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freebsd/sys/i386/isa/if_sr.c
Joerg Wunsch 00081cc989 Major overhaul of the SyncPPP layer. Basically, this comprises now a 
full implementation of the sate machine as described in RFC1661, and
provides support for plugging in various control protocols.  I needed
this to provide PPP support for the BISDN project (right now).

Unfortunatley, while the existing API was almost up to the point, i
needed one minor API change in order to decouple the this-layer-
started and this-layer-finished actions from the respective Up and
Down events of the lower layer.  This requires two additional lines in
the attach routines of all existing lower layer interface drivers that
are using syncPPP (shortcutting these actions and events).  Apart from
this, i believe i didn't change the API of all this, so everything
should plug in without too many hassles.  Please report if i broke
something in the existing drivers.

For a list of features (including new ones like dial-on-demand), and
things still to be done, please refer to the man page i'll commit asap.

Encouraged by:	Serge Vakulenko <vak@cronyx.ru>
1997-05-19 22:03:09 +00:00

2949 lines
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/*
* Copyright (c) 1996 John Hay.
* Copyright (c) 1996 SDL Communications, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: if_sr.c,v 1.6 1997/02/22 09:36:35 peter Exp $
*/
/*
* Programming assumptions and other issues.
*
* Only a 16K window will be used.
*
* The descriptors of a DMA channel will fit in a 16K memory window.
*
* The buffers of a transmit DMA channel will fit in a 16K memory window.
*
* When interface is going up, handshaking is set and it is only cleared
* when the interface is down'ed.
*
* There should be a way to set/reset Raw HDLC/PPP, Loopback, DCE/DTE,
* internal/external clock, etc.....
*
*/
#include "sr.h"
#ifdef notyet
#include "fr.h"
#else
#define NFR 0
#endif
#include "pci.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_sppp.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <machine/md_var.h>
#include <i386/isa/if_srregs.h>
#include <i386/isa/ic/hd64570.h>
#include "ioconf.h"
/* #define USE_MODEMCK */
#ifndef BUGGY
#define BUGGY 0
#endif
#define PPP_HEADER_LEN 4
/*
* These macros are used to hide the difference between the way the
* ISA N2 cards and the PCI N2 cards access the Hitachi 64570 SCA.
*/
#define SRC_GET8(base,off) (*hc->src_get8)(base,(u_int)&off)
#define SRC_GET16(base,off) (*hc->src_get16)(base,(u_int)&off)
#define SRC_PUT8(base,off,d) (*hc->src_put8)(base,(u_int)&off,d)
#define SRC_PUT16(base,off,d) (*hc->src_put16)(base,(u_int)&off,d)
/*
* These macros enable/disable the DPRAM and select the correct
* DPRAM page.
*/
#define SRC_GET_WIN(addr) ((addr >> SRC_WIN_SHFT) & SR_PG_MSK)
#define SRC_SET_ON(iobase) outb(iobase+SR_PCR, \
SR_PCR_MEM_WIN | inb(iobase+SR_PCR))
#define SRC_SET_MEM(iobase,win) outb(iobase+SR_PSR, SRC_GET_WIN(win) | \
(inb(iobase+SR_PSR) & ~SR_PG_MSK))
#define SRC_SET_OFF(iobase) outb(iobase+SR_PCR, \
~SR_PCR_MEM_WIN & inb(iobase+SR_PCR))
/*
* Define the hardware (card information) structure needed to keep
* track of the device itself... There is only one per card.
*/
struct sr_hardc {
struct sr_hardc *next; /* PCI card linkage */
struct sr_softc *sc; /* software channels */
int cunit; /* card w/in system */
u_short iobase; /* I/O Base Address */
int cardtype;
int numports; /* # of ports on cd */
int mempages;
u_int memsize; /* DPRAM size: bytes */
u_int winmsk;
vm_offset_t sca_base;
vm_offset_t mem_pstart; /* start of buffer */
caddr_t mem_start; /* start of DP RAM */
caddr_t mem_end; /* end of DP RAM */
caddr_t plx_base;
sca_regs *sca; /* register array */
/*
* We vectorize the following functions to allow re-use between the
* ISA card's needs and those of the PCI card.
*/
void (*src_put8)(u_int base, u_int off, u_int val);
void (*src_put16)(u_int base, u_int off, u_int val);
u_int (*src_get8)(u_int base, u_int off);
u_int (*src_get16)(u_int base, u_int off);
};
static int next_sc_unit = 0;
static int sr_watcher = 0;
static struct sr_hardc sr_hardc[NSR];
static struct sr_hardc *sr_hardc_pci;
/*
* Define the software interface for the card... There is one for
* every channel (port).
*/
struct sr_softc {
struct sppp ifsppp; /* PPP service w/in system */
struct sr_hardc *hc; /* card-level information */
int unit; /* With regard to all sr devices */
int subunit; /* With regard to this card */
int attached; /* attached to FR or PPP */
int protocol; /* FR or PPP */
#define N2_USE_FRP 2 /* Frame Relay Protocol */
#define N2_USE_PPP 1 /* Point-to-Point Protocol */
struct buf_block {
u_int txdesc; /* DPRAM offset */
u_int txstart;/* DPRAM offset */
u_int txend; /* DPRAM offset */
u_int txtail; /* # of 1st free gran */
u_int txmax; /* # of free grans */
u_int txeda; /* err descr addr */
} block[SR_TX_BLOCKS];
char xmit_busy; /* Transmitter is busy */
char txb_inuse; /* # of tx grans in use */
u_int txb_new; /* ndx to new buffer */
u_int txb_next_tx; /* ndx to next gran rdy tx */
u_int rxdesc; /* DPRAM offset */
u_int rxstart; /* DPRAM offset */
u_int rxend; /* DPRAM offset */
u_int rxhind; /* ndx to the hd of rx bufrs */
u_int rxmax; /* # of avail grans */
u_int clk_cfg; /* Clock configuration */
int scachan; /* channel # on card */
};
/*
* List of valid interrupt numbers for the N2 ISA card.
*/
static int sr_irqtable[16] = {
0, /* 0 */
0, /* 1 */
0, /* 2 */
1, /* 3 */
1, /* 4 */
1, /* 5 */
0, /* 6 */
1, /* 7 */
0, /* 8 */
0, /* 9 */
1, /* 10 */
1, /* 11 */
1, /* 12 */
0, /* 13 */
0, /* 14 */
1 /* 15 */
};
static int srprobe(struct isa_device *id);
static int srattach_isa(struct isa_device *id);
struct isa_driver srdriver = {srprobe, srattach_isa, "src"};
/*
* Baud Rate table for Sync Mode.
* Each entry consists of 3 elements:
* Baud Rate (x100) , TMC, BR
*
* Baud Rate = FCLK / TMC / 2^BR
* Baud table for Crystal freq. of 9.8304 Mhz
*/
#ifdef N2_TEST_SPEED
struct rate_line {
int target; /* target rate/100 */
int tmc_reg; /* TMC register value */
int br_reg; /* BR (BaudRateClk) selector */
} n2_rates[] = {
/* Baudx100 TMC BR */
{ 3, 128, 8 },
{ 6, 128, 7 },
{ 12, 128, 6 },
{ 24, 128, 5 },
{ 48, 128, 4 },
{ 96, 128, 3 },
{ 192, 128, 2 },
{ 384, 128, 1 },
{ 560, 88, 1 },
{ 640, 77, 1 },
{ 1280, 38, 1 },
{ 2560, 19, 1 },
{ 5120, 10, 1 },
{ 10000, 5, 1 },
{ 15000, 3, 1 },
{ 25000, 2, 1 },
{ 50000, 1, 1 },
{ 0, 0, 0 }
};
int sr_test_speed[] = {
N2_TEST_SPEED,
N2_TEST_SPEED
};
int etc0vals[] = {
SR_MCR_ETC0, /* ISA channel 0 */
SR_MCR_ETC1, /* ISA channel 1 */
SR_FECR_ETC0, /* PCI channel 0 */
SR_FECR_ETC1 /* PCI channel 1 */
};
#endif
struct sr_hardc *srattach_pci(int unit, vm_offset_t plx_vaddr,
vm_offset_t sca_vaddr);
void srintr_hc(struct sr_hardc *hc);
static int srattach(struct sr_hardc *hc);
static void sr_xmit(struct sr_softc *sc);
static void srstart(struct ifnet *ifp);
static int srioctl(struct ifnet *ifp, int cmd, caddr_t data);
static void srwatchdog(struct ifnet *ifp);
static int sr_packet_avail(struct sr_softc *sc, int *len, u_char *rxstat);
static void sr_copy_rxbuf(struct mbuf *m, struct sr_softc *sc, int len);
static void sr_eat_packet(struct sr_softc *sc, int single);
static void sr_get_packets(struct sr_softc *sc);
static void sr_up(struct sr_softc *sc);
static void sr_down(struct sr_softc *sc);
static void src_init(struct sr_hardc *hc);
static void sr_init_sca(struct sr_hardc *hc);
static void sr_init_msci(struct sr_softc *sc);
static void sr_init_rx_dmac(struct sr_softc *sc);
static void sr_init_tx_dmac(struct sr_softc *sc);
static void sr_dmac_intr(struct sr_hardc *hc, u_char isr);
static void sr_msci_intr(struct sr_hardc *hc, u_char isr);
static void sr_timer_intr(struct sr_hardc *hc, u_char isr);
static void sr_modemck(void *x);
static u_int src_get8_io(u_int base, u_int off);
static u_int src_get16_io(u_int base, u_int off);
static void src_put8_io(u_int base, u_int off, u_int val);
static void src_put16_io(u_int base, u_int off, u_int val);
static u_int src_get8_mem(u_int base, u_int off);
static u_int src_get16_mem(u_int base, u_int off);
static void src_put8_mem(u_int base, u_int off, u_int val);
static void src_put16_mem(u_int base, u_int off, u_int val);
#if NFR > 0
extern void fr_detach(struct ifnet *);
extern int fr_attach(struct ifnet *);
extern int fr_ioctl(struct ifnet *, int, caddr_t);
extern void fr_flush(struct ifnet *);
extern int fr_input(struct ifnet *, struct mbuf *);
extern struct mbuf *fr_dequeue(struct ifnet *);
#endif
/*
* I/O for ISA N2 card(s)
*/
#define SRC_REG(iobase,y) ((((y) & 0xf) + (((y) & 0xf0) << 6) + \
(iobase)) | 0x8000)
static u_int
src_get8_io(u_int base, u_int off)
{
return inb(SRC_REG(base, off));
}
static u_int
src_get16_io(u_int base, u_int off)
{
return inw(SRC_REG(base, off));
}
static void
src_put8_io(u_int base, u_int off, u_int val)
{
outb(SRC_REG(base, off), val);
}
static void
src_put16_io(u_int base, u_int off, u_int val)
{
outw(SRC_REG(base, off), val);
}
/*
* I/O for PCI N2 card(s)
*/
#define SRC_PCI_SCA_REG(y) ((y & 2) ? ((y & 0xfd) + 0x100) : y)
static u_int
src_get8_mem(u_int base, u_int off)
{
return *((u_char *)(base + SRC_PCI_SCA_REG(off)));
}
static u_int
src_get16_mem(u_int base, u_int off)
{
return *((u_short *)(base + SRC_PCI_SCA_REG(off)));
}
static void
src_put8_mem(u_int base, u_int off, u_int val)
{
*((u_char *)(base + SRC_PCI_SCA_REG(off))) = (u_char)val;
}
static void
src_put16_mem(u_int base, u_int off, u_int val)
{
*((u_short *)(base + SRC_PCI_SCA_REG(off))) = (u_short)val;
}
/*
* Probe for an ISA card. If it is there, size its memory. Then get the
* rest of its information and fill it in.
