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acornfb.c
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/*
* linux/drivers/video/acornfb.c
*
* Copyright (C) 1998-2001 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Frame buffer code for Acorn platforms
*
* NOTE: Most of the modes with X!=640 will disappear shortly.
* NOTE: Startup setting of HS & VS polarity not supported.
* (do we need to support it if we're coming up in 640x480?)
*
* FIXME: (things broken by the "new improved" FBCON API)
* - Blanking 8bpp displays with VIDC
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/pgtable.h>
#include "acornfb.h"
/*
* VIDC machines can't do 16 or 32BPP modes.
*/
#ifdef HAS_VIDC
#undef FBCON_HAS_CFB16
#undef FBCON_HAS_CFB32
#endif
/*
* Default resolution.
* NOTE that it has to be supported in the table towards
* the end of this file.
*/
#define DEFAULT_XRES 640
#define DEFAULT_YRES 480
#define DEFAULT_BPP 4
/*
* define this to debug the video mode selection
*/
#undef DEBUG_MODE_SELECTION
/*
* Translation from RISC OS monitor types to actual
* HSYNC and VSYNC frequency ranges. These are
* probably not right, but they're the best info I
* have. Allow 1% either way on the nominal for TVs.
*/
#define NR_MONTYPES 6
static struct fb_monspecs monspecs[NR_MONTYPES] __initdata = {
{ /* TV */
.hfmin = 15469,
.hfmax = 15781,
.vfmin = 49,
.vfmax = 51,
}, { /* Multi Freq */
.hfmin = 0,
.hfmax = 99999,
.vfmin = 0,
.vfmax = 199,
}, { /* Hi-res mono */
.hfmin = 58608,
.hfmax = 58608,
.vfmin = 64,
.vfmax = 64,
}, { /* VGA */
.hfmin = 30000,
.hfmax = 70000,
.vfmin = 60,
.vfmax = 60,
}, { /* SVGA */
.hfmin = 30000,
.hfmax = 70000,
.vfmin = 56,
.vfmax = 75,
}, {
.hfmin = 30000,
.hfmax = 70000,
.vfmin = 60,
.vfmax = 60,
}
};
static struct fb_info fb_info;
static struct acornfb_par current_par;
static struct vidc_timing current_vidc;
extern unsigned int vram_size; /* set by setup.c */
#ifdef HAS_VIDC
#define MAX_SIZE 480*1024
/* CTL VIDC Actual
* 24.000 0 8.000
* 25.175 0 8.392
* 36.000 0 12.000
* 24.000 1 12.000
* 25.175 1 12.588
* 24.000 2 16.000
* 25.175 2 16.783
* 36.000 1 18.000
* 24.000 3 24.000
* 36.000 2 24.000
* 25.175 3 25.175
* 36.000 3 36.000
*/
struct pixclock {
u_long min_clock;
u_long max_clock;
u_int vidc_ctl;
u_int vid_ctl;
};
static struct pixclock arc_clocks[] = {
/* we allow +/-1% on these */
{ 123750, 126250, VIDC_CTRL_DIV3, VID_CTL_24MHz }, /* 8.000MHz */
{ 82500, 84167, VIDC_CTRL_DIV2, VID_CTL_24MHz }, /* 12.000MHz */
{ 61875, 63125, VIDC_CTRL_DIV1_5, VID_CTL_24MHz }, /* 16.000MHz */
{ 41250, 42083, VIDC_CTRL_DIV1, VID_CTL_24MHz }, /* 24.000MHz */
};
#ifdef CONFIG_ARCH_A5K
static struct pixclock a5k_clocks[] = {
{ 117974, 120357, VIDC_CTRL_DIV3, VID_CTL_25MHz }, /* 8.392MHz */
{ 78649, 80238, VIDC_CTRL_DIV2, VID_CTL_25MHz }, /* 12.588MHz */
{ 58987, 60178, VIDC_CTRL_DIV1_5, VID_CTL_25MHz }, /* 16.588MHz */
{ 55000, 56111, VIDC_CTRL_DIV2, VID_CTL_36MHz }, /* 18.000MHz */
{ 39325, 40119, VIDC_CTRL_DIV1, VID_CTL_25MHz }, /* 25.175MHz */
