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Diffstat (limited to 'drivers/scsi/aic7xxx/aic7xxx_93cx6.c')
-rw-r--r--drivers/scsi/aic7xxx/aic7xxx_93cx6.c318
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diff --git a/drivers/scsi/aic7xxx/aic7xxx_93cx6.c b/drivers/scsi/aic7xxx/aic7xxx_93cx6.c
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+/*
+ * Interface for the 93C66/56/46/26/06 serial eeprom parts.
+ *
+ * Copyright (c) 1995, 1996 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, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: //depot/aic7xxx/aic7xxx/aic7xxx_93cx6.c#19 $
+ */
+
+/*
+ * The instruction set of the 93C66/56/46/26/06 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 precede
+ * 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.
+ * **Note: There are 8 address bits for the 93C56/66 chips unlike
+ * the 93C46/26/06 chips which have 6 address bits.
+ *
+ * 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 "aic7xxx_osm.h"
+#include "aic7xxx_inline.h"
+#include "aic7xxx_93cx6.h"
+
+/*
+ * Right now, we only have to read the SEEPROM. But we make it easier to
+ * add other 93Cx6 functions.
+ */
+struct seeprom_cmd {
+ uint8_t len;
+ uint8_t bits[11];
+};
+
+/* Short opcodes for the c46 */
+static const struct seeprom_cmd seeprom_ewen = {9, {1, 0, 0, 1, 1, 0, 0, 0, 0}};
+static const struct seeprom_cmd seeprom_ewds = {9, {1, 0, 0, 0, 0, 0, 0, 0, 0}};
+
+/* Long opcodes for the C56/C66 */
+static const struct seeprom_cmd seeprom_long_ewen = {11, {1, 0, 0, 1, 1, 0, 0, 0, 0}};
+static const struct seeprom_cmd seeprom_long_ewds = {11, {1, 0, 0, 0, 0, 0, 0, 0, 0}};
+
+/* Common opcodes */
+static const struct seeprom_cmd seeprom_write = {3, {1, 0, 1}};
+static const struct seeprom_cmd seeprom_read = {3, {1, 1, 0}};
+
+/*
+ * Wait for the SEERDY to go high; about 800 ns.
+ */
+#define CLOCK_PULSE(sd, rdy) \
+ while ((SEEPROM_STATUS_INB(sd) & rdy) == 0) { \
+ ; /* Do nothing */ \
+ } \
+ (void)SEEPROM_INB(sd); /* Clear clock */
+
+/*
+ * Send a START condition and the given command
+ */
+static void
+send_seeprom_cmd(struct seeprom_descriptor *sd, const struct seeprom_cmd *cmd)
+{
+ uint8_t temp;
+ int i = 0;
+
+ /* Send chip select for one clock cycle. */
+ temp = sd->sd_MS ^ sd->sd_CS;
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+
+ for (i = 0; i < cmd->len; i++) {
+ if (cmd->bits[i] != 0)
+ temp ^= sd->sd_DO;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ if (cmd->bits[i] != 0)
+ temp ^= sd->sd_DO;
+ }
+}
+
+/*
+ * Clear CS put the chip in the reset state, where it can wait for new commands.
+ */
+static void
+reset_seeprom(struct seeprom_descriptor *sd)
+{
+ uint8_t temp;
+
+ temp = sd->sd_MS;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+}
+
+/*
+ * Read the serial EEPROM and returns 1 if successful and 0 if
+ * not successful.
+ */
+int
+ahc_read_seeprom(struct seeprom_descriptor *sd, uint16_t *buf,
+ u_int start_addr, u_int count)
+{
+ int i = 0;
+ u_int k = 0;
+ uint16_t v;
+ uint8_t 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++) {
+ /*
+ * Now we're ready to send the read command followed by the
+ * address of the 16-bit register we want to read.
