2 * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
4 * Authors: Shlomi Gridish <gridish@freescale.com>
5 * Li Yang <leoli@freescale.com>
8 * Internal header file for UCC SLOW unit routines.
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 #ifndef __UCC_SLOW_H__
16 #define __UCC_SLOW_H__
18 #include <linux/kernel.h>
20 #include <asm/immap_qe.h>
25 /* transmit BD's status */
26 #define T_R 0x80000000 /* ready bit */
27 #define T_PAD 0x40000000 /* add pads to short frames */
28 #define T_W 0x20000000 /* wrap bit */
29 #define T_I 0x10000000 /* interrupt on completion */
30 #define T_L 0x08000000 /* last */
32 #define T_A 0x04000000 /* Address - the data transmitted as address
34 #define T_TC 0x04000000 /* transmit CRC */
35 #define T_CM 0x02000000 /* continuous mode */
36 #define T_DEF 0x02000000 /* collision on previous attempt to transmit */
37 #define T_P 0x01000000 /* Preamble - send Preamble sequence before
39 #define T_HB 0x01000000 /* heartbeat */
40 #define T_NS 0x00800000 /* No Stop */
41 #define T_LC 0x00800000 /* late collision */
42 #define T_RL 0x00400000 /* retransmission limit */
43 #define T_UN 0x00020000 /* underrun */
44 #define T_CT 0x00010000 /* CTS lost */
45 #define T_CSL 0x00010000 /* carrier sense lost */
46 #define T_RC 0x003c0000 /* retry count */
48 /* Receive BD's status */
49 #define R_E 0x80000000 /* buffer empty */
50 #define R_W 0x20000000 /* wrap bit */
51 #define R_I 0x10000000 /* interrupt on reception */
52 #define R_L 0x08000000 /* last */
53 #define R_C 0x08000000 /* the last byte in this buffer is a cntl
55 #define R_F 0x04000000 /* first */
56 #define R_A 0x04000000 /* the first byte in this buffer is address
58 #define R_CM 0x02000000 /* continuous mode */
59 #define R_ID 0x01000000 /* buffer close on reception of idles */
60 #define R_M 0x01000000 /* Frame received because of promiscuous
62 #define R_AM 0x00800000 /* Address match */
63 #define R_DE 0x00800000 /* Address match */
64 #define R_LG 0x00200000 /* Break received */
65 #define R_BR 0x00200000 /* Frame length violation */
66 #define R_NO 0x00100000 /* Rx Non Octet Aligned Packet */
67 #define R_FR 0x00100000 /* Framing Error (no stop bit) character
69 #define R_PR 0x00080000 /* Parity Error character received */
70 #define R_AB 0x00080000 /* Frame Aborted */
71 #define R_SH 0x00080000 /* frame is too short */
72 #define R_CR 0x00040000 /* CRC Error */
73 #define R_OV 0x00020000 /* Overrun */
74 #define R_CD 0x00010000 /* CD lost */
75 #define R_CL 0x00010000 /* this frame is closed because of a
78 /* Rx Data buffer must be 4 bytes aligned in most cases.*/
79 #define UCC_SLOW_RX_ALIGN 4
80 #define UCC_SLOW_MRBLR_ALIGNMENT 4
81 #define UCC_SLOW_PRAM_SIZE 0x100
82 #define ALIGNMENT_OF_UCC_SLOW_PRAM 64
84 /* UCC Slow Channel Protocol Mode */
85 enum ucc_slow_channel_protocol_mode {
86 UCC_SLOW_CHANNEL_PROTOCOL_MODE_QMC = 0x00000002,
87 UCC_SLOW_CHANNEL_PROTOCOL_MODE_UART = 0x00000004,
88 UCC_SLOW_CHANNEL_PROTOCOL_MODE_BISYNC = 0x00000008,
91 /* UCC Slow Transparent Transmit CRC (TCRC) */
92 enum ucc_slow_transparent_tcrc {
93 /* 16-bit CCITT CRC (HDLC). (X16 + X12 + X5 + 1) */
94 UCC_SLOW_TRANSPARENT_TCRC_CCITT_CRC16 = 0x00000000,
95 /* CRC16 (BISYNC). (X16 + X15 + X2 + 1) */
96 UCC_SLOW_TRANSPARENT_TCRC_CRC16 = 0x00004000,
97 /* 32-bit CCITT CRC (Ethernet and HDLC) */
98 UCC_SLOW_TRANSPARENT_TCRC_CCITT_CRC32 = 0x00008000,
101 /* UCC Slow oversampling rate for transmitter (TDCR) */
102 enum ucc_slow_tx_oversampling_rate {
104 UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_1 = 0x00000000,
106 UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_8 = 0x00010000,
108 UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_16 = 0x00020000,
110 UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_32 = 0x00030000,
113 /* UCC Slow Oversampling rate for receiver (RDCR)
115 enum ucc_slow_rx_oversampling_rate {
117 UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_1 = 0x00000000,
119 UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_8 = 0x00004000,
121 UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_16 = 0x00008000,
123 UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_32 = 0x0000c000,
126 /* UCC Slow Transmitter encoding method (TENC)
128 enum ucc_slow_tx_encoding_method {
129 UCC_SLOW_TRANSMITTER_ENCODING_METHOD_TENC_NRZ = 0x00000000,
130 UCC_SLOW_TRANSMITTER_ENCODING_METHOD_TENC_NRZI = 0x00000100
133 /* UCC Slow Receiver decoding method (RENC)
135 enum ucc_slow_rx_decoding_method {
136 UCC_SLOW_RECEIVER_DECODING_METHOD_RENC_NRZ = 0x00000000,
