linux/drivers/video/pmagb-b-fb.c
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   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
  36struct 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
  47static struct fb_var_screeninfo pmagbbfb_defined __devinitdata = {
  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
  60static struct fb_fix_screeninfo pmagbbfb_fix __devinitdata = {
  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
  69static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)
  70{
  71        writel(v, par->sfb + reg / 4);
  72}
  73
  74static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
  75{
  76        return readl(par->sfb + reg / 4);
  77}
  78
  79static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
  80{
  81        writeb(v, par->dac + reg / 4);
  82}
  83
  84static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)
  85{
  86        return readb(par->dac + reg / 4);
  87}
  88
  89static 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 */
  98static 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
 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 __devinit 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 __devinit pmagbbfb_osc_setup(struct fb_info *info)
 183{
 184        static unsigned int pmagbbfb_freqs[] __devinitdata = {
 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 __devinit 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        int err;
 258
 259        info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);
 260        if (!info) {
 261                printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
 262                return -ENOMEM;
 263        }
 264
 265        par = info->par;
 266        dev_set_drvdata(dev, info);
 267
 268        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 269                printk(KERN_ERR "%s: Cannot allocate color map\n",
 270                       dev_name(dev));
 271                err = -ENOMEM;
 272                goto err_alloc;
 273        }
 274
 275        info->fbops = &pmagbbfb_ops;
 276        info->fix = pmagbbfb_fix;
 277        info->var = pmagbbfb_defined;
 278        info->flags = FBINFO_DEFAULT;
 279
 280        /* Request the I/O MEM resource.  */
 281        start = tdev->resource.start;
 282        len = tdev->resource.end - start + 1;
 283        if (!request_mem_region(start, len, dev_name(dev))) {
 284                printk(KERN_ERR "%s: Cannot reserve FB region\n",
 285                       dev_name(dev));
 286                err = -EBUSY;
 287                goto err_cmap;
 288        }
 289
 290        /* MMIO mapping setup.  */
 291        info->fix.mmio_start = start;
 292        par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
 293        if (!par->mmio) {
 294                printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
 295                err = -ENOMEM;
 296                goto err_resource;
 297        }
 298        par->sfb = par->mmio + PMAGB_B_SFB;
 299        par->dac = par->mmio + PMAGB_B_BT459;
 300
 301        /* Frame buffer mapping setup.  */
 302        info->fix.smem_start = start + PMAGB_B_FBMEM;
 303        par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
 304        if (!par->smem) {
 305                printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
 306                err = -ENOMEM;
 307                goto err_mmio_map;
 308        }
 309        vid_base = sfb_read(par, SFB_REG_VID_BASE);
 310        info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;
 311        info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;
 312
 313        pmagbbfb_erase_cursor(info);
 314        pmagbbfb_screen_setup(info);
 315        pmagbbfb_osc_setup(info);
 316
 317        err = register_framebuffer(info);
 318        if (err < 0) {
 319                printk(KERN_ERR "%s: Cannot register framebuffer\n",
 320                       dev_name(dev));
 321                goto err_smem_map;
 322        }
 323
 324        get_device(dev);
 325
 326        snprintf(freq0, sizeof(freq0), "%u.%03uMHz",
 327                 par->osc0 / 1000, par->osc0 % 1000);
 328        snprintf(freq1, sizeof(freq1), "%u.%03uMHz",
 329                 par->osc1 / 1000, par->osc1 % 1000);
 330
 331        pr_info("fb%d: %s frame buffer device at %s\n",
 332                info->node, info->fix.id, dev_name(dev));
 333        pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n",
 334                info->node, freq0, par->osc1 ? freq1 : "disabled",
 335                par->osc1 != 0);
 336
 337        return 0;
 338
 339
 340err_smem_map:
 341        iounmap(par->smem);
 342
 343err_mmio_map:
 344        iounmap(par->mmio);
 345
 346err_resource:
 347        release_mem_region(start, len);
 348
 349err_cmap:
 350        fb_dealloc_cmap(&info->cmap);
 351
 352err_alloc:
 353        framebuffer_release(info);
 354        return err;
 355}
 356
 357static int __exit pmagbbfb_remove(struct device *dev)
 358{
 359        struct tc_dev *tdev = to_tc_dev(dev);
 360        struct fb_info *info = dev_get_drvdata(dev);
 361        struct pmagbbfb_par *par = info->par;
 362        resource_size_t start, len;
 363
 364        put_device(dev);
 365        unregister_framebuffer(info);
 366        iounmap(par->smem);
 367        iounmap(par->mmio);
 368        start = tdev->resource.start;
 369        len = tdev->resource.end - start + 1;
 370        release_mem_region(start, len);
 371        fb_dealloc_cmap(&info->cmap);
 372        framebuffer_release(info);
 373        return 0;
 374}
 375
 376
 377/*
 378 * Initialize the framebuffer.
 379 */
 380static const struct tc_device_id pmagbbfb_tc_table[] = {
 381        { "DEC     ", "PMAGB-BA" },
 382        { }
 383};
 384MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table);
 385
 386static struct tc_driver pmagbbfb_driver = {
 387        .id_table       = pmagbbfb_tc_table,
 388        .driver         = {
 389                .name   = "pmagbbfb",
 390                .bus    = &tc_bus_type,
 391                .probe  = pmagbbfb_probe,
 392                .remove = __exit_p(pmagbbfb_remove),
 393        },
 394};
 395
 396static int __init pmagbbfb_init(void)
 397{
 398#ifndef MODULE
 399        if (fb_get_options("pmagbbfb", NULL))
 400                return -ENXIO;
 401#endif
 402        return tc_register_driver(&pmagbbfb_driver);
 403}
 404
 405static void __exit pmagbbfb_exit(void)
 406{
 407        tc_unregister_driver(&pmagbbfb_driver);
 408}
 409
 410
 411module_init(pmagbbfb_init);
 412module_exit(pmagbbfb_exit);
 413
 414MODULE_LICENSE("GPL");
 415
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