![Bjorn Helgaas](/assets/img/avatar_default.png)
ISAPNP, PNPBIOS, and ACPI describe the "possible resource settings" of a device, i.e., the possibilities an OS bus driver has when it assigns I/O port, MMIO, and other resources to the device. PNP used to maintain this "possible resource setting" information in one independent option structure and a list of dependent option structures for each device. Each of these option structures had lists of I/O, memory, IRQ, and DMA resources, for example: dev independent options ind-io0 -> ind-io1 ... ind-mem0 -> ind-mem1 ... ... dependent option set 0 dep0-io0 -> dep0-io1 ... dep0-mem0 -> dep0-mem1 ... ... dependent option set 1 dep1-io0 -> dep1-io1 ... dep1-mem0 -> dep1-mem1 ... ... ... This data structure was designed for ISAPNP, where the OS configures device resource settings by writing directly to configuration registers. The OS can write the registers in arbitrary order much like it writes PCI BARs. However, for PNPBIOS and ACPI devices, the OS uses firmware interfaces that perform device configuration, and it is important to pass the desired settings to those interfaces in the correct order. The OS learns the correct order by using firmware interfaces that return the "current resource settings" and "possible resource settings," but the option structures above doesn't store the ordering information. This patch replaces the independent and dependent lists with a single list of options. For example, a device might have possible resource settings like this: dev options ind-io0 -> dep0-io0 -> dep1->io0 -> ind-io1 ... All the possible settings are in the same list, in the order they come from the firmware "possible resource settings" list. Each entry is tagged with an independent/dependent flag. Dependent entries also have a "set number" and an optional priority value. All dependent entries must be assigned from the same set. For example, the OS can use all the entries from dependent set 0, or all the entries from dependent set 1, but it cannot mix entries from set 0 with entries from set 1. Prior to this patch PNP didn't keep track of the order of this list, and it assigned all independent options first, then all dependent ones. Using the example above, that resulted in a "desired configuration" list like this: ind->io0 -> ind->io1 -> depN-io0 ... instead of the list the firmware expects, which looks like this: ind->io0 -> depN-io0 -> ind-io1 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Rene Herman <rene.herman@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
212 lines
5.5 KiB
C
212 lines
5.5 KiB
C
/*
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* support.c - standard functions for the use of pnp protocol drivers
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*
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/pnp.h>
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#include "base.h"
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/**
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* pnp_is_active - Determines if a device is active based on its current
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* resources
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* @dev: pointer to the desired PnP device
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*/
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int pnp_is_active(struct pnp_dev *dev)
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{
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/*
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* I don't think this is very reliable because pnp_disable_dev()
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* only clears out auto-assigned resources.
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*/
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if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
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!pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
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pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
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return 0;
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else
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return 1;
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}
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EXPORT_SYMBOL(pnp_is_active);
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/*
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* Functionally similar to acpi_ex_eisa_id_to_string(), but that's
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* buried in the ACPI CA, and we can't depend on it being present.
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*/
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void pnp_eisa_id_to_string(u32 id, char *str)
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{
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id = be32_to_cpu(id);
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/*
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* According to the specs, the first three characters are five-bit
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* compressed ASCII, and the left-over high order bit should be zero.
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* However, the Linux ISAPNP code historically used six bits for the
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* first character, and there seem to be IDs that depend on that,
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* e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
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* FreeBSD sys/pc98/cbus/sio_cbus.c driver.
