--- /dev/null
+/*
+ * 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 = {
+ .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 = -1;
+
+#define FM2FB_MODE_PAL 0
+#define FM2FB_MODE_NTSC 1
+
+static struct fb_var_screeninfo fb_var_modes[] = {
+ {
+ /* 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 fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id);
+
+static struct zorro_device_id fm2fb_devices[] = {
+ { 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 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;
+ }
+ fb_info(info, "%s frame buffer device\n", 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");
Code Review / kvmfornfv.git / blobdiff