![Cong Ding](/assets/img/avatar_default.png)
The pointer info is dereferened in line 1009, so it is not necessary to check null again in line 1012. Signed-off-by: Cong Ding <dinggnu@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1327 lines
32 KiB
C
1327 lines
32 KiB
C
/* 68328serial.c: Serial port driver for 68328 microcontroller
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*
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* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
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* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
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* Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
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* Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
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*
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* VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
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* Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
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* Power management support Daniel Potts <danielp@cse.unsw.edu.au>
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* VZ Second Serial Port enable Phil Wilshire
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* 2.4/2.5 port David McCullough
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*/
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#include <asm/dbg.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/serial.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <linux/reboot.h>
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#include <linux/keyboard.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/gfp.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/delay.h>
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#include <asm/uaccess.h>
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/* (es) */
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/* note: perhaps we can murge these files, so that you can just
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* define 1 of them, and they can sort that out for themselves
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*/
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#if defined(CONFIG_M68EZ328)
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#include <asm/MC68EZ328.h>
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#else
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#if defined(CONFIG_M68VZ328)
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#include <asm/MC68VZ328.h>
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#else
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#include <asm/MC68328.h>
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#endif /* CONFIG_M68VZ328 */
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#endif /* CONFIG_M68EZ328 */
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/* Turn off usage of real serial interrupt code, to "support" Copilot */
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#ifdef CONFIG_XCOPILOT_BUGS
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#undef USE_INTS
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#else
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#define USE_INTS
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#endif
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/*
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* I believe this is the optimal setting that reduces the number of interrupts.
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* At high speeds the output might become a little "bursted" (use USTCNT_TXHE
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* if that bothers you), but in most cases it will not, since we try to
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* transmit characters every time rs_interrupt is called. Thus, quite often
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* you'll see that a receive interrupt occures before the transmit one.
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* -- Vladimir Gurevich
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*/
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#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
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/*
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* 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
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* "Old data interrupt" which occures whenever the data stay in the FIFO
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* longer than 30 bits time. This allows us to use FIFO without compromising
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* latency. '328 does not have this feature and without the real 328-based
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* board I would assume that RXRE is the safest setting.
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*
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* For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
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* interrupts. RXFE (receive queue full) causes the system to lose data
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* at least at 115200 baud
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*
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* If your board is busy doing other stuff, you might consider to use
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* RXRE (data ready intrrupt) instead.
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*
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* The other option is to make these INTR masks run-time configurable, so
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* that people can dynamically adapt them according to the current usage.
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* -- Vladimir Gurevich
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*/
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/* (es) */
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#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
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#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
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#elif defined(CONFIG_M68328)
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#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
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#else
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#error Please, define the Rx interrupt events for your CPU
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#endif
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/* (/es) */
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/*
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* This is our internal structure for each serial port's state.
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*/
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struct m68k_serial {
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struct tty_port tport;
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char is_cons; /* Is this our console. */
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int magic;
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int baud_base;
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int port;
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int irq;
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int type; /* UART type */
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int custom_divisor;
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int x_char; /* xon/xoff character */
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int line;
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unsigned char *xmit_buf;
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int xmit_head;
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int xmit_tail;
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int xmit_cnt;
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};
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#define SERIAL_MAGIC 0x5301
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/*
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* Define the number of ports supported and their irqs.
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*/
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#define NR_PORTS 1
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static struct m68k_serial m68k_soft[NR_PORTS];
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static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
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/* multiple ports are contiguous in memory */
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m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
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struct tty_driver *serial_driver;
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static void change_speed(struct m68k_serial *info, struct tty_struct *tty);
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/*
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* Setup for console. Argument comes from the boot command line.
