arch/ppc/syslib/gt64260_pic.c

   1 /*
   2  * Interrupt controller support for Galileo's GT64260.
   3  *
   4  * Author: Chris Zankel <source@mvista.com>
   5  * Modified by: Mark A. Greer <mgreer@mvista.com>
   6  *
   7  * Based on sources from Rabeeh Khoury / Galileo Technology
   8  *
   9  * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
  10  * the terms of the GNU General Public License version 2.  This program
  11  * is licensed "as is" without any warranty of any kind, whether express
  12  * or implied.
  13  */
  14
  15 /*
  16  * This file contains the specific functions to support the GT64260
  17  * interrupt controller.
  18  *
  19  * The GT64260 has two main interrupt registers (high and low) that
  20  * summarizes the interrupts generated by the units of the GT64260.
  21  * Each bit is assigned to an interrupt number, where the low register
  22  * are assigned from IRQ0 to IRQ31 and the high cause register
  23  * from IRQ32 to IRQ63
  24  * The GPP (General Purpose Port) interrupts are assigned from IRQ64 (GPP0)
  25  * to IRQ95 (GPP31).
  26  * get_irq() returns the lowest interrupt number that is currently asserted.
  27  *
  28  * Note:
  29  *  - This driver does not initialize the GPP when used as an interrupt
  30  *    input.
  31  */
  32
  33 #include <linux/stddef.h>
  34 #include <linux/init.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/sched.h>
  37 #include <linux/signal.h>
  38 #include <linux/stddef.h>
  39 #include <linux/delay.h>
  40 #include <linux/irq.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/system.h>
  44 #include <asm/irq.h>
  45 #include <asm/mv64x60.h>
  46 #include <asm/machdep.h>
  47
  48 #define CPU_INTR_STR    "gt64260 cpu interface error"
  49 #define PCI0_INTR_STR   "gt64260 pci 0 error"
  50 #define PCI1_INTR_STR   "gt64260 pci 1 error"
  51
  52 /* ========================== forward declaration ========================== */
  53
  54 static void gt64260_unmask_irq(unsigned int);
  55 static void gt64260_mask_irq(unsigned int);
  56
  57 /* ========================== local declarations =========================== */
  58
  59 struct hw_interrupt_type gt64260_pic = {
  60         .typename = " gt64260_pic ",
  61         .enable   = gt64260_unmask_irq,
  62         .disable  = gt64260_mask_irq,
  63         .ack      = gt64260_mask_irq,
  64         .end      = gt64260_unmask_irq,
  65 };
  66
  67 u32 gt64260_irq_base = 0;       /* GT64260 handles the next 96 IRQs from here */
  68
  69 static struct mv64x60_handle bh;
  70
  71 /* gt64260_init_irq()
  72  *
  73  *  This function initializes the interrupt controller. It assigns
  74  *  all interrupts from IRQ0 to IRQ95 to the gt64260 interrupt controller.
  75  *
  76  * Note:
  77  *  We register all GPP inputs as interrupt source, but disable them.
  78  */
  79 void __init
  80 gt64260_init_irq(void)
  81 {
  82         int i;
  83
  84         if (ppc_md.progress)
  85                 ppc_md.progress("gt64260_init_irq: enter", 0x0);
  86
  87         bh.v_base = mv64x60_get_bridge_vbase();
  88
  89         ppc_cached_irq_mask[0] = 0;
  90         ppc_cached_irq_mask[1] = 0x0f000000;    /* Enable GPP intrs */
  91         ppc_cached_irq_mask[2] = 0;
  92
  93         /* disable all interrupts and clear current interrupts */
  94         mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
  95         mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
  96         mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO, ppc_cached_irq_mask[0]);
  97         mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI, ppc_cached_irq_mask[1]);
  98
  99         /* use the gt64260 for all (possible) interrupt sources */
 100         for (i = gt64260_irq_base; i < (gt64260_irq_base + 96); i++)
 101                 irq_desc[i].chip = &gt64260_pic;
 102
 103         if (ppc_md.progress)
 104                 ppc_md.progress("gt64260_init_irq: exit", 0x0);
 105 }
 106
 107 /*
 108  * gt64260_get_irq()
 109  *
 110  *  This function returns the lowest interrupt number of all interrupts that
 111  *  are currently asserted.
