1 /* 2 * linux/drivers/video/pmagb-b-fb.c 3 * 4 * PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support, 5 * derived from: 6 * "HP300 Topcat framebuffer support (derived from macfb of all things) 7 * Phil Blundell <philb@gnu.org> 1998", the original code can be 8 * found in the file hpfb.c in the same directory. 9 * 10 * DECstation related code Copyright (C) 1999, 2000, 2001 by 11 * Michael Engel <engel@unix-ag.org>, 12 * Karsten Merker <merker@linuxtag.org> and 13 * Harald Koerfgen. 14 * Copyright (c) 2005, 2006 Maciej W. Rozycki 15 * 16 * This file is subject to the terms and conditions of the GNU General 17 * Public License. See the file COPYING in the main directory of this 18 * archive for more details. 19 */ 20 21 #include <linux/compiler.h> 22 #include <linux/delay.h> 23 #include <linux/errno.h> 24 #include <linux/fb.h> 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/tc.h> 29 #include <linux/types.h> 30 31 #include <asm/io.h> 32 33 #include <video/pmagb-b-fb.h> 34 35 36 struct pmagbbfb_par { 37 volatile void __iomem *mmio; 38 volatile void __iomem *smem; 39 volatile u32 __iomem *sfb; 40 volatile u32 __iomem *dac; 41 unsigned int osc0; 42 unsigned int osc1; 43 int slot; 44 }; 45 46 47 static const struct fb_var_screeninfo pmagbbfb_defined = { 48 .bits_per_pixel = 8, 49 .red.length = 8, 50 .green.length = 8, 51 .blue.length = 8, 52 .activate = FB_ACTIVATE_NOW, 53 .height = -1, 54 .width = -1, 55 .accel_flags = FB_ACCEL_NONE, 56 .sync = FB_SYNC_ON_GREEN, 57 .vmode = FB_VMODE_NONINTERLACED, 58 }; 59 60 static const struct fb_fix_screeninfo pmagbbfb_fix = { 61 .id = "PMAGB-BA", 62 .smem_len = (2048 * 1024), 63 .type = FB_TYPE_PACKED_PIXELS, 64 .visual = FB_VISUAL_PSEUDOCOLOR, 65 .mmio_len = PMAGB_B_FBMEM, 66 }; 67 68 69 static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) 70 { 71 writel(v, par->sfb + reg / 4); 72 } 73 74 static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) 75 { 76 return readl(par->sfb + reg / 4); 77 } 78 79 static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) 80 { 81 writeb(v, par->dac + reg / 4); 82 } 83 84 static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) 85 { 86 return readb(par->dac + reg / 4); 87 } 88 89 static inline void gp0_write(struct pmagbbfb_par *par, u32 v) 90 { 91 writel(v, par->mmio + PMAGB_B_GP0); 92 } 93 94 95 /* 96 * Set the palette. 97 */ 98 static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, 99 unsigned int green, unsigned int blue, 100 unsigned int transp, struct fb_info *info) 101 { 102 struct pmagbbfb_par *par = info->par; 103 104 if (regno >= info->cmap.len) 105 return 1; 106 107 red >>= 8; /* The cmap fields are 16 bits */ 108 green >>= 8; /* wide, but the hardware colormap */ 109 blue >>= 8; /* registers are only 8 bits wide */ 110 111 mb(); 112 dac_write(par, BT459_ADDR_LO, regno); 113 dac_write(par, BT459_ADDR_HI, 0x00); 114 wmb(); 115 dac_write(par, BT459_CMAP, red); 116 wmb(); 117 dac_write(par, BT459_CMAP, green); 118 wmb(); 119 dac_write(par, BT459_CMAP, blue); 120 121 return 0; 122 } 123 124 static const struct fb_ops pmagbbfb_ops = { 125 .owner = THIS_MODULE, 126 FB_DEFAULT_IOMEM_OPS, 127 .fb_setcolreg = pmagbbfb_setcolreg, 128 }; 129 130 131 /* 132 * Turn the hardware cursor off. 133 */ 134 static void pmagbbfb_erase_cursor(struct fb_info *info) 135 { 136 struct pmagbbfb_par *par = info->par; 137 138 mb(); 139 dac_write(par, BT459_ADDR_LO, 0x00); 140 dac_write(par, BT459_ADDR_HI, 0x03); 141 wmb(); 142 dac_write(par, BT459_DATA, 0x00); 143 } 144 145 /* 146 * Set up screen parameters. 