i82092.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 809 行 · 第 1/2 页

/* 
 * 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 <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/device.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"

MODULE_LICENSE("GPL");

/* 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,
	 },
	 {} 
};
MODULE_DEVICE_TABLE(pci, i82092aa_pci_ids);

static int i82092aa_socket_suspend (struct pci_dev *dev, u32 state)
{
	return pcmcia_socket_dev_suspend(&dev->dev, state);
}

static int i82092aa_socket_resume (struct pci_dev *dev)
{
	return pcmcia_socket_dev_resume(&dev->dev);
}

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        = i82092aa_socket_suspend,
	.resume         = i82092aa_socket_resume,
};


/* the pccard structure and its functions */
static struct pccard_operations i82092aa_operations = {
	.init 		 	= i82092aa_init,
	.suspend	   	= i82092aa_suspend,
	.get_status		= i82092aa_get_status,
	.get_socket		= i82092aa_get_socket,
	.set_socket		= i82092aa_set_socket,
	.set_io_map		= i82092aa_set_io_map,
	.set_mem_map		= i82092aa_set_mem_map,
};

/* The card can do upto 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 */
	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 __devinit 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.\n");
			ret = -EIO;
			goto err_out_disable;
	}
	printk(KERN_INFO "i82092aa: configured as a %d socket device.\n", 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.owner = THIS_MODULE;

		sockets[i].number = i;
		
		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 ((ret = request_irq(dev->irq, i82092aa_interrupt, SA_SHIRQ, "i82092aa", i82092aa_interrupt))) {
		printk(KERN_ERR "i82092aa: Failed to register IRQ %d, aborting\n", dev->irq);
		goto err_out_free_res;
	}

	pci_set_drvdata(dev, &sockets[i].socket);

	for (i = 0; i<socket_count; i++) {
		sockets[i].socket.dev.dev = &dev->dev;
		sockets[i].socket.ops = &i82092aa_operations;
		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 __devexit i82092aa_pci_remove(struct pci_dev *dev)
{
	struct pcmcia_socket *socket = pci_get_drvdata(dev);

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

	if (socket)
		pcmcia_unregister_socket(socket);

	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;
}

#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, struct pt_regs *regs)
{
	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 \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 */
			   	continue;
			handled = 1;
			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) {
				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)