diff options
Diffstat (limited to 'drivers/isdn/hisax/hisax_isac.c')
| -rw-r--r-- | drivers/isdn/hisax/hisax_isac.c | 895 |
1 files changed, 895 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/hisax_isac.c b/drivers/isdn/hisax/hisax_isac.c new file mode 100644 index 000000000..5154c252a --- /dev/null +++ b/drivers/isdn/hisax/hisax_isac.c @@ -0,0 +1,895 @@ +/* + * 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; + } + memcpy(skb_put(skb, count), 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; + } + memcpy(skb_put(skb, count), 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); |