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#include <asm/system.h> 33 34#include <video/pmagb-b-fb.h> 35 36 37struct pmagbbfb_par { 38 volatile void __iomem *mmio; 39 volatile void __iomem *smem; 40 volatile u32 __iomem *sfb; 41 volatile u32 __iomem *dac; 42 unsigned int osc0; 43 unsigned int osc1; 44 int slot; 45}; 46 47 48static struct fb_var_screeninfo pmagbbfb_defined __initdata = { 49 .bits_per_pixel = 8, 50 .red.length = 8, 51 .green.length = 8, 52 .blue.length = 8, 53 .activate = FB_ACTIVATE_NOW, 54 .height = -1, 55 .width = -1, 56 .accel_flags = FB_ACCEL_NONE, 57 .sync = FB_SYNC_ON_GREEN, 58 .vmode = FB_VMODE_NONINTERLACED, 59}; 60 61static struct fb_fix_screeninfo pmagbbfb_fix __initdata = { 62 .id = "PMAGB-BA", 63 .smem_len = (2048 * 1024), 64 .type = FB_TYPE_PACKED_PIXELS, 65 .visual = FB_VISUAL_PSEUDOCOLOR, 66 .mmio_len = PMAGB_B_FBMEM, 67}; 68 69 70static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) 71{ 72 writel(v, par->sfb + reg / 4); 73} 74 75static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) 76{ 77 return readl(par->sfb + reg / 4); 78} 79 80static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) 81{ 82 writeb(v, par->dac + reg / 4); 83} 84 85static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) 86{ 87 return readb(par->dac + reg / 4); 88} 89 90static inline void gp0_write(struct pmagbbfb_par *par, u32 v) 91{ 92 writel(v, par->mmio + PMAGB_B_GP0); 93} 94 95 96/* 97 * Set the palette. 98 */ 99static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, 100 unsigned int green, unsigned int blue, 101 unsigned int transp, struct fb_info *info) 102{ 103 struct pmagbbfb_par *par = info->par; 104 105 BUG_ON(regno >= info->cmap.len); 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 124static struct fb_ops pmagbbfb_ops = { 125 .owner = THIS_MODULE, 126 .fb_setcolreg = pmagbbfb_setcolreg, 127 .fb_fillrect = cfb_fillrect, 128 .fb_copyarea = cfb_copyarea, 129 .fb_imageblit = cfb_imageblit, 130}; 131 132 133/* 134 * Turn the hardware cursor off. 135 */ 136static void __init pmagbbfb_erase_cursor(struct fb_info *info) 137{ 138 struct pmagbbfb_par *par = info->par; 139 140 mb(); 141 dac_write(par, BT459_ADDR_LO, 0x00); 142 dac_write(par, BT459_ADDR_HI, 0x03); 143 wmb(); 144 dac_write(par, BT459_DATA, 0x00); 145} 146 147/* 148 * Set up screen parameters. 149 */ 150static void __init pmagbbfb_screen_setup(struct fb_info *info) 151{ 152 struct pmagbbfb_par *par = info->par; 153 154 info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> 155 SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; 156 info->var.xres_virtual = info->var.xres; 157 info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> 158 SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; 159 info->var.yres_virtual = info->var.yres; 160 info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> 161 SFB_VID_HOR_BP_SHIFT) & 162 SFB_VID_HOR_BP_MASK) * 4; 163 info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> 164 SFB_VID_HOR_FP_SHIFT) & 165 SFB_VID_HOR_FP_MASK) * 4; 166 info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> 167 SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; 168 info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> 169 SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; 170 info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> 171 SFB_VID_HOR_SYN_SHIFT) & 172 SFB_VID_HOR_SYN_MASK) * 4; 173 info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> 174 SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; 175 176 info->fix.line_length = info->var.xres; 177}; 178 179/* 180 * Determine oscillator configuration. 181 */ 182static void __init pmagbbfb_osc_setup(struct fb_info *info) 183{ 184 static unsigned int pmagbbfb_freqs[] __initdata = { 185 130808, 119843, 104000, 92980, 74370, 72800, 186 69197, 66000, 65000, 50350, 36000, 32000, 25175 187 }; 188 struct pmagbbfb_par *par = info->par; 189 struct tc_bus *tbus = to_tc_dev(info->device)->bus; 190 u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; 191 u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; 192 int i, j; 193 194 gp0_write(par, 0); /* select Osc0 */ 195 for (j = 0; j < 16; j++) { 196 mb(); 197 sfb_write(par, SFB_REG_TCCLK_COUNT, 0); 198 mb(); 199 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ 200 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) 201 break; 202 udelay(1); 203 } 204 count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); 205 } 206 207 gp0_write(par, 1); /* select Osc1 */ 208 for (j = 0; j < 16; j++) { 209 mb(); 210 sfb_write(par, SFB_REG_TCCLK_COUNT, 0); 211 212 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ 213 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) 214 break; 215 udelay(1); 