/*
 * Cirrus Logic CS8900A Ethernet
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * Copyright (C) 1999 Ben Williamson <benw@pobox.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is loaded into SRAM in bootstrap mode, where it waits
 * for commands on UART1 to read and write memory, jump to code etc.
 * A design goal for this program is to be entirely independent of the
 * target board.  Anything with a CL-PS7111 or EP7211 should be able to run
 * this code in bootstrap mode.  All the board specifics can be handled on
 * the host.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <asm/types.h>
#include <config.h>

#ifdef CONFIG_DRIVER_CS8900

/* although the registers are 16 bit, they are 32-bit aligned on the
   EDB7111. so we have to read them as 32-bit registers and ignore the
   upper 16-bits. i'm not sure if this holds for the EDB7211. */

#ifdef CS8900_BUS16
  /* 16 bit aligned registers, 16 bit wide */
  #define CS8900_REG u16
  #define CS8900_OFF 0x02
  #define CS8900_BUS16_0  *(volatile u8 *)(CS8900_BASE+0x00)
  #define CS8900_BUS16_1  *(volatile u8 *)(CS8900_BASE+0x01)
#elif  CS8900_BUS32
  /* 32 bit aligned registers, 16 bit wide (we ignore upper 16 bits) */
  #define CS8900_REG u32
  #define CS8900_OFF 0x04
#else
  #error unknown bussize ...
#endif

#define CS8900_RTDATA *(volatile CS8900_REG *)(CS8900_BASE+0x00*CS8900_OFF)
#define CS8900_TxCMD  *(volatile CS8900_REG *)(CS8900_BASE+0x02*CS8900_OFF)
#define CS8900_TxLEN  *(volatile CS8900_REG *)(CS8900_BASE+0x03*CS8900_OFF)
#define CS8900_ISQ    *(volatile CS8900_REG *)(CS8900_BASE+0x04*CS8900_OFF)
#define CS8900_PPTR   *(volatile CS8900_REG *)(CS8900_BASE+0x05*CS8900_OFF)
#define CS8900_PDATA  *(volatile CS8900_REG *)(CS8900_BASE+0x06*CS8900_OFF)


#define ISQ_RxEvent     0x04
#define ISQ_TxEvent     0x08
#define ISQ_BufEvent    0x0C
#define ISQ_RxMissEvent 0x10
#define ISQ_TxColEvent  0x12
#define ISQ_EventMask   0x3F

/* packet page register offsets */

/* bus interface registers */
#define PP_ChipID    0x0000  /* Chip identifier - must be 0x630E */
#define PP_ChipRev   0x0002  /* Chip revision, model codes */

#define PP_IntReg    0x0022  /* Interrupt configuration */
#define PP_IntReg_IRQ0         0x0000  /* Use INTR0 pin */
#define PP_IntReg_IRQ1         0x0001  /* Use INTR1 pin */
#define PP_IntReg_IRQ2         0x0002  /* Use INTR2 pin */
#define PP_IntReg_IRQ3         0x0003  /* Use INTR3 pin */

/* status and control registers */

#define PP_RxCFG     0x0102  /* Receiver configuration */
#define PP_RxCFG_Skip1         0x0040  /* Skip (i.e. discard) current frame */
#define PP_RxCFG_Stream        0x0080  /* Enable streaming mode */
#define PP_RxCFG_RxOK          0x0100  /* RxOK interrupt enable */
#define PP_RxCFG_RxDMAonly     0x0200  /* Use RxDMA for all frames */
#define PP_RxCFG_AutoRxDMA     0x0400  /* Select RxDMA automatically */
#define PP_RxCFG_BufferCRC     0x0800  /* Include CRC characters in frame */
#define PP_RxCFG_CRC           0x1000  /* Enable interrupt on CRC error */
#define PP_RxCFG_RUNT          0x2000  /* Enable interrupt on RUNT frames */
#define PP_RxCFG_EXTRA         0x4000  /* Enable interrupt on frames with extra data */

#define PP_RxCTL     0x0104  /* Receiver control */
#define PP_RxCTL_IAHash        0x0040  /* Accept frames that match hash */
#define PP_RxCTL_Promiscuous   0x0080  /* Accept any frame */
#define PP_RxCTL_RxOK          0x0100  /* Accept well formed frames */
#define PP_RxCTL_Multicast     0x0200  /* Accept multicast frames */
#define PP_RxCTL_IA            0x0400  /* Accept frame that matches IA */
#define PP_RxCTL_Broadcast     0x0800  /* Accept broadcast frames */
#define PP_RxCTL_CRC           0x1000  /* Accept frames with bad CRC */
#define PP_RxCTL_RUNT          0x2000  /* Accept runt frames */
#define PP_RxCTL_EXTRA         0x4000  /* Accept frames that are too long */

