/* 
   * Driver for Intel I82092AA PCI-PCMCIA bridge.
   *
   * (C) 2001 Red Hat, Inc.
   *
   * Author: Arjan Van De Ven <arjanv@redhat.com>
   * Loosly based on i82365.c from the pcmcia-cs package

   */
  
  #include <linux/kernel.h>

  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include <linux/workqueue.h>
  #include <linux/interrupt.h>
  #include <linux/device.h>

  #include <pcmcia/ss.h>

  #include <asm/io.h>
  
  #include "i82092aa.h"
  #include "i82365.h"
  
  MODULE_LICENSE("GPL");
  
  /* PCI core routines */

  static const struct pci_device_id i82092aa_pci_ids[] = {

  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82092AA_0) },
  	{ }

  };
  MODULE_DEVICE_TABLE(pci, i82092aa_pci_ids);

  static struct pci_driver i82092aa_pci_driver = {

  	.name           = "i82092aa",
  	.id_table       = i82092aa_pci_ids,
  	.probe          = i82092aa_pci_probe,

  	.remove         = i82092aa_pci_remove,

  };
  
  
  /* the pccard structure and its functions */
  static struct pccard_operations i82092aa_operations = {
  	.init 		 	= i82092aa_init,
  	.get_status		= i82092aa_get_status,

  	.set_socket		= i82092aa_set_socket,
  	.set_io_map		= i82092aa_set_io_map,
  	.set_mem_map		= i82092aa_set_mem_map,
  };

  /* The card can do up to 4 sockets, allocate a structure for each of them */

  
  struct socket_info {
  	int	number;
  	int	card_state; 	/*  0 = no socket,
  				    1 = empty socket, 
  				    2 = card but not initialized,
  				    3 = operational card */

  	unsigned int io_base; 	/* base io address of the socket */

  	
  	struct pcmcia_socket socket;
  	struct pci_dev *dev;	/* The PCI device for the socket */
  };
  
  #define MAX_SOCKETS 4
  static struct socket_info sockets[MAX_SOCKETS];
  static int socket_count;  /* shortcut */                                  	                                	

  static int i82092aa_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)

  {
  	unsigned char configbyte;
  	int i, ret;
  	
  	enter("i82092aa_pci_probe");
  	
  	if ((ret = pci_enable_device(dev)))
  		return ret;
  		
  	pci_read_config_byte(dev, 0x40, &configbyte);  /* PCI Configuration Control */
  	switch(configbyte&6) {
  		case 0:
  			socket_count = 2;
  			break;
  		case 2:
  			socket_count = 1;
  			break;
  		case 4:
  		case 6:
  			socket_count = 4;
  			break;
  			
  		default:
  			printk(KERN_ERR "i82092aa: Oops, you did something we didn't think of.
  ");
  			ret = -EIO;
  			goto err_out_disable;
  	}
  	printk(KERN_INFO "i82092aa: configured as a %d socket device.
  ", socket_count);
  
  	if (!request_region(pci_resource_start(dev, 0), 2, "i82092aa")) {
  		ret = -EBUSY;
  		goto err_out_disable;
  	}
  	
  	for (i = 0;i<socket_count;i++) {
  		sockets[i].card_state = 1; /* 1 = present but empty */
  		sockets[i].io_base = pci_resource_start(dev, 0);
  		sockets[i].socket.features |= SS_CAP_PCCARD;
  		sockets[i].socket.map_size = 0x1000;
  		sockets[i].socket.irq_mask = 0;
  		sockets[i].socket.pci_irq  = dev->irq;

  		sockets[i].socket.cb_dev  = dev;

  		sockets[i].socket.owner = THIS_MODULE;
  
  		sockets[i].number = i;
  		
  		if (card_present(i)) {
  			sockets[i].card_state = 3;
  			dprintk(KERN_DEBUG "i82092aa: slot %i is occupied
  ",i);
  		} else {
  			dprintk(KERN_DEBUG "i82092aa: slot %i is vacant
  ",i);
  		}
  	}
  		
