minix/drivers/fb/arch/earm/fb_arch.c
Thomas Cort 26f14d6b5d fb: auto-configure with EDID
Use EDID when available to configure the frame buffer driver with
good settings for the attached display.

Change-Id: I69a78155a93e55ffa1ca3ff6621a879a56cdbceb
2013-08-11 20:37:16 +02:00

414 lines
11 KiB
C

/* Architecture dependent part for the framebuffer on the OMAP3.
* There's obvious room for improvement.
*/
#include <minix/chardriver.h>
#include <minix/drivers.h>
#include <minix/fb.h>
#include <minix/type.h>
#include <minix/vm.h>
#include <minix/log.h>
#include <assert.h>
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <dev/videomode/videomode.h>
#include <dev/videomode/edidvar.h>
#include <dev/videomode/edidreg.h>
#include "dss.h"
#include "fb.h"
/* default / fallback resolution if EDID reading fails */
#define SCREEN_WIDTH 1024
#define SCREEN_HEIGHT 600
#define PAGES_NR 2
#define NSUPPORTED_MODES (4)
/* List of valid modes from TRM 7.1
* Other modes might work (like the default 1024x600), but no guarantees.
*/
struct supported_modes {
int hdisplay;
int vdisplay;
} omap_supported_modes[NSUPPORTED_MODES] = {
{ .hdisplay = 1024, .vdisplay = 768 }, /* XGA */
{ .hdisplay = 1280, .vdisplay = 800 }, /* WXGA */
{ .hdisplay = 1400, .vdisplay = 1050 }, /* SXGA+ */
{ .hdisplay = 1280, .vdisplay = 720 } /* HD 720p */
};
/* local function prototypes */
static struct videomode *choose_mode(struct edid_info *info);
static void configure_with_defaults(int minor);
static int configure_with_edid(int minor, struct edid_info *info);
/* globals */
static vir_bytes dss_phys_base; /* Address of dss phys memory map */
static vir_bytes dispc_phys_base; /* Address of dispc phys memory map */
static vir_bytes fb_vir;
static phys_bytes fb_phys;
static size_t fb_size;
static int initialized = 0;
struct panel_config {
u32_t timing_h;
u32_t timing_v;
u32_t pol_freq;
u32_t divisor;
u32_t lcd_size;
u32_t panel_type;
u32_t data_lines;
u32_t load_mode;
u32_t panel_color;
};
static const struct panel_config default_cfg = {
/* See OMAP TRM section 15.7 for the register values/encoding */
.timing_h = 0x1a4024c9, /* Horizontal timing */
.timing_v = 0x02c00509, /* Vertical timing */
.pol_freq = 0x00007028, /* Pol Freq */
.divisor = 0x00010001, /* 96MHz Pixel Clock */
.lcd_size = ((SCREEN_HEIGHT - 1) << 16 | (SCREEN_WIDTH - 1)),
.panel_type = 0x01, /* TFT */
.data_lines = 0x03, /* 24 Bit RGB */
.load_mode = 0x02, /* Frame Mode */
.panel_color = 0xFFFFFF /* WHITE */
};
static struct panel_config omap_cfg[FB_DEV_NR];
static const struct fb_fix_screeninfo default_fbfs = {
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
.line_length = SCREEN_WIDTH * 4,
.mmio_start = 0, /* Not implemented for char. special, so */
.mmio_len = 0 /* these are set to 0 */
};
static struct fb_fix_screeninfo omap_fbfs[FB_DEV_NR];
static const struct fb_var_screeninfo default_fbvs = {
.xres = SCREEN_WIDTH,
.yres = SCREEN_HEIGHT,
.xres_virtual = SCREEN_WIDTH,
.yres_virtual = SCREEN_HEIGHT*2,
.xoffset = 0,
.yoffset = 0,
.bits_per_pixel = 32,
.red = {
.offset = 16,
.length = 8,
.msb_right = 0
},
.green = {
.offset = 8,
.length = 8,
.msb_right = 0
},
.blue = {
.offset = 0,
.length = 8,
.msb_right = 0
},
.transp = {
.offset = 24,
.length = 8,
.msb_right = 0
}
};
static struct fb_var_screeninfo omap_fbvs[FB_DEV_NR];
/* logging - use with log_warn(), log_info(), log_debug(), log_trace() */
static struct log log = {
.name = "fb",
.log_level = LEVEL_INFO,
.log_func = default_log
};
static inline u32_t
readw(vir_bytes addr)
{
