patch-2.4.2 linux/arch/cris/drivers/serial.c
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- Lines: 3040
- Date:
Tue Feb 13 14:13:43 2001
- Orig file:
v2.4.1/linux/arch/cris/drivers/serial.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.1/linux/arch/cris/drivers/serial.c linux/arch/cris/drivers/serial.c
@@ -0,0 +1,3039 @@
+/* $Id: serial.c,v 1.6 2000/11/22 16:36:09 bjornw Exp $
+ *
+ * Serial port driver for the ETRAX 100LX chip
+ *
+ * Copyright (C) 1998, 1999, 2000 Axis Communications AB
+ *
+ * Many, many authors. Based once upon a time on serial.c for 16x50.
+ *
+ * $Log: serial.c,v $
+ * Revision 1.6 2000/11/22 16:36:09 bjornw
+ * Please marketing by using the correct case when spelling Etrax.
+ *
+ * Revision 1.5 2000/11/21 16:43:37 bjornw
+ * Fixed so it compiles under CONFIG_SVINTO_SIM
+ *
+ * Revision 1.4 2000/11/15 17:34:12 bjornw
+ * Added a timeout timer for flushing input channels. The interrupt-based
+ * fast flush system should be easy to merge with this later (works the same
+ * way, only with an irq instead of a system timer_list)
+ *
+ * Revision 1.3 2000/11/13 17:19:57 bjornw
+ * * Incredibly, this almost complete rewrite of serial.c worked (at least
+ * for output) the first time.
+ *
+ * Items worth noticing:
+ *
+ * No Etrax100 port 1 workarounds (does only compile on 2.4 anyway now)
+ * RS485 is not ported (why cant it be done in userspace as on x86 ?)
+ * Statistics done through async_icount - if any more stats are needed,
+ * that's the place to put them or in an arch-dep version of it.
+ * timeout_interrupt and the other fast timeout stuff not ported yet
+ * There be dragons in this 3k+ line driver
+ *
+ * Revision 1.2 2000/11/10 16:50:28 bjornw
+ * First shot at a 2.4 port, does not compile totally yet
+ *
+ * Revision 1.1 2000/11/10 16:47:32 bjornw
+ * Added verbatim copy of rev 1.49 etrax100ser.c from elinux
+ *
+ * Revision 1.49 2000/10/30 15:47:14 tobiasa
+ * Changed version number.
+ *
+ * Revision 1.48 2000/10/25 11:02:43 johana
+ * Changed %ul to %lu in printf's
+ *
+ * Revision 1.47 2000/10/18 15:06:53 pkj
+ * Compile correctly with CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST and
+ * CONFIG_SERIAL_PROC_ENTRY together.
+ * Some clean-up of the /proc/serial file.
+ *
+ * Revision 1.46 2000/10/16 12:59:40 johana
+ * Added CONFIG_SERIAL_PROC_ENTRY for statistics and debug info.
+ *
+ * Revision 1.45 2000/10/13 17:10:59 pkj
+ * Do not flush DMAs while flipping TTY buffers.
+ *
+ * Revision 1.44 2000/10/13 16:34:29 pkj
+ * Added a delay in ser_interrupt() for 2.3ms when an error is detected.
+ * We do not know why this delay is required yet, but without it the
+ * irmaflash program does not work (this was the program that needed
+ * the ser_interrupt() to be needed in the first place). This should not
+ * affect normal use of the serial ports.
+ *
+ * Revision 1.43 2000/10/13 16:30:44 pkj
+ * New version of the fast flush of serial buffers code. This time
+ * it is localized to the serial driver and uses a fast timer to
+ * do the work.
+ *
+ * Revision 1.42 2000/10/13 14:54:26 bennyo
+ * Fix for switching RTS when using rs485
+ *
+ * Revision 1.41 2000/10/12 11:43:44 pkj
+ * Cleaned up a number of comments.
+ *
+ * Revision 1.40 2000/10/10 11:58:39 johana
+ * Made RS485 support generic for all ports.
+ * Toggle rts in interrupt if no delay wanted.
+ * WARNING: No true transmitter empty check??
+ * Set d_wait bit when sending data so interrupt is delayed until
+ * fifo flushed. (Fix tcdrain() problem)
+ *
+ * Revision 1.39 2000/10/04 16:08:02 bjornw
+ * * Use virt_to_phys etc. for DMA addresses
+ * * Removed CONFIG_FLUSH_DMA_FAST hacks
+ * * Indentation fix
+ *
+ * Revision 1.38 2000/10/02 12:27:10 mattias
+ * * added variable used when using fast flush on serial dma.
+ * (CONFIG_FLUSH_DMA_FAST)
+ *
+ * Revision 1.37 2000/09/27 09:44:24 pkj
+ * Uncomment definition of SERIAL_HANDLE_EARLY_ERRORS.
+ *
+ * Revision 1.36 2000/09/20 13:12:52 johana
+ * Support for CONFIG_ETRAX100_SERIAL_RX_TIMEOUT_TICKS:
+ * Number of timer ticks between flush of receive fifo (1 tick = 10ms).
+ * Try 0-3 for low latency applications. Approx 5 for high load
+ * applications (e.g. PPP). Maybe this should be more adaptive some day...
+ *
+ * Revision 1.35 2000/09/20 10:36:08 johana
+ * Typo in get_lsr_info()
+ *
+ * Revision 1.34 2000/09/20 10:29:59 johana
+ * Let rs_chars_in_buffer() check fifo content as well.
+ * get_lsr_info() might work now (not tested).
+ * Easier to change the port to debug.
+ *
+ * Revision 1.33 2000/09/13 07:52:11 torbjore
+ * Support RS485
+ *
+ * Revision 1.32 2000/08/31 14:45:37 bjornw
+ * After sending a break we need to reset the transmit DMA channel
+ *
+ * Revision 1.31 2000/06/21 12:13:29 johana
+ * Fixed wait for all chars sent when closing port.
+ * (Used to always take 1 second!)
+ * Added shadows for directions of status/ctrl signals.
+ *
+ * Revision 1.30 2000/05/29 16:27:55 bjornw
+ * Simulator ifdef moved a bit
+ *
+ * Revision 1.29 2000/05/09 09:40:30 mattias
+ * * Added description of dma registers used in timeout_interrupt
+ * * Removed old code
+ *
+ * Revision 1.28 2000/05/08 16:38:58 mattias
+ * * Bugfix for flushing fifo in timeout_interrupt
+ * Problem occurs when bluetooth stack waits for a small number of bytes
+ * containing an event acknowledging free buffers in bluetooth HW
+ * As before, data was stuck in fifo until more data came on uart and
+ * flushed it up to the stack.
+ *
+ * Revision 1.27 2000/05/02 09:52:28 jonasd
+ * Added fix for peculiar etrax behaviour when eop is forced on an empty
+ * fifo. This is used when flashing the IRMA chip. Disabled by default.
+ *
+ * Revision 1.26 2000/03/29 15:32:02 bjornw
+ * 2.0.34 updates
+ *
+ * Revision 1.25 2000/02/16 16:59:36 bjornw
+ * * Receive DMA directly into the flip-buffer, eliminating an intermediary
+ * receive buffer and a memcpy. Will avoid some overruns.
+ * * Error message on debug port if an overrun or flip buffer overrun occurs.
+ * * Just use the first byte in the flag flip buffer for errors.
+ * * Check for timeout on the serial ports only each 5/100 s, not 1/100.
+ *
+ * Revision 1.24 2000/02/09 18:02:28 bjornw
+ * * Clear serial errors (overrun, framing, parity) correctly. Before, the
+ * receiver would get stuck if an error occured and we did not restart
+ * the input DMA.
+ * * Cosmetics (indentation, some code made into inlines)
+ * * Some more debug options
+ * * Actually shut down the serial port (DMA irq, DMA reset, receiver stop)
+ * when the last open is closed. Corresponding fixes in startup().
+ * * rs_close() "tx FIFO wait" code moved into right place, bug & -> && fixed
+ * and make a special case out of port 1 (R_DMA_CHx_STATUS is broken for that)
+ * * e100_disable_rx/enable_rx just disables/enables the receiver, not RTS
+ *
+ * Revision 1.23 2000/01/24 17:46:19 johana
+ * Wait for flush of DMA/FIFO when closing port.
+ *
+ * Revision 1.22 2000/01/20 18:10:23 johana
+ * Added TIOCMGET ioctl to return modem status.
+ * Implemented modem status/control that works with the extra signals
+ * (DTR, DSR, RI,CD) as well.
+ * 3 different modes supported:
+ * ser0 on PB (Bundy), ser1 on PB (Lisa) and ser2 on PA (Bundy)
+ * Fixed DEF_TX value that caused the serial transmitter pin (txd) to go to 0 when
+ * closing the last filehandle, NASTY!.
+ * Added break generation, not tested though!
+ * Use SA_SHIRQ when request_irq() for ser2 and ser3 (shared with) par0 and par1.
+ * You can't use them at the same time (yet..), but you can hopefully switch
+ * between ser2/par0, ser3/par1 with the same kernel config.
