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path: root/drivers/isdn/hardware/mISDN/hfcpci.c
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Diffstat (limited to 'drivers/isdn/hardware/mISDN/hfcpci.c')
-rw-r--r--drivers/isdn/hardware/mISDN/hfcpci.c241
1 files changed, 186 insertions, 55 deletions
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index cd8302af40eb..f0e14dfcf71d 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -23,6 +23,25 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
+ * Module options:
+ *
+ * debug:
+ * NOTE: only one poll value must be given for all cards
+ * See hfc_pci.h for debug flags.
+ *
+ * poll:
+ * NOTE: only one poll value must be given for all cards
+ * Give the number of samples for each fifo process.
+ * By default 128 is used. Decrease to reduce delay, increase to
+ * reduce cpu load. If unsure, don't mess with it!
+ * A value of 128 will use controller's interrupt. Other values will
+ * use kernel timer, because the controller will not allow lower values
+ * than 128.
+ * Also note that the value depends on the kernel timer frequency.
+ * If kernel uses a frequency of 1000 Hz, steps of 8 samples are possible.
+ * If the kernel uses 100 Hz, steps of 80 samples are possible.
+ * If the kernel uses 300 Hz, steps of about 26 samples are possible.
+ *
*/
#include <linux/module.h>
@@ -34,16 +53,16 @@
static const char *hfcpci_revision = "2.0";
-#define MAX_CARDS 8
static int HFC_cnt;
static uint debug;
+static uint poll, tics;
+struct timer_list hfc_tl;
+u32 hfc_jiffies;
MODULE_AUTHOR("Karsten Keil");
MODULE_LICENSE("GPL");
-module_param(debug, uint, 0);
-
-static LIST_HEAD(HFClist);
-static DEFINE_RWLOCK(HFClock);
+module_param(debug, uint, S_IRUGO | S_IWUSR);
+module_param(poll, uint, S_IRUGO | S_IWUSR);
enum {
HFC_CCD_2BD0,
@@ -114,7 +133,6 @@ struct hfcPCI_hw {
struct hfc_pci {
- struct list_head list;
u_char subtype;
u_char chanlimit;
u_char initdone;
@@ -520,9 +538,9 @@ receive_dmsg(struct hfc_pci *hc)
}
/*
- * check for transparent receive data and read max one threshold size if avail
+ * check for transparent receive data and read max one 'poll' size if avail
*/
-static int
+static void
hfcpci_empty_fifo_trans(struct bchannel *bch, struct bzfifo *bz, u_char *bdata)
{
__le16 *z1r, *z2r;
@@ -534,17 +552,19 @@ hfcpci_empty_fifo_trans(struct bchannel *bch, struct bzfifo *bz, u_char *bdata)
fcnt = le16_to_cpu(*z1r) - le16_to_cpu(*z2r);
if (!fcnt)
- return 0; /* no data avail */
+ return; /* no data avail */
if (fcnt <= 0)
fcnt += B_FIFO_SIZE; /* bytes actually buffered */
- if (fcnt > HFCPCI_BTRANS_THRESHOLD)
- fcnt = HFCPCI_BTRANS_THRESHOLD; /* limit size */
-
new_z2 = le16_to_cpu(*z2r) + fcnt; /* new position in fifo */
if (new_z2 >= (B_FIFO_SIZE + B_SUB_VAL))
new_z2 -= B_FIFO_SIZE; /* buffer wrap */
+ if (fcnt > MAX_DATA_SIZE) { /* flush, if oversized */
+ *z2r = cpu_to_le16(new_z2); /* new position */
+ return;
+ }
+
bch->rx_skb = mI_alloc_skb(fcnt, GFP_ATOMIC);
if (bch->rx_skb) {
ptr = skb_put(bch->rx_skb, fcnt);
@@ -569,7 +589,6 @@ hfcpci_empty_fifo_trans(struct bchannel *bch, struct bzfifo *bz, u_char *bdata)
printk(KERN_WARNING "HFCPCI: receive out of memory\n");
*z2r = cpu_to_le16(new_z2); /* new position */
- return 1;
}
/*
@@ -580,12 +599,11 @@ main_rec_hfcpci(struct bchannel *bch)
{
struct hfc_pci *hc = bch->hw;
int rcnt, real_fifo;
- int receive, count = 5;
+ int receive = 0, count = 5;
