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eisa_enumerator.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:11k
源码类别:
Linux/Unix编程
开发平台:
Unix_Linux
- /*
- * eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines
- *
- * 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.
- *
- * 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/gsc.h>
- #include <asm/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] = '';
- 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 = kmalloc(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;
- printk("memory %lx-%lx ", res->start, res->end);
- result = request_resource(mem_parent, res);
- if (result < 0) {
- printk("n" 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);
- printk("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);
- printk("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 = kmalloc(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;
- printk("ioports %lx-%lx ", res->start, res->end);
- result = request_resource(io_parent, res);
- if (result < 0) {
- printk("n" 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("n" KERN_WARNING "port_init: unverified mask attributen");
- 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 attributen");
- 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("n" KERN_WARNING "port_init: unverified mask attributen");
- 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("n" KERN_ERR "Invalid port init word %02xn", 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("n" 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 confgiuration, 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("n" KERN_ERR "eisa_enumerator: function %d length mis-match "
- "got %d, expected %dn",
- num_func, pos-p0, function_len);
- res=-1;
- break;
- }
- pos = p0 + function_len;
- }
- printk("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 %dn",
- 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 %dn",
- 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) {
- /* 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 busn");
- 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)) {
- return -1;
- }
- 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 rangen",es->config_data_offset);
- return -1;
- }
- }
- return 0;
- }