drivers/misc/ibmasm/lowlevel.c

   1 /*
   2  * IBM ASM Service Processor Device Driver
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright (C) IBM Corporation, 2004
  19  *
  20  * Author: Max Asböck <amax@us.ibm.com>
  21  *
  22  */
  23
  24 #include "ibmasm.h"
  25 #include "lowlevel.h"
  26 #include "i2o.h"
  27 #include "dot_command.h"
  28 #include "remote.h"
  29
  30 static struct i2o_header header = I2O_HEADER_TEMPLATE;
  31
  32
  33 int ibmasm_send_i2o_message(struct service_processor *sp)
  34 {
  35         u32 mfa;
  36         unsigned int command_size;
  37         struct i2o_message *message;
  38         struct command *command = sp->current_command;
  39
  40         mfa = get_mfa_inbound(sp->base_address);
  41         if (!mfa)
  42                 return 1;
  43
  44         command_size = get_dot_command_size(command->buffer);
  45         header.message_size = outgoing_message_size(command_size);
  46
  47         message = get_i2o_message(sp->base_address, mfa);
  48
  49         memcpy_toio(&message->header, &header, sizeof(struct i2o_header));
  50         memcpy_toio(&message->data, command->buffer, command_size);
  51
  52         set_mfa_inbound(sp->base_address, mfa);
  53
  54         return 0;
  55 }
  56
  57 irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id, struct pt_regs *regs)
  58 {
  59         u32     mfa;
  60         struct service_processor *sp = (struct service_processor *)dev_id;
  61         void __iomem *base_address = sp->base_address;
  62         char tsbuf[32];
  63
  64         if (!sp_interrupt_pending(base_address))
  65                 return IRQ_NONE;
  66
  67         dbg("respond to interrupt at %s\n", get_timestamp(tsbuf));
  68
  69         if (mouse_interrupt_pending(sp)) {
  70                 ibmasm_handle_mouse_interrupt(sp, regs);
  71                 clear_mouse_interrupt(sp);
  72         }
  73
  74         mfa = get_mfa_outbound(base_address);
  75         if (valid_mfa(mfa)) {
  76                 struct i2o_message *msg = get_i2o_message(base_address, mfa);
  77                 ibmasm_receive_message(sp, &msg->data, incoming_data_size(msg));
  78         } else
  79                 dbg("didn't get a valid MFA\n");
  80
  81         set_mfa_outbound(base_address, mfa);
  82         dbg("finished interrupt at   %s\n", get_timestamp(tsbuf));
  83
  84         return IRQ_HANDLED;
  85 }