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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Geode GX framebuffer driver.4 *5 * Copyright (C) 2006 Arcom Control Systems Ltd.6 *7 * This driver assumes that the BIOS has created a virtual PCI device header8 * for the video device. The PCI header is assumed to contain the following9 * BARs:10 *11 * BAR0 - framebuffer memory12 * BAR1 - graphics processor registers13 * BAR2 - display controller registers14 * BAR3 - video processor and flat panel control registers.15 *16 * 16 MiB of framebuffer memory is assumed to be available.17 */18#include <linux/aperture.h>19#include <linux/module.h>20#include <linux/kernel.h>21#include <linux/errno.h>22#include <linux/string.h>23#include <linux/mm.h>24#include <linux/delay.h>25#include <linux/fb.h>26#include <linux/console.h>27#include <linux/suspend.h>28#include <linux/init.h>29#include <linux/pci.h>30#include <linux/cs5535.h>31 32#include <asm/olpc.h>33 34#include "gxfb.h"35 36static char *mode_option;37static int vram;38static int vt_switch;39 40/* Modes relevant to the GX (taken from modedb.c) */41static struct fb_videomode gx_modedb[] = {42 /* 640x480-60 VESA */43 { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,44 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },45 /* 640x480-75 VESA */46 { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,47 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },48 /* 640x480-85 VESA */49 { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,50 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },51 /* 800x600-60 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 },55 /* 800x600-75 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 },59 /* 800x600-85 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 },106};107 108static struct fb_videomode gx_dcon_modedb[] = {109 /* The only mode the DCON has is 1200x900 */110 { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,111 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,112 FB_VMODE_NONINTERLACED, 0 }113};114 115static void get_modedb(struct fb_videomode **modedb, unsigned int *size)116{117 if (olpc_has_dcon()) {118 *modedb = (struct fb_videomode *) gx_dcon_modedb;119 *size = ARRAY_SIZE(gx_dcon_modedb);120 } else {121 *modedb = (struct fb_videomode *) gx_modedb;122 *size = ARRAY_SIZE(gx_modedb);123 }124}125 126static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)127{128 if (var->xres > 1600 || var->yres > 1200)129 return -EINVAL;130 if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)131 return -EINVAL;132 133 if (var->bits_per_pixel == 32) {134 var->red.offset = 16; var->red.length = 8;135 var->green.offset = 8; var->green.length = 8;136 var->blue.offset = 0; var->blue.length = 8;137 } else if (var->bits_per_pixel == 16) {138 var->red.offset = 11; var->red.length = 5;139 var->green.offset = 5; var->green.length = 6;140 var->blue.offset = 0; var->blue.length = 5;141 } else if (var->bits_per_pixel == 8) {142 var->red.offset = 0; var->red.length = 8;143 var->green.offset = 0; var->green.length = 8;144 var->blue.offset = 0; var->blue.length = 8;145 } else146 return -EINVAL;147 var->transp.offset = 0; var->transp.length = 0;148 149 /* Enough video memory? */150 if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)151 return -EINVAL;152 153 /* FIXME: Check timing parameters here? */154 155 return 0;156}157 158static int gxfb_set_par(struct fb_info *info)159{160 if (info->var.bits_per_pixel > 8)161 info->fix.visual = FB_VISUAL_TRUECOLOR;162 else163 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;164 165 info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);166 167 gx_set_mode(info);168 169 return 0;170}171 172static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)173{174 chan &= 0xffff;175 chan >>= 16 - bf->length;176 return chan << bf->offset;177}178 179static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,180 unsigned blue, unsigned transp,181 struct fb_info *info)182{183 if (info->var.grayscale) {184 /* grayscale = 0.30*R + 0.59*G + 0.11*B */185 