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*/
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/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
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#ifdef CONFIG_M68VZ328
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#define CONSOLE_BAUD_RATE 19200
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#define DEFAULT_CBAUD B19200
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#endif
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#ifndef CONSOLE_BAUD_RATE
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#define CONSOLE_BAUD_RATE 9600
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#define DEFAULT_CBAUD B9600
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#endif
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static int m68328_console_initted = 0;
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static int m68328_console_baud = CONSOLE_BAUD_RATE;
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static int m68328_console_cbaud = DEFAULT_CBAUD;
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static inline int serial_paranoia_check(struct m68k_serial *info,
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char *name, const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char *badmagic =
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"Warning: bad magic number for serial struct %s in %s\n";
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static const char *badinfo =
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"Warning: null m68k_serial for %s in %s\n";
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if (!info) {
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printk(badinfo, name, routine);
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return 1;
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}
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if (info->magic != SERIAL_MAGIC) {
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printk(badmagic, name, routine);
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return 1;
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}
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#endif
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return 0;
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}
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/*
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* This is used to figure out the divisor speeds and the timeouts
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*/
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static int baud_table[] = {
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0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
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9600, 19200, 38400, 57600, 115200, 0 };
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/* Utility routines */
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static inline int get_baud(struct m68k_serial *ss)
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{
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unsigned long result = 115200;
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unsigned short int baud = uart_addr[ss->line].ubaud;
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if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
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result >>= GET_FIELD(baud, UBAUD_DIVIDE);
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return result;
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}
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/*
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* ------------------------------------------------------------
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* rs_stop() and rs_start()
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*
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* This routines are called before setting or resetting tty->stopped.
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* They enable or disable transmitter interrupts, as necessary.
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* ------------------------------------------------------------
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*/
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static void rs_stop(struct tty_struct *tty)
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{
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struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
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m68328_uart *uart = &uart_addr[info->line];
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_stop"))
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return;
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local_irq_save(flags);
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uart->ustcnt &= ~USTCNT_TXEN;
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local_irq_restore(flags);
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}
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static int rs_put_char(char ch)
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{
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unsigned long flags;
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int loops = 0;
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local_irq_save(flags);
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while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
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loops++;
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udelay(5);
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}
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UTX_TXDATA = ch;
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udelay(5);
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local_irq_restore(flags);
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return 1;
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}
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static void rs_start(struct tty_struct *tty)
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{
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struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
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m68328_uart *uart = &uart_addr[info->line];
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unsigned long flags;
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if (serial_paranoia_check(info, tty->name, "rs_start"))
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return;
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local_irq_save(flags);
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if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
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#ifdef USE_INTS
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uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
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#else
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uart->ustcnt |= USTCNT_TXEN;
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#endif
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}
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local_irq_restore(flags);
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}
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static void receive_chars(struct m68k_serial *info, unsigned short rx)
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{
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m68328_uart *uart = &uart_addr[info->line];
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unsigned char ch, flag;
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/*
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* This do { } while() loop will get ALL chars out of Rx FIFO
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*/
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#ifndef CONFIG_XCOPILOT_BUGS
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do {
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#endif
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ch = GET_FIELD(rx, URX_RXDATA);
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if(info->is_cons) {
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if(URX_BREAK & rx) { /* whee, break received */
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return;
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#ifdef CONFIG_MAGIC_SYSRQ
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} else if (ch == 0x10) { /* ^P */
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show_state();
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show_free_areas(0);
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show_buffers();
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/* show_net_buffers(); */
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return;
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} else if (ch == 0x12) { /* ^R */
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emergency_restart();
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return;
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#endif /* CONFIG_MAGIC_SYSRQ */
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}
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}
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flag = TTY_NORMAL;
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if (rx & URX_PARITY_ERROR)
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flag = TTY_PARITY;
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else if (rx & URX_OVRUN)
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flag = TTY_OVERRUN;
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else if (rx & URX_FRAME_ERROR)
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flag = TTY_FRAME;
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tty_insert_flip_char(&info->tport, ch, flag);
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#ifndef CONFIG_XCOPILOT_BUGS
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} while((rx = uart->urx.w) & URX_DATA_READY);
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#endif
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tty_schedule_flip(&info->tport);
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}
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static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
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{
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m68328_uart *uart = &uart_addr[info->line];
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if (info->x_char) {
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/* Send next char */
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uart->utx.b.txdata = info->x_char;
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info->x_char = 0;
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goto clear_and_return;
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}
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if ((info->xmit_cnt <= 0) || !tty || tty->stopped) {
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/* That's peculiar... TX ints off */
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uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
