1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
543 lines
12 KiB
C
543 lines
12 KiB
C
/*
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* resource.c - Contains functions for registering and analyzing resource information
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*
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* based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/pnp.h>
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#include "base.h"
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static int pnp_reserve_irq[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some IRQ */
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static int pnp_reserve_dma[8] = { [0 ... 7] = -1 }; /* reserve (don't use) some DMA */
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static int pnp_reserve_io[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some I/O region */
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static int pnp_reserve_mem[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some memory region */
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/*
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* option registration
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*/
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static struct pnp_option * pnp_build_option(int priority)
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{
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struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
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/* check if pnp_alloc ran out of memory */
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if (!option)
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return NULL;
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option->priority = priority & 0xff;
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/* make sure the priority is valid */
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if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
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option->priority = PNP_RES_PRIORITY_INVALID;
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return option;
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}
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struct pnp_option * pnp_register_independent_option(struct pnp_dev *dev)
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{
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struct pnp_option *option;
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if (!dev)
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return NULL;
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option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
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/* this should never happen but if it does we'll try to continue */
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if (dev->independent)
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pnp_err("independent resource already registered");
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dev->independent = option;
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return option;
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}
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struct pnp_option * pnp_register_dependent_option(struct pnp_dev *dev, int priority)
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{
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struct pnp_option *option;
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if (!dev)
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return NULL;
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option = pnp_build_option(priority);
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if (dev->dependent) {
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struct pnp_option *parent = dev->dependent;
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while (parent->next)
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parent = parent->next;
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parent->next = option;
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} else
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dev->dependent = option;
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return option;
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}
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int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
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{
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struct pnp_irq *ptr;
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if (!option)
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return -EINVAL;
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if (!data)
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return -EINVAL;
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ptr = option->irq;
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while (ptr && ptr->next)
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ptr = ptr->next;
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if (ptr)
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ptr->next = data;
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else
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option->irq = data;
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#ifdef CONFIG_PCI
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{
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int i;
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for (i = 0; i < 16; i++)
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if (test_bit(i, data->map))
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pcibios_penalize_isa_irq(i);
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}
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#endif
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return 0;
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}
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int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data)
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{
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struct pnp_dma *ptr;
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if (!option)
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return -EINVAL;
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if (!data)
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return -EINVAL;
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ptr = option->dma;
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while (ptr && ptr->next)
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ptr = ptr->next;
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if (ptr)
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ptr->next = data;
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else
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option->dma = data;
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return 0;
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}
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int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
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{
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struct pnp_port *ptr;
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if (!option)
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return -EINVAL;
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if (!data)
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return -EINVAL;
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ptr = option->port;
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while (ptr && ptr->next)
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ptr = ptr->next;
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if (ptr)
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ptr->next = data;
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else
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option->port = data;
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return 0;
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}
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int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
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{
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struct pnp_mem *ptr;
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if (!option)
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return -EINVAL;
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if (!data)
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return -EINVAL;
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ptr = option->mem;
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while (ptr && ptr->next)
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ptr = ptr->next;
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if (ptr)
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ptr->next = data;
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else
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option->mem = data;
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return 0;
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}
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static void pnp_free_port(struct pnp_port *port)
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{
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struct pnp_port *next;
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while (port) {
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next = port->next;
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kfree(port);
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port = next;
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}
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}
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static void pnp_free_irq(struct pnp_irq *irq)
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{
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struct pnp_irq *next;
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while (irq) {
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next = irq->next;
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kfree(irq);
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irq = next;
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}
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}
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static void pnp_free_dma(struct pnp_dma *dma)
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{
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struct pnp_dma *next;
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while (dma) {
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next = dma->next;
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kfree(dma);
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dma = next;
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}
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}
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static void pnp_free_mem(struct pnp_mem *mem)
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{
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struct pnp_mem *next;
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while (mem) {
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next = mem->next;
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kfree(mem);
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mem = next;
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}
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}
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void pnp_free_option(struct pnp_option *option)
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{
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struct pnp_option *next;
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while (option) {
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next = option->next;
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pnp_free_port(option->port);
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pnp_free_irq(option->irq);
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pnp_free_dma(option->dma);
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pnp_free_mem(option->mem);
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kfree(option);
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option = next;
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}
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}
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/*
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* resource validity checking
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*/
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#define length(start, end) (*(end) - *(start) + 1)
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/* Two ranges conflict if one doesn't end before the other starts */
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#define ranged_conflict(starta, enda, startb, endb) \
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!((*(enda) < *(startb)) || (*(endb) < *(starta)))
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#define cannot_compare(flags) \
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((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
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int pnp_check_port(struct pnp_dev * dev, int idx)
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{
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int tmp;
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struct pnp_dev *tdev;
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unsigned long *port, *end, *tport, *tend;
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port = &dev->res.port_resource[idx].start;
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end = &dev->res.port_resource[idx].end;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(dev->res.port_resource[idx].flags))
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return 1;
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if(!dev->active) {
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if (__check_region(&ioport_resource, *port, length(port,end)))
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return 0;
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}
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/* check if the resource is reserved */
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for (tmp = 0; tmp < 8; tmp++) {
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int rport = pnp_reserve_io[tmp << 1];
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int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
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if (ranged_conflict(port,end,&rport,&rend))
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return 0;
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}
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/* check for internal conflicts */
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for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
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if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
