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authorWolfgang Denk <wd@pollux.denx.de>2006-07-19 13:50:38 +0200
committerWolfgang Denk <wd@pollux.denx.de>2006-07-19 13:50:38 +0200
commitb87dfd2854809ddcf4be54d772752e7ed137386f (patch)
treed10a0446c375a2961223f12f553a51422bff553a /board/gth2/ee_access.c
parentf3e06df7e89a1b6ff6701d523b4beea6e3fa5159 (diff)
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Add support for TB5200 board
The TB5200 ("Tinybox") is a small baseboard for the TQM5200 module integrated in a little aluminium case. Patch by Martin Krause, 8 Jun 2006 Some code cleanup
Diffstat (limited to 'board/gth2/ee_access.c')
-rw-r--r--board/gth2/ee_access.c82
1 files changed, 41 insertions, 41 deletions
diff --git a/board/gth2/ee_access.c b/board/gth2/ee_access.c
index e293139..d4798c4 100644
--- a/board/gth2/ee_access.c
+++ b/board/gth2/ee_access.c
@@ -8,7 +8,7 @@
For documentaion, see data sheet for DS2438, 2438.pdf
By Thomas.Lange@corelatus.com 001025
-
+
Copyright (C) 2000-2005 Corelatus AB */
/* This program is free software; you can redistribute it and/or
@@ -105,7 +105,7 @@ static u8 make_new_crc( u8 Old_crc, u8 New_value ){
/* Compute a new checksum with new byte, using previous checksum as input
See DS app note 17, understanding and using cyclic redundancy checks...
Also see DS2438, page 11 */
- return( crc_lookup[Old_crc ^ New_value ]);
+ return( crc_lookup[Old_crc ^ New_value ]);
}
int ee_crc_ok( u8 *Buffer, int Len, u8 Crc ){
@@ -119,16 +119,16 @@ int ee_crc_ok( u8 *Buffer, int Len, u8 Crc ){
Curr_byte++;
}
E_DEBUG("Calculated CRC = 0x%x, read = 0x%x\n", Curr_crc, Crc);
-
+
if(Curr_crc == Crc){
- /* Good */
+ /* Good */
return(TRUE);
}
printk(KERN_ERR"EE checksum error, Calculated CRC = 0x%x, read = 0x%x\n", Curr_crc, Crc);
return(FALSE);
}
-static void
+static void
set_idle(void){
/* Send idle and keep start time
Continous 1 is idle */
@@ -136,7 +136,7 @@ set_idle(void){
}
-static int
+static int
do_cpu_reset(void){
/* Release reset and verify that chip responds with presence pulse */
int Retries=0;
@@ -146,10 +146,10 @@ do_cpu_reset(void){
/* Send reset */
WRITE_PORT(0);
udelay(RESET_LOW_TIME);
-
+
/* Release reset */
WRITE_PORT(1);
-
+
/* Wait for EEPROM to drive output */
udelay(PRESENCE_TIMEOUT);
if(!READ_PORT){
@@ -166,17 +166,17 @@ do_cpu_reset(void){
}
printk(KERN_ERR"eeprom did not respond when releasing reset\n");
-
+
/* Make sure chip releases pin */
udelay(PRESENCE_LOW_TIME);
/* Set to idle again */
set_idle();
-
+
return(-EIO);
}
-static u8
+static u8
read_cpu_byte(void){
/* Read a single byte from EEPROM
Read LSb first */
@@ -186,36 +186,36 @@ read_cpu_byte(void){
u32 Flags;
E_DEBUG("Reading byte\n");
-
+
for(i=0;i<8;i++){
/* Small delay between pulses */
udelay(1);
-#ifdef __KERNEL__
- /* Disable irq */
+#ifdef __KERNEL__
+ /* Disable irq */