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goto clear_and_return;
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}
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/* Send char */
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uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
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info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
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info->xmit_cnt--;
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if(info->xmit_cnt <= 0) {
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/* All done for now... TX ints off */
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uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
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goto clear_and_return;
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}
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clear_and_return:
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/* Clear interrupt (should be auto)*/
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return;
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}
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/*
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* This is the serial driver's generic interrupt routine
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*/
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irqreturn_t rs_interrupt(int irq, void *dev_id)
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{
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struct m68k_serial *info = dev_id;
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struct tty_struct *tty = tty_port_tty_get(&info->tport);
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m68328_uart *uart;
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unsigned short rx;
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unsigned short tx;
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uart = &uart_addr[info->line];
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rx = uart->urx.w;
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#ifdef USE_INTS
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tx = uart->utx.w;
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if (rx & URX_DATA_READY)
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receive_chars(info, rx);
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if (tx & UTX_TX_AVAIL)
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transmit_chars(info, tty);
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#else
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receive_chars(info, rx);
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#endif
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tty_kref_put(tty);
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return IRQ_HANDLED;
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}
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static int startup(struct m68k_serial *info, struct tty_struct *tty)
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{
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m68328_uart *uart = &uart_addr[info->line];
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unsigned long flags;
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if (info->tport.flags & ASYNC_INITIALIZED)
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return 0;
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if (!info->xmit_buf) {
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info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
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if (!info->xmit_buf)
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return -ENOMEM;
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}
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local_irq_save(flags);
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/*
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* Clear the FIFO buffers and disable them
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* (they will be reenabled in change_speed())
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*/
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uart->ustcnt = USTCNT_UEN;
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uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
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(void)uart->urx.w;
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/*
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* Finally, enable sequencing and interrupts
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*/
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#ifdef USE_INTS
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uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
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USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
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#else
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uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
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#endif
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if (tty)
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clear_bit(TTY_IO_ERROR, &tty->flags);
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info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
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/*
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* and set the speed of the serial port
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*/
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change_speed(info, tty);
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info->tport.flags |= ASYNC_INITIALIZED;
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local_irq_restore(flags);
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return 0;
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}
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/*
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* This routine will shutdown a serial port; interrupts are disabled, and
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* DTR is dropped if the hangup on close termio flag is on.
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*/
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static void shutdown(struct m68k_serial *info, struct tty_struct *tty)
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{
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m68328_uart *uart = &uart_addr[info->line];
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unsigned long flags;
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uart->ustcnt = 0; /* All off! */
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if (!(info->tport.flags & ASYNC_INITIALIZED))
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return;
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local_irq_save(flags);
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if (info->xmit_buf) {
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free_page((unsigned long) info->xmit_buf);
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info->xmit_buf = 0;
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}
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if (tty)
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set_bit(TTY_IO_ERROR, &tty->flags);
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info->tport.flags &= ~ASYNC_INITIALIZED;
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local_irq_restore(flags);
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}
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struct {
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int divisor, prescale;
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}
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#ifndef CONFIG_M68VZ328
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hw_baud_table[18] = {
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{0,0}, /* 0 */
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{0,0}, /* 50 */
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{0,0}, /* 75 */
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{0,0}, /* 110 */
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{0,0}, /* 134 */
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{0,0}, /* 150 */
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{0,0}, /* 200 */
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{7,0x26}, /* 300 */
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{6,0x26}, /* 600 */
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{5,0x26}, /* 1200 */
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{0,0}, /* 1800 */
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{4,0x26}, /* 2400 */
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{3,0x26}, /* 4800 */
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{2,0x26}, /* 9600 */
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{1,0x26}, /* 19200 */
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{0,0x26}, /* 38400 */
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{1,0x38}, /* 57600 */
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{0,0x38}, /* 115200 */
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};
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#else
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hw_baud_table[18] = {
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{0,0}, /* 0 */
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{0,0}, /* 50 */
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{0,0}, /* 75 */
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{0,0}, /* 110 */
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{0,0}, /* 134 */
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{0,0}, /* 150 */
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{0,0}, /* 200 */
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{0,0}, /* 300 */
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{7,0x26}, /* 600 */
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{6,0x26}, /* 1200 */
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{0,0}, /* 1800 */
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{5,0x26}, /* 2400 */
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{4,0x26}, /* 4800 */
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{3,0x26}, /* 9600 */
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{2,0x26}, /* 19200 */
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{1,0x26}, /* 38400 */
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{0,0x26}, /* 57600 */
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{1,0x38}, /* 115200 */
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};
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#endif
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/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
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|
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/*
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* This routine is called to set the UART divisor registers to match
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* the specified baud rate for a serial port.
