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   1 /*
   2  * linux/arch/mips/tx4938/common/irq.c
   3  *
   4  * Common tx4938 irq handler
   5  * Copyright (C) 2000-2001 Toshiba Corporation
   6  *
   7  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   8  * terms of the GNU General Public License version 2. This program is
   9  * licensed "as is" without any warranty of any kind, whether express
  10  * or implied.
  11  *
  12  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  13  */
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/module.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>
  20 #include <linux/types.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/ioport.h>
  23 #include <linux/timex.h>
  24 #include <linux/slab.h>
  25 #include <linux/random.h>
  26 #include <linux/irq.h>
  27 #include <asm/bitops.h>
  28 #include <asm/bootinfo.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/mipsregs.h>
  32 #include <asm/system.h>
  33 #include <asm/wbflush.h>
  34 #include <asm/tx4938/rbtx4938.h>
  35
  36 /**********************************************************************************/
  37 /* Forwad definitions for all pic's                                               */
  38 /**********************************************************************************/
  39
  40 static void tx4938_irq_cp0_enable(unsigned int irq);
  41 static void tx4938_irq_cp0_disable(unsigned int irq);
  42 static void tx4938_irq_cp0_end(unsigned int irq);
  43
  44 static void tx4938_irq_pic_enable(unsigned int irq);
  45 static void tx4938_irq_pic_disable(unsigned int irq);
  46 static void tx4938_irq_pic_end(unsigned int irq);
  47
  48 /**********************************************************************************/
  49 /* Kernel structs for all pic's                                                   */
  50 /**********************************************************************************/
  51
  52 #define TX4938_CP0_NAME "TX4938-CP0"
  53 static struct irq_chip tx4938_irq_cp0_type = {
  54         .typename = TX4938_CP0_NAME,
  55         .ack = tx4938_irq_cp0_disable,
  56         .mask = tx4938_irq_cp0_disable,
  57         .mask_ack = tx4938_irq_cp0_disable,
  58         .unmask = tx4938_irq_cp0_enable,
  59         .end = tx4938_irq_cp0_end,
  60 };
  61
  62 #define TX4938_PIC_NAME "TX4938-PIC"
  63 static struct irq_chip tx4938_irq_pic_type = {
  64         .typename = TX4938_PIC_NAME,
  65         .ack = tx4938_irq_pic_disable,
  66         .mask = tx4938_irq_pic_disable,
  67         .mask_ack = tx4938_irq_pic_disable,
  68         .unmask = tx4938_irq_pic_enable,
  69         .end = tx4938_irq_pic_end,
  70 };
  71
  72 static struct irqaction tx4938_irq_pic_action = {
  73         .handler = no_action,
  74         .flags = 0,
  75         .mask = CPU_MASK_NONE,
  76         .name = TX4938_PIC_NAME
  77 };
  78
  79 /**********************************************************************************/
  80 /* Functions for cp0                                                              */
  81 /**********************************************************************************/
  82
  83 #define tx4938_irq_cp0_mask(irq) ( 1 << ( irq-TX4938_IRQ_CP0_BEG+8 ) )
  84
  85 static void __init
  86 tx4938_irq_cp0_init(void)
  87 {
  88         int i;
  89
  90         for (i = TX4938_IRQ_CP0_BEG; i <= TX4938_IRQ_CP0_END; i++)
  91                 set_irq_chip_and_handler(i, &tx4938_irq_cp0_type,
  92                                          handle_level_irq);
  93 }
  94
  95 static void
  96 tx4938_irq_cp0_enable(unsigned int irq)
  97 {
  98         set_c0_status(tx4938_irq_cp0_mask(irq));
  99 }
 100
 101 static void
 102 tx4938_irq_cp0_disable(unsigned int irq)
 103 {
 104         clear_c0_status(tx4938_irq_cp0_mask(irq));
 105 }
 106
 107 static void
 108 tx4938_irq_cp0_end(unsigned int irq)
 109 {
 110         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 111                 tx4938_irq_cp0_enable(irq);
 112         }
 113 }
 114
 115 /**********************************************************************************/
 116 /* Functions for pic                                                              */
 117 /**********************************************************************************/
 118
 119 u32
 120 tx4938_irq_pic_addr(int irq)
 121 {
 122         /* MVMCP -- need to formulize this */
 123         irq -= TX4938_IRQ_PIC_BEG;
 124
 125         switch (irq) {
 126         case 17:
 127         case 16:
 128         case 1:
 129         case 0:{
 130                         return (TX4938_MKA(TX4938_IRC_IRLVL0));
 131                 }
 132         case 19:
 133         case 18:
 134         case 3:
 135         case 2:{
 136                         return (TX4938_MKA(TX4938_IRC_IRLVL1));
 137                 }
 138         case 21:
 139         case 20:
 140         case 5:
 141         case 4:{
 142                         return (TX4938_MKA(TX4938_IRC_IRLVL2));
 143                 }
 144         case 23:
 145         case 22:
 146         case 7:
 147         case 6:{
 148                         return (TX4938_MKA(TX4938_IRC_IRLVL3));
 149                 }
 150         case 25:
 151         case 24:
 152         case 9:
 153         case 8:{
 154                         return (TX4938_MKA(TX4938_IRC_IRLVL4));
 155                 }
 156         case 27:
 157         case 26:
 158         case 11:
 159         case 10:{
 160                         return (TX4938_MKA(TX4938_IRC_IRLVL5));
 161                 }
 162         case 29:
 163         case 28:
 164         case 13:
 165         case 12:{
 166                         return (TX4938_MKA(TX4938_IRC_IRLVL6));
 167                 }
 168         case 31:
 169         case 30:
 170         case 15:
 171         case 14:{
 172                         return (TX4938_MKA(TX4938_IRC_IRLVL7));
 173                 }
 174         }
 175
 176         return 0;
 177 }
 178
 179 u32
 180 tx4938_irq_pic_mask(int irq)
 181 {
 182         /* MVMCP -- need to formulize this */
 183         irq -= TX4938_IRQ_PIC_BEG;
 184
 185         switch (irq) {
 186         case 31:
 187         case 29:
 188         case 27:
 189         case 25:
 190         case 23:
 191         case 21:
 192         case 19:
 193         case 17:{
 194                         return (0x07000000);
 195                 }
 196         case 30:
 197         case 28:
 198         case 26:
 199         case 24:
 200         case 22:
 201         case 20:
 202         case 18:
 203         case 16:{
 204                         return (0x00070000);
 205                 }
 206         case 15:
 207         case 13:
 208         case 11:
 209         case 9:
 210         case 7:
 211         case 5:
 212         case 3:
 213         case 1:{
 214                         return (0x00000700);
 215                 }
 216         case 14:
 217         case 12:
 218         case 10:
 219         case 8:
 220         case 6:
 221         case 4:
 222         case 2:
 223         case 0:{
 224                         return (0x00000007);
 225                 }
 226         }
 227         return 0x00000000;
 228 }
 229
 230 static void
 231 tx4938_irq_pic_modify(unsigned pic_reg, unsigned clr_bits, unsigned set_bits)
 232 {
 233         unsigned long val = 0;
 234
 235         val = TX4938_RD(pic_reg);
 236         val &= (~clr_bits);
 237         val |= (set_bits);
 238         TX4938_WR(pic_reg, val);
 239         mmiowb();
 240         TX4938_RD(pic_reg);
 241 }
 242
 243 static void __init
 244 tx4938_irq_pic_init(void)
 245 {
 246         int i;
 247
 248         for (i = TX4938_IRQ_PIC_BEG; i <= TX4938_IRQ_PIC_END; i++)
 249                 set_irq_chip_and_handler(i, &tx4938_irq_pic_type,
 250                                          handle_level_irq);
 251
 252         setup_irq(TX4938_IRQ_NEST_PIC_ON_CP0, &tx4938_irq_pic_action);
 253
 254         TX4938_WR(0xff1ff640, 0x6);     /* irq level mask -- only accept hightest */
 255         TX4938_WR(0xff1ff600, TX4938_RD(0xff1ff600) | 0x1);     /* irq enable */
 256 }
 257
 258 static void
 259 tx4938_irq_pic_enable(unsigned int irq)
 260 {
 261         tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq), 0,
 262                               tx4938_irq_pic_mask(irq));
 263 }
 264
 265 static void
 266 tx4938_irq_pic_disable(unsigned int irq)
 267 {
 268         tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq),
 269                               tx4938_irq_pic_mask(irq), 0);
 270 }
 271
 272 static void
 273 tx4938_irq_pic_end(unsigned int irq)
 274 {
 275         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
 276                 tx4938_irq_pic_enable(irq);
 277         }
 278 }
 279
 280 /**********************************************************************************/
 281 /* Main init functions                                                            */
 282 /**********************************************************************************/
 283
 284 void __init
 285 tx4938_irq_init(void)
 286 {
 287         tx4938_irq_cp0_init();
 288         tx4938_irq_pic_init();
 289 }
 290
 291 int
 292 tx4938_irq_nested(void)
 293 {
 294         int sw_irq = 0;
 295         u32 level2;
 296
 297         level2 = TX4938_RD(0xff1ff6a0);
 298         if ((level2 & 0x10000) == 0) {
 299                 level2 &= 0x1f;
 300                 sw_irq = TX4938_IRQ_PIC_BEG + level2;
 301                 if (sw_irq == 26) {
 302                         {
 303                                 extern int toshiba_rbtx4938_irq_nested(int sw_irq);
 304                                 sw_irq = toshiba_rbtx4938_irq_nested(sw_irq);
 305                         }
 306                 }
 307         }
 308
 309         wbflush();
 310         return sw_irq;
 311 }
 312
 313 asmlinkage void plat_irq_dispatch(void)
 314 {
 315         unsigned int pending = read_c0_cause() & read_c0_status();
 316
 317         if (pending & STATUSF_IP7)
 318                 do_IRQ(TX4938_IRQ_CPU_TIMER);
 319         else if (pending & STATUSF_IP2) {
 320                 int irq = tx4938_irq_nested();
 321                 if (irq)
 322                         do_IRQ(irq);
 323                 else
 324                         spurious_interrupt();
 325         } else if (pending & STATUSF_IP1)
 326                 do_IRQ(TX4938_IRQ_USER1);
 327         else if (pending & STATUSF_IP0)
 328                 do_IRQ(TX4938_IRQ_USER0);
 329 }