diff options
Diffstat (limited to 'drivers/pnp/resource.c')
| -rw-r--r-- | drivers/pnp/resource.c | 754 |
1 files changed, 754 insertions, 0 deletions
diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c new file mode 100644 index 000000000..70d4ba957 --- /dev/null +++ b/drivers/pnp/resource.c @@ -0,0 +1,754 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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> + * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. + * Bjorn Helgaas <bjorn.helgaas@hp.com> + */ + +#include <linux/module.h> +#include <linux/slab.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(struct pnp_dev *dev, unsigned long type, + unsigned int option_flags) +{ + struct pnp_option *option; + + option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL); + if (!option) + return NULL; + + option->flags = option_flags; + option->type = type; + + list_add_tail(&option->list, &dev->options); + return option; +} + +int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags, + pnp_irq_mask_t *map, unsigned char flags) +{ + struct pnp_option *option; + struct pnp_irq *irq; + + option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags); + if (!option) + return -ENOMEM; + + irq = &option->u.irq; + irq->map = *map; + irq->flags = flags; + +#ifdef CONFIG_PCI + { + int i; + + for (i = 0; i < 16; i++) + if (test_bit(i, irq->map.bits)) + pcibios_penalize_isa_irq(i, 0); + } +#endif + + dbg_pnp_show_option(dev, option); + return 0; +} + +int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags, + unsigned char map, unsigned char flags) +{ + struct pnp_option *option; + struct pnp_dma *dma; + + option = pnp_build_option(dev, IORESOURCE_DMA, option_flags); + if (!option) + return -ENOMEM; + + dma = &option->u.dma; + dma->map = map; + dma->flags = flags; + + dbg_pnp_show_option(dev, option); + return 0; +} + +int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags, + resource_size_t min, resource_size_t max, + resource_size_t align, resource_size_t size, + unsigned char flags) +{ + struct pnp_option *option; + struct pnp_port *port; + + option = pnp_build_option(dev, IORESOURCE_IO, option_flags); + if (!option) + return -ENOMEM; + + port = &option->u.port; + port->min = min; + port->max = max; + port->align = align; + port->size = size; + port->flags = flags; + + dbg_pnp_show_option(dev, option); + return 0; +} + +int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags, + resource_size_t min, resource_size_t max, + resource_size_t align, resource_size_t size, + unsigned char flags) +{ + struct pnp_option *option; + struct pnp_mem *mem; + + option = pnp_build_option(dev, IORESOURCE_MEM, option_flags); + if (!option) + return -ENOMEM; + + mem = &option->u.mem; + mem->min = min; + mem->max = max; + mem->align = align; + mem->size = size; + mem->flags = flags; + + dbg_pnp_show_option(dev, option); + return 0; +} + +void pnp_free_options(struct pnp_dev *dev) +{ + struct pnp_option *option, *tmp; + + list_for_each_entry_safe(option, tmp, &dev->options, list) { + list_del(&option->list); + kfree(option); + } +} + +/* + * 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_DISABLED) + +int pnp_check_port(struct pnp_dev *dev, struct resource *res) +{ + int i; + struct pnp_dev *tdev; + struct resource *tres; + resource_size_t *port, *end, *tport, *tend; + + port = &res->start; + end = &res->end; + + /* if the resource doesn't exist, don't complain about it */ + if (cannot_compare(res->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 (!request_region(*port, length(port, end), "pnp")) + return 0; + release_region(*port, length(port, end)); + } + + /* check if the resource is reserved */ + for (i = 0; i < 8; i++) { + int rport = pnp_reserve_io[i << 1]; + int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1; + if (ranged_conflict(port, end, &rport, &rend)) + return 0; + } + + /* check for internal conflicts */ + for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { + if (tres != res && tres->flags & IORESOURCE_IO) { + tport = &tres->start; + tend = &tres->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 (i = 0; + (tres = pnp_get_resource(tdev, IORESOURCE_IO, i)); + i++) { + if (tres->flags & IORESOURCE_IO) { + if (cannot_compare(tres->flags)) + continue; + if (tres->flags & IORESOURCE_WINDOW) + continue; + tport = &tres->start; + tend = &tres->end; + if (ranged_conflict(port, end, tport, tend)) + return 0; + } + } + } + + return 1; +} + +int pnp_check_mem(struct pnp_dev *dev, struct resource *res) +{ + int i; + struct pnp_dev *tdev; + struct resource *tres; + resource_size_t *addr, *end, *taddr, *tend; + + addr = &res->start; + end = &res->end; + + /* if the resource doesn't exist, don't complain about it */ + if (cannot_compare(res->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 (!request_mem_region(*addr, length(addr, end), "pnp")) + return 0; + release_mem_region(*addr, length(addr, end)); + } + + /* check if the resource is reserved */ + for (i = 0; i < 8; i++) { + int raddr = pnp_reserve_mem[i << 1]; + int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1; + if (ranged_conflict(addr, end, &raddr, &rend)) + return 0; + } + + /* check for internal conflicts */ + for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { + if (tres != res && tres->flags & IORESOURCE_MEM) { + taddr = &tres->start; + tend = &tres->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 (i = 0; + (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i)); + i++) { + if (tres->flags & IORESOURCE_MEM) { + if (cannot_compare(tres->flags)) + continue; + if (tres->flags & IORESOURCE_WINDOW) + continue; + taddr = &tres->start; + tend = &tres->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; +} + +#ifdef CONFIG_PCI +static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci, + unsigned