arch/powerpc/sysdev/cpm2_common.c

   1 /*
   2  * General Purpose functions for the global management of the
   3  * 8260 Communication Processor Module.
   4  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
   5  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
   6  *      2.3.99 Updates
   7  *
   8  * 2006 (c) MontaVista Software, Inc.
   9  * Vitaly Bordug <vbordug@ru.mvista.com>
  10  *      Merged to arch/powerpc from arch/ppc/syslib/cpm2_common.c
  11  *
  12  * This file is licensed under the terms of the GNU General Public License
  13  * version 2. This program is licensed "as is" without any warranty of any
  14  * kind, whether express or implied.
  15  */
  16
  17 /*
  18  *
  19  * In addition to the individual control of the communication
  20  * channels, there are a few functions that globally affect the
  21  * communication processor.
  22  *
  23  * Buffer descriptors must be allocated from the dual ported memory
  24  * space.  The allocator for that is here.  When the communication
  25  * process is reset, we reclaim the memory available.  There is
  26  * currently no deallocator for this memory.
  27  */
  28 #include <linux/errno.h>
  29 #include <linux/sched.h>
  30 #include <linux/kernel.h>
  31 #include <linux/param.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/module.h>
  36 #include <linux/of.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/mpc8260.h>
  41 #include <asm/page.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/cpm2.h>
  44 #include <asm/rheap.h>
  45 #include <asm/fs_pd.h>
  46
  47 #include <sysdev/fsl_soc.h>
  48
  49 #ifndef CONFIG_PPC_CPM_NEW_BINDING
  50 static void cpm2_dpinit(void);
  51 #endif
  52
  53 cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */
  54
  55 /* We allocate this here because it is used almost exclusively for
  56  * the communication processor devices.
  57  */
  58 cpm2_map_t __iomem *cpm2_immr;
  59
  60 #define CPM_MAP_SIZE    (0x40000)       /* 256k - the PQ3 reserve this amount
  61                                            of space for CPM as it is larger
  62                                            than on PQ2 */
  63
  64 void
  65 cpm2_reset(void)
  66 {
  67 #ifdef CONFIG_PPC_85xx
  68         cpm2_immr = ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
  69 #else
  70         cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE);
  71 #endif
  72
  73         /* Reclaim the DP memory for our use.
  74          */
  75 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  76         cpm_muram_init();
  77 #else
  78         cpm2_dpinit();
  79 #endif
  80
  81         /* Tell everyone where the comm processor resides.
  82          */
  83         cpmp = &cpm2_immr->im_cpm;
  84 }
  85
  86 /* Set a baud rate generator.  This needs lots of work.  There are
  87  * eight BRGs, which can be connected to the CPM channels or output
  88  * as clocks.  The BRGs are in two different block of internal
  89  * memory mapped space.
  90  * The baud rate clock is the system clock divided by something.
  91  * It was set up long ago during the initial boot phase and is
  92  * is given to us.
  93  * Baud rate clocks are zero-based in the driver code (as that maps
  94  * to port numbers).  Documentation uses 1-based numbering.
  95  */
  96 #define BRG_INT_CLK     (get_brgfreq())
  97 #define BRG_UART_CLK    (BRG_INT_CLK/16)
  98
  99 /* This function is used by UARTS, or anything else that uses a 16x
 100  * oversampled clock.
 101  */
 102 void
 103 cpm_setbrg(uint brg, uint rate)
 104 {
 105         u32 __iomem *bp;
 106
 107         /* This is good enough to get SMCs running.....
 108         */
 109         if (brg < 4) {
 110                 bp = cpm2_map_size(im_brgc1, 16);
 111         } else {
 112                 bp = cpm2_map_size(im_brgc5, 16);
 113                 brg -= 4;
 114         }
 115         bp += brg;
 116         out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
 117
 118         cpm2_unmap(bp);
 119 }
 120
 121 /* This function is used to set high speed synchronous baud rate
 122  * clocks.
