mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Lucas De Marchi](/assets/img/avatar_default.png)
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
325 lines
9.1 KiB
C
325 lines
9.1 KiB
C
/*
|
|
* linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer
|
|
* device
|
|
*
|
|
* Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de)
|
|
* Copyright (C) 1999 Geert Uytterhoeven
|
|
*
|
|
* Written for 2.0.x by Steffen A. Mork
|
|
* Ported to 2.1.x by Geert Uytterhoeven
|
|
* Ported to new api by James Simmons
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/init.h>
|
|
#include <linux/zorro.h>
|
|
#include <asm/io.h>
|
|
|
|
/*
|
|
* Some technical notes:
|
|
*
|
|
* The BSC FrameMaster II (or Rainbow II) is a simple very dumb
|
|
* frame buffer which allows to display 24 bit true color images.
|
|
* Each pixel is 32 bit width so it's very easy to maintain the
|
|
* frame buffer. One long word has the following layout:
|
|
* AARRGGBB which means: AA the alpha channel byte, RR the red
|
|
* channel, GG the green channel and BB the blue channel.
|
|
*
|
|
* The FrameMaster II supports the following video modes.
|
|
* - PAL/NTSC
|
|
* - interlaced/non interlaced
|
|
* - composite sync/sync/sync over green
|
|
*
|
|
* The resolution is to the following both ones:
|
|
* - 768x576 (PAL)
|
|
* - 768x480 (NTSC)
|
|
*
|
|
* This means that pixel access per line is fixed due to the
|
|
* fixed line width. In case of maximal resolution the frame
|
|
* buffer needs an amount of memory of 1.769.472 bytes which
|
|
* is near to 2 MByte (the allocated address space of Zorro2).
|
|
* The memory is channel interleaved. That means every channel
|
|
* owns four VRAMs. Unfortunately most FrameMasters II are
|
|
* not assembled with memory for the alpha channel. In this
|
|
* case it could be possible to add the frame buffer into the
|
|
* normal memory pool.
|
|
*
|
|
* At relative address 0x1ffff8 of the frame buffers base address
|
|
* there exists a control register with the number of
|
|
* four control bits. They have the following meaning:
|
|
* bit value meaning
|
|
*
|
|
* 0 1 0=interlaced/1=non interlaced
|
|
* 1 2 0=video out disabled/1=video out enabled
|
|
* 2 4 0=normal mode as jumpered via JP8/1=complement mode
|
|
* 3 8 0=read onboard ROM/1 normal operation (required)
|
|
*
|
|
* As mentioned above there are several jumper. I think there
|
|
* is not very much information about the FrameMaster II in
|
|
* the world so I add these information for completeness.
|
|
*
|
|
* JP1 interlace selection (1-2 non interlaced/2-3 interlaced)
|
|
* JP2 wait state creation (leave as is!)
|
|
* JP3 wait state creation (leave as is!)
|
|
* JP4 modulate composite sync on green output (1-2 composite
|
|
* sync on green channel/2-3 normal composite sync)
|
|
* JP5 create test signal, shorting this jumper will create
|
|
* a white screen
|
|
* JP6 sync creation (1-2 composite sync/2-3 H-sync output)
|
|
* JP8 video mode (1-2 PAL/2-3 NTSC)
|
|
*
|
|
* With the following jumpering table you can connect the
|
|
* FrameMaster II to a normal TV via SCART connector:
|
|
* JP1: 2-3
|
|
* JP4: 2-3
|
|
* JP6: 2-3
|
|
* JP8: 1-2 (means PAL for Europe)
|
|
*
|
|
* NOTE:
|
|
* There is no other possibility to change the video timings
|
|
* except the interlaced/non interlaced, sync control and the
|
|
* video mode PAL (50 Hz)/NTSC (60 Hz). Inside this
|
|
* FrameMaster II driver are assumed values to avoid anomalies
|
|
* to a future X server. Except the pixel clock is really
|
|
* constant at 30 MHz.
