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/cpm2.h>
  43 #include <asm/rheap.h>
  44 #include <asm/fs_pd.h>
  45
  46 #include <sysdev/fsl_soc.h>
  47
  48 cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor space */
  49
  50 /* We allocate this here because it is used almost exclusively for
  51  * the communication processor devices.
  52  */
  53 cpm2_map_t __iomem *cpm2_immr;
  54 EXPORT_SYMBOL(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(get_immrbase() + 0x80000, CPM_MAP_SIZE);
  64 #else
  65         cpm2_immr = ioremap(get_immrbase(), CPM_MAP_SIZE);
  66 #endif
  67
  68         /* Tell everyone where the comm processor resides.
  69          */
  70         cpmp = &cpm2_immr->im_cpm;
  71
  72 #ifndef CONFIG_PPC_EARLY_DEBUG_CPM
  73         /* Reset the CPM.
  74          */
  75         cpm_command(CPM_CR_RST, 0);
  76 #endif
  77 }
  78
  79 static DEFINE_SPINLOCK(cmd_lock);
  80
  81 #define MAX_CR_CMD_LOOPS        10000
  82
  83 int cpm_command(u32 command, u8 opcode)
  84 {
  85         int i, ret;
  86         unsigned long flags;
  87
  88         spin_lock_irqsave(&cmd_lock, flags);
  89
  90         ret = 0;
  91         out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG);
  92         for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
  93                 if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
  94                         goto out;
  95
  96         printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
  97         ret = -EIO;
  98 out:
  99         spin_unlock_irqrestore(&cmd_lock, flags);
 100         return ret;
 101 }
 102 EXPORT_SYMBOL(cpm_command);
 103
 104 /* Set a baud rate generator.  This needs lots of work.  There are
 105  * eight BRGs, which can be connected to the CPM channels or output
 106  * as clocks.  The BRGs are in two different block of internal
 107  * memory mapped space.
 108  * The baud rate clock is the system clock divided by something.
 109  * It was set up long ago during the initial boot phase and is
 110  * given to us.
 111  * Baud rate clocks are zero-based in the driver code (as that maps
 112  * to port numbers).  Documentation uses 1-based numbering.
 113  */
 114 void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src)
 115 {
 116         u32 __iomem *bp;
 117         u32 val;
 118
 119         /* This is good enough to get SMCs running.....
 120         */
 121         if (brg < 4) {
 122                 bp = cpm2_map_size(im_brgc1, 16);
 123         } else {
 124                 bp = cpm2_map_size(im_brgc5, 16);
 125                 brg -= 4;
 126         }
 127         bp += brg;
 128         /* Round the clock divider to the nearest integer. */
 129         val = (((clk * 2 / rate) - 1) & ~1) | CPM_BRG_EN | src;
 130         if (div16)
 131                 val |= CPM_BRG_DIV16;
 132
 133         out_be32(bp, val);
 134         cpm2_unmap(bp);
 135 }
 136 EXPORT_SYMBOL(__cpm2_setbrg);
 137
 138 int __init cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 139 {
 140         int ret = 0;
 141         int shift;
 142         int i, bits = 0;
 143         cpmux_t __iomem *im_cpmux;
 144         u32 __iomem *reg;
 145         u32 mask = 7;
 146
 147         u8 clk_map[][3] = {
 148                 {CPM_CLK_FCC1, CPM_BRG5, 0},
 149                 {CPM_CLK_FCC1, CPM_BRG6, 1},
 150                 {CPM_CLK_FCC1, CPM_BRG7, 2},
 151                 {CPM_CLK_FCC1, CPM_BRG8, 3},
 152                 {CPM_CLK_FCC1, CPM_CLK9, 4},
 153                 {CPM_CLK_FCC1, CPM_CLK10, 5},
 154                 {CPM_CLK_FCC1, CPM_CLK11, 6},
 155                 {CPM_CLK_FCC1, CPM_CLK12, 7},
