source: trunk/hal/tsar_mips32/drivers/soclib_bdv.c @ 251

Last change on this file since 251 was 211, checked in by max@…, 7 years ago

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1/*
2 * soclib_bdv.c - soclib simple block device driver implementation.
3 *
4 * Author     Alain Greiner (2016)
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#include <chdev.h>
25#include <dev_ioc.h>
26#include <soclib_bdv.h>
27#include <thread.h>
28#include <spinlock.h>
29
30
31///////////////////////////////////////
32void soclib_bdv_init( chdev_t * chdev )
33{
34    // get extended pointer on SOCLIB_BDV peripheral base address
35        xptr_t  bdv_xp = chdev->base;
36
37    // set driver specific fields
38    chdev->cmd = &soclib_bdv_cmd;
39    chdev->isr = &soclib_bdv_isr;
40
41    // get hardware device cluster and local pointer
42    cxy_t      bdv_cxy  = GET_CXY( bdv_xp );
43    uint32_t * bdv_ptr  = (uint32_t *)GET_PTR( bdv_xp );
44
45    // get block_size and block_count 
46        uint32_t block_size = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_BLOCK_SIZE_REG ) );
47        uint32_t block_count = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_SIZE_REG ) );
48
49    // set IOC device descriptor extension
50    chdev->ext.ioc.size  = block_size;
51    chdev->ext.ioc.count = block_count;
52
53} // end soclib_bdv_init()
54
55
56//////////////////////////////////////////////////////////////
57void __attribute__ ((noinline)) soclib_bdv_cmd( xptr_t th_xp )
58{
59    uint32_t   cmd_type;     // IOC_READ / IOC_WRITE / IOC_SYNC_READ
60    uint32_t   lba;          // command argument
61    uint32_t   count;        // command argument
62    xptr_t     buf_xp;       // command argument
63    xptr_t     dev_xp;       // command argument
64
65    // get client thread cluster and local pointer
66    cxy_t      th_cxy = GET_CXY( th_xp );
67    thread_t * th_ptr = (thread_t *)GET_PTR( th_xp );
68
69    // get command arguments and extended pointer on IOC device
70    cmd_type =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.type   ) );
71    lba      =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.lba    ) );
72    count    =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.count  ) );
73    buf_xp   = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.ioc.buf_xp ) );
74    dev_xp   = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.ioc.dev_xp ) );
75
76    // get IOC device cluster and local pointer
77    cxy_t      dev_cxy = GET_CXY( dev_xp );
78    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
79
80    // get extended pointer on SOCLIB-BDV peripheral
81    xptr_t     bdv_xp = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->base ) );
82
83    // get SOCLIB_BDV device cluster and local pointer
84    cxy_t      bdv_cxy = GET_CXY( bdv_xp );
85    uint32_t * bdv_ptr = (uint32_t *)GET_PTR( bdv_xp );
86
87    // split buffer address in two 32 bits words
88    uint32_t   buf_lsb = (uint32_t)(buf_xp);
89    uint32_t   buf_msb = (uint32_t)(buf_xp>>32);
90
91    // set operation
92    uint32_t   op;
93    if( cmd_type == IOC_WRITE ) op = BDV_OP_WRITE; 
94    else                        op = BDV_OP_READ;
95
96    // set SOCLIB_BDV registers to start one I/O operation
97    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_IRQ_ENABLE_REG ) , 1       );
98    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_BUFFER_REG     ) , buf_lsb ); 
99    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_BUFFER_EXT_REG ) , buf_msb ); 
100    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_LBA_REG        ) , lba     );
101    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_COUNT_REG      ) , count   );
102    hal_remote_sw( XPTR( bdv_cxy , bdv_ptr + BDV_OP_REG         ) , op      );
103
104    // waiting policy  depends on the command type
105
106    if( cmd_type == IOC_SYNC_READ )                  // polling policy
107    {
108        uint32_t status;
109        while (1)
110        {
111            status = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_STATUS_REG ) );
112
113            if( status == BDV_READ_SUCCESS ) // successfully completed
114            {
115                hal_remote_sw( XPTR( th_cxy , &th_ptr->command.ioc.error ) , 0 );
116                break;
117            }
118            else if( status == BDV_BUSY )   // non completed
119            {
120                continue;
121            }
122            else                            // error reported
123            {
124                hal_remote_sw( XPTR( th_cxy , &th_ptr->command.ioc.error ) , 1 );
125                break;
126            }
127        }
128    }
129    else                                            // descheduling + IRQ policy
130    { 
131        thread_block( CURRENT_THREAD , THREAD_BLOCKED_DEV_ISR );
132        sched_yield();
133    }
134   
135} // end soclib_bdv_cmd()
136
137
138/////////////////////////////////////////////////////////////////
139void __attribute__ ((noinline)) soclib_bdv_isr( chdev_t * chdev )
140{
141    // get extended pointer on client thread
142    xptr_t root = XPTR( local_cxy , &chdev->wait_root );
143    xptr_t client_xp = XLIST_FIRST_ELEMENT( root , thread_t , wait_list );
144
145    // get extended pointer on server thread
146    xptr_t server_xp = XPTR( local_cxy , &chdev->server );
147
148    // get client thread cluster and local pointer
149    cxy_t      client_cxy = GET_CXY( client_xp );
150    thread_t * client_ptr = (thread_t *)GET_PTR( client_xp );
151
152    // get SOCLIB_BDV device cluster and local pointer
153    cxy_t      bdv_cxy  = GET_CXY( chdev->base );
154    uint32_t * bdv_ptr  = (uint32_t *)GET_PTR( chdev->base );
155
156    // get BDV status register and acknowledge IRQ
157        uint32_t status = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_STATUS_REG ) );   
158
159    // set operation status in command
160        if((status != BDV_READ_SUCCESS) && (status != BDV_WRITE_SUCCESS)) 
161    {
162        hal_remote_sw( XPTR( client_cxy , &client_ptr->command.ioc.error ) , 1 );
163    }
164        else
165    {
166        hal_remote_sw( XPTR( client_cxy , &client_ptr->command.ioc.error ) , 0 );
167    }
168
169    // unblock server thread
170    thread_unblock( server_xp , THREAD_BLOCKED_DEV_ISR );
171
172    // unblock client thread
173    thread_unblock( client_xp , THREAD_BLOCKED_IO );
174
175} // end soclib_bdv_isr()
176
177
178
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