static int sync_serial_open(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
int ret = -EBUSY;
sync_port *port;
reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
lock_kernel();
DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
{
DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
ret = -ENODEV;
goto out;
}
port = &ports[dev];
/* Allow open this device twice (assuming one reader and one writer) */
if (port->busy == 2)
{
DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
goto out;
}
if (port->init_irqs) {
if (port->use_dma) {
if (port == &ports[0]) {
#ifdef SYNC_SER_DMA
if (request_irq(DMA_OUT_INTR_VECT,
tr_interrupt,
0,
"synchronous serial 0 dma tr",
&ports[0])) {
printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
goto out;
} else if (request_irq(DMA_IN_INTR_VECT,
rx_interrupt,
0,
"synchronous serial 1 dma rx",
&ports[0])) {
free_irq(DMA_OUT_INTR_VECT, &port[0]);
printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
goto out;
} else if (crisv32_request_dma(OUT_DMA_NBR,
"synchronous serial 0 dma tr",
DMA_VERBOSE_ON_ERROR,
0,
REQ_DMA_SYNCSER)) {
free_irq(DMA_OUT_INTR_VECT, &port[0]);
free_irq(DMA_IN_INTR_VECT, &port[0]);
printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
goto out;
} else if (crisv32_request_dma(IN_DMA_NBR,
"synchronous serial 0 dma rec",
DMA_VERBOSE_ON_ERROR,
0,
REQ_DMA_SYNCSER)) {
crisv32_free_dma(OUT_DMA_NBR);
free_irq(DMA_OUT_INTR_VECT, &port[0]);
free_irq(DMA_IN_INTR_VECT, &port[0]);
printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
goto out;
}
#endif
}
#ifdef CONFIG_ETRAXFS
else if (port == &ports[1]) {
#ifdef SYNC_SER_DMA
if (request_irq(DMA6_INTR_VECT,
tr_interrupt,
0,
"synchronous serial 1 dma tr",
&ports[1])) {
printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
goto out;
} else if (request_irq(DMA7_INTR_VECT,
rx_interrupt,
0,
"synchronous serial 1 dma rx",
&ports[1])) {
free_irq(DMA6_INTR_VECT, &ports[1]);
printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
goto out;
} else if (crisv32_request_dma(
SYNC_SER1_TX_DMA_NBR,
"synchronous serial 1 dma tr",
DMA_VERBOSE_ON_ERROR,
0,
dma_sser1)) {
free_irq(DMA6_INTR_VECT, &ports[1]);
free_irq(DMA7_INTR_VECT, &ports[1]);
printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
goto out;
} else if (crisv32_request_dma(
SYNC_SER1_RX_DMA_NBR,
"synchronous serial 3 dma rec",
DMA_VERBOSE_ON_ERROR,
0,
dma_sser1)) {
crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
free_irq(DMA6_INTR_VECT, &ports[1]);
free_irq(DMA7_INTR_VECT, &ports[1]);
printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
goto out;
}
#endif
}
#endif
/* Enable DMAs */
REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
/* Enable DMA IRQs */
REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
/* Set up wordsize = 1 for DMAs. */
DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
start_dma_in(port);
port->init_irqs = 0;
} else { /* !port->use_dma */
#ifdef SYNC_SER_MANUAL
if (port == &ports[0]) {
if (request_irq(SYNCSER_INTR_VECT,
manual_interrupt,
0,
"synchronous serial manual irq",
&ports[0])) {
printk("Can't allocate sync serial manual irq");
goto out;
}
}
#ifdef CONFIG_ETRAXFS
else if (port == &ports[1]) {
if (request_irq(SSER1_INTR_VECT,
manual_interrupt,
0,
