acornfb.c
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上传日期:2013-02-24
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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?)
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/ctype.h>
- #include <linux/mm.h>
- #include <linux/tty.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/fb.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/mach-types.h>
- #include <asm/uaccess.h>
- #include <video/fbcon.h>
- #include <video/fbcon-mfb.h>
- #include <video/fbcon-cfb2.h>
- #include <video/fbcon-cfb4.h>
- #include <video/fbcon-cfb8.h>
- #include <video/fbcon-cfb16.h>
- #include <video/fbcon-cfb32.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
- /*
- * The order here defines which BPP we
- * pick depending on which resolutions
- * we have configured.
- */
- #if defined(FBCON_HAS_CFB4)
- # define DEFAULT_BPP 4
- #elif defined(FBCON_HAS_CFB8)
- # define DEFAULT_BPP 8
- #elif defined(FBCON_HAS_CFB16)
- # define DEFAULT_BPP 16
- #elif defined(FBCON_HAS_CFB2)
- # define DEFAULT_BPP 2
- #elif defined(FBCON_HAS_MFB)
- # define DEFAULT_BPP 1
- #else
- #error No suitable framebuffers configured
- #endif
- /*
- * 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 = {
- { 15469, 15781, 49, 51, 0 }, /* TV */
- { 0, 99999, 0, 99, 0 }, /* Multi Freq */
- { 58608, 58608, 64, 64, 0 }, /* Hi-res mono */
- { 30000, 70000, 60, 60, 0 }, /* VGA */
- { 30000, 70000, 56, 75, 0 }, /* SVGA */
- { 30000, 70000, 60, 60, 0 }
- };
- static struct display global_disp;
- static struct fb_info fb_info;
- static struct acornfb_par current_par;
- static struct vidc_timing current_vidc;
- static struct fb_var_screeninfo __initdata init_var = {};
- extern int acornfb_depth; /* set by setup.c */
- 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(u_long pixclock)
- {
- u_int i;
- 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->pixclock);
- 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 : %dn", vidc.h_cycle);
- printk(KERN_DEBUG " H-sync-width : %dn", vidc.h_sync_width);
- printk(KERN_DEBUG " H-border-start : %dn", vidc.h_border_start);
- printk(KERN_DEBUG " H-display-start : %dn", vidc.h_display_start);
- printk(KERN_DEBUG " H-display-end : %dn", vidc.h_display_end);
- printk(KERN_DEBUG " H-border-end : %dn", vidc.h_border_end);
- printk(KERN_DEBUG " H-interlace : %dn", vidc.h_interlace);
- printk(KERN_DEBUG " V-cycle : %dn", vidc.v_cycle);
- printk(KERN_DEBUG " V-sync-width : %dn", vidc.v_sync_width);
- printk(KERN_DEBUG " V-border-start : %dn", vidc.v_border_start);
- printk(KERN_DEBUG " V-display-start : %dn", vidc.v_display_start);
- printk(KERN_DEBUG " V-display-end : %dn", vidc.v_display_end);
- printk(KERN_DEBUG " V-border-end : %dn", vidc.v_border_end);
- printk(KERN_DEBUG " VIDC Ctrl (E) : 0x%08Xn", vidc_ctl);
- printk(KERN_DEBUG " IOEB Ctrl : 0x%08Xn", vid_ctl);
- #endif
- }
- static inline void
- acornfb_palette_write(u_int regno, union palette pal)
- {
- vidc_writel(pal.p);
- }
- static inline union palette
- acornfb_palette_encode(u_int regno, u_int red, u_int green, u_int blue,
- u_int trans)
- {
- union palette pal;
- pal.p = 0;
- pal.vidc.reg = regno;
- pal.vidc.red = red >> 12;
- pal.vidc.green = green >> 12;
- pal.vidc.blue = blue >> 12;
- return pal;
- }
- static void
