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754 lines
17 KiB
754 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[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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|
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#include <linux/module.h> |
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#include <linux/slab.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(struct pnp_dev *dev, unsigned long type, |
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unsigned int option_flags) |
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{ |
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struct pnp_option *option; |
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option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL); |
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if (!option) |
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return NULL; |
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option->flags = option_flags; |
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option->type = type; |
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list_add_tail(&option->list, &dev->options); |
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return option; |
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} |
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int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags, |
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pnp_irq_mask_t *map, unsigned char flags) |
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{ |
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struct pnp_option *option; |
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struct pnp_irq *irq; |
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option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags); |
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if (!option) |
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return -ENOMEM; |
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irq = &option->u.irq; |
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irq->map = *map; |
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irq->flags = flags; |
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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, irq->map.bits)) |
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pcibios_penalize_isa_irq(i, 0); |
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} |
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#endif |
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dbg_pnp_show_option(dev, option); |
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return 0; |
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} |
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int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags, |
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unsigned char map, unsigned char flags) |
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{ |
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struct pnp_option *option; |
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struct pnp_dma *dma; |
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option = pnp_build_option(dev, IORESOURCE_DMA, option_flags); |
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if (!option) |
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return -ENOMEM; |
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dma = &option->u.dma; |
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dma->map = map; |
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dma->flags = flags; |
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dbg_pnp_show_option(dev, option); |
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return 0; |
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} |
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int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags, |
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resource_size_t min, resource_size_t max, |
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resource_size_t align, resource_size_t size, |
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unsigned char flags) |
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{ |
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struct pnp_option *option; |
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struct pnp_port *port; |
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option = pnp_build_option(dev, IORESOURCE_IO, option_flags); |
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if (!option) |
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return -ENOMEM; |
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port = &option->u.port; |
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port->min = min; |
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port->max = max; |
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port->align = align; |
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port->size = size; |
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port->flags = flags; |
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dbg_pnp_show_option(dev, option); |
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return 0; |
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} |
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int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags, |
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resource_size_t min, resource_size_t max, |
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resource_size_t align, resource_size_t size, |
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unsigned char flags) |
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{ |
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struct pnp_option *option; |
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struct pnp_mem *mem; |
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option = pnp_build_option(dev, IORESOURCE_MEM, option_flags); |
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if (!option) |
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return -ENOMEM; |
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mem = &option->u.mem; |
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mem->min = min; |
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mem->max = max; |
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mem->align = align; |
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mem->size = size; |
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mem->flags = flags; |
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dbg_pnp_show_option(dev, option); |
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return 0; |
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} |
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void pnp_free_options(struct pnp_dev *dev) |
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{ |
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struct pnp_option *option, *tmp; |
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list_for_each_entry_safe(option, tmp, &dev->options, list) { |
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list_del(&option->list); |
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kfree(option); |
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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_DISABLED) |
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int pnp_check_port(struct pnp_dev *dev, struct resource *res) |
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{ |
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int i; |
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struct pnp_dev *tdev; |
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struct resource *tres; |
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resource_size_t *port, *end, *tport, *tend; |
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port = &res->start; |
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end = &res->end; |
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/* if the resource doesn't exist, don't complain about it */ |
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if (cannot_compare(res->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 (!request_region(*port, length(port, end), "pnp")) |