{ 27500, 28055, VIDC_CTRL_DIV1, VID_CTL_36MHz }, /* 36.000MHz */
};
#endif
static struct pixclock *
acornfb_valid_pixrate(struct fb_var_screeninfo *var)
{
u_long pixclock = var->pixclock;
u_int i;
if (!var->pixclock)
return NULL;
for (i = 0; i < ARRAY_SIZE(arc_clocks); i++)
if (pixclock > arc_clocks[i].min_clock &&
pixclock < arc_clocks[i].max_clock)
return arc_clocks + i;
#ifdef CONFIG_ARCH_A5K
if (machine_is_a5k()) {
for (i = 0; i < ARRAY_SIZE(a5k_clocks); i++)
if (pixclock > a5k_clocks[i].min_clock &&
pixclock < a5k_clocks[i].max_clock)
return a5k_clocks + i;
}
#endif
return NULL;
}
/* VIDC Rules:
* hcr : must be even (interlace, hcr/2 must be even)
* hswr : must be even
* hdsr : must be odd
* hder : must be odd
*
* vcr : must be odd
* vswr : >= 1
* vdsr : >= 1
* vder : >= vdsr
* if interlaced, then hcr/2 must be even
*/
static void
acornfb_set_timing(struct fb_var_screeninfo *var)
{
struct pixclock *pclk;
struct vidc_timing vidc;
u_int horiz_correction;
u_int sync_len, display_start, display_end, cycle;
u_int is_interlaced;
u_int vid_ctl, vidc_ctl;
u_int bandwidth;
memset(&vidc, 0, sizeof(vidc));
pclk = acornfb_valid_pixrate(var);
vidc_ctl = pclk->vidc_ctl;
vid_ctl = pclk->vid_ctl;
bandwidth = var->pixclock * 8 / var->bits_per_pixel;
/* 25.175, 4bpp = 79.444ns per byte, 317.776ns per word: fifo = 2,6 */
if (bandwidth > 143500)
vidc_ctl |= VIDC_CTRL_FIFO_3_7;
else if (bandwidth > 71750)
vidc_ctl |= VIDC_CTRL_FIFO_2_6;
else if (bandwidth > 35875)
vidc_ctl |= VIDC_CTRL_FIFO_1_5;
else
vidc_ctl |= VIDC_CTRL_FIFO_0_4;
switch (var->bits_per_pixel) {
case 1:
horiz_correction = 19;
vidc_ctl |= VIDC_CTRL_1BPP;
break;
case 2:
horiz_correction = 11;
vidc_ctl |= VIDC_CTRL_2BPP;
break;
case 4:
horiz_correction = 7;
vidc_ctl |= VIDC_CTRL_4BPP;
break;
default:
case 8:
horiz_correction = 5;
vidc_ctl |= VIDC_CTRL_8BPP;
break;
}
if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
vidc_ctl |= VIDC_CTRL_CSYNC;
else {
if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
vid_ctl |= VID_CTL_HS_NHSYNC;
if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
vid_ctl |= VID_CTL_VS_NVSYNC;
}
sync_len = var->hsync_len;
display_start = sync_len + var->left_margin;
display_end = display_start + var->xres;
cycle = display_end + var->right_margin;
/* if interlaced, then hcr/2 must be even */
is_interlaced = (var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED;
if (is_interlaced) {
vidc_ctl |= VIDC_CTRL_INTERLACE;
if (cycle & 2) {
cycle += 2;
var->right_margin += 2;
}
}
vidc.h_cycle = (cycle - 2) / 2;
vidc.h_sync_width = (sync_len - 2) / 2;
vidc.h_border_start = (display_start - 1) / 2;
vidc.h_display_start = (display_start - horiz_correction) / 2;
vidc.h_display_end = (display_end - horiz_correction) / 2;
vidc.h_border_end = (display_end - 1) / 2;
vidc.h_interlace = (vidc.h_cycle + 1) / 2;
sync_len = var->vsync_len;
display_start = sync_len + var->upper_margin;
display_end = display_start + var->yres;
cycle = display_end + var->lower_margin;
