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+/*
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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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+
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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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+
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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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+
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+static int 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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+
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+#define AML_NFW_SPACE 0xA1
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+
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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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+/*
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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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+
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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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+
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+ return __va(address);
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+}
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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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+
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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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+
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+ entry = (ia64_sal_handler) &virt_entry;
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+
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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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+
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+static void aml_nfw_read_arg(u8 *offset, u32 bit_width, acpi_integer *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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+
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+static void aml_nfw_write_arg(u8 *offset, u32 bit_width, acpi_integer *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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+
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+static acpi_status aml_nfw_handler(u32 function, acpi_physical_address address,
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+ u32 bit_width, acpi_integer *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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+
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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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+
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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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+
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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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+
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+ return AE_OK;
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+}
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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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+
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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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+
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+ if (global_handler_registered)
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+ return 0;
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+
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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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+
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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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+
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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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+
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+ if (!global_handler_registered)
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+ return 0;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (force_register)
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+ aml_nfw_add_global_handler();
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+
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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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+
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+ return 0;
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+}
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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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+
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+module_init(aml_nfw_init);
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+module_exit(aml_nfw_exit);
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Linus Torvalds