#define	USE_PCI_CLOCKstatic char rcsid[] = "Revision: 3.4.5 Date: 2002/03/07 ";/* * pc300.c	Cyclades-PC300(tm) Driver. * * Author:	Ivan Passos <ivan@cyclades.com> * Maintainer:	PC300 Maintainer <pc300@cyclades.com> * * Copyright:	(c) 1999-2003 Cyclades Corp. * *	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. *	 *	Using tabstop = 4. *  * $Log: pc300_drv.c,v $ * Revision 3.23  2002/03/20 13:58:40  henrique * Fixed ortographic mistakes * * Revision 3.22  2002/03/13 16:56:56  henrique * Take out the debug messages * * Revision 3.21  2002/03/07 14:17:09  henrique * License data fixed * * Revision 3.20  2002/01/17 17:58:52  ivan * Support for PC300-TE/M (PMC). * * Revision 3.19  2002/01/03 17:08:47  daniela * Enables DMA reception when the SCA-II disables it improperly. * * Revision 3.18  2001/12/03 18:47:50  daniela * Esthetic changes. * * Revision 3.17  2001/10/19 16:50:13  henrique * Patch to kernel 2.4.12 and new generic hdlc. * * Revision 3.16  2001/10/16 15:12:31  regina * clear statistics * * Revision 3.11 to 3.15  2001/10/11 20:26:04  daniela * More DMA fixes for noisy lines. * Return the size of bad frames in dma_get_rx_frame_size, so that the Rx buffer * descriptors can be cleaned by dma_buf_read (called in cpc_net_rx). * Renamed dma_start routine to rx_dma_start. Improved Rx statistics. * Fixed BOF interrupt treatment. Created dma_start routine. * Changed min and max to cpc_min and cpc_max. * * Revision 3.10  2001/08/06 12:01:51  regina * Fixed problem in DSR_DE bit. * * Revision 3.9  2001/07/18 19:27:26  daniela * Added some history comments. * * Revision 3.8  2001/07/12 13:11:19  regina * bug fix - DCD-OFF in pc300 tty driver * * Revision 3.3 to 3.7  2001/07/06 15:00:20  daniela * Removing kernel 2.4.3 and previous support. * DMA transmission bug fix. * MTU check in cpc_net_rx fixed. * Boot messages reviewed. * New configuration parameters (line code, CRC calculation and clock). * * Revision 3.2 2001/06/22 13:13:02  regina * MLPPP implementation. Changed the header of message trace to include * the device name. New format : "hdlcX[R/T]: ". * Default configuration changed. * * Revision 3.1 2001/06/15 regina * in cpc_queue_xmit, netif_stop_queue is called if don't have free descriptor * upping major version number * * Revision 1.1.1.1  2001/06/13 20:25:04  daniela * PC300 initial CVS version (3.4.0-pre1) * * Revision 3.0.1.2 2001/06/08 daniela * Did some changes in the DMA programming implementation to avoid the  * occurrence of a SCA-II bug when CDA is accessed during a DMA transfer. * * Revision 3.0.1.1 2001/05/02 daniela * Added kernel 2.4.3 support. *  * Revision 3.0.1.0 2001/03/13 daniela, henrique * Added Frame Relay Support. * Driver now uses HDLC generic driver to provide protocol support. *  * Revision 3.0.0.8 2001/03/02 daniela * Fixed ram size detection.  * Changed SIOCGPC300CONF ioctl, to give hw information to pc300util. *  * Revision 3.0.0.7 2001/02/23 daniela * netif_stop_queue called before the SCA-II transmition commands in  * cpc_queue_xmit, and with interrupts disabled to avoid race conditions with  * transmition interrupts. * Fixed falc_check_status for Unframed E1. *  * Revision 3.0.0.6 2000/12/13 daniela * Implemented pc300util support: trace, statistics, status and loopback * tests for the PC300 TE boards. *  * Revision 3.0.0.5 2000/12/12 ivan * Added support for Unframed E1. * Implemented monitor mode. * Fixed