if (is_interlaced)
cycle = (cycle - 3) / 2;
else
cycle = cycle - 1;
vidc.v_cycle = cycle;
vidc.v_sync_width = sync_len - 1;
vidc.v_border_start = display_start - 1;
vidc.v_display_start = vidc.v_border_start;
vidc.v_display_end = display_end - 1;
vidc.v_border_end = vidc.v_display_end;
if (machine_is_a5k())
__raw_writeb(vid_ctl, IOEB_VID_CTL);
if (memcmp(¤t_vidc, &vidc, sizeof(vidc))) {
current_vidc = vidc;
vidc_writel(0xe0000000 | vidc_ctl);
vidc_writel(0x80000000 | (vidc.h_cycle << 14));
vidc_writel(0x84000000 | (vidc.h_sync_width << 14));
vidc_writel(0x88000000 | (vidc.h_border_start << 14));
vidc_writel(0x8c000000 | (vidc.h_display_start << 14));
vidc_writel(0x90000000 | (vidc.h_display_end << 14));
vidc_writel(0x94000000 | (vidc.h_border_end << 14));
vidc_writel(0x98000000);
vidc_writel(0x9c000000 | (vidc.h_interlace << 14));
vidc_writel(0xa0000000 | (vidc.v_cycle << 14));
vidc_writel(0xa4000000 | (vidc.v_sync_width << 14));
vidc_writel(0xa8000000 | (vidc.v_border_start << 14));
vidc_writel(0xac000000 | (vidc.v_display_start << 14));
vidc_writel(0xb0000000 | (vidc.v_display_end << 14));
vidc_writel(0xb4000000 | (vidc.v_border_end << 14));
vidc_writel(0xb8000000);
vidc_writel(0xbc000000);
}
#ifdef DEBUG_MODE_SELECTION
printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
var->yres, var->bits_per_pixel);
printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
printk(KERN_DEBUG " VIDC Ctrl (E) : 0x%08X\n", vidc_ctl);
printk(KERN_DEBUG " IOEB Ctrl : 0x%08X\n", vid_ctl);
#endif
}
static int
acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
union palette pal;
if (regno >= current_par.palette_size)
return 1;
pal.p = 0;
pal.vidc.reg = regno;
pal.vidc.red = red >> 12;
pal.vidc.green = green >> 12;
pal.vidc.blue = blue >> 12;
current_par.palette[regno] = pal;
vidc_writel(pal.p);
return 0;
}
#endif
#ifdef HAS_VIDC20
#include <asm/arch/acornfb.h>
#define MAX_SIZE 2*1024*1024
/* VIDC20 has a different set of rules from the VIDC:
* hcr : must be multiple of 4
* hswr : must be even
* hdsr : must be even
* hder : must be even
* vcr : >= 2, (interlace, must be odd)
* vswr : >= 1
* vdsr : >= 1
* vder : >= vdsr
*/
static void acornfb_set_timing(struct fb_info *info)
{
struct fb_var_screeninfo *var = &info->var;
struct vidc_timing vidc;
u_int vcr, fsize;
u_int ext_ctl, dat_ctl;
u_int words_per_line;
memset(&vidc, 0, sizeof(vidc));
vidc.h_sync_width = var->hsync_len - 8;
vidc.h_border_start = vidc.h_sync_width + var->left_margin + 8 - 12;
vidc.h_display_start = vidc.h_border_start + 12 - 18;
vidc.h_display_end = vidc.h_display_start + var->xres;
vidc.h_border_end = vidc.h_display_end + 18 - 12;
vidc.h_cycle = vidc.h_border_end + var->right_margin + 12 - 8;
vidc.h_interlace = vidc.h_cycle / 2;
vidc.v_sync_width = var->vsync_len - 1;
vidc.v_border_start = vidc.v_sync_width + var->upper_margin;
vidc.v_display_start = vidc.v_border_start;
vidc.v_display_end = vidc.v_display_start + var->yres;
vidc.v_border_end = vidc.v_display_end;
