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
  16 static struct i2o_header header = I2O_HEADER_TEMPLATE;
  17
  18
  19 int 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
  43 irqreturn_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 }