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linux/drivers/isdn/hisax/hisax_isac.c
Johannes Berg 59ae1d127a networking: introduce and use skb_put_data() 
A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.

An spatch similar to the one for skb_put_zero() converts many
of the places using it:

    @@
    identifier p, p2;
    expression len, skb, data;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_data(skb, data, len);
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, len);
    |
    -memcpy(p, data, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb, data;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_data(skb, data, sizeof(t));
    )
    (
    p2 = (t2)p;
    -memcpy(p2, data, sizeof(*p));
    |
    -memcpy(p, data, sizeof(*p));
    )

    @@
    expression skb, len, data;
    @@
    -memcpy(skb_put(skb, len), data, len);
    +skb_put_data(skb, data, len);

(again, manually post-processed to retain some comments)

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:37 -04:00

896 lines
22 KiB
C
Raw Blame History

/*
* Driver for ISAC-S and ISAC-SX
* ISDN Subscriber Access Controller for Terminals
*
* Author Kai Germaschewski
* Copyright 2001 by Kai Germaschewski <kai.germaschewski@gmx.de>
* 2001 by Karsten Keil <keil@isdn4linux.de>
*
* based upon Karsten Keil's original isac.c driver
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* Thanks to Wizard Computersysteme GmbH, Bremervoerde and
* SoHaNet Technology GmbH, Berlin
* for supporting the development of this driver
*/
/* TODO:
* specifically handle level vs edge triggered?
*/
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include "hisax_isac.h"
// debugging cruft
#define __debug_variable debug
#include "hisax_debug.h"
#ifdef CONFIG_HISAX_DEBUG
static int debug = 1;
module_param(debug, int, 0);
static char *ISACVer[] = {
"2086/2186 V1.1",
"2085 B1",
"2085 B2",
"2085 V2.3"
};
#endif
MODULE_AUTHOR("Kai Germaschewski <kai.germaschewski@gmx.de>/Karsten Keil <kkeil@suse.de>");
MODULE_DESCRIPTION("ISAC/ISAC-SX driver");
MODULE_LICENSE("GPL");
#define DBG_WARN 0x0001
#define DBG_IRQ 0x0002
#define DBG_L1M 0x0004
#define DBG_PR 0x0008
#define DBG_RFIFO 0x0100
#define DBG_RPACKET 0x0200
#define DBG_XFIFO 0x1000
#define DBG_XPACKET 0x2000
// we need to distinguish ISAC-S and ISAC-SX
#define TYPE_ISAC 0x00
#define TYPE_ISACSX 0x01
// registers etc.
#define ISAC_MASK 0x20
#define ISAC_ISTA 0x20
#define ISAC_ISTA_EXI 0x01
#define ISAC_ISTA_SIN 0x02
#define ISAC_ISTA_CISQ 0x04
#define ISAC_ISTA_XPR 0x10
#define ISAC_ISTA_RSC 0x20
#define ISAC_ISTA_RPF 0x40
#define ISAC_ISTA_RME 0x80
#define ISAC_STAR 0x21
#define ISAC_CMDR 0x21
#define ISAC_CMDR_XRES 0x01
#define ISAC_CMDR_XME 0x02
#define ISAC_CMDR_XTF 0x08
#define ISAC_CMDR_RRES 0x40
#define ISAC_CMDR_RMC 0x80
#define ISAC_EXIR 0x24
#define ISAC_EXIR_MOS 0x04
#define ISAC_EXIR_XDU 0x40
#define ISAC_EXIR_XMR 0x80
