i82092.c

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/* 
 * Driver for Intel I82092AA PCI-PCMCIA bridge.
 *
 * (C) 2001 Red Hat, Inc.
 *
 * Author: Arjan Van De Ven <[e-mail]>
 * Loosly based on i82365.c from the pcmcia-cs package
 *
 * $Id: i82092aa.c,v 1.2 2001/10/23 14:43:34 arjanv Exp $
 */

#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>

#include <asm/system.h>
#include <asm/io.h>

#include "i82092aa.h"
#include "i82365.h"

/* PCI core routines */
static struct pci_device_id i82092aa_pci_ids[] = {
	{
	      vendor:PCI_VENDOR_ID_INTEL,
	      device:PCI_DEVICE_ID_INTEL_82092AA_0,
	      subvendor:PCI_ANY_ID,
	      subdevice:PCI_ANY_ID,
	      class: 0, class_mask:0,

	 },
	 {} 
};

static struct pci_driver i82092aa_pci_drv = {
	name:           "i82092aa",
	id_table:       i82092aa_pci_ids,
	probe:          i82092aa_pci_probe,
	remove:         __devexit_p(i82092aa_pci_remove),
	suspend:        NULL,
	resume:         NULL 
};


/* the pccard structure and its functions */
static struct pccard_operations i82092aa_operations = {
	init: 		 	i82092aa_init,
	suspend:	   	i82092aa_suspend,
	register_callback: 	i82092aa_register_callback,
	inquire_socket:		i82092aa_inquire_socket,   
	get_status:		i82092aa_get_status,
	get_socket:		i82092aa_get_socket,
	set_socket:		i82092aa_set_socket,
	get_io_map:		i82092aa_get_io_map,
	set_io_map:		i82092aa_set_io_map,
	get_mem_map:		i82092aa_get_mem_map,
	set_mem_map:		i82092aa_set_mem_map,
	proc_setup:		i82092aa_proc_setup,
};

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

struct socket_info {
	int	card_state; 	/*  0 = no socket,
				    1 = empty socket, 
				    2 = card but not initialized,
				    3 = operational card */
	int 	io_base; 	/* base io address of the socket */
	socket_cap_t cap;
	
	unsigned int pending_events; /* Pending events on this interface */
	
	void	(*handler)(void *info, u_int events); 
				/* callback to the driver of the card */
	void	*info;		/* to be passed to the handler */
	
	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 __init i82092aa_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	unsigned char configbyte;
	int i;
	
	enter("i82092aa_pci_probe");
	
	if (pci_enable_device(dev))
		return -EIO;
		
	pci_read_config_byte(dev, 0x40, &configbyte);  /* PCI Configuration Control */
	switch(configbyte&6) {
		case 0:
			printk(KERN_INFO "i82092aa: configured as a 2 socket device.\n");
			socket_count = 2;
			break;
		case 2:
			printk(KERN_INFO "i82092aa: configured as a 1 socket device.\n");
			socket_count = 1;
			break;
		case 4:
		case 6:
			printk(KERN_INFO "i82092aa: configured as a 4 socket device.\n");
			socket_count = 4;
			break;
			
		default:
			printk(KERN_ERR "i82092aa: Oops, you did something we didn't think of.\n");
			return -EIO;
			break;
	}
	
	for (i = 0;i<socket_count;i++) {
		sockets[i].card_state = 1; /* 1 = present but empty */
		sockets[i].io_base = (dev->resource[0].start & ~1);
		 if (sockets[i].io_base > 0) 
		 	request_region(sockets[i].io_base, 2, "i82092aa");
		 
		
		sockets[i].cap.features |= SS_CAP_PCCARD;
		sockets[i].cap.map_size = 0x1000;
		sockets[i].cap.irq_mask = 0;
		sockets[i].cap.pci_irq  = dev->irq;
		