+ */
+ send_seeprom_cmd(sd, &seeprom_read);
+
+ /* Send the 6 or 8 bit address (MSB first, LSB last). */
+ temp = sd->sd_MS ^ sd->sd_CS;
+ for (i = (sd->sd_chip - 1); i >= 0; i--) {
+ if ((k & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ if ((k & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ }
+
+ /*
+ * 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.
+ */
+ v = 0;
+ for (i = 16; i >= 0; i--) {
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ v <<= 1;
+ if (SEEPROM_DATA_INB(sd) & sd->sd_DI)
+ v |= 1;
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ }
+
+ buf[k - start_addr] = v;
+
+ /* Reset the chip select for the next command cycle. */
+ reset_seeprom(sd);
+ }
+#ifdef AHC_DUMP_EEPROM
+ printk("\nSerial EEPROM:\n\t");
+ for (k = 0; k < count; k = k + 1) {
+ if (((k % 8) == 0) && (k != 0)) {
+ printk(KERN_CONT "\n\t");
+ }
+ printk(KERN_CONT " 0x%x", buf[k]);
+ }
+ printk(KERN_CONT "\n");
+#endif
+ return (1);
+}
+
+/*
+ * Write the serial EEPROM and return 1 if successful and 0 if
+ * not successful.
+ */
+int
+ahc_write_seeprom(struct seeprom_descriptor *sd, uint16_t *buf,
+ u_int start_addr, u_int count)
+{
+ const struct seeprom_cmd *ewen, *ewds;
+ uint16_t v;
+ uint8_t temp;
+ int i, k;
+
+ /* Place the chip into write-enable mode */
+ if (sd->sd_chip == C46) {
+ ewen = &seeprom_ewen;
+ ewds = &seeprom_ewds;
+ } else if (sd->sd_chip == C56_66) {
+ ewen = &seeprom_long_ewen;
+ ewds = &seeprom_long_ewds;
+ } else {
+ printk("ahc_write_seeprom: unsupported seeprom type %d\n",
+ sd->sd_chip);
+ return (0);
+ }
+
+ send_seeprom_cmd(sd, ewen);
+ reset_seeprom(sd);
+
+ /* Write all requested data out to the seeprom. */
+ temp = sd->sd_MS ^ sd->sd_CS;
+ for (k = start_addr; k < count + start_addr; k++) {
+ /* Send the write command */
+ send_seeprom_cmd(sd, &seeprom_write);
+
+ /* Send the 6 or 8 bit address (MSB first). */
+ for (i = (sd->sd_chip - 1); i >= 0; i--) {
+ if ((k & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ if ((k & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ }
+
+ /* Write the 16 bit value, MSB first */
+ v = buf[k - start_addr];
+ for (i = 15; i >= 0; i--) {
+ if ((v & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ if ((v & (1 << i)) != 0)
+ temp ^= sd->sd_DO;
+ }
+
+ /* Wait for the chip to complete the write */
+ temp = sd->sd_MS;
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ temp = sd->sd_MS ^ sd->sd_CS;
+ do {
+ SEEPROM_OUTB(sd, temp);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ SEEPROM_OUTB(sd, temp ^ sd->sd_CK);
+ CLOCK_PULSE(sd, sd->sd_RDY);
+ } while ((SEEPROM_DATA_INB(sd) & sd->sd_DI) == 0);
+
+ reset_seeprom(sd);
+ }
+
+ /* Put the chip back into write-protect mode */
+ send_seeprom_cmd(sd, ewds);
+ reset_seeprom(sd);
+
+ return (1);
+}
+
+int
+ahc_verify_cksum(struct seeprom_config *sc)
+{
+ int i;
+ int maxaddr;
+ uint32_t checksum;
+ uint16_t *scarray;
+
+ maxaddr = (sizeof(*sc)/2) - 1;
+ checksum = 0;
+ scarray = (uint16_t *)sc;
+
+ for (i = 0; i < maxaddr; i++)
+ checksum = checksum + scarray[i];
+ if (checksum == 0
+ || (checksum & 0xFFFF) != sc->checksum) {
+ return (0);
+ } else {
+ return(1);
+ }
+}
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