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*/
|
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static void change_speed(struct m68k_serial *info, struct tty_struct *tty)
|
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{
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m68328_uart *uart = &uart_addr[info->line];
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unsigned short port;
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unsigned short ustcnt;
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unsigned cflag;
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int i;
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|
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cflag = tty->termios.c_cflag;
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if (!(port = info->port))
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return;
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|
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ustcnt = uart->ustcnt;
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uart->ustcnt = ustcnt & ~USTCNT_TXEN;
|
|
|
|
i = cflag & CBAUD;
|
|
if (i & CBAUDEX) {
|
|
i = (i & ~CBAUDEX) + B38400;
|
|
}
|
|
|
|
uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
|
|
PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
|
|
|
|
ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
|
|
|
|
if ((cflag & CSIZE) == CS8)
|
|
ustcnt |= USTCNT_8_7;
|
|
|
|
if (cflag & CSTOPB)
|
|
ustcnt |= USTCNT_STOP;
|
|
|
|
if (cflag & PARENB)
|
|
ustcnt |= USTCNT_PARITYEN;
|
|
if (cflag & PARODD)
|
|
ustcnt |= USTCNT_ODD_EVEN;
|
|
|
|
#ifdef CONFIG_SERIAL_68328_RTS_CTS
|
|
if (cflag & CRTSCTS) {
|
|
uart->utx.w &= ~ UTX_NOCTS;
|
|
} else {
|
|
uart->utx.w |= UTX_NOCTS;
|
|
}
|
|
#endif
|
|
|
|
ustcnt |= USTCNT_TXEN;
|
|
|
|
uart->ustcnt = ustcnt;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Fair output driver allows a process to speak.
|
|
*/
|
|
static void rs_fair_output(void)
|
|
{
|
|
int left; /* Output no more than that */
|
|
unsigned long flags;
|
|
struct m68k_serial *info = &m68k_soft[0];
|
|
char c;
|
|
|
|
if (info == 0) return;
|
|
if (info->xmit_buf == 0) return;
|
|
|
|
local_irq_save(flags);
|
|
left = info->xmit_cnt;
|
|
while (left != 0) {
|
|
c = info->xmit_buf[info->xmit_tail];
|
|
info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
|
|
info->xmit_cnt--;
|
|
local_irq_restore(flags);
|
|
|
|
rs_put_char(c);
|
|
|
|
local_irq_save(flags);
|
|
left = min(info->xmit_cnt, left-1);
|
|
}
|
|
|
|
/* Last character is being transmitted now (hopefully). */
|
|
udelay(5);
|
|
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* m68k_console_print is registered for printk.
