From 49c7fc8a1c06912caa89664af85801032a7bb7f8 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Thu, 26 Oct 2023 01:35:28 +0200
Subject: initially add simple lt_bus

---
 src/lt_bus.cc | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/lt_bus.cc

(limited to 'src/lt_bus.cc')

diff --git a/src/lt_bus.cc b/src/lt_bus.cc
new file mode 100644
index 0000000..078a8d8
--- /dev/null
+++ b/src/lt_bus.cc
@@ -0,0 +1,85 @@
+#include "models/lt_bus.h"
+#include "utils.h"
+
+#include <tlm_utils/simple_initiator_socket.h>
+#include <tlm_utils/simple_target_socket.h>
+
+// -- TARGET -------------------------------------------------------------------
+
+struct target : public sc_core::sc_module {
+  explicit target(sc_core::sc_module_name nm) : sc_module(std::move(nm)) {
+    p_sock.register_b_transport(this, &target::b_transport);
+  }
+
+  tlm_utils::simple_target_socket<target> p_sock{"sock"};
+
+ private:
+  void b_transport(tlm::tlm_generic_payload& tx, sc_core::sc_time& t) {
+    LOGM("transport 0x%llx w: %d r: %d", tx.get_address(), tx.is_write(),
+         tx.is_read());
+    tx.set_response_status(tlm::TLM_OK_RESPONSE);
+  }
+};
+
+// -- INITIATOR ----------------------------------------------------------------
+
+struct initiator : public sc_core::sc_module {
+  SC_HAS_PROCESS(initiator);
+
+  explicit initiator(sc_core::sc_module_name nm) : sc_module(std::move(nm)) {
+    SC_THREAD(run);
+  }
+
+  tlm_utils::simple_initiator_socket<initiator> p_sock{"sock"};
+
+ private:
+  void send_tx(tlm::tlm_command cmd, std::uint64_t addr) {
+    unsigned char data[4];
+    tlm::tlm_generic_payload tx;
+    tx.set_command(cmd);
+    tx.set_address(addr);
+    tx.set_data_ptr(data);
+    tx.set_data_length(sizeof(data));
+    tx.set_byte_enable_ptr(nullptr);
+    tx.set_byte_enable_length(0);
+    tx.set_response_status(tlm::TLM_INCOMPLETE_RESPONSE);
+    tx.set_dmi_allowed(false);
+
+    sc_core::sc_time t;
+    p_sock->b_transport(tx, t);
+
+    LOGM("ACCESS @%lx ok: %d (%s)", addr, tx.is_response_ok(),
+         tx.get_response_string().c_str());
+  }
+
+  void run() {
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x1000);
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x3000);
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x4000);
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x9000);
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x80fc);
+    send_tx(tlm::TLM_WRITE_COMMAND, 0x80fd);
+  }
+};
+
+// -- SC_MAIN ------------------------------------------------------------------
+
+extern "C" int sc_main(int, char*[]) {
+  lt_bus bus{"bus"};
+
+  target target1{"target1"};
+  target target2{"target2"};
+  target target3{"target3"};
+
+  initiator init1{"init1"};
+
+  bus.attach_target(target2.p_sock, 0x4000, 0x4fff);
+  bus.attach_target(target1.p_sock, 0x0000, 0x3fff);
+  bus.attach_target(target3.p_sock, 0x8000, 0x80ff);
+
+  bus.attach_initiator(init1.p_sock);
+
+  sc_core::sc_start();
+
+  return 0;
+}
-- 
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