From 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Sun, 28 Sep 2008 13:01:01 +0200 Subject: mISDN: Add different different timer settings for hfc-pci - Poll-timer can now be set from 8 to 256 samples, depending on your kernel. - If default or 128 is used, the normal controller's clock is used as before. Usage: modprobe hfcpci poll=XXX - Added some debug code for dsp buffer size. (CMX_DELAY_DEBUG) Signed-off-by: Andreas Eversberg Signed-off-by: Karsten Keil --- drivers/isdn/hardware/mISDN/hfc_pci.h | 1 - drivers/isdn/hardware/mISDN/hfcpci.c | 152 ++++++++++++++++++++++++++++------ 2 files changed, 125 insertions(+), 28 deletions(-) (limited to 'drivers/isdn/hardware') diff --git a/drivers/isdn/hardware/mISDN/hfc_pci.h b/drivers/isdn/hardware/mISDN/hfc_pci.h index fd9241ab1802..3132ddc99fcd 100644 --- a/drivers/isdn/hardware/mISDN/hfc_pci.h +++ b/drivers/isdn/hardware/mISDN/hfc_pci.h @@ -26,7 +26,6 @@ * change mask and threshold simultaneously */ #define HFCPCI_BTRANS_THRESHOLD 128 -#define HFCPCI_BTRANS_MAX 256 #define HFCPCI_FILLEMPTY 64 #define HFCPCI_BTRANS_THRESMASK 0x00 diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c index ea69d5862f6d..cd5d26c9909f 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 @@ -36,10 +55,14 @@ static const char *hfcpci_revision = "2.0"; 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); +module_param(poll, uint, S_IRUGO | S_IWUSR); static LIST_HEAD(HFClist); static DEFINE_RWLOCK(HFClock); @@ -519,9 +542,9 @@ 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; @@ -533,17 +556,19 @@ 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); @@ -568,7 +593,6 @@ 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; } /* @@ -579,12 +603,11 @@ 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; @@ -624,9 +647,10 @@ 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; @@ -782,9 +806,9 @@ hfcpci_fill_fifo(struct bchannel *bch) 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 */ @@ -1164,37 +1188,37 @@ 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); @@ -1203,6 +1227,41 @@ hfcpci_int(int intno, void *dev_id) return IRQ_HANDLED; } +static void +hfcpci_softirq(void *arg) +{ + u_long flags; + struct bchannel *bch; + struct hfc_pci *hc; + + write_lock_irqsave(&HFClock, flags); + list_for_each_entry(hc, &HFClist, list) { + 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); + } + } + write_unlock_irqrestore(&HFClock, flags); + + /* 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); +} + /* * timer callback for D-chan busy resolution. Currently no function */ @@ -1312,14 +1371,16 @@ 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; } @@ -1427,7 +1488,8 @@ 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 @@ -1436,7 +1498,8 @@ 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 @@ -2273,7 +2336,39 @@ 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; } @@ -2282,6 +2377,9 @@ 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); } -- cgit v1.2.3