cyclades.c

powerpc内核mpc8241linux系统下char驱动程序

 * Revision 1.34  1994/12/10  12:37:12  steffen
 * This is the corrected version as suggested by Marcio Saito
 *
 * Revision 1.33  1994/12/01  22:41:18  bentson
 * add hooks to support more high speeds directly; add tytso
 * patch regarding CLOCAL wakeups
 *
 * Revision 1.32  1994/11/23  19:50:04  bentson
 * allow direct kernel control of higher signalling rates;
 * look for cards at additional locations
 *
 * Revision 1.31  1994/11/16  04:33:28  bentson
 * ANOTHER fix from Corey Minyard, [e-mail]--
 * a problem in chars_in_buffer has been resolved by some
 * small changes;  this should yield smoother output
 *
 * Revision 1.30  1994/11/16  04:28:05  bentson
 * Fix from Corey Minyard, Internet: [e-mail],
 * UUCP: [e-mail], WORK: minyardbnr.ca, to
 * cy_hangup that appears to clear up much (all?) of the
 * DTR glitches; also he's added/cleaned-up diagnostic messages
 *
 * Revision 1.29  1994/11/16  04:16:07  bentson
 * add change proposed by Ralph Sims, [e-mail], to
 * operate higher speeds in same way as other serial ports;
 * add more serial ports (for up to two 16-port muxes).
 *
 * Revision 1.28  1994/11/04  00:13:16  root
 * turn off diagnostic messages
 *
 * Revision 1.27  1994/11/03  23:46:37  root
 * bunch of changes to bring driver into greater conformance
 * with the serial.c driver (looking for missed fixes)
 *
 * Revision 1.26  1994/11/03  22:40:36  root
 * automatic interrupt probing fixed.
 *
 * Revision 1.25  1994/11/03  20:17:02  root
 * start to implement auto-irq
 *
 * Revision 1.24  1994/11/03  18:01:55  root
 * still working on modem signals--trying not to drop DTR
 * during the getty/login processes
 *
 * Revision 1.23  1994/11/03  17:51:36  root
 * extend baud rate support; set receive threshold as function
 * of baud rate; fix some problems with RTS/CTS;
 *
 * Revision 1.22  1994/11/02  18:05:35  root
 * changed arguments to udelay to type long to get
 * delays to be of correct duration
 *
 * Revision 1.21  1994/11/02  17:37:30  root
 * employ udelay (after calibrating loops_per_second earlier
 * in init/main.c) instead of using home-grown delay routines
 *
 * Revision 1.20  1994/11/02  03:11:38  root
 * cy_chars_in_buffer forces a return value of 0 to let
 * login work (don't know why it does); some functions
 * that were returning EFAULT, now executes the code;
 * more work on deciding when to disable xmit interrupts;
 *
 * Revision 1.19  1994/11/01  20:10:14  root
 * define routine to start transmission interrupts (by enabling
 * transmit interrupts); directly enable/disable modem interrupts;
 *
 * Revision 1.18  1994/11/01  18:40:45  bentson
 * Don't always enable transmit interrupts in startup; interrupt on
 * TxMpty instead of TxRdy to help characters get out before shutdown;
 * restructure xmit interrupt to check for chars first and quit if
 * none are ready to go; modem status (MXVRx) is upright, _not_ inverted
 * (to my view);
 *
 * Revision 1.17  1994/10/30  04:39:45  bentson
 * rename serial_driver and callout_driver to cy_serial_driver and
 * cy_callout_driver to avoid linkage interference; initialize
 * info->type to PORT_CIRRUS; ruggedize paranoia test; elide ->port
 * from cyclades_port structure; add paranoia check to cy_close;
 *
 * Revision 1.16  1994/10/30  01:14:33  bentson
 * change major numbers; add some _early_ return statements;
 *
 * Revision 1.15  1994/10/29  06:43:15  bentson
 * final tidying up for clean compile;  enable some error reporting
 *
 * Revision 1.14  1994/10/28  20:30:22  Bentson
 * lots of changes to drag the driver towards the new tty_io
 * structures and operation.  not expected to work, but may
 * compile cleanly.
 *
 * Revision 1.13  1994/07/21  23:08:57  Bentson
 * add some diagnostic cruft; support 24 lines (for testing
 * both -8Y and -16Y cards; be more thorough in servicing all
 * chips during interrupt; add "volatile" a few places to
 * circumvent compiler optimizations; fix base & offset
 * computations in block_til_ready (was causing chip 0 to
 * stop operation)
 *
 * Revision 1.12  1994/07/19  16:42:11  Bentson
 * add some hackery for kernel version 1.1.8; expand
 * error messages; refine timing for delay loops and
 * declare loop params volatile
 *
 * Revision 1.11  1994/06/11  21:53:10  bentson
 * get use of save_car right in transmit interrupt service
 *
 * Revision 1.10.1.1  1994/06/11  21:31:18  bentson
 * add some diagnostic printing; try to fix save_car stuff
 *
 * Revision 1.10  1994/06/11  20:36:08  bentson
 * clean up compiler warnings
 *
 * Revision 1.9  1994/06/11  19:42:46  bentson
 * added a bunch of code to support modem signalling
 *
 * Revision 1.8  1994/06/11  17:57:07  bentson
 * recognize break & parity error
 *
 * Revision 1.7  1994/06/05  05:51:34  bentson
 * Reorder baud table to be monotonic; add cli to CP; discard
 * incoming characters and status if the line isn't open; start to
 * fold code into cy_throttle; start to port get_serial_info,
 * set_serial_info, get_modem_info, set_modem_info, and send_break
 * from serial.c; expand cy_ioctl; relocate and expand config_setup;
 * get flow control characters from tty struct; invalidate ports w/o
 * hardware;
 *
 * Revision 1.6  1994/05/31  18:42:21  bentson
 * add a loop-breaker in the interrupt service routine;
 * note when port is initialized so that it can be shut
 * down under the right conditions; receive works without
 * any obvious errors
 *
 * Revision 1.5  1994/05/30  00:55:02  bentson
 * transmit works without obvious errors
 *
 * Revision 1.4  1994/05/27  18:46:27  bentson
 * incorporated more code from lib_y.c; can now print short
 * strings under interrupt control to port zero; seems to
 * select ports/channels/lines correctly
 *
 * Revision 1.3  1994/05/25  22:12:44  bentson
 * shifting from multi-port on a card to proper multiplexor
 * data structures;  added skeletons of most routines
 *
 * Revision 1.2  1994/05/19  13:21:43  bentson
 * start to crib from other sources
 *
 */