#define ISAC_ADF2 0x39
#define ISAC_SPCR 0x30
#define ISAC_ADF1 0x38
#define ISAC_CIR0 0x31
#define ISAC_CIX0 0x31
#define ISAC_CIR0_CIC0 0x02
#define ISAC_CIR0_CIC1 0x01
#define ISAC_CIR1 0x33
#define ISAC_CIX1 0x33
#define ISAC_STCR 0x37
#define ISAC_MODE 0x22
#define ISAC_RSTA 0x27
#define ISAC_RSTA_RDO 0x40
#define ISAC_RSTA_CRC 0x20
#define ISAC_RSTA_RAB 0x10
#define ISAC_RBCL 0x25
#define ISAC_RBCH 0x2A
#define ISAC_TIMR 0x23
#define ISAC_SQXR 0x3b
#define ISAC_MOSR 0x3a
#define ISAC_MOCR 0x3a
#define ISAC_MOR0 0x32
#define ISAC_MOX0 0x32
#define ISAC_MOR1 0x34
#define ISAC_MOX1 0x34
#define ISAC_RBCH_XAC 0x80
#define ISAC_CMD_TIM 0x0
#define ISAC_CMD_RES 0x1
#define ISAC_CMD_SSP 0x2
#define ISAC_CMD_SCP 0x3
#define ISAC_CMD_AR8 0x8
#define ISAC_CMD_AR10 0x9
#define ISAC_CMD_ARL 0xa
#define ISAC_CMD_DI 0xf
#define ISACSX_MASK 0x60
#define ISACSX_ISTA 0x60
#define ISACSX_ISTA_ICD 0x01
#define ISACSX_ISTA_CIC 0x10
#define ISACSX_MASKD 0x20
#define ISACSX_ISTAD 0x20
#define ISACSX_ISTAD_XDU 0x04
#define ISACSX_ISTAD_XMR 0x08
#define ISACSX_ISTAD_XPR 0x10
#define ISACSX_ISTAD_RFO 0x20
#define ISACSX_ISTAD_RPF 0x40
#define ISACSX_ISTAD_RME 0x80
#define ISACSX_CMDRD 0x21
#define ISACSX_CMDRD_XRES 0x01
#define ISACSX_CMDRD_XME 0x02
#define ISACSX_CMDRD_XTF 0x08
#define ISACSX_CMDRD_RRES 0x40
#define ISACSX_CMDRD_RMC 0x80
#define ISACSX_MODED 0x22
#define ISACSX_RBCLD 0x26
#define ISACSX_RSTAD 0x28
#define ISACSX_RSTAD_RAB 0x10
#define ISACSX_RSTAD_CRC 0x20
#define ISACSX_RSTAD_RDO 0x40
#define ISACSX_RSTAD_VFR 0x80
#define ISACSX_CIR0 0x2e
#define ISACSX_CIR0_CIC0 0x08
#define ISACSX_CIX0 0x2e
#define ISACSX_TR_CONF0 0x30
#define ISACSX_TR_CONF2 0x32
static struct Fsm l1fsm;
enum {
ST_L1_RESET,
ST_L1_F3_PDOWN,
ST_L1_F3_PUP,
ST_L1_F3_PEND_DEACT,
ST_L1_F4,
ST_L1_F5,
ST_L1_F6,
ST_L1_F7,
ST_L1_F8,
};
#define L1_STATE_COUNT (ST_L1_F8 + 1)
static char *strL1State[] =
{
"ST_L1_RESET",
"ST_L1_F3_PDOWN",
"ST_L1_F3_PUP",
"ST_L1_F3_PEND_DEACT",
"ST_L1_F4",
"ST_L1_F5",
"ST_L1_F6",
"ST_L1_F7",
"ST_L1_F8",
};
enum {
EV_PH_DR, // 0000
EV_PH_RES, // 0001
EV_PH_TMA, // 0010
EV_PH_SLD, // 0011
EV_PH_RSY, // 0100
EV_PH_DR6, // 0101
EV_PH_EI, // 0110
EV_PH_PU, // 0111
EV_PH_AR, // 1000
EV_PH_9, // 1001
EV_PH_ARL, // 1010
EV_PH_CVR, // 1011
EV_PH_AI8, // 1100
EV_PH_AI10, // 1101
EV_PH_AIL, // 1110
EV_PH_DC, // 1111
EV_PH_ACTIVATE_REQ,
EV_PH_DEACTIVATE_REQ,
EV_TIMER3,
};
#define L1_EVENT_COUNT (EV_TIMER3 + 1)
static char *strL1Event[] =
{
"EV_PH_DR", // 0000
"EV_PH_RES", // 0001
"EV_PH_TMA", // 0010
"EV_PH_SLD", // 0011
"EV_PH_RSY", // 0100
"EV_PH_DR6", // 0101
"EV_PH_EI", // 0110
"EV_PH_PU", // 0111
"EV_PH_AR", // 1000
"EV_PH_9", // 1001
"EV_PH_ARL", // 1010
"EV_PH_CVR", // 1011
"EV_PH_AI8", // 1100
"EV_PH_AI10", // 1101
"EV_PH_AIL", // 1110
"EV_PH_DC", // 1111
"EV_PH_ACTIVATE_REQ",
"EV_PH_DEACTIVATE_REQ",
"EV_TIMER3",
};
static inline void D_L1L2(struct isac *isac, int pr, void *arg)