147 */ 148 static void pmagbbfb_screen_setup(struct fb_info *info) 149 { 150 struct pmagbbfb_par *par = info->par; 151 152 info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> 153 SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; 154 info->var.xres_virtual = info->var.xres; 155 info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> 156 SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; 157 info->var.yres_virtual = info->var.yres; 158 info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> 159 SFB_VID_HOR_BP_SHIFT) & 160 SFB_VID_HOR_BP_MASK) * 4; 161 info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> 162 SFB_VID_HOR_FP_SHIFT) & 163 SFB_VID_HOR_FP_MASK) * 4; 164 info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> 165 SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; 166 info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> 167 SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; 168 info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> 169 SFB_VID_HOR_SYN_SHIFT) & 170 SFB_VID_HOR_SYN_MASK) * 4; 171 info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> 172 SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; 173 174 info->fix.line_length = info->var.xres; 175 }; 176 177 /* 178 * Determine oscillator configuration. 179 */ 180 static void pmagbbfb_osc_setup(struct fb_info *info) 181 { 182 static unsigned int pmagbbfb_freqs[] = { 183 130808, 119843, 104000, 92980, 74370, 72800, 184 69197, 66000, 65000, 50350, 36000, 32000, 25175 185 }; 186 struct pmagbbfb_par *par = info->par; 187 struct tc_bus *tbus = to_tc_dev(info->device)->bus; 188 u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; 189 u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; 190 int i, j; 191 192 gp0_write(par, 0); /* select Osc0 */ 193 for (j = 0; j < 16; j++) { 194 mb(); 195 sfb_write(par, SFB_REG_TCCLK_COUNT, 0); 196 mb(); 197 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ 198 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) 199 break; 200 udelay(1); 201 } 202 count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); 203 } 204 205 gp0_write(par, 1); /* select Osc1 */ 206 for (j = 0; j < 16; j++) { 207 mb(); 208 sfb_write(par, SFB_REG_TCCLK_COUNT, 0); 209 210 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ 211 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) 212 break; 213 udelay(1); 214 } 215 count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); 216 } 217 218 freq0 = (freqtc * count0 + counttc / 2) / counttc; 219 par->osc0 = freq0; 220 if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && 221 freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) 222 par->osc0 = pmagbbfb_freqs[0]; 223 224 freq1 = (par->osc0 * count1 + count0 / 2) / count0; 225 par->osc1 = freq1; 226 for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) 227 if (freq1 >= pmagbbfb_freqs[i] - 228 (pmagbbfb_freqs[i] + 128) / 256 && 229 freq1 <= pmagbbfb_freqs[i] + 230 (pmagbbfb_freqs[i] + 128) / 256) { 231 par->osc1 = pmagbbfb_freqs[i]; 232 break; 233 } 234 235 if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || 236 par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512) 237 par->osc1 = 0; 238 239 gp0_write(par, par->osc1 != 0); /* reselect OscX */ 240 241 info->var.pixclock = par->osc1 ? 242 (1000000000 + par->osc1 / 2) / par->osc1 : 243 (1000000000 + par->osc0 / 2) / par->osc0; 244 }; 245 246 247 static int pmagbbfb_probe(struct device *dev) 248 { 249 struct tc_dev *tdev = to_tc_dev(dev); 250 resource_size_t start, len; 251 struct fb_info *info; 252 struct pmagbbfb_par *par; 253 char freq0[12], freq1[12]; 254 u32 vid_base; 255 int err; 256 257 info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev); 258 if (!info) 259 return -ENOMEM; 260 261 par = info->par; 262 dev_set_drvdata(dev, info); 263 264 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 