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linux/drivers/pnp/pnpbios/rsparser.c
Thomas Renninger 2bb9a6b32f pnp: declare PNP option parsing functions as __init 
There are three kind of parse functions provided by PNP acpi/bios:
 - get current resources
 - set resources
 - get possible resources
The first two may be needed later at runtime.
The possible resource settings should never change dynamically.
And even if this would make any sense (I doubt it), the current implementation
only parses possible resource settings at early init time:
  -> declare all the option parsing __init

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-By: Rene Herman <rene.herman@gmail.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-06 10:41:19 -08:00

825 lines
18 KiB
C
Raw Blame History

/*
* rsparser.c - parses and encodes pnpbios resource data streams
*/
#include <linux/ctype.h>
#include <linux/pnp.h>
#include <linux/pnpbios.h>
#include <linux/string.h>
#include <linux/slab.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
#else
inline void pcibios_penalize_isa_irq(int irq, int active)
{
}
#endif /* CONFIG_PCI */
#include "pnpbios.h"
/* standard resource tags */
#define SMALL_TAG_PNPVERNO 0x01
#define SMALL_TAG_LOGDEVID 0x02
#define SMALL_TAG_COMPATDEVID 0x03
#define SMALL_TAG_IRQ 0x04
#define SMALL_TAG_DMA 0x05
#define SMALL_TAG_STARTDEP 0x06
#define SMALL_TAG_ENDDEP 0x07
#define SMALL_TAG_PORT 0x08
#define SMALL_TAG_FIXEDPORT 0x09
#define SMALL_TAG_VENDOR 0x0e
#define SMALL_TAG_END 0x0f
#define LARGE_TAG 0x80
#define LARGE_TAG_MEM 0x81
#define LARGE_TAG_ANSISTR 0x82
#define LARGE_TAG_UNICODESTR 0x83
#define LARGE_TAG_VENDOR 0x84
#define LARGE_TAG_MEM32 0x85
#define LARGE_TAG_FIXEDMEM32 0x86
/*
* Resource Data Stream Format:
*
* Allocated Resources (required)
* end tag ->
* Resource Configuration Options (optional)
* end tag ->
* Compitable Device IDs (optional)
* final end tag ->
*/
/*
* Allocated Resources
*/
static void pnpbios_parse_allocated_irqresource(struct pnp_resource_table *res,
int irq)
{
int i = 0;
while (!(res->irq_resource[i].flags & IORESOURCE_UNSET)
&& i < PNP_MAX_IRQ)
i++;
if (i < PNP_MAX_IRQ) {
res->irq_resource[i].flags = IORESOURCE_IRQ; // Also clears _UNSET flag
if (irq == -1) {
res->irq_resource[i].flags |= IORESOURCE_DISABLED;
return;
}
res->irq_resource[i].start =
res->irq_resource[i].end = (unsigned long)irq;
pcibios_penalize_isa_irq(irq, 1);
}
}
static void pnpbios_parse_allocated_dmaresource(struct pnp_resource_table *res,
int dma)
{
int i = 0;
while (i < PNP_MAX_DMA &&
!(res->dma_resource[i].flags & IORESOURCE_UNSET))
i++;
if (i < PNP_MAX_DMA) {
res->dma_resource[i].flags = IORESOURCE_DMA; // Also clears _UNSET flag
if (dma == -1) {
res->dma_resource[i].flags |= IORESOURCE_DISABLED;
return;
}
res->dma_resource[i].start =
res->dma_resource[i].end = (unsigned long)dma;
}
}
static void pnpbios_parse_allocated_ioresource(struct pnp_resource_table *res,
int io, int len)
{
int i = 0;
while (!(res->port_resource[i].flags & IORESOURCE_UNSET)
&& i < PNP_MAX_PORT)
i++;
if (i < PNP_MAX_PORT) {
res->port_resource[i].flags = IORESOURCE_IO; // Also clears _UNSET flag
if (len <= 0 || (io + len - 1) >= 0x10003) {
res->port_resource[i].flags |= IORESOURCE_DISABLED;
return;
}
res->port_resource[i].start = (unsigned long)io;
res->port_resource[i].end = (unsigned long)(io + len - 1);
}
}
static void pnpbios_parse_allocated_memresource(struct pnp_resource_table *res,
int mem, int len)
{
int i = 0;
while (!(res->mem_resource[i].flags & IORESOURCE_UNSET)
&& i < PNP_MAX_MEM)
i++;
if (i < PNP_MAX_MEM) {
res->mem_resource[i].flags = IORESOURCE_MEM; // Also clears _UNSET flag
if (len <= 0) {
res->mem_resource[i].flags |= IORESOURCE_DISABLED;
return;
}
res->mem_resource[i].start = (unsigned long)mem;
res->mem_resource[i].end = (unsigned long)(mem + len - 1);
}
}
static unsigned char *pnpbios_parse_allocated_resource_data(unsigned char *p,
unsigned char *end,
struct
pnp_resource_table
*res)
{
unsigned int len, tag;
int io, size, mask, i;
if (!p)
return NULL;
/* Blank the resource table values */
pnp_init_resource_table(res);
while ((char *)p < (char *)end) {
