398 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* bw2.c: BWTWO frame buffer driver3 *4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)8 *9 * Driver layout based loosely on tgafb.c, see that file for credits.10 */11 12#include <linux/module.h>13#include <linux/kernel.h>14#include <linux/errno.h>15#include <linux/string.h>16#include <linux/delay.h>17#include <linux/init.h>18#include <linux/fb.h>19#include <linux/mm.h>20#include <linux/of.h>21#include <linux/platform_device.h>22 23#include <asm/io.h>24#include <asm/fbio.h>25 26#include "sbuslib.h"27 28/*29 * Local functions.30 */31 32static int bw2_blank(int, struct fb_info *);33 34static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);35static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);36 37/*38 * Frame buffer operations39 */40 41static const struct fb_ops bw2_ops = {42 .owner = THIS_MODULE,43 FB_DEFAULT_SBUS_OPS(bw2),44 .fb_blank = bw2_blank,45};46 47/* OBio addresses for the bwtwo registers */48#define BWTWO_REGISTER_OFFSET 0x40000049 50struct bt_regs {51 u32 addr;52 u32 color_map;53 u32 control;54 u32 cursor;55};56 57struct bw2_regs {58 struct bt_regs cmap;59 u8 control;60 u8 status;61 u8 cursor_start;62 u8 cursor_end;63 u8 h_blank_start;64 u8 h_blank_end;65 u8 h_sync_start;66 u8 h_sync_end;67 u8 comp_sync_end;68 u8 v_blank_start_high;69 u8 v_blank_start_low;70 u8 v_blank_end;71 u8 v_sync_start;72 u8 v_sync_end;73 u8 xfer_holdoff_start;74 u8 xfer_holdoff_end;75};76 77/* Status Register Constants */78#define BWTWO_SR_RES_MASK 0x7079#define BWTWO_SR_1600_1280 0x5080#define BWTWO_SR_1152_900_76_A 0x4081#define BWTWO_SR_1152_900_76_B 0x6082#define BWTWO_SR_ID_MASK 0x0f83#define BWTWO_SR_ID_MONO 0x0284#define BWTWO_SR_ID_MONO_ECL 0x0385#define BWTWO_SR_ID_MSYNC 0x0486#define BWTWO_SR_ID_NOCONN 0x0a87 88/* Control Register Constants */89#define BWTWO_CTL_ENABLE_INTS 0x8090#define BWTWO_CTL_ENABLE_VIDEO 0x4091#define BWTWO_CTL_ENABLE_TIMING 0x2092#define BWTWO_CTL_ENABLE_CURCMP 0x1093#define BWTWO_CTL_XTAL_MASK 0x0C94#define BWTWO_CTL_DIVISOR_MASK 0x0395 96/* Status Register Constants */97#define BWTWO_STAT_PENDING_INT 0x8098#define BWTWO_STAT_MSENSE_MASK 0x7099#define BWTWO_STAT_ID_MASK 0x0f100 101struct bw2_par {102 spinlock_t lock;103 struct bw2_regs __iomem *regs;104 105 u32 flags;106#define BW2_FLAG_BLANKED 0x00000001107 108 unsigned long which_io;109};110 111/**112 * bw2_blank - Optional function. Blanks the display.113 * @blank: the blank mode we want.114 * @info: frame buffer structure that represents a single frame buffer115 */116static int117bw2_blank(int blank, struct fb_info *info)118{119 struct bw2_par *par = (struct bw2_par *) info->par;120 struct bw2_regs __iomem *regs = par->regs;121 unsigned long flags;122 u8 val;123 124 spin_lock_irqsave(&par->lock, flags);125 126 switch (blank) {127 case FB_BLANK_UNBLANK: /* Unblanking */128 val = sbus_readb(®s->control);129 val |= BWTWO_CTL_ENABLE_VIDEO;130 sbus_writeb(val, ®s->control);131 par->flags &= ~BW2_FLAG_BLANKED;132 break;133 134 case FB_BLANK_NORMAL: /* Normal blanking */135 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */136 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */137 case FB_BLANK_POWERDOWN: /* Poweroff */138 val = sbus_readb(®s->control);139 val &= ~BWTWO_CTL_ENABLE_VIDEO;140 sbus_writeb(val, ®s->control);141 par->flags |= BW2_FLAG_BLANKED;142 break;143 }144 145 spin_unlock_irqrestore(&par->lock, flags);146 147 return 0;148}149 150static const struct sbus_mmap_map bw2_mmap_map[] = {151 {152 .size = SBUS_MMAP_FBSIZE(1)153 },154 { .size = 0 }155};156 157static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma)158{159 struct bw2_par *par = (struct bw2_par *)info->par;160 161 return sbusfb_mmap_helper(bw2_mmap_map,162 info->fix.smem_start, info->fix.smem_len,163 par->which_io,164 vma);165}166 167static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)168{169 return sbusfb_ioctl_helper(cmd, arg, info,170 FBTYPE_SUN2BW, 1, info->fix.smem_len);171}172 173/*174 * Initialisation175 */176 177static void bw2_init_fix(struct fb_info *info, int linebytes)178{179 strscpy(info->fix.id, "bwtwo", sizeof(info->fix.id));180 181 info->fix.type = FB_TYPE_PACKED_PIXELS;182 info->fix.visual = FB_VISUAL_MONO01;183 184 info->fix.line_length = linebytes;185 186 info->fix.accel = FB_ACCEL_SUN_BWTWO;187}188 189static u8 bw2regs_1600[] = {190 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13,191 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e,192 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01,193 0x10, 0x21, 0194};195 196static u8 bw2regs_ecl[] = {197 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c,198 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23,199 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01,200 