+ * Replaced some magic constants with defines
+ *
+ *
+ */
+
+static char *serial_version = "$Revision: 1.6 $";
+
+#include <linux/config.h>
+#include <linux/version.h>
+
+#include <linux/types.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/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#if (LINUX_VERSION_CODE >= 131343)
+#include <linux/init.h>
+#endif
+#if (LINUX_VERSION_CODE >= 131336)
+#include <asm/uaccess.h>
+#endif
+#include <linux/kernel.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/bitops.h>
+#include <asm/delay.h>
+
+#include <asm/svinto.h>
+
+/* non-arch dependant serial structures are in linux/serial.h */
+#include <linux/serial.h>
+/* while we keep our own stuff (struct e100_serial) in a local .h file */
+#include "serial.h"
+
+/*
+ * All of the compatibilty code so we can compile serial.c against
+ * older kernels is hidden in serial_compat.h
+ */
+#if defined(LOCAL_HEADERS) || (LINUX_VERSION_CODE < 0x020317) /* 2.3.23 */
+#include "serial_compat.h"
+#endif
+
+static DECLARE_TASK_QUEUE(tq_serial);
+
+struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+/* serial subtype definitions */
+#ifndef SERIAL_TYPE_NORMAL
+#define SERIAL_TYPE_NORMAL 1
+#define SERIAL_TYPE_CALLOUT 2
+#endif
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+//#define SERIAL_DEBUG_INTR
+//#define SERIAL_DEBUG_OPEN
+//#define SERIAL_DEBUG_FLOW
+//#define SERIAL_DEBUG_DATA
+//#define SERIAL_DEBUG_THROTTLE
+//#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */
+#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */
+
+/* Enable this to use serial interrupts to handle when you
+ expect the first received event on the serial port to
+ be an error, break or similar. Used to be able to flash IRMA
+ from eLinux */
+//#define SERIAL_HANDLE_EARLY_ERRORS
+
+
+#ifndef CONFIG_ETRAX100_SERIAL_RX_TIMEOUT_TICKS
+/* Default number of timer ticks before flushing rx fifo
+ * When using "little data, low latency applications: use 0
+ * When using "much data applications (PPP)" use ~5
+ */
+#define CONFIG_ETRAX100_SERIAL_RX_TIMEOUT_TICKS 5
+#endif
+
+#define MAX_FLUSH_TIME 8
+
+#define _INLINE_ inline
+
+static void change_speed(struct e100_serial *info);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+static int rs_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count);
+
+#define DEF_BAUD 0x99 /* 115.2 kbit/s */
+#define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST )
+#define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */
+/* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */
+#define DEF_TX 0x80 /* or SERIAL_CTRL_B */
+
+/* offsets from R_SERIALx_CTRL */
+
+#define REG_DATA 0
+#define REG_TR_DATA 0
+#define REG_STATUS 1
+#define REG_TR_CTRL 1
+#define REG_REC_CTRL 2
+#define REG_BAUD 3
+#define REG_XOFF 4 /* this is a 32 bit register */
+
+/* this is the data for the four serial ports in the etrax100 */
+/* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */
+/* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */
+
+static struct e100_serial rs_table[] = {
+ { DEF_BAUD, (unsigned char *)R_SERIAL0_CTRL, 1U << 12, /* uses DMA 6 and 7 */
+ R_DMA_CH6_CLR_INTR, R_DMA_CH6_FIRST, R_DMA_CH6_CMD,
+ R_DMA_CH6_STATUS, R_DMA_CH6_HWSW,
+ R_DMA_CH7_CLR_INTR, R_DMA_CH7_FIRST, R_DMA_CH7_CMD,
+ R_DMA_CH7_STATUS, R_DMA_CH7_HWSW,
+ STD_FLAGS, DEF_RX, DEF_TX, 2 }, /* ttyS0 */
+#ifndef CONFIG_SVINTO_SIM
+ { DEF_BAUD, (unsigned char *)R_SERIAL1_CTRL, 1U << 16, /* uses DMA 8 and 9 */
+ R_DMA_CH8_CLR_INTR, R_DMA_CH8_FIRST, R_DMA_CH8_CMD,
+ R_DMA_CH8_STATUS, R_DMA_CH8_HWSW,
+ R_DMA_CH9_CLR_INTR, R_DMA_CH9_FIRST, R_DMA_CH9_CMD,
+ R_DMA_CH9_STATUS, R_DMA_CH9_HWSW,
+ STD_FLAGS, DEF_RX, DEF_TX, 3 }, /* ttyS1 */
+
+ { DEF_BAUD, (unsigned char *)R_SERIAL2_CTRL, 1U << 4, /* uses DMA 2 and 3 */
+ R_DMA_CH2_CLR_INTR, R_DMA_CH2_FIRST, R_DMA_CH2_CMD,
+ R_DMA_CH2_STATUS, R_DMA_CH2_HWSW,
+ R_DMA_CH3_CLR_INTR, R_DMA_CH3_FIRST, R_DMA_CH3_CMD,
+ R_DMA_CH3_STATUS, R_DMA_CH3_HWSW,
+ STD_FLAGS, DEF_RX, DEF_TX, 0 }, /* ttyS2 */
+
+ { DEF_BAUD, (unsigned char *)R_SERIAL3_CTRL, 1U << 8, /* uses DMA 4 and 5 */
+ R_DMA_CH4_CLR_INTR, R_DMA_CH4_FIRST, R_DMA_CH4_CMD,
+ R_DMA_CH4_STATUS, R_DMA_CH4_HWSW,
+ R_DMA_CH5_CLR_INTR, R_DMA_CH5_FIRST, R_DMA_CH5_CMD,
+ R_DMA_CH5_STATUS, R_DMA_CH5_HWSW,
+ STD_FLAGS, DEF_RX, DEF_TX, 1 } /* ttyS3 */
+#endif
+};
+
+
+#define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))
+
+static struct tty_struct *serial_table[NR_PORTS];
+static struct termios *serial_termios[NR_PORTS];
+static struct termios *serial_termios_locked[NR_PORTS];
+
+
+/* RS-485 */
+#if defined(CONFIG_RS485)
+#if defined(CONFIG_RS485_ON_PA)
+static int rs485_pa_bit = CONFIG_RS485_ON_PA_BIT;
+#endif
+#endif
+
+
+/* For now we assume that all bits are on the same port for each serial port */
+
+/* Dummy shadow variables */
+static unsigned char dummy_ser0 = 0x00;
+static unsigned char dummy_ser1 = 0x00;
+static unsigned char dummy_ser2 = 0x00;
+static unsigned char dummy_ser3 = 0x00;
+
+static unsigned char dummy_dir_ser0 = 0x00;
+static unsigned char dummy_dir_ser1 = 0x00;
+static unsigned char dummy_dir_ser2 = 0x00;
+static unsigned char dummy_dir_ser3 = 0x00;
+
+/* Info needed for each ports extra control/status signals.
+ We only supports that all pins uses same register for each port */
+struct control_pins
+{
+ volatile unsigned char *port;
+ volatile unsigned char *shadow;
+ volatile unsigned char *dir_shadow;
+
+ unsigned char dtr_bit;
+ unsigned char ri_bit;
+ unsigned char dsr_bit;
+ unsigned char cd_bit;
+};
+
+static const struct control_pins e100_modem_pins[NR_PORTS] =
+{
+/* Ser 0 */
+ {
+#if defined(CONFIG_ETRAX100_SER0_DTR_RI_DSR_CD_ON_PB)
+ R_PORT_PB_DATA, &port_pb_data_shadow, &port_pb_dir_shadow,
+ CONFIG_ETRAX100_SER0_DTR_ON_PB_BIT,
+ CONFIG_ETRAX100_SER0_RI_ON_PB_BIT,
+ CONFIG_ETRAX100_SER0_DSR_ON_PB_BIT,
+ CONFIG_ETRAX100_SER0_CD_ON_PB_BIT
+#else
+ &dummy_ser0, &dummy_ser0, &dummy_dir_ser0, 0, 1, 2, 3
+#endif
+ },
+/* Ser 1 */
+ {
+#if defined(CONFIG_ETRAX100_SER1_DTR_RI_DSR_CD_ON_PB)
+ R_PORT_PB_DATA, &port_pb_data_shadow, &port_pb_dir_shadow,
+ CONFIG_ETRAX100_SER1_DTR_ON_PB_BIT,
+ CONFIG_ETRAX100_SER1_RI_ON_PB_BIT,
+ CONFIG_ETRAX100_SER1_DSR_ON_PB_BIT,
+ CONFIG_ETRAX100_SER1_CD_ON_PB_BIT
+#else
+ &dummy_ser1, &dummy_ser1, &dummy_dir_ser1, 0, 1, 2, 3
+#endif
+ },
+/* Ser 2 */
+ {
+#if defined(CONFIG_ETRAX100_SER2_DTR_RI_DSR_CD_ON_PA)
+ R_PORT_PA_DATA, &port_pa_data_shadow, &port_pa_dir_shadow,
+ CONFIG_ETRAX100_SER2_DTR_ON_PA_BIT,
+ CONFIG_ETRAX100_SER2_RI_ON_PA_BIT,
+ CONFIG_ETRAX100_SER2_DSR_ON_PA_BIT,
+ CONFIG_ETRAX100_SER2_CD_ON_PA_BIT
+#else
+ &dummy_ser2, &dummy_ser2, &dummy_dir_ser2, 0, 1, 2, 3
+#endif
+ },
+/* Ser 3 */
+ {
+ &dummy_ser3, &dummy_ser3, &dummy_dir_ser3, 0, 1, 2, 3
+ }
+};
+
+#if defined(CONFIG_RS485) && defined(CONFIG_RS485_ON_PA)
+unsigned char rs485_pa_port = CONFIG_RS485_ON_PA_BIT;
+#endif
+
+#define E100_RTS_MASK 0x20
+#define E100_CTS_MASK 0x40
+
+
+/* All serial port signals are active low:
+ * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
+ * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level
+ *
+ * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
+ */
+
+/* Output */
+#define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
+/* Input */
+#define E100_CTS_GET(info) ((info)->port[REG_STATUS] & E100_CTS_MASK)
+
+/* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
+/* Is an output */
+#define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].shadow) & (1 << e100_modem_pins[(info)->line].dtr_bit))
+
+/* Normally inputs */
+#define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].port) & (1 << e100_modem_pins[(info)->line].ri_bit))
+#define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].port) & (1 << e100_modem_pins[(info)->line].cd_bit))
+
+/* Input */
+#define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].port) & (1 << e100_modem_pins[(info)->line].dsr_bit))
+
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write. We need to
+ * lock it in case the memcpy_fromfs 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.
