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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pnp/manager.c
downloadlinux-linaro-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/pnp/manager.c')
-rw-r--r--drivers/pnp/manager.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/drivers/pnp/manager.c b/drivers/pnp/manager.c
new file mode 100644
index 000000000000..639e04253482
--- /dev/null
+++ b/drivers/pnp/manager.c
@@ -0,0 +1,566 @@
+/*
+ * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
+ *
+ * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
+ * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#ifdef CONFIG_PNP_DEBUG
+ #define DEBUG
+#else
+ #undef DEBUG
+#endif
+
+#include <linux/pnp.h>
+#include "base.h"
+
+DECLARE_MUTEX(pnp_res_mutex);
+
+static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
+{
+ unsigned long *start, *end, *flags;
+
+ if (!dev || !rule)
+ return -EINVAL;
+
+ if (idx >= PNP_MAX_PORT) {
+ pnp_err("More than 4 ports is incompatible with pnp specifications.");
+ /* 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 (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
+ return 1;
+
+ start = &dev->res.port_resource[idx].start;
+ end = &dev->res.port_resource[idx].end;
+ flags = &dev->res.port_resource[idx].flags;
+
+ /* set the initial values */
+ *flags |= rule->flags | IORESOURCE_IO;
+ *flags &= ~IORESOURCE_UNSET;
+
+ if (!rule->size) {
+ *flags |= IORESOURCE_DISABLED;
+ return 1; /* skip disabled resource requests */
+ }
+
+ *start = rule->min;
+ *end = *start + rule->size - 1;
+
+ /* run through until pnp_check_port is happy */
+ while (!pnp_check_port(dev, idx)) {
+ *start += rule->align;
+ *end = *start + rule->size - 1;
+ if (*start > rule->max || !rule->align)
+ return 0;
+ }
+ return 1;
+}
+
+static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
+{
+ unsigned long *start, *end, *flags;
+
+ if (!dev || !rule)
+ return -EINVAL;
+
+ if (idx >= PNP_MAX_MEM) {
+ pnp_err("More than 8 mems is incompatible with pnp specifications.");
+ /* 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 (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
+ return 1;
+
+ start = &dev->res.mem_resource[idx].start;
+ end = &dev->res.mem_resource[idx].end;
+ flags = &dev->res.mem_resource[idx].flags;
+
+ /* set the initial values */
+ *flags |= rule->flags | IORESOURCE_MEM;
+ *flags &= ~IORESOURCE_UNSET;
+
+ /* convert pnp flags to standard Linux flags */
+ if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
+ *flags |= IORESOURCE_READONLY;
+ if (rule->flags & IORESOURCE_MEM_CACHEABLE)
+ *flags |= IORESOURCE_CACHEABLE;
+ if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
+ *flags |= IORESOURCE_RANGELENGTH;
+ if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
+ *flags |= IORESOURCE_SHADOWABLE;
+
+ if (!rule->size) {
+ *flags |= IORESOURCE_DISABLED;
+ return 1; /* skip disabled resource requests */
+ }
+
+ *start = rule->min;
+ *end = *start + rule->size -1;
+
+ /* run through until pnp_check_mem is happy */
+ while (!pnp_check_mem(dev, idx)) {
+ *start += rule->align;
+ *end = *start + rule->size - 1;
+ if (*start > rule->max || !rule->align)
+ return 0;
+ }
+ return 1;
+}
+
+static int pnp_assign_irq(struct pnp_dev * dev, struct pnp_irq *rule, int idx)
+{
+ unsigned long *start, *end, *flags;
+ 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
+ };
+
+ if (!dev || !rule)
+ return -EINVAL;
+
+ if (idx >= PNP_MAX_IRQ) {
+ pnp_err("More than 2 irqs is incompatible with pnp specifications.");
+ /* 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 (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
+ return 1;
+
+ start = &dev->res.irq_resource[idx].start;
+ end = &dev->res.irq_resource[idx].end;
+ flags = &dev->res.irq_resource[idx].flags;
+
+ /* set the initial values */
+ *flags |= rule->flags | IORESOURCE_IRQ;
+ *flags &= ~IORESOURCE_UNSET;
+
+ if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
+ *flags |= IORESOURCE_DISABLED;
+ return 1; /* skip disabled resource requests */
+ }
+
+ /* TBD: need check for >16 IRQ */
+ *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
+ if (*start < PNP_IRQ_NR) {
+ *end = *start;
+ return 1;
+ }
+ for (i = 0; i < 16; i++) {
