Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/char/esp.c b/drivers/char/esp.c
new file mode 100644
index 0000000..9f53d2fc
--- /dev/null
+++ b/drivers/char/esp.c
@@ -0,0 +1,2630 @@
+/*
+ * esp.c - driver for Hayes ESP serial cards
+ *
+ * --- Notices from serial.c, upon which this driver is based ---
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
+ * much more extensible to support other serial cards based on the
+ * 16450/16550A UART's. Added support for the AST FourPort and the
+ * Accent Async board.
+ *
+ * set_serial_info fixed to set the flags, custom divisor, and uart
+ * type fields. Fix suggested by Michael K. Johnson 12/12/92.
+ *
+ * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
+ *
+ * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
+ *
+ * rs_set_termios fixed to look also for changes of the input
+ * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
+ * Bernd Anh�pl 05/17/96.
+ *
+ * --- End of notices from serial.c ---
+ *
+ * Support for the ESP serial card by Andrew J. Robinson
+ * <arobinso@nyx.net> (Card detection routine taken from a patch
+ * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
+ * by Chris Faylor.
+ *
+ * Most recent changes: (Andrew J. Robinson)
+ * Support for PIO mode. This allows the driver to work properly with
+ * multiport cards.
+ *
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
+ * several cleanups, use module_init/module_exit, etc
+ *
+ * This module exports the following rs232 io functions:
+ *
+ * int espserial_init(void);
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/serial_reg.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include <asm/dma.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+
+#include <linux/hayesesp.h>
+
+#define NR_PORTS 64 /* maximum number of ports */
+#define NR_PRIMARY 8 /* maximum number of primary ports */
+#define REGION_SIZE 8 /* size of io region to request */
+
+/* The following variables can be set by giving module options */
+static int irq[NR_PRIMARY]; /* IRQ for each base port */
+static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
+static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
+static unsigned int rx_trigger = ESP_RX_TRIGGER;
+static unsigned int tx_trigger = ESP_TX_TRIGGER;
+static unsigned int flow_off = ESP_FLOW_OFF;
+static unsigned int flow_on = ESP_FLOW_ON;
+static unsigned int rx_timeout = ESP_RX_TMOUT;
+static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
+
+MODULE_LICENSE("GPL");
+
+module_param_array(irq, int, NULL, 0);
+module_param_array(divisor, uint, NULL, 0);
+module_param(dma, uint, 0);
+module_param(rx_trigger, uint, 0);
+module_param(tx_trigger, uint, 0);
+module_param(flow_off, uint, 0);
+module_param(flow_on, uint, 0);
+module_param(rx_timeout, uint, 0);
+module_param(pio_threshold, uint, 0);
+
+/* END */
+
+static char *dma_buffer;
+static int dma_bytes;
+static struct esp_pio_buffer *free_pio_buf;
+
+#define DMA_BUFFER_SZ 1024
+
+#define WAKEUP_CHARS 1024
+
+static char serial_name[] __initdata = "ESP serial driver";
+static char serial_version[] __initdata = "2.2";
+
+static struct tty_driver *esp_driver;
+
+/* serial subtype definitions */
+#define SERIAL_TYPE_NORMAL 1
+
+/*
+ * Serial driver configuration section. Here are the various options:
+ *
+ * SERIAL_PARANOIA_CHECK
+ * Check the magic number for the esp_structure where
+ * ever possible.
+ */
+
+#undef SERIAL_PARANOIA_CHECK
+#define SERIAL_DO_RESTART
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
+ tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+static struct esp_struct *ports;
+
+static void change_speed(struct esp_struct *info);
+static void rs_wait_until_sent(struct tty_struct *, int);
+
+/*
+ * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
+ * times the normal 1.8432 Mhz clock of most serial boards).
+ */
+#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
+
+/* Standard COM flags (except for COM4, because of the 8514 problem) */
+#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write. We need to
+ * lock it in case the memcpy_fromfs blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char *tmp_buf;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+static inline int serial_paranoia_check(struct esp_struct *info,
+ char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char badmagic[] = KERN_WARNING
+ "Warning: bad magic number for serial struct (%s) in %s\n";
+ static const char badinfo[] = KERN_WARNING
+ "Warning: null esp_struct for (%s) in %s\n";
+
+ if (!info) {
+ printk(badinfo, name, routine);
+ return 1;
+ }
+ if (info->magic != ESP_MAGIC) {
+ printk(badmagic, name, routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+static inline unsigned int serial_in(struct esp_struct *info, int offset)
+{
+ return inb(info->port + offset);
+}
+
+static inline void serial_out(struct esp_struct *info, int offset,
+ unsigned char value)
+{
+ outb(value, info->port+offset);
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_stop"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+ if (info->IER & UART_IER_THRI) {
+ info->IER &= ~UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_start"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+ if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static inline void rs_sched_event(struct esp_struct *info,
+ int event)
+{
+ info->event |= 1 << event;
+ schedule_work(&info->tqueue);
+}
+
+static DEFINE_SPINLOCK(pio_lock);
+
+static inline struct esp_pio_buffer *get_pio_buffer(void)
+{
+ struct esp_pio_buffer *buf;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pio_lock, flags);
+ if (free_pio_buf) {
+ buf = free_pio_buf;
+ free_pio_buf = buf->next;
+ } else {
+ buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
+ }
+ spin_unlock_irqrestore(&pio_lock, flags);
+ return buf;
+}
+
+static inline void release_pio_buffer(struct esp_pio_buffer *buf)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&pio_lock, flags);
+ buf->next = free_pio_buf;
+ free_pio_buf = buf;
+ spin_unlock_irqrestore(&pio_lock, flags);
+}
+
+static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
+{
+ struct tty_struct *tty = info->tty;
+ int i;
+ struct esp_pio_buffer *pio_buf;
+ struct esp_pio_buffer *err_buf;
+ unsigned char status_mask;
+
+ pio_buf = get_pio_buffer();
+
+ if (!pio_buf)
+ return;
+
+ err_buf = get_pio_buffer();
+
+ if (!err_buf) {
+ release_pio_buffer(pio_buf);
+ return;
+ }
+
+ status_mask = (info->read_status_mask >> 2) & 0x07;
+
+ for (i = 0; i < num_bytes - 1; i += 2) {
+ *((unsigned short *)(pio_buf->data + i)) =
+ inw(info->port + UART_ESI_RX);
+ err_buf->data[i] = serial_in(info, UART_ESI_RWS);