vidc.control = acornfb_default_control();
vcr = var->vsync_len + var->upper_margin + var->yres +
var->lower_margin;
if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
vidc.v_cycle = (vcr - 3) / 2;
vidc.control |= VIDC20_CTRL_INT;
} else
vidc.v_cycle = vcr - 2;
switch (var->bits_per_pixel) {
case 1: vidc.control |= VIDC20_CTRL_1BPP; break;
case 2: vidc.control |= VIDC20_CTRL_2BPP; break;
case 4: vidc.control |= VIDC20_CTRL_4BPP; break;
default:
case 8: vidc.control |= VIDC20_CTRL_8BPP; break;
case 16: vidc.control |= VIDC20_CTRL_16BPP; break;
case 32: vidc.control |= VIDC20_CTRL_32BPP; break;
}
acornfb_vidc20_find_rates(&vidc, var);
fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;
if (memcmp(¤t_vidc, &vidc, sizeof(vidc))) {
current_vidc = vidc;
vidc_writel(VIDC20_CTRL| vidc.control);
vidc_writel(0xd0000000 | vidc.pll_ctl);
vidc_writel(0x80000000 | vidc.h_cycle);
vidc_writel(0x81000000 | vidc.h_sync_width);
vidc_writel(0x82000000 | vidc.h_border_start);
vidc_writel(0x83000000 | vidc.h_display_start);
vidc_writel(0x84000000 | vidc.h_display_end);
vidc_writel(0x85000000 | vidc.h_border_end);
vidc_writel(0x86000000);
vidc_writel(0x87000000 | vidc.h_interlace);
vidc_writel(0x90000000 | vidc.v_cycle);
vidc_writel(0x91000000 | vidc.v_sync_width);
vidc_writel(0x92000000 | vidc.v_border_start);
vidc_writel(0x93000000 | vidc.v_display_start);
vidc_writel(0x94000000 | vidc.v_display_end);
vidc_writel(0x95000000 | vidc.v_border_end);
vidc_writel(0x96000000);
vidc_writel(0x97000000);
}
iomd_writel(fsize, IOMD_FSIZE);
ext_ctl = acornfb_default_econtrol();
if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
else {
if (var->sync & FB_SYNC_HOR_HIGH_ACT)
ext_ctl |= VIDC20_ECTL_HS_HSYNC;
else
ext_ctl |= VIDC20_ECTL_HS_NHSYNC;
if (var->sync & FB_SYNC_VERT_HIGH_ACT)
ext_ctl |= VIDC20_ECTL_VS_VSYNC;
else
ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
}
vidc_writel(VIDC20_ECTL | ext_ctl);
words_per_line = var->xres * var->bits_per_pixel / 32;
if (current_par.using_vram && info->fix.smem_len == 2048*1024)
words_per_line /= 2;
/* RiscPC doesn't use the VIDC's VRAM control. */
dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;
/* The data bus width is dependent on both the type
* and amount of video memory.
* DRAM 32bit low
* 1MB VRAM 32bit
* 2MB VRAM 64bit
*/
if (current_par.using_vram && current_par.vram_half_sam == 2048)
dat_ctl |= VIDC20_DCTL_BUS_D63_0;
else
dat_ctl |= VIDC20_DCTL_BUS_D31_0;
vidc_writel(VIDC20_DCTL | dat_ctl);
#ifdef DEBUG_MODE_SELECTION
printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
var->yres, var->bits_per_pixel);
printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08X\n", ext_ctl);
printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08X\n", vidc.pll_ctl);
printk(KERN_DEBUG " Ctrl (E) : 0x%08X\n", vidc.control);
printk(KERN_DEBUG " Data Ctrl (F) : 0x%08X\n", dat_ctl);
printk(KERN_DEBUG " Fsize : 0x%08X\n", fsize);
#endif
}
/*
* We have to take note of the VIDC20's 16-bit palette here.