#define PP_TxCFG     0x0106  /* Transmit configuration */
#define PP_TxCFG_CRS           0x0040  /* Enable interrupt on loss of carrier */
#define PP_TxCFG_SQE           0x0080  /* Enable interrupt on Signal Quality Error */
#define PP_TxCFG_TxOK          0x0100  /* Enable interrupt on successful xmits */
#define PP_TxCFG_Late          0x0200  /* Enable interrupt on "out of window" */
#define PP_TxCFG_Jabber        0x0400  /* Enable interrupt on jabber detect */
#define PP_TxCFG_Collision     0x0800  /* Enable interrupt if collision */
#define PP_TxCFG_16Collisions  0x8000  /* Enable interrupt if > 16 collisions */

#define PP_TxCmd     0x0108  /* Transmit command status */
#define PP_TxCmd_TxStart_5     0x0000  /* Start after 5 bytes in buffer */
#define PP_TxCmd_TxStart_381   0x0040  /* Start after 381 bytes in buffer */
#define PP_TxCmd_TxStart_1021  0x0080  /* Start after 1021 bytes in buffer */
#define PP_TxCmd_TxStart_Full  0x00C0  /* Start after all bytes loaded */
#define PP_TxCmd_Force         0x0100  /* Discard any pending packets */
#define PP_TxCmd_OneCollision  0x0200  /* Abort after a single collision */
#define PP_TxCmd_NoCRC         0x1000  /* Do not add CRC */
#define PP_TxCmd_NoPad         0x2000  /* Do not pad short packets */

#define PP_BufCFG    0x010A  /* Buffer configuration */
#define PP_BufCFG_SWI          0x0040  /* Force interrupt via software */
#define PP_BufCFG_RxDMA        0x0080  /* Enable interrupt on Rx DMA */
#define PP_BufCFG_TxRDY        0x0100  /* Enable interrupt when ready for Tx */
#define PP_BufCFG_TxUE         0x0200  /* Enable interrupt in Tx underrun */
#define PP_BufCFG_RxMiss       0x0400  /* Enable interrupt on missed Rx packets */
#define PP_BufCFG_Rx128        0x0800  /* Enable Rx interrupt after 128 bytes */
#define PP_BufCFG_TxCol        0x1000  /* Enable int on Tx collision ctr overflow */
#define PP_BufCFG_Miss         0x2000  /* Enable int on Rx miss ctr overflow */
#define PP_BufCFG_RxDest       0x8000  /* Enable int on Rx dest addr match */

#define PP_LineCTL   0x0112  /* Line control */
#define PP_LineCTL_Rx          0x0040  /* Enable receiver */
#define PP_LineCTL_Tx          0x0080  /* Enable transmitter */
#define PP_LineCTL_AUIonly     0x0100  /* AUI interface only */
#define PP_LineCTL_AutoAUI10BT 0x0200  /* Autodetect AUI or 10BaseT interface */
#define PP_LineCTL_ModBackoffE 0x0800  /* Enable modified backoff algorithm */
#define PP_LineCTL_PolarityDis 0x1000  /* Disable Rx polarity autodetect */
#define PP_LineCTL_2partDefDis 0x2000  /* Disable two-part defferal */
#define PP_LineCTL_LoRxSquelch 0x4000  /* Reduce receiver squelch threshold */

#define PP_SelfCTL   0x0114  /* Chip self control */
#define PP_SelfCTL_Reset       0x0040  /* Self-clearing reset */
#define PP_SelfCTL_SWSuspend   0x0100  /* Initiate suspend mode */
#define PP_SelfCTL_HWSleepE    0x0200  /* Enable SLEEP input */
#define PP_SelfCTL_HWStandbyE  0x0400  /* Enable standby mode */
#define PP_SelfCTL_HC0E        0x1000  /* use HCB0 for LINK LED */
#define PP_SelfCTL_HC1E        0x2000  /* use HCB1 for BSTATUS LED */
#define PP_SelfCTL_HCB0        0x4000  /* control LINK LED if HC0E set */
#define PP_SelfCTL_HCB1        0x8000  /* control BSTATUS LED if HC1E set */

#define PP_BusCTL    0x0116  /* Bus control */
#define PP_BusCTL_ResetRxDMA   0x0040  /* Reset RxDMA pointer */
#define PP_BusCTL_DMAextend    0x0100  /* Extend DMA cycle */
#define PP_BusCTL_UseSA        0x0200  /* Assert MEMCS16 on address decode */
#define PP_BusCTL_MemoryE      0x0400  /* Enable memory mode */
#define PP_BusCTL_DMAburst     0x0800  /* Limit DMA access burst */
#define PP_BusCTL_IOCHRDYE     0x1000  /* Set IOCHRDY high impedence */
#define PP_BusCTL_RxDMAsize    0x2000  /* Set DMA buffer size 64KB */
#define PP_BusCTL_EnableIRQ    0x8000  /* Generate interrupt on interrupt event */

