| /* |
| * 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> |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/pnp.h> |
| #include <linux/slab.h> |
| #include <linux/bitmap.h> |
| #include <linux/mutex.h> |
| #include "base.h" |
| |
| DEFINE_MUTEX(pnp_res_mutex); |
| |
| static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx) |
| { |
| struct resource *res; |
| |
| res = pnp_get_resource(dev, IORESOURCE_IO, idx); |
| if (!res) { |
| dev_err(&dev->dev, "too many I/O port resources\n"); |
| /* pretend we were successful so at least the manager won't try again */ |
| return 1; |
| } |
| |
| /* check if this resource has been manually set, if so skip */ |
| if (!(res->flags & IORESOURCE_AUTO)) { |
| dev_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 1; |
| } |
| |
| /* set the initial values */ |
| res->flags |= rule->flags | IORESOURCE_IO; |
| res->flags &= ~IORESOURCE_UNSET; |
| |
| if (!rule->size) { |
| res->flags |= IORESOURCE_DISABLED; |
| dev_dbg(&dev->dev, " io %d disabled\n", idx); |
| return 1; /* skip disabled resource requests */ |
| } |
| |
| res->start = rule->min; |
| res->end = res->start + rule->size - 1; |
| |
| /* run through until pnp_check_port is happy */ |
| while (!pnp_check_port(dev, res)) { |
| res->start += rule->align; |
| res->end = res->start + rule->size - 1; |
| if (res->start > rule->max || !rule->align) { |
| dev_dbg(&dev->dev, " couldn't assign io %d\n", idx); |
| return 0; |
| } |
| } |
| dev_dbg(&dev->dev, " assign io %d %#llx-%#llx\n", idx, |
| (unsigned long long) res->start, (unsigned long long) res->end); |
| return 1; |
| } |
| |
| static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx) |
| { |
| struct resource *res; |
| |
| res = pnp_get_resource(dev, IORESOURCE_MEM, idx); |
| if (!res) { |
| dev_err(&dev->dev, "too many memory resources\n"); |
| /* pretend we were successful so at least the manager won't try again */ |
| return 1; |
| } |
| |
| /* check if this resource has been manually set, if so skip */ |
| if (!(res->flags & IORESOURCE_AUTO)) { |
| dev_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 1; |
| } |
| |
| /* set the initial values */ |
| res->flags |= rule->flags | IORESOURCE_MEM; |
| res->flags &= ~IORESOURCE_UNSET; |
| |
| /* convert pnp flags to standard Linux flags */ |
| 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; |
| dev_dbg(&dev->dev, " mem %d disabled\n", idx); |
| return 1; /* skip disabled resource requests */ |
| } |
| |
| res->start = rule->min; |
| res->end = res->start + rule->size - 1; |
| |
| /* run through until pnp_check_mem is happy */ |
| while (!pnp_check_mem(dev, res)) { |
| res->start += rule->align; |
| res->end = res->start + rule->size - 1; |
| if (res->start > rule->max || !rule->align) { |
| dev_dbg(&dev->dev, " couldn't assign mem %d\n", idx); |
| return 0; |
| } |
| } |
| dev_dbg(&dev->dev, " assign mem %d %#llx-%#llx\n", idx, |
| (unsigned long long) res->start, (unsigned long long) res->end); |
| return 1; |
| } |
| |
| static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx) |
| { |
| struct resource *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_get_resource(dev, IORESOURCE_IRQ, idx); |
| if (!res) { |
| dev_err(&dev->dev, "too many IRQ resources\n"); |
| /* pretend we were successful so at least the manager won't try again */ |
| return 1; |
| } |
| |
| /* check if this resource has been manually set, if so skip */ |
| if (!(res->flags & IORESOURCE_AUTO)) { |
| dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n", |
| idx, (int) res->start, res->flags); |
| return 1; |
| } |
| |
| /* set the initial values */ |
| res->flags |= rule->flags | IORESOURCE_IRQ; |
| res->flags &= ~IORESOURCE_UNSET; |