{
struct hisax_if *ifc = (struct hisax_if *) &isac->hisax_d_if;
DBG(DBG_PR, "pr %#x", pr);
ifc->l1l2(ifc, pr, arg);
}
static void ph_command(struct isac *isac, unsigned int command)
{
DBG(DBG_L1M, "ph_command %#x", command);
switch (isac->type) {
case TYPE_ISAC:
isac->write_isac(isac, ISAC_CIX0, (command << 2) | 3);
break;
case TYPE_ISACSX:
isac->write_isac(isac, ISACSX_CIX0, (command << 4) | (7 << 1));
break;
}
}
// ----------------------------------------------------------------------
static void l1_di(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_RESET);
ph_command(isac, ISAC_CMD_DI);
}
static void l1_di_deact_ind(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_RESET);
D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
ph_command(isac, ISAC_CMD_DI);
}
static void l1_go_f3pdown(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L1_F3_PDOWN);
}
static void l1_go_f3pend_deact_ind(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
ph_command(isac, ISAC_CMD_DI);
}
static void l1_go_f3pend(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
ph_command(isac, ISAC_CMD_DI);
}
static void l1_go_f4(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L1_F4);
}
static void l1_go_f5(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L1_F5);
}
static void l1_go_f6(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L1_F6);
}
static void l1_go_f6_deact_ind(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_F6);
D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
}
static void l1_go_f7_act_ind(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmDelTimer(&isac->timer, 0);
FsmChangeState(fi, ST_L1_F7);
ph_command(isac, ISAC_CMD_AR8);
D_L1L2(isac, PH_ACTIVATE | INDICATION, NULL);
}
static void l1_go_f8(struct FsmInst *fi, int event, void *arg)
{
FsmChangeState(fi, ST_L1_F8);
}
static void l1_go_f8_deact_ind(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmChangeState(fi, ST_L1_F8);
D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
}
static void l1_ar8(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
FsmRestartTimer(&isac->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
ph_command(isac, ISAC_CMD_AR8);
}
static void l1_timer3(struct FsmInst *fi, int event, void *arg)
{
struct isac *isac = fi->userdata;
ph_command(isac, ISAC_CMD_DI);
D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
}
// state machines according to data sheet PSB 2186 / 3186
static struct FsmNode L1FnList[] __initdata =
{
{ST_L1_RESET, EV_PH_RES, l1_di},
{ST_L1_RESET, EV_PH_EI, l1_di},
{ST_L1_RESET, EV_PH_DC, l1_go_f3pdown},
{ST_L1_RESET, EV_PH_AR, l1_go_f6},
{ST_L1_RESET, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F3_PDOWN, EV_PH_RES, l1_di},
{ST_L1_F3_PDOWN, EV_PH_EI, l1_di},
{ST_L1_F3_PDOWN, EV_PH_AR, l1_go_f6},
{ST_L1_F3_PDOWN, EV_PH_RSY, l1_go_f5},
{ST_L1_F3_PDOWN, EV_PH_PU, l1_go_f4},
