--- /dev/null
+/*
+ * 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>
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pnp.h>
+#include <linux/bitmap.h>
+#include <linux/mutex.h>
+#include "base.h"
+
+DEFINE_MUTEX(pnp_res_mutex);
+
+static struct resource *pnp_find_resource(struct pnp_dev *dev,
+ unsigned char rule,
+ unsigned long type,
+ unsigned int bar)
+{
+ struct resource *res = pnp_get_resource(dev, type, bar);
+
+ /* when the resource already exists, set its resource bits from rule */
+ if (res) {
+ res->flags &= ~IORESOURCE_BITS;
+ res->flags |= rule & IORESOURCE_BITS;
+ }
+
+ return res;
+}
+
+static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
+{
+ struct resource *res, local_res;
+
+ res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);
+ if (res) {
+ pnp_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 0;
+ }
+
+ res = &local_res;
+ res->flags = rule->flags | IORESOURCE_AUTO;
+ res->start = 0;
+ res->end = 0;
+
+ if (!rule->size) {
+ res->flags |= IORESOURCE_DISABLED;
+ pnp_dbg(&dev->dev, " io %d disabled\n", idx);
+ goto __add;
+ }
+
+ res->start = rule->min;
+ res->end = res->start + rule->size - 1;
+
+ while (!pnp_check_port(dev, res)) {
+ res->start += rule->align;
+ res->end = res->start + rule->size - 1;
+ if (res->start > rule->max || !rule->align) {
+ pnp_dbg(&dev->dev, " couldn't assign io %d "
+ "(min %#llx max %#llx)\n", idx,
+ (unsigned long long) rule->min,
+ (unsigned long long) rule->max);
+ return -EBUSY;
+ }
+ }
+
+__add:
+ pnp_add_io_resource(dev, res->start, res->end, res->flags);
+ return 0;
+}
+
+static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
+{
+ struct resource *res, local_res;
+
+ res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);
+ if (res) {
+ pnp_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 0;
+ }
+
+ res = &local_res;
+ res->flags = rule->flags | IORESOURCE_AUTO;
+ res->start = 0;
+ res->end = 0;
+
+ /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */
+ 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;
+ pnp_dbg(&dev->dev, " mem %d disabled\n", idx);
+ goto __add;
+ }
+
+ res->start = rule->min;
+ res->end = res->start + rule->size - 1;
+
+ while (!pnp_check_mem(dev, res)) {
+ res->start += rule->align;
+ res->end = res->start + rule->size - 1;
+ if (res->start > rule->max || !rule->align) {
+ pnp_dbg(&dev->dev, " couldn't assign mem %d "
+ "(min %#llx max %#llx)\n", idx,
+ (unsigned long long) rule->min,
+ (unsigned long long) rule->max);
+ return -EBUSY;
+ }
+ }
+
+__add:
+ pnp_add_mem_resource(dev, res->start, res->end, res->flags);
+ return 0;
+}
+
+static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
+{
+ struct resource *res, local_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_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);
+ if (res) {
+ pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
+ idx, (int) res->start, res->flags);
+ return 0;
+ }
+
+ res = &local_res;
+ res->flags = rule->flags | IORESOURCE_AUTO;
+ res->start = -1;
+ res->end = -1;
+
+ if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
+ res->flags |= IORESOURCE_DISABLED;
+ pnp_dbg(&dev->dev, " irq %d disabled\n", idx);
+ goto __add;
+ }
+
+ /* TBD: need check for >16 IRQ */
+ res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
+ if (res->start < PNP_IRQ_NR) {
+ res->end = res->start;
+ goto __add;
+ }
+ for (i = 0; i < 16; i++) {
+ if (test_bit(xtab[i], rule->map.bits)) {
+ res->start = res->end = xtab[i];
+ if (pnp_check_irq(dev, res))
+ goto __add;
+ }
+ }
+
+ if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
