linux/drivers/pnp/pnpbios/rsparser.c

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/*
* 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 "../base.h"
#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_ioresource(struct pnp_dev *dev,
int start, int len)
{
int flags = 0;
int end = start + len - 1;
if (len <= 0 || end >= 0x10003)
flags |= IORESOURCE_DISABLED;
pnp_add_io_resource(dev, start, end, flags);
}
static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev,
int mem, int len)
{
struct resource *res;
int i;
for (i = 0; i < PNP_MAX_MEM; i++) {
res = pnp_get_resource(dev, IORESOURCE_MEM, i);
if (!pnp_resource_valid(res))
break;
}
if (i < PNP_MAX_MEM) {
res->flags = IORESOURCE_MEM; // Also clears _UNSET flag
if (len <= 0) {
res->flags |= IORESOURCE_DISABLED;
return;
}
res->start = (unsigned long)mem;
res->end = (unsigned long)(mem + len - 1);
}
}
static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
unsigned char *p,
unsigned char *end)
{
unsigned int len, tag;
int io, size, mask, i, flags;
if (!p)
return NULL;
dev_dbg(&dev->dev, "parse allocated resources\n");
pnp_init_resources(dev);
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(dev, 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(dev, 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(dev, io, size);
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
flags = 0;
io = -1;
mask = p[1] + p[2] * 256;
for (i = 0; i < 16; i++, mask = mask >> 1)
if (mask & 0x01)
io = i;
if (io != -1)
pcibios_penalize_isa_irq(io, 1);
else
flags = IORESOURCE_DISABLED;
pnp_add_irq_resource(dev, io, flags);
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
flags = 0;
io = -1;
mask = p[1];
for (i = 0; i < 8; i++, mask = mask >> 1)
if (mask & 0x01)
io = i;
if (io == -1)
flags = IORESOURCE_DISABLED;
pnp_add_dma_resource(dev, io, flags);
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
io = p[2] + p[3] * 256;
size = p[7];
pnpbios_parse_allocated_ioresource(dev, 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(dev, io, size);
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
dev_err(&dev->dev, "unknown tag %#x length %d\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
dev_err(&dev->dev, "no end tag in resource structure\n");
return NULL;
}
/*
* Resource Configuration Options
*/
static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
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(dev, option, mem);
}
static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
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(dev, option, mem);
}
static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
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(dev, option, mem);
}
static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
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(dev, option, irq);
}
static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
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(dev, option, dma);
}
static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
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(dev, option, port);
}
static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
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(dev, 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;
dev_dbg(&dev->dev, "parse resource options\n");
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(dev, p, len, option);
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
pnpbios_parse_mem32_option(dev, p, len, option);
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
pnpbios_parse_fixed_mem32_option(dev, p, len, option);
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
pnpbios_parse_irq_option(dev, p, len, option);
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
pnpbios_parse_dma_option(dev, p, len, option);
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
pnpbios_parse_port_option(dev, 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(dev, 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)
dev_warn(&dev->dev, "missing "
"SMALL_TAG_STARTDEP tag\n");
option = option_independent;
dev_dbg(&dev->dev, "end dependent options\n");
break;
case SMALL_TAG_END:
return p + 2;
default: /* an unkown tag */
len_err:
dev_err(&dev->dev, "unknown tag %#x length %d\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
dev_err(&dev->dev, "no end tag in resource structure\n");
return NULL;
}
/*
* Compatible Device IDs
*/
static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
unsigned char *end,
struct pnp_dev *dev)
{
int len, tag;
u32 eisa_id;
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;
eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
dev_id = pnp_add_id(dev, id);
if (!dev_id)
return NULL;
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
dev_err(&dev->dev, "unknown tag %#x length %d\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
dev_err(&dev->dev, "no end tag in resource structure\n");
return NULL;
}
/*
* Allocated Resource Encoding
*/
static void pnpbios_encode_mem(struct pnp_dev *dev, 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;
dev_dbg(&dev->dev, " encode mem %#llx-%#llx\n",
(unsigned long long) res->start, (unsigned long long) res->end);
}
static void pnpbios_encode_mem32(struct pnp_dev *dev, 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;
dev_dbg(&dev->dev, " encode mem32 %#llx-%#llx\n",
(unsigned long long) res->start, (unsigned long long) res->end);
}
static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, 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;
dev_dbg(&dev->dev, " encode fixed_mem32 %#llx-%#llx\n",
(unsigned long long) res->start, (unsigned long long) res->end);
}
static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long map = 0;
map = 1 << res->start;
p[1] = map & 0xff;
p[2] = (map >> 8) & 0xff;
dev_dbg(&dev->dev, " encode irq %d\n", res->start);
}
static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long map = 0;
map = 1 << res->start;
p[1] = map & 0xff;
dev_dbg(&dev->dev, " encode dma %d\n", res->start);
}
static void pnpbios_encode_port(struct pnp_dev *dev, 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;
dev_dbg(&dev->dev, " encode io %#llx-%#llx\n",
(unsigned long long) res->start, (unsigned long long) res->end);
}
static void pnpbios_encode_fixed_port(struct pnp_dev *dev, 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;
dev_dbg(&dev->dev, " encode fixed_io %#llx-%#llx\n",
(unsigned long long) res->start, (unsigned long long) res->end);
}
static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
*dev,
unsigned char *p,
unsigned char *end)
{
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(dev, p,
pnp_get_resource(dev, IORESOURCE_MEM, mem));
mem++;
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
pnpbios_encode_mem32(dev, p,
pnp_get_resource(dev, IORESOURCE_MEM, mem));
mem++;
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
pnpbios_encode_fixed_mem32(dev, p,
pnp_get_resource(dev, IORESOURCE_MEM, mem));
mem++;
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
pnpbios_encode_irq(dev, p,
pnp_get_resource(dev, IORESOURCE_IRQ, irq));
irq++;
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
pnpbios_encode_dma(dev, p,
pnp_get_resource(dev, IORESOURCE_DMA, dma));
dma++;
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
pnpbios_encode_port(dev, p,
pnp_get_resource(dev, IORESOURCE_IO, port));
port++;
break;
case SMALL_TAG_VENDOR:
/* do nothing */
break;
case SMALL_TAG_FIXEDPORT:
if (len != 3)
goto len_err;
pnpbios_encode_fixed_port(dev, p,
pnp_get_resource(dev, IORESOURCE_IO, port));
port++;
break;
case SMALL_TAG_END:
p = p + 2;
return (unsigned char *)p;
break;
default: /* an unkown tag */
len_err:
dev_err(&dev->dev, "unknown tag %#x length %d\n",
tag, len);
break;
}
/* continue to the next tag */
if (p[0] & LARGE_TAG)
p += len + 3;
else
p += len + 1;
}
dev_err(&dev->dev, "no end tag in resource structure\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(dev, p, end);
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_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(dev, p, end);
if (!p)
return -EIO;
return 0;
}
int pnpbios_write_resources_to_node(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_encode_allocated_resource_data(dev, p, end);
if (!p)
return -EIO;
return 0;
}