source: trunk/hal/tsar_mips32/drivers/soclib_bdv.c @ 452

Last change on this file since 452 was 451, checked in by alain, 7 years ago

Fix a bug in soclib_pic driver (bad separation between IOPIC an LAPIC initialisation)
File size: 8.0 KB
Line 
1/*
2 * soclib_bdv.c - soclib simple block device driver implementation.
3 *
4 * Author     Alain Greiner (2016,2017,2018)
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 <soclib_bdv.h>
25#include <hal_kernel_types.h>
26#include <chdev.h>
27#include <dev_ioc.h>
28#include <printk.h>
29#include <thread.h>
30#include <spinlock.h>
31
32///////////////////////////////////////
33void soclib_bdv_init( chdev_t * chdev )
34{
35    // get extended pointer on SOCLIB_BDV peripheral base address
36        xptr_t  bdv_xp = chdev->base;
37
38    // set driver specific fields
39    chdev->cmd = &soclib_bdv_cmd;
40    chdev->isr = &soclib_bdv_isr;
41
42    // get hardware device cluster and local pointer
43    cxy_t      bdv_cxy  = GET_CXY( bdv_xp );
44    uint32_t * bdv_ptr  = (uint32_t *)GET_PTR( bdv_xp );
45
46    // get block_size and block_count 
47        uint32_t block_size = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_BLOCK_SIZE_REG ) );
48        uint32_t block_count = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_SIZE_REG ) );
49
50    // set IOC device descriptor extension
51    chdev->ext.ioc.size  = block_size;
52    chdev->ext.ioc.count = block_count;
53
54} // end soclib_bdv_init()
55
56
57//////////////////////////////////////////////////////////////
58void __attribute__ ((noinline)) soclib_bdv_cmd( xptr_t th_xp )
59{
60    uint32_t   cmd_type;    // IOC_READ / IOC_WRITE / IOC_SYNC_READ
61    uint32_t   lba;
62    uint32_t   count;
63    xptr_t     buf_xp;
64    xptr_t     ioc_xp;
65
66    // get client thread cluster and local pointer
67    cxy_t      th_cxy = GET_CXY( th_xp );
68    thread_t * th_ptr = GET_PTR( th_xp );
69
70    // get command arguments and extended pointer on IOC device
71    cmd_type =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.type   ) );
72    lba      =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.lba    ) );
73    count    =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->ioc_cmd.count  ) );
74    buf_xp   = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->ioc_cmd.buf_xp ) );
75    ioc_xp   = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->ioc_cmd.dev_xp ) );
76
77#if DEBUG_HAL_IOC_RX
78uint32_t cycle = (uint32_t)hal_get_cycles();
79if( (DEBUG_HAL_IOC_RX < cycle) && (cmd_type != IOC_WRITE ) )
80printk("\n[DBG] %s : thread %x enter for RX / cycle %d\n",
81__FUNCTION__ , CURRENT_THREAD , cycle );
82#endif
83
84#if DEBUG_HAL_IOC_TX
85uint32_t cycle = (uint32_t)hal_get_cycles();
86if( (DEBUG_HAL_IOC_TX < cycle) && (cmd_type == IOC_WRITE) )
87printk("\n[DBG] %s : thread %x enter for TX / cycle %d\n",
88__FUNCTION__ , CURRENT_THREAD , cycle );
89#endif
90
91    // get IOC device cluster and local pointer
92    cxy_t      ioc_cxy = GET_CXY( ioc_xp );
93    chdev_t  * ioc_ptr = GET_PTR( ioc_xp );
94
95    // get cluster and pointers for SOCLIB-BDV peripheral segment base
96    xptr_t     seg_xp  = (xptr_t)hal_remote_lwd( XPTR( ioc_cxy , &ioc_ptr->base ) );
97    cxy_t      seg_cxy = GET_CXY( seg_xp );
98    uint32_t * seg_ptr = GET_PTR( seg_xp );
99
100    // split buffer address in two 32 bits words
101    uint32_t   buf_lsb = (uint32_t)(buf_xp);
102    uint32_t   buf_msb = (uint32_t)(buf_xp>>32);
103
104    // set operation
105    uint32_t   op;
106    if( cmd_type == IOC_WRITE ) op = BDV_OP_WRITE; 
107    else                        op = BDV_OP_READ;
108
109    // set SOCLIB_BDV registers to start one I/O operation
110    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_IRQ_ENABLE_REG ) , 1       );
111    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_BUFFER_REG     ) , buf_lsb ); 
112    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_BUFFER_EXT_REG ) , buf_msb ); 
113    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_LBA_REG        ) , lba     );
114    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_COUNT_REG      ) , count   );
115    hal_remote_sw( XPTR( seg_cxy , seg_ptr + BDV_OP_REG         ) , op      );
