- 根目录:
- drivers
- gpu
- drm
- cirrus
- cirrus_mode.c
/*
* Copyright 2012 Red Hat
*
* This file is subject to the terms and conditions of the GNU General
* Public License version 2. See the file COPYING in the main
* directory of this archive for more details.
*
* Authors: Matthew Garrett
* Dave Airlie
*
* Portions of this code derived from cirrusfb.c:
* drivers/video/cirrusfb.c - driver for Cirrus Logic chipsets
*
* Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
*/
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <video/cirrus.h>
#include "cirrus_drv.h"
#define CIRRUS_LUT_SIZE 256
#define PALETTE_INDEX 0x8
#define PALETTE_DATA 0x9
/*
* This file contains setup code for the CRTC.
*/
static void cirrus_crtc_load_lut(struct drm_crtc *crtc)
{
struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
struct drm_device *dev = crtc->dev;
struct cirrus_device *cdev = dev->dev_private;
int i;
if (!crtc->enabled)
return;
for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
/* VGA registers */
WREG8(PALETTE_INDEX, i);
WREG8(PALETTE_DATA, cirrus_crtc->lut_r[i]);
WREG8(PALETTE_DATA, cirrus_crtc->lut_g[i]);
WREG8(PALETTE_DATA, cirrus_crtc->lut_b[i]);
}
}
/*
* The DRM core requires DPMS functions, but they make little sense in our
* case and so are just stubs
*/
static void cirrus_crtc_dpms(struct drm_crtc *crtc, int mode)
{
struct drm_device *dev = crtc->dev;
struct cirrus_device *cdev = dev->dev_private;
u8 sr01, gr0e;
switch (mode) {
case DRM_MODE_DPMS_ON:
sr01 = 0x00;
gr0e = 0x00;
break;
case DRM_MODE_DPMS_STANDBY:
sr01 = 0x20;
gr0e = 0x02;
break;
case DRM_MODE_DPMS_SUSPEND:
sr01 = 0x20;
gr0e = 0x04;
break;
case DRM_MODE_DPMS_OFF:
sr01 = 0x20;
gr0e = 0x06;
break;
default:
return;
}
WREG8(SEQ_INDEX, 0x1);
sr01 |= RREG8(SEQ_DATA) & ~0x20;
WREG_SEQ(0x1, sr01);
WREG8(GFX_INDEX, 0xe);
gr0e |= RREG8(GFX_DATA) & ~0x06;
WREG_GFX(0xe, gr0e);
}
/*
* The core passes the desired mode to the CRTC code to see whether any
* CRTC-specific modifications need to be made to it. We're in a position
* to just pass that straight through, so this does nothing
*/
static bool cirrus_crtc_mode_fixup(struct drm_crtc *crtc,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
return true;
}
static void cirrus_set_start_address(struct drm_crtc *crtc, unsigned offset)
{
struct cirrus_device *cdev = crtc->dev->dev_private;
u32 addr;
u8 tmp;
addr = offset >> 2;
WREG_CRT(0x0c, (u8)((addr >> 8) & 0xff));
WREG_CRT(0x0d, (u8)(addr & 0xff));
WREG8(CRT_INDEX, 0x1b);
tmp = RREG8(CRT_DATA);
tmp &= 0xf2;
tmp |= (addr >> 16) & 0x01;
tmp |= (addr >> 15) & 0x0c;
WREG_CRT(0x1b, tmp);
WREG8(CRT_INDEX, 0x1d);
tmp = RREG8(CRT_DATA);
tmp &= 0x7f;
tmp |= (addr >> 12) & 0x80;
WREG_CRT(0x1d, tmp);
}
/* cirrus is different - we will force move buffers out of VRAM */
static int cirrus_crtc_do_set_base(struct drm_crtc *crtc,
struct drm_framebuffer *fb,
int x, int y, int atomic)
{
struct cirrus_device *cdev = crtc->dev->dev_private;
struct drm_gem_object *obj;
struct cirrus_framebuffer *cirrus_fb;
struct cirrus_bo *bo;
int ret;
u64 gpu_addr;
/* push the previous fb to system ram */
if (!atomic && fb) {
cirrus_fb = to_cirrus_framebuffer(fb);
obj = cirrus_fb->obj;
bo = gem_to_cirrus_bo(obj);
ret = cirrus_bo_reserve(bo, false);
if (ret)
return ret;
cirrus_bo_push_sysram(bo);
cirrus_bo_unreserve(bo);
}
cirrus_fb = to_cirrus_framebuffer(crtc->fb);
obj = cirrus_fb->obj;
bo = gem_to_cirrus_bo(obj);
ret = cirrus_bo_reserve(bo, false);
if (ret)
return ret;
ret = cirrus_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
if (ret) {
