mantis_hif.c

Go to the documentation of this file.

/*
    Mantis PCI bridge driver

    Copyright (C) Manu Abraham ([email protected])

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>

#include <linux/interrupt.h>
#include <asm/io.h>

#include "dmxdev.h"
#include "dvbdev.h"
#include "dvb_demux.h"
#include "dvb_frontend.h"
#include "dvb_net.h"

#include "mantis_common.h"

#include "mantis_hif.h"
#include "mantis_link.h" /* temporary due to physical layer stuff */

#include "mantis_reg.h"


static int mantis_hif_sbuf_opdone_wait(struct mantis_ca *ca)
{
    struct mantis_pci *mantis = ca->ca_priv;
    int rc = 0;

    if (wait_event_timeout(ca->hif_opdone_wq,
                   ca->hif_event & MANTIS_SBUF_OPDONE,
                   msecs_to_jiffies(500)) == -ERESTARTSYS) {

        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): Smart buffer operation timeout !", mantis->num);
        rc = -EREMOTEIO;
    }
    dprintk(MANTIS_DEBUG, 1, "Smart Buffer Operation complete");
    ca->hif_event &= ~MANTIS_SBUF_OPDONE;
    return rc;
}

static int mantis_hif_write_wait(struct mantis_ca *ca)
{
    struct mantis_pci *mantis = ca->ca_priv;
    u32 opdone = 0, timeout = 0;
    int rc = 0;

    if (wait_event_timeout(ca->hif_write_wq,
                   mantis->gpif_status & MANTIS_GPIF_WRACK,
                   msecs_to_jiffies(500)) == -ERESTARTSYS) {

        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): Write ACK timed out !", mantis->num);
        rc = -EREMOTEIO;
    }
    dprintk(MANTIS_DEBUG, 1, "Write Acknowledged");
    mantis->gpif_status &= ~MANTIS_GPIF_WRACK;
    while (!opdone) {
        opdone = (mmread(MANTIS_GPIF_STATUS) & MANTIS_SBUF_OPDONE);
        udelay(500);
        timeout++;
        if (timeout > 100) {
            dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): Write operation timed out!", mantis->num);
            rc = -ETIMEDOUT;
            break;
        }
    }
    dprintk(MANTIS_DEBUG, 1, "HIF Write success");
    return rc;
}


int mantis_hif_read_mem(struct mantis_ca *ca, u32 addr)
{
    struct mantis_pci *mantis = ca->ca_priv;
    u32 hif_addr = 0, data, count = 4;

    dprintk(MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF Mem Read", mantis->num);
    mutex_lock(&ca->ca_lock);
    hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
    hif_addr &= ~MANTIS_GPIF_PCMCIAIOM;
    hif_addr |=  MANTIS_HIF_STATUS;
    hif_addr |=  addr;

    mmwrite(hif_addr, MANTIS_GPIF_BRADDR);
    mmwrite(count, MANTIS_GPIF_BRBYTES);
    udelay(20);
    mmwrite(hif_addr | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);

    if (mantis_hif_sbuf_opdone_wait(ca) != 0) {
        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): GPIF Smart Buffer operation failed", mantis->num);
        mutex_unlock(&ca->ca_lock);
        return -EREMOTEIO;
    }
    data = mmread(MANTIS_GPIF_DIN);
    mutex_unlock(&ca->ca_lock);
    dprintk(MANTIS_DEBUG, 1, "Mem Read: 0x%02x", data);
    return (data >> 24) & 0xff;
}

int mantis_hif_write_mem(struct mantis_ca *ca, u32 addr, u8 data)
{
    struct mantis_slot *slot = ca->slot;
    struct mantis_pci *mantis = ca->ca_priv;
    u32 hif_addr = 0;

    dprintk(MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF Mem Write", mantis->num);
    mutex_lock(&ca->ca_lock);
    hif_addr &= ~MANTIS_GPIF_HIFRDWRN;
    hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
    hif_addr &= ~MANTIS_GPIF_PCMCIAIOM;
    hif_addr |=  MANTIS_HIF_STATUS;
    hif_addr |=  addr;

    mmwrite(slot->slave_cfg, MANTIS_GPIF_CFGSLA); /* Slot0 alone for now */
    mmwrite(hif_addr, MANTIS_GPIF_ADDR);
    mmwrite(data, MANTIS_GPIF_DOUT);

