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
  14 #define N_IRQS  1024
  15
  16 // === IMPORTS ===
  17 extern void     *gpIRQHandler;
  18
  19 // === TYPES ===
  20 typedef void (*tIRQ_Handler)(int, void*);
  21
  22 // === PROTOTYPES ===
  23  int    GIC_Install(char **Arguments);
  24 void    GIC_IRQHandler(void);
  25
  26 // === GLOBALS ===
  27 MODULE_DEFINE(0, 0x100, armv7_GIC, GIC_Install, NULL, NULL);
  28 Uint32  *gpGIC_DistributorBase;
  29 Uint32  *gpGIC_InterfaceBase;
  30 tPAddr  gGIC_DistributorAddr;
  31 tPAddr  gGIC_InterfaceAddr;
  32 tIRQ_Handler    gaIRQ_Handlers[N_IRQS];
  33 void    *gaIRQ_HandlerData[N_IRQS];
  34
  35 // === CODE ===
  36 int GIC_Install(char **Arguments)
  37 {
  38         // Realview PB
  39         gGIC_InterfaceAddr   = 0x1e000000;
  40         gGIC_DistributorAddr = 0x1e001000;
  41
  42         // Initialise
  43         gpGIC_InterfaceBase = (void*)MM_MapHWPages(gGIC_InterfaceAddr, 1);
  44         gpGIC_DistributorBase = (void*)MM_MapHWPages(gGIC_DistributorAddr, 1);
  45
  46         gpGIC_InterfaceBase[GICC_PMR] = 0xFF;
  47         gpGIC_InterfaceBase[GICC_CTLR] = 1;     // Enable CPU
  48         gpGIC_DistributorBase[GICD_CTLR] = 1;   // Enable Distributor
  49
  50         gpIRQHandler = GIC_IRQHandler;
  51
  52         __asm__ __volatile__ ("cpsie if");      // Enable IRQs and FIQs
  53
  54         return MODULE_ERR_OK;
  55 }
  56
  57 void GIC_IRQHandler(void)
  58 {
  59         Uint32  num = gpGIC_InterfaceBase[GICC_IAR];
  60 //      Log_Debug("GIC", "IRQ 0x%x", num);
  61         gaIRQ_Handlers[num]( num, gaIRQ_HandlerData[num] );
  62         gpGIC_InterfaceBase[GICC_EOIR] = num;
  63 }
  64
  65 int IRQ_AddHandler(int IRQ, tIRQ_Handler Handler, void *Ptr)
  66 {
  67         if( IRQ < 0 || IRQ >= N_IRQS-32 ) {
  68                 return 1;
  69         }
  70
  71         LOG("IRQ = %i", IRQ);
  72         IRQ += 32;      // 32 internal IRQs
  73         LOG("IRQ = %i (after adjust)", IRQ);
  74         LOG("mask = 0x%x", 1 << (IRQ & (31-1)));
  75         gpGIC_DistributorBase[GICD_ISENABLER0+IRQ/32] = 1 << (IRQ & (32-1));
  76         ((Uint8*)&gpGIC_DistributorBase[GICD_ITARGETSR0])[IRQ] = 1;
  77
  78 //      Log_Warning("GIC", "TODO: Implement IRQ_AddHandler");
  79
  80         if( gaIRQ_Handlers[IRQ] )
  81                 return 2;
  82
  83         gaIRQ_Handlers[IRQ] = Handler;
  84         gaIRQ_HandlerData[IRQ] = Ptr;
  85
  86         return 0;
  87 }
  88