sym_nvram.c

linux-2.6.15.6

/*
 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
 * of PCI-SCSI IO processors.
 *
 * Copyright (C) 1999-2001  Gerard Roudier <[e-mail]>
 *
 * This driver is derived from the Linux sym53c8xx driver.
 * Copyright (C) 1998-2000  Gerard Roudier
 *
 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
 * a port of the FreeBSD ncr driver to Linux-1.2.13.
 *
 * The original ncr driver has been written for 386bsd and FreeBSD by
 *         Wolfgang Stanglmeier        <[e-mail]>
 *         Stefan Esser                <[e-mail]>
 * Copyright (C) 1994  Wolfgang Stanglmeier
 *
 * Other major contributions:
 *
 * NVRAM detection and reading.
 * Copyright (C) 1997 Richard Waltham <[e-mail]>
 *
 *-----------------------------------------------------------------------------
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sym_glue.h"
#include "sym_nvram.h"

#ifdef	SYM_CONF_DEBUG_NVRAM
static u_char Tekram_boot_delay[7] = {3, 5, 10, 20, 30, 60, 120};
#endif

/*
 *  Get host setup from NVRAM.
 */
void sym_nvram_setup_host(struct Scsi_Host *shost, struct sym_hcb *np, struct sym_nvram *nvram)
{
	/*
	 *  Get parity checking, host ID, verbose mode 
	 *  and miscellaneous host flags from NVRAM.
	 */
	switch (nvram->type) {
	case SYM_SYMBIOS_NVRAM:
		if (!(nvram->data.Symbios.flags & SYMBIOS_PARITY_ENABLE))
			np->rv_scntl0  &= ~0x0a;
		np->myaddr = nvram->data.Symbios.host_id & 0x0f;
		if (nvram->data.Symbios.flags & SYMBIOS_VERBOSE_MSGS)
			np->verbose += 1;
		if (nvram->data.Symbios.flags1 & SYMBIOS_SCAN_HI_LO)
			shost->reverse_ordering = 1;
		if (nvram->data.Symbios.flags2 & SYMBIOS_AVOID_BUS_RESET)
			np->usrflags |= SYM_AVOID_BUS_RESET;
		break;
	case SYM_TEKRAM_NVRAM:
		np->myaddr = nvram->data.Tekram.host_id & 0x0f;
		break;
#ifdef CONFIG_PARISC
	case SYM_PARISC_PDC:
		if (nvram->data.parisc.host_id != -1)
			np->myaddr = nvram->data.parisc.host_id;
		if (nvram->data.parisc.factor != -1)
			np->minsync = nvram->data.parisc.factor;
		if (nvram->data.parisc.width != -1)
			np->maxwide = nvram->data.parisc.width;
		switch (nvram->data.parisc.mode) {
			case 0: np->scsi_mode = SMODE_SE; break;
			case 1: np->scsi_mode = SMODE_HVD; break;
			case 2: np->scsi_mode = SMODE_LVD; break;
			default: break;
		}
#endif
	default:
		break;
	}
}

/*
 *  Get target set-up from Symbios format NVRAM.
 */
static void
sym_Symbios_setup_target(struct sym_hcb *np, int target, Symbios_nvram *nvram)
{
	struct sym_tcb *tp = &np->target[target];
	Symbios_target *tn = &nvram->target[target];

	tp->usrtags =
		(tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? SYM_SETUP_MAX_TAG : 0;

	if (!(tn->flags & SYMBIOS_DISCONNECT_ENABLE))
		tp->usrflags &= ~SYM_DISC_ENABLED;
	if (!(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME))
		tp->usrflags |= SYM_SCAN_BOOT_DISABLED;
	if (!(tn->flags & SYMBIOS_SCAN_LUNS))
		tp->usrflags |= SYM_SCAN_LUNS_DISABLED;
}

/*
 *  Get target set-up from Tekram format NVRAM.
 */
static void
sym_Tekram_setup_target(struct sym_hcb *np, int target, Tekram_nvram *nvram)
{
	struct sym_tcb *tp = &np->target[target];
	struct Tekram_target *tn = &nvram->target[target];

	if (tn->flags & TEKRAM_TAGGED_COMMANDS) {
		tp->usrtags = 2 << nvram->max_tags_index;
	}

	if (tn->flags & TEKRAM_DISCONNECT_ENABLE)
		tp->usrflags |= SYM_DISC_ENABLED;
 
	/* If any device does not support parity, we will not use this option */
	if (!(tn->flags & TEKRAM_PARITY_CHECK))
		np->rv_scntl0  &= ~0x0a; /* SCSI parity checking disabled */
}