+ */
+static unsigned char *tmp_buf;
+#ifdef DECLARE_MUTEX
+static DECLARE_MUTEX(tmp_buf_sem);
+#else
+static struct semaphore tmp_buf_sem = MUTEX;
+#endif
+
+#ifdef CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST
+#define TIMER1_IRQ_NBR 3
+
+/* clock select 10 for timer 1 gives 230400 Hz */
+#define FASTTIMER_SELECT (10)
+/* we use a source of 230400 Hz and a divider of 15 => 15360 Hz */
+#define FASTTIMER_DIV (15)
+
+/* fast flush timer stuff */
+static int fast_timer_started = 0;
+static unsigned long int fast_timer_ints = 0;
+
+static void _INLINE_ start_flush_timer(void)
+{
+ if (fast_timer_started)
+ return;
+
+ *R_TIMER_CTRL = r_timer_ctrl_shadow =
+ (r_timer_ctrl_shadow &
+ ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
+ ~IO_MASK(R_TIMER_CTRL, tm1) &
+ ~IO_MASK(R_TIMER_CTRL, clksel1)) |
+ IO_FIELD(R_TIMER_CTRL, timerdiv1, FASTTIMER_DIV) |
+ IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
+ IO_FIELD(R_TIMER_CTRL, clksel1, FASTTIMER_SELECT);
+
+ *R_TIMER_CTRL = r_timer_ctrl_shadow =
+ (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
+ IO_STATE(R_TIMER_CTRL, tm1, run);
+
+ /* enable timer1 irq */
+
+ *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
+ fast_timer_started = 1;
+}
+#endif /* CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST */
+
+/*
+ * This function maps from the Bxxxx defines in asm/termbits.h into real
+ * baud rates.
+ */
+
+static int
+cflag_to_baud(unsigned int cflag)
+{
+ static int baud_table[] = {
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
+ 4800, 9600, 19200, 38400 };
+
+ static int ext_baud_table[] = {
+ 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000 };
+
+ if(cflag & CBAUDEX)
+ return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
+ else
+ return baud_table[cflag & CBAUD];
+}
+
+/* and this maps to an etrax100 hardware baud constant */
+
+static unsigned char
+cflag_to_etrax_baud(unsigned int cflag)
+{
+ char retval;
+
+ static char baud_table[] = {
+ -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };
+
+ static char ext_baud_table[] = {
+ -1, 8, 9, 10, 11, 12, 13, 14 };
+
+ if(cflag & CBAUDEX)
+ retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
+ else
+ retval = baud_table[cflag & CBAUD];
+
+ if(retval < 0) {
+ printk("serdriver tried setting invalid baud rate, flags %x.\n", cflag);
+ retval = 5; /* choose default 9600 instead */
+ }
+
+ return retval | (retval << 4); /* choose same for both TX and RX */
+}
+
+
+/* Various static support functions */
+
+/* Functions to set or clear DTR/RTS on the requested line */
+/* It is complicated by the fact that RTS is a serial port register, while
+ * DTR might not be implemented in the HW at all, and if it is, it can be on
+ * any general port.
+ */
+
+static inline void
+e100_dtr(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+ unsigned char mask = ( 1 << e100_modem_pins[info->line].dtr_bit);
+#ifdef SERIAL_DEBUG_IO
+ printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
+ printk("ser%i shadow before 0x%02X get: %i\n",
+ info->line, *e100_modem_pins[info->line].shadow,
+ E100_DTR_GET(info));
+#endif
+ /* DTR is active low */
+ {
+ unsigned long flags;
+ save_flags(flags);
+ cli();
+ *e100_modem_pins[info->line].shadow &= ~mask;
+ *e100_modem_pins[info->line].shadow |= (set ? 0 : mask);
+ *e100_modem_pins[info->line].port = *e100_modem_pins[info->line].shadow;
+ restore_flags(flags);
+ }
+
+#if 0
+ REG_SHADOW_SET(e100_modem_pins[info->line].port,
+ *e100_modem_pins[info->line].shadow,
+ e100_modem_pins[info->line].dtr_bit, !set);
+#endif
+#ifdef SERIAL_DEBUG_IO
+ printk("ser%i shadow after 0x%02X get: %i\n",
+ info->line, *e100_modem_pins[info->line].shadow,
+ E100_DTR_GET(info));
+#endif
+#endif
+}
+
+/* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
+ * 0=0V , 1=3.3V
+ */
+static inline void
+e100_rts(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+#ifdef SERIAL_DEBUG_IO
+ printk("ser%i rts %i\n", info->line, set);
+#endif
+ info->rx_ctrl &= ~E100_RTS_MASK;
+ info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */
+ info->port[REG_REC_CTRL] = info->rx_ctrl;
+#endif
+}
+
+/* If this behaves as a modem, RI and CD is an output */
+static inline void
+e100_ri_out(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+ /* RI is active low */
+ {
+ unsigned char mask = ( 1 << e100_modem_pins[info->line].ri_bit);
+ unsigned long flags;
+ save_flags(flags);
+ cli();
+ *e100_modem_pins[info->line].shadow &= ~mask;
+ *e100_modem_pins[info->line].shadow |= (set ? 0 : mask);
+ *e100_modem_pins[info->line].port = *e100_modem_pins[info->line].shadow;
+ restore_flags(flags);
+ }
+#if 0
+ REG_SHADOW_SET(e100_modem_pins[info->line].port,
+ *e100_modem_pins[info->line].shadow,
+ e100_modem_pins[info->line].ri_bit, !set);
+#endif
+#endif
+}
+static inline void
+e100_cd_out(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+ /* CD is active low */
+ {
+ unsigned char mask = ( 1 << e100_modem_pins[info->line].cd_bit);
+ unsigned long flags;
+ save_flags(flags);
+ cli();
+ *e100_modem_pins[info->line].shadow &= ~mask;
+ *e100_modem_pins[info->line].shadow |= (set ? 0 : mask);
+ *e100_modem_pins[info->line].port = *e100_modem_pins[info->line].shadow;
+ restore_flags(flags);
+ }
+#if 0
+ REG_SHADOW_SET(e100_modem_pins[info->line].port,
+ *e100_modem_pins[info->line].shadow,
+ e100_modem_pins[info->line].cd_bit, !set);
+#endif
+#endif
+}
+
+static inline void
+e100_disable_rx(struct e100_serial *info)
+{
+#ifndef CONFIG_SVINTO_SIM
+ /* disable the receiver */
+ info->port[REG_REC_CTRL] = (info->rx_ctrl &= ~0x40);
+#endif
+}
+
+static inline void
+e100_enable_rx(struct e100_serial *info)
+{
+#ifndef CONFIG_SVINTO_SIM
+ /* enable the receiver */
+ info->port[REG_REC_CTRL] = (info->rx_ctrl |= 0x40);
+#endif
+}
+
+/* the rx DMA uses both the dma_descr and the dma_eop interrupts */
+
+static inline void
+e100_disable_rxdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("rxdma_irq(%d): 0\n",info->line);
+#endif
+ *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
+}
+
+static inline void
+e100_enable_rxdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("rxdma_irq(%d): 1\n",info->line);
+#endif
+ *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
+}
+
+/* the tx DMA uses only dma_descr interrupt */
+
+static inline void
+e100_disable_txdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("txdma_irq(%d): 0\n",info->line);
+#endif
+ *R_IRQ_MASK2_CLR = info->irq;
+}
+
+static inline void
+e100_enable_txdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("txdma_irq(%d): 1\n",info->line);
+#endif
+ *R_IRQ_MASK2_SET = info->irq;
+}
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+/* in order to detect and fix errors on the first byte
+ we have to use the serial interrupts as well. */
+
+static inline void
+e100_disable_serial_data_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("ser_irq(%d): 0\n",info->line);
+#endif
+ *R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
+}
+
+static inline void
+e100_enable_serial_data_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+ printk("ser_irq(%d): 1\n",info->line);
+ printk("**** %d = %d\n",
+ (8+2*info->line),
+ (1U << (8+2*info->line)));
+#endif
+ *R_IRQ_MASK1_SET = (1U << (8+2*info->line));
+}
+#endif
+
+#if defined(CONFIG_RS485)
+/* Enable RS-485 mode on selected port. This is UGLY. */
+static int
+e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
+{
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+
+#if defined(CONFIG_RS485_ON_PA)
+ *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
+#endif
+
+ info->rs485.rts_on_send = 0x01 & r->rts_on_send;
+ info->rs485.rts_after_sent = 0x01 & r->rts_after_sent;
+ info->rs485.delay_rts_before_send = r->delay_rts_before_send;
+ info->rs485.enabled = r->enabled;
+
+ return 0;
+}
+
+/* Enable RS-485 mode on selected port. This is UGLY. */
+static int
+e100_write_rs485(struct tty_struct *tty,struct rs485_write *r)
+{
+ int stop_delay;
+ int total, i;
+ int max_j, delay_ms, bits;
+ tcflag_t cflags;
+ int size = (*r).outc_size;
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+ struct wait_queue wait = { current, NULL };
+
+ /* If we are in RS-485 mode, we need to toggle RTS and disable
+ * the receiver before initiating a DMA transfer
+ */
+ e100_rts(info, info->rs485.rts_on_send);
+#if defined(CONFIG_RS485_DISABLE_RECEIVER)
+ e100_disable_rx(info);
+ e100_disable_rxdma_irq(info);
+#endif
+
+ if (info->rs485.delay_rts_before_send > 0){
+ current->timeout = jiffies + (info->rs485.delay_rts_before_send * HZ)/1000;
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ current->timeout = 0;
+ }
+ total = rs_write(tty, 1, (*r).outc, (*r).outc_size);
+
+ /* If we are in RS-485 mode the following things has to be done:
+ * wait until DMA is ready
+ * wait on transmit shift register
+ * wait to toggle RTS
+ * enable the receiver
+ */
+
+ /* wait on transmit shift register */
+ /* All is sent, check if we should wait more before toggling rts */
+
+ /* calc. number of bits / data byte */
+ cflags = info->tty->termios->c_cflag;
+ /* databits + startbit and 1 stopbit */
+ if((cflags & CSIZE) == CS7)
+ bits = 9;
+ else
+ bits = 10;
+
+ if(cflags & CSTOPB) /* 2 stopbits ? */
+ bits++;
+
+ if(cflags & PARENB) /* parity bit ? */
+ bits++;
+
+ /* calc timeout */
+ delay_ms = ((bits * size * 1000) / info->baud) + 1;
+ max_j = jiffies + (delay_ms * HZ)/1000 + 10;
+
+ while (jiffies < max_j ) {
+ if (info->port[REG_STATUS] & 0x20) {
+ for( i=0 ; i<100; i++ ) {};
+ if (info->port[REG_STATUS] & 0x20) {
+ /* ~25 for loops per usec */
+ stop_delay = 25 * (1000000 / info->baud);
+ if(cflags & CSTOPB)
+ stop_delay *= 2;
+ for( i=0 ; i<stop_delay; i++ ) {};
+ break;
+ }
+ }
+ }
+
+ e100_rts(info, info->rs485.rts_after_sent);
+
+#if defined(CONFIG_RS485_DISABLE_RECEIVER)
+ e100_enable_rx(info);
+ e100_enable_rxdma_irq(info);
+#endif
+
+ return total;
+}
+#endif
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+
+/* FIXME - when are these used and what is the purpose ?