 123  */
 124 void
 125 cpm2_fastbrg(uint brg, uint rate, int div16)
 126 {
 127         u32 __iomem *bp;
 128         u32 val;
 129
 130         if (brg < 4) {
 131                 bp = cpm2_map_size(im_brgc1, 16);
 132         }
 133         else {
 134                 bp = cpm2_map_size(im_brgc5, 16);
 135                 brg -= 4;
 136         }
 137         bp += brg;
 138         val = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
 139         if (div16)
 140                 val |= CPM_BRG_DIV16;
 141
 142         out_be32(bp, val);
 143         cpm2_unmap(bp);
 144 }
 145
 146 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 147 {
 148         int ret = 0;
 149         int shift;
 150         int i, bits = 0;
 151         cpmux_t __iomem *im_cpmux;
 152         u32 __iomem *reg;
 153         u32 mask = 7;
 154
 155         u8 clk_map[][3] = {
 156                 {CPM_CLK_FCC1, CPM_BRG5, 0},
 157                 {CPM_CLK_FCC1, CPM_BRG6, 1},
 158                 {CPM_CLK_FCC1, CPM_BRG7, 2},
 159                 {CPM_CLK_FCC1, CPM_BRG8, 3},
 160                 {CPM_CLK_FCC1, CPM_CLK9, 4},
 161                 {CPM_CLK_FCC1, CPM_CLK10, 5},
 162                 {CPM_CLK_FCC1, CPM_CLK11, 6},
 163                 {CPM_CLK_FCC1, CPM_CLK12, 7},
 164                 {CPM_CLK_FCC2, CPM_BRG5, 0},
 165                 {CPM_CLK_FCC2, CPM_BRG6, 1},
 166                 {CPM_CLK_FCC2, CPM_BRG7, 2},
 167                 {CPM_CLK_FCC2, CPM_BRG8, 3},
 168                 {CPM_CLK_FCC2, CPM_CLK13, 4},
 169                 {CPM_CLK_FCC2, CPM_CLK14, 5},
 170                 {CPM_CLK_FCC2, CPM_CLK15, 6},
 171                 {CPM_CLK_FCC2, CPM_CLK16, 7},
 172                 {CPM_CLK_FCC3, CPM_BRG5, 0},
 173                 {CPM_CLK_FCC3, CPM_BRG6, 1},
 174                 {CPM_CLK_FCC3, CPM_BRG7, 2},
 175                 {CPM_CLK_FCC3, CPM_BRG8, 3},
 176                 {CPM_CLK_FCC3, CPM_CLK13, 4},
 177                 {CPM_CLK_FCC3, CPM_CLK14, 5},
 178                 {CPM_CLK_FCC3, CPM_CLK15, 6},
 179                 {CPM_CLK_FCC3, CPM_CLK16, 7},
 180                 {CPM_CLK_SCC1, CPM_BRG1, 0},
 181                 {CPM_CLK_SCC1, CPM_BRG2, 1},
 182                 {CPM_CLK_SCC1, CPM_BRG3, 2},
 183                 {CPM_CLK_SCC1, CPM_BRG4, 3},
 184                 {CPM_CLK_SCC1, CPM_CLK11, 4},
 185                 {CPM_CLK_SCC1, CPM_CLK12, 5},
 186                 {CPM_CLK_SCC1, CPM_CLK3, 6},
 187                 {CPM_CLK_SCC1, CPM_CLK4, 7},
 188                 {CPM_CLK_SCC2, CPM_BRG1, 0},
 189                 {CPM_CLK_SCC2, CPM_BRG2, 1},
 190                 {CPM_CLK_SCC2, CPM_BRG3, 2},
 191                 {CPM_CLK_SCC2, CPM_BRG4, 3},
 192                 {CPM_CLK_SCC2, CPM_CLK11, 4},
 193                 {CPM_CLK_SCC2, CPM_CLK12, 5},
 194                 {CPM_CLK_SCC2, CPM_CLK3, 6},
 195                 {CPM_CLK_SCC2, CPM_CLK4, 7},
 196                 {CPM_CLK_SCC3, CPM_BRG1, 0},
 197                 {CPM_CLK_SCC3, CPM_BRG2, 1},
 198                 {CPM_CLK_SCC3, CPM_BRG3, 2},
 199                 {CPM_CLK_SCC3, CPM_BRG4, 3},
 200                 {CPM_CLK_SCC3, CPM_CLK5, 4},
 201                 {CPM_CLK_SCC3, CPM_CLK6, 5},
 202                 {CPM_CLK_SCC3, CPM_CLK7, 6},
 203                 {CPM_CLK_SCC3, CPM_CLK8, 7},
 204                 {CPM_CLK_SCC4, CPM_BRG1, 0},
 205                 {CPM_CLK_SCC4, CPM_BRG2, 1},
 206                 {CPM_CLK_SCC4, CPM_BRG3, 2},
 207                 {CPM_CLK_SCC4, CPM_BRG4, 3},
 208                 {CPM_CLK_SCC4, CPM_CLK5, 4},
 209                 {CPM_CLK_SCC4, CPM_CLK6, 5},
 210                 {CPM_CLK_SCC4, CPM_CLK7, 6},
 211                 {CPM_CLK_SCC4, CPM_CLK8, 7},
 212         };
 213
