Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / arch / powerpc / sysdev / qe_lib / ucc_fast.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 Fast API Set - UCC Fast 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_fast.h>
30
31 void ucc_fast_dump_regs(struct ucc_fast_private * uccf)
32 {
33         printk(KERN_INFO "UCC%u Fast registers:\n", uccf->uf_info->ucc_num);
34         printk(KERN_INFO "Base address: 0x%p\n", uccf->uf_regs);
35
36         printk(KERN_INFO "gumr  : addr=0x%p, val=0x%08x\n",
37                   &uccf->uf_regs->gumr, in_be32(&uccf->uf_regs->gumr));
38         printk(KERN_INFO "upsmr : addr=0x%p, val=0x%08x\n",
39                   &uccf->uf_regs->upsmr, in_be32(&uccf->uf_regs->upsmr));
40         printk(KERN_INFO "utodr : addr=0x%p, val=0x%04x\n",
41                   &uccf->uf_regs->utodr, in_be16(&uccf->uf_regs->utodr));
42         printk(KERN_INFO "udsr  : addr=0x%p, val=0x%04x\n",
43                   &uccf->uf_regs->udsr, in_be16(&uccf->uf_regs->udsr));
44         printk(KERN_INFO "ucce  : addr=0x%p, val=0x%08x\n",
45                   &uccf->uf_regs->ucce, in_be32(&uccf->uf_regs->ucce));
46         printk(KERN_INFO "uccm  : addr=0x%p, val=0x%08x\n",
47                   &uccf->uf_regs->uccm, in_be32(&uccf->uf_regs->uccm));
48         printk(KERN_INFO "uccs  : addr=0x%p, val=0x%02x\n",
49                   &uccf->uf_regs->uccs, in_8(&uccf->uf_regs->uccs));
50         printk(KERN_INFO "urfb  : addr=0x%p, val=0x%08x\n",
51                   &uccf->uf_regs->urfb, in_be32(&uccf->uf_regs->urfb));
52         printk(KERN_INFO "urfs  : addr=0x%p, val=0x%04x\n",
53                   &uccf->uf_regs->urfs, in_be16(&uccf->uf_regs->urfs));
54         printk(KERN_INFO "urfet : addr=0x%p, val=0x%04x\n",
55                   &uccf->uf_regs->urfet, in_be16(&uccf->uf_regs->urfet));
56         printk(KERN_INFO "urfset: addr=0x%p, val=0x%04x\n",
57                   &uccf->uf_regs->urfset, in_be16(&uccf->uf_regs->urfset));
58         printk(KERN_INFO "utfb  : addr=0x%p, val=0x%08x\n",
59                   &uccf->uf_regs->utfb, in_be32(&uccf->uf_regs->utfb));
60         printk(KERN_INFO "utfs  : addr=0x%p, val=0x%04x\n",
61                   &uccf->uf_regs->utfs, in_be16(&uccf->uf_regs->utfs));
62         printk(KERN_INFO "utfet : addr=0x%p, val=0x%04x\n",
63                   &uccf->uf_regs->utfet, in_be16(&uccf->uf_regs->utfet));
64         printk(KERN_INFO "utftt : addr=0x%p, val=0x%04x\n",
65                   &uccf->uf_regs->utftt, in_be16(&uccf->uf_regs->utftt));
66         printk(KERN_INFO "utpt  : addr=0x%p, val=0x%04x\n",
67                   &uccf->uf_regs->utpt, in_be16(&uccf->uf_regs->utpt));
68         printk(KERN_INFO "urtry : addr=0x%p, val=0x%08x\n",
69                   &uccf->uf_regs->urtry, in_be32(&uccf->uf_regs->urtry));
70         printk(KERN_INFO "guemr : addr=0x%p, val=0x%02x\n",
71                   &uccf->uf_regs->guemr, in_8(&uccf->uf_regs->guemr));
72 }
73 EXPORT_SYMBOL(ucc_fast_dump_regs);
74
75 u32 ucc_fast_get_qe_cr_subblock(int uccf_num)
76 {
77         switch (uccf_num) {
78         case 0: return QE_CR_SUBBLOCK_UCCFAST1;
79         case 1: return QE_CR_SUBBLOCK_UCCFAST2;
80         case 2: return QE_CR_SUBBLOCK_UCCFAST3;
81         case 3: return QE_CR_SUBBLOCK_UCCFAST4;
82         case 4: return QE_CR_SUBBLOCK_UCCFAST5;
83         case 5: return QE_CR_SUBBLOCK_UCCFAST6;
84         case 6: return QE_CR_SUBBLOCK_UCCFAST7;
85         case 7: return QE_CR_SUBBLOCK_UCCFAST8;
86         default: return QE_CR_SUBBLOCK_INVALID;
87         }
88 }
89 EXPORT_SYMBOL(ucc_fast_get_qe_cr_subblock);
90