|
|
*/
|
|
void console_print_68328(const char *p)
|
|
{
|
|
char c;
|
|
|
|
while((c=*(p++)) != 0) {
|
|
if(c == '\n')
|
|
rs_put_char('\r');
|
|
rs_put_char(c);
|
|
}
|
|
|
|
/* Comment this if you want to have a strict interrupt-driven output */
|
|
rs_fair_output();
|
|
|
|
return;
|
|
}
|
|
|
|
static void rs_set_ldisc(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
|
|
return;
|
|
|
|
info->is_cons = (tty->termios.c_line == N_TTY);
|
|
|
|
printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
m68328_uart *uart = &uart_addr[info->line];
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
|
return;
|
|
#ifndef USE_INTS
|
|
for(;;) {
|
|
#endif
|
|
|
|
/* Enable transmitter */
|
|
local_irq_save(flags);
|
|
|
|
if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
|
|
!info->xmit_buf) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
#ifdef USE_INTS
|
|
uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
|
|
#else
|
|
uart->ustcnt |= USTCNT_TXEN;
|
|
#endif
|
|
|
|
#ifdef USE_INTS
|
|
if (uart->utx.w & UTX_TX_AVAIL) {
|
|
#else
|
|
if (1) {
|
|
#endif
|
|
/* Send char */
|
|
uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
|
|
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
info->xmit_cnt--;
|
|
}
|
|
|
|
#ifndef USE_INTS
|
|
while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
|
|
}
|
|
#endif
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
extern void console_printn(const char * b, int count);
|
|
|
|
static int rs_write(struct tty_struct * tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
int c, total = 0;
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
m68328_uart *uart = &uart_addr[info->line];
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
|
return 0;
|
|
|
|
if (!tty || !info->xmit_buf)
|
|
return 0;
|
|
|
|
local_save_flags(flags);
|
|
while (1) {
|
|
local_irq_disable();
|
|
c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
|
|
SERIAL_XMIT_SIZE - info->xmit_head));
|
|
local_irq_restore(flags);
|
|
|
|
if (c <= 0)
|
|
break;
|
|
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
|
|
|
local_irq_disable();
|
|
info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
|
|
info->xmit_cnt += c;
|
|
local_irq_restore(flags);
|
|
buf += c;
|
|
count -= c;
|
|
total += c;
|
|
}
|
|
|
|
if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
|
|
/* Enable transmitter */
|
|
local_irq_disable();
|
|
#ifndef USE_INTS
|
|
while(info->xmit_cnt) {
|
|
#endif
|
|
|
|
uart->ustcnt |= USTCNT_TXEN;
|
|
#ifdef USE_INTS
|
|
uart->ustcnt |= USTCNT_TX_INTR_MASK;
|
|
#else
|
|
while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
|
|
#endif
|
|
if (uart->utx.w & UTX_TX_AVAIL) {
|
|
uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
|
|
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
|
|
info->xmit_cnt--;
|
|
}
|
|
|
|
#ifndef USE_INTS
|
|
}
|
|
#endif
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
int ret;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
|
return 0;
|
|
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
|
|
if (ret < 0)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
|
return 0;
|
|
return info->xmit_cnt;
|
|
}
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
|
return;
|
|
local_irq_save(flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
local_irq_restore(flags);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* 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 m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty))
|
|
info->x_char = STOP_CHAR(tty);
|
|
|
|
/* Turn off RTS line (do this atomic) */
|
|
}
|
|
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
|
return;
|
|
|
|
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) */
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_ioctl() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static int get_serial_info(struct m68k_serial * info,
|
|
struct serial_struct * retinfo)
|
|
{
|
|
struct serial_struct tmp;
|
|
|
|
if (!retinfo)
|
|
return -EFAULT;
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.type = info->type;
|
|
tmp.line = info->line;
|
|
tmp.port = info->port;
|
|
tmp.irq = info->irq;
|
|
tmp.flags = info->tport.flags;
|
|
tmp.baud_base = info->baud_base;
|
|
tmp.close_delay = info->tport.close_delay;
|
|
