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Message-ID: <CAMuHMdW6r_QszpXTj1FLtOfjzPqDCU7UcF6OT+7MgW8uo01KYA@mail.gmail.com>
Date: Fri, 18 Dec 2015 15:27:21 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Frederik Völkel <frederik.voelkel@....de>
Cc: Jiri Slaby <jslaby@...e.com>, Greg KH <gregkh@...uxfoundation.org>,
"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-kernel@...cs.fau.de, Lukas Braun <lukas.braun@....de>,
"Linux/m68k" <linux-m68k@...r.kernel.org>,
uClinux development list <uclinux-dev@...inux.org>
Subject: Re: [PATCH] serial: Remove 68328 driver
CC linux-m68k, uClinux-dev
On Fri, Dec 18, 2015 at 12:28 PM, Frederik Völkel
<frederik.voelkel@....de> wrote:
> It's old, messy and mostly unmaintained.
> Remove it as suggested by Peter Hurley and Alan.
>
> Signed-off-by: Frederik Völkel <frederik.voelkel@....de>
> Signed-off-by: Lukas Braun <lukas.braun@....de>
> ---
> Should we remove other drivers like framebuffer as well?
> It is probably useless without serial support.
> ---
> drivers/tty/serial/68328serial.c | 1322 --------------------------------------
> drivers/tty/serial/Kconfig | 11 -
> drivers/tty/serial/Makefile | 1 -
> 3 files changed, 1334 deletions(-)
> delete mode 100644 drivers/tty/serial/68328serial.c
>
> diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
> deleted file mode 100644
> index 0140ba4..0000000
> --- a/drivers/tty/serial/68328serial.c
> +++ /dev/null
> @@ -1,1322 +0,0 @@
> -/* 68328serial.c: Serial port driver for 68328 microcontroller
> - *
> - * Copyright (C) 1995 David S. Miller <davem@...p.rutgers.edu>
> - * Copyright (C) 1998 Kenneth Albanowski <kjahds@...hds.com>
> - * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@...inux.org>
> - * Copyright (C) 1999 Vladimir Gurevich <vgurevic@...co.com>
> - * Copyright (C) 2002-2003 David McCullough <davidm@...pgear.com>
> - * Copyright (C) 2002 Greg Ungerer <gerg@...pgear.com>
> - *
> - * VZ Support/Fixes Evan Stawnyczy <e@...eo.ca>
> - * Multiple UART support Daniel Potts <danielp@....unsw.edu.au>
> - * Power management support Daniel Potts <danielp@....unsw.edu.au>
> - * VZ Second Serial Port enable Phil Wilshire
> - * 2.4/2.5 port David McCullough
> - */
> -
> -#include <linux/module.h>
> -#include <linux/errno.h>
> -#include <linux/serial.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>
> -#include <linux/kernel.h>
> -#include <linux/console.h>
> -#include <linux/reboot.h>
> -#include <linux/keyboard.h>
> -#include <linux/init.h>
> -#include <linux/pm.h>
> -#include <linux/bitops.h>
> -#include <linux/delay.h>
> -#include <linux/gfp.h>
> -
> -#include <asm/io.h>
> -#include <asm/irq.h>
> -#include <asm/delay.h>
> -#include <asm/uaccess.h>
> -
> -/* (es) */
> -/* note: perhaps we can murge these files, so that you can just
> - * define 1 of them, and they can sort that out for themselves
> - */
> -#if defined(CONFIG_M68EZ328)
> -#include <asm/MC68EZ328.h>
> -#else
> -#if defined(CONFIG_M68VZ328)
> -#include <asm/MC68VZ328.h>
> -#else
> -#include <asm/MC68328.h>
> -#endif /* CONFIG_M68VZ328 */
> -#endif /* CONFIG_M68EZ328 */
> -
> -/* Turn off usage of real serial interrupt code, to "support" Copilot */
> -#ifdef CONFIG_XCOPILOT_BUGS
> -#undef USE_INTS
> -#else
> -#define USE_INTS
> -#endif
> -
> -/*
> - * I believe this is the optimal setting that reduces the number of interrupts.
> - * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
> - * if that bothers you), but in most cases it will not, since we try to
> - * transmit characters every time rs_interrupt is called. Thus, quite often
> - * you'll see that a receive interrupt occures before the transmit one.
> - * -- Vladimir Gurevich
> - */
> -#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
> -
> -/*
> - * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
> - * "Old data interrupt" which occures whenever the data stay in the FIFO
> - * longer than 30 bits time. This allows us to use FIFO without compromising
> - * latency. '328 does not have this feature and without the real 328-based
> - * board I would assume that RXRE is the safest setting.
