arch/powerpc/include/asm/ucc_slow.h

   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  * Internal header file for UCC SLOW unit routines.
   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 #ifndef __UCC_SLOW_H__
  16 #define __UCC_SLOW_H__
  17
  18 #include <linux/kernel.h>
  19
  20 #include <asm/immap_qe.h>
  21 #include <asm/qe.h>
  22
  23 #include "ucc.h"
  24
  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 */
  31
  32 #define T_A     0x04000000      /* Address - the data transmitted as address
  33                                    chars */
  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
  38                                    data */
  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 */
  47
  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
  54                                    char */
  55 #define R_F     0x04000000      /* first */
  56 #define R_A     0x04000000      /* the first byte in this buffer is address
  57                                    byte */
  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
  61                                    mode */
  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
  68                                    received */
  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
  76                                    collision */
  77
  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
  83
  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,
  89 };
  90
  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,
  99 };
 100
 101 /* UCC Slow oversampling rate for transmitter (TDCR) */
 102 enum ucc_slow_tx_oversampling_rate {
 103         /* 1x clock mode */
 104         UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_1 = 0x00000000,
 105         /* 8x clock mode */
 106         UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_8 = 0x00010000,
 107         /* 16x clock mode */
 108         UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_16 = 0x00020000,
 109         /* 32x clock mode */
 110         UCC_SLOW_OVERSAMPLING_RATE_TX_TDCR_32 = 0x00030000,
 111 };
 112
 113 /* UCC Slow Oversampling rate for receiver (RDCR)
 114 */
 115 enum ucc_slow_rx_oversampling_rate {
 116         /* 1x clock mode */
 117         UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_1 = 0x00000000,
 118         /* 8x clock mode */
 119         UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_8 = 0x00004000,
 120         /* 16x clock mode */
 121         UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_16 = 0x00008000,
 122         /* 32x clock mode */
 123         UCC_SLOW_OVERSAMPLING_RATE_RX_RDCR_32 = 0x0000c000,
 124 };
 125
 126 /* UCC Slow Transmitter encoding method (TENC)
 127 */
 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
 131 };
 132
 133 /* UCC Slow Receiver decoding method (RENC)
 134 */
 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
 138 };
 139
 140 /* UCC Slow Diagnostic mode (DIAG)
 141 */
 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
 147 };
 148
 149 struct ucc_slow_info {
 150         int ucc_num;
 151         int protocol;                   /* QE_CR_PROTOCOL_xxx */
 152         enum qe_clock rx_clock;
 153         enum qe_clock tx_clock;
 154         phys_addr_t regs;
 155         int irq;
 156         u16 uccm_mask;
 157         int data_mem_part;
 158         int init_tx;
 159         int init_rx;
 160         u32 tx_bd_ring_len;
 161         u32 rx_bd_ring_len;
 162         int rx_interrupts;
 163         int brkpt_support;
 164         int grant_support;
 165         int tsa;
 166         int cdp;
 167         int cds;
 168         int ctsp;
 169         int ctss;
 170         int rinv;
 171         int tinv;
 172         int rtsm;
 173         int rfw;
 174         int tci;
 175         int tend;
 176         int tfl;
 177         int txsy;
 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;
 186 };
 187
 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 */
 192         u32 us_pram_offset;
 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
 196                                    (STOP_TX, etc.) */
 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.
 208                                  */
 209         u16 *p_uccm;            /* a pointer to the mask register in memory */
 210         u16 saved_uccm;         /* a saved mask for the RX Interrupt bits */
 211 #ifdef STATISTICS
 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
 217                                    errors) */
 218 #endif                          /* STATISTICS */
 219 };
 220
 221 /* ucc_slow_init
 222  * Initializes Slow UCC according to provided parameters.
 223  *
 224  * us_info  - (In) pointer to the slow UCC info structure.
 225  * uccs_ret - (Out) pointer to the slow UCC structure.
 226  */
 227 int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** uccs_ret);
 228
 229 /* ucc_slow_free
 230  * Frees all resources for slow UCC.
 231  *
 232  * uccs - (In) pointer to the slow UCC structure.
 233  */
 234 void ucc_slow_free(struct ucc_slow_private * uccs);
 235
 236 /* ucc_slow_enable
 237  * Enables a fast UCC port.
 238  * This routine enables Tx and/or Rx through the General UCC Mode Register.
 239  *
 240  * uccs - (In) pointer to the slow UCC structure.
 241  * mode - (In) TX, RX, or both.
 242  */
 243 void ucc_slow_enable(struct ucc_slow_private * uccs, enum comm_dir mode);
 244
 245 /* ucc_slow_disable
 246  * Disables a fast UCC port.
 247  * This routine disables Tx and/or Rx through the General UCC Mode Register.
 248  *
 249  * uccs - (In) pointer to the slow UCC structure.
 250  * mode - (In) TX, RX, or both.
 251  */
 252 void ucc_slow_disable(struct ucc_slow_private * uccs, enum comm_dir mode);
 253
 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.
 262  *
 263  * uccs - (In) pointer to the slow UCC structure.
 264  */
 265 void ucc_slow_poll_transmitter_now(struct ucc_slow_private * uccs);
 266
 267 /* ucc_slow_graceful_stop_tx
 268  * Smoothly stops transmission on a specified slow UCC.
 269  *
 270  * uccs - (In) pointer to the slow UCC structure.
 271  */
 272 void ucc_slow_graceful_stop_tx(struct ucc_slow_private * uccs);
 273
 274 /* ucc_slow_stop_tx
 275  * Stops transmission on a specified slow UCC.
 276  *
 277  * uccs - (In) pointer to the slow UCC structure.
 278  */
 279 void ucc_slow_stop_tx(struct ucc_slow_private * uccs);
 280
 281 /* ucc_slow_restart_tx
 282  * Restarts transmitting on a specified slow UCC.
 283  *
 284  * uccs - (In) pointer to the slow UCC structure.
 285  */
 286 void ucc_slow_restart_tx(struct ucc_slow_private *uccs);
 287
 288 u32 ucc_slow_get_qe_cr_subblock(int uccs_num);
 289
 290 #endif                          /* __UCC_SLOW_H__ */