Quelle sunsu.c

Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
* su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
*
* Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
* Copyright (C) 1998-1999  Pete Zaitcev   (zaitcev@yahoo.com)
*
* This is mainly a variation of 8250.c, credits go to authors mentioned
* therein.  In fact this driver should be merged into the generic 8250.c
* infrastructure perhaps using a 8250_sparc.c module.
*
* Fixed to use tty_get_baud_rate().
*   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
*
* Converted to new 2.5.x UART layer.
*   David S. Miller (davem@davemloft.net), 2002-Jul-29
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/circ_buf.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/slab.h>
#ifdef CONFIG_SERIO
#include <linux/serio.h>
#endif
#include <linux/serial_reg.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include <linux/io.h>
#include <asm/irq.h>
#include <asm/setup.h>

#include <linux/serial_core.h>
#include <linux/sunserialcore.h>

/* We are on a NS PC87303 clocked with 24.0 MHz, which results
* in a UART clock of 1.8462 MHz.
*/
#define SU_BASE_BAUD (1846200 / 16)

enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };

struct serial_uart_config {
char *name;
int dfl_xmit_fifo_size;
int flags;
};

/*
* Here we define the default xmit fifo size used for each type of UART.
*/
static const struct serial_uart_config uart_config[] = {
{ "unknown", 1, 0 },
{ "8250", 1, 0 },
{ "16450", 1, 0 },
{ "16550", 1, 0 },
{ "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "Cirrus", 1,  0 },
{ "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
{ "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "Startech", 1, 0 },
{ "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO }
};

struct uart_sunsu_port {
struct uart_port port;
unsigned char  acr;
unsigned char  ier;
unsigned short  rev;
unsigned char  lcr;
unsigned int  lsr_break_flag;
unsigned int  cflag;

/* Probing information.  */
enum su_type  su_type;
unsigned int  type_probed; /* XXX Stupid */
unsigned long  reg_size;

#ifdef CONFIG_SERIO
struct serio  serio;
int   serio_open;
#endif
};

static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
{
offset <<= up->port.regshift;

switch (up->port.iotype) {
case UPIO_HUB6:
  outb(up->port.hub6 - 1 + offset, up->port.iobase);
  return inb(up->port.iobase + 1);

case UPIO_MEM:
  return readb(up->port.membase + offset);

default:
  return inb(up->port.iobase + offset);
}
}

static void serial_out(struct uart_sunsu_port *up, int offset, int value)
{
#ifndef CONFIG_SPARC64
/*
* MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
* connected with a gate then go to SlavIO. When IRQ4 goes tristated
* gate outputs a logical one. Since we use level triggered interrupts
* we have lockup and watchdog reset. We cannot mask IRQ because
* keyboard shares IRQ with us (Word has it as Bob Smelik's design).
* This problem is similar to what Alpha people suffer, see
* 8250_alpha.c.
*/
if (offset == UART_MCR)
  value |= UART_MCR_OUT2;
#endif
offset <<= up->port.regshift;

switch (up->port.iotype) {
case UPIO_HUB6:
  outb(up->port.hub6 - 1 + offset, up->port.iobase);
  outb(value, up->port.iobase + 1);
  break;

case UPIO_MEM:
  writeb(value, up->port.membase + offset);
  break;

default:
  outb(value, up->port.iobase + offset);
}
}

/*
* For the 16C950
*/
static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
{
serial_out(up, UART_SCR, offset);
serial_out(up, UART_ICR, value);
}

#ifdef CONFIG_SERIAL_8250_RSA
/*
* Attempts to turn on the RSA FIFO.  Returns zero on failure.
* We set the port uart clock rate if we succeed.
*/
static int __enable_rsa(struct uart_sunsu_port *up)
{
unsigned char mode;
int result;

mode = serial_in(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;

if (!result) {
  serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
  mode = serial_in(up, UART_RSA_MSR);
  result = mode & UART_RSA_MSR_FIFO;
}

if (result)
  up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;

return result;
}

static void enable_rsa(struct uart_sunsu_port *up)
{
if (up->port.type == PORT_RSA) {
  if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
   uart_port_lock_irq(&up->port);
   __enable_rsa(up);
   uart_port_unlock_irq(&up->port);
  }
  if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
   serial_out(up, UART_RSA_FRR, 0);
}
}

/*
* Attempts to turn off the RSA FIFO.  Returns zero on failure.
* It is unknown why interrupts were disabled in here.  However,
* the caller is expected to preserve this behaviour by grabbing
* the spinlock before calling this function.
*/
static void disable_rsa(struct uart_sunsu_port *up)
{
unsigned char mode;
int result;

if (up->port.type == PORT_RSA &&
     up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
  uart_port_lock_irq(&up->port);

  mode = serial_in(up, UART_RSA_MSR);
  result = !(mode & UART_RSA_MSR_FIFO);

  if (!result) {
   serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
   mode = serial_in(up, UART_RSA_MSR);
   result = !(mode & UART_RSA_MSR_FIFO);
  }

  if (result)
   up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
  uart_port_unlock_irq(&up->port);
}
}
#endif /* CONFIG_SERIAL_8250_RSA */

static inline void __stop_tx(struct uart_sunsu_port *p)
{
if (p->ier & UART_IER_THRI) {
  p->ier &= ~UART_IER_THRI;
  serial_out(p, UART_IER, p->ier);
}
}

static void sunsu_stop_tx(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);

