From 1577811d579f1aa8213c62f7bfac3e94f500a0d6 Mon Sep 17 00:00:00 2001
From: "Michael J. Chudobiak" <mjc@avtechpulse.com>
Date: Wed, 22 Aug 2012 10:42:05 -0400
Subject: fixes initialization of flash files

---
 bus.c | 58 +++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 43 insertions(+), 15 deletions(-)

(limited to 'bus.c')

diff --git a/bus.c b/bus.c
index da5243a..29958b0 100644
--- a/bus.c
+++ b/bus.c
@@ -58,6 +58,14 @@
 
 static int devmemfd = -1;
 
+static bool util_isbeaglebone()
+{
+	bool ret = false;
+	int fd = open("/sys/kernel/debug/omap_mux/board/core", O_RDONLY);
+	close(fd);
+	return fd > -1;
+}
+
 static void* util_mapmemoryblock(off_t offset, size_t len)
 {
 	devmemfd = open("/dev/mem", O_RDWR | O_SYNC);
@@ -192,7 +200,7 @@ static void gpmc_setup(int chipselect, int accesscycles, int size, bool enablecs
 		*(registers + displacement + GPMC_CONFIG3) = 0x0; // not using ADV so we can ignore this guy
 		*(registers + displacement + GPMC_CONFIG4) = (accesscycles << OEOFFTIME);
 		*(registers + displacement + GPMC_CONFIG5) = (accesscycles << RDACCESSTIME) | (accesscycles << WRCYCLETIME)
-		        | (accesscycles << RDCYCLETIME);
+		                | (accesscycles << RDCYCLETIME);
 		*(registers + displacement + GPMC_CONFIG6) = (accesscycles << WRACCESSTIME);
 		*(registers + displacement + GPMC_CONFIG7) = size << 8 | (enablecs ? 1 << 6 : 0) | baseaddress;
 
@@ -296,43 +304,63 @@ static unsigned bases[] = { GPIOPIN0BASE, GPIOPIN1BASE, GPIOPIN2BASE, GPIOPIN3BA
 static unsigned pins[] = { GPIOPIN0PIN, GPIOPIN1PIN, GPIOPIN2PIN, GPIOPIN3PIN, GPIOPIN4PIN, GPIOPIN5PIN };
 
 static volatile uint8_t* extbus;
+static bool isbb = false;
 
 void bus_init()
 {
-	gpmc_setup(0, GPMCACCESSTIME, GPMC_SIZE_16MB, true, 1);
 
-	extbus = (uint8_t*) util_mapmemoryblock(0x01000000, 0x100);
+	isbb = util_isbeaglebone();
+
+	if (!isbb) {
+		printf("This doesn't seem to be a beaglebone.. bus stuff disabled!\n");
+	}
 
-	//gpmc_printinfo();
+	if (isbb) {
+		gpmc_setup(0, GPMCACCESSTIME, GPMC_SIZE_16MB, true, 1);
 
-	int i;
-	for (i = 0; i < SIZEOFARRAY(bases); i++) {
-		gpio_export(bases[i], pins[i]);
-		gpio_changedirection(bases[i], pins[i], true);
+		extbus = (uint8_t*) util_mapmemoryblock(0x01000000, 0x100);
+
+		//gpmc_printinfo();
+
+		int i;
+		for (i = 0; i < SIZEOFARRAY(bases); i++) {
+			gpio_export(bases[i], pins[i]);
+			gpio_changedirection(bases[i], pins[i], true);
+		}
 	}
 }
 
 void bus_setpin(int pin, int value)
 {
-	gpio_writevalue(bases[pin], pins[pin], value & 0x1);
+	if (isbb) {
+		gpio_writevalue(bases[pin], pins[pin], value & 0x1);
+	}
 }
 
 void bus_writebyte(uint8_t address, uint8_t data)
 {
-	*(extbus + address) = data;
+	if (isbb) {
+		*(extbus + address) = data;
+	}
 }
 
 uint8_t bus_readbyte(uint8_t address)
 {
-	return *(extbus + address);
+	if (isbb) {
+		return *(extbus + address);
+	} else {
+		return 0;
+	}
 }
 
 void bus_shutdown()
 {
-	util_unmapmemoryblock((void*) extbus, 0x100);
-	int i;
-	for (i = 0; i < SIZEOFARRAY(bases); i++) {
-		gpio_unexport(bases[i], pins[i]);
+	if (isbb) {
+		util_unmapmemoryblock((void*) extbus, 0x100);
+		int i;
+		for (i = 0; i < SIZEOFARRAY(bases); i++) {
+			gpio_unexport(bases[i], pins[i]);
 
+		}
 	}
 }
-- 
cgit