sdladrv.c

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		break;

	case SDLA_S514:
                if (!detect_s514(hw)) err = -ENODEV;
		break;

	default:
		if (detect_s502a(port))
			hw->type = SDLA_S502A;
		else if (detect_s502e(port))
			hw->type = SDLA_S502E;
		else if (detect_s503(port))
			hw->type = SDLA_S503;
		else if (detect_s507(port))
			hw->type = SDLA_S507;
		else if (detect_s508(port))
			hw->type = SDLA_S508;
		else err = -ENODEV;
	}
	return err;
}

/*============================================================================
 * Autoselect memory region. 
 * o try all available DMP address options from the top down until success.
 */
static int sdla_autodpm (sdlahw_t* hw)
{
	int i, err = -EINVAL;
	unsigned* opt;

	switch (hw->type) {
	case SDLA_S502A:
		opt = s502a_dpmbase_options;
		break;

	case SDLA_S502E:
	case SDLA_S503:
	case SDLA_S508:
		opt = s508_dpmbase_options;
		break;

	case SDLA_S507:
		opt = s507_dpmbase_options;
		break;

	default:
		return -EINVAL;
	}

	for (i = opt[0]; i && err; --i) {
		hw->dpmbase = phys_to_virt(opt[i]);
		err = sdla_setdpm(hw);
	}
	return err;
}

/*============================================================================
 * Set up adapter dual-port memory window. 
 * o shut down adapter
 * o make sure that no physical memory exists in this region, i.e entire
 *   region reads 0xFF and is not writable when adapter is shut down.
 * o initialize adapter hardware
 * o make sure that region is usable with SDLA card, i.e. we can write to it
 *   when adapter is configured.
 */
static int sdla_setdpm (sdlahw_t* hw)
{
	int err;

	/* Shut down card and verify memory region */
	sdla_down(hw);
	if (check_memregion(hw->dpmbase, hw->dpmsize))
		return -EINVAL;

	/* Initialize adapter and test on-board memory segment by segment.
	 * If memory size appears to be less than shared memory window size,
	 * assume that memory region is unusable.
	 */
	err = sdla_init(hw);
	if (err) return err;

	if (sdla_memtest(hw) < hw->dpmsize) {	/* less than window size */
		sdla_down(hw);
		return -EIO;
	}
	sdla_mapmem(hw, 0L);	/* set window vector at bottom */
	return 0;
}

/*============================================================================
 * Load adapter from the memory image of the SDLA firmware module. 
 * o verify firmware integrity and compatibility
 * o start adapter up
 */
static int sdla_load (sdlahw_t* hw, sfm_t* sfm, unsigned len)
{

	int i;

	/* Verify firmware signature */
	if (strcmp(sfm->signature, SFM_SIGNATURE)) {
		printk(KERN_ERR "%s: not SDLA firmware!\n",
			modname);
		return -EINVAL;
	}

	/* Verify firmware module format version */
	if (sfm->version != SFM_VERSION) {
		printk(KERN_ERR
			"%s: firmware format %u rejected! Expecting %u.\n",
			modname, sfm->version, SFM_VERSION);
		return -EINVAL;
	}

	/* Verify firmware module length and checksum */
	if ((len - offsetof(sfm_t, image) != sfm->info.codesize) ||
		(checksum((void*)&sfm->info,
		sizeof(sfm_info_t) + sfm->info.codesize) != sfm->checksum)) {
		printk(KERN_ERR "%s: firmware corrupted!\n", modname);
		return -EINVAL;
	}

	/* Announce */
	printk(KERN_INFO "%s: loading %s (ID=%u)...\n", modname,
		(sfm->descr[0] != '\0') ? sfm->descr : "unknown firmware",
		sfm->info.codeid);

	if(hw->type == SDLA_S514)
		printk(KERN_INFO "%s: loading S514 adapter, CPU %c\n",
			modname, hw->S514_cpu_no[0]);

	/* Scan through the list of compatible adapters and make sure our
	 * adapter type is listed.
	 */
	for (i = 0;
	     (i < SFM_MAX_SDLA) && (sfm->info.adapter[i] != hw->type);
	     ++i)
	;
	if (i == SFM_MAX_SDLA) {
		printk(KERN_ERR "%s: firmware is not compatible with S%u!\n",
			modname, hw->type);
		;
		return -EINVAL;
	}


	/* Make sure there is enough on-board memory */
	if (hw->memory < sfm->info.memsize) {
		printk(KERN_ERR
			"%s: firmware needs %lu bytes of on-board memory!\n",
			modname, sfm->info.memsize);
		return -EINVAL;
	}

	/* Move code onto adapter */
	if (sdla_poke(hw, sfm->info.codeoffs, sfm->image, sfm->info.codesize)) {
		printk(KERN_ERR "%s: failed to load code segment!\n",
			modname);
		return -EIO;
	}

	/* Prepare boot-time configuration data and kick-off CPU */
	sdla_bootcfg(hw, &sfm->info);
	if (sdla_start(hw, sfm->info.startoffs)) {
		printk(KERN_ERR "%s: Damn... Adapter won't start!\n",
			modname);
		return -EIO;
	}