+ * In rs_stop we probably just can block the transmit DMA ready irq
+ * and in rs_start we re-enable it (and then the old one will come).
+ */
+
+static void
+rs_stop(struct tty_struct *tty)
+{
+}
+
+static void
+rs_start(struct tty_struct *tty)
+{
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static _INLINE_ void
+rs_sched_event(struct e100_serial *info,
+ int event)
+{
+ info->event |= 1 << event;
+ queue_task(&info->tqueue, &tq_serial);
+ mark_bh(SERIAL_BH);
+}
+
+/* The output DMA channel is free - use it to send as many chars as possible
+ * NOTES:
+ * We don't pay attention to info->x_char, which means if the TTY wants to
+ * use XON/XOFF it will set info->x_char but we won't send any X char!
+ *
+ * To implement this, we'd just start a DMA send of 1 byte pointing at a
+ * buffer containing the X char, and skip updating xmit. We'd also have to
+ * check if the last sent char was the X char when we enter this function
+ * the next time, to avoid updating xmit with the sent X value.
+ */
+
+static void
+transmit_chars(struct e100_serial *info)
+{
+ unsigned int c, sentl;
+ struct etrax_dma_descr *descr;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* This will output too little if tail is not 0 always since
+ * we don't reloop to send the other part. Anyway this SHOULD be a
+ * no-op - transmit_chars would never really be called during sim
+ * since rs_write does not write into the xmit buffer then.
+ */
+ if(info->xmit.tail)
+ printk("Error in serial.c:transmit_chars(), tail!=0\n");
+ if(info->xmit.head != info->xmit.tail) {
+ SIMCOUT(info->xmit.buf + info->xmit.tail,
+ CIRC_CNT(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE));
+ info->xmit.head = info->xmit.tail; /* move back head */
+ info->tr_running = 0;
+ }
+ return;
+#endif
+ /* acknowledge both a dma_descr and dma_eop irq in R_DMAx_CLRINTR */
+ *info->oclrintradr = 3;
+
+#ifdef SERIAL_DEBUG_INTR
+ if(info->line == SERIAL_DEBUG_LINE)
+ printk("tc\n");
+#endif
+ if(!info->tr_running) {
+ /* weirdo... we shouldn't get here! */
+ printk("Achtung: transmit_chars with !tr_running\n");
+ return;
+ }
+
+ descr = &info->tr_descr;
+
+ /* first get the amount of bytes sent during the last DMA transfer,
+ and update xmit accordingly */
+
+ /* if the stop bit was not set, all data has been sent */
+ if(!(descr->status & d_stop)) {
+ sentl = descr->sw_len;
+ } else
+ /* otherwise we find the amount of data sent here */
+ sentl = descr->hw_len;
+
+ /* update stats */
+ info->icount.tx += sentl;
+
+ /* update xmit buffer */
+ info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);
+
+ /* if there is only a few chars left in the buf, wake up the blocked
+ write if any */
+ if (CIRC_CNT(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+ /* find out the largest amount of consecutive bytes we want to send now */
+
+ c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+
+ if(c <= 0) {
+ /* our job here is done, don't schedule any new DMA transfer */
+ info->tr_running = 0;
+
+#if defined(CONFIG_RS485)
+ /* Check if we should toggle RTS now */
+ if (info->rs485.enabled)
+ {
+ /* Make sure fifo is empty */
+ int in_fifo = 0 ;
+ do{
+ in_fifo = (*info->ostatusadr) & 0x007F ;
+ } while (in_fifo > 0) ;
+ /* Any way to really check transmitter empty? (TEMT) */
+ /* Control RTS to set to RX mode */
+ e100_rts(info, info->rs485.rts_after_sent);
+#if defined(CONFIG_RS485_DISABLE_RECEIVER)
+ e100_enable_rx(info);
+ e100_enable_rxdma_irq(info);
+#endif
+ }
+#endif /* RS485 */
+
+ return;
+ }
+
+ /* ok we can schedule a dma send of c chars starting at info->xmit.tail */
+ /* set up the descriptor correctly for output */
+
+ descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
+ descr->sw_len = c;
+ descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
+ descr->status = 0;
+
+ *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
+ *info->ocmdadr = 1; /* dma command start -> R_DMAx_CMD */
+
+ /* DMA is now running (hopefully) */
+
+}
+
+static void
+start_transmit(struct e100_serial *info)
+{
+#if 0
+ if(info->line == SERIAL_DEBUG_LINE)
+ printk("x\n");
+#endif
+
+ info->tr_descr.sw_len = 0;
+ info->tr_descr.hw_len = 0;
+ info->tr_descr.status = 0;
+ info->tr_running = 1;
+
+ transmit_chars(info);
+}
+
+
+static _INLINE_ void
+receive_chars(struct e100_serial *info)
+{
+ struct tty_struct *tty;
+ unsigned char rstat;
+ unsigned int recvl;
+ struct etrax_dma_descr *descr;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* No receive in the simulator. Will probably be when the rest of
+ * the serial interface works, and this piece will just be removed.
+ */
+ return;
+#endif
+
+ tty = info->tty;
+
+ /* acknowledge both a dma_descr and dma_eop irq in R_DMAx_CLRINTR */
+
+ *info->iclrintradr = 3;
+
+ if(!tty) /* something wrong... */
+ return;
+
+ descr = &info->rec_descr;
+
+ /* find out how many bytes were read */
+
+ /* if the eop bit was not set, all data has been received */
+ if(!(descr->status & d_eop)) {
+ recvl = descr->sw_len;
+ } else {
+ /* otherwise we find the amount of data received here */
+ recvl = descr->hw_len;
+ }
+ if(recvl) {
+ unsigned char *buf;
+ struct async_icount *icount;
+
+ icount = &info->icount;
+
+ /* update stats */
+ icount->rx += recvl;
+
+ /* read the status register so we can detect errors */
+ rstat = info->port[REG_STATUS];
+
+ if(rstat & 0xe) {
+ /* if we got an error, we must reset it by reading the
+ * data_in field
+ */
+ (void)info->port[REG_DATA];
+ }
+
+ /* we only ever write errors into the first byte in the flip
+ * flag buffer, so we dont have to clear it all every time
+ */
+
+ if(rstat & 0x04) {
+ icount->parity++;
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ } else if(rstat & 0x08) {
+ icount->overrun++;
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ } else if(rstat & 0x02) {
+ icount->frame++;
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ } else
+ *tty->flip.flag_buf_ptr = 0;
+
+ /* use the flip buffer next in turn to restart DMA into */
+
+ if (tty->flip.buf_num) {
+ buf = tty->flip.char_buf;
+ } else {
+ buf = tty->flip.char_buf + TTY_FLIPBUF_SIZE;
+ }
+
+ if(buf == phys_to_virt(descr->buf)) {
+ printk("ttyS%d flip-buffer overrun!\n", info->line);
+ icount->overrun++;
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ /* restart old buffer */
+ } else {
+ descr->buf = virt_to_phys(buf);
+
+ /* schedule or push a flip of the buffer */
+
+ info->tty->flip.count = recvl;
+
+#if (LINUX_VERSION_CODE > 131394) /* 2.1.66 */
+ /* this includes a check for low-latency */
+ tty_flip_buffer_push(tty);
+#else
+ queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
+#endif
+ }
+ }
+
+ /* restart the receiving dma */
+
+ descr->sw_len = TTY_FLIPBUF_SIZE;
+ descr->ctrl = d_int | d_eol | d_eop;
+ descr->hw_len = 0;
+ descr->status = 0;
+
+ *info->ifirstadr = virt_to_phys(descr);
+ *info->icmdadr = 1; /* start */
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+ e100_enable_serial_data_irq(info);
+#endif
+ /* input dma should be running now */
+}
+
+static void
+start_receive(struct e100_serial *info)
+{
+ struct etrax_dma_descr *descr;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* No receive in the simulator. Will probably be when the rest of
+ * the serial interface works, and this piece will just be removed.
+ */
+ return;
+#endif
+
+ /* reset the input dma channel to be sure it works */
+
+ *info->icmdadr = 4;
+ while((*info->icmdadr & 7) == 4);
+
+ descr = &info->rec_descr;
+
+ /* start the receiving dma into the flip buffer */
+
+ descr->ctrl = d_int | d_eol | d_eop;
+ descr->sw_len = TTY_FLIPBUF_SIZE;
+ descr->buf = virt_to_phys(info->tty->flip.char_buf_ptr);
+ descr->hw_len = 0;
+ descr->status = 0;
+
+ info->tty->flip.count = 0;
+
+ *info->ifirstadr = virt_to_phys(descr);
+ *info->icmdadr = 1; /* start */
+}
+
+
+static _INLINE_ void
+status_handle(struct e100_serial *info, unsigned short status)
+{
+}
+
+/* the bits in the MASK2 register are laid out like this:
+ DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
+ where I is the input channel and O is the output channel for the port.
+ info->irq is the bit number for the DMAO_DESCR so to check the others we
+ shift info->irq to the left.