__stop_tx(up);

/*
* We really want to stop the transmitter from sending.
*/
if (up->port.type == PORT_16C950) {
  up->acr |= UART_ACR_TXDIS;
  serial_icr_write(up, UART_ACR, up->acr);
}
}

static void sunsu_start_tx(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);

if (!(up->ier & UART_IER_THRI)) {
  up->ier |= UART_IER_THRI;
  serial_out(up, UART_IER, up->ier);
}

/*
* Re-enable the transmitter if we disabled it.
*/
if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
  up->acr &= ~UART_ACR_TXDIS;
  serial_icr_write(up, UART_ACR, up->acr);
}
}

static void sunsu_stop_rx(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);

up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
}

static void sunsu_enable_ms(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned long flags;

uart_port_lock_irqsave(&up->port, &flags);
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
uart_port_unlock_irqrestore(&up->port, flags);
}

static void
receive_chars(struct uart_sunsu_port *up, unsigned char *status)
{
struct tty_port *port = &up->port.state->port;
unsigned char ch, flag;
int max_count = 256;
int saw_console_brk = 0;

do {
  ch = serial_in(up, UART_RX);
  flag = TTY_NORMAL;
  up->port.icount.rx++;

  if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
           UART_LSR_FE | UART_LSR_OE))) {
   /*
* For statistics only
*/
   if (*status & UART_LSR_BI) {
    *status &= ~(UART_LSR_FE | UART_LSR_PE);
    up->port.icount.brk++;
    if (up->port.cons != NULL &&
        up->port.line == up->port.cons->index)
     saw_console_brk = 1;
    /*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
* or read_status_mask.
*/
    if (uart_handle_break(&up->port))
     goto ignore_char;
   } else if (*status & UART_LSR_PE)
    up->port.icount.parity++;
   else if (*status & UART_LSR_FE)
    up->port.icount.frame++;
   if (*status & UART_LSR_OE)
    up->port.icount.overrun++;

   /*
* Mask off conditions which should be ingored.
*/
   *status &= up->port.read_status_mask;

   if (up->port.cons != NULL &&
       up->port.line == up->port.cons->index) {
    /* Recover the break flag from console xmit */
    *status |= up->lsr_break_flag;
    up->lsr_break_flag = 0;
   }

   if (*status & UART_LSR_BI) {
    flag = TTY_BREAK;
   } else if (*status & UART_LSR_PE)
    flag = TTY_PARITY;
   else if (*status & UART_LSR_FE)
    flag = TTY_FRAME;
  }
  if (uart_handle_sysrq_char(&up->port, ch))
   goto ignore_char;
  if ((*status & up->port.ignore_status_mask) == 0)
   tty_insert_flip_char(port, ch, flag);
  if (*status & UART_LSR_OE)
   /*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character.
*/
    tty_insert_flip_char(port, 0, TTY_OVERRUN);
ignore_char:
  *status = serial_in(up, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));

if (saw_console_brk)
  sun_do_break();
}

static void transmit_chars(struct uart_sunsu_port *up)
{
struct tty_port *tport = &up->port.state->port;
unsigned char ch;
int count;

if (up->port.x_char) {
  serial_out(up, UART_TX, up->port.x_char);
  up->port.icount.tx++;
  up->port.x_char = 0;
  return;
}
if (uart_tx_stopped(&up->port)) {
  sunsu_stop_tx(&up->port);
  return;
}
if (kfifo_is_empty(&tport->xmit_fifo)) {
  __stop_tx(up);
  return;
}

count = up->port.fifosize;
do {
  if (!uart_fifo_get(&up->port, &ch))
   break;

  serial_out(up, UART_TX, ch);
} while (--count > 0);

if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
  uart_write_wakeup(&up->port);

if (kfifo_is_empty(&tport->xmit_fifo))
  __stop_tx(up);
}

static void check_modem_status(struct uart_sunsu_port *up)
{
int status;

status = serial_in(up, UART_MSR);

if ((status & UART_MSR_ANY_DELTA) == 0)
  return;

if (status & UART_MSR_TERI)
  up->port.icount.rng++;
if (status & UART_MSR_DDSR)
  up->port.icount.dsr++;
if (status & UART_MSR_DDCD)
  uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
if (status & UART_MSR_DCTS)
  uart_handle_cts_change(&up->port, status & UART_MSR_CTS);

wake_up_interruptible(&up->port.state->port.delta_msr_wait);
}

static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
{
struct uart_sunsu_port *up = dev_id;
unsigned long flags;
unsigned char status;

uart_port_lock_irqsave(&up->port, &flags);

do {
  status = serial_in(up, UART_LSR);
  if (status & UART_LSR_DR)
   receive_chars(up, &status);
  check_modem_status(up);
  if (status & UART_LSR_THRE)
   transmit_chars(up);

  tty_flip_buffer_push(&up->port.state->port);