+ err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
+ err_buf->data[i] &= status_mask;
+ }
+
+ if (num_bytes & 0x0001) {
+ pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
+ err_buf->data[num_bytes - 1] =
+ (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
+ }
+
+ /* make sure everything is still ok since interrupts were enabled */
+ tty = info->tty;
+
+ if (!tty) {
+ release_pio_buffer(pio_buf);
+ release_pio_buffer(err_buf);
+ info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
+ return;
+ }
+
+ status_mask = (info->ignore_status_mask >> 2) & 0x07;
+
+ for (i = 0; i < num_bytes; i++) {
+ if (!(err_buf->data[i] & status_mask)) {
+ *(tty->flip.char_buf_ptr++) = pio_buf->data[i];
+
+ if (err_buf->data[i] & 0x04) {
+ *(tty->flip.flag_buf_ptr++) = TTY_BREAK;
+
+ if (info->flags & ASYNC_SAK)
+ do_SAK(tty);
+ }
+ else if (err_buf->data[i] & 0x02)
+ *(tty->flip.flag_buf_ptr++) = TTY_FRAME;
+ else if (err_buf->data[i] & 0x01)
+ *(tty->flip.flag_buf_ptr++) = TTY_PARITY;
+ else
+ *(tty->flip.flag_buf_ptr++) = 0;
+
+ tty->flip.count++;
+ }
+ }
+
+ schedule_delayed_work(&tty->flip.work, 1);
+
+ info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
+ release_pio_buffer(pio_buf);
+ release_pio_buffer(err_buf);
+}
+
+static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
+{
+ unsigned long flags;
+ info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
+ dma_bytes = num_bytes;
+ info->stat_flags |= ESP_STAT_DMA_RX;
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma, DMA_MODE_READ);
+ set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+ set_dma_count(dma, dma_bytes);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
+}
+
+static inline void receive_chars_dma_done(struct esp_struct *info,
+ int status)
+{
+ struct tty_struct *tty = info->tty;
+ int num_bytes;
+ unsigned long flags;
+
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+
+ info->stat_flags &= ~ESP_STAT_DMA_RX;
+ num_bytes = dma_bytes - get_dma_residue(dma);
+ release_dma_lock(flags);
+
+ info->icount.rx += num_bytes;
+
+ memcpy(tty->flip.char_buf_ptr, dma_buffer, num_bytes);
+ tty->flip.char_buf_ptr += num_bytes;
+ tty->flip.count += num_bytes;
+ memset(tty->flip.flag_buf_ptr, 0, num_bytes);
+ tty->flip.flag_buf_ptr += num_bytes;
+
+ if (num_bytes > 0) {
+ tty->flip.flag_buf_ptr--;
+
+ status &= (0x1c & info->read_status_mask);
+
+ if (status & info->ignore_status_mask) {
+ tty->flip.count--;
+ tty->flip.char_buf_ptr--;
+ tty->flip.flag_buf_ptr--;
+ } else if (status & 0x10) {
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ (info->icount.brk)++;
+ if (info->flags & ASYNC_SAK)
+ do_SAK(tty);
+ } else if (status & 0x08) {
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ (info->icount.frame)++;
+ }
+ else if (status & 0x04) {
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ (info->icount.parity)++;
+ }
+
+ tty->flip.flag_buf_ptr++;
+
+ schedule_delayed_work(&tty->flip.work, 1);
+ }
+
+ if (dma_bytes != num_bytes) {
+ num_bytes = dma_bytes - num_bytes;
+ dma_bytes = 0;
+ receive_chars_dma(info, num_bytes);
+ } else
+ dma_bytes = 0;
+}
+
+/* Caller must hold info->lock */
+
+static inline void transmit_chars_pio(struct esp_struct *info,
+ int space_avail)
+{
+ int i;
+ struct esp_pio_buffer *pio_buf;
+
+ pio_buf = get_pio_buffer();
+
+ if (!pio_buf)
+ return;
+
+ while (space_avail && info->xmit_cnt) {
+ if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
+ memcpy(pio_buf->data,
+ &(info->xmit_buf[info->xmit_tail]),
+ space_avail);
+ } else {
+ i = ESP_XMIT_SIZE - info->xmit_tail;
+ memcpy(pio_buf->data,
+ &(info->xmit_buf[info->xmit_tail]), i);
+ memcpy(&(pio_buf->data[i]), info->xmit_buf,
+ space_avail - i);
+ }
+
+ info->xmit_cnt -= space_avail;
+ info->xmit_tail = (info->xmit_tail + space_avail) &
+ (ESP_XMIT_SIZE - 1);
+
+ for (i = 0; i < space_avail - 1; i += 2) {
+ outw(*((unsigned short *)(pio_buf->data + i)),
+ info->port + UART_ESI_TX);
+ }
+
+ if (space_avail & 0x0001)
+ serial_out(info, UART_ESI_TX,
+ pio_buf->data[space_avail - 1]);
+
+ if (info->xmit_cnt) {
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
+ space_avail = serial_in(info, UART_ESI_STAT1) << 8;
+ space_avail |= serial_in(info, UART_ESI_STAT2);
+
+ if (space_avail > info->xmit_cnt)
+ space_avail = info->xmit_cnt;
+ }
+ }
+
+ if (info->xmit_cnt < WAKEUP_CHARS) {
+ rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("THRE...");
+#endif
+
+ if (info->xmit_cnt <= 0) {
+ info->IER &= ~UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1,
+ ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+ }
+
+ release_pio_buffer(pio_buf);
+}
+
+/* Caller must hold info->lock */
+static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
+{
+ unsigned long flags;
+
+ dma_bytes = num_bytes;
+
+ if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
+ memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
+ dma_bytes);
+ } else {
+ int i = ESP_XMIT_SIZE - info->xmit_tail;
+ memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
+ i);
+ memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
+ }
+
+ info->xmit_cnt -= dma_bytes;
+ info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
+
+ if (info->xmit_cnt < WAKEUP_CHARS) {
+ rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("THRE...");
+#endif
+
+ if (info->xmit_cnt <= 0) {
+ info->IER &= ~UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+ }
+
+ info->stat_flags |= ESP_STAT_DMA_TX;
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma, DMA_MODE_WRITE);
+ set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+ set_dma_count(dma, dma_bytes);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
+}
+
+static inline void transmit_chars_dma_done(struct esp_struct *info)
+{
+ int num_bytes;
+ unsigned long flags;
+
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+
+ num_bytes = dma_bytes - get_dma_residue(dma);
+ info->icount.tx += dma_bytes;
+ release_dma_lock(flags);
+
+ if (dma_bytes != num_bytes) {
+ dma_bytes -= num_bytes;
+ memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
+
+ flags=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ set_dma_mode(dma, DMA_MODE_WRITE);
+ set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
+ set_dma_count(dma, dma_bytes);
+ enable_dma(dma);
+ release_dma_lock(flags);
+
+ serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
+ } else {
+ dma_bytes = 0;
+ info->stat_flags &= ~ESP_STAT_DMA_TX;
+ }
+}
+
+static inline void check_modem_status(struct esp_struct *info)
+{
+ int status;
+
+ serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
+ status = serial_in(info, UART_ESI_STAT2);
+
