->func->bar1.init(bar);
     50 		bar->func->bar1.wait(bar);
     51 	}
     52 }
     53 
     54 struct nvkm_vmm *
     55 nvkm_bar_bar2_vmm(struct nvkm_device *device)
     56 {
     57 	/* Denies access to BAR2 when it's not initialised, used by INSTMEM
     58 	 * to know when object access needs to go through the BAR0 window.
     59 	 */
     60 	struct nvkm_bar *bar = device->bar;
     61 	if (bar && bar->bar2)
     62 		return bar->func->bar2.vmm(bar);
     63 	return NULL;
     64 }
     65 
     66 void
     67 nvkm_bar_bar2_reset(struct nvkm_device *device)
     68 {
     69 	struct nvkm_bar *bar = device->bar;
     70 	if (bar && bar->bar2) {
     71 		bar->func->bar2.init(bar);
     72 		bar->func->bar2.wait(bar);
     73 	}
     74 }
     75 
     76 void
     77 nvkm_bar_bar2_fini(struct nvkm_device *device)
     78 {
     79 	struct nvkm_bar *bar = device->bar;
     80 	if (bar && bar->bar2) {
     81 		bar->func->bar2.fini(bar);
     82 		bar->bar2 = false;
     83 	}
     84 }
     85 
     86 void
     87 nvkm_bar_bar2_init(struct nvkm_device *device)
     88 {
     89 	struct nvkm_bar *bar = device->bar;
     90 	if (bar && bar->subdev.oneinit && !bar->bar2 && bar->func->bar2.init) {
     91 		bar->func->bar2.init(bar);
     92 		bar->func->bar2.wait(bar);
     93 		bar->bar2 = true;
     94 	}
     95 }
     96 
     97 static int
     98 nvkm_bar_fini(struct nvkm_subdev *subdev, bool suspend)
     99 {
    100 	struct nvkm_bar *bar = nvkm_bar(subdev);
    101 	if (bar->func->bar1.fini)
    102 		bar->func->bar1.fini(bar);
    103 	return 0;
    104 }
    105 
    106 static int
    107 nvkm_bar_init(struct nvkm_subdev *subdev)
    108 {
    109 	struct nvkm_bar *bar = nvkm_bar(subdev);
    110 	bar->func->bar1.init(bar);
    111 	bar->func->bar1.wait(bar);
    112 	if (bar->func->init)
    113 		bar->func->init(bar);
    114 	return 0;
    115 }
    116 
    117 static int
    118 nvkm_bar_oneinit(struct nvkm_subdev *subdev)
    119 {
    120 	struct nvkm_bar *bar = nvkm_bar(subdev);
    121 	return bar->func->oneinit(bar);
    122 }
    123 
    124 static void *
    125 nvkm_bar_dtor(struct nvkm_subdev *subdev)
    126 {
    127 	struct nvkm_bar *bar = nvkm_bar(subdev);
    128 	nvkm_bar_bar2_fini(subdev->device);
    129 	spin_lock_destroy(&bar->lock);
    130 	return bar->func->dtor(bar);
    131 }
    132 
    133 static const struct nvkm_subdev_func
    134 nvkm_bar = {
    135 	.dtor = nvkm_bar_dtor,
    136 	.oneinit = nvkm_bar_oneinit,
    137 	.init = nvkm_bar_init,
    138 	.fini = nvkm_bar_fini,
    139 };
    140 
    141 void
    142 nvkm_bar_ctor(const struct nvkm_bar_func *func, struct nvkm_device *device,
    143 	      int index, struct nvkm_bar *bar)
    144 {
    145 	nvkm_subdev_ctor(&nvkm_bar, device, index, &bar->subdev);
    146 	bar->func = func;
    147 	spin_lock_init(&bar->lock);
    148 }
    149