/* * resource.c - Contains functions for registering and analyzing resource information * * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz> * Copyright 2003 Adam Belay <ambx1@neo.rr.com> */ #include <linux/module.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <asm/io.h> #include <asm/dma.h> #include <asm/irq.h> #include <linux/pci.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/pnp.h> #include "base.h" static int pnp_reserve_irq[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some IRQ */ static int pnp_reserve_dma[8] = {[0 ... 7] = -1 }; /* reserve (don't use) some DMA */ static int pnp_reserve_io[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some I/O region */ static int pnp_reserve_mem[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some memory region */ /* * option registration */ static struct pnp_option *pnp_build_option(int priority) { struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option)); if (!option) return NULL; option->priority = priority & 0xff; /* make sure the priority is valid */ if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL) option->priority = PNP_RES_PRIORITY_INVALID; return option; } struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev) { struct pnp_option *option; option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED); /* this should never happen but if it does we'll try to continue */ if (dev->independent) dev_err(&dev->dev, "independent resource already registered\n"); dev->independent = option; return option; } struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev, int priority) { struct pnp_option *option; option = pnp_build_option(priority); if (dev->dependent) { struct pnp_option *parent = dev->dependent; while (parent->next) parent = parent->next; parent->next = option; } else dev->dependent = option; return option; } int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data) { struct pnp_irq *ptr; ptr = option->irq; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = data; else option->irq = data; #ifdef CONFIG_PCI { int i; for (i = 0; i < 16; i++) if (test_bit(i, data->map)) pcibios_penalize_isa_irq(i, 0); } #endif return 0; } int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data) { struct pnp_dma *ptr; ptr = option->dma; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = data; else option->dma = data; return 0; } int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data) { struct pnp_port *ptr; ptr = option->port; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = data; else option->port = data; return 0; } int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data) { struct pnp_mem *ptr; ptr = option->mem; while (ptr && ptr->next) ptr = ptr->next; if (ptr) ptr->next = data; else option->mem = data; return 0; } static void pnp_free_port(struct pnp_port *port) { struct pnp_port *next; while (port) { next = port->next; kfree(port); port = next; } } static void pnp_free_irq(struct pnp_irq *irq) { struct pnp_irq *next; while (irq) { next = irq->next; kfree(irq); irq = next; } } static void pnp_free_dma(struct pnp_dma *dma) { struct pnp_dma *next; while (dma) { next = dma->next; kfree(dma); dma = next; } } static void pnp_free_mem(struct pnp_mem *mem) { struct pnp_mem *next; while (mem) { next = mem->next; kfree(mem); mem = next; } } void pnp_free_option(struct pnp_option *option) { struct pnp_option *next; while (option) { next = option->next; pnp_free_port(option->port); pnp_free_irq(option->irq); pnp_free_dma(option->dma); pnp_free_mem(option->mem); kfree(option); option = next; } } /* * resource validity checking */ #define length(start, end) (*(end) - *(start) + 1) /* Two ranges conflict if one doesn't end before the other starts */ #define ranged_conflict(starta, enda, startb, endb) \ !((*(enda) < *(startb)) || (*(endb) < *(starta))) #define cannot_compare(flags) \ ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED)) int pnp_check_port(struct pnp_dev *dev, int idx) { int tmp; struct pnp_dev *tdev; resource_size_t *port, *end, *tport, *tend; port = &dev->res.port_resource[idx].start; end = &dev->res.port_resource[idx].end; /* if the resource doesn't exist, don't complain about it */ if (cannot_compare(dev->res.port_resource[idx].flags)) return 1; /* check if the resource is already in use, skip if the * device is active because it itself may be in use */ if (!dev->active) { if (__check_region(&ioport_resource, *port, length(port, end))) return 0; } /* check if the resource is reserved */ for (tmp = 0; tmp < 8; tmp++) { int rport = pnp_reserve_io[tmp << 1]; int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1; if (ranged_conflict(port, end, &rport, &rend)) return 0; } /* check for internal conflicts */ for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) { if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) { tport = &dev->res.port_resource[tmp].start; tend = &dev->res.port_resource[tmp].end; if (ranged_conflict(port, end, tport, tend)) return 0; } } /* check for conflicts with other pnp devices */ pnp_for_each_dev(tdev) { if (tdev == dev) continue; for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) { if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) { if (cannot_compare (tdev->res.port_resource[tmp].flags)) continue; tport = &tdev->res.port_resource[tmp].start; tend = &tdev->res.port_resource[tmp].end; if (ranged_conflict(port, end, tport, tend)) return 0; } } } return 1; } int pnp_check_mem(struct pnp_dev *dev, int idx) { int tmp; struct pnp_dev *tdev; resource_size_t *addr, *end, *taddr, *tend; addr = &dev->res.mem_resource[idx].start; end = &dev->res.mem_resource[idx].end; /* if the resource doesn't exist, don't complain about it */ if (cannot_compare(dev->res.mem_resource[idx].flags)) return 1; /* check if the resource is already in use, skip if the * device is active because it itself may be in use */ if (!dev->active) { if (check_mem_region(*addr, length(addr, end))) return 0; } /* check if the resource is reserved */ for (tmp = 0; tmp < 8; tmp++) { int raddr = pnp_reserve_mem[tmp << 1]; int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1; if (ranged_conflict(addr, end, &raddr, &rend)) return 0; } /* check for internal conflicts */ for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) { if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { taddr = &dev->res.mem_resource[tmp].start; tend = &dev->res.mem_resource[tmp].end; if (ranged_conflict(addr, end, taddr, tend)) return 0; } } /* check for conflicts with other pnp devices */ pnp_for_each_dev(tdev) { if (tdev == dev) continue; for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) { if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { if (cannot_compare (tdev->res.mem_resource[tmp].flags)) continue; taddr = &tdev->res.mem_resource[tmp].start; tend = &tdev->res.mem_resource[tmp].end; if (ranged_conflict(addr, end, taddr, tend)) return 0; } } } return 1; } static irqreturn_t pnp_test_handler(int irq, void *dev_id) { return IRQ_HANDLED; } int pnp_check_irq(struct pnp_dev *dev, int idx) { int tmp; struct pnp_dev *tdev; resource_size_t *irq = &dev->res.irq_resource[idx].start; /* if the resource doesn't exist, don't complain about it */ if (cannot_compare(dev->res.irq_resource[idx].flags)) return 1; /* check if the resource is valid */ if (*irq < 0 || *irq > 15) return 0; /* check if the resource is reserved */ for (tmp = 0; tmp < 16; tmp++) { if (pnp_reserve_irq[tmp] == *irq) return 0; } /* check for internal conflicts */ for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) { if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { if (dev->res.irq_resource[tmp].start == *irq) return 0; } } #ifdef CONFIG_PCI /* check if the resource is being used by a pci device */ { struct pci_dev *pci = NULL; for_each_pci_dev(pci) { if (pci->irq == *irq) { pci_dev_put(pci); return 0; } } } #endif /* check if the resource is already in use, skip if the * device is active because it itself may be in use */ if (!dev->active) { if (request_irq(*irq, pnp_test_handler, IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL)) return 0; free_irq(*irq, NULL); } /* check for conflicts with other pnp devices */ pnp_for_each_dev(tdev) { if (tdev == dev) continue; for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) { if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { if (cannot_compare (tdev->res.irq_resource[tmp].flags)) continue; if ((tdev->res.irq_resource[tmp].start == *irq)) return 0; } } } return 1; } int pnp_check_dma(struct pnp_dev *dev, int idx) { #ifndef CONFIG_IA64 int tmp; struct pnp_dev *tdev; resource_size_t *dma = &dev->res.dma_resource[idx].start; /* if the resource doesn't exist, don't complain about it */ if (cannot_compare(dev->res.dma_resource[idx].flags)) return 1; /* check if the resource is valid */ if (*dma < 0 || *dma == 4 || *dma > 7) return 0; /* check if the resource is reserved */ for (tmp = 0; tmp < 8; tmp++) { if (pnp_reserve_dma[tmp] == *dma) return 0; } /* check for internal conflicts */ for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) { if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { if (dev->res.dma_resource[tmp].start == *dma) return 0; } } /* check if the resource is already in use, skip if the * device is active because it itself may be in use */ if (!dev->active) { if (request_dma(*dma, "pnp")) return 0; free_dma(*dma); } /* check for conflicts with other pnp devices */ pnp_for_each_dev(tdev) { if (tdev == dev) continue; for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) { if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { if (cannot_compare (tdev->res.dma_resource[tmp].flags)) continue; if ((tdev->res.dma_resource[tmp].start == *dma)) return 0; } } } return 1; #else /* IA64 does not have legacy DMA */ return 0; #endif } /* 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);