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tport = &dev->res.port_resource[tmp].start;
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tend = &dev->res.port_resource[tmp].end;
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if (ranged_conflict(port,end,tport,tend))
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return 0;
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}
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
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if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
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if (cannot_compare(tdev->res.port_resource[tmp].flags))
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continue;
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tport = &tdev->res.port_resource[tmp].start;
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tend = &tdev->res.port_resource[tmp].end;
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if (ranged_conflict(port,end,tport,tend))
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return 0;
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}
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}
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}
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return 1;
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}
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int pnp_check_mem(struct pnp_dev * dev, int idx)
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{
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int tmp;
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struct pnp_dev *tdev;
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unsigned long *addr, *end, *taddr, *tend;
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addr = &dev->res.mem_resource[idx].start;
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end = &dev->res.mem_resource[idx].end;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(dev->res.mem_resource[idx].flags))
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return 1;
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if(!dev->active) {
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if (check_mem_region(*addr, length(addr,end)))
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return 0;
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}
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/* check if the resource is reserved */
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for (tmp = 0; tmp < 8; tmp++) {
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int raddr = pnp_reserve_mem[tmp << 1];
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int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
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if (ranged_conflict(addr,end,&raddr,&rend))
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return 0;
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}
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/* check for internal conflicts */
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for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
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if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
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taddr = &dev->res.mem_resource[tmp].start;
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tend = &dev->res.mem_resource[tmp].end;
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if (ranged_conflict(addr,end,taddr,tend))
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return 0;
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}
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
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if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
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if (cannot_compare(tdev->res.mem_resource[tmp].flags))
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continue;
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taddr = &tdev->res.mem_resource[tmp].start;
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tend = &tdev->res.mem_resource[tmp].end;
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if (ranged_conflict(addr,end,taddr,tend))
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return 0;
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}
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}
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}
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return 1;
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}
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static irqreturn_t pnp_test_handler(int irq, void *dev_id, struct pt_regs *regs)
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{
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return IRQ_HANDLED;
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}
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int pnp_check_irq(struct pnp_dev * dev, int idx)
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{
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int tmp;
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struct pnp_dev *tdev;
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unsigned long * irq = &dev->res.irq_resource[idx].start;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(dev->res.irq_resource[idx].flags))
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return 1;
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/* check if the resource is valid */
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if (*irq < 0 || *irq > 15)
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return 0;
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/* check if the resource is reserved */
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for (tmp = 0; tmp < 16; tmp++) {
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if (pnp_reserve_irq[tmp] == *irq)
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return 0;
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}
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/* check for internal conflicts */
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for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
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if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
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if (dev->res.irq_resource[tmp].start == *irq)
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return 0;
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}
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}
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#ifdef CONFIG_PCI
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/* check if the resource is being used by a pci device */
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{
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struct pci_dev *pci = NULL;
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for_each_pci_dev(pci) {
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if (pci->irq == *irq)
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return 0;
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}
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}
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#endif
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if(!dev->active) {
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if (request_irq(*irq, pnp_test_handler, SA_INTERRUPT, "pnp", NULL))
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return 0;
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free_irq(*irq, NULL);
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
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if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
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if (cannot_compare(tdev->res.irq_resource[tmp].flags))
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continue;
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if ((tdev->res.irq_resource[tmp].start == *irq))
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return 0;
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}
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}
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}
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return 1;
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}
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int pnp_check_dma(struct pnp_dev * dev, int idx)
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{
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#ifndef CONFIG_IA64
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int tmp;
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struct pnp_dev *tdev;
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unsigned long * dma = &dev->res.dma_resource[idx].start;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(dev->res.dma_resource[idx].flags))
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return 1;
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/* check if the resource is valid */
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if (*dma < 0 || *dma == 4 || *dma > 7)
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return 0;
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/* check if the resource is reserved */
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for (tmp = 0; tmp < 8; tmp++) {
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if (pnp_reserve_dma[tmp] == *dma)
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return 0;
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}
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/* check for internal conflicts */
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for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
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if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
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if (dev->res.dma_resource[tmp].start == *dma)
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return 0;
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}
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}
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if(!dev->active) {
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if (request_dma(*dma, "pnp"))
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return 0;
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free_dma(*dma);
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
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if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
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if (cannot_compare(tdev->res.dma_resource[tmp].flags))
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continue;
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if ((tdev->res.dma_resource[tmp].start == *dma))
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return 0;
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}
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}
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}
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return 1;
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#else
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/* IA64 hasn't legacy DMA */
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return 0;
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#endif
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}
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EXPORT_SYMBOL(pnp_register_dependent_option);
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EXPORT_SYMBOL(pnp_register_independent_option);
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EXPORT_SYMBOL(pnp_register_irq_resource);
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EXPORT_SYMBOL(pnp_register_dma_resource);
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EXPORT_SYMBOL(pnp_register_port_resource);
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EXPORT_SYMBOL(pnp_register_mem_resource);
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/* format is: pnp_reserve_irq=irq1[,irq2] .... */
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static int __init pnp_setup_reserve_irq(char *str)
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{
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int i;
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for (i = 0; i < 16; i++)
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if (get_option(&str,&pnp_reserve_irq[i]) != 2)
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break;
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return 1;
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}
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__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
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/* format is: pnp_reserve_dma=dma1[,dma2] .... */
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static int __init pnp_setup_reserve_dma(char *str)
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{
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int i;
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for (i = 0; i < 8; i++)
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if (get_option(&str,&pnp_reserve_dma[i]) != 2)
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break;
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return 1;
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}
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__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
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/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
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static int __init pnp_setup_reserve_io(char *str)
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{
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int i;
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for (i = 0; i < 16; i++)
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if (get_option(&str,&pnp_reserve_io[i]) != 2)
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break;
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return 1;
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}
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__setup("pnp_reserve_io=", pnp_setup_reserve_io);
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/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
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static int __init pnp_setup_reserve_mem(char *str)
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{
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int i;
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for (i = 0; i < 16; i++)
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if (get_option(&str,&pnp_reserve_mem[i]) != 2)
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break;
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return 1;
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}
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__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
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