1 files changed, 526 insertions, 0 deletions

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
new file mode 100644
index 000000000000..a3868f6c222a
--- /dev/null
+++ b/drivers/acpi/resource.c
@@ -0,0 +1,526 @@
+/*
+ * drivers/acpi/resource.c - ACPI device resources interpretation.
+ *
+ * Copyright (C) 2012, Intel Corp.
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_X86
+#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
+#else
+#define valid_IRQ(i) (true)
+#endif
+
+static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect,
+                                                bool window)
+{
+        unsigned long flags = IORESOURCE_MEM;
+
+        if (len == 0)
+                flags |= IORESOURCE_DISABLED;
+
+        if (write_protect == ACPI_READ_WRITE_MEMORY)
+                flags |= IORESOURCE_MEM_WRITEABLE;
+
+        if (window)
+                flags |= IORESOURCE_WINDOW;
+
+        return flags;
+}
+
+static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
+                                     u8 write_protect)
+{
+        res->start = start;
+        res->end = start + len - 1;
+        res->flags = acpi_dev_memresource_flags(len, write_protect, false);
+}
+
+/**
+ * acpi_dev_resource_memory - Extract ACPI memory resource information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents a memory resource and
+ * if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
+{
+        struct acpi_resource_memory24 *memory24;
+        struct acpi_resource_memory32 *memory32;
+        struct acpi_resource_fixed_memory32 *fixed_memory32;
+
+        switch (ares->type) {
+        case ACPI_RESOURCE_TYPE_MEMORY24:
+                memory24 = &ares->data.memory24;
+                acpi_dev_get_memresource(res, memory24->minimum,
+                                         memory24->address_length,
+                                         memory24->write_protect);
+                break;
+        case ACPI_RESOURCE_TYPE_MEMORY32:
+                memory32 = &ares->data.memory32;
+                acpi_dev_get_memresource(res, memory32->minimum,
+                                         memory32->address_length,
+                                         memory32->write_protect);
+                break;
+        case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+                fixed_memory32 = &ares->data.fixed_memory32;
+                acpi_dev_get_memresource(res, fixed_memory32->address,
+                                         fixed_memory32->address_length,
+                                         fixed_memory32->write_protect);
+                break;
+        default:
+                return false;
+        }
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
+
+static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode,
+                                              bool window)
+{
+        int flags = IORESOURCE_IO;
+
+        if (io_decode == ACPI_DECODE_16)
+                flags |= IORESOURCE_IO_16BIT_ADDR;
+
+        if (start > end || end >= 0x10003)
+                flags |= IORESOURCE_DISABLED;
+
+        if (window)
+                flags |= IORESOURCE_WINDOW;
+
+        return flags;
+}
+
+static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
+                                    u8 io_decode)
+{
+        u64 end = start + len - 1;
+
+        res->start = start;
+        res->end = end;
+        res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false);
+}
+
+/**
+ * acpi_dev_resource_io - Extract ACPI I/O resource information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an I/O resource and
+ * if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
+{
+        struct acpi_resource_io *io;
+        struct acpi_resource_fixed_io *fixed_io;
+
+        switch (ares->type) {
+        case ACPI_RESOURCE_TYPE_IO:
+                io = &ares->data.io;
+                acpi_dev_get_ioresource(res, io->minimum,
+                                        io->address_length,
+                                        io->io_decode);
+                break;
+        case ACPI_RESOURCE_TYPE_FIXED_IO:
+                fixed_io = &ares->data.fixed_io;
+                acpi_dev_get_ioresource(res, fixed_io->address,
+                                        fixed_io->address_length,
+                                        ACPI_DECODE_10);
+                break;
+        default:
+                return false;
+        }
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
+
+/**
+ * acpi_dev_resource_address_space - Extract ACPI address space information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an address space resource
+ * and if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_address_space(struct acpi_resource *ares,
+                                     struct resource *res)
+{
+        acpi_status status;
+        struct acpi_resource_address64 addr;
+        bool window;
+        u64 len;
+        u8 io_decode;
+
+        switch (ares->type) {
+        case ACPI_RESOURCE_TYPE_ADDRESS16:
+        case ACPI_RESOURCE_TYPE_ADDRESS32:
+        case ACPI_RESOURCE_TYPE_ADDRESS64:
+                break;
+        default:
+                return false;
+        }
+
+        status = acpi_resource_to_address64(ares, &addr);
+        if (ACPI_FAILURE(status))
+                return true;
+
+        res->start = addr.minimum;
+        res->end = addr.maximum;
+        window = addr.producer_consumer == ACPI_PRODUCER;
+
+        switch(addr.resource_type) {
+        case ACPI_MEMORY_RANGE:
+                len = addr.maximum - addr.minimum + 1;
+                res->flags = acpi_dev_memresource_flags(len,
+                                                addr.info.mem.write_protect,
+                                                window);
+                break;
+        case ACPI_IO_RANGE:
+                io_decode = addr.granularity == 0xfff ?
