--- /dev/null
+/*
+ * 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/mm.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/gfp.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+#include <asm/pgtable.h>
+
+#include "acornfb.h"
+
+/*
+ * 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] = {
+ { /* 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_VIDC20
+#include <mach/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;
+
+#if 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;
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ 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 += info->var.yres;
+
+ if (y_bottom > info->var.yres_virtual)
+ return -EINVAL;
+
+ acornfb_update_dma(info, var);
+
+ 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,
+};
+
+/*
+ * Everything after here is initialisation!!!
+ */
+static struct fb_videomode modedb[] = {
+ { /* 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 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 acornfb_init_fbinfo(void)
+{
+ static int first = 1;
+
+ if (!first)
+ return;
+ first = 0;
+
+ fb_info.fbops = &acornfb_ops;
+ fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+ fb_info.pseudo_palette = current_par.pseudo_palette;
+
+ strcpy(fb_info.fix.id, "Acorn");
+ fb_info.fix.type = FB_TYPE_PACKED_PIXELS;
+ fb_info.fix.type_aux = 0;
+ fb_info.fix.xpanstep = 0;
+ fb_info.fix.ypanstep = 1;
+ fb_info.fix.ywrapstep = 1;
+ fb_info.fix.line_length = 0;
+ fb_info.fix.accel = FB_ACCEL_NONE;
+
+ /*
+ * setup initial parameters
+ */
+ memset(&fb_info.var, 0, sizeof(fb_info.var));
+
+#if defined(HAS_VIDC20)
+ fb_info.var.red.length = 8;
+ fb_info.var.transp.length = 4;
+#endif
+ fb_info.var.green = fb_info.var.red;
+ fb_info.var.blue = fb_info.var.red;
+ fb_info.var.nonstd = 0;
+ fb_info.var.activate = FB_ACTIVATE_NOW;
+ fb_info.var.height = -1;
+ fb_info.var.width = -1;
+ fb_info.var.vmode = FB_VMODE_NONINTERLACED;
+ fb_info.var.accel_flags = FB_ACCELF_TEXT;
+
+ current_par.dram_size = 0;
+ current_par.montype = -1;
+ current_par.dpms = 0;
+}
+
+/*
+ * setup acornfb options:
+ *
+ * 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 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;
+
+ fb_info.var.width = simple_strtoul(p + 1, &p, 0);
+
+ if (*p != ':')
+ goto check_values;
+
+ fb_info.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: %s\n", opt);
+ current_par.montype = -1;
+}
+
+static void 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: %s\n",
+ 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: %s\n",
+ opt);
+ }
+}
+
+static void 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[] = {
+ { "mon", acornfb_parse_mon },
+ { "montype", acornfb_parse_montype },
+ { "dram", acornfb_parse_dram },
+ { NULL, NULL }
+};
+
+static int 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: %s\n",
+ opt);
+ }
+ return 0;
+}
+
+/*
+ * Detect type of monitor connected
+ * For now, we just assume SVGA
+ */
+static int acornfb_detect_monitortype(void)
+{
+ return 4;
+}
+
+/*
+ * This enables the unused memory to be freed on older Acorn machines.
+ * We are freeing memory on behalf of the architecture initialisation
+ * code here.
+ */
+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);
+ __free_reserved_page(page);
+
+ virtual_start += PAGE_SIZE;
+ mb_freed += PAGE_SIZE / 1024;
+ }
+
+ printk("acornfb: freed %dK memory\n", mb_freed);
+}
+
+static int acornfb_probe(struct platform_device *dev)
+{
+ unsigned long size;
+ u_int h_sync, v_sync;
+ int rc, i;
+ char *option = NULL;
+
+ if (fb_get_options("acornfb", &option))
+ return -ENODEV;
+ acornfb_setup(option);
+
+ acornfb_init_fbinfo();
+
+ current_par.dev = &dev->dev;
+
+ 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 < ARRAY_SIZE(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;
+ }
+ }
+
+ fb_info.screen_base = (char *)SCREEN_BASE;
+ fb_info.fix.smem_start = 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) {
+ dma_addr_t handle;
+ void *base;
+
+ /*
+ * RiscPC needs to allocate the DRAM memory
+ * for the framebuffer if we are not using
+ * VRAM.
+ */
+ base = dma_alloc_writecombine(current_par.dev, size, &handle,
+ GFP_KERNEL);
+ if (base == NULL) {
+ printk(KERN_ERR "acornfb: unable to allocate screen "
+ "memory\n");
+ return -ENOMEM;
+ }
+
+ fb_info.screen_base = base;
+ fb_info.fix.smem_start = handle;
+ }
+#endif
+ fb_info.fix.smem_len = 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(&fb_info.var, &fb_info, NULL, modedb,
+ ARRAY_SIZE(modedb),
+ &acornfb_default_mode, DEFAULT_BPP);
+ /*
+ * If we found an exact match, all ok.
+ */
+ if (rc == 1)
+ break;
+
+ rc = fb_find_mode(&fb_info.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(&fb_info.var, &fb_info, NULL, modedb,
+ ARRAY_SIZE(modedb),
+ &acornfb_default_mode, DEFAULT_BPP);
+ if (rc)
+ break;
+
+ rc = fb_find_mode(&fb_info.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 found\n");
+ return -EINVAL;
+ }
+
+ h_sync = 1953125000 / fb_info.var.pixclock;
+ h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
+ fb_info.var.right_margin + fb_info.var.hsync_len);
+ v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
+ fb_info.var.lower_margin + fb_info.var.vsync_len);
+
+ printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, "
+ "%d.%03dkHz, %dHz\n",
+ fb_info.fix.smem_len / 1024,
+ current_par.using_vram ? 'V' : 'D',
+ VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
+ h_sync / 1000, h_sync % 1000, v_sync);
+
+ printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
+ 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 (fb_set_var(&fb_info, &fb_info.var))
+ printk(KERN_ERR "Acornfb: unable to set display parameters\n");
+
+ if (register_framebuffer(&fb_info) < 0)
+ return -EINVAL;
+ return 0;
+}
+
+static struct platform_driver acornfb_driver = {
+ .probe = acornfb_probe,
+ .driver = {
+ .name = "acornfb",
+ },
+};
+
+static int __init acornfb_init(void)
+{
+ return platform_driver_register(&acornfb_driver);
+}
+
+module_init(acornfb_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff