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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * HP300 Topcat framebuffer support (derived from macfb of all things)4 * Phil Blundell <philb@gnu.org> 19985 * DIO-II, colour map and Catseye support by6 * Kars de Jong <jongk@linux-m68k.org>, May 2004.7 */8 9#include <linux/module.h>10#include <linux/kernel.h>11#include <linux/errno.h>12#include <linux/string.h>13#include <linux/mm.h>14#include <linux/delay.h>15#include <linux/init.h>16#include <linux/fb.h>17#include <linux/dio.h>18 19#include <asm/io.h>20#include <linux/uaccess.h>21 22static struct fb_info fb_info = {23 .fix = {24 .id = "HP300 ",25 .type = FB_TYPE_PACKED_PIXELS,26 .visual = FB_VISUAL_PSEUDOCOLOR,27 .accel = FB_ACCEL_NONE,28 }29};30 31static unsigned long fb_regs;32static unsigned char fb_bitmask;33 34#define TC_NBLANK 0x408035#define TC_WEN 0x408836#define TC_REN 0x408c37#define TC_FBEN 0x409038#define TC_PRR 0x40ea39 40/* These defines match the X window system */41#define RR_CLEAR 0x042#define RR_COPY 0x343#define RR_NOOP 0x544#define RR_XOR 0x645#define RR_INVERT 0xa46#define RR_COPYINVERTED 0xc47#define RR_SET 0xf48 49/* blitter regs */50#define BUSY 0x404451#define WMRR 0x40ef52#define SOURCE_X 0x40f253#define SOURCE_Y 0x40f654#define DEST_X 0x40fa55#define DEST_Y 0x40fe56#define WHEIGHT 0x410657#define WWIDTH 0x410258#define WMOVE 0x409c59 60static struct fb_var_screeninfo hpfb_defined = {61 .red = {62 .length = 8,63 },64 .green = {65 .length = 8,66 },67 .blue = {68 .length = 8,69 },70 .activate = FB_ACTIVATE_NOW,71 .height = -1,72 .width = -1,73 .vmode = FB_VMODE_NONINTERLACED,74};75 76static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,77 unsigned blue, unsigned transp,78 struct fb_info *info)79{80 /* use MSBs */81 unsigned char _red =red>>8;82 unsigned char _green=green>>8;83 unsigned char _blue =blue>>8;84 unsigned char _regno=regno;85 86 /*87 * Set a single color register. The values supplied are88 * already rounded down to the hardware's capabilities89 * (according to the entries in the `var' structure). Return90 * != 0 for invalid regno.91 */92 93 if (regno >= info->cmap.len)94 return 1;95 96 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);97 98 out_be16(fb_regs + 0x60ba, 0xff);99 100 out_be16(fb_regs + 0x60b2, _red);101 out_be16(fb_regs + 0x60b4, _green);102 out_be16(fb_regs + 0x60b6, _blue);103 out_be16(fb_regs + 0x60b8, ~_regno);104 out_be16(fb_regs + 0x60f0, 0xff);105 106 udelay(100);107 108 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);109 out_be16(fb_regs + 0x60b2, 0);110 out_be16(fb_regs + 0x60b4, 0);111 out_be16(fb_regs + 0x60b6, 0);112 out_be16(fb_regs + 0x60b8, 0);113 114 return 0;115}116 117/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */118 119static int hpfb_blank(int blank, struct fb_info *info)120{121 out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));122 123 return 0;124}125 126static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)127{128 if (rr >= 0) {129 while (in_8(fb_regs + BUSY) & fb_bitmask)130 ;131 }132 out_8(fb_regs + TC_FBEN, fb_bitmask);133 if (rr >= 0) {134 out_8(fb_regs + TC_WEN, fb_bitmask);135 out_8(fb_regs + WMRR, rr);136 }137 out_be16(fb_regs + SOURCE_X, x0);138 out_be16(fb_regs + SOURCE_Y, y0);139 out_be16(fb_regs + DEST_X, x1);140 out_be16(fb_regs + DEST_Y, y1);141 out_be16(fb_regs + WWIDTH, w);142 out_be16(fb_regs + WHEIGHT, h);143 out_8(fb_regs + WMOVE, fb_bitmask);144}145 146static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)147{148 topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);149}150 151static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)152{153 u8 clr;154 155 clr = region->color & 0xff;156 157 while (in_8(fb_regs + BUSY) & fb_bitmask)158 ;159 160 /* Foreground */161 out_8(fb_regs + TC_WEN, fb_bitmask & clr);162 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));163 164 /* Background */165 out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);166 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));167 168 topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);169}170 171static int hpfb_sync(struct fb_info *info)172{173 /*174 * Since we also access the framebuffer directly, we have to wait175 * until the block mover is finished176 */177 while (in_8(fb_regs + BUSY) & fb_bitmask)178 ;179 180 out_8(fb_regs + TC_WEN, fb_bitmask);181 out_8(fb_regs + TC_PRR, RR_COPY);182 out_8(fb_regs + TC_FBEN, fb_bitmask);183 184 return 0;185}186 187static const struct fb_ops hpfb_ops = {188 .owner = THIS_MODULE,189 __FB_DEFAULT_IOMEM_OPS_RDWR,190 .fb_setcolreg = hpfb_setcolreg,191 .fb_blank = hpfb_blank,192 .fb_fillrect = hpfb_fillrect,193 .fb_copyarea = hpfb_copyarea,194 .fb_imageblit = cfb_imageblit,195 .fb_sync = hpfb_sync,196 __FB_DEFAULT_IOMEM_OPS_MMAP,197};198 199/* Common to all HP framebuffers */200#define HPFB_FBWMSB 0x05 /* Frame buffer width */201#define HPFB_FBWLSB 0x07202#define HPFB_FBHMSB 0x09 /* Frame buffer height */203#define HPFB_FBHLSB 0x0b204#define HPFB_DWMSB 0x0d /* Display width */205#define HPFB_DWLSB 0x0f206#define HPFB_DHMSB 0x11 /* Display height */207#define HPFB_DHLSB 0x13208#define HPFB_NUMPLANES 0x5b /* Number of colour planes */209#define HPFB_FBOMSB 0x5d /* Frame buffer offset */210#define HPFB_FBOLSB 0x5f211 212static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base)213{214 unsigned long fboff, fb_width, fb_height, fb_start;215 int ret;216 217 fb_regs = virt_base;218 fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);219 220 fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);221 222 if (phys_base >= DIOII_BASE) {223 fb_info.fix.smem_start += phys_base;224 }225 226 if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {227 /* This is the magic incantation the HP X server uses to make Catseye boards work. */228 while (in_be16(fb_regs+0x4800) & 1)229 ;230 out_be16(fb_regs+0x4800, 0); /* Catseye status */231 out_be16(fb_regs+0x4510, 0); /* VB */232 out_be16(fb_regs+0x4512, 0); /* TCNTRL */233 out_be16(fb_regs+0x4514, 0); /* ACNTRL */234 out_be16(fb_regs+0x4516, 0); /* PNCNTRL */235 out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */236 out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */237 out_be16(fb_regs+0x60bc, 0); /* Ram Select */238 }239 240 /*241 * Fill in the available video resolution242 */243 fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);244 fb_info.fix.line_length = fb_width;245 fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);246 fb_info.fix.smem_len = fb_width * fb_height;247 fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start,248 fb_info.fix.smem_len);249 hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);250 hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);251 hpfb_defined.xres_virtual = hpfb_defined.xres;252 hpfb_defined.yres_virtual = hpfb_defined.yres;253 hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);254 255 printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",256 fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);257 printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",258 hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);259 260 /*261 * Give the hardware a bit of a prod and work out how many bits per262 * pixel are supported.263 */264 out_8(fb_regs + TC_WEN, 0xff);265 out_8(fb_regs + TC_PRR, RR_COPY);266 out_8(fb_regs + TC_FBEN, 0xff);267 out_8(fb_start, 0xff);268 fb_bitmask = in_8(fb_start);269 out_8(fb_start, 0);270 271 /*272 * Enable reading/writing of all the planes.273 */274 out_8(fb_regs + TC_WEN, fb_bitmask);275 out_8(fb_regs + TC_PRR, RR_COPY);276 out_8(fb_regs + TC_REN, fb_bitmask);277 out_8(fb_regs + TC_FBEN, fb_bitmask);278 279 /*280 * Clear the screen.281 */282 topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);283 284 /*285 * Let