} while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));

uart_port_unlock_irqrestore(&up->port, flags);

return IRQ_HANDLED;
}

/* Separate interrupt handling path for keyboard/mouse ports.  */

static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
     unsigned int iflag, unsigned int quot);

static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
{
unsigned int cur_cflag = up->cflag;
int quot, new_baud;

up->cflag &= ~CBAUD;
up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);

quot = up->port.uartclk / (16 * new_baud);

sunsu_change_speed(&up->port, up->cflag, 0, quot);
}

static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
{
do {
  unsigned char ch = serial_in(up, UART_RX);

  /* Stop-A is handled by drivers/char/keyboard.c now. */
  if (up->su_type == SU_PORT_KBD) {
#ifdef CONFIG_SERIO
   serio_interrupt(&up->serio, ch, 0);
#endif
  } else if (up->su_type == SU_PORT_MS) {
   int ret = suncore_mouse_baud_detection(ch, is_break);

   switch (ret) {
   case 2:
    sunsu_change_mouse_baud(up);
    fallthrough;
   case 1:
    break;

   case 0:
#ifdef CONFIG_SERIO
    serio_interrupt(&up->serio, ch, 0);
#endif
    break;
   }
  }
} while (serial_in(up, UART_LSR) & UART_LSR_DR);
}

static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
{
struct uart_sunsu_port *up = dev_id;

if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
  unsigned char status = serial_in(up, UART_LSR);

  if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
   receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
}

return IRQ_HANDLED;
}

static unsigned int sunsu_tx_empty(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned long flags;
unsigned int ret;

uart_port_lock_irqsave(&up->port, &flags);
ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
uart_port_unlock_irqrestore(&up->port, flags);

return ret;
}

static unsigned int sunsu_get_mctrl(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned char status;
unsigned int ret;

status = serial_in(up, UART_MSR);

ret = 0;
if (status & UART_MSR_DCD)
  ret |= TIOCM_CAR;
if (status & UART_MSR_RI)
  ret |= TIOCM_RNG;
if (status & UART_MSR_DSR)
  ret |= TIOCM_DSR;
if (status & UART_MSR_CTS)
  ret |= TIOCM_CTS;
return ret;
}

static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned char mcr = 0;

if (mctrl & TIOCM_RTS)
  mcr |= UART_MCR_RTS;
if (mctrl & TIOCM_DTR)
  mcr |= UART_MCR_DTR;
if (mctrl & TIOCM_OUT1)
  mcr |= UART_MCR_OUT1;
if (mctrl & TIOCM_OUT2)
  mcr |= UART_MCR_OUT2;
if (mctrl & TIOCM_LOOP)
  mcr |= UART_MCR_LOOP;

serial_out(up, UART_MCR, mcr);
}

static void sunsu_break_ctl(struct uart_port *port, int break_state)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned long flags;

uart_port_lock_irqsave(&up->port, &flags);
if (break_state == -1)
  up->lcr |= UART_LCR_SBC;
else
  up->lcr &= ~UART_LCR_SBC;
serial_out(up, UART_LCR, up->lcr);
uart_port_unlock_irqrestore(&up->port, flags);
}

static int sunsu_startup(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned long flags;
int retval;

if (up->port.type == PORT_16C950) {
  /* Wake up and initialize UART */
  up->acr = 0;
  serial_out(up, UART_LCR, 0xBF);
  serial_out(up, UART_EFR, UART_EFR_ECB);
  serial_out(up, UART_IER, 0);
  serial_out(up, UART_LCR, 0);
  serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
  serial_out(up, UART_LCR, 0xBF);
  serial_out(up, UART_EFR, UART_EFR_ECB);
  serial_out(up, UART_LCR, 0);
}

#ifdef CONFIG_SERIAL_8250_RSA
/*
* If this is an RSA port, see if we can kick it up to the
* higher speed clock.
*/
enable_rsa(up);
#endif

/*
* Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios())
*/
if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
  serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
  serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
    UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
  serial_out(up, UART_FCR, 0);
}

/*
* Clear the interrupt registers.
*/
(void) serial_in(up, UART_LSR);
(void) serial_in(up, UART_RX);
(void) serial_in(up, UART_IIR);
(void) serial_in(up, UART_MSR);