tmp.closing_wait = info->tport.closing_wait;
|
|
tmp.custom_divisor = info->custom_divisor;
|
|
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty,
|
|
struct serial_struct * new_info)
|
|
{
|
|
struct tty_port *port = &info->tport;
|
|
struct serial_struct new_serial;
|
|
struct m68k_serial old_info;
|
|
int retval = 0;
|
|
|
|
if (!new_info)
|
|
return -EFAULT;
|
|
if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
|
|
return -EFAULT;
|
|
old_info = *info;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
if ((new_serial.baud_base != info->baud_base) ||
|
|
(new_serial.type != info->type) ||
|
|
(new_serial.close_delay != port->close_delay) ||
|
|
((new_serial.flags & ~ASYNC_USR_MASK) !=
|
|
(port->flags & ~ASYNC_USR_MASK)))
|
|
return -EPERM;
|
|
port->flags = ((port->flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
info->custom_divisor = new_serial.custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
if (port->count > 1)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
|
|
info->baud_base = new_serial.baud_base;
|
|
port->flags = ((port->flags & ~ASYNC_FLAGS) |
|
|
(new_serial.flags & ASYNC_FLAGS));
|
|
info->type = new_serial.type;
|
|
port->close_delay = new_serial.close_delay;
|
|
port->closing_wait = new_serial.closing_wait;
|
|
|
|
check_and_exit:
|
|
retval = startup(info, tty);
|
|
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 m68k_serial * info, unsigned int *value)
|
|
{
|
|
#ifdef CONFIG_SERIAL_68328_RTS_CTS
|
|
m68328_uart *uart = &uart_addr[info->line];
|
|
#endif
|
|
unsigned char status;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
#ifdef CONFIG_SERIAL_68328_RTS_CTS
|
|
status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
|
|
#else
|
|
status = 0;
|
|
#endif
|
|
local_irq_restore(flags);
|
|
return put_user(status, value);
|
|
}
|
|
|
|
/*
|
|
* This routine sends a break character out the serial port.
|
|
*/
|
|
static void send_break(struct m68k_serial * info, unsigned int duration)
|
|
{
|
|
m68328_uart *uart = &uart_addr[info->line];
|
|
unsigned long flags;
|
|
if (!info->port)
|
|
return;
|
|
local_irq_save(flags);
|
|
#ifdef USE_INTS
|
|
uart->utx.w |= UTX_SEND_BREAK;
|
|
msleep_interruptible(duration);
|
|
uart->utx.w &= ~UTX_SEND_BREAK;
|
|
#endif
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int rs_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
|
|
int retval;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
|
|
(cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
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 (!arg)
|
|
send_break(info, 250); /* 1/4 second */
|
|
return 0;
|
|
case TCSBRKP: /* support for POSIX tcsendbreak() */
|
|
retval = tty_check_change(tty);
|
|
if (retval)
|
|
return retval;
|
|
tty_wait_until_sent(tty, 0);
|
|
send_break(info, arg ? arg*(100) : 250);
|
|
return 0;
|
|
case TIOCGSERIAL:
|
|
return get_serial_info(info,
|
|
(struct serial_struct *) arg);
|
|
case TIOCSSERIAL:
|
|
return set_serial_info(info, tty,
|
|
(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 m68k_serial *) arg,
|
|
info, sizeof(struct m68k_serial)))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
change_speed(info, tty);
|
|
|
|
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 m68k_serial * info = (struct m68k_serial *)tty->driver_data;
|
|
struct tty_port *port = &info->tport;
|
|
m68328_uart *uart = &uart_addr[info->line];
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_close"))
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
if ((tty->count == 1) && (port->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, "
|
|
"port->count is %d\n", port->count);
|
|
port->count = 1;
|
|
}
|
|
if (--port->count < 0) {
|
|
printk("rs_close: bad serial port count for ttyS%d: %d\n",
|
|
info->line, port->count);
|
|
port->count = 0;
|
|
}
|
|
if (port->count) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
port->flags |= ASYNC_CLOSING;
|
|
/*
|
|
* 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 (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
tty_wait_until_sent(tty, port->closing_wait);
|
|
/*
|
|
* At this point we stop accepting input. To do this, we
|
|
* disable the receive line status interrupts, and tell the
|
|
* interrupt driver to stop checking the data ready bit in the
|
|
* line status register.
