From e2b698429fed9c16fb42bd554e712ca9079c94f6 Mon Sep 17 00:00:00 2001
From: hap <happppp@users.noreply.github.com>
Date: Tue, 7 Apr 2020 21:54:29 +0200
Subject: [PATCH] pla: allow reparsing after device started (nw)

---
 src/devices/machine/pla.cpp | 21 +++++++++++++++------
 src/devices/machine/pla.h   |  3 ++-
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/devices/machine/pla.cpp b/src/devices/machine/pla.cpp
index 44db6a4ed10..7ad690b11cd 100644
--- a/src/devices/machine/pla.cpp
+++ b/src/devices/machine/pla.cpp
@@ -72,21 +72,29 @@ void pla_device::device_start()
 		m_input_mask = ((uint64_t)1 << m_inputs) - 1;
 	m_input_mask = ((uint64_t)m_input_mask << 32) | m_input_mask;
 
-	// parse fusemap
-	parse_fusemap();
+	m_cache_size = 1 << ((m_inputs > MAX_CACHE_BITS) ? MAX_CACHE_BITS : m_inputs);
+	m_cache.resize(m_cache_size);
+
+	reinit();
+}
+
+bool pla_device::reinit()
+{
+	int result = parse_fusemap();
 
 	// initialize cache
 	m_cache2_ptr = 0;
 	for (auto & elem : m_cache2)
 		elem = 0x80000000;
 
+	int csize = m_cache_size;
 	m_cache_size = 0;
-	int csize = 1 << ((m_inputs > MAX_CACHE_BITS) ? MAX_CACHE_BITS : m_inputs);
-	m_cache.resize(csize);
 	for (int i = 0; i < csize; i++)
 		m_cache[i] = read(i);
 
 	m_cache_size = csize;
+
+	return result == JEDERR_NONE;
 }
 
 
@@ -94,7 +102,7 @@ void pla_device::device_start()
 //  parse_fusemap -
 //-------------------------------------------------
 
-void pla_device::parse_fusemap()
+int pla_device::parse_fusemap()
 {
 	jed_data jed;
 	int result = JEDERR_NONE;
@@ -120,7 +128,7 @@ void pla_device::parse_fusemap()
 		}
 
 		logerror("%s PLA parse error %d!\n", tag(), result);
-		return;
+		return result;
 	}
 
 	// parse it
@@ -174,6 +182,7 @@ void pla_device::parse_fusemap()
 	m_xor <<= 32;
 
 	LOGMASKED(LOG_TERMS, "F ^= %0*X\n", (m_outputs + 3) / 4, m_xor >> 32);
+	return result;
 }
 
 
diff --git a/src/devices/machine/pla.h b/src/devices/machine/pla.h
index b614a968b36..548ab4bf16b 100644
--- a/src/devices/machine/pla.h
+++ b/src/devices/machine/pla.h
@@ -69,6 +69,7 @@ public:
 	uint32_t outputs() { return m_outputs; }
 
 	uint32_t read(uint32_t input);
+	bool reinit();
 
 protected:
 	// device-level overrides
@@ -79,7 +80,7 @@ private:
 	static constexpr unsigned MAX_CACHE_BITS  = 20;
 	static constexpr unsigned CACHE2_SIZE     = 8;
 
-	void parse_fusemap();
+	int parse_fusemap();
 
 	required_memory_region m_region;