there be consoles..286 */287 if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)288 strcat(fb_info.fix.id, "Topcat");289 else290 strcat(fb_info.fix.id, "Catseye");291 fb_info.fbops = &hpfb_ops;292 fb_info.var = hpfb_defined;293 fb_info.screen_base = (char *)fb_start;294 295 ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);296 if (ret < 0)297 goto unmap_screen_base;298 299 ret = register_framebuffer(&fb_info);300 if (ret < 0)301 goto dealloc_cmap;302 303 fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);304 305 return 0;306 307dealloc_cmap:308 fb_dealloc_cmap(&fb_info.cmap);309 310unmap_screen_base:311 if (fb_info.screen_base) {312 iounmap(fb_info.screen_base);313 fb_info.screen_base = NULL;314 }315 316 return ret;317}318 319/*320 * Check that the secondary ID indicates that we have some hope of working with this321 * framebuffer. The catseye boards are pretty much like topcats and we can muddle through.322 */323 324#define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \325 || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))326 327/*328 * Initialise the framebuffer329 */330static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent)331{332 unsigned long paddr, vaddr;333 334 paddr = d->resource.start;335 if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name))336 return -EBUSY;337 338 if (d->scode >= DIOII_SCBASE) {339 vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource));340 } else {341 vaddr = paddr + DIO_VIRADDRBASE;342 }343 printk(KERN_INFO "Topcat found at DIO select code %d "344 "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);345 if (hpfb_init_one(paddr, vaddr)) {346 if (d->scode >= DIOII_SCBASE)347 iounmap((void *)vaddr);348 release_mem_region(d->resource.start, resource_size(&d->resource));349 return -ENOMEM;350 }351 return 0;352}353 354static void hpfb_remove_one(struct dio_dev *d)355{356 unregister_framebuffer(&fb_info);357 if (d->scode >= DIOII_SCBASE)358 iounmap((void *)fb_regs);359 release_mem_region(d->resource.start, resource_size(&d->resource));360 fb_dealloc_cmap(&fb_info.cmap);361 if (fb_info.screen_base)362 iounmap(fb_info.screen_base);363}364 365static struct dio_device_id hpfb_dio_tbl[] = {366 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },367 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },368 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },369 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },370 { 0 }371};372 373static struct dio_driver hpfb_driver = {374 .name = "hpfb",375 .id_table = hpfb_dio_tbl,376 .probe = hpfb_dio_probe,377 .remove = hpfb_remove_one,378};379 380static int __init hpfb_init(void)381{382 unsigned int sid;383 unsigned char i;384 int err;385 386 /* Topcats can be on the internal IO bus or real DIO devices.387 * The internal variant sits at 0x560000; it has primary388 * and secondary ID registers just like the DIO version.389 * So we merge the two detection routines.390 *391 * Perhaps this #define should be in a global header file:392 * I believe it's common to all internal fbs, not just topcat.393 */394#define INTFBVADDR 0xf0560000395#define INTFBPADDR 0x560000396 397 if (!MACH_IS_HP300)398 return -ENODEV;399 400 if (fb_get_options("hpfb", NULL))401 return -ENODEV;402 403 err = dio_register_driver(&hpfb_driver);404 if (err)405 return err;406 407 err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);408 409 if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {410 if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))411 return -EBUSY;412 printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);413 if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {414 return -ENOMEM;415 }416 }417 return 0;418}419 420static void __exit hpfb_cleanup_module(void)421{422 dio_unregister_driver(&hpfb_driver);423}424 425module_init(hpfb_init);426module_exit(hpfb_cleanup_module);427 428MODULE_LICENSE("GPL");429