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 void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src)
 119 {
 120         u32 __iomem *bp;
 121         u32 val;
 122
 123         /* This is good enough to get SMCs running.....
 124         */
 125         if (brg < 4) {
 126                 bp = cpm2_map_size(im_brgc1, 16);
 127         } else {
 128                 bp = cpm2_map_size(im_brgc5, 16);
 129                 brg -= 4;
 130         }
 131         bp += brg;
 132         val = (((clk / rate) - 1) << 1) | CPM_BRG_EN | src;
 133         if (div16)
 134                 val |= CPM_BRG_DIV16;
 135
 136         out_be32(bp, val);
 137         cpm2_unmap(bp);
 138 }
 139 EXPORT_SYMBOL(__cpm2_setbrg);
 140
 141 int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 142 {
 143         int ret = 0;
 144         int shift;
 145         int i, bits = 0;
 146         cpmux_t __iomem *im_cpmux;
 147         u32 __iomem *reg;
 148         u32 mask = 7;
 149
 150         u8 clk_map[][3] = {
 151                 {CPM_CLK_FCC1, CPM_BRG5, 0},
 152                 {CPM_CLK_FCC1, CPM_BRG6, 1},
 153                 {CPM_CLK_FCC1, CPM_BRG7, 2},
 154                 {CPM_CLK_FCC1, CPM_BRG8, 3},
 155                 {CPM_CLK_FCC1, CPM_CLK9, 4},
 156                 {CPM_CLK_FCC1, CPM_CLK10, 5},
 157                 {CPM_CLK_FCC1, CPM_CLK11, 6},
 158                 {CPM_CLK_FCC1, CPM_CLK12, 7},
 159                 {CPM_CLK_FCC2, CPM_BRG5, 0},
 160                 {CPM_CLK_FCC2, CPM_BRG6, 1},
 161                 {CPM_CLK_FCC2, CPM_BRG7, 2},
 162                 {CPM_CLK_FCC2, CPM_BRG8, 3},
 163                 {CPM_CLK_FCC2, CPM_CLK13, 4},
 164                 {CPM_CLK_FCC2, CPM_CLK14, 5},
 165                 {CPM_CLK_FCC2, CPM_CLK15, 6},
 166                 {CPM_CLK_FCC2, CPM_CLK16, 7},
 167                 {CPM_CLK_FCC3, CPM_BRG5, 0},
 168                 {CPM_CLK_FCC3, CPM_BRG6, 1},
 169                 {CPM_CLK_FCC3, CPM_BRG7, 2},
 170                 {CPM_CLK_FCC3, CPM_BRG8, 3},
 171                 {CPM_CLK_FCC3, CPM_CLK13, 4},
 172                 {CPM_CLK_FCC3, CPM_CLK14, 5},
 173                 {CPM_CLK_FCC3, CPM_CLK15, 6},
 174                 {CPM_CLK_FCC3, CPM_CLK16, 7},
 175                 {CPM_CLK_SCC1, CPM_BRG1, 0},
 176                 {CPM_CLK_SCC1, CPM_BRG2, 1},
 177                 {CPM_CLK_SCC1, CPM_BRG3, 2},
 178                 {CPM_CLK_SCC1, CPM_BRG4, 3},
 179                 {CPM_CLK_SCC1, CPM_CLK11, 4},
 180                 {CPM_CLK_SCC1, CPM_CLK12, 5},
 181                 {CPM_CLK_SCC1, CPM_CLK3, 6},
 182                 {CPM_CLK_SCC1, CPM_CLK4, 7},
 183                 {CPM_CLK_SCC2, CPM_BRG1, 0},
 184                 {CPM_CLK_SCC2, CPM_BRG2, 1},
 185                 {CPM_CLK_SCC2, CPM_BRG3, 2},
 186                 {CPM_CLK_SCC2, CPM_BRG4, 3},
 187                 {CPM_CLK_SCC2, CPM_CLK11, 4},
 188                 {CPM_CLK_SCC2, CPM_CLK12, 5},
 189                 {CPM_CLK_SCC2, CPM_CLK3, 6},
 190                 {CPM_CLK_SCC2, CPM_CLK4, 7},
 191                 {CPM_CLK_SCC3, CPM_BRG1, 0},
 192                 {CPM_CLK_SCC3, CPM_BRG2, 1},
 193                 {CPM_CLK_SCC3, CPM_BRG3, 2},
 194                 {CPM_CLK_SCC3, CPM_BRG4, 3},
 195                 {CPM_CLK_SCC3, CPM_CLK5, 4},
 196                 {CPM_CLK_SCC3, CPM_CLK6, 5},
 197                 {CPM_CLK_SCC3, CPM_CLK7, 6},
 198                 {CPM_CLK_SCC3, CPM_CLK8, 7},
 199                 {CPM_CLK_SCC4, CPM_BRG1, 0},
 200                 {CPM_CLK_SCC4, CPM_BRG2, 1},
 201                 {CPM_CLK_SCC4, CPM_BRG3, 2},
 202                 {CPM_CLK_SCC4, CPM_BRG4, 3},
 203                 {CPM_CLK_SCC4, CPM_CLK5, 4},
 204                 {CPM_CLK_SCC4, CPM_CLK6, 5},
 205                 {CPM_CLK_SCC4, CPM_CLK7, 6},
 206                 {CPM_CLK_SCC4, CPM_CLK8, 7},
 207         };
 208
 209         im_cpmux = cpm2_map(im_cpmux);
 210
 211         switch (target) {
 212         case CPM_CLK_SCC1:
 213                 reg = &im_cpmux->cmx_scr;
 214                 shift = 24;
 215                 break;
 216         case CPM_CLK_SCC2:
 217                 reg = &im_cpmux->cmx_scr;
 218                 shift = 16;
 219                 break;
 220         case CPM_CLK_SCC3:
 221                 reg = &im_cpmux->cmx_scr;
 222                 shift = 8;
 223                 break;
 224         case CPM_CLK_SCC4:
 225                 reg = &im_cpmux->cmx_scr;
