mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-07-01 00:27:37 +03:00
623f3ccbe3
- ubb-vga.h (calloc_phys_vec), physmem.c: non-contiguous memory allocator (for now, without really considering any mapping to physical memory) - Makefile (OBJS): added physmem.o - ubb-vga.h (grabfb), grabfb.c (grabfb): API change for non-contiguous frame buffer - ubb-vga.h (ppmimg), ppmimg.c (convert, ppmimg): API change for non-contiguous frame buffer - ubb-vga.h (tstimg), tstimg.c (pixel, color_bars, grill, grid, sides, dot, line45, arc, printc, text, ctext, tstimg): API change for non-contiguous frame buffer - tstimg.c (tstimg): we no longer need to clear the frame buffer - ubb-vga.c (frame, session, main): use a vector of line buffers instead of a contiguous frame buffer
441 lines
8.7 KiB
C
441 lines
8.7 KiB
C
/*
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* ubb-vga.c - Output video on UBB with more or less VGA timing
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* WARNING: this program does very nasty things to the Ben and it doesn't
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* like company. In particular, it resents:
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*
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* - the MMC driver - disable it with
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* echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind
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* - the AT86RF230/1 kernel driver - use a kernel that doesn't have it
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* - anything that accesses the screen - kill GUI, X server, etc.
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* - the screen blanker - either disable it or make sure the screen stays
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* dark, e.g., with
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* echo 1 >/sys/devices/platform/jz4740-fb/graphics/fb0/blank
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* - probably a fair number of other daemons and things as well - best to
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* kill them all.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "regs4740.h"
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#include "ubb-vga.h"
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#define REG_BASE_PTR base
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static volatile void *base;
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static int bad;
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/* ----- I/O pin assignment ------------------------------------------------ */
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#define DAT0 (1 << 10)
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#define DAT1 (1 << 11)
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#define DAT2 (1 << 12)
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#define DAT3 (1 << 13)
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#define CMD (1 << 8)
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#define CLK (1 << 9)
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#define R DAT3
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#define G DAT0
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#define B DAT1
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#define Y DAT2
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#define HSYNC CMD
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#define VSYNC CLK
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/* ----- Ben hardware ------------------------------------------------------ */
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#define TIMER 7
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#define PAGE_SIZE 4096
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static uint32_t old_icmr;
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static uint32_t old_clkgr;
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static void disable_interrupts(void)
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{
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/*
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* @@@ Race condition alert ! If we get interrupted/preempted between
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* reading ICMR and masking all interrupts, and the code that runs
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* between these two operations changes ICMR, then we may set an
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* incorrect mask when restoring interrupts, which may hang the system.
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*/
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old_icmr = ICMR;
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ICMSR = 0xffffffff;
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}
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static void enable_interrupts(void)
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{
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ICMCR = ~old_icmr;
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}
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/*
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* @@@ Disabling the LCD clock will hang operations that depend on the LCD
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* subsystem to advance. This includes the screen saver.
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*/
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static void disable_lcd(void)
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{
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old_clkgr = CLKGR;
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CLKGR = old_clkgr | 1 << 10;
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}
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static void enable_lcd(void)
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{
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CLKGR = old_clkgr;
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}
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static void get_timer(void)
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{
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TSCR = 1 << TIMER; /* enable clock */
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TCSR(TIMER) = 1; /* count at PCLK/1 */
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TDFR(TIMER) = 0xffff; /* count to 0xffff */
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TESR = 1 << TIMER;
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}
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static void release_timer(void)
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{
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TECR = 1 << TIMER;
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TSSR = 1 << TIMER;
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}
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void *map(off_t addr, size_t size)
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{
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int fd;
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void *mem;
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fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (fd < 0) {
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perror("/dev/mem");
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exit(1);
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}
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mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr);
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if (mem == MAP_FAILED) {
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perror("mmap");
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exit(1);
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}
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return mem;
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}
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static void ben_setup(void)
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{
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base = map(SOC_BASE, PAGE_SIZE*3*16);
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/*
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* Ironically, switching the LCD clock on and off many times only
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* increases the risk of a hang. Therefore, we leave stop it during
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* all the measurements and only enable it again at the end.