/*
* At this point, there's no way the LSR could still be 0xff;
* if it is, then bail out, because there's likely no UART
* here.
*/
if (!(up->port.flags & UPF_BUGGY_UART) &&
     (serial_in(up, UART_LSR) == 0xff)) {
  printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
  return -ENODEV;
}

if (up->su_type != SU_PORT_PORT) {
  retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
         IRQF_SHARED, su_typev[up->su_type], up);
} else {
  retval = request_irq(up->port.irq, sunsu_serial_interrupt,
         IRQF_SHARED, su_typev[up->su_type], up);
}
if (retval) {
  printk("su: Cannot register IRQ %d\n", up->port.irq);
  return retval;
}

/*
* Now, initialize the UART
*/
serial_out(up, UART_LCR, UART_LCR_WLEN8);

uart_port_lock_irqsave(&up->port, &flags);

up->port.mctrl |= TIOCM_OUT2;

sunsu_set_mctrl(&up->port, up->port.mctrl);
uart_port_unlock_irqrestore(&up->port, flags);

/*
* Finally, enable interrupts.  Note: Modem status interrupts
* are set via set_termios(), which will be occurring imminently
* anyway, so we don't enable them here.
*/
up->ier = UART_IER_RLSI | UART_IER_RDI;
serial_out(up, UART_IER, up->ier);

if (up->port.flags & UPF_FOURPORT) {
  unsigned int icp;
  /*
* Enable interrupts on the AST Fourport board
*/
  icp = (up->port.iobase & 0xfe0) | 0x01f;
  outb_p(0x80, icp);
  (void) inb_p(icp);
}

/*
* And clear the interrupt registers again for luck.
*/
(void) serial_in(up, UART_LSR);
(void) serial_in(up, UART_RX);
(void) serial_in(up, UART_IIR);
(void) serial_in(up, UART_MSR);

return 0;
}

static void sunsu_shutdown(struct uart_port *port)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned long flags;

/*
* Disable interrupts from this port
*/
up->ier = 0;
serial_out(up, UART_IER, 0);

uart_port_lock_irqsave(&up->port, &flags);
if (up->port.flags & UPF_FOURPORT) {
  /* reset interrupts on the AST Fourport board */
  inb((up->port.iobase & 0xfe0) | 0x1f);
  up->port.mctrl |= TIOCM_OUT1;
} else
  up->port.mctrl &= ~TIOCM_OUT2;

sunsu_set_mctrl(&up->port, up->port.mctrl);
uart_port_unlock_irqrestore(&up->port, flags);

/*
* Disable break condition and FIFOs
*/
serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
      UART_FCR_CLEAR_RCVR |
      UART_FCR_CLEAR_XMIT);
serial_out(up, UART_FCR, 0);

#ifdef CONFIG_SERIAL_8250_RSA
/*
* Reset the RSA board back to 115kbps compat mode.
*/
disable_rsa(up);
#endif

/*
* Read data port to reset things.
*/
(void) serial_in(up, UART_RX);

free_irq(up->port.irq, up);
}

static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
     unsigned int iflag, unsigned int quot)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);
unsigned char cval, fcr = 0;
unsigned long flags;

switch (cflag & CSIZE) {
case CS5:
  cval = 0x00;
  break;
case CS6:
  cval = 0x01;
  break;
case CS7:
  cval = 0x02;
  break;
default:
case CS8:
  cval = 0x03;
  break;
}

if (cflag & CSTOPB)
  cval |= 0x04;
if (cflag & PARENB)
  cval |= UART_LCR_PARITY;
if (!(cflag & PARODD))
  cval |= UART_LCR_EPAR;
if (cflag & CMSPAR)
  cval |= UART_LCR_SPAR;

/*
* Work around a bug in the Oxford Semiconductor 952 rev B
* chip which causes it to seriously miscalculate baud rates
* when DLL is 0.
*/
if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
     up->rev == 0x5201)
  quot ++;

if (uart_config[up->port.type].flags & UART_USE_FIFO) {
  if ((up->port.uartclk / quot) < (2400 * 16))
   fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
#ifdef CONFIG_SERIAL_8250_RSA
  else if (up->port.type == PORT_RSA)
   fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
  else
   fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
}
if (up->port.type == PORT_16750)
  fcr |= UART_FCR7_64BYTE;

/*
* Ok, we're now changing the port state.  Do it with
* interrupts disabled.
*/
uart_port_lock_irqsave(&up->port, &flags);

/*
* Update the per-port timeout.
*/
uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));

up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (iflag & INPCK)
  up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (iflag & (IGNBRK | BRKINT | PARMRK))
  up->port.read_status_mask |= UART_LSR_BI;

/*
* Characteres to ignore
*/
up->port.ignore_status_mask = 0;
if (iflag & IGNPAR)
  up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (iflag & IGNBRK) {
  up->port.ignore_status_mask |= UART_LSR_BI;
  /*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
  if (iflag & IGNPAR)
   up->port.ignore_status_mask |= UART_LSR_OE;
}

