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ucc_fast.h

/*
 * Internal header file for UCC FAST unit routines.
 *
 * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
 *
 * Authors:       Shlomi Gridish <gridish@freescale.com>
 *          Li Yang <leoli@freescale.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#ifndef __UCC_FAST_H__
#define __UCC_FAST_H__

#include <linux/kernel.h>

#include <asm/immap_qe.h>
#include <asm/qe.h>

#include "ucc.h"

/* Receive BD's status */
#define R_E 0x80000000  /* buffer empty */
#define R_W 0x20000000  /* wrap bit */
#define R_I 0x10000000  /* interrupt on reception */
#define R_L 0x08000000  /* last */
#define R_F 0x04000000  /* first */

/* transmit BD's status */
#define T_R 0x80000000  /* ready bit */
#define T_W 0x20000000  /* wrap bit */
#define T_I 0x10000000  /* interrupt on completion */
#define T_L 0x08000000  /* last */

/* Rx Data buffer must be 4 bytes aligned in most cases */
#define UCC_FAST_RX_ALIGN                 4
#define UCC_FAST_MRBLR_ALIGNMENT          4
#define UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT 8

/* Sizes */
#define UCC_FAST_URFS_MIN_VAL                   0x88
#define UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR     8

/* ucc_fast_channel_protocol_mode - UCC FAST mode */
enum ucc_fast_channel_protocol_mode {
      UCC_FAST_PROTOCOL_MODE_HDLC = 0x00000000,
      UCC_FAST_PROTOCOL_MODE_RESERVED01 = 0x00000001,
      UCC_FAST_PROTOCOL_MODE_RESERVED_QMC = 0x00000002,
      UCC_FAST_PROTOCOL_MODE_RESERVED02 = 0x00000003,
      UCC_FAST_PROTOCOL_MODE_RESERVED_UART = 0x00000004,
      UCC_FAST_PROTOCOL_MODE_RESERVED03 = 0x00000005,
      UCC_FAST_PROTOCOL_MODE_RESERVED_EX_MAC_1 = 0x00000006,
      UCC_FAST_PROTOCOL_MODE_RESERVED_EX_MAC_2 = 0x00000007,
      UCC_FAST_PROTOCOL_MODE_RESERVED_BISYNC = 0x00000008,
      UCC_FAST_PROTOCOL_MODE_RESERVED04 = 0x00000009,
      UCC_FAST_PROTOCOL_MODE_ATM = 0x0000000A,
      UCC_FAST_PROTOCOL_MODE_RESERVED05 = 0x0000000B,
      UCC_FAST_PROTOCOL_MODE_ETHERNET = 0x0000000C,
      UCC_FAST_PROTOCOL_MODE_RESERVED06 = 0x0000000D,
      UCC_FAST_PROTOCOL_MODE_POS = 0x0000000E,
      UCC_FAST_PROTOCOL_MODE_RESERVED07 = 0x0000000F
};

/* ucc_fast_transparent_txrx - UCC Fast Transparent TX & RX */
enum ucc_fast_transparent_txrx {
      UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_NORMAL = 0x00000000,
      UCC_FAST_GUMR_TRANSPARENT_TTX_TRX_TRANSPARENT = 0x18000000
};

/* UCC fast diagnostic mode */
enum ucc_fast_diag_mode {
      UCC_FAST_DIAGNOSTIC_NORMAL = 0x0,
      UCC_FAST_DIAGNOSTIC_LOCAL_LOOP_BACK = 0x40000000,
      UCC_FAST_DIAGNOSTIC_AUTO_ECHO = 0x80000000,
      UCC_FAST_DIAGNOSTIC_LOOP_BACK_AND_ECHO = 0xC0000000
};

/* UCC fast Sync length (transparent mode only) */
enum ucc_fast_sync_len {
      UCC_FAST_SYNC_LEN_NOT_USED = 0x0,
      UCC_FAST_SYNC_LEN_AUTOMATIC = 0x00004000,
      UCC_FAST_SYNC_LEN_8_BIT = 0x00008000,
      UCC_FAST_SYNC_LEN_16_BIT = 0x0000C000
};

/* UCC fast RTS mode */
enum ucc_fast_ready_to_send {
      UCC_FAST_SEND_IDLES_BETWEEN_FRAMES = 0x00000000,
      UCC_FAST_SEND_FLAGS_BETWEEN_FRAMES = 0x00002000
};

/* UCC fast receiver decoding mode */
enum ucc_fast_rx_decoding_method {
      UCC_FAST_RX_ENCODING_NRZ = 0x00000000,
      UCC_FAST_RX_ENCODING_NRZI = 0x00000800,
      UCC_FAST_RX_ENCODING_RESERVED0 = 0x00001000,
      UCC_FAST_RX_ENCODING_RESERVED1 = 0x00001800
};

/* UCC fast transmitter encoding mode */
enum ucc_fast_tx_encoding_method {
      UCC_FAST_TX_ENCODING_NRZ = 0x00000000,
      UCC_FAST_TX_ENCODING_NRZI = 0x00000100,
      UCC_FAST_TX_ENCODING_RESERVED0 = 0x00000200,
      UCC_FAST_TX_ENCODING_RESERVED1 = 0x00000300
};

