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>
33 #include <asm/geode.h>
37 static char *mode_option;
40 /* Modes relevant to the GX (taken from modedb.c) */
41 static const struct fb_videomode gx_modedb[] __initdata = {
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 if (info->var.bits_per_pixel > 8) {
143 info->fix.visual = FB_VISUAL_TRUECOLOR;
144 fb_dealloc_cmap(&info->cmap);
146 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
147 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
150 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
157 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
160 chan >>= 16 - bf->length;
161 return chan << bf->offset;
164 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
165 unsigned blue, unsigned transp,
166 struct fb_info *info)
168 if (info->var.grayscale) {
169 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
170 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
173 /* Truecolor has hardware independent palette */
174 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
175 u32 *pal = info->pseudo_palette;
181 v = chan_to_field(red, &info->var.red);
182 v |= chan_to_field(green, &info->var.green);
183 v |= chan_to_field(blue, &info->var.blue);
190 gx_set_hw_palette_reg(info, regno, red, green, blue);
196 static int gxfb_blank(int blank_mode, struct fb_info *info)
198 return gx_blank_display(info, blank_mode);
201 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
203 struct gxfb_par *par = info->par;
206 ret = pci_enable_device(dev);
210 ret = pci_request_region(dev, 3, "gxfb (video processor)");
213 par->vid_regs = ioremap(pci_resource_start(dev, 3),
214 pci_resource_len(dev, 3));
218 ret = pci_request_region(dev, 2, "gxfb (display controller)");
221 par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
225 ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
229 info->fix.smem_start = pci_resource_start(dev, 0);
230 info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
231 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
232 if (!info->screen_base)
235 /* Set the 16MiB aligned base address of the graphics memory region
236 * in the display controller */
238 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
240 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
241 info->fix.smem_len / 1024, info->fix.smem_start);
246 static struct fb_ops gxfb_ops = {
247 .owner = THIS_MODULE,
248 .fb_check_var = gxfb_check_var,
249 .fb_set_par = gxfb_set_par,
250 .fb_setcolreg = gxfb_setcolreg,
251 .fb_blank = gxfb_blank,
252 /* No HW acceleration for now. */
253 .fb_fillrect = cfb_fillrect,
254 .fb_copyarea = cfb_copyarea,
255 .fb_imageblit = cfb_imageblit,
258 static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
260 struct gxfb_par *par;
261 struct fb_info *info;
263 /* Alloc enough space for the pseudo palette. */
264 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
271 strcpy(info->fix.id, "Geode GX");
273 info->fix.type = FB_TYPE_PACKED_PIXELS;
274 info->fix.type_aux = 0;
275 info->fix.xpanstep = 0;
276 info->fix.ypanstep = 0;
277 info->fix.ywrapstep = 0;
278 info->fix.accel = FB_ACCEL_NONE;
280 info->var.nonstd = 0;
281 info->var.activate = FB_ACTIVATE_NOW;
282 info->var.height = -1;
283 info->var.width = -1;
284 info->var.accel_flags = 0;
285 info->var.vmode = FB_VMODE_NONINTERLACED;
287 info->fbops = &gxfb_ops;
288 info->flags = FBINFO_DEFAULT;
291 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par);
293 info->var.grayscale = 0;
298 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
300 struct gxfb_par *par;
301 struct fb_info *info;
305 info = gxfb_init_fbinfo(&pdev->dev);
310 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
311 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
315 /* Figure out if this is a TFT or CRT part */
317 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
319 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
324 ret = fb_find_mode(&info->var, info, mode_option,
325 gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
326 if (ret == 0 || ret == 4) {
327 dev_err(&pdev->dev, "could not find valid video mode\n");
333 /* Clear the frame buffer of garbage. */
334 memset_io(info->screen_base, 0, info->fix.smem_len);
336 gxfb_check_var(&info->var, info);
339 if (register_framebuffer(info) < 0) {
343 pci_set_drvdata(pdev, info);
344 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
348 if (info->screen_base) {
349 iounmap(info->screen_base);
350 pci_release_region(pdev, 0);
353 iounmap(par->vid_regs);
354 pci_release_region(pdev, 3);
357 iounmap(par->dc_regs);
358 pci_release_region(pdev, 2);
362 framebuffer_release(info);
366 static void gxfb_remove(struct pci_dev *pdev)
368 struct fb_info *info = pci_get_drvdata(pdev);
369 struct gxfb_par *par = info->par;
371 unregister_framebuffer(info);
373 iounmap((void __iomem *)info->screen_base);
374 pci_release_region(pdev, 0);
376 iounmap(par->vid_regs);
377 pci_release_region(pdev, 3);
379 iounmap(par->dc_regs);
380 pci_release_region(pdev, 2);
382 pci_set_drvdata(pdev, NULL);
384 framebuffer_release(info);
387 static struct pci_device_id gxfb_id_table[] = {
388 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
392 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
394 static struct pci_driver gxfb_driver = {
396 .id_table = gxfb_id_table,
398 .remove = gxfb_remove,
402 static int __init gxfb_setup(char *options)
407 if (!options || !*options)
410 while ((opt = strsep(&options, ",")) != NULL) {
421 static int __init gxfb_init(void)
426 if (fb_get_options("gxfb", &option))
431 return pci_register_driver(&gxfb_driver);
434 static void __exit gxfb_cleanup(void)
436 pci_unregister_driver(&gxfb_driver);
439 module_init(gxfb_init);
440 module_exit(gxfb_cleanup);
442 module_param(mode_option, charp, 0);
443 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
445 module_param(vram, int, 0);
446 MODULE_PARM_DESC(vram, "video memory size");
448 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
449 MODULE_LICENSE("GPL");