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![Bjorn Helgaas](/assets/img/avatar_default.png)
This patch doesn't change any behavior; it just makes the return values more conventional. This changes pnp_assign_dma() from a void function to one that returns an int, just like the other assignment functions. For now, at least, pnp_assign_dma() always returns 0 (success), so it appears to never fail, just like before. 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>
453 lines
10 KiB
C
453 lines
10 KiB
C
/*
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* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
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*
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* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pnp.h>
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#include <linux/slab.h>
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#include <linux/bitmap.h>
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#include <linux/mutex.h>
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#include "base.h"
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DEFINE_MUTEX(pnp_res_mutex);
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static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
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{
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struct resource *res, local_res;
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res = pnp_get_resource(dev, IORESOURCE_IO, idx);
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if (res) {
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dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
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"flags %#lx\n", idx, (unsigned long long) res->start,
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(unsigned long long) res->end, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = 0;
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res->end = 0;
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if (!rule->size) {
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res->flags |= IORESOURCE_DISABLED;
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dev_dbg(&dev->dev, " io %d disabled\n", idx);
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goto __add;
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}
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res->start = rule->min;
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res->end = res->start + rule->size - 1;
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while (!pnp_check_port(dev, res)) {
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res->start += rule->align;
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res->end = res->start + rule->size - 1;
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if (res->start > rule->max || !rule->align) {
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dev_dbg(&dev->dev, " couldn't assign io %d "
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"(min %#llx max %#llx)\n", idx,
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(unsigned long long) rule->min,
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(unsigned long long) rule->max);
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return -EBUSY;
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}
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}
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__add:
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pnp_add_io_resource(dev, res->start, res->end, res->flags);
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return 0;
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}
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static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
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{
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struct resource *res, local_res;
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res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
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if (res) {
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dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
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"flags %#lx\n", idx, (unsigned long long) res->start,
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(unsigned long long) res->end, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = 0;
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res->end = 0;
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if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
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res->flags |= IORESOURCE_READONLY;
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if (rule->flags & IORESOURCE_MEM_CACHEABLE)
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res->flags |= IORESOURCE_CACHEABLE;
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if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
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res->flags |= IORESOURCE_RANGELENGTH;
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if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
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res->flags |= IORESOURCE_SHADOWABLE;
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if (!rule->size) {
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res->flags |= IORESOURCE_DISABLED;
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dev_dbg(&dev->dev, " mem %d disabled\n", idx);
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goto __add;
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}
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res->start = rule->min;
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res->end = res->start + rule->size - 1;
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while (!pnp_check_mem(dev, res)) {
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res->start += rule->align;
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res->end = res->start + rule->size - 1;
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if (res->start > rule->max || !rule->align) {
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dev_dbg(&dev->dev, " couldn't assign mem %d "
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"(min %#llx max %#llx)\n", idx,
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(unsigned long long) rule->min,
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(unsigned long long) rule->max);
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return -EBUSY;
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}
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}
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__add:
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pnp_add_mem_resource(dev, res->start, res->end, res->flags);
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return 0;
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}
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static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
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{
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struct resource *res, local_res;
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int i;
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/* IRQ priority: this table is good for i386 */
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static unsigned short xtab[16] = {
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5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
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};
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res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
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if (res) {
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dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
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idx, (int) res->start, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = -1;
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res->end = -1;
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if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
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res->flags |= IORESOURCE_DISABLED;
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dev_dbg(&dev->dev, " irq %d disabled\n", idx);
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goto __add;
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}
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/* TBD: need check for >16 IRQ */
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res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
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if (res->start < PNP_IRQ_NR) {
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res->end = res->start;
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goto __add;
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}
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for (i = 0; i < 16; i++) {
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if (test_bit(xtab[i], rule->map.bits)) {
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res->start = res->end = xtab[i];
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if (pnp_check_irq(dev, res))
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goto __add;
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}
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}
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dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
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return -EBUSY;
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__add:
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pnp_add_irq_resource(dev, res->start, res->flags);
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return 0;
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}
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static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
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{
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struct resource *res, local_res;
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int i;
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/* DMA priority: this table is good for i386 */
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static unsigned short xtab[8] = {
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1, 3, 5, 6, 7, 0, 2, 4
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};
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res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
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if (res) {
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dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
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idx, (int) res->start, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = -1;
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res->end = -1;
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for (i = 0; i < 8; i++) {
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if (rule->map & (1 << xtab[i])) {
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res->start = res->end = xtab[i];
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if (pnp_check_dma(dev, res))
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goto __add;
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}
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}
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#ifdef MAX_DMA_CHANNELS
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res->start = res->end = MAX_DMA_CHANNELS;
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#endif
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res->flags |= IORESOURCE_DISABLED;
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dev_dbg(&dev->dev, " disable dma %d\n", idx);
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__add:
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pnp_add_dma_resource(dev, res->start, res->flags);
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return 0;
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}
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void pnp_init_resources(struct pnp_dev *dev)
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{
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pnp_free_resources(dev);
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}
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static void pnp_clean_resource_table(struct pnp_dev *dev)
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{
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struct pnp_resource *pnp_res, *tmp;
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list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
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if (pnp_res->res.flags & IORESOURCE_AUTO)
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pnp_free_resource(pnp_res);
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}
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}
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/**
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* pnp_assign_resources - assigns resources to the device based on the specified dependent number
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* @dev: pointer to the desired device
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* @depnum: the dependent function number
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*
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* Only set depnum to 0 if the device does not have dependent options.