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*/
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disable_lcd();
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get_timer();
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}
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static void cleanup(void)
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{
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release_timer();
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enable_lcd();
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}
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/* ----- Delay logic ------------------------------------------------------- */
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#define US(us) ((uint16_t) ((us)*112))
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static void until(uint16_t cycles)
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{
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while ((TCNT(TIMER) & 0xffff) < cycles);
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}
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/* ----- Frame buffer output ----------------------------------------------- */
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static const struct mode {
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const char *name;
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int xres, yres;
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int line_words; /* xres/8 */
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int clkdiv; /* pixel clock = 336 MHz/(clkdiv+1) */
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int line_cycles; /* 31.77 us for official VGA */
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int hsync_end; /* 0.79+3.77 us for official VGA */
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} mode_db[] = {
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{ "640x480", 640, 480, 640/8, 11, US(29.7), US(0.79+3.77-0.3) },
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{ "800x600", 800, 600, 800/8, 8, US(28.7), US(2.0+3.3+0.3) },
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/* the next one may work after adjusting the timing in "frame" */
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{ "800x600", 800, 600, 800/8, 8, US(28.2), US(2.0+3.3+0.3-0.3) },
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/* the 1024x768 below is not great but has good parameter tolerance */
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{ "1024x768", 1024, 768, 1024/8, 8, US(36.0), US(2.0+3.3) },
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/* illustrate underruns */
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{ "1024x768ur", 1024, 768, 1024/8, 7, US(33.5), US(0.4+2.1+0.5) },
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{ NULL }
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}, *mode = mode_db;
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void setup(void)
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{
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mlockall(MCL_CURRENT | MCL_FUTURE);
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ben_setup();
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PDFUNS = R | G | B | Y;
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PDFUNC = VSYNC | HSYNC;
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PDDIRS = VSYNC | HSYNC | R | G | B | Y;
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PDDATS = VSYNC | HSYNC;
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PDDATC = R | G | B | Y;
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MSCCDR = mode->clkdiv; /* set the MSC clock to 336 MHz / 12 = 28 MHz */
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CLKGR &= ~(1 << 7); /* enable MSC clock */
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MSC_CLKRT = 0; /* bus clock = MSC clock / 1 */
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}
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static void line(const uint32_t *line)
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{
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const uint32_t *p = line;
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uint32_t first;
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/* Back porch */
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TCNT(TIMER) = 0;
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MSC_STRPCL = 1 << 3; /* reset the MSC */
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// while (MSC_STAT & (1 << 15));
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first = *p++;
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until(US(0.79));
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/* HSYNC */
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PDDATC = HSYNC;
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MSC_STRPCL = 2; /* start MMC clock output */
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MSC_RESTO = 0xffff;
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MSC_CMDAT =
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(1 << 10) | /* 4 bit bus */
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(1 << 4) | /* write */
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(1 << 3) | /* with data transfer */
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1; /* R1 response */
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MSC_STRPCL = 4; /* START_OP */
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until(mode->hsync_end);
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/*
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* Adjustment value tests with the XEN-1510:
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*
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* Adjustment Tries Good Jam FIFO jitter
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* Quick load
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* -0.0 10 3 7 0 n
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* -0.1 10 5 5 0 n
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* -0.2 10 6 4 0 n
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* -0.3 10 7 3 0 n
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* 10 5 5 0 y
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* -0.4 10 1 0 9 n
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* 10 5 0 5 n repeat
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* 10 5 0 5 y
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* -0.5 10 3 0 7 n
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* 10 7 0 3 y
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* -1.0 5 0 5 0
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*
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* Good = image is stable
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* Jam = does not detect the signal properly, loss of HSYNC, artefacts,
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* or no image at all
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* FIFO jitter = some lines get shifted by a "digital" amount
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*/
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/* Front porch */
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MSC_TXFIFO = first;
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PDFUNS = CMD;
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PDDATS = HSYNC;
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PDFUNC = CMD;
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/*
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* We don't wait for the end of the front porch because the beginning
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* of pixel data is determined by the MSC. Instead, we make good use
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* of the delay to shovel bits into the MSC's FIFO.
