sys/arm/lpc/lpc_fb.c

   1 /*-
   2  * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/bio.h>
  33 #include <sys/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/endian.h>
  36 #include <sys/kernel.h>
  37 #include <sys/kthread.h>
  38 #include <sys/lock.h>
  39 #include <sys/malloc.h>
  40 #include <sys/module.h>
  41 #include <sys/mutex.h>
  42 #include <sys/queue.h>
  43 #include <sys/resource.h>
  44 #include <sys/rman.h>
  45 #include <sys/time.h>
  46 #include <sys/timetc.h>
  47 #include <sys/watchdog.h>
  48
  49 #include <sys/kdb.h>
  50
  51 #include <machine/bus.h>
  52 #include <machine/cpu.h>
  53 #include <machine/cpufunc.h>
  54 #include <machine/resource.h>
  55 #include <machine/intr.h>
  56
  57 #include <dev/fdt/fdt_common.h>
  58 #include <dev/ofw/ofw_bus.h>
  59 #include <dev/ofw/ofw_bus_subr.h>
  60
  61 #include <arm/lpc/lpcreg.h>
  62 #include <arm/lpc/lpcvar.h>
  63
  64
  65 struct lpc_fb_dmamap_arg {
  66         bus_addr_t              lf_dma_busaddr;
  67 };
  68
  69 struct lpc_lcd_config {
  70         int                     lc_xres;
  71         int                     lc_yres;
  72         int                     lc_bpp;
  73         uint32_t                lc_pixelclock;
  74         int                     lc_left_margin;
  75         int                     lc_right_margin;
  76         int                     lc_upper_margin;
  77         int                     lc_lower_margin;
  78         int                     lc_hsync_len;
  79         int                     lc_vsync_len;
  80 };
  81
  82 struct lpc_fb_softc {
  83         device_t                lf_dev;
  84         struct cdev *           lf_cdev;
  85         struct mtx              lf_mtx;
  86         struct resource *       lf_mem_res;
  87         struct resource *       lf_irq_res;
  88         bus_space_tag_t         lf_bst;
  89         bus_space_handle_t      lf_bsh;
  90         void *                  lf_intrhand;
  91         bus_dma_tag_t           lf_dma_tag;
  92         bus_dmamap_t            lf_dma_map;
  93         void *                  lf_buffer;
  94         bus_addr_t              lf_buffer_phys;
  95         bus_size_t              lf_buffer_size;
  96         struct lpc_lcd_config   lf_lcd_config;
  97         int                     lf_initialized;
  98         int                     lf_opened;
  99 };
 100
 101 extern void ssd1289_configure(void);
 102
 103 #define lpc_fb_lock(_sc)        mtx_lock(&(_sc)->lf_mtx)
 104 #define lpc_fb_unlock(_sc)      mtx_unlock(&(_sc)->lf_mtx)
 105 #define lpc_fb_lock_assert(sc)  mtx_assert(&(_sc)->lf_mtx, MA_OWNED)
 106
 107 #define lpc_fb_read_4(_sc, _reg)                \
 108     bus_space_read_4((_sc)->lf_bst, (_sc)->lf_bsh, (_reg))
 109 #define lpc_fb_write_4(_sc, _reg, _val)         \
 110     bus_space_write_4((_sc)->lf_bst, (_sc)->lf_bsh, (_reg), (_val))
 111
 112
 113
 114 static int lpc_fb_probe(device_t);
 115 static int lpc_fb_attach(device_t);
 116 static void lpc_fb_intr(void *);
 117 static void lpc_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err);
 118
 119 static int lpc_fb_fdt_read(phandle_t, const char *, uint32_t *);
 120 static int lpc_fb_read_lcd_config(phandle_t, struct lpc_lcd_config *);
 121
 122 static int lpc_fb_open(struct cdev *, int, int, struct thread *);
 123 static int lpc_fb_close(struct cdev *, int, int, struct thread *);
 124 static int lpc_fb_ioctl(struct cdev *, u_long, caddr_t, int, struct thread *);
 125 static int lpc_fb_mmap(struct cdev *, vm_ooffset_t, vm_paddr_t *, int, vm_memattr_t *);
 126
 127 static void lpc_fb_blank(struct lpc_fb_softc *);
 128
 129 static struct cdevsw lpc_fb_cdevsw = {
 130         .d_open         = lpc_fb_open,