struct bzfifo *bz;
u_char *bdata;
struct zt *zp;
-
if ((bch->nr & 2) && (!hc->hw.bswapped)) {
bz = &((union fifo_area *)(hc->hw.fifos))->b_chans.rxbz_b2;
bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.rxdat_b2;
@@ -625,9 +643,10 @@ Begin:
receive = 1;
else
receive = 0;
- } else if (test_bit(FLG_TRANSPARENT, &bch->Flags))
- receive = hfcpci_empty_fifo_trans(bch, bz, bdata);
- else
+ } else if (test_bit(FLG_TRANSPARENT, &bch->Flags)) {
+ hfcpci_empty_fifo_trans(bch, bz, bdata);
+ return;
+ } else
receive = 0;
if (count && receive)
goto Begin;
@@ -751,11 +770,41 @@ hfcpci_fill_fifo(struct bchannel *bch)
/* fcnt contains available bytes in fifo */
fcnt = B_FIFO_SIZE - fcnt;
/* remaining bytes to send (bytes in fifo) */
+
+ /* "fill fifo if empty" feature */
+ if (test_bit(FLG_FILLEMPTY, &bch->Flags) && !fcnt) {
+ /* printk(KERN_DEBUG "%s: buffer empty, so we have "
+ "underrun\n", __func__); */
+ /* fill buffer, to prevent future underrun */
+ count = HFCPCI_FILLEMPTY;
+ new_z1 = le16_to_cpu(*z1t) + count;
+ /* new buffer Position */
+ if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
+ new_z1 -= B_FIFO_SIZE; /* buffer wrap */
+ dst = bdata + (le16_to_cpu(*z1t) - B_SUB_VAL);
+ maxlen = (B_FIFO_SIZE + B_SUB_VAL) - le16_to_cpu(*z1t);
+ /* end of fifo */
+ if (bch->debug & DEBUG_HW_BFIFO)
+ printk(KERN_DEBUG "hfcpci_FFt fillempty "
+ "fcnt(%d) maxl(%d) nz1(%x) dst(%p)\n",
+ fcnt, maxlen, new_z1, dst);
+ fcnt += count;
+ if (maxlen > count)
+ maxlen = count; /* limit size */
+ memset(dst, 0x2a, maxlen); /* first copy */
+ count -= maxlen; /* remaining bytes */
+ if (count) {
+ dst = bdata; /* start of buffer */
+ memset(dst, 0x2a, count);
+ }
+ *z1t = cpu_to_le16(new_z1); /* now send data */
+ }
+
next_t_frame:
count = bch->tx_skb->len - bch->tx_idx;
- /* maximum fill shall be HFCPCI_BTRANS_MAX */
- if (count > HFCPCI_BTRANS_MAX - fcnt)
- count = HFCPCI_BTRANS_MAX - fcnt;
+ /* maximum fill shall be poll*2 */
+ if (count > (poll << 1) - fcnt)
+ count = (poll << 1) - fcnt;
if (count <= 0)
return;
/* data is suitable for fifo */
@@ -1135,37 +1184,37 @@ hfcpci_int(int intno, void *dev_id)
val &= ~0x80;
Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt | HFCPCI_CLTIMER);
}
- if (val & 0x08) {
+ if (val & 0x08) { /* B1 rx */
bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
if (bch)
main_rec_hfcpci(bch);
else if (hc->dch.debug)
printk(KERN_DEBUG "hfcpci spurious 0x08 IRQ\n");
}
- if (val & 0x10) {
+ if (val & 0x10) { /* B2 rx */
bch = Sel_BCS(hc, 2);
if (bch)
main_rec_hfcpci(bch);
else if (hc->dch.debug)
printk(KERN_DEBUG "hfcpci spurious 0x10 IRQ\n");
}
- if (val & 0x01) {
+ if (val & 0x01) { /* B1 tx */
bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
if (bch)
tx_birq(bch);
else if (hc->dch.debug)
printk(KERN_DEBUG "hfcpci spurious 0x01 IRQ\n");
}
- if (val & 0x02) {
+ if (val & 0x02) { /* B2 tx */
bch = Sel_BCS(hc, 2);
if (bch)
tx_birq(bch);
else if (hc->dch.debug)
printk(KERN_DEBUG "hfcpci spurious 0x02 IRQ\n");
}
- if (val & 0x20)
+ if (val & 0x20) /* D rx */
receive_dmsg(hc);
- if (val & 0x04) { /* dframe transmitted */
+ if (val & 0x04) { /* D tx */
if (test_and_clear_bit(FLG_BUSY_TIMER, &hc->dch.Flags))
del_timer(&hc->dch.timer);
tx_dirq(&hc->dch);
@@ -1283,14 +1332,16 @@ mode_hfcpci(struct bchannel *bch, int bc, int protocol)
}
if (fifo2 & 2) {
hc->hw.fifo_en |= HFCPCI_FIFOEN_B2;
- hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
