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2f53432c2a
pnp_dbg() is equivalent to dev_dbg() except that we can turn it on at boot-time with the "pnp.debug" kernel parameter, so we don't have to build a new kernel image. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
407 lines
9.3 KiB
C
407 lines
9.3 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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* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.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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pnp_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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pnp_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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pnp_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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pnp_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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pnp_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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pnp_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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pnp_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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pnp_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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if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
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res->start = -1;
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res->end = -1;
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
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goto __add;
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}
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pnp_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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pnp_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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pnp_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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* @set: the dependent function number
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*/
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static int pnp_assign_resources(struct pnp_dev *dev, int set)
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{
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struct pnp_option *option;
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int nport = 0, nmem = 0, nirq = 0, ndma = 0;
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int ret = 0;
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pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
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mutex_lock(&pnp_res_mutex);
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pnp_clean_resource_table(dev);
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list_for_each_entry(option, &dev->options, list) {
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if (pnp_option_is_dependent(option) &&
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pnp_option_set(option) != set)
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continue;
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switch (option->type) {
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case IORESOURCE_IO:
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ret = pnp_assign_port(dev, &option->u.port, nport++);
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break;
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case IORESOURCE_MEM:
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ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
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break;
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case IORESOURCE_IRQ:
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ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
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break;
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case IORESOURCE_DMA:
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ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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if (ret < 0)
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break;
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}
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mutex_unlock(&pnp_res_mutex);
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if (ret < 0) {
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pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
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pnp_clean_resource_table(dev);
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} else
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dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
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return ret;
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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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int i, ret;
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if (!pnp_can_configure(dev)) {
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pnp_dbg(&dev->dev, "configuration not supported\n");
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return -ENODEV;
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}
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ret = pnp_assign_resources(dev, 0);
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if (ret == 0)
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return 0;
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for (i = 1; i < dev->num_dependent_sets; i++) {
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ret = pnp_assign_resources(dev, i);
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if (ret == 0)
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return 0;
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}
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dev_err(&dev->dev, "unable to assign resources\n");
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return ret;
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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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pnp_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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pnp_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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