625 lines
16 KiB
C
625 lines
16 KiB
C
/*
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* drivers/video/asiliantfb.c
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* frame buffer driver for Asiliant 69000 chip
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* Copyright (C) 2001-2003 Saito.K & Jeanne
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*
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* from driver/video/chipsfb.c and,
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*
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* drivers/video/asiliantfb.c -- frame buffer device for
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* Asiliant 69030 chip (formerly Intel, formerly Chips & Technologies)
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* Author: apc@agelectronics.co.uk
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* Copyright (C) 2000 AG Electronics
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* Note: the data sheets don't seem to be available from Asiliant.
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* They are available by searching developer.intel.com, but are not otherwise
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* linked to.
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*
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* This driver should be portable with minimal effort to the 69000 display
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* chip, and to the twin-display mode of the 69030.
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* Contains code from Thomas Hhenleitner <th@visuelle-maschinen.de> (thanks)
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*
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* Derived from the CT65550 driver chipsfb.c:
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* Copyright (C) 1998 Paul Mackerras
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* ...which was derived from the Powermac "chips" driver:
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* Copyright (C) 1997 Fabio Riccardi.
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* And from the frame buffer device for Open Firmware-initialized devices:
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* Copyright (C) 1997 Geert Uytterhoeven.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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/* Built in clock of the 69030 */
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static const unsigned Fref = 14318180;
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#define mmio_base (p->screen_base + 0x400000)
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#define mm_write_ind(num, val, ap, dp) do { \
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writeb((num), mmio_base + (ap)); writeb((val), mmio_base + (dp)); \
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} while (0)
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static void mm_write_xr(struct fb_info *p, u8 reg, u8 data)
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{
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mm_write_ind(reg, data, 0x7ac, 0x7ad);
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}
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#define write_xr(num, val) mm_write_xr(p, num, val)
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static void mm_write_fr(struct fb_info *p, u8 reg, u8 data)
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{
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mm_write_ind(reg, data, 0x7a0, 0x7a1);
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}
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#define write_fr(num, val) mm_write_fr(p, num, val)
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static void mm_write_cr(struct fb_info *p, u8 reg, u8 data)
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{
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mm_write_ind(reg, data, 0x7a8, 0x7a9);
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}
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#define write_cr(num, val) mm_write_cr(p, num, val)
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static void mm_write_gr(struct fb_info *p, u8 reg, u8 data)
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{
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mm_write_ind(reg, data, 0x79c, 0x79d);
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}
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#define write_gr(num, val) mm_write_gr(p, num, val)
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static void mm_write_sr(struct fb_info *p, u8 reg, u8 data)
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{
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mm_write_ind(reg, data, 0x788, 0x789);
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}
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#define write_sr(num, val) mm_write_sr(p, num, val)
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static void mm_write_ar(struct fb_info *p, u8 reg, u8 data)
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{
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readb(mmio_base + 0x7b4);
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mm_write_ind(reg, data, 0x780, 0x780);
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}
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#define write_ar(num, val) mm_write_ar(p, num, val)
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static int asiliantfb_pci_init(struct pci_dev *dp, const struct pci_device_id *);
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static int asiliantfb_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info);
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static int asiliantfb_set_par(struct fb_info *info);
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static int asiliantfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
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u_int transp, struct fb_info *info);
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static struct fb_ops asiliantfb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = asiliantfb_check_var,
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.fb_set_par = asiliantfb_set_par,
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.fb_setcolreg = asiliantfb_setcolreg,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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/* Calculate the ratios for the dot clocks without using a single long long
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* value */
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static void asiliant_calc_dclk2(u32 *ppixclock, u8 *dclk2_m, u8 *dclk2_n, u8 *dclk2_div)
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{
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unsigned pixclock = *ppixclock;
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unsigned Ftarget = 1000000 * (1000000 / pixclock);
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unsigned n;
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unsigned best_error = 0xffffffff;
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unsigned best_m = 0xffffffff,
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best_n = 0xffffffff;
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unsigned ratio;
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unsigned remainder;
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unsigned char divisor = 0;
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/* Calculate the frequency required. This is hard enough. */
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ratio = 1000000 / pixclock;
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remainder = 1000000 % pixclock;
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Ftarget = 1000000 * ratio + (1000000 * remainder) / pixclock;
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while (Ftarget < 100000000) {
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divisor += 0x10;
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Ftarget <<= 1;
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}
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ratio = Ftarget / Fref;
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remainder = Ftarget % Fref;
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/* This expresses the constraint that 150kHz <= Fref/n <= 5Mhz,
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* together with 3 <= n <= 257. */
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for (n = 3; n <= 257; n++) {
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unsigned m = n * ratio + (n * remainder) / Fref;
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/* 3 <= m <= 257 */
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if (m >= 3 && m <= 257) {
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unsigned new_error = Ftarget * n >= Fref * m ?
