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/console.h>
32 #include <linux/init.h>
33 #include <linux/pci.h>
34 #include <asm/geode.h>
38 static char *mode_option;
41 /* Modes relevant to the GX (taken from modedb.c) */
42 static const struct fb_videomode gx_modedb[] __initdata = {
44 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
45 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
47 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
48 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
50 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
51 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
53 { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
54 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
55 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
57 { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
58 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
59 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
61 { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
62 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
63 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
64 /* 1024x768-60 VESA */
65 { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
66 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
67 /* 1024x768-75 VESA */
68 { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
69 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
70 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
71 /* 1024x768-85 VESA */
72 { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
73 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
74 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
75 /* 1280x960-60 VESA */
76 { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
77 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
78 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
79 /* 1280x960-85 VESA */
80 { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
81 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
82 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
83 /* 1280x1024-60 VESA */
84 { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
85 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
86 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
87 /* 1280x1024-75 VESA */
88 { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
89 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
90 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
91 /* 1280x1024-85 VESA */
92 { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
93 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
94 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
95 /* 1600x1200-60 VESA */
96 { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
97 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
98 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
99 /* 1600x1200-75 VESA */
100 { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
101 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
102 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
103 /* 1600x1200-85 VESA */
104 { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
105 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
106 FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
109 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
111 if (var->xres > 1600 || var->yres > 1200)
113 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
116 if (var->bits_per_pixel == 32) {
117 var->red.offset = 16; var->red.length = 8;
118 var->green.offset = 8; var->green.length = 8;
119 var->blue.offset = 0; var->blue.length = 8;
120 } else if (var->bits_per_pixel == 16) {
121 var->red.offset = 11; var->red.length = 5;
122 var->green.offset = 5; var->green.length = 6;
123 var->blue.offset = 0; var->blue.length = 5;
124 } else if (var->bits_per_pixel == 8) {
125 var->red.offset = 0; var->red.length = 8;
126 var->green.offset = 0; var->green.length = 8;
127 var->blue.offset = 0; var->blue.length = 8;
130 var->transp.offset = 0; var->transp.length = 0;
132 /* Enough video memory? */
133 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
136 /* FIXME: Check timing parameters here? */
141 static int gxfb_set_par(struct fb_info *info)
143 if (info->var.bits_per_pixel > 8) {
144 info->fix.visual = FB_VISUAL_TRUECOLOR;
145 fb_dealloc_cmap(&info->cmap);
147 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
148 fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
151 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
158 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
161 chan >>= 16 - bf->length;
162 return chan << bf->offset;
165 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
166 unsigned blue, unsigned transp,
167 struct fb_info *info)
169 if (info->var.grayscale) {
170 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
171 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
174 /* Truecolor has hardware independent palette */
175 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
176 u32 *pal = info->pseudo_palette;
182 v = chan_to_field(red, &info->var.red);
183 v |= chan_to_field(green, &info->var.green);
184 v |= chan_to_field(blue, &info->var.blue);
191 gx_set_hw_palette_reg(info, regno, red, green, blue);
197 static int gxfb_blank(int blank_mode, struct fb_info *info)
199 return gx_blank_display(info, blank_mode);
202 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
204 struct gxfb_par *par = info->par;
