arch/mips/vr41xx/common/cmu.c

   1 /*
   2  *  cmu.c, Clock Mask Unit routines for the NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2001-2002  MontaVista Software Inc.
   5  *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
   6  *  Copuright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 /*
  23  * Changes:
  24  *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
  25  *  - New creation, NEC VR4122 and VR4131 are supported.
  26  *  - Added support for NEC VR4111 and VR4121.
  27  *
  28  *  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
  29  *  - Added support for NEC VR4133.
  30  */
  31 #include <linux/init.h>
  32 #include <linux/ioport.h>
  33 #include <linux/module.h>
  34 #include <linux/smp.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/types.h>
  37
  38 #include <asm/cpu.h>
  39 #include <asm/io.h>
  40 #include <asm/vr41xx/vr41xx.h>
  41
  42 #define CMU_TYPE1_BASE  0x0b000060UL
  43 #define CMU_TYPE1_SIZE  0x4
  44
  45 #define CMU_TYPE2_BASE  0x0f000060UL
  46 #define CMU_TYPE2_SIZE  0x4
  47
  48 #define CMU_TYPE3_BASE  0x0f000060UL
  49 #define CMU_TYPE3_SIZE  0x8
  50
  51 #define CMUCLKMSK       0x0
  52  #define MSKPIU         0x0001
  53  #define MSKSIU         0x0002
  54  #define MSKAIU         0x0004
  55  #define MSKKIU         0x0008
  56  #define MSKFIR         0x0010
  57  #define MSKDSIU        0x0820
  58  #define MSKCSI         0x0040
  59  #define MSKPCIU        0x0080
  60  #define MSKSSIU        0x0100
  61  #define MSKSHSP        0x0200
  62  #define MSKFFIR        0x0400
  63  #define MSKSCSI        0x1000
  64  #define MSKPPCIU       0x2000
  65 #define CMUCLKMSK2      0x4
  66  #define MSKCEU         0x0001
  67  #define MSKMAC0        0x0002
  68  #define MSKMAC1        0x0004
  69
  70 static void __iomem *cmu_base;
  71 static uint16_t cmuclkmsk, cmuclkmsk2;
  72 static DEFINE_SPINLOCK(cmu_lock);
  73
  74 #define cmu_read(offset)                readw(cmu_base + (offset))
  75 #define cmu_write(offset, value)        writew((value), cmu_base + (offset))
  76
  77 void vr41xx_supply_clock(vr41xx_clock_t clock)
  78 {
  79         spin_lock_irq(&cmu_lock);
  80
  81         switch (clock) {
  82         case PIU_CLOCK:
  83                 cmuclkmsk |= MSKPIU;
  84                 break;
  85         case SIU_CLOCK:
  86                 cmuclkmsk |= MSKSIU | MSKSSIU;
  87                 break;
  88         case AIU_CLOCK:
  89                 cmuclkmsk |= MSKAIU;
  90                 break;
  91         case KIU_CLOCK:
  92                 cmuclkmsk |= MSKKIU;
  93                 break;
  94         case FIR_CLOCK:
  95                 cmuclkmsk |= MSKFIR | MSKFFIR;
  96                 break;
  97         case DSIU_CLOCK:
  98                 if (current_cpu_type() == CPU_VR4111 ||
  99                     current_cpu_type() == CPU_VR4121)
 100                         cmuclkmsk |= MSKDSIU;
 101                 else
 102                         cmuclkmsk |= MSKSIU | MSKDSIU;
 103                 break;
 104         case CSI_CLOCK:
 105                 cmuclkmsk |= MSKCSI | MSKSCSI;
 106                 break;
 107         case PCIU_CLOCK:
 108                 cmuclkmsk |= MSKPCIU;
 109                 break;
 110         case HSP_CLOCK:
 111                 cmuclkmsk |= MSKSHSP;
 112                 break;
 113         case PCI_CLOCK:
 114                 cmuclkmsk |= MSKPPCIU;
 115                 break;
 116         case CEU_CLOCK:
 117                 cmuclkmsk2 |= MSKCEU;
 118                 break;
 119         case ETHER0_CLOCK:
 120                 cmuclkmsk2 |= MSKMAC0;
 121                 break;
 122         case ETHER1_CLOCK:
 123                 cmuclkmsk2 |= MSKMAC1;
 124                 break;
 125         default:
 126                 break;
 127         }
 128
 129         if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
 130             clock == ETHER1_CLOCK)
 131                 cmu_write(CMUCLKMSK2, cmuclkmsk2);
 132         else
 133                 cmu_write(CMUCLKMSK, cmuclkmsk);
 134
 135         spin_unlock_irq(&cmu_lock);