+                                ACPI_DECODE_10 : ACPI_DECODE_16;
+                res->flags = acpi_dev_ioresource_flags(addr.minimum,
+                                                       addr.maximum,
+                                                       io_decode, window);
+                break;
+        case ACPI_BUS_NUMBER_RANGE:
+                res->flags = IORESOURCE_BUS;
+                break;
+        default:
+                res->flags = 0;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
+
+/**
+ * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an extended address space
+ * resource and if that's the case, use the information in it to populate the
+ * generic resource object pointed to by @res.
+ */
+bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
+                                         struct resource *res)
+{
+        struct acpi_resource_extended_address64 *ext_addr;
+        bool window;
+        u64 len;
+        u8 io_decode;
+
+        if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
+                return false;
+
+        ext_addr = &ares->data.ext_address64;
+
+        res->start = ext_addr->minimum;
+        res->end = ext_addr->maximum;
+        window = ext_addr->producer_consumer == ACPI_PRODUCER;
+
+        switch(ext_addr->resource_type) {
+        case ACPI_MEMORY_RANGE:
+                len = ext_addr->maximum - ext_addr->minimum + 1;
+                res->flags = acpi_dev_memresource_flags(len,
+                                        ext_addr->info.mem.write_protect,
+                                        window);
+                break;
+        case ACPI_IO_RANGE:
+                io_decode = ext_addr->granularity == 0xfff ?
+                                ACPI_DECODE_10 : ACPI_DECODE_16;
+                res->flags = acpi_dev_ioresource_flags(ext_addr->minimum,
+                                                       ext_addr->maximum,
+                                                       io_decode, window);
+                break;
+        case ACPI_BUS_NUMBER_RANGE:
+                res->flags = IORESOURCE_BUS;
+                break;
+        default:
+                res->flags = 0;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
+
+/**
+ * acpi_dev_irq_flags - Determine IRQ resource flags.
+ * @triggering: Triggering type as provided by ACPI.
+ * @polarity: Interrupt polarity as provided by ACPI.
+ * @shareable: Whether or not the interrupt is shareable.
+ */
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
+{
+        unsigned long flags;
+
+        if (triggering == ACPI_LEVEL_SENSITIVE)
+                flags = polarity == ACPI_ACTIVE_LOW ?
+                        IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
+        else
+                flags = polarity == ACPI_ACTIVE_LOW ?
+                        IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
+
+        if (shareable == ACPI_SHARED)
+                flags |= IORESOURCE_IRQ_SHAREABLE;
+
+        return flags | IORESOURCE_IRQ;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
+
+static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
+{
+        res->start = gsi;
+        res->end = gsi;
+        res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED;
+}
+
+static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
+                                     u8 triggering, u8 polarity, u8 shareable)
+{
+        int irq, p, t;
+
+        if (!valid_IRQ(gsi)) {
+                acpi_dev_irqresource_disabled(res, gsi);
+                return;
+        }
+
+        /*
+         * In IO-APIC mode, use overrided attribute. Two reasons:
+         * 1. BIOS bug in DSDT
+         * 2. BIOS uses IO-APIC mode Interrupt Source Override
+         */
+        if (!acpi_get_override_irq(gsi, &t, &p)) {
+                u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
+                u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
+
+                if (triggering != trig || polarity != pol) {
+                        pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
+                                   t ? "edge" : "level", p ? "low" : "high");
+                        triggering = trig;
+                        polarity = pol;
+                }
+        }
+
+        res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+        irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
+        if (irq >= 0) {
+                res->start = irq;
+                res->end = irq;
+        } else {
+                acpi_dev_irqresource_disabled(res, gsi);
+        }
+}
+
+/**
+ * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
+ * @ares: Input ACPI resource object.
+ * @index: Index into the array of GSIs represented by the resource.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an interrupt resource
+ * and @index does not exceed the resource's interrupt count (true is returned
+ * in that case regardless of the results of the other checks)).  If that's the
+ * case, register the GSI corresponding to @index from the array of interrupts
+ * represented by the resource and populate the generic resource object pointed
+ * to by @res accordingly.  If the registration of the GSI is not successful,
+ * IORESOURCE_DISABLED will be set it that object's flags.
+ */
+bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
+                                 struct resource *res)
+{
+        struct acpi_resource_irq *irq;
+        struct acpi_resource_extended_irq *ext_irq;
+
+        switch (ares->type) {
+        case ACPI_RESOURCE_TYPE_IRQ:
+                /*
+                 * Per spec, only one interrupt per descriptor is allowed in
+                 * _CRS, but some firmware violates this, so parse them all.
