| 1 | /* |
|---|
| 2 | * soclib_bdv.h - SOCLIB_BDV (simple block device) driver definition. |
|---|
| 3 | * |
|---|
| 4 | * Author Alain Greiner |
|---|
| 5 | * |
|---|
| 6 | * Copyright (c) UPMC Sorbonne Universites |
|---|
| 7 | * |
|---|
| 8 | * This file is part of ALMOS-MKH. |
|---|
| 9 | * |
|---|
| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
|---|
| 11 | * under the terms of the GNU General Public License as published by |
|---|
| 12 | * the Free Software Foundation; version 2.0 of the License. |
|---|
| 13 | * |
|---|
| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
|---|
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 17 | * General Public License for more details. |
|---|
| 18 | * |
|---|
| 19 | * You should have received a copy of the GNU General Public License |
|---|
| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
|---|
| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|---|
| 22 | */ |
|---|
| 23 | |
|---|
| 24 | #ifndef _SOCLIB_BDV_H_ |
|---|
| 25 | #define _SOCLIB_BDV_H_ |
|---|
| 26 | |
|---|
| 27 | #include <device.h> |
|---|
| 28 | #include <hal_types.h> |
|---|
| 29 | |
|---|
| 30 | /******************************************************************************************** |
|---|
| 31 | * This driver supports the SocLib VciBlockDevice component, that is a simgle channel, |
|---|
| 32 | * block oriented, external storage controler, supporting only one I/O transaction, |
|---|
| 33 | * at a given time. |
|---|
| 34 | *******************************************************************************************/ |
|---|
| 35 | |
|---|
| 36 | /******************************************************************************************** |
|---|
| 37 | * SOCLIB_BDV registers offset |
|---|
| 38 | *******************************************************************************************/ |
|---|
| 39 | |
|---|
| 40 | enum SoclibBlockDeviceRegisters |
|---|
| 41 | { |
|---|
| 42 | BDV_BUFFER_REG = 0, |
|---|
| 43 | BDV_LBA_REG = 1, |
|---|
| 44 | BDV_COUNT_REG = 2, |
|---|
| 45 | BDV_OP_REG = 3, |
|---|
| 46 | BDV_STATUS_REG = 4, |
|---|
| 47 | BDV_IRQ_ENABLE_REG = 5, |
|---|
| 48 | BDV_SIZE_REG = 6, |
|---|
| 49 | BDV_BLOCK_SIZE_REG = 7, |
|---|
| 50 | BDV_BUFFER_EXT_REG = 8, |
|---|
| 51 | }; |
|---|
| 52 | |
|---|
| 53 | /******************************************************************************************** |
|---|
| 54 | * SOCLIB_BDV status values |
|---|
| 55 | *******************************************************************************************/ |
|---|
| 56 | |
|---|
| 57 | #define BDV_IDLE 0 |
|---|
| 58 | #define BDV_BUSY 1 |
|---|
| 59 | #define BDV_READ_SUCCESS 2 |
|---|
| 60 | #define BDV_WRITE_SUCCESS 3 |
|---|
| 61 | #define BDV_READ_ERROR 4 |
|---|
| 62 | #define BDV_WRITE_ERROR 5 |
|---|
| 63 | #define BDV_ERROR 6 |
|---|
| 64 | |
|---|
| 65 | /******************************************************************************************** |
|---|
| 66 | * SOCLIB_BDV operations |
|---|
| 67 | *******************************************************************************************/ |
|---|
| 68 | |
|---|
| 69 | #define BDV_OP_NOP 0 |
|---|
| 70 | #define BDV_OP_READ 1 |
|---|
| 71 | #define BDV_OP_WRITE 2 |
|---|
| 72 | |
|---|
| 73 | /******************************************************************************************** |
|---|
| 74 | * This function access the SOCLIB_BDV hardware registers to get the block size and the |
|---|
| 75 | * number of blocks, and initialises the "extension" field of the IOC device descriptor. |
|---|
| 76 | ******************************************************************************************** |
|---|
| 77 | * @ dev_xp : extended pointer on the generic IOC device descriptor. |
|---|
| 78 | *******************************************************************************************/ |
|---|
| 79 | extern void soclib_bdv_init( xptr_t dev_xp ); |
|---|
| 80 | |
|---|
| 81 | /******************************************************************************************** |
|---|
| 82 | * This function is called by the server thread associated to the IOC device. |
|---|
| 83 | * It decode the IOC device command embedded in the calling thread descriptor, |
|---|
| 84 | * (format defined in the dev_ioc.h file) and starts execution of this generic command, |
|---|
| 85 | * accessing the relevant SOCLIB_BDV hardware registers. |
|---|
| 86 | * Then it blocks on the THREAD_BLOCKED_DEV_ISR and deschedule, because the SOCLIB_BDV |
|---|
| 87 | * device cannot register several commands. It is re-activated by the ISR signaling the |
|---|
| 88 | * I/O operation completion. |
|---|
| 89 | ******************************************************************************************** |
|---|
| 90 | * @ thread_xp : extended pointer on the client thread. |
|---|
| 91 | *******************************************************************************************/ |
|---|
| 92 | extern void soclib_bdv_command( xptr_t thread_xp ); |
|---|
| 93 | |
|---|
| 94 | /******************************************************************************************** |
|---|
| 95 | * This Interrupt Service Routine is executed when the IRQ signaling the completion of |
|---|
| 96 | * an IOC command is received by a core. It acknowledge the IRQ by accessing the proper |
|---|
| 97 | * SOCLIB_BDV register, unblock the client thread, and unblock the server thread that |
|---|
| 98 | * can starts execution of a new command if the waiting queue is not emppty. |
|---|
| 99 | ******************************************************************************************** |
|---|
| 100 | * @ dev : local pointer on the generic IOC device descriptor. |
|---|
| 101 | *******************************************************************************************/ |
|---|
| 102 | extern void soclib_bdv_isr( device_t * dev ); |
|---|
| 103 | |
|---|
| 104 | |
|---|
| 105 | #endif /* _BLOCK_H_ */ |
|---|