*/
static int
srprobe(struct isa_device *id)
{
struct sr_hardc *hc = &sr_hardc[id->id_unit];
u_int pgs, i, tmp;
u_short port;
u_short *smem;
u_char mar;
sca_regs *sca = 0;
/*
* Now see if the card is realy there.
*/
hc->cardtype = SR_CRD_N2;
/*
* We have to fill these in early because the SRC_PUT* and SRC_GET*
* macros use them.
*/
hc->src_get8 = src_get8_io;
hc->src_get16 = src_get16_io;
hc->src_put8 = src_put8_io;
hc->src_put16 = src_put16_io;
hc->sca = 0;
port = id->id_iobase;
hc->numports = NCHAN; /* assumed # of channels on the card */
if (id->id_flags & SR_FLAGS_NCHAN_MSK)
hc->numports = id->id_flags & SR_FLAGS_NCHAN_MSK;
outb(port + SR_PCR, 0); /* turn off the card */
/*
* Next, we'll test the Base Address Register to retension of
* data... ... seeing if we're *really* talking to an N2.
*/
for (i = 0; i < 0x100; i++) {
outb(port + SR_BAR, i);
inb(port + SR_PCR);
tmp = inb(port + SR_BAR);
if (tmp != i) {
printf("sr%d: probe failed BAR %x, %x.\n",
id->id_unit, i, tmp);
return 0;
}
}
/*
* Now see if we can see the SCA.
*/
outb(port + SR_PCR, SR_PCR_SCARUN | inb(port + SR_PCR));
SRC_PUT8(port, sca->wcrl, 0);
SRC_PUT8(port, sca->wcrm, 0);
SRC_PUT8(port, sca->wcrh, 0);
SRC_PUT8(port, sca->pcr, 0);
SRC_PUT8(port, sca->msci[0].tmc, 0);
inb(port);
tmp = SRC_GET8(port, sca->msci[0].tmc);
if (tmp != 0) {
printf("sr%d: Error reading SCA 0, %x\n", id->id_unit, tmp);
return 0;
}
SRC_PUT8(port, sca->msci[0].tmc, 0x5A);
inb(port);
tmp = SRC_GET8(port, sca->msci[0].tmc);
if (tmp != 0x5A) {
printf("sr%d: Error reading SCA 0x5A, %x\n", id->id_unit, tmp);
return 0;
}
SRC_PUT16(port, sca->dmac[0].cda, 0);
inb(port);
tmp = SRC_GET16(port, sca->dmac[0].cda);
if (tmp != 0) {
printf("sr%d: Error reading SCA 0, %x\n", id->id_unit, tmp);
return 0;
}
SRC_PUT16(port, sca->dmac[0].cda, 0x55AA);
inb(port);
tmp = SRC_GET16(port, sca->dmac[0].cda);
if (tmp != 0x55AA) {
printf("sr%d: Error reading SCA 0x55AA, %x\n",
id->id_unit, tmp);
return 0;
}
/*
* OK, the board's interface registers seem to work. Now we'll see
* if the Dual-Ported RAM is fully accessible...
*/
outb(port + SR_PCR, SR_PCR_EN_VPM | SR_PCR_ISA16);
outb(port + SR_PSR, SR_PSR_WIN_16K);
/*
* Take the kernel "virtual" address supplied to us and convert
* it to a "real" address. Then program the card to use that.
*/
mar = (kvtop(id->id_maddr) >> 16) & SR_PCR_16M_SEL;
outb(port + SR_PCR, mar | inb(port + SR_PCR));
mar = kvtop(id->id_maddr) >> 12;
outb(port + SR_BAR, mar);
outb(port + SR_PCR, inb(port + SR_PCR) | SR_PCR_MEM_WIN);
smem = (u_short *)id->id_maddr; /* DP RAM Address */
/*
* Here we will perform the memory scan to size the device.
*
* This is done by marking each potential page with a magic number.
* We then loop through the pages looking for that magic number. As
* soon as we no longer see that magic number, we'll quit the scan,
* knowing that no more memory is present. This provides the number
* of pages present on the card.
*
* Note: We're sizing 16K memory granules.
*/
for (i = 0; i <= SR_PSR_PG_SEL; i++) {
outb(port + SR_PSR,
(inb(port + SR_PSR) & ~SR_PSR_PG_SEL) | i);
*smem = 0xAA55;
}
for (i = 0; i <= SR_PSR_PG_SEL; i++) {
outb(port + SR_PSR,
(inb(port + SR_PSR) & ~SR_PSR_PG_SEL) | i);
if (*smem != 0xAA55) {
/*
* If we have less than 64k of memory, give up. That
* is 4 x 16k pages.
*/
if (i < 4) {
printf("sr%d: Bad mem page %d, mem %x, %x.\n",
id->id_unit, i, 0xAA55, *smem);
return 0;
}
break;
}
*smem = i;
}
hc->mempages = i;
hc->memsize = i * SRC_WIN_SIZ;
hc->winmsk = SRC_WIN_MSK;
pgs = i; /* final count of 16K pages */
/*
* This next loop erases the contents of that page in DPRAM
*/
for (i = 0; i <= pgs; i++) {
outb(port + SR_PSR,
(inb(port + SR_PSR) & ~SR_PSR_PG_SEL) | i);
bzero(smem, SRC_WIN_SIZ);
}
SRC_SET_OFF(port);
/*
* We have a card here, fill in what we can.
*/
id->id_msize = SRC_WIN_SIZ;
hc->iobase = id->id_iobase;
hc->sca_base = id->id_iobase;
hc->mem_start = id->id_maddr;
hc->mem_end = (id->id_maddr + id->id_msize) - 1;
hc->mem_pstart = 0;
hc->cunit = id->id_unit;
/*
* Do a little sanity check.
*/
if (sr_irqtable[ffs(id->id_irq) - 1] == 0)
printf("sr%d: Warning: illegal interrupt %d chosen.\n",
id->id_unit, ffs(id->id_irq) - 1);
/*
* Bogus card configuration
*/
if ((hc->numports > NCHAN) /* only 2 ports/card */
||(hc->memsize > (512 * 1024))) /* no more than 256K */
return 0;
return SRC_IO_SIZ; /* return the amount of IO addresses used. */
}
/*
* srattach_isa and srattach_pci allocate memory for hardc, softc and
* data buffers. It also does any initialization that is bus specific.
* At the end they call the common srattach() function.
*/
static int
srattach_isa(struct isa_device *id)
{
u_char mar;
struct sr_hardc *hc = &sr_hardc[id->id_unit];
outb(hc->iobase + SR_PCR, inb(hc->iobase + SR_PCR) | SR_PCR_SCARUN);
outb(hc->iobase + SR_PSR, inb(hc->iobase + SR_PSR) | SR_PSR_EN_SCA_DMA);
outb(hc->iobase + SR_MCR,
SR_MCR_DTR0 | SR_MCR_DTR1 | SR_MCR_TE0 | SR_MCR_TE1);
SRC_SET_ON(hc->iobase);
/*
* Configure the card. Mem address, irq,
*/
mar = (kvtop(id->id_maddr) >> 16) & SR_PCR_16M_SEL;
outb(hc->iobase + SR_PCR,
mar | (inb(hc->iobase + SR_PCR) & ~SR_PCR_16M_SEL));
mar = kvtop(id->id_maddr) >> 12;
outb(hc->iobase + SR_BAR, mar);
/*
* Allocate the software interface table(s)
*/
hc->sc = malloc(hc->numports * sizeof(struct sr_softc),
M_DEVBUF, M_WAITOK);
bzero(hc->sc, hc->numports * sizeof(struct sr_softc));
/*
* Get the TX clock direction and configuration. The default is a
* single external clock which is used by RX and TX.
*/
#ifdef N2_TEST_SPEED
if (sr_test_speed[0] > 0)
hc->sc[0].clk_cfg = SR_FLAGS_INT_CLK;
else if (id->id_flags & SR_FLAGS_0_CLK_MSK)
hc->sc[0].clk_cfg =
(id->id_flags & SR_FLAGS_0_CLK_MSK)
>> SR_FLAGS_CLK_SHFT;
#else
if (id->id_flags & SR_FLAGS_0_CLK_MSK)
hc->sc[0].clk_cfg =
(id->id_flags & SR_FLAGS_0_CLK_MSK)
>> SR_FLAGS_CLK_SHFT;
#endif
if (hc->numports == 2)
#ifdef N2_TEST_SPEED
if (sr_test_speed[1] > 0)
hc->sc[0].clk_cfg = SR_FLAGS_INT_CLK;
else
#endif
if (id->id_flags & SR_FLAGS_1_CLK_MSK)
hc->sc[1].clk_cfg = (id->id_flags & SR_FLAGS_1_CLK_MSK)
>> (SR_FLAGS_CLK_SHFT + SR_FLAGS_CLK_CHAN_SHFT);
return srattach(hc);
}
struct sr_hardc *
srattach_pci(int unit, vm_offset_t plx_vaddr, vm_offset_t sca_vaddr)
{
int numports, pndx;
u_int fecr, *fecrp = (u_int *)(sca_vaddr + SR_FECR);
struct sr_hardc *hc, **hcp;
/*
* Configure the PLX. This is magic. I'm doing it just like I'm told
* to. :-)
*
* offset
* 0x00 - Map Range - Mem-mapped to locate anywhere
* 0x04 - Re-Map - PCI address decode enable
* 0x18 - Bus Region - 32-bit bus, ready enable
* 0x1c - Master Range - include all 16 MB
* 0x20 - Master RAM - Map SCA Base at 0
* 0x28 - Master Remap - direct master memory enable
* 0x68 - Interrupt - Enable interrupt (0 to disable)
*
* Note: This is "cargo cult" stuff. - jrc
*/
*((u_int *)(plx_vaddr + 0x00)) = 0xfffff000;
*((u_int *)(plx_vaddr + 0x04)) = 1;
*((u_int *)(plx_vaddr + 0x18)) = 0x40030043;
*((u_int *)(plx_vaddr + 0x1c)) = 0xff000000;
*((u_int *)(plx_vaddr + 0x20)) = 0;
*((u_int *)(plx_vaddr + 0x28)) = 0xe9;
*((u_int *)(plx_vaddr + 0x68)) = 0x10900;
/*
* Get info from card.
*
* Only look for the second port if the first exists. Too many things
* will break if we have only a second port.