91 void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf)
92 {
93         out_be16(&uccf->uf_regs->utodr, UCC_FAST_TOD);
94 }
95 EXPORT_SYMBOL(ucc_fast_transmit_on_demand);
96
97 void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode)
98 {
99         struct ucc_fast __iomem *uf_regs;
100         u32 gumr;
101
102         uf_regs = uccf->uf_regs;
103
104         /* Enable reception and/or transmission on this UCC. */
105         gumr = in_be32(&uf_regs->gumr);
106         if (mode & COMM_DIR_TX) {
107                 gumr |= UCC_FAST_GUMR_ENT;
108                 uccf->enabled_tx = 1;
109         }
110         if (mode & COMM_DIR_RX) {
111                 gumr |= UCC_FAST_GUMR_ENR;
112                 uccf->enabled_rx = 1;
113         }
114         out_be32(&uf_regs->gumr, gumr);
115 }
116 EXPORT_SYMBOL(ucc_fast_enable);
117
118 void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode)
119 {
120         struct ucc_fast __iomem *uf_regs;
121         u32 gumr;
122
123         uf_regs = uccf->uf_regs;
124
125         /* Disable reception and/or transmission on this UCC. */
126         gumr = in_be32(&uf_regs->gumr);
127         if (mode & COMM_DIR_TX) {
128                 gumr &= ~UCC_FAST_GUMR_ENT;
129                 uccf->enabled_tx = 0;
130         }
131         if (mode & COMM_DIR_RX) {
132                 gumr &= ~UCC_FAST_GUMR_ENR;
133                 uccf->enabled_rx = 0;
134         }
135         out_be32(&uf_regs->gumr, gumr);
136 }
137 EXPORT_SYMBOL(ucc_fast_disable);
138
139 int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret)
140 {
141         struct ucc_fast_private *uccf;
142         struct ucc_fast __iomem *uf_regs;
143         u32 gumr;
144         int ret;
145
146         if (!uf_info)
147                 return -EINVAL;
148
149         /* check if the UCC port number is in range. */
150         if ((uf_info->ucc_num < 0) || (uf_info->ucc_num > UCC_MAX_NUM - 1)) {
151                 printk(KERN_ERR "%s: illegal UCC number\n", __func__);
152                 return -EINVAL;
153         }
154
155         /* Check that 'max_rx_buf_length' is properly aligned (4). */
156         if (uf_info->max_rx_buf_length & (UCC_FAST_MRBLR_ALIGNMENT - 1)) {
157                 printk(KERN_ERR "%s: max_rx_buf_length not aligned\n",
158                         __func__);
159                 return -EINVAL;
160         }
161
162         /* Validate Virtual Fifo register values */
163         if (uf_info->urfs < UCC_FAST_URFS_MIN_VAL) {
164                 printk(KERN_ERR "%s: urfs is too small\n", __func__);
165                 return -EINVAL;
166         }
167
168         if (uf_info->urfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
169                 printk(KERN_ERR "%s: urfs is not aligned\n", __func__);
170                 return -EINVAL;
171         }
172
173         if (uf_info->urfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
174                 printk(KERN_ERR "%s: urfet is not aligned.\n", __func__);
175                 return -EINVAL;
176         }
177
178         if (uf_info->urfset & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
179                 printk(KERN_ERR "%s: urfset is not aligned\n", __func__);
180                 return -EINVAL;
181         }
182
183         if (uf_info->utfs & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
184                 printk(KERN_ERR "%s: utfs is not aligned\n", __func__);
185                 return -EINVAL;
186         }
187
188         if (uf_info->utfet & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
189                 printk(KERN_ERR "%s: utfet is not aligned\n", __func__);
190                 return -EINVAL;
191         }
192
193         if (uf_info->utftt & (UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT - 1)) {
194                 printk(KERN_ERR "%s: utftt is not aligned\n", __func__);
195                 return -EINVAL;
196         }
197
198         uccf = kzalloc(sizeof(struct ucc_fast_private), GFP_KERNEL);
199         if (!uccf) {
200                 printk(KERN_ERR "%s: Cannot allocate private data\n",
201                         __func__);
202                 return -ENOMEM;
203         }
204
205         /* Fill fast UCC structure */
206         uccf->uf_info = uf_info;
207         /* Set the PHY base address */
208         uccf->uf_regs = ioremap(uf_info->regs, sizeof(struct ucc_fast));
209         if (uccf->uf_regs == NULL) {
210                 printk(KERN_ERR "%s: Cannot map UCC registers\n", __func__);
211                 kfree(uccf);
212                 return -ENOMEM;
213         }
214
215         uccf->enabled_tx = 0;
216         uccf->enabled_rx = 0;
217         uccf->stopped_tx = 0;
218         uccf->stopped_rx = 0;
219         uf_regs = uccf->uf_regs;
220         uccf->p_ucce = &uf_regs->ucce;
221         uccf->p_uccm = &uf_regs->uccm;
222 #ifdef CONFIG_UGETH_TX_ON_DEMAND
223         uccf->p_utodr = &uf_regs->utodr;
224 #endif
225 #ifdef STATISTICS
226         uccf->tx_frames = 0;
227         uccf->rx_frames = 0;
228         uccf->rx_discarded = 0;
229 #endif                          /* STATISTICS */
230
231         /* Set UCC to fast type */
232         ret = ucc_set_type(uf_info->ucc_num, UCC_SPEED_TYPE_FAST);
233         if (ret) {
234                 printk(KERN_ERR "%s: cannot set UCC type\n", __func__);
235                 ucc_fast_free(uccf);
236                 return ret;
237         }
238
239         uccf->mrblr = uf_info->max_rx_buf_length;
240
241         /* Set GUMR */
242         /* For more details see the hardware spec. */
243         gumr = uf_info->ttx_trx;
244         if (uf_info->tci)
245                 gumr |= UCC_FAST_GUMR_TCI;
246         if (uf_info->cdp)
247                 gumr |= UCC_FAST_GUMR_CDP;
248         if (uf_info->ctsp)
249                 gumr |= UCC_FAST_GUMR_CTSP;
250         if (uf_info->cds)
251                 gumr |= UCC_FAST_GUMR_CDS;
252         if (uf_info->ctss)
253                 gumr |= UCC_FAST_GUMR_CTSS;
254         if (uf_info->txsy)
255                 gumr |= UCC_FAST_GUMR_TXSY;
256         if (uf_info->rsyn)
257                 gumr |= UCC_FAST_GUMR_RSYN;
258         gumr |= uf_info->synl;
259         if (uf_info->rtsm)
260                 gumr |= UCC_FAST_GUMR_RTSM;
261         gumr |= uf_info->renc;
262         if (uf_info->revd)
263                 gumr |= UCC_FAST_GUMR_REVD;
264         gumr |= uf_info->tenc;
265         gumr |= uf_info->tcrc;
266         gumr |= uf_info->mode;
267         out_be32(&uf_regs->gumr, gumr);
268
269         /* Allocate memory for Tx Virtual Fifo */
270         uccf->ucc_fast_tx_virtual_fifo_base_offset =
271             qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
272         if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
273                 printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
274                         __func__);
275                 uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
276                 ucc_fast_free(uccf);
277                 return -ENOMEM;
278         }
279
280         /* Allocate memory for Rx Virtual Fifo */
281         uccf->ucc_fast_rx_virtual_fifo_base_offset =
282                 qe_muram_alloc(uf_info->urfs +