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((Ftarget * n) - (Fref * m)) : ((Fref * m) - (Ftarget * n));
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if (new_error < best_error) {
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best_n = n;
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best_m = m;
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best_error = new_error;
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}
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}
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/* But if VLD = 4, then 4m <= 1028 */
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else if (m <= 1028) {
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/* remember there are still only 8-bits of precision in m, so
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* avoid over-optimistic error calculations */
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unsigned new_error = Ftarget * n >= Fref * (m & ~3) ?
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((Ftarget * n) - (Fref * (m & ~3))) : ((Fref * (m & ~3)) - (Ftarget * n));
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if (new_error < best_error) {
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best_n = n;
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best_m = m;
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best_error = new_error;
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}
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}
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}
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if (best_m > 257)
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best_m >>= 2; /* divide m by 4, and leave VCO loop divide at 4 */
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else
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divisor |= 4; /* or set VCO loop divide to 1 */
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*dclk2_m = best_m - 2;
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*dclk2_n = best_n - 2;
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*dclk2_div = divisor;
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*ppixclock = pixclock;
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return;
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}
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static void asiliant_set_timing(struct fb_info *p)
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{
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unsigned hd = p->var.xres / 8;
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unsigned hs = (p->var.xres + p->var.right_margin) / 8;
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unsigned he = (p->var.xres + p->var.right_margin + p->var.hsync_len) / 8;
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unsigned ht = (p->var.left_margin + p->var.xres + p->var.right_margin + p->var.hsync_len) / 8;
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unsigned vd = p->var.yres;
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unsigned vs = p->var.yres + p->var.lower_margin;
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unsigned ve = p->var.yres + p->var.lower_margin + p->var.vsync_len;
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unsigned vt = p->var.upper_margin + p->var.yres + p->var.lower_margin + p->var.vsync_len;
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unsigned wd = (p->var.xres_virtual * ((p->var.bits_per_pixel+7)/8)) / 8;
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if ((p->var.xres == 640) && (p->var.yres == 480) && (p->var.pixclock == 39722)) {
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write_fr(0x01, 0x02); /* LCD */
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} else {
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write_fr(0x01, 0x01); /* CRT */
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}
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write_cr(0x11, (ve - 1) & 0x0f);
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write_cr(0x00, (ht - 5) & 0xff);
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write_cr(0x01, hd - 1);
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write_cr(0x02, hd);
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write_cr(0x03, ((ht - 1) & 0x1f) | 0x80);
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write_cr(0x04, hs);
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write_cr(0x05, (((ht - 1) & 0x20) <<2) | (he & 0x1f));
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write_cr(0x3c, (ht - 1) & 0xc0);
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write_cr(0x06, (vt - 2) & 0xff);
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write_cr(0x30, (vt - 2) >> 8);
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write_cr(0x07, 0x00);
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write_cr(0x08, 0x00);
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write_cr(0x09, 0x00);
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write_cr(0x10, (vs - 1) & 0xff);
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write_cr(0x32, ((vs - 1) >> 8) & 0xf);
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write_cr(0x11, ((ve - 1) & 0x0f) | 0x80);
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write_cr(0x12, (vd - 1) & 0xff);
