Merge branch 'core/percpu' into stackprotector
[linux-2.6] / arch / powerpc / sysdev / qe_lib / ucc_slow.c
1 /*
2  * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
3  *
4  * Authors:     Shlomi Gridish <gridish@freescale.com>
5  *              Li Yang <leoli@freescale.com>
6  *
7  * Description:
8  * QE UCC Slow API Set - UCC Slow specific routines implementations.
9  *
10  * This program is free software; you can redistribute  it and/or modify it
11  * under  the terms of  the GNU General  Public License as published by the
12  * Free Software Foundation;  either version 2 of the  License, or (at your
13  * option) any later version.
14  */
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/stddef.h>
20 #include <linux/interrupt.h>
21 #include <linux/err.h>
22 #include <linux/module.h>
23
24 #include <asm/io.h>
25 #include <asm/immap_qe.h>
26 #include <asm/qe.h>
27
28 #include <asm/ucc.h>
29 #include <asm/ucc_slow.h>
30
31 u32 ucc_slow_get_qe_cr_subblock(int uccs_num)
32 {
33         switch (uccs_num) {
34         case 0: return QE_CR_SUBBLOCK_UCCSLOW1;
35         case 1: return QE_CR_SUBBLOCK_UCCSLOW2;
36         case 2: return QE_CR_SUBBLOCK_UCCSLOW3;
37         case 3: return QE_CR_SUBBLOCK_UCCSLOW4;
38         case 4: return QE_CR_SUBBLOCK_UCCSLOW5;
39         case 5: return QE_CR_SUBBLOCK_UCCSLOW6;
40         case 6: return QE_CR_SUBBLOCK_UCCSLOW7;
41         case 7: return QE_CR_SUBBLOCK_UCCSLOW8;
42         default: return QE_CR_SUBBLOCK_INVALID;
43         }
44 }
45 EXPORT_SYMBOL(ucc_slow_get_qe_cr_subblock);
46
47 void ucc_slow_poll_transmitter_now(struct ucc_slow_private * uccs)
48 {
49         out_be16(&uccs->us_regs->utodr, UCC_SLOW_TOD);
50 }
51
52 void ucc_slow_graceful_stop_tx(struct ucc_slow_private * uccs)
53 {
54         struct ucc_slow_info *us_info = uccs->us_info;
55         u32 id;
56
57         id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
58         qe_issue_cmd(QE_GRACEFUL_STOP_TX, id,
59                          QE_CR_PROTOCOL_UNSPECIFIED, 0);
60 }
61 EXPORT_SYMBOL(ucc_slow_graceful_stop_tx);
62
63 void ucc_slow_stop_tx(struct ucc_slow_private * uccs)
64 {
65         struct ucc_slow_info *us_info = uccs->us_info;
66         u32 id;
67
68         id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
69         qe_issue_cmd(QE_STOP_TX, id, QE_CR_PROTOCOL_UNSPECIFIED, 0);
70 }
71 EXPORT_SYMBOL(ucc_slow_stop_tx);
72
73 void ucc_slow_restart_tx(struct ucc_slow_private * uccs)
74 {
75         struct ucc_slow_info *us_info = uccs->us_info;
76         u32 id;
77
78         id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
79         qe_issue_cmd(QE_RESTART_TX, id, QE_CR_PROTOCOL_UNSPECIFIED, 0);
80 }
81 EXPORT_SYMBOL(ucc_slow_restart_tx);
82
83 void ucc_slow_enable(struct ucc_slow_private * uccs, enum comm_dir mode)
84 {
85         struct ucc_slow *us_regs;
86         u32 gumr_l;
87
88         us_regs = uccs->us_regs;
89
90         /* Enable reception and/or transmission on this UCC. */
91         gumr_l = in_be32(&us_regs->gumr_l);
92         if (mode & COMM_DIR_TX) {
93                 gumr_l |= UCC_SLOW_GUMR_L_ENT;
94                 uccs->enabled_tx = 1;
95         }
96         if (mode & COMM_DIR_RX) {
97                 gumr_l |= UCC_SLOW_GUMR_L_ENR;
98                 uccs->enabled_rx = 1;
99         }
100         out_be32(&us_regs->gumr_l, gumr_l);
101 }
102 EXPORT_SYMBOL(ucc_slow_enable);
103
104 void ucc_slow_disable(struct ucc_slow_private * uccs, enum comm_dir mode)
105 {
106         struct ucc_slow *us_regs;