+ if (status & UART_MSR_ANY_DELTA) {
+ /* update input line counters */
+ if (status & UART_MSR_TERI)
+ info->icount.rng++;
+ if (status & UART_MSR_DDSR)
+ info->icount.dsr++;
+ if (status & UART_MSR_DDCD)
+ info->icount.dcd++;
+ if (status & UART_MSR_DCTS)
+ info->icount.cts++;
+ wake_up_interruptible(&info->delta_msr_wait);
+ }
+
+ if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
+#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
+ printk("ttys%d CD now %s...", info->line,
+ (status & UART_MSR_DCD) ? "on" : "off");
+#endif
+ if (status & UART_MSR_DCD)
+ wake_up_interruptible(&info->open_wait);
+ else {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("scheduling hangup...");
+#endif
+ schedule_work(&info->tqueue_hangup);
+ }
+ }
+}
+
+/*
+ * This is the serial driver's interrupt routine
+ */
+static irqreturn_t rs_interrupt_single(int irq, void *dev_id,
+ struct pt_regs *regs)
+{
+ struct esp_struct * info;
+ unsigned err_status;
+ unsigned int scratch;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("rs_interrupt_single(%d)...", irq);
+#endif
+ info = (struct esp_struct *)dev_id;
+ err_status = 0;
+ scratch = serial_in(info, UART_ESI_SID);
+
+ spin_lock(&info->lock);
+
+ if (!info->tty) {
+ spin_unlock(&info->lock);
+ return IRQ_NONE;
+ }
+
+ if (scratch & 0x04) { /* error */
+ serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
+ err_status = serial_in(info, UART_ESI_STAT1);
+ serial_in(info, UART_ESI_STAT2);
+
+ if (err_status & 0x01)
+ info->stat_flags |= ESP_STAT_RX_TIMEOUT;
+
+ if (err_status & 0x20) /* UART status */
+ check_modem_status(info);
+
+ if (err_status & 0x80) /* Start break */
+ wake_up_interruptible(&info->break_wait);
+ }
+
+ if ((scratch & 0x88) || /* DMA completed or timed out */
+ (err_status & 0x1c) /* receive error */) {
+ if (info->stat_flags & ESP_STAT_DMA_RX)
+ receive_chars_dma_done(info, err_status);
+ else if (info->stat_flags & ESP_STAT_DMA_TX)
+ transmit_chars_dma_done(info);
+ }
+
+ if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
+ ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
+ (info->IER & UART_IER_RDI)) {
+ int num_bytes;
+
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
+ num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
+ num_bytes |= serial_in(info, UART_ESI_STAT2);
+
+ if (num_bytes > (TTY_FLIPBUF_SIZE - info->tty->flip.count))
+ num_bytes = TTY_FLIPBUF_SIZE - info->tty->flip.count;
+
+ if (num_bytes) {
+ if (dma_bytes ||
+ (info->stat_flags & ESP_STAT_USE_PIO) ||
+ (num_bytes <= info->config.pio_threshold))
+ receive_chars_pio(info, num_bytes);
+ else
+ receive_chars_dma(info, num_bytes);
+ }
+ }
+
+ if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
+ (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
+ if ((info->xmit_cnt <= 0) || info->tty->stopped) {
+ info->IER &= ~UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ } else {
+ int num_bytes;
+
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
+ num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
+ num_bytes |= serial_in(info, UART_ESI_STAT2);
+
+ if (num_bytes > info->xmit_cnt)
+ num_bytes = info->xmit_cnt;
+
+ if (num_bytes) {
+ if (dma_bytes ||
+ (info->stat_flags & ESP_STAT_USE_PIO) ||
+ (num_bytes <= info->config.pio_threshold))
+ transmit_chars_pio(info, num_bytes);
+ else
+ transmit_chars_dma(info, num_bytes);
+ }
+ }
+ }
+
+ info->last_active = jiffies;
+
+#ifdef SERIAL_DEBUG_INTR
+ printk("end.\n");
+#endif
+ spin_unlock(&info->lock);
+ return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+static void do_softint(void *private_)
+{
+ struct esp_struct *info = (struct esp_struct *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
+ tty_wakeup(tty);
+ }
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> esp_hangup()
+ *
+ */
+static void do_serial_hangup(void *private_)
+{
+ struct esp_struct *info = (struct esp_struct *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (tty)
+ tty_hangup(tty);
+}
+
+/*
+ * ---------------------------------------------------------------
+ * Low level utility subroutines for the serial driver: routines to
+ * figure out the appropriate timeout for an interrupt chain, routines
+ * to initialize and startup a serial port, and routines to shutdown a
+ * serial port. Useful stuff like that.
+ *
+ * Caller should hold lock
+ * ---------------------------------------------------------------
+ */
+
+static inline void esp_basic_init(struct esp_struct * info)
+{
+ /* put ESPC in enhanced mode */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
+
+ if (info->stat_flags & ESP_STAT_NEVER_DMA)
+ serial_out(info, UART_ESI_CMD2, 0x01);
+ else
+ serial_out(info, UART_ESI_CMD2, 0x31);
+
+ /* disable interrupts for now */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+
+ /* set interrupt and DMA channel */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
+
+ if (info->stat_flags & ESP_STAT_NEVER_DMA)
+ serial_out(info, UART_ESI_CMD2, 0x01);
+ else
+ serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
+
+ serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
+
+ if (info->line % 8) /* secondary port */
+ serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
+ else if (info->irq == 9)
+ serial_out(info, UART_ESI_CMD2, 0x02);
+ else
+ serial_out(info, UART_ESI_CMD2, info->irq);
+
+ /* set error status mask (check this) */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
+
+ if (info->stat_flags & ESP_STAT_NEVER_DMA)
+ serial_out(info, UART_ESI_CMD2, 0xa1);
+ else
+ serial_out(info, UART_ESI_CMD2, 0xbd);
+
+ serial_out(info, UART_ESI_CMD2, 0x00);
+
+ /* set DMA timeout */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
+ serial_out(info, UART_ESI_CMD2, 0xff);
+
+ /* set FIFO trigger levels */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
+ serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
+ serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
+ serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
+ serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
+
+ /* Set clock scaling and wait states */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
+ serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
+
+ /* set reinterrupt pacing */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
+ serial_out(info, UART_ESI_CMD2, 0xff);
+}
+
+static int startup(struct esp_struct * info)
+{
+ unsigned long flags;
+ int retval=0;
+ unsigned int num_chars;
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (info->flags & ASYNC_INITIALIZED)
+ goto out;
+
+ if (!info->xmit_buf) {
+ info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
+ retval = -ENOMEM;
+ if (!info->xmit_buf)