* The VIDC20 looks up a 16 bit pixel as follows:
*
* bits 111111
* 5432109876543210
* red ++++++++ (8 bits, 7 to 0)
* green ++++++++ (8 bits, 11 to 4)
* blue ++++++++ (8 bits, 15 to 8)
*
* We use a pixel which looks like:
*
* bits 111111
* 5432109876543210
* red +++++ (5 bits, 4 to 0)
* green +++++ (5 bits, 9 to 5)
* blue +++++ (5 bits, 14 to 10)
*/
static int
acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
union palette pal;
if (regno >= current_par.palette_size)
return 1;
if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
u32 pseudo_val;
pseudo_val = regno << info->var.red.offset;
pseudo_val |= regno << info->var.green.offset;
pseudo_val |= regno << info->var.blue.offset;
((u32 *)info->pseudo_palette)[regno] = pseudo_val;
}
pal.p = 0;
pal.vidc20.red = red >> 8;
pal.vidc20.green = green >> 8;
pal.vidc20.blue = blue >> 8;
current_par.palette[regno] = pal;
if (info->var.bits_per_pixel == 16) {
int i;
pal.p = 0;
vidc_writel(0x10000000);
for (i = 0; i < 256; i += 1) {
pal.vidc20.red = current_par.palette[ i & 31].vidc20.red;
pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
pal.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue;
vidc_writel(pal.p);
/* Palette register pointer auto-increments */
}
} else {
vidc_writel(0x10000000 | regno);
vidc_writel(pal.p);
}
return 0;
}
#endif
/*
* Before selecting the timing parameters, adjust
* the resolution to fit the rules.
*/
static int
acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
{
u_int font_line_len, sam_size, min_size, size, nr_y;
/* xres must be even */
var->xres = (var->xres + 1) & ~1;
/*
* We don't allow xres_virtual to differ from xres
*/
var->xres_virtual = var->xres;
var->xoffset = 0;
if (current_par.using_vram)
sam_size = current_par.vram_half_sam * 2;
else
sam_size = 16;
/*
* Now, find a value for yres_virtual which allows
* us to do ywrap scrolling. The value of
* yres_virtual must be such that the end of the
* displayable frame buffer must be aligned with
* the start of a font line.
*/
font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
min_size = var->xres * var->yres * var->bits_per_pixel / 8;
/*
* If minimum screen size is greater than that we have
* available, reject it.
*/
if (min_size > info->fix.smem_len)
return -EINVAL;
/* Find int 'y', such that y * fll == s * sam < maxsize
* y = s * sam / fll; s = maxsize / sam
*/
for (size = info->fix.smem_len;
nr_y = size / font_line_len, min_size <= size;
size -= sam_size) {
if (nr_y * font_line_len == size)
break;
}
nr_y *= fontht;
if (var->accel_flags & FB_ACCELF_TEXT) {
if (min_size > size) {
/*
* failed, use ypan
*/
size = info->fix.smem_len;
var->yres_virtual = size / (font_line_len / fontht);
} else
var->yres_virtual = nr_y;
} else if (var->yres_virtual > nr_y)
var->yres_virtual = nr_y;
current_par.screen_end = info->fix.smem_start + size;
/*
* Fix yres & yoffset if needed.
