pc300_drv.c

优龙2410linux2.6.8内核源代码

#define	USE_PCI_CLOCK
static char rcsid[] = 
"Revision: 3.4.5 Date: 2002/03/07 ";

/*
 * pc300.c	Cyclades-PC300(tm) Driver.
 *
 * Author:	Ivan Passos <[e-mail]>
 * Maintainer:	PC300 Maintainer <[e-mail]>
 *
 * 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_OTHER

static 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_MLPPP
void 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 *ptdescr = (pcsca_bd_t *) (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 *ptdescr = (pcsca_bd_t *) (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 *ptdescr = (pcsca_bd_t *) (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 *ptdescr = (pcsca_bd_t *) (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 *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 = (pcsca_bd_t *) (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 = (pcsca_bd_t *) (card->hw.rambase + TX_BD_ADDR(ch, i))) {
		printk("\n CH%d TX%d: next=0x%lx, ptbuf=0x%lx, ST=0x%x, len=%d",
		       ch, i, (uclong) cpc_readl(&ptdescr->next),
		       (uclong) 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 *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%08lx, TX_EDA=0x%08lx\n",