|
|
*/
|
|
|
|
uart->ustcnt &= ~USTCNT_RXEN;
|
|
uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
|
|
|
|
shutdown(info, tty);
|
|
rs_flush_buffer(tty);
|
|
|
|
tty_ldisc_flush(tty);
|
|
tty->closing = 0;
|
|
tty_port_tty_set(&info->tport, NULL);
|
|
#warning "This is not and has never been valid so fix it"
|
|
#if 0
|
|
if (tty->ldisc.num != ldiscs[N_TTY].num) {
|
|
if (tty->ldisc.close)
|
|
(tty->ldisc.close)(tty);
|
|
tty->ldisc = ldiscs[N_TTY];
|
|
tty->termios.c_line = N_TTY;
|
|
if (tty->ldisc.open)
|
|
(tty->ldisc.open)(tty);
|
|
}
|
|
#endif
|
|
if (port->blocked_open) {
|
|
if (port->close_delay)
|
|
msleep_interruptible(jiffies_to_msecs(port->close_delay));
|
|
wake_up_interruptible(&port->open_wait);
|
|
}
|
|
port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
|
|
wake_up_interruptible(&port->close_wait);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
*/
|
|
void rs_hangup(struct tty_struct *tty)
|
|
{
|
|
struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_hangup"))
|
|
return;
|
|
|
|
rs_flush_buffer(tty);
|
|
shutdown(info, tty);
|
|
info->tport.count = 0;
|
|
info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
tty_port_tty_set(&info->tport, NULL);
|
|
wake_up_interruptible(&info->tport.open_wait);
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its S structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
int rs_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct m68k_serial *info;
|
|
int retval;
|
|
|
|
info = &m68k_soft[tty->index];
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_open"))
|
|
return -ENODEV;
|
|
|
|
info->tport.count++;
|
|
tty->driver_data = info;
|
|
tty_port_tty_set(&info->tport, tty);
|
|
|
|
/*
|
|
* Start up serial port
|
|
*/
|
|
retval = startup(info, tty);
|
|
if (retval)
|
|
return retval;
|
|
|
|
return tty_port_block_til_ready(&info->tport, tty, filp);
|
|
}
|
|
|
|
/* Finally, routines used to initialize the serial driver. */
|
|
|
|
static void show_serial_version(void)
|
|
{
|
|
printk("MC68328 serial driver version 1.00\n");
|
|
}
|
|
|
|
static const struct tty_operations rs_ops = {
|
|
.open = rs_open,
|
|
.close = rs_close,
|
|
.write = rs_write,
|
|
.flush_chars = rs_flush_chars,
|
|
.write_room = rs_write_room,
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
.flush_buffer = rs_flush_buffer,
|
|
.ioctl = rs_ioctl,
|
|
.throttle = rs_throttle,
|
|
.unthrottle = rs_unthrottle,
|
|
.set_termios = rs_set_termios,
|
|
.stop = rs_stop,
|
|
.start = rs_start,
|
|
.hangup = rs_hangup,
|
|
.set_ldisc = rs_set_ldisc,
|
|
};
|
|
|
|
static const struct tty_port_operations rs_port_ops = {
|
|
};
|
|
|
|
/* rs_init inits the driver */
|
|
static int __init
|
|
rs68328_init(void)
|
|
{
|
|
unsigned long flags;
|
|
int i;
|
|
struct m68k_serial *info;
|
|
|
|
serial_driver = alloc_tty_driver(NR_PORTS);
|
|
if (!serial_driver)
|
|
return -ENOMEM;
|
|
|
|
show_serial_version();
|
|
|
|
/* Initialize the tty_driver structure */
|
|
/* SPARC: Not all of this is exactly right for us. */
|
|
|
|
serial_driver->name = "ttyS";
|
|
serial_driver->major = TTY_MAJOR;
|
|
serial_driver->minor_start = 64;
|
|
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 =
|
|
m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(serial_driver, &rs_ops);