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;186 }187 188 /* Truecolor has hardware independent palette */189 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {190 u32 *pal = info->pseudo_palette;191 u32 v;192 193 if (regno >= 16)194 return -EINVAL;195 196 v = chan_to_field(red, &info->var.red);197 v |= chan_to_field(green, &info->var.green);198 v |= chan_to_field(blue, &info->var.blue);199 200 pal[regno] = v;201 } else {202 if (regno >= 256)203 return -EINVAL;204 205 gx_set_hw_palette_reg(info, regno, red, green, blue);206 }207 208 return 0;209}210 211static int gxfb_blank(int blank_mode, struct fb_info *info)212{213 return gx_blank_display(info, blank_mode);214}215 216static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)217{218 struct gxfb_par *par = info->par;219 int ret;220 221 ret = pci_enable_device(dev);222 if (ret < 0)223 return ret;224 225 ret = pci_request_region(dev, 3, "gxfb (video processor)");226 if (ret < 0)227 return ret;228 par->vid_regs = pci_ioremap_bar(dev, 3);229 if (!par->vid_regs)230 return -ENOMEM;231 232 ret = pci_request_region(dev, 2, "gxfb (display controller)");233 if (ret < 0)234 return ret;235 par->dc_regs = pci_ioremap_bar(dev, 2);236 if (!par->dc_regs)237 return -ENOMEM;238 239 ret = pci_request_region(dev, 1, "gxfb (graphics processor)");240 if (ret < 0)241 return ret;242 par->gp_regs = pci_ioremap_bar(dev, 1);243 244 if (!par->gp_regs)245 return -ENOMEM;246 247 ret = pci_request_region(dev, 0, "gxfb (framebuffer)");248 if (ret < 0)249 return ret;250 251 info->fix.smem_start = pci_resource_start(dev, 0);252 info->fix.smem_len = vram ? vram : gx_frame_buffer_size();253 info->screen_base = ioremap_wc(info->fix.smem_start,254 info->fix.smem_len);255 if (!info->screen_base)256 return -ENOMEM;257 258 /* Set the 16MiB aligned base address of the graphics memory region259 * in the display controller */260 261 write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);262 263 dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",264 info->fix.smem_len / 1024, info->fix.smem_start);265 266 return 0;267}268 269static const struct fb_ops gxfb_ops = {270 .owner = THIS_MODULE,271 FB_DEFAULT_IOMEM_OPS,272 .fb_check_var = gxfb_check_var,273 .fb_set_par = gxfb_set_par,274 .fb_setcolreg = gxfb_setcolreg,275 .fb_blank = gxfb_blank,276};277 278static struct fb_info *gxfb_init_fbinfo(struct device *dev)279{280 struct gxfb_par *par;281 struct fb_info *info;282 283 /* Alloc enough space for the pseudo palette. */284 info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,285 dev);286 if (!info)287 return NULL;288 289 par = info->par;290 291 strcpy(info->fix.id, "Geode GX");292 293 info->fix.type = FB_TYPE_PACKED_PIXELS;294 info->fix.type_aux = 0;295 info->fix.xpanstep = 0;296 info->fix.ypanstep = 0;297 info->fix.ywrapstep = 0;298 info->fix.accel = FB_ACCEL_NONE;299 300 info->var.nonstd = 0;301 info->var.activate = FB_ACTIVATE_NOW;302 info->var.height = -1;303 info->var.width = -1;304 info->var.accel_flags = 0;305 info->var.vmode = FB_VMODE_NONINTERLACED;306 307 info->fbops = &gxfb_ops;308 info->node = -1;309 310 info->pseudo_palette = (void *)par + sizeof(struct gxfb_par);311 312 info->var.grayscale = 0;313 314 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {315 framebuffer_release(info);316 return NULL;317 }318 319 return info;320}321 322static int __maybe_unused gxfb_suspend(struct device *dev)323{324 struct fb_info *info = dev_get_drvdata(dev);325 326 console_lock();327 gx_powerdown(info);328 fb_set_suspend(info, 1);329 console_unlock();330 331 /* there's no point in setting PCI states; we emulate PCI, so332 * we don't end up getting power savings anyways */333 334 return 0;335}336 337static int __maybe_unused gxfb_resume(struct device *dev)338{339 struct fb_info *info = dev_get_drvdata(dev);340 int ret;341 342 console_lock();343 ret = gx_powerup(info);344 if (ret) {345 printk(KERN_ERR "gxfb: power up failed!