atmel_serial: fix bugs in probe() error path and remove()
[pv_ops_mirror.git] / arch / powerpc / sysdev / bestcomm / fec.c
blob957a988d23ea914ef51148782034e902cf0b0c62
1 /*
2 * Bestcomm FEC tasks driver
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> )
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.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <asm/io.h>
19 #include "bestcomm.h"
20 #include "bestcomm_priv.h"
21 #include "fec.h"
24 /* ======================================================================== */
25 /* Task image/var/inc */
26 /* ======================================================================== */
28 /* fec tasks images */
29 extern u32 bcom_fec_rx_task[];
30 extern u32 bcom_fec_tx_task[];
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 */
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;
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 */
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;
73 /* private structure in the task */
74 struct bcom_fec_priv {
75 phys_addr_t fifo;
76 int maxbufsize;
80 /* ======================================================================== */
81 /* Task support code */
82 /* ======================================================================== */
84 struct bcom_task *
85 bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
87 struct bcom_task *tsk;
88 struct bcom_fec_priv *priv;
90 tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
91 sizeof(struct bcom_fec_priv));
92 if (!tsk)
93 return NULL;
95 tsk->flags = BCOM_FLAGS_NONE;
97 priv = tsk->priv;
98 priv->fifo = fifo;
99 priv->maxbufsize = maxbufsize;
101 if (bcom_fec_rx_reset(tsk)) {
102 bcom_task_free(tsk);
103 return NULL;
106 return tsk;
108 EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
111 bcom_fec_rx_reset(struct bcom_task *tsk)
113 struct bcom_fec_priv *priv = tsk->priv;
114 struct bcom_fec_rx_var *var;
115 struct bcom_fec_rx_inc *inc;
117 /* Shutdown the task */
118 bcom_disable_task(tsk->tasknum);
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);
124 if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
125 return -1;
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;
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 */
139 /* Reset the BDs */
140 tsk->index = 0;
141 tsk->outdex = 0;
143 memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
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);
149 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
151 out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
153 return 0;
155 EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
157 void
158 bcom_fec_rx_release(struct bcom_task *tsk)
160 /* Nothing special for the FEC tasks */
161 bcom_task_free(tsk);
163 EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
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)
172 u32 *desc;
173 int num_descs;
174 int drd_count;
175 int i;
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;
186 struct bcom_task *
187 bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
189 struct bcom_task *tsk;
190 struct bcom_fec_priv *priv;
192 tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
193 sizeof(struct bcom_fec_priv));
194 if (!tsk)
195 return NULL;
197 tsk->flags = BCOM_FLAGS_ENABLE_TASK;
199 priv = tsk->priv;
200 priv->fifo = fifo;
202 if (bcom_fec_tx_reset(tsk)) {
203 bcom_task_free(tsk);
204 return NULL;
207 return tsk;
209 EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
212 bcom_fec_tx_reset(struct bcom_task *tsk)
214 struct bcom_fec_priv *priv = tsk->priv;
215 struct bcom_fec_tx_var *var;
216 struct bcom_fec_tx_inc *inc;
218 /* Shutdown the task */
219 bcom_disable_task(tsk->tasknum);
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);
225 if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
226 return -1;
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;
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 */
240 /* Reset the BDs */
241 tsk->index = 0;
242 tsk->outdex = 0;
244 memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
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);
250 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
252 out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
254 return 0;
256 EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
258 void
259 bcom_fec_tx_release(struct bcom_task *tsk)
261 /* Nothing special for the FEC tasks */
262 bcom_task_free(tsk);
264 EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
267 MODULE_DESCRIPTION("BestComm FEC tasks driver");
268 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
269 MODULE_LICENSE("GPL v2");