+ goto out;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttys%d (irq %d)...", info->line, info->irq);
+#endif
+
+ /* Flush the RX buffer. Using the ESI flush command may cause */
+ /* wild interrupts, so read all the data instead. */
+
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
+ num_chars = serial_in(info, UART_ESI_STAT1) << 8;
+ num_chars |= serial_in(info, UART_ESI_STAT2);
+
+ while (num_chars > 1) {
+ inw(info->port + UART_ESI_RX);
+ num_chars -= 2;
+ }
+
+ if (num_chars)
+ serial_in(info, UART_ESI_RX);
+
+ /* set receive character timeout */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
+ serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
+
+ /* clear all flags except the "never DMA" flag */
+ info->stat_flags &= ESP_STAT_NEVER_DMA;
+
+ if (info->stat_flags & ESP_STAT_NEVER_DMA)
+ info->stat_flags |= ESP_STAT_USE_PIO;
+
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ /*
+ * Allocate the IRQ
+ */
+
+ retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ,
+ "esp serial", info);
+
+ if (retval) {
+ if (capable(CAP_SYS_ADMIN)) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR,
+ &info->tty->flags);
+ retval = 0;
+ }
+ goto out_unlocked;
+ }
+
+ if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
+ dma_buffer = (char *)__get_dma_pages(
+ GFP_KERNEL, get_order(DMA_BUFFER_SZ));
+
+ /* use PIO mode if DMA buf/chan cannot be allocated */
+ if (!dma_buffer)
+ info->stat_flags |= ESP_STAT_USE_PIO;
+ else if (request_dma(dma, "esp serial")) {
+ free_pages((unsigned long)dma_buffer,
+ get_order(DMA_BUFFER_SZ));
+ dma_buffer = NULL;
+ info->stat_flags |= ESP_STAT_USE_PIO;
+ }
+
+ }
+
+ info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, info->MCR);
+
+ /*
+ * Finally, enable interrupts
+ */
+ /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
+ info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
+ UART_IER_DMA_TC;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ /*
+ * Set up the tty->alt_speed kludge
+ */
+ if (info->tty) {
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ info->tty->alt_speed = 57600;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ info->tty->alt_speed = 115200;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ info->tty->alt_speed = 230400;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ info->tty->alt_speed = 460800;
+ }
+
+ /*
+ * set the speed of the serial port
+ */
+ change_speed(info);
+ info->flags |= ASYNC_INITIALIZED;
+ return 0;
+
+out:
+ spin_unlock_irqrestore(&info->lock, flags);
+out_unlocked:
+ return retval;
+}
+
+/*
+ * 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 esp_struct * info)
+{
+ unsigned long flags, f;
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....", info->line,
+ info->irq);
+#endif
+
+ spin_lock_irqsave(&info->lock, flags);
+ /*
+ * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+ * here so the queue might never be waken up
+ */
+ wake_up_interruptible(&info->delta_msr_wait);
+ wake_up_interruptible(&info->break_wait);
+
+ /* stop a DMA transfer on the port being closed */
+ /* DMA lock is higher priority always */
+ if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
+ f=claim_dma_lock();
+ disable_dma(dma);
+ clear_dma_ff(dma);
+ release_dma_lock(f);
+
+ dma_bytes = 0;
+ }
+
+ /*
+ * Free the IRQ
+ */
+ free_irq(info->irq, info);
+
+ if (dma_buffer) {
+ struct esp_struct *current_port = ports;
+
+ while (current_port) {
+ if ((current_port != info) &&
+ (current_port->flags & ASYNC_INITIALIZED))
+ break;
+
+ current_port = current_port->next_port;
+ }
+
+ if (!current_port) {
+ free_dma(dma);
+ free_pages((unsigned long)dma_buffer,
+ get_order(DMA_BUFFER_SZ));
+ dma_buffer = NULL;
+ }
+ }
+
+ if (info->xmit_buf) {
+ free_page((unsigned long) info->xmit_buf);
+ info->xmit_buf = NULL;
+ }
+
+ info->IER = 0;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+
+ if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+ info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
+
+ info->MCR &= ~UART_MCR_OUT2;
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, info->MCR);
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ASYNC_INITIALIZED;
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/*
+ * 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 esp_struct *info)
+{
+ unsigned short port;
+ int quot = 0;
+ unsigned cflag,cval;
+ int baud, bits;
+ unsigned char flow1 = 0, flow2 = 0;
+ unsigned long flags;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ port = info->port;
+
+ /* byte size and parity */
+ switch (cflag & CSIZE) {
+ case CS5: cval = 0x00; bits = 7; break;
+ case CS6: cval = 0x01; bits = 8; break;
+ case CS7: cval = 0x02; bits = 9; break;
+ case CS8: cval = 0x03; bits = 10; break;
+ default: cval = 0x00; bits = 7; break;
+ }
+ if (cflag & CSTOPB) {
+ cval |= 0x04;
+ bits++;
+ }
+ if (cflag & PARENB) {
+ cval |= UART_LCR_PARITY;
+ bits++;
+ }
+ if (!(cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+ if (cflag & CMSPAR)
+ cval |= UART_LCR_SPAR;
+#endif
+
+ baud = tty_get_baud_rate(info->tty);
+ if (baud == 38400 &&
+ ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
+ quot = info->custom_divisor;
+ else {
+ if (baud == 134)
+ /* Special case since 134 is really 134.5 */
+ quot = (2*BASE_BAUD / 269);
+ else if (baud)
+ quot = BASE_BAUD / baud;
+ }
+ /* If the quotient is ever zero, default to 9600 bps */
+ if (!quot)
+ quot = BASE_BAUD / 9600;
+
+ info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
+
+ /* CTS flow control flag and modem status interrupts */
+ /* info->IER &= ~UART_IER_MSI; */
+ if (cflag & CRTSCTS) {
+ info->flags |= ASYNC_CTS_FLOW;
+ /* info->IER |= UART_IER_MSI; */
+ flow1 = 0x04;
+ flow2 = 0x10;
+ } else
+ info->flags &= ~ASYNC_CTS_FLOW;
+ if (cflag & CLOCAL)
+ info->flags &= ~ASYNC_CHECK_CD;
+ else {
+ info->flags |= ASYNC_CHECK_CD;
+ /* info->IER |= UART_IER_MSI; */
+ }
+
+ /*
+ * Set up parity check flag
+ */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+ info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+ if (I_INPCK(info->tty))
+ info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+ if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+ info->read_status_mask |= UART_LSR_BI;
+
+ info->ignore_status_mask = 0;
+#if 0
+ /* This should be safe, but for some broken bits of hardware... */
+ if (I_IGNPAR(info->tty)) {
+ info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ }
+#endif
+ if (I_IGNBRK(info->tty)) {
+ info->ignore_status_mask |= UART_LSR_BI;
+ info->read_status_mask |= UART_LSR_BI;
+ /*
+ * If we're ignore parity and break indicators, ignore
+ * overruns too. (For real raw support).