/*
* ignore all characters if CREAD is not set
*/
if ((cflag & CREAD) == 0)
  up->port.ignore_status_mask |= UART_LSR_DR;

/*
* CTS flow control flag and modem status interrupts
*/
up->ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(&up->port, cflag))
  up->ier |= UART_IER_MSI;

serial_out(up, UART_IER, up->ier);

if (uart_config[up->port.type].flags & UART_STARTECH) {
  serial_out(up, UART_LCR, 0xBF);
  serial_out(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
}
serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
serial_out(up, UART_DLL, quot & 0xff);  /* LS of divisor */
serial_out(up, UART_DLM, quot >> 8);  /* MS of divisor */
if (up->port.type == PORT_16750)
  serial_out(up, UART_FCR, fcr);  /* set fcr */
serial_out(up, UART_LCR, cval);  /* reset DLAB */
up->lcr = cval;     /* Save LCR */
if (up->port.type != PORT_16750) {
  if (fcr & UART_FCR_ENABLE_FIFO) {
   /* emulated UARTs (Lucent Venus 167x) need two steps */
   serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
  }
  serial_out(up, UART_FCR, fcr);  /* set fcr */
}

up->cflag = cflag;

uart_port_unlock_irqrestore(&up->port, flags);
}

static void
sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
    const struct ktermios *old)
{
unsigned int baud, quot;

/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);

sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
}

static void sunsu_release_port(struct uart_port *port)
{
}

static int sunsu_request_port(struct uart_port *port)
{
return 0;
}

static void sunsu_config_port(struct uart_port *port, int flags)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);

if (flags & UART_CONFIG_TYPE) {
  /*
* We are supposed to call autoconfig here, but this requires
* splitting all the OBP probing crap from the UART probing.
* We'll do it when we kill sunsu.c altogether.
*/
  port->type = up->type_probed; /* XXX */
}
}

static int
sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return -EINVAL;
}

static const char *
sunsu_type(struct uart_port *port)
{
int type = port->type;

if (type >= ARRAY_SIZE(uart_config))
  type = 0;
return uart_config[type].name;
}

static const struct uart_ops sunsu_pops = {
.tx_empty = sunsu_tx_empty,
.set_mctrl = sunsu_set_mctrl,
.get_mctrl = sunsu_get_mctrl,
.stop_tx = sunsu_stop_tx,
.start_tx = sunsu_start_tx,
.stop_rx = sunsu_stop_rx,
.enable_ms = sunsu_enable_ms,
.break_ctl = sunsu_break_ctl,
.startup = sunsu_startup,
.shutdown = sunsu_shutdown,
.set_termios = sunsu_set_termios,
.type  = sunsu_type,
.release_port = sunsu_release_port,
.request_port = sunsu_request_port,
.config_port = sunsu_config_port,
.verify_port = sunsu_verify_port,
};

#define UART_NR 4

static struct uart_sunsu_port sunsu_ports[UART_NR];
static int nr_inst; /* Number of already registered ports */

#ifdef CONFIG_SERIO

static DEFINE_SPINLOCK(sunsu_serio_lock);

static int sunsu_serio_write(struct serio *serio, unsigned char ch)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;
int lsr;

spin_lock_irqsave(&sunsu_serio_lock, flags);

do {
  lsr = serial_in(up, UART_LSR);
} while (!(lsr & UART_LSR_THRE));

/* Send the character out. */
serial_out(up, UART_TX, ch);

spin_unlock_irqrestore(&sunsu_serio_lock, flags);

return 0;
}

static int sunsu_serio_open(struct serio *serio)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;
int ret;

spin_lock_irqsave(&sunsu_serio_lock, flags);
if (!up->serio_open) {
  up->serio_open = 1;
  ret = 0;
} else
  ret = -EBUSY;
spin_unlock_irqrestore(&sunsu_serio_lock, flags);

return ret;
}

static void sunsu_serio_close(struct serio *serio)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;

spin_lock_irqsave(&sunsu_serio_lock, flags);
up->serio_open = 0;
spin_unlock_irqrestore(&sunsu_serio_lock, flags);
}

#endif /* CONFIG_SERIO */

static void sunsu_autoconfig(struct uart_sunsu_port *up)
{
unsigned char status1, status2, scratch, scratch2, scratch3;
unsigned char save_lcr, save_mcr;
unsigned long flags;

if (up->su_type == SU_PORT_NONE)
  return;

up->type_probed = PORT_UNKNOWN;
up->port.iotype = UPIO_MEM;

uart_port_lock_irqsave(&up->port, &flags);