- acornfb_palette_decode(u_int regno, u_int *red, u_int *green, u_int *blue,
- u_int *trans)
- {
- *red = EXTEND4(current_par.palette[regno].vidc.red);
- *green = EXTEND4(current_par.palette[regno].vidc.green);
- *blue = EXTEND4(current_par.palette[regno].vidc.blue);
- *trans = current_par.palette[regno].vidc.trans ? -1 : 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_var_screeninfo *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 && current_par.screen_size == 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 : %dn", vidc.h_cycle);
- printk(KERN_DEBUG " H-sync-width : %dn", vidc.h_sync_width);
- printk(KERN_DEBUG " H-border-start : %dn", vidc.h_border_start);
- printk(KERN_DEBUG " H-display-start : %dn", vidc.h_display_start);
- printk(KERN_DEBUG " H-display-end : %dn", vidc.h_display_end);
- printk(KERN_DEBUG " H-border-end : %dn", vidc.h_border_end);
- printk(KERN_DEBUG " H-interlace : %dn", vidc.h_interlace);
- printk(KERN_DEBUG " V-cycle : %dn", vidc.v_cycle);
- printk(KERN_DEBUG " V-sync-width : %dn", vidc.v_sync_width);
- printk(KERN_DEBUG " V-border-start : %dn", vidc.v_border_start);
- printk(KERN_DEBUG " V-display-start : %dn", vidc.v_display_start);
- printk(KERN_DEBUG " V-display-end : %dn", vidc.v_display_end);
- printk(KERN_DEBUG " V-border-end : %dn", vidc.v_border_end);
- printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08Xn", ext_ctl);
- printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08Xn", vidc.pll_ctl);
- printk(KERN_DEBUG " Ctrl (E) : 0x%08Xn", vidc.control);
- printk(KERN_DEBUG " Data Ctrl (F) : 0x%08Xn", dat_ctl);
- printk(KERN_DEBUG " Fsize : 0x%08Xn", fsize);
- #endif
- }
- static inline void
- acornfb_palette_write(u_int regno, union palette pal)
- {
- vidc_writel(0x10000000 | regno);
- vidc_writel(pal.p);
- }
- static inline union palette
- acornfb_palette_encode(u_int regno, u_int red, u_int green, u_int blue,
- u_int trans)
- {
- union palette pal;
- pal.p = 0;
- pal.vidc20.red = red >> 8;
- pal.vidc20.green = green >> 8;
- pal.vidc20.blue = blue >> 8;
- return pal;
- }
- static void
- acornfb_palette_decode(u_int regno, u_int *red, u_int *green, u_int *blue,
- u_int *trans)
- {
- *red = EXTEND8(current_par.palette[regno].vidc20.red);
- *green = EXTEND8(current_par.palette[regno].vidc20.green);
- *blue = EXTEND8(current_par.palette[regno].vidc20.blue);
- *trans = EXTEND4(current_par.palette[regno].vidc20.ext);
- }
- #endif
- /*
- * Before selecting the timing parameters, adjust
- * the resolution to fit the rules.
- */
- static int
- acornfb_adjust_timing(struct fb_var_screeninfo *var, int con)
- {
- u_int font_line_len;
- u_int fontht;
- u_int sam_size, min_size, size;
- u_int 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;
- /*
- * Find the font height
- */
- if (con == -1)
- fontht = fontheight(&global_disp);
- else
- fontht = fontheight(fb_display + con);
- if (fontht == 0)
- fontht = 8;
- 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 > current_par.screen_size)
- return -EINVAL;
- /* Find int 'y', such that y * fll == s * sam < maxsize
- * y = s * sam / fll; s = maxsize / sam
- */
- for (size = current_par.screen_size; min_size <= size;
- size -= sam_size) {
- nr_y = size / font_line_len;
- if (nr_y * font_line_len == size)
- break;
- }
- if (var->accel_flags & FB_ACCELF_TEXT) {
- if (min_size > size) {
- /*
- * failed, use ypan