/*
 *  Get target setup from NVRAM.
 */
void sym_nvram_setup_target(struct sym_hcb *np, int target, struct sym_nvram *nvp)
{
	switch (nvp->type) {
	case SYM_SYMBIOS_NVRAM:
		sym_Symbios_setup_target(np, target, &nvp->data.Symbios);
		break;
	case SYM_TEKRAM_NVRAM:
		sym_Tekram_setup_target(np, target, &nvp->data.Tekram);
		break;
	default:
		break;
	}
}

#ifdef	SYM_CONF_DEBUG_NVRAM
/*
 *  Dump Symbios format NVRAM for debugging purpose.
 */
static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
{
	int i;

	/* display Symbios nvram host data */
	printf("%s: HOST ID=%d%s%s%s%s%s%s\n",
		sym_name(np), nvram->host_id & 0x0f,
		(nvram->flags  & SYMBIOS_SCAM_ENABLE)	? " SCAM"	:"",
		(nvram->flags  & SYMBIOS_PARITY_ENABLE)	? " PARITY"	:"",
		(nvram->flags  & SYMBIOS_VERBOSE_MSGS)	? " VERBOSE"	:"", 
		(nvram->flags  & SYMBIOS_CHS_MAPPING)	? " CHS_ALT"	:"", 
		(nvram->flags2 & SYMBIOS_AVOID_BUS_RESET)?" NO_RESET"	:"",
		(nvram->flags1 & SYMBIOS_SCAN_HI_LO)	? " HI_LO"	:"");

	/* display Symbios nvram drive data */
	for (i = 0 ; i < 15 ; i++) {
		struct Symbios_target *tn = &nvram->target[i];
		printf("%s-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
		sym_name(np), i,
		(tn->flags & SYMBIOS_DISCONNECT_ENABLE)	? " DISC"	: "",
		(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME)	? " SCAN_BOOT"	: "",
		(tn->flags & SYMBIOS_SCAN_LUNS)		? " SCAN_LUNS"	: "",
		(tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ"	: "",
		tn->bus_width,
		tn->sync_period / 4,
		tn->timeout);
	}
}

/*
 *  Dump TEKRAM format NVRAM for debugging purpose.
 */
static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram)
{
	int i, tags, boot_delay;
	char *rem;

	/* display Tekram nvram host data */
	tags = 2 << nvram->max_tags_index;
	boot_delay = 0;
	if (nvram->boot_delay_index < 6)
		boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
	switch ((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
	default:
	case 0:	rem = "";			break;
	case 1: rem = " REMOVABLE=boot device";	break;
	case 2: rem = " REMOVABLE=all";		break;
	}

	printf("%s: HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
		sym_name(np), nvram->host_id & 0x0f,
		(nvram->flags1 & SYMBIOS_SCAM_ENABLE)	? " SCAM"	:"",
		(nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES":"",
		(nvram->flags & TEKRAM_DRIVES_SUP_1GB)	? " >1GB"	:"",
		(nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET"	:"",
		(nvram->flags & TEKRAM_ACTIVE_NEGATION)	? " ACT_NEG"	:"",
		(nvram->flags & TEKRAM_IMMEDIATE_SEEK)	? " IMM_SEEK"	:"",
		(nvram->flags & TEKRAM_SCAN_LUNS)	? " SCAN_LUNS"	:"",
		(nvram->flags1 & TEKRAM_F2_F6_ENABLED)	? " F2_F6"	:"",
		rem, boot_delay, tags);

	/* display Tekram nvram drive data */
	for (i = 0; i <= 15; i++) {
		int sync, j;
		struct Tekram_target *tn = &nvram->target[i];
		j = tn->sync_index & 0xf;
		sync = Tekram_sync[j];
		printf("%s-%d:%s%s%s%s%s%s PERIOD=%d\n",
		sym_name(np), i,
		(tn->flags & TEKRAM_PARITY_CHECK)	? " PARITY"	: "",
		(tn->flags & TEKRAM_SYNC_NEGO)		? " SYNC"	: "",
		(tn->flags & TEKRAM_DISCONNECT_ENABLE)	? " DISC"	: "",
		(tn->flags & TEKRAM_START_CMD)		? " START"	: "",
		(tn->flags & TEKRAM_TAGGED_COMMANDS)	? " TCQ"	: "",
		(tn->flags & TEKRAM_WIDE_NEGO)		? " WIDE"	: "",
		sync);
	}
}
#else
static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram) { (void)np; (void)nvram; }
static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram) { (void)np; (void)nvram; }
#endif	/* SYM_CONF_DEBUG_NVRAM */


/*
 *  24C16 EEPROM reading.
 *
 *  GPOI0 - data in/data out
 *  GPIO1 - clock
 *  Symbios NVRAM wiring now also used by Tekram.
 */

