arch/powerpc/platforms/512x/mpc512x_shared.c

   1 /*
   2  * Copyright (C) 2007,2008 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author: John Rigby <jrigby@freescale.com>
   5  *
   6  * Description:
   7  * MPC512x Shared code
   8  *
   9  * This is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/fsl-diu-fb.h>
  20 #include <linux/bootmem.h>
  21 #include <sysdev/fsl_soc.h>
  22
  23 #include <asm/cacheflush.h>
  24 #include <asm/machdep.h>
  25 #include <asm/ipic.h>
  26 #include <asm/prom.h>
  27 #include <asm/time.h>
  28 #include <asm/mpc5121.h>
  29 #include <asm/mpc52xx_psc.h>
  30
  31 #include "mpc512x.h"
  32
  33 static struct mpc512x_reset_module __iomem *reset_module_base;
  34
  35 static void __init mpc512x_restart_init(void)
  36 {
  37         struct device_node *np;
  38
  39         np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
  40         if (!np)
  41                 return;
  42
  43         reset_module_base = of_iomap(np, 0);
  44         of_node_put(np);
  45 }
  46
  47 void mpc512x_restart(char *cmd)
  48 {
  49         if (reset_module_base) {
  50                 /* Enable software reset "RSTE" */
  51                 out_be32(&reset_module_base->rpr, 0x52535445);
  52                 /* Set software hard reset */
  53                 out_be32(&reset_module_base->rcr, 0x2);
  54         } else {
  55                 pr_err("Restart module not mapped.\n");
  56         }
  57         for (;;)
  58                 ;
  59 }
  60
  61 struct fsl_diu_shared_fb {
  62         u8              gamma[0x300];   /* 32-bit aligned! */
  63         struct diu_ad   ad0;            /* 32-bit aligned! */
  64         phys_addr_t     fb_phys;
  65         size_t          fb_len;
  66         bool            in_use;
  67 };
  68
  69 u32 mpc512x_get_pixel_format(enum fsl_diu_monitor_port port,
  70                              unsigned int bits_per_pixel)
  71 {
  72         switch (bits_per_pixel) {
  73         case 32:
  74                 return 0x88883316;
  75         case 24:
  76                 return 0x88082219;
  77         case 16:
  78                 return 0x65053118;
  79         }
  80         return 0x00000400;
  81 }
  82
  83 void mpc512x_set_gamma_table(enum fsl_diu_monitor_port port,
  84                              char *gamma_table_base)
  85 {
  86 }
  87
  88 void mpc512x_set_monitor_port(enum fsl_diu_monitor_port port)
  89 {
  90 }
  91
  92 #define DIU_DIV_MASK    0x000000ff
  93 void mpc512x_set_pixel_clock(unsigned int pixclock)
  94 {
  95         unsigned long bestval, bestfreq, speed, busfreq;
  96         unsigned long minpixclock, maxpixclock, pixval;
  97         struct mpc512x_ccm __iomem *ccm;
  98         struct device_node *np;
  99         u32 temp;
 100         long err;
 101         int i;
 102
 103         np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
 104         if (!np) {
 105                 pr_err("Can't find clock control module.\n");
 106                 return;
 107         }
 108
 109         ccm = of_iomap(np, 0);
 110         of_node_put(np);
 111         if (!ccm) {
 112                 pr_err("Can't map clock control module reg.\n");
 113                 return;
 114         }
 115
 116         np = of_find_node_by_type(NULL, "cpu");
 117         if (np) {
 118                 const unsigned int *prop =
 119                         of_get_property(np, "bus-frequency", NULL);
 120
 121                 of_node_put(np);
 122                 if (prop) {
 123                         busfreq = *prop;
 124                 } else {
 125                         pr_err("Can't get bus-frequency property\n");
 126                         return;
 127                 }
 128         } else {
 129                 pr_err("Can't find 'cpu' node.\n");
 130                 return;
 131         }
 132
 133         /* Pixel Clock configuration */
 134         pr_debug("DIU: Bus Frequency = %lu\n", busfreq);