    if (mantis_hif_write_wait(ca) != 0) {
        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
        mutex_unlock(&ca->ca_lock);
        return -EREMOTEIO;
    }
    dprintk(MANTIS_DEBUG, 1, "Mem Write: (0x%02x to 0x%02x)", data, addr);
    mutex_unlock(&ca->ca_lock);

    return 0;
}

int mantis_hif_read_iom(struct mantis_ca *ca, u32 addr)
{
    struct mantis_pci *mantis = ca->ca_priv;
    u32 data, hif_addr = 0;

    dprintk(MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF I/O Read", mantis->num);
    mutex_lock(&ca->ca_lock);
    hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
    hif_addr |=  MANTIS_GPIF_PCMCIAIOM;
    hif_addr |=  MANTIS_HIF_STATUS;
    hif_addr |=  addr;

    mmwrite(hif_addr, MANTIS_GPIF_BRADDR);
    mmwrite(1, MANTIS_GPIF_BRBYTES);
    udelay(20);
    mmwrite(hif_addr | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);

    if (mantis_hif_sbuf_opdone_wait(ca) != 0) {
        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
        mutex_unlock(&ca->ca_lock);
        return -EREMOTEIO;
    }
    data = mmread(MANTIS_GPIF_DIN);
    dprintk(MANTIS_DEBUG, 1, "I/O Read: 0x%02x", data);
    udelay(50);
    mutex_unlock(&ca->ca_lock);

    return (u8) data;
}

int mantis_hif_write_iom(struct mantis_ca *ca, u32 addr, u8 data)
{
    struct mantis_pci *mantis = ca->ca_priv;
    u32 hif_addr = 0;

    dprintk(MANTIS_DEBUG, 1, "Adapter(%d) Slot(0): Request HIF I/O Write", mantis->num);
    mutex_lock(&ca->ca_lock);
    hif_addr &= ~MANTIS_GPIF_PCMCIAREG;
    hif_addr &= ~MANTIS_GPIF_HIFRDWRN;
    hif_addr |=  MANTIS_GPIF_PCMCIAIOM;
    hif_addr |=  MANTIS_HIF_STATUS;
    hif_addr |=  addr;

    mmwrite(hif_addr, MANTIS_GPIF_ADDR);
    mmwrite(data, MANTIS_GPIF_DOUT);

    if (mantis_hif_write_wait(ca) != 0) {
        dprintk(MANTIS_ERROR, 1, "Adapter(%d) Slot(0): HIF Smart Buffer operation failed", mantis->num);
        mutex_unlock(&ca->ca_lock);
        return -EREMOTEIO;
    }
    dprintk(MANTIS_DEBUG, 1, "I/O Write: (0x%02x to 0x%02x)", data, addr);
    mutex_unlock(&ca->ca_lock);
    udelay(50);

    return 0;
}

int mantis_hif_init(struct mantis_ca *ca)
{
    struct mantis_slot *slot = ca->slot;
    struct mantis_pci *mantis = ca->ca_priv;
    u32 irqcfg;

    slot[0].slave_cfg = 0x70773028;
    dprintk(MANTIS_ERROR, 1, "Adapter(%d) Initializing Mantis Host Interface", mantis->num);

    mutex_lock(&ca->ca_lock);
    irqcfg = mmread(MANTIS_GPIF_IRQCFG);
    irqcfg = MANTIS_MASK_BRRDY  |
         MANTIS_MASK_WRACK  |
         MANTIS_MASK_EXTIRQ |
         MANTIS_MASK_WSTO   |
         MANTIS_MASK_OTHERR |
         MANTIS_MASK_OVFLW;

    mmwrite(irqcfg, MANTIS_GPIF_IRQCFG);
    mutex_unlock(&ca->ca_lock);

    return 0;
}

void mantis_hif_exit(struct mantis_ca *ca)
{
    struct mantis_pci *mantis = ca->ca_priv;
    u32 irqcfg;

    dprintk(MANTIS_ERROR, 1, "Adapter(%d) Exiting Mantis Host Interface", mantis->num);
    mutex_lock(&ca->ca_lock);
    irqcfg = mmread(MANTIS_GPIF_IRQCFG);
    irqcfg &= ~MANTIS_MASK_BRRDY;
    mmwrite(irqcfg, MANTIS_GPIF_IRQCFG);
    mutex_unlock(&ca->ca_lock);
}