/* determine the type of tag */
if (p[0] & LARGE_TAG) { /* large tag */
len = (p[2] << 8) | p[1];
tag = p[0];
} else { /* small tag */
len = p[0] & 0x07;
tag = ((p[0] >> 3) & 0x0f);
}
switch (tag) {
case LARGE_TAG_MEM:
if (len != 9)
goto len_err;
io = *(short *)&p[4];
size = *(short *)&p[10];
pnpbios_parse_allocated_memresource(res, io, size);
break;
case LARGE_TAG_ANSISTR:
/* ignore this for now */
break;
case LARGE_TAG_VENDOR:
/* do nothing */
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
io = *(int *)&p[4];
size = *(int *)&p[16];
pnpbios_parse_allocated_memresource(res, io, size);
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
io = *(int *)&p[4];
size = *(int *)&p[8];
pnpbios_parse_allocated_memresource(res, io, size);
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
io = -1;
mask = p[1] + p[2] * 256;
for (i = 0; i < 16; i++, mask = mask >> 1)
if (mask & 0x01)
io = i;
pnpbios_parse_allocated_irqresource(res, io);
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
io = -1;
mask = p[1];
for (i = 0; i < 8; i++, mask = mask >> 1)
if (mask & 0x01)
io = i;
pnpbios_parse_allocated_dmaresource(res, io);
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
io = p[2] + p[3] * 256;
size = p[7];
pnpbios_parse_allocated_ioresource(res, io, size);
break;
case SMALL_TAG_VENDOR:
/* do nothing */
break;
case SMALL_TAG_FIXEDPORT:
if (len != 3)
goto len_err;
io = p[1] + p[2] * 256;
size = p[3];
pnpbios_parse_allocated_ioresource(res, io, size);
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
printk(KERN_ERR
"PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
printk(KERN_ERR
"PnPBIOS: Resource structure does not contain an end tag.\n");
return NULL;
}
/*
* Resource Configuration Options
*/
static __init void pnpbios_parse_mem_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_mem *mem;
mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
if (!mem)
return;
mem->min = ((p[5] << 8) | p[4]) << 8;
mem->max = ((p[7] << 8) | p[6]) << 8;
mem->align = (p[9] << 8) | p[8];
mem->size = ((p[11] << 8) | p[10]) << 8;
mem->flags = p[3];
pnp_register_mem_resource(option, mem);
}
static __init void pnpbios_parse_mem32_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_mem *mem;
mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
if (!mem)
return;
mem->min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
mem->max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
mem->align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
mem->size = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
mem->flags = p[3];
pnp_register_mem_resource(option, mem);
}
static __init void pnpbios_parse_fixed_mem32_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_mem *mem;
mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
if (!mem)
return;
mem->min = mem->max = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
mem->size = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
mem->align = 0;
mem->flags = p[3];
pnp_register_mem_resource(option, mem);
}
static __init void pnpbios_parse_irq_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_irq *irq;
unsigned long bits;
irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
if (!irq)
return;
bits = (p[2] << 8) | p[1];
bitmap_copy(irq->map, &bits, 16);
if (size > 2)
irq->flags = p[3];
else
irq->flags = IORESOURCE_IRQ_HIGHEDGE;
pnp_register_irq_resource(option, irq);
}
static __init void pnpbios_parse_dma_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_dma *dma;
dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
if (!dma)
return;
dma->map = p[1];
dma->flags = p[2];
pnp_register_dma_resource(option, dma);
}
static __init void pnpbios_parse_port_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_port *port;
port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
if (!port)
return;
port->min = (p[3] << 8) | p[2];
port->max = (p[5] << 8) | p[4];
port->align = p[6];
port->size = p[7];
port->flags = p[1] ? PNP_PORT_FLAG_16BITADDR : 0;
pnp_register_port_resource(option, port);
}
static __init void pnpbios_parse_fixed_port_option(unsigned char *p, int size,
struct pnp_option *option)
{
struct pnp_port *port;