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*/
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#if 1 /* quick load */
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MSC_TXFIFO = *p++; MSC_TXFIFO = *p++; MSC_TXFIFO = *p++;
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MSC_TXFIFO = *p++; MSC_TXFIFO = *p++; MSC_TXFIFO = *p++;
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MSC_TXFIFO = *p++; MSC_TXFIFO = *p++; MSC_TXFIFO = *p++;
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MSC_TXFIFO = *p++; MSC_TXFIFO = *p++; MSC_TXFIFO = *p++;
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MSC_TXFIFO = *p++; MSC_TXFIFO = *p++; MSC_TXFIFO = *p++;
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#endif
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while (p != line+mode->line_words) {
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uint8_t st;
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do {
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st = MSC_STAT;
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if (st & 3) {
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bad++;
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goto fail;
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}
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}
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while (st & (1 << 7));
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MSC_TXFIFO = *p++;
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}
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fail:
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until(mode->line_cycles);
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}
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static void hdelay(int cycles)
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{
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while (cycles--) {
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TCNT(TIMER) = 0;
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PDDATC = HSYNC;
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until(US(3.77));
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PDDATS = HSYNC;
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until(mode->line_cycles);
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}
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}
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static void frame(void *const *f)
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{
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void *const *p;
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/* VSYNC */
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PDDATC = VSYNC;
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hdelay(2);
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PDDATS = VSYNC;
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/* Front porch */
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hdelay(31);
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/*
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* The horizontal back porch of the previous line is handled inside
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* "line", so we have to wait for less than a full line here.
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*/
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TCNT(TIMER) = 0;
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PDDATC = HSYNC;
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until(US(3.77));
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PDDATS = HSYNC;
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until(mode->line_cycles-US(0.79));
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for (p = f; p != f+mode->yres; p++)
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line(*p);
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/* Back porch */
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hdelay(14);
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}
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/* ----- Command-line parsing and main loop -------------------------------- */
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static void session(void (*gen)(void **fb, int xres, int yres), int frames)
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{
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void **f;
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int i;
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ccube_init();
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f = calloc_phys_vec(mode->yres, mode->xres/2);
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gen(f, mode->xres, mode->yres);
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disable_interrupts();
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for (i = 0; i != frames; i++)
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frame(f);
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enable_interrupts();
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [-t] [-r resolution] frames [file]\n\n"
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" frames number of frames to display\n"
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" file PPM file\n\n"
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" -m mode select the display mode, default \"%s\"\n"
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" -t generate a test image\n"
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, name, mode_db[0].name);
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exit(1);
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}
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int main(int argc, char *const *argv)
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{
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void (*gen)(void **fb, int xres, int yres) = grabfb;
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int frames;
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int c;
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while ((c = getopt(argc, argv, "m:t")) != EOF)
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switch (c) {
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case 'm':
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for (mode = mode_db; mode->name; mode++)
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if (!strcmp(mode->name, optarg))
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break;
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if (!mode) {
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fprintf(stderr, "no resolution \"%s\"\n",
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optarg);
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exit(1);
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}
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break;
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case 't':
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gen = tstimg;
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break;
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default:
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usage(*argv);
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}
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switch (argc-optind) {
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case 2:
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img_name = argv[optind+1];
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gen = ppmimg;
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/* fall through */
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case 1:
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frames = atoi(argv[optind]);
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break;
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default:
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usage(*argv);
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}
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setup();
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session(gen, frames);
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cleanup();
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if (bad)
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printf("%d timeout%s\n", bad, bad == 1 ? "" : "s");
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return 0;
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}
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