- */
- size = current_par.screen_size;
- var->yres_virtual = size / (font_line_len / fontht);
- } else
- var->yres_virtual = nr_y * fontht;
- }
- current_par.screen_end = current_par.screen_base_p + 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_var_screeninfo *var)
- {
- int off = (var->yoffset * var->xres_virtual *
- var->bits_per_pixel) >> 3;
- #if defined(HAS_MEMC)
- memc_write(VDMA_INIT, off >> 2);
- #elif defined(HAS_IOMD)
- iomd_writel(current_par.screen_base_p + off, IOMD_VIDINIT);
- #endif
- }
- static int
- acornfb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
- u_int *trans, struct fb_info *info)
- {
- if (regno >= current_par.palette_size)
- return 1;
- acornfb_palette_decode(regno, red, green, blue, trans);
- return 0;
- }
- /*
- * 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;
- int bpp = fb_display[current_par.currcon].var.bits_per_pixel;
- if (regno >= current_par.palette_size)
- return 1;
- pal = acornfb_palette_encode(regno, red, green, blue, trans);
- current_par.palette[regno] = pal;
- #ifdef FBCON_HAS_CFB32
- if (bpp == 32 && regno < 16) {
- current_par.cmap.cfb32[regno] =
- regno | regno << 8 | regno << 16;
- }
- #endif
- #ifdef FBCON_HAS_CFB16
- if (bpp == 16 && regno < 16) {
- int i;
- current_par.cmap.cfb16[regno] =
- regno | regno << 5 | regno << 10;
- 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
- #endif
- acornfb_palette_write(regno, pal);
- return 0;
- }
- static int
- acornfb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- int err = 0;
- if (con == current_par.currcon)
- err = fb_get_cmap(cmap, kspc, acornfb_getcolreg, info);
- else if (fb_display[con].cmap.len)
- fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
- else
- fb_copy_cmap(fb_default_cmap(current_par.palette_size),
- cmap, kspc ? 0 : 2);
- return err;
- }
- static int
- acornfb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- int err = 0;
- if (!fb_display[con].cmap.len)
- err = fb_alloc_cmap(&fb_display[con].cmap,
- current_par.palette_size, 0);
- if (!err) {
- if (con == current_par.currcon)
- err = fb_set_cmap(cmap, kspc, acornfb_setcolreg,
- info);
- else
- fb_copy_cmap(cmap, &fb_display[con].cmap,
- kspc ? 0 : 1);
- }
- return err;
- }
- static int
- acornfb_decode_var(struct fb_var_screeninfo *var, int con)
- {
- int err;
- #if defined(HAS_VIDC20)
- var->red.offset = 0;
- var->red.length = 8;
- var->green = var->red;
- var->blue = var->red;
- var->transp.offset = 0;
- var->transp.length = 4;
- #elif defined(HAS_VIDC)
- var->red.length = 4;
- var->green = var->red;
- var->blue = var->red;
- var->transp.length = 1;
- #endif
- switch (var->bits_per_pixel) {
- #ifdef FBCON_HAS_MFB
- case 1:
- break;
- #endif
- #ifdef FBCON_HAS_CFB2
- case 2:
- break;
- #endif
- #ifdef FBCON_HAS_CFB4
- case 4:
- break;
- #endif
- #ifdef FBCON_HAS_CFB8
- case 8:
- break;
- #endif
- #ifdef FBCON_HAS_CFB16
- 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;
- #endif
- #ifdef FBCON_HAS_CFB32
- 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 (!var->pixclock || !acornfb_valid_pixrate(var->pixclock))
- return -EINVAL;
- /*
- * Validate and adjust the resolution to
- * match the video generator hardware.
- */
- err = acornfb_adjust_timing(var, con);
- if (err)
- return err;
- /*
- * Validate the timing against the
- * monitor hardware.
