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Diffstat (limited to 'arch/ia64/hp/common/aml_nfw.c')
-rw-r--r--arch/ia64/hp/common/aml_nfw.c232
1 files changed, 0 insertions, 232 deletions
diff --git a/arch/ia64/hp/common/aml_nfw.c b/arch/ia64/hp/common/aml_nfw.c
deleted file mode 100644
index 901df49461a0..000000000000
--- a/arch/ia64/hp/common/aml_nfw.c
+++ /dev/null
@@ -1,232 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * OpRegion handler to allow AML to call native firmware
- *
- * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
- * Bjorn Helgaas <bjorn.helgaas@hp.com>
- *
- * This driver implements HP Open Source Review Board proposal 1842,
- * which was approved on 9/20/2006.
- *
- * For technical documentation, see the HP SPPA Firmware EAS, Appendix F.
- *
- * ACPI does not define a mechanism for AML methods to call native firmware
- * interfaces such as PAL or SAL. This OpRegion handler adds such a mechanism.
- * After the handler is installed, an AML method can call native firmware by
- * storing the arguments and firmware entry point to specific offsets in the
- * OpRegion. When AML reads the "return value" offset from the OpRegion, this
- * handler loads up the arguments, makes the firmware call, and returns the
- * result.
- */
-
-#include <linux/module.h>
-#include <linux/acpi.h>
-#include <asm/sal.h>
-
-MODULE_AUTHOR("Bjorn Helgaas <bjorn.helgaas@hp.com>");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("ACPI opregion handler for native firmware calls");
-
-static bool force_register;
-module_param_named(force, force_register, bool, 0);
-MODULE_PARM_DESC(force, "Install opregion handler even without HPQ5001 device");
-
-#define AML_NFW_SPACE 0xA1
-
-struct ia64_pdesc {
- void *ip;
- void *gp;
-};
-
-/*
- * N.B. The layout of this structure is defined in the HP SPPA FW EAS, and
- * the member offsets are embedded in AML methods.
- */
-struct ia64_nfw_context {
- u64 arg[8];
- struct ia64_sal_retval ret;
- u64 ip;
- u64 gp;
- u64 pad[2];
-};
-
-static void *virt_map(u64 address)
-{
- if (address & (1UL << 63))
- return (void *) (__IA64_UNCACHED_OFFSET | address);
-
- return __va(address);
-}
-
-static void aml_nfw_execute(struct ia64_nfw_context *c)
-{
- struct ia64_pdesc virt_entry;
- ia64_sal_handler entry;
-
- virt_entry.ip = virt_map(c->ip);
- virt_entry.gp = virt_map(c->gp);
-
- entry = (ia64_sal_handler) &virt_entry;
-
- IA64_FW_CALL(entry, c->ret,
- c->arg[0], c->arg[1], c->arg[2], c->arg[3],
- c->arg[4], c->arg[5], c->arg[6], c->arg[7]);
-}
-
-static void aml_nfw_read_arg(u8 *offset, u32 bit_width, u64 *value)
-{
- switch (bit_width) {
- case 8:
- *value = *(u8 *)offset;
- break;
- case 16:
- *value = *(u16 *)offset;
- break;
- case 32:
- *value = *(u32 *)offset;
- break;
- case 64:
- *value = *(u64 *)offset;
- break;
- }
-}
-
-static void aml_nfw_write_arg(u8 *offset, u32 bit_width, u64 *value)
-{
- switch (bit_width) {
- case 8:
- *(u8 *) offset = *value;
- break;
- case 16:
- *(u16 *) offset = *value;
- break;
- case 32:
- *(u32 *) offset = *value;
- break;
- case 64:
- *(u64 *) offset = *value;
- break;
- }
-}
-
-static acpi_status aml_nfw_handler(u32 function, acpi_physical_address address,
- u32 bit_width, u64 *value, void *handler_context,
- void *region_context)
-{
- struct ia64_nfw_context *context = handler_context;
- u8 *offset = (u8 *) context + address;
-
- if (bit_width != 8 && bit_width != 16 &&
- bit_width != 32 && bit_width != 64)
- return AE_BAD_PARAMETER;
-
- if (address + (bit_width >> 3) > sizeof(struct ia64_nfw_context))
- return AE_BAD_PARAMETER;
-
- switch (function) {
- case ACPI_READ:
- if (address == offsetof(struct ia64_nfw_context, ret))
- aml_nfw_execute(context);
- aml_nfw_read_arg(offset, bit_width, value);
- break;
- case ACPI_WRITE:
- aml_nfw_write_arg(offset, bit_width, value);
- break;
- }
-
- return AE_OK;
-}
-
-static struct ia64_nfw_context global_context;
-static int global_handler_registered;
-
-static int aml_nfw_add_global_handler(void)
-{
- acpi_status status;
-
- if (global_handler_registered)
- return 0;
-
- status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
- AML_NFW_SPACE, aml_nfw_handler, NULL, &global_context);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- global_handler_registered = 1;
- printk(KERN_INFO "Global 0x%02X opregion handler registered\n",
- AML_NFW_SPACE);
- return 0;
-}
-
-static int aml_nfw_remove_global_handler(void)
-{
- acpi_status status;
-
- if (!global_handler_registered)
- return 0;
-
- status = acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
- AML_NFW_SPACE, aml_nfw_handler);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- global_handler_registered = 0;
- printk(KERN_INFO "Global 0x%02X opregion handler removed\n",
- AML_NFW_SPACE);
- return 0;
-}
-
-static int aml_nfw_add(struct acpi_device *device)
-{
- /*
- * We would normally allocate a new context structure and install
- * the address space handler for the specific device we found.
- * But the HP-UX implementation shares a single global context
- * and always puts the handler at the root, so we'll do the same.
- */
- return aml_nfw_add_global_handler();
-}
-
-static void aml_nfw_remove(struct acpi_device *device)
-{
- aml_nfw_remove_global_handler();
-}
-
-static const struct acpi_device_id aml_nfw_ids[] = {
- {"HPQ5001", 0},
- {"", 0}
-};
-
-static struct acpi_driver acpi_aml_nfw_driver = {
- .name = "native firmware",
- .ids = aml_nfw_ids,
- .ops = {
- .add = aml_nfw_add,
- .remove = aml_nfw_remove,
- },
-};
-
-static int __init aml_nfw_init(void)
-{
- int result;
-
- if (force_register)
- aml_nfw_add_global_handler();
-
- result = acpi_bus_register_driver(&acpi_aml_nfw_driver);
- if (result < 0) {
- aml_nfw_remove_global_handler();
- return result;
- }
-
- return 0;
-}
-
-static void __exit aml_nfw_exit(void)
-{
- acpi_bus_unregister_driver(&acpi_aml_nfw_driver);
- aml_nfw_remove_global_handler();
-}
-
-module_init(aml_nfw_init);
-module_exit(aml_nfw_exit);