ARM: Add I/O devices for booting linux

--HG--
rename : src/dev/arm/Versatile.py => src/dev/arm/RealView.py
rename : src/dev/arm/versatile.cc => src/dev/arm/realview.cc
rename : src/dev/arm/versatile.hh => src/dev/arm/realview.hh

1 files changed, 292 insertions, 0 deletions

diff --git a/src/dev/arm/pl011.cc b/src/dev/arm/pl011.cc
new file mode 100644
index 000000000..2afc9977d
--- /dev/null
+++ b/src/dev/arm/pl011.cc
@@ -0,0 +1,292 @@
+/*
+ * Copyright (c) 2010 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * Copyright (c) 2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ */
+
+#include "base/trace.hh"
+#include "dev/arm/gic.hh"
+#include "dev/arm/pl011.hh"
+#include "dev/terminal.hh"
+#include "mem/packet.hh"
+#include "mem/packet_access.hh"
+#include "sim/sim_exit.hh"
+
+Pl011::Pl011(const Params *p)
+    : Uart(p), control(0x300), fbrd(0), ibrd(0), lcrh(0), ifls(0x12), imsc(0),
+      rawInt(0), maskInt(0), intNum(p->int_num), gic(p->gic),
+      endOnEOT(p->end_on_eot), intDelay(p->int_delay), intEvent(this)
+{
+    pioSize = 0xfff;
+}
+
+Tick
+Pl011::read(PacketPtr pkt)
+{
+    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+
+    Addr daddr = pkt->getAddr() - pioAddr;
+    pkt->allocate();
+
+    DPRINTF(Uart, " read register %#x size=%d\n", daddr, pkt->getSize());
+
+    // use a temporary data since the uart registers are read/written with
+    // different size operations
+    //
+    uint32_t data = 0;
+
+    switch(daddr) {
+      case UART_DR:
+        data = 0;
+        if (term->dataAvailable())
+            data = term->in();
+        break;
+      case UART_FR:
+        // For now we're infintely fast, so TX is never full, always empty,
+        // always clear to send
+        data = UART_FR_TXFE | UART_FR_CTS;
+        if (!term->dataAvailable())
+            data |= UART_FR_RXFE;
+        DPRINTF(Uart, "Reading FR register as %#x rawInt=0x%x imsc=0x%x maskInt=0x%x\n",
+                data, rawInt, imsc, maskInt);
+        break;
+      case UART_CR:
+        data = control;
+        break;
+      case UART_IBRD:
+        data = ibrd;
+        break;
+      case UART_FBRD:
+        data = fbrd;
+        break;
+      case UART_LCRH:
+        data = lcrh;
+        break;
+      case UART_IFLS:
+        data = ifls;
+        break;
+      case UART_IMSC:
+        data = imsc;
+        break;
+      case UART_RIS:
+        data = rawInt;
+        DPRINTF(Uart, "Reading Raw Int status as 0x%x\n", rawInt);
+        break;
+      case UART_MIS:
+        DPRINTF(Uart, "Reading Masked Int status as 0x%x\n", rawInt);
+        data = maskInt;
+        break;
+      default:
+        if (daddr >= UART_PER_ID0 && daddr <= UART_CEL_ID3) {
+            // AMBA ID information
+            int byte;
+            byte = (daddr - UART_PER_ID0) << 1;
+            DPRINTF(AMBA, "--daddr=%#x shift=%d val=%#x\n", daddr, byte,
+                (ULL(0xb105f00d00341011) >> byte) & 0xFF);
+            data = (ULL(0xb105f00d00341011) >> byte) & 0xFF;
+            break;
+        }
+        panic("Tried to read PL011 at offset %#x that doesn't exist\n", daddr);
+        break;
+    }
+
+    switch(pkt->getSize()) {
+      case 1:
+        pkt->set<uint8_t>(data);
+        break;
+      case 2:
+        pkt->set<uint16_t>(data);
+        break;
+      case 4:
+        pkt->set<uint32_t>(data);
+        break;
+      default:
+        panic("Uart read size too big?\n");
+        break;
+    }
+
+
+    pkt->makeAtomicResponse();