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*/
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str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
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str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
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str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
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str[3] = hex_asc_hi(id >> 8);
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str[4] = hex_asc_lo(id >> 8);
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str[5] = hex_asc_hi(id);
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str[6] = hex_asc_lo(id);
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str[7] = '\0';
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}
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char *pnp_resource_type_name(struct resource *res)
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{
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switch (pnp_resource_type(res)) {
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case IORESOURCE_IO:
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return "io";
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case IORESOURCE_MEM:
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return "mem";
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case IORESOURCE_IRQ:
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return "irq";
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case IORESOURCE_DMA:
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return "dma";
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}
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return NULL;
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}
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void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
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{
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#ifdef DEBUG
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char buf[128];
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int len = 0;
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struct pnp_resource *pnp_res;
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struct resource *res;
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if (list_empty(&dev->resources)) {
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dev_dbg(&dev->dev, "%s: no current resources\n", desc);
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return;
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}
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dev_dbg(&dev->dev, "%s: current resources:\n", desc);
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list_for_each_entry(pnp_res, &dev->resources, list) {
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res = &pnp_res->res;
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len += snprintf(buf + len, sizeof(buf) - len, " %-3s ",
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pnp_resource_type_name(res));
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if (res->flags & IORESOURCE_DISABLED) {
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dev_dbg(&dev->dev, "%sdisabled\n", buf);
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continue;
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}
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switch (pnp_resource_type(res)) {
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case IORESOURCE_IO:
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case IORESOURCE_MEM:
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len += snprintf(buf + len, sizeof(buf) - len,
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"%#llx-%#llx flags %#lx",
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(unsigned long long) res->start,
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(unsigned long long) res->end,
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res->flags);
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break;
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case IORESOURCE_IRQ:
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case IORESOURCE_DMA:
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len += snprintf(buf + len, sizeof(buf) - len,
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"%lld flags %#lx",
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(unsigned long long) res->start,
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res->flags);
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break;
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}
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dev_dbg(&dev->dev, "%s\n", buf);
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}
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#endif
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}
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char *pnp_option_priority_name(struct pnp_option *option)
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{
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switch (pnp_option_priority(option)) {
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case PNP_RES_PRIORITY_PREFERRED:
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return "preferred";
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case PNP_RES_PRIORITY_ACCEPTABLE:
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return "acceptable";
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case PNP_RES_PRIORITY_FUNCTIONAL:
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return "functional";
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}
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return "invalid";
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}
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void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
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{
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#ifdef DEBUG
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char buf[128];
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int len = 0, i;
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struct pnp_port *port;
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struct pnp_mem *mem;
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struct pnp_irq *irq;
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struct pnp_dma *dma;
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if (pnp_option_is_dependent(option))
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len += snprintf(buf + len, sizeof(buf) - len,
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" dependent set %d (%s) ",
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pnp_option_set(option),
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pnp_option_priority_name(option));
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else
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len += snprintf(buf + len, sizeof(buf) - len, " independent ");
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switch (option->type) {
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case IORESOURCE_IO:
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port = &option->u.port;
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len += snprintf(buf + len, sizeof(buf) - len, "io min %#llx "
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"max %#llx align %lld size %lld flags %#x",
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(unsigned long long) port->min,
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(unsigned long long) port->max,
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(unsigned long long) port->align,
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(unsigned long long) port->size, port->flags);
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break;
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case IORESOURCE_MEM:
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mem = &option->u.mem;
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len += snprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
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"max %#llx align %lld size %lld flags %#x",
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(unsigned long long) mem->min,
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(unsigned long long) mem->max,
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(unsigned long long) mem->align,
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(unsigned long long) mem->size, mem->flags);
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break;
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case IORESOURCE_IRQ:
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irq = &option->u.irq;
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len += snprintf(buf + len, sizeof(buf) - len, "irq");
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if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
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len += snprintf(buf + len, sizeof(buf) - len,
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" <none>");
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else {
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for (i = 0; i < PNP_IRQ_NR; i++)
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if (test_bit(i, irq->map.bits))
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len += snprintf(buf + len,
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sizeof(buf) - len,
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" %d", i);
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}
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len += snprintf(buf + len, sizeof(buf) - len, " flags %#x",
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irq->flags);
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if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
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len += snprintf(buf + len, sizeof(buf) - len,
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" (optional)");
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break;
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case IORESOURCE_DMA:
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dma = &option->u.dma;
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len += snprintf(buf + len, sizeof(buf) - len, "dma");
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if (!dma->map)
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len += snprintf(buf + len, sizeof(buf) - len,
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" <none>");
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else {
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for (i = 0; i < 8; i++)
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if (dma->map & (1 << i))
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len += snprintf(buf + len,
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sizeof(buf) - len,
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" %d", i);
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}
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len += snprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
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"flags %#x", dma->map, dma->flags);
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break;
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}
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dev_dbg(&dev->dev, "%s\n", buf);
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#endif
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}
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