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linux/drivers/pnp/pnpbios/rsparser.c
Bjorn Helgaas 1f32ca31e7 PNP: convert resource options to single linked list 
ISAPNP, PNPBIOS, and ACPI describe the "possible resource settings" of
a device, i.e., the possibilities an OS bus driver has when it assigns
I/O port, MMIO, and other resources to the device.

PNP used to maintain this "possible resource setting" information in
one independent option structure and a list of dependent option
structures for each device.  Each of these option structures had lists
of I/O, memory, IRQ, and DMA resources, for example:

  dev
    independent options
      ind-io0  -> ind-io1  ...
      ind-mem0 -> ind-mem1 ...
      ...
    dependent option set 0
      dep0-io0  -> dep0-io1  ...
      dep0-mem0 -> dep0-mem1 ...
      ...
    dependent option set 1
      dep1-io0  -> dep1-io1  ...
      dep1-mem0 -> dep1-mem1 ...
      ...
    ...

This data structure was designed for ISAPNP, where the OS configures
device resource settings by writing directly to configuration
registers.  The OS can write the registers in arbitrary order much
like it writes PCI BARs.

However, for PNPBIOS and ACPI devices, the OS uses firmware interfaces
that perform device configuration, and it is important to pass the
desired settings to those interfaces in the correct order.  The OS
learns the correct order by using firmware interfaces that return the
"current resource settings" and "possible resource settings," but the
option structures above doesn't store the ordering information.

This patch replaces the independent and dependent lists with a single
list of options.  For example, a device might have possible resource
settings like this:

  dev
    options
      ind-io0 -> dep0-io0 -> dep1->io0 -> ind-io1 ...

All the possible settings are in the same list, in the order they
come from the firmware "possible resource settings" list.  Each entry
is tagged with an independent/dependent flag.  Dependent entries also
have a "set number" and an optional priority value.  All dependent
entries must be assigned from the same set.  For example, the OS can
use all the entries from dependent set 0, or all the entries from
dependent set 1, but it cannot mix entries from set 0 with entries
from set 1.

Prior to this patch PNP didn't keep track of the order of this list,
and it assigned all independent options first, then all dependent
ones.  Using the example above, that resulted in a "desired
configuration" list like this:

  ind->io0 -> ind->io1 -> depN-io0 ...

instead of the list the firmware expects, which looks like this:

  ind->io0 -> depN-io0 -> ind-io1 ...