116
117    // waiting policy  depends on the command type
118    // - for IOC_READ / IOC_WRITE commands, this function is called by the server thread
119    // - for IOC_SYNC_READ command, this function is directly called by the client thread
120
121    if( cmd_type == IOC_SYNC_READ )                   // status polling policy
122    {
123        uint32_t status;
124        while (1)
125        {
126            status = hal_remote_lw( XPTR( seg_cxy , seg_ptr + BDV_STATUS_REG ) );
127
128            if( status == BDV_READ_SUCCESS ) // successfully completed
129            {
130                hal_remote_sw( XPTR( th_cxy , &th_ptr->ioc_cmd.error ) , 0 );
131                break;
132            }
133            else if( status == BDV_BUSY )   // non completed
134            {
135                continue;
136            }
137            else                            // error reported
138            {
139                hal_remote_sw( XPTR( th_cxy , &th_ptr->ioc_cmd.error ) , 1 );
140                break;
141            }
142        }
143    }
144    else                                            // descheduling + IRQ policy
145    { 
146        thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR );
147        sched_yield("blocked on ISR");
148
149        // the IO operation status is reported in the command by the ISR
150    }
151   
152#if DEBUG_HAL_IOC_RX
153cycle = (uint32_t)hal_get_cycles();
154if( (DEBUG_HAL_IOC_RX < cycle) && (cmd_type != TXT_WRITE) )
155printk("\n[DBG] %s : thread %x exit after RX / cycle %d\n",
156__FUNCTION__ , CURRENT_THREAD , cycle );
157#endif
158
159#if DEBUG_HAL_IOC_TX
160cycle = (uint32_t)hal_get_cycles();
161if( (DEBUG_HAL_IOC_TX < cycle) && (cmd_type == TXT_WRITE) )
162printk("\n[DBG] %s : thread %x exit after TX / cycle %d\n",
163__FUNCTION__ , CURRENT_THREAD , cycle );
164#endif
165
166} // end soclib_bdv_cmd()
167
168
169/////////////////////////////////////////////////////////////////
170void __attribute__ ((noinline)) soclib_bdv_isr( chdev_t * chdev )
171{
172    error_t  error = 0;
173
174    // get extended pointer on client thread
175    xptr_t root = XPTR( local_cxy , &chdev->wait_root );
176    xptr_t client_xp = XLIST_FIRST_ELEMENT( root , thread_t , wait_list );
177
178    // get extended pointer on server thread
179    xptr_t server_xp = XPTR( local_cxy , &chdev->server );
180
181    // get client thread cluster and local pointer
182    cxy_t      client_cxy = GET_CXY( client_xp );
183    thread_t * client_ptr = (thread_t *)GET_PTR( client_xp );
184
185    // get command type
186    uint32_t   cmd_type = hal_remote_lw( XPTR( client_cxy , &client_ptr->ioc_cmd.type ) );
187   
188    // get SOCLIB_BDV device cluster and local pointer
189    cxy_t      bdv_cxy  = GET_CXY( chdev->base );
190    uint32_t * bdv_ptr  = (uint32_t *)GET_PTR( chdev->base );
191
192    // get BDV status register and acknowledge IRQ
193        uint32_t status = hal_remote_lw( XPTR( bdv_cxy , bdv_ptr + BDV_STATUS_REG ) );   
194
195    if( cmd_type == IOC_READ )
196    {
197            error = (status != BDV_READ_SUCCESS);
198
199#if DEBUG_HAL_IOC_RX
200uint32_t cycle = (uint32_t)hal_get_cycles();
201if( DEBUG_HAL_IOC_RX < cycle )
202printk("\n[DBG] %s : IOC_IRQ / RX transfer / client %x / server %x / cycle %d\n",
203__FUNCTION__, client_ptr , chdev->server , cycle );
204#endif
205
206    }
207        else if( cmd_type == IOC_WRITE )
208    {
209            error = (status != BDV_WRITE_SUCCESS);
210
211#if DEBUG_HAL_IOC_TX
212uint32_t cycle = (uint32_t)hal_get_cycles();
213if( DEBUG_HAL_IOC_TX < cycle )
214printk("\n[DBG] %s : IOC_IRQ / RX transfer / client %x / server %x / cycle %d\n",
215__FUNCTION__, client_ptr , chdev->server , cycle );
216#endif
217
218    }
219    else
220    {
221        assert( false , __FUNCTION__ , "IOC_SYNC_READ should not use IRQ" );
222    } 
223
224    // set operation status in command
225    hal_remote_sw( XPTR( client_cxy , &client_ptr->ioc_cmd.error ) , error );
226
227    // unblock server thread
228    thread_unblock( server_xp , THREAD_BLOCKED_ISR );
229
230} // end soclib_bdv_isr()
231
232
233
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