- HFCPCI_INTS_B2REC);
+ if (!tics)
+ hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
+ HFCPCI_INTS_B2REC);
hc->hw.ctmt |= 2;
hc->hw.conn &= ~0x18;
} else {
hc->hw.fifo_en |= HFCPCI_FIFOEN_B1;
- hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
- HFCPCI_INTS_B1REC);
+ if (!tics)
+ hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
+ HFCPCI_INTS_B1REC);
hc->hw.ctmt |= 1;
hc->hw.conn &= ~0x03;
}
@@ -1398,7 +1449,8 @@ set_hfcpci_rxtest(struct bchannel *bch, int protocol, int chan)
if (chan & 2) {
hc->hw.sctrl_r |= SCTRL_B2_ENA;
hc->hw.fifo_en |= HFCPCI_FIFOEN_B2RX;
- hc->hw.int_m1 |= HFCPCI_INTS_B2REC;
+ if (!tics)
+ hc->hw.int_m1 |= HFCPCI_INTS_B2REC;
hc->hw.ctmt |= 2;
hc->hw.conn &= ~0x18;
#ifdef REVERSE_BITORDER
@@ -1407,7 +1459,8 @@ set_hfcpci_rxtest(struct bchannel *bch, int protocol, int chan)
} else {
hc->hw.sctrl_r |= SCTRL_B1_ENA;
hc->hw.fifo_en |= HFCPCI_FIFOEN_B1RX;
- hc->hw.int_m1 |= HFCPCI_INTS_B1REC;
+ if (!tics)
+ hc->hw.int_m1 |= HFCPCI_INTS_B1REC;
hc->hw.ctmt |= 1;
hc->hw.conn &= ~0x03;
#ifdef REVERSE_BITORDER
@@ -1481,11 +1534,17 @@ deactivate_bchannel(struct bchannel *bch)
static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
- int ret = 0;
+ int ret = 0;
switch (cq->op) {
case MISDN_CTRL_GETOP:
- cq->op = 0;
+ cq->op = MISDN_CTRL_FILL_EMPTY;
+ break;
+ case MISDN_CTRL_FILL_EMPTY: /* fill fifo, if empty */
+ test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
+ if (debug & DEBUG_HW_OPEN)
+ printk(KERN_DEBUG "%s: FILL_EMPTY request (nr=%d "
+ "off=%d)\n", __func__, bch->nr, !!cq->p1);
break;
default:
printk(KERN_WARNING "%s: unknown Op %x\n", __func__, cq->op);
@@ -1859,6 +1918,10 @@ open_dchannel(struct hfc_pci *hc, struct mISDNchannel *ch,
hc->dch.dev.id, __builtin_return_address(0));
if (rq->protocol == ISDN_P_NONE)
return -EINVAL;
+ if (rq->adr.channel == 1) {
+ /* TODO: E-Channel */
+ return -EINVAL;
+ }
if (!hc->initdone) {
if (rq->protocol == ISDN_P_TE_S0) {
err = create_l1(&hc->dch, hfc_l1callback);
@@ -1874,6 +1937,11 @@ open_dchannel(struct hfc_pci *hc, struct mISDNchannel *ch,
if (rq->protocol != ch->protocol) {
if (hc->hw.protocol == ISDN_P_TE_S0)
l1_event(hc->dch.l1, CLOSE_CHANNEL);
+ if (rq->protocol == ISDN_P_TE_S0) {
+ err = create_l1(&hc->dch, hfc_l1callback);
+ if (err)
+ return err;
+ }
hc->hw.protocol = rq->protocol;
ch->protocol = rq->protocol;
hfcpci_setmode(hc);
@@ -1903,6 +1971,7 @@ open_bchannel(struct hfc_pci *hc, struct channel_req *rq)
bch = &hc->bch[rq->adr.channel - 1];
if (test_and_set_bit(FLG_OPEN, &bch->Flags))
return -EBUSY; /* b-channel can be only open once */
+ test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
bch->ch.protocol = rq->protocol;
rq->ch = &bch->ch; /* TODO: E-channel */
if (!try_module_get(THIS_MODULE))
@@ -1928,7 +1997,8 @@ hfc_dctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
switch (cmd) {
case OPEN_CHANNEL:
rq = arg;
- if (rq->adr.channel == 0)
+ if ((rq->protocol == ISDN_P_TE_S0) ||
+ (rq->protocol == ISDN_P_NT_S0))
err = open_dchannel(hc, ch, rq);
else
err = open_bchannel(hc, rq);
@@ -2027,7 +2097,6 @@ release_card(struct hfc_pci *hc) {
mISDN_freebchannel(&hc->bch[1]);
mISDN_freebchannel(&hc->bch[0]);
mISDN_freedchannel(&hc->dch);
- list_del(&hc->list);
pci_set_drvdata(hc->pdev, NULL);
kfree(hc);
}
@@ -2037,12 +2106,8 @@ setup_card(struct hfc_pci *card)
{
int err = -EINVAL;
u_int i;
- u_long flags;
char name[MISDN_MAX_IDLEN];