| |
| if (bitmap_empty(rule->map, PNP_IRQ_NR)) { |
| res->flags |= IORESOURCE_DISABLED; |
| dev_dbg(&dev->dev, " irq %d disabled\n", idx); |
| return 1; /* skip disabled resource requests */ |
| } |
| |
| /* TBD: need check for >16 IRQ */ |
| res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16); |
| if (res->start < PNP_IRQ_NR) { |
| res->end = res->start; |
| dev_dbg(&dev->dev, " assign irq %d %d\n", idx, |
| (int) res->start); |
| return 1; |
| } |
| for (i = 0; i < 16; i++) { |
| if (test_bit(xtab[i], rule->map)) { |
| res->start = res->end = xtab[i]; |
| if (pnp_check_irq(dev, res)) { |
| dev_dbg(&dev->dev, " assign irq %d %d\n", idx, |
| (int) res->start); |
| return 1; |
| } |
| } |
| } |
| dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx); |
| return 0; |
| } |
| |
| static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx) |
| { |
| struct resource *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_get_resource(dev, IORESOURCE_DMA, idx); |
| if (!res) { |
| dev_err(&dev->dev, "too many DMA resources\n"); |
| return; |
| } |
| |
| /* check if this resource has been manually set, if so skip */ |
| if (!(res->flags & IORESOURCE_AUTO)) { |
| dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n", |
| idx, (int) res->start, res->flags); |
| return; |
| } |
| |
| /* set the initial values */ |
| res->flags |= rule->flags | IORESOURCE_DMA; |
| res->flags &= ~IORESOURCE_UNSET; |
| |
| for (i = 0; i < 8; i++) { |
| if (rule->map & (1 << xtab[i])) { |
| res->start = res->end = xtab[i]; |
| if (pnp_check_dma(dev, res)) { |
| dev_dbg(&dev->dev, " assign dma %d %d\n", idx, |
| (int) res->start); |
| return; |
| } |
| } |
| } |
| #ifdef MAX_DMA_CHANNELS |
| res->start = res->end = MAX_DMA_CHANNELS; |
| #endif |
| res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; |
| dev_dbg(&dev->dev, " disable dma %d\n", idx); |
| } |
| |
| void pnp_init_resource(struct resource *res) |
| { |
| unsigned long type; |
| |
| type = res->flags & (IORESOURCE_IO | IORESOURCE_MEM | |
| IORESOURCE_IRQ | IORESOURCE_DMA); |
| |
| res->name = NULL; |
| res->flags = type | IORESOURCE_AUTO | IORESOURCE_UNSET; |
| if (type == IORESOURCE_IRQ || type == IORESOURCE_DMA) { |
| res->start = -1; |
| res->end = -1; |
| } else { |
| res->start = 0; |
| res->end = 0; |
| } |
| } |
| |
| /** |
| * pnp_init_resources - Resets a resource table to default values. |
| * @table: pointer to the desired resource table |
| */ |
| void pnp_init_resources(struct pnp_dev *dev) |
| { |
| struct resource *res; |
| int idx; |
| |
| for (idx = 0; idx < PNP_MAX_IRQ; idx++) { |
| res = &dev->res->irq_resource[idx]; |
| res->flags = IORESOURCE_IRQ; |
| pnp_init_resource(res); |
| } |
| for (idx = 0; idx < PNP_MAX_DMA; idx++) { |
| res = &dev->res->dma_resource[idx]; |
| res->flags = IORESOURCE_DMA; |
| pnp_init_resource(res); |
| } |
| for (idx = 0; idx < PNP_MAX_PORT; idx++) { |
| res = &dev->res->port_resource[idx]; |
| res->flags = IORESOURCE_IO; |
| pnp_init_resource(res); |
| } |
| for (idx = 0; idx < PNP_MAX_MEM; idx++) { |
| res = &dev->res->mem_resource[idx]; |
| res->flags = IORESOURCE_MEM; |
| pnp_init_resource(res); |
| } |
| } |
| |
| /** |
| * pnp_clean_resources - clears resources that were not manually set |
| * @res: the resources to clean |
| */ |
| static void pnp_clean_resource_table(struct pnp_dev *dev) |
| { |
| struct resource *res; |
| int idx; |
| |
| for (idx = 0; idx < PNP_MAX_IRQ; idx++) { |
| res = &dev->res->irq_resource[idx]; |
| if (res->flags & IORESOURCE_AUTO) { |
| res->flags = IORESOURCE_IRQ; |
| pnp_init_resource(res); |
| } |
| } |
| for (idx = 0; idx < PNP_MAX_DMA; idx++) { |
| res = &dev->res->dma_resource[idx]; |