 112  *
 113  * Input Variable(s):
 114  *  struct pt_regs*     not used
 115  *
 116  * Output Variable(s):
 117  *  None.
 118  *
 119  * Returns:
 120  *  int <interrupt number> or -2 (bogus interrupt)
 121  */
 122 int
 123 gt64260_get_irq(struct pt_regs *regs)
 124 {
 125         int irq;
 126         int irq_gpp;
 127
 128         irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_LO);
 129         irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
 130
 131         if (irq == -1) {
 132                 irq = mv64x60_read(&bh, GT64260_IC_MAIN_CAUSE_HI);
 133                 irq = __ilog2((irq & 0x0f000db7) & ppc_cached_irq_mask[1]);
 134
 135                 if (irq == -1)
 136                         irq = -2; /* bogus interrupt, should never happen */
 137                 else {
 138                         if (irq >= 24) {
 139                                 irq_gpp = mv64x60_read(&bh,
 140                                         MV64x60_GPP_INTR_CAUSE);
 141                                 irq_gpp = __ilog2(irq_gpp &
 142                                         ppc_cached_irq_mask[2]);
 143
 144                                 if (irq_gpp == -1)
 145                                         irq = -2;
 146                                 else {
 147                                         irq = irq_gpp + 64;
 148                                         mv64x60_write(&bh,
 149                                                 MV64x60_GPP_INTR_CAUSE,
 150                                                 ~(1 << (irq - 64)));
 151                                 }
 152                         } else
 153                                 irq += 32;
 154                 }
 155         }
 156
 157         (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
 158
 159         if (irq < 0)
 160                 return (irq);
 161         else
 162                 return (gt64260_irq_base + irq);
 163 }
 164
 165 /* gt64260_unmask_irq()
 166  *
 167  *  This function enables an interrupt.
 168  *
 169  * Input Variable(s):
 170  *  unsigned int        interrupt number (IRQ0...IRQ95).
 171  *
 172  * Output Variable(s):
 173  *  None.
 174  *
 175  * Returns:
 176  *  void
 177  */
 178 static void
 179 gt64260_unmask_irq(unsigned int irq)
 180 {
 181         irq -= gt64260_irq_base;
 182
 183         if (irq > 31)
 184                 if (irq > 63) /* unmask GPP irq */
 185                         mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
 186                                 ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
 187                 else /* mask high interrupt register */
 188                         mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI,
 189                                 ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
 190         else /* mask low interrupt register */
 191                 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO,
 192                         ppc_cached_irq_mask[0] |= (1 << irq));
 193
 194         (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
 195         return;
 196 }
 197
 198 /* gt64260_mask_irq()
 199  *
 200  *  This function disables the requested interrupt.
 201  *
 202  * Input Variable(s):
 203  *  unsigned int        interrupt number (IRQ0...IRQ95).
 204  *
 205  * Output Variable(s):
 206  *  None.
