summaryrefslogtreecommitdiff
path: root/board/gth/ee_access.c
diff options
context:
space:
mode:
Diffstat (limited to 'board/gth/ee_access.c')
-rw-r--r--board/gth/ee_access.c335
1 files changed, 0 insertions, 335 deletions
diff --git a/board/gth/ee_access.c b/board/gth/ee_access.c
deleted file mode 100644
index 2a33a0edd..000000000
--- a/board/gth/ee_access.c
+++ /dev/null
@@ -1,335 +0,0 @@
-/* Module for handling DALLAS DS2438, smart battery monitor
- Chip can store up to 40 bytes of user data in EEPROM,
- perform temp, voltage and current measurements.
- Chip also contains a unique serial number.
-
- Always read/write LSb first
-
- For documentaion, see data sheet for DS2438, 2438.pdf
-
- By Thomas.Lange@corelatus.com 001025 */
-
-#include <common.h>
-#include <config.h>
-#include <mpc8xx.h>
-
-#include <../board/gth/ee_dev.h>
-
-/* We dont have kernel functions */
-#define printk printf
-#define KERN_DEBUG
-#define KERN_ERR
-#define EIO 1
-
-static int Debug = 0;
-
-#ifndef TRUE
-#define TRUE 1
-#endif
-#ifndef FALSE
-#define FALSE 0
-#endif
-
-/*
- * lookup table ripped from DS app note 17, understanding and using
- * cyclic redundancy checks...
- */
-
-static u8 crc_lookup[256] = {
- 0, 94, 188, 226, 97, 63, 221, 131,
- 194, 156, 126, 32, 163, 253, 31, 65,
- 157, 195, 33, 127, 252, 162, 64, 30,
- 95, 1, 227, 189, 62, 96, 130, 220,
- 35, 125, 159, 193, 66, 28, 254, 160,
- 225, 191, 93, 3, 128, 222, 60, 98,
- 190, 224, 2, 92, 223, 129, 99, 61,
- 124, 34, 192, 158, 29, 67, 161, 255,
- 70, 24, 250, 164, 39, 121, 155, 197,
- 132, 218, 56, 102, 229, 187, 89, 7,
- 219, 133, 103, 57, 186, 228, 6, 88,
- 25, 71, 165, 251, 120, 38, 196, 154,
- 101, 59, 217, 135, 4, 90, 184, 230,
- 167, 249, 27, 69, 198, 152, 122, 36,
- 248, 166, 68, 26, 153, 199, 37, 123,
- 58, 100, 134, 216, 91, 5, 231, 185,
- 140, 210, 48, 110, 237, 179, 81, 15,
- 78, 16, 242, 172, 47, 113, 147, 205,
- 17, 79, 173, 243, 112, 46, 204, 146,
- 211, 141, 111, 49, 178, 236, 14, 80,
- 175, 241, 19, 77, 206, 144, 114, 44,
- 109, 51, 209, 143, 12, 82, 176, 238,
- 50, 108, 142, 208, 83, 13, 239, 177,
- 240, 174, 76, 18, 145, 207, 45, 115,
- 202, 148, 118, 40, 171, 245, 23, 73,
- 8, 86, 180, 234, 105, 55, 213, 139,
- 87, 9, 235, 181, 54, 104, 138, 212,
- 149, 203, 41, 119, 244, 170, 72, 22,
- 233, 183, 85, 11, 136, 214, 52, 106,
- 43, 117, 151, 201, 74, 20, 246, 168,
- 116, 42, 200, 150, 21, 75, 169, 247,
- 182, 232, 10, 84, 215, 137, 107, 53
-};
-
-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 ]);
-}
-
-int ee_crc_ok( u8 *Buffer, int Len, u8 Crc ){
- /* Check if the checksum for this buffer is correct */
- u8 Curr_crc=0;
- int i;
- u8 *Curr_byte = Buffer;
-
- for(i=0;i<Len;i++){
- Curr_crc = make_new_crc( Curr_crc, *Curr_byte);
- Curr_byte++;
- }
- E_DEBUG("Calculated CRC = 0x%x, read = 0x%x\n", Curr_crc, Crc);
-
- if(Curr_crc == Crc){
- /* Good */
- return(TRUE);
- }
- printk(KERN_ERR"EE checksum error, Calculated CRC = 0x%x, read = 0x%x\n",
- Curr_crc, Crc);
- return(FALSE);
-}
-
-static void
-set_idle(void){
- /* Send idle and keep start time
- Continous 1 is idle */
- WRITE_PORT(1);
-}
-
-static int
-do_reset(void){
- /* Release reset and verify that chip responds with presence pulse */
- int Retries = 0;
- while(Retries<5){
- udelay(RESET_LOW_TIME);
-
- /* 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){