{ST_L1_F3_PDOWN, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F3_PDOWN, EV_PH_ACTIVATE_REQ, l1_ar8},
{ST_L1_F3_PDOWN, EV_TIMER3, l1_timer3},
{ST_L1_F3_PEND_DEACT, EV_PH_RES, l1_di},
{ST_L1_F3_PEND_DEACT, EV_PH_EI, l1_di},
{ST_L1_F3_PEND_DEACT, EV_PH_DC, l1_go_f3pdown},
{ST_L1_F3_PEND_DEACT, EV_PH_RSY, l1_go_f5},
{ST_L1_F3_PEND_DEACT, EV_PH_AR, l1_go_f6},
{ST_L1_F3_PEND_DEACT, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F4, EV_PH_RES, l1_di},
{ST_L1_F4, EV_PH_EI, l1_di},
{ST_L1_F4, EV_PH_RSY, l1_go_f5},
{ST_L1_F4, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F4, EV_TIMER3, l1_timer3},
{ST_L1_F4, EV_PH_DC, l1_go_f3pdown},
{ST_L1_F5, EV_PH_RES, l1_di},
{ST_L1_F5, EV_PH_EI, l1_di},
{ST_L1_F5, EV_PH_AR, l1_go_f6},
{ST_L1_F5, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F5, EV_TIMER3, l1_timer3},
{ST_L1_F5, EV_PH_DR, l1_go_f3pend},
{ST_L1_F5, EV_PH_DC, l1_go_f3pdown},
{ST_L1_F6, EV_PH_RES, l1_di},
{ST_L1_F6, EV_PH_EI, l1_di},
{ST_L1_F6, EV_PH_RSY, l1_go_f8},
{ST_L1_F6, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F6, EV_PH_DR6, l1_go_f3pend},
{ST_L1_F6, EV_TIMER3, l1_timer3},
{ST_L1_F6, EV_PH_DC, l1_go_f3pdown},
{ST_L1_F7, EV_PH_RES, l1_di_deact_ind},
{ST_L1_F7, EV_PH_EI, l1_di_deact_ind},
{ST_L1_F7, EV_PH_AR, l1_go_f6_deact_ind},
{ST_L1_F7, EV_PH_RSY, l1_go_f8_deact_ind},
{ST_L1_F7, EV_PH_DR, l1_go_f3pend_deact_ind},
{ST_L1_F8, EV_PH_RES, l1_di},
{ST_L1_F8, EV_PH_EI, l1_di},
{ST_L1_F8, EV_PH_AR, l1_go_f6},
{ST_L1_F8, EV_PH_DR, l1_go_f3pend},
{ST_L1_F8, EV_PH_AI8, l1_go_f7_act_ind},
{ST_L1_F8, EV_TIMER3, l1_timer3},
{ST_L1_F8, EV_PH_DC, l1_go_f3pdown},
};
static void l1m_debug(struct FsmInst *fi, char *fmt, ...)
{
va_list args;
char buf[256];
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
DBG(DBG_L1M, "%s", buf);
va_end(args);
}
static void isac_version(struct isac *cs)
{
int val;
val = cs->read_isac(cs, ISAC_RBCH);
DBG(1, "ISAC version (%x): %s", val, ISACVer[(val >> 5) & 3]);
}
static void isac_empty_fifo(struct isac *isac, int count)
{
// this also works for isacsx, since
// CMDR(D) register works the same
u_char *ptr;
DBG(DBG_IRQ, "count %d", count);
if ((isac->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
DBG(DBG_WARN, "overrun %d", isac->rcvidx + count);
isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
isac->rcvidx = 0;
return;
}
ptr = isac->rcvbuf + isac->rcvidx;
isac->rcvidx += count;
isac->read_isac_fifo(isac, ptr, count);
isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
DBG_PACKET(DBG_RFIFO, ptr, count);
}
static void isac_fill_fifo(struct isac *isac)
{
// this also works for isacsx, since
// CMDR(D) register works the same
int count;
unsigned char cmd;
u_char *ptr;
BUG_ON(!isac->tx_skb);
count = isac->tx_skb->len;
BUG_ON(count <= 0);
DBG(DBG_IRQ, "count %d", count);
if (count > 0x20) {
count = 0x20;
cmd = ISAC_CMDR_XTF;
} else {
cmd = ISAC_CMDR_XTF | ISAC_CMDR_XME;
}
ptr = isac->tx_skb->data;
skb_pull(isac->tx_skb, count);