\n");346 return ret;347 }348 349 fb_set_suspend(info, 0);350 console_unlock();351 return 0;352}353 354static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)355{356 struct gxfb_par *par;357 struct fb_info *info;358 int ret;359 unsigned long val;360 361 struct fb_videomode *modedb_ptr;362 unsigned int modedb_size;363 364 ret = aperture_remove_conflicting_pci_devices(pdev, "gxfb");365 if (ret)366 return ret;367 368 info = gxfb_init_fbinfo(&pdev->dev);369 if (!info)370 return -ENOMEM;371 par = info->par;372 373 if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {374 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");375 goto err;376 }377 378 /* Figure out if this is a TFT or CRT part */379 380 rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);381 382 if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)383 par->enable_crt = 0;384 else385 par->enable_crt = 1;386 387 get_modedb(&modedb_ptr, &modedb_size);388 ret = fb_find_mode(&info->var, info, mode_option,389 modedb_ptr, modedb_size, NULL, 16);390 if (ret == 0 || ret == 4) {391 dev_err(&pdev->dev, "could not find valid video mode\n");392 ret = -EINVAL;393 goto err;394 }395 396 397 /* Clear the frame buffer of garbage. */398 memset_io(info->screen_base, 0, info->fix.smem_len);399 400 gxfb_check_var(&info->var, info);401 gxfb_set_par(info);402 403 pm_set_vt_switch(vt_switch);404 405 if (register_framebuffer(info) < 0) {406 ret = -EINVAL;407 goto err;408 }409 pci_set_drvdata(pdev, info);410 fb_info(info, "%s frame buffer device\n", info->fix.id);411 return 0;412 413 err:414 if (info->screen_base) {415 iounmap(info->screen_base);416 pci_release_region(pdev, 0);417 }418 if (par->vid_regs) {419 iounmap(par->vid_regs);420 pci_release_region(pdev, 3);421 }422 if (par->dc_regs) {423 iounmap(par->dc_regs);424 pci_release_region(pdev, 2);425 }426 if (par->gp_regs) {427 iounmap(par->gp_regs);428 pci_release_region(pdev, 1);429 }430 431 fb_dealloc_cmap(&info->cmap);432 framebuffer_release(info);433 return ret;434}435 436static void gxfb_remove(struct pci_dev *pdev)437{438 struct fb_info *info = pci_get_drvdata(pdev);439 struct gxfb_par *par = info->par;440 441 unregister_framebuffer(info);442 443 iounmap((void __iomem *)info->screen_base);444 pci_release_region(pdev, 0);445 446 iounmap(par->vid_regs);447 pci_release_region(pdev, 3);448 449 iounmap(par->dc_regs);450 pci_release_region(pdev, 2);451 452 iounmap(par->gp_regs);453 pci_release_region(pdev, 1);454 455 fb_dealloc_cmap(&info->cmap);456 457 framebuffer_release(info);458}459 460static const struct pci_device_id gxfb_id_table[] = {461 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },462 { 0, }463};464 465MODULE_DEVICE_TABLE(pci, gxfb_id_table);466 467static const struct dev_pm_ops gxfb_pm_ops = {468#ifdef CONFIG_PM_SLEEP469 .suspend = gxfb_suspend,470 .resume = gxfb_resume,471 .freeze = NULL,472 .thaw = gxfb_resume,473 .poweroff = NULL,474 .restore = gxfb_resume,475#endif476};477 478static struct pci_driver gxfb_driver = {479 .name = "gxfb",480 .id_table = gxfb_id_table,481 .probe = gxfb_probe,482 .remove = gxfb_remove,483 .driver.pm = &gxfb_pm_ops,484};485 486#ifndef MODULE487static int __init gxfb_setup(char *options)488{489 490 char *opt;491 492 if (!options || !*options)493 return 0;494 495 while ((opt = strsep(&options, ",")) != NULL) {496 if (!*opt)497 continue;498 499 mode_option = opt;500 }501 502 return 0;503}504#endif505 506static int __init gxfb_init(void)507{508#ifndef MODULE509 char *option = NULL;510#endif511 512 if (fb_modesetting_disabled("gxfb"))513 return -ENODEV;514 515#ifndef MODULE516 if (fb_get_options("gxfb", &option))517 return -ENODEV;518 519 gxfb_setup(option);520#endif521 return pci_register_driver(&gxfb_driver);522}523 524static void __exit gxfb_cleanup(void)525{526 pci_unregister_driver(&gxfb_driver);527}528 529module_init(gxfb_init);530module_exit(gxfb_cleanup);531 532module_param(mode_option, charp, 0);533MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");534 535module_param(vram, int, 0);536MODULE_PARM_DESC(vram, "video memory size");537 538module_param(vt_switch, int, 0);539MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");540 541MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");542MODULE_LICENSE("GPL");543