#define PP_TestCTL   0x0118  /* Test control */
#define PP_TestCTL_DisableLT   0x0080  /* Disable link status */
#define PP_TestCTL_ENDECloop   0x0200  /* Internal loopback */
#define PP_TestCTL_AUIloop     0x0400  /* AUI loopback */
#define PP_TestCTL_DisBackoff  0x0800  /* Disable backoff algorithm */
#define PP_TestCTL_FDX         0x4000  /* Enable full duplex mode */

#define PP_ISQ       0x0120  /* Interrupt Status Queue */

#define PP_RER       0x0124  /* Receive event */
#define PP_RER_IAHash          0x0040  /* Frame hash match */
#define PP_RER_Dribble         0x0080  /* Frame had 1-7 extra bits after last byte */
#define PP_RER_RxOK            0x0100  /* Frame received with no errors */
#define PP_RER_Hashed          0x0200  /* Frame address hashed OK */
#define PP_RER_IA              0x0400  /* Frame address matched IA */
#define PP_RER_Broadcast       0x0800  /* Broadcast frame */
#define PP_RER_CRC             0x1000  /* Frame had CRC error */
#define PP_RER_RUNT            0x2000  /* Runt frame */
#define PP_RER_EXTRA           0x4000  /* Frame was too long */

#define PP_TER       0x0128 /* Transmit event */
#define PP_TER_CRS             0x0040  /* Carrier lost */
#define PP_TER_SQE             0x0080  /* Signal Quality Error */
#define PP_TER_TxOK            0x0100  /* Packet sent without error */
#define PP_TER_Late            0x0200  /* Out of window */
#define PP_TER_Jabber          0x0400  /* Stuck transmit? */
#define PP_TER_NumCollisions   0x7800  /* Number of collisions */
#define PP_TER_16Collisions    0x8000  /* > 16 collisions */

#define PP_BER       0x012C /* Buffer event */
#define PP_BER_SWint           0x0040 /* Software interrupt */
#define PP_BER_RxDMAFrame      0x0080 /* Received framed DMAed */
#define PP_BER_Rdy4Tx          0x0100 /* Ready for transmission */
#define PP_BER_TxUnderrun      0x0200 /* Transmit underrun */
#define PP_BER_RxMiss          0x0400 /* Received frame missed */
#define PP_BER_Rx128           0x0800 /* 128 bytes received */
#define PP_BER_RxDest          0x8000 /* Received framed passed address filter */

#define PP_RxMiss    0x0130  /*  Receiver miss counter */

#define PP_TxCol     0x0132  /*  Transmit collision counter */

#define PP_LineSTAT  0x0134  /* Line status */
#define PP_LineSTAT_LinkOK     0x0080  /* Line is connected and working */
#define PP_LineSTAT_AUI        0x0100  /* Connected via AUI */
#define PP_LineSTAT_10BT       0x0200  /* Connected via twisted pair */
#define PP_LineSTAT_Polarity   0x1000  /* Line polarity OK (10BT only) */
#define PP_LineSTAT_CRS        0x4000  /* Frame being received */

#define PP_SelfSTAT  0x0136  /* Chip self status */
#define PP_SelfSTAT_33VActive  0x0040  /* supply voltage is 3.3V */
#define PP_SelfSTAT_InitD      0x0080  /* Chip initialization complete */
#define PP_SelfSTAT_SIBSY      0x0100  /* EEPROM is busy */
#define PP_SelfSTAT_EEPROM     0x0200  /* EEPROM present */
#define PP_SelfSTAT_EEPROM_OK  0x0400  /* EEPROM checks out */
#define PP_SelfSTAT_ELPresent  0x0800  /* External address latch logic available */
#define PP_SelfSTAT_EEsize     0x1000  /* Size of EEPROM */

#define PP_BusSTAT   0x0138  /* Bus status */
#define PP_BusSTAT_TxBid       0x0080  /* Tx error */
#define PP_BusSTAT_TxRDY       0x0100  /* Ready for Tx data */

#define PP_TDR       0x013C  /* AUI Time Domain Reflectometer */

/* initiate transmit registers */

#define PP_TxCommand 0x0144  /* Tx Command */
#define PP_TxLength  0x0146  /* Tx Length */


/* address filter registers */

#define PP_LAF       0x0150  /* Logical address filter (6 bytes) */
#define PP_IA        0x0158  /* Individual address (MAC) */

/* EEPROM Kram */
#define SI_BUSY 0x0100
#define PP_SelfST 0x0136	/*  Self State register */
#define PP_EECMD 0x0040		/*  NVR Interface Command register */
#define PP_EEData 0x0042	/*  NVR Interface Data Register */
#define EEPROM_WRITE_EN		0x00F0
#define EEPROM_WRITE_DIS	0x0000
#define EEPROM_WRITE_CMD	0x0100
#define EEPROM_READ_CMD		0x0200
#define EEPROM_ERASE_CMD	0x0300

extern int cs8900_e2prom_read(uchar, ushort *);
extern void cs8900_e2prom_write(uchar, ushort);

#endif /* CONFIG_DRIVER_CS8900 */