- */
- return acornfb_validate_timing(var, &fb_info.monspecs);
- }
- static int
- acornfb_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *info)
- {
- struct display *display;
- memset(fix, 0, sizeof(struct fb_fix_screeninfo));
- strcpy(fix->id, "Acorn");
- if (con >= 0)
- display = fb_display + con;
- else
- display = &global_disp;
- fix->smem_start = current_par.screen_base_p;
- fix->smem_len = current_par.screen_size;
- fix->type = display->type;
- fix->type_aux = display->type_aux;
- fix->xpanstep = 0;
- fix->ypanstep = display->ypanstep;
- fix->ywrapstep = display->ywrapstep;
- fix->visual = display->visual;
- fix->line_length = display->line_length;
- fix->accel = FB_ACCEL_NONE;
- return 0;
- }
- static int
- acornfb_get_var(struct fb_var_screeninfo *var, int con, struct fb_info *info)
- {
- if (con == -1) {
- *var = global_disp.var;
- } else
- *var = fb_display[con].var;
- return 0;
- }
- static int
- acornfb_set_var(struct fb_var_screeninfo *var, int con, struct fb_info *info)
- {
- struct display *display;
- int err, chgvar = 0;
- if (con >= 0)
- display = fb_display + con;
- else
- display = &global_disp;
- err = acornfb_decode_var(var, con);
- if (err)
- return err;
- switch (var->activate & FB_ACTIVATE_MASK) {
- case FB_ACTIVATE_TEST:
- return 0;
- case FB_ACTIVATE_NXTOPEN:
- case FB_ACTIVATE_NOW:
- break;
- default:
- return -EINVAL;
- }
- if (con >= 0) {
- if (display->var.xres != var->xres)
- chgvar = 1;
- if (display->var.yres != var->yres)
- chgvar = 1;
- if (display->var.xres_virtual != var->xres_virtual)
- chgvar = 1;
- if (display->var.yres_virtual != var->yres_virtual)
- chgvar = 1;
- if (memcmp(&display->var.red, &var->red, sizeof(var->red)))
- chgvar = 1;
- if (memcmp(&display->var.green, &var->green, sizeof(var->green)))
- chgvar = 1;
- if (memcmp(&display->var.blue, &var->blue, sizeof(var->blue)))
- chgvar = 1;
- }
- display->var = *var;
- display->var.activate &= ~FB_ACTIVATE_ALL;
- if (var->activate & FB_ACTIVATE_ALL)
- global_disp.var = display->var;
- switch (display->var.bits_per_pixel) {
- #ifdef FBCON_HAS_MFB
- case 1:
- current_par.palette_size = 2;
- display->dispsw = &fbcon_mfb;
- display->visual = FB_VISUAL_MONO10;
- break;
- #endif
- #ifdef FBCON_HAS_CFB2
- case 2:
- current_par.palette_size = 4;
- display->dispsw = &fbcon_cfb2;
- display->visual = FB_VISUAL_PSEUDOCOLOR;
- break;
- #endif
- #ifdef FBCON_HAS_CFB4
- case 4:
- current_par.palette_size = 16;
- display->dispsw = &fbcon_cfb4;
- display->visual = FB_VISUAL_PSEUDOCOLOR;
- break;
- #endif
- #ifdef FBCON_HAS_CFB8
- case 8:
- current_par.palette_size = VIDC_PALETTE_SIZE;
- display->dispsw = &fbcon_cfb8;
- #ifdef HAS_VIDC
- display->visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
- #else
- display->visual = FB_VISUAL_PSEUDOCOLOR;
- #endif
- break;
- #endif
- #ifdef FBCON_HAS_CFB16
- case 16:
- current_par.palette_size = 32;
- display->dispsw = &fbcon_cfb16;
- display->dispsw_data = current_par.cmap.cfb16;
- display->visual = FB_VISUAL_DIRECTCOLOR;
- break;
- #endif
- #ifdef FBCON_HAS_CFB32
- case 32:
- current_par.palette_size = VIDC_PALETTE_SIZE;
- display->dispsw = &fbcon_cfb32;
- display->dispsw_data = current_par.cmap.cfb32;
- display->visual = FB_VISUAL_TRUECOLOR;
- break;
- #endif
- default:
- display->dispsw = &fbcon_dummy;
- break;
- }
- display->screen_base = (char *)current_par.screen_base;
- display->type = FB_TYPE_PACKED_PIXELS;
- display->type_aux = 0;
- display->ypanstep = 1;
- display->ywrapstep = 1;
- display->line_length =
- display->next_line = (var->xres * var->bits_per_pixel) / 8;
- display->can_soft_blank = display->visual == FB_VISUAL_PSEUDOCOLOR ? 1 : 0;
- display->inverse = 0;
- if (chgvar && info && info->changevar)
- info->changevar(con);
- if (con == current_par.currcon) {
- struct fb_cmap *cmap;
- unsigned long start, size;
- int control;
- #if defined(HAS_MEMC)
- start = 0;
- size = current_par.screen_size - VDMA_XFERSIZE;
- control = 0;
- memc_write(VDMA_START, start);
- memc_write(VDMA_END, size >> 2);
- #elif defined(HAS_IOMD)
- start = current_par.screen_base_p;
- 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(var);
- acornfb_set_timing(var);
- if (display->cmap.len)
- cmap = &display->cmap;
- else
- cmap = fb_default_cmap(current_par.palette_size);
- fb_set_cmap(cmap, 1, acornfb_setcolreg, info);
- }
- return 0;
- }
- static int
- acornfb_pan_display(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- u_int y_bottom;
- if (var->xoffset)
- return -EINVAL;
- y_bottom = var->yoffset;
- if (!(var->vmode & FB_VMODE_YWRAP))
- y_bottom += var->yres;
- if (y_bottom > fb_display[con].var.yres_virtual)
- return -EINVAL;
- acornfb_update_dma(var);
- fb_display[con].var.yoffset = var->yoffset;
- if (var->vmode & FB_VMODE_YWRAP)
- fb_display[con].var.vmode |= FB_VMODE_YWRAP;
- else
- fb_display[con].var.vmode &= ~FB_VMODE_YWRAP;
- return 0;
- }
- /*
- * Note that we are entered with the kernel locked.