DCD sensitivity on the second channel. * Driver now complies with new PCI kernel architecture. * * Revision 3.0.0.4 2000/09/28 ivan * Implemented DCD sensitivity. * Moved hardware-specific open to the end of cpc_open, to avoid race * conditions with early reception interrupts. * Included code for [request|release]_mem_region(). * Changed location of pc300.h . * Minor code revision (contrib. of Jeff Garzik). * * Revision 3.0.0.3 2000/07/03 ivan * Previous bugfix for the framing errors with external clock made X21 * boards stop working. This version fixes it. * * Revision 3.0.0.2 2000/06/23 ivan * Revisited cpc_queue_xmit to prevent race conditions on Tx DMA buffer * handling when Tx timeouts occur. * Revisited Rx statistics. * Fixed a bug in the SCA-II programming that would cause framing errors * when external clock was configured. * * Revision 3.0.0.1 2000/05/26 ivan * Added logic in the SCA interrupt handler so that no board can monopolize * the driver. * Request PLX I/O region, although driver doesn't use it, to avoid * problems with other drivers accessing it. * * Revision 3.0.0.0 2000/05/15 ivan * Did some changes in the DMA programming implementation to avoid the * occurrence of a SCA-II bug in the second channel. * Implemented workaround for PLX9050 bug that would cause a system lockup * in certain systems, depending on the MMIO addresses allocated to the * board. * Fixed the FALC chip programming to avoid synchronization problems in the * second channel (TE only). * Implemented a cleaner and faster Tx DMA descriptor cleanup procedure in * cpc_queue_xmit(). * Changed the built-in driver implementation so that the driver can use the * general 'hdlcN' naming convention instead of proprietary device names. * Driver load messages are now device-centric, instead of board-centric. * Dynamic allocation of net_device structures. * Code is now compliant with the new module interface (module_[init|exit]). * Make use of the PCI helper functions to access PCI resources. * * Revision 2.0.0.0 2000/04/15 ivan * Added support for the PC300/TE boards (T1/FT1/E1/FE1). * * Revision 1.1.0.0 2000/02/28 ivan * Major changes in the driver architecture. * Softnet compliancy implemented. * Driver now reports physical instead of virtual memory addresses. * Added cpc_change_mtu function. * * Revision 1.0.0.0 1999/12/16 ivan * First official release. * Support for 1- and 2-channel boards (which use distinct PCI Device ID's). * Support for monolythic installation (i.e., drv built into the kernel). * X.25 additional checking when lapb_[dis]connect_request returns an error. * SCA programming now covers X.21 as well. * * Revision 0.3.1.0 1999/11/18 ivan * Made X.25 support configuration-dependent (as it depends on external  * modules to work). * Changed X.25-specific function names to comply with adopted convention. * Fixed typos in X.25 functions that would cause compile errors (Daniela). * Fixed bug in ch_config that would disable interrupts on a previously  * enabled channel if the other channel on the same board was enabled later. * * Revision 0.3.0.0 1999/11/16 daniela * X.25 support. * * Revision 0.2.3.0 1999/11/15 ivan * Function cpc_ch_status now provides more detailed information. * Added support for X.21 clock configuration. * Changed TNR1 setting in order to prevent Tx FIFO overaccesses by the SCA. * Now using PCI clock instead of internal oscillator clock for the