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linux-next/drivers/scsi/sym53c8xx_2/sym_nvram.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

768 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
* of PCI-SCSI IO processors.
*
* Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
*
* 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 <wolf@cologne.de>
* Stefan Esser <se@mi.Uni-Koeln.de>
* Copyright (C) 1994 Wolfgang Stanglmeier
*
* Other major contributions:
*
* NVRAM detection and reading.
* Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
*
*-----------------------------------------------------------------------------
*/
#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_tcb *tp, int target, Symbios_nvram *nvram)
{
Symbios_target *tn = &nvram->target[target];
if (!(tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED))
tp->usrtags = 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;
tp->usr_period = (tn->sync_period + 3) / 4;
tp->usr_width = (tn->bus_width == 0x8) ? 0 : 1;
}
static const unsigned char Tekram_sync[16] = {
25, 31, 37, 43, 50, 62, 75, 125, 12, 15, 18, 21, 6, 7, 9, 10
};
/*
* Get target set-up from Tekram format NVRAM.
*/
static void
sym_Tekram_setup_target(struct sym_tcb *tp, int target, Tekram_nvram *nvram)
{
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 (tn->flags & TEKRAM_SYNC_NEGO)
tp->usr_period = Tekram_sync[tn->sync_index & 0xf];
tp->usr_width = (tn->flags & TEKRAM_WIDE_NEGO) ? 1 : 0;
}
/*
* Get target setup from NVRAM.
*/
void sym_nvram_setup_target(struct sym_tcb *tp, int target, struct sym_nvram *nvp)
{
switch (nvp->type) {
case SYM_SYMBIOS_NVRAM:
sym_Symbios_setup_target(tp, target, &nvp->data.Symbios);
break;
case SYM_TEKRAM_NVRAM:
sym_Tekram_setup_target(tp, 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);
/* this is to set NVRAM into a known state with GPIO0/1 both low */
gpreg = old_gpreg;
S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
/* now set NVRAM inactive with GPIO0/1 both high */
S24C16_stop(np, &gpreg);
/* NVRAM has to be written in segments of 16 bytes */
for (x = 0; x < len ; x += 16) {
do {
S24C16_start(np, &gpreg);
S24C16_write_byte(np, &ack_data,
0xa0 | (((offset+x) >> 7) & 0x0e),
&gpreg, &gpcntl);
} while (ack_data & 0x01);
S24C16_write_byte(np, &ack_data, (offset+x) & 0xff,
&gpreg, &gpcntl);
for (y = 0; y < 16; y++)
S24C16_write_byte(np, &ack_data, data[x+y],
&gpreg, &gpcntl);
S24C16_stop(np, &gpreg);
}
/* return GPIO0/1 to original states after having accessed NVRAM */
OUTB(np, nc_gpcntl, old_gpcntl);
OUTB(np, nc_gpreg, old_gpreg);
return 0;
}
#endif /* SYM_CONF_NVRAM_WRITE_SUPPORT */
/*
* Read 'len' bytes starting at 'offset'.
*/
static int sym_read_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 retv = 1;
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);
/* this is to set NVRAM into a known state with GPIO0/1 both low */
gpreg = old_gpreg;
S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
/* now set NVRAM inactive with GPIO0/1 both high */
S24C16_stop(np, &gpreg);
/* activate NVRAM */
S24C16_start(np, &gpreg);
/* write device code and random address MSB */
S24C16_write_byte(np, &ack_data,
0xa0 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
if (ack_data & 0x01)
goto out;
/* write random address LSB */
S24C16_write_byte(np, &ack_data,
offset & 0xff, &gpreg, &gpcntl);
if (ack_data & 0x01)
goto out;
/* regenerate START state to set up for reading */
S24C16_start(np, &gpreg);
/* rewrite device code and address MSB with read bit set (lsb = 0x01) */
S24C16_write_byte(np, &ack_data,
0xa1 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
if (ack_data & 0x01)
goto out;
/* now set up GPIO0 for inputting data */
gpcntl |= 0x01;
OUTB(np, nc_gpcntl, gpcntl);
/* input all requested data - only part of total NVRAM */
for (x = 0; x < len; x++)
S24C16_read_byte(np, &data[x], (x == (len-1)), &gpreg, &gpcntl);
/* finally put NVRAM back in inactive mode */
gpcntl &= 0xfe;
OUTB(np, nc_gpcntl, gpcntl);
S24C16_stop(np, &gpreg);
retv = 0;
out:
/* return GPIO0/1 to original states after having accessed NVRAM */
OUTB(np, nc_gpcntl, old_gpcntl);
OUTB(np, nc_gpreg, old_gpreg);
return retv;
}
#undef SET_BIT
#undef CLR_BIT
#undef SET_CLK
#undef CLR_CLK
/*
* Try reading Symbios NVRAM.
