From f9f4a7498611082079ae4acd2d421a857cab30d8 Mon Sep 17 00:00:00 2001
From: Ali Saidi <saidi@eecs.umich.edu>
Date: Thu, 22 Jan 2004 19:02:07 -0500
Subject: added the 8254 programmable interval timer

--HG--
extra : convert_revision : 6a111db98c05a3dd692c757611c3eb9c8cfdd32f
---
 dev/tsunami_io.cc | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 109 insertions(+), 4 deletions(-)

(limited to 'dev/tsunami_io.cc')

diff --git a/dev/tsunami_io.cc b/dev/tsunami_io.cc
index d5f2af960..eb0b9ae91 100644
--- a/dev/tsunami_io.cc
+++ b/dev/tsunami_io.cc
@@ -23,11 +23,56 @@
 
 using namespace std;
 
+TsunamiIO::ClockEvent::ClockEvent()
+    : Event(&mainEventQueue)
+{
+    DPRINTF(Tsunami, "Clock Event Initilizing\n");
+    mode = 0;
+}
+
+void
+TsunamiIO::ClockEvent::process()
+{
+    DPRINTF(Tsunami, "Timer Interrupt\n");
+    if (mode == 0)
+       status = 0x20; // set bit that linux is looking for
+    else
+        schedule(curTick + interval);
+}
+
+void
+TsunamiIO::ClockEvent::Program(int count)
+{
+    DPRINTF(Tsunami, "Timer set to curTick + %d\n", count);
+    interval = count * ticksPerSecond/1193180UL; // should be count * (cpufreq/pitfreq)
+    schedule(curTick + interval);
+    status = 0;
+}
+
+const char *
+TsunamiIO::ClockEvent::description()
+{
+    return "tsunami 8254 Interval timer";
+}
+
+void
+TsunamiIO::ClockEvent::ChangeMode(uint8_t md)
+{
+    mode = md;
+}
+
+uint8_t
+TsunamiIO::ClockEvent::Status()
+{
+    return status;
+}
+
+
 TsunamiIO::TsunamiIO(const string &name, /*Tsunami *t,*/
                        Addr addr, Addr mask, MemoryController *mmu)
     : MmapDevice(name, addr, mask, mmu)/*, tsunami(t) */
 {
-
+    timerData = 0;
 }
 
 Fault
@@ -36,11 +81,26 @@ TsunamiIO::read(MemReqPtr req, uint8_t *data)
     DPRINTF(Tsunami, "io read  va=%#x size=%d IOPorrt=%#x\n",
             req->vaddr, req->size, req->vaddr & 0xfff);
 
- //   Addr daddr = (req->paddr & addr_mask) >> 6;
+    Addr daddr = (req->paddr & addr_mask);
 //    ExecContext *xc = req->xc;
 //    int cpuid = xc->cpu_id;
+
+    switch(req->size) {
+        case sizeof(uint8_t):
+            switch(daddr) {
+                case TSDEV_TMR_CTL:
+                    *(uint8_t*)data = timer2.Status();
+                    return No_Fault;
+                default:
+                    panic("I/O Read - va%#x size %d\n", req->vaddr, req->size);
+            }
+        case sizeof(uint16_t):
+        case sizeof(uint32_t):
+        case sizeof(uint64_t):
+        default:
+            panic("I/O Read - invalid size - va %#x size %d\n", req->vaddr, req->size);
+    }
      panic("I/O Read - va%#x size %d\n", req->vaddr, req->size);
-   // *(uint64_t*)data = 0x00;
 
     return No_Fault;
 }
@@ -75,7 +135,52 @@ TsunamiIO::write(MemReqPtr req, const uint8_t *data)
                 case TSDEV_DMA1_MASK:
                 case TSDEV_DMA2_MASK:
                     return No_Fault;
-                default:
+                case TSDEV_TMR_CTL:
+                    return No_Fault;
+                case TSDEV_TMR2_CTL:
+                    if ((*(uint8_t*)data & 0x30) != 0x30)
+                        panic("Only L/M write supported\n");
+
+                    switch(*(uint8_t*)data >> 6) {
+                        case 0:
+                            timer0.ChangeMode((*(uint8_t*)data & 0xF) >> 1);
+                            break;
+                        case 1:
+                            timer1.ChangeMode((*(uint8_t*)data & 0xF) >> 1);
+                            break;
+                        case 2:
+                            timer2.ChangeMode((*(uint8_t*)data & 0xF) >> 1);
+                            break;
+                        case 3:
+                        default:
+                            panic("Read Back Command not implemented\n");
+                    }
+                    return No_Fault;
+                case TSDEV_TMR2_DATA:
+                        /* two writes before we actually start the Timer
+                           so I set a flag in the timerData */
+                        if(timerData & 0x1000) {
+                            timerData &= 0x1000;
+                            timerData += *(uint8_t*)data << 8;
+                            timer2.Program(timerData);
+                        } else {
+                            timerData = *(uint8_t*)data;
+                            timerData |= 0x1000;
+                        }
+                        return No_Fault;
+                case TSDEV_TMR0_DATA:
+                        /* two writes before we actually start the Timer
+                           so I set a flag in the timerData */
+                        if(timerData & 0x1000) {
+                            timerData &= 0x1000;
+                            timerData += *(uint8_t*)data << 8;
+                            timer0.Program(timerData);
+                        } else {
+                            timerData = *(uint8_t*)data;
+                            timerData |= 0x1000;
+                        }
+                        return No_Fault;
+                 default:
                     panic("I/O Write - va%#x size %d\n", req->vaddr, req->size);
             }
         case sizeof(uint16_t):
-- 
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