MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / arch / powerpc / sysdev / qe_lib / ucc_slow.c
blobe1d6a13401578cc99a6bcda1ae9aebffd9b5ec02
1 /*
2 * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
4 * Authors: Shlomi Gridish <gridish@freescale.com>
5 * Li Yang <leoli@freescale.com>
7 * Description:
8 * QE UCC Slow API Set - UCC Slow specific routines implementations.
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.
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>
24 #include <asm/io.h>
25 #include <asm/immap_qe.h>
26 #include <asm/qe.h>
28 #include <asm/ucc.h>
29 #include <asm/ucc_slow.h>
31 u32 ucc_slow_get_qe_cr_subblock(int uccs_num)
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;
45 EXPORT_SYMBOL(ucc_slow_get_qe_cr_subblock);
47 void ucc_slow_poll_transmitter_now(struct ucc_slow_private * uccs)
49 out_be16(&uccs->us_regs->utodr, UCC_SLOW_TOD);
52 void ucc_slow_graceful_stop_tx(struct ucc_slow_private * uccs)
54 struct ucc_slow_info *us_info = uccs->us_info;
55 u32 id;
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);
61 EXPORT_SYMBOL(ucc_slow_graceful_stop_tx);
63 void ucc_slow_stop_tx(struct ucc_slow_private * uccs)
65 struct ucc_slow_info *us_info = uccs->us_info;
66 u32 id;
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);
71 EXPORT_SYMBOL(ucc_slow_stop_tx);
73 void ucc_slow_restart_tx(struct ucc_slow_private * uccs)
75 struct ucc_slow_info *us_info = uccs->us_info;
76 u32 id;
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);
81 EXPORT_SYMBOL(ucc_slow_restart_tx);
83 void ucc_slow_enable(struct ucc_slow_private * uccs, enum comm_dir mode)
85 struct ucc_slow *us_regs;
86 u32 gumr_l;
88 us_regs = uccs->us_regs;
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;
96 if (mode & COMM_DIR_RX) {
97 gumr_l |= UCC_SLOW_GUMR_L_ENR;
98 uccs->enabled_rx = 1;
100 out_be32(&us_regs->gumr_l, gumr_l);
102 EXPORT_SYMBOL(ucc_slow_enable);
104 void ucc_slow_disable(struct ucc_slow_private * uccs, enum comm_dir mode)
106 struct ucc_slow *us_regs;
107 u32 gumr_l;
109 us_regs = uccs->us_regs;
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;
117 if (mode & COMM_DIR_RX) {
118 gumr_l &= ~UCC_SLOW_GUMR_L_ENR;
119 uccs->enabled_rx = 0;
121 out_be32(&us_regs->gumr_l, gumr_l);
123 EXPORT_SYMBOL(ucc_slow_disable);
125 /* Initialize the UCC for Slow operations
127 * The caller should initialize the following us_info
129 int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** uccs_ret)
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;
140 if (!us_info)
141 return -EINVAL;
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;
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.
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;
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;
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;
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 */
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;
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);
201 uccs->us_pram = qe_muram_addr(uccs->us_pram_offset);
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;
211 out_be16(&uccs->us_pram->mrblr, us_info->max_rx_buf_length);
213 INIT_LIST_HEAD(&uccs->confQ);
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;
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;
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++;
246 /* for last BD set Wrap bit */
247 out_be32(&bd->buf, 0);
248 out_be32((u32 *) bd, cpu_to_be32(T_W));
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++;
259 /* for last BD set Wrap bit */
260 out_be32((u32*)bd, cpu_to_be32(R_W));
261 out_be32(&bd->buf, 0);
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);
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);
297 /* Function code registers */
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;
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);
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;
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;
335 /* Set interrupt mask register at UCC level. */
336 out_be16(&us_regs->uccm, us_info->uccm_mask);
338 /* First, clear anything pending at UCC level,
339 * otherwise, old garbage may come through
340 * as soon as the dam is opened. */
342 /* Writing '1' clears */
343 out_be16(&us_regs->ucce, 0xffff);
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 */
353 qe_issue_cmd(command, id, us_info->protocol, 0);
355 *uccs_ret = uccs;
356 return 0;
358 EXPORT_SYMBOL(ucc_slow_init);
360 void ucc_slow_free(struct ucc_slow_private * uccs)
362 if (!uccs)
363 return;
365 if (uccs->rx_base_offset)
366 qe_muram_free(uccs->rx_base_offset);
368 if (uccs->tx_base_offset)
369 qe_muram_free(uccs->tx_base_offset);
371 if (uccs->us_pram)
372 qe_muram_free(uccs->us_pram_offset);
374 if (uccs->us_regs)
375 iounmap(uccs->us_regs);
377 kfree(uccs);
379 EXPORT_SYMBOL(ucc_slow_free);