LXR linux/drivers/misc/ibmasm/lowlevel.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * IBM ASM Service Processor Device Driver
   4 *
   5 * Copyright (C) IBM Corporation, 2004
   6 *
   7 * Author: Max Asböck <amax@us.ibm.com>
   8 */
   9
  10#include "ibmasm.h"
  11#include "lowlevel.h"
  12#include "i2o.h"
  13#include "dot_command.h"
  14#include "remote.h"
  15
  16static struct i2o_header header = I2O_HEADER_TEMPLATE;
  17
  18
  19int ibmasm_send_i2o_message(struct service_processor *sp)
  20{
  21        u32 mfa;
  22        unsigned int command_size;
  23        struct i2o_message *message;
  24        struct command *command = sp->current_command;
  25
  26        mfa = get_mfa_inbound(sp->base_address);
  27        if (!mfa)
  28                return 1;
  29
  30        command_size = get_dot_command_size(command->buffer);
  31        header.message_size = outgoing_message_size(command_size);
  32
  33        message = get_i2o_message(sp->base_address, mfa);
  34
  35        memcpy_toio(&message->header, &header, sizeof(struct i2o_header));
  36        memcpy_toio(&message->data, command->buffer, command_size);
  37
  38        set_mfa_inbound(sp->base_address, mfa);
  39
  40        return 0;
  41}
  42
  43irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id)
  44{
  45        u32     mfa;
  46        struct service_processor *sp = (struct service_processor *)dev_id;
  47        void __iomem *base_address = sp->base_address;
  48        char tsbuf[32];
  49
  50        if (!sp_interrupt_pending(base_address))
  51                return IRQ_NONE;
  52
  53        dbg("respond to interrupt at %s\n", get_timestamp(tsbuf));
  54
  55        if (mouse_interrupt_pending(sp)) {
  56                ibmasm_handle_mouse_interrupt(sp);
  57                clear_mouse_interrupt(sp);
  58        }
  59
  60        mfa = get_mfa_outbound(base_address);
  61        if (valid_mfa(mfa)) {
  62                struct i2o_message *msg = get_i2o_message(base_address, mfa);
  63                ibmasm_receive_message(sp, &msg->data, incoming_data_size(msg));
  64        } else
  65                dbg("didn't get a valid MFA\n");
  66
  67        set_mfa_outbound(base_address, mfa);
  68        dbg("finished interrupt at   %s\n", get_timestamp(tsbuf));
  69
  70        return IRQ_HANDLED;
  71}
  72