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1// SPDX-License-Identifier: GPL-2.02/*3 * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices4 *5 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>6 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>7 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.8 * Bjorn Helgaas <bjorn.helgaas@hp.com>9 */10 11#include <linux/errno.h>12#include <linux/module.h>13#include <linux/init.h>14#include <linux/kernel.h>15#include <linux/pnp.h>16#include <linux/bitmap.h>17#include <linux/mutex.h>18#include "base.h"19 20DEFINE_MUTEX(pnp_res_mutex);21 22static struct resource *pnp_find_resource(struct pnp_dev *dev,23 unsigned char rule,24 unsigned long type,25 unsigned int bar)26{27 struct resource *res = pnp_get_resource(dev, type, bar);28 29 /* when the resource already exists, set its resource bits from rule */30 if (res) {31 res->flags &= ~IORESOURCE_BITS;32 res->flags |= rule & IORESOURCE_BITS;33 }34 35 return res;36}37 38static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)39{40 struct resource *res, local_res;41 42 res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);43 if (res) {44 pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx "45 "flags %#lx\n", idx, (unsigned long long) res->start,46 (unsigned long long) res->end, res->flags);47 return 0;48 }49 50 res = &local_res;51 res->flags = rule->flags | IORESOURCE_AUTO;52 res->start = 0;53 res->end = 0;54 55 if (!rule->size) {56 res->flags |= IORESOURCE_DISABLED;57 pnp_dbg(&dev->dev, " io %d disabled\n", idx);58 goto __add;59 }60 61 res->start = rule->min;62 res->end = res->start + rule->size - 1;63 64 while (!pnp_check_port(dev, res)) {65 res->start += rule->align;66 res->end = res->start + rule->size - 1;67 if (res->start > rule->max || !rule->align) {68 pnp_dbg(&dev->dev, " couldn't assign io %d "69 "(min %#llx max %#llx)\n", idx,70 (unsigned long long) rule->min,71 (unsigned long long) rule->max);72 return -EBUSY;73 }74 }75 76__add:77 pnp_add_io_resource(dev, res->start, res->end, res->flags);78 return 0;79}80 81static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)82{83 struct resource *res, local_res;84 85 res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);86 if (res) {87 pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "88 "flags %#lx\n", idx, (unsigned long long) res->start,89 (unsigned long long) res->end, res->flags);90 return 0;91 }92 93 res = &local_res;94 res->flags = rule->flags | IORESOURCE_AUTO;95 res->start = 0;96 res->end = 0;97 98 /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */99 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))100 res->flags |= IORESOURCE_READONLY;101 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)102 res->flags |= IORESOURCE_RANGELENGTH;103 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)104 res->flags |= IORESOURCE_SHADOWABLE;105 106 if (!rule->size) {107 res->flags |= IORESOURCE_DISABLED;108 pnp_dbg(&dev->dev, " mem %d disabled\n", idx);109 goto __add;110 }111 112 res->start = rule->min;113 res->end = res->start + rule->size - 1;114 115 while (!pnp_check_mem(dev, res)) {116 res->start += rule->align;117 res->end = res->start + rule->size - 1;118 if (res->start > rule->max || !rule->align) {119 pnp_dbg(&dev->dev, " couldn't assign mem %d "120 "(min %#llx max %#llx)\n", idx,121 (unsigned long long) rule->min,122 (unsigned long long) rule->max);123 return -EBUSY;124 }125 }126 127__add:128 pnp_add_mem_resource(dev, res->start, res->end, res->flags);129 return 0;130}131 132static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)133{134 struct resource *res, local_res;135 int i;136 137 /* IRQ priority: this table is good for i386 */138 static unsigned short xtab[16] = {139 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2140 };141 142 res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);143 if (res) {144 pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",145 idx, (int) res->start, res->flags);146 return 0;147 }148 149 res = &local_res;150 res->flags = rule->flags | IORESOURCE_AUTO;151 res->start = -1;152 res->end = -1;153 154 if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {155 res->flags |= IORESOURCE_DISABLED;156 pnp_dbg(&dev->dev, " irq %d disabled\n", idx);157 goto __add;158 }159 160 /* TBD: need check for >16 IRQ */161 res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);162 if (res->start < PNP_IRQ_NR) {163 res->end = res->start;164 goto __add;165 }166 for (i = 0; i < 16; i++) {167 if (test_bit(xtab[i], rule->map.bits)) {168 res->start = res->end = xtab[i];169 if (pnp_check_irq(dev, res))170 goto __add;171 }172 }173 174 if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {175 res->start = -1;176 res->end = -1;177 res->flags |= IORESOURCE_DISABLED;178 pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);179 goto __add;180 }181 182 pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);183 return -EBUSY;184 185__add:186 pnp_add_irq_resource(dev, res->start, res->flags);187 return 0;188}189 190#ifdef CONFIG_ISA_DMA_API191static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)192{193 struct resource *res, local_res;194 int i;195 196 /* DMA priority: this table is good for i386 */197 static unsigned short xtab[8] = {198 1, 3, 5, 6, 7, 0, 2, 4199 };200 201 