KernelLand/Modules/armv7/GIC/gic.c

   1 /*
   2  * ARMv7 GIC Support
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * gic.c
   6  * - GIC Core
   7  */
   8 #define DEBUG   1
   9
  10 #include <acess.h>
  11 #include <modules.h>
  12 #include "gic.h"
  13 #include <options.h>
  14
  15 #define N_IRQS  1024
  16
  17 // === IMPORTS ===
  18 extern void     *gpIRQHandler;
  19 extern tPAddr   gGIC_DistributorAddr;
  20 extern tPAddr   gGIC_InterfaceAddr;
  21
  22 // === TYPES ===
  23 typedef void (*tIRQ_Handler)(int, void*);
  24
  25 // === PROTOTYPES ===
  26  int    GIC_Install(char **Arguments);
  27 void    GIC_IRQHandler(void);
  28
  29 // === GLOBALS ===
  30 MODULE_DEFINE(0, 0x100, armv7_GIC, GIC_Install, NULL, NULL);
  31 Uint32  *gpGIC_DistributorBase;
  32 Uint32  *gpGIC_InterfaceBase;
  33 tIRQ_Handler    gaIRQ_Handlers[N_IRQS];
  34 void    *gaIRQ_HandlerData[N_IRQS];
  35
  36 // === CODE ===
  37 int GIC_Install(char **Arguments)
  38 {
  39         // Initialise
  40         gpGIC_InterfaceBase = (void*)MM_MapHWPages(gGIC_InterfaceAddr, 1);
  41         LOG("gpGIC_InterfaceBase = %p", gpGIC_InterfaceBase);
  42         gpGIC_DistributorBase = (void*)MM_MapHWPages(gGIC_DistributorAddr, 1);
  43         LOG("gpGIC_DistributorBase = %p", gpGIC_DistributorBase);
  44
  45         gpGIC_InterfaceBase[GICC_PMR] = 0xFF;
  46         gpGIC_InterfaceBase[GICC_CTLR] = 1;     // Enable CPU
  47         gpGIC_DistributorBase[GICD_CTLR] = 1;   // Enable Distributor
  48
  49         gpIRQHandler = GIC_IRQHandler;
  50
  51         __asm__ __volatile__ ("cpsie if");      // Enable IRQs and FIQs
  52
  53         return MODULE_ERR_OK;
  54 }
  55
  56 void GIC_IRQHandler(void)
  57 {
  58         Uint32  num = gpGIC_InterfaceBase[GICC_IAR];
  59 //      Log_Debug("GIC", "IRQ 0x%x", num);
  60         gaIRQ_Handlers[num]( num, gaIRQ_HandlerData[num] );
  61         gpGIC_InterfaceBase[GICC_EOIR] = num;
  62 }
  63
  64 int IRQ_AddHandler(int IRQ, tIRQ_Handler Handler, void *Ptr)
  65 {
  66         if( IRQ < 0 || IRQ >= N_IRQS-32 ) {
  67                 return 1;
  68         }
  69
  70         LOG("IRQ = %i", IRQ);
  71         IRQ += 32;      // 32 internal IRQs
  72         LOG("IRQ = %i (after adjust)", IRQ);
  73         LOG("mask = 0x%x", 1 << (IRQ & (31-1)));
  74         gpGIC_DistributorBase[GICD_ISENABLER0+IRQ/32] = 1 << (IRQ & (32-1));
  75         ((Uint8*)&gpGIC_DistributorBase[GICD_ITARGETSR0])[IRQ] = 1;
  76
  77 //      Log_Warning("GIC", "TODO: Implement IRQ_AddHandler");
  78
  79         if( gaIRQ_Handlers[IRQ] )
  80                 return 2;
  81
  82         gaIRQ_Handlers[IRQ] = Handler;
  83         gaIRQ_HandlerData[IRQ] = Ptr;
  84
  85         return 0;
  86 }
  87