+ */
+ if (I_IGNPAR(info->tty)) {
+ info->ignore_status_mask |= UART_LSR_OE | \
+ UART_LSR_PE | UART_LSR_FE;
+ info->read_status_mask |= UART_LSR_OE | \
+ UART_LSR_PE | UART_LSR_FE;
+ }
+ }
+
+ if (I_IXOFF(info->tty))
+ flow1 |= 0x81;
+
+ spin_lock_irqsave(&info->lock, flags);
+ /* set baud */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
+ serial_out(info, UART_ESI_CMD2, quot >> 8);
+ serial_out(info, UART_ESI_CMD2, quot & 0xff);
+
+ /* set data bits, parity, etc. */
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_LCR);
+ serial_out(info, UART_ESI_CMD2, cval);
+
+ /* Enable flow control */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
+ serial_out(info, UART_ESI_CMD2, flow1);
+ serial_out(info, UART_ESI_CMD2, flow2);
+
+ /* set flow control characters (XON/XOFF only) */
+ if (I_IXOFF(info->tty)) {
+ serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
+ serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
+ serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
+ serial_out(info, UART_ESI_CMD2, 0x10);
+ serial_out(info, UART_ESI_CMD2, 0x21);
+ switch (cflag & CSIZE) {
+ case CS5:
+ serial_out(info, UART_ESI_CMD2, 0x1f);
+ break;
+ case CS6:
+ serial_out(info, UART_ESI_CMD2, 0x3f);
+ break;
+ case CS7:
+ case CS8:
+ serial_out(info, UART_ESI_CMD2, 0x7f);
+ break;
+ default:
+ serial_out(info, UART_ESI_CMD2, 0xff);
+ break;
+ }
+ }
+
+ /* Set high/low water */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
+ serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
+ serial_out(info, UART_ESI_CMD2, info->config.flow_off);
+ serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
+ serial_out(info, UART_ESI_CMD2, info->config.flow_on);
+
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_put_char"))
+ return;
+
+ if (!tty || !info->xmit_buf)
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+ if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
+ info->xmit_buf[info->xmit_head++] = ch;
+ info->xmit_head &= ESP_XMIT_SIZE-1;
+ info->xmit_cnt++;
+ }
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
+ goto out;
+
+ if (!(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+out:
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static int rs_write(struct tty_struct * tty,
+ const unsigned char *buf, int count)
+{
+ int c, t, ret = 0;
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write"))
+ return 0;
+
+ if (!tty || !info->xmit_buf || !tmp_buf)
+ return 0;
+
+ while (1) {
+ /* Thanks to R. Wolff for suggesting how to do this with */
+ /* interrupts enabled */
+
+ c = count;
+ t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
+
+ if (t < c)
+ c = t;
+
+ t = ESP_XMIT_SIZE - info->xmit_head;
+
+ if (t < c)
+ c = t;
+
+ if (c <= 0)
+ break;
+
+ memcpy(info->xmit_buf + info->xmit_head, buf, c);
+
+ info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
+ info->xmit_cnt += c;
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
+ info->IER |= UART_IER_THRI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ }
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ int ret;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+ return 0;
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
+ if (ret < 0)
+ ret = 0;
+ spin_unlock_irqrestore(&info->lock, flags);
+ return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct esp_struct *info = (struct esp_struct *)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 esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+ return;
+ spin_lock_irqsave(&info->lock, flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ spin_unlock_irqrestore(&info->lock, 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 esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+ info->IER &= ~UART_IER_RDI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+ info->IER |= UART_IER_RDI;
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+ serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
+ serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct esp_struct * info,
+ struct serial_struct __user *retinfo)
+{
+ struct serial_struct tmp;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = PORT_16550A;
+ tmp.line = info->line;
+ tmp.port = info->port;
+ tmp.irq = info->irq;
+ tmp.flags = info->flags;
+ tmp.xmit_fifo_size = 1024;
+ tmp.baud_base = BASE_BAUD;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+ tmp.custom_divisor = info->custom_divisor;
+ tmp.hub6 = 0;
+ if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+ return -EFAULT;
+ return 0;
+}
+
+static int get_esp_config(struct esp_struct * info,
+ struct hayes_esp_config __user *retinfo)
+{
+ struct hayes_esp_config tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.rx_timeout = info->config.rx_timeout;
+ tmp.rx_trigger = info->config.rx_trigger;
+ tmp.tx_trigger = info->config.tx_trigger;
+ tmp.flow_off = info->config.flow_off;
+ tmp.flow_on = info->config.flow_on;
+ tmp.pio_threshold = info->config.pio_threshold;
+ tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
+
+ return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+static int set_serial_info(struct esp_struct * info,
+ struct serial_struct __user *new_info)
+{
+ struct serial_struct new_serial;
+ struct esp_struct old_info;
+ unsigned int change_irq;
+ int retval = 0;
+ struct esp_struct *current_async;
+
+ if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+ return -EFAULT;
+ old_info = *info;
+
+ if ((new_serial.type != PORT_16550A) ||
+ (new_serial.hub6) ||
+ (info->port != new_serial.port) ||
+ (new_serial.baud_base != BASE_BAUD) ||
+ (new_serial.irq > 15) ||
+ (new_serial.irq < 2) ||
+ (new_serial.irq == 6) ||
+ (new_serial.irq == 8) ||
+ (new_serial.irq == 13))
+ return -EINVAL;
+
+ change_irq = new_serial.irq != info->irq;
+
+ if (change_irq && (info->line % 8))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ if (change_irq ||
+ (new_serial.close_delay != info->close_delay) ||
+ ((new_serial.flags & ~ASYNC_USR_MASK) !=
+ (info->flags & ~ASYNC_USR_MASK)))
+ return -EPERM;
+ info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+ (new_serial.flags & ASYNC_USR_MASK));
+ info->custom_divisor = new_serial.custom_divisor;
+ } else {
+ if (new_serial.irq == 2)
+ new_serial.irq = 9;
+
+ if (change_irq) {
+ current_async = ports;
+
+ while (current_async) {
+ if ((current_async->line >= info->line) &&
+ (current_async->line < (info->line + 8))) {
+ if (current_async == info) {
+ if (current_async->count > 1)
+ return -EBUSY;
+ } else if (current_async->count)
+ return -EBUSY;
+ }
+
+ current_async = current_async->next_port;
+ }
+ }
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ info->flags = ((info->flags & ~ASYNC_FLAGS) |
+ (new_serial.flags & ASYNC_FLAGS));
+ info->custom_divisor = new_serial.custom_divisor;
+ info->close_delay = new_serial.close_delay * HZ/100;
+ info->closing_wait = new_serial.closing_wait * HZ/100;
+
+ if (change_irq) {
+ /*
+ * We need to shutdown the serial port at the old
+ * port/irq combination.