> - *
> - * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
> - * interrupts. RXFE (receive queue full) causes the system to lose data
> - * at least at 115200 baud
> - *
> - * If your board is busy doing other stuff, you might consider to use
> - * RXRE (data ready intrrupt) instead.
> - *
> - * The other option is to make these INTR masks run-time configurable, so
> - * that people can dynamically adapt them according to the current usage.
> - * -- Vladimir Gurevich
> - */
> -
> -/* (es) */
> -#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
> -#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
> -#elif defined(CONFIG_M68328)
> -#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
> -#else
> -#error Please, define the Rx interrupt events for your CPU
> -#endif
> -/* (/es) */
> -
> -/*
> - * This is our internal structure for each serial port's state.
> - */
> -struct m68k_serial {
> - struct tty_port tport;
> - char is_cons; /* Is this our console. */
> - int magic;
> - int baud_base;
> - int port;
> - int irq;
> - int type; /* UART type */
> - int custom_divisor;
> - int x_char; /* xon/xoff character */
> - int line;
> - unsigned char *xmit_buf;
> - int xmit_head;
> - int xmit_tail;
> - int xmit_cnt;
> -};
> -
> -#define SERIAL_MAGIC 0x5301
> -
> -/*
> - * Define the number of ports supported and their irqs.
> - */
> -#define NR_PORTS 1
> -
> -static struct m68k_serial m68k_soft[NR_PORTS];
> -
> -static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
> -
> -/* multiple ports are contiguous in memory */
> -m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
> -
> -struct tty_driver *serial_driver;
> -
> -static void change_speed(struct m68k_serial *info, struct tty_struct *tty);
> -
> -/*
> - * Setup for console. Argument comes from the boot command line.
> - */
> -
> -/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
> -#ifdef CONFIG_M68VZ328
> -#define CONSOLE_BAUD_RATE 19200
> -#define DEFAULT_CBAUD B19200
> -#endif
> -
> -
> -#ifndef CONSOLE_BAUD_RATE
> -#define CONSOLE_BAUD_RATE 9600
> -#define DEFAULT_CBAUD B9600
> -#endif
> -
> -
> -static int m68328_console_initted = 0;
> -static int m68328_console_baud = CONSOLE_BAUD_RATE;
> -static int m68328_console_cbaud = DEFAULT_CBAUD;
> -
> -
> -static inline int serial_paranoia_check(struct m68k_serial *info,
> - char *name, const char *routine)
> -{
> -#ifdef SERIAL_PARANOIA_CHECK
> - static const char *badmagic =
> - "Warning: bad magic number for serial struct %s in %s\n";
> - static const char *badinfo =
> - "Warning: null m68k_serial for %s in %s\n";
> -
> - if (!info) {
> - printk(badinfo, name, routine);
> - return 1;
> - }
> - if (info->magic != SERIAL_MAGIC) {
> - printk(badmagic, name, routine);
> - return 1;
> - }
> -#endif
> - return 0;
> -}
> -
> -/*
> - * This is used to figure out the divisor speeds and the timeouts
> - */
> -static int baud_table[] = {
> - 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
> - 9600, 19200, 38400, 57600, 115200, 0 };
> -
> -/* Utility routines */
> -static inline int get_baud(struct m68k_serial *ss)
> -{
> - unsigned long result = 115200;
> - unsigned short int baud = uart_addr[ss->line].ubaud;
> - if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
> - result >>= GET_FIELD(baud, UBAUD_DIVIDE);
> -
> - return result;
> -}
> -
> -/*
> - * ------------------------------------------------------------
> - * rs_stop() and rs_start()
> - *
> - * This routines are called before setting or resetting tty->stopped.
> - * They enable or disable transmitter interrupts, as necessary.
