arch/powerpc/sysdev/cpm2.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 cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */
  50
  51 /* We allocate this here because it is used almost exclusively for
  52  * the communication processor devices.
  53  */
  54 cpm2_map_t __iomem *cpm2_immr;
  55
  56 #define CPM_MAP_SIZE    (0x40000)       /* 256k - the PQ3 reserve this amount
  57                                            of space for CPM as it is larger
  58                                            than on PQ2 */
  59
  60 void __init cpm2_reset(void)
  61 {
  62 #ifdef CONFIG_PPC_85xx
  63         cpm2_immr = ioremap(CPM_MAP_ADDR, CPM_MAP_SIZE);
  64 #else
  65         cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE);
  66 #endif
  67
  68         /* Reclaim the DP memory for our use.
  69          */
  70         cpm_muram_init();
  71
  72         /* Tell everyone where the comm processor resides.
  73          */
  74         cpmp = &cpm2_immr->im_cpm;
  75
  76 #ifndef CONFIG_PPC_EARLY_DEBUG_CPM
  77         /* Reset the CPM.
  78          */
  79         cpm_command(CPM_CR_RST, 0);
  80 #endif
  81 }
  82
  83 static DEFINE_SPINLOCK(cmd_lock);
  84
  85 #define MAX_CR_CMD_LOOPS        10000
  86
  87 int cpm_command(u32 command, u8 opcode)
  88 {
  89         int i, ret;
  90         unsigned long flags;
  91
  92         spin_lock_irqsave(&cmd_lock, flags);
  93
  94         ret = 0;
  95         out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG);
  96         for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
  97                 if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
  98                         goto out;
  99
 100         printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
 101         ret = -EIO;
 102 out:
 103         spin_unlock_irqrestore(&cmd_lock, flags);
 104         return ret;
 105 }
 106 EXPORT_SYMBOL(cpm_command);
 107
 108 /* Set a baud rate generator.  This needs lots of work.  There are
 109  * eight BRGs, which can be connected to the CPM channels or output
 110  * as clocks.  The BRGs are in two different block of internal
 111  * memory mapped space.
 112  * The baud rate clock is the system clock divided by something.
 113  * It was set up long ago during the initial boot phase and is
 114  * is given to us.
 115  * Baud rate clocks are zero-based in the driver code (as that maps
 116  * to port numbers).  Documentation uses 1-based numbering.
 117  */
 118 #define BRG_INT_CLK     (get_brgfreq())
 119 #define BRG_UART_CLK    (BRG_INT_CLK/16)
 120
 121 /* This function is used by UARTS, or anything else that uses a 16x
 122  * oversampled clock.
 123  */
 124 void
 125 cpm_setbrg(uint brg, uint rate)
 126 {
 127         u32 __iomem *bp;
 128
 129         /* This is good enough to get SMCs running.....
 130         */
 131         if (brg < 4) {
 132                 bp = cpm2_map_size(im_brgc1, 16);
 133         } else {
 134                 bp = cpm2_map_size(im_brgc5, 16);
 135                 brg -= 4;
 136         }
 137         bp += brg;
 138         out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
 139
 140         cpm2_unmap(bp);
 141 }
 142
 143 /* This function is used to set high speed synchronous baud rate
 144  * clocks.
