From e6535b546cfee0ff901899ac31d840da0ff564fd Mon Sep 17 00:00:00 2001
From: meepingsnesroms <guicrith@gmail.com>
Date: Tue, 20 Aug 2019 11:45:45 -0700
Subject: [PATCH] Add chip select and reset lines for TSC2101

---
 src/emulator.c           |  2 +-
 src/pxa260/pxa260_GPIO.c | 36 +++++++++++++++++++++++++++++++++++-
 src/tsc2101.c            |  9 +++++++--
 src/tsc2101.h            |  2 +-
 4 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/src/emulator.c b/src/emulator.c
index 36b2b4d..4bf661a 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -244,7 +244,7 @@ void emulatorSoftReset(void){
       palmClockMultiplier = 1.00;
       pxa260Reset();
       tps65010Reset();
-      tsc2101Reset();
+      tsc2101Reset(true);
       w86l488Reset();
       sandboxReset();
    }
diff --git a/src/pxa260/pxa260_GPIO.c b/src/pxa260/pxa260_GPIO.c
index 111f58c..8e2f3e0 100644
--- a/src/pxa260/pxa260_GPIO.c
+++ b/src/pxa260/pxa260_GPIO.c
@@ -1,7 +1,32 @@
 #include "pxa260_GPIO.h"
 #include "pxa260_mem.h"
+#include "../tsc2101.h"
+#include "../emulator.h"
 
 
+static void pxa260gpioOnOutputPinUpdated(Pxa260gpio* gpio, UInt8 gpioNum){
+   //the pin value is not sent to this function because it is usually not needed and can be fetched with pxa260gpioGetState
+
+   debugLog("PXA260 GPIO %d set:%d\n", gpioNum, pxa260gpioGetState(gpio, gpioNum));
+
+   switch(gpioNum){
+      case 24:
+         //TSC2101 chip select
+         tsc2101SetChipSelect(!!pxa260gpioGetState(gpio, gpioNum));
+         break;
+
+      case 40:
+         //TSC2101 reset
+         if(pxa260gpioGetState(gpio, gpioNum) == PXA260_GPIO_LOW)
+            tsc2101Reset(false);
+         break;
+
+      default:
+         //debugLog("Unimplimented PXA260 GPIO %d set:%d\n", gpioNum, pxa260gpioGetState(gpio, gpioNum));
+         break;
+   }
+}
+
 static void pxa260gpioPrvRecalcValues(Pxa260gpio* gpio, UInt32 which){
 
    UInt8 i;
@@ -20,8 +45,17 @@ static void pxa260gpioPrvRecalcValues(Pxa260gpio* gpio, UInt32 which){
    if (newVal != oldVal) {
       UInt32 wentHi = newVal &~ oldVal;
       UInt32 wentLo = oldVal &~ newVal;
+      UInt32 outputChanged = (wentHi | wentLo) & gpio->dirs[which];
 
       gpio->detStatus[which] |= (wentHi & gpio->riseDet[which]) | (wentLo & gpio->fallDet[which]);
+
+      if(outputChanged){
+         UInt8 index;
+
+         for(index = 0; index < 32; index++)
+            if(outputChanged & 1UL << index)
+               pxa260gpioOnOutputPinUpdated(gpio, which * 32 + index);
+      }
    }
 }
 
@@ -106,7 +140,7 @@ Boolean pxa260gpioPrvMemAccessF(void* userData, UInt32 pa, UInt8 size, Boolean w
 			case 25:
 			case 26:
             gpio->AFRs[pa - 21] = val;
-            //pa = (pa - 21) / 2;
+            pa = (pa - 21) / 2;
 				goto recalc;
 		}
 		
diff --git a/src/tsc2101.c b/src/tsc2101.c
index 2d245a0..6459f8f 100644
--- a/src/tsc2101.c
+++ b/src/tsc2101.c
@@ -74,7 +74,7 @@ static void tsc2101RegisterWrite(uint8_t page, uint8_t address, uint16_t value){
    }
 }
 
-void tsc2101Reset(void){
+void tsc2101Reset(bool isBoot){
    memset(tsc2101Registers, 0x00, sizeof(tsc2101Registers));
    tsc2101CurrentWord = 0x0000;
    tsc2101CurrentWordBitsRemaining = 16;
@@ -82,7 +82,9 @@ void tsc2101Reset(void){
    tsc2101CurrentRegister = 0;
    tsc2101CommandFinished = false;
    tsc2101Read = false;
-   tsc2101ChipSelect = true;
+
+   if(isBoot)
+      tsc2101ChipSelect = true;
 
    //TODO: need to add all the registers here
    tsc2101Registers[TOUCH_CONTROL_STATUS] = 0x8000;
@@ -111,6 +113,9 @@ void tsc2101SetChipSelect(bool value){
 bool tsc2101ExchangeBit(bool bit){
    bool output = true;//TODO: SPI return value is usualy true but this is unverified
 
+   if(tsc2101ChipSelect)
+      return true;
+
    if(!tsc2101Read){
       tsc2101CurrentWord <<= 1;
       tsc2101CurrentWord |= bit;
diff --git a/src/tsc2101.h b/src/tsc2101.h
index c841f8a..ccf51e3 100644
--- a/src/tsc2101.h
+++ b/src/tsc2101.h
@@ -4,7 +4,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-void tsc2101Reset(void);
+void tsc2101Reset(bool isBoot);
 uint32_t tsc2101StateSize(void);
 void tsc2101SaveState(uint8_t* data);
 void tsc2101LoadState(uint8_t* data);