- if (HFC_cnt >= MAX_CARDS)
- return -EINVAL; /* maybe better value */
-
card->dch.debug = debug;
spin_lock_init(&card->lock);
mISDN_initdchannel(&card->dch, MAX_DFRAME_LEN_L1, ph_state);
@@ -2068,13 +2133,10 @@ setup_card(struct hfc_pci *card)
if (err)
goto error;
snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-pci.%d", HFC_cnt + 1);
- err = mISDN_register_device(&card->dch.dev, name);
+ err = mISDN_register_device(&card->dch.dev, &card->pdev->dev, name);
if (err)
goto error;
HFC_cnt++;
- write_lock_irqsave(&HFClock, flags);
- list_add_tail(&card->list, &HFClist);
- write_unlock_irqrestore(&HFClock, flags);
printk(KERN_INFO "HFC %d cards installed\n", HFC_cnt);
return 0;
error:
@@ -2210,15 +2272,12 @@ static void __devexit
hfc_remove_pci(struct pci_dev *pdev)
{
struct hfc_pci *card = pci_get_drvdata(pdev);
- u_long flags;
- if (card) {
- write_lock_irqsave(&HFClock, flags);
+ if (card)
release_card(card);
- write_unlock_irqrestore(&HFClock, flags);
- } else
+ else
if (debug)
- printk(KERN_WARNING "%s: drvdata allready removed\n",
+ printk(KERN_WARNING "%s: drvdata already removed\n",
__func__);
}
@@ -2230,25 +2289,97 @@ static struct pci_driver hfc_driver = {
.id_table = hfc_ids,
};
+static int
+_hfcpci_softirq(struct device *dev, void *arg)
+{
+ struct hfc_pci *hc = dev_get_drvdata(dev);
+ struct bchannel *bch;
+ if (hc == NULL)
+ return 0;
+
+ if (hc->hw.int_m2 & HFCPCI_IRQ_ENABLE) {
+ spin_lock(&hc->lock);
+ bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
+ if (bch && bch->state == ISDN_P_B_RAW) { /* B1 rx&tx */
+ main_rec_hfcpci(bch);
+ tx_birq(bch);
+ }
+ bch = Sel_BCS(hc, hc->hw.bswapped ? 1 : 2);
+ if (bch && bch->state == ISDN_P_B_RAW) { /* B2 rx&tx */
+ main_rec_hfcpci(bch);
+ tx_birq(bch);
+ }
+ spin_unlock(&hc->lock);
+ }
+ return 0;
+}
+
+static void
+hfcpci_softirq(void *arg)
+{
+ (void) driver_for_each_device(&hfc_driver.driver, NULL, arg,
+ _hfcpci_softirq);
+
+ /* if next event would be in the past ... */
+ if ((s32)(hfc_jiffies + tics - jiffies) <= 0)
+ hfc_jiffies = jiffies + 1;
+ else
+ hfc_jiffies += tics;
+ hfc_tl.expires = hfc_jiffies;
+ add_timer(&hfc_tl);
+}
+
static int __init
HFC_init(void)
{
int err;
+ if (!poll)
+ poll = HFCPCI_BTRANS_THRESHOLD;
+
+ if (poll != HFCPCI_BTRANS_THRESHOLD) {
+ tics = (poll * HZ) / 8000;
+ if (tics < 1)
+ tics = 1;
+ poll = (tics * 8000) / HZ;
+ if (poll > 256 || poll < 8) {
+ printk(KERN_ERR "%s: Wrong poll value %d not in range "
+ "of 8..256.\n", __func__, poll);
+ err = -EINVAL;
+ return err;
+ }
+ }
+ if (poll != HFCPCI_BTRANS_THRESHOLD) {
+ printk(KERN_INFO "%s: Using alternative poll value of %d\n",
+ __func__, poll);
+ hfc_tl.function = (void *)hfcpci_softirq;
+ hfc_tl.data = 0;
+ init_timer(&hfc_tl);
+ hfc_tl.expires = jiffies + tics;
+ hfc_jiffies = hfc_tl.expires;
+ add_timer(&hfc_tl);
+ } else
+ tics = 0; /* indicate the use of controller's timer */
+
err = pci_register_driver(&hfc_driver);
+ if (err) {
+ if (timer_pending(&hfc_tl))
+ del_timer(&hfc_tl);
+ }
+
return err;
}
static void __exit
HFC_cleanup(void)
{
- struct hfc_pci *card, *next;
+ if (timer_pending(&hfc_tl))
+ del_timer(&hfc_tl);
- list_for_each_entry_safe(card, next, &HFClist, list) {
- release_card(card);
- }
pci_unregister_driver(&hfc_driver);
}
module_init(HFC_init);
module_exit(HFC_cleanup);
+
+MODULE_DEVICE_TABLE(pci, hfc_ids);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 12:15:48 +0000