isac->tx_cnt += count;
DBG_PACKET(DBG_XFIFO, ptr, count);
isac->write_isac_fifo(isac, ptr, count);
isac->write_isac(isac, ISAC_CMDR, cmd);
}
static void isac_retransmit(struct isac *isac)
{
if (!isac->tx_skb) {
DBG(DBG_WARN, "no skb");
return;
}
skb_push(isac->tx_skb, isac->tx_cnt);
isac->tx_cnt = 0;
}
static inline void isac_cisq_interrupt(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISAC_CIR0);
DBG(DBG_IRQ, "CIR0 %#x", val);
if (val & ISAC_CIR0_CIC0) {
DBG(DBG_IRQ, "CODR0 %#x", (val >> 2) & 0xf);
FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
}
if (val & ISAC_CIR0_CIC1) {
val = isac->read_isac(isac, ISAC_CIR1);
DBG(DBG_WARN, "ISAC CIR1 %#x", val);
}
}
static inline void isac_rme_interrupt(struct isac *isac)
{
unsigned char val;
int count;
struct sk_buff *skb;
val = isac->read_isac(isac, ISAC_RSTA);
if ((val & (ISAC_RSTA_RDO | ISAC_RSTA_CRC | ISAC_RSTA_RAB))
!= ISAC_RSTA_CRC) {
DBG(DBG_WARN, "RSTA %#x, dropped", val);
isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
goto out;
}
count = isac->read_isac(isac, ISAC_RBCL) & 0x1f;
DBG(DBG_IRQ, "RBCL %#x", count);
if (count == 0)
count = 0x20;
isac_empty_fifo(isac, count);
count = isac->rcvidx;
if (count < 1) {
DBG(DBG_WARN, "count %d < 1", count);
goto out;
}
skb = alloc_skb(count, GFP_ATOMIC);
if (!skb) {
DBG(DBG_WARN, "no memory, dropping\n");
goto out;
}
skb_put_data(skb, isac->rcvbuf, count);
DBG_SKB(DBG_RPACKET, skb);
D_L1L2(isac, PH_DATA | INDICATION, skb);
out:
isac->rcvidx = 0;
}
static inline void isac_xpr_interrupt(struct isac *isac)
{
if (!isac->tx_skb)
return;
if (isac->tx_skb->len > 0) {
isac_fill_fifo(isac);
return;
}
dev_kfree_skb_irq(isac->tx_skb);
isac->tx_cnt = 0;
isac->tx_skb = NULL;
D_L1L2(isac, PH_DATA | CONFIRM, NULL);
}
static inline void isac_exi_interrupt(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISAC_EXIR);
DBG(2, "EXIR %#x", val);
if (val & ISAC_EXIR_XMR) {
DBG(DBG_WARN, "ISAC XMR");
isac_retransmit(isac);
}
if (val & ISAC_EXIR_XDU) {
DBG(DBG_WARN, "ISAC XDU");
isac_retransmit(isac);
}
if (val & ISAC_EXIR_MOS) { /* MOS */
DBG(DBG_WARN, "MOS");
val = isac->read_isac(isac, ISAC_MOSR);
DBG(2, "ISAC MOSR %#x", val);
}
}
void isac_irq(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISAC_ISTA);
DBG(DBG_IRQ, "ISTA %#x", val);
if (val & ISAC_ISTA_EXI) {
DBG(DBG_IRQ, "EXI");
isac_exi_interrupt(isac);
}
if (val & ISAC_ISTA_XPR) {
DBG(DBG_IRQ, "XPR");
isac_xpr_interrupt(isac);
}
if (val & ISAC_ISTA_RME) {
DBG(DBG_IRQ, "RME");
isac_rme_interrupt(isac);
}
if (val & ISAC_ISTA_RPF) {
DBG(DBG_IRQ, "RPF");
isac_empty_fifo(isac, 0x20);
}
if (val & ISAC_ISTA_CISQ) {
DBG(DBG_IRQ, "CISQ");
isac_cisq_interrupt(isac);
}
if (val & ISAC_ISTA_RSC) {
DBG(DBG_WARN, "RSC");
}
if (val & ISAC_ISTA_SIN) {
DBG(DBG_WARN, "SIN");
}
isac->write_isac(isac, ISAC_MASK, 0xff);
isac->write_isac(isac, ISAC_MASK, 0x00);
}
// ======================================================================