| if (res->flags & IORESOURCE_AUTO) { |
| res->flags = IORESOURCE_DMA; |
| pnp_init_resource(res); |
| } |
| } |
| for (idx = 0; idx < PNP_MAX_PORT; idx++) { |
| res = &dev->res->port_resource[idx]; |
| if (res->flags & IORESOURCE_AUTO) { |
| res->flags = IORESOURCE_IO; |
| pnp_init_resource(res); |
| } |
| } |
| for (idx = 0; idx < PNP_MAX_MEM; idx++) { |
| res = &dev->res->mem_resource[idx]; |
| if (res->flags & IORESOURCE_AUTO) { |
| res->flags = IORESOURCE_MEM; |
| pnp_init_resource(res); |
| } |
| } |
| } |
| |
| /** |
| * pnp_assign_resources - assigns resources to the device based on the specified dependent number |
| * @dev: pointer to the desired device |
| * @depnum: the dependent function number |
| * |
| * Only set depnum to 0 if the device does not have dependent options. |
| */ |
| static int pnp_assign_resources(struct pnp_dev *dev, int depnum) |
| { |
| struct pnp_port *port; |
| struct pnp_mem *mem; |
| struct pnp_irq *irq; |
| struct pnp_dma *dma; |
| int nport = 0, nmem = 0, nirq = 0, ndma = 0; |
| |
| if (!pnp_can_configure(dev)) |
| return -ENODEV; |
| |
| dbg_pnp_show_resources(dev, "before pnp_assign_resources"); |
| mutex_lock(&pnp_res_mutex); |
| pnp_clean_resource_table(dev); |
| if (dev->independent) { |
| dev_dbg(&dev->dev, "assigning independent options\n"); |
| port = dev->independent->port; |
| mem = dev->independent->mem; |
| irq = dev->independent->irq; |
| dma = dev->independent->dma; |
| while (port) { |
| if (!pnp_assign_port(dev, port, nport)) |
| goto fail; |
| nport++; |
| port = port->next; |
| } |
| while (mem) { |
| if (!pnp_assign_mem(dev, mem, nmem)) |
| goto fail; |
| nmem++; |
| mem = mem->next; |
| } |
| while (irq) { |
| if (!pnp_assign_irq(dev, irq, nirq)) |
| goto fail; |
| nirq++; |
| irq = irq->next; |
| } |
| while (dma) { |
| pnp_assign_dma(dev, dma, ndma); |
| ndma++; |
| dma = dma->next; |
| } |
| } |
| |
| if (depnum) { |
| struct pnp_option *dep; |
| int i; |
| |
| dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum); |
| for (i = 1, dep = dev->dependent; i < depnum; |
| i++, dep = dep->next) |
| if (!dep) |
| goto fail; |
| port = dep->port; |
| mem = dep->mem; |
| irq = dep->irq; |
| dma = dep->dma; |
| while (port) { |
| if (!pnp_assign_port(dev, port, nport)) |
| goto fail; |
| nport++; |
| port = port->next; |
| } |
| while (mem) { |
| if (!pnp_assign_mem(dev, mem, nmem)) |
| goto fail; |
| nmem++; |
| mem = mem->next; |
| } |
| while (irq) { |
| if (!pnp_assign_irq(dev, irq, nirq)) |
| goto fail; |
| nirq++; |
| irq = irq->next; |
| } |
| while (dma) { |
| pnp_assign_dma(dev, dma, ndma); |
| ndma++; |
| dma = dma->next; |
| } |
| } else if (dev->dependent) |
| goto fail; |
| |
| mutex_unlock(&pnp_res_mutex); |
| dbg_pnp_show_resources(dev, "after pnp_assign_resources"); |
| return 1; |
| |
| fail: |
| pnp_clean_resource_table(dev); |
| mutex_unlock(&pnp_res_mutex); |
| dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)"); |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| struct pnp_option *dep; |
| int i = 1; |
| |
| if (!pnp_can_configure(dev)) { |
| dev_dbg(&dev->dev, "configuration not supported\n"); |
| return -ENODEV; |
| } |
| |
| if (!dev->dependent) { |
| if (pnp_assign_resources(dev, 0)) |
| return 0; |
| } else { |
| dep = dev->dependent; |
| do { |
| if (pnp_assign_resources(dev, i)) |
| return 0; |
| dep = dep->next; |
| i++; |
| } while (dep); |
| } |
| |
| dev_err(&dev->dev, "unable to assign resources\n"); |
| return -EBUSY; |
| } |
| |
| /** |
| * 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)) { |
| dev_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)) { |
| dev_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); |