 207  *
 208  * Returns:
 209  *  void
 210  */
 211 static void
 212 gt64260_mask_irq(unsigned int irq)
 213 {
 214         irq -= gt64260_irq_base;
 215
 216         if (irq > 31)
 217                 if (irq > 63) /* mask GPP irq */
 218                         mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
 219                                 ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
 220                 else /* mask high interrupt register */
 221                         mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_HI,
 222                                 ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
 223         else /* mask low interrupt register */
 224                 mv64x60_write(&bh, GT64260_IC_CPU_INTR_MASK_LO,
 225                         ppc_cached_irq_mask[0] &= ~(1 << irq));
 226
 227         (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
 228         return;
 229 }
 230
 231 static irqreturn_t
 232 gt64260_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
 233 {
 234         printk(KERN_ERR "gt64260_cpu_error_int_handler: %s 0x%08x\n",
 235                 "Error on CPU interface - Cause regiser",
 236                 mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
 237         printk(KERN_ERR "\tCPU error register dump:\n");
 238         printk(KERN_ERR "\tAddress low  0x%08x\n",
 239                mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
 240         printk(KERN_ERR "\tAddress high 0x%08x\n",
 241                mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
 242         printk(KERN_ERR "\tData low     0x%08x\n",
 243                mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
 244         printk(KERN_ERR "\tData high    0x%08x\n",
 245                mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
 246         printk(KERN_ERR "\tParity       0x%08x\n",
 247                mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
 248         mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
 249         return IRQ_HANDLED;
 250 }
 251
 252 static irqreturn_t
 253 gt64260_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
 254 {
 255         u32 val;
 256         unsigned int pci_bus = (unsigned int)dev_id;
 257
 258         if (pci_bus == 0) {     /* Error on PCI 0 */
 259                 val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
 260                 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
 261                         "gt64260_pci_error_int_handler", pci_bus);
 262                 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
 263                 printk(KERN_ERR "\tCause register 0x%08x\n", val);
 264                 printk(KERN_ERR "\tAddress Low    0x%08x\n",
 265                        mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
 266                 printk(KERN_ERR "\tAddress High   0x%08x\n",
 267                        mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
 268                 printk(KERN_ERR "\tAttribute      0x%08x\n",
 269                        mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
 270                 printk(KERN_ERR "\tCommand        0x%08x\n",
 271                        mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
 272                 mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
 273         }
 274         if (pci_bus == 1) {     /* Error on PCI 1 */
 275                 val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
 276                 printk(KERN_ERR "%s: Error in PCI %d Interface\n",
 277                         "gt64260_pci_error_int_handler", pci_bus);
 278                 printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
 279                 printk(KERN_ERR "\tCause register 0x%08x\n", val);
 280                 printk(KERN_ERR "\tAddress Low    0x%08x\n",
 281                        mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
 282                 printk(KERN_ERR "\tAddress High   0x%08x\n",
 283                        mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
 284                 printk(KERN_ERR "\tAttribute      0x%08x\n",
 285                        mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
 286                 printk(KERN_ERR "\tCommand        0x%08x\n",
 287                        mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
 288                 mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
 289         }
 290         return IRQ_HANDLED;
 291 }
 292
 293 static int __init
 294 gt64260_register_hdlrs(void)
 295 {
 296         int rc;
 297
 298         /* Register CPU interface error interrupt handler */
 299         if ((rc = request_irq(MV64x60_IRQ_CPU_ERR,
 300                 gt64260_cpu_error_int_handler, IRQF_DISABLED, CPU_INTR_STR, 0)))
 301                 printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
 302
 303         mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
 304         mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000fe);
 305
 306         /* Register PCI 0 error interrupt handler */
 307         if ((rc = request_irq(MV64360_IRQ_PCI0, gt64260_pci_error_int_handler,
 308                     IRQF_DISABLED, PCI0_INTR_STR, (void *)0)))
 309                 printk(KERN_WARNING "Can't register pci 0 error handler: %d",
 310                         rc);
 311
 312         mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
 313         mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0x003c0c24);
 314
 315         /* Register PCI 1 error interrupt handler */
 316         if ((rc = request_irq(MV64360_IRQ_PCI1, gt64260_pci_error_int_handler,
 317                     IRQF_DISABLED, PCI1_INTR_STR, (void *)1)))
 318                 printk(KERN_WARNING "Can't register pci 1 error handler: %d",
 319                         rc);
 320
 321         mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
 322         mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0x003c0c24);
 323
 324         return 0;
 325 }
 326
 327 arch_initcall(gt64260_register_hdlrs);