if (!(up->port.flags & UPF_BUGGY_UART)) {
  /*
* Do a simple existence test first; if we fail this, there's
* no point trying anything else.
*
* 0x80 is used as a nonsense port to prevent against false
* positives due to ISA bus float.  The assumption is that
* 0x80 is a non-existent port; which should be safe since
* include/asm/io.h also makes this assumption.
*/
  scratch = serial_in(up, UART_IER);
  serial_out(up, UART_IER, 0);
#ifdef __i386__
  outb(0xff, 0x080);
#endif
  scratch2 = serial_in(up, UART_IER);
  serial_out(up, UART_IER, 0x0f);
#ifdef __i386__
  outb(0, 0x080);
#endif
  scratch3 = serial_in(up, UART_IER);
  serial_out(up, UART_IER, scratch);
  if (scratch2 != 0 || scratch3 != 0x0F)
   goto out; /* We failed; there's nothing here */
}

save_mcr = serial_in(up, UART_MCR);
save_lcr = serial_in(up, UART_LCR);

/*
* Check to see if a UART is really there.  Certain broken
* internal modems based on the Rockwell chipset fail this
* test, because they apparently don't implement the loopback
* test mode.  So this test is skipped on the COM 1 through
* COM 4 ports.  This *should* be safe, since no board
* manufacturer would be stupid enough to design a board
* that conflicts with COM 1-4 --- we hope!
*/
if (!(up->port.flags & UPF_SKIP_TEST)) {
  serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A);
  status1 = serial_in(up, UART_MSR) & 0xF0;
  serial_out(up, UART_MCR, save_mcr);
  if (status1 != 0x90)
   goto out; /* We failed loopback test */
}
serial_out(up, UART_LCR, 0xBF); /* set up for StarTech test */
serial_out(up, UART_EFR, 0);  /* EFR is the same as FCR */
serial_out(up, UART_LCR, 0);
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
scratch = serial_in(up, UART_IIR) >> 6;
switch (scratch) {
  case 0:
   up->port.type = PORT_16450;
   break;
  case 1:
   up->port.type = PORT_UNKNOWN;
   break;
  case 2:
   up->port.type = PORT_16550;
   break;
  case 3:
   up->port.type = PORT_16550A;
   break;
}
if (up->port.type == PORT_16550A) {
  /* Check for Startech UART's */
  serial_out(up, UART_LCR, UART_LCR_DLAB);
  if (serial_in(up, UART_EFR) == 0) {
   up->port.type = PORT_16650;
  } else {
   serial_out(up, UART_LCR, 0xBF);
   if (serial_in(up, UART_EFR) == 0)
    up->port.type = PORT_16650V2;
  }
}
if (up->port.type == PORT_16550A) {
  /* Check for TI 16750 */
  serial_out(up, UART_LCR, save_lcr | UART_LCR_DLAB);
  serial_out(up, UART_FCR,
       UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
  scratch = serial_in(up, UART_IIR) >> 5;
  if (scratch == 7) {
   /*
* If this is a 16750, and not a cheap UART
* clone, then it should only go into 64 byte
* mode if the UART_FCR7_64BYTE bit was set
* while UART_LCR_DLAB was latched.
*/
   serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
   serial_out(up, UART_LCR, 0);
   serial_out(up, UART_FCR,
        UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
   scratch = serial_in(up, UART_IIR) >> 5;
   if (scratch == 6)
    up->port.type = PORT_16750;
  }
  serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
}
serial_out(up, UART_LCR, save_lcr);
if (up->port.type == PORT_16450) {
  scratch = serial_in(up, UART_SCR);
  serial_out(up, UART_SCR, 0xa5);
  status1 = serial_in(up, UART_SCR);
  serial_out(up, UART_SCR, 0x5a);
  status2 = serial_in(up, UART_SCR);
  serial_out(up, UART_SCR, scratch);

  if ((status1 != 0xa5) || (status2 != 0x5a))
   up->port.type = PORT_8250;
}

up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;

if (up->port.type == PORT_UNKNOWN)
  goto out;
up->type_probed = up->port.type; /* XXX */

/*
* Reset the UART.
*/
#ifdef CONFIG_SERIAL_8250_RSA
if (up->port.type == PORT_RSA)
  serial_out(up, UART_RSA_FRR, 0);
#endif
serial_out(up, UART_MCR, save_mcr);
serial_out(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
         UART_FCR_CLEAR_RCVR |
         UART_FCR_CLEAR_XMIT));
serial_out(up, UART_FCR, 0);
(void)serial_in(up, UART_RX);
serial_out(up, UART_IER, 0);

out:
uart_port_unlock_irqrestore(&up->port, flags);
}

static struct uart_driver sunsu_reg = {
.owner   = THIS_MODULE,
.driver_name  = "sunsu",
.dev_name  = "ttyS",
.major   = TTY_MAJOR,
};

static int sunsu_kbd_ms_init(struct uart_sunsu_port *up)
{
int quot, baud;
#ifdef CONFIG_SERIO
struct serio *serio;
#endif

if (up->su_type == SU_PORT_KBD) {
  up->cflag = B1200 | CS8 | CLOCAL | CREAD;
  baud = 1200;
} else {
  up->cflag = B4800 | CS8 | CLOCAL | CREAD;
  baud = 4800;
}
quot = up->port.uartclk / (16 * baud);

sunsu_autoconfig(up);
if (up->port.type == PORT_UNKNOWN)
  return -ENODEV;

printk("%pOF: %s port at %llx, irq %u\n",
        up->port.dev->of_node,
        (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
        (unsigned long long) up->port.mapbase,
        up->port.irq);