107         u32 gumr_l;
108
109         us_regs = uccs->us_regs;
110
111         /* Disable reception and/or transmission on this UCC. */
112         gumr_l = in_be32(&us_regs->gumr_l);
113         if (mode & COMM_DIR_TX) {
114                 gumr_l &= ~UCC_SLOW_GUMR_L_ENT;
115                 uccs->enabled_tx = 0;
116         }
117         if (mode & COMM_DIR_RX) {
118                 gumr_l &= ~UCC_SLOW_GUMR_L_ENR;
119                 uccs->enabled_rx = 0;
120         }
121         out_be32(&us_regs->gumr_l, gumr_l);
122 }
123 EXPORT_SYMBOL(ucc_slow_disable);
124
125 /* Initialize the UCC for Slow operations
126  *
127  * The caller should initialize the following us_info
128  */
129 int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** uccs_ret)
130 {
131         struct ucc_slow_private *uccs;
132         u32 i;
133         struct ucc_slow __iomem *us_regs;
134         u32 gumr;
135         struct qe_bd *bd;
136         u32 id;
137         u32 command;
138         int ret = 0;
139
140         if (!us_info)
141                 return -EINVAL;
142
143         /* check if the UCC port number is in range. */
144         if ((us_info->ucc_num < 0) || (us_info->ucc_num > UCC_MAX_NUM - 1)) {
145                 printk(KERN_ERR "%s: illegal UCC number\n", __func__);
146                 return -EINVAL;
147         }
148
149         /*
150          * Set mrblr
151          * Check that 'max_rx_buf_length' is properly aligned (4), unless
152          * rfw is 1, meaning that QE accepts one byte at a time, unlike normal
153          * case when QE accepts 32 bits at a time.
154          */
155         if ((!us_info->rfw) &&
156                 (us_info->max_rx_buf_length & (UCC_SLOW_MRBLR_ALIGNMENT - 1))) {
157                 printk(KERN_ERR "max_rx_buf_length not aligned.\n");
158                 return -EINVAL;
159         }
160
161         uccs = kzalloc(sizeof(struct ucc_slow_private), GFP_KERNEL);
162         if (!uccs) {
163                 printk(KERN_ERR "%s: Cannot allocate private data\n",
164                         __func__);
165                 return -ENOMEM;
166         }
167
168         /* Fill slow UCC structure */
169         uccs->us_info = us_info;
170         /* Set the PHY base address */
171         uccs->us_regs = ioremap(us_info->regs, sizeof(struct ucc_slow));
172         if (uccs->us_regs == NULL) {
173                 printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
174                 kfree(uccs);
175                 return -ENOMEM;
176         }
177
178         uccs->saved_uccm = 0;
179         uccs->p_rx_frame = 0;
180         us_regs = uccs->us_regs;
181         uccs->p_ucce = (u16 *) & (us_regs->ucce);
182         uccs->p_uccm = (u16 *) & (us_regs->uccm);
183 #ifdef STATISTICS
184         uccs->rx_frames = 0;
185         uccs->tx_frames = 0;
186         uccs->rx_discarded = 0;
187 #endif                          /* STATISTICS */
188
189         /* Get PRAM base */
190         uccs->us_pram_offset =
191                 qe_muram_alloc(UCC_SLOW_PRAM_SIZE, ALIGNMENT_OF_UCC_SLOW_PRAM);
192         if (IS_ERR_VALUE(uccs->us_pram_offset)) {
193                 printk(KERN_ERR "%s: cannot allocate MURAM for PRAM", __func__);
194                 ucc_slow_free(uccs);
195                 return -ENOMEM;
196         }
197         id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
198         qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, id, us_info->protocol,
199                      uccs->us_pram_offset);
200