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write_cr(0x31, ((vd - 1) & 0xf00) >> 8);
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write_cr(0x13, wd & 0xff);
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write_cr(0x41, (wd & 0xf00) >> 8);
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write_cr(0x15, (vs - 1) & 0xff);
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write_cr(0x33, ((vs - 1) >> 8) & 0xf);
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write_cr(0x38, ((ht - 5) & 0x100) >> 8);
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write_cr(0x16, (vt - 1) & 0xff);
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write_cr(0x18, 0x00);
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if (p->var.xres == 640) {
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writeb(0xc7, mmio_base + 0x784); /* set misc output reg */
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} else {
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writeb(0x07, mmio_base + 0x784); /* set misc output reg */
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}
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}
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static int asiliantfb_check_var(struct fb_var_screeninfo *var,
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struct fb_info *p)
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{
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unsigned long Ftarget, ratio, remainder;
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ratio = 1000000 / var->pixclock;
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remainder = 1000000 % var->pixclock;
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Ftarget = 1000000 * ratio + (1000000 * remainder) / var->pixclock;
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/* First check the constraint that the maximum post-VCO divisor is 32,
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* and the maximum Fvco is 220MHz */
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if (Ftarget > 220000000 || Ftarget < 3125000) {
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printk(KERN_ERR "asiliantfb dotclock must be between 3.125 and 220MHz\n");
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return -ENXIO;
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}
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var->xres_virtual = var->xres;
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var->yres_virtual = var->yres;
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if (var->bits_per_pixel == 24) {
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var->red.offset = 16;
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var->green.offset = 8;
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var->blue.offset = 0;
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var->red.length = var->blue.length = var->green.length = 8;
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} else if (var->bits_per_pixel == 16) {
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switch (var->red.offset) {
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case 11:
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var->green.length = 6;
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break;
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case 10:
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var->green.length = 5;
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break;
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default:
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return -EINVAL;
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}
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var->green.offset = 5;
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var->blue.offset = 0;
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var->red.length = var->blue.length = 5;
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} else if (var->bits_per_pixel == 8) {
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var->red.offset = var->green.offset = var->blue.offset = 0;
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var->red.length = var->green.length = var->blue.length = 8;
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}
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return 0;
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}
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static int asiliantfb_set_par(struct fb_info *p)
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{
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u8 dclk2_m; /* Holds m-2 value for register */
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u8 dclk2_n; /* Holds n-2 value for register */
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u8 dclk2_div; /* Holds divisor bitmask */
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/* Set pixclock */
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asiliant_calc_dclk2(&p->var.pixclock, &dclk2_m, &dclk2_n, &dclk2_div);
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/* Set color depth */
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if (p->var.bits_per_pixel == 24) {
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write_xr(0x81, 0x16); /* 24 bit packed color mode */
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write_xr(0x82, 0x00); /* Disable palettes */