*/
fecr = *fecrp;
numports = 0;
if (((fecr & SR_FECR_ID0) >> SR_FE_ID0_SHFT) != SR_FE_ID_NONE) {
numports++;
if (((fecr & SR_FECR_ID1) >> SR_FE_ID1_SHFT) != SR_FE_ID_NONE)
numports++;
}
if (numports == 0)
return NULL;
hc = sr_hardc_pci;
hcp = &sr_hardc_pci;
while (hc) {
hcp = &hc->next;
hc = hc->next;
}
hc = malloc(sizeof(struct sr_hardc), M_DEVBUF, M_WAITOK);
*hcp = hc;
bzero(hc, sizeof(struct sr_hardc));
hc->sc = malloc(numports * sizeof(struct sr_softc),
M_DEVBUF, M_WAITOK);
bzero(hc->sc, numports * sizeof(struct sr_softc));
hc->numports = numports;
hc->cunit = unit;
hc->cardtype = SR_CRD_N2PCI;
hc->plx_base = (caddr_t)plx_vaddr;
hc->sca_base = sca_vaddr;
hc->src_put8 = src_put8_mem;
hc->src_put16 = src_put16_mem;
hc->src_get8 = src_get8_mem;
hc->src_get16 = src_get16_mem;
/*
* Malloc area for tx and rx buffers. For now allocate SRC_WIN_SIZ
* (16k) for each buffer.
*
* Allocate the block below 16M because the N2pci card can only access
* 16M memory at a time.
*
* (We could actually allocate a contiguous block above the 16MB limit,
* but this would complicate card programming more than we want to
* right now -jrc)
*/
hc->memsize = 2 * hc->numports * SRC_WIN_SIZ;
hc->mem_start = contigmalloc(hc->memsize,
M_DEVBUF,
M_NOWAIT,
0ul,
0xfffffful,
0x10000,
0x1000000);
if (hc->mem_start == NULL) {
printf("src%d: pci: failed to allocate buffer space.\n", unit);
return NULL;
}
hc->winmsk = 0xffffffff;
hc->mem_end = (caddr_t)((u_int)hc->mem_start + hc->memsize);
hc->mem_pstart = kvtop(hc->mem_start);
bzero(hc->mem_start, hc->memsize);
for (pndx = 0; pndx < numports; pndx++) {
int intf_sw;
struct sr_softc *sc;
sc = &hc->sc[pndx];
switch (pndx) {
case 1:
intf_sw = fecr & SR_FECR_ID1 >> SR_FE_ID1_SHFT;
break;
case 0:
default:
intf_sw = fecr & SR_FECR_ID0 >> SR_FE_ID0_SHFT;
}
#ifdef N2_TEST_SPEED
if (sr_test_speed[pndx] > 0)
sc->clk_cfg = SR_FLAGS_INT_CLK;
else
#endif
switch (intf_sw) {
default:
case SR_FE_ID_RS232:
case SR_FE_ID_HSSI:
case SR_FE_ID_RS422:
case SR_FE_ID_TEST:
break;
case SR_FE_ID_V35:
sc->clk_cfg = SR_FLAGS_EXT_SEP_CLK;
break;
case SR_FE_ID_X21:
sc->clk_cfg = SR_FLAGS_EXT_CLK;
break;
}
}
*fecrp = SR_FECR_DTR0
| SR_FECR_DTR1
| SR_FECR_TE0
| SR_FECR_TE1;
srattach(hc);
return hc;
}
/*
* Register the ports on the adapter.
* Fill in the info for each port.
* Attach each port to sppp and bpf.
*/
static int
srattach(struct sr_hardc *hc)
{
struct sr_softc *sc = hc->sc;
struct ifnet *ifp;
int unit; /* index: channel w/in card */
/*
* Report Card configuration information before we start configuring
* each channel on the card...
*/
printf("src%d: %uK RAM (%d mempages) @ %08x-%08x, %u ports.\n",
hc->cunit, hc->memsize / 1024, hc->mempages,
(u_int)hc->mem_start, (u_int)hc->mem_end, hc->numports);
src_init(hc);
sr_init_sca(hc);
/*
* Now configure each port on the card.
*/
for (unit = 0; unit < hc->numports; sc++, unit++) {
sc->hc = hc;
sc->subunit = unit;
sc->unit = next_sc_unit;
next_sc_unit++;
sc->scachan = unit % NCHAN;
sr_init_rx_dmac(sc);
sr_init_tx_dmac(sc);
sr_init_msci(sc);
ifp = &sc->ifsppp.pp_if;
ifp->if_softc = sc;
ifp->if_unit = sc->unit;
ifp->if_name = "sr";
ifp->if_mtu = PP_MTU;
ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = srioctl;
ifp->if_start = srstart;
ifp->if_watchdog = srwatchdog;
printf("sr%d: Adapter %d, port %d.\n",
sc->unit, hc->cunit, sc->subunit);
/*
* Despite the fact that we want to allow both PPP *and*
* Frame Relay access to a channel, due to the architecture
* of the system, we'll have to do the attach here.
*
* At some point I'll defer the attach to the "up" call and
* have the attach/detach performed when the interface is
* up/downed...
*/
sc->attached = 0;
sc->protocol = N2_USE_PPP; /* default protocol */
#if 0
sc->ifsppp.pp_flags = PP_KEEPALIVE;
sppp_attach((struct ifnet *)&sc->ifsppp);
#endif
if_attach(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_PPP, PPP_HEADER_LEN);
#endif
}
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
return 1;
}
/*
* N2 Interrupt Service Routine
*
* First figure out which SCA gave the interrupt.
* Process it.
* See if there is other interrupts pending.
* Repeat until there no interrupts remain.
*/
void
srintr(int unit)
{
struct sr_hardc *hc;
hc = &sr_hardc[unit];
srintr_hc(hc);
return;
}
void
srintr_hc(struct sr_hardc *hc)
{
sca_regs *sca = hc->sca; /* MSCI register tree */
u_char isr0, isr1, isr2; /* interrupt statii captured */
#if BUGGY > 1
printf("sr: srintr_hc(hc=%08x)\n", hc);
#endif
/*
* Since multiple interfaces may share this interrupt, we must loop
* until no interrupts are still pending service.
*/
while (1) {
/*
* Read all three interrupt status registers from the N2
* card...
*/
isr0 = SRC_GET8(hc->sca_base, sca->isr0);
isr1 = SRC_GET8(hc->sca_base, sca->isr1);
isr2 = SRC_GET8(hc->sca_base, sca->isr2);
/*
* If all three registers returned 0, we've finished
* processing interrupts from this device, so we can quit
* this loop...
*/
if ((isr0 | isr1 | isr2) == 0)
break;
#if BUGGY > 2
printf("src%d: srintr_hc isr0 %x, isr1 %x, isr2 %x\n",
unit, isr0, isr1, isr2);
#endif
/*
* Now we can dispatch the interrupts. Since we don't expect
* either MSCI or timer interrupts, we'll test for DMA
* interrupts first...
*/
if (isr1) /* DMA-initiated interrupt */
sr_dmac_intr(hc, isr1);
if (isr0) /* serial part IRQ? */
sr_msci_intr(hc, isr0);
if (isr2) /* timer-initiated interrupt */
sr_timer_intr(hc, isr2);
}
}
/*
* This will only start the transmitter. It is assumed that the data
* is already there.
* It is normally called from srstart() or sr_dmac_intr().
*/
static void
sr_xmit(struct sr_softc *sc)
{
u_short cda_value; /* starting descriptor */
u_short eda_value; /* ending descriptor */
struct sr_hardc *hc;
struct ifnet *ifp; /* O/S Network Services */
dmac_channel *dmac; /* DMA channel registers */
#if BUGGY > 0
printf("sr: sr_xmit( sc=%08x)\n", sc);
#endif
hc = sc->hc;
ifp = &sc->ifsppp.pp_if;
dmac = &hc->sca->dmac[DMAC_TXCH(sc->scachan)];
/*
* Get the starting and ending addresses of the chain to be
* transmitted and pass these on to the DMA engine on-chip.
*/
cda_value = sc->block[sc->txb_next_tx].txdesc + hc->mem_pstart;
cda_value &= 0x00ffff;
eda_value = sc->block[sc->txb_next_tx].txeda + hc->mem_pstart;
eda_value &= 0x00ffff;
SRC_PUT16(hc->sca_base, dmac->cda, cda_value);
SRC_PUT16(hc->sca_base, dmac->eda, eda_value);
/*
* Now we'll let the DMA status register know about this change
*/
SRC_PUT8(hc->sca_base, dmac->dsr, SCA_DSR_DE);
sc->xmit_busy = 1; /* mark transmitter busy */
#if BUGGY > 2
printf("sr%d: XMIT cda=%04x, eda=%4x, rcda=%08lx\n",
sc->unit, cda_value, eda_value,
sc->block[sc->txb_next_tx].txdesc + hc->mem_pstart);
#endif
sc->txb_next_tx++; /* update next transmit seq# */
if (sc->txb_next_tx == SR_TX_BLOCKS) /* handle wrap... */
sc->txb_next_tx = 0;
/*
* Finally, we'll set a timout (which will start srwatchdog())
* within the O/S network services layer...
*/
ifp->if_timer = 2; /* Value in seconds. */
}
/*
* This function will be called from the upper level when a user add a
* packet to be send, and from the interrupt handler after a finished
* transmit.
*
* NOTE: it should run at spl_imp().
*
* This function only place the data in the oncard buffers. It does not
* start the transmition. sr_xmit() does that.
*
* Transmitter idle state is indicated by the IFF_OACTIVE flag.
* The function that clears that should ensure that the transmitter
* and it's DMA is in a "good" idle state.
*/
static void
srstart(struct ifnet *ifp)
{
struct sr_softc *sc; /* channel control structure */
struct sr_hardc *hc; /* card control/config block */
int len; /* total length of a packet */
int pkts; /* packets placed in DPRAM */
int tlen; /* working length of pkt */
u_int i;
struct mbuf *mtx; /* message buffer from O/S */
u_char *txdata; /* buffer address in DPRAM */
sca_descriptor *txdesc; /* working descriptor pointr */
struct buf_block *blkp;
#if BUGGY > 0
printf("sr: srstart( ifp=%08x)\n", ifp);
#endif
sc = ifp->if_softc;
hc = sc->hc;
if ((ifp->if_flags & IFF_RUNNING) == 0)
return;
/*
* It is OK to set the memory window outside the loop because all tx
* buffers and descriptors are assumed to be in the same 16K window.
*/
if (hc->mempages) {
SRC_SET_ON(hc->iobase);
SRC_SET_MEM(hc->iobase, sc->block[0].txdesc);
}
/*
* Loop to place packets into DPRAM.
*
* We stay in this loop until there is nothing in
* the TX queue left or the tx buffers are full.
*/
top_srstart:
/*
* See if we have space for more packets.
*/
if (sc->txb_inuse == SR_TX_BLOCKS) { /* out of space? */
ifp->if_flags |= IFF_OACTIVE; /* yes, mark active */
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
#if BUGGY > 9
printf("sr%d.srstart: sc->txb_inuse=%d; DPRAM full...\n",
sc->unit, sc->txb_inuse);
#endif
return;
}
/*
* OK, the card can take more traffic. Let's see if there's any
* pending from the system...
