| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: mmiexample.C |
| 4 | // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. |
| 5 | // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. |
| 6 | // |
| 7 | // The above named program is free software; you can redistribute it and/or |
| 8 | // modify it under the terms of the GNU General Public |
| 9 | // License version 2 as published by the Free Software Foundation. |
| 10 | // |
| 11 | // The above named program is distributed in the hope that it will be |
| 12 | // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | // General Public License for more details. |
| 15 | // |
| 16 | // You should have received a copy of the GNU General Public |
| 17 | // License along with this work; if not, write to the Free Software |
| 18 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | // |
| 20 | // ========== Copyright Header End ============================================ |
| 21 | // mmiexample.C |
| 22 | // simple device model that uses the SAM MMI API. |
| 23 | // 2005.05.31 |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <sys/types.h> |
| 27 | |
| 28 | #include "mmi.h" |
| 29 | |
| 30 | extern "C" void mmiexample_instance_creator(const char * modname, const char * instancename); |
| 31 | extern "C" int mmiexample_access(uint32_t cpuid, void* obj, uint64_t paddr, mmi_bool_t wr, uint32_t size, uint64_t* buf, uint8_t bytemask); |
| 32 | |
| 33 | // mmiexample - a simple device that returns monotonically increasing counter values |
| 34 | // store resets the counter |
| 35 | |
| 36 | // "mmiexample" is instantiated using a simple sysconf directive: |
| 37 | // sysconf mmiexample example1 # no arguments |
| 38 | |
| 39 | |
| 40 | struct mmiexample_s { |
| 41 | int counter; |
| 42 | }; // struct mmiexample_s |
| 43 | |
| 44 | |
| 45 | extern "C" void _init() |
| 46 | { |
| 47 | mmi_register_instance_creator("example", mmiexample_instance_creator); |
| 48 | } |
| 49 | |
| 50 | |
| 51 | void mmiexample_instance_creator(const char * modname, const char * instance_name) |
| 52 | { |
| 53 | printf("%s: Instantiating %s\n", modname, instance_name); |
| 54 | |
| 55 | // call mmi_argc() and mmi_argv() here to get device node arguments |
| 56 | |
| 57 | mmiexample_s * instance_data = new mmiexample_s; |
| 58 | instance_data->counter = 0; |
| 59 | |
| 60 | // we currently support only one instance at a hardcoded physical address of 0xdeadbeef0 |
| 61 | mmi_map_physio(0xdeadbeef0, 8, (void *)instance_data, mmiexample_access); |
| 62 | |
| 63 | } // example_instance_creator() |
| 64 | |
| 65 | |
| 66 | |
| 67 | |
| 68 | int mmiexample_access(uint32_t cpuid, void* obj, uint64_t paddr, mmi_bool_t wr, uint32_t size, uint64_t* buf, uint8_t bytemask) |
| 69 | { |
| 70 | mmiexample_s * instance_data = (mmiexample_s *) obj; |
| 71 | |
| 72 | // should check args like paddr, size etc but for now we assume that a uint64_t is passed in *buf |
| 73 | if (wr) { |
| 74 | instance_data->counter = (int) *buf; |
| 75 | return 0; |
| 76 | } else { |
| 77 | *buf = (uint64_t) (++ instance_data->counter); |
| 78 | return 0; |
| 79 | } |
| 80 | } |
| 81 | |