201         uccs->us_pram = qe_muram_addr(uccs->us_pram_offset);
202
203         /* Set UCC to slow type */
204         ret = ucc_set_type(us_info->ucc_num, UCC_SPEED_TYPE_SLOW);
205         if (ret) {
206                 printk(KERN_ERR "%s: cannot set UCC type", __func__);
207                 ucc_slow_free(uccs);
208                 return ret;
209         }
210
211         out_be16(&uccs->us_pram->mrblr, us_info->max_rx_buf_length);
212
213         INIT_LIST_HEAD(&uccs->confQ);
214
215         /* Allocate BDs. */
216         uccs->rx_base_offset =
217                 qe_muram_alloc(us_info->rx_bd_ring_len * sizeof(struct qe_bd),
218                                 QE_ALIGNMENT_OF_BD);
219         if (IS_ERR_VALUE(uccs->rx_base_offset)) {
220                 printk(KERN_ERR "%s: cannot allocate %u RX BDs\n", __func__,
221                         us_info->rx_bd_ring_len);
222                 uccs->rx_base_offset = 0;
223                 ucc_slow_free(uccs);
224                 return -ENOMEM;
225         }
226
227         uccs->tx_base_offset =
228                 qe_muram_alloc(us_info->tx_bd_ring_len * sizeof(struct qe_bd),
229                         QE_ALIGNMENT_OF_BD);
230         if (IS_ERR_VALUE(uccs->tx_base_offset)) {
231                 printk(KERN_ERR "%s: cannot allocate TX BDs", __func__);
232                 uccs->tx_base_offset = 0;
233                 ucc_slow_free(uccs);
234                 return -ENOMEM;
235         }
236
237         /* Init Tx bds */
238         bd = uccs->confBd = uccs->tx_bd = qe_muram_addr(uccs->tx_base_offset);
239         for (i = 0; i < us_info->tx_bd_ring_len - 1; i++) {
240                 /* clear bd buffer */
241                 out_be32(&bd->buf, 0);
242                 /* set bd status and length */
243                 out_be32((u32 *) bd, 0);
244                 bd++;
245         }
246         /* for last BD set Wrap bit */
247         out_be32(&bd->buf, 0);
248         out_be32((u32 *) bd, cpu_to_be32(T_W));
249
250         /* Init Rx bds */
251         bd = uccs->rx_bd = qe_muram_addr(uccs->rx_base_offset);
252         for (i = 0; i < us_info->rx_bd_ring_len - 1; i++) {
253                 /* set bd status and length */
254                 out_be32((u32*)bd, 0);
255                 /* clear bd buffer */
256                 out_be32(&bd->buf, 0);
257                 bd++;
258         }
259         /* for last BD set Wrap bit */
260         out_be32((u32*)bd, cpu_to_be32(R_W));
261         out_be32(&bd->buf, 0);
262
263         /* Set GUMR (For more details see the hardware spec.). */
264         /* gumr_h */
265         gumr = us_info->tcrc;
266         if (us_info->cdp)
267                 gumr |= UCC_SLOW_GUMR_H_CDP;
268         if (us_info->ctsp)
269                 gumr |= UCC_SLOW_GUMR_H_CTSP;
270         if (us_info->cds)
271                 gumr |= UCC_SLOW_GUMR_H_CDS;
272         if (us_info->ctss)
273                 gumr |= UCC_SLOW_GUMR_H_CTSS;
274         if (us_info->tfl)
275                 gumr |= UCC_SLOW_GUMR_H_TFL;
276         if (us_info->rfw)
277                 gumr |= UCC_SLOW_GUMR_H_RFW;
278         if (us_info->txsy)
279                 gumr |= UCC_SLOW_GUMR_H_TXSY;
280         if (us_info->rtsm)
281                 gumr |= UCC_SLOW_GUMR_H_RTSM;
282         out_be32(&us_regs->gumr_h, gumr);
283
284         /* gumr_l */
285         gumr = us_info->tdcr | us_info->rdcr | us_info->tenc | us_info->renc |
286                 us_info->diag | us_info->mode;
287         if (us_info->tci)