static inline void isacsx_cic_interrupt(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISACSX_CIR0);
DBG(DBG_IRQ, "CIR0 %#x", val);
if (val & ISACSX_CIR0_CIC0) {
DBG(DBG_IRQ, "CODR0 %#x", val >> 4);
FsmEvent(&isac->l1m, val >> 4, NULL);
}
}
static inline void isacsx_rme_interrupt(struct isac *isac)
{
int count;
struct sk_buff *skb;
unsigned char val;
val = isac->read_isac(isac, ISACSX_RSTAD);
if ((val & (ISACSX_RSTAD_VFR |
ISACSX_RSTAD_RDO |
ISACSX_RSTAD_CRC |
ISACSX_RSTAD_RAB))
!= (ISACSX_RSTAD_VFR | ISACSX_RSTAD_CRC)) {
DBG(DBG_WARN, "RSTAD %#x, dropped", val);
isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
goto out;
}
count = isac->read_isac(isac, ISACSX_RBCLD) & 0x1f;
DBG(DBG_IRQ, "RBCLD %#x", count);
if (count == 0)
count = 0x20;
isac_empty_fifo(isac, count);
// strip trailing status byte
count = isac->rcvidx - 1;
if (count < 1) {
DBG(DBG_WARN, "count %d < 1", count);
goto out;
}
skb = dev_alloc_skb(count);
if (!skb) {
DBG(DBG_WARN, "no memory, dropping");
goto out;
}
skb_put_data(skb, isac->rcvbuf, count);
DBG_SKB(DBG_RPACKET, skb);
D_L1L2(isac, PH_DATA | INDICATION, skb);
out:
isac->rcvidx = 0;
}
static inline void isacsx_xpr_interrupt(struct isac *isac)
{
if (!isac->tx_skb)
return;
if (isac->tx_skb->len > 0) {
isac_fill_fifo(isac);
return;
}
dev_kfree_skb_irq(isac->tx_skb);
isac->tx_skb = NULL;
isac->tx_cnt = 0;
D_L1L2(isac, PH_DATA | CONFIRM, NULL);
}
static inline void isacsx_icd_interrupt(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISACSX_ISTAD);
DBG(DBG_IRQ, "ISTAD %#x", val);
if (val & ISACSX_ISTAD_XDU) {
DBG(DBG_WARN, "ISTAD XDU");
isac_retransmit(isac);
}
if (val & ISACSX_ISTAD_XMR) {
DBG(DBG_WARN, "ISTAD XMR");
isac_retransmit(isac);
}
if (val & ISACSX_ISTAD_XPR) {
DBG(DBG_IRQ, "ISTAD XPR");
isacsx_xpr_interrupt(isac);
}
if (val & ISACSX_ISTAD_RFO) {
DBG(DBG_WARN, "ISTAD RFO");
isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
}
if (val & ISACSX_ISTAD_RME) {
DBG(DBG_IRQ, "ISTAD RME");
isacsx_rme_interrupt(isac);
}
if (val & ISACSX_ISTAD_RPF) {
DBG(DBG_IRQ, "ISTAD RPF");
isac_empty_fifo(isac, 0x20);
}
}
void isacsx_irq(struct isac *isac)
{
unsigned char val;
val = isac->read_isac(isac, ISACSX_ISTA);
DBG(DBG_IRQ, "ISTA %#x", val);
if (val & ISACSX_ISTA_ICD)
isacsx_icd_interrupt(isac);
if (val & ISACSX_ISTA_CIC)
isacsx_cic_interrupt(isac);
}
void isac_init(struct isac *isac)
{
isac->tx_skb = NULL;
isac->l1m.fsm = &l1fsm;
isac->l1m.state = ST_L1_RESET;
#ifdef CONFIG_HISAX_DEBUG
isac->l1m.debug = 1;
#else
isac->l1m.debug = 0;
#endif
isac->l1m.userdata = isac;
isac->l1m.printdebug = l1m_debug;
FsmInitTimer(&isac->l1m, &isac->timer);
}
void isac_setup(struct isac *isac)
{
int val, eval;
isac->type = TYPE_ISAC;
isac_version(isac);
ph_command(isac, ISAC_CMD_RES);
isac->write_isac(isac, ISAC_MASK, 0xff);
isac->mocr = 0xaa;
if (test_bit(ISAC_IOM1, &isac->flags)) {
/* IOM 1 Mode */