137 UCC_SLOW_RECEIVER_DECODING_METHOD_RENC_NRZI = 0x00000800
140 /* UCC Slow Diagnostic mode (DIAG)
142 enum ucc_slow_diag_mode {
143 UCC_SLOW_DIAG_MODE_NORMAL = 0x00000000,
144 UCC_SLOW_DIAG_MODE_LOOPBACK = 0x00000040,
145 UCC_SLOW_DIAG_MODE_ECHO = 0x00000080,
146 UCC_SLOW_DIAG_MODE_LOOPBACK_ECHO = 0x000000c0
149 struct ucc_slow_info {
151 int protocol; /* QE_CR_PROTOCOL_xxx */
152 enum qe_clock rx_clock;
153 enum qe_clock tx_clock;
178 u16 max_rx_buf_length;
179 enum ucc_slow_transparent_tcrc tcrc;
180 enum ucc_slow_channel_protocol_mode mode;
181 enum ucc_slow_diag_mode diag;
182 enum ucc_slow_tx_oversampling_rate tdcr;
183 enum ucc_slow_rx_oversampling_rate rdcr;
184 enum ucc_slow_tx_encoding_method tenc;
185 enum ucc_slow_rx_decoding_method renc;
188 struct ucc_slow_private {
189 struct ucc_slow_info *us_info;
190 struct ucc_slow __iomem *us_regs; /* Ptr to memory map of UCC regs */
191 struct ucc_slow_pram *us_pram; /* a pointer to the parameter RAM */
193 int enabled_tx; /* Whether channel is enabled for Tx (ENT) */
194 int enabled_rx; /* Whether channel is enabled for Rx (ENR) */
195 int stopped_tx; /* Whether channel has been stopped for Tx
197 int stopped_rx; /* Whether channel has been stopped for Rx */
198 struct list_head confQ; /* frames passed to chip waiting for tx */
199 u32 first_tx_bd_mask; /* mask is used in Tx routine to save status
200 and length for first BD in a frame */
201 u32 tx_base_offset; /* first BD in Tx BD table offset (In MURAM) */
202 u32 rx_base_offset; /* first BD in Rx BD table offset (In MURAM) */
203 struct qe_bd *confBd; /* next BD for confirm after Tx */
204 struct qe_bd *tx_bd; /* next BD for new Tx request */
205 struct qe_bd *rx_bd; /* next BD to collect after Rx */
206 void *p_rx_frame; /* accumulating receive frame */
207 u16 *p_ucce; /* a pointer to the event register in memory.
209 u16 *p_uccm; /* a pointer to the mask register in memory */
210 u16 saved_uccm; /* a saved mask for the RX Interrupt bits */
212 u32 tx_frames; /* Transmitted frames counters */
213 u32 rx_frames; /* Received frames counters (only frames
214 passed to application) */
215 u32 rx_discarded; /* Discarded frames counters (frames that
216 were discarded by the driver due to
218 #endif /* STATISTICS */
222 * Initializes Slow UCC according to provided parameters.
224 * us_info - (In) pointer to the slow UCC info structure.
225 * uccs_ret - (Out) pointer to the slow UCC structure.
227 int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** uccs_ret);
230 * Frees all resources for slow UCC.
232 * uccs - (In) pointer to the slow UCC structure.
234 void ucc_slow_free(struct ucc_slow_private * uccs);
237 * Enables a fast UCC port.
238 * This routine enables Tx and/or Rx through the General UCC Mode Register.
240 * uccs - (In) pointer to the slow UCC structure.
241 * mode - (In) TX, RX, or both.
243 void ucc_slow_enable(struct ucc_slow_private * uccs, enum comm_dir mode);
246 * Disables a fast UCC port.
247 * This routine disables Tx and/or Rx through the General UCC Mode Register.
249 * uccs - (In) pointer to the slow UCC structure.
250 * mode - (In) TX, RX, or both.
252 void ucc_slow_disable(struct ucc_slow_private * uccs, enum comm_dir mode);
254 /* ucc_slow_poll_transmitter_now
255 * Immediately forces a poll of the transmitter for data to be sent.
256 * Typically, the hardware performs a periodic poll for data that the
257 * transmit routine has set up to be transmitted. In cases where
258 * this polling cycle is not soon enough, this optional routine can
259 * be invoked to force a poll right away, instead. Proper use for
260 * each transmission for which this functionality is desired is to
261 * call the transmit routine and then this routine right after.
263 * uccs - (In) pointer to the slow UCC structure.
265 void ucc_slow_poll_transmitter_now(struct ucc_slow_private * uccs);
267 /* ucc_slow_graceful_stop_tx
268 * Smoothly stops transmission on a specified slow UCC.
270 * uccs - (In) pointer to the slow UCC structure.
272 void ucc_slow_graceful_stop_tx(struct ucc_slow_private * uccs);
275 * Stops transmission on a specified slow UCC.
277 * uccs - (In) pointer to the slow UCC structure.
279 void ucc_slow_stop_tx(struct ucc_slow_private * uccs);
281 /* ucc_slow_restart_tx
282 * Restarts transmitting on a specified slow UCC.
284 * uccs - (In) pointer to the slow UCC structure.
286 void ucc_slow_restart_tx(struct ucc_slow_private *uccs);
288 u32 ucc_slow_get_qe_cr_subblock(int uccs_num);
290 #endif /* __UCC_SLOW_H__ */