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kernel/drivers/parisc/eisa_enumerator.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines
*
* Copyright (c) 2002 Daniel Engstrom <5116@telia.com>
*/
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <asm/eisa_bus.h>
#include <asm/eisa_eeprom.h>
/*
* Todo:
*
* PORT init with MASK attr and other size than byte
* MEMORY with other decode than 20 bit
* CRC stuff
* FREEFORM stuff
*/
#define EPI 0xc80
#define NUM_SLOT 16
#define SLOT2PORT(x) (x<<12)
/* macros to handle unaligned accesses and
* byte swapping. The data in the EEPROM is
* little-endian on the big-endian PAROSC */
#define get_8(x) (*(u_int8_t*)(x))
static inline u_int16_t get_16(const unsigned char *x)
{
return (x[1] << 8) | x[0];
}
static inline u_int32_t get_32(const unsigned char *x)
{
return (x[3] << 24) | (x[2] << 16) | (x[1] << 8) | x[0];
}
static inline u_int32_t get_24(const unsigned char *x)
{
return (x[2] << 24) | (x[1] << 16) | (x[0] << 8);
}
static void print_eisa_id(char *s, u_int32_t id)
{
char vendor[4];
int rev;
int device;
rev = id & 0xff;
id >>= 8;
device = id & 0xff;
id >>= 8;
vendor[3] = '\0';
vendor[2] = '@' + (id & 0x1f);
id >>= 5;
vendor[1] = '@' + (id & 0x1f);
id >>= 5;
vendor[0] = '@' + (id & 0x1f);
id >>= 5;
sprintf(s, "%s%02X%02X", vendor, device, rev);
}
static int configure_memory(const unsigned char *buf,
struct resource *mem_parent,
char *name)
{
int len;
u_int8_t c;
int i;
struct resource *res;
len=0;
for (i=0;i<HPEE_MEMORY_MAX_ENT;i++) {
c = get_8(buf+len);
if (NULL != (res = kzalloc(sizeof(struct resource), GFP_KERNEL))) {
int result;
res->name = name;
res->start = mem_parent->start + get_24(buf+len+2);
res->end = res->start + get_16(buf+len+5)*1024;
res->flags = IORESOURCE_MEM;
pr_cont("memory %pR ", res);
result = request_resource(mem_parent, res);
if (result < 0) {
printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
return result;
}
}
len+=7;
if (!(c & HPEE_MEMORY_MORE)) {
break;
}
}
return len;
}
static int configure_irq(const unsigned char *buf)
{
int len;
u_int8_t c;
int i;
len=0;
for (i=0;i<HPEE_IRQ_MAX_ENT;i++) {
c = get_8(buf+len);
pr_cont("IRQ %d ", c & HPEE_IRQ_CHANNEL_MASK);
if (c & HPEE_IRQ_TRIG_LEVEL) {
eisa_make_irq_level(c & HPEE_IRQ_CHANNEL_MASK);
} else {
eisa_make_irq_edge(c & HPEE_IRQ_CHANNEL_MASK);
}
len+=2;
/* hpux seems to allow for
* two bytes of irq data but only defines one of
* them, I think */
if (!(c & HPEE_IRQ_MORE)) {
break;
}
}
return len;
}
static int configure_dma(const unsigned char *buf)
{
int len;
u_int8_t c;
int i;
len=0;
for (i=0;i<HPEE_DMA_MAX_ENT;i++) {
c = get_8(buf+len);
pr_cont("DMA %d ", c&HPEE_DMA_CHANNEL_MASK);
/* fixme: maybe initialize the dma channel withthe timing ? */
len+=2;
if (!(c & HPEE_DMA_MORE)) {
break;
}
}
return len;
}
static int configure_port(const unsigned char *buf, struct resource *io_parent,
char *board)
{
int len;
u_int8_t c;
int i;
struct resource *res;
int result;
len=0;
for (i=0;i<HPEE_PORT_MAX_ENT;i++) {
c = get_8(buf+len);
if (NULL != (res = kzalloc(sizeof(struct resource), GFP_KERNEL))) {
res->name = board;
res->start = get_16(buf+len+1);
res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1;
res->flags = IORESOURCE_IO;
pr_cont("ioports %pR ", res);
result = request_resource(io_parent, res);
if (result < 0) {
printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
return result;
}
}
len+=3;
if (!(c & HPEE_PORT_MORE)) {
break;
}
}
return len;
}
/* byte 1 and 2 is the port number to write
* and at byte 3 the value to write starts.