 135         speed = busfreq * 4; /* DIU_DIV ratio is 4 * CSB_CLK / DIU_CLK */
 136
 137         /* Calculate the pixel clock with the smallest error */
 138         /* calculate the following in steps to avoid overflow */
 139         pr_debug("DIU pixclock in ps - %d\n", pixclock);
 140         temp = (1000000000 / pixclock) * 1000;
 141         pixclock = temp;
 142         pr_debug("DIU pixclock freq - %u\n", pixclock);
 143
 144         temp = temp / 20; /* pixclock * 0.05 */
 145         pr_debug("deviation = %d\n", temp);
 146         minpixclock = pixclock - temp;
 147         maxpixclock = pixclock + temp;
 148         pr_debug("DIU minpixclock - %lu\n", minpixclock);
 149         pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
 150         pixval = speed/pixclock;
 151         pr_debug("DIU pixval = %lu\n", pixval);
 152
 153         err = LONG_MAX;
 154         bestval = pixval;
 155         pr_debug("DIU bestval = %lu\n", bestval);
 156
 157         bestfreq = 0;
 158         for (i = -1; i <= 1; i++) {
 159                 temp = speed / (pixval+i);
 160                 pr_debug("DIU test pixval i=%d, pixval=%lu, temp freq. = %u\n",
 161                         i, pixval, temp);
 162                 if ((temp < minpixclock) || (temp > maxpixclock))
 163                         pr_debug("DIU exceeds monitor range (%lu to %lu)\n",
 164                                 minpixclock, maxpixclock);
 165                 else if (abs(temp - pixclock) < err) {
 166                         pr_debug("Entered the else if block %d\n", i);
 167                         err = abs(temp - pixclock);
 168                         bestval = pixval + i;
 169                         bestfreq = temp;
 170                 }
 171         }
 172
 173         pr_debug("DIU chose = %lx\n", bestval);
 174         pr_debug("DIU error = %ld\n NomPixClk ", err);
 175         pr_debug("DIU: Best Freq = %lx\n", bestfreq);
 176         /* Modify DIU_DIV in CCM SCFR1 */
 177         temp = in_be32(&ccm->scfr1);
 178         pr_debug("DIU: Current value of SCFR1: 0x%08x\n", temp);
 179         temp &= ~DIU_DIV_MASK;
 180         temp |= (bestval & DIU_DIV_MASK);
 181         out_be32(&ccm->scfr1, temp);
 182         pr_debug("DIU: Modified value of SCFR1: 0x%08x\n", temp);
 183         iounmap(ccm);
 184 }
 185
 186 enum fsl_diu_monitor_port
 187 mpc512x_valid_monitor_port(enum fsl_diu_monitor_port port)
 188 {
 189         return FSL_DIU_PORT_DVI;
 190 }
 191
 192 static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
 193
 194 #if defined(CONFIG_FB_FSL_DIU) || \
 195     defined(CONFIG_FB_FSL_DIU_MODULE)
 196 static inline void mpc512x_free_bootmem(struct page *page)
 197 {
 198         __ClearPageReserved(page);
 199         BUG_ON(PageTail(page));
 200         BUG_ON(atomic_read(&page->_count) > 1);
 201         atomic_set(&page->_count, 1);
 202         __free_page(page);
 203         totalram_pages++;
 204 }
 205
 206 void mpc512x_release_bootmem(void)
 207 {
 208         unsigned long addr = diu_shared_fb.fb_phys & PAGE_MASK;
 209         unsigned long size = diu_shared_fb.fb_len;
 210         unsigned long start, end;
 211
 212         if (diu_shared_fb.in_use) {
 213                 start = PFN_UP(addr);
 214                 end = PFN_DOWN(addr + size);
 215
 216                 for (; start < end; start++)
 217                         mpc512x_free_bootmem(pfn_to_page(start));
 218
 219                 diu_shared_fb.in_use = false;
 220         }
 221         diu_ops.release_bootmem = NULL;
 222 }
 223 #endif
 224
 225 /*
 226  * Check if DIU was pre-initialized. If so, perform steps
 227  * needed to continue displaying through the whole boot process.
 228  * Move area descriptor and gamma table elsewhere, they are
 229  * destroyed by bootmem allocator otherwise. The frame buffer
 230  * address range will be reserved in setup_arch() after bootmem
 231  * allocator is up.
