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/*
* Copyright (C) 2008 Maarten Maathuis.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "nv50_lut.h"
#include "nv50_fb.h"
#include "nv50_crtc.h"
#include "nv50_display.h"
static int nv50_lut_alloc(struct nv50_crtc *crtc)
{
struct mem_block *block;
struct drm_file *file_priv = kzalloc(sizeof(struct drm_file), GFP_KERNEL);
uint32_t flags = NOUVEAU_MEM_INTERNAL | NOUVEAU_MEM_FB | NOUVEAU_MEM_MAPPED;
NV50_DEBUG("\n");
/* Any file_priv should do as it's pointer is used as identification. */
block = nouveau_mem_alloc(crtc->dev, 0, 4096, flags, file_priv);
if (!block)
return -ENOMEM;
crtc->lut->block = block;
return 0;
}
static int nv50_lut_free(struct nv50_crtc *crtc)
{
struct drm_file *file_priv = crtc->lut->block->file_priv;
NV50_DEBUG("\n");
nouveau_mem_free(crtc->dev, crtc->lut->block);
kfree(file_priv);
return 0;
}
#define NV50_LUT_INDEX(val, w) ((val << (8 - w)) | (val >> ((w << 1) - 8)))
static int nv50_lut_set(struct nv50_crtc *crtc, uint16_t *red, uint16_t *green, uint16_t *blue)
{
uint32_t index = 0, i;
struct drm_nouveau_private *dev_priv = crtc->dev->dev_private;
void __iomem *lut = NULL;
NV50_DEBUG("\n");
if (!crtc->lut || !crtc->lut->block) {
DRM_ERROR("Something wrong with the LUT\n");
return -EINVAL;
}
/* 16 bits, red, green, blue, unused, total of 64 bits per index */
/* maybe switch to ioremap_wc once it becomes available. */
lut = ioremap(dev_priv->fb_phys + crtc->lut->block->start, crtc->lut->block->size);
if (!lut) {
DRM_ERROR("ioremap failed on LUT\n");
return -EINVAL;
}
/* 10 bits lut, with 14 bits values. */
switch (crtc->fb->depth) {
case 15:
/* R5G5B5 */
for (i = 0; i < 32; i++) {
index = NV50_LUT_INDEX(i, 5);
writew(red[i] >> 2, lut + 8*index + 0);
writew(green[i] >> 2, lut + 8*index + 2);
writew(blue[i] >> 2, lut + 8*index + 4);
}
break;
case 16:
/* R5G6B5 */
for (i = 0; i < 32; i++) {
index = NV50_LUT_INDEX(i, 5);
writew(red[i] >> 2, lut + 8*index + 0);
writew(blue[i] >> 2, lut + 8*index + 4);
}
/* Green has an extra bit. */
for (i = 0; i < 64; i++) {
index = NV50_LUT_INDEX(i, 6);
writew(green[i] >> 2, lut + 8*index + 2);
}
break;
default:
/* R8G8B8 */
for (i = 0; i < 256; i++) {
writew(red[i] >> 2, lut + 8*i + 0);
writew(green[i] >> 2, lut + 8*i + 2);
writew(blue[i] >> 2, lut + 8*i + 4);
}
break;
}
crtc->lut->depth = crtc->fb->depth;
/* Cleaning time. */
iounmap(lut);
return 0;
}
int nv50_lut_create(struct nv50_crtc *crtc)
{
int rval = 0;
NV50_DEBUG("\n");
if (!crtc)
return -EINVAL;
crtc->lut = kzalloc(sizeof(struct nv50_lut), GFP_KERNEL);
rval = nv50_lut_alloc(crtc);
if (rval != 0)
return rval;
/* lut will be inited when fb is bound */
crtc->lut->depth = 0;
/* function pointers */
crtc->lut->set = nv50_lut_set;
return 0;
}
int nv50_lut_destroy(struct nv50_crtc *crtc)
{
int rval = 0;
NV50_DEBUG("\n");
if (!crtc)
return -EINVAL;
rval = nv50_lut_free(crtc);
kfree(crtc->lut);
crtc->lut = NULL;
if (rval != 0)
return rval;
return 0;
}
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