From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/pnp/manager.c | 431 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 431 insertions(+) create mode 100644 drivers/pnp/manager.c (limited to 'drivers/pnp/manager.c') diff --git a/drivers/pnp/manager.c b/drivers/pnp/manager.c new file mode 100644 index 000000000..9357aa779 --- /dev/null +++ b/drivers/pnp/manager.c @@ -0,0 +1,431 @@ +/* + * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices + * + * based on isapnp.c resource management (c) Jaroslav Kysela + * Copyright 2003 Adam Belay + * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. + * Bjorn Helgaas + */ + +#include +#include +#include +#include +#include +#include +#include +#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_CACHEABLE) + res->flags |= IORESOURCE_CACHEABLE; + 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_API +static 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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_start_dev); +EXPORT_SYMBOL(pnp_stop_dev); +EXPORT_SYMBOL(pnp_activate_dev); +EXPORT_SYMBOL(pnp_disable_dev); -- cgit v1.2.3-54-g00ecf