/* If you need to install more boards than NR_CARDS, change the constant
   in the definition below. No other change is necessary to support up to
   eight boards. Beyond that you'll have to extend cy_isa_addresses. */

#define NR_CARDS        4

/*
   If the total number of ports is larger than NR_PORTS, change this
   constant in the definition below. No other change is necessary to
   support more boards/ports. */

#define NR_PORTS        128

#define ZE_V1_NPORTS	64
#define ZO_V1	0
#define ZO_V2	1
#define ZE_V1	2

#define	SERIAL_PARANOIA_CHECK
#undef	CY_DEBUG_OPEN
#undef	CY_DEBUG_THROTTLE
#undef	CY_DEBUG_OTHER
#undef	CY_DEBUG_IO
#undef	CY_DEBUG_COUNT
#undef	CY_DEBUG_DTR
#undef	CY_DEBUG_WAIT_UNTIL_SENT
#undef	CY_DEBUG_INTERRUPTS
#undef	CY_16Y_HACK
#undef	CY_ENABLE_MONITORING
#undef	CY_PCI_DEBUG
#define	CY_PROC

#if 0
#define PAUSE __asm__("nop");
#else
#define PAUSE ;
#endif

#define cy_min(a,b) (((a)<(b))?(a):(b))

#if 0
/******** 
 * For the next two macros, it is assumed that the buffer size is a 
 * power of 2 
 ********/

#define CHARS_IN_BUF(buf_ctrl) \
    ((cy_readl(&buf_ctrl->rx_put) - \
      cy_readl(&buf_ctrl->rx_get) + \
      cy_readl(&buf_ctrl->rx_bufsize)) & \
		  (cy_readl(&buf_ctrl->rx_bufsize) - 1))

#define SPACE_IN_BUF(buf_ctrl) \
    ((cy_readl(&buf_ctrl->tx_get) - \
      cy_readl(&buf_ctrl->tx_put) + \
      cy_readl(&buf_ctrl->tx_bufsize) - 1) & \
		  (cy_readl(&buf_ctrl->tx_bufsize) - 1))
#endif