res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);202 if (res) {203 pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",204 idx, (int) res->start, res->flags);205 return 0;206 }207 208 res = &local_res;209 res->flags = rule->flags | IORESOURCE_AUTO;210 res->start = -1;211 res->end = -1;212 213 if (!rule->map) {214 res->flags |= IORESOURCE_DISABLED;215 pnp_dbg(&dev->dev, " dma %d disabled\n", idx);216 goto __add;217 }218 219 for (i = 0; i < 8; i++) {220 if (rule->map & (1 << xtab[i])) {221 res->start = res->end = xtab[i];222 if (pnp_check_dma(dev, res))223 goto __add;224 }225 }226 227 pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx);228 return -EBUSY;229 230__add:231 pnp_add_dma_resource(dev, res->start, res->flags);232 return 0;233}234#endif /* CONFIG_ISA_DMA_API */235 236void pnp_init_resources(struct pnp_dev *dev)237{238 pnp_free_resources(dev);239}240 241static void pnp_clean_resource_table(struct pnp_dev *dev)242{243 struct pnp_resource *pnp_res, *tmp;244 245 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {246 if (pnp_res->res.flags & IORESOURCE_AUTO)247 pnp_free_resource(pnp_res);248 }249}250 251/**252 * pnp_assign_resources - assigns resources to the device based on the specified dependent number253 * @dev: pointer to the desired device254 * @set: the dependent function number255 */256static int pnp_assign_resources(struct pnp_dev *dev, int set)257{258 struct pnp_option *option;259 int nport = 0, nmem = 0, nirq = 0;260 int ndma __maybe_unused = 0;261 int ret = 0;262 263 pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);264 mutex_lock(&pnp_res_mutex);265 pnp_clean_resource_table(dev);266 267 list_for_each_entry(option, &dev->options, list) {268 if (pnp_option_is_dependent(option) &&269 pnp_option_set(option) != set)270 continue;271 272 switch (option->type) {273 case IORESOURCE_IO:274 ret = pnp_assign_port(dev, &option->u.port, nport++);275 break;276 case IORESOURCE_MEM:277 ret = pnp_assign_mem(dev, &option->u.mem, nmem++);278 break;279 case IORESOURCE_IRQ:280 ret = pnp_assign_irq(dev, &option->u.irq, nirq++);281 break;282#ifdef CONFIG_ISA_DMA_API283 case IORESOURCE_DMA:284 ret = pnp_assign_dma(dev, &option->u.dma, ndma++);285 break;286#endif287 default:288 ret = -EINVAL;289 break;290 }291 if (ret < 0)292 break;293 }294 295 mutex_unlock(&pnp_res_mutex);296 if (ret < 0) {297 pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);298 pnp_clean_resource_table(dev);299 } else300 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");301 return ret;302}303 304/**305 * pnp_auto_config_dev - automatically assigns resources to a device306 * @dev: pointer to the desired device307 */308int pnp_auto_config_dev(struct pnp_dev *dev)309{310 int i, ret;311 312 if (!pnp_can_configure(dev)) {313 pnp_dbg(&dev->dev, "configuration not supported\n");314 return -ENODEV;315 }316 317 ret = pnp_assign_resources(dev, 0);318 if (ret == 0)319 return 0;320 321 for (i = 1; i < dev->num_dependent_sets; i++) {322 ret = pnp_assign_resources(dev, i);323 if (ret == 0)324 return 0;325 }326 327 dev_err(&dev->dev, "unable to assign resources\n");328 return ret;329}330 331/**332 * pnp_start_dev - low-level start of the PnP device333 * @dev: pointer to the desired device334 *335 * assumes that resources have already been allocated336 */337int pnp_start_dev(struct pnp_dev *dev)338{339 if (!pnp_can_write(dev)) {340 pnp_dbg(&dev->dev, "activation not supported\n");341 return -EINVAL;342 }343 344 dbg_pnp_show_resources(dev, "pnp_start_dev");345 if (dev->protocol->set(dev) < 0) {346 dev_err(&dev->dev, "activation failed\n");347 return -EIO;348 }349 350 dev_info(&dev->dev, "activated\n");351 return 0;352}353EXPORT_SYMBOL(pnp_start_dev);354 355/**356 * pnp_stop_dev - low-level disable of the PnP device357 * @dev: pointer to the desired device358 *359 * does not free resources360 */361int pnp_stop_dev(struct pnp_dev *dev)362{363 if (!pnp_can_disable(dev)) {364 pnp_dbg(&dev->dev, "disabling not supported\n");365 return -EINVAL;366 }367 if (dev->protocol->disable(dev) < 0) {368 dev_err(&dev->dev, "disable failed\n");369 return -EIO;370 }371 372 dev_info(&dev->dev, "disabled\n");373 return 0;374}375EXPORT_SYMBOL(pnp_stop_dev);376 377/**378 * pnp_activate_dev - activates a PnP device for use379 * @dev: pointer to the desired device380 *381 * does not validate or set resources so be careful.382 */383int pnp_activate_dev(struct pnp_dev *dev)384{385 int error;386 387 if (dev->active)388 return 0;389 390 /* ensure resources are allocated */391 if (pnp_auto_config_dev(dev))392 return -EBUSY;393 394 error = pnp_start_dev(dev);395 if (error)396 return error;397 398 dev->active = 1;399 return 0;400}401EXPORT_SYMBOL(pnp_activate_dev);402 403/**404 * pnp_disable_dev - disables device405 * @dev: pointer to the desired device406 *407 * inform the correct pnp protocol so that resources can be used by other devices408 */409int pnp_disable_dev(struct pnp_dev *dev)410{411 int error;412 413 if (!dev->active)414 return 0;415 416 error = pnp_stop_dev(dev);417 if (error)418 return error;419 420 dev->active = 0;421 422 /* release the resources so that other devices can use them */423 mutex_lock(&pnp_res_mutex);424 pnp_clean_resource_table(dev);425 mutex_unlock(&pnp_res_mutex);426 427 return 0;428}429EXPORT_SYMBOL(pnp_disable_dev);430