cirrus_bo_unreserve(bo);
return ret;
}
if (&cdev->mode_info.gfbdev->gfb == cirrus_fb) {
/* if pushing console in kmap it */
ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
if (ret)
DRM_ERROR("failed to kmap fbcon\n");
}
cirrus_bo_unreserve(bo);
cirrus_set_start_address(crtc, (u32)gpu_addr);
return 0;
}
static int cirrus_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *old_fb)
{
return cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
}
/*
* The meat of this driver. The core passes us a mode and we have to program
* it. The modesetting here is the bare minimum required to satisfy the qemu
* emulation of this hardware, and running this against a real device is
* likely to result in an inadequately programmed mode. We've already had
* the opportunity to modify the mode, so whatever we receive here should
* be something that can be correctly programmed and displayed
*/
static int cirrus_crtc_mode_set(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode,
int x, int y, struct drm_framebuffer *old_fb)
{
struct drm_device *dev = crtc->dev;
struct cirrus_device *cdev = dev->dev_private;
int hsyncstart, hsyncend, htotal, hdispend;
int vtotal, vdispend;
int tmp;
int sr07 = 0, hdr = 0;
htotal = mode->htotal / 8;
hsyncend = mode->hsync_end / 8;
hsyncstart = mode->hsync_start / 8;
hdispend = mode->hdisplay / 8;
vtotal = mode->vtotal;
vdispend = mode->vdisplay;
vdispend -= 1;
vtotal -= 2;
htotal -= 5;
hdispend -= 1;
hsyncstart += 1;
hsyncend += 1;
WREG_CRT(VGA_CRTC_V_SYNC_END, 0x20);
WREG_CRT(VGA_CRTC_H_TOTAL, htotal);
WREG_CRT(VGA_CRTC_H_DISP, hdispend);
WREG_CRT(VGA_CRTC_H_SYNC_START, hsyncstart);
WREG_CRT(VGA_CRTC_H_SYNC_END, hsyncend);
WREG_CRT(VGA_CRTC_V_TOTAL, vtotal & 0xff);
WREG_CRT(VGA_CRTC_V_DISP_END, vdispend & 0xff);
tmp = 0x40;
if ((vdispend + 1) & 512)
tmp |= 0x20;
WREG_CRT(VGA_CRTC_MAX_SCAN, tmp);
/*
* Overflow bits for values that don't fit in the standard registers
*/
tmp = 16;
if (vtotal & 256)
tmp |= 1;
if (vdispend & 256)
tmp |= 2;
if ((vdispend + 1) & 256)
tmp |= 8;
if (vtotal & 512)
tmp |= 32;
if (vdispend & 512)
tmp |= 64;
WREG_CRT(VGA_CRTC_OVERFLOW, tmp);
tmp = 0;
/* More overflow bits */
if ((htotal + 5) & 64)
tmp |= 16;
if ((htotal + 5) & 128)
tmp |= 32;
if (vtotal & 256)
tmp |= 64;
if (vtotal & 512)
tmp |= 128;
WREG_CRT(CL_CRT1A, tmp);
/* Disable Hercules/CGA compatibility */
WREG_CRT(VGA_CRTC_MODE, 0x03);
WREG8(SEQ_INDEX, 0x7);
sr07 = RREG8(SEQ_DATA);
sr07 &= 0xe0;
hdr = 0;
switch (crtc->fb->bits_per_pixel) {
case 8:
sr07 |= 0x11;
break;
case 16:
sr07 |= 0x17;
hdr = 0xc1;
break;
case 24:
sr07 |= 0x15;
hdr = 0xc5;
break;
case 32:
sr07 |= 0x19;
hdr = 0xc5;
break;
default:
return -1;
}
WREG_SEQ(0x7, sr07);
/* Program the pitch */
tmp = crtc->fb->pitches[0] / 8;
WREG_CRT(VGA_CRTC_OFFSET, tmp);
/* Enable extended blanking and pitch bits, and enable full memory */
tmp = 0x22;
tmp |= (crtc->fb->pitches[0] >> 7) & 0x10;
tmp |= (crtc->fb->pitches[0] >> 6) & 0x40;
WREG_CRT(0x1b, tmp);
/* Enable high-colour modes */
WREG_GFX(VGA_GFX_MODE, 0x40);
/* And set graphics mode */
WREG_GFX(VGA_GFX_MISC, 0x01);
WREG_HDR(hdr);
cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
return 0;
}
/*
* This is called before a mode is programmed. A typical use might be to
* enable DPMS during the programming to avoid seeing intermediate stages,
* but that's not relevant to us
*/
static void cirrus_crtc_prepare(struct drm_crtc *crtc)
{
}
/*
* This is called after a mode is programmed. It should reverse anything done
* by the prepare function
*/
static void cirrus_crtc_commit(struct drm_crtc *crtc)