 232  */
 233 void __init mpc512x_init_diu(void)
 234 {
 235         struct device_node *np;
 236         struct diu __iomem *diu_reg;
 237         phys_addr_t desc;
 238         void __iomem *vaddr;
 239         unsigned long mode, pix_fmt, res, bpp;
 240         unsigned long dst;
 241
 242         np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
 243         if (!np) {
 244                 pr_err("No DIU node\n");
 245                 return;
 246         }
 247
 248         diu_reg = of_iomap(np, 0);
 249         of_node_put(np);
 250         if (!diu_reg) {
 251                 pr_err("Can't map DIU\n");
 252                 return;
 253         }
 254
 255         mode = in_be32(&diu_reg->diu_mode);
 256         if (mode == MFB_MODE0) {
 257                 pr_info("%s: DIU OFF\n", __func__);
 258                 goto out;
 259         }
 260
 261         desc = in_be32(&diu_reg->desc[0]);
 262         vaddr = ioremap(desc, sizeof(struct diu_ad));
 263         if (!vaddr) {
 264                 pr_err("Can't map DIU area desc.\n");
 265                 goto out;
 266         }
 267         memcpy(&diu_shared_fb.ad0, vaddr, sizeof(struct diu_ad));
 268         /* flush fb area descriptor */
 269         dst = (unsigned long)&diu_shared_fb.ad0;
 270         flush_dcache_range(dst, dst + sizeof(struct diu_ad) - 1);
 271
 272         res = in_be32(&diu_reg->disp_size);
 273         pix_fmt = in_le32(vaddr);
 274         bpp = ((pix_fmt >> 16) & 0x3) + 1;
 275         diu_shared_fb.fb_phys = in_le32(vaddr + 4);
 276         diu_shared_fb.fb_len = ((res & 0xfff0000) >> 16) * (res & 0xfff) * bpp;
 277         diu_shared_fb.in_use = true;
 278         iounmap(vaddr);
 279
 280         desc = in_be32(&diu_reg->gamma);
 281         vaddr = ioremap(desc, sizeof(diu_shared_fb.gamma));
 282         if (!vaddr) {
 283                 pr_err("Can't map DIU area desc.\n");
 284                 diu_shared_fb.in_use = false;
 285                 goto out;
 286         }
 287         memcpy(&diu_shared_fb.gamma, vaddr, sizeof(diu_shared_fb.gamma));
 288         /* flush gamma table */
 289         dst = (unsigned long)&diu_shared_fb.gamma;
 290         flush_dcache_range(dst, dst + sizeof(diu_shared_fb.gamma) - 1);
 291
 292         iounmap(vaddr);
 293         out_be32(&diu_reg->gamma, virt_to_phys(&diu_shared_fb.gamma));
 294         out_be32(&diu_reg->desc[1], 0);
 295         out_be32(&diu_reg->desc[2], 0);
 296         out_be32(&diu_reg->desc[0], virt_to_phys(&diu_shared_fb.ad0));
 297
 298 out:
 299         iounmap(diu_reg);
 300 }
 301
 302 void __init mpc512x_setup_diu(void)
 303 {
 304         int ret;
 305
 306         /*
 307          * We do not allocate and configure new area for bitmap buffer
 308          * because it would requere copying bitmap data (splash image)
 309          * and so negatively affect boot time. Instead we reserve the
 310          * already configured frame buffer area so that it won't be
 311          * destroyed. The starting address of the area to reserve and
 312          * also it's length is passed to reserve_bootmem(). It will be
 313          * freed later on first open of fbdev, when splash image is not
 314          * needed any more.
 315          */
 316         if (diu_shared_fb.in_use) {
 317                 ret = reserve_bootmem(diu_shared_fb.fb_phys,
 318                                       diu_shared_fb.fb_len,
 319                                       BOOTMEM_EXCLUSIVE);
 320                 if (ret) {
 321                         pr_err("%s: reserve bootmem failed\n", __func__);
 322                         diu_shared_fb.in_use = false;
 323                 }
 324         }
 325
 326 #if defined(CONFIG_FB_FSL_DIU) || \
 327     defined(CONFIG_FB_FSL_DIU_MODULE)
 328         diu_ops.get_pixel_format        = mpc512x_get_pixel_format;
 329         diu_ops.set_gamma_table         = mpc512x_set_gamma_table;
 330         diu_ops.set_monitor_port        = mpc512x_set_monitor_port;
 331         diu_ops.set_pixel_clock         = mpc512x_set_pixel_clock;
 332         diu_ops.valid_monitor_port      = mpc512x_valid_monitor_port;
 333         diu_ops.release_bootmem         = mpc512x_release_bootmem;
 334 #endif
 335 }
 336
 337 void __init mpc512x_init_IRQ(void)
 338 {
 339         struct device_node *np;
 340
 341         np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-ipic");
 342         if (!np)
 343                 return;
 344
 345         ipic_init(np, 0);
 346         of_node_put(np);
 347
 348         /*
 349          * Initialize the default interrupt mapping priorities,
 350          * in case the boot rom changed something on us.