 131         .d_close        = lpc_fb_close,
 132         .d_ioctl        = lpc_fb_ioctl,
 133         .d_mmap         = lpc_fb_mmap,
 134         .d_name         = "lpcfb",
 135         .d_version      = D_VERSION,
 136 };
 137
 138 static int
 139 lpc_fb_probe(device_t dev)
 140 {
 141         if (!ofw_bus_is_compatible(dev, "lpc,fb"))
 142                 return (ENXIO);
 143
 144         device_set_desc(dev, "LPC32x0 framebuffer device");
 145         return (BUS_PROBE_DEFAULT);
 146 }
 147
 148 static int
 149 lpc_fb_attach(device_t dev)
 150 {
 151         struct lpc_fb_softc *sc = device_get_softc(dev);
 152         struct lpc_fb_dmamap_arg ctx;
 153         phandle_t node;
 154         int mode, rid, err = 0;
 155
 156         sc->lf_dev = dev;
 157         mtx_init(&sc->lf_mtx, "lpcfb", "fb", MTX_DEF);
 158
 159         rid = 0;
 160         sc->lf_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
 161             RF_ACTIVE);
 162         if (!sc->lf_mem_res) {
 163                 device_printf(dev, "cannot allocate memory window\n");
 164                 return (ENXIO);
 165         }
 166
 167         sc->lf_bst = rman_get_bustag(sc->lf_mem_res);
 168         sc->lf_bsh = rman_get_bushandle(sc->lf_mem_res);
 169
 170         rid = 0;
 171         sc->lf_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 172             RF_ACTIVE);
 173         if (!sc->lf_irq_res) {
 174                 device_printf(dev, "cannot allocate interrupt\n");
 175                 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->lf_mem_res);
 176                 return (ENXIO);
 177         }
 178
 179         if (bus_setup_intr(dev, sc->lf_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
 180             NULL, lpc_fb_intr, sc, &sc->lf_intrhand))
 181         {
 182                 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->lf_mem_res);
 183                 bus_release_resource(dev, SYS_RES_IRQ, 1, sc->lf_irq_res);
 184                 device_printf(dev, "cannot setup interrupt handler\n");
 185                 return (ENXIO);
 186         }
 187
 188         node = ofw_bus_get_node(dev);
 189
 190         err = lpc_fb_read_lcd_config(node, &sc->lf_lcd_config);
 191         if (err) {
 192                 device_printf(dev, "cannot read LCD configuration\n");
 193                 goto fail;
 194         }
 195
 196         sc->lf_buffer_size = sc->lf_lcd_config.lc_xres *
 197             sc->lf_lcd_config.lc_yres *
 198             (sc->lf_lcd_config.lc_bpp == 24 ? 3 : 2);
 199
 200         device_printf(dev, "%dx%d LCD, %d bits per pixel, %dkHz pixel clock\n",
 201             sc->lf_lcd_config.lc_xres, sc->lf_lcd_config.lc_yres,
 202             sc->lf_lcd_config.lc_bpp, sc->lf_lcd_config.lc_pixelclock / 1000);
 203
 204         err = bus_dma_tag_create(
 205             bus_get_dma_tag(sc->lf_dev),
 206             4, 0,                       /* alignment, boundary */
 207             BUS_SPACE_MAXADDR_32BIT,    /* lowaddr */
 208             BUS_SPACE_MAXADDR,          /* highaddr */
 209             NULL, NULL,                 /* filter, filterarg */
 210             sc->lf_buffer_size, 1,      /* maxsize, nsegments */
 211             sc->lf_buffer_size, 0,      /* maxsegsize, flags */
 212             NULL, NULL,                 /* lockfunc, lockarg */
 213             &sc->lf_dma_tag);
 214
 215         err = bus_dmamem_alloc(sc->lf_dma_tag, (void **)&sc->lf_buffer,
 216             0, &sc->lf_dma_map);
 217         if (err) {
 218                 device_printf(dev, "cannot allocate framebuffer\n");
 219                 goto fail;
 220         }
 221
 222         err = bus_dmamap_load(sc->lf_dma_tag, sc->lf_dma_map, sc->lf_buffer,
