Build - Restructured configuration

[tpg/acess2.git] / Modules / armv7 / GIC / gic.c

diff --git a/Modules/armv7/GIC/gic.c b/Modules/armv7/GIC/gic.c
index e69de29..8dbab3a 100644 (file)
--- a/Modules/armv7/GIC/gic.c
+++ b/Modules/armv7/GIC/gic.c
@@ -0,0 +1,91 @@
+/*
+ * ARMv7 GIC Support
+ * - By John Hodge (thePowersGang)
+ * 
+ * gic.c
+ * - GIC Core
+ */
+#define DEBUG  1
+
+#include <acess.h>
+#include <modules.h>
+#include "gic.h"
+#include <options.h>
+
+#define N_IRQS 1024
+
+// === IMPORTS ===
+extern void    *gpIRQHandler;
+
+// === TYPES ===
+typedef void (*tIRQ_Handler)(int, void*);
+
+// === PROTOTYPES ===
+ int   GIC_Install(char **Arguments);
+void   GIC_IRQHandler(void);
+
+// === GLOBALS ===
+MODULE_DEFINE(0, 0x100, armv7_GIC, GIC_Install, NULL, NULL);
+Uint32 *gpGIC_DistributorBase;
+Uint32 *gpGIC_InterfaceBase;
+tPAddr gGIC_DistributorAddr;
+tPAddr gGIC_InterfaceAddr;
+tIRQ_Handler   gaIRQ_Handlers[N_IRQS];
+void   *gaIRQ_HandlerData[N_IRQS];
+
+// === CODE ===
+int GIC_Install(char **Arguments)
+{
+       // Realview PB
+       gGIC_InterfaceAddr   = 0x1e000000;
+       gGIC_DistributorAddr = 0x1e001000;
+
+       // Initialise
+       gpGIC_InterfaceBase = (void*)MM_MapHWPages(gGIC_InterfaceAddr, 1);
+       LOG("gpGIC_InterfaceBase = %p", gpGIC_InterfaceBase);
+       gpGIC_DistributorBase = (void*)MM_MapHWPages(gGIC_DistributorAddr, 1);
+       LOG("gpGIC_DistributorBase = %p", gpGIC_DistributorBase);
+
+       gpGIC_InterfaceBase[GICC_PMR] = 0xFF;   
+       gpGIC_InterfaceBase[GICC_CTLR] = 1;     // Enable CPU
+       gpGIC_DistributorBase[GICD_CTLR] = 1;   // Enable Distributor
+
+       gpIRQHandler = GIC_IRQHandler;
+
+       __asm__ __volatile__ ("cpsie if");      // Enable IRQs and FIQs
+
+       return MODULE_ERR_OK;
+}
+
+void GIC_IRQHandler(void)
+{
+       Uint32  num = gpGIC_InterfaceBase[GICC_IAR];
+//     Log_Debug("GIC", "IRQ 0x%x", num);
+       gaIRQ_Handlers[num]( num, gaIRQ_HandlerData[num] );
+       gpGIC_InterfaceBase[GICC_EOIR] = num;
+}
+
+int IRQ_AddHandler(int IRQ, tIRQ_Handler Handler, void *Ptr)
+{
+       if( IRQ < 0 || IRQ >= N_IRQS-32 ) {
+               return 1;
+       }
+       
+       LOG("IRQ = %i", IRQ);
+       IRQ += 32;      // 32 internal IRQs
+       LOG("IRQ = %i (after adjust)", IRQ);
+       LOG("mask = 0x%x", 1 << (IRQ & (31-1)));
+       gpGIC_DistributorBase[GICD_ISENABLER0+IRQ/32] = 1 << (IRQ & (32-1));
+       ((Uint8*)&gpGIC_DistributorBase[GICD_ITARGETSR0])[IRQ] = 1;
+       
+//     Log_Warning("GIC", "TODO: Implement IRQ_AddHandler");
+       
+       if( gaIRQ_Handlers[IRQ] )
+               return 2;
+       
+       gaIRQ_Handlers[IRQ] = Handler;
+       gaIRQ_HandlerData[IRQ] = Ptr;
+       
+       return 0;
+}
+