#define SET_BIT 0
#define CLR_BIT 1
#define SET_CLK 2
#define CLR_CLK 3

/*
 *  Set/clear data/clock bit in GPIO0
 */
static void S24C16_set_bit(struct sym_device *np, u_char write_bit, u_char *gpreg, 
			  int bit_mode)
{
	udelay(5);
	switch (bit_mode) {
	case SET_BIT:
		*gpreg |= write_bit;
		break;
	case CLR_BIT:
		*gpreg &= 0xfe;
		break;
	case SET_CLK:
		*gpreg |= 0x02;
		break;
	case CLR_CLK:
		*gpreg &= 0xfd;
		break;

	}
	OUTB(np, nc_gpreg, *gpreg);
	INB(np, nc_mbox1);
	udelay(5);
}

/*
 *  Send START condition to NVRAM to wake it up.
 */
static void S24C16_start(struct sym_device *np, u_char *gpreg)
{
	S24C16_set_bit(np, 1, gpreg, SET_BIT);
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	S24C16_set_bit(np, 0, gpreg, CLR_BIT);
	S24C16_set_bit(np, 0, gpreg, CLR_CLK);
}

/*
 *  Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
 */
static void S24C16_stop(struct sym_device *np, u_char *gpreg)
{
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	S24C16_set_bit(np, 1, gpreg, SET_BIT);
}

/*
 *  Read or write a bit to the NVRAM,
 *  read if GPIO0 input else write if GPIO0 output
 */
static void S24C16_do_bit(struct sym_device *np, u_char *read_bit, u_char write_bit, 
			 u_char *gpreg)
{
	S24C16_set_bit(np, write_bit, gpreg, SET_BIT);
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	if (read_bit)
		*read_bit = INB(np, nc_gpreg);
	S24C16_set_bit(np, 0, gpreg, CLR_CLK);
	S24C16_set_bit(np, 0, gpreg, CLR_BIT);
}

/*
 *  Output an ACK to the NVRAM after reading,
 *  change GPIO0 to output and when done back to an input
 */
static void S24C16_write_ack(struct sym_device *np, u_char write_bit, u_char *gpreg, 
			    u_char *gpcntl)
{
	OUTB(np, nc_gpcntl, *gpcntl & 0xfe);
	S24C16_do_bit(np, NULL, write_bit, gpreg);
	OUTB(np, nc_gpcntl, *gpcntl);
}

/*
 *  Input an ACK from NVRAM after writing,
 *  change GPIO0 to input and when done back to an output
 */
static void S24C16_read_ack(struct sym_device *np, u_char *read_bit, u_char *gpreg, 
			   u_char *gpcntl)
{
	OUTB(np, nc_gpcntl, *gpcntl | 0x01);
	S24C16_do_bit(np, read_bit, 1, gpreg);
	OUTB(np, nc_gpcntl, *gpcntl);
}

/*
 *  WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
 *  GPIO0 must already be set as an output
 */
static void S24C16_write_byte(struct sym_device *np, u_char *ack_data, u_char write_data, 
			     u_char *gpreg, u_char *gpcntl)
{
	int x;
	
	for (x = 0; x < 8; x++)
		S24C16_do_bit(np, NULL, (write_data >> (7 - x)) & 0x01, gpreg);
		
	S24C16_read_ack(np, ack_data, gpreg, gpcntl);
}

/*
 *  READ a byte from the NVRAM and then send an ACK to say we have got it,
 *  GPIO0 must already be set as an input
 */
static void S24C16_read_byte(struct sym_device *np, u_char *read_data, u_char ack_data, 
			    u_char *gpreg, u_char *gpcntl)
{
	int x;
	u_char read_bit;

	*read_data = 0;
	for (x = 0; x < 8; x++) {
		S24C16_do_bit(np, &read_bit, 1, gpreg);
		*read_data |= ((read_bit & 0x01) << (7 - x));
	}

	S24C16_write_ack(np, ack_data, gpreg, gpcntl);
}

#ifdef SYM_CONF_NVRAM_WRITE_SUPPORT
/*
 *  Write 'len' bytes starting at 'offset'.
 */
static int sym_write_S24C16_nvram(struct sym_device *np, int offset,
		u_char *data, int len)
{
	u_char	gpcntl, gpreg;
	u_char	old_gpcntl, old_gpreg;
	u_char	ack_data;
	int	x;

	/* save current state of GPCNTL and GPREG */
	old_gpreg	= INB(np, nc_gpreg);
	old_gpcntl	= INB(np, nc_gpcntl);
	gpcntl		= old_gpcntl & 0x1c;

	/* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
	OUTB(np, nc_gpreg,  old_gpreg);
	OUTB(np, nc_gpcntl, gpcntl);