SCA. * * Revision 0.2.2.0 1999/11/10 ivan * Changed the *_dma_buf_check functions so that they would print only  * the useful info instead of the whole buffer descriptor bank. * Fixed bug in cpc_queue_xmit that would eventually crash the system  * in case of a packet drop. * Implemented TX underrun handling. * Improved SCA fine tuning to boost up its performance. * * Revision 0.2.1.0 1999/11/03 ivan * Added functions *dma_buf_pt_init to allow independent initialization  * of the next-descr. and DMA buffer pointers on the DMA descriptors. * Kernel buffer release and tbusy clearing is now done in the interrupt  * handler. * Fixed bug in cpc_open that would cause an interface reopen to fail. * Added a protocol-specific code section in cpc_net_rx. * Removed printk level defs (they might be added back after the beta phase). * * Revision 0.2.0.0 1999/10/28 ivan * Revisited the code so that new protocols can be easily added / supported.  * * Revision 0.1.0.1 1999/10/20 ivan * Mostly "esthetic" changes. * * Revision 0.1.0.0 1999/10/11 ivan * Initial version. * */#include <linux/module.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/ioport.h>#include <linux/pci.h>#include <linux/errno.h>#include <linux/string.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/net.h>#include <linux/skbuff.h>#include <linux/if_arp.h>#include <linux/netdevice.h>#include <linux/spinlock.h>#include <linux/if.h>#include <net/syncppp.h>#include <net/arp.h>#include <asm/io.h>#include <asm/uaccess.h>#include "pc300.h"#define	CPC_LOCK(card,flags)		\		do {						\		spin_lock_irqsave(&card->card_lock, flags);	\		} while (0)#define CPC_UNLOCK(card,flags)			\		do {							\		spin_unlock_irqrestore(&card->card_lock, flags);	\		} while (0)#undef	PC300_DEBUG_PCI#undef	PC300_DEBUG_INTR#undef	PC300_DEBUG_TX#undef	PC300_DEBUG_RX#undef	PC300_DEBUG_OTHERstatic struct pci_device_id cpc_pci_dev_id[] __devinitdata = {	/* PC300/RSV or PC300/X21, 2 chan */	{0x120e, 0x300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x300},	/* PC300/RSV or PC300/X21, 1 chan */	{0x120e, 0x301, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x301},	/* PC300/TE, 2 chan */	{0x120e, 0x310, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x310},	/* PC300/TE, 1 chan */	{0x120e, 0x311, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x311},	/* PC300/TE-M, 2 chan */	{0x120e, 0x320, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x320},	/* PC300/TE-M, 1 chan */	{0x120e, 0x321, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0x321},	/* End of table */	{0,},};MODULE_DEVICE_TABLE(pci, cpc_pci_dev_id);#ifndef cpc_min#define	cpc_min(a,b)	(((a)<(b))?(a):(b))#endif#ifndef cpc_max#define	cpc_max(a,b)	(((a)>(b))?(a):(b))#endif/* prototypes */static void tx_dma_buf_pt_init(pc300_t *, int);static void tx_dma_buf_init(pc300_t *, int);static void rx_dma_buf_pt_init(pc300_t *, int);static void rx_dma_buf_init(pc300_t *, int);static void tx_dma_buf_check(pc300_t *, int);static void rx_dma_buf_check(pc300_t *, int);static irqreturn_t cpc_intr(int, void *, struct pt_regs *);static struct net_device_stats *cpc_get_stats(struct net_device *);static int clock_rate_calc(uclong, uclong, int *);static uclong detect_ram(pc300_t *);static void plx_init(pc300_t *);static void cpc_trace(struct net_device *, struct sk_buff *, char);static int cpc_attach(struct net_device *, unsigned short, unsigned short);#ifdef