+    return pioDelay;
+}
+
+Tick
+Pl011::write(PacketPtr pkt)
+{
+
+    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+
+    Addr daddr = pkt->getAddr() - pioAddr;
+
+    DPRINTF(Uart, " write register %#x value %#x size=%d\n", daddr,
+            pkt->get<uint8_t>(), pkt->getSize());
+
+    // use a temporary data since the uart registers are read/written with
+    // different size operations
+    //
+    uint32_t data = 0;
+
+    switch(pkt->getSize()) {
+      case 1:
+        data = pkt->get<uint8_t>();
+        break;
+      case 2:
+        data = pkt->get<uint16_t>();
+        break;
+      case 4:
+        data = pkt->get<uint32_t>();
+        break;
+      default:
+        panic("Uart write size too big?\n");
+        break;
+    }
+
+
+    switch (daddr) {
+        case UART_DR:
+          if ((data & 0xFF) == 0x04 && endOnEOT)
+            exitSimLoop("UART received EOT", 0);
+
+        term->out(data & 0xFF);
+
+        if (imsc.txim) {
+            DPRINTF(Uart, "TX int enabled, scheduling interruptt\n");
+            rawInt.txim = 1;
+            if (!intEvent.scheduled())
+                schedule(intEvent, curTick + intDelay);
+        }
+
+        break;
+      case UART_CR:
+        control = data;
+        break;
+      case UART_IBRD:
+        ibrd = data;
+        break;
+      case UART_FBRD:
+        fbrd = data;
+        break;
+      case UART_LCRH:
+        lcrh = data;
+        break;
+      case UART_IFLS:
+        ifls = data;
+        break;
+      case UART_IMSC:
+        imsc = data;
+
+        if (imsc.rimim || imsc.ctsmim || imsc.dcdmim || imsc.dsrmim
+             || imsc.feim || imsc.peim || imsc.beim || imsc.oeim || imsc.rsvd)
+            panic("Unknown interrupt enabled\n");
+
+        if (imsc.txim) {
+            DPRINTF(Uart, "Writing to IMSC: TX int enabled, scheduling interruptt\n");
+            rawInt.txim = 1;
+            if (!intEvent.scheduled())
+                schedule(intEvent, curTick + intDelay);
+        }
+
+        break;
+
+      case UART_ICR:
+        DPRINTF(Uart, "Clearing interrupts 0x%x\n", data);
+        rawInt = rawInt & ~data;
+        maskInt = rawInt & imsc;
+
+        DPRINTF(Uart, " -- Masked interrupts 0x%x\n", maskInt);
+
+        if (!maskInt)
+            gic->clearInt(intNum);
+
+        break;
+      default:
+        panic("Tried to write PL011 at offset %#x that doesn't exist\n", daddr);
+        break;
+    }
+    pkt->makeAtomicResponse();
+    return pioDelay;
+}
+
+void
+Pl011::dataAvailable()
+{
+    /*@todo ignore the fifo, just say we have data now
+     * We might want to fix this, or we might not care */
+    rawInt.rxim = 1;
+    rawInt.rtim = 1;
+
+    DPRINTF(Uart, "Data available, scheduling interrupt\n");
+
+    if (!intEvent.scheduled())
+        schedule(intEvent, curTick + intDelay);
+}
+
+void
+Pl011::generateInterrupt()
+{
+    DPRINTF(Uart, "Generate Interrupt: imsc=0x%x rawInt=0x%x maskInt=0x%x\n",
+            imsc, rawInt, maskInt);
+    maskInt = imsc & rawInt;
+
+    if (maskInt.rxim || maskInt.rtim || maskInt.txim) {
+        gic->sendInt(intNum);
+        DPRINTF(Uart, " -- Generated\n");
+    }
+
+}
+
+
+
+void
+Pl011::serialize(std::ostream &os)
+{
+    panic("Need to implement serialization\n");
+}
+
+void
+Pl011::unserialize(Checkpoint *cp, const std::string &section)
+{
+    panic("Need to implement serialization\n");
+}
+
+Pl011 *
+Pl011Params::create()
+{
+    return new Pl011(this);
+}