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      1 /*	$NetBSD: nouveau_nvkm_subdev_bus_hwsq.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013 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 <bskeggs (at) redhat.com>
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bus_hwsq.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 struct nvkm_hwsq {
     32 	struct nvkm_subdev *subdev;
     33 	u32 addr;
     34 	u32 data;
     35 	struct {
     36 		u8 data[512];
     37 		u16 size;
     38 	} c;
     39 };
     40 
     41 static void
     42 hwsq_cmd(struct nvkm_hwsq *hwsq, int size, u8 data[])
     43 {
     44 	memcpy(&hwsq->c.data[hwsq->c.size], data, size * sizeof(data[0]));
     45 	hwsq->c.size += size;
     46 }
     47 
     48 int
     49 nvkm_hwsq_init(struct nvkm_subdev *subdev, struct nvkm_hwsq **phwsq)
     50 {
     51 	struct nvkm_hwsq *hwsq;
     52 
     53 	hwsq = *phwsq = kmalloc(sizeof(*hwsq), GFP_KERNEL);
     54 	if (hwsq) {
     55 		hwsq->subdev = subdev;
     56 		hwsq->addr = ~0;
     57 		hwsq->data = ~0;
     58 		memset(hwsq->c.data, 0x7f, sizeof(hwsq->c.data));
     59 		hwsq->c.size = 0;
     60 	}
     61 
     62 	return hwsq ? 0 : -ENOMEM;
     63 }
     64 
     65 int
     66 nvkm_hwsq_fini(struct nvkm_hwsq **phwsq, bool exec)
     67 {
     68 	struct nvkm_hwsq *hwsq = *phwsq;
     69 	int ret = 0, i;
     70 	if (hwsq) {
     71 		struct nvkm_subdev *subdev = hwsq->subdev;
     72 		struct nvkm_bus *bus = subdev->device->bus;
     73 		hwsq->c.size = (hwsq->c.size + 4) / 4;
     74 		if (hwsq->c.size <= bus->func->hwsq_size) {
     75 			if (exec)
     76 				ret = bus->func->hwsq_exec(bus,
     77 							   (u32 *)hwsq->c.data,
     78 								  hwsq->c.size);
     79 			if (ret)
     80 				nvkm_error(subdev, "hwsq exec failed: %d\n", ret);
     81 		} else {
     82 			nvkm_error(subdev, "hwsq ucode too large\n");
     83 			ret = -ENOSPC;
     84 		}
     85 
     86 		for (i = 0; ret && i < hwsq->c.size; i++)
     87 			nvkm_error(subdev, "\t%08x\n", ((u32 *)hwsq->c.data)[i]);
     88 
     89 		*phwsq = NULL;
     90 		kfree(hwsq);
     91 	}
     92 	return ret;
     93 }
     94 
     95 void
     96 nvkm_hwsq_wr32(struct nvkm_hwsq *hwsq, u32 addr, u32 data)
     97 {
     98 	nvkm_debug(hwsq->subdev, "R[%06x] = %08x\n", addr, data);
     99 
    100 	if (hwsq->data != data) {
    101 		if ((data & 0xffff0000) != (hwsq->data & 0xffff0000)) {
    102 			hwsq_cmd(hwsq, 5, (u8[]){ 0xe2, data, data >> 8,
    103 						  data >> 16, data >> 24 });
    104 		} else {
    105 			hwsq_cmd(hwsq, 3, (u8[]){ 0x42, data, data >> 8 });
    106 		}
    107 	}
    108 
    109 	if ((addr & 0xffff0000) != (hwsq->addr & 0xffff0000)) {
    110 		hwsq_cmd(hwsq, 5, (u8[]){ 0xe0, addr, addr >> 8,
    111 					  addr >> 16, addr >> 24 });
    112 	} else {
    113 		hwsq_cmd(hwsq, 3, (u8[]){ 0x40, addr, addr >> 8 });
    114 	}
    115 
    116 	hwsq->addr = addr;
    117 	hwsq->data = data;
    118 }
    119 
    120 void
    121 nvkm_hwsq_setf(struct nvkm_hwsq *hwsq, u8 flag, int data)
    122 {
    123 	nvkm_debug(hwsq->subdev, " FLAG[%02x] = %d\n", flag, data);
    124 	flag += 0x80;
    125 	if (data >= 0)
    126 		flag += 0x20;
    127 	if (data >= 1)
    128 		flag += 0x20;
    129 	hwsq_cmd(hwsq, 1, (u8[]){ flag });
    130 }
    131 
    132 void
    133 nvkm_hwsq_wait(struct nvkm_hwsq *hwsq, u8 flag, u8 data)
    134 {
    135 	nvkm_debug(hwsq->subdev, " WAIT[%02x] = %d\n", flag, data);
    136 	hwsq_cmd(hwsq, 3, (u8[]){ 0x5f, flag, data });
    137 }
    138 
    139 void
    140 nvkm_hwsq_wait_vblank(struct nvkm_hwsq *hwsq)
    141 {
    142 	struct nvkm_subdev *subdev = hwsq->subdev;
    143 	struct nvkm_device *device = subdev->device;
    144 	u32 heads, x, y, px = 0;
    145 	int i, head_sync;
    146 
    147 	heads = nvkm_rd32(device, 0x610050);
    148 	for (i = 0; i < 2; i++) {
    149 		/* Heuristic: sync to head with biggest resolution */
    150 		if (heads & (2 << (i << 3))) {
    151 			x = nvkm_rd32(device, 0x610b40 + (0x540 * i));
    152 			y = (x & 0xffff0000) >> 16;
    153 			x &= 0x0000ffff;
    154 			if ((x * y) > px) {
    155 				px = (x * y);
    156 				head_sync = i;
    157 			}
    158 		}
    159 	}
    160 
    161 	if (px == 0) {
    162 		nvkm_debug(subdev, "WAIT VBLANK !NO ACTIVE HEAD\n");
    163 		return;
    164 	}
    165 
    166 	nvkm_debug(subdev, "WAIT VBLANK HEAD%d\n", head_sync);
    167 	nvkm_hwsq_wait(hwsq, head_sync ? 0x3 : 0x1, 0x0);
    168 	nvkm_hwsq_wait(hwsq, head_sync ? 0x3 : 0x1, 0x1);
    169 }
    170 
    171 void
    172 nvkm_hwsq_nsec(struct nvkm_hwsq *hwsq, u32 nsec)
    173 {
    174 	u8 shift = 0, usec = nsec / 1000;
    175 	while (usec & ~3) {
    176 		usec >>= 2;
    177 		shift++;
    178 	}
    179 
    180 	nvkm_debug(hwsq->subdev, "    DELAY = %d ns\n", nsec);
    181 	hwsq_cmd(hwsq, 1, (u8[]){ 0x00 | (shift << 2) | usec });
    182 }
    183