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return 0; |
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release_region(*port, length(port, end)); |
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} |
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/* check if the resource is reserved */ |
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for (i = 0; i < 8; i++) { |
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int rport = pnp_reserve_io[i << 1]; |
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int rend = pnp_reserve_io[(i << 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 (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { |
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if (tres != res && tres->flags & IORESOURCE_IO) { |
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tport = &tres->start; |
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tend = &tres->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 (i = 0; |
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(tres = pnp_get_resource(tdev, IORESOURCE_IO, i)); |
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i++) { |
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if (tres->flags & IORESOURCE_IO) { |
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if (cannot_compare(tres->flags)) |
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continue; |
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if (tres->flags & IORESOURCE_WINDOW) |
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continue; |
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tport = &tres->start; |
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tend = &tres->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, struct resource *res) |
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{ |
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int i; |
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struct pnp_dev *tdev; |
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struct resource *tres; |
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resource_size_t *addr, *end, *taddr, *tend; |
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addr = &res->start; |
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end = &res->end; |
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/* if the resource doesn't exist, don't complain about it */ |
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if (cannot_compare(res->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 (!request_mem_region(*addr, length(addr, end), "pnp")) |
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return 0; |
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release_mem_region(*addr, length(addr, end)); |
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} |
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/* check if the resource is reserved */ |
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for (i = 0; i < 8; i++) { |
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int raddr = pnp_reserve_mem[i << 1]; |
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int rend = pnp_reserve_mem[(i << 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 (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { |
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if (tres != res && tres->flags & IORESOURCE_MEM) { |
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taddr = &tres->start; |
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tend = &tres->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 (i = 0; |
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(tres = pnp_get_resource(tdev, IORESOURCE_MEM, i)); |
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i++) { |
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if (tres->flags & IORESOURCE_MEM) { |
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if (cannot_compare(tres->flags)) |
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continue; |
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if (tres->flags & IORESOURCE_WINDOW) |
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continue; |
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taddr = &tres->start; |
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tend = &tres->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) |
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{ |
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return IRQ_HANDLED; |
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} |
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#ifdef CONFIG_PCI |
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static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci, |
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unsigned int irq) |
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{ |
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u32 class; |
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u8 progif; |
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if (pci->irq == irq) { |
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pnp_dbg(&pnp->dev, " device %s using irq %d\n", |
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pci_name(pci), irq); |
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return 1; |
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} |
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/* |
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* See pci_setup_device() and ata_pci_sff_activate_host() for |
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* similar IDE legacy detection. |
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*/ |
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pci_read_config_dword(pci, PCI_CLASS_REVISION, &class); |
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class >>= 8; /* discard revision ID */ |
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progif = class & 0xff; |
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class >>= 8; |
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if (class == PCI_CLASS_STORAGE_IDE) { |
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/* |
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* Unless both channels are native-PCI mode only, |
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* treat the compatibility IRQs as busy. |
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*/ |
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if ((progif & 0x5) != 0x5) |
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if (pci_get_legacy_ide_irq(pci, 0) == irq || |
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pci_get_legacy_ide_irq(pci, 1) == irq) { |
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pnp_dbg(&pnp->dev, " legacy IDE device %s " |
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"using irq %d\n", pci_name(pci), irq); |
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return 1; |
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} |
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} |
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return 0; |
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} |
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#endif |
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static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq) |
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{ |
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#ifdef CONFIG_PCI |
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struct pci_dev *pci = NULL; |
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for_each_pci_dev(pci) { |
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if (pci_dev_uses_irq(pnp, pci, irq)) { |
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pci_dev_put(pci); |
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return 1; |
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} |
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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_check_irq(struct pnp_dev *dev, struct resource *res) |
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{ |
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int i; |
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struct pnp_dev *tdev; |
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struct resource *tres; |