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write_xr(0x20, 0x20); /* 24 bit blitter mode */
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} else if (p->var.bits_per_pixel == 16) {
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if (p->var.red.offset == 11)
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write_xr(0x81, 0x15); /* 16 bit color mode */
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else
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write_xr(0x81, 0x14); /* 15 bit color mode */
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write_xr(0x82, 0x00); /* Disable palettes */
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write_xr(0x20, 0x10); /* 16 bit blitter mode */
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} else if (p->var.bits_per_pixel == 8) {
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write_xr(0x0a, 0x02); /* Linear */
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write_xr(0x81, 0x12); /* 8 bit color mode */
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write_xr(0x82, 0x00); /* Graphics gamma enable */
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write_xr(0x20, 0x00); /* 8 bit blitter mode */
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}
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p->fix.line_length = p->var.xres * (p->var.bits_per_pixel >> 3);
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p->fix.visual = (p->var.bits_per_pixel == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
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write_xr(0xc4, dclk2_m);
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write_xr(0xc5, dclk2_n);
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write_xr(0xc7, dclk2_div);
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/* Set up the CR registers */
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asiliant_set_timing(p);
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return 0;
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}
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static int asiliantfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
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u_int transp, struct fb_info *p)
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{
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if (regno > 255)
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return 1;
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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/* Set hardware palete */
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writeb(regno, mmio_base + 0x790);
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udelay(1);
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writeb(red, mmio_base + 0x791);
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writeb(green, mmio_base + 0x791);
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writeb(blue, mmio_base + 0x791);
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if (regno < 16) {
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switch(p->var.red.offset) {
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case 10: /* RGB 555 */
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((u32 *)(p->pseudo_palette))[regno] =
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((red & 0xf8) << 7) |
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((green & 0xf8) << 2) |
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((blue & 0xf8) >> 3);
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break;
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case 11: /* RGB 565 */
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((u32 *)(p->pseudo_palette))[regno] =
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((red & 0xf8) << 8) |
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((green & 0xfc) << 3) |
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((blue & 0xf8) >> 3);
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break;
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case 16: /* RGB 888 */
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((u32 *)(p->pseudo_palette))[regno] =
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(red << 16) |
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(green << 8) |
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(blue);
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break;
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}
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}
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return 0;
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}
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struct chips_init_reg {
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unsigned char addr;
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unsigned char data;
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};
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static struct chips_init_reg chips_init_sr[] =
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{
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{0x00, 0x03}, /* Reset register */
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{0x01, 0x01}, /* Clocking mode */
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{0x02, 0x0f}, /* Plane mask */