- */
- static int
- acornfb_mmap(struct fb_info *info, struct file *file, struct vm_area_struct *vma)
- {
- unsigned long off, start;
- u32 len;
- off = vma->vm_pgoff << PAGE_SHIFT;
- start = current_par.screen_base_p;
- len = PAGE_ALIGN(start & ~PAGE_MASK) + current_par.screen_size;
- 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;
- #ifdef CONFIG_CPU_32
- pgprot_val(vma->vm_page_prot) &= ~L_PTE_CACHEABLE;
- #endif
- /*
- * 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_page_range(vma->vm_start, off,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
- return 0;
- }
- static struct fb_ops acornfb_ops = {
- owner: THIS_MODULE,
- fb_get_fix: acornfb_get_fix,
- fb_get_var: acornfb_get_var,
- fb_set_var: acornfb_set_var,
- fb_get_cmap: acornfb_get_cmap,
- fb_set_cmap: acornfb_set_cmap,
- fb_pan_display: acornfb_pan_display,
- fb_mmap: acornfb_mmap,
- };
- static int
- acornfb_updatevar(int con, struct fb_info *info)
- {
- if (con == current_par.currcon)
- acornfb_update_dma(&fb_display[con].var);
- return 0;
- }
- static int
- acornfb_switch(int con, struct fb_info *info)
- {
- struct fb_cmap *cmap;
- if (current_par.currcon >= 0) {
- cmap = &fb_display[current_par.currcon].cmap;
- if (cmap->len)
- fb_get_cmap(cmap, 1, acornfb_getcolreg, info);
- }
- current_par.currcon = con;
- fb_display[con].var.activate = FB_ACTIVATE_NOW;
- acornfb_set_var(&fb_display[con].var, con, info);
- return 0;
- }
- static void
- acornfb_blank(int blank, struct fb_info *info)
- {
- union palette p;
- int i, bpp = fb_display[current_par.currcon].var.bits_per_pixel;
- #ifdef FBCON_HAS_CFB16
- if (bpp == 16) {
- p.p = 0;
- for (i = 0; i < 256; i++) {
- if (blank)
- p = acornfb_palette_encode(i, 0, 0, 0, 0);
- else {
- p.vidc20.red = current_par.palette[ i & 31].vidc20.red;
- p.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
- p.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue;
- }
- acornfb_palette_write(i, current_par.palette[i]);
- }
- } else
- #endif
- {
- for (i = 0; i < current_par.palette_size; i++) {
- if (blank)
- p = acornfb_palette_encode(i, 0, 0, 0, 0);
- else
- p = current_par.palette[i];
- acornfb_palette_write(i, p);
- }
- }
- }
- /*
- * 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
- };
- static void __init
- acornfb_init_fbinfo(void)
- {
- static int first = 1;
- if (!first)
- return;
- first = 0;
- strcpy(fb_info.modename, "Acorn");
- strcpy(fb_info.fontname, "Acorn8x8");
- fb_info.node = -1;
- fb_info.fbops = &acornfb_ops;
- fb_info.disp = &global_disp;
- fb_info.changevar = NULL;
- fb_info.switch_con = acornfb_switch;
- fb_info.updatevar = acornfb_updatevar;
- fb_info.blank = acornfb_blank;
- fb_info.flags = FBINFO_FLAG_DEFAULT;
- global_disp.dispsw = &fbcon_dummy;
- /*
- * setup initial parameters
- */
- memset(&init_var, 0, sizeof(init_var));
- #if defined(HAS_VIDC20)
- init_var.red.length = 8;
- init_var.transp.length = 4;
- #elif defined(HAS_VIDC)
- init_var.red.length = 4;
- init_var.transp.length = 1;
- #endif
- init_var.green = init_var.red;
- init_var.blue = init_var.red;
- init_var.nonstd = 0;
- init_var.activate = FB_ACTIVATE_NOW;
- init_var.height = -1;
- init_var.width = -1;
- init_var.vmode = FB_VMODE_NONINTERLACED;