+ res->start = -1;
+ res->end = -1;
+ res->flags |= IORESOURCE_DISABLED;
+ pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
+ goto __add;
+ }
+
+ pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
+ return -EBUSY;
+
+__add:
+ pnp_add_irq_resource(dev, res->start, res->flags);
+ return 0;
+}
+
+#ifdef CONFIG_ISA_DMA_API
+static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
+{
+ struct resource *res, local_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_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);
+ if (res) {
+ pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
+ idx, (int) res->start, res->flags);
+ return 0;
+ }
+
+ res = &local_res;
+ res->flags = rule->flags | IORESOURCE_AUTO;
+ res->start = -1;
+ res->end = -1;
+
+ if (!rule->map) {
+ res->flags |= IORESOURCE_DISABLED;
+ pnp_dbg(&dev->dev, " dma %d disabled\n", idx);
+ goto __add;
+ }
+
+ for (i = 0; i < 8; i++) {
+ if (rule->map & (1 << xtab[i])) {
+ res->start = res->end = xtab[i];
+ if (pnp_check_dma(dev, res))
+ goto __add;
+ }
+ }
+
+ pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx);
+ return -EBUSY;
+
+__add:
+ pnp_add_dma_resource(dev, res->start, res->flags);
+ return 0;
+}
+#endif /* CONFIG_ISA_DMA_API */
+
+void pnp_init_resources(struct pnp_dev *dev)
+{
+ pnp_free_resources(dev);
+}
+
+static void pnp_clean_resource_table(struct pnp_dev *dev)
+{
+ struct pnp_resource *pnp_res, *tmp;
+
+ list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
+ if (pnp_res->res.flags & IORESOURCE_AUTO)
+ pnp_free_resource(pnp_res);
+ }
+}
+
+/**
+ * pnp_assign_resources - assigns resources to the device based on the specified dependent number
+ * @dev: pointer to the desired device
+ * @set: the dependent function number
+ */
+static int pnp_assign_resources(struct pnp_dev *dev, int set)
+{
+ struct pnp_option *option;
+ int nport = 0, nmem = 0, nirq = 0;
+ int ndma __maybe_unused = 0;
+ int ret = 0;
+
+ pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
+ mutex_lock(&pnp_res_mutex);
+ pnp_clean_resource_table(dev);
+
+ list_for_each_entry(option, &dev->options, list) {
+ if (pnp_option_is_dependent(option) &&
+ pnp_option_set(option) != set)
+ continue;
+
+ switch (option->type) {
+ case IORESOURCE_IO:
+ ret = pnp_assign_port(dev, &option->u.port, nport++);
+ break;
+ case IORESOURCE_MEM:
+ ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
+ break;
+ case IORESOURCE_IRQ:
+ ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
+ break;
+#ifdef CONFIG_ISA_DMA_API
+ case IORESOURCE_DMA:
+ ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
+ break;
+#endif
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ if (ret < 0)
+ break;
+ }
+
+ mutex_unlock(&pnp_res_mutex);
+ if (ret < 0) {
+ pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
+ pnp_clean_resource_table(dev);
+ } else
+ dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
+ return ret;
+}
+
+/**
+ * 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)
+{
+ int i, ret;
+
+ if (!pnp_can_configure(dev)) {
+ pnp_dbg(&dev->dev, "configuration not supported\n");
+ return -ENODEV;
+ }
+
+ ret = pnp_assign_resources(dev, 0);
+ if (ret == 0)
+ return 0;
+
+ for (i = 1; i < dev->num_dependent_sets; i++) {
+ ret = pnp_assign_resources(dev, i);
+ if (ret == 0)
+ return 0;
+ }
+
+ dev_err(&dev->dev, "unable to assign resources\n");
+ return ret;
+}
+
+/**
+ * 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)) {
+ pnp_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)) {
+ pnp_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);
Code Review / kvmfornfv.git / blobdiff