"synchronous serial manual irq",
&ports[1])) {
printk(KERN_CRIT "Can't allocate sync serial manual irq");
goto out;
}
}
#endif
port->init_irqs = 0;
#else
panic("sync_serial: Manual mode not supported.\n");
#endif /* SYNC_SER_MANUAL */
}
} /* port->init_irqs */
port->busy++;
ret = 0;
out:
unlock_kernel();
return ret;
}
static int sync_serial_open(struct inode *inode, struct file *file)
{
int ret = 0;
int dev = iminor(inode);
struct sync_port *port;
#ifdef SYNC_SER_DMA
reg_dma_rw_cfg cfg = { .en = regk_dma_yes };
reg_dma_rw_intr_mask intr_mask = { .data = regk_dma_yes };
#endif
DEBUG(pr_debug("Open sync serial port %d\n", dev));
if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
DEBUG(pr_info("Invalid minor %d\n", dev));
return -ENODEV;
}
port = &ports[dev];
/* Allow open this device twice (assuming one reader and one writer) */
if (port->busy == 2) {
DEBUG(pr_info("syncser%d is busy\n", dev));
return -EBUSY;
}
mutex_lock(&sync_serial_mutex);
/* Clear any stale date left in the flip buffer */
port->readp = port->writep = port->flip;
port->in_buffer_len = 0;
port->read_ts_idx = 0;
port->write_ts_idx = 0;
if (port->init_irqs != no_irq_setup) {
/* Init only on first call. */
port->busy++;
mutex_unlock(&sync_serial_mutex);
return 0;
}
if (port->use_dma) {
#ifdef SYNC_SER_DMA
const char *tmp;
DEBUG(pr_info("Using DMA for syncser%d\n", dev));
tmp = dev == 0 ? "syncser0 tx" : "syncser1 tx";
if (request_irq(port->dma_out_intr_vect, tr_interrupt, 0,
tmp, port)) {
pr_err("Can't alloc syncser%d TX IRQ", dev);
ret = -EBUSY;
goto unlock_and_exit;
}
if (artpec_request_dma(port->dma_out_nbr, tmp,
DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) {
free_irq(port->dma_out_intr_vect, port);
pr_err("Can't alloc syncser%d TX DMA", dev);
ret = -EBUSY;
goto unlock_and_exit;
}
tmp = dev == 0 ? "syncser0 rx" : "syncser1 rx";
if (request_irq(port->dma_in_intr_vect, rx_interrupt, 0,
tmp, port)) {
artpec_free_dma(port->dma_out_nbr);
free_irq(port->dma_out_intr_vect, port);
pr_err("Can't alloc syncser%d RX IRQ", dev);
ret = -EBUSY;
goto unlock_and_exit;
}
if (artpec_request_dma(port->dma_in_nbr, tmp,
DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) {
artpec_free_dma(port->dma_out_nbr);
free_irq(port->dma_out_intr_vect, port);
free_irq(port->dma_in_intr_vect, port);
pr_err("Can't alloc syncser%d RX DMA", dev);
ret = -EBUSY;
goto unlock_and_exit;
}
/* Enable DMAs */
REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
/* Enable DMA IRQs */
REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
/* Set up wordsize = 1 for DMAs. */
DMA_WR_CMD(port->regi_dmain, regk_dma_set_w_size1);
DMA_WR_CMD(port->regi_dmaout, regk_dma_set_w_size1);
start_dma_in(port);
port->init_irqs = dma_irq_setup;
#endif
} else { /* !port->use_dma */
#ifdef SYNC_SER_MANUAL
const char *tmp = dev == 0 ? "syncser0 manual irq" :
"syncser1 manual irq";
if (request_irq(port->syncser_intr_vect, manual_interrupt,
0, tmp, port)) {
pr_err("Can't alloc syncser%d manual irq",
dev);
ret = -EBUSY;
goto unlock_and_exit;
}
port->init_irqs = manual_irq_setup;
#else
panic("sync_serial: Manual mode not supported\n");
#endif /* SYNC_SER_MANUAL */
}
port->busy++;
ret = 0;
unlock_and_exit:
mutex_unlock(&sync_serial_mutex);
return ret;
}