{
}
/*
* The core can pass us a set of gamma values to program. We actually only
* use this for 8-bit mode so can't perform smooth fades on deeper modes,
* but it's a requirement that we provide the function
*/
static void cirrus_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
u16 *blue, uint32_t start, uint32_t size)
{
struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
int i;
if (size != CIRRUS_LUT_SIZE)
return;
for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
cirrus_crtc->lut_r[i] = red[i];
cirrus_crtc->lut_g[i] = green[i];
cirrus_crtc->lut_b[i] = blue[i];
}
cirrus_crtc_load_lut(crtc);
}
/* Simple cleanup function */
static void cirrus_crtc_destroy(struct drm_crtc *crtc)
{
struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
drm_crtc_cleanup(crtc);
kfree(cirrus_crtc);
}
/* These provide the minimum set of functions required to handle a CRTC */
static const struct drm_crtc_funcs cirrus_crtc_funcs = {
.gamma_set = cirrus_crtc_gamma_set,
.set_config = drm_crtc_helper_set_config,
.destroy = cirrus_crtc_destroy,
};
static const struct drm_crtc_helper_funcs cirrus_helper_funcs = {
.dpms = cirrus_crtc_dpms,
.mode_fixup = cirrus_crtc_mode_fixup,
.mode_set = cirrus_crtc_mode_set,
.mode_set_base = cirrus_crtc_mode_set_base,
.prepare = cirrus_crtc_prepare,
.commit = cirrus_crtc_commit,
.load_lut = cirrus_crtc_load_lut,
};
/* CRTC setup */
static void cirrus_crtc_init(struct drm_device *dev)
{
struct cirrus_device *cdev = dev->dev_private;
struct cirrus_crtc *cirrus_crtc;
int i;
cirrus_crtc = kzalloc(sizeof(struct cirrus_crtc) +
(CIRRUSFB_CONN_LIMIT * sizeof(struct drm_connector *)),
GFP_KERNEL);
if (cirrus_crtc == NULL)
return;
drm_crtc_init(dev, &cirrus_crtc->base, &cirrus_crtc_funcs);
drm_mode_crtc_set_gamma_size(&cirrus_crtc->base, CIRRUS_LUT_SIZE);
cdev->mode_info.crtc = cirrus_crtc;
for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
cirrus_crtc->lut_r[i] = i;
cirrus_crtc->lut_g[i] = i;
cirrus_crtc->lut_b[i] = i;
}
drm_crtc_helper_add(&cirrus_crtc->base, &cirrus_helper_funcs);
}
/** Sets the color ramps on behalf of fbcon */
void cirrus_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
u16 blue, int regno)
{
struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
cirrus_crtc->lut_r[regno] = red;
cirrus_crtc->lut_g[regno] = green;
cirrus_crtc->lut_b[regno] = blue;
}
/** Gets the color ramps on behalf of fbcon */
void cirrus_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
u16 *blue, int regno)
{
struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
*red = cirrus_crtc->lut_r[regno];
*green = cirrus_crtc->lut_g[regno];
*blue = cirrus_crtc->lut_b[regno];
}
static bool cirrus_encoder_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
return true;
}
static void cirrus_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
}
static void cirrus_encoder_dpms(struct drm_encoder *encoder, int state)
{
return;
}
static void cirrus_encoder_prepare(struct drm_encoder *encoder)
{
}
static void cirrus_encoder_commit(struct drm_encoder *encoder)
{
}
static void cirrus_encoder_destroy(struct drm_encoder *encoder)
{
struct cirrus_encoder *cirrus_encoder = to_cirrus_encoder(encoder);
drm_encoder_cleanup(encoder);
kfree(cirrus_encoder);
}
static const struct drm_encoder_helper_funcs cirrus_encoder_helper_funcs = {
.dpms = cirrus_encoder_dpms,
.mode_fixup = cirrus_encoder_mode_fixup,
.mode_set = cirrus_encoder_mode_set,
.prepare = cirrus_encoder_prepare,
.commit = cirrus_encoder_commit,
};
static const struct drm_encoder_funcs cirrus_encoder_encoder_funcs = {