 214         im_cpmux = cpm2_map(im_cpmux);
 215
 216         switch (target) {
 217         case CPM_CLK_SCC1:
 218                 reg = &im_cpmux->cmx_scr;
 219                 shift = 24;
 220         case CPM_CLK_SCC2:
 221                 reg = &im_cpmux->cmx_scr;
 222                 shift = 16;
 223                 break;
 224         case CPM_CLK_SCC3:
 225                 reg = &im_cpmux->cmx_scr;
 226                 shift = 8;
 227                 break;
 228         case CPM_CLK_SCC4:
 229                 reg = &im_cpmux->cmx_scr;
 230                 shift = 0;
 231                 break;
 232         case CPM_CLK_FCC1:
 233                 reg = &im_cpmux->cmx_fcr;
 234                 shift = 24;
 235                 break;
 236         case CPM_CLK_FCC2:
 237                 reg = &im_cpmux->cmx_fcr;
 238                 shift = 16;
 239                 break;
 240         case CPM_CLK_FCC3:
 241                 reg = &im_cpmux->cmx_fcr;
 242                 shift = 8;
 243                 break;
 244         default:
 245                 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 246                 return -EINVAL;
 247         }
 248
 249         if (mode == CPM_CLK_RX)
 250                 shift += 3;
 251
 252         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 253                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 254                         bits = clk_map[i][2];
 255                         break;
 256                 }
 257         }
 258         if (i == ARRAY_SIZE(clk_map))
 259             ret = -EINVAL;
 260
 261         bits <<= shift;
 262         mask <<= shift;
 263
 264         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 265
 266         cpm2_unmap(im_cpmux);
 267         return ret;
 268 }
 269
 270 int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
 271 {
 272         int ret = 0;
 273         int shift;
 274         int i, bits = 0;
 275         cpmux_t __iomem *im_cpmux;
 276         u8 __iomem *reg;
 277         u8 mask = 3;
 278
 279         u8 clk_map[][3] = {
 280                 {CPM_CLK_SMC1, CPM_BRG1, 0},
 281                 {CPM_CLK_SMC1, CPM_BRG7, 1},
 282                 {CPM_CLK_SMC1, CPM_CLK7, 2},
 283                 {CPM_CLK_SMC1, CPM_CLK9, 3},
 284                 {CPM_CLK_SMC2, CPM_BRG2, 0},
 285                 {CPM_CLK_SMC2, CPM_BRG8, 1},
 286                 {CPM_CLK_SMC2, CPM_CLK4, 2},
 287                 {CPM_CLK_SMC2, CPM_CLK15, 3},
 288         };
 289
 290         im_cpmux = cpm2_map(im_cpmux);
 291
 292         switch (target) {
 293         case CPM_CLK_SMC1:
 294                 reg = &im_cpmux->cmx_smr;
 295                 mask = 3;
 296                 shift = 4;
 297                 break;
 298         case CPM_CLK_SMC2:
 299                 reg = &im_cpmux->cmx_smr;
 300                 mask = 3;
 301                 shift = 0;
 302                 break;
 303         default:
 304                 printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
 305                 return -EINVAL;
 306         }
 307
 308         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 309                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 310                         bits = clk_map[i][2];
 311                         break;
 312                 }
 313         }
 314         if (i == ARRAY_SIZE(clk_map))
 315             ret = -EINVAL;
 316
 317         bits <<= shift;
 318         mask <<= shift;
 319
 320         out_8(reg, (in_8(reg) & ~mask) | bits);
 321
 322         cpm2_unmap(im_cpmux);
 323         return ret;
 324 }
 325
 326 #ifndef CONFIG_PPC_CPM_NEW_BINDING
 327 /*
 328  * dpalloc / dpfree bits.