save_flags(Flags);
cli();
-#endif
+#endif
/* Pull down pin short time to start read
See page 26 in data sheet */
-
+
WRITE_PORT(0);
udelay(READ_LOW);
WRITE_PORT(1);
-
+
/* Wait for chip to drive pin */
udelay(READ_TIMEOUT);
-
+
Value = READ_PORT;
if(Value)
Value=1;
#ifdef __KERNEL__
- /* Enable irq */
+ /* Enable irq */
restore_flags(Flags);
#endif
-
+
/* Wait for chip to release pin */
udelay(TOTAL_READ_LOW-READ_TIMEOUT);
@@ -230,30 +230,30 @@ read_cpu_byte(void){
return(Result);
}
-static void
+static void
write_cpu_byte(u8 Byte){
/* Write a single byte to EEPROM
Write LSb first */
int i;
int Value;
u32 Flags;
-
+
E_DEBUG("Writing byte 0x%x\n",Byte);
-
+
for(i=0;i<8;i++){
/* Small delay between pulses */
udelay(1);
Value = Byte&1;
-
+
#ifdef __KERNEL__
- /* Disable irq */
+ /* Disable irq */
save_flags(Flags);
cli();
-#endif
+#endif
/* Pull down pin short time for a 1, long time for a 0
See page 26 in data sheet */
-
+
WRITE_PORT(0);
if(Value){
/* Write a 1 */
@@ -267,54 +267,54 @@ write_cpu_byte(u8 Byte){
WRITE_PORT(1);
#ifdef __KERNEL__
- /* Enable irq */
+ /* Enable irq */
restore_flags(Flags);
#endif
if(Value)
/* Wait for chip to read the 1 */
udelay(TOTAL_WRITE_LOW-WRITE_1_LOW);
-
+
/* E_DEBUG("Wrote %d\n",Value); */
Byte>>=1;
}
}
int ee_do_cpu_command( u8 *Tx, int Tx_len, u8 *Rx, int Rx_len, int Send_skip ){
- /* Execute this command string, including
+ /* Execute this command string, including
giving reset and setting to idle after command
- if Rx_len is set, we read out data from EEPROM */
+ if Rx_len is set, we read out data from EEPROM */
int i;
E_DEBUG("Command, Tx_len %d, Rx_len %d\n", Tx_len, Rx_len );
-
+
if(do_cpu_reset()){
/* Failed! */
return(-EIO);
}
if(Send_skip)
- /* Always send SKIP_ROM first to tell chip we are sending a command,
+ /* Always send SKIP_ROM first to tell chip we are sending a command,
except when we read out rom data for chip */
write_cpu_byte(SKIP_ROM);
-
+
/* Always have Tx data */
for(i=0;i<Tx_len;i++){
write_cpu_byte(Tx[i]);
}
-
+
if(Rx_len){
for(i=0;i<Rx_len;i++){
Rx[i]=read_cpu_byte();
}
}
-
+
set_idle();
E_DEBUG("Command done\n");
return(0);
-}
+}
int ee_init_cpu_data(void){
int i;
@@ -323,7 +323,7 @@ int ee_init_cpu_data(void){
/* Leave it floting since altera is driving the same pin */
set_idle();
- /* Copy all User EEPROM data to scratchpad */
+ /* Copy all User EEPROM data to scratchpad */
for(i=0;i<USER_PAGES;i++){
Tx[0]=RECALL_MEMORY;
Tx[1]=EE_USER_PAGE_0+i;
@@ -332,16 +332,16 @@ int ee_init_cpu_data(void){
/* Make sure chip doesnt store measurements in NVRAM */
Tx[0]=WRITE_SCRATCHPAD;
- Tx[1]=0; /* Page */
+ Tx[1]=0; /* Page */
Tx[2]=9;
if(ee_do_cpu_command(Tx,3,NULL,0,TRUE)) return(-EIO);
Tx[0]=COPY_SCRATCHPAD;
if(ee_do_cpu_command(Tx,2,NULL,0,TRUE)) return(-EIO);
-
+
for(i=0;i<10;i++){
udelay(1000);
}
-
+
return(0);
}