* I assume that there are and- and or- masks
* here when HPEE_PORT_INIT_MASK is set but I have
* not yet encountered this. */
static int configure_port_init(const unsigned char *buf)
{
int len=0;
u_int8_t c;
while (len<HPEE_PORT_INIT_MAX_LEN) {
int s=0;
c = get_8(buf+len);
switch (c & HPEE_PORT_INIT_WIDTH_MASK) {
case HPEE_PORT_INIT_WIDTH_BYTE:
s=1;
if (c & HPEE_PORT_INIT_MASK) {
printk(KERN_WARNING "port_init: unverified mask attribute\n");
outb((inb(get_16(buf+len+1) &
get_8(buf+len+3)) |
get_8(buf+len+4)), get_16(buf+len+1));
} else {
outb(get_8(buf+len+3), get_16(buf+len+1));
}
break;
case HPEE_PORT_INIT_WIDTH_WORD:
s=2;
if (c & HPEE_PORT_INIT_MASK) {
printk(KERN_WARNING "port_init: unverified mask attribute\n");
outw((inw(get_16(buf+len+1)) &
get_16(buf+len+3)) |
get_16(buf+len+5),
get_16(buf+len+1));
} else {
outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1));
}
break;
case HPEE_PORT_INIT_WIDTH_DWORD:
s=4;
if (c & HPEE_PORT_INIT_MASK) {
printk(KERN_WARNING "port_init: unverified mask attribute\n");
outl((inl(get_16(buf+len+1) &
get_32(buf+len+3)) |
get_32(buf+len+7)), get_16(buf+len+1));
} else {
outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1));
}
break;
default:
printk(KERN_ERR "Invalid port init word %02x\n", c);
return 0;
}
if (c & HPEE_PORT_INIT_MASK) {
s*=2;
}
len+=s+3;
if (!(c & HPEE_PORT_INIT_MORE)) {
break;
}
}
return len;
}
static int configure_choise(const unsigned char *buf, u_int8_t *info)
{
int len;
/* theis record contain the value of the functions
* configuration choises and an info byte which
* describes which other records to expect in this
* function */
len = get_8(buf);
*info=get_8(buf+len+1);
return len+2;
}
static int configure_type_string(const unsigned char *buf)
{
int len;
/* just skip past the type field */
len = get_8(buf);
if (len > 80) {
printk(KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n", len);
}
return 1+len;
}
static int configure_function(const unsigned char *buf, int *more)
{
/* the init field seems to be a two-byte field
* which is non-zero if there are an other function following
* I think it is the length of the function def
*/
*more = get_16(buf);
return 2;
}
static int parse_slot_config(int slot,
const unsigned char *buf,
struct eeprom_eisa_slot_info *es,
struct resource *io_parent,
struct resource *mem_parent)
{
int res=0;
int function_len;
unsigned int pos=0;
unsigned int maxlen;
int num_func=0;
u_int8_t flags;
int p0;
char *board;
int id_string_used=0;
if (NULL == (board = kmalloc(8, GFP_KERNEL))) {
return -1;
}
print_eisa_id(board, es->eisa_slot_id);
printk(KERN_INFO "EISA slot %d: %s %s ",
slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA");
maxlen = es->config_data_length < HPEE_MAX_LENGTH ?
es->config_data_length : HPEE_MAX_LENGTH;
while ((pos < maxlen) && (num_func <= es->num_functions)) {
pos+=configure_function(buf+pos, &function_len);
if (!function_len) {
break;
}
num_func++;
p0 = pos;
pos += configure_choise(buf+pos, &flags);
if (flags & HPEE_FUNCTION_INFO_F_DISABLED) {
/* function disabled, skip silently */
pos = p0 + function_len;
continue;
}
if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) {
/* I have no idea how to handle this */
printk("function %d have free-form configuration, skipping ",
num_func);
pos = p0 + function_len;
continue;
}
/* the ordering of the sections need
* more investigation.