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{0x04, 0x0e} /* Memory mode */
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};
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static struct chips_init_reg chips_init_gr[] =
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{
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{0x03, 0x00}, /* Data rotate */
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{0x05, 0x00}, /* Graphics mode */
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{0x06, 0x01}, /* Miscellaneous */
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{0x08, 0x00} /* Bit mask */
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};
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static struct chips_init_reg chips_init_ar[] =
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{
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{0x10, 0x01}, /* Mode control */
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{0x11, 0x00}, /* Overscan */
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{0x12, 0x0f}, /* Memory plane enable */
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{0x13, 0x00} /* Horizontal pixel panning */
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};
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static struct chips_init_reg chips_init_cr[] =
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{
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{0x0c, 0x00}, /* Start address high */
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{0x0d, 0x00}, /* Start address low */
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{0x40, 0x00}, /* Extended Start Address */
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{0x41, 0x00}, /* Extended Start Address */
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{0x14, 0x00}, /* Underline location */
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{0x17, 0xe3}, /* CRT mode control */
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{0x70, 0x00} /* Interlace control */
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};
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static struct chips_init_reg chips_init_fr[] =
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{
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{0x01, 0x02},
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{0x03, 0x08},
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{0x08, 0xcc},
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{0x0a, 0x08},
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{0x18, 0x00},
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{0x1e, 0x80},
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{0x40, 0x83},
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{0x41, 0x00},
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{0x48, 0x13},
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{0x4d, 0x60},
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{0x4e, 0x0f},
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{0x0b, 0x01},
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{0x21, 0x51},
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{0x22, 0x1d},
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{0x23, 0x5f},
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{0x20, 0x4f},
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{0x34, 0x00},
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{0x24, 0x51},
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{0x25, 0x00},
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{0x27, 0x0b},
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{0x26, 0x00},
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{0x37, 0x80},
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{0x33, 0x0b},
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{0x35, 0x11},
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{0x36, 0x02},
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{0x31, 0xea},
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{0x32, 0x0c},
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{0x30, 0xdf},
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{0x10, 0x0c},
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{0x11, 0xe0},
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{0x12, 0x50},
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{0x13, 0x00},
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{0x16, 0x03},
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{0x17, 0xbd},
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{0x1a, 0x00},
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};
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static struct chips_init_reg chips_init_xr[] =
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{
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{0xce, 0x00}, /* set default memory clock */
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{0xcc, 200 }, /* MCLK ratio M */
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{0xcd, 18 }, /* MCLK ratio N */
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{0xce, 0x90}, /* MCLK divisor = 2 */
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{0xc4, 209 },
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{0xc5, 118 },
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{0xc7, 32 },
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{0xcf, 0x06},