+*/
+
+/* dma output channel interrupt handler
+ this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or
+ DMA8(ser1) when they have finished a descriptor with the intr flag set.
+*/
+
+static void
+tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct e100_serial *info;
+ unsigned long ireg;
+ int i;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* No receive in the simulator. Will probably be when the rest of
+ * the serial interface works, and this piece will just be removed.
+ */
+ {
+ const char *s = "What? tr_interrupt in simulator??\n";
+ SIMCOUT(s,strlen(s));
+ }
+ return;
+#endif
+
+ /* find out the line that caused this irq and get it from rs_table */
+
+ ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
+
+ for(i = 0; i < NR_PORTS; i++) {
+ info = rs_table + i;
+ /* check for dma_descr (dont need to check for dma_eop in output dma for serial */
+ if(ireg & info->irq) {
+ /* we can send a new dma bunch. make it so. */
+ transmit_chars(info);
+ }
+
+ /* FIXME: here we should really check for a change in the
+ status lines and if so call status_handle(info) */
+ }
+}
+
+/* dma input channel interrupt handler */
+
+static void
+rec_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct e100_serial *info;
+ unsigned long ireg;
+ int i;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* No receive in the simulator. Will probably be when the rest of
+ * the serial interface works, and this piece will just be removed.
+ */
+ {
+ const char *s = "What? rec_interrupt in simulator??\n";
+ SIMCOUT(s,strlen(s));
+ }
+ return;
+#endif
+
+ /* find out the line that caused this irq and get it from rs_table */
+
+ ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */
+
+ for(i = 0; i < NR_PORTS; i++) {
+ info = rs_table + i;
+ /* check for both dma_eop and dma_descr for the input dma channel */
+ if(ireg & ((info->irq << 2) | (info->irq << 3))) {
+ /* we have received something */
+ receive_chars(info);
+ }
+
+ /* FIXME: here we should really check for a change in the
+ status lines and if so call status_handle(info) */
+ }
+}
+
+/* dma fifo/buffer timeout handler
+ forces an end-of-packet for the dma input channel if no chars
+ have been received for CONFIG_ETRAX100_RX_TIMEOUT_TICKS/100 s.
+ If CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST is configured then this
+ handler is instead run at 15360 Hz.
+*/
+
+#ifndef CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST
+static int timeout_divider = 0;
+#endif
+
+static struct timer_list flush_timer;
+
+static void
+timed_flush_handler(void)
+{
+ struct e100_serial *info;
+ int i;
+ unsigned int magic;
+
+#ifdef CONFIG_SVINTO_SIM
+ return;
+#endif
+
+ for(i = 0; i < NR_PORTS; i++) {
+ info = rs_table + i;
+ if(!(info->flags & ASYNC_INITIALIZED))
+ continue;
+
+ /* istatusadr (bit 6-0) hold number of bytes in fifo
+ * ihwswadr (bit 31-16) holds number of bytes in dma buffer
+ * ihwswadr (bit 15-0) specifies size of dma buffer
+ */
+
+ magic = (*info->istatusadr & 0x3f);
+ magic += ((*info->ihwswadr&0xffff ) - (*info->ihwswadr >> 16));
+
+ /* if magic is equal to fifo_magic (magic in previous
+ * timeout_interrupt) then no new data has arrived since last
+ * interrupt and we'll force eop to flush fifo+dma buffers
+ */
+
+ if(magic != info->fifo_magic) {
+ info->fifo_magic = magic;
+ info->fifo_didmagic = 0;
+ } else {
+ /* hit the timeout, force an EOP for the input
+ * dma channel if we haven't already
+ */
+ if(!info->fifo_didmagic && magic) {
+ info->fifo_didmagic = 1;
+ info->fifo_magic = 0;
+ *R_SET_EOP = 1U << info->iseteop;
+ }
+ }
+ }
+
+ /* restart flush timer */
+
+ mod_timer(&flush_timer, jiffies + MAX_FLUSH_TIME);
+}
+
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+
+/* If there is an error (ie break) when the DMA is running and
+ * there are no bytes in the fifo the DMA is stopped and we get no
+ * eop interrupt. Thus we have to monitor the first bytes on a DMA
+ * transfer, and if it is without error we can turn the serial
+ * interrupts off.
+ */
+
+static void
+ser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct e100_serial *info;
+ int i;
+ unsigned char rstat;
+
+ for(i = 0; i < NR_PORTS; i++) {
+
+ info = rs_table + i;
+ rstat = info->port[REG_STATUS];
+
+ if(*R_IRQ_MASK1_RD & (1U << (8+2*info->line))) { /* This line caused the irq */
+#ifdef SERIAL_DEBUG_INTR
+ printk("Interrupt from serport %d\n", i);
+#endif
+ if(rstat & 0x0e) {
+ /* FIXME: This is weird, but if this delay is
+ * not present then irmaflash does not work...
+ */
+ udelay(2300);
+
+ /* if we got an error, we must reset it by
+ * reading the data_in field
+ */
+ (void)info->port[REG_DATA];
+
+ PROCSTAT(early_errors_cnt[info->line]++);
+
+ /* restart the DMA */
+ *info->icmdadr = 3;
+ }
+ else { /* it was a valid byte, now let the dma do the rest */
+#ifdef SERIAL_DEBUG_INTR
+ printk("** OK, disabling ser_interupts\n");
+#endif
+ e100_disable_serial_data_irq(info);
+ }
+ }
+ }
+}
+#endif
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void
+do_serial_bh(void)
+{
+ run_task_queue(&tq_serial);
+}
+
+static void
+do_softint(void *private_)
+{
+ struct e100_serial *info = (struct e100_serial *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+ wake_up_interruptible(&tty->write_wait);
+ }
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ *
+ */
+static void
+do_serial_hangup(void *private_)
+{
+ struct e100_serial *info = (struct e100_serial *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ tty_hangup(tty);
+}
+
+static int
+startup(struct e100_serial * info)
+{
+ unsigned long flags;
+ unsigned long page;
+
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ save_flags(flags); cli();
+
+ /* if it was already initialized, skip this */
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ free_page(page);
+ restore_flags(flags);
+ return -EBUSY;
+ }
+
+ if (info->xmit.buf)
+ free_page(page);
+ else
+ info->xmit.buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttyS%d (xmit_buf 0x%x)...\n", info->line, info->xmit_buf);
+#endif
+
+ if(info->tty) {
+
+ /* clear the tty flip flag buffer since we will not
+ * be using it (we only use the first byte..)
+ */
+
+ memset(info->tty->flip.flag_buf, 0, TTY_FLIPBUF_SIZE * 2);
+ }
+
+ save_flags(flags);
+ cli();
+
+#ifdef CONFIG_SVINTO_SIM
+ /* Bits and pieces collected from below. Better to have them
+ in one ifdef:ed clause than to mix in a lot of ifdefs,
+ right? */
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit.head = info->xmit.tail = 0;
+
+ /* No real action in the simulator, but may set info important
+ to ioctl. */
+ change_speed(info);
+#else
+
+ /*
+ * Clear the FIFO buffers and disable them
+ * (they will be reenabled in change_speed())
+ */
+
+ /*
+ * Reset the DMA channels and make sure their interrupts are cleared
+ */
+
+ *info->icmdadr = 4; /* reset command */
+ *info->ocmdadr = 4; /* reset command */
+
+ while((*info->icmdadr & 7) == 4); /* wait until reset cycle is complete */
+ while((*info->ocmdadr & 7) == 4);
+
+ *info->iclrintradr = 3; /* make sure the irqs are cleared */
+ *info->oclrintradr = 3;
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->xmit.head = info->xmit.tail = 0;
+
+ /*
+ * and set the speed and other flags of the serial port
+ * this will start the rx/tx as well
+ */
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+ e100_enable_serial_data_irq(info);
+#endif
+ change_speed(info);
+
+ /* dummy read to reset any serial errors */
+
+ (void)info->port[REG_DATA];
+
+ /* enable the interrupts */
+
+ e100_enable_txdma_irq(info);
+ e100_enable_rxdma_irq(info);
+
+ info->tr_running = 0; /* to be sure we dont lock up the transmitter */
+
+ /* setup the dma input descriptor and start dma */
+
+ start_receive(info);
+
+ /* for safety, make sure the descriptors last result is 0 bytes written */
+
+ info->tr_descr.sw_len = 0;
+ info->tr_descr.hw_len = 0;
+ info->tr_descr.status = 0;
+
+ /* enable RTS/DTR last */
+
+ e100_rts(info, 1);
+ e100_dtr(info, 1);
+
+#endif /* CONFIG_SVINTO_SIM */
+
+ info->flags |= ASYNC_INITIALIZED;
+
+ restore_flags(flags);
+ return 0;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void
+shutdown(struct e100_serial * info)
+{
+ unsigned long flags;
+
+#ifndef CONFIG_SVINTO_SIM
+ /* shut down the transmitter and receiver */
+
+ e100_disable_rx(info);
+ info->port[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
+
+ e100_disable_rxdma_irq(info);
+ e100_disable_txdma_irq(info);
+
+ info->tr_running = 0;
+
+ /* reset both dma channels */
+
+ *info->icmdadr = 4;
+ *info->ocmdadr = 4;
+
+#endif /* CONFIG_SVINTO_SIM */
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....\n", info->line,
+ info->irq);
+#endif
+
+ save_flags(flags);
+ cli(); /* Disable interrupts */
+
+ if (info->xmit.buf) {
+ unsigned long pg = (unsigned long) info->xmit.buf;
+ info->xmit.buf = 0;
+ free_page(pg);
+ }
+
+ if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
+ /* hang up DTR and RTS if HUPCL is enabled */
+ e100_dtr(info, 0);
+ e100_rts(info, 0); /* could check CRTSCTS before doing this */
+ }
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ASYNC_INITIALIZED;
+ restore_flags(flags);
+}
+
+
+/* change baud rate and other assorted parameters */
+
+static void
+change_speed(struct e100_serial *info)
+{
+ unsigned int cflag;
+
+ /* first some safety checks */
+
+ if(!info->tty || !info->tty->termios)
+ return;
+ if (!info->port)
+ return;
+