 226                 shift = 0;
 227                 break;
 228         case CPM_CLK_FCC1:
 229                 reg = &im_cpmux->cmx_fcr;
 230                 shift = 24;
 231                 break;
 232         case CPM_CLK_FCC2:
 233                 reg = &im_cpmux->cmx_fcr;
 234                 shift = 16;
 235                 break;
 236         case CPM_CLK_FCC3:
 237                 reg = &im_cpmux->cmx_fcr;
 238                 shift = 8;
 239                 break;
 240         default:
 241                 printk(KERN_ERR "cpm2_clock_setup: invalid clock target\n");
 242                 return -EINVAL;
 243         }
 244
 245         if (mode == CPM_CLK_RX)
 246                 shift += 3;
 247
 248         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 249                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 250                         bits = clk_map[i][2];
 251                         break;
 252                 }
 253         }
 254         if (i == ARRAY_SIZE(clk_map))
 255             ret = -EINVAL;
 256
 257         bits <<= shift;
 258         mask <<= shift;
 259
 260         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 261
 262         cpm2_unmap(im_cpmux);
 263         return ret;
 264 }
 265
 266 int cpm2_smc_clk_setup(enum cpm_clk_target target, int clock)
 267 {
 268         int ret = 0;
 269         int shift;
 270         int i, bits = 0;
 271         cpmux_t __iomem *im_cpmux;
 272         u8 __iomem *reg;
 273         u8 mask = 3;
 274
 275         u8 clk_map[][3] = {
 276                 {CPM_CLK_SMC1, CPM_BRG1, 0},
 277                 {CPM_CLK_SMC1, CPM_BRG7, 1},
 278                 {CPM_CLK_SMC1, CPM_CLK7, 2},
 279                 {CPM_CLK_SMC1, CPM_CLK9, 3},
 280                 {CPM_CLK_SMC2, CPM_BRG2, 0},
 281                 {CPM_CLK_SMC2, CPM_BRG8, 1},
 282                 {CPM_CLK_SMC2, CPM_CLK4, 2},
 283                 {CPM_CLK_SMC2, CPM_CLK15, 3},
 284         };
 285
 286         im_cpmux = cpm2_map(im_cpmux);
 287
 288         switch (target) {
 289         case CPM_CLK_SMC1:
 290                 reg = &im_cpmux->cmx_smr;
 291                 mask = 3;
 292                 shift = 4;
 293                 break;
 294         case CPM_CLK_SMC2:
 295                 reg = &im_cpmux->cmx_smr;
 296                 mask = 3;
 297                 shift = 0;
 298                 break;
 299         default:
 300                 printk(KERN_ERR "cpm2_smc_clock_setup: invalid clock target\n");
 301                 return -EINVAL;
 302         }
 303
 304         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 305                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 306                         bits = clk_map[i][2];
 307                         break;
 308                 }
 309         }
 310         if (i == ARRAY_SIZE(clk_map))
 311             ret = -EINVAL;
 312
 313         bits <<= shift;
 314         mask <<= shift;
 315
 316         out_8(reg, (in_8(reg) & ~mask) | bits);
 317
 318         cpm2_unmap(im_cpmux);
 319         return ret;
 320 }
 321
 322 struct cpm2_ioports {
 323         u32 dir, par, sor, odr, dat;
 324         u32 res[3];
 325 };
 326
 327 void cpm2_set_pin(int port, int pin, int flags)
 328 {
 329         struct cpm2_ioports __iomem *iop =
 330                 (struct cpm2_ioports __iomem *)&cpm2_immr->im_ioport;
 331
 332         pin = 1 << (31 - pin);
 333
 334         if (flags & CPM_PIN_OUTPUT)
 335                 setbits32(&iop[port].dir, pin);
 336         else
 337                 clrbits32(&iop[port].dir, pin);
 338
 339         if (!(flags & CPM_PIN_GPIO))
 340                 setbits32(&iop[port].par, pin);
 341         else
 342                 clrbits32(&iop[port].par, pin);
 343
 344         if (flags & CPM_PIN_SECONDARY)
 345                 setbits32(&iop[port].sor, pin);
 346         else
 347                 clrbits32(&iop[port].sor, pin);
 348
 349         if (flags & CPM_PIN_OPENDRAIN)
 350                 setbits32(&iop[port].odr, pin);
 351         else
 352                 clrbits32(&iop[port].odr, pin);
 353 }
 354
 355 static int cpm_init_par_io(void)
 356 {
 357         struct device_node *np;
 358
 359         for_each_compatible_node(np, NULL, "fsl,cpm2-pario-bank")
 360                 cpm2_gpiochip_add32(np);
 361         return 0;
 362 }
 363 arch_initcall(cpm_init_par_io);
 364