+ if(test_bit(xtab[i], rule->map)) {
+ *start = *end = xtab[i];
+ if(pnp_check_irq(dev, idx))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
+{
+ unsigned long *start, *end, *flags;
+ int i;
+
+ /* DMA priority: this table is good for i386 */
+ static unsigned short xtab[8] = {
+ 1, 3, 5, 6, 7, 0, 2, 4
+ };
+
+ if (!dev || !rule)
+ return -EINVAL;
+
+ if (idx >= PNP_MAX_DMA) {
+ pnp_err("More than 2 dmas is incompatible with pnp specifications.");
+ /* 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 (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
+ return 1;
+
+ start = &dev->res.dma_resource[idx].start;
+ end = &dev->res.dma_resource[idx].end;
+ flags = &dev->res.dma_resource[idx].flags;
+
+ /* set the initial values */
+ *flags |= rule->flags | IORESOURCE_DMA;
+ *flags &= ~IORESOURCE_UNSET;
+
+ if (!rule->map) {
+ *flags |= IORESOURCE_DISABLED;
+ return 1; /* skip disabled resource requests */
+ }
+
+ for (i = 0; i < 8; i++) {
+ if(rule->map & (1<<xtab[i])) {
+ *start = *end = xtab[i];
+ if(pnp_check_dma(dev, idx))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/**
+ * pnp_init_resources - Resets a resource table to default values.
+ * @table: pointer to the desired resource table
+ *
+ */
+void pnp_init_resource_table(struct pnp_resource_table *table)
+{
+ int idx;
+ for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
+ table->irq_resource[idx].name = NULL;
+ table->irq_resource[idx].start = -1;
+ table->irq_resource[idx].end = -1;
+ table->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_DMA; idx++) {
+ table->dma_resource[idx].name = NULL;
+ table->dma_resource[idx].start = -1;
+ table->dma_resource[idx].end = -1;
+ table->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_PORT; idx++) {
+ table->port_resource[idx].name = NULL;
+ table->port_resource[idx].start = 0;
+ table->port_resource[idx].end = 0;
+ table->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_MEM; idx++) {
+ table->mem_resource[idx].name = NULL;
+ table->mem_resource[idx].start = 0;
+ table->mem_resource[idx].end = 0;
+ table->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+}
+
+/**
+ * pnp_clean_resources - clears resources that were not manually set
+ * @res - the resources to clean
+ *
+ */
+static void pnp_clean_resource_table(struct pnp_resource_table * res)
+{
+ int idx;
+ for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
+ if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
+ continue;
+ res->irq_resource[idx].start = -1;
+ res->irq_resource[idx].end = -1;
+ res->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_DMA; idx++) {
+ if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
+ continue;
+ res->dma_resource[idx].start = -1;
+ res->dma_resource[idx].end = -1;
+ res->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_PORT; idx++) {
+ if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
+ continue;
+ res->port_resource[idx].start = 0;
+ res->port_resource[idx].end = 0;
+ res->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+ for (idx = 0; idx < PNP_MAX_MEM; idx++) {
+ if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
+ continue;
+ res->mem_resource[idx].start = 0;
+ res->mem_resource[idx].end = 0;
+ res->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
+ }
+}
+
+/**
+ * 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;
+
+ down(&pnp_res_mutex);
+ pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
+ if (dev->independent) {
+ 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) {
+ if (!pnp_assign_dma(dev, dma, ndma))
+ goto fail;
+ ndma++;
+ dma = dma->next;
+ }
+ }
+
+ if (depnum) {
+ struct pnp_option *dep;
+ int i;
+ 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) {
+ if (!pnp_assign_dma(dev, dma, ndma))
+ goto fail;
+ ndma++;
+ dma = dma->next;
+ }
+ } else if (dev->dependent)
+ goto fail;
+
+ up(&pnp_res_mutex);
+ return 1;
+
+fail:
+ pnp_clean_resource_table(&dev->res);
+ up(&pnp_res_mutex);
+ return 0;
+}
+
+/**
+ * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
+ * @dev: pointer to the desired device
+ * @res: pointer to the new resource config
+ *
+ * This function can be used by drivers that want to manually set thier resources.