/*
 * Include section 
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/cyclades.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/version.h>

#include <linux/stat.h>
#include <linux/proc_fs.h>

#define cy_put_user	put_user

static unsigned long cy_get_user(unsigned long *addr)
{
	unsigned long result = 0;
	int error = get_user (result, addr);
	if (error)
		printk ("cyclades: cy_get_user: error == %d\n", error);
	return result;
}

#ifndef MIN
#define MIN(a,b)        ((a) < (b) ? (a) : (b))
#endif

#define IS_CYC_Z(card) ((card).num_chips == -1)

#define Z_FPGA_CHECK(card) \
    ((cy_readl(&((struct RUNTIME_9060 *) \
		 ((card).ctl_addr))->init_ctrl) & (1<<17)) != 0)

#define ISZLOADED(card)	(((ZO_V1==cy_readl(&((struct RUNTIME_9060 *) \
			((card).ctl_addr))->mail_box_0)) || \
			Z_FPGA_CHECK(card)) && \
			(ZFIRM_ID==cy_readl(&((struct FIRM_ID *) \
			((card).base_addr+ID_ADDRESS))->signature)))

#define WAKEUP_CHARS (SERIAL_XMIT_SIZE-256)

#define STD_COM_FLAGS (0)

#define	JIFFIES_DIFF(n, j)	((j) - (n))

static DECLARE_TASK_QUEUE(tq_cyclades);

static struct tty_driver cy_serial_driver, cy_callout_driver;
static int serial_refcount;

static volatile int cy_irq_triggered;
static volatile int cy_triggered;
static int cy_wild_int_mask;
static volatile ucchar *intr_base_addr;

/* This is the address lookup table. The driver will probe for
   Cyclom-Y/ISA boards at all addresses in here. If you want the
   driver to probe addresses at a different address, add it to
   this table.  If the driver is probing some other board and
   causing problems, remove the offending address from this table.
   The cy_setup function extracts additional addresses from the
   boot options line.  The form is "cyclades=address,address..."
*/

static unsigned char *cy_isa_addresses[] = {
        (unsigned char *) 0xD0000,
        (unsigned char *) 0xD2000,
        (unsigned char *) 0xD4000,
        (unsigned char *) 0xD6000,
        (unsigned char *) 0xD8000,
        (unsigned char *) 0xDA000,
        (unsigned char *) 0xDC000,
        (unsigned char *) 0xDE000,
        0,0,0,0,0,0,0,0
};
#define NR_ISA_ADDRS (sizeof(cy_isa_addresses)/sizeof(unsigned char*))

/* This is the per-card data structure containing address, irq, number of
   channels, etc. This driver supports a maximum of NR_CARDS cards.
*/
static struct cyclades_card cy_card[NR_CARDS];

/* This is the per-channel data structure containing pointers, flags
 and variables for the port. This driver supports a maximum of NR_PORTS.
*/
static struct cyclades_port cy_port[NR_PORTS];

static int cy_next_channel = 0; /* next minor available */

static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];

/* This is the per-irq data structure,
   it maps an irq to the corresponding card */

static struct cyclades_card     *IRQ_cards[NR_IRQS];

/*
 * tmp_buf is used as a temporary buffer by serial_write.  We need to
 * lock it in case the copy_from_user blocks while swapping in a page,
 * and some other program tries to do a serial write at the same time.
 * Since the lock will only come under contention when the system is
 * swapping and available memory is low, it makes sense to share one
 * buffer across all the serial ports, since it significantly saves
 * memory if large numbers of serial ports are open.  This buffer is
 * allocated when the first cy_open occurs.
 */
static unsigned char *tmp_buf;
static struct semaphore tmp_buf_sem = MUTEX;

/*
 * This is used to look up the divisor speeds and the timeouts
 * We're normally limited to 15 distinct baud rates.  The extra
 * are accessed via settings in info->flags.
 *      0,     1,     2,     3,     4,     5,     6,     7,     8,     9,
 *     10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
 *                                               HI            VHI
 *     20
 */
static int baud_table[] = {
       0,    50,    75,   110,   134,   150,   200,   300,   600,  1200,
    1800,  2400,  4800,  9600, 19200, 38400, 57600, 76800,115200,150000,
  230400,     0};

static char baud_co_25[] = {  /* 25 MHz clock option table */