+ */
+ shutdown(info);
+
+ current_async = ports;
+
+ while (current_async) {
+ if ((current_async->line >= info->line) &&
+ (current_async->line < (info->line + 8)))
+ current_async->irq = new_serial.irq;
+
+ current_async = current_async->next_port;
+ }
+
+ serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
+ if (info->irq == 9)
+ serial_out(info, UART_ESI_CMD2, 0x02);
+ else
+ serial_out(info, UART_ESI_CMD2, info->irq);
+ }
+ }
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ if (((old_info.flags & ASYNC_SPD_MASK) !=
+ (info->flags & ASYNC_SPD_MASK)) ||
+ (old_info.custom_divisor != info->custom_divisor)) {
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ info->tty->alt_speed = 57600;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ info->tty->alt_speed = 115200;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ info->tty->alt_speed = 230400;
+ if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ info->tty->alt_speed = 460800;
+ change_speed(info);
+ }
+ } else
+ retval = startup(info);
+
+ return retval;
+}
+
+static int set_esp_config(struct esp_struct * info,
+ struct hayes_esp_config __user * new_info)
+{
+ struct hayes_esp_config new_config;
+ unsigned int change_dma;
+ int retval = 0;
+ struct esp_struct *current_async;
+ unsigned long flags;
+
+ /* Perhaps a non-sysadmin user should be able to do some of these */
+ /* operations. I haven't decided yet. */
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&new_config, new_info, sizeof(new_config)))
+ return -EFAULT;
+
+ if ((new_config.flow_on >= new_config.flow_off) ||
+ (new_config.rx_trigger < 1) ||
+ (new_config.tx_trigger < 1) ||
+ (new_config.flow_off < 1) ||
+ (new_config.flow_on < 1) ||
+ (new_config.rx_trigger > 1023) ||
+ (new_config.tx_trigger > 1023) ||
+ (new_config.flow_off > 1023) ||
+ (new_config.flow_on > 1023) ||
+ (new_config.pio_threshold < 0) ||
+ (new_config.pio_threshold > 1024))
+ return -EINVAL;
+
+ if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
+ new_config.dma_channel = 0;
+
+ if (info->stat_flags & ESP_STAT_NEVER_DMA)
+ change_dma = new_config.dma_channel;
+ else
+ change_dma = (new_config.dma_channel != dma);
+
+ if (change_dma) {
+ if (new_config.dma_channel) {
+ /* PIO mode to DMA mode transition OR */
+ /* change current DMA channel */
+
+ current_async = ports;
+
+ while (current_async) {
+ if (current_async == info) {
+ if (current_async->count > 1)
+ return -EBUSY;
+ } else if (current_async->count)
+ return -EBUSY;
+
+ current_async =
+ current_async->next_port;
+ }
+
+ shutdown(info);
+ dma = new_config.dma_channel;
+ info->stat_flags &= ~ESP_STAT_NEVER_DMA;
+
+ /* all ports must use the same DMA channel */
+
+ spin_lock_irqsave(&info->lock, flags);
+ current_async = ports;
+
+ while (current_async) {
+ esp_basic_init(current_async);
+ current_async = current_async->next_port;
+ }
+ spin_unlock_irqrestore(&info->lock, flags);
+ } else {
+ /* DMA mode to PIO mode only */
+
+ if (info->count > 1)
+ return -EBUSY;
+
+ shutdown(info);
+ spin_lock_irqsave(&info->lock, flags);
+ info->stat_flags |= ESP_STAT_NEVER_DMA;
+ esp_basic_init(info);
+ spin_unlock_irqrestore(&info->lock, flags);
+ }
+ }
+
+ info->config.pio_threshold = new_config.pio_threshold;
+
+ if ((new_config.flow_off != info->config.flow_off) ||
+ (new_config.flow_on != info->config.flow_on)) {
+ unsigned long flags;
+
+ info->config.flow_off = new_config.flow_off;
+ info->config.flow_on = new_config.flow_on;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
+ serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
+ serial_out(info, UART_ESI_CMD2, new_config.flow_off);
+ serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
+ serial_out(info, UART_ESI_CMD2, new_config.flow_on);
+ spin_unlock_irqrestore(&info->lock, flags);
+ }
+
+ if ((new_config.rx_trigger != info->config.rx_trigger) ||
+ (new_config.tx_trigger != info->config.tx_trigger)) {
+ unsigned long flags;
+
+ info->config.rx_trigger = new_config.rx_trigger;
+ info->config.tx_trigger = new_config.tx_trigger;
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
+ serial_out(info, UART_ESI_CMD2,
+ new_config.rx_trigger >> 8);
+ serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
+ serial_out(info, UART_ESI_CMD2,
+ new_config.tx_trigger >> 8);
+ serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
+ spin_unlock_irqrestore(&info->lock, flags);
+ }
+
+ if (new_config.rx_timeout != info->config.rx_timeout) {
+ unsigned long flags;
+
+ info->config.rx_timeout = new_config.rx_timeout;
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (info->IER & UART_IER_RDI) {
+ serial_out(info, UART_ESI_CMD1,
+ ESI_SET_RX_TIMEOUT);
+ serial_out(info, UART_ESI_CMD2,
+ new_config.rx_timeout);
+ }
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ }
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ retval = startup(info);
+
+ return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ */
+static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
+{
+ unsigned char status;
+ unsigned int result;
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
+ status = serial_in(info, UART_ESI_STAT1);
+ spin_unlock_irqrestore(&info->lock, flags);
+ result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
+ return put_user(result,value);
+}
+
+
+static int esp_tiocmget(struct tty_struct *tty, struct file *file)
+{
+ struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+ unsigned char control, status;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, __FUNCTION__))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ control = info->MCR;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
+ status = serial_in(info, UART_ESI_STAT2);
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
+ | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
+ | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
+ | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
+ | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
+ | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
+}
+
+static int esp_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, __FUNCTION__))
+ return -ENODEV;
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (set & TIOCM_RTS)
+ info->MCR |= UART_MCR_RTS;
+ if (set & TIOCM_DTR)
+ info->MCR |= UART_MCR_DTR;
+
+ if (clear & TIOCM_RTS)
+ info->MCR &= ~UART_MCR_RTS;
+ if (clear & TIOCM_DTR)
+ info->MCR &= ~UART_MCR_DTR;
+
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, info->MCR);
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ return 0;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static void esp_break(struct tty_struct *tty, int break_state)
+{
+ struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "esp_break"))
+ return;
+
+ if (break_state == -1) {
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
+ serial_out(info, UART_ESI_CMD2, 0x01);
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ /* FIXME - new style wait needed here */
+ interruptible_sleep_on(&info->break_wait);
+ } else {
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+ spin_unlock_irqrestore(&info->lock, flags);
+ }
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+ struct async_icount cprev, cnow; /* kernel counter temps */
+ struct serial_icounter_struct __user *p_cuser; /* user space */
+ void __user *argp = (void __user *)arg;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
+ (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
+ (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
+ (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TIOCGSERIAL:
+ return get_serial_info(info, argp);
+ case TIOCSSERIAL:
+ return set_serial_info(info, argp);
+ case TIOCSERCONFIG:
+ /* do not reconfigure after initial configuration */
+ return 0;
+
+ case TIOCSERGWILD:
+ return put_user(0L, (unsigned long __user *)argp);
+
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, argp);
+
+ case TIOCSERSWILD:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return 0;
+
+ /*
+ * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+ * - mask passed in arg for lines of interest
+ * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ */
+ case TIOCMIWAIT:
+ spin_lock_irqsave(&info->lock, flags);
+ cprev = info->icount; /* note the counters on entry */
+ spin_unlock_irqrestore(&info->lock, flags);
+ while (1) {
+ /* FIXME: convert to new style wakeup */
+ interruptible_sleep_on(&info->delta_msr_wait);
+ /* see if a signal did it */
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ spin_lock_irqsave(&info->lock, flags);
+ cnow = info->icount; /* atomic copy */
+ spin_unlock_irqrestore(&info->lock, flags);
+ if (cnow.rng == cprev.rng &&
+ cnow.dsr == cprev.dsr &&
+ cnow.dcd == cprev.dcd &&
+ cnow.cts == cprev.cts)
+ return -EIO; /* no change => error */
+ if (((arg & TIOCM_RNG) &&
+ (cnow.rng != cprev.rng)) ||
+ ((arg & TIOCM_DSR) &&
+ (cnow.dsr != cprev.dsr)) ||
+ ((arg & TIOCM_CD) &&
+ (cnow.dcd != cprev.dcd)) ||
+ ((arg & TIOCM_CTS) &&
+ (cnow.cts != cprev.cts)) ) {
+ return 0;
+ }
+ cprev = cnow;
+ }
+ /* NOTREACHED */
+
+ /*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ * RI where only 0->1 is counted.
