Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ucc_fast.c
Go to the documentation of this file.
1 /*
2  * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
3  *
4  * Authors: Shlomi Gridish <[email protected]>
5  * Li Yang <[email protected]>
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/export.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);
Generated on Thu Jan 10 2013 13:16:22 for Linux Kernel by   doxygen 1.8.2