isac->write_isac(isac, ISAC_ADF2, 0x0);
isac->write_isac(isac, ISAC_SPCR, 0xa);
isac->write_isac(isac, ISAC_ADF1, 0x2);
isac->write_isac(isac, ISAC_STCR, 0x70);
isac->write_isac(isac, ISAC_MODE, 0xc9);
} else {
/* IOM 2 Mode */
if (!isac->adf2)
isac->adf2 = 0x80;
isac->write_isac(isac, ISAC_ADF2, isac->adf2);
isac->write_isac(isac, ISAC_SQXR, 0x2f);
isac->write_isac(isac, ISAC_SPCR, 0x00);
isac->write_isac(isac, ISAC_STCR, 0x70);
isac->write_isac(isac, ISAC_MODE, 0xc9);
isac->write_isac(isac, ISAC_TIMR, 0x00);
isac->write_isac(isac, ISAC_ADF1, 0x00);
}
val = isac->read_isac(isac, ISAC_STAR);
DBG(2, "ISAC STAR %x", val);
val = isac->read_isac(isac, ISAC_MODE);
DBG(2, "ISAC MODE %x", val);
val = isac->read_isac(isac, ISAC_ADF2);
DBG(2, "ISAC ADF2 %x", val);
val = isac->read_isac(isac, ISAC_ISTA);
DBG(2, "ISAC ISTA %x", val);
if (val & 0x01) {
eval = isac->read_isac(isac, ISAC_EXIR);
DBG(2, "ISAC EXIR %x", eval);
}
val = isac->read_isac(isac, ISAC_CIR0);
DBG(2, "ISAC CIR0 %x", val);
FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
isac->write_isac(isac, ISAC_MASK, 0x0);
// RESET Receiver and Transmitter
isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_XRES | ISAC_CMDR_RRES);
}
void isacsx_setup(struct isac *isac)
{
isac->type = TYPE_ISACSX;
// clear LDD
isac->write_isac(isac, ISACSX_TR_CONF0, 0x00);
// enable transmitter
isac->write_isac(isac, ISACSX_TR_CONF2, 0x00);
// transparent mode 0, RAC, stop/go
isac->write_isac(isac, ISACSX_MODED, 0xc9);
// all HDLC IRQ unmasked
isac->write_isac(isac, ISACSX_MASKD, 0x03);
// unmask ICD, CID IRQs
isac->write_isac(isac, ISACSX_MASK,
~(ISACSX_ISTA_ICD | ISACSX_ISTA_CIC));
}
void isac_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
{
struct isac *isac = hisax_d_if->priv;
struct sk_buff *skb = arg;
DBG(DBG_PR, "pr %#x", pr);
switch (pr) {
case PH_ACTIVATE | REQUEST:
FsmEvent(&isac->l1m, EV_PH_ACTIVATE_REQ, NULL);
break;
case PH_DEACTIVATE | REQUEST:
FsmEvent(&isac->l1m, EV_PH_DEACTIVATE_REQ, NULL);
break;
case PH_DATA | REQUEST:
DBG(DBG_PR, "PH_DATA REQUEST len %d", skb->len);
DBG_SKB(DBG_XPACKET, skb);
if (isac->l1m.state != ST_L1_F7) {
DBG(1, "L1 wrong state %d\n", isac->l1m.state);
dev_kfree_skb(skb);
break;
}
BUG_ON(isac->tx_skb);
isac->tx_skb = skb;
isac_fill_fifo(isac);
break;
}
}
static int __init hisax_isac_init(void)
{
printk(KERN_INFO "hisax_isac: ISAC-S/ISAC-SX ISDN driver v0.1.0\n");
l1fsm.state_count = L1_STATE_COUNT;
l1fsm.event_count = L1_EVENT_COUNT;
l1fsm.strState = strL1State;
l1fsm.strEvent = strL1Event;
return FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
}
static void __exit hisax_isac_exit(void)
{
FsmFree(&l1fsm);
}
EXPORT_SYMBOL(isac_init);
EXPORT_SYMBOL(isac_d_l2l1);
EXPORT_SYMBOL(isacsx_setup);
EXPORT_SYMBOL(isacsx_irq);
EXPORT_SYMBOL(isac_setup);
EXPORT_SYMBOL(isac_irq);
module_init(hisax_isac_init);
module_exit(hisax_isac_exit);
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