/* $Id: telespci.c,v 2.23.2.3 2004/01/13 14:31:26 keil Exp $
 *
 * low level stuff for Teles PCI isdn cards
 *
 * Author       Ton van Rosmalen
 *              Karsten Keil
 * Copyright    by Ton van Rosmalen
 *              by Karsten Keil      <keil@isdn4linux.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/init.h>
#include "hisax.h"
#include "isac.h"
#include "hscx.h"
#include "isdnl1.h"
#include <linux/pci.h>

static const char *telespci_revision = "$Revision: 2.23.2.3 $";

#define ZORAN_PO_RQ_PEN	0x02000000
#define ZORAN_PO_WR	0x00800000
#define ZORAN_PO_GID0	0x00000000
#define ZORAN_PO_GID1	0x00100000
#define ZORAN_PO_GREG0	0x00000000
#define ZORAN_PO_GREG1	0x00010000
#define ZORAN_PO_DMASK	0xFF

#define WRITE_ADDR_ISAC	(ZORAN_PO_WR | ZORAN_PO_GID0 | ZORAN_PO_GREG0)
#define READ_DATA_ISAC	(ZORAN_PO_GID0 | ZORAN_PO_GREG1)
#define WRITE_DATA_ISAC	(ZORAN_PO_WR | ZORAN_PO_GID0 | ZORAN_PO_GREG1)
#define WRITE_ADDR_HSCX	(ZORAN_PO_WR | ZORAN_PO_GID1 | ZORAN_PO_GREG0)
#define READ_DATA_HSCX	(ZORAN_PO_GID1 | ZORAN_PO_GREG1)
#define WRITE_DATA_HSCX	(ZORAN_PO_WR | ZORAN_PO_GID1 | ZORAN_PO_GREG1)

#define ZORAN_WAIT_NOBUSY	do {		\
		portdata = readl(adr + 0x200);	\
	} while (portdata & ZORAN_PO_RQ_PEN)

static inline u_char
readisac(void __iomem *adr, u_char off)
{
	register unsigned int portdata;

	ZORAN_WAIT_NOBUSY;

	/* set address for ISAC */
	writel(WRITE_ADDR_ISAC | off, adr + 0x200);
	ZORAN_WAIT_NOBUSY;

	/* read data from ISAC */
	writel(READ_DATA_ISAC, adr + 0x200);
	ZORAN_WAIT_NOBUSY;
	return ((u_char)(portdata & ZORAN_PO_DMASK));
}

static inline void
writeisac(void __iomem *adr, u_char off, u_char data)
{
	register unsigned int portdata;

	ZORAN_WAIT_NOBUSY;

	/* set address for ISAC */
	writel(WRITE_ADDR_ISAC | off, adr + 0x200);
	ZORAN_WAIT_NOBUSY;

	/* write data to ISAC */
	writel(WRITE_DATA_ISAC | data, adr + 0x200);
	ZORAN_WAIT_NOBUSY;
}

static inline u_char
readhscx(void __iomem *adr, int hscx, u_char off)
{
	register unsigned int portdata;

	ZORAN_WAIT_NOBUSY;
	/* set address for HSCX */
	writel(WRITE_ADDR_HSCX | ((hscx ? 0x40 : 0) + off), adr + 0x200);
	ZORAN_WAIT_NOBUSY;

	/* read data from HSCX */
	writel(READ_DATA_HSCX, adr + 0x200);
	ZORAN_WAIT_NOBUSY;
	return ((u_char)(portdata & ZORAN_PO_DMASK));
}

static inline void
writehscx(void __iomem *adr, int hscx, u_char off, u_char data)
{
	register unsigned int portdata;

	ZORAN_WAIT_NOBUSY;
	/* set address for HSCX */
	writel(WRITE_ADDR_HSCX | ((hscx ? 0x40 : 0) + off), adr + 0x200);
	ZORAN_WAIT_NOBUSY;

	/* write data to HSCX */
	writel(WRITE_DATA_HSCX | data, adr + 0x200);
	ZORAN_WAIT_NOBUSY;
}

static inline void
read_fifo_isac(void __iomem *adr, u_char *data, int size)
{
	register unsigned int portdata;
	register int i;