|
|
*
|
|
* 9 pin female video connector:
|
|
*
|
|
* 1 analog red 0.7 Vss
|
|
* 2 analog green 0.7 Vss
|
|
* 3 analog blue 0.7 Vss
|
|
* 4 H-sync TTL
|
|
* 5 V-sync TTL
|
|
* 6 ground
|
|
* 7 ground
|
|
* 8 ground
|
|
* 9 ground
|
|
*
|
|
* Some performance notes:
|
|
* The FrameMaster II was not designed to display a console
|
|
* this driver would do! It was designed to display still true
|
|
* color images. Imagine: When scroll up a text line there
|
|
* must copied ca. 1.7 MBytes to another place inside this
|
|
* frame buffer. This means 1.7 MByte read and 1.7 MByte write
|
|
* over the slow 16 bit wide Zorro2 bus! A scroll of one
|
|
* line needs 1 second so do not expect to much from this
|
|
* driver - he is at the limit!
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* definitions
|
|
*/
|
|
|
|
#define FRAMEMASTER_SIZE 0x200000
|
|
#define FRAMEMASTER_REG 0x1ffff8
|
|
|
|
#define FRAMEMASTER_NOLACE 1
|
|
#define FRAMEMASTER_ENABLE 2
|
|
#define FRAMEMASTER_COMPL 4
|
|
#define FRAMEMASTER_ROM 8
|
|
|
|
static volatile unsigned char *fm2fb_reg;
|
|
|
|
static struct fb_fix_screeninfo fb_fix __devinitdata = {
|
|
.smem_len = FRAMEMASTER_REG,
|
|
.type = FB_TYPE_PACKED_PIXELS,
|
|
.visual = FB_VISUAL_TRUECOLOR,
|
|
.line_length = (768 << 2),
|
|
.mmio_len = (8),
|
|
.accel = FB_ACCEL_NONE,
|
|
};
|
|
|
|
static int fm2fb_mode __devinitdata = -1;
|
|
|
|
#define FM2FB_MODE_PAL 0
|
|
#define FM2FB_MODE_NTSC 1
|
|
|
|
static struct fb_var_screeninfo fb_var_modes[] __devinitdata = {
|
|
{
|
|
/* 768 x 576, 32 bpp (PAL) */
|
|
768, 576, 768, 576, 0, 0, 32, 0,
|
|
{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
|
|
0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
|
|
33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
|
|
}, {
|
|
/* 768 x 480, 32 bpp (NTSC - not supported yet */
|
|
768, 480, 768, 480, 0, 0, 32, 0,
|
|
{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
|
|
0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
|
|
33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Interface used by the world
|
|
*/
|
|
|
|
static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
|
|
u_int transp, struct fb_info *info);
|
|
static int fm2fb_blank(int blank, struct fb_info *info);
|
|
|
|
static struct fb_ops fm2fb_ops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_setcolreg = fm2fb_setcolreg,
|
|
.fb_blank = fm2fb_blank,
|
|
.fb_fillrect = cfb_fillrect,
|
|
.fb_copyarea = cfb_copyarea,
|
|
.fb_imageblit = cfb_imageblit,
|
|
};
|
|
|
|
/*
|
|
* Blank the display.
|
|
*/
|
|
static int fm2fb_blank(int blank, struct fb_info *info)
|
|
{
|
|
unsigned char t = FRAMEMASTER_ROM;
|
|
|
|
if (!blank)
|
|
t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE;
|
|
fm2fb_reg[0] = t;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set a single color register. The values supplied are already
|
|
* rounded down to the hardware's capabilities (according to the
|
|
* entries in the var structure). Return != 0 for invalid regno.