  	/* Now, specifiy that all interrupts are to be done as PCI interrupts */
  	configbyte = 0xFF; /* bitmask, one bit per event, 1 = PCI interrupt, 0 = ISA interrupt */
  	pci_write_config_byte(dev, 0x50, configbyte); /* PCI Interrupt Routing Register */
  
  	/* Register the interrupt handler */
  	dprintk(KERN_DEBUG "Requesting interrupt %i 
  ",dev->irq);

  	if ((ret = request_irq(dev->irq, i82092aa_interrupt, IRQF_SHARED, "i82092aa", i82092aa_interrupt))) {

  		printk(KERN_ERR "i82092aa: Failed to register IRQ %d, aborting
  ", dev->irq);
  		goto err_out_free_res;
  	}

  	for (i = 0; i<socket_count; i++) {

  		sockets[i].socket.dev.parent = &dev->dev;

  		sockets[i].socket.ops = &i82092aa_operations;
  		sockets[i].socket.resource_ops = &pccard_nonstatic_ops;
  		ret = pcmcia_register_socket(&sockets[i].socket);
  		if (ret) {
  			goto err_out_free_sockets;
  		}
  	}
  
  	leave("i82092aa_pci_probe");
  	return 0;
  
  err_out_free_sockets:
  	if (i) {
  		for (i--;i>=0;i--) {
  			pcmcia_unregister_socket(&sockets[i].socket);
  		}
  	}
  	free_irq(dev->irq, i82092aa_interrupt);
  err_out_free_res:
  	release_region(pci_resource_start(dev, 0), 2);
  err_out_disable:
  	pci_disable_device(dev);
  	return ret;			
  }

  static void i82092aa_pci_remove(struct pci_dev *dev)

  {

  	int i;

  
  	enter("i82092aa_pci_remove");
  	
  	free_irq(dev->irq, i82092aa_interrupt);

  	for (i = 0; i < socket_count; i++)
  		pcmcia_unregister_socket(&sockets[i].socket);

  
  	leave("i82092aa_pci_remove");
  }
  
  static DEFINE_SPINLOCK(port_lock);
  
  /* basic value read/write functions */
  
  static unsigned char indirect_read(int socket, unsigned short reg)
  {
  	unsigned short int port;
  	unsigned char val;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg += socket * 0x40;
  	port = sockets[socket].io_base;
  	outb(reg,port);
  	val = inb(port+1);
  	spin_unlock_irqrestore(&port_lock,flags);
  	return val;
  }
  
  #if 0
  static unsigned short indirect_read16(int socket, unsigned short reg)
  {
  	unsigned short int port;
  	unsigned short tmp;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg  = reg + socket * 0x40;
  	port = sockets[socket].io_base;
  	outb(reg,port);
  	tmp = inb(port+1);
  	reg++;
  	outb(reg,port);
  	tmp = tmp | (inb(port+1)<<8);
  	spin_unlock_irqrestore(&port_lock,flags);
  	return tmp;
  }
  #endif
  
  static void indirect_write(int socket, unsigned short reg, unsigned char value)
  {
  	unsigned short int port;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg = reg + socket * 0x40;
  	port = sockets[socket].io_base; 
  	outb(reg,port);
  	outb(value,port+1);
  	spin_unlock_irqrestore(&port_lock,flags);
  }
  
  static void indirect_setbit(int socket, unsigned short reg, unsigned char mask)
  {
  	unsigned short int port;
  	unsigned char val;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg = reg + socket * 0x40;
  	port = sockets[socket].io_base; 
  	outb(reg,port);
  	val = inb(port+1);
  	val |= mask;
  	outb(reg,port);
  	outb(val,port+1);
  	spin_unlock_irqrestore(&port_lock,flags);
  }
  