 223             sc->lf_buffer_size, lpc_fb_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
 224         if (err) {
 225                 device_printf(dev, "cannot load DMA map\n");
 226                 goto fail;
 227         }
 228
 229         switch (sc->lf_lcd_config.lc_bpp) {
 230         case 12:
 231                 mode = LPC_CLKPWR_LCDCLK_CTRL_MODE_12;
 232                 break;
 233         case 15:
 234                 mode = LPC_CLKPWR_LCDCLK_CTRL_MODE_15;
 235                 break;
 236         case 16:
 237                 mode = LPC_CLKPWR_LCDCLK_CTRL_MODE_16;
 238                 break;
 239         case 24:
 240                 mode = LPC_CLKPWR_LCDCLK_CTRL_MODE_24;
 241                 break;
 242         default:
 243                 panic("unsupported bpp");
 244         }
 245
 246         lpc_pwr_write(sc->lf_dev, LPC_CLKPWR_LCDCLK_CTRL,
 247             LPC_CLKPWR_LCDCLK_CTRL_MODE(mode) |
 248             LPC_CLKPWR_LCDCLK_CTRL_HCLKEN);
 249
 250         sc->lf_buffer_phys = ctx.lf_dma_busaddr;
 251         sc->lf_cdev = make_dev(&lpc_fb_cdevsw, 0, UID_ROOT, GID_WHEEL,
 252             0600, "lpcfb");
 253
 254         sc->lf_cdev->si_drv1 = sc;
 255
 256         return (0);
 257 fail:
 258         return (ENXIO);
 259 }
 260
 261 static void
 262 lpc_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
 263 {
 264         struct lpc_fb_dmamap_arg *ctx;
 265
 266         if (err)
 267                 return;
 268
 269         ctx = (struct lpc_fb_dmamap_arg *)arg;
 270         ctx->lf_dma_busaddr = segs[0].ds_addr;
 271 }
 272
 273 static void
 274 lpc_fb_intr(void *arg)
 275 {
 276 }
 277
 278 static int
 279 lpc_fb_fdt_read(phandle_t node, const char *name, uint32_t *ret)
 280 {
 281         if (OF_getprop(node, name, ret, sizeof(uint32_t)) <= 0)
 282                 return (ENOENT);
 283
 284         *ret = fdt32_to_cpu(*ret);
 285         return (0);
 286 }
 287
 288 static int
 289 lpc_fb_read_lcd_config(phandle_t node, struct lpc_lcd_config *cfg)
 290 {
 291         if (lpc_fb_fdt_read(node, "horizontal-resolution", &cfg->lc_xres))
 292                 return (ENXIO);
 293
 294         if (lpc_fb_fdt_read(node, "vertical-resolution", &cfg->lc_yres))
 295                 return (ENXIO);
 296
 297         if (lpc_fb_fdt_read(node, "bits-per-pixel", &cfg->lc_bpp))
 298                 return (ENXIO);
 299
 300         if (lpc_fb_fdt_read(node, "pixel-clock", &cfg->lc_pixelclock))
 301                 return (ENXIO);
 302
 303         if (lpc_fb_fdt_read(node, "left-margin", &cfg->lc_left_margin))
 304                 return (ENXIO);
 305
 306         if (lpc_fb_fdt_read(node, "right-margin", &cfg->lc_right_margin))
 307                 return (ENXIO);
 308
 309         if (lpc_fb_fdt_read(node, "upper-margin", &cfg->lc_upper_margin))
 310                 return (ENXIO);
 311
 312         if (lpc_fb_fdt_read(node, "lower-margin", &cfg->lc_lower_margin))
 313                 return (ENXIO);
 314
 315         if (lpc_fb_fdt_read(node, "hsync-len", &cfg->lc_hsync_len))
 316                 return (ENXIO);
 317
 318         if (lpc_fb_fdt_read(node, "vsync-len", &cfg->lc_vsync_len))
 319                 return (ENXIO);
 320
 321         return (0);
 322 }
 323
 324 static void
 325 lpc_fb_setup(struct lpc_fb_softc *sc)
 326 {
 327         struct lpc_lcd_config *cfg = &sc->lf_lcd_config;
 328         uint32_t bpp;
 329
 330         lpc_fb_write_4(sc, LPC_LCD_TIMH,
 331             LPC_LCD_TIMH_PPL(cfg->lc_xres) |
 332             LPC_LCD_TIMH_HSW(cfg->lc_hsync_len - 1) |
 333             LPC_LCD_TIMH_HFP(cfg->lc_right_margin - 1) |
 334             LPC_LCD_TIMH_HBP(cfg->lc_left_margin - 1));
 335
 336         lpc_fb_write_4(sc, LPC_LCD_TIMV,