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-07-16 23:27:07 +02:00

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/*
* rsparser.c - parses and encodes pnpbios resource data streams
*/
#include <linux/ctype.h>
#include <linux/pnp.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 start, int len)
{
int flags = 0;
int end = start + len - 1;
if (len <= 0)
flags |= IORESOURCE_DISABLED;
pnp_add_mem_resource(dev, start, end, flags);
}
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,
unsigned int option_flags)
{
resource_size_t min, max, align, len;
unsigned char flags;
min = ((p[5] << 8) | p[4]) << 8;
max = ((p[7] << 8) | p[6]) << 8;
align = (p[9] << 8) | p[8];
len = ((p[11] << 8) | p[10]) << 8;
flags = p[3];
pnp_register_mem_resource(dev, option_flags, min, max, align, len,
flags);
}
static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
resource_size_t min, max, align, len;
unsigned char flags;
min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
flags = p[3];
pnp_register_mem_resource(dev, option_flags, min, max, align, len,
flags);
}
static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
resource_size_t base, len;
unsigned char flags;
base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
flags = p[3];
pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
}
static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
unsigned long bits;
pnp_irq_mask_t map;
unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
bits = (p[2] << 8) | p[1];
bitmap_zero(map.bits, PNP_IRQ_NR);
bitmap_copy(map.bits, &bits, 16);
if (size > 2)
flags = p[3];
pnp_register_irq_resource(dev, option_flags, &map, flags);
}
static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
pnp_register_dma_resource(dev, option_flags, p[1], p[2]);
}
static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
resource_size_t min, max, align, len;
unsigned char flags;
min = (p[3] << 8) | p[2];
max = (p[5] << 8) | p[4];
align = p[6];
len = p[7];
flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
pnp_register_port_resource(dev, option_flags, min, max, align, len,
flags);
}
static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
unsigned char *p, int size,
unsigned int option_flags)
{
resource_size_t base, len;
base = (p[2] << 8) | p[1];
len = p[3];
pnp_register_port_resource(dev, option_flags, base, base, 0, len,
IORESOURCE_IO_FIXED);
}
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;
unsigned int option_flags;
if (!p)
return NULL;
dev_dbg(&dev->dev, "parse resource options\n");
option_flags = 0;
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_flags);
break;
case LARGE_TAG_MEM32:
if (len != 17)
goto len_err;
pnpbios_parse_mem32_option(dev, p, len, option_flags);
break;
case LARGE_TAG_FIXEDMEM32:
if (len != 9)
goto len_err;
pnpbios_parse_fixed_mem32_option(dev, p, len,
option_flags);
break;
case SMALL_TAG_IRQ:
if (len < 2 || len > 3)
goto len_err;
pnpbios_parse_irq_option(dev, p, len, option_flags);
break;
case SMALL_TAG_DMA:
if (len != 2)
goto len_err;
pnpbios_parse_dma_option(dev, p, len, option_flags);
break;
case SMALL_TAG_PORT:
if (len != 7)
goto len_err;
pnpbios_parse_port_option(dev, p, len, option_flags);
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_flags);
break;
case SMALL_TAG_STARTDEP:
if (len > 1)
goto len_err;
priority = PNP_RES_PRIORITY_ACCEPTABLE;
if (len > 0)
priority = p[1];
option_flags = pnp_new_dependent_set(dev, priority);
break;
case SMALL_TAG_ENDDEP:
if (len != 0)
goto len_err;
option_flags = 0;
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;
unsigned long len;
if (pnp_resource_enabled(res)) {
base = res->start;
len = res->end - res->start + 1;
} else {
base = 0;
len = 0;
}
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 %#lx-%#lx\n", base, base + len - 1);
}
static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long base;
unsigned long len;
if (pnp_resource_enabled(res)) {
base = res->start;
len = res->end - res->start + 1;
} else {
base = 0;
len = 0;
}
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 %#lx-%#lx\n", base, base + len - 1);
}
static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long base;
unsigned long len;
if (pnp_resource_enabled(res)) {
base = res->start;
len = res->end - res->start + 1;
} else {
base = 0;
len = 0;
}
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 %#lx-%#lx\n", base,
base + len - 1);
}
static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long map;
if (pnp_resource_enabled(res))
map = 1 << res->start;
else
map = 0;
p[1] = map & 0xff;
p[2] = (map >> 8) & 0xff;
dev_dbg(&dev->dev, " encode irq mask %#lx\n", map);
}
static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long map;
if (pnp_resource_enabled(res))
map = 1 << res->start;
else
map = 0;
p[1] = map & 0xff;
dev_dbg(&dev->dev, " encode dma mask %#lx\n", map);
}
static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
struct resource *res)
{
unsigned long base;
unsigned long len;
if (pnp_resource_enabled(res)) {
base = res->start;
len = res->end - res->start + 1;
} else {
base = 0;
len = 0;
}
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 %#lx-%#lx\n", base, base + len - 1);
}
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;
if (pnp_resource_enabled(res)) {
base = res->start;
len = res->end - res->start + 1;
} else {
base = 0;
len = 0;
}
p[1] = base & 0xff;
p[2] = (base >> 8) & 0xff;
p[3] = len & 0xff;
dev_dbg(&dev->dev, " encode fixed_io %#lx-%#lx\n", base,
base + len - 1);
}
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;
}
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