/*
* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
*
* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/bitmap.h>
#include <linux/mutex.h>
#include "base.h"
DEFINE_MUTEX(pnp_res_mutex);
static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
{
struct resource *res;
res = pnp_get_resource(dev, IORESOURCE_IO, idx);
if (!res) {
dev_err(&dev->dev, "too many I/O port resources\n");
/* pretend we were successful so at least the manager won't try again */
return 1;
}
/* check if this resource has been manually set, if so skip */
if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
"flags %#lx\n", idx, (unsigned long long) res->start,
(unsigned long long) res->end, res->flags);
return 1;
}
/* set the initial values */
res->flags |= rule->flags | IORESOURCE_IO;
res->flags &= ~IORESOURCE_UNSET;
if (!rule->size) {
res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " io %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}
res->start = rule->min;
res->end = res->start + rule->size - 1;
/* run through until pnp_check_port is happy */
while (!pnp_check_port(dev, res)) {
res->start += rule->align;
res->end = res->start + rule->size - 1;
if (res->start > rule->max || !rule->align) {
dev_dbg(&dev->dev, " couldn't assign io %d\n", idx);
return 0;
}
}
dev_dbg(&dev->dev, " assign io %d %#llx-%#llx\n", idx,
(unsigned long long) res->start, (unsigned long long) res->end);
return 1;
}
static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
{
struct resource *res;
res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
if (!res) {
dev_err(&dev->dev, "too many memory resources\n");
/* pretend we were successful so at least the manager won't try again */
return 1;
}
/* check if this resource has been manually set, if so skip */
if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
"flags %#lx\n", idx, (unsigned long long) res->start,
(unsigned long long) res->end, res->flags);
return 1;
}
/* set the initial values */
res->flags |= rule->flags | IORESOURCE_MEM;
res->flags &= ~IORESOURCE_UNSET;
/* convert pnp flags to standard Linux flags */
if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
res->flags |= IORESOURCE_READONLY;
if (rule->flags & IORESOURCE_MEM_CACHEABLE)
res->flags |= IORESOURCE_CACHEABLE;
if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
res->flags |= IORESOURCE_RANGELENGTH;
if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
res->flags |= IORESOURCE_SHADOWABLE;
if (!rule->size) {
res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " mem %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}
res->start = rule->min;
res->end = res->start + rule->size - 1;
/* run through until pnp_check_mem is happy */
while (!pnp_check_mem(dev, res)) {
res->start += rule->align;
res->end = res->start + rule->size - 1;
if (res->start > rule->max || !rule->align) {
dev_dbg(&dev->dev, " couldn't assign mem %d\n", idx);
return 0;
}
}
dev_dbg(&dev->dev, " assign mem %d %#llx-%#llx\n", idx,
(unsigned long long) res->start, (unsigned long long) res->end);
return 1;
}
static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
{
struct resource *res;
int i;
/* IRQ priority: this table is good for i386 */
static unsigned short xtab[16] = {
5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
};
res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
if (!res) {
dev_err(&dev->dev, "too many IRQ resources\n");
/* pretend we were successful so at least the manager won't try again */
return 1;
}
/* check if this resource has been manually set, if so skip */
if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
idx, (int) res->start, res->flags);
return 1;
}
/* set the initial values */
res->flags |= rule->flags | IORESOURCE_IRQ;
res->flags &= ~IORESOURCE_UNSET;
if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " irq %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}
/* TBD: need check for >16 IRQ */
res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
if (res->start < PNP_IRQ_NR) {
res->end = res->start;
dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
(int) res->start);
return 1;
}
for (i = 0; i < 16; i++) {
if (test_bit(xtab[i], rule->map)) {
res->start = res->end = xtab[i];
if (pnp_check_irq(dev, res)) {
dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
(int) res->start);
return 1;
}
}
}
dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
return 0;
}
static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
{
struct resource *res;
int i;
/* DMA priority: this table is good for i386 */
static unsigned short xtab[8] = {
1, 3, 5, 6, 7, 0, 2, 4
};
res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
if (!res) {
dev_err(&dev->dev, "too many DMA resources\n");
return;
}
/* check if this resource has been manually set, if so skip */
if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
idx, (int) res->start, res->flags);
return;
}
/* set the initial values */
res->flags |= rule->flags | IORESOURCE_DMA;
res->flags &= ~IORESOURCE_UNSET;
for (i = 0; i < 8; i++) {
if (rule->map & (1 << xtab[i])) {
res->start = res->end = xtab[i];
if (pnp_check_dma(dev, res)) {
dev_dbg(&dev->dev, " assign dma %d %d\n", idx,
(int) res->start);
return;
}
}
}
#ifdef MAX_DMA_CHANNELS
res->start = res->end = MAX_DMA_CHANNELS;
#endif
res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " disable dma %d\n", idx);
}
void pnp_init_resource(struct resource *res)
{
unsigned long type;
type = res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_IRQ | IORESOURCE_DMA);
res->name = NULL;
res->flags = type | IORESOURCE_AUTO | IORESOURCE_UNSET;
if (type == IORESOURCE_IRQ || type == IORESOURCE_DMA) {
res->start = -1;
res->end = -1;
} else {
res->start = 0;
res->end = 0;
}
}
/**
* pnp_init_resources - Resets a resource table to default values.