* Return 0 if OK.
*/
static int sym_read_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
{
static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
u_char *data = (u_char *) nvram;
int len = sizeof(*nvram);
u_short csum;
int x;
/* probe the 24c16 and read the SYMBIOS 24c16 area */
if (sym_read_S24C16_nvram (np, SYMBIOS_NVRAM_ADDRESS, data, len))
return 1;
/* check valid NVRAM signature, verify byte count and checksum */
if (nvram->type != 0 ||
memcmp(nvram->trailer, Symbios_trailer, 6) ||
nvram->byte_count != len - 12)
return 1;
/* verify checksum */
for (x = 6, csum = 0; x < len - 6; x++)
csum += data[x];
if (csum != nvram->checksum)
return 1;
return 0;
}
/*
* 93C46 EEPROM reading.
*
* GPOI0 - data in
* GPIO1 - data out
* GPIO2 - clock
* GPIO4 - chip select
*
* Used by Tekram.
*/
/*
* Pulse clock bit in GPIO0
*/
static void T93C46_Clk(struct sym_device *np, u_char *gpreg)
{
OUTB(np, nc_gpreg, *gpreg | 0x04);
INB(np, nc_mbox1);
udelay(2);
OUTB(np, nc_gpreg, *gpreg);
}
/*
* Read bit from NVRAM
*/
static void T93C46_Read_Bit(struct sym_device *np, u_char *read_bit, u_char *gpreg)
{
udelay(2);
T93C46_Clk(np, gpreg);
*read_bit = INB(np, nc_gpreg);
}
/*
* Write bit to GPIO0
*/
static void T93C46_Write_Bit(struct sym_device *np, u_char write_bit, u_char *gpreg)
{
if (write_bit & 0x01)
*gpreg |= 0x02;
else
*gpreg &= 0xfd;
*gpreg |= 0x10;
OUTB(np, nc_gpreg, *gpreg);
INB(np, nc_mbox1);
udelay(2);
T93C46_Clk(np, gpreg);
}
/*
* Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
*/
static void T93C46_Stop(struct sym_device *np, u_char *gpreg)
{
*gpreg &= 0xef;
OUTB(np, nc_gpreg, *gpreg);
INB(np, nc_mbox1);
udelay(2);
T93C46_Clk(np, gpreg);
}
/*
* Send read command and address to NVRAM
*/
static void T93C46_Send_Command(struct sym_device *np, u_short write_data,
u_char *read_bit, u_char *gpreg)
{
int x;
/* send 9 bits, start bit (1), command (2), address (6) */
for (x = 0; x < 9; x++)
T93C46_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);
*read_bit = INB(np, nc_gpreg);
}
/*
* READ 2 bytes from the NVRAM
*/
static void T93C46_Read_Word(struct sym_device *np,
unsigned short *nvram_data, unsigned char *gpreg)
{
int x;
u_char read_bit;
*nvram_data = 0;
for (x = 0; x < 16; x++) {
T93C46_Read_Bit(np, &read_bit, gpreg);
if (read_bit & 0x01)
*nvram_data |= (0x01 << (15 - x));
else
*nvram_data &= ~(0x01 << (15 - x));
}
}
/*
* Read Tekram NvRAM data.
