--- /dev/null
+/*
+ * drivers/video/geode/gx1fb_core.c
+ * -- Geode GX1 framebuffer driver
+ *
+ * Copyright (C) 2005 Arcom Control Systems Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include "geodefb.h"
+#include "display_gx1.h"
+#include "video_cs5530.h"
+
+static char mode_option[32] = "640x480-16@60";
+static int crt_option = 1;
+static char panel_option[32] = "";
+
+static int gx1_line_delta(int xres, int bpp)
+{
+ int line_delta = xres * (bpp >> 3);
+
+ if (line_delta > 2048)
+ line_delta = 4096;
+ else if (line_delta > 1024)
+ line_delta = 2048;
+ else
+ line_delta = 1024;
+ return line_delta;
+}
+
+static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+
+ printk(KERN_DEBUG "%s()\n", __FUNCTION__);
+
+ /* Maximum resolution is 1280x1024. */
+ if (var->xres > 1280 || var->yres > 1024)
+ return -EINVAL;
+
+ if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
+ return -EINVAL;
+
+ /* Only 16 bpp and 8 bpp is supported by the hardware. */
+ if (var->bits_per_pixel == 16) {
+ var->red.offset = 11; var->red.length = 5;
+ var->green.offset = 5; var->green.length = 6;
+ var->blue.offset = 0; var->blue.length = 5;
+ var->transp.offset = 0; var->transp.length = 0;
+ } else if (var->bits_per_pixel == 8) {
+ var->red.offset = 0; var->red.length = 8;
+ var->green.offset = 0; var->green.length = 8;
+ var->blue.offset = 0; var->blue.length = 8;
+ var->transp.offset = 0; var->transp.length = 0;
+ } else
+ return -EINVAL;
+
+ /* Enough video memory? */
+ if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
+ return -EINVAL;
+
+ /* FIXME: Check timing parameters here? */
+
+ return 0;
+}
+
+static int gx1fb_set_par(struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+
+ if (info->var.bits_per_pixel == 16) {
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ fb_dealloc_cmap(&info->cmap);
+ } else {
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
+ }
+
+ info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);
+
+ par->dc_ops->set_mode(info);
+
+ return 0;
+}
+
+static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+
+ if (info->var.grayscale) {
+ /* grayscale = 0.30*R + 0.59*G + 0.11*B */
+ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+ }
+
+ /* Truecolor has hardware independent palette */
+ if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
+ u32 *pal = info->pseudo_palette;
+ u32 v;
+
+ if (regno >= 16)
+ return -EINVAL;
+
+ v = chan_to_field(red, &info->var.red);
+ v |= chan_to_field(green, &info->var.green);
+ v |= chan_to_field(blue, &info->var.blue);
+
+ pal[regno] = v;
+ } else {
+ if (regno >= 256)
+ return -EINVAL;
+
+ par->dc_ops->set_palette_reg(info, regno, red, green, blue);
+ }
+
+ return 0;
+}
+
+static int gx1fb_blank(int blank_mode, struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+
+ return par->vid_ops->blank_display(info, blank_mode);
+}
+
+static int __init gx1fb_map_video_memory(struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+ unsigned gx_base;
+ int fb_len;
+
+ gx_base = gx1_gx_base();
+ if (!gx_base)
+ return -ENODEV;
+
+ par->vid_dev = pci_get_device(PCI_VENDOR_ID_CYRIX,
+ PCI_DEVICE_ID_CYRIX_5530_VIDEO, NULL);
+ if (!par->vid_dev)
+ return -ENODEV;
+
+ par->vid_regs = ioremap(pci_resource_start(par->vid_dev, 1),
+ pci_resource_len(par->vid_dev, 1));
+ if (!par->vid_regs)
+ return -ENOMEM;
+
+ par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
+ if (!par->dc_regs)
+ return -ENOMEM;
+
+ info->fix.smem_start = gx_base + 0x800000;
+ if ((fb_len = gx1_frame_buffer_size()) < 0)
+ return -ENOMEM;
+ info->fix.smem_len = fb_len;
+ info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
+ if (!info->screen_base)
+ return -ENOMEM;
+
+ printk(KERN_INFO "%s: %d Kibyte of video memory at 0x%lx\n",
+ info->fix.id, info->fix.smem_len / 1024, info->fix.smem_start);
+
+ return 0;
+}
+
+static int parse_panel_option(struct fb_info *info)
+{
+ struct geodefb_par *par = info->par;
+