 337             LPC_LCD_TIMV_LPP(cfg->lc_yres - 1) |
 338             LPC_LCD_TIMV_VSW(cfg->lc_vsync_len - 1) |
 339             LPC_LCD_TIMV_VFP(cfg->lc_lower_margin) |
 340             LPC_LCD_TIMV_VBP(cfg->lc_upper_margin));
 341
 342         /* XXX LPC_LCD_POL_PCD_LO */
 343         lpc_fb_write_4(sc, LPC_LCD_POL,
 344             LPC_LCD_POL_IHS | LPC_LCD_POL_IVS |
 345             LPC_LCD_POL_CPL(cfg->lc_xres - 1) |
 346             LPC_LCD_POL_PCD_LO(4));
 347
 348         lpc_fb_write_4(sc, LPC_LCD_UPBASE, sc->lf_buffer_phys);
 349
 350         switch (cfg->lc_bpp) {
 351         case 1:
 352                 bpp = LPC_LCD_CTRL_BPP1;
 353                 break;
 354         case 2:
 355                 bpp = LPC_LCD_CTRL_BPP2;
 356                 break;
 357         case 4:
 358                 bpp = LPC_LCD_CTRL_BPP4;
 359                 break;
 360         case 8:
 361                 bpp = LPC_LCD_CTRL_BPP8;
 362                 break;
 363         case 12:
 364                 bpp = LPC_LCD_CTRL_BPP12_444;
 365                 break;
 366         case 15:
 367                 bpp = LPC_LCD_CTRL_BPP16;
 368                 break;
 369         case 16:
 370                 bpp = LPC_LCD_CTRL_BPP16_565;
 371                 break;
 372         case 24:
 373                 bpp = LPC_LCD_CTRL_BPP24;
 374                 break;
 375         default:
 376                 panic("LCD unknown bpp: %d", cfg->lc_bpp);
 377         }
 378
 379         lpc_fb_write_4(sc, LPC_LCD_CTRL,
 380             LPC_LCD_CTRL_LCDVCOMP(1) |
 381             LPC_LCD_CTRL_LCDPWR |
 382             LPC_LCD_CTRL_BGR |
 383             LPC_LCD_CTRL_LCDTFT |
 384             LPC_LCD_CTRL_LCDBPP(bpp) |
 385             LPC_LCD_CTRL_LCDEN);
 386 }
 387
 388
 389 static int
 390 lpc_fb_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
 391 {
 392         struct lpc_fb_softc *sc = cdev->si_drv1;
 393
 394         lpc_fb_lock(sc);
 395
 396         if (sc->lf_opened)
 397                 return (EBUSY);
 398
 399         sc->lf_opened = 1;
 400
 401         lpc_fb_unlock(sc);
 402
 403         if (!sc->lf_initialized) {
 404                 ssd1289_configure();
 405                 lpc_fb_setup(sc);
 406                 lpc_fb_blank(sc);
 407                 sc->lf_initialized = 1;
 408         }
 409
 410         return (0);
 411 }
 412
 413 static int
 414 lpc_fb_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
 415 {
 416         struct lpc_fb_softc *sc = cdev->si_drv1;
 417
 418         lpc_fb_lock(sc);
 419         sc->lf_opened = 0;
 420         lpc_fb_unlock(sc);
 421
 422         return (0);
 423 }
 424
 425 static int
 426 lpc_fb_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int x,
 427     struct thread *td)
 428 {
 429
 430         return (EINVAL);
 431 }
 432
 433 static int
 434 lpc_fb_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
 435     int nprot, vm_memattr_t *memattr)
 436 {
 437         struct lpc_fb_softc *sc = cdev->si_drv1;
 438
 439         *paddr = (vm_paddr_t)(sc->lf_buffer_phys + offset);
 440         return (0);
 441 }
 442
 443 static void
 444 lpc_fb_blank(struct lpc_fb_softc *sc)
 445 {
 446         memset(sc->lf_buffer, 0xffff, sc->lf_buffer_size);
 447 }
 448
 449 static device_method_t lpc_fb_methods[] = {
 450         /* Device interface */
 451         DEVMETHOD(device_probe,         lpc_fb_probe),
 452         DEVMETHOD(device_attach,        lpc_fb_attach),
 453
 454         { 0, 0 }
 455 };
 456
 457 static devclass_t lpc_fb_devclass;
 458
 459 static driver_t lpc_fb_driver = {
 460         "lpcfb",
 461         lpc_fb_methods,
 462         sizeof(struct lpc_fb_softc),
 463 };
 464
 465 DRIVER_MODULE(lpcfb, simplebus, lpc_fb_driver, lpc_fb_devclass, 0, 0);