 145  */
 146 void
 147 cpm2_fastbrg(uint brg, uint rate, int div16)
 148 {
 149         u32 __iomem *bp;
 150         u32 val;
 151
 152         if (brg < 4) {
 153                 bp = cpm2_map_size(im_brgc1, 16);
 154         } else {
 155                 bp = cpm2_map_size(im_brgc5, 16);
 156                 brg -= 4;
 157         }
 158         bp += brg;
 159         val = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
 160         if (div16)
 161                 val |= CPM_BRG_DIV16;
 162
 163         out_be32(bp, val);
 164         cpm2_unmap(bp);
 165 }
 166
 167 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 168 {
 169         int ret = 0;
 170         int shift;
 171         int i, bits = 0;
 172         cpmux_t __iomem *im_cpmux;
 173         u32 __iomem *reg;
 174         u32 mask = 7;
 175
 176         u8 clk_map[][3] = {
 177                 {CPM_CLK_FCC1, CPM_BRG5, 0},
 178                 {CPM_CLK_FCC1, CPM_BRG6, 1},
 179                 {CPM_CLK_FCC1, CPM_BRG7, 2},
 180                 {CPM_CLK_FCC1, CPM_BRG8, 3},
 181                 {CPM_CLK_FCC1, CPM_CLK9, 4},
 182                 {CPM_CLK_FCC1, CPM_CLK10, 5},
 183                 {CPM_CLK_FCC1, CPM_CLK11, 6},
 184                 {CPM_CLK_FCC1, CPM_CLK12, 7},
 185                 {CPM_CLK_FCC2, CPM_BRG5, 0},
 186                 {CPM_CLK_FCC2, CPM_BRG6, 1},
 187                 {CPM_CLK_FCC2, CPM_BRG7, 2},
 188                 {CPM_CLK_FCC2, CPM_BRG8, 3},
 189                 {CPM_CLK_FCC2, CPM_CLK13, 4},
 190                 {CPM_CLK_FCC2, CPM_CLK14, 5},
 191                 {CPM_CLK_FCC2, CPM_CLK15, 6},
 192                 {CPM_CLK_FCC2, CPM_CLK16, 7},
 193                 {CPM_CLK_FCC3, CPM_BRG5, 0},
 194                 {CPM_CLK_FCC3, CPM_BRG6, 1},
 195                 {CPM_CLK_FCC3, CPM_BRG7, 2},
 196                 {CPM_CLK_FCC3, CPM_BRG8, 3},
 197                 {CPM_CLK_FCC3, CPM_CLK13, 4},
 198                 {CPM_CLK_FCC3, CPM_CLK14, 5},
 199                 {CPM_CLK_FCC3, CPM_CLK15, 6},
 200                 {CPM_CLK_FCC3, CPM_CLK16, 7},
 201                 {CPM_CLK_SCC1, CPM_BRG1, 0},
 202                 {CPM_CLK_SCC1, CPM_BRG2, 1},
 203                 {CPM_CLK_SCC1, CPM_BRG3, 2},
 204                 {CPM_CLK_SCC1, CPM_BRG4, 3},
 205                 {CPM_CLK_SCC1, CPM_CLK11, 4},
 206                 {CPM_CLK_SCC1, CPM_CLK12, 5},
 207                 {CPM_CLK_SCC1, CPM_CLK3, 6},
 208                 {CPM_CLK_SCC1, CPM_CLK4, 7},
 209                 {CPM_CLK_SCC2, CPM_BRG1, 0},
 210                 {CPM_CLK_SCC2, CPM_BRG2, 1},
 211                 {CPM_CLK_SCC2, CPM_BRG3, 2},
 212                 {CPM_CLK_SCC2, CPM_BRG4, 3},
 213                 {CPM_CLK_SCC2, CPM_CLK11, 4},
 214                 {CPM_CLK_SCC2, CPM_CLK12, 5},
 215                 {CPM_CLK_SCC2, CPM_CLK3, 6},
 216                 {CPM_CLK_SCC2, CPM_CLK4, 7},
 217                 {CPM_CLK_SCC3, CPM_BRG1, 0},
 218                 {CPM_CLK_SCC3, CPM_BRG2, 1},
 219                 {CPM_CLK_SCC3, CPM_BRG3, 2},
 220                 {CPM_CLK_SCC3, CPM_BRG4, 3},
 221                 {CPM_CLK_SCC3, CPM_CLK5, 4},
 222                 {CPM_CLK_SCC3, CPM_CLK6, 5},
 223                 {CPM_CLK_SCC3, CPM_CLK7, 6},
 224                 {CPM_CLK_SCC3, CPM_CLK8, 7},
 225                 {CPM_CLK_SCC4, CPM_BRG1, 0},
 226                 {CPM_CLK_SCC4, CPM_BRG2, 1},
 227                 {CPM_CLK_SCC4, CPM_BRG3, 2},
 228                 {CPM_CLK_SCC4, CPM_BRG4, 3},
 229                 {CPM_CLK_SCC4, CPM_CLK5, 4},
 230                 {CPM_CLK_SCC4, CPM_CLK6, 5},
 231                 {CPM_CLK_SCC4, CPM_CLK7, 6},
 232                 {CPM_CLK_SCC4, CPM_CLK8, 7},
 233         };
 234
 235         im_cpmux = cpm2_map(im_cpmux);
 236
 237         switch (target) {
 238         case CPM_CLK_SCC1:
 239                 reg = &im_cpmux->cmx_scr;
 240                 shift = 24;
 241                 break;
 242         case CPM_CLK_SCC2:
 243                 reg = &im_cpmux->cmx_scr;
 244                 shift = 16;
 245                 break;
 246         case CPM_CLK_SCC3:
 247                 reg = &im_cpmux->cmx_scr;
 248                 shift = 8;
 249                 break;