int irq) +{ + u32 class; + u8 progif; + + if (pci->irq == irq) { + pnp_dbg(&pnp->dev, " device %s using irq %d\n", + pci_name(pci), irq); + return 1; + } + + /* + * See pci_setup_device() and ata_pci_sff_activate_host() for + * similar IDE legacy detection. + */ + pci_read_config_dword(pci, PCI_CLASS_REVISION, &class); + class >>= 8; /* discard revision ID */ + progif = class & 0xff; + class >>= 8; + + if (class == PCI_CLASS_STORAGE_IDE) { + /* + * Unless both channels are native-PCI mode only, + * treat the compatibility IRQs as busy. + */ + if ((progif & 0x5) != 0x5) + if (pci_get_legacy_ide_irq(pci, 0) == irq || + pci_get_legacy_ide_irq(pci, 1) == irq) { + pnp_dbg(&pnp->dev, " legacy IDE device %s " + "using irq %d\n", pci_name(pci), irq); + return 1; + } + } + + return 0; +} +#endif + +static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq) +{ +#ifdef CONFIG_PCI + struct pci_dev *pci = NULL; + + for_each_pci_dev(pci) { + if (pci_dev_uses_irq(pnp, pci, irq)) { + pci_dev_put(pci); + return 1; + } + } +#endif + return 0; +} + +int pnp_check_irq(struct pnp_dev *dev, struct resource *res) +{ + int i; + struct pnp_dev *tdev; + struct resource *tres; + resource_size_t *irq; + + irq = &res->start; + + /* if the resource doesn't exist, don't complain about it */ + if (cannot_compare(res->flags)) + return 1; + + /* check if the resource is valid */ + if (*irq > 15) + return 0; + + /* check if the resource is reserved */ + for (i = 0; i < 16; i++) { + if (pnp_reserve_irq[i] == *irq) + return 0; + } + + /* check for internal conflicts */ + for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) { + if (tres != res && tres->flags & IORESOURCE_IRQ) { + if (tres->start == *irq) + return 0; + } + } + + /* check if the resource is being used by a pci device */ + if (pci_uses_irq(dev, *irq)) + 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_irq(*irq, pnp_test_handler, + 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 (i = 0; + (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i)); + i++) { + if (tres->flags & IORESOURCE_IRQ) { + if (cannot_compare(tres->flags)) + continue; + if (tres->start == *irq) + return 0; + } + } + } + + return 1; +} + +#ifdef CONFIG_ISA_DMA_API +int pnp_check_dma(struct pnp_dev *dev, struct resource *res) +{ + int i; + struct pnp_dev *tdev; + struct resource *tres; + resource_size_t *dma; + + dma = &res->start; + + /* if the resource doesn't exist, don't complain about it */ + if (cannot_compare(res->flags)) + return 1; + + /* check if the resource is valid */ + if (*dma == 4 || *dma > 7) + return 0; + + /* check if the resource is reserved */ + for (i = 0; i < 8; i++) { + if (pnp_reserve_dma[i] == *dma) + return 0; + } + + /* check for internal conflicts */ + for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) { + if (tres != res && tres->flags & IORESOURCE_DMA) { + if (tres->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 (i = 0; + (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i)); + i++) { + if (tres->flags & IORESOURCE_DMA) { + if (cannot_compare(tres->flags)) + continue; + if (tres->start == *dma) + return 0; + } + } + } + + return 1; +} +#endif /* CONFIG_ISA_DMA_API */ + +unsigned long pnp_resource_type(struct resource *res) +{ + return res->flags & (IORESOURCE_IO | IORESOURCE_MEM | + IORESOURCE_IRQ | IORESOURCE_DMA | + IORESOURCE_BUS); +} + +struct resource *pnp_get_resource(struct pnp_dev *dev, + unsigned long type, unsigned int num) +{ + struct pnp_resource *pnp_res; + struct resource *res; + + list_for_each_entry(pnp_res, &dev->resources, list) { + res = &pnp_res->res; + if (pnp_resource_type(res) == type && num-- == 0) + return res; + } + return NULL; +} +EXPORT_SYMBOL(pnp_get_resource); + +static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev) +{ + struct pnp_resource *pnp_res; + + pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL); + if (!pnp_res) + return NULL; + + list_add_tail(&pnp_res->list, &dev->resources); + return pnp_res; +} + +struct pnp_resource *pnp_add_resource(struct pnp_dev *dev, + struct resource *res) +{ + struct pnp_resource *pnp_res; + + pnp_res = pnp_new_resource(dev); + if (!pnp_res) { + dev_err(&dev->dev, "can't add resource %pR\n", res); + return NULL; + } + + pnp_res->res = *res; + pnp_res->res.name = dev->name; + dev_dbg(&dev->dev, "%pR\n", res); + return pnp_res; +} + +struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq, + int flags) +{ + 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 IRQ %d\n", irq); + return NULL; + } + + res = &pnp_res->res; + res->flags = IORESOURCE_IRQ | flags; + res->start = irq; + res->end = irq; + + dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); + return pnp_res; +} + +struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma, + int flags) +{ + 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 DMA %d\n", dma); + return NULL; + } + + res = &pnp_res->res; + res->flags = IORESOURCE_DMA | flags; + res->start = dma; + res->end = dma; + + dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); + return pnp_res; +} + +struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev, + resource_size_t start, + resource_size_t end, int flags) +{ + 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 IO %#llx-%#llx\n", + (unsigned long long) start, + (unsigned long long) end); + return NULL; + } + + res = &pnp_res->res; + res->flags = IORESOURCE_IO | flags; + res->start = start; + res->end = end; + + dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res); + return pnp_res; +} + +struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev, + resource_size_t start, + resource_size_t end, int flags) +{ + 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 MEM %#llx-%#llx\n", + (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); |