*/
if (var->yres > var->yres_virtual)
var->yres = var->yres_virtual;
if (var->vmode & FB_VMODE_YWRAP) {
if (var->yoffset > var->yres_virtual)
var->yoffset = var->yres_virtual;
} else {
if (var->yoffset + var->yres > var->yres_virtual)
var->yoffset = var->yres_virtual - var->yres;
}
/* hsync_len must be even */
var->hsync_len = (var->hsync_len + 1) & ~1;
#ifdef HAS_VIDC
/* left_margin must be odd */
if ((var->left_margin & 1) == 0) {
var->left_margin -= 1;
var->right_margin += 1;
}
/* right_margin must be odd */
var->right_margin |= 1;
#elif defined(HAS_VIDC20)
/* left_margin must be even */
if (var->left_margin & 1) {
var->left_margin += 1;
var->right_margin -= 1;
}
/* right_margin must be even */
if (var->right_margin & 1)
var->right_margin += 1;
#endif
if (var->vsync_len < 1)
var->vsync_len = 1;
return 0;
}
static int
acornfb_validate_timing(struct fb_var_screeninfo *var,
struct fb_monspecs *monspecs)
{
unsigned long hs, vs;
/*
* hs(Hz) = 10^12 / (pixclock * xtotal)
* vs(Hz) = hs(Hz) / ytotal
*
* No need to do long long divisions or anything
* like that if you factor it correctly
*/
hs = 1953125000 / var->pixclock;
hs = hs * 512 /
(var->xres + var->left_margin + var->right_margin + var->hsync_len);
vs = hs /
(var->yres + var->upper_margin + var->lower_margin + var->vsync_len);
return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
}
static inline void
acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
{
u_int off = var->yoffset * info->fix.line_length;
#if defined(HAS_MEMC)
memc_write(VDMA_INIT, off >> 2);
#elif defined(HAS_IOMD)
iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
#endif
}
static int
acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
u_int fontht;
int err;
/*
* FIXME: Find the font height
*/
fontht = 8;
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
var->transp.msb_right = 0;
switch (var->bits_per_pixel) {
case 1: case 2: case 4: case 8:
var->red.offset = 0;
var->red.length = var->bits_per_pixel;
var->green = var->red;
var->blue = var->red;
var->transp.offset = 0;
var->transp.length = 0;
break;
#ifdef HAS_VIDC20
case 16:
var->red.offset = 0;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 5;
var->blue.offset = 10;
var->blue.length = 5;
var->transp.offset = 15;
var->transp.length = 1;
break;
case 32:
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 16;
var->blue.length = 8;
var->transp.offset = 24;
var->transp.length = 4;
break;
#endif
default:
return -EINVAL;
}
/*
* Check to see if the pixel rate is valid.
*/
if (!acornfb_valid_pixrate(var))
return -EINVAL;
/*
* Validate and adjust the resolution to
* match the video generator hardware.
*/
err = acornfb_adjust_timing(info, var, fontht);
if (err)
return err;
/*
* Validate the timing against the
* monitor hardware.
*/
return acornfb_validate_timing(var, &info->monspecs);
}
static int acornfb_set_par(struct fb_info *info)
{
switch (info->var.bits_per_pixel) {
case 1:
current_par.palette_size = 2;
info->fix.visual = FB_VISUAL_MONO10;
break;
case 2:
current_par.palette_size = 4;
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
case 4:
current_par.palette_size = 16;
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
case 8:
current_par.palette_size = VIDC_PALETTE_SIZE;
#ifdef HAS_VIDC
info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
#else
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
#endif
break;
#ifdef HAS_VIDC20
case 16:
current_par.palette_size = 32;
info->fix.visual = FB_VISUAL_DIRECTCOLOR;
break;
case 32:
current_par.palette_size = VIDC_PALETTE_SIZE;
info->fix.visual = FB_VISUAL_DIRECTCOLOR;
break;
#endif
default:
BUG();
}
info->fix.line_length = (info->var.xres * info->var.bits_per_pixel) / 8;
#if defined(HAS_MEMC)
{
unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;
memc_write(VDMA_START, 0);
memc_write(VDMA_END, size >> 2);
}
#elif defined(HAS_IOMD)
{
unsigned long start, size;
u_int control;
start = info->fix.smem_start;
size = current_par.screen_end;
if (current_par.using_vram) {
size -= current_par.vram_half_sam;
control = DMA_CR_E | (current_par.vram_half_sam / 256);
} else {
size -= 16;
control = DMA_CR_E | DMA_CR_D | 16;
}
iomd_writel(start, IOMD_VIDSTART);
iomd_writel(size, IOMD_VIDEND);
iomd_writel(control, IOMD_VIDCR);
}
#endif
acornfb_update_dma(info, &info->var);
acornfb_set_timing(info);
return 0;
}
static int
acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
u_int y_bottom = var->yoffset;
if (!(var->vmode & FB_VMODE_YWRAP))
y_bottom += var->yres;
BUG_ON(y_bottom > var->yres_virtual);
acornfb_update_dma(info, var);
return 0;
}
/*
* Note that we are entered with the kernel locked.
