// SPDX-License-Identifier: GPL-2.0/* * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices * * 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/errno.h>#include <linux/module.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/pnp.h>#include <linux/bitmap.h>#include <linux/mutex.h>#include "base.h" DEFINE_MUTEX(pnp_res_mutex); static struct resource *pnp_find_resource(struct pnp_dev *dev,					  unsigned char rule,					  unsigned long type,					  unsigned int bar){	struct resource *res = pnp_get_resource(dev, type, bar); 	/* when the resource already exists, set its resource bits from rule */	if (res) {		res->flags &= ~IORESOURCE_BITS;		res->flags |= rule & IORESOURCE_BITS;	} 	return res;} static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx){	struct resource *res, local_res; 	res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx);	if (res) {		pnp_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "			"flags %#lx\n", idx, (unsigned long long) res->start,			(unsigned long long) res->end, res->flags);		return 0;	} 	res = &local_res;	res->flags = rule->flags | IORESOURCE_AUTO;	res->start = 0;	res->end = 0; 	if (!rule->size) {		res->flags |= IORESOURCE_DISABLED;		pnp_dbg(&dev->dev, "  io %d disabled\n", idx);		goto __add;	} 	res->start = rule->min;	res->end = res->start + rule->size - 1; 	while (!pnp_check_port(dev, res)) {		res->start += rule->align;		res->end = res->start + rule->size - 1;		if (res->start > rule->max || !rule->align) {			pnp_dbg(&dev->dev, "  couldn't assign io %d "				"(min %#llx max %#llx)\n", idx,				(unsigned long long) rule->min,				(unsigned long long) rule->max);			return -EBUSY;		}	} __add:	pnp_add_io_resource(dev, res->start, res->end, res->flags);	return 0;} static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx){	struct resource *res, local_res; 	res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);	if (res) {		pnp_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "			"flags %#lx\n", idx, (unsigned long long) res->start,			(unsigned long long) res->end, res->flags);		return 0;	} 	res = &local_res;	res->flags = rule->flags | IORESOURCE_AUTO;	res->start = 0;	res->end = 0; 	/* ??? rule->flags restricted to 8 bits, all tests bogus ??? */	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))		res->flags |= IORESOURCE_READONLY;	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)		res->flags |= IORESOURCE_RANGELENGTH;	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)		res->flags |= IORESOURCE_SHADOWABLE; 	if (!rule->size) {		res->flags |= IORESOURCE_DISABLED;		pnp_dbg(&dev->dev, "  mem %d disabled\n", idx);		goto __add;	} 	res->start = rule->min;	res->end = res->start + rule->size - 1; 	while (!pnp_check_mem(dev, res)) {		res->start += rule->align;		res->end = res->start + rule->size - 1;		if (res->start > rule->max || !rule->align) {			pnp_dbg(&dev->dev, "  couldn't assign mem %d "				"(min %#llx max %#llx)\n", idx,				(unsigned long long) rule->min,				(unsigned long long) rule->max);			return -EBUSY;		}	} __add:	pnp_add_mem_resource(dev, res->start, res->end, res->flags);	return 0;} static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx){	struct resource *res, local_res;	int i; 	/* IRQ priority: this table is good for i386 */	static unsigned short xtab[16] = {		5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2	}; 	res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);	if (res) {		pnp_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",			idx, (int) res->start, res->flags);		return 0;	} 	res = &local_res;	res->flags = rule->flags | IORESOURCE_AUTO;	res->start = -1;	res->end = -1; 	if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {		res->flags |= IORESOURCE_DISABLED;		pnp_dbg(&dev->dev, "  irq %d disabled\n", idx);		goto __add;	} 	/* TBD: need check for >16 IRQ */	res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);	if (res->start < PNP_IRQ_NR) {		res->end = res->start;		goto __add;	}	for (i = 0; i < 16; i++) {		if (test_bit(xtab[i], rule->map.bits)) {			res->start = res->end = xtab[i];			if (pnp_check_irq(dev, res))				goto __add;		}	} 	if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {		res->start = -1;		res->end = -1;		res->flags |= IORESOURCE_DISABLED;		pnp_dbg(&dev->dev, "  irq %d disabled (optional)\n", idx);		goto __add;	} 	pnp_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);	return -EBUSY; __add:	pnp_add_irq_resource(dev, res->start, res->flags);	return 0;} #ifdef CONFIG_ISA_DMA_APIstatic int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx){	struct resource *res, local_res;	int i; 	/* DMA priority: this table is good for i386 */	static unsigned short xtab[8] = {		1, 3, 5, 6, 7, 0, 2, 4	