+ */
+ case TIOCGICOUNT:
+ spin_lock_irqsave(&info->lock, flags);
+ cnow = info->icount;
+ spin_unlock_irqrestore(&info->lock, flags);
+ p_cuser = argp;
+ if (put_user(cnow.cts, &p_cuser->cts) ||
+ put_user(cnow.dsr, &p_cuser->dsr) ||
+ put_user(cnow.rng, &p_cuser->rng) ||
+ put_user(cnow.dcd, &p_cuser->dcd))
+ return -EFAULT;
+
+ return 0;
+ case TIOCGHAYESESP:
+ return get_esp_config(info, argp);
+ case TIOCSHAYESESP:
+ return set_esp_config(info, argp);
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if ( (tty->termios->c_cflag == old_termios->c_cflag)
+ && ( RELEVANT_IFLAG(tty->termios->c_iflag)
+ == RELEVANT_IFLAG(old_termios->c_iflag)))
+ return;
+
+ change_speed(info);
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ /* Handle transition to B0 status */
+ if ((old_termios->c_cflag & CBAUD) &&
+ !(tty->termios->c_cflag & CBAUD)) {
+ info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, info->MCR);
+ }
+
+ /* Handle transition away from B0 status */
+ if (!(old_termios->c_cflag & CBAUD) &&
+ (tty->termios->c_cflag & CBAUD)) {
+ info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, info->MCR);
+ }
+
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ /* Handle turning of CRTSCTS */
+ 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
+ * async 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 esp_struct * info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+ return;
+
+ spin_lock_irqsave(&info->lock, flags);
+
+ if (tty_hung_up_p(filp)) {
+ DBG_CNT("before DEC-hung");
+ goto out;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_close ttys%d, count = %d\n", info->line, info->count);
+#endif
+ if ((tty->count == 1) && (info->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. Info->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk("rs_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+ if (--info->count < 0) {
+ printk("rs_close: bad serial port count for ttys%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+ if (info->count) {
+ DBG_CNT("before DEC-2");
+ goto out;
+ }
+ info->flags |= ASYNC_CLOSING;
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+ if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, info->closing_wait);
+ /*
+ * At this point we stop accepting input. To do this, we
+ * disable the receive line status interrupts, and tell the
+ * interrupt driver to stop checking the data ready bit in the
+ * line status register.
+ */
+ /* info->IER &= ~UART_IER_RLSI; */
+ info->IER &= ~UART_IER_RDI;
+ info->read_status_mask &= ~UART_LSR_DR;
+ if (info->flags & ASYNC_INITIALIZED) {
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
+ serial_out(info, UART_ESI_CMD2, info->IER);
+
+ /* disable receive timeout */
+ serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important if there is a transmit FIFO!
+ */
+ rs_wait_until_sent(tty, info->timeout);
+ }
+ shutdown(info);
+ if (tty->driver->flush_buffer)
+ tty->driver->flush_buffer(tty);
+ tty_ldisc_flush(tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = NULL;
+
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ msleep_interruptible(jiffies_to_msecs(info->close_delay));
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ return;
+
+out:
+ spin_unlock_irqrestore(&info->lock, flags);
+}
+
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long orig_jiffies, char_time;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
+ return;
+
+ orig_jiffies = jiffies;
+ char_time = ((info->timeout - HZ / 50) / 1024) / 5;
+
+ if (!char_time)
+ char_time = 1;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
+
+ while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
+ (serial_in(info, UART_ESI_STAT2) != 0xff)) {
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ msleep_interruptible(jiffies_to_msecs(char_time));
+
+ if (signal_pending(current))
+ break;
+
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+
+ spin_lock_irqsave(&info->lock, flags);
+ serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
+ serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
+ }
+ spin_unlock_irqrestore(&info->lock, flags);
+ set_current_state(TASK_RUNNING);
+}
+
+/*
+ * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void esp_hangup(struct tty_struct *tty)
+{
+ struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->name, "esp_hangup"))
+ return;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~ASYNC_NORMAL_ACTIVE;
+ info->tty = NULL;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * esp_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct esp_struct *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int retval;
+ int do_clocal = 0;
+ unsigned long flags;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, info->count is dropped by one, so that
+ * rs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ spin_lock_irqsave(&info->lock, flags);
+ if (!tty_hung_up_p(filp))
+ info->count--;
+ info->blocked_open++;
+ while (1) {
+ if ((tty->termios->c_cflag & CBAUD)) {
+ unsigned int scratch;
+
+ serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ scratch = serial_in(info, UART_ESI_STAT1);
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2,
+ scratch | UART_MCR_DTR | UART_MCR_RTS);
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+
+ serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
+ if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
+ do_clocal = 1;
+
+ if (!(info->flags & ASYNC_CLOSING) &&
+ (do_clocal))
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ spin_unlock_irqrestore(&info->lock, flags);
+ schedule();
+ spin_lock_irqsave(&info->lock, flags);
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ info->count++;
+ info->blocked_open--;
+ spin_unlock_irqrestore(&info->lock, flags);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int esp_open(struct tty_struct *tty, struct file * filp)
+{
+ struct esp_struct *info;
+ int retval, line;
+ unsigned long flags;
+
+ line = tty->index;
+ if ((line < 0) || (line >= NR_PORTS))
+ return -ENODEV;
+
+ /* find the port in the chain */
+
+ info = ports;
+
+ while (info && (info->line != line))
+ info = info->next_port;
+
+ if (!info) {
+ serial_paranoia_check(info, tty->name, "esp_open");
+ return -ENODEV;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("esp_open %s, count = %d\n", tty->name, info->count);
+#endif
+ spin_lock_irqsave(&info->lock, flags);
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+
+ if (!tmp_buf) {
+ tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
+ if (!tmp_buf)
+ return -ENOMEM;
+ }
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("esp_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("esp_open %s successful...", tty->name);
+#endif
+ return 0;
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * espserial_init() and friends
+ *
+ * espserial_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+
+static inline void show_serial_version(void)
+{
+ printk(KERN_INFO "%s version %s (DMA %u)\n",
+ serial_name, serial_version, dma);
+}
+
+/*
+ * This routine is called by espserial_init() to initialize a specific serial
+ * port.