.destroy = cirrus_encoder_destroy,
};
static struct drm_encoder *cirrus_encoder_init(struct drm_device *dev)
{
struct drm_encoder *encoder;
struct cirrus_encoder *cirrus_encoder;
cirrus_encoder = kzalloc(sizeof(struct cirrus_encoder), GFP_KERNEL);
if (!cirrus_encoder)
return NULL;
encoder = &cirrus_encoder->base;
encoder->possible_crtcs = 0x1;
drm_encoder_init(dev, encoder, &cirrus_encoder_encoder_funcs,
DRM_MODE_ENCODER_DAC);
drm_encoder_helper_add(encoder, &cirrus_encoder_helper_funcs);
return encoder;
}
static int cirrus_vga_get_modes(struct drm_connector *connector)
{
int count;
/* Just add a static list of modes */
count = drm_add_modes_noedid(connector, 1280, 1024);
drm_set_preferred_mode(connector, 1024, 768);
return count;
}
static int cirrus_vga_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
/* Any mode we've added is valid */
return MODE_OK;
}
static struct drm_encoder *cirrus_connector_best_encoder(struct drm_connector
*connector)
{
int enc_id = connector->encoder_ids[0];
struct drm_mode_object *obj;
struct drm_encoder *encoder;
/* pick the encoder ids */
if (enc_id) {
obj =
drm_mode_object_find(connector->dev, enc_id,
DRM_MODE_OBJECT_ENCODER);
if (!obj)
return NULL;
encoder = obj_to_encoder(obj);
return encoder;
}
return NULL;
}
static enum drm_connector_status cirrus_vga_detect(struct drm_connector
*connector, bool force)
{
return connector_status_connected;
}
static void cirrus_connector_destroy(struct drm_connector *connector)
{
drm_connector_cleanup(connector);
kfree(connector);
}
struct drm_connector_helper_funcs cirrus_vga_connector_helper_funcs = {
.get_modes = cirrus_vga_get_modes,
.mode_valid = cirrus_vga_mode_valid,
.best_encoder = cirrus_connector_best_encoder,
};
struct drm_connector_funcs cirrus_vga_connector_funcs = {
.dpms = drm_helper_connector_dpms,
.detect = cirrus_vga_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = cirrus_connector_destroy,
};
static struct drm_connector *cirrus_vga_init(struct drm_device *dev)
{
struct drm_connector *connector;
struct cirrus_connector *cirrus_connector;
cirrus_connector = kzalloc(sizeof(struct cirrus_connector), GFP_KERNEL);
if (!cirrus_connector)
return NULL;
connector = &cirrus_connector->base;
drm_connector_init(dev, connector,
&cirrus_vga_connector_funcs, DRM_MODE_CONNECTOR_VGA);
drm_connector_helper_add(connector, &cirrus_vga_connector_helper_funcs);
return connector;
}
int cirrus_modeset_init(struct cirrus_device *cdev)
{
struct drm_encoder *encoder;
struct drm_connector *connector;
int ret;
drm_mode_config_init(cdev->dev);
cdev->mode_info.mode_config_initialized = true;
cdev->dev->mode_config.max_width = CIRRUS_MAX_FB_WIDTH;
cdev->dev->mode_config.max_height = CIRRUS_MAX_FB_HEIGHT;
cdev->dev->mode_config.fb_base = cdev->mc.vram_base;
cdev->dev->mode_config.preferred_depth = 24;
/* don't prefer a shadow on virt GPU */
cdev->dev->mode_config.prefer_shadow = 0;
cirrus_crtc_init(cdev->dev);
encoder = cirrus_encoder_init(cdev->dev);
if (!encoder) {
DRM_ERROR("cirrus_encoder_init failed\n");
return -1;
}
connector = cirrus_vga_init(cdev->dev);
if (!connector) {
DRM_ERROR("cirrus_vga_init failed\n");
return -1;
}
drm_mode_connector_attach_encoder(connector, encoder);
ret = cirrus_fbdev_init(cdev);
if (ret) {
DRM_ERROR("cirrus_fbdev_init failed\n");
return ret;
}
return 0;
}
void cirrus_modeset_fini(struct cirrus_device *cdev)
{
cirrus_fbdev_fini(cdev);
if (cdev->mode_info.mode_config_initialized) {
drm_mode_config_cleanup(cdev->dev);
cdev->mode_info.mode_config_initialized = false;
}
}