1 /*
2 * Bestcomm ATA task driver
3 *
4 *
5 * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
6 * 2003-2004 (c) MontaVista, Software, Inc.
7 *
8 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
9 * Copyright (C) 2006 Freescale - John Rigby
10 *
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of any
13 * kind, whether express or implied.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <asm/io.h>
20
21 #include <linux/fsl/bestcomm/bestcomm.h>
22 #include <linux/fsl/bestcomm/bestcomm_priv.h>
23 #include <linux/fsl/bestcomm/ata.h>
24
25
26 /* ======================================================================== */
27 /* Task image/var/inc */
28 /* ======================================================================== */
29
30 /* ata task image */
31 extern u32 bcom_ata_task[];
32
33 /* ata task vars that need to be set before enabling the task */
34 struct bcom_ata_var {
35 u32 enable; /* (u16*) address of task's control register */
36 u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */
37 u32 bd_last; /* (struct bcom_bd*) end of ring buffer */
38 u32 bd_start; /* (struct bcom_bd*) current bd */
39 u32 buffer_size; /* size of receive buffer */
40 };
41
42 /* ata task incs that need to be set before enabling the task */
43 struct bcom_ata_inc {
44 u16 pad0;
45 s16 incr_bytes;
46 u16 pad1;
47 s16 incr_dst;
48 u16 pad2;
49 s16 incr_src;
50 };
51
52
53 /* ======================================================================== */
54 /* Task support code */
55 /* ======================================================================== */
56
57 struct bcom_task *
bcom_ata_init(int queue_len,int maxbufsize)58 bcom_ata_init(int queue_len, int maxbufsize)
59 {
60 struct bcom_task *tsk;
61 struct bcom_ata_var *var;
62 struct bcom_ata_inc *inc;
63
64 /* Prefetch breaks ATA DMA. Turn it off for ATA DMA */
65 bcom_disable_prefetch();
66
67 tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
68 if (!tsk)
69 return NULL;
70
71 tsk->flags = BCOM_FLAGS_NONE;
72
73 bcom_ata_reset_bd(tsk);
74
75 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
76 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
77
78 if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
79 bcom_task_free(tsk);
80 return NULL;
81 }
82
83 var->enable = bcom_eng->regs_base +
84 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
85 var->bd_base = tsk->bd_pa;
86 var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
87 var->bd_start = tsk->bd_pa;
88 var->buffer_size = maxbufsize;
89
90 /* Configure some stuff */
91 bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
92 bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
93
94 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
95 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
96
97 out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
98
99 return tsk;
100 }
101 EXPORT_SYMBOL_GPL(bcom_ata_init);
102
bcom_ata_rx_prepare(struct bcom_task * tsk)103 void bcom_ata_rx_prepare(struct bcom_task *tsk)
104 {
105 struct bcom_ata_inc *inc;
106
107 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
108
109 inc->incr_bytes = -(s16)sizeof(u32);
110 inc->incr_src = 0;
111 inc->incr_dst = sizeof(u32);
112
113 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
114 }
115 EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
116
bcom_ata_tx_prepare(struct bcom_task * tsk)117 void bcom_ata_tx_prepare(struct bcom_task *tsk)
118 {
119 struct bcom_ata_inc *inc;
120
121 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
122
123 inc->incr_bytes = -(s16)sizeof(u32);
124 inc->incr_src = sizeof(u32);
125 inc->incr_dst = 0;
126
127 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
128 }
129 EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
130
bcom_ata_reset_bd(struct bcom_task * tsk)131 void bcom_ata_reset_bd(struct bcom_task *tsk)
132 {
133 struct bcom_ata_var *var;
134
135 /* Reset all BD */
136 memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
137
138 tsk->index = 0;
139 tsk->outdex = 0;
140
141 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
142 var->bd_start = var->bd_base;
143 }
144 EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
145
bcom_ata_release(struct bcom_task * tsk)146 void bcom_ata_release(struct bcom_task *tsk)
147 {
148 /* Nothing special for the ATA tasks */
149 bcom_task_free(tsk);
150 }
151 EXPORT_SYMBOL_GPL(bcom_ata_release);
152
153
154 MODULE_DESCRIPTION("BestComm ATA task driver");
155 MODULE_AUTHOR("John Rigby");
156 MODULE_LICENSE("GPL v2");
157
158