*/
static int T93C46_Read_Data(struct sym_device *np, unsigned short *data,
int len, unsigned char *gpreg)
{
int x;
for (x = 0; x < len; x++) {
unsigned char read_bit;
/* output read command and address */
T93C46_Send_Command(np, 0x180 | x, &read_bit, gpreg);
if (read_bit & 0x01)
return 1; /* Bad */
T93C46_Read_Word(np, &data[x], gpreg);
T93C46_Stop(np, gpreg);
}
return 0;
}
/*
* Try reading 93C46 Tekram NVRAM.
*/
static int sym_read_T93C46_nvram(struct sym_device *np, Tekram_nvram *nvram)
{
u_char gpcntl, gpreg;
u_char old_gpcntl, old_gpreg;
int retv = 1;
/* save current state of GPCNTL and GPREG */
old_gpreg = INB(np, nc_gpreg);
old_gpcntl = INB(np, nc_gpcntl);
/* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
1/2/4 out */
gpreg = old_gpreg & 0xe9;
OUTB(np, nc_gpreg, gpreg);
gpcntl = (old_gpcntl & 0xe9) | 0x09;
OUTB(np, nc_gpcntl, gpcntl);
/* input all of NVRAM, 64 words */
retv = T93C46_Read_Data(np, (u_short *) nvram,
sizeof(*nvram) / sizeof(short), &gpreg);
/* return GPIO0/1/2/4 to original states after having accessed NVRAM */
OUTB(np, nc_gpcntl, old_gpcntl);
OUTB(np, nc_gpreg, old_gpreg);
return retv;
}
/*
* Try reading Tekram NVRAM.
* Return 0 if OK.
*/
static int sym_read_Tekram_nvram (struct sym_device *np, Tekram_nvram *nvram)
{
u_char *data = (u_char *) nvram;
int len = sizeof(*nvram);
u_short csum;
int x;
switch (np->pdev->device) {
case PCI_DEVICE_ID_NCR_53C885:
case PCI_DEVICE_ID_NCR_53C895:
case PCI_DEVICE_ID_NCR_53C896:
x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
data, len);
break;
case PCI_DEVICE_ID_NCR_53C875:
x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
data, len);
if (!x)
break;
/* fall through */
default:
x = sym_read_T93C46_nvram(np, nvram);
break;
}
if (x)
return 1;
/* verify checksum */
for (x = 0, csum = 0; x < len - 1; x += 2)
csum += data[x] + (data[x+1] << 8);
if (csum != 0x1234)
return 1;
return 0;
}
#ifdef CONFIG_PARISC
/*
* Host firmware (PDC) keeps a table for altering SCSI capabilities.
* Many newer machines export one channel of 53c896 chip as SE, 50-pin HD.
* Also used for Multi-initiator SCSI clusters to set the SCSI Initiator ID.
*/
static int sym_read_parisc_pdc(struct sym_device *np, struct pdc_initiator *pdc)
{
struct hardware_path hwpath;
get_pci_node_path(np->pdev, &hwpath);
if (!pdc_get_initiator(&hwpath, pdc))
return 0;
return SYM_PARISC_PDC;
}
#else
static inline int sym_read_parisc_pdc(struct sym_device *np,
struct pdc_initiator *x)
{
return 0;
}
#endif
/*
* Try reading Symbios or Tekram NVRAM
*/
int sym_read_nvram(struct sym_device *np, struct sym_nvram *nvp)
{
if (!sym_read_Symbios_nvram(np, &nvp->data.Symbios)) {
nvp->type = SYM_SYMBIOS_NVRAM;
sym_display_Symbios_nvram(np, &nvp->data.Symbios);
} else if (!sym_read_Tekram_nvram(np, &nvp->data.Tekram)) {
nvp->type = SYM_TEKRAM_NVRAM;
sym_display_Tekram_nvram(np, &nvp->data.Tekram);
} else {
nvp->type = sym_read_parisc_pdc(np, &nvp->data.parisc);
}
return nvp->type;
}
char *sym_nvram_type(struct sym_nvram *nvp)
{
switch (nvp->type) {
case SYM_SYMBIOS_NVRAM:
return "Symbios NVRAM";
case SYM_TEKRAM_NVRAM:
return "Tekram NVRAM";
case SYM_PARISC_PDC:
return "PA-RISC Firmware";
default:
return "No NVRAM";
}
}
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