*
* NOTE:
* The architecture of the networking interface doesn't
* actually call us like 'write()', providing an address. We get
* started, a lot like a disk strategy routine, and we actually call
* back out to the system to get traffic to send...
*
* NOTE:
* If we were gonna run through another layer, we would use a
* dispatch table to select the service we're getting a packet
* from...
*/
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
mtx = fr_dequeue(ifp);
break;
#endif
case N2_USE_PPP:
default:
mtx = sppp_dequeue(ifp);
}
if (!mtx) {
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
return;
}
/*
* OK, we got a packet from the network services of the O/S. Now we
* can move it into the DPRAM (under control of the descriptors) and
* fire it off...
*/
pkts = 0;
i = 0; /* counts # of granules used */
blkp = &sc->block[sc->txb_new]; /* address of free granule */
txdesc = (sca_descriptor *)
(hc->mem_start + (blkp->txdesc & hc->winmsk));
txdata = (u_char *)(hc->mem_start
+ (blkp->txstart & hc->winmsk));
/*
* Now we'll try to install as many packets as possible into the
* card's DP RAM buffers.
*/
for (;;) { /* perform actual copy of packet */
len = mtx->m_pkthdr.len; /* length of message */
#if BUGGY > 1
printf("sr%d.srstart: mbuf @ %08lx, %d bytes\n",
sc->unit, mtx, len);
#endif
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp, mtx);
#endif
/*
* We can perform a straight copy because the tranmit
* buffers won't wrap.
*/
m_copydata(mtx, 0, len, txdata);
/*
* Now we know how big the message is gonna be. We must now
* construct the descriptors to drive this message out...
*/
tlen = len;
while (tlen > SR_BUF_SIZ) { /* loop for full granules */
txdesc->stat = 0; /* reset bits */
txdesc->len = SR_BUF_SIZ; /* size of granule */
tlen -= SR_BUF_SIZ;
txdesc++; /* move to next dscr */
txdata += SR_BUF_SIZ; /* adjust data addr */
i++;
}
/*
* This section handles the setting of the final piece of a
* message.
*/
txdesc->stat = SCA_DESC_EOM;
txdesc->len = tlen;
pkts++;
/*
* prepare for subsequent packets (if any)
*/
txdesc++;
txdata += SR_BUF_SIZ; /* next mem granule */
i++; /* count of granules */
/*
* OK, we've now placed the message into the DPRAM where it
* can be transmitted. We'll now release the message memory
* and update the statistics...
*/
m_freem(mtx);
++sc->ifsppp.pp_if.if_opackets;
/*
* Check if we have space for another packet. XXX This is
* hardcoded. A packet can't be larger than 3 buffers (3 x
* 512).
*/
if ((i + 3) >= blkp->txmax) { /* enough remains? */
#if BUGGY > 9
printf("sr%d.srstart: i=%d (%d pkts); card full.\n",
sc->unit, i, pkts);
#endif
break;
}
/*
* We'll pull the next message to be sent (if any)
*/
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
mtx = fr_dequeue(ifp);
break;
#endif
case N2_USE_PPP:
default:
mtx = sppp_dequeue(ifp);
}
if (!mtx) { /* no message? We're done! */
#if BUGGY > 9
printf("sr%d.srstart: pending=0, pkts=%d\n",
sc->unit, pkts);
#endif
break;
}
}
blkp->txtail = i; /* record next free granule */
/*
* Mark the last descriptor, so that the SCA know where to stop.
*/
txdesc--; /* back up to last descriptor in list */
txdesc->stat |= SCA_DESC_EOT; /* mark as end of list */
/*
* Now we'll reset the transmit granule's descriptor address so we
* can record this in the structure and fire it off w/ the DMA
* processor of the serial chip...
*/
txdesc = (sca_descriptor *)blkp->txdesc;
blkp->txeda = (u_short)((u_int)&txdesc[i]);
sc->txb_inuse++; /* update inuse status */
sc->txb_new++; /* new traffic wuz added */
if (sc->txb_new == SR_TX_BLOCKS)
sc->txb_new = 0;
/*
* If the tranmitter wasn't marked as "busy" we will force it to be
* started...
*/
if (sc->xmit_busy == 0) {
sr_xmit(sc);
#if BUGGY > 9
printf("sr%d.srstart: called sr_xmit()\n", sc->unit);
#endif
}
goto top_srstart;
}
/*
* Handle ioctl's at the device level, though we *will* call up
* a layer...
*/
#if BUGGY > 2
static int bug_splats[] = {0, 0, 0, 0, 0, 0, 0, 0};
#endif
static int
srioctl(struct ifnet *ifp, int cmd, caddr_t data)
{
int s, error, was_up, should_be_up;
struct sppp *sp = (struct sppp *)ifp;
struct sr_softc *sc = ifp->if_softc;
#if BUGGY > 0
printf("sr%d: srioctl(ifp=%08x, cmd=%08x, data=%08x)\n",
ifp->if_unit, ifp, cmd, data);
#endif
was_up = ifp->if_flags & IFF_RUNNING;
if (cmd == SIOCSIFFLAGS) {
/*
* First, handle an apparent protocol switch
*/
#if NFR > 0
if (was_up == 0)/* can only happen if DOWN */
if (ifp->if_flags & IFF_LINK1)
sc->protocol = N2_USE_FRP;
else
sc->protocol = N2_USE_PPP;
#else
sc->protocol = N2_USE_PPP;
ifp->if_flags &= ~IFF_LINK1;
#endif
/*
* Next we can handle minor protocol point(s)
*/
if (ifp->if_flags & IFF_LINK2)
sp->pp_flags |= PP_CISCO;
else
sp->pp_flags &= ~PP_CISCO;
}
/*
* Next, we'll allow the network service layer we've called process
* the ioctl...
*/
if ((sc->attached != 0)
&& (sc->attached != sc->protocol)) {
switch (sc->attached) {
#if NFR > 0
case N2_USE_FRP:
fr_detach(ifp);
break;
#endif
case N2_USE_PPP:
default:
sppp_detach(ifp);
}
sc->attached = 0;
}
if (sc->attached == 0) {
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
fr_attach(&sc->ifsppp.pp_if);
break;
#endif
case N2_USE_PPP:
default:
sc->ifsppp.pp_flags = PP_KEEPALIVE;
sppp_attach(&sc->ifsppp.pp_if);
/*
* Shortcut the sppp tls/tlf actions to
* up/down events since our lower layer is
* always ready.
*/
sc->ifsppp.pp_tls = sc->ifsppp.pp_up;
sc->ifsppp.pp_tlf = sc->ifsppp.pp_down;
}
sc->attached = sc->protocol;
}
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
error = fr_ioctl(ifp, cmd, data);
break;
#endif
case N2_USE_PPP:
default:
error = sppp_ioctl(ifp, cmd, data);
}
#if BUGGY > 1
printf("sr%d: ioctl: ifsppp.pp_flags = %08x, if_flags %08x.\n",
ifp->if_unit, ((struct sppp *)ifp)->pp_flags, ifp->if_flags);
#endif
if (error)
return error;
if ((cmd != SIOCSIFFLAGS) && (cmd != SIOCSIFADDR)) {
#if BUGGY > 2
if (bug_splats[sc->unit]++ < 2) {
printf("sr(%d).if_addrlist = %08x\n",
sc->unit, ifp->if_addrlist);
printf("sr(%d).if_bpf = %08x\n",
sc->unit, ifp->if_bpf);
printf("sr(%d).if_init = %08x\n",
sc->unit, ifp->if_init);
printf("sr(%d).if_output = %08x\n",
sc->unit, ifp->if_output);
printf("sr(%d).if_start = %08x\n",
sc->unit, ifp->if_start);
printf("sr(%d).if_done = %08x\n",
sc->unit, ifp->if_done);
printf("sr(%d).if_ioctl = %08x\n",
sc->unit, ifp->if_ioctl);
printf("sr(%d).if_reset = %08x\n",
sc->unit, ifp->if_reset);
printf("sr(%d).if_watchdog = %08x\n",
sc->unit, ifp->if_watchdog);
}
#endif
return 0;
}
s = splimp();
should_be_up = ifp->if_flags & IFF_RUNNING;
if (!was_up && should_be_up) {
/*
* Interface should be up -- start it.
*/
sr_up(sc);
srstart(ifp);
/*
* XXX Clear the IFF_UP flag so that the link will only go
* up after sppp lcp and ipcp negotiation.
*/
ifp->if_flags &= ~IFF_UP;
} else if (was_up && !should_be_up) {
/*
* Interface should be down -- stop it.
*/
sr_down(sc);
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
fr_flush(ifp);
break;
#endif
case N2_USE_PPP:
default:
sppp_flush(ifp);
}
}
splx(s);
#if BUGGY > 2
if (bug_splats[sc->unit]++ < 2) {
printf("sr(%d).if_addrlist = %08x\n",
sc->unit, ifp->if_addrlist);
printf("sr(%d).if_bpf = %08x\n",
sc->unit, ifp->if_bpf);
printf("sr(%d).if_init = %08x\n",
sc->unit, ifp->if_init);
printf("sr(%d).if_output = %08x\n",
sc->unit, ifp->if_output);
printf("sr(%d).if_start = %08x\n",
sc->unit, ifp->if_start);
printf("sr(%d).if_done = %08x\n",
sc->unit, ifp->if_done);
printf("sr(%d).if_ioctl = %08x\n",
sc->unit, ifp->if_ioctl);
printf("sr(%d).if_reset = %08x\n",
sc->unit, ifp->if_reset);
printf("sr(%d).if_watchdog = %08x\n",
sc->unit, ifp->if_watchdog);
}
#endif
return 0;
}
/*
* This is to catch lost tx interrupts.
*/
static void
srwatchdog(struct ifnet *ifp)
{
int got_st0, got_st1, got_st3, got_dsr;
struct sr_softc *sc = ifp->if_softc;
struct sr_hardc *hc = sc->hc;
msci_channel *msci = &hc->sca->msci[sc->scachan];
dmac_channel *dmac = &sc->hc->sca->dmac[sc->scachan];
#if BUGGY > 0
printf("srwatchdog(unit=%d)\n", unit);
#endif
if (!(ifp->if_flags & IFF_RUNNING))
return;
ifp->if_oerrors++; /* update output error count */
got_st0 = SRC_GET8(hc->sca_base, msci->st0);
got_st1 = SRC_GET8(hc->sca_base, msci->st1);
got_st3 = SRC_GET8(hc->sca_base, msci->st3);
got_dsr = SRC_GET8(hc->sca_base, dmac->dsr);
#if 0
if (ifp->if_flags & IFF_DEBUG)
#endif
printf("sr%d: transmit failed, "
"ST0 %02x, ST1 %02x, ST3 %02x, DSR %02x.\n",
sc->unit,
got_st0, got_st1, got_st3, got_dsr);
if (SRC_GET8(hc->sca_base, msci->st1) & SCA_ST1_UDRN) {
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_TXABORT);
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_TXENABLE);
SRC_PUT8(hc->sca_base, msci->st1, SCA_ST1_UDRN);
}
sc->xmit_busy = 0;
ifp->if_flags &= ~IFF_OACTIVE;
if (sc->txb_inuse && --sc->txb_inuse)
sr_xmit(sc);
srstart(ifp); /* restart transmitter */
}
static void
sr_up(struct sr_softc *sc)
{
u_int *fecrp;
struct sr_hardc *hc = sc->hc;
sca_regs *sca = hc->sca;
msci_channel *msci = &sca->msci[sc->scachan];
#if BUGGY > 0
printf("sr_up(sc=%08x)\n", sc);
#endif
/*
* This section should really do the attach to the appropriate
* system service, be it frame relay or PPP...