- /* Ok, EEPROM is driving a 0 */
- E_DEBUG("Presence detected\n");
- if(Retries){
- E_DEBUG("Retries %d\n",Retries);
- }
- /* Make sure chip releases pin */
- udelay(PRESENCE_LOW_TIME);
- return 0;
- }
- Retries++;
- }
-
- 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
-read_byte(void){
- /* Read a single byte from EEPROM
- Read LSb first */
- int i;
- int Value;
- u8 Result=0;
-#ifndef CONFIG_SYS_IMMR
- u32 Flags;
-#endif
-
- E_DEBUG("Reading byte\n");
-
- for(i=0;i<8;i++){
- /* Small delay between pulses */
- udelay(1);
-
-#ifndef CONFIG_SYS_IMMR
- /* Disable irq */
- save_flags(Flags);
- cli();
-#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;
-
-#ifndef CONFIG_SYS_IMMR
- /* Enable irq */
- restore_flags(Flags);
-#endif
-
- /* Wait for chip to release pin */
- udelay(TOTAL_READ_LOW-READ_TIMEOUT);
-
- /* LSb first */
- Result|=Value<<i;
- }
-
- E_DEBUG("Read byte 0x%x\n",Result);
-
- return(Result);
-}
-
-static void
-write_byte(u8 Byte){
- /* Write a single byte to EEPROM
- Write LSb first */
- int i;
- int Value;
-#ifndef CONFIG_SYS_IMMR
- u32 Flags;
-#endif
-
- E_DEBUG("Writing byte 0x%x\n",Byte);
-
- for(i=0;i<8;i++){
- /* Small delay between pulses */
- udelay(1);
- Value = Byte&1;
-
-#ifndef CONFIG_SYS_IMMR
- /* Disable irq */
- save_flags(Flags);
- cli();
-#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 */
- udelay(WRITE_1_LOW);
- }
- else{
- /* Write a 0 */
- udelay(WRITE_0_LOW);
- }
-
- WRITE_PORT(1);
-
-#ifndef CONFIG_SYS_IMMR
- /* Enable irq */
- restore_flags(Flags);
-#endif
-
- if(Value)
- /* Wait for chip to read the 1 */
- udelay(TOTAL_WRITE_LOW-WRITE_1_LOW);
- Byte>>=1;
- }
-}
-
-int ee_do_command( u8 *Tx, int Tx_len, u8 *Rx, int Rx_len, int Send_skip ){
- /* Execute this command string, including
- giving reset and setting to idle after command
- 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_reset()){
- /* Failed! */
- return(-EIO);
- }
-
- if(Send_skip)
- /* Always send SKIP_ROM first to tell chip we are sending a command,
- except when we read out rom data for chip */
- write_byte(SKIP_ROM);
-
- /* Always have Tx data */
- for(i=0;i<Tx_len;i++){
- write_byte(Tx[i]);
- }
-
- if(Rx_len){
- for(i=0;i<Rx_len;i++){
- Rx[i]=read_byte();
- }
- }
-
- set_idle();
-
- E_DEBUG("Command done\n");
-
- return(0);
-}
-
-int ee_init_data(void){
- int i;
- u8 Tx[10];
- int tmp;
- volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
-
- while(0){
- tmp = 1-tmp;
- if(tmp)
- immap->im_ioport.iop_padat &= ~PA_FRONT_LED;
- else
- immap->im_ioport.iop_padat |= PA_FRONT_LED;
- udelay(1);
- }
-
- /* Set port to open drain to be able to read data from
- port without setting it to input */
- PORT_B_PAR &= ~PB_EEPROM;
- PORT_B_ODR |= PB_EEPROM;
- SET_PORT_B_OUTPUT(PB_EEPROM);
-
- /* Set idle mode */
- set_idle();
-
- /* 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;
- if(ee_do_command(Tx,2,NULL,0,TRUE)) return(-EIO);
- }
-
- /* Make sure chip doesnt store measurements in NVRAM */
- Tx[0]=WRITE_SCRATCHPAD;
- Tx[1]=0; /* Page */
- Tx[2]=9;
- if(ee_do_command(Tx,3,NULL,0,TRUE)) return(-EIO);
-
- Tx[0]=COPY_SCRATCHPAD;
- if(ee_do_command(Tx,2,NULL,0,TRUE)) return(-EIO);
-
- /* FIXME check status bit instead
- Could take 10 ms to store in EEPROM */
- for(i=0;i<10;i++){
- udelay(1000);
- }
-
- return(0);
-}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 16:53:00 +0000