	/* position DPM window over the mailbox and enable interrupts */
        if (sdla_mapmem(hw, sfm->info.winoffs) || sdla_inten(hw)) {
		printk(KERN_ERR "%s: adapter hardware failure!\n",
			modname);
		return -EIO;
	}
	hw->fwid = sfm->info.codeid;		/* set firmware ID */
	return 0;
}

/*============================================================================
 * Initialize SDLA hardware: setup memory window, IRQ, etc.
 */
static int sdla_init (sdlahw_t* hw)
{
	int i;

	for (i = 0; i < SDLA_MAXIORANGE; ++i)
		hw->regs[i] = 0;

	switch (hw->type) {
	case SDLA_S502A: return init_s502a(hw);
	case SDLA_S502E: return init_s502e(hw);
	case SDLA_S503:  return init_s503(hw);
	case SDLA_S507:  return init_s507(hw);
	case SDLA_S508:  return init_s508(hw);
	}
	return -EINVAL;
}

/*============================================================================
 * Test adapter on-board memory.
 * o slide DPM window from the bottom up and test adapter memory segment by
 *   segment.
 * Return adapter memory size.
 */
static unsigned long sdla_memtest (sdlahw_t* hw)
{
	unsigned long memsize;
	unsigned winsize;

	for (memsize = 0, winsize = hw->dpmsize;
	     !sdla_mapmem(hw, memsize) &&
		(test_memregion(hw->dpmbase, winsize) == winsize)
	     ;
	     memsize += winsize)
	;
	hw->memory = memsize;
	return memsize;
}

/*============================================================================
 * Prepare boot-time firmware configuration data.
 * o position DPM window
 * o initialize configuration data area
 */
static int sdla_bootcfg (sdlahw_t* hw, sfm_info_t* sfminfo)
{
	unsigned char* data;

	if (!sfminfo->datasize) return 0;	/* nothing to do */

	if (sdla_mapmem(hw, sfminfo->dataoffs) != 0)
		return -EIO;

	if(hw->type == SDLA_S514)
                data = (void*)(hw->dpmbase + sfminfo->dataoffs);
        else
                data = (void*)((u8 *)hw->dpmbase +
                        (sfminfo->dataoffs - hw->vector));

	memset_io (data, 0, sfminfo->datasize);

	writeb (make_config_byte(hw), &data[0x00]);

	switch (sfminfo->codeid) {
	case SFID_X25_502:
	case SFID_X25_508:
                writeb (3, &data[0x01]);        /* T1 timer */
                writeb (10, &data[0x03]);       /* N2 */
                writeb (7, &data[0x06]);        /* HDLC window size */
                writeb (1, &data[0x0B]);        /* DTE */
                writeb (2, &data[0x0C]);        /* X.25 packet window size */
                writew (128, &data[0x0D]);	/* default X.25 data size */
                writew (128, &data[0x0F]);	/* maximum X.25 data size */
		break;
	}
	return 0;
}

/*============================================================================
 * Prepare configuration byte identifying adapter type and CPU clock rate.
 */
static unsigned char make_config_byte (sdlahw_t* hw)
{
	unsigned char byte = 0;

	switch (hw->pclk) {
		case 5000:  byte = 0x01; break;
		case 7200:  byte = 0x02; break;
		case 8000:  byte = 0x03; break;
		case 10000: byte = 0x04; break;
		case 16000: byte = 0x05; break;
	}

	switch (hw->type) {
		case SDLA_S502E: byte |= 0x80; break;
		case SDLA_S503:  byte |= 0x40; break;
	}
	return byte;
}

/*============================================================================
 * Start adapter's CPU.
 * o calculate a pointer to adapter's cold boot entry point
 * o position DPM window
 * o place boot instruction (jp addr) at cold boot entry point
 * o start CPU
 */
static int sdla_start (sdlahw_t* hw, unsigned addr)
{
	unsigned port = hw->port;
	unsigned char *bootp;
	int err, tmp, i;

	if (!port && (hw->type != SDLA_S514)) return -EFAULT;

 	switch (hw->type) {
	case SDLA_S502A:
		bootp = hw->dpmbase;
		bootp += 0x66;
		break;

	case SDLA_S502E:
	case SDLA_S503:
	case SDLA_S507:
	case SDLA_S508:
	case SDLA_S514:
		bootp = hw->dpmbase;
		break;

	default:
		return -EINVAL;
	}

	err = sdla_mapmem(hw, 0);
	if (err) return err;

      	writeb (0xC3, bootp);   /* Z80: 'jp' opcode */
	bootp ++;
	writew (addr, bootp);

	switch (hw->type) {
	case SDLA_S502A:
		_OUTB(port, 0x10);		/* issue NMI to CPU */
		hw->regs[0] = 0x10;
		break;

	case SDLA_S502E:
		_OUTB(port + 3, 0x01);		/* start CPU */
		hw->regs[3] = 0x01;
		for (i = 0; i < SDLA_IODELAY; ++i);
		if (_INB(port) & 0x01) {	/* verify */
			/*
			 * Enabling CPU changes functionality of the
			 * control register, so we have to reset its
			 * mirror.
			 */
			_OUTB(port, 0);		/* disable interrupts */
			hw->regs[0] = 0;
		}
		else return -EIO;
		break;