288                 gumr |= UCC_SLOW_GUMR_L_TCI;
289         if (us_info->rinv)
290                 gumr |= UCC_SLOW_GUMR_L_RINV;
291         if (us_info->tinv)
292                 gumr |= UCC_SLOW_GUMR_L_TINV;
293         if (us_info->tend)
294                 gumr |= UCC_SLOW_GUMR_L_TEND;
295         out_be32(&us_regs->gumr_l, gumr);
296
297         /* Function code registers */
298
299         /* if the data is in cachable memory, the 'global' */
300         /* in the function code should be set. */
301         uccs->us_pram->tbmr = UCC_BMR_BO_BE;
302         uccs->us_pram->rbmr = UCC_BMR_BO_BE;
303
304         /* rbase, tbase are offsets from MURAM base */
305         out_be16(&uccs->us_pram->rbase, uccs->rx_base_offset);
306         out_be16(&uccs->us_pram->tbase, uccs->tx_base_offset);
307
308         /* Mux clocking */
309         /* Grant Support */
310         ucc_set_qe_mux_grant(us_info->ucc_num, us_info->grant_support);
311         /* Breakpoint Support */
312         ucc_set_qe_mux_bkpt(us_info->ucc_num, us_info->brkpt_support);
313         /* Set Tsa or NMSI mode. */
314         ucc_set_qe_mux_tsa(us_info->ucc_num, us_info->tsa);
315         /* If NMSI (not Tsa), set Tx and Rx clock. */
316         if (!us_info->tsa) {
317                 /* Rx clock routing */
318                 if (ucc_set_qe_mux_rxtx(us_info->ucc_num, us_info->rx_clock,
319                                         COMM_DIR_RX)) {
320                         printk(KERN_ERR "%s: illegal value for RX clock\n",
321                                __func__);
322                         ucc_slow_free(uccs);
323                         return -EINVAL;
324                 }
325                 /* Tx clock routing */
326                 if (ucc_set_qe_mux_rxtx(us_info->ucc_num, us_info->tx_clock,
327                                         COMM_DIR_TX)) {
328                         printk(KERN_ERR "%s: illegal value for TX clock\n",
329                                __func__);
330                         ucc_slow_free(uccs);
331                         return -EINVAL;
332                 }
333         }
334
335         /* Set interrupt mask register at UCC level. */
336         out_be16(&us_regs->uccm, us_info->uccm_mask);
337
338         /* First, clear anything pending at UCC level,
339          * otherwise, old garbage may come through
340          * as soon as the dam is opened. */
341
342         /* Writing '1' clears */
343         out_be16(&us_regs->ucce, 0xffff);
344
345         /* Issue QE Init command */
346         if (us_info->init_tx && us_info->init_rx)
347                 command = QE_INIT_TX_RX;
348         else if (us_info->init_tx)
349                 command = QE_INIT_TX;
350         else
351                 command = QE_INIT_RX;   /* We know at least one is TRUE */
352
353         qe_issue_cmd(command, id, us_info->protocol, 0);
354
355         *uccs_ret = uccs;
356         return 0;
357 }
358 EXPORT_SYMBOL(ucc_slow_init);
359
360 void ucc_slow_free(struct ucc_slow_private * uccs)
361 {
362         if (!uccs)
363                 return;
364
365         if (uccs->rx_base_offset)
366                 qe_muram_free(uccs->rx_base_offset);
367
368         if (uccs->tx_base_offset)
369                 qe_muram_free(uccs->tx_base_offset);
370
371         if (uccs->us_pram)
372                 qe_muram_free(uccs->us_pram_offset);
373
374         if (uccs->us_regs)
375                 iounmap(uccs->us_regs);
376
377         kfree(uccs);
378 }
379 EXPORT_SYMBOL(ucc_slow_free);
380