 250         case CPM_CLK_SCC4:
 251                 reg = &im_cpmux->cmx_scr;
 252                 shift = 0;
 253                 break;
 254         case CPM_CLK_FCC1:
 255                 reg = &im_cpmux->cmx_fcr;
 256                 shift = 24;
 257                 break;
 258         case CPM_CLK_FCC2:
 259                 reg = &im_cpmux->cmx_fcr;
 260                 shift = 16;
 261                 break;
 262         case CPM_CLK_FCC3:
 263                 reg = &im_cpmux->cmx_fcr;
 264                 shift = 8;
 265                 break;
 266         default:
 267                 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 268                 return -EINVAL;
 269         }
 270
 271         if (mode == CPM_CLK_RX)
 272                 shift += 3;
 273
 274         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 275                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 276                         bits = clk_map[i][2];
 277                         break;
 278                 }
 279         }
 280         if (i == ARRAY_SIZE(clk_map))
 281             ret = -EINVAL;
 282
 283         bits <<= shift;
 284         mask <<= shift;
 285
 286         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 287
 288         cpm2_unmap(im_cpmux);
 289         return ret;
 290 }
 291
 292 int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
 293 {
 294         int ret = 0;
 295         int shift;
 296         int i, bits = 0;
 297         cpmux_t __iomem *im_cpmux;
 298         u8 __iomem *reg;
 299         u8 mask = 3;
 300
 301         u8 clk_map[][3] = {
 302                 {CPM_CLK_SMC1, CPM_BRG1, 0},
 303                 {CPM_CLK_SMC1, CPM_BRG7, 1},
 304                 {CPM_CLK_SMC1, CPM_CLK7, 2},
 305                 {CPM_CLK_SMC1, CPM_CLK9, 3},
 306                 {CPM_CLK_SMC2, CPM_BRG2, 0},
 307                 {CPM_CLK_SMC2, CPM_BRG8, 1},
 308                 {CPM_CLK_SMC2, CPM_CLK4, 2},
 309                 {CPM_CLK_SMC2, CPM_CLK15, 3},
 310         };
 311
 312         im_cpmux = cpm2_map(im_cpmux);
 313
 314         switch (target) {
 315         case CPM_CLK_SMC1:
 316                 reg = &im_cpmux->cmx_smr;
 317                 mask = 3;
 318                 shift = 4;
 319                 break;
 320         case CPM_CLK_SMC2:
 321                 reg = &im_cpmux->cmx_smr;
 322                 mask = 3;
 323                 shift = 0;
 324                 break;
 325         default:
 326                 printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
 327                 return -EINVAL;
 328         }
 329
 330         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 331                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 332                         bits = clk_map[i][2];
 333                         break;
 334                 }
 335         }
 336         if (i == ARRAY_SIZE(clk_map))
 337             ret = -EINVAL;
 338
 339         bits <<= shift;
 340         mask <<= shift;
 341
 342         out_8(reg, (in_8(reg) & ~mask) | bits);
 343
 344         cpm2_unmap(im_cpmux);
 345         return ret;
 346 }
 347
 348 struct cpm2_ioports {
 349         u32 dir, par, sor, odr, dat;
 350         u32 res[3];
 351 };
 352
 353 void cpm2_set_pin(int port, int pin, int flags)
 354 {
 355         struct cpm2_ioports __iomem *iop =
 356                 (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
 357
 358         pin = 1 << (31 - pin);
 359
 360         if (flags & CPM_PIN_OUTPUT)
 361                 setbits32(&iop[port].dir, pin);
 362         else
 363                 clrbits32(&iop[port].dir, pin);
 364
 365         if (!(flags & CPM_PIN_GPIO))
 366                 setbits32(&iop[port].par, pin);
 367         else
 368                 clrbits32(&iop[port].par, pin);
 369
 370         if (flags & CPM_PIN_SECONDARY)
 371                 setbits32(&iop[port].sor, pin);
 372         else
 373                 clrbits32(&iop[port].sor, pin);
 374
 375         if (flags & CPM_PIN_OPENDRAIN)
 376                 setbits32(&iop[port].odr, pin);
 377         else
 378                 clrbits32(&iop[port].odr, pin);
 379 }