/* UCC fast CRC length */
enum ucc_fast_transparent_tcrc {
      UCC_FAST_16_BIT_CRC = 0x00000000,
      UCC_FAST_CRC_RESERVED0 = 0x00000040,
      UCC_FAST_32_BIT_CRC = 0x00000080,
      UCC_FAST_CRC_RESERVED1 = 0x000000C0
};

/* Fast UCC initialization structure */
struct ucc_fast_info {
      int ucc_num;
      enum qe_clock rx_clock;
      enum qe_clock tx_clock;
      u32 regs;
      int irq;
      u32 uccm_mask;
      int bd_mem_part;
      int brkpt_support;
      int grant_support;
      int tsa;
      int cdp;
      int cds;
      int ctsp;
      int ctss;
      int tci;
      int txsy;
      int rtsm;
      int revd;
      int rsyn;
      u16 max_rx_buf_length;
      u16 urfs;
      u16 urfet;
      u16 urfset;
      u16 utfs;
      u16 utfet;
      u16 utftt;
      u16 ufpt;
      enum ucc_fast_channel_protocol_mode mode;
      enum ucc_fast_transparent_txrx ttx_trx;
      enum ucc_fast_tx_encoding_method tenc;
      enum ucc_fast_rx_decoding_method renc;
      enum ucc_fast_transparent_tcrc tcrc;
      enum ucc_fast_sync_len synl;
};

struct ucc_fast_private {
      struct ucc_fast_info *uf_info;
      struct ucc_fast __iomem *uf_regs; /* a pointer to the UCC regs. */
      u32 __iomem *p_ucce;    /* a pointer to the event register in memory. */
      u32 __iomem *p_uccm;    /* a pointer to the mask register in memory. */
#ifdef CONFIG_UGETH_TX_ON_DEMAND
      u16 __iomem *p_utodr;   /* pointer to the transmit on demand register */
#endif
      int enabled_tx;         /* Whether channel is enabled for Tx (ENT) */
      int enabled_rx;         /* Whether channel is enabled for Rx (ENR) */
      int stopped_tx;         /* Whether channel has been stopped for Tx
                           (STOP_TX, etc.) */
      int stopped_rx;         /* Whether channel has been stopped for Rx */
      u32 ucc_fast_tx_virtual_fifo_base_offset;/* pointer to base of Tx
                                        virtual fifo */
      u32 ucc_fast_rx_virtual_fifo_base_offset;/* pointer to base of Rx
                                        virtual fifo */
#ifdef STATISTICS
      u32 tx_frames;          /* Transmitted frames counter. */
      u32 rx_frames;          /* Received frames counter (only frames
                           passed to application). */
      u32 tx_discarded; /* Discarded tx frames counter (frames that
                           were discarded by the driver due to errors).
                           */
      u32 rx_discarded; /* Discarded rx frames counter (frames that
                           were discarded by the driver due to errors).
                           */
#endif                        /* STATISTICS */
      u16 mrblr;        /* maximum receive buffer length */
};

/* ucc_fast_init
 * Initializes Fast UCC according to user provided parameters.
 *
 * uf_info  - (In) pointer to the fast UCC info structure.
 * uccf_ret - (Out) pointer to the fast UCC structure.
 */
int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** uccf_ret);

/* ucc_fast_free
 * Frees all resources for fast UCC.
 *
 * uccf - (In) pointer to the fast UCC structure.
 */
void ucc_fast_free(struct ucc_fast_private * uccf);

/* ucc_fast_enable
 * Enables a fast UCC port.
 * This routine enables Tx and/or Rx through the General UCC Mode Register.
 *
 * uccf - (In) pointer to the fast UCC structure.
 * mode - (In) TX, RX, or both.
 */
void ucc_fast_enable(struct ucc_fast_private * uccf, enum comm_dir mode);

/* ucc_fast_disable
 * Disables a fast UCC port.
 * This routine disables Tx and/or Rx through the General UCC Mode Register.
 *
 * uccf - (In) pointer to the fast UCC structure.
 * mode - (In) TX, RX, or both.
 */
void ucc_fast_disable(struct ucc_fast_private * uccf, enum comm_dir mode);

/* ucc_fast_irq
 * Handles interrupts on fast UCC.
 * Called from the general interrupt routine to handle interrupts on fast UCC.
 *
 * uccf - (In) pointer to the fast UCC structure.
 */
void ucc_fast_irq(struct ucc_fast_private * uccf);

/* ucc_fast_transmit_on_demand
 * Immediately forces a poll of the transmitter for data to be sent.
 * Typically, the hardware performs a periodic poll for data that the
 * transmit routine has set up to be transmitted. In cases where
 * this polling cycle is not soon enough, this optional routine can
 * be invoked to force a poll right away, instead. Proper use for
 * each transmission for which this functionality is desired is to
 * call the transmit routine and then this routine right after.
 *
 * uccf - (In) pointer to the fast UCC structure.
 */
void ucc_fast_transmit_on_demand(struct ucc_fast_private * uccf);

u32 ucc_fast_get_qe_cr_subblock(int uccf_num);

void ucc_fast_dump_regs(struct ucc_fast_private * uccf);

#endif                        /* __UCC_FAST_H__ */

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