#ifdef CONFIG_SERIO
serio = &up->serio;
serio->port_data = up;

serio->id.type = SERIO_RS232;
if (up->su_type == SU_PORT_KBD) {
  serio->id.proto = SERIO_SUNKBD;
  strscpy(serio->name, "sukbd", sizeof(serio->name));
} else {
  serio->id.proto = SERIO_SUN;
  serio->id.extra = 1;
  strscpy(serio->name, "sums", sizeof(serio->name));
}
strscpy(serio->phys,
  (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
  sizeof(serio->phys));

serio->write = sunsu_serio_write;
serio->open = sunsu_serio_open;
serio->close = sunsu_serio_close;
serio->dev.parent = up->port.dev;

serio_register_port(serio);
#endif

sunsu_change_speed(&up->port, up->cflag, 0, quot);

sunsu_startup(&up->port);
return 0;
}

/*
* ------------------------------------------------------------
* Serial console driver
* ------------------------------------------------------------
*/

#ifdef CONFIG_SERIAL_SUNSU_CONSOLE

/*
* Wait for transmitter & holding register to empty
*/
static void wait_for_xmitr(struct uart_sunsu_port *up)
{
unsigned int status, tmout = 10000;

/* Wait up to 10ms for the character(s) to be sent. */
do {
  status = serial_in(up, UART_LSR);

  if (status & UART_LSR_BI)
   up->lsr_break_flag = UART_LSR_BI;

  if (--tmout == 0)
   break;
  udelay(1);
} while (!uart_lsr_tx_empty(status));

/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
  tmout = 1000000;
  while (--tmout &&
         ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
   udelay(1);
}
}

static void sunsu_console_putchar(struct uart_port *port, unsigned char ch)
{
struct uart_sunsu_port *up =
  container_of(port, struct uart_sunsu_port, port);

wait_for_xmitr(up);
serial_out(up, UART_TX, ch);
}

/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*/
static void sunsu_console_write(struct console *co, const char *s,
    unsigned int count)
{
struct uart_sunsu_port *up = &sunsu_ports[co->index];
unsigned long flags;
unsigned int ier;
int locked = 1;

if (up->port.sysrq || oops_in_progress)
  locked = uart_port_trylock_irqsave(&up->port, &flags);
else
  uart_port_lock_irqsave(&up->port, &flags);

/*
* First save the UER then disable the interrupts
*/
ier = serial_in(up, UART_IER);
serial_out(up, UART_IER, 0);

uart_console_write(&up->port, s, count, sunsu_console_putchar);

/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
serial_out(up, UART_IER, ier);

if (locked)
  uart_port_unlock_irqrestore(&up->port, flags);
}

/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first su_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int __init sunsu_console_setup(struct console *co, char *options)
{
static struct ktermios dummy;
struct ktermios termios;
struct uart_port *port;

printk("Console: ttyS%d (SU)\n",
        (sunsu_reg.minor - 64) + co->index);

if (co->index > nr_inst)
  return -ENODEV;
port = &sunsu_ports[co->index].port;

/*
* Temporary fix.
*/
spin_lock_init(&port->lock);

/* Get firmware console settings.  */
sunserial_console_termios(co, port->dev->of_node);

memset(&termios, 0, sizeof(struct ktermios));
termios.c_cflag = co->cflag;
port->mctrl |= TIOCM_DTR;
port->ops->set_termios(port, &termios, &dummy);

return 0;
}

static struct console sunsu_console = {
.name = "ttyS",
.write = sunsu_console_write,
.device = uart_console_device,
.setup = sunsu_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sunsu_reg,
};

/*
* Register console.
*/

static inline struct console *SUNSU_CONSOLE(void)
{
return &sunsu_console;
}
#else
#define SUNSU_CONSOLE()   (NULL)
#define sunsu_serial_console_init() do { } while (0)
#endif

static enum su_type su_get_type(struct device_node *dp)
{
struct device_node *ap __free(device_node) =
       of_find_node_by_path("/aliases");

if (ap) {
  const char *keyb = of_get_property(ap, "keyboard", NULL);
  const char *ms = of_get_property(ap, "mouse", NULL);

  if (keyb) {
   struct device_node *match __free(device_node) =
         of_find_node_by_path(keyb);

   if (dp == match)
    return SU_PORT_KBD;
  }
  if (ms) {
   struct device_node *match __free(device_node) =
         of_find_node_by_path(ms);