 351          */
 352         ipic_set_default_priority();
 353 }
 354
 355 /*
 356  * Nodes to do bus probe on, soc and localbus
 357  */
 358 static struct of_device_id __initdata of_bus_ids[] = {
 359         { .compatible = "fsl,mpc5121-immr", },
 360         { .compatible = "fsl,mpc5121-localbus", },
 361         {},
 362 };
 363
 364 void __init mpc512x_declare_of_platform_devices(void)
 365 {
 366         struct device_node *np;
 367
 368         if (of_platform_bus_probe(NULL, of_bus_ids, NULL))
 369                 printk(KERN_ERR __FILE__ ": "
 370                         "Error while probing of_platform bus\n");
 371
 372         np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-nfc");
 373         if (np) {
 374                 of_platform_device_create(np, NULL, NULL);
 375                 of_node_put(np);
 376         }
 377 }
 378
 379 #define DEFAULT_FIFO_SIZE 16
 380
 381 static unsigned int __init get_fifo_size(struct device_node *np,
 382                                          char *prop_name)
 383 {
 384         const unsigned int *fp;
 385
 386         fp = of_get_property(np, prop_name, NULL);
 387         if (fp)
 388                 return *fp;
 389
 390         pr_warning("no %s property in %s node, defaulting to %d\n",
 391                    prop_name, np->full_name, DEFAULT_FIFO_SIZE);
 392
 393         return DEFAULT_FIFO_SIZE;
 394 }
 395
 396 #define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
 397                     ((u32)(_base) + sizeof(struct mpc52xx_psc)))
 398
 399 /* Init PSC FIFO space for TX and RX slices */
 400 void __init mpc512x_psc_fifo_init(void)
 401 {
 402         struct device_node *np;
 403         void __iomem *psc;
 404         unsigned int tx_fifo_size;
 405         unsigned int rx_fifo_size;
 406         int fifobase = 0; /* current fifo address in 32 bit words */
 407
 408         for_each_compatible_node(np, NULL, "fsl,mpc5121-psc") {
 409                 tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
 410                 rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
 411
 412                 /* size in register is in 4 byte units */
 413                 tx_fifo_size /= 4;
 414                 rx_fifo_size /= 4;
 415                 if (!tx_fifo_size)
 416                         tx_fifo_size = 1;
 417                 if (!rx_fifo_size)
 418                         rx_fifo_size = 1;
 419
 420                 psc = of_iomap(np, 0);
 421                 if (!psc) {
 422                         pr_err("%s: Can't map %s device\n",
 423                                 __func__, np->full_name);
 424                         continue;
 425                 }
 426
 427                 /* FIFO space is 4KiB, check if requested size is available */
 428                 if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
 429                         pr_err("%s: no fifo space available for %s\n",
 430                                 __func__, np->full_name);
 431                         iounmap(psc);
 432                         /*
 433                          * chances are that another device requests less
 434                          * fifo space, so we continue.
 435                          */
 436                         continue;
 437                 }
 438
 439                 /* set tx and rx fifo size registers */
 440                 out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
 441                 fifobase += tx_fifo_size;
 442                 out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
 443                 fifobase += rx_fifo_size;
 444
 445                 /* reset and enable the slices */
 446                 out_be32(&FIFOC(psc)->txcmd, 0x80);
 447                 out_be32(&FIFOC(psc)->txcmd, 0x01);
 448                 out_be32(&FIFOC(psc)->rxcmd, 0x80);
 449                 out_be32(&FIFOC(psc)->rxcmd, 0x01);
 450
 451                 iounmap(psc);
 452         }
 453 }
 454
 455 void __init mpc512x_init(void)
 456 {
 457         mpc512x_declare_of_platform_devices();
 458         mpc5121_clk_init();
 459         mpc512x_restart_init();
 460         mpc512x_psc_fifo_init();
 461 }