source: trunk/kernel/drivers/soclib/soclib_hba.h @ 8

Last change on this file since 8 was 4, checked in by alain, 8 years ago

Introduce the chdev_t structure in place of device_t.
File size: 7.5 KB
Line 
1/*
2 * soclib_hba.h - soclib AHCI block device driver definition.
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#ifndef _SOCLIB_HBA_H_
25#define _SOCLIB_HBA_H_
26
27#include <chdev.h>
28#include <hal_types.h>
29
30/*****************************************************************************************
31 * This driver supports the SocLib VciMultiAhci component, that is a multi-channels,
32 * block oriented, external storage controler, respecting the AHCI standard.
33 *
34 * 1. Each HBA channel define an independant physical disk, but this driver
35 *    supports only channel 0, because ALMOS-MKH uses only one physical disk.
36 *
37 * 2. The SOCLIB HBA component support split memory buffers (several physical
38 *    buffers for one single command), but this driver supports only one
39 *    single buffer I/O operation.
40 *
41 * 3. The "command list" can register up to 32 independant commands, posted
42 *    by different user threads. The command list is filled by the server
43 *    thread associated to the device, using one free slot per command, until the
44 *    device waiting queue of client threads is empty.
45 *
46 * 4. As there is only one interrupt, and the registered I/O operation can complete
47 *    in any order, this interrupt is not linked to a specific I/O operation.
48 *    The associated HBA_ISR unblock all client threads that have a completed command,
49 *    using the "hba_active_slots" and "hba_owner_thread[32]" global variables.
50 ****************************************************************************************/
51
52/*****************************************************************************************
53 * HBA component registers offsets
54 ****************************************************************************************/
55
56enum SoclibMultiAhciRegisters
57{
58  HBA_PXCLB_REG        = 0,         // command list base address 32 LSB bits
59  HBA_PXCLBU_REG       = 1,         // command list base address 32 MSB bits
60  HBA_PXIS_REG         = 4,         // interrupt status
61  HBA_PXIE_REG         = 5,         // interrupt enable
62  HBA_PXCMD_REG        = 6,         // run
63  HBA_BLOCK_SIZE_REG   = 7,         // number of bytes per block
64  HBA_BLOCK_COUNT_REG  = 8,         // number of blocks
65  HBA_PXCI_REG         = 14,        // command bit-vector     
66
67};
68
69/*****************************************************************************************
70 * This structure defines the command header  (16 bytes)
71 ****************************************************************************************/
72
73typedef struct hba_cmd_header_s 
74{
75    unsigned int        res0;       // reserved
76    unsigned char           lba0;           // LBA 7:0
77    unsigned char           lba1;           // LBA 15:8
78    unsigned char           lba2;           // LBA 23:16
79    unsigned char           res1;           // reserved
80    unsigned char           lba3;           // LBA 31:24
81    unsigned char           lba4;           // LBA 39:32
82    unsigned char           lba5;           // LBA 47:40
83    unsigned char           res2;           // reserved
84    unsigned int        res3;       // reserved
85
86} 
87hba_cmd_header_t;
88
89/*****************************************************************************************
90 * This structure defines the command buffer  (16 bytes)
91 ****************************************************************************************/
92
93typedef struct hba_cmd_buffer_s
94{
95    unsigned int        dba;        // Buffer base address 32 LSB bits
96    unsigned int        dbau;       // Buffer base address 32 MSB bits
97    unsigned int        res0;       // reserved
98    unsigned int        dbc;        // Buffer byte count
99} 
100hba_cmd_buffer_t;
101
102/*****************************************************************************************
103 * This structure defines a command table  (32 bytes, because we support only one buffer)
104 ****************************************************************************************/
105
106typedef struct hba_cmd_table_s
107{
108    hba_cmd_header_t   header;      // contains LBA
109    hba_cmd_buffer_t   buffer;      // only one physical buffer
110}
111hba_cmd_table_t;
112
113/*****************************************************************************************
114 * This structure defines a command descriptor  (16 bytes)
115 ****************************************************************************************/
116
117typedef struct hba_cmd_desc_s
118{
119    unsigned char       flag[2];    // W in bit 6 of flag[0]
120    unsigned char       prdtl[2];       // Number of buffers
121    unsigned int        prdbc;          // Number of bytes actually transfered
122    unsigned int        ctba;           // Command Table base address 32 LSB bits
123    unsigned int        ctbau;          // Command Table base address 32 MSB bits
124}
125hba_cmd_desc_t;
126
127/********************************************************************************************
128 * This function access the SOCLIB_HBA hardware registers to get the block size and the
129 * number of blocks, and initialises the "extension" field of the IOC device descriptor.
130 ********************************************************************************************
131 * @ chdev     : local pointer on the generic IOC chdev descriptor.
132 *******************************************************************************************/
133extern void soclib_hba_init( chdev_t * chdev );
134
135/********************************************************************************************
136 * This function is called by the server thread associated to the IOC device.
137 * It decodes the IOC device command embedded in the calling thread descriptor,
138 * (format defined in the dev_ioc.h file) and starts execution of this generic command,
139 * accessing the relevant SOCLIB_HBA hardware registers.
140 * It registers the command in the SOCLIB_HBA device and returns without blocking
141 * because this AHCI component supports up to 32 concurrent I/O operations.
142 * It simply deschedules without blocking if the number of registered I/O operations
143 * becomes larger than 32, which should be a rare event.
144 ********************************************************************************************
145 * @ xp_thread  : extended pointer on the client thread.
146 *******************************************************************************************/
147extern void soclib_hba_command( xptr_t  thread_xp );
148
149/********************************************************************************************
150 * This Interrupt Service Routine is executed when the IRQ signaling the completion of
151 * one or several I/O operations registered in the SOCLIB_AHCI device is received.
152 * It acknowledges the IRQ by accessing the proper SOCLIB_HBA register, and unblock
153 * all client thread that have an I/O operation completed.
154 ********************************************************************************************
155 * @ chdev     : local pointer on the generic IOC device descriptor.
156 *******************************************************************************************/
157extern void soclib_hba_isr( chdev_t * chdev );
158
159
160#endif /* _SOCLIB_HBA_H_ */
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