}; 	res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx);	if (res) {		pnp_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",			idx, (int) res->start, res->flags);		return 0;	} 	res = &local_res;	res->flags = rule->flags | IORESOURCE_AUTO;	res->start = -1;	res->end = -1; 	if (!rule->map) {		res->flags |= IORESOURCE_DISABLED;		pnp_dbg(&dev->dev, "  dma %d disabled\n", idx);		goto __add;	} 	for (i = 0; i < 8; i++) {		if (rule->map & (1 << xtab[i])) {			res->start = res->end = xtab[i];			if (pnp_check_dma(dev, res))				goto __add;		}	} 	pnp_dbg(&dev->dev, "  couldn't assign dma %d\n", idx);	return -EBUSY; __add:	pnp_add_dma_resource(dev, res->start, res->flags);	return 0;}#endif /* CONFIG_ISA_DMA_API */ void pnp_init_resources(struct pnp_dev *dev){	pnp_free_resources(dev);} static void pnp_clean_resource_table(struct pnp_dev *dev){	struct pnp_resource *pnp_res, *tmp; 	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {		if (pnp_res->res.flags & IORESOURCE_AUTO)			pnp_free_resource(pnp_res);	}} /** * pnp_assign_resources - assigns resources to the device based on the specified dependent number * @dev: pointer to the desired device * @set: the dependent function number */static int pnp_assign_resources(struct pnp_dev *dev, int set){	struct pnp_option *option;	int nport = 0, nmem = 0, nirq = 0;	int ndma __maybe_unused = 0;	int ret = 0; 	pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);	mutex_lock(&pnp_res_mutex);	pnp_clean_resource_table(dev); 	list_for_each_entry(option, &dev->options, list) {		if (pnp_option_is_dependent(option) &&		    pnp_option_set(option) != set)				continue; 		switch (option->type) {		case IORESOURCE_IO:			ret = pnp_assign_port(dev, &option->u.port, nport++);			break;		case IORESOURCE_MEM:			ret = pnp_assign_mem(dev, &option->u.mem, nmem++);			break;		case IORESOURCE_IRQ:			ret = pnp_assign_irq(dev, &option->u.irq, nirq++);			break;#ifdef CONFIG_ISA_DMA_API		case IORESOURCE_DMA:			ret = pnp_assign_dma(dev, &option->u.dma, ndma++);			break;#endif		default:			ret = -EINVAL;			break;		}		if (ret < 0)			break;	} 	mutex_unlock(&pnp_res_mutex);	if (ret < 0) {		pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);		pnp_clean_resource_table(dev);	} else		dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");	return ret;} /** * pnp_auto_config_dev - automatically assigns resources to a device * @dev: pointer to the desired device */int pnp_auto_config_dev(struct pnp_dev *dev){	int i, ret; 	if (!pnp_can_configure(dev)) {		pnp_dbg(&dev->dev, "configuration not supported\n");		return -ENODEV;	} 	ret = pnp_assign_resources(dev, 0);	if (ret == 0)		return 0; 	for (i = 1; i < dev->num_dependent_sets; i++) {		ret = pnp_assign_resources(dev, i);		if (ret == 0)			return 0;	} 	dev_err(&dev->dev, "unable to assign resources\n");	return ret;} /** * pnp_start_dev - low-level start of the PnP device * @dev: pointer to the desired device * * assumes that resources have already been allocated */int pnp_start_dev(struct pnp_dev *dev){	if (!pnp_can_write(dev)) {		pnp_dbg(&dev->dev, "activation not supported\n");		return -EINVAL;	} 	dbg_pnp_show_resources(dev, "pnp_start_dev");	if (dev->protocol->set(dev) < 0) {		dev_err(&dev->dev, "activation failed\n");		return -EIO;	} 	dev_info(&dev->dev, "activated\n");	return 0;}EXPORT_SYMBOL(pnp_start_dev); /** * pnp_stop_dev - low-level disable of the PnP device * @dev: pointer to the desired device * * does not free resources */int pnp_stop_dev(struct pnp_dev *dev){	if (!pnp_can_disable(dev)) {		pnp_dbg(&dev->dev, "disabling not supported\n");		return -EINVAL;	}	if (dev->protocol->disable(dev) < 0) {		dev_err(&dev->dev, "disable failed\n");		return -EIO;	} 	dev_info(&dev->dev, "disabled\n");	return 0;}EXPORT_SYMBOL(pnp_stop_dev); /** * pnp_activate_dev - activates a PnP device for use * @dev: pointer to the desired device * * does not validate or set resources so be careful. */int pnp_activate_dev(struct pnp_dev *dev){	int error; 	if (dev->active)		return 0; 	/* ensure resources are allocated */	if (pnp_auto_config_dev(dev))		return -EBUSY; 	error = pnp_start_dev(dev);	if (error)		return error; 	dev->active = 1;	return 0;}EXPORT_SYMBOL(pnp_activate_dev); /** * pnp_disable_dev - disables device * @dev: pointer to the desired device * * inform the correct pnp protocol so that resources can be used by other devices */int pnp_disable_dev(struct pnp_dev *dev){	int error; 	if (!dev->active)		return 0; 	error = pnp_stop_dev(dev);	if (error)		return error; 	dev->active = 0; 	/* release the resources so that other devices can use them */	mutex_lock(&pnp_res_mutex);	pnp_clean_resource_table(dev);	mutex_unlock(&pnp_res_mutex); 	return 0;}EXPORT_SYMBOL(pnp_disable_dev);