  
  static void indirect_resetbit(int socket, unsigned short reg, unsigned char mask)
  {
  	unsigned short int port;
  	unsigned char val;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg = reg + socket * 0x40;
  	port = sockets[socket].io_base; 
  	outb(reg,port);
  	val = inb(port+1);
  	val &= ~mask;
  	outb(reg,port);
  	outb(val,port+1);
  	spin_unlock_irqrestore(&port_lock,flags);
  }
  
  static void indirect_write16(int socket, unsigned short reg, unsigned short value)
  {
  	unsigned short int port;
  	unsigned char val;
  	unsigned long flags;
  	spin_lock_irqsave(&port_lock,flags);
  	reg = reg + socket * 0x40;
  	port = sockets[socket].io_base; 
  	
  	outb(reg,port);
  	val = value & 255;
  	outb(val,port+1);
  	
  	reg++;
  	
  	outb(reg,port);
  	val = value>>8;
  	outb(val,port+1);
  	spin_unlock_irqrestore(&port_lock,flags);
  }
  
  /* simple helper functions */
  /* External clock time, in nanoseconds.  120 ns = 8.33 MHz */
  static int cycle_time = 120;
  
  static int to_cycles(int ns)
  {
  	if (cycle_time!=0)
  		return ns/cycle_time;
  	else
  		return 0;
  }
      
  
  /* Interrupt handler functionality */

  static irqreturn_t i82092aa_interrupt(int irq, void *dev)

  {
  	int i;
  	int loopcount = 0;
  	int handled = 0;
  
  	unsigned int events, active=0;
  	
  /*	enter("i82092aa_interrupt");*/
  	
  	while (1) {
  		loopcount++;
  		if (loopcount>20) {
  			printk(KERN_ERR "i82092aa: infinite eventloop in interrupt 
  ");
  			break;
  		}
  		
  		active = 0;
  		
  		for (i=0;i<socket_count;i++) {
  			int csc;
  			if (sockets[i].card_state==0) /* Inactive socket, should not happen */
  				continue;
  			
  			csc = indirect_read(i,I365_CSC); /* card status change register */
  			
  			if (csc==0)  /* no events on this socket */
  			   	continue;
  			handled = 1;
  			events = 0;
  			 
  			if (csc & I365_CSC_DETECT) {
  				events |= SS_DETECT;
  				printk("Card detected in socket %i!
  ",i);
  			 }
  			
  			if (indirect_read(i,I365_INTCTL) & I365_PC_IOCARD) { 
  				/* For IO/CARDS, bit 0 means "read the card" */
  				events |= (csc & I365_CSC_STSCHG) ? SS_STSCHG : 0; 
  			} else {
  				/* Check for battery/ready events */
  				events |= (csc & I365_CSC_BVD1) ? SS_BATDEAD : 0;
  				events |= (csc & I365_CSC_BVD2) ? SS_BATWARN : 0;
  				events |= (csc & I365_CSC_READY) ? SS_READY : 0;
  			}
  			
  			if (events) {
  				pcmcia_parse_events(&sockets[i].socket, events);
  			}
  			active |= events;
  		}
  				
  		if (active==0) /* no more events to handle */
  			break;				
  		
  	}
  	return IRQ_RETVAL(handled);
  /*	leave("i82092aa_interrupt");*/
  }
  
  
  
  /* socket functions */
  
  static int card_present(int socketno)
  {	
  	unsigned int val;
  	enter("card_present");
  	
  	if ((socketno<0) || (socketno >= MAX_SOCKETS))
  		return 0;
  	if (sockets[socketno].io_base == 0)
  		return 0;
  
  		
  	val = indirect_read(socketno, 1); /* Interface status register */
  	if ((val&12)==12) {
  		leave("card_present 1");
  		return 1;
  	}
  		
  	leave("card_present 0");
  	return 0;
  }
  
  static void set_bridge_state(int sock)
  {
  	enter("set_bridge_state");
  	indirect_write(sock, I365_GBLCTL,0x00);
  	indirect_write(sock, I365_GENCTL,0x00);
  	
  	indirect_setbit(sock, I365_INTCTL,0x08);
  	leave("set_bridge_state");
  }
  
  
  