port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
if (!port)
return;
port->min = port->max = (p[2] << 8) | p[1];
port->size = p[3];
port->align = 0;
port->flags = PNP_PORT_FLAG_FIXED;
pnp_register_port_resource(option, port);
}
static __init unsigned char *
pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
struct pnp_dev *dev)
{
unsigned int len, tag;
int priority = 0;
struct pnp_option *option, *option_independent;
if (!p)
return NULL;
option_independent = option = pnp_register_independent_option(dev);
if (!option)
return NULL;
while ((char *)p < (char *)end) {
/* determine the type of tag */
if (p[0] & LARGE_TAG) { /* large tag */
len = (p[2] << 8) | p[1];
tag = p[0];
} else { /* small tag */
len = p[0] & 0x07;
tag = ((p[0] >> 3) & 0x0f);
}
switch (tag) {
case LARGE_TAG_MEM:
if (len != 9)
goto len_err;
pnpbios_parse_mem_option(p, len, option);
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
pnpbios_parse_mem32_option(p, len, option);
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
pnpbios_parse_fixed_mem32_option(p, len, option);
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
pnpbios_parse_irq_option(p, len, option);
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
pnpbios_parse_dma_option(p, len, option);
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
pnpbios_parse_port_option(p, len, option);
break;
case SMALL_TAG_VENDOR:
/* do nothing */
break;
case SMALL_TAG_FIXEDPORT:
if (len != 3)
goto len_err;
pnpbios_parse_fixed_port_option(p, len, option);
break;
case SMALL_TAG_STARTDEP:
if (len > 1)
goto len_err;
priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
if (len > 0)
priority = 0x100 | p[1];
option = pnp_register_dependent_option(dev, priority);
if (!option)
return NULL;
break;
case SMALL_TAG_ENDDEP:
if (len != 0)
goto len_err;
if (option_independent == option)
printk(KERN_WARNING
"PnPBIOS: Missing SMALL_TAG_STARTDEP tag\n");
option = option_independent;
break;
case SMALL_TAG_END:
return p + 2;
default: /* an unkown tag */
len_err:
printk(KERN_ERR
"PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
printk(KERN_ERR
"PnPBIOS: Resource structure does not contain an end tag.\n");
return NULL;
}
/*
* Compatible Device IDs
*/
#define HEX(id,a) hex[((id)>>a) & 15]
#define CHAR(id,a) (0x40 + (((id)>>a) & 31))
void pnpid32_to_pnpid(u32 id, char *str)
{
const char *hex = "0123456789abcdef";
id = be32_to_cpu(id);
str[0] = CHAR(id, 26);
str[1] = CHAR(id, 21);
str[2] = CHAR(id, 16);
str[3] = HEX(id, 12);
str[4] = HEX(id, 8);
str[5] = HEX(id, 4);
str[6] = HEX(id, 0);
str[7] = '\0';
}
#undef CHAR
#undef HEX
static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
unsigned char *end,
struct pnp_dev *dev)
{
int len, tag;
char id[8];
struct pnp_id *dev_id;
if (!p)
return NULL;
while ((char *)p < (char *)end) {
/* determine the type of tag */
if (p[0] & LARGE_TAG) { /* large tag */
len = (p[2] << 8) | p[1];
tag = p[0];
} else { /* small tag */
len = p[0] & 0x07;
tag = ((p[0] >> 3) & 0x0f);
}
switch (tag) {
case LARGE_TAG_ANSISTR:
strncpy(dev->name, p + 3,
len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
dev->name[len >=
PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
break;
case SMALL_TAG_COMPATDEVID: /* compatible ID */
if (len != 4)
goto len_err;
dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
if (!dev_id)
return NULL;
pnpid32_to_pnpid(p[1] | p[2] << 8 | p[3] << 16 | p[4] <<
24, id);
memcpy(&dev_id->id, id, 7);
pnp_add_id(dev_id, dev);
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
printk(KERN_ERR
"PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
printk(KERN_ERR
"PnPBIOS: Resource structure does not contain an end tag.\n");
return NULL;
}
/*
* Allocated Resource Encoding
*/
static void pnpbios_encode_mem(unsigned char *p, struct resource *res)
{
unsigned long base = res->start;
unsigned long len = res->end - res->start + 1;
p[4] = (base >> 8) & 0xff;
p[5] = ((base >> 8) >> 8) & 0xff;
p[6] = (base >> 8) & 0xff;
p[7] = ((base >> 8) >> 8) & 0xff;
p[10] = (len >> 8) & 0xff;
p[11] = ((len >> 8) >> 8) & 0xff;
}
static void pnpbios_encode_mem32(unsigned char *p, struct resource *res)
{
unsigned long base = res->start;