*/
static int
acornfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
unsigned long off, start;
u32 len;
off = vma->vm_pgoff << PAGE_SHIFT;
start = info->fix.smem_start;
len = PAGE_ALIGN(start & ~PAGE_MASK) + info->fix.smem_len;
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
off += start;
vma->vm_pgoff = off >> PAGE_SHIFT;
/* This is an IO map - tell maydump to skip this VMA */
vma->vm_flags |= VM_IO;
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
/*
* Don't alter the page protection flags; we want to keep the area
* cached for better performance. This does mean that we may miss
* some updates to the screen occasionally, but process switches
* should cause the caches and buffers to be flushed often enough.
*/
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
vma->vm_end - vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
return 0;
}
static struct fb_ops acornfb_ops = {
.owner = THIS_MODULE,
.fb_check_var = acornfb_check_var,
.fb_set_par = acornfb_set_par,
.fb_setcolreg = acornfb_setcolreg,
.fb_pan_display = acornfb_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_mmap = acornfb_mmap,
};
/*
* Everything after here is initialisation!!!
*/
static struct fb_videomode modedb[] __initdata = {
{ /* 320x256 @ 50Hz */
NULL, 50, 320, 256, 125000, 92, 62, 35, 19, 38, 2,
FB_SYNC_COMP_HIGH_ACT,
FB_VMODE_NONINTERLACED
}, { /* 640x250 @ 50Hz, 15.6 kHz hsync */
NULL, 50, 640, 250, 62500, 185, 123, 38, 21, 76, 3,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x256 @ 50Hz, 15.6 kHz hsync */
NULL, 50, 640, 256, 62500, 185, 123, 35, 18, 76, 3,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x512 @ 50Hz, 26.8 kHz hsync */
NULL, 50, 640, 512, 41667, 113, 87, 18, 1, 56, 3,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x250 @ 70Hz, 31.5 kHz hsync */
NULL, 70, 640, 250, 39722, 48, 16, 109, 88, 96, 2,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x256 @ 70Hz, 31.5 kHz hsync */
NULL, 70, 640, 256, 39722, 48, 16, 106, 85, 96, 2,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x352 @ 70Hz, 31.5 kHz hsync */
NULL, 70, 640, 352, 39722, 48, 16, 58, 37, 96, 2,
0,
FB_VMODE_NONINTERLACED
}, { /* 640x480 @ 60Hz, 31.5 kHz hsync */
NULL, 60, 640, 480, 39722, 48, 16, 32, 11, 96, 2,
0,
FB_VMODE_NONINTERLACED
}, { /* 800x600 @ 56Hz, 35.2 kHz hsync */
NULL, 56, 800, 600, 27778, 101, 23, 22, 1, 100, 2,
0,
FB_VMODE_NONINTERLACED
}, { /* 896x352 @ 60Hz, 21.8 kHz hsync */
NULL, 60, 896, 352, 41667, 59, 27, 9, 0, 118, 3,
0,
FB_VMODE_NONINTERLACED
}, { /* 1024x 768 @ 60Hz, 48.4 kHz hsync */
NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
0,
FB_VMODE_NONINTERLACED
}, { /* 1280x1024 @ 60Hz, 63.8 kHz hsync */
NULL, 60, 1280, 1024, 9090, 186, 96, 38, 1, 160, 3,
0,
FB_VMODE_NONINTERLACED
}
};
static struct fb_videomode __initdata
acornfb_default_mode = {
.name = NULL,
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 39722,
.left_margin = 56,
.right_margin = 16,
.upper_margin = 34,
.lower_margin = 9,
.hsync_len = 88,
.vsync_len = 2,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED
};