*/
if (sc->attached == 0) {
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
fr_attach(&sc->ifsppp.pp_if);
break;
#endif
case N2_USE_PPP:
default:
sc->ifsppp.pp_flags = PP_KEEPALIVE;
sppp_attach(&sc->ifsppp.pp_if);
/*
* Shortcut the sppp tls/tlf actions to
* up/down events since our lower layer is
* always ready.
*/
sc->ifsppp.pp_tls = sc->ifsppp.pp_up;
sc->ifsppp.pp_tlf = sc->ifsppp.pp_down;
}
sc->attached = sc->protocol;
}
/*
* Enable transmitter and receiver. Raise DTR and RTS. Enable
* interrupts.
*
* XXX What about using AUTO mode in msci->md0 ???
*/
SRC_PUT8(hc->sca_base, msci->ctl,
SRC_GET8(hc->sca_base, msci->ctl) & ~SCA_CTL_RTS);
if (sc->scachan == 0)
switch (hc->cardtype) {
case SR_CRD_N2:
outb(hc->iobase + SR_MCR,
(inb(hc->iobase + SR_MCR) & ~SR_MCR_DTR0));
break;
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp &= ~SR_FECR_DTR0;
break;
}
else
switch (hc->cardtype) {
case SR_CRD_N2:
outb(hc->iobase + SR_MCR,
(inb(hc->iobase + SR_MCR) & ~SR_MCR_DTR1));
break;
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp &= ~SR_FECR_DTR1;
break;
}
if (sc->scachan == 0) {
SRC_PUT8(hc->sca_base, sca->ier0,
SRC_GET8(hc->sca_base, sca->ier0) | 0x000F);
SRC_PUT8(hc->sca_base, sca->ier1,
SRC_GET8(hc->sca_base, sca->ier1) | 0x000F);
} else {
SRC_PUT8(hc->sca_base, sca->ier0,
SRC_GET8(hc->sca_base, sca->ier0) | 0x00F0);
SRC_PUT8(hc->sca_base, sca->ier1,
SRC_GET8(hc->sca_base, sca->ier1) | 0x00F0);
}
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_RXENABLE);
inb(hc->iobase); /* XXX slow it down a bit. */
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_TXENABLE);
#ifdef USE_MODEMCK
if (sr_watcher == 0)
sr_modemck(NULL);
#endif
}
static void
sr_down(struct sr_softc *sc)
{
u_int *fecrp;
struct sr_hardc *hc = sc->hc;
sca_regs *sca = hc->sca;
msci_channel *msci = &sca->msci[sc->scachan];
#if BUGGY > 0
printf("sr_down(sc=%08x)\n", sc);
#endif
/*
* Disable transmitter and receiver. Lower DTR and RTS. Disable
* interrupts.
*/
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_RXDISABLE);
inb(hc->iobase); /* XXX slow it down a bit. */
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_TXDISABLE);
SRC_PUT8(hc->sca_base, msci->ctl,
SRC_GET8(hc->sca_base, msci->ctl) | SCA_CTL_RTS);
if (sc->scachan == 0)
switch (hc->cardtype) {
case SR_CRD_N2:
outb(hc->iobase + SR_MCR,
(inb(hc->iobase + SR_MCR) | SR_MCR_DTR0));
break;
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp |= SR_FECR_DTR0;
break;
}
else
switch (hc->cardtype) {
case SR_CRD_N2:
outb(hc->iobase + SR_MCR,
(inb(hc->iobase + SR_MCR) | SR_MCR_DTR1));
break;
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp |= SR_FECR_DTR1;
break;
}
if (sc->scachan == 0) {
SRC_PUT8(hc->sca_base, sca->ier0,
SRC_GET8(hc->sca_base, sca->ier0) & ~0x0F);
SRC_PUT8(hc->sca_base, sca->ier1,
SRC_GET8(hc->sca_base, sca->ier1) & ~0x0F);
} else {
SRC_PUT8(hc->sca_base, sca->ier0,
SRC_GET8(hc->sca_base, sca->ier0) & ~0xF0);
SRC_PUT8(hc->sca_base, sca->ier1,
SRC_GET8(hc->sca_base, sca->ier1) & ~0xF0);
}
/*
* This section does the detach from the currently configured net
* service, be it frame relay or PPP...
*/
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
fr_detach(&sc->ifsppp.pp_if);
break;
#endif
case N2_USE_PPP:
default:
sppp_detach(&sc->ifsppp.pp_if);
}
sc->attached = 0;
}
/*
* Initialize the card, allocate memory for the sr_softc structures
* and fill in the pointers.
*/
static void
src_init(struct sr_hardc *hc)
{
struct sr_softc *sc = hc->sc;
int x;
u_int chanmem;
u_int bufmem;
u_int next;
u_int descneeded;
#if BUGGY > 0
printf("src_init(hc=%08x)\n", hc);
#endif
chanmem = hc->memsize / hc->numports;
next = 0;
for (x = 0; x < hc->numports; x++, sc++) {
int blk;
for (blk = 0; blk < SR_TX_BLOCKS; blk++) {
sc->block[blk].txdesc = next;
bufmem = (16 * 1024) / SR_TX_BLOCKS;
descneeded = bufmem / SR_BUF_SIZ;
sc->block[blk].txstart = sc->block[blk].txdesc
+ ((((descneeded * sizeof(sca_descriptor))
/ SR_BUF_SIZ) + 1)
* SR_BUF_SIZ);
sc->block[blk].txend = next + bufmem;
sc->block[blk].txmax =
(sc->block[blk].txend - sc->block[blk].txstart)
/ SR_BUF_SIZ;
next += bufmem;
#if BUGGY > 2
printf("sr%d: blk %d: txdesc %08x, txstart %08x\n",
sc->unit, blk,
sc->block[blk].txdesc, sc->block[blk].txstart);
#endif
}
sc->rxdesc = next;
bufmem = chanmem - (bufmem * SR_TX_BLOCKS);
descneeded = bufmem / SR_BUF_SIZ;
sc->rxstart = sc->rxdesc +
((((descneeded * sizeof(sca_descriptor)) /
SR_BUF_SIZ) + 1) * SR_BUF_SIZ);
sc->rxend = next + bufmem;
sc->rxmax = (sc->rxend - sc->rxstart) / SR_BUF_SIZ;
next += bufmem;
}
}
/*
* The things done here are channel independent.
*
* Configure the sca waitstates.
* Configure the global interrupt registers.
* Enable master dma enable.
*/
static void
sr_init_sca(struct sr_hardc *hc)
{
sca_regs *sca = hc->sca;
#if BUGGY > 0
printf("sr_init_sca(hc=%08x)\n", hc);
#endif
/*
* Do the wait registers. Set everything to 0 wait states.
*/
SRC_PUT8(hc->sca_base, sca->pabr0, 0);
SRC_PUT8(hc->sca_base, sca->pabr1, 0);
SRC_PUT8(hc->sca_base, sca->wcrl, 0);
SRC_PUT8(hc->sca_base, sca->wcrm, 0);
SRC_PUT8(hc->sca_base, sca->wcrh, 0);
/*
* Configure the interrupt registers. Most are cleared until the
* interface is configured.
*/
SRC_PUT8(hc->sca_base, sca->ier0, 0x00); /* MSCI interrupts. */
SRC_PUT8(hc->sca_base, sca->ier1, 0x00); /* DMAC interrupts */
SRC_PUT8(hc->sca_base, sca->ier2, 0x00); /* TIMER interrupts. */
SRC_PUT8(hc->sca_base, sca->itcr, 0x00); /* Use ivr and no intr
* ack */
SRC_PUT8(hc->sca_base, sca->ivr, 0x40); /* Interrupt vector. */
SRC_PUT8(hc->sca_base, sca->imvr, 0x40);
/*
* Configure the timers. XXX Later
*/
/*
* Set the DMA channel priority to rotate between all four channels.
*
* Enable all dma channels.
*/
SRC_PUT8(hc->sca_base, sca->pcr, SCA_PCR_PR2);
SRC_PUT8(hc->sca_base, sca->dmer, SCA_DMER_EN);
}
/*
* Configure the msci
*
* NOTE: The serial port configuration is hardcoded at the moment.
*/
static void
sr_init_msci(struct sr_softc *sc)
{
int portndx; /* on-board port number */
u_int mcr_v; /* contents of modem control */
u_int *fecrp; /* pointer for PCI's MCR i/o */
struct sr_hardc *hc = sc->hc;
msci_channel *msci = &hc->sca->msci[sc->scachan];
#ifdef N2_TEST_SPEED
int br_v; /* contents for BR divisor */
int etcndx; /* index into ETC table */
int fifo_v, gotspeed; /* final tabled speed found */
int tmc_v; /* timer control register */
int wanted; /* speed (bitrate) wanted... */
struct rate_line *rtp;
#endif
portndx = sc->scachan;
#if BUGGY > 0
printf("sr: sr_init_msci( sc=%08x)\n", sc);
#endif
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_RESET);
SRC_PUT8(hc->sca_base, msci->md0, SCA_MD0_CRC_1 |
SCA_MD0_CRC_CCITT |
SCA_MD0_CRC_ENABLE |
SCA_MD0_MODE_HDLC);
SRC_PUT8(hc->sca_base, msci->md1, SCA_MD1_NOADDRCHK);
SRC_PUT8(hc->sca_base, msci->md2, SCA_MD2_DUPLEX | SCA_MD2_NRZ);
/*
* According to the manual I should give a reset after changing the
* mode registers.
*/
SRC_PUT8(hc->sca_base, msci->cmd, SCA_CMD_RXRESET);
SRC_PUT8(hc->sca_base, msci->ctl, SCA_CTL_IDLPAT |
SCA_CTL_UDRNC |
SCA_CTL_RTS);
/*
* XXX Later we will have to support different clock settings.
*/
switch (sc->clk_cfg) {
default:
#if BUGGY > 0
printf("sr%: clk_cfg=%08x, selected default clock.\n",
portndx, sc->clk_cfg);
#endif
/* FALLTHROUGH */
case SR_FLAGS_EXT_CLK:
/*
* For now all interfaces are programmed to use the RX clock
* for the TX clock.
