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