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resource_size_t *irq; |
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irq = &res->start; |
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/* if the resource doesn't exist, don't complain about it */ |
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if (cannot_compare(res->flags)) |
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return 1; |
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/* check if the resource is valid */ |
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if (*irq > 15) |
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return 0; |
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/* check if the resource is reserved */ |
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for (i = 0; i < 16; i++) { |
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if (pnp_reserve_irq[i] == *irq) |
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return 0; |
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} |
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/* check for internal conflicts */ |
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) { |
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if (tres != res && tres->flags & IORESOURCE_IRQ) { |
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if (tres->start == *irq) |
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return 0; |
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} |
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} |
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/* check if the resource is being used by a pci device */ |
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if (pci_uses_irq(dev, *irq)) |
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return 0; |
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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, |
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IRQF_PROBE_SHARED, "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 (i = 0; |
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(tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i)); |
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i++) { |
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if (tres->flags & IORESOURCE_IRQ) { |
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if (cannot_compare(tres->flags)) |
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continue; |
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if (tres->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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#ifdef CONFIG_ISA_DMA_API |
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int pnp_check_dma(struct pnp_dev *dev, struct resource *res) |
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{ |
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int i; |
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struct pnp_dev *tdev; |
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struct resource *tres; |
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resource_size_t *dma; |
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dma = &res->start; |
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/* if the resource doesn't exist, don't complain about it */ |
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if (cannot_compare(res->flags)) |
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return 1; |
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/* check if the resource is valid */ |
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if (*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 (i = 0; i < 8; i++) { |
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if (pnp_reserve_dma[i] == *dma) |
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return 0; |
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} |
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/* check for internal conflicts */ |
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) { |
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if (tres != res && tres->flags & IORESOURCE_DMA) { |
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if (tres->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 (i = 0; |
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(tres = pnp_get_resource(tdev, IORESOURCE_DMA, i)); |
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i++) { |
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if (tres->flags & IORESOURCE_DMA) { |
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if (cannot_compare(tres->flags)) |
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continue; |
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if (tres->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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} |
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#endif /* CONFIG_ISA_DMA_API */ |
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unsigned long pnp_resource_type(struct resource *res) |
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{ |
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return res->flags & (IORESOURCE_IO | IORESOURCE_MEM | |
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IORESOURCE_IRQ | IORESOURCE_DMA | |
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IORESOURCE_BUS); |
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} |
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struct resource *pnp_get_resource(struct pnp_dev *dev, |
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unsigned long type, unsigned int num) |
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{ |
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struct pnp_resource *pnp_res; |
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struct resource *res; |
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list_for_each_entry(pnp_res, &dev->resources, list) { |
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res = &pnp_res->res; |
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if (pnp_resource_type(res) == type && num-- == 0) |
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return res; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL(pnp_get_resource); |
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static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev) |
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{ |
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struct pnp_resource *pnp_res; |
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pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL); |
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if (!pnp_res) |
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return NULL; |
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list_add_tail(&pnp_res->list, &dev->resources); |
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return pnp_res; |
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} |
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struct pnp_resource *pnp_add_resource(struct pnp_dev *dev, |
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struct resource *res) |
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{ |
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struct pnp_resource *pnp_res; |
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pnp_res = pnp_new_resource(dev); |
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if (!pnp_res) { |
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dev_err(&dev->dev, "can't add resource %pR\n", res); |
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return NULL; |
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} |
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pnp_res->res = *res; |
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pnp_res->res.name = dev->name; |
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dev_dbg(&dev->dev, "%pR\n", res); |
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return pnp_res; |
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} |
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struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq, |
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int flags) |
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{ |
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struct pnp_resource *pnp_res; |