	ZORAN_WAIT_NOBUSY;
	/* read data from ISAC */
	for (i = 0; i < size; i++) {
		/* set address for ISAC fifo */
		writel(WRITE_ADDR_ISAC | 0x1E, adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		writel(READ_DATA_ISAC, adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		data[i] = (u_char)(portdata & ZORAN_PO_DMASK);
	}
}

static void
write_fifo_isac(void __iomem *adr, u_char *data, int size)
{
	register unsigned int portdata;
	register int i;

	ZORAN_WAIT_NOBUSY;
	/* write data to ISAC */
	for (i = 0; i < size; i++) {
		/* set address for ISAC fifo */
		writel(WRITE_ADDR_ISAC | 0x1E, adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		writel(WRITE_DATA_ISAC | data[i], adr + 0x200);
		ZORAN_WAIT_NOBUSY;
	}
}

static inline void
read_fifo_hscx(void __iomem *adr, int hscx, u_char *data, int size)
{
	register unsigned int portdata;
	register int i;

	ZORAN_WAIT_NOBUSY;
	/* read data from HSCX */
	for (i = 0; i < size; i++) {
		/* set address for HSCX fifo */
		writel(WRITE_ADDR_HSCX | (hscx ? 0x5F : 0x1F), adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		writel(READ_DATA_HSCX, adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		data[i] = (u_char) (portdata & ZORAN_PO_DMASK);
	}
}

static inline void
write_fifo_hscx(void __iomem *adr, int hscx, u_char *data, int size)
{
	unsigned int portdata;
	register int i;

	ZORAN_WAIT_NOBUSY;
	/* write data to HSCX */
	for (i = 0; i < size; i++) {
		/* set address for HSCX fifo */
		writel(WRITE_ADDR_HSCX | (hscx ? 0x5F : 0x1F), adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		writel(WRITE_DATA_HSCX | data[i], adr + 0x200);
		ZORAN_WAIT_NOBUSY;
		udelay(10);
	}
}

/* Interface functions */

static u_char
ReadISAC(struct IsdnCardState *cs, u_char offset)
{
	return (readisac(cs->hw.teles0.membase, offset));
}

static void
WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)
{
	writeisac(cs->hw.teles0.membase, offset, value);
}

static void
ReadISACfifo(struct IsdnCardState *cs, u_char *data, int size)
{
	read_fifo_isac(cs->hw.teles0.membase, data, size);
}

static void
WriteISACfifo(struct IsdnCardState *cs, u_char *data, int size)
{
	write_fifo_isac(cs->hw.teles0.membase, data, size);
}

static u_char
ReadHSCX(struct IsdnCardState *cs, int hscx, u_char offset)
{
	return (readhscx(cs->hw.teles0.membase, hscx, offset));
}

static void
WriteHSCX(struct IsdnCardState *cs, int hscx, u_char offset, u_char value)
{
	writehscx(cs->hw.teles0.membase, hscx, offset, value);
}

/*
 * fast interrupt HSCX stuff goes here
 */

#define READHSCX(cs, nr, reg) readhscx(cs->hw.teles0.membase, nr, reg)
#define WRITEHSCX(cs, nr, reg, data) writehscx(cs->hw.teles0.membase, nr, reg, data)
#define READHSCXFIFO(cs, nr, ptr, cnt) read_fifo_hscx(cs->hw.teles0.membase, nr, ptr, cnt)
#define WRITEHSCXFIFO(cs, nr, ptr, cnt) write_fifo_hscx(cs->hw.teles0.membase, nr, ptr, cnt)

#include "hscx_irq.c"

static irqreturn_t
telespci_interrupt(int intno, void *dev_id)
{
	struct IsdnCardState *cs = dev_id;
	u_char hval, ival;
	u_long flags;

	spin_lock_irqsave(&cs->lock, flags);
	hval = readhscx(cs->hw.teles0.membase, 1, HSCX_ISTA);
	if (hval)
		hscx_int_main(cs, hval);
	ival = readisac(cs->hw.teles0.membase, ISAC_ISTA);
	if ((hval | ival) == 0) {
		spin_unlock_irqrestore(&cs->lock, flags);
		return IRQ_NONE;
	}
	if (ival)
		isac_interrupt(cs, ival);
	/* Clear interrupt register for Zoran PCI controller */
	writel(0x70000000, cs->hw.teles0.membase + 0x3C);