 156                 {CPM_CLK_FCC2, CPM_BRG5, 0},
 157                 {CPM_CLK_FCC2, CPM_BRG6, 1},
 158                 {CPM_CLK_FCC2, CPM_BRG7, 2},
 159                 {CPM_CLK_FCC2, CPM_BRG8, 3},
 160                 {CPM_CLK_FCC2, CPM_CLK13, 4},
 161                 {CPM_CLK_FCC2, CPM_CLK14, 5},
 162                 {CPM_CLK_FCC2, CPM_CLK15, 6},
 163                 {CPM_CLK_FCC2, CPM_CLK16, 7},
 164                 {CPM_CLK_FCC3, CPM_BRG5, 0},
 165                 {CPM_CLK_FCC3, CPM_BRG6, 1},
 166                 {CPM_CLK_FCC3, CPM_BRG7, 2},
 167                 {CPM_CLK_FCC3, CPM_BRG8, 3},
 168                 {CPM_CLK_FCC3, CPM_CLK13, 4},
 169                 {CPM_CLK_FCC3, CPM_CLK14, 5},
 170                 {CPM_CLK_FCC3, CPM_CLK15, 6},
 171                 {CPM_CLK_FCC3, CPM_CLK16, 7},
 172                 {CPM_CLK_SCC1, CPM_BRG1, 0},
 173                 {CPM_CLK_SCC1, CPM_BRG2, 1},
 174                 {CPM_CLK_SCC1, CPM_BRG3, 2},
 175                 {CPM_CLK_SCC1, CPM_BRG4, 3},
 176                 {CPM_CLK_SCC1, CPM_CLK11, 4},
 177                 {CPM_CLK_SCC1, CPM_CLK12, 5},
 178                 {CPM_CLK_SCC1, CPM_CLK3, 6},
 179                 {CPM_CLK_SCC1, CPM_CLK4, 7},
 180                 {CPM_CLK_SCC2, CPM_BRG1, 0},
 181                 {CPM_CLK_SCC2, CPM_BRG2, 1},
 182                 {CPM_CLK_SCC2, CPM_BRG3, 2},
 183                 {CPM_CLK_SCC2, CPM_BRG4, 3},
 184                 {CPM_CLK_SCC2, CPM_CLK11, 4},
 185                 {CPM_CLK_SCC2, CPM_CLK12, 5},
 186                 {CPM_CLK_SCC2, CPM_CLK3, 6},
 187                 {CPM_CLK_SCC2, CPM_CLK4, 7},
 188                 {CPM_CLK_SCC3, CPM_BRG1, 0},
 189                 {CPM_CLK_SCC3, CPM_BRG2, 1},
 190                 {CPM_CLK_SCC3, CPM_BRG3, 2},
 191                 {CPM_CLK_SCC3, CPM_BRG4, 3},
 192                 {CPM_CLK_SCC3, CPM_CLK5, 4},
 193                 {CPM_CLK_SCC3, CPM_CLK6, 5},
 194                 {CPM_CLK_SCC3, CPM_CLK7, 6},
 195                 {CPM_CLK_SCC3, CPM_CLK8, 7},
 196                 {CPM_CLK_SCC4, CPM_BRG1, 0},
 197                 {CPM_CLK_SCC4, CPM_BRG2, 1},
 198                 {CPM_CLK_SCC4, CPM_BRG3, 2},
 199                 {CPM_CLK_SCC4, CPM_BRG4, 3},
 200                 {CPM_CLK_SCC4, CPM_CLK5, 4},
 201                 {CPM_CLK_SCC4, CPM_CLK6, 5},
 202                 {CPM_CLK_SCC4, CPM_CLK7, 6},
 203                 {CPM_CLK_SCC4, CPM_CLK8, 7},
 204         };
 205
 206         im_cpmux = cpm2_map(im_cpmux);
 207
 208         switch (target) {
 209         case CPM_CLK_SCC1:
 210                 reg = &im_cpmux->cmx_scr;
 211                 shift = 24;
 212                 break;
 213         case CPM_CLK_SCC2:
 214                 reg = &im_cpmux->cmx_scr;
 215                 shift = 16;
 216                 break;
 217         case CPM_CLK_SCC3:
 218                 reg = &im_cpmux->cmx_scr;
 219                 shift = 8;
 220                 break;
 221         case CPM_CLK_SCC4:
 222                 reg = &im_cpmux->cmx_scr;
 223                 shift = 0;
 224                 break;
 225         case CPM_CLK_FCC1:
 226                 reg = &im_cpmux->cmx_fcr;
 227                 shift = 24;
 228                 break;
 229         case CPM_CLK_FCC2:
 230                 reg = &im_cpmux->cmx_fcr;
 231                 shift = 16;
 232                 break;
 233         case CPM_CLK_FCC3:
 234                 reg = &im_cpmux->cmx_fcr;
 235                 shift = 8;
 236                 break;
 237         default:
 238                 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 239                 return -EINVAL;
 240         }
 241
