957a988d23ea914ef51148782034e902cf0b0c62
[linux-3.10.git] / arch / powerpc / sysdev / bestcomm / fec.c
1 /*
2  * Bestcomm FEC tasks driver
3  *
4  *
5  * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
6  * Copyright (C) 2003-2004 MontaVista, Software, Inc.
7  *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
8  *
9  * This file is licensed under the terms of the GNU General Public License
10  * version 2. This program is licensed "as is" without any warranty of any
11  * kind, whether express or implied.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <asm/io.h>
18
19 #include "bestcomm.h"
20 #include "bestcomm_priv.h"
21 #include "fec.h"
22
23
24 /* ======================================================================== */
25 /* Task image/var/inc                                                       */
26 /* ======================================================================== */
27
28 /* fec tasks images */
29 extern u32 bcom_fec_rx_task[];
30 extern u32 bcom_fec_tx_task[];
31
32 /* rx task vars that need to be set before enabling the task */
33 struct bcom_fec_rx_var {
34         u32 enable;             /* (u16*) address of task's control register */
35         u32 fifo;               /* (u32*) address of fec's fifo */
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 /* rx task incs that need to be set before enabling the task */
43 struct bcom_fec_rx_inc {
44         u16 pad0;
45         s16 incr_bytes;
46         u16 pad1;
47         s16 incr_dst;
48         u16 pad2;
49         s16 incr_dst_ma;
50 };
51
52 /* tx task vars that need to be set before enabling the task */
53 struct bcom_fec_tx_var {
54         u32 DRD;                /* (u32*) address of self-modified DRD */
55         u32 fifo;               /* (u32*) address of fec's fifo */
56         u32 enable;             /* (u16*) address of task's control register */
57         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
58         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
59         u32 bd_start;           /* (struct bcom_bd*) current bd */
60         u32 buffer_size;        /* set by uCode for each packet */
61 };
62
63 /* tx task incs that need to be set before enabling the task */
64 struct bcom_fec_tx_inc {
65         u16 pad0;
66         s16 incr_bytes;
67         u16 pad1;
68         s16 incr_src;
69         u16 pad2;
70         s16 incr_src_ma;
71 };
72
73 /* private structure in the task */
74 struct bcom_fec_priv {
75         phys_addr_t     fifo;
76         int             maxbufsize;
77 };
78
79
80 /* ======================================================================== */
81 /* Task support code                                                        */
82 /* ======================================================================== */
83
84 struct bcom_task *
85 bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
86 {
87         struct bcom_task *tsk;
88         struct bcom_fec_priv *priv;
89
90         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
91                                 sizeof(struct bcom_fec_priv));
92         if (!tsk)
93                 return NULL;
94
95         tsk->flags = BCOM_FLAGS_NONE;
96
97         priv = tsk->priv;
98         priv->fifo = fifo;
99         priv->maxbufsize = maxbufsize;
100
101         if (bcom_fec_rx_reset(tsk)) {
102                 bcom_task_free(tsk);
103                 return NULL;
104         }
105
106         return tsk;
107 }
108 EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
109
110 int
111 bcom_fec_rx_reset(struct bcom_task *tsk)
112 {
113         struct bcom_fec_priv *priv = tsk->priv;
114         struct bcom_fec_rx_var *var;
115         struct bcom_fec_rx_inc *inc;
116
117         /* Shutdown the task */
118         bcom_disable_task(tsk->tasknum);
119
120         /* Reset the microcode */
121         var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
122         inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);
123
124         if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
125                 return -1;
126
127         var->enable     = bcom_eng->regs_base +
128                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
129         var->fifo       = (u32) priv->fifo;
130         var->bd_base    = tsk->bd_pa;
131         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
132         var->bd_start   = tsk->bd_pa;
133         var->buffer_size = priv->maxbufsize;
134
135         inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
136         inc->incr_dst   = sizeof(u32);          /* task image, but we stick */
137         inc->incr_dst_ma= sizeof(u8);           /* to the official ones     */
138
139         /* Reset the BDs */
140         tsk->index = 0;
141         tsk->outdex = 0;
142
143         memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
144
145         /* Configure some stuff */
146         bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
147         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
148
149         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
150
151         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
152
153         return 0;
154 }
155 EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
156
157 void
158 bcom_fec_rx_release(struct bcom_task *tsk)
159 {
160         /* Nothing special for the FEC tasks */
161         bcom_task_free(tsk);
162 }
163 EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
164
165
166
167         /* Return 2nd to last DRD */
168         /* This is an ugly hack, but at least it's only done
169            once at initialization */
170 static u32 *self_modified_drd(int tasknum)
171 {
172         u32 *desc;
173         int num_descs;
174         int drd_count;
175         int i;
176
177         num_descs = bcom_task_num_descs(tasknum);
178         desc = bcom_task_desc(tasknum) + num_descs - 1;
179         drd_count = 0;
180         for (i=0; i<num_descs; i++, desc--)
181                 if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
182                         break;
183         return desc;
184 }
185
186 struct bcom_task *
187 bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
188 {
189         struct bcom_task *tsk;
190         struct bcom_fec_priv *priv;
191
192         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
193                                 sizeof(struct bcom_fec_priv));
194         if (!tsk)
195                 return NULL;
196
197         tsk->flags = BCOM_FLAGS_ENABLE_TASK;
198
199         priv = tsk->priv;
200         priv->fifo = fifo;
201
202         if (bcom_fec_tx_reset(tsk)) {
203                 bcom_task_free(tsk);
204                 return NULL;
205         }
206
207         return tsk;
208 }
209 EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
210
211 int
212 bcom_fec_tx_reset(struct bcom_task *tsk)
213 {
214         struct bcom_fec_priv *priv = tsk->priv;
215         struct bcom_fec_tx_var *var;
216         struct bcom_fec_tx_inc *inc;
217
218         /* Shutdown the task */
219         bcom_disable_task(tsk->tasknum);
220
221         /* Reset the microcode */
222         var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
223         inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);
224
225         if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
226                 return -1;
227
228         var->enable     = bcom_eng->regs_base +
229                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
230         var->fifo       = (u32) priv->fifo;
231         var->DRD        = bcom_sram_va2pa(self_modified_drd(tsk->tasknum));
232         var->bd_base    = tsk->bd_pa;
233         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
234         var->bd_start   = tsk->bd_pa;
235
236         inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
237         inc->incr_src   = sizeof(u32);          /* task image, but we stick */
238         inc->incr_src_ma= sizeof(u8);           /* to the official ones     */
239
240         /* Reset the BDs */
241         tsk->index = 0;
242         tsk->outdex = 0;
243
244         memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
245
246         /* Configure some stuff */
247         bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
248         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
249
250         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
251
252         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
253
254         return 0;
255 }
256 EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
257
258 void
259 bcom_fec_tx_release(struct bcom_task *tsk)
260 {
261         /* Nothing special for the FEC tasks */
262         bcom_task_free(tsk);
263 }
264 EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
265
266
267 MODULE_DESCRIPTION("BestComm FEC tasks driver");
268 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
269 MODULE_LICENSE("GPL v2");
270