  
  
        
  static int i82092aa_init(struct pcmcia_socket *sock)
  {
  	int i;
  	struct resource res = { .start = 0, .end = 0x0fff };
          pccard_io_map io = { 0, 0, 0, 0, 1 };
  	pccard_mem_map mem = { .res = &res, };
          
          enter("i82092aa_init");
                          
          for (i = 0; i < 2; i++) {
          	io.map = i;
                  i82092aa_set_io_map(sock, &io);
  	}
          for (i = 0; i < 5; i++) {
          	mem.map = i;
                  i82092aa_set_mem_map(sock, &mem);
  	}
  	
  	leave("i82092aa_init");
  	return 0;
  }
                                                                                                                                                                                                                                                
  static int i82092aa_get_status(struct pcmcia_socket *socket, u_int *value)
  {
  	unsigned int sock = container_of(socket, struct socket_info, socket)->number;
  	unsigned int status;
  	
  	enter("i82092aa_get_status");
  	
  	status = indirect_read(sock,I365_STATUS); /* Interface Status Register */
  	*value = 0;
  	
  	if ((status & I365_CS_DETECT) == I365_CS_DETECT) {
  		*value |= SS_DETECT;
  	}
  		
  	/* IO cards have a different meaning of bits 0,1 */
  	/* Also notice the inverse-logic on the bits */
  	 if (indirect_read(sock, I365_INTCTL) & I365_PC_IOCARD)	{
  	 	/* IO card */
  	 	if (!(status & I365_CS_STSCHG))
  	 		*value |= SS_STSCHG;
  	 } else { /* non I/O card */
  	 	if (!(status & I365_CS_BVD1))
  	 		*value |= SS_BATDEAD;
  	 	if (!(status & I365_CS_BVD2))
  	 		*value |= SS_BATWARN;
  	 		
  	 }
  	 
  	 if (status & I365_CS_WRPROT)
  	 	(*value) |= SS_WRPROT;	/* card is write protected */
  	 
  	 if (status & I365_CS_READY)
  	 	(*value) |= SS_READY;    /* card is not busy */
  	 	
  	 if (status & I365_CS_POWERON)
  	 	(*value) |= SS_POWERON;  /* power is applied to the card */
  
  
  	leave("i82092aa_get_status");
  	return 0;
  }

  static int i82092aa_set_socket(struct pcmcia_socket *socket, socket_state_t *state) 
  {
  	unsigned int sock = container_of(socket, struct socket_info, socket)->number;
  	unsigned char reg;
  	
  	enter("i82092aa_set_socket");
  	
  	/* First, set the global controller options */
  	
  	set_bridge_state(sock);
  	
  	/* Values for the IGENC register */
  	
  	reg = 0;
  	if (!(state->flags & SS_RESET)) 	/* The reset bit has "inverse" logic */
  		reg = reg | I365_PC_RESET;  
  	if (state->flags & SS_IOCARD) 
  		reg = reg | I365_PC_IOCARD;
  		
  	indirect_write(sock,I365_INTCTL,reg); /* IGENC, Interrupt and General Control Register */
  	
  	/* Power registers */
  	
  	reg = I365_PWR_NORESET; /* default: disable resetdrv on resume */
  	
  	if (state->flags & SS_PWR_AUTO) {
  		printk("Auto power
  ");
  		reg |= I365_PWR_AUTO;	/* automatic power mngmnt */
  	}
  	if (state->flags & SS_OUTPUT_ENA) {
  		printk("Power Enabled 
  ");
  		reg |= I365_PWR_OUT;	/* enable power */
  	}
  	