+ */
+static inline int autoconfig(struct esp_struct * info)
+{
+ int port_detected = 0;
+ unsigned long flags;
+
+ if (!request_region(info->port, REGION_SIZE, "esp serial"))
+ return -EIO;
+
+ spin_lock_irqsave(&info->lock, flags);
+ /*
+ * Check for ESP card
+ */
+
+ if (serial_in(info, UART_ESI_BASE) == 0xf3) {
+ serial_out(info, UART_ESI_CMD1, 0x00);
+ serial_out(info, UART_ESI_CMD1, 0x01);
+
+ if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
+ port_detected = 1;
+
+ if (!(info->irq)) {
+ serial_out(info, UART_ESI_CMD1, 0x02);
+
+ if (serial_in(info, UART_ESI_STAT1) & 0x01)
+ info->irq = 3;
+ else
+ info->irq = 4;
+ }
+
+
+ /* put card in enhanced mode */
+ /* this prevents access through */
+ /* the "old" IO ports */
+ esp_basic_init(info);
+
+ /* clear out MCR */
+ serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
+ serial_out(info, UART_ESI_CMD2, UART_MCR);
+ serial_out(info, UART_ESI_CMD2, 0x00);
+ }
+ }
+ if (!port_detected)
+ release_region(info->port, REGION_SIZE);
+
+ spin_unlock_irqrestore(&info->lock, flags);
+ return (port_detected);
+}
+
+static struct tty_operations esp_ops = {
+ .open = esp_open,
+ .close = rs_close,
+ .write = rs_write,
+ .put_char = rs_put_char,
+ .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 = esp_hangup,
+ .break_ctl = esp_break,
+ .wait_until_sent = rs_wait_until_sent,
+ .tiocmget = esp_tiocmget,
+ .tiocmset = esp_tiocmset,
+};
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+static int __init espserial_init(void)
+{
+ int i, offset;
+ struct esp_struct * info;
+ struct esp_struct *last_primary = NULL;
+ int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
+
+ esp_driver = alloc_tty_driver(NR_PORTS);
+ if (!esp_driver)
+ return -ENOMEM;
+
+ for (i = 0; i < NR_PRIMARY; i++) {
+ if (irq[i] != 0) {
+ if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
+ (irq[i] == 8) || (irq[i] == 13))
+ irq[i] = 0;
+ else if (irq[i] == 2)
+ irq[i] = 9;
+ }
+ }
+
+ if ((dma != 1) && (dma != 3))
+ dma = 0;
+
+ if ((rx_trigger < 1) || (rx_trigger > 1023))
+ rx_trigger = 768;
+
+ if ((tx_trigger < 1) || (tx_trigger > 1023))
+ tx_trigger = 768;
+
+ if ((flow_off < 1) || (flow_off > 1023))
+ flow_off = 1016;
+
+ if ((flow_on < 1) || (flow_on > 1023))
+ flow_on = 944;
+
+ if ((rx_timeout < 0) || (rx_timeout > 255))
+ rx_timeout = 128;
+
+ if (flow_on >= flow_off)
+ flow_on = flow_off - 1;
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+
+ esp_driver->owner = THIS_MODULE;
+ esp_driver->name = "ttyP";
+ esp_driver->devfs_name = "tts/P";
+ esp_driver->major = ESP_IN_MAJOR;
+ esp_driver->minor_start = 0;
+ esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ esp_driver->subtype = SERIAL_TYPE_NORMAL;
+ esp_driver->init_termios = tty_std_termios;
+ esp_driver->init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ esp_driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(esp_driver, &esp_ops);
+ if (tty_register_driver(esp_driver))
+ {
+ printk(KERN_ERR "Couldn't register esp serial driver");
+ put_tty_driver(esp_driver);
+ return 1;
+ }
+
+ info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
+
+ if (!info)
+ {
+ printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
+ tty_unregister_driver(esp_driver);
+ put_tty_driver(esp_driver);
+ return 1;
+ }
+
+ memset((void *)info, 0, sizeof(struct esp_struct));
+ /* rx_trigger, tx_trigger are needed by autoconfig */
+ info->config.rx_trigger = rx_trigger;
+ info->config.tx_trigger = tx_trigger;
+
+ i = 0;
+ offset = 0;
+
+ do {
+ info->port = esp[i] + offset;
+ info->irq = irq[i];
+ info->line = (i * 8) + (offset / 8);
+
+ if (!autoconfig(info)) {
+ i++;
+ offset = 0;
+ continue;
+ }
+
+ info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
+ info->flags = STD_COM_FLAGS;
+ if (info->custom_divisor)
+ info->flags |= ASYNC_SPD_CUST;
+ info->magic = ESP_MAGIC;
+ info->close_delay = 5*HZ/10;
+ info->closing_wait = 30*HZ;
+ INIT_WORK(&info->tqueue, do_softint, info);
+ INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
+ info->config.rx_timeout = rx_timeout;
+ info->config.flow_on = flow_on;
+ info->config.flow_off = flow_off;
+ info->config.pio_threshold = pio_threshold;
+ info->next_port = ports;
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ init_waitqueue_head(&info->delta_msr_wait);
+ init_waitqueue_head(&info->break_wait);
+ spin_lock_init(&info->lock);
+ ports = info;
+ printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
+ info->line, info->port, info->irq);
+
+ if (info->line % 8) {
+ printk("secondary port\n");
+ /* 8 port cards can't do DMA */
+ info->stat_flags |= ESP_STAT_NEVER_DMA;
+
+ if (last_primary)
+ last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
+ } else {
+ printk("primary port\n");
+ last_primary = info;
+ irq[i] = info->irq;
+ }
+
+ if (!dma)
+ info->stat_flags |= ESP_STAT_NEVER_DMA;
+
+ info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
+ if (!info)
+ {
+ printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
+
+ /* allow use of the already detected ports */
+ return 0;
+ }
+
+ memset((void *)info, 0, sizeof(struct esp_struct));
+ /* rx_trigger, tx_trigger are needed by autoconfig */
+ info->config.rx_trigger = rx_trigger;
+ info->config.tx_trigger = tx_trigger;
+
+ if (offset == 56) {
+ i++;
+ offset = 0;
+ } else {
+ offset += 8;
+ }
+ } while (i < NR_PRIMARY);
+
+ /* free the last port memory allocation */
+ kfree(info);
+
+ return 0;
+}
+
+static void __exit espserial_exit(void)
+{
+ int e1;
+ struct esp_struct *temp_async;
+ struct esp_pio_buffer *pio_buf;
+
+ /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
+ if ((e1 = tty_unregister_driver(esp_driver)))
+ printk("SERIAL: failed to unregister serial driver (%d)\n",
+ e1);
+ put_tty_driver(esp_driver);
+
+ while (ports) {
+ if (ports->port) {
+ release_region(ports->port, REGION_SIZE);
+ }
+ temp_async = ports->next_port;
+ kfree(ports);
+ ports = temp_async;
+ }
+
+ if (dma_buffer)
+ free_pages((unsigned long)dma_buffer,
+ get_order(DMA_BUFFER_SZ));
+
+ if (tmp_buf)
+ free_page((unsigned long)tmp_buf);
+
+ while (free_pio_buf) {
+ pio_buf = free_pio_buf->next;
+ kfree(free_pio_buf);
+ free_pio_buf = pio_buf;
+ }
+}
+
+module_init(espserial_init);
+module_exit(espserial_exit);