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/*
* Interface for the 93C46/26/06 serial eeprom parts.
*
* Copyright (c) 1995 Daniel M. Eischen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Absolutely no warranty of function or purpose is made by the author
* Daniel M. Eischen.
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id$
*/
/*
* The instruction set of the 93C46/26/06 chips are as follows:
*
* Start OP
* Function Bit Code Address Data Description
* -------------------------------------------------------------------
* READ 1 10 A5 - A0 Reads data stored in memory,
* starting at specified address
* EWEN 1 00 11XXXX Write enable must preceed
* all programming modes
* ERASE 1 11 A5 - A0 Erase register A5A4A3A2A1A0
* WRITE 1 01 A5 - A0 D15 - D0 Writes register
* ERAL 1 00 10XXXX Erase all registers
* WRAL 1 00 01XXXX D15 - D0 Writes to all registers
* EWDS 1 00 00XXXX Disables all programming
* instructions
* *Note: A value of X for address is a don't care condition.
*
* The 93C46 has a four wire interface: clock, chip select, data in, and
* data out. In order to perform one of the above functions, you need
* to enable the chip select for a clock period (typically a minimum of
* 1 usec, with the clock high and low a minimum of 750 and 250 nsec
* respectively. While the chip select remains high, you can clock in
* the instructions (above) starting with the start bit, followed by the
* OP code, Address, and Data (if needed). For the READ instruction, the
* requested 16-bit register contents is read from the data out line but
* is preceded by an initial zero (leading 0, followed by 16-bits, MSB
* first). The clock cycling from low to high initiates the next data
* bit to be sent from the chip.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/clock.h>
#include <i386/scsi/93cx6.h>
/*
* Right now, we only have to read the SEEPROM. But we make it easier to
* add other 93Cx6 functions.
*/
struct seeprom_cmd {
unsigned char len;
unsigned char bits[3];
} seeprom_read = {3, {1, 1, 0}};
/*
* Wait for the SEERDY to go high; about 800 ns.
*/
#define CLOCK_PULSE(p, rdy) \
while ((inb(p) & rdy) == 0) { \
; /* Do nothing */ \
}
/*
* Read the serial EEPROM and returns 1 if successful and 0 if
* not successful.
*/
int read_seeprom (u_long offset,
u_short *buf,
int count,
u_short CS, /* chip select */
u_short CK, /* clock */
u_short DO, /* data out */
u_short DI, /* data in */
u_short RDY, /* ready */
u_short MS /* mode select */)
{
int i = 0, k = 0;
int wait;
unsigned char temp;
/*
* Read the requested registers of the seeprom. The loop
* will range from 0 to count-1.
*/
for (k = 0; k < count; k = k + 1) {
/* Send chip select for one clock cycle. */
outb(offset, MS | CK | CS);
CLOCK_PULSE(offset, RDY);
/*
* Now we're ready to send the read command followed by the
* address of the 16-bit register we want to read.
*/
for (i = 0; i < seeprom_read.len; i = i + 1) {
if (seeprom_read.bits[i])
temp = MS | CS | DO;
else
temp = MS | CS;
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
temp = temp ^ CK;
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
}
/* Send the 6 bit address (MSB first, LSB last). */
for (i = 5; i >= 0; i = i - 1) {
/* k is the address, i is the bit */
if (k & (1 << i))
temp = MS | CS | DO;
else
temp = MS | CS;
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
temp = temp ^ CK;
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
}
/*
* Now read the 16 bit register. An initial 0 precedes the
* register contents which begins with bit 15 (MSB) and ends
* with bit 0 (LSB). The initial 0 will be shifted off the
* top of our word as we let the loop run from 0 to 16.
*/
for (i = 0; i <= 16; i = i + 1) {
temp = MS | CS;
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
temp = temp ^ CK;
if (inb(offset) & DI)
buf[k] = (buf[k] << 1) | 0x1;
else
buf[k] = (buf[k] << 1);
outb(offset, temp);
CLOCK_PULSE(offset, RDY);
}
/* Reset the chip select for the next command cycle. */
outb(offset, MS);
CLOCK_PULSE(offset, RDY);
outb(offset, MS | CK);
CLOCK_PULSE(offset, RDY);
outb(offset, MS);
CLOCK_PULSE(offset, RDY);
}
#if 0
printf ("Serial EEPROM:");
for (k = 0; k < count; k = k + 1) {
if (((k % 8) == 0) && (k != 0))
{
printf ("\n ");
}
printf (" 0x%x", buf[k]);
}
printf ("\n");
#endif
return (1);
}
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