   if (dp == match)
    return SU_PORT_MS;
  }
}
return SU_PORT_PORT;
}

static int su_probe(struct platform_device *op)
{
struct device_node *dp = op->dev.of_node;
struct uart_sunsu_port *up;
struct resource *rp;
enum su_type type;
bool ignore_line;
int err;

type = su_get_type(dp);
if (type == SU_PORT_PORT) {
  if (nr_inst >= UART_NR)
   return -EINVAL;
  up = &sunsu_ports[nr_inst];
} else {
  up = kzalloc(sizeof(*up), GFP_KERNEL);
  if (!up)
   return -ENOMEM;
}

up->port.line = nr_inst;

spin_lock_init(&up->port.lock);

up->su_type = type;

rp = &op->resource[0];
up->port.mapbase = rp->start;
up->reg_size = resource_size(rp);
up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
if (!up->port.membase) {
  if (type != SU_PORT_PORT)
   kfree(up);
  return -ENOMEM;
}

up->port.irq = op->archdata.irqs[0];

up->port.dev = &op->dev;

up->port.type = PORT_UNKNOWN;
up->port.uartclk = (SU_BASE_BAUD * 16);
up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE);

err = 0;
if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
  err = sunsu_kbd_ms_init(up);
  if (err) {
   of_iounmap(&op->resource[0],
       up->port.membase, up->reg_size);
   kfree(up);
   return err;
  }
  platform_set_drvdata(op, up);

  nr_inst++;

  return 0;
}

up->port.flags |= UPF_BOOT_AUTOCONF;

sunsu_autoconfig(up);

err = -ENODEV;
if (up->port.type == PORT_UNKNOWN)
  goto out_unmap;

up->port.ops = &sunsu_pops;

ignore_line = false;
if (of_node_name_eq(dp, "rsc-console") ||
     of_node_name_eq(dp, "lom-console"))
  ignore_line = true;

sunserial_console_match(SUNSU_CONSOLE(), dp,
    &sunsu_reg, up->port.line,
    ignore_line);
err = uart_add_one_port(&sunsu_reg, &up->port);
if (err)
  goto out_unmap;

platform_set_drvdata(op, up);

nr_inst++;

return 0;

out_unmap:
of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
kfree(up);
return err;
}

static void su_remove(struct platform_device *op)
{
struct uart_sunsu_port *up = platform_get_drvdata(op);
bool kbdms = false;

if (up->su_type == SU_PORT_MS ||
     up->su_type == SU_PORT_KBD)
  kbdms = true;

if (kbdms) {
#ifdef CONFIG_SERIO
  serio_unregister_port(&up->serio);
#endif
} else if (up->port.type != PORT_UNKNOWN)
  uart_remove_one_port(&sunsu_reg, &up->port);

if (up->port.membase)
  of_iounmap(&op->resource[0], up->port.membase, up->reg_size);

if (kbdms)
  kfree(up);
}

static const struct of_device_id su_match[] = {
{
  .name = "su",
},
{
  .name = "su_pnp",
},
{
  .name = "serial",
  .compatible = "su",
},
{
  .type = "serial",
  .compatible = "su",
},
{},
};
MODULE_DEVICE_TABLE(of, su_match);

static struct platform_driver su_driver = {
.driver = {
  .name = "su",
  .of_match_table = su_match,
},
.probe  = su_probe,
.remove  = su_remove,
};

static int __init sunsu_init(void)
{
struct device_node *dp;
int err;
int num_uart = 0;

for_each_node_by_name(dp, "su") {
  if (su_get_type(dp) == SU_PORT_PORT)
   num_uart++;
}
for_each_node_by_name(dp, "su_pnp") {
  if (su_get_type(dp) == SU_PORT_PORT)
   num_uart++;
}
for_each_node_by_name(dp, "serial") {
  if (of_device_is_compatible(dp, "su")) {
   if (su_get_type(dp) == SU_PORT_PORT)
    num_uart++;
  }
}
for_each_node_by_type(dp, "serial") {
  if (of_device_is_compatible(dp, "su")) {
   if (su_get_type(dp) == SU_PORT_PORT)
    num_uart++;
  }
}

if (num_uart) {
  err = sunserial_register_minors(&sunsu_reg, num_uart);
  if (err)
   return err;
}

err = platform_driver_register(&su_driver);
if (err && num_uart)
  sunserial_unregister_minors(&sunsu_reg, num_uart);

return err;
}

static void __exit sunsu_exit(void)
{
platform_driver_unregister(&su_driver);
if (sunsu_reg.nr)
  sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
}

module_init(sunsu_init);
module_exit(sunsu_exit);

MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
MODULE_DESCRIPTION("Sun SU serial port driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");

Messung V0.5 in Prozent

¤ Dauer der Verarbeitung: 0.16 Sekunden (vorverarbeitet am 2026-04-29) ¤

Wurzel

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Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

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Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.