return *((volatile u32_t *) addr);
}
static inline void
writew(vir_bytes addr, u32_t val)
{
*((volatile u32_t *) addr) = val;
}
static struct videomode *
choose_mode(struct edid_info *info)
{
int i, j;
/* choose the highest resolution supported by both the SoC and screen */
for (i = info->edid_nmodes - 1; i >= 0; i--) {
for (j = NSUPPORTED_MODES - 1; j >= 0; j--) {
if (info->edid_modes[i].hdisplay ==
omap_supported_modes[j].hdisplay &&
info->edid_modes[i].vdisplay ==
omap_supported_modes[j].vdisplay) {
return &(info->edid_modes[i]);
}
}
}
return NULL;
}
static int
configure_with_edid(int minor, struct edid_info *info)
{
struct videomode *mode;
if (info == NULL || minor < 0 || minor >= FB_DEV_NR) {
log_warn(&log, "Invalid minor #%d or info == NULL\n", minor);
return -1;
}
/* If debugging or tracing, print the contents of info */
if (log.log_level >= LEVEL_DEBUG) {
log_debug(&log, "--- EDID - START ---\n");
edid_print(info);
log_debug(&log, "--- EDID - END ---\n");
}
/* Choose the preferred mode. */
mode = choose_mode(info);
if (mode == NULL) {
log_warn(&log, "Couldn't find a supported resolution.\n");
return -1;
}
/*
* apply the default settings since we don't overwrite every field
*/
configure_with_defaults(minor);
/*
* apply the settings corresponding to the given EDID
*/
/* panel_config */
omap_cfg[minor].lcd_size = ((mode->vdisplay - 1) << 16 | (mode->hdisplay - 1));
if (EDID_FEATURES_DISP_TYPE(info->edid_features) ==
EDID_FEATURES_DISP_TYPE_MONO) {
omap_cfg[minor].panel_type = 0x00; /* Mono */
} else {
omap_cfg[minor].panel_type = 0x01; /* RGB/Color */
}
/* fb_fix_screeninfo */
omap_fbfs[minor].line_length = mode->hdisplay * 4;
/* fb_var_screeninfo */
omap_fbvs[minor].xres = mode->hdisplay;
omap_fbvs[minor].yres = mode->vdisplay;
omap_fbvs[minor].xres_virtual = mode->hdisplay;
omap_fbvs[minor].yres_virtual = mode->vdisplay*2;
return OK;
}
static void
configure_with_defaults(int minor)
{
if (minor < 0 || minor >= FB_DEV_NR) {
log_warn(&log, "Invalid minor #%d\n", minor);
return;
}
/* copy the default values into this minor's configuration */
memcpy(&omap_cfg[minor], &default_cfg, sizeof(struct panel_config));
memcpy(&omap_fbfs[minor], &default_fbfs, sizeof(struct fb_fix_screeninfo));
memcpy(&omap_fbvs[minor], &default_fbvs, sizeof(struct fb_var_screeninfo));
}
static void
arch_configure_display(int minor)
{
/* Tell hardware where frame buffer is and turn display on */
u32_t off, rdispc;
if (!initialized) return;
if (minor != 0) return;
off = omap_fbvs[minor].yoffset * omap_fbvs[minor].xres_virtual * (omap_fbvs[minor].bits_per_pixel/8);
writew((vir_bytes) OMAP3_DISPC_GFX_BA0(dispc_phys_base),
fb_phys + (phys_bytes) off);
rdispc = readw((vir_bytes) OMAP3_DISPC_CONTROL(dispc_phys_base));
rdispc |= DISPC_LCDENABLE | DISPC_DIGITALENABLE | DISPC_GOLCD |
DISPC_GODIGITAL | DISPC_GPOUT0 | DISPC_GPOUT1;
writew((vir_bytes) OMAP3_DISPC_CONTROL(dispc_phys_base), rdispc);
}
int
arch_get_device(int minor, struct device *dev)
{
if (!initialized) return ENXIO;
if (minor != 0) return ENXIO;
dev->dv_base = fb_vir;
dev->dv_size = fb_size;
return OK;
}
int
arch_get_varscreeninfo(int minor, struct fb_var_screeninfo *fbvsp)
{
if (!initialized) return ENXIO;
if (minor != 0) return ENXIO;
*fbvsp = omap_fbvs[minor];
return OK;
}
int
arch_put_varscreeninfo(int minor, struct fb_var_screeninfo *fbvsp)
{
int r = OK;
assert(fbvsp != NULL);
if (!initialized) return ENXIO;
if (minor != 0) return ENXIO;
/* For now we only allow to play with the yoffset setting */
if (fbvsp->yoffset != omap_fbvs[minor].yoffset) {