	case SDLA_S503:
		tmp = hw->regs[0] | 0x09;	/* set bits 0 and 3 */
		_OUTB(port, tmp);
		hw->regs[0] = tmp;		/* update mirror */
		for (i = 0; i < SDLA_IODELAY; ++i);
		if (!(_INB(port) & 0x01))	/* verify */
			return -EIO;
		break;

	case SDLA_S507:
		tmp = hw->regs[0] | 0x02;
		_OUTB(port, tmp);
		hw->regs[0] = tmp;		/* update mirror */
		for (i = 0; i < SDLA_IODELAY; ++i);
		if (!(_INB(port) & 0x04))	/* verify */
			return -EIO;
		break;

	case SDLA_S508:
		tmp = hw->regs[0] | 0x02;
		_OUTB(port, tmp);
		hw->regs[0] = tmp;	/* update mirror */
		for (i = 0; i < SDLA_IODELAY; ++i);
		if (!(_INB(port + 1) & 0x02))	/* verify */
			return -EIO;
		break;

	case SDLA_S514:
		writeb (S514_CPU_START, hw->vector);
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

/*============================================================================
 * Initialize S502A adapter.
 */
static int init_s502a (sdlahw_t* hw)
{
	unsigned port = hw->port;
	int tmp, i;

	if (!detect_s502a(port))
		return -ENODEV;

	hw->regs[0] = 0x08;
	hw->regs[1] = 0xFF;

	/* Verify configuration options */
	i = get_option_index(s502a_dpmbase_options, virt_to_phys(hw->dpmbase));
	if (i == 0)
		return -EINVAL;

	tmp = s502a_hmcr[i - 1];
	switch (hw->dpmsize) {
	case 0x2000:
		tmp |= 0x01;
		break;

	case 0x10000L:
		break;

	default:
		return -EINVAL;
	}

	/* Setup dual-port memory window (this also enables memory access) */
	_OUTB(port + 1, tmp);
	hw->regs[1] = tmp;
	hw->regs[0] = 0x08;
	return 0;
}

/*============================================================================
 * Initialize S502E adapter.
 */
static int init_s502e (sdlahw_t* hw)
{
	unsigned port = hw->port;
	int tmp, i;

	if (!detect_s502e(port))
		return -ENODEV;

	/* Verify configuration options */
	i = get_option_index(s508_dpmbase_options, virt_to_phys(hw->dpmbase));
	if (i == 0)
		return -EINVAL;

	tmp = s502e_hmcr[i - 1];
	switch (hw->dpmsize) {
	case 0x2000:
		tmp |= 0x01;
		break;

	case 0x10000L:
		break;

	default:
		return -EINVAL;
	}

	/* Setup dual-port memory window */
	_OUTB(port + 1, tmp);
	hw->regs[1] = tmp;

	/* Enable memory access */
	_OUTB(port, 0x02);
	hw->regs[0] = 0x02;
	for (i = 0; i < SDLA_IODELAY; ++i);	/* delay */
	return (_INB(port) & 0x02) ? 0 : -EIO;
}

/*============================================================================
 * Initialize S503 adapter.
 * ---------------------------------------------------------------------------
 */
static int init_s503 (sdlahw_t* hw)
{
	unsigned port = hw->port;
	int tmp, i;

	if (!detect_s503(port))
		return -ENODEV;

	/* Verify configuration options */
	i = get_option_index(s508_dpmbase_options, virt_to_phys(hw->dpmbase));
	if (i == 0)
		return -EINVAL;

	tmp = s502e_hmcr[i - 1];
	switch (hw->dpmsize) {
	case 0x2000:
		tmp |= 0x01;
		break;

	case 0x10000L:
		break;

	default:
		return -EINVAL;
	}

	/* Setup dual-port memory window */
	_OUTB(port + 1, tmp);
	hw->regs[1] = tmp;

	/* Enable memory access */
	_OUTB(port, 0x02);
	hw->regs[0] = 0x02;	/* update mirror */
	return 0;
}

/*============================================================================
 * Initialize S507 adapter.
 */
static int init_s507 (sdlahw_t* hw)
{
	unsigned port = hw->port;
	int tmp, i;

	if (!detect_s507(port))
		return -ENODEV;

	/* Verify configuration options */
	i = get_option_index(s507_dpmbase_options, virt_to_phys(hw->dpmbase));
	if (i == 0)
		return -EINVAL;

	tmp = s507_hmcr[i - 1];
	switch (hw->dpmsize) {
	case 0x2000:
		tmp |= 0x01;
		break;

	case 0x10000L:
		break;

	default:
		return -EINVAL;
	}

	/* Enable adapter's logic */
	_OUTB(port, 0x01);
	hw->regs[0] = 0x01;
	for (i = 0; i < SDLA_IODELAY; ++i);	/* delay */
	if (!(_INB(port) & 0x20))
		return -EIO;