216 } 217 count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); 218 } 219 220 freq0 = (freqtc * count0 + counttc / 2) / counttc; 221 par->osc0 = freq0; 222 if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && 223 freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) 224 par->osc0 = pmagbbfb_freqs[0]; 225 226 freq1 = (par->osc0 * count1 + count0 / 2) / count0; 227 par->osc1 = freq1; 228 for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) 229 if (freq1 >= pmagbbfb_freqs[i] - 230 (pmagbbfb_freqs[i] + 128) / 256 && 231 freq1 <= pmagbbfb_freqs[i] + 232 (pmagbbfb_freqs[i] + 128) / 256) { 233 par->osc1 = pmagbbfb_freqs[i]; 234 break; 235 } 236 237 if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || 238 par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512) 239 par->osc1 = 0; 240 241 gp0_write(par, par->osc1 != 0); /* reselect OscX */ 242 243 info->var.pixclock = par->osc1 ? 244 (1000000000 + par->osc1 / 2) / par->osc1 : 245 (1000000000 + par->osc0 / 2) / par->osc0; 246}; 247 248 249static int __init pmagbbfb_probe(struct device *dev) 250{ 251 struct tc_dev *tdev = to_tc_dev(dev); 252 resource_size_t start, len; 253 struct fb_info *info; 254 struct pmagbbfb_par *par; 255 char freq0[12], freq1[12]; 256 u32 vid_base; 257 258 info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev); 259 if (!info) 260 return -ENOMEM; 261 262 par = info->par; 263 dev_set_drvdata(dev, info); 264 265 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) 266 goto err_alloc; 267 268 info->fbops = &pmagbbfb_ops; 269 info->fix = pmagbbfb_fix; 270 info->var = pmagbbfb_defined; 271 info->flags = FBINFO_DEFAULT; 272 273 /* Request the I/O MEM resource. */ 274 start = tdev->resource.start; 275 len = tdev->resource.end - start + 1; 276 if (!request_mem_region(start, len, dev->bus_id)) 277 goto err_cmap; 278 279 /* MMIO mapping setup. */ 280 info->fix.mmio_start = start; 281 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); 282 if (!par->mmio) 283 goto err_resource; 284 par->sfb = par->mmio + PMAGB_B_SFB; 285 par->dac = par->mmio + PMAGB_B_BT459; 286 287 /* Frame buffer mapping setup. */ 288 info->fix.smem_start = start + PMAGB_B_FBMEM; 289 par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); 290 if (!par->smem) 291 goto err_mmio_map; 292 vid_base = sfb_read(par, SFB_REG_VID_BASE); 293 info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; 294 info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; 295 296 pmagbbfb_erase_cursor(info); 297 pmagbbfb_screen_setup(info); 298 pmagbbfb_osc_setup(info); 299 300 if (register_framebuffer(info) < 0) 301 goto err_smem_map; 302 303 get_device(dev); 304 305 snprintf(freq0, sizeof(freq0), "%u.%03uMHz", 306 par->osc0 / 1000, par->osc0 % 1000); 307 snprintf(freq1, sizeof(freq1), "%u.%03uMHz", 308 par->osc1 / 1000, par->osc1 % 1000); 309 310 pr_info("fb%d: %s frame buffer device at %s\n", 311 info->node, info->fix.id, dev->bus_id); 312 pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n", 313 info->node, freq0, par->osc1 ? freq1 : "disabled", 314 par->osc1 != 0); 315 316 return 0; 317 318 319err_smem_map: 320 iounmap(par->smem); 321 322err_mmio_map: 323 iounmap(par->mmio); 324 325err_resource: 326 release_mem_region(start, len); 327 328err_cmap: 329 fb_dealloc_cmap(&info->cmap); 330 331err_alloc: 332 framebuffer_release(info); 333 return -ENXIO; 334} 335 336static int __exit pmagbbfb_remove(struct device *dev) 337{ 338 struct tc_dev *tdev = to_tc_dev(dev); 339 struct fb_info *info = dev_get_drvdata(dev); 340 struct pmagbbfb_par *par = info->par; 341 resource_size_t start, len; 342 343 put_device(dev); 344 unregister_framebuffer(info); 345 iounmap(par->smem); 346 iounmap(par->mmio); 347 start = tdev->resource.start; 348 len = tdev->resource.end - start + 1; 349 release_mem_region(start, len); 350 fb_dealloc_cmap(&info->cmap); 351 framebuffer_release(info); 352 return 0; 353} 354 355 356/* 357 * Initialize the framebuffer. 358 */ 359static const struct tc_device_id pmagbbfb_tc_table[] = { 360 { "DEC ", "PMAGB-BA" }, 361 { } 362}; 363MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); 364 365static struct tc_driver pmagbbfb_driver = { 366 .id_table = pmagbbfb_tc_table, 367 .driver = { 368 .name = "pmagbbfb", 369 .bus = &tc_bus_type, 370 .probe = pmagbbfb_probe, 371 .remove = __exit_p(pmagbbfb_remove), 372 }, 373}; 374 375static int __init pmagbbfb_init(void) 376{ 377#ifndef MODULE 378 if (fb_get_options("pmagbbfb", NULL)) 379 return -ENXIO; 380#endif 381 return tc_register_driver(&pmagbbfb_driver); 382} 383 384static void __exit pmagbbfb_exit(void) 385{ 386 tc_unregister_driver(&pmagbbfb_driver); 387} 388 389 390module_init(pmagbbfb_init); 391module_exit(pmagbbfb_exit); 392 393MODULE_LICENSE("GPL"); 394