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{0x09, 0x01}, /* IO Control - CRT controller extensions */
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{0x0a, 0x02}, /* Frame buffer mapping */
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{0x0b, 0x01}, /* PCI burst write */
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{0x40, 0x03}, /* Memory access control */
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{0x80, 0x82}, /* Pixel pipeline configuration 0 */
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{0x81, 0x12}, /* Pixel pipeline configuration 1 */
|
|
{0x82, 0x08}, /* Pixel pipeline configuration 2 */
|
|
|
|
{0xd0, 0x0f},
|
|
{0xd1, 0x01},
|
|
};
|
|
|
|
static void chips_hw_init(struct fb_info *p)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_xr); ++i)
|
|
write_xr(chips_init_xr[i].addr, chips_init_xr[i].data);
|
|
write_xr(0x81, 0x12);
|
|
write_xr(0x82, 0x08);
|
|
write_xr(0x20, 0x00);
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_sr); ++i)
|
|
write_sr(chips_init_sr[i].addr, chips_init_sr[i].data);
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_gr); ++i)
|
|
write_gr(chips_init_gr[i].addr, chips_init_gr[i].data);
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_ar); ++i)
|
|
write_ar(chips_init_ar[i].addr, chips_init_ar[i].data);
|
|
/* Enable video output in attribute index register */
|
|
writeb(0x20, mmio_base + 0x780);
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_cr); ++i)
|
|
write_cr(chips_init_cr[i].addr, chips_init_cr[i].data);
|
|
for (i = 0; i < ARRAY_SIZE(chips_init_fr); ++i)
|
|
write_fr(chips_init_fr[i].addr, chips_init_fr[i].data);
|
|
}
|
|
|
|
static const struct fb_fix_screeninfo asiliantfb_fix = {
|
|
.id = "Asiliant 69000",
|
|
.type = FB_TYPE_PACKED_PIXELS,
|
|
.visual = FB_VISUAL_PSEUDOCOLOR,
|
|
.accel = FB_ACCEL_NONE,
|
|
.line_length = 640,
|
|
.smem_len = 0x200000, /* 2MB */
|
|
};
|
|
|
|
static const struct fb_var_screeninfo asiliantfb_var = {
|
|
.xres = 640,
|
|
.yres = 480,
|
|
.xres_virtual = 640,
|
|
.yres_virtual = 480,
|
|
.bits_per_pixel = 8,
|
|
.red = { .length = 8 },
|
|
.green = { .length = 8 },
|
|
.blue = { .length = 8 },
|
|
.height = -1,
|
|
.width = -1,
|
|
.vmode = FB_VMODE_NONINTERLACED,
|
|
.pixclock = 39722,
|
|
.left_margin = 48,
|
|
.right_margin = 16,
|
|
.upper_margin = 33,
|
|
.lower_margin = 10,
|
|
.hsync_len = 96,
|
|
.vsync_len = 2,
|
|
};
|
|
|
|
static int init_asiliant(struct fb_info *p, unsigned long addr)
|
|
{
|
|
int err;
|
|
|
|
p->fix = asiliantfb_fix;
|
|
p->fix.smem_start = addr;
|
|
p->var = asiliantfb_var;
|
|
p->fbops = &asiliantfb_ops;
|
|
p->flags = FBINFO_DEFAULT;
|
|
|
|
err = fb_alloc_cmap(&p->cmap, 256, 0);
|
|
if (err) {
|
|
printk(KERN_ERR "C&T 69000 fb failed to alloc cmap memory\n");
|
|
return err;
|
|
}
|
|
|
|
err = register_framebuffer(p);
|
|
if (err < 0) {
|
|
printk(KERN_ERR "C&T 69000 framebuffer failed to register\n");
|
|
fb_dealloc_cmap(&p->cmap);
|
|
return err;
|
|
}
|
|
|
|
fb_info(p, "Asiliant 69000 frame buffer (%dK RAM detected)\n",
|
|
p->fix.smem_len / 1024);
|
|
|
|
writeb(0xff, mmio_base + 0x78c);
|
|
chips_hw_init(p);
|
|
return 0;
|
|
}
|
|
|
|
static int asiliantfb_pci_init(struct pci_dev *dp,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
unsigned long addr, size;
|
|
struct fb_info *p;
|
|
int err;
|
|
|
|
if ((dp->resource[0].flags & IORESOURCE_MEM) == 0)
|
|
return -ENODEV;
|
|
addr = pci_resource_start(dp, 0);
|
|
size = pci_resource_len(dp, 0);
|
|
if (addr == 0)
|
|
return -ENODEV;
|
|
if (!request_mem_region(addr, size, "asiliantfb"))
|
|
return -EBUSY;
|
|
|
|
p = framebuffer_alloc(sizeof(u32) * 16, &dp->dev);
|
|
if (!p) {
|
|
release_mem_region(addr, size);
|
|
return -ENOMEM;
|
|
}
|
|
p->pseudo_palette = p->par;
|
|
p->par = NULL;
|
|
|
|
p->screen_base = ioremap(addr, 0x800000);
|
|
if (p->screen_base == NULL) {
|
|
release_mem_region(addr, size);
|
|
framebuffer_release(p);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pci_write_config_dword(dp, 4, 0x02800083);
|
|
writeb(3, p->screen_base + 0x400784);
|
|
|
|
err = init_asiliant(p, addr);
|
|
if (err) {
|
|
iounmap(p->screen_base);
|
|
release_mem_region(addr, size);
|
|
framebuffer_release(p);
|
|
return err;
|
|
}
|
|
|
|
pci_set_drvdata(dp, p);
|
|
return 0;
|
|
}
|
|
|
|
static void asiliantfb_remove(struct pci_dev *dp)
|
|
{
|
|
struct fb_info *p = pci_get_drvdata(dp);
|
|
|
|
unregister_framebuffer(p);
|
|
fb_dealloc_cmap(&p->cmap);
|
|
iounmap(p->screen_base);
|
|
release_mem_region(pci_resource_start(dp, 0), pci_resource_len(dp, 0));
|
|
framebuffer_release(p);
|
|
}
|
|
|
|
static const struct pci_device_id asiliantfb_pci_tbl[] = {
|
|
{ PCI_VENDOR_ID_CT, PCI_DEVICE_ID_CT_69000, PCI_ANY_ID, PCI_ANY_ID },
|
|
{ 0 }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, asiliantfb_pci_tbl);
|
|
|
|
static struct pci_driver asiliantfb_driver = {
|
|
.name = "asiliantfb",
|
|
.id_table = asiliantfb_pci_tbl,
|
|
.probe = asiliantfb_pci_init,
|
|
.remove = asiliantfb_remove,
|
|
};
|
|
|
|
static int __init asiliantfb_init(void)
|
|
{
|
|
if (fb_get_options("asiliantfb", NULL))
|
|
return -ENODEV;
|
|
|
|
return pci_register_driver(&asiliantfb_driver);
|
|
}
|
|
|
|
module_init(asiliantfb_init);
|
|
|
|
static void __exit asiliantfb_exit(void)
|
|
{
|
|
pci_unregister_driver(&asiliantfb_driver);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|