265 printk(KERN_ERR "%s: Cannot allocate color map\n", 266 dev_name(dev)); 267 err = -ENOMEM; 268 goto err_alloc; 269 } 270 271 info->fbops = &pmagbbfb_ops; 272 info->fix = pmagbbfb_fix; 273 info->var = pmagbbfb_defined; 274 275 /* Request the I/O MEM resource. */ 276 start = tdev->resource.start; 277 len = tdev->resource.end - start + 1; 278 if (!request_mem_region(start, len, dev_name(dev))) { 279 printk(KERN_ERR "%s: Cannot reserve FB region\n", 280 dev_name(dev)); 281 err = -EBUSY; 282 goto err_cmap; 283 } 284 285 /* MMIO mapping setup. */ 286 info->fix.mmio_start = start; 287 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); 288 if (!par->mmio) { 289 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); 290 err = -ENOMEM; 291 goto err_resource; 292 } 293 par->sfb = par->mmio + PMAGB_B_SFB; 294 par->dac = par->mmio + PMAGB_B_BT459; 295 296 /* Frame buffer mapping setup. */ 297 info->fix.smem_start = start + PMAGB_B_FBMEM; 298 par->smem = ioremap(info->fix.smem_start, info->fix.smem_len); 299 if (!par->smem) { 300 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); 301 err = -ENOMEM; 302 goto err_mmio_map; 303 } 304 vid_base = sfb_read(par, SFB_REG_VID_BASE); 305 info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; 306 info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; 307 308 pmagbbfb_erase_cursor(info); 309 pmagbbfb_screen_setup(info); 310 pmagbbfb_osc_setup(info); 311 312 err = register_framebuffer(info); 313 if (err < 0) { 314 printk(KERN_ERR "%s: Cannot register framebuffer\n", 315 dev_name(dev)); 316 goto err_smem_map; 317 } 318 319 get_device(dev); 320 321 snprintf(freq0, sizeof(freq0), "%u.%03uMHz", 322 par->osc0 / 1000, par->osc0 % 1000); 323 snprintf(freq1, sizeof(freq1), "%u.%03uMHz", 324 par->osc1 / 1000, par->osc1 % 1000); 325 326 fb_info(info, "%s frame buffer device at %s\n", 327 info->fix.id, dev_name(dev)); 328 fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n", 329 freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0); 330 331 return 0; 332 333 334 err_smem_map: 335 iounmap(par->smem); 336 337 err_mmio_map: 338 iounmap(par->mmio); 339 340 err_resource: 341 release_mem_region(start, len); 342 343 err_cmap: 344 fb_dealloc_cmap(&info->cmap); 345 346 err_alloc: 347 framebuffer_release(info); 348 return err; 349 } 350 351 static int pmagbbfb_remove(struct device *dev) 352 { 353 struct tc_dev *tdev = to_tc_dev(dev); 354 struct fb_info *info = dev_get_drvdata(dev); 355 struct pmagbbfb_par *par = info->par; 356 resource_size_t start, len; 357 358 put_device(dev); 359 unregister_framebuffer(info); 360 iounmap(par->smem); 361 iounmap(par->mmio); 362 start = tdev->resource.start; 363 len = tdev->resource.end - start + 1; 364 release_mem_region(start, len); 365 fb_dealloc_cmap(&info->cmap); 366 framebuffer_release(info); 367 return 0; 368 } 369 370 371 /* 372 * Initialize the framebuffer. 373 */ 374 static const struct tc_device_id pmagbbfb_tc_table[] = { 375 { "DEC ", "PMAGB-BA" }, 376 { } 377 }; 378 MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); 379 380 static struct tc_driver pmagbbfb_driver = { 381 .id_table = pmagbbfb_tc_table, 382 .driver = { 383 .name = "pmagbbfb", 384 .bus = &tc_bus_type, 385 .probe = pmagbbfb_probe, 386 .remove = pmagbbfb_remove, 387 }, 388 }; 389 390 static int __init pmagbbfb_init(void) 391 { 392 #ifndef MODULE 393 if (fb_get_options("pmagbbfb", NULL)) 394 return -ENXIO; 395 #endif 396 return tc_register_driver(&pmagbbfb_driver); 397 } 398 399 static void __exit pmagbbfb_exit(void) 400 { 401 tc_unregister_driver(&pmagbbfb_driver); 402 } 403 404 405 module_init(pmagbbfb_init); 406 module_exit(pmagbbfb_exit); 407 408 MODULE_LICENSE("GPL"); 409