*/
#if BUGGY > 0
printf("sr%d: External Clock Selected.\n", portndx);
#endif
SRC_PUT8(hc->sca_base, msci->rxs, 0);
SRC_PUT8(hc->sca_base, msci->txs, 0);
break;
case SR_FLAGS_EXT_SEP_CLK:
#if BUGGY > 0
printf("sr%d: Split Clocking Selected.\n", portndx);
#endif
#if 1
SRC_PUT8(hc->sca_base, msci->rxs, 0);
SRC_PUT8(hc->sca_base, msci->txs, 0);
#else
SRC_PUT8(hc->sca_base, msci->rxs,
SCA_RXS_CLK_RXC0 | SCA_RXS_DIV1);
/*
* We need to configure the internal bit clock for the
* transmitter's channel...
*/
SRC_PUT8(hc->sca_base, msci->txs,
SCA_TXS_CLK_RX | SCA_TXS_DIV1);
#endif
break;
case SR_FLAGS_INT_CLK:
#if BUGGY > 0
printf("sr%d: Internal Clocking selected.\n", portndx);
#endif
/*
* XXX I do need some code to set the baud rate here!
*/
#ifdef N2_TEST_SPEED
switch (hc->cardtype) {
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
mcr_v = *fecrp;
etcndx = 2;
break;
case SR_CRD_N2:
default:
mcr_v = inb(hc->iobase + SR_MCR);
etcndx = 0;
}
fifo_v = 0x10; /* stolen from Linux version */
/*
* search for appropriate speed in table, don't calc it:
*/
wanted = sr_test_speed[portndx];
rtp = &n2_rates[0]; /* point to first table item */
while ((rtp->target > 0) /* search table for speed */
&&(rtp->target != wanted))
rtp++;
/*
* We've searched the table for a matching speed. If we've
* found the correct rate line, we'll get the pre-calc'd
* values for the TMC and baud rate divisor for subsequent
* use...
*/
if (rtp->target > 0) { /* use table-provided values */
gotspeed = wanted;
tmc_v = rtp->tmc_reg;
br_v = rtp->br_reg;
} else { /* otherwise assume 1MBit comm rate */
gotspeed = 10000;
tmc_v = 5;
br_v = 1;
}
/*
* Now we mask in the enable clock output for the MCR:
*/
mcr_v |= etc0vals[etcndx + portndx];
/*
* Now we'll program the registers with these speed- related
* contents...
*/
SRC_PUT8(hc->sca_base, msci->tmc, tmc_v);
SRC_PUT8(hc->sca_base, msci->trc0, fifo_v);
SRC_PUT8(hc->sca_base, msci->rxs, SCA_RXS_CLK_INT + br_v);
SRC_PUT8(hc->sca_base, msci->txs, SCA_TXS_CLK_INT + br_v);
switch (hc->cardtype) {
case SR_CRD_N2PCI:
*fecrp = mcr_v;
break;
case SR_CRD_N2:
default:
outb(hc->iobase + SR_MCR, mcr_v);
}
#if BUGGY > 0
if (wanted != gotspeed)
printf("sr%d: Speed wanted=%d, found=%d\n",
wanted, gotspeed);
printf("sr%d: Internal Clock %dx100 BPS, tmc=%d, div=%d\n",
portndx, gotspeed, tmc_v, br_v);
#endif
#else
SRC_PUT8(hc->sca_base, msci->rxs,
SCA_RXS_CLK_INT | SCA_RXS_DIV1);
SRC_PUT8(hc->sca_base, msci->txs,
SCA_TXS_CLK_INT | SCA_TXS_DIV1);
SRC_PUT8(hc->sca_base, msci->tmc, 5);
if (portndx == 0)
switch (hc->cardtype) {
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp |= SR_FECR_ETC0;
break;
case SR_CRD_N2:
default:
mcr_v = inb(hc->iobase + SR_MCR);
mcr_v |= SR_MCR_ETC0;
outb(hc->iobase + SR_MCR, mcr_v);
}
else
switch (hc->cardtype) {
case SR_CRD_N2:
mcr_v = inb(hc->iobase + SR_MCR);
mcr_v |= SR_MCR_ETC1;
outb(hc->iobase + SR_MCR, mcr_v);
break;
case SR_CRD_N2PCI:
fecrp = (u_int *)(hc->sca_base + SR_FECR);
*fecrp |= SR_FECR_ETC1;
break;
}
#endif
}
/*
* XXX Disable all interrupts for now. I think if you are using the
* dmac you don't use these interrupts.
*/
SRC_PUT8(hc->sca_base, msci->ie0, 0);
SRC_PUT8(hc->sca_base, msci->ie1, 0x0C);
SRC_PUT8(hc->sca_base, msci->ie2, 0);
SRC_PUT8(hc->sca_base, msci->fie, 0);
SRC_PUT8(hc->sca_base, msci->sa0, 0);
SRC_PUT8(hc->sca_base, msci->sa1, 0);
SRC_PUT8(hc->sca_base, msci->idl, 0x7E); /* set flags value */
SRC_PUT8(hc->sca_base, msci->rrc, 0x0E);
SRC_PUT8(hc->sca_base, msci->trc0, 0x10);
SRC_PUT8(hc->sca_base, msci->trc1, 0x1F);
}
/*
* Configure the rx dma controller.
*/
static void
sr_init_rx_dmac(struct sr_softc *sc)
{
struct sr_hardc *hc;
dmac_channel *dmac;
sca_descriptor *rxd;
u_int cda_v, sarb_v, rxbuf, rxda, rxda_d;
#if BUGGY > 0
printf("sr_init_rx_dmac(sc=%08x)\n", sc);
#endif
hc = sc->hc;
dmac = &hc->sca->dmac[DMAC_RXCH(sc->scachan)];
if (hc->mempages)
SRC_SET_MEM(hc->iobase, sc->rxdesc);
/*
* This phase initializes the contents of the descriptor table
* needed to construct a circular buffer...
*/
rxd = (sca_descriptor *)(hc->mem_start + (sc->rxdesc & hc->winmsk));
rxda_d = (u_int) hc->mem_start - (sc->rxdesc & ~hc->winmsk);
for (rxbuf = sc->rxstart;
rxbuf < sc->rxend;
rxbuf += SR_BUF_SIZ, rxd++) {
/*
* construct the circular chain...
*/
rxda = (u_int) & rxd[1] - rxda_d + hc->mem_pstart;
rxd->cp = (u_short)(rxda & 0xffff);
/*
* set the on-card buffer address...
*/
rxd->bp = (u_short)((rxbuf + hc->mem_pstart) & 0xffff);
rxd->bpb = (u_char)(((rxbuf + hc->mem_pstart) >> 16) & 0xff);
rxd->len = 0; /* bytes resident w/in granule */
rxd->stat = 0xff; /* The sca write here when finished */
}
/*
* heal the chain so that the last entry points to the first...
*/
rxd--;
rxd->cp = (u_short)((sc->rxdesc + hc->mem_pstart) & 0xffff);
/*
* reset the reception handler's index...
*/
sc->rxhind = 0;
/*
* We'll now configure the receiver's DMA logic...
*/
SRC_PUT8(hc->sca_base, dmac->dsr, 0); /* Disable DMA transfer */
SRC_PUT8(hc->sca_base, dmac->dcr, SCA_DCR_ABRT);
/* XXX maybe also SCA_DMR_CNTE */
SRC_PUT8(hc->sca_base, dmac->dmr, SCA_DMR_TMOD | SCA_DMR_NF);
SRC_PUT16(hc->sca_base, dmac->bfl, SR_BUF_SIZ);
cda_v = (u_short)((sc->rxdesc + hc->mem_pstart) & 0xffff);
sarb_v = (u_char)(((sc->rxdesc + hc->mem_pstart) >> 16) & 0xff);
SRC_PUT16(hc->sca_base, dmac->cda, cda_v);
SRC_PUT8(hc->sca_base, dmac->sarb, sarb_v);
rxd = (sca_descriptor *)sc->rxstart;
SRC_PUT16(hc->sca_base, dmac->eda,
(u_short)((u_int) & rxd[sc->rxmax - 1] & 0xffff));
SRC_PUT8(hc->sca_base, dmac->dir, 0xF0);
SRC_PUT8(hc->sca_base, dmac->dsr, SCA_DSR_DE); /* Enable DMA */
}
/*
* Configure the TX DMA descriptors.
* Initialize the needed values and chain the descriptors.
*/
static void
sr_init_tx_dmac(struct sr_softc *sc)
{
int blk;
u_int txbuf, txda, txda_d;
struct sr_hardc *hc;
sca_descriptor *txd;
dmac_channel *dmac;
struct buf_block *blkp;
u_int x;
u_int sarb_v;
#if BUGGY > 0
printf("sr_init_tx_dmac(sc=%08x)\n", sc);
#endif
hc = sc->hc;
dmac = &hc->sca->dmac[DMAC_TXCH(sc->scachan)];
if (hc->mempages)
SRC_SET_MEM(hc->iobase, sc->block[0].txdesc);
/*
* Initialize the array of descriptors for transmission
*/
for (blk = 0; blk < SR_TX_BLOCKS; blk++) {
blkp = &sc->block[blk];
txd = (sca_descriptor *)(hc->mem_start
+ (blkp->txdesc & hc->winmsk));
txda_d = (u_int) hc->mem_start
- (blkp->txdesc & ~hc->winmsk);
x = 0;
txbuf = blkp->txstart;
for (; txbuf < blkp->txend; txbuf += SR_BUF_SIZ, txd++) {
txda = (u_int) & txd[1] - txda_d + hc->mem_pstart;
txd->cp = (u_short)(txda & 0xffff);
txd->bp = (u_short)((txbuf + hc->mem_pstart)
& 0xffff);
txd->bpb = (u_char)(((txbuf + hc->mem_pstart) >> 16)
& 0xff);
txd->len = 0;
txd->stat = 0;
x++;
}
txd--;
txd->cp = (u_short)((blkp->txdesc + hc->mem_pstart)
& 0xffff);
blkp->txtail = (u_int)txd - (u_int)hc->mem_start;
}
SRC_PUT8(hc->sca_base, dmac->dsr, 0); /* Disable DMA */
SRC_PUT8(hc->sca_base, dmac->dcr, SCA_DCR_ABRT);
SRC_PUT8(hc->sca_base, dmac->dmr, SCA_DMR_TMOD | SCA_DMR_NF);
SRC_PUT8(hc->sca_base, dmac->dir,
SCA_DIR_EOT | SCA_DIR_BOF | SCA_DIR_COF);
sarb_v = (sc->block[0].txdesc + hc->mem_pstart) >> 16;
sarb_v &= 0x00ff;
SRC_PUT8(hc->sca_base, dmac->sarb, (u_char) sarb_v);
}
/*
* Look through the descriptors to see if there is a complete packet
* available. Stop if we get to where the sca is busy.
*
* Return the length and status of the packet.
* Return nonzero if there is a packet available.
*
* NOTE:
* It seems that we get the interrupt a bit early. The updateing of
* descriptor values is not always completed when this is called.