0x10, 0x20, 0201};202 203static u8 bw2regs_analog[] = {204 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13,205 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22,206 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,207 0x10, 0x20, 0208};209 210static u8 bw2regs_76hz[] = {211 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,212 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,213 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,214 0x10, 0x24, 0215};216 217static u8 bw2regs_66hz[] = {218 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,219 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,220 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,221 0x10, 0x20, 0222};223 224static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,225 int *linebytes)226{227 u8 status, mon;228 u8 *p;229 230 status = sbus_readb(&par->regs->status);231 mon = status & BWTWO_SR_RES_MASK;232 switch (status & BWTWO_SR_ID_MASK) {233 case BWTWO_SR_ID_MONO_ECL:234 if (mon == BWTWO_SR_1600_1280) {235 p = bw2regs_1600;236 info->var.xres = info->var.xres_virtual = 1600;237 info->var.yres = info->var.yres_virtual = 1280;238 *linebytes = 1600 / 8;239 } else240 p = bw2regs_ecl;241 break;242 243 case BWTWO_SR_ID_MONO:244 p = bw2regs_analog;245 break;246 247 case BWTWO_SR_ID_MSYNC:248 if (mon == BWTWO_SR_1152_900_76_A ||249 mon == BWTWO_SR_1152_900_76_B)250 p = bw2regs_76hz;251 else252 p = bw2regs_66hz;253 break;254 255 case BWTWO_SR_ID_NOCONN:256 return 0;257 258 default:259 printk(KERN_ERR "bw2: can't handle SR %02x\n",260 status);261 return -EINVAL;262 }263 for ( ; *p; p += 2) {264 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];265 sbus_writeb(p[1], regp);266 }267 return 0;268}269 270static int bw2_probe(struct platform_device *op)271{272 struct device_node *dp = op->dev.of_node;273 struct fb_info *info;274 struct bw2_par *par;275 int linebytes, err;276 277 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);278 279 err = -ENOMEM;280 if (!info)281 goto out_err;282 par = info->par;283 284 spin_lock_init(&par->lock);285 286 info->fix.smem_start = op->resource[0].start;287 par->which_io = op->resource[0].flags & IORESOURCE_BITS;288 289 sbusfb_fill_var(&info->var, dp, 1);290 linebytes = of_getintprop_default(dp, "linebytes",291 info->var.xres);292 293 info->var.red.length = info->var.green.length =294 info->var.blue.length = info->var.bits_per_pixel;295 info->var.red.offset = info->var.green.offset =296 info->var.blue.offset = 0;297 298 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,299 sizeof(struct bw2_regs), "bw2 regs");300 if (!par->regs)301 goto out_release_fb;302 303 if (!of_property_present(dp, "width")) {304 err = bw2_do_default_mode(par, info, &linebytes);305 if (err)306 goto out_unmap_regs;307 }308 309 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);310 311 info->fbops = &bw2_ops;312 313 info->screen_base = of_ioremap(&op->resource[0], 0,314 info->fix.smem_len, "bw2 ram");315 if (!info->screen_base) {316 err = -ENOMEM;317 goto out_unmap_regs;318 }319 320 bw2_blank(FB_BLANK_UNBLANK, info);321 322 bw2_init_fix(info, linebytes);323 324 err = register_framebuffer(info);325 if (err < 0)326 goto out_unmap_screen;327 328 dev_set_drvdata(&op->dev, info);329 330 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",331 dp, par->which_io, info->fix.smem_start);332 333 return 0;334 335out_unmap_screen:336 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);337 338out_unmap_regs:339 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));340 341out_release_fb:342 framebuffer_release(info);343 344out_err:345 return err;346}347 348static void bw2_remove(struct platform_device *op)349{350 struct fb_info *info = dev_get_drvdata(&op->dev);351 struct bw2_par *par = info->par;352 353 unregister_framebuffer(info);354 355 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));356 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);357 358 framebuffer_release(info);359}360 361static const struct of_device_id bw2_match[] = {362 {363 .name = "bwtwo",364 },365 {},366};367MODULE_DEVICE_TABLE(of, bw2_match);368 369static struct platform_driver bw2_driver = {370 .driver = {371 .name = "bw2",372 .of_match_table = bw2_match,373 },374 .probe = bw2_probe,375 .remove = bw2_remove,376};377 378static int __init bw2_init(void)379{380 if (fb_get_options("bw2fb", NULL))381 return -ENODEV;382 383 return platform_driver_register(&bw2_driver);384}385 386static void __exit bw2_exit(void)387{388 platform_driver_unregister(&bw2_driver);389}390 391module_init(bw2_init);392module_exit(bw2_exit);393 394MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");395MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");396MODULE_VERSION("2.0");397MODULE_LICENSE("GPL");398