  	switch (state->Vcc) {
  		case 0:	
  			break;
  		case 50: 
  			printk("setting voltage to Vcc to 5V on socket %i
  ",sock);
  			reg |= I365_VCC_5V;
  			break;
  		default:
  			printk("i82092aa: i82092aa_set_socket called with invalid VCC power value: %i ", state->Vcc);
  			leave("i82092aa_set_socket");
  			return -EINVAL;
  	}
  	
  	
  	switch (state->Vpp) {
  		case 0:	
  			printk("not setting Vpp on socket %i
  ",sock);
  			break;
  		case 50: 
  			printk("setting Vpp to 5.0 for socket %i
  ",sock);
  			reg |= I365_VPP1_5V | I365_VPP2_5V;
  			break;
  		case 120: 
  			printk("setting Vpp to 12.0
  ");
  			reg |= I365_VPP1_12V | I365_VPP2_12V;
  			break;
  		default:
  			printk("i82092aa: i82092aa_set_socket called with invalid VPP power value: %i ", state->Vcc);
  			leave("i82092aa_set_socket");
  			return -EINVAL;
  	}
  	
  	if (reg != indirect_read(sock,I365_POWER)) /* only write if changed */
  		indirect_write(sock,I365_POWER,reg);
  		
  	/* Enable specific interrupt events */
  	
  	reg = 0x00;
  	if (state->csc_mask & SS_DETECT) {
  		reg |= I365_CSC_DETECT;
  	}
  	if (state->flags & SS_IOCARD) {
  		if (state->csc_mask & SS_STSCHG)
  			reg |= I365_CSC_STSCHG;
  	} else {
  		if (state->csc_mask & SS_BATDEAD) 
  			reg |= I365_CSC_BVD1;
  		if (state->csc_mask & SS_BATWARN) 
  			reg |= I365_CSC_BVD2;
  		if (state->csc_mask & SS_READY) 
  			reg |= I365_CSC_READY; 
  		                        
  	}
  	
  	/* now write the value and clear the (probably bogus) pending stuff by doing a dummy read*/
  	
  	indirect_write(sock,I365_CSCINT,reg);
  	(void)indirect_read(sock,I365_CSC);
  
  	leave("i82092aa_set_socket");
  	return 0;
  }
  
  static int i82092aa_set_io_map(struct pcmcia_socket *socket, struct pccard_io_map *io)
  {
  	unsigned int sock = container_of(socket, struct socket_info, socket)->number;
  	unsigned char map, ioctl;
  	
  	enter("i82092aa_set_io_map");
  	
  	map = io->map;
  	
  	/* Check error conditions */	
  	if (map > 1) {
  		leave("i82092aa_set_io_map with invalid map");
  		return -EINVAL;
  	}
  	if ((io->start > 0xffff) || (io->stop > 0xffff) || (io->stop < io->start)){
  		leave("i82092aa_set_io_map with invalid io");
  		return -EINVAL;
  	}
  
  	/* Turn off the window before changing anything */ 
  	if (indirect_read(sock, I365_ADDRWIN) & I365_ENA_IO(map))
  		indirect_resetbit(sock, I365_ADDRWIN, I365_ENA_IO(map));
  
  /*	printk("set_io_map: Setting range to %x - %x 
  ",io->start,io->stop);  */
  	
  	/* write the new values */
  	indirect_write16(sock,I365_IO(map)+I365_W_START,io->start);            	
  	indirect_write16(sock,I365_IO(map)+I365_W_STOP,io->stop);            	
  	            	
  	ioctl = indirect_read(sock,I365_IOCTL) & ~I365_IOCTL_MASK(map);
  	
  	if (io->flags & (MAP_16BIT|MAP_AUTOSZ))
  		ioctl |= I365_IOCTL_16BIT(map);
  		
  	indirect_write(sock,I365_IOCTL,ioctl);
  	