	writehscx(cs->hw.teles0.membase, 0, HSCX_MASK, 0xFF);
	writehscx(cs->hw.teles0.membase, 1, HSCX_MASK, 0xFF);
	writeisac(cs->hw.teles0.membase, ISAC_MASK, 0xFF);
	writeisac(cs->hw.teles0.membase, ISAC_MASK, 0x0);
	writehscx(cs->hw.teles0.membase, 0, HSCX_MASK, 0x0);
	writehscx(cs->hw.teles0.membase, 1, HSCX_MASK, 0x0);
	spin_unlock_irqrestore(&cs->lock, flags);
	return IRQ_HANDLED;
}

static void
release_io_telespci(struct IsdnCardState *cs)
{
	iounmap(cs->hw.teles0.membase);
}

static int
TelesPCI_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
	u_long flags;

	switch (mt) {
	case CARD_RESET:
		return (0);
	case CARD_RELEASE:
		release_io_telespci(cs);
		return (0);
	case CARD_INIT:
		spin_lock_irqsave(&cs->lock, flags);
		inithscxisac(cs, 3);
		spin_unlock_irqrestore(&cs->lock, flags);
		return (0);
	case CARD_TEST:
		return (0);
	}
	return (0);
}

static struct pci_dev *dev_tel = NULL;

int setup_telespci(struct IsdnCard *card)
{
	struct IsdnCardState *cs = card->cs;
	char tmp[64];

#ifdef __BIG_ENDIAN
#error "not running on big endian machines now"
#endif

	strcpy(tmp, telespci_revision);
	printk(KERN_INFO "HiSax: Teles/PCI driver Rev. %s\n", HiSax_getrev(tmp));
	if (cs->typ != ISDN_CTYPE_TELESPCI)
		return (0);

	if ((dev_tel = hisax_find_pci_device(PCI_VENDOR_ID_ZORAN, PCI_DEVICE_ID_ZORAN_36120, dev_tel))) {
		if (pci_enable_device(dev_tel))
			return (0);
		cs->irq = dev_tel->irq;
		if (!cs->irq) {
			printk(KERN_WARNING "Teles: No IRQ for PCI card found\n");
			return (0);
		}
		cs->hw.teles0.membase = ioremap(pci_resource_start(dev_tel, 0),
						PAGE_SIZE);
		printk(KERN_INFO "Found: Zoran, base-address: 0x%llx, irq: 0x%x\n",
		       (unsigned long long)pci_resource_start(dev_tel, 0),
		       dev_tel->irq);
	} else {
		printk(KERN_WARNING "TelesPCI: No PCI card found\n");
		return (0);
	}

	/* Initialize Zoran PCI controller */
	writel(0x00000000, cs->hw.teles0.membase + 0x28);
	writel(0x01000000, cs->hw.teles0.membase + 0x28);
	writel(0x01000000, cs->hw.teles0.membase + 0x28);
	writel(0x7BFFFFFF, cs->hw.teles0.membase + 0x2C);
	writel(0x70000000, cs->hw.teles0.membase + 0x3C);
	writel(0x61000000, cs->hw.teles0.membase + 0x40);
	/* writel(0x00800000, cs->hw.teles0.membase + 0x200); */

	printk(KERN_INFO
	       "HiSax: Teles PCI config irq:%d mem:%p\n",
	       cs->irq,
	       cs->hw.teles0.membase);

	setup_isac(cs);
	cs->readisac = &ReadISAC;
	cs->writeisac = &WriteISAC;
	cs->readisacfifo = &ReadISACfifo;
	cs->writeisacfifo = &WriteISACfifo;
	cs->BC_Read_Reg = &ReadHSCX;
	cs->BC_Write_Reg = &WriteHSCX;
	cs->BC_Send_Data = &hscx_fill_fifo;
	cs->cardmsg = &TelesPCI_card_msg;
	cs->irq_func = &telespci_interrupt;
	cs->irq_flags |= IRQF_SHARED;
	ISACVersion(cs, "TelesPCI:");
	if (HscxVersion(cs, "TelesPCI:")) {
		printk(KERN_WARNING
		       "TelesPCI: wrong HSCX versions check IO/MEM addresses\n");
		release_io_telespci(cs);
		return (0);
	}
	return (1);
}