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*/
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static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
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{
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struct pnp_port *port;
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struct pnp_mem *mem;
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struct pnp_irq *irq;
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struct pnp_dma *dma;
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int nport = 0, nmem = 0, nirq = 0, ndma = 0;
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if (!pnp_can_configure(dev))
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return -ENODEV;
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dbg_pnp_show_resources(dev, "before pnp_assign_resources");
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mutex_lock(&pnp_res_mutex);
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pnp_clean_resource_table(dev);
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if (dev->independent) {
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dev_dbg(&dev->dev, "assigning independent options\n");
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port = dev->independent->port;
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mem = dev->independent->mem;
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irq = dev->independent->irq;
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dma = dev->independent->dma;
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while (port) {
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if (pnp_assign_port(dev, port, nport) < 0)
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goto fail;
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nport++;
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port = port->next;
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}
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while (mem) {
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if (pnp_assign_mem(dev, mem, nmem) < 0)
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goto fail;
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nmem++;
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mem = mem->next;
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}
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while (irq) {
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if (pnp_assign_irq(dev, irq, nirq) < 0)
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goto fail;
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nirq++;
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irq = irq->next;
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}
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while (dma) {
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if (pnp_assign_dma(dev, dma, ndma) < 0)
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goto fail;
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ndma++;
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dma = dma->next;
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}
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}
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if (depnum) {
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struct pnp_option *dep;
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int i;
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dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
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for (i = 1, dep = dev->dependent; i < depnum;
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i++, dep = dep->next)
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if (!dep)
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goto fail;
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port = dep->port;
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mem = dep->mem;
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irq = dep->irq;
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dma = dep->dma;
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while (port) {
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if (pnp_assign_port(dev, port, nport) < 0)
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goto fail;
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nport++;
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port = port->next;
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}
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while (mem) {
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if (pnp_assign_mem(dev, mem, nmem) < 0)
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goto fail;
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nmem++;
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mem = mem->next;
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}
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while (irq) {
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if (pnp_assign_irq(dev, irq, nirq) < 0)
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goto fail;
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nirq++;
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irq = irq->next;
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}
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while (dma) {
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if (pnp_assign_dma(dev, dma, ndma) < 0)
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goto fail;
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ndma++;
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dma = dma->next;
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}
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} else if (dev->dependent)
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goto fail;
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mutex_unlock(&pnp_res_mutex);
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dbg_pnp_show_resources(dev, "after pnp_assign_resources");
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return 1;
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fail:
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pnp_clean_resource_table(dev);
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mutex_unlock(&pnp_res_mutex);
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dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
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return 0;
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}
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/**
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* pnp_auto_config_dev - automatically assigns resources to a device
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* @dev: pointer to the desired device
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*/
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int pnp_auto_config_dev(struct pnp_dev *dev)
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{
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struct pnp_option *dep;
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int i = 1;
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if (!pnp_can_configure(dev)) {
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dev_dbg(&dev->dev, "configuration not supported\n");
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return -ENODEV;
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}
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if (!dev->dependent) {
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if (pnp_assign_resources(dev, 0))
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return 0;
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} else {
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dep = dev->dependent;
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do {
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if (pnp_assign_resources(dev, i))
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return 0;
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dep = dep->next;
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i++;
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} while (dep);
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}
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dev_err(&dev->dev, "unable to assign resources\n");
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return -EBUSY;
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}
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/**
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* pnp_start_dev - low-level start of the PnP device
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* @dev: pointer to the desired device
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*
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* assumes that resources have already been allocated
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*/
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int pnp_start_dev(struct pnp_dev *dev)
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{
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if (!pnp_can_write(dev)) {
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dev_dbg(&dev->dev, "activation not supported\n");
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return -EINVAL;
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}
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dbg_pnp_show_resources(dev, "pnp_start_dev");
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if (dev->protocol->set(dev) < 0) {
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dev_err(&dev->dev, "activation failed\n");
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return -EIO;
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}
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dev_info(&dev->dev, "activated\n");
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return 0;
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}
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/**
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* pnp_stop_dev - low-level disable of the PnP device
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* @dev: pointer to the desired device
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*
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* does not free resources
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*/
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int pnp_stop_dev(struct pnp_dev *dev)
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{
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if (!pnp_can_disable(dev)) {
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dev_dbg(&dev->dev, "disabling not supported\n");
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return -EINVAL;
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}
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if (dev->protocol->disable(dev) < 0) {
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dev_err(&dev->dev, "disable failed\n");
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return -EIO;
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}
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dev_info(&dev->dev, "disabled\n");
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return 0;
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}
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/**
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* pnp_activate_dev - activates a PnP device for use
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* @dev: pointer to the desired device
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*
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* does not validate or set resources so be careful.
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*/
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int pnp_activate_dev(struct pnp_dev *dev)
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{
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int error;
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if (dev->active)
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return 0;
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/* ensure resources are allocated */
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if (pnp_auto_config_dev(dev))
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return -EBUSY;
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error = pnp_start_dev(dev);
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if (error)
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return error;
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dev->active = 1;
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return 0;
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}
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/**
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* pnp_disable_dev - disables device
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* @dev: pointer to the desired device
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*
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* inform the correct pnp protocol so that resources can be used by other devices
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*/
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int pnp_disable_dev(struct pnp_dev *dev)
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{
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int error;
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if (!dev->active)
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return 0;
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error = pnp_stop_dev(dev);
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if (error)
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return error;
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dev->active = 0;
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/* release the resources so that other devices can use them */
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mutex_lock(&pnp_res_mutex);
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pnp_clean_resource_table(dev);
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mutex_unlock(&pnp_res_mutex);
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return 0;
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}
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EXPORT_SYMBOL(pnp_start_dev);
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EXPORT_SYMBOL(pnp_stop_dev);
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EXPORT_SYMBOL(pnp_activate_dev);
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EXPORT_SYMBOL(pnp_disable_dev);
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