![Rusty Russell](/assets/img/avatar_default.png)
module_param(bool) used to counter-intuitively take an int. In
fddd5201
(mid-2009) we allowed bool or int/unsigned int using a messy
trick.
It's time to remove the int/unsigned int option. For this version
it'll simply give a warning, but it'll break next kernel version.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
237 lines
5.5 KiB
C
237 lines
5.5 KiB
C
/*
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* OpRegion handler to allow AML to call native firmware
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*
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* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This driver implements HP Open Source Review Board proposal 1842,
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* which was approved on 9/20/2006.
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*
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* For technical documentation, see the HP SPPA Firmware EAS, Appendix F.
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*
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* ACPI does not define a mechanism for AML methods to call native firmware
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* interfaces such as PAL or SAL. This OpRegion handler adds such a mechanism.
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* After the handler is installed, an AML method can call native firmware by
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* storing the arguments and firmware entry point to specific offsets in the
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* OpRegion. When AML reads the "return value" offset from the OpRegion, this
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* handler loads up the arguments, makes the firmware call, and returns the
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* result.
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*/
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#include <linux/module.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <asm/sal.h>
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MODULE_AUTHOR("Bjorn Helgaas <bjorn.helgaas@hp.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ACPI opregion handler for native firmware calls");
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static bool force_register;
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module_param_named(force, force_register, bool, 0);
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MODULE_PARM_DESC(force, "Install opregion handler even without HPQ5001 device");
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#define AML_NFW_SPACE 0xA1
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struct ia64_pdesc {
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void *ip;
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void *gp;
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};
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/*
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* N.B. The layout of this structure is defined in the HP SPPA FW EAS, and
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* the member offsets are embedded in AML methods.
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*/
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struct ia64_nfw_context {
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u64 arg[8];
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struct ia64_sal_retval ret;
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u64 ip;
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u64 gp;
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u64 pad[2];
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};
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static void *virt_map(u64 address)
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{
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if (address & (1UL << 63))
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return (void *) (__IA64_UNCACHED_OFFSET | address);
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return __va(address);
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}
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static void aml_nfw_execute(struct ia64_nfw_context *c)
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{
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struct ia64_pdesc virt_entry;
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ia64_sal_handler entry;
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virt_entry.ip = virt_map(c->ip);
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virt_entry.gp = virt_map(c->gp);
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entry = (ia64_sal_handler) &virt_entry;
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IA64_FW_CALL(entry, c->ret,
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c->arg[0], c->arg[1], c->arg[2], c->arg[3],
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c->arg[4], c->arg[5], c->arg[6], c->arg[7]);
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}
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static void aml_nfw_read_arg(u8 *offset, u32 bit_width, u64 *value)
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{
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switch (bit_width) {
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case 8:
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*value = *(u8 *)offset;
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break;
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case 16:
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*value = *(u16 *)offset;
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break;
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case 32:
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*value = *(u32 *)offset;
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break;
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case 64:
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*value = *(u64 *)offset;
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break;
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}
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}
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static void aml_nfw_write_arg(u8 *offset, u32 bit_width, u64 *value)
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{
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switch (bit_width) {
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case 8:
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*(u8 *) offset = *value;
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break;
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case 16:
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*(u16 *) offset = *value;
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break;
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case 32:
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*(u32 *) offset = *value;
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break;
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case 64:
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*(u64 *) offset = *value;
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break;
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}
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}
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static acpi_status aml_nfw_handler(u32 function, acpi_physical_address address,
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u32 bit_width, u64 *value, void *handler_context,
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void *region_context)
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{
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struct ia64_nfw_context *context = handler_context;
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u8 *offset = (u8 *) context + address;
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if (bit_width != 8 && bit_width != 16 &&
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bit_width != 32 && bit_width != 64)
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return AE_BAD_PARAMETER;
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if (address + (bit_width >> 3) > sizeof(struct ia64_nfw_context))
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return AE_BAD_PARAMETER;
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switch (function) {
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case ACPI_READ:
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if (address == offsetof(struct ia64_nfw_context, ret))
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aml_nfw_execute(context);
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aml_nfw_read_arg(offset, bit_width, value);
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break;
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case ACPI_WRITE:
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aml_nfw_write_arg(offset, bit_width, value);
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break;
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}
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return AE_OK;
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}
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static struct ia64_nfw_context global_context;
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static int global_handler_registered;
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static int aml_nfw_add_global_handler(void)
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{
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acpi_status status;
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if (global_handler_registered)
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return 0;
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status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
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AML_NFW_SPACE, aml_nfw_handler, NULL, &global_context);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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global_handler_registered = 1;
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printk(KERN_INFO "Global 0x%02X opregion handler registered\n",
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AML_NFW_SPACE);
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return 0;
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}
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static int aml_nfw_remove_global_handler(void)
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{
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acpi_status status;
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if (!global_handler_registered)
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return 0;
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status = acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
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AML_NFW_SPACE, aml_nfw_handler);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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global_handler_registered = 0;
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printk(KERN_INFO "Global 0x%02X opregion handler removed\n",
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AML_NFW_SPACE);
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return 0;
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}
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static int aml_nfw_add(struct acpi_device *device)
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{
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/*
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* We would normally allocate a new context structure and install
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* the address space handler for the specific device we found.
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* But the HP-UX implementation shares a single global context
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* and always puts the handler at the root, so we'll do the same.
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*/
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return aml_nfw_add_global_handler();
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}
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static int aml_nfw_remove(struct acpi_device *device, int type)
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{
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return aml_nfw_remove_global_handler();
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}
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static const struct acpi_device_id aml_nfw_ids[] = {
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{"HPQ5001", 0},
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{"", 0}
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};
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static struct acpi_driver acpi_aml_nfw_driver = {
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.name = "native firmware",
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.ids = aml_nfw_ids,
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.ops = {
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.add = aml_nfw_add,
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.remove = aml_nfw_remove,
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},
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};
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static int __init aml_nfw_init(void)
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{
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int result;
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if (force_register)
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aml_nfw_add_global_handler();
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result = acpi_bus_register_driver(&acpi_aml_nfw_driver);
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if (result < 0) {
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aml_nfw_remove_global_handler();
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return result;
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}
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return 0;
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}
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static void __exit aml_nfw_exit(void)
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{
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acpi_bus_unregister_driver(&acpi_aml_nfw_driver);
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aml_nfw_remove_global_handler();
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}
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module_init(aml_nfw_init);
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module_exit(aml_nfw_exit);
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