 242         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 243                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 244                         bits = clk_map[i][2];
 245                         break;
 246                 }
 247         }
 248         if (i == ARRAY_SIZE(clk_map))
 249             ret = -EINVAL;
 250
 251         bits <<= shift;
 252         mask <<= shift;
 253
 254         if (mode == CPM_CLK_RTX) {
 255                 bits |= bits << 3;
 256                 mask |= mask << 3;
 257         } else if (mode == CPM_CLK_RX) {
 258                 bits <<= 3;
 259                 mask <<= 3;
 260         }
 261
 262         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 263
 264         cpm2_unmap(im_cpmux);
 265         return ret;
 266 }
 267
 268 int __init cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
 269 {
 270         int ret = 0;
 271         int shift;
 272         int i, bits = 0;
 273         cpmux_t __iomem *im_cpmux;
 274         u8 __iomem *reg;
 275         u8 mask = 3;
 276
 277         u8 clk_map[][3] = {
 278                 {CPM_CLK_SMC1, CPM_BRG1, 0},
 279                 {CPM_CLK_SMC1, CPM_BRG7, 1},
 280                 {CPM_CLK_SMC1, CPM_CLK7, 2},
 281                 {CPM_CLK_SMC1, CPM_CLK9, 3},
 282                 {CPM_CLK_SMC2, CPM_BRG2, 0},
 283                 {CPM_CLK_SMC2, CPM_BRG8, 1},
 284                 {CPM_CLK_SMC2, CPM_CLK4, 2},
 285                 {CPM_CLK_SMC2, CPM_CLK15, 3},
 286         };
 287
 288         im_cpmux = cpm2_map(im_cpmux);
 289
 290         switch (target) {
 291         case CPM_CLK_SMC1:
 292                 reg = &im_cpmux->cmx_smr;
 293                 mask = 3;
 294                 shift = 4;
 295                 break;
 296         case CPM_CLK_SMC2:
 297                 reg = &im_cpmux->cmx_smr;
 298                 mask = 3;
 299                 shift = 0;
 300                 break;
 301         default:
 302                 printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
 303                 return -EINVAL;
 304         }
 305
 306         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 307                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 308                         bits = clk_map[i][2];
 309                         break;
 310                 }
 311         }
 312         if (i == ARRAY_SIZE(clk_map))
 313             ret = -EINVAL;
 314
 315         bits <<= shift;
 316         mask <<= shift;
 317
 318         out_8(reg, (in_8(reg) & ~mask) | bits);
 319
 320         cpm2_unmap(im_cpmux);
 321         return ret;
 322 }
 323
 324 struct cpm2_ioports {
 325         u32 dir, par, sor, odr, dat;
 326         u32 res[3];
 327 };
 328
 329 void __init cpm2_set_pin(int port, int pin, int flags)
 330 {
 331         struct cpm2_ioports __iomem *iop =
 332                 (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
 333
 334         pin = 1 << (31 - pin);
 335
 336         if (flags & CPM_PIN_OUTPUT)
 337                 setbits32(&iop[port].dir, pin);
 338         else
 339                 clrbits32(&iop[port].dir, pin);
 340
 341         if (!(flags & CPM_PIN_GPIO))
 342                 setbits32(&iop[port].par, pin);
 343         else
 344                 clrbits32(&iop[port].par, pin);
 345
 346         if (flags & CPM_PIN_SECONDARY)
 347                 setbits32(&iop[port].sor, pin);
 348         else
 349                 clrbits32(&iop[port].sor, pin);
 350
 351         if (flags & CPM_PIN_OPENDRAIN)
 352                 setbits32(&iop[port].odr, pin);
 353         else
 354                 clrbits32(&iop[port].odr, pin);
 355 }