CONFIG_PC300_MLPPPvoid cpc_tty_init(pc300dev_t * dev);void cpc_tty_unregister_service(pc300dev_t * pc300dev);void cpc_tty_receive(pc300dev_t * pc300dev);void cpc_tty_trigger_poll(pc300dev_t * pc300dev);void cpc_tty_reset_var(void);#endif/************************//***   DMA Routines   ***//************************/static void tx_dma_buf_pt_init(pc300_t * card, int ch){	int i;	int ch_factor = ch * N_DMA_TX_BUF;	volatile pcsca_bd_t __iomem *ptdescr = (card->hw.rambase			               + DMA_TX_BD_BASE + ch_factor * sizeof(pcsca_bd_t));	for (i = 0; i < N_DMA_TX_BUF; i++, ptdescr++) {		cpc_writel(&ptdescr->next, (uclong) (DMA_TX_BD_BASE +			(ch_factor + ((i + 1) & (N_DMA_TX_BUF - 1))) * sizeof(pcsca_bd_t)));		cpc_writel(&ptdescr->ptbuf, 						(uclong) (DMA_TX_BASE + (ch_factor + i) * BD_DEF_LEN));	}}static void tx_dma_buf_init(pc300_t * card, int ch){	int i;	int ch_factor = ch * N_DMA_TX_BUF;	volatile pcsca_bd_t __iomem *ptdescr = (card->hw.rambase			       + DMA_TX_BD_BASE + ch_factor * sizeof(pcsca_bd_t));	for (i = 0; i < N_DMA_TX_BUF; i++, ptdescr++) {		memset_io(ptdescr, 0, sizeof(pcsca_bd_t));		cpc_writew(&ptdescr->len, 0);		cpc_writeb(&ptdescr->status, DST_OSB);	}	tx_dma_buf_pt_init(card, ch);}static void rx_dma_buf_pt_init(pc300_t * card, int ch){	int i;	int ch_factor = ch * N_DMA_RX_BUF;	volatile pcsca_bd_t __iomem *ptdescr = (card->hw.rambase				       + DMA_RX_BD_BASE + ch_factor * sizeof(pcsca_bd_t));	for (i = 0; i < N_DMA_RX_BUF; i++, ptdescr++) {		cpc_writel(&ptdescr->next, (uclong) (DMA_RX_BD_BASE +	     	(ch_factor + ((i + 1) & (N_DMA_RX_BUF - 1))) * sizeof(pcsca_bd_t)));		cpc_writel(&ptdescr->ptbuf,			   (uclong) (DMA_RX_BASE + (ch_factor + i) * BD_DEF_LEN));	}}static void rx_dma_buf_init(pc300_t * card, int ch){	int i;	int ch_factor = ch * N_DMA_RX_BUF;	volatile pcsca_bd_t __iomem *ptdescr = (card->hw.rambase				       + DMA_RX_BD_BASE + ch_factor * sizeof(pcsca_bd_t));	for (i = 0; i < N_DMA_RX_BUF; i++, ptdescr++) {		memset_io(ptdescr, 0, sizeof(pcsca_bd_t));		cpc_writew(&ptdescr->len, 0);		cpc_writeb(&ptdescr->status, 0);	}	rx_dma_buf_pt_init(card, ch);}static void tx_dma_buf_check(pc300_t * card, int ch){	volatile pcsca_bd_t __iomem *ptdescr;	int i;	ucshort first_bd = card->chan[ch].tx_first_bd;	ucshort next_bd = card->chan[ch].tx_next_bd;	printk("#CH%d: f_bd = %d(0x%08zx), n_bd = %d(0x%08zx)\n", ch,	       first_bd, TX_BD_ADDR(ch, first_bd),	       next_bd, TX_BD_ADDR(ch, next_bd));	for (i = first_bd,	     ptdescr = (card->hw.rambase + TX_BD_ADDR(ch, first_bd));	     i != ((next_bd + 1) & (N_DMA_TX_BUF - 1));	     i = (i + 1) & (N_DMA_TX_BUF - 1), 		 ptdescr = (card->hw.rambase + TX_BD_ADDR(ch, i))) {		printk("\n CH%d TX%d: next=0x%x, ptbuf=0x%x, ST=0x%x, len=%d",		       ch, i, cpc_readl(&ptdescr->next),		       cpc_readl(&ptdescr->ptbuf),		       cpc_readb(&ptdescr->status), cpc_readw(&ptdescr->len));	}	printk("\n");}#ifdef	PC300_DEBUG_OTHER/* Show all TX buffer descriptors */static void tx1_dma_buf_check(pc300_t * card, int ch){	volatile pcsca_bd_t __iomem *ptdescr;	int i;	ucshort first_bd = card->chan[ch].tx_first_bd;	ucshort next_bd = card->chan[ch].tx_next_bd;	uclong scabase = card->hw.scabase;	printk ("\nnfree_tx_bd = %d \n", card->chan[ch].nfree_tx_bd);	printk("#CH%d: f_bd = %d(0x%08x), n_bd = %d(0x%08x)\n", ch,	       first_bd, TX_BD_ADDR(ch, first_bd),	       next_bd, TX_BD_ADDR(ch, next_bd));	printk("TX_CDA=0x%08x, TX_EDA=0x%08x\n",