 329  */
 330 static spinlock_t cpm_dpmem_lock;
 331 /* 16 blocks should be enough to satisfy all requests
 332  * until the memory subsystem goes up... */
 333 static rh_block_t cpm_boot_dpmem_rh_block[16];
 334 static rh_info_t cpm_dpmem_info;
 335 static u8 __iomem *im_dprambase;
 336
 337 static void cpm2_dpinit(void)
 338 {
 339         spin_lock_init(&cpm_dpmem_lock);
 340
 341         /* initialize the info header */
 342         rh_init(&cpm_dpmem_info, 1,
 343                         sizeof(cpm_boot_dpmem_rh_block) /
 344                         sizeof(cpm_boot_dpmem_rh_block[0]),
 345                         cpm_boot_dpmem_rh_block);
 346
 347         im_dprambase = cpm2_immr;
 348
 349         /* Attach the usable dpmem area */
 350         /* XXX: This is actually crap. CPM_DATAONLY_BASE and
 351          * CPM_DATAONLY_SIZE is only a subset of the available dpram. It
 352          * varies with the processor and the microcode patches activated.
 353          * But the following should be at least safe.
 354          */
 355         rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 356 }
 357
 358 /* This function returns an index into the DPRAM area.
 359  */
 360 unsigned long cpm_dpalloc(uint size, uint align)
 361 {
 362         unsigned long start;
 363         unsigned long flags;
 364
 365         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 366         cpm_dpmem_info.alignment = align;
 367         start = rh_alloc(&cpm_dpmem_info, size, "commproc");
 368         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 369
 370         return (uint)start;
 371 }
 372 EXPORT_SYMBOL(cpm_dpalloc);
 373
 374 int cpm_dpfree(unsigned long offset)
 375 {
 376         int ret;
 377         unsigned long flags;
 378
 379         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 380         ret = rh_free(&cpm_dpmem_info, offset);
 381         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 382
 383         return ret;
 384 }
 385 EXPORT_SYMBOL(cpm_dpfree);
 386
 387 /* not sure if this is ever needed */
 388 unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 389 {
 390         unsigned long start;
 391         unsigned long flags;
 392
 393         spin_lock_irqsave(&cpm_dpmem_lock, flags);
 394         cpm_dpmem_info.alignment = align;
 395         start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 396         spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 397
 398         return start;
 399 }
 400 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 401
 402 void cpm_dpdump(void)
 403 {
 404         rh_dump(&cpm_dpmem_info);
 405 }
 406 EXPORT_SYMBOL(cpm_dpdump);
 407
 408 void *cpm_dpram_addr(unsigned long offset)
 409 {
 410         return (void *)(im_dprambase + offset);
 411 }
 412 EXPORT_SYMBOL(cpm_dpram_addr);
 413 #endif /* !CONFIG_PPC_CPM_NEW_BINDING */
 414
 415 struct cpm2_ioports {
 416         u32 dir, par, sor, odr, dat;
 417         u32 res[3];
 418 };
 419
 420 void cpm2_set_pin(int port, int pin, int flags)
 421 {
 422         struct cpm2_ioports __iomem *iop =
 423                 (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
 424
 425         pin = 1 << (31 - pin);
 426
 427         if (flags & CPM_PIN_OUTPUT)
 428                 setbits32(&iop[port].dir, pin);
 429         else
 430                 clrbits32(&iop[port].dir, pin);
 431
 432         if (!(flags & CPM_PIN_GPIO))
 433                 setbits32(&iop[port].par, pin);
 434         else
 435                 clrbits32(&iop[port].par, pin);
 436
 437         if (flags & CPM_PIN_SECONDARY)
 438                 setbits32(&iop[port].sor, pin);
 439         else
 440                 clrbits32(&iop[port].sor, pin);
 441
 442         if (flags & CPM_PIN_OPENDRAIN)
 443                 setbits32(&iop[port].odr, pin);
 444         else
 445                 clrbits32(&iop[port].odr, pin);
 446 }