207 ret = pci_enable_device(dev);
211 ret = pci_request_region(dev, 3, "gxfb (video processor)");
214 par->vid_regs = ioremap(pci_resource_start(dev, 3),
215 pci_resource_len(dev, 3));
219 ret = pci_request_region(dev, 2, "gxfb (display controller)");
222 par->dc_regs = ioremap(pci_resource_start(dev, 2), pci_resource_len(dev, 2));
226 ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
229 par->gp_regs = ioremap(pci_resource_start(dev, 1),
230 pci_resource_len(dev, 1));
235 ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
239 info->fix.smem_start = pci_resource_start(dev, 0);
240 info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
241 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
242 if (!info->screen_base)
245 /* Set the 16MiB aligned base address of the graphics memory region
246 * in the display controller */
248 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
250 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
251 info->fix.smem_len / 1024, info->fix.smem_start);
256 static struct fb_ops gxfb_ops = {
257 .owner = THIS_MODULE,
258 .fb_check_var = gxfb_check_var,
259 .fb_set_par = gxfb_set_par,
260 .fb_setcolreg = gxfb_setcolreg,
261 .fb_blank = gxfb_blank,
262 /* No HW acceleration for now. */
263 .fb_fillrect = cfb_fillrect,
264 .fb_copyarea = cfb_copyarea,
265 .fb_imageblit = cfb_imageblit,
268 static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
270 struct gxfb_par *par;
271 struct fb_info *info;
273 /* Alloc enough space for the pseudo palette. */
274 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
281 strcpy(info->fix.id, "Geode GX");
283 info->fix.type = FB_TYPE_PACKED_PIXELS;
284 info->fix.type_aux = 0;
285 info->fix.xpanstep = 0;
286 info->fix.ypanstep = 0;
287 info->fix.ywrapstep = 0;
288 info->fix.accel = FB_ACCEL_NONE;
290 info->var.nonstd = 0;
291 info->var.activate = FB_ACTIVATE_NOW;
292 info->var.height = -1;
293 info->var.width = -1;
294 info->var.accel_flags = 0;
295 info->var.vmode = FB_VMODE_NONINTERLACED;
297 info->fbops = &gxfb_ops;
298 info->flags = FBINFO_DEFAULT;
301 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par);
303 info->var.grayscale = 0;
309 static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state)
311 struct fb_info *info = pci_get_drvdata(pdev);
313 if (state.event == PM_EVENT_SUSPEND) {
314 acquire_console_sem();
316 fb_set_suspend(info, 1);
317 release_console_sem();
320 /* there's no point in setting PCI states; we emulate PCI, so
321 * we don't end up getting power savings anyways */
326 static int gxfb_resume(struct pci_dev *pdev)
328 struct fb_info *info = pci_get_drvdata(pdev);
331 acquire_console_sem();
332 ret = gx_powerup(info);
334 printk(KERN_ERR "gxfb: power up failed!\n");
338 fb_set_suspend(info, 0);
339 release_console_sem();
344 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
346 struct gxfb_par *par;
347 struct fb_info *info;
351 info = gxfb_init_fbinfo(&pdev->dev);
356 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
357 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
361 /* Figure out if this is a TFT or CRT part */
363 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
365 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
370 ret = fb_find_mode(&info->var, info, mode_option,
371 gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
372 if (ret == 0 || ret == 4) {
373 dev_err(&pdev->dev, "could not find valid video mode\n");
379 /* Clear the frame buffer of garbage. */
380 memset_io(info->screen_base, 0, info->fix.smem_len);
382 gxfb_check_var(&info->var, info);
385 if (register_framebuffer(info) < 0) {
389 pci_set_drvdata(pdev, info);
390 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
394 if (info->screen_base) {
395 iounmap(info->screen_base);
396 pci_release_region(pdev, 0);
399 iounmap(par->vid_regs);
400 pci_release_region(pdev, 3);
403 iounmap(par->dc_regs);
404 pci_release_region(pdev, 2);
407 iounmap(par->gp_regs);
408 pci_release_region(pdev, 1);
412 framebuffer_release(info);
416 static void gxfb_remove(struct pci_dev *pdev)
418 struct fb_info *info = pci_get_drvdata(pdev);
419 struct gxfb_par *par = info->par;
421 unregister_framebuffer(info);
423 iounmap((void __iomem *)info->screen_base);
424 pci_release_region(pdev, 0);
426 iounmap(par->vid_regs);
427 pci_release_region(pdev, 3);
429 iounmap(par->dc_regs);
430 pci_release_region(pdev, 2);
432 iounmap(par->gp_regs);
433 pci_release_region(pdev, 1);
435 pci_set_drvdata(pdev, NULL);
437 framebuffer_release(info);
440 static struct pci_device_id gxfb_id_table[] = {
441 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
445 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
447 static struct pci_driver gxfb_driver = {
449 .id_table = gxfb_id_table,
451 .remove = gxfb_remove,
453 .suspend = gxfb_suspend,
454 .resume = gxfb_resume,
459 static int __init gxfb_setup(char *options)
464 if (!options || !*options)
467 while ((opt = strsep(&options, ",")) != NULL) {
478 static int __init gxfb_init(void)
483 if (fb_get_options("gxfb", &option))
488 return pci_register_driver(&gxfb_driver);
491 static void __exit gxfb_cleanup(void)
493 pci_unregister_driver(&gxfb_driver);
496 module_init(gxfb_init);
497 module_exit(gxfb_cleanup);
499 module_param(mode_option, charp, 0);
500 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
502 module_param(vram, int, 0);
503 MODULE_PARM_DESC(vram, "video memory size");
505 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
506 MODULE_LICENSE("GPL");