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430 lines
9.8 KiB
430 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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* Copyright 2003 Adam Belay <[email protected]> |
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* Copyright (C) 2008 Hewlett-Packard Development Company, L.P. |
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* Bjorn Helgaas <[email protected]> |
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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/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 struct resource *pnp_find_resource(struct pnp_dev *dev, |
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unsigned char rule, |
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unsigned long type, |
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unsigned int bar) |
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{ |
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struct resource *res = pnp_get_resource(dev, type, bar); |
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/* when the resource already exists, set its resource bits from rule */ |
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if (res) { |
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res->flags &= ~IORESOURCE_BITS; |
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res->flags |= rule & IORESOURCE_BITS; |
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} |
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return res; |
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} |
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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_find_resource(dev, rule->flags, 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_find_resource(dev, rule->flags, 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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/* ??? rule->flags restricted to 8 bits, all tests bogus ??? */ |
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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_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_find_resource(dev, rule->flags, 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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#ifdef CONFIG_ISA_DMA_API |
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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_find_resource(dev, rule->flags, 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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if (!rule->map) { |
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res->flags |= IORESOURCE_DISABLED; |
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pnp_dbg(&dev->dev, " dma %d disabled\n", idx); |
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goto __add; |
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} |
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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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pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx); |
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return -EBUSY; |
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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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#endif /* CONFIG_ISA_DMA_API */ |
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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; |
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int ndma __maybe_unused = 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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#ifdef CONFIG_ISA_DMA_API |
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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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#endif |
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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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