+                 */
+                irq = &ares->data.irq;
+                if (index >= irq->interrupt_count) {
+                        acpi_dev_irqresource_disabled(res, 0);
+                        return false;
+                }
+                acpi_dev_get_irqresource(res, irq->interrupts[index],
+                                         irq->triggering, irq->polarity,
+                                         irq->sharable);
+                break;
+        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
+                ext_irq = &ares->data.extended_irq;
+                if (index >= ext_irq->interrupt_count) {
+                        acpi_dev_irqresource_disabled(res, 0);
+                        return false;
+                }
+                acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
+                                         ext_irq->triggering, ext_irq->polarity,
+                                         ext_irq->sharable);
+                break;
+        default:
+                return false;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
+
+/**
+ * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
+ * @list: The head of the resource list to free.
+ */
+void acpi_dev_free_resource_list(struct list_head *list)
+{
+        struct resource_list_entry *rentry, *re;
+
+        list_for_each_entry_safe(rentry, re, list, node) {
+                list_del(&rentry->node);
+                kfree(rentry);
+        }
+}
+EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
+
+struct res_proc_context {
+        struct list_head *list;
+        int (*preproc)(struct acpi_resource *, void *);
+        void *preproc_data;
+        int count;
+        int error;
+};
+
+static acpi_status acpi_dev_new_resource_entry(struct resource *r,
+                                               struct res_proc_context *c)
+{
+        struct resource_list_entry *rentry;
+
+        rentry = kmalloc(sizeof(*rentry), GFP_KERNEL);
+        if (!rentry) {
+                c->error = -ENOMEM;
+                return AE_NO_MEMORY;
+        }
+        rentry->res = *r;
+        list_add_tail(&rentry->node, c->list);
+        c->count++;
+        return AE_OK;
+}
+
+static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
+                                             void *context)
+{
+        struct res_proc_context *c = context;
+        struct resource r;
+        int i;
+
+        if (c->preproc) {
+                int ret;
+
+                ret = c->preproc(ares, c->preproc_data);
+                if (ret < 0) {
+                        c->error = ret;
+                        return AE_CTRL_TERMINATE;
+                } else if (ret > 0) {
+                        return AE_OK;
+                }
+        }
+
+        memset(&r, 0, sizeof(r));
+
+        if (acpi_dev_resource_memory(ares, &r)
+            || acpi_dev_resource_io(ares, &r)
+            || acpi_dev_resource_address_space(ares, &r)
+            || acpi_dev_resource_ext_address_space(ares, &r))
+                return acpi_dev_new_resource_entry(&r, c);
+
+        for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
+                acpi_status status;
+
+                status = acpi_dev_new_resource_entry(&r, c);
+                if (ACPI_FAILURE(status))
+                        return status;
+        }
+
+        return AE_OK;
+}
+
+/**
+ * acpi_dev_get_resources - Get current resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ * @preproc: The caller's preprocessing routine.
+ * @preproc_data: Pointer passed to the caller's preprocessing routine.
+ *
+ * Evaluate the _CRS method for the given device node and process its output by
+ * (1) executing the @preproc() rountine provided by the caller, passing the
+ * resource pointer and @preproc_data to it as arguments, for each ACPI resource
+ * returned and (2) converting all of the returned ACPI resources into struct
+ * resource objects if possible.  If the return value of @preproc() in step (1)
+ * is different from 0, step (2) is not applied to the given ACPI resource and
+ * if that value is negative, the whole processing is aborted and that value is
+ * returned as the final error code.
+ *
+ * The resultant struct resource objects are put on the list pointed to by
+ * @list, that must be empty initially, as members of struct resource_list_entry
+ * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
+ * free that list.
+ *
+ * The number of resources in the output list is returned on success, an error
+ * code reflecting the error condition is returned otherwise.
+ */
+int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
+                           int (*preproc)(struct acpi_resource *, void *),
+                           void *preproc_data)
+{
+        struct res_proc_context c;
+        acpi_handle not_used;
+        acpi_status status;
+
+        if (!adev || !adev->handle || !list_empty(list))
+                return -EINVAL;
+
+        status = acpi_get_handle(adev->handle, METHOD_NAME__CRS, &not_used);
+        if (ACPI_FAILURE(status))
+                return 0;
+
+        c.list = list;
+        c.preproc = preproc;
+        c.preproc_data = preproc_data;
+        c.count = 0;
+        c.error = 0;
+        status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
+                                     acpi_dev_process_resource, &c);
+        if (ACPI_FAILURE(status)) {
+                acpi_dev_free_resource_list(list);
+                return c.error ? c.error : -EIO;
+        }
+
+        return c.count;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_resources);