* @table: pointer to the desired resource table
*/
void pnp_init_resources(struct pnp_dev *dev)
{
struct resource *res;
int idx;
for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
res = &dev->res->irq_resource[idx];
res->flags = IORESOURCE_IRQ;
pnp_init_resource(res);
}
for (idx = 0; idx < PNP_MAX_DMA; idx++) {
res = &dev->res->dma_resource[idx];
res->flags = IORESOURCE_DMA;
pnp_init_resource(res);
}
for (idx = 0; idx < PNP_MAX_PORT; idx++) {
res = &dev->res->port_resource[idx];
res->flags = IORESOURCE_IO;
pnp_init_resource(res);
}
for (idx = 0; idx < PNP_MAX_MEM; idx++) {
res = &dev->res->mem_resource[idx];
res->flags = IORESOURCE_MEM;
pnp_init_resource(res);
}
}
/**
* pnp_clean_resources - clears resources that were not manually set
* @res: the resources to clean
*/
static void pnp_clean_resource_table(struct pnp_dev *dev)
{
struct resource *res;
int idx;
for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
res = &dev->res->irq_resource[idx];
if (res->flags & IORESOURCE_AUTO) {
res->flags = IORESOURCE_IRQ;
pnp_init_resource(res);
}
}
for (idx = 0; idx < PNP_MAX_DMA; idx++) {
res = &dev->res->dma_resource[idx];
if (res->flags & IORESOURCE_AUTO) {
res->flags = IORESOURCE_DMA;
pnp_init_resource(res);
}
}
for (idx = 0; idx < PNP_MAX_PORT; idx++) {
res = &dev->res->port_resource[idx];
if (res->flags & IORESOURCE_AUTO) {
res->flags = IORESOURCE_IO;
pnp_init_resource(res);
}
}
for (idx = 0; idx < PNP_MAX_MEM; idx++) {
res = &dev->res->mem_resource[idx];
if (res->flags & IORESOURCE_AUTO) {
res->flags = IORESOURCE_MEM;
pnp_init_resource(res);
}
}
}
/**
* pnp_assign_resources - assigns resources to the device based on the specified dependent number
* @dev: pointer to the desired device
* @depnum: the dependent function number
*
* Only set depnum to 0 if the device does not have dependent options.