|
|
|
|
local_irq_save(flags);
|
|
|
|
for(i=0;i<NR_PORTS;i++) {
|
|
|
|
info = &m68k_soft[i];
|
|
tty_port_init(&info->tport);
|
|
info->tport.ops = &rs_port_ops;
|
|
info->magic = SERIAL_MAGIC;
|
|
info->port = (int) &uart_addr[i];
|
|
info->irq = uart_irqs[i];
|
|
info->custom_divisor = 16;
|
|
info->x_char = 0;
|
|
info->line = i;
|
|
info->is_cons = 1; /* Means shortcuts work */
|
|
|
|
printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
|
|
info->port, info->irq);
|
|
printk(" is a builtin MC68328 UART\n");
|
|
|
|
#ifdef CONFIG_M68VZ328
|
|
if (i > 0 )
|
|
PJSEL &= 0xCF; /* PSW enable second port output */
|
|
#endif
|
|
|
|
if (request_irq(uart_irqs[i],
|
|
rs_interrupt,
|
|
0,
|
|
"M68328_UART", info))
|
|
panic("Unable to attach 68328 serial interrupt\n");
|
|
|
|
tty_port_link_device(&info->tport, serial_driver, i);
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
if (tty_register_driver(serial_driver)) {
|
|
put_tty_driver(serial_driver);
|
|
for (i = 0; i < NR_PORTS; i++)
|
|
tty_port_destroy(&m68k_soft[i].tport);
|
|
printk(KERN_ERR "Couldn't register serial driver\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(rs68328_init);
|
|
|
|
|
|
|
|
static void m68328_set_baud(void)
|
|
{
|
|
unsigned short ustcnt;
|
|
int i;
|
|
|
|
ustcnt = USTCNT;
|
|
USTCNT = ustcnt & ~USTCNT_TXEN;
|
|
|
|
again:
|
|
for (i = 0; i < ARRAY_SIZE(baud_table); i++)
|
|
if (baud_table[i] == m68328_console_baud)
|
|
break;
|
|
if (i >= ARRAY_SIZE(baud_table)) {
|
|
m68328_console_baud = 9600;
|
|
goto again;
|
|
}
|
|
|
|
UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
|
|
PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
|
|
ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
|
|
ustcnt |= USTCNT_8_7;
|
|
ustcnt |= USTCNT_TXEN;
|
|
USTCNT = ustcnt;
|
|
m68328_console_initted = 1;
|
|
return;
|
|
}
|
|
|
|
|
|
int m68328_console_setup(struct console *cp, char *arg)
|
|
{
|
|
int i, n = CONSOLE_BAUD_RATE;
|
|
|
|
if (!cp)
|
|
return(-1);
|
|
|
|
if (arg)
|
|
n = simple_strtoul(arg,NULL,0);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(baud_table); i++)
|
|
if (baud_table[i] == n)
|
|
break;
|
|
if (i < ARRAY_SIZE(baud_table)) {
|
|
m68328_console_baud = n;
|
|
m68328_console_cbaud = 0;
|
|
if (i > 15) {
|
|
m68328_console_cbaud |= CBAUDEX;
|
|
i -= 15;
|
|
}
|
|
m68328_console_cbaud |= i;
|
|
}
|
|
|
|
m68328_set_baud(); /* make sure baud rate changes */
|
|
return(0);
|
|
}
|
|
|
|
|
|
static struct tty_driver *m68328_console_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return serial_driver;
|
|
}
|
|
|
|
|
|
void m68328_console_write (struct console *co, const char *str,
|
|
unsigned int count)
|
|
{
|
|
if (!m68328_console_initted)
|
|
m68328_set_baud();
|
|
while (count--) {
|
|
if (*str == '\n')
|
|
rs_put_char('\r');
|
|
rs_put_char( *str++ );
|
|
}
|
|
}
|
|
|
|
|
|
static struct console m68328_driver = {
|
|
.name = "ttyS",
|
|
.write = m68328_console_write,
|
|
.device = m68328_console_device,
|
|
.setup = m68328_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
|
|
static int __init m68328_console_init(void)
|
|
{
|
|
register_console(&m68328_driver);
|
|
return 0;
|
|
}
|
|
|
|
console_initcall(m68328_console_init);
|