  	/* Turn the window back on if needed */
  	if (io->flags & MAP_ACTIVE)
  		indirect_setbit(sock,I365_ADDRWIN,I365_ENA_IO(map));
  			
  	leave("i82092aa_set_io_map");	
  	return 0;
  }
  
  static int i82092aa_set_mem_map(struct pcmcia_socket *socket, struct pccard_mem_map *mem)
  {
  	struct socket_info *sock_info = container_of(socket, struct socket_info, socket);
  	unsigned int sock = sock_info->number;
  	struct pci_bus_region region;
  	unsigned short base, i;
  	unsigned char map;
  	
  	enter("i82092aa_set_mem_map");

  	pcibios_resource_to_bus(sock_info->dev->bus, &region, mem->res);

  	
  	map = mem->map;
  	if (map > 4) {
  		leave("i82092aa_set_mem_map: invalid map");
  		return -EINVAL;
  	}
  	
  	
  	if ( (mem->card_start > 0x3ffffff) || (region.start > region.end) ||
  	     (mem->speed > 1000) ) {
  		leave("i82092aa_set_mem_map: invalid address / speed");

  		printk("invalid mem map for socket %i: %llx to %llx with a "
  			"start of %x
  ",
  			sock,
  			(unsigned long long)region.start,
  			(unsigned long long)region.end,
  			mem->card_start);

  		return -EINVAL;
  	}
  	
  	/* Turn off the window before changing anything */
  	if (indirect_read(sock, I365_ADDRWIN) & I365_ENA_MEM(map))
  	              indirect_resetbit(sock, I365_ADDRWIN, I365_ENA_MEM(map));
  	                 
  	                 
  /* 	printk("set_mem_map: Setting map %i range to %x - %x on socket %i, speed is %i, active = %i 
  ",map, region.start,region.end,sock,mem->speed,mem->flags & MAP_ACTIVE);  */
  
  	/* write the start address */
  	base = I365_MEM(map);
  	i = (region.start >> 12) & 0x0fff;
  	if (mem->flags & MAP_16BIT) 
  		i |= I365_MEM_16BIT;
  	if (mem->flags & MAP_0WS)
  		i |= I365_MEM_0WS;	
  	indirect_write16(sock,base+I365_W_START,i);
  		               
  	/* write the stop address */
  	
  	i= (region.end >> 12) & 0x0fff;
  	switch (to_cycles(mem->speed)) {
  		case 0:
  			break;
  		case 1:
  			i |= I365_MEM_WS0;
  			break;
  		case 2:
  			i |= I365_MEM_WS1;
  			break;
  		default:
  			i |= I365_MEM_WS1 | I365_MEM_WS0;
  			break;
  	}
  	
  	indirect_write16(sock,base+I365_W_STOP,i);
  	
  	/* card start */
  	
  	i = ((mem->card_start - region.start) >> 12) & 0x3fff;
  	if (mem->flags & MAP_WRPROT)
  		i |= I365_MEM_WRPROT;
  	if (mem->flags & MAP_ATTRIB) {
  /*		printk("requesting attribute memory for socket %i
  ",sock);*/
  		i |= I365_MEM_REG;
  	} else {
  /*		printk("requesting normal memory for socket %i
  ",sock);*/
  	}
  	indirect_write16(sock,base+I365_W_OFF,i);
  	
  	/* Enable the window if necessary */
  	if (mem->flags & MAP_ACTIVE)
  		indirect_setbit(sock, I365_ADDRWIN, I365_ENA_MEM(map));
  	            
  	leave("i82092aa_set_mem_map");
  	return 0;
  }
  
  static int i82092aa_module_init(void)
  {

  	return pci_register_driver(&i82092aa_pci_driver);

  }
  
  static void i82092aa_module_exit(void)
  {
  	enter("i82092aa_module_exit");

  	pci_unregister_driver(&i82092aa_pci_driver);

  	if (sockets[0].io_base>0)
  			 release_region(sockets[0].io_base, 2);
  	leave("i82092aa_module_exit");
  }
  
  module_init(i82092aa_module_init);
  module_exit(i82092aa_module_exit);