#include <linux/serial.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
-#include <linux/atomic.h>
#include <linux/io.h>
#include <linux/ipack.h>
#include "ipoctal.h"
spinlock_t lock;
unsigned int pointer_read;
unsigned int pointer_write;
- atomic_t open;
struct tty_port tty_port;
union scc2698_channel __iomem *regs;
union scc2698_block __iomem *block_regs;
unsigned int board_id;
- unsigned char *board_write;
u8 isr_rx_rdy_mask;
u8 isr_tx_rdy_mask;
+ unsigned int rx_enable;
};
struct ipoctal {
struct ipack_device *dev;
unsigned int board_id;
struct ipoctal_channel channel[NR_CHANNELS];
- unsigned char write;
struct tty_driver *tty_drv;
u8 __iomem *mem8_space;
u8 __iomem *int_space;
channel = dev_get_drvdata(tty->dev);
+ /*
+ * Enable RX. TX will be enabled when
+ * there is something to send
+ */
iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+ channel->rx_enable = 1;
return 0;
}
static int ipoctal_open(struct tty_struct *tty, struct file *file)
{
- int res;
struct ipoctal_channel *channel;
channel = dev_get_drvdata(tty->dev);
-
- if (atomic_read(&channel->open))
- return -EBUSY;
-
tty->driver_data = channel;
- res = tty_port_open(&channel->tty_port, tty, file);
- if (res)
- return res;
-
- atomic_inc(&channel->open);
- return 0;
+ return tty_port_open(&channel->tty_port, tty, file);
}
static void ipoctal_reset_stats(struct ipoctal_stats *stats)
struct ipoctal_channel *channel = tty->driver_data;
tty_port_close(&channel->tty_port, tty, filp);
-
- if (atomic_dec_and_test(&channel->open))
- ipoctal_free_channel(channel);
+ ipoctal_free_channel(channel);
}
static int ipoctal_get_icount(struct tty_struct *tty,
struct tty_struct *tty, u8 sr)
{
unsigned char value;
- unsigned char flag = TTY_NORMAL;
+ unsigned char flag;
u8 isr;
do {
value = ioread8(&channel->regs->r.rhr);
+ flag = TTY_NORMAL;
/* Error: count statistics */
if (sr & SR_ERROR) {
iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
unsigned char value;
unsigned int *pointer_write = &channel->pointer_write;
- if (channel->nb_bytes <= 0) {
- channel->nb_bytes = 0;
+ if (channel->nb_bytes == 0)
return;
- }
value = channel->tty_port.xmit_buf[*pointer_write];
iowrite8(value, &channel->regs->w.thr);
(*pointer_write)++;
*pointer_write = *pointer_write % PAGE_SIZE;
channel->nb_bytes--;
-
- if ((channel->nb_bytes == 0) &&
- (waitqueue_active(&channel->queue))) {
-
- if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
- *channel->board_write = 1;
- wake_up_interruptible(&channel->queue);
- }
- }
}
static void ipoctal_irq_channel(struct ipoctal_channel *channel)
u8 isr, sr;
struct tty_struct *tty;
- /* If there is no client, skip the check */
- if (!atomic_read(&channel->open))
- return;
-
tty = tty_port_tty_get(&channel->tty_port);
if (!tty)
return;
+
+ spin_lock(&channel->lock);
/* The HW is organized in pair of channels. See which register we need
* to read from */
isr = ioread8(&channel->block_regs->r.isr);
sr = ioread8(&channel->regs->r.sr);
- /* In case of RS-485, change from TX to RX when finishing TX.
- * Half-duplex. */
- if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
- (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
+ if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
- iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
- iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
- *channel->board_write = 1;
- wake_up_interruptible(&channel->queue);
+ /* In case of RS-485, change from TX to RX when finishing TX.
+ * Half-duplex. */
+ if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
+ iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
+ iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+ }
}
/* RX data */
if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
ipoctal_irq_tx(channel);
- tty_flip_buffer_push(tty);
tty_kref_put(tty);
+ spin_unlock(&channel->lock);
}
static irqreturn_t ipoctal_irq_handler(void *arg)
unsigned int i;
struct ipoctal *ipoctal = (struct ipoctal *) arg;
- /* Check all channels */
- for (i = 0; i < NR_CHANNELS; i++)
- ipoctal_irq_channel(&ipoctal->channel[i]);
-
/* Clear the IPack device interrupt */
readw(ipoctal->int_space + ACK_INT_REQ0);
readw(ipoctal->int_space + ACK_INT_REQ1);
+ /* Check all channels */
+ for (i = 0; i < NR_CHANNELS; i++)
+ ipoctal_irq_channel(&ipoctal->channel[i]);
+
return IRQ_HANDLED;
}
struct ipoctal_channel *channel = &ipoctal->channel[i];
channel->regs = chan_regs + i;
channel->block_regs = block_regs + (i >> 1);
- channel->board_write = &ipoctal->write;
channel->board_id = ipoctal->board_id;
if (i & 1) {
channel->isr_tx_rdy_mask = ISR_TxRDY_B;
}
iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
ipoctal_reset_stats(&channel->stats);
channel->nb_bytes = 0;
- init_waitqueue_head(&channel->queue);
-
spin_lock_init(&channel->lock);
channel->pointer_read = 0;
channel->pointer_write = 0;
continue;
}
dev_set_drvdata(tty_dev, channel);
-
- /*
- * Enable again the RX. TX will be enabled when
- * there is something to send
- */
- iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
}
return 0;
/* As the IP-OCTAL 485 only supports half duplex, do it manually */
if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
}
* operations
*/
iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
- wait_event_interruptible(channel->queue, *channel->board_write);
- iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
-
- *channel->board_write = 0;
return char_copied;
}
iowrite8(mr2, &channel->regs->w.mr);
iowrite8(csr, &channel->regs->w.csr);
- /* Enable again the RX */
- iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+ /* Enable again the RX, if it was before */
+ if (channel->rx_enable)
+ iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
}
static void ipoctal_hangup(struct tty_struct *tty)
tty_port_hangup(&channel->tty_port);
iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+ channel->rx_enable = 0;
iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
projects / karo-tx-linux.git / blobdiff