+ if (strcmp(panel_option, "") != 0) {
+ int x, y;
+ char *s;
+ x = simple_strtol(panel_option, &s, 10);
+ if (!x)
+ return -EINVAL;
+ y = simple_strtol(s + 1, NULL, 10);
+ if (!y)
+ return -EINVAL;
+ par->panel_x = x;
+ par->panel_y = y;
+ }
+ return 0;
+}
+
+static struct fb_ops gx1fb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = gx1fb_check_var,
+ .fb_set_par = gx1fb_set_par,
+ .fb_setcolreg = gx1fb_setcolreg,
+ .fb_blank = gx1fb_blank,
+ /* No HW acceleration for now. */
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_cursor = soft_cursor,
+};
+
+static struct fb_info * __init gx1fb_init_fbinfo(void)
+{
+ struct fb_info *info;
+ struct geodefb_par *par;
+
+ /* Alloc enough space for the pseudo palette. */
+ info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, NULL);
+ if (!info)
+ return NULL;
+
+ par = info->par;
+
+ strcpy(info->fix.id, "GX1");
+
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.type_aux = 0;
+ info->fix.xpanstep = 0;
+ info->fix.ypanstep = 0;
+ info->fix.ywrapstep = 0;
+ info->fix.accel = FB_ACCEL_NONE;
+
+ info->var.nonstd = 0;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->var.height = -1;
+ info->var.width = -1;
+ info->var.accel_flags = 0;
+ info->var.vmode = FB_VMODE_NONINTERLACED;
+
+ info->fbops = &gx1fb_ops;
+ info->flags = FBINFO_DEFAULT;
+ info->node = -1;
+
+ info->pseudo_palette = (void *)par + sizeof(struct geodefb_par);
+
+ info->var.grayscale = 0;
+
+ /* CRT and panel options */
+ par->enable_crt = crt_option;
+ if (parse_panel_option(info) < 0)
+ printk(KERN_WARNING "%s: invalid 'panel' option -- disabling flat panel\n",
+ info->fix.id);
+ if (!par->panel_x)
+ par->enable_crt = 1; /* fall back to CRT if no panel is specified */
+
+ return info;
+}
+
+
+static struct fb_info *gx1fb_info;
+
+static int __init gx1fb_init(void)
+{
+ struct fb_info *info;
+ struct geodefb_par *par;
+ int ret;
+
+#ifndef MODULE
+ if (fb_get_options("gx1fb", NULL))
+ return -ENODEV;
+#endif
+
+ info = gx1fb_init_fbinfo();
+ if (!info)
+ return -ENOMEM;
+ gx1fb_info = info;
+
+ par = info->par;
+
+ /* GX1 display controller and CS5530 video device */
+ par->dc_ops = &gx1_dc_ops;
+ par->vid_ops = &cs5530_vid_ops;
+
+ if ((ret = gx1fb_map_video_memory(info)) < 0) {
+ printk(KERN_ERR "%s: gx1fb_map_video_memory() failed\n", info->fix.id);
+ goto err;
+ }
+
+ ret = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 16);
+ if (ret == 0 || ret == 4) {
+ printk(KERN_ERR "%s: could not find valid video mode\n", info->fix.id);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* Clear the frame buffer of garbage. */
+ memset_io(info->screen_base, 0, info->fix.smem_len);
+
+ gx1fb_check_var(&info->var, info);
+ gx1fb_set_par(info);
+
+ if (register_framebuffer(info) < 0) {
+ ret = -EINVAL;
+ goto err;
+ }
+ printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
+ return 0;
+
+ err:
+ if (info->screen_base)
+ iounmap(info->screen_base);
+ if (par->vid_regs)
+ iounmap(par->vid_regs);
+ if (par->dc_regs)
+ iounmap(par->dc_regs);
+ if (par->vid_dev)
+ pci_dev_put(par->vid_dev);
+ if (info)
+ framebuffer_release(info);
+ return ret;
+}
+
+static void __exit gx1fb_cleanup(void)
+{
+ struct fb_info *info = gx1fb_info;
+ struct geodefb_par *par = gx1fb_info->par;
+
+ unregister_framebuffer(info);
+
+ iounmap((void __iomem *)info->screen_base);
+ iounmap(par->vid_regs);
+ iounmap(par->dc_regs);
+
+ pci_dev_put(par->vid_dev);
+
+ framebuffer_release(info);
+}
+
+module_init(gx1fb_init);
+module_exit(gx1fb_cleanup);
+
+module_param_string(mode, mode_option, sizeof(mode_option), 0444);
+MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
+
+module_param_named(crt, crt_option, int, 0444);
+MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");
+
+module_param_string(panel, panel_option, sizeof(panel_option), 0444);
+MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");
+
+MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff