2 * Geode GX framebuffer driver.
4 * Copyright (C) 2006 Arcom Control Systems Ltd.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
12 * This driver assumes that the BIOS has created a virtual PCI device header
13 * for the video device. The PCI header is assumed to contain the following
16 * BAR0 - framebuffer memory
17 * BAR1 - graphics processor registers
18 * BAR2 - display controller registers
19 * BAR3 - video processor and flat panel control registers.
21 * 16 MiB of framebuffer memory is assumed to be available.
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/string.h>
28 #include <linux/slab.h>
29 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/pci.h>
35 #include "display_gx.h"
38 static char mode_option[32] = "640x480-16@60";
40 /* Modes relevant to the GX (taken from modedb.c) */
41 static const struct fb_videomode __initdata gx_modedb[] = {
43 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
44 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
46 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
47 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
49 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
50 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
52 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
53 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
54 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
56 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
57 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
58 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
60 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
61 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
62 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
63 /* 1024x768-60 VESA */
64 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
65 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
66 /* 1024x768-75 VESA */
67 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
68 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
69 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
70 /* 1024x768-85 VESA */
71 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
72 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
73 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
74 /* 1280x960-60 VESA */
75 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
76 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
77 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
78 /* 1280x960-85 VESA */
79 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
80 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
81 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
82 /* 1280x1024-60 VESA */
83 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
84 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
85 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
86 /* 1280x1024-75 VESA */
87 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
88 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
89 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
90 /* 1280x1024-85 VESA */
91 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
92 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
93 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
94 /* 1600x1200-60 VESA */
95 { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
96 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
97 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
98 /* 1600x1200-75 VESA */
99 { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
100 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
101 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
102 /* 1600x1200-85 VESA */
103 { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
104 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
105 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
108 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
110 if (var->xres > 1600 || var->yres > 1200)
112 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
115 if (var->bits_per_pixel == 32) {
116 var->red.offset = 16; var->red.length = 8;
117 var->green.offset = 8; var->green.length = 8;
118 var->blue.offset = 0; var->blue.length = 8;
119 } else if (var->bits_per_pixel == 16) {
120 var->red.offset = 11; var->red.length = 5;
121 var->green.offset = 5; var->green.length = 6;
122 var->blue.offset = 0; var->blue.length = 5;
123 } else if (var->bits_per_pixel == 8) {
124 var->red.offset = 0; var->red.length = 8;
125 var->green.offset = 0; var->green.length = 8;
126 var->blue.offset = 0; var->blue.length = 8;
129 var->transp.offset = 0; var->transp.length = 0;
131 /* Enough video memory? */
132 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
135 /* FIXME: Check timing parameters here? */
140 static int gxfb_set_par(struct fb_info *info)
142 struct geodefb_par *par = info->par;
144 if (info->var.bits_per_pixel > 8) {
145 info->fix.visual = FB_VISUAL_TRUECOLOR;
146 fb_dealloc_cmap(&info->cmap);
148 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
149 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
152 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
154 par->dc_ops->set_mode(info);
159 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
162 chan >>= 16 - bf->length;
163 return chan << bf->offset;
166 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
167 unsigned blue, unsigned transp,
168 struct fb_info *info)
170 struct geodefb_par *par = info->par;
172 if (info->var.grayscale) {
173 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
174 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
177 /* Truecolor has hardware independent palette */
178 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
179 u32 *pal = info->pseudo_palette;
185 v = chan_to_field(red, &info->var.red);
186 v |= chan_to_field(green, &info->var.green);
187 v |= chan_to_field(blue, &info->var.blue);
194 par->dc_ops->set_palette_reg(info, regno, red, green, blue);
200 static int gxfb_blank(int blank_mode, struct fb_info *info)
202 struct geodefb_par *par = info->par;
204 return par->vid_ops->blank_display(info, blank_mode);
207 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
209 struct geodefb_par *par = info->par;
213 ret = pci_enable_device(dev);
217 ret = pci_request_region(dev, 3, "gxfb (video processor)");
220 par->vid_regs = ioremap(pci_resource_start(dev, 3),
221 pci_resource_len(dev, 3));
225 ret = pci_request_region(dev, 2, "gxfb (display controller)");
228 par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
232 ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
235 if ((fb_len = gx_frame_buffer_size()) < 0)
237 info->fix.smem_start = pci_resource_start(dev, 0);
238 info->fix.smem_len = fb_len;
239 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
240 if (!info->screen_base)
243 dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
244 info->fix.smem_len / 1024, info->fix.smem_start);
249 static struct fb_ops gxfb_ops = {
250 .owner = THIS_MODULE,
251 .fb_check_var = gxfb_check_var,
252 .fb_set_par = gxfb_set_par,
253 .fb_setcolreg = gxfb_setcolreg,
254 .fb_blank = gxfb_blank,
255 /* No HW acceleration for now. */
256 .fb_fillrect = cfb_fillrect,
257 .fb_copyarea = cfb_copyarea,
258 .fb_imageblit = cfb_imageblit,
261 static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
263 struct geodefb_par *par;
264 struct fb_info *info;
266 /* Alloc enough space for the pseudo palette. */
267 info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
273 strcpy(info->fix.id, "Geode GX");
275 info->fix.type = FB_TYPE_PACKED_PIXELS;
276 info->fix.type_aux = 0;
277 info->fix.xpanstep = 0;
278 info->fix.ypanstep = 0;
279 info->fix.ywrapstep = 0;
280 info->fix.accel = FB_ACCEL_NONE;
282 info->var.nonstd = 0;
283 info->var.activate = FB_ACTIVATE_NOW;
284 info->var.height = -1;
285 info->var.width = -1;
286 info->var.accel_flags = 0;
287 info->var.vmode = FB_VMODE_NONINTERLACED;
289 info->fbops = &gxfb_ops;
290 info->flags = FBINFO_DEFAULT;
293 info->pseudo_palette = (void *)par + sizeof(struct geodefb_par);
295 info->var.grayscale = 0;
300 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
302 struct geodefb_par *par;
303 struct fb_info *info;
306 info = gxfb_init_fbinfo(&pdev->dev);
311 /* GX display controller and GX video device. */
312 par->dc_ops = &gx_dc_ops;
313 par->vid_ops = &gx_vid_ops;
315 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
316 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
320 ret = fb_find_mode(&info->var, info, mode_option,
321 gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
322 if (ret == 0 || ret == 4) {
323 dev_err(&pdev->dev, "could not find valid video mode\n");
328 /* Clear the frame buffer of garbage. */
329 memset_io(info->screen_base, 0, info->fix.smem_len);
331 gxfb_check_var(&info->var, info);
334 if (register_framebuffer(info) < 0) {
338 pci_set_drvdata(pdev, info);
339 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
343 if (info->screen_base) {
344 iounmap(info->screen_base);
345 pci_release_region(pdev, 0);
348 iounmap(par->vid_regs);
349 pci_release_region(pdev, 3);
352 iounmap(par->dc_regs);
353 pci_release_region(pdev, 2);
357 framebuffer_release(info);
361 static void gxfb_remove(struct pci_dev *pdev)
363 struct fb_info *info = pci_get_drvdata(pdev);
364 struct geodefb_par *par = info->par;
366 unregister_framebuffer(info);
368 iounmap((void __iomem *)info->screen_base);
369 pci_release_region(pdev, 0);
371 iounmap(par->vid_regs);
372 pci_release_region(pdev, 3);
374 iounmap(par->dc_regs);
375 pci_release_region(pdev, 2);
377 pci_set_drvdata(pdev, NULL);
379 framebuffer_release(info);
382 static struct pci_device_id gxfb_id_table[] = {
383 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO,
384 PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
389 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
391 static struct pci_driver gxfb_driver = {
393 .id_table = gxfb_id_table,
395 .remove = gxfb_remove,
398 static int __init gxfb_init(void)
401 if (fb_get_options("gxfb", NULL))
404 return pci_register_driver(&gxfb_driver);
407 static void __exit gxfb_cleanup(void)
409 pci_unregister_driver(&gxfb_driver);
412 module_init(gxfb_init);
413 module_exit(gxfb_cleanup);
415 module_param_string(mode, mode_option, sizeof(mode_option), 0444);
416 MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");
418 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
419 MODULE_LICENSE("GPL");