- init_var.accel_flags = FB_ACCELF_TEXT;
- current_par.dram_size = 0;
- current_par.montype = -1;
- current_par.dpms = 0;
- }
- /*
- * setup acornfb options:
- *
- * font:fontname
- * Set fontname
- *
- * mon:hmin-hmax:vmin-vmax:dpms:width:height
- * Set monitor parameters:
- * hmin = horizontal minimum frequency (Hz)
- * hmax = horizontal maximum frequency (Hz) (optional)
- * vmin = vertical minimum frequency (Hz)
- * vmax = vertical maximum frequency (Hz) (optional)
- * dpms = DPMS supported? (optional)
- * width = width of picture in mm. (optional)
- * height = height of picture in mm. (optional)
- *
- * montype:type
- * Set RISC-OS style monitor type:
- * 0 (or tv) - TV frequency
- * 1 (or multi) - Multi frequency
- * 2 (or hires) - Hi-res monochrome
- * 3 (or vga) - VGA
- * 4 (or svga) - SVGA
- * auto, or option missing
- * - try hardware detect
- *
- * dram:size
- * Set the amount of DRAM to use for the frame buffer
- * (even if you have VRAM).
- * size can optionally be followed by 'M' or 'K' for
- * MB or KB respectively.
- */
- static void __init
- acornfb_parse_font(char *opt)
- {
- strcpy(fb_info.fontname, opt);
- }
- static void __init
- acornfb_parse_mon(char *opt)
- {
- char *p = opt;
- current_par.montype = -2;
- fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
- if (*p == '-')
- fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
- else
- fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;
- if (*p != ':')
- goto bad;
- fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
- if (*p == '-')
- fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
- else
- fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;
- if (*p != ':')
- goto check_values;
- fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);
- if (*p != ':')
- goto check_values;
- init_var.width = simple_strtoul(p + 1, &p, 0);
- if (*p != ':')
- goto check_values;
- init_var.height = simple_strtoul(p + 1, NULL, 0);
- check_values:
- if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
- fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
- goto bad;
- return;
- bad:
- printk(KERN_ERR "Acornfb: bad monitor settings: %sn", opt);
- current_par.montype = -1;
- }
- static void __init
- acornfb_parse_montype(char *opt)
- {
- current_par.montype = -2;
- if (strncmp(opt, "tv", 2) == 0) {
- opt += 2;
- current_par.montype = 0;
- } else if (strncmp(opt, "multi", 5) == 0) {
- opt += 5;
- current_par.montype = 1;
- } else if (strncmp(opt, "hires", 5) == 0) {
- opt += 5;
- current_par.montype = 2;
- } else if (strncmp(opt, "vga", 3) == 0) {
- opt += 3;
- current_par.montype = 3;
- } else if (strncmp(opt, "svga", 4) == 0) {
- opt += 4;
- current_par.montype = 4;
- } else if (strncmp(opt, "auto", 4) == 0) {
- opt += 4;
- current_par.montype = -1;
- } else if (isdigit(*opt))
- current_par.montype = simple_strtoul(opt, &opt, 0);
- if (current_par.montype == -2 ||
- current_par.montype > NR_MONTYPES) {
- printk(KERN_ERR "acornfb: unknown monitor type: %sn",
- opt);
- current_par.montype = -1;
- } else
- if (opt && *opt) {
- if (strcmp(opt, ",dpms") == 0)
- current_par.dpms = 1;
- else
- printk(KERN_ERR
- "acornfb: unknown monitor option: %sn",
- opt);
- }