|
|
*/
|
|
static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
|
|
u_int transp, struct fb_info *info)
|
|
{
|
|
if (regno < 16) {
|
|
red >>= 8;
|
|
green >>= 8;
|
|
blue >>= 8;
|
|
|
|
((u32*)(info->pseudo_palette))[regno] = (red << 16) |
|
|
(green << 8) | blue;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialisation
|
|
*/
|
|
|
|
static int __devinit fm2fb_probe(struct zorro_dev *z,
|
|
const struct zorro_device_id *id);
|
|
|
|
static struct zorro_device_id fm2fb_devices[] __devinitdata = {
|
|
{ ZORRO_PROD_BSC_FRAMEMASTER_II },
|
|
{ ZORRO_PROD_HELFRICH_RAINBOW_II },
|
|
{ 0 }
|
|
};
|
|
MODULE_DEVICE_TABLE(zorro, fm2fb_devices);
|
|
|
|
static struct zorro_driver fm2fb_driver = {
|
|
.name = "fm2fb",
|
|
.id_table = fm2fb_devices,
|
|
.probe = fm2fb_probe,
|
|
};
|
|
|
|
static int __devinit fm2fb_probe(struct zorro_dev *z,
|
|
const struct zorro_device_id *id)
|
|
{
|
|
struct fb_info *info;
|
|
unsigned long *ptr;
|
|
int is_fm;
|
|
int x, y;
|
|
|
|
is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II;
|
|
|
|
if (!zorro_request_device(z,"fm2fb"))
|
|
return -ENXIO;
|
|
|
|
info = framebuffer_alloc(16 * sizeof(u32), &z->dev);
|
|
if (!info) {
|
|
zorro_release_device(z);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
|
|
framebuffer_release(info);
|
|
zorro_release_device(z);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* assigning memory to kernel space */
|
|
fb_fix.smem_start = zorro_resource_start(z);
|
|
info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE);
|
|
fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG;
|
|
fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG);
|
|
|
|
strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II");
|
|
|
|
/* make EBU color bars on display */
|
|
ptr = (unsigned long *)fb_fix.smem_start;
|
|
for (y = 0; y < 576; y++) {
|
|
for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */
|
|
for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */
|
|
}
|
|
fm2fb_blank(0, info);
|
|
|
|
if (fm2fb_mode == -1)
|
|
fm2fb_mode = FM2FB_MODE_PAL;
|
|
|
|
info->fbops = &fm2fb_ops;
|
|
info->var = fb_var_modes[fm2fb_mode];
|
|
info->pseudo_palette = info->par;
|
|
info->par = NULL;
|
|
info->fix = fb_fix;
|
|
info->flags = FBINFO_DEFAULT;
|
|
|
|
if (register_framebuffer(info) < 0) {
|
|
fb_dealloc_cmap(&info->cmap);
|
|
iounmap(info->screen_base);
|
|
framebuffer_release(info);
|
|
zorro_release_device(z);
|
|
return -EINVAL;
|
|
}
|
|
printk("fb%d: %s frame buffer device\n", info->node, fb_fix.id);
|
|
return 0;
|
|
}
|
|
|
|
int __init fm2fb_setup(char *options)
|
|
{
|
|
char *this_opt;
|
|
|
|
if (!options || !*options)
|
|
return 0;
|
|
|
|
while ((this_opt = strsep(&options, ",")) != NULL) {
|
|
if (!strncmp(this_opt, "pal", 3))
|
|
fm2fb_mode = FM2FB_MODE_PAL;
|
|
else if (!strncmp(this_opt, "ntsc", 4))
|
|
fm2fb_mode = FM2FB_MODE_NTSC;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __init fm2fb_init(void)
|
|
{
|
|
char *option = NULL;
|
|
|
|
if (fb_get_options("fm2fb", &option))
|
|
return -ENODEV;
|
|
fm2fb_setup(option);
|
|
return zorro_register_driver(&fm2fb_driver);
|
|
}
|
|
|
|
module_init(fm2fb_init);
|
|
MODULE_LICENSE("GPL");
|