unsigned long len = res->end - res->start + 1;
p[4] = base & 0xff;
p[5] = (base >> 8) & 0xff;
p[6] = (base >> 16) & 0xff;
p[7] = (base >> 24) & 0xff;
p[8] = base & 0xff;
p[9] = (base >> 8) & 0xff;
p[10] = (base >> 16) & 0xff;
p[11] = (base >> 24) & 0xff;
p[16] = len & 0xff;
p[17] = (len >> 8) & 0xff;
p[18] = (len >> 16) & 0xff;
p[19] = (len >> 24) & 0xff;
}
static void pnpbios_encode_fixed_mem32(unsigned char *p, struct resource *res)
{
unsigned long base = res->start;
unsigned long len = res->end - res->start + 1;
p[4] = base & 0xff;
p[5] = (base >> 8) & 0xff;
p[6] = (base >> 16) & 0xff;
p[7] = (base >> 24) & 0xff;
p[8] = len & 0xff;
p[9] = (len >> 8) & 0xff;
p[10] = (len >> 16) & 0xff;
p[11] = (len >> 24) & 0xff;
}
static void pnpbios_encode_irq(unsigned char *p, struct resource *res)
{
unsigned long map = 0;
map = 1 << res->start;
p[1] = map & 0xff;
p[2] = (map >> 8) & 0xff;
}
static void pnpbios_encode_dma(unsigned char *p, struct resource *res)
{
unsigned long map = 0;
map = 1 << res->start;
p[1] = map & 0xff;
}
static void pnpbios_encode_port(unsigned char *p, struct resource *res)
{
unsigned long base = res->start;
unsigned long len = res->end - res->start + 1;
p[2] = base & 0xff;
p[3] = (base >> 8) & 0xff;
p[4] = base & 0xff;
p[5] = (base >> 8) & 0xff;
p[7] = len & 0xff;
}
static void pnpbios_encode_fixed_port(unsigned char *p, struct resource *res)
{
unsigned long base = res->start;
unsigned long len = res->end - res->start + 1;
p[1] = base & 0xff;
p[2] = (base >> 8) & 0xff;
p[3] = len & 0xff;
}
static unsigned char *pnpbios_encode_allocated_resource_data(unsigned char *p,
unsigned char *end,
struct
pnp_resource_table
*res)
{
unsigned int len, tag;
int port = 0, irq = 0, dma = 0, mem = 0;
if (!p)
return NULL;
while ((char *)p < (char *)end) {
/* determine the type of tag */
if (p[0] & LARGE_TAG) { /* large tag */
len = (p[2] << 8) | p[1];
tag = p[0];
} else { /* small tag */
len = p[0] & 0x07;
tag = ((p[0] >> 3) & 0x0f);
}
switch (tag) {
case LARGE_TAG_MEM:
if (len != 9)
goto len_err;
pnpbios_encode_mem(p, &res->mem_resource[mem]);
mem++;
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
pnpbios_encode_mem32(p, &res->mem_resource[mem]);
mem++;
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
pnpbios_encode_fixed_mem32(p, &res->mem_resource[mem]);
mem++;
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
pnpbios_encode_irq(p, &res->irq_resource[irq]);
irq++;
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
pnpbios_encode_dma(p, &res->dma_resource[dma]);
dma++;
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
pnpbios_encode_port(p, &res->port_resource[port]);
port++;
break;
case SMALL_TAG_VENDOR:
/* do nothing */
break;
case SMALL_TAG_FIXEDPORT:
if (len != 3)
goto len_err;
pnpbios_encode_fixed_port(p, &res->port_resource[port]);
port++;
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
printk(KERN_ERR
"PnPBIOS: Unknown tag '0x%x', length '%d'.\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
printk(KERN_ERR
"PnPBIOS: Resource structure does not contain an end tag.\n");
return NULL;
}
/*
* Core Parsing Functions
*/
int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
struct pnp_bios_node *node)
{
unsigned char *p = (char *)node->data;
unsigned char *end = (char *)(node->data + node->size);
p = pnpbios_parse_allocated_resource_data(p, end, &dev->res);
if (!p)
return -EIO;
p = pnpbios_parse_resource_option_data(p, end, dev);
if (!p)
return -EIO;
p = pnpbios_parse_compatible_ids(p, end, dev);
if (!p)
return -EIO;
return 0;
}
int pnpbios_read_resources_from_node(struct pnp_resource_table *res,
struct pnp_bios_node *node)
{
unsigned char *p = (char *)node->data;
unsigned char *end = (char *)(node->data + node->size);
p = pnpbios_parse_allocated_resource_data(p, end, res);
if (!p)
return -EIO;
return 0;
}
int pnpbios_write_resources_to_node(struct pnp_resource_table *res,
struct pnp_bios_node *node)
{
unsigned char *p = (char *)node->data;
unsigned char *end = (char *)(node->data + node->size);
p = pnpbios_encode_allocated_resource_data(p, end, res);
if (!p)
return -EIO;
return 0;
}
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