- }
- static void __init
- acornfb_parse_dram(char *opt)
- {
- unsigned int size;
- size = simple_strtoul(opt, &opt, 0);
- if (opt) {
- switch (*opt) {
- case 'M':
- case 'm':
- size *= 1024;
- case 'K':
- case 'k':
- size *= 1024;
- default:
- break;
- }
- }
- current_par.dram_size = size;
- }
- static struct options {
- char *name;
- void (*parse)(char *opt);
- } opt_table[] __initdata = {
- { "font", acornfb_parse_font },
- { "mon", acornfb_parse_mon },
- { "montype", acornfb_parse_montype },
- { "dram", acornfb_parse_dram },
- { NULL, NULL }
- };
- int __init
- acornfb_setup(char *options)
- {
- struct options *optp;
- char *opt;
- if (!options || !*options)
- return 0;
- acornfb_init_fbinfo();
- while ((opt = strsep(&options, ",")) != NULL) {
- if (!*opt)
- continue;
- for (optp = opt_table; optp->name; optp++) {
- int optlen;
- optlen = strlen(optp->name);
- if (strncmp(opt, optp->name, optlen) == 0 &&
- opt[optlen] == ':') {
- optp->parse(opt + optlen + 1);
- break;
- }
- }
- if (!optp->name)
- printk(KERN_ERR "acornfb: unknown parameter: %sn",
- opt);
- }
- return 0;
- }
- /*
- * Detect type of monitor connected
- * For now, we just assume SVGA
- */
- static int __init
- acornfb_detect_monitortype(void)
- {
- return 4;
- }
- /*
- * This enables the unused memory to be freed on older Acorn machines.
- */
- static inline void
- free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
- {
- int mb_freed = 0;
- /*
- * Align addresses
- */
- virtual_start = PAGE_ALIGN(virtual_start);
- virtual_end = PAGE_ALIGN(virtual_end);
- while (virtual_start < virtual_end) {
- struct page *page;
- /*
- * Clear page reserved bit,
- * set count to 1, and free
- * the page.
- */
- page = virt_to_page(virtual_start);
- ClearPageReserved(page);
- atomic_set(&page->count, 1);
- free_page(virtual_start);
- virtual_start += PAGE_SIZE;
- mb_freed += PAGE_SIZE / 1024;
- }
- printk("acornfb: freed %dK memoryn", mb_freed);
- }
- int __init
- acornfb_init(void)
- {
- unsigned long size;
- u_int h_sync, v_sync;
- int rc, i;
- acornfb_init_fbinfo();
- if (current_par.montype == -1)
- current_par.montype = acornfb_detect_monitortype();
- if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
- current_par.montype = 4;
- if (current_par.montype >= 0) {
- fb_info.monspecs = monspecs[current_par.montype];
- fb_info.monspecs.dpms = current_par.dpms;
- }
- /*
- * Try to select a suitable default mode
- */
- for (i = 0; i < sizeof(modedb) / sizeof(*modedb); i++) {
- unsigned long hs;
- hs = modedb[i].refresh *
- (modedb[i].yres + modedb[i].upper_margin +
- modedb[i].lower_margin + modedb[i].vsync_len);
- if (modedb[i].xres == DEFAULT_XRES &&
- modedb[i].yres == DEFAULT_YRES &&
- modedb[i].refresh >= fb_info.monspecs.vfmin &&
- modedb[i].refresh <= fb_info.monspecs.vfmax &&
- hs >= fb_info.monspecs.hfmin &&
- hs <= fb_info.monspecs.hfmax) {
- acornfb_default_mode = modedb[i];
- break;
- }
- }
- current_par.currcon = -1;
- current_par.screen_base = SCREEN_BASE;
- current_par.screen_base_p = SCREEN_START;
- current_par.using_vram = 0;
- /*
- * If vram_size is set, we are using VRAM in
- * a Risc PC. However, if the user has specified
- * an amount of DRAM then use that instead.