+ cflag = info->tty->termios->c_cflag;
+
+ /* possibly, the tx/rx should be disabled first to do this safely */
+
+ /* change baud-rate and write it to the hardware */
+
+ info->baud = cflag_to_baud(cflag);
+
+#ifndef CONFIG_SVINTO_SIM
+ info->port[REG_BAUD] = cflag_to_etrax_baud(cflag);
+ /* start with default settings and then fill in changes */
+
+ info->rx_ctrl &= ~(0x07); /* 8 bit, no/even parity */
+ info->tx_ctrl &= ~(0x37); /* 8 bit, no/even parity, 1 stop bit, no cts */
+
+ if ((cflag & CSIZE) == CS7) {
+ /* set 7 bit mode */
+ info->tx_ctrl |= 0x01;
+ info->rx_ctrl |= 0x01;
+ }
+
+ if (cflag & CSTOPB) {
+ /* set 2 stop bit mode */
+ info->tx_ctrl |= 0x10;
+ }
+
+ if (cflag & PARENB) {
+ /* enable parity */
+ info->tx_ctrl |= 0x02;
+ info->rx_ctrl |= 0x02;
+ }
+
+ if (cflag & PARODD) {
+ /* set odd parity */
+ info->tx_ctrl |= 0x04;
+ info->rx_ctrl |= 0x04;
+ }
+
+ if (cflag & CRTSCTS) {
+ /* enable automatic CTS handling */
+ info->tx_ctrl |= 0x20;
+ }
+
+ /* make sure the tx and rx are enabled */
+
+ info->tx_ctrl |= 0x40;
+ info->rx_ctrl |= 0x40;
+
+ /* actually write the control regs to the hardware */
+
+ info->port[REG_TR_CTRL] = info->tx_ctrl;
+ info->port[REG_REC_CTRL] = info->rx_ctrl;
+ *((unsigned long *)&info->port[REG_XOFF]) = 0;
+
+#endif /* CONFIG_SVINTO_SIM */
+}
+
+/* start transmitting chars NOW */
+
+static void
+rs_flush_chars(struct tty_struct *tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (info->tr_running
+ || info->xmit.head == info->xmit.tail
+ || tty->stopped
+ || tty->hw_stopped
+ || !info->xmit.buf)
+ return;
+
+#ifdef SERIAL_DEBUG_FLOW
+ printk("rs_flush_chars\n");
+#endif
+
+ /* this protection might not exactly be necessary here */
+
+ save_flags(flags);
+ cli();
+ start_transmit(info);
+ restore_flags(flags);
+}
+
+static int
+rs_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ int c, ret = 0;
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+
+ /* first some sanity checks */
+
+ if (!tty || !info->xmit.buf || !tmp_buf)
+ return 0;
+
+#ifdef SERIAL_DEBUG_DATA
+ if(info->line == SERIAL_DEBUG_LINE)
+ printk("rs_write (%d), status %d\n",
+ count, info->port[REG_STATUS]);
+#endif
+
+#ifdef CONFIG_SVINTO_SIM
+ /* Really simple. The output is here and now. */
+ SIMCOUT(buf, count);
+ return;
+#endif
+ save_flags(flags);
+
+ /* the cli/restore_flags pairs below are needed because the
+ * DMA interrupt handler moves the info->xmit values. the memcpy
+ * needs to be in the critical region unfortunately, because we
+ * need to read xmit values, memcpy, write xmit values in one
+ * atomic operation... this could perhaps be avoided by more clever
+ * design.
+ */
+ if(from_user) {
+ down(&tmp_buf_sem);
+ while (1) {
+ int c1;
+ c = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+ if (count < c)
+ c = count;
+ if (c <= 0)
+ break;
+
+ c -= copy_from_user(tmp_buf, buf, c);
+ if (!c) {
+ if (!ret)
+ ret = -EFAULT;
+ break;
+ }
+ cli();
+ c1 = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+ if (c1 < c)
+ c = c1;
+ memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
+ info->xmit.head = ((info->xmit.head + c) &
+ (SERIAL_XMIT_SIZE-1));
+ restore_flags(flags);
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ up(&tmp_buf_sem);
+ } else {
+ cli();
+ while(1) {
+ c = CIRC_SPACE_TO_END(info->xmit.head,
+ info->xmit.tail,
+ SERIAL_XMIT_SIZE);
+
+ if (count < c)
+ c = count;
+ if (c <= 0)
+ break;
+
+ memcpy(info->xmit.buf + info->xmit.head, buf, c);
+ info->xmit.head = (info->xmit.head + c) &
+ (SERIAL_XMIT_SIZE-1);
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ restore_flags(flags);
+ }
+
+ /* enable transmitter if not running, unless the tty is stopped
+ * this does not need IRQ protection since if tr_running == 0
+ * the IRQ's are not running anyway for this port.
+ */
+
+ if(info->xmit.head != info->xmit.tail
+ && !tty->stopped &&
+ !tty->hw_stopped &&
+ !info->tr_running) {
+ start_transmit(info);
+ }
+
+ return ret;
+}
+
+/* how much space is available in the xmit buffer? */
+
+static int
+rs_write_room(struct tty_struct *tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+ return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+/* How many chars are in the xmit buffer?
+ * This does not include any chars in the transmitter FIFO.
+ * Use wait_until_sent for waiting for FIFO drain.
+ */
+
+static int
+rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+ return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+/* discard everything in the xmit buffer */
+
+static void
+rs_flush_buffer(struct tty_struct *tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
+ info->xmit.head = info->xmit.tail = 0;
+ restore_flags(flags);
+
+ wake_up_interruptible(&tty->write_wait);
+
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ *
+ * Since we don't bother to check for info->x_char in transmit_chars yet,
+ * we don't really implement this function yet.
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+ printk("serial.c:rs_send_xchar not implemented!\n");
+
+ info->x_char = ch;
+ if (ch) {
+ /* Make sure transmit interrupts are on */
+ /* TODO. */
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void
+rs_throttle(struct tty_struct * tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+
+ /* Turn off RTS line (do this atomic) should here be an else ?? */
+
+ save_flags(flags);
+ cli();
+ e100_rts(info, 0);
+ restore_flags(flags);
+}
+
+static void
+rs_unthrottle(struct tty_struct * tty)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ info->x_char = START_CHAR(tty);
+ }
+
+ /* Assert RTS line (do this atomic) */
+
+ save_flags(flags);
+ cli();
+ e100_rts(info, 1);
+ restore_flags(flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int
+get_serial_info(struct e100_serial * info,
+ struct serial_struct * retinfo)
+{
+ struct serial_struct tmp;
+
+ /* this is all probably wrong, there are a lot of fields
+ * here that we don't have in e100_serial and maybe we
+ * should set them to something else than 0.
+ */
+
+ if (!retinfo)
+ return -EFAULT;
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = info->type;
+ tmp.line = info->line;
+ tmp.port = (int)info->port;
+ tmp.irq = info->irq;
+ tmp.flags = info->flags;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+ if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+ return -EFAULT;
+ return 0;
+}
+
+static int
+set_serial_info(struct e100_serial * info,
+ struct serial_struct * new_info)
+{
+ struct serial_struct new_serial;
+ struct e100_serial old_info;
+ int retval = 0;
+
+ if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+ return -EFAULT;
+
+ old_info = *info;
+
+ if(!capable(CAP_SYS_ADMIN)) {
+ if((new_serial.type != info->type) ||
+ (new_serial.close_delay != info->close_delay) ||
+ ((new_serial.flags & ~ASYNC_USR_MASK) !=
+ (info->flags & ~ASYNC_USR_MASK)))
+ return -EPERM;
+ info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+ (new_serial.flags & ASYNC_USR_MASK));
+ goto check_and_exit;
+ }
+
+ if (info->count > 1)
+ return -EBUSY;
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ info->flags = ((info->flags & ~ASYNC_FLAGS) |
+ (new_serial.flags & ASYNC_FLAGS));
+ info->type = new_serial.type;
+ info->close_delay = new_serial.close_delay;
+ info->closing_wait = new_serial.closing_wait;
+#if (LINUX_VERSION_CODE > 0x20100)
+ info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+#endif
+
+ check_and_exit:
+ if(info->flags & ASYNC_INITIALIZED) {
+ change_speed(info);
+ } else
+ retval = startup(info);
+ return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ */
+static int
+get_lsr_info(struct e100_serial * info, unsigned int *value)
+{
+ unsigned int result;
+
+#ifdef CONFIG_SVINTO_SIM
+ /* Always open. */
+ result = TIOCSER_TEMT;
+#else
+ if (*info->ostatusadr & 0x007F) /* something in fifo */
+ result = 0;
+ else
+ result = TIOCSER_TEMT;
+#endif
+
+ if (copy_to_user(value, &result, sizeof(int)))
+ return -EFAULT;
+ return 0;
+}
+
+#ifdef SERIAL_DEBUG_IO
+struct state_str
+{
+ int state;
+ const char *str;
+
+};
+
+const struct state_str control_state_str[]={
+ {TIOCM_DTR, "DTR" },
+ {TIOCM_RTS, "RTS"},
+ {TIOCM_ST, "ST?" },
+ {TIOCM_SR, "SR?" },
+ {TIOCM_CTS, "CTS" },
+ {TIOCM_CD, "CD" },
+ {TIOCM_RI, "RI" },
+ {TIOCM_DSR, "DSR" },
+ {0, NULL }
+};
+
+char *get_control_state_str(int MLines, char *s)
+{
+ int i = 0;
+ s[0]='\0';
+ while (control_state_str[i].str != NULL) {
+ if (MLines & control_state_str[i].state) {
+ if (s[0] != '\0') {
+ strcat(s, ", ");
+ }
+ strcat(s, control_state_str[i].str);
+ }
+ i++;
+ }
+ return s;
+}
+#endif
+
+static int
+get_modem_info(struct e100_serial * info, unsigned int *value)
+{
+ unsigned int result;
+ /* Polarity isn't verified */
+#if 0 /*def SERIAL_DEBUG_IO */
+
+ printk("get_modem_info: RTS: %i DTR: %i CD: %i RI: %i DSR: %i CTS: %i\n",
+ E100_RTS_GET(info),
+ E100_DTR_GET(info),
+ E100_CD_GET(info),
+ E100_RI_GET(info),
+ E100_DSR_GET(info),
+ E100_CTS_GET(info));
+#endif
+ result =
+ (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
+ | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
+ | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
+ | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
+ | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
+ | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
+
+#ifdef SERIAL_DEBUG_IO
+ printk("e100ser: modem state: %i 0x%08X\n", result, result);
+ {
+ char s[100];
+