+ */
+int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table * res, int mode)
+{
+ int i;
+ struct pnp_resource_table * bak;
+ if (!dev || !res)
+ return -EINVAL;
+ if (!pnp_can_configure(dev))
+ return -ENODEV;
+ bak = pnp_alloc(sizeof(struct pnp_resource_table));
+ if (!bak)
+ return -ENOMEM;
+ *bak = dev->res;
+
+ down(&pnp_res_mutex);
+ dev->res = *res;
+ if (!(mode & PNP_CONFIG_FORCE)) {
+ for (i = 0; i < PNP_MAX_PORT; i++) {
+ if(!pnp_check_port(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_MEM; i++) {
+ if(!pnp_check_mem(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_IRQ; i++) {
+ if(!pnp_check_irq(dev,i))
+ goto fail;
+ }
+ for (i = 0; i < PNP_MAX_DMA; i++) {
+ if(!pnp_check_dma(dev,i))
+ goto fail;
+ }
+ }
+ up(&pnp_res_mutex);
+
+ kfree(bak);
+ return 0;
+
+fail:
+ dev->res = *bak;
+ up(&pnp_res_mutex);
+ kfree(bak);
+ return -EINVAL;
+}
+
+/**
+ * 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(!dev)
+ return -EINVAL;
+
+ if(!pnp_can_configure(dev)) {
+ pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id);
+ 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);
+ }
+
+ pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
+ return -EBUSY;
+}
+
+/**
+ * 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)
+{
+ if (!dev)
+ return -EINVAL;
+ if (dev->active) {
+ return 0; /* the device is already active */
+ }
+
+ /* ensure resources are allocated */
+ if (pnp_auto_config_dev(dev))
+ return -EBUSY;
+
+ if (!pnp_can_write(dev)) {
+ pnp_info("Device %s does not supported activation.", dev->dev.bus_id);
+ return -EINVAL;
+ }
+
+ if (dev->protocol->set(dev, &dev->res)<0) {
+ pnp_err("Failed to activate device %s.", dev->dev.bus_id);
+ return -EIO;
+ }
+
+ dev->active = 1;
+ pnp_info("Device %s activated.", dev->dev.bus_id);
+
+ return 1;
+}
+
+/**
+ * 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)
+{
+ if (!dev)
+ return -EINVAL;
+ if (!dev->active) {
+ return 0; /* the device is already disabled */
+ }
+
+ if (!pnp_can_disable(dev)) {
+ pnp_info("Device %s does not supported disabling.", dev->dev.bus_id);
+ return -EINVAL;
+ }
+ if (dev->protocol->disable(dev)<0) {
+ pnp_err("Failed to disable device %s.", dev->dev.bus_id);
+ return -EIO;
+ }
+
+ dev->active = 0;
+ pnp_info("Device %s disabled.", dev->dev.bus_id);
+
+ /* release the resources so that other devices can use them */
+ down(&pnp_res_mutex);
+ pnp_clean_resource_table(&dev->res);
+ up(&pnp_res_mutex);
+
+ return 1;
+}
+
+/**
+ * pnp_resource_change - change one resource
+ * @resource: pointer to resource to be changed
+ * @start: start of region
+ * @size: size of region
+ *
+ */
+void pnp_resource_change(struct resource *resource, unsigned long start, unsigned long size)
+{
+ if (resource == NULL)
+ return;
+ resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
+ resource->start = start;
+ resource->end = start + size - 1;
+}
+
+
+EXPORT_SYMBOL(pnp_manual_config_dev);
+EXPORT_SYMBOL(pnp_auto_config_dev);
+EXPORT_SYMBOL(pnp_activate_dev);
+EXPORT_SYMBOL(pnp_disable_dev);
+EXPORT_SYMBOL(pnp_resource_change);
+EXPORT_SYMBOL(pnp_init_resource_table);