- */
- if (vram_size && !current_par.dram_size) {
- size = vram_size;
- current_par.vram_half_sam = vram_size / 1024;
- current_par.using_vram = 1;
- } else if (current_par.dram_size)
- size = current_par.dram_size;
- else
- size = MAX_SIZE;
- /*
- * Limit maximum screen size.
- */
- if (size > MAX_SIZE)
- size = MAX_SIZE;
- size = PAGE_ALIGN(size);
- #if defined(HAS_VIDC20)
- if (!current_par.using_vram) {
- /*
- * RiscPC needs to allocate the DRAM memory
- * for the framebuffer if we are not using
- * VRAM. Archimedes/A5000 machines use a
- * fixed address for their framebuffers.
- */
- int order = 0;
- unsigned long page, top;
- while (size > (PAGE_SIZE * (1 << order)))
- order++;
- current_par.screen_base = __get_free_pages(GFP_KERNEL, order);
- if (current_par.screen_base == 0) {
- printk(KERN_ERR "acornfb: unable to allocate screen "
- "memoryn");
- return -ENOMEM;
- }
- top = current_par.screen_base + (PAGE_SIZE * (1 << order));
- /* Mark the framebuffer pages as reserved so mmap will work. */
- for (page = current_par.screen_base;
- page < PAGE_ALIGN(current_par.screen_base + size);
- page += PAGE_SIZE)
- SetPageReserved(virt_to_page(page));
- /* Hand back any excess pages that we allocated. */
- for (page = current_par.screen_base + size; page < top; page += PAGE_SIZE)
- free_page(page);
- current_par.screen_base_p =
- virt_to_phys((void *)current_par.screen_base);
- }
- #endif
- #if defined(HAS_VIDC)
- /*
- * Free unused pages
- */
- free_unused_pages(PAGE_OFFSET + size, PAGE_OFFSET + MAX_SIZE);
- #endif
-
- current_par.screen_size = size;
- current_par.palette_size = VIDC_PALETTE_SIZE;
- /*
- * Lookup the timing for this resolution. If we can't
- * find it, then we can't restore it if we change
- * the resolution, so we disable this feature.
- */
- do {
- rc = fb_find_mode(&init_var, &fb_info, NULL, modedb,
- sizeof(modedb) / sizeof(*modedb),
- &acornfb_default_mode, DEFAULT_BPP);
- /*
- * If we found an exact match, all ok.
- */
- if (rc == 1)
- break;
- rc = fb_find_mode(&init_var, &fb_info, NULL, NULL, 0,
- &acornfb_default_mode, DEFAULT_BPP);
- /*
- * If we found an exact match, all ok.
- */
- if (rc == 1)
- break;
- rc = fb_find_mode(&init_var, &fb_info, NULL, modedb,
- sizeof(modedb) / sizeof(*modedb),
- &acornfb_default_mode, DEFAULT_BPP);
- if (rc)
- break;
- rc = fb_find_mode(&init_var, &fb_info, NULL, NULL, 0,
- &acornfb_default_mode, DEFAULT_BPP);
- } while (0);
- /*
- * If we didn't find an exact match, try the
- * generic database.
- */
- if (rc == 0) {
- printk("Acornfb: no valid mode foundn");
- return -EINVAL;
- }
- h_sync = 1953125000 / init_var.pixclock;
- h_sync = h_sync * 512 / (init_var.xres + init_var.left_margin +
- init_var.right_margin + init_var.hsync_len);
- v_sync = h_sync / (init_var.yres + init_var.upper_margin +
- init_var.lower_margin + init_var.vsync_len);
- printk(KERN_INFO "Acornfb: %ldkB %cRAM, %s, using %dx%d, "
- "%d.%03dkHz, %dHzn",
- current_par.screen_size / 1024,
- current_par.using_vram ? 'V' : 'D',
- VIDC_NAME, init_var.xres, init_var.yres,
- h_sync / 1000, h_sync % 1000, v_sync);
- printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%sn",
- fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
- fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
- fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
- fb_info.monspecs.dpms ? ", DPMS" : "");
- if (acornfb_set_var(&init_var, -1, &fb_info))
- printk(KERN_ERR "Acornfb: unable to set display parametersn");
- if (register_framebuffer(&fb_info) < 0)
- return -EINVAL;
- return 0;
- }
- MODULE_AUTHOR("Russell King");
- MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;