*/
static int
sr_packet_avail(struct sr_softc *sc, int *len, u_char *rxstat)
{
int granules; /* count of granules in pkt */
int wki, wko;
struct sr_hardc *hc;
sca_descriptor *rxdesc; /* current descriptor */
sca_descriptor *endp; /* ending descriptor */
sca_descriptor *cda; /* starting descriptor */
hc = sc->hc; /* get card's information */
/*
* set up starting descriptor by pulling that info from the DMA half
* of the HD chip...
*/
wki = DMAC_RXCH(sc->scachan);
wko = SRC_GET16(hc->sca_base, hc->sca->dmac[wki].cda);
cda = (sca_descriptor *)(hc->mem_start + (wko & hc->winmsk));
#if BUGGY > 1
printf("sr_packet_avail(): wki=%d, wko=%04x, cda=%08x\n",
wki, wko, cda);
#endif
/*
* open the appropriate memory window and set our expectations...
*/
if (hc->mempages) {
SRC_SET_MEM(hc->iobase, sc->rxdesc);
SRC_SET_ON(hc->iobase);
}
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
endp = rxdesc;
rxdesc = &rxdesc[sc->rxhind];
endp = &endp[sc->rxmax];
*len = 0; /* reset result total length */
granules = 0; /* reset count of granules */
/*
* This loop will scan descriptors, but it *will* puke up if we wrap
* around to our starting point...
*/
while (rxdesc != cda) {
*len += rxdesc->len; /* increment result length */
granules++;
/*
* If we hit a valid packet's completion we'll know we've
* got a live one, and that we can deliver the packet.
* Since we're only allowed to report a packet available,
* somebody else does that...
*/
if (rxdesc->stat & SCA_DESC_EOM) { /* End Of Message */
*rxstat = rxdesc->stat; /* return closing */
#if BUGGY > 0
printf("sr%d: PKT AVAIL len %d, %x, bufs %u.\n",
sc->unit, *len, *rxstat, granules);
#endif
return 1; /* indicate success */
}
/*
* OK, this packet take up multiple granules. Move on to
* the next descriptor so we can consider it...
*/
rxdesc++;
if (rxdesc == endp) /* recognize & act on wrap point */
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
}
/*
* Nothing found in the DPRAM. Let the caller know...
*/
*len = 0;
*rxstat = 0;
return 0;
}
/*
* Copy a packet from the on card memory into a provided mbuf.
* Take into account that buffers wrap and that a packet may
* be larger than a buffer.
*/
static void
sr_copy_rxbuf(struct mbuf *m, struct sr_softc *sc, int len)
{
struct sr_hardc *hc;
sca_descriptor *rxdesc;
u_int rxdata;
u_int rxmax;
u_int off = 0;
u_int tlen;
#if BUGGY > 0
printf("sr_copy_rxbuf(m=%08x,sc=%08x,len=%d)\n",
m, sc, len);
#endif
hc = sc->hc;
rxdata = sc->rxstart + (sc->rxhind * SR_BUF_SIZ);
rxmax = sc->rxstart + (sc->rxmax * SR_BUF_SIZ);
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
rxdesc = &rxdesc[sc->rxhind];
/*
* Using the count of bytes in the received packet, we decrement it
* for each granule (controller by an SCA descriptor) to control the
* looping...
*/
while (len) {
/*
* tlen gets the length of *this* granule... ...which is
* then copied to the target buffer.
*/
tlen = (len < SR_BUF_SIZ) ? len : SR_BUF_SIZ;
if (hc->mempages)
SRC_SET_MEM(hc->iobase, rxdata);
bcopy(hc->mem_start + (rxdata & hc->winmsk),
mtod(m, caddr_t) +off,
tlen);
off += tlen;
len -= tlen;
/*
* now, return to the descriptor's window in DPRAM and reset
* the descriptor we've just suctioned...
*/
if (hc->mempages)
SRC_SET_MEM(hc->iobase, sc->rxdesc);
rxdesc->len = 0;
rxdesc->stat = 0xff;
/*
* Move on to the next granule. If we've any remaining
* bytes to process we'll just continue in our loop...
*/
rxdata += SR_BUF_SIZ;
rxdesc++;
if (rxdata == rxmax) { /* handle the wrap point */
rxdata = sc->rxstart;
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
}
}
}
/*
* If single is set, just eat a packet. Otherwise eat everything up to
* where cda points. Update pointers to point to the next packet.
*
* This handles "flushing" of a packet as received...
*
* If the "single" parameter is zero, all pending reeceive traffic will
* be flushed out of existence. A non-zero value will only drop the
* *next* (currently) pending packet...
*/
static void
sr_eat_packet(struct sr_softc *sc, int single)
{
struct sr_hardc *hc;
sca_descriptor *rxdesc; /* current descriptor being eval'd */
sca_descriptor *endp; /* last descriptor in chain */
sca_descriptor *cda; /* current start point */
u_int loopcnt = 0; /* count of packets flushed ??? */
u_char stat; /* captured status byte from descr */
hc = sc->hc;
cda = (sca_descriptor *)(hc->mem_start +
(SRC_GET16(hc->sca_base,
hc->sca->dmac[DMAC_RXCH(sc->scachan)].cda) &
hc->winmsk));
/*
* loop until desc->stat == (0xff || EOM) Clear the status and
* length in the descriptor. Increment the descriptor.
*/
if (hc->mempages)
SRC_SET_MEM(hc->iobase, sc->rxdesc);
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
endp = rxdesc;
rxdesc = &rxdesc[sc->rxhind];
endp = &endp[sc->rxmax];
/*
* allow loop, but abort it if we wrap completely...
*/
while (rxdesc != cda) {
loopcnt++;
if (loopcnt > sc->rxmax) {
printf("sr%d: eat pkt %d loop, cda %x, "
"rxdesc %x, stat %x.\n",
sc->unit, loopcnt, (u_int) cda, (u_int) rxdesc,
rxdesc->stat);
break;
}
stat = rxdesc->stat;
rxdesc->len = 0;
rxdesc->stat = 0xff;
rxdesc++;
sc->rxhind++;
if (rxdesc == endp) {
rxdesc = (sca_descriptor *)
(hc->mem_start + (sc->rxdesc & hc->winmsk));
sc->rxhind = 0;
}
if (single && (stat == SCA_DESC_EOM))
break;
}
/*
* Update the eda to the previous descriptor.
*/
rxdesc = (sca_descriptor *)sc->rxdesc;
rxdesc = &rxdesc[(sc->rxhind + sc->rxmax - 2) % sc->rxmax];
SRC_PUT16(hc->sca_base,
hc->sca->dmac[DMAC_RXCH(sc->scachan)].eda,
(u_short)((u_int)(rxdesc + hc->mem_pstart) & 0xffff));
}
/*
* While there is packets available in the rx buffer, read them out
* into mbufs and ship them off.
*/
static void
sr_get_packets(struct sr_softc *sc)
{
u_char rxstat; /* acquired status byte */
int i;
int pkts; /* count of packets found */
int rxndx; /* rcv buffer index */
int tries; /* settling time counter */
u_int len; /* length of pending packet */
struct sr_hardc *hc; /* card-level information */
sca_descriptor *rxdesc; /* descriptor in memory */
struct ifnet *ifp; /* network intf ctl table */
struct mbuf *m = NULL; /* message buffer */
#if BUGGY > 0
printf("sr_get_packets(sc=%08x)\n", sc);
#endif
hc = sc->hc;
ifp = &sc->ifsppp.pp_if;
if (hc->mempages) {
SRC_SET_MEM(hc->iobase, sc->rxdesc);
SRC_SET_ON(hc->iobase); /* enable shared memory */
}
pkts = 0; /* reset count of found packets */
/*
* for each complete packet in the receiving pool, process each
* packet...
*/
while (sr_packet_avail(sc, &len, &rxstat)) { /* packet pending? */
/*
* I have seen situations where we got the interrupt but the
* status value wasn't deposited. This code should allow
* the status byte's value to settle...
*/
tries = 5;
while ((rxstat == 0x00ff)
&& --tries)
sr_packet_avail(sc, &len, &rxstat);
#if BUGGY > 1
printf("sr_packet_avail() returned len=%d, rxstat=%02ux\n",
len, rxstat);
#endif
pkts++;
/*
* OK, we've settled the incoming message status. We can now
* process it...
*/
if (((rxstat & SCA_DESC_ERRORS) == 0) && (len < MCLBYTES)) {
#if BUGGY > 1
printf("sr%d: sr_get_packet() rxstat=%02x, len=%d\n",
sc->unit, rxstat, len);
#endif
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
/*
* eat (flush) packet if get mbuf fail!!
*/
sr_eat_packet(sc, 1);
continue;
}
/*
* construct control information for pass-off
*/
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
if (len > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
/*
* We couldn't get a big enough
* message packet, so we'll send the
* packet to /dev/null...
*/
m_freem(m);
sr_eat_packet(sc, 1);
continue;
}
}
/*
* OK, we've got a good message buffer. Now we can
* copy the received message into it
*/
sr_copy_rxbuf(m, sc, len); /* copy from DPRAM */
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp, m);
#endif
#if BUGGY > 3
{
u_char *bp;
bp = (u_char *)m;
printf("sr%d: rcvd=%02x%02x%02x%02x%02x%02x\n",
sc->unit,
bp[0], bp[1], bp[2],
bp[4], bp[5], bp[6]);
}
#endif
/*
* Pass off the message to PPP, connecting it it to
* the system...
*/
switch (sc->protocol) {
#if NFR > 0
case N2_USE_FRP:
fr_input(ifp, m);
break;
#endif
case N2_USE_PPP:
default:
sppp_input(ifp, m);
}
ifp->if_ipackets++;
/*
* Update the eda to the previous descriptor.
*/
i = (len + SR_BUF_SIZ - 1) / SR_BUF_SIZ;
sc->rxhind = (sc->rxhind + i) % sc->rxmax;
rxdesc = (sca_descriptor *)sc->rxdesc;
rxndx = (sc->rxhind + sc->rxmax - 2) % sc->rxmax;
rxdesc = &rxdesc[rxndx];
SRC_PUT16(hc->sca_base,
hc->sca->dmac[DMAC_RXCH(sc->scachan)].eda,
(u_short)((u_int)(rxdesc + hc->mem_pstart)
& 0xffff));
} else {
int got_st3, got_cda, got_eda;
int tries = 5;
while((rxstat == 0xff) && --tries)
sr_packet_avail(sc, &len, &rxstat);
/*
* It look like we get an interrupt early
* sometimes and then the status is not
* filled in yet.
*/
if(tries && (tries != 5))
continue;
/*
* This chunk of code handles the error packets.
* We'll log them for posterity...
*/
sr_eat_packet(sc, 1);
ifp->if_ierrors++;
got_st3 = SRC_GET8(hc->sca_base,
hc->sca->msci[sc->scachan].st3);
got_cda = SRC_GET16(hc->sca_base,
hc->sca->dmac[DMAC_RXCH(sc->scachan)].cda);
got_eda = SRC_GET16(hc->sca_base,
hc->sca->dmac[DMAC_RXCH(sc->scachan)].eda);
#if BUGGY > 0
printf("sr%d: Receive error chan %d, "
"stat %02x, msci st3 %02x,"
"rxhind %d, cda %04x, eda %04x.\n",
sc->unit, sc->scachan, rxstat,
got_st3, sc->rxhind, got_cda, got_eda);
#endif
}
}
#if BUGGY > 0
printf("sr%d: sr_get_packets() found %d packet(s)\n",
sc->unit, pkts);
#endif
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
}
/*
* All DMA interrupts come here.