if (fbvsp->yoffset < 0 || fbvsp->yoffset > omap_fbvs[minor].yres) {
return EINVAL;
}
omap_fbvs[minor].yoffset = fbvsp->yoffset;
}
/* Now update hardware with new settings */
arch_configure_display(minor);
return OK;
}
int
arch_get_fixscreeninfo(int minor, struct fb_fix_screeninfo *fbfsp)
{
if (!initialized) return ENXIO;
if (minor != 0) return ENXIO;
*fbfsp = omap_fbfs[minor];
return OK;
}
int
arch_pan_display(int minor, struct fb_var_screeninfo *fbvsp)
{
return arch_put_varscreeninfo(minor, fbvsp);
}
int
arch_fb_init(int minor, struct device *dev, struct edid_info *info)
{
int r;
u32_t rdispc;
struct minix_mem_range mr;
const struct panel_config *panel_cfg = &omap_cfg[minor];
assert(dev != NULL);
if (minor != 0) return ENXIO; /* We support only one minor */
if (initialized) {
dev->dv_base = fb_vir;
dev->dv_size = fb_size;
return OK;
} else if (info != NULL) {
log_debug(&log, "Configuring Settings based on EDID...\n");
r = configure_with_edid(minor, info);
if (r != OK) {
log_warn(&log, "EDID config failed. Using defaults.\n");
configure_with_defaults(minor);
}
} else {
log_debug(&log, "Loading Default Settings...\n");
configure_with_defaults(minor);
}
initialized = 1;
/* Configure DSS memory access */
mr.mr_base = OMAP3_DSS_BASE;
mr.mr_limit = mr.mr_base + 0x60;
if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != OK) {
panic("Unable to request access to DSS(1) memory");
}
dss_phys_base = (vir_bytes) vm_map_phys(SELF, (void *) OMAP3_DSS_BASE,
0x60);
if (dss_phys_base == (vir_bytes) MAP_FAILED) {
panic("Unable to request access to DSS(2) memory");
}
/* Configure DISPC memory access */
mr.mr_base = OMAP3_DISPC_BASE;
mr.mr_limit = mr.mr_base + 0x430;
if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != OK) {
panic("Unable to request access to DISPC(1) memory");
}
dispc_phys_base = (vir_bytes) vm_map_phys(SELF,
(void *) OMAP3_DISPC_BASE,
0x430);
if (dispc_phys_base == (vir_bytes) MAP_FAILED) {
panic("Unable to request access to DISPC(2) memory");
}
/* Set timings, screen mode, screen size, etc. */
writew(OMAP3_DISPC_TIMINGH(dispc_phys_base), panel_cfg->timing_h);
writew(OMAP3_DISPC_TIMINGV(dispc_phys_base), panel_cfg->timing_v);
writew(OMAP3_DISPC_POL_FREQ(dispc_phys_base), panel_cfg->pol_freq);
writew(OMAP3_DISPC_DIVISOR(dispc_phys_base), panel_cfg->divisor);
writew(OMAP3_DISPC_CONFIG(dispc_phys_base),
panel_cfg->load_mode << LOADMODE_SHIFT);
writew(OMAP3_DISPC_CONTROL(dispc_phys_base),
panel_cfg->panel_type << TFTSTN_SHIFT |
panel_cfg->data_lines << DATALINES_SHIFT);
writew((vir_bytes) OMAP3_DISPC_SIZE_LCD(dispc_phys_base),
panel_cfg->lcd_size);
writew((vir_bytes) OMAP3_DISPC_GFX_SIZE(dispc_phys_base),
panel_cfg->lcd_size);
writew(OMAP3_DISPC_DEFAULT_COLOR0(dispc_phys_base),
panel_cfg->panel_color);
/* Enable gfx engine */
writew(OMAP3_DISPC_GFX_ATTRIBUTES(dispc_phys_base),
(DISPC_GFXBURSTSIZE_16 << GFXBURSTSIZE_SHIFT) |
(DISPC_GFXFORMAT_RGB24 << GFXFORMAT_SHIFT) |
(DISPC_GFXENABLE));
writew(OMAP3_DISPC_GFX_ROW_INC(dispc_phys_base), 1);
writew(OMAP3_DISPC_GFX_PIXEL_INC(dispc_phys_base), 1);
/* Allocate contiguous physical memory for the display buffer */
fb_size = omap_fbvs[minor].yres_virtual * omap_fbvs[minor].xres_virtual *
(omap_fbvs[minor].bits_per_pixel / 8);
fb_vir = (vir_bytes) alloc_contig(fb_size, 0, &fb_phys);
if (fb_vir == (vir_bytes) MAP_FAILED) {
panic("Unable to allocate contiguous memory\n");
}
dev->dv_base = fb_vir;
dev->dv_size = fb_size;
/* Configure buffer settings and turn on LCD/Digital */
arch_configure_display(minor);
return OK;
}