* Currently I think that memory comaed before IRQ
* I assume the order is LSB to MSB in the
* info flags
* eg type, memory, irq, dma, port, HPEE_PORT_init
*/
if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) {
pos += configure_type_string(buf+pos);
}
if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) {
id_string_used=1;
pos += configure_memory(buf+pos, mem_parent, board);
}
if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) {
pos += configure_irq(buf+pos);
}
if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) {
pos += configure_dma(buf+pos);
}
if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) {
id_string_used=1;
pos += configure_port(buf+pos, io_parent, board);
}
if (flags & HPEE_FUNCTION_INFO_HAVE_PORT_INIT) {
pos += configure_port_init(buf+pos);
}
if (p0 + function_len < pos) {
printk(KERN_ERR "eisa_enumerator: function %d length mis-match "
"got %d, expected %d\n",
num_func, pos-p0, function_len);
res=-1;
break;
}
pos = p0 + function_len;
}
pr_cont("\n");
if (!id_string_used) {
kfree(board);
}
if (pos != es->config_data_length) {
printk(KERN_ERR "eisa_enumerator: config data length mis-match got %d, expected %d\n",
pos, es->config_data_length);
res=-1;
}
if (num_func != es->num_functions) {
printk(KERN_ERR "eisa_enumerator: number of functions mis-match got %d, expected %d\n",
num_func, es->num_functions);
res=-2;
}
return res;
}
static int init_slot(int slot, struct eeprom_eisa_slot_info *es)
{
unsigned int id;
char id_string[8];
if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) {
/* try to read the id of the board in the slot */
id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI));
if (0xffffffff == id) {
/* Maybe we didn't expect a card to be here... */
if (es->eisa_slot_id == 0xffffffff)
return -1;
/* this board is not here or it does not
* support readid
*/
printk(KERN_ERR "EISA slot %d a configured board was not detected (",
slot);
print_eisa_id(id_string, es->eisa_slot_id);
printk(" expected %s)\n", id_string);
return -1;
}
if (es->eisa_slot_id != id) {
print_eisa_id(id_string, id);
printk(KERN_ERR "EISA slot %d id mis-match: got %s",
slot, id_string);
print_eisa_id(id_string, es->eisa_slot_id);
printk(" expected %s\n", id_string);
return -1;
}
}
/* now: we need to enable the board if
* it supports enabling and run through
* the port init sction if present
* and finally record any interrupt polarity
*/
if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) {
/* enable board */
outb(0x01| inb(SLOT2PORT(slot)+EPI+4),
SLOT2PORT(slot)+EPI+4);
}
return 0;
}
int eisa_enumerator(unsigned long eeprom_addr,
struct resource *io_parent, struct resource *mem_parent)
{
int i;
struct eeprom_header *eh;
static char eeprom_buf[HPEE_MAX_LENGTH];
for (i=0; i < HPEE_MAX_LENGTH; i++) {
eeprom_buf[i] = gsc_readb(eeprom_addr+i);
}
printk(KERN_INFO "Enumerating EISA bus\n");
eh = (struct eeprom_header*)(eeprom_buf);
for (i=0;i<eh->num_slots;i++) {
struct eeprom_eisa_slot_info *es;
es = (struct eeprom_eisa_slot_info*)
(&eeprom_buf[HPEE_SLOT_INFO(i)]);
if (-1==init_slot(i+1, es)) {
continue;
}
if (es->config_data_offset < HPEE_MAX_LENGTH) {
if (parse_slot_config(i+1, &eeprom_buf[es->config_data_offset],
es, io_parent, mem_parent)) {
return -1;
}
} else {
printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n",es->config_data_offset);
return -1;
}
}
return eh->num_slots;
}
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