*
* Each channel has two interrupts.
* Interrupt A for errors and Interrupt B for normal stuff like end
* of transmit or receive dmas.
*/
static void
sr_dmac_intr(struct sr_hardc *hc, u_char isr1)
{
u_char dsr; /* contents of DMA Stat Reg */
u_char dotxstart; /* enables for tranmit part */
int mch; /* channel being processed */
struct sr_softc *sc; /* channel's softc structure */
sca_regs *sca = hc->sca;
dmac_channel *dmac; /* dma structure of chip */
#if BUGGY > 0
printf("sr_dmac_intr(hc=%08x,isr1=%04x)\n", hc, isr1);
#endif
mch = 0; /* assume chan0 on card */
dotxstart = isr1; /* copy for xmitter starts */
/*
* Shortcut if there is no interrupts for dma channel 0 or 1.
* Skip processing for channel 0 if no incoming hit
*/
if ((isr1 & 0x0F) == 0) {
mch = 1;
isr1 >>= 4;
}
do {
sc = &hc->sc[mch];
/*
* Transmit channel - DMA Status Register Evaluation
*/
if (isr1 & 0x0C) {
dmac = &sca->dmac[DMAC_TXCH(mch)];
/*
* get the DMA Status Register contents and write
* back to reset interrupt...
*/
dsr = SRC_GET8(hc->sca_base, dmac->dsr);
SRC_PUT8(hc->sca_base, dmac->dsr, dsr);
/*
* Check for (& process) a Counter overflow
*/
if (dsr & SCA_DSR_COF) {
printf("sr%d: TX DMA Counter overflow, "
"txpacket no %lu.\n",
sc->unit, sc->ifsppp.pp_if.if_opackets);
sc->ifsppp.pp_if.if_oerrors++;
}
/*
* Check for (& process) a Buffer overflow
*/
if (dsr & SCA_DSR_BOF) {
printf("sr%d: TX DMA Buffer overflow, "
"txpacket no %lu, dsr %02x, "
"cda %04x, eda %04x.\n",
sc->unit, sc->ifsppp.pp_if.if_opackets,
dsr,
SRC_GET16(hc->sca_base, dmac->cda),
SRC_GET16(hc->sca_base, dmac->eda));
sc->ifsppp.pp_if.if_oerrors++;
}
/*
* Check for (& process) an End of Transfer (OK)
*/
if (dsr & SCA_DSR_EOT) {
/*
* This should be the most common case.
*
* Clear the IFF_OACTIVE flag.
*
* Call srstart to start a new transmit if
* there is data to transmit.
*/
#if BUGGY > 0
printf("sr%d: TX Completed OK\n", sc->unit);
#endif
sc->xmit_busy = 0;
sc->ifsppp.pp_if.if_flags &= ~IFF_OACTIVE;
sc->ifsppp.pp_if.if_timer = 0;
if (sc->txb_inuse && --sc->txb_inuse)
sr_xmit(sc);
}
}
/*
* Receive channel processing of DMA Status Register
*/
if (isr1 & 0x03) {
dmac = &sca->dmac[DMAC_RXCH(mch)];
dsr = SRC_GET8(hc->sca_base, dmac->dsr);
SRC_PUT8(hc->sca_base, dmac->dsr, dsr);
/*
* End of frame processing (MSG OK?)
*/
if (dsr & SCA_DSR_EOM) {
#if BUGGY > 0
int tt, ind;
tt = sc->ifsppp.pp_if.if_ipackets;
ind = sc->rxhind;
#endif
sr_get_packets(sc);
#if BUGGY > 0
if (tt == sc->ifsppp.pp_if.if_ipackets) {
sca_descriptor *rxdesc;
int i;
printf("SR: RXINTR isr1 %x, dsr %x, "
"no data %d pkts, orxind %d.\n",
dotxstart, dsr, tt, ind);
printf("SR: rxdesc %x, rxstart %x, "
"rxend %x, rxhind %d, "
"rxmax %d.\n",
sc->rxdesc, sc->rxstart,
sc->rxend, sc->rxhind,
sc->rxmax);
printf("SR: cda %x, eda %x.\n",
SRC_GET16(hc->sca_base, dmac->cda),
SRC_GET16(hc->sca_base, dmac->eda));
if (hc->mempages) {
SRC_SET_ON(hc->iobase);
SRC_SET_MEM(hc->iobase, sc->rxdesc);
}
rxdesc = (sca_descriptor *)
(hc->mem_start +
(sc->rxdesc & hc->winmsk));
rxdesc = &rxdesc[sc->rxhind];
for (i = 0; i < 3; i++, rxdesc++)
printf("SR: rxdesc->stat %x, "
"len %d.\n",
rxdesc->stat,
rxdesc->len);
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
}
#endif
}
/*
* Check for Counter overflow
*/
if (dsr & SCA_DSR_COF) {
printf("sr%d: RX DMA Counter overflow, "
"rxpkts %lu.\n",
sc->unit, sc->ifsppp.pp_if.if_ipackets);
sc->ifsppp.pp_if.if_ierrors++;
}
/*
* Check for Buffer overflow
*/
if (dsr & SCA_DSR_BOF) {
printf("sr%d: RX DMA Buffer overflow, "
"rxpkts %lu, rxind %d, "
"cda %x, eda %x, dsr %x.\n",
sc->unit, sc->ifsppp.pp_if.if_ipackets,
sc->rxhind,
SRC_GET16(hc->sca_base, dmac->cda),
SRC_GET16(hc->sca_base, dmac->eda),
dsr);
/*
* Make sure we eat as many as possible.
* Then get the system running again.
*/
if (hc->mempages)
SRC_SET_ON(hc->iobase);
sr_eat_packet(sc, 0);
sc->ifsppp.pp_if.if_ierrors++;
SRC_PUT8(hc->sca_base,
sca->msci[mch].cmd,
SCA_CMD_RXMSGREJ);
SRC_PUT8(hc->sca_base, dmac->dsr, SCA_DSR_DE);
#if BUGGY > 0
printf("sr%d: RX DMA Buffer overflow, "
"rxpkts %lu, rxind %d, "
"cda %x, eda %x, dsr %x. After\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets,
sc->rxhind,
SRC_GET16(hc->sca_base, dmac->cda),
SRC_GET16(hc->sca_base, dmac->eda),
SRC_GET8(hc->sca_base, dmac->dsr));
#endif
if (hc->mempages)
SRC_SET_OFF(hc->iobase);
}
/*
* End of Transfer
*/
if (dsr & SCA_DSR_EOT) {
/*
* If this happen, it means that we are
* receiving faster than what the processor
* can handle.
*
* XXX We should enable the dma again.
*/
printf("sr%d: RX End of xfer, rxpkts %lu.\n",
sc->unit,
sc->ifsppp.pp_if.if_ipackets);
sc->ifsppp.pp_if.if_ierrors++;
}
}
isr1 >>= 4; /* process next half of ISR */
mch++; /* and move to next channel */
} while ((mch < NCHAN) && isr1); /* loop for each chn */
/*
* Now that we have done all the urgent things, see if we can fill
* the transmit buffers.
*/
for (mch = 0; mch < NCHAN; mch++) {
if (dotxstart & 0x0C) { /* TX initiation enabled? */
sc = &hc->sc[mch];
srstart(&sc->ifsppp.pp_if);
}
dotxstart >>= 4;/* shift for next channel */
}
}
/*
* Perform timeout on an FR channel
*
* Establish a periodic check of open N2 ports; If
* a port is open/active, it's DCD state is checked
* and a loss of DCD is recognized (and eventually
* processed).
*/
static void
sr_modemck(void *arg)
{
u_int s;
int card; /* card index in table */
int cards; /* card list index */
int mch; /* channel on card */
u_char dcd_v; /* Data Carrier Detect */
u_char got_st0; /* contents of ST0 */
u_char got_st1; /* contents of ST1 */
u_char got_st2; /* contents of ST2 */
u_char got_st3; /* contents of ST3 */
struct sr_hardc *hc; /* card's configuration */
struct sr_hardc *Card[16];/* up to 16 cards in system */
struct sr_softc *sc; /* channel's softc structure */
struct ifnet *ifp; /* interface control table */
msci_channel *msci; /* regs specific to channel */
s = splimp();
#if 0
if (sr_opens == 0) { /* count of "up" channels */
sr_watcher = 0; /* indicate no watcher */
splx(s);
return;
}
#endif
sr_watcher = 1; /* mark that we're online */
/*
* Now we'll need a list of cards to process. Since we can handle
* both ISA and PCI cards (and I didn't think of making this logic
* global YET) we'll generate a single table of card table
* addresses.
*/
cards = 0;
for (card = 0; card < NSR; card++) {
hc = &sr_hardc[card];
if (hc->sc == (void *)0)
continue;
Card[cards++] = hc;
}
hc = sr_hardc_pci;
while (hc) {
Card[cards++] = hc;
hc = hc->next;
}
/*
* OK, we've got work we can do. Let's do it... (Please note that
* this code _only_ deals w/ ISA cards)
*/
for (card = 0; card < cards; card++) {
hc = Card[card];/* get card table */
for (mch = 0; mch < hc->numports; mch++) {
sc = &hc->sc[mch];
if (sc->attached == 0)
continue;
ifp = &sc->ifsppp.pp_if;
/*
* if this channel isn't "up", skip it
*/
if ((ifp->if_flags & IFF_UP) == 0)
continue;
/*
* OK, now we can go looking at this channel's
* actual register contents...
*/
msci = &hc->sca->msci[sc->scachan];
/*
* OK, now we'll look into the actual status of this
* channel...
*
* I suck in more registers than strictly needed
*/
got_st0 = SRC_GET8(hc->sca_base, msci->st0);
got_st1 = SRC_GET8(hc->sca_base, msci->st1);
got_st2 = SRC_GET8(hc->sca_base, msci->st2);
got_st3 = SRC_GET8(hc->sca_base, msci->st3);
/*
* We want to see if the DCD signal is up (DCD is
* true if zero)
*/
dcd_v = (got_st3 & SCA_ST3_DCD) == 0;
if (dcd_v == 0)
printf("sr%d: DCD lost\n", sc->unit);
}
}
/*
* OK, now set up for the next modem signal checking pass...
*/
timeout(sr_modemck, NULL, hz);
splx(s);
}
static void
sr_msci_intr(struct sr_hardc *hc, u_char isr0)
{
printf("src%d: SRINTR: MSCI\n", hc->cunit);
}
static void
sr_timer_intr(struct sr_hardc *hc, u_char isr2)
{
printf("src%d: SRINTR: TIMER\n", hc->cunit);
}
/*
********************************* END ************************************
*/
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