 136 }
 137
 138 EXPORT_SYMBOL_GPL(vr41xx_supply_clock);
 139
 140 void vr41xx_mask_clock(vr41xx_clock_t clock)
 141 {
 142         spin_lock_irq(&cmu_lock);
 143
 144         switch (clock) {
 145         case PIU_CLOCK:
 146                 cmuclkmsk &= ~MSKPIU;
 147                 break;
 148         case SIU_CLOCK:
 149                 if (current_cpu_type() == CPU_VR4111 ||
 150                     current_cpu_type() == CPU_VR4121) {
 151                         cmuclkmsk &= ~(MSKSIU | MSKSSIU);
 152                 } else {
 153                         if (cmuclkmsk & MSKDSIU)
 154                                 cmuclkmsk &= ~MSKSSIU;
 155                         else
 156                                 cmuclkmsk &= ~(MSKSIU | MSKSSIU);
 157                 }
 158                 break;
 159         case AIU_CLOCK:
 160                 cmuclkmsk &= ~MSKAIU;
 161                 break;
 162         case KIU_CLOCK:
 163                 cmuclkmsk &= ~MSKKIU;
 164                 break;
 165         case FIR_CLOCK:
 166                 cmuclkmsk &= ~(MSKFIR | MSKFFIR);
 167                 break;
 168         case DSIU_CLOCK:
 169                 if (current_cpu_type() == CPU_VR4111 ||
 170                     current_cpu_type() == CPU_VR4121) {
 171                         cmuclkmsk &= ~MSKDSIU;
 172                 } else {
 173                         if (cmuclkmsk & MSKSSIU)
 174                                 cmuclkmsk &= ~MSKDSIU;
 175                         else
 176                                 cmuclkmsk &= ~(MSKSIU | MSKDSIU);
 177                 }
 178                 break;
 179         case CSI_CLOCK:
 180                 cmuclkmsk &= ~(MSKCSI | MSKSCSI);
 181                 break;
 182         case PCIU_CLOCK:
 183                 cmuclkmsk &= ~MSKPCIU;
 184                 break;
 185         case HSP_CLOCK:
 186                 cmuclkmsk &= ~MSKSHSP;
 187                 break;
 188         case PCI_CLOCK:
 189                 cmuclkmsk &= ~MSKPPCIU;
 190                 break;
 191         case CEU_CLOCK:
 192                 cmuclkmsk2 &= ~MSKCEU;
 193                 break;
 194         case ETHER0_CLOCK:
 195                 cmuclkmsk2 &= ~MSKMAC0;
 196                 break;
 197         case ETHER1_CLOCK:
 198                 cmuclkmsk2 &= ~MSKMAC1;
 199                 break;
 200         default:
 201                 break;
 202         }
 203
 204         if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
 205             clock == ETHER1_CLOCK)
 206                 cmu_write(CMUCLKMSK2, cmuclkmsk2);
 207         else
 208                 cmu_write(CMUCLKMSK, cmuclkmsk);
 209
 210         spin_unlock_irq(&cmu_lock);
 211 }
 212
 213 EXPORT_SYMBOL_GPL(vr41xx_mask_clock);
 214
 215 static int __init vr41xx_cmu_init(void)
 216 {
 217         unsigned long start, size;
 218
 219         switch (current_cpu_type()) {
 220         case CPU_VR4111:
 221         case CPU_VR4121:
 222                 start = CMU_TYPE1_BASE;
 223                 size = CMU_TYPE1_SIZE;
 224                 break;
 225         case CPU_VR4122:
 226         case CPU_VR4131:
 227                 start = CMU_TYPE2_BASE;
 228                 size = CMU_TYPE2_SIZE;
 229                 break;
 230         case CPU_VR4133:
 231                 start = CMU_TYPE3_BASE;
 232                 size = CMU_TYPE3_SIZE;
 233                 break;
 234         default:
 235                 panic("Unexpected CPU of NEC VR4100 series");
 236                 break;
 237         }
 238
 239         if (request_mem_region(start, size, "CMU") == NULL)
 240                 return -EBUSY;
 241
 242         cmu_base = ioremap(start, size);
 243         if (cmu_base == NULL) {
 244                 release_mem_region(start, size);
 245                 return -EBUSY;
 246         }
 247
 248         cmuclkmsk = cmu_read(CMUCLKMSK);
 249         if (current_cpu_type() == CPU_VR4133)
 250                 cmuclkmsk2 = cmu_read(CMUCLKMSK2);
 251
 252         spin_lock_init(&cmu_lock);
 253
 254         return 0;
 255 }
 256
 257 core_initcall(vr41xx_cmu_init);