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struct resource *res; |
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pnp_res = pnp_new_resource(dev); |
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if (!pnp_res) { |
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dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq); |
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return NULL; |
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} |
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res = &pnp_res->res; |
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res->flags = IORESOURCE_IRQ | flags; |
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res->start = irq; |
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res->end = irq; |
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dev_dbg(&dev->dev, "%pR\n", res); |
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return pnp_res; |
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} |
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struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma, |
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int flags) |
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{ |
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struct pnp_resource *pnp_res; |
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struct resource *res; |
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pnp_res = pnp_new_resource(dev); |
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if (!pnp_res) { |
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dev_err(&dev->dev, "can't add resource for DMA %d\n", dma); |
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return NULL; |
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} |
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res = &pnp_res->res; |
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res->flags = IORESOURCE_DMA | flags; |
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res->start = dma; |
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res->end = dma; |
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dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); |
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return pnp_res; |
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} |
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struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev, |
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resource_size_t start, |
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resource_size_t end, int flags) |
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{ |
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struct pnp_resource *pnp_res; |
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struct resource *res; |
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pnp_res = pnp_new_resource(dev); |
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if (!pnp_res) { |
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dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n", |
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(unsigned long long) start, |
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(unsigned long long) end); |
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return NULL; |
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} |
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res = &pnp_res->res; |
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res->flags = IORESOURCE_IO | flags; |
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res->start = start; |
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res->end = end; |
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dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); |
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return pnp_res; |
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} |
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struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev, |
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resource_size_t start, |
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resource_size_t end, int flags) |
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{ |
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struct pnp_resource *pnp_res; |
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struct resource *res; |
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pnp_res = pnp_new_resource(dev); |
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if (!pnp_res) { |
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dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n", |
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(unsigned long long) start, |
|
(unsigned long long) end); |
|
return NULL; |
|
} |
|
|
|
res = &pnp_res->res; |
|
res->flags = IORESOURCE_MEM | flags; |
|
res->start = start; |
|
res->end = end; |
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); |
|
return pnp_res; |
|
} |
|
|
|
struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev, |
|
resource_size_t start, |
|
resource_size_t end) |
|
{ |
|
struct pnp_resource *pnp_res; |
|
struct resource *res; |
|
|
|
pnp_res = pnp_new_resource(dev); |
|
if (!pnp_res) { |
|
dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n", |
|
(unsigned long long) start, |
|
(unsigned long long) end); |
|
return NULL; |
|
} |
|
|
|
res = &pnp_res->res; |
|
res->flags = IORESOURCE_BUS; |
|
res->start = start; |
|
res->end = end; |
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); |
|
return pnp_res; |
|
} |
|
|
|
/* |
|
* Determine whether the specified resource is a possible configuration |
|
* for this device. |
|
*/ |
|
int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start, |
|
resource_size_t size) |
|
{ |
|
struct pnp_option *option; |
|
struct pnp_port *port; |
|
struct pnp_mem *mem; |
|
struct pnp_irq *irq; |
|
struct pnp_dma *dma; |
|
|
|
list_for_each_entry(option, &dev->options, list) { |
|
if (option->type != type) |
|
continue; |
|
|
|
switch (option->type) { |
|
case IORESOURCE_IO: |
|
port = &option->u.port; |
|
if (port->min == start && port->size == size) |
|
return 1; |
|
break; |
|
case IORESOURCE_MEM: |
|
mem = &option->u.mem; |
|
if (mem->min == start && mem->size == size) |
|
return 1; |
|
break; |
|
case IORESOURCE_IRQ: |
|
irq = &option->u.irq; |
|
if (start < PNP_IRQ_NR && |
|
test_bit(start, irq->map.bits)) |
|
return 1; |
|
break; |
|
case IORESOURCE_DMA: |
|
dma = &option->u.dma; |
|
if (dma->map & (1 << start)) |
|
return 1; |
|
break; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(pnp_possible_config); |
|
|
|
int pnp_range_reserved(resource_size_t start, resource_size_t end) |
|
{ |
|
struct pnp_dev *dev; |
|
struct pnp_resource *pnp_res; |
|
resource_size_t *dev_start, *dev_end; |
|
|
|
pnp_for_each_dev(dev) { |
|
list_for_each_entry(pnp_res, &dev->resources, list) { |
|
dev_start = &pnp_res->res.start; |
|
dev_end = &pnp_res->res.end; |
|
if (ranged_conflict(&start, &end, dev_start, dev_end)) |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(pnp_range_reserved); |
|
|
|
/* format is: pnp_reserve_irq=irq1[,irq2] .... */ |
|
static int __init pnp_setup_reserve_irq(char *str) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < 16; i++) |
|
if (get_option(&str, &pnp_reserve_irq[i]) != 2) |
|
break; |
|
return 1; |
|
} |
|
|
|
__setup("pnp_reserve_irq=", pnp_setup_reserve_irq); |
|
|
|
/* format is: pnp_reserve_dma=dma1[,dma2] .... */ |
|
static int __init pnp_setup_reserve_dma(char *str) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < 8; i++) |
|
if (get_option(&str, &pnp_reserve_dma[i]) != 2) |
|
break; |
|
return 1; |
|
} |
|
|
|
__setup("pnp_reserve_dma=", pnp_setup_reserve_dma); |
|
|
|
/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */ |
|
static int __init pnp_setup_reserve_io(char *str) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < 16; i++) |
|
if (get_option(&str, &pnp_reserve_io[i]) != 2) |
|
break; |
|
return 1; |
|
} |
|
|
|
__setup("pnp_reserve_io=", pnp_setup_reserve_io); |
|
|
|
/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */ |
|
static int __init pnp_setup_reserve_mem(char *str) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < 16; i++) |
|
if (get_option(&str, &pnp_reserve_mem[i]) != 2) |
|
break; |
|
return 1; |
|
} |
|
|
|
__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
|
|
|