> - * ------------------------------------------------------------
> - */
> -static void rs_stop(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_stop"))
> - return;
> -
> - local_irq_save(flags);
> - uart->ustcnt &= ~USTCNT_TXEN;
> - local_irq_restore(flags);
> -}
> -
> -static int rs_put_char(char ch)
> -{
> - unsigned long flags;
> - int loops = 0;
> -
> - local_irq_save(flags);
> -
> - while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
> - loops++;
> - udelay(5);
> - }
> -
> - UTX_TXDATA = ch;
> - udelay(5);
> - local_irq_restore(flags);
> - return 1;
> -}
> -
> -static void rs_start(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_start"))
> - return;
> -
> - local_irq_save(flags);
> - if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
> -#ifdef USE_INTS
> - uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
> -#else
> - uart->ustcnt |= USTCNT_TXEN;
> -#endif
> - }
> - local_irq_restore(flags);
> -}
> -
> -static void receive_chars(struct m68k_serial *info, unsigned short rx)
> -{
> - m68328_uart *uart = &uart_addr[info->line];
> - unsigned char ch, flag;
> -
> - /*
> - * This do { } while() loop will get ALL chars out of Rx FIFO
> - */
> -#ifndef CONFIG_XCOPILOT_BUGS
> - do {
> -#endif
> - ch = GET_FIELD(rx, URX_RXDATA);
> -
> - if(info->is_cons) {
> - if(URX_BREAK & rx) { /* whee, break received */
> - return;
> -#ifdef CONFIG_MAGIC_SYSRQ
> - } else if (ch == 0x10) { /* ^P */
> - show_state();
> - show_free_areas(0);
> - show_buffers();
> -/* show_net_buffers(); */
> - return;
> - } else if (ch == 0x12) { /* ^R */
> - emergency_restart();
> - return;
> -#endif /* CONFIG_MAGIC_SYSRQ */
> - }
> - }
> -
> - flag = TTY_NORMAL;
> -
> - if (rx & URX_PARITY_ERROR)
> - flag = TTY_PARITY;
> - else if (rx & URX_OVRUN)
> - flag = TTY_OVERRUN;
> - else if (rx & URX_FRAME_ERROR)
> - flag = TTY_FRAME;
> -
> - tty_insert_flip_char(&info->tport, ch, flag);
> -#ifndef CONFIG_XCOPILOT_BUGS
> - } while((rx = uart->urx.w) & URX_DATA_READY);
> -#endif
> -
> - tty_schedule_flip(&info->tport);
> -}
> -
> -static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
> -{
> - m68328_uart *uart = &uart_addr[info->line];
> -
> - if (info->x_char) {
> - /* Send next char */
> - uart->utx.b.txdata = info->x_char;
> - info->x_char = 0;
> - goto clear_and_return;
> - }
> -
> - if ((info->xmit_cnt <= 0) || !tty || tty->stopped) {
> - /* That's peculiar... TX ints off */
> - uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
> - goto clear_and_return;
> - }
> -
> - /* 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--;
> -
> - if(info->xmit_cnt <= 0) {
> - /* All done for now... TX ints off */
> - uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
> - goto clear_and_return;
> - }
> -
> -clear_and_return:
> - /* Clear interrupt (should be auto)*/
> - return;
> -}
> -
> -/*
> - * This is the serial driver's generic interrupt routine
> - */
> -irqreturn_t rs_interrupt(int irq, void *dev_id)
> -{
> - struct m68k_serial *info = dev_id;
> - struct tty_struct *tty = tty_port_tty_get(&info->tport);
> - m68328_uart *uart;
> - unsigned short rx;
> - unsigned short tx;
> -
> - uart = &uart_addr[info->line];
> - rx = uart->urx.w;
> -
> -#ifdef USE_INTS
> - tx = uart->utx.w;
> -
> - if (rx & URX_DATA_READY)
> - receive_chars(info, rx);
> - if (tx & UTX_TX_AVAIL)
> - transmit_chars(info, tty);
> -#else
> - receive_chars(info, rx);
> -#endif
> - tty_kref_put(tty);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static int startup(struct m68k_serial *info, struct tty_struct *tty)
> -{
> - m68328_uart *uart = &uart_addr[info->line];
> - unsigned long flags;
> -
> - if (info->tport.flags & ASYNC_INITIALIZED)
> - return 0;
> -
> - if (!info->xmit_buf) {
> - info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
> - if (!info->xmit_buf)
> - return -ENOMEM;
> - }
> -
> - local_irq_save(flags);
> -
> - /*
> - * Clear the FIFO buffers and disable them
> - * (they will be reenabled in change_speed())
> - */
> -
> - uart->ustcnt = USTCNT_UEN;
> - uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
> - (void)uart->urx.w;
> -
> - /*
> - * Finally, enable sequencing and interrupts
> - */
> -#ifdef USE_INTS
> - uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
> - USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
> -#else
> - uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
> -#endif
> -
> - if (tty)
> - clear_bit(TTY_IO_ERROR, &tty->flags);
> - info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
> -
> - /*
> - * and set the speed of the serial port
> - */
> -
> - change_speed(info, tty);
> -
> - info->tport.flags |= ASYNC_INITIALIZED;
> - local_irq_restore(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 m68k_serial *info, struct tty_struct *tty)
> -{
> - m68328_uart *uart = &uart_addr[info->line];
> - unsigned long flags;
> -
> - uart->ustcnt = 0; /* All off! */
> - if (!(info->tport.flags & ASYNC_INITIALIZED))
> - return;
> -
> - local_irq_save(flags);
> -
> - if (info->xmit_buf) {
> - free_page((unsigned long) info->xmit_buf);
> - info->xmit_buf = 0;
> - }
> -
> - if (tty)
> - set_bit(TTY_IO_ERROR, &tty->flags);
> -
> - info->tport.flags &= ~ASYNC_INITIALIZED;
> - local_irq_restore(flags);
> -}
> -
> -struct {
> - int divisor, prescale;
> -}
> -#ifndef CONFIG_M68VZ328
> - hw_baud_table[18] = {
> - {0,0}, /* 0 */
> - {0,0}, /* 50 */
> - {0,0}, /* 75 */
> - {0,0}, /* 110 */
> - {0,0}, /* 134 */
> - {0,0}, /* 150 */
> - {0,0}, /* 200 */
> - {7,0x26}, /* 300 */
> - {6,0x26}, /* 600 */
> - {5,0x26}, /* 1200 */
> - {0,0}, /* 1800 */
> - {4,0x26}, /* 2400 */
> - {3,0x26}, /* 4800 */
> - {2,0x26}, /* 9600 */
> - {1,0x26}, /* 19200 */
> - {0,0x26}, /* 38400 */
> - {1,0x38}, /* 57600 */
> - {0,0x38}, /* 115200 */
> -};
> -#else
> - hw_baud_table[18] = {
> - {0,0}, /* 0 */
> - {0,0}, /* 50 */
> - {0,0}, /* 75 */
> - {0,0}, /* 110 */
> - {0,0}, /* 134 */
> - {0,0}, /* 150 */
> - {0,0}, /* 200 */
> - {0,0}, /* 300 */
> - {7,0x26}, /* 600 */
> - {6,0x26}, /* 1200 */
> - {0,0}, /* 1800 */
> - {5,0x26}, /* 2400 */
> - {4,0x26}, /* 4800 */
> - {3,0x26}, /* 9600 */
> - {2,0x26}, /* 19200 */
> - {1,0x26}, /* 38400 */
> - {0,0x26}, /* 57600 */
> - {1,0x38}, /* 115200 */
> -};
> -#endif
> -/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
> -
> -/*
> - * This routine is called to set the UART divisor registers to match
> - * the specified baud rate for a serial port.
> - */
> -static void change_speed(struct m68k_serial *info, struct tty_struct *tty)
> -{
> - m68328_uart *uart = &uart_addr[info->line];
> - unsigned short port;
> - unsigned short ustcnt;
> - unsigned cflag;
> - int i;
> -
> - cflag = tty->termios.c_cflag;
> - port = info->port;
> - if (!port)
> - return;
> -
> - ustcnt = uart->ustcnt;
> - 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 == NULL) return;
> - if (info->xmit_buf == NULL) 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 || !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) {
> - /* 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))
> - 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);
> - 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);
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index f38beb2..a261457 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -790,17 +790,6 @@ config SERIAL_CORE_CONSOLE
> config CONSOLE_POLL
> bool
>
> -config SERIAL_68328
> - bool "68328 serial support"
> - depends on M68328 || M68EZ328 || M68VZ328
> - help
> - This driver supports the built-in serial port of the Motorola 68328
> - (standard, EZ and VZ varieties).
> -
> -config SERIAL_68328_RTS_CTS
> - bool "Support RTS/CTS on 68328 serial port"
> - depends on SERIAL_68328
> -
> config SERIAL_MCF
> bool "Coldfire serial support"
> depends on COLDFIRE
> diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
> index 5ab4111..9d35387 100644
> --- a/drivers/tty/serial/Makefile
> +++ b/drivers/tty/serial/Makefile
> @@ -34,7 +34,6 @@ obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
> obj-$(CONFIG_SERIAL_MAX310X) += max310x.o
> obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
> obj-$(CONFIG_SERIAL_MUX) += mux.o
> -obj-$(CONFIG_SERIAL_68328) += 68328serial.o
> obj-$(CONFIG_SERIAL_MCF) += mcf.o
> obj-$(CONFIG_SERIAL_PMACZILOG) += pmac_zilog.o
> obj-$(CONFIG_SERIAL_HS_LPC32XX) += lpc32xx_hs.o
> --
> 1.9.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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