		if (card_present(i)) {
			sockets[i].card_state = 3;
			dprintk(KERN_DEBUG "i82092aa: slot %i is occupied\n",i);
		} else {
			dprintk(KERN_DEBUG "i82092aa: slot %i is vacant\n",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 \n",dev->irq);
	if (request_irq(dev->irq, i82092aa_interrupt, SA_SHIRQ, "i82092aa", i82092aa_interrupt)) {
		printk(KERN_ERR "i82092aa: Failed to register IRQ %d, aborting\n", dev->irq);
		return -EIO;
	}
		 
	
	if (register_ss_entry(socket_count, &i82092aa_operations) != 0)
		printk(KERN_NOTICE "i82092aa: register_ss_entry() failed\n");

	leave("i82092aa_pci_probe");
	return 0;
}

static void __devexit i82092aa_pci_remove(struct pci_dev *dev)
{
	enter("i82092aa_pci_remove");
	
	free_irq(dev->irq, i82092aa_interrupt);

	leave("i82092aa_pci_remove");
}

static spinlock_t port_lock = SPIN_LOCK_UNLOCKED;

/* 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;
}

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;
}

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;
}
    
static int to_ns(int cycles)
{
	return cycle_time*cycles;
}


/* Interrupt handler functionality */

static void i82092aa_bh(void *dummy)
{
        unsigned int events;
	int i;
                
        for (i=0; i < socket_count; i++) {
        	events = xchg(&(sockets[i].pending_events),0);
        	printk("events = %x \n",events);
                if (sockets[i].handler)
                	sockets[i].handler(sockets[i].info, events);
	}
}
                                                                                                                                        

static struct tq_struct i82092aa_task = {
        routine:        i82092aa_bh
};
        

static void i82092aa_interrupt(int irq, void *dev, struct pt_regs *regs)
{
	int i;
	int loopcount = 0;
	
	unsigned int events, active=0;
	
/*	enter("i82092aa_interrupt");*/
	
	while (1) {
		loopcount++;
		if (loopcount>20) {
			printk(KERN_ERR "i82092aa: infinite eventloop in interrupt \n");
			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 */
			   (sockets[i].handler==NULL)) /* no way to handle events */
			   	continue;
			events = 0;
			 
			if (csc & I365_CSC_DETECT) {
				events |= SS_DETECT;
				printk("Card detected in socket %i!\n",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) {
				sockets[i].pending_events |= events;
				schedule_task(&i82092aa_task);
			}
			active |= events;
		}
				
		if (active==0) /* no more events to handle */
			break;				
		
	}
	
/*	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(unsigned int s)
{
	int i;
        pccard_io_map io = { 0, 0, 0, 0, 1 };
        pccard_mem_map mem = { 0, 0, 0, 0, 0, 0 };
        
        enter("i82092aa_init");
                        
        mem.sys_stop = 0x0fff;
        i82092aa_set_socket(s, &dead_socket);
        for (i = 0; i < 2; i++) {
        	io.map = i;
                i82092aa_set_io_map(s, &io);
	}
        for (i = 0; i < 5; i++) {
        	mem.map = i;
                i82092aa_set_mem_map(s, &mem);
	}
	
	leave("i82092aa_init");
	return 0;
}
                                                                                                                                                                                                                                              
static int i82092aa_suspend(unsigned int sock)
{
	int retval;
	enter("i82092aa_suspend");
        retval =  i82092aa_set_socket(sock, &dead_socket);
        leave("i82092aa_suspend");
        return retval;
}
       
static int i82092aa_register_callback(unsigned int sock, void (*handler)(void *, unsigned int), void * info)
{
	enter("i82092aa_register_callback");
	sockets[sock].handler = handler;
        sockets[sock].info = info;
        if (handler == NULL) {   
        	MOD_DEC_USE_COUNT;   
 	} else {
		MOD_INC_USE_COUNT;
	}
	leave("i82092aa_register_callback");
	return 0;