283                            UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
284                            UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
285         if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
286                 printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
287                         __func__);
288                 uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
289                 ucc_fast_free(uccf);
290                 return -ENOMEM;
291         }
292
293         /* Set Virtual Fifo registers */
294         out_be16(&uf_regs->urfs, uf_info->urfs);
295         out_be16(&uf_regs->urfet, uf_info->urfet);
296         out_be16(&uf_regs->urfset, uf_info->urfset);
297         out_be16(&uf_regs->utfs, uf_info->utfs);
298         out_be16(&uf_regs->utfet, uf_info->utfet);
299         out_be16(&uf_regs->utftt, uf_info->utftt);
300         /* utfb, urfb are offsets from MURAM base */
301         out_be32(&uf_regs->utfb, uccf->ucc_fast_tx_virtual_fifo_base_offset);
302         out_be32(&uf_regs->urfb, uccf->ucc_fast_rx_virtual_fifo_base_offset);
303
304         /* Mux clocking */
305         /* Grant Support */
306         ucc_set_qe_mux_grant(uf_info->ucc_num, uf_info->grant_support);
307         /* Breakpoint Support */
308         ucc_set_qe_mux_bkpt(uf_info->ucc_num, uf_info->brkpt_support);
309         /* Set Tsa or NMSI mode. */
310         ucc_set_qe_mux_tsa(uf_info->ucc_num, uf_info->tsa);
311         /* If NMSI (not Tsa), set Tx and Rx clock. */
312         if (!uf_info->tsa) {
313                 /* Rx clock routing */
314                 if ((uf_info->rx_clock != QE_CLK_NONE) &&
315                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->rx_clock,
316                                         COMM_DIR_RX)) {
317                         printk(KERN_ERR "%s: illegal value for RX clock\n",
318                                __func__);
319                         ucc_fast_free(uccf);
320                         return -EINVAL;
321                 }
322                 /* Tx clock routing */
323                 if ((uf_info->tx_clock != QE_CLK_NONE) &&
324                     ucc_set_qe_mux_rxtx(uf_info->ucc_num, uf_info->tx_clock,
325                                         COMM_DIR_TX)) {
326                         printk(KERN_ERR "%s: illegal value for TX clock\n",
327                                __func__);
328                         ucc_fast_free(uccf);
329                         return -EINVAL;
330                 }
331         }
332
333         /* Set interrupt mask register at UCC level. */
334         out_be32(&uf_regs->uccm, uf_info->uccm_mask);
335
336         /* First, clear anything pending at UCC level,
337          * otherwise, old garbage may come through
338          * as soon as the dam is opened. */
339
340         /* Writing '1' clears */
341         out_be32(&uf_regs->ucce, 0xffffffff);
342
343         *uccf_ret = uccf;
344         return 0;
345 }
346 EXPORT_SYMBOL(ucc_fast_init);
347
348 void ucc_fast_free(struct ucc_fast_private * uccf)
349 {
350         if (!uccf)
351                 return;
352
353         if (uccf->ucc_fast_tx_virtual_fifo_base_offset)
354                 qe_muram_free(uccf->ucc_fast_tx_virtual_fifo_base_offset);
355
356         if (uccf->ucc_fast_rx_virtual_fifo_base_offset)
357                 qe_muram_free(uccf->ucc_fast_rx_virtual_fifo_base_offset);
358
359         if (uccf->uf_regs)
360                 iounmap(uccf->uf_regs);
361
362         kfree(uccf);
363 }
364 EXPORT_SYMBOL(ucc_fast_free);