ahc/ahe driver update from freebsd; merged by soda@sra.co.jp and

pete@demon.net

1 files changed, 181 insertions, 0 deletions

diff --git a/sys/dev/ic/93cx6.c b/sys/dev/ic/93cx6.c
new file mode 100644
index 00000000000..89ac0343bde
--- /dev/null
+++ b/sys/dev/ic/93cx6.c
@@ -0,0 +1,181 @@
+/*
+ * 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: 93cx6.c,v 1.1 1996/05/05 12:42:27 deraadt Exp $
+ */
+
+/*
+ *   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>
+#if defined(__FreeBSD__)
+#include <machine/clock.h>
+#include <i386/scsi/93cx6.h>
+#endif
+#if defined(__NetBSD__)
+#include <machine/pio.h>
+#include <dev/ic/93cx6.h>
+#endif
+
+/*
+ * Right now, we only have to read the SEEPROM.  But we make it easier to
+ * add other 93Cx6 functions.
+ */
+static 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,
+		  u_int	   start_addr,
+		  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;
+	unsigned char temp;
+
+	/*
+	 * Read the requested registers of the seeprom.  The loop
+	 * will range from 0 to count-1.
+	 */
+	for (k = start_addr; k < count + start_addr; 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 - start_addr] = 
+					(buf[k - start_addr] << 1) | 0x1;
+			else
+				buf[k - start_addr] = (buf[k - start_addr]<< 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);
+}