+ get_control_state_str(result, s);
+ printk("state: %s\n", s);
+ }
+#endif
+ if (copy_to_user(value, &result, sizeof(int)))
+ return -EFAULT;
+ return 0;
+}
+
+
+static int
+set_modem_info(struct e100_serial * info, unsigned int cmd,
+ unsigned int *value)
+{
+ unsigned int arg;
+
+ if (copy_from_user(&arg, value, sizeof(int)))
+ return -EFAULT;
+
+ switch (cmd) {
+ case TIOCMBIS:
+ if (arg & TIOCM_RTS) {
+ e100_rts(info, 1);
+ }
+ if (arg & TIOCM_DTR) {
+ e100_dtr(info, 1);
+ }
+ /* Handle FEMALE behaviour */
+ if (arg & TIOCM_RI) {
+ e100_ri_out(info, 1);
+ }
+ if (arg & TIOCM_CD) {
+ e100_cd_out(info, 1);
+ }
+ break;
+ case TIOCMBIC:
+ if (arg & TIOCM_RTS) {
+ e100_rts(info, 0);
+ }
+ if (arg & TIOCM_DTR) {
+ e100_dtr(info, 0);
+ }
+ /* Handle FEMALE behaviour */
+ if (arg & TIOCM_RI) {
+ e100_ri_out(info, 0);
+ }
+ if (arg & TIOCM_CD) {
+ e100_cd_out(info, 0);
+ }
+ break;
+ case TIOCMSET:
+ e100_rts(info, arg & TIOCM_RTS);
+ e100_dtr(info, arg & TIOCM_DTR);
+ /* Handle FEMALE behaviour */
+ e100_ri_out(info, arg & TIOCM_RI);
+ e100_cd_out(info, arg & TIOCM_CD);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
+static void
+send_break(struct e100_serial * info, int duration)
+{
+ unsigned long flags;
+
+ if (!info->port)
+ return;
+
+ current->state = TASK_INTERRUPTIBLE;
+ current->timeout = jiffies + duration;
+
+ save_flags(flags);
+ cli();
+
+ /* Go to manual mode and set the txd pin to 0 */
+
+ info->tx_ctrl &= 0x3F; /* Clear bit 7 (txd) and 6 (tr_enable) */
+ info->port[REG_TR_CTRL] = info->tx_ctrl;
+
+ /* wait for "duration" jiffies */
+
+ schedule();
+
+ info->tx_ctrl |= (0x80 | 0x40); /* Set bit 7 (txd) and 6 (tr_enable) */
+ info->port[REG_TR_CTRL] = info->tx_ctrl;
+
+ /* the DMA gets awfully confused if we toggle the tranceiver like this
+ * so we need to reset it
+ */
+ *info->ocmdadr = 4;
+
+ restore_flags(flags);
+}
+#else
+static void
+rs_break(struct tty_struct *tty, int break_state)
+{
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info->port)
+ return;
+
+ save_flags(flags);
+ cli();
+ if (break_state == -1) {
+ /* Go to manual mode and set the txd pin to 0 */
+ info->tx_ctrl &= 0x3F; /* Clear bit 7 (txd) and 6 (tr_enable) */
+ } else {
+ info->tx_ctrl |= (0x80 | 0x40); /* Set bit 7 (txd) and 6 (tr_enable) */
+ }
+ info->port[REG_TR_CTRL] = info->tx_ctrl;
+ restore_flags(flags);
+}
+#endif
+
+static int
+rs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ int error;
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+ int retval;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
+ (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
+ case TCSBRK: /* SVID version: non-zero arg --> no break */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ if (signal_pending(current))
+ return -EINTR;
+ if (!arg) {
+ send_break(info, HZ/4); /* 1/4 second */
+ if (signal_pending(current))
+ return -EINTR;
+ }
+ return 0;
+ case TCSBRKP: /* support for POSIX tcsendbreak() */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ if (signal_pending(current))
+ return -EINTR;
+ send_break(info, arg ? arg*(HZ/10) : HZ/4);
+ if (signal_pending(current))
+ return -EINTR;
+ return 0;
+ case TIOCGSOFTCAR:
+ error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
+ if (error)
+ return error;
+ put_fs_long(C_CLOCAL(tty) ? 1 : 0,
+ (unsigned long *) arg);
+ return 0;
+ case TIOCSSOFTCAR:
+ arg = get_fs_long((unsigned long *) arg);
+ tty->termios->c_cflag =
+ ((tty->termios->c_cflag & ~CLOCAL) |
+ (arg ? CLOCAL : 0));
+ return 0;
+#endif
+ case TIOCMGET:
+ return get_modem_info(info, (unsigned int *) arg);
+ case TIOCMBIS:
+ case TIOCMBIC:
+ case TIOCMSET:
+ return set_modem_info(info, cmd, (unsigned int *) arg);
+ case TIOCGSERIAL:
+ return get_serial_info(info,
+ (struct serial_struct *) arg);
+ case TIOCSSERIAL:
+ return set_serial_info(info,
+ (struct serial_struct *) arg);
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, (unsigned int *) arg);
+
+ case TIOCSERGSTRUCT:
+ if (copy_to_user((struct e100_serial *) arg,
+ info, sizeof(struct e100_serial)))
+ return -EFAULT;
+ return 0;
+
+#if defined(CONFIG_RS485)
+ case TIOCSERSETRS485:
+ error = verify_area(VERIFY_WRITE, (void *) arg,
+ sizeof(struct rs485_control));
+
+ if (error)
+ return error;
+
+ return e100_enable_rs485(tty, (struct rs485_control *) arg);
+
+ case TIOCSERWRRS485:
+ error = verify_area(VERIFY_WRITE, (void *) arg,
+ sizeof(struct rs485_write));
+
+ if (error)
+ return error;
+
+ return e100_write_rs485(tty, (struct rs485_write *) arg);
+#endif
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void
+rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+ if (tty->termios->c_cflag == old_termios->c_cflag)
+ return;
+
+ change_speed(info);
+
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_start(tty);
+ }
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ *
+ * This routine is called when the serial port gets closed. First, we
+ * wait for the last remaining data to be sent. Then, we unlink its
+ * S structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void
+rs_close(struct tty_struct *tty, struct file * filp)
+{
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info)
+ return;
+
+ /* interrupts are disabled for this entire function */
+
+ save_flags(flags);
+ cli();
+
+ if (tty_hung_up_p(filp)) {
+ restore_flags(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
+ info->line, info->count);
+#endif
+ if ((tty->count == 1) && (info->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. Info->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk("rs_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+ if (--info->count < 0) {
+ printk("rs_close: bad serial port count for ttyS%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+ if (info->count) {
+ restore_flags(flags);
+ return;
+ }
+ info->flags |= ASYNC_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ info->normal_termios = *tty->termios;
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ info->callout_termios = *tty->termios;
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+ if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, info->closing_wait);
+ /*
+ * At this point we stop accepting input. To do this, we
+ * disable the serial receiver and the DMA receive interrupt.
+ */
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+ e100_disable_serial_data_irq(info);
+#endif
+
+#ifndef CONFIG_SVINTO_SIM
+ e100_disable_rx(info);
+ e100_disable_rxdma_irq(info);
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important as we have a transmit FIFO!
+ */
+ rs_wait_until_sent(tty, HZ);
+ }
+#endif
+
+ shutdown(info);
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer(tty);
+ if (tty->ldisc.flush_buffer)
+ tty->ldisc.flush_buffer(tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(info->close_delay);
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
+ ASYNC_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ restore_flags(flags);
+
+ /* port closed */
+
+#if defined(CONFIG_RS485)
+ if (info->rs485.enabled) {
+ info->rs485.enabled = 0;
+#if defined(CONFIG_RS485_ON_PA)
+ *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
+#endif
+ }
+#endif
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ unsigned long orig_jiffies;
+ struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+ /*
+ * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
+ * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
+ */
+ orig_jiffies = jiffies;
+ while(info->xmit.head != info->xmit.tail || /* More in send queue */
+ (*info->ostatusadr & 0x007f)) { /* more in FIFO */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(1);
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+ set_current_state(TASK_RUNNING);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void
+rs_hangup(struct tty_struct *tty)
+{
+ struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
+ info->tty = 0;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int
+block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct e100_serial *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ unsigned long flags;
+ int retval;
+ int do_clocal = 0, extra_count = 0;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= ASYNC_CALLOUT_ACTIVE;
+ return 0;
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & ASYNC_CALLOUT_ACTIVE) {
+ if (info->normal_termios.c_cflag & CLOCAL)
+ do_clocal = 1;
+ } else {
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+ }
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, info->count is dropped by one, so that
+ * rs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ save_flags(flags);
+ cli();
+ if (!tty_hung_up_p(filp)) {
+ extra_count++;
+ info->count--;
+ }
+ restore_flags(flags);
+ info->blocked_open++;
+ while (1) {
+ save_flags(flags);
+ cli();
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE)) {
+ /* assert RTS and DTR */
+ e100_rts(info, 1);
+ e100_dtr(info, 1);
+ }
+ restore_flags(flags);
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ !(info->flags & ASYNC_CLOSING) && do_clocal)
+ /* && (do_clocal || DCD_IS_ASSERTED) */
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ schedule();
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&info->open_wait, &wait);
+ if (extra_count)
+ info->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttyS%d, count = %d\n",
+ info->line, info->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened.