*/
static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
{
struct pnp_port *port;
struct pnp_mem *mem;
struct pnp_irq *irq;
struct pnp_dma *dma;
int nport = 0, nmem = 0, nirq = 0, ndma = 0;
if (!pnp_can_configure(dev))
return -ENODEV;
dbg_pnp_show_resources(dev, "before pnp_assign_resources");
mutex_lock(&pnp_res_mutex);
pnp_clean_resource_table(dev);
if (dev->independent) {
dev_dbg(&dev->dev, "assigning independent options\n");
port = dev->independent->port;
mem = dev->independent->mem;
irq = dev->independent->irq;
dma = dev->independent->dma;
while (port) {
if (!pnp_assign_port(dev, port, nport))
goto fail;
nport++;
port = port->next;
}
while (mem) {
if (!pnp_assign_mem(dev, mem, nmem))
goto fail;
nmem++;
mem = mem->next;
}
while (irq) {
if (!pnp_assign_irq(dev, irq, nirq))
goto fail;
nirq++;
irq = irq->next;
}
while (dma) {
pnp_assign_dma(dev, dma, ndma);
ndma++;
dma = dma->next;
}
}
if (depnum) {
struct pnp_option *dep;
int i;
dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
for (i = 1, dep = dev->dependent; i < depnum;
i++, dep = dep->next)
if (!dep)
goto fail;
port = dep->port;
mem = dep->mem;
irq = dep->irq;
dma = dep->dma;
while (port) {
if (!pnp_assign_port(dev, port, nport))
goto fail;
nport++;
port = port->next;
}
while (mem) {
if (!pnp_assign_mem(dev, mem, nmem))
goto fail;
nmem++;
mem = mem->next;
}
while (irq) {
if (!pnp_assign_irq(dev, irq, nirq))
goto fail;
nirq++;
irq = irq->next;
}
while (dma) {
pnp_assign_dma(dev, dma, ndma);
ndma++;
dma = dma->next;
}
} else if (dev->dependent)
goto fail;
mutex_unlock(&pnp_res_mutex);
dbg_pnp_show_resources(dev, "after pnp_assign_resources");
return 1;
fail:
pnp_clean_resource_table(dev);
mutex_unlock(&pnp_res_mutex);
dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
return 0;
}
/**
* pnp_auto_config_dev - automatically assigns resources to a device
* @dev: pointer to the desired device
*/
int pnp_auto_config_dev(struct pnp_dev *dev)
{
struct pnp_option *dep;
int i = 1;
if (!pnp_can_configure(dev)) {
dev_dbg(&dev->dev, "configuration not supported\n");
return -ENODEV;
}
if (!dev->dependent) {
if (pnp_assign_resources(dev, 0))
return 0;
} else {
dep = dev->dependent;
do {
if (pnp_assign_resources(dev, i))
return 0;
dep = dep->next;
i++;
} while (dep);
}
dev_err(&dev->dev, "unable to assign resources\n");
return -EBUSY;
}
/**
* pnp_start_dev - low-level start of the PnP device
* @dev: pointer to the desired device
*
* assumes that resources have already been allocated
*/
int pnp_start_dev(struct pnp_dev *dev)
{
if (!pnp_can_write(dev)) {
dev_dbg(&dev->dev, "activation not supported\n");
return -EINVAL;
}
dbg_pnp_show_resources(dev, "pnp_start_dev");
if (dev->protocol->set(dev) < 0) {
dev_err(&dev->dev, "activation failed\n");
return -EIO;
}
dev_info(&dev->dev, "activated\n");
return 0;
}
/**
* pnp_stop_dev - low-level disable of the PnP device
* @dev: pointer to the desired device
*
* does not free resources
*/
int pnp_stop_dev(struct pnp_dev *dev)
{
if (!pnp_can_disable(dev)) {
dev_dbg(&dev->dev, "disabling not supported\n");
return -EINVAL;
}
if (dev->protocol->disable(dev) < 0) {
dev_err(&dev->dev, "disable failed\n");
return -EIO;
}
dev_info(&dev->dev, "disabled\n");
return 0;
}
/**
* pnp_activate_dev - activates a PnP device for use
* @dev: pointer to the desired device
*
* does not validate or set resources so be careful.
*/
int pnp_activate_dev(struct pnp_dev *dev)
{
int error;
if (dev->active)
return 0;
/* ensure resources are allocated */
if (pnp_auto_config_dev(dev))
return -EBUSY;
error = pnp_start_dev(dev);
if (error)
return error;
dev->active = 1;
return 0;
}
/**
* pnp_disable_dev - disables device
* @dev: pointer to the desired device
*
* inform the correct pnp protocol so that resources can be used by other devices
*/
int pnp_disable_dev(struct pnp_dev *dev)
{
int error;
if (!dev->active)
return 0;
error = pnp_stop_dev(dev);
if (error)
return error;
dev->active = 0;
/* release the resources so that other devices can use them */
mutex_lock(&pnp_res_mutex);
pnp_clean_resource_table(dev);
mutex_unlock(&pnp_res_mutex);
return 0;
}
EXPORT_SYMBOL(pnp_start_dev);
EXPORT_SYMBOL(pnp_stop_dev);
EXPORT_SYMBOL(pnp_activate_dev);
EXPORT_SYMBOL(pnp_disable_dev);