+ * It performs the serial-specific initialization for the tty structure.
+ */
+static int
+rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct e100_serial *info;
+ int retval, line;
+ unsigned long page;
+
+ /* find which port we want to open */
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+
+ if (line < 0 || line >= NR_PORTS)
+ return -ENODEV;
+
+ /* dont allow opening ports that are not enabled in the HW config */
+
+#ifndef CONFIG_ETRAX100_SERIAL_PORT2
+ if (line == 2)
+ return -ENODEV;
+#endif
+#ifndef CONFIG_ETRAX100_SERIAL_PORT3
+ if (line == 3)
+ return -ENODEV;
+#endif
+
+ /* find the corresponding e100_serial struct in the table */
+
+ info = rs_table + line;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("[%d] rs_open %s%d, count = %d\n", current->pid,
+ tty->driver.name, info->line,
+ info->count);
+#endif
+
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+
+#if (LINUX_VERSION_CODE > 0x20100)
+ info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+#endif
+
+ if (!tmp_buf) {
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page) {
+ return -ENOMEM;
+ }
+ if (tmp_buf)
+ free_page(page);
+ else
+ tmp_buf = (unsigned char *) page;
+ }
+
+ /*
+ * If the port is the middle of closing, bail out now
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ return ((info->flags & ASYNC_HUP_NOTIFY) ?
+ -EAGAIN : -ERESTARTSYS);
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * Start up the serial port
+ */
+
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+ if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->normal_termios;
+ else
+ *tty->termios = info->callout_termios;
+ change_speed(info);
+ }
+
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open ttyS%d successful...\n", info->line);
+#endif
+ return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline int line_info(char *buf, struct e100_serial *info)
+{
+ char stat_buf[30], control, status;
+ int ret;
+ unsigned long flags;
+
+ ret = sprintf(buf, "%d: uart:E100 port:%lX irq:%d",
+ info->line, info->port, info->irq);
+
+ if (!info->port || (info->type == PORT_UNKNOWN)) {
+ ret += sprintf(buf+ret, "\n");
+ return ret;
+ }
+
+ stat_buf[0] = 0;
+ stat_buf[1] = 0;
+ if (E100_RTS_GET(info))
+ strcat(stat_buf, "|RTS");
+ if (E100_CTS_GET(info))
+ strcat(stat_buf, "|CTS");
+ if (E100_DTR_GET(info))
+ strcat(stat_buf, "|DTR");
+ if (E100_DSR_GET(info))
+ strcat(stat_buf, "|DSR");
+ if (E100_CD_GET(info))
+ strcat(stat_buf, "|CD");
+ if (E100_RI_GET(info))
+ strcat(stat_buf, "|RI");
+
+ ret += sprintf(buf+ret, " baud:%d", info->baud);
+
+ ret += sprintf(buf+ret, " tx:%d rx:%d",
+ info->icount.tx, info->icount.rx);
+
+ if (info->icount.frame)
+ ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
+
+ if (info->icount.parity)
+ ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
+
+ if (info->icount.brk)
+ ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
+
+ if (info->icount.overrun)
+ ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
+
+ /*
+ * Last thing is the RS-232 status lines
+ */
+ ret += sprintf(buf+ret, " %s\n", stat_buf+1);
+ return ret;
+}
+
+int rs_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int i, len = 0, l;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver:%s\n",
+ serial_version);
+ for (i = 0; i < NR_PORTS && len < 4000; i++) {
+ l = line_info(page + len, &rs_table[i]);
+ len += l;
+ if (len+begin > off+count)
+ goto done;
+ if (len+begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+done:
+ if (off >= len+begin)
+ return 0;
+ *start = page + (off-begin);
+ return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void
+show_serial_version(void)
+{
+ printk("ETRAX 100LX serial-driver %s, (c) 2000 Axis Communications AB\r\n",
+ serial_version);
+}
+
+/* rs_init inits the driver at boot (using the module_init chain) */
+
+static int __init
+rs_init(void)
+{
+ int i;
+ struct e100_serial *info;
+
+ show_serial_version();
+
+ init_bh(SERIAL_BH, do_serial_bh);
+
+ /* Setup the timed flush handler system */
+
+ init_timer(&flush_timer);
+ flush_timer.function = timed_flush_handler;
+ mod_timer(&flush_timer, jiffies + MAX_FLUSH_TIME);
+
+ /* Initialize the tty_driver structure */
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+#if (LINUX_VERSION_CODE > 0x20100)
+ serial_driver.driver_name = "serial";
+#endif
+ serial_driver.name = "ttyS";
+ serial_driver.major = TTY_MAJOR;
+ serial_driver.minor_start = 64;
+ serial_driver.num = NR_PORTS; /* etrax100 has 4 serial ports */
+ serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+ serial_driver.subtype = SERIAL_TYPE_NORMAL;
+ serial_driver.init_termios = tty_std_termios;
+ serial_driver.init_termios.c_cflag =
+ B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
+ serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
+ serial_driver.refcount = &serial_refcount;
+ serial_driver.table = serial_table;
+ serial_driver.termios = serial_termios;
+ serial_driver.termios_locked = serial_termios_locked;
+
+ serial_driver.open = rs_open;
+ serial_driver.close = rs_close;
+ serial_driver.write = rs_write;
+ /* should we have an rs_put_char as well here ? */
+ serial_driver.flush_chars = rs_flush_chars;
+ serial_driver.write_room = rs_write_room;
+ serial_driver.chars_in_buffer = rs_chars_in_buffer;
+ serial_driver.flush_buffer = rs_flush_buffer;
+ serial_driver.ioctl = rs_ioctl;
+ serial_driver.throttle = rs_throttle;
+ serial_driver.unthrottle = rs_unthrottle;
+ serial_driver.set_termios = rs_set_termios;
+ serial_driver.stop = rs_stop;
+ serial_driver.start = rs_start;
+ serial_driver.hangup = rs_hangup;
+#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
+ serial_driver.break_ctl = rs_break;
+#endif
+#if (LINUX_VERSION_CODE >= 131343)
+ serial_driver.send_xchar = rs_send_xchar;
+ serial_driver.wait_until_sent = rs_wait_until_sent;
+ serial_driver.read_proc = rs_read_proc;
+#endif
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+ callout_driver.name = "cua";
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+#if (LINUX_VERSION_CODE >= 131343)
+ callout_driver.read_proc = 0;
+ callout_driver.proc_entry = 0;
+#endif
+
+ if (tty_register_driver(&serial_driver))
+ panic("Couldn't register serial driver\n");
+ if (tty_register_driver(&callout_driver))
+ panic("Couldn't register callout driver\n");
+
+ /* do some initializing for the separate ports */
+
+ for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
+ info->line = i;
+ info->tty = 0;
+ info->type = PORT_ETRAX100;
+ info->tr_running = 0;
+ info->fifo_magic = 0;
+ info->fifo_didmagic = 0;
+ info->flags = 0;
+ info->close_delay = 5*HZ/10;
+ info->closing_wait = 30*HZ;
+ info->x_char = 0;
+ info->event = 0;
+ info->count = 0;
+ info->blocked_open = 0;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->callout_termios = callout_driver.init_termios;
+ info->normal_termios = serial_driver.init_termios;
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ info->xmit.buf = 0;
+ info->xmit.tail = info->xmit.head = 0;
+
+ printk(KERN_INFO "%s%d at 0x%x is a builtin UART with DMA\n",
+ serial_driver.name, info->line, (unsigned int)info->port);
+ }
+
+#ifndef CONFIG_SVINTO_SIM
+ /* Not needed in simulator. May only complicate stuff. */
+ /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
+ if(request_irq(22, tr_interrupt, SA_INTERRUPT, "serial 0 dma tr", NULL))
+ panic("irq22");
+ if(request_irq(23, rec_interrupt, SA_INTERRUPT, "serial 0 dma rec", NULL))
+ panic("irq23");
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+ if(request_irq(8, ser_interrupt, SA_INTERRUPT, "serial ", NULL))
+ panic("irq8");
+#endif
+ if(request_irq(24, tr_interrupt, SA_INTERRUPT, "serial 1 dma tr", NULL))
+ panic("irq24");
+ if(request_irq(25, rec_interrupt, SA_INTERRUPT, "serial 1 dma rec", NULL))
+ panic("irq25");
+#ifdef CONFIG_ETRAX100_SERIAL_PORT2
+ /* DMA Shared with par0 (and SCSI0 and ATA) */
+ if(request_irq(18, tr_interrupt, SA_SHIRQ, "serial 2 dma tr", NULL))
+ panic("irq18");
+ if(request_irq(19, rec_interrupt, SA_SHIRQ, "serial 2 dma rec", NULL))
+ panic("irq19");
+#endif
+#ifdef CONFIG_ETRAX100_SERIAL_PORT3
+ /* DMA Shared with par1 (and SCSI1 and Extern DMA 0) */
+ if(request_irq(20, tr_interrupt, SA_SHIRQ, "serial 3 dma tr", NULL))
+ panic("irq20");
+ if(request_irq(21, rec_interrupt, SA_SHIRQ, "serial 3 dma rec", NULL))
+ panic("irq21");
+#endif
+#ifdef CONFIG_ETRAX100_SERIAL_FLUSH_DMA_FAST
+ /* TODO: a timeout_interrupt needs to be written that calls timeout_handler */
+ if(request_irq(TIMER1_IRQ_NBR, timeout_interrupt, SA_SHIRQ,
+ "fast serial dma timeout", NULL)) {
+ printk("err: timer1 irq\n");
+ }
+#endif
+#endif /* CONFIG_SVINTO_SIM */
+
+ return 0;
+}
+
+/* this makes sure that rs_init is called during kernel boot */
+
+module_init(rs_init);
+
+/*
+ * register_serial and unregister_serial allows for serial ports to be
+ * configured at run-time, to support PCMCIA modems.
+ */
+int
+register_serial(struct serial_struct *req)
+{
+ return -1;
+}
+
+void unregister_serial(int line)
+{
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)