pd6729.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 747 行 · 第 1/2 页

/*
 * Driver for the Cirrus PD6729 PCI-PCMCIA bridge.
 *
 * Based on the i82092.c driver.
 *
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 */

#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 "pd6729.h"
#include "i82365.h"
#include "cirrus.h"

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Driver for the Cirrus PD6729 PCI-PCMCIA bridge");
MODULE_AUTHOR("Jun Komuro <[e-mail]>");

#define MAX_SOCKETS 2

/*
 * simple helper functions
 * External clock time, in nanoseconds.  120 ns = 8.33 MHz
 */
#define to_cycles(ns)	((ns)/120)

static spinlock_t port_lock = SPIN_LOCK_UNLOCKED;

/* basic value read/write functions */

static unsigned char indirect_read(struct pd6729_socket *socket, unsigned short reg)
{
	unsigned long port;
	unsigned char val;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg += socket->number * 0x40;
	port = socket->io_base;
	outb(reg, port);
	val = inb(port + 1);
	spin_unlock_irqrestore(&port_lock, flags);

	return val;
}

static unsigned short indirect_read16(struct pd6729_socket *socket, unsigned short reg)
{
	unsigned long port;
	unsigned short tmp;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg  = reg + socket->number * 0x40;
	port = 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(struct pd6729_socket *socket, unsigned short reg, unsigned char value)
{
	unsigned long port;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg = reg + socket->number * 0x40;
	port = socket->io_base;
	outb(reg, port);
	outb(value, port + 1);
	spin_unlock_irqrestore(&port_lock, flags);
}

static void indirect_setbit(struct pd6729_socket *socket, unsigned short reg, unsigned char mask)
{
	unsigned long port;
	unsigned char val;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg = reg + socket->number * 0x40;
	port = 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(struct pd6729_socket *socket, unsigned short reg, unsigned char mask)
{
	unsigned long port;
	unsigned char val;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg = reg + socket->number * 0x40;
	port = 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(struct pd6729_socket *socket, unsigned short reg, unsigned short value)
{
	unsigned long port;
	unsigned char val;
	unsigned long flags;

	spin_lock_irqsave(&port_lock, flags);
	reg = reg + socket->number * 0x40;
	port = 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);
}

/* Interrupt handler functionality */

static irqreturn_t pd6729_interrupt(int irq, void *dev, struct pt_regs *regs)
{
	struct pd6729_socket *socket = (struct pd6729_socket *)dev;
	int i;
	int loopcount = 0;
	int handled = 0;
	unsigned int events, active = 0;

	while (1) {
		loopcount++;
		if (loopcount > 20) {
			printk(KERN_ERR "pd6729: infinite eventloop in interrupt\n");
			break;
		}

		active = 0;

		for (i = 0; i < MAX_SOCKETS; i++) {
			unsigned int csc;

			/* card status change register */
			csc = indirect_read(&socket[i], I365_CSC);
			if (csc == 0)  /* no events on this socket */
				continue;

			handled = 1;
			events = 0;

			if (csc & I365_CSC_DETECT) {
				events |= SS_DETECT;
				dprintk("Card detected in socket %i!\n", i);
			}

			if (indirect_read(&socket[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(&socket[i].socket, events);
			}
			active |= events;
		}

		if (active == 0) /* no more events to handle */
			break;
	}
	return IRQ_RETVAL(handled);
}

/* socket functions */

static void set_bridge_state(struct pd6729_socket *socket)
{
	indirect_write(socket, I365_GBLCTL, 0x00);
	indirect_write(socket, I365_GENCTL, 0x00);

	indirect_setbit(socket, I365_INTCTL, 0x08);
}

static int pd6729_get_status(struct pcmcia_socket *sock, u_int *value)
{
	struct pd6729_socket *socket = container_of(sock, struct pd6729_socket, socket);
	unsigned int status;
	unsigned int data;
	struct pd6729_socket *t;

	/* Interface Status Register */
	status = indirect_read(socket, I365_STATUS);
	*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(socket, 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 */

	t = (socket->number) ? socket : socket + 1;
	indirect_write(t, PD67_EXT_INDEX, PD67_EXTERN_DATA);
	data = indirect_read16(t, PD67_EXT_DATA);
	*value |= (data & PD67_EXD_VS1(socket->number)) ? 0 : SS_3VCARD;

	return 0;
}


static int pd6729_get_socket(struct pcmcia_socket *sock, socket_state_t *state)
{
	struct pd6729_socket *socket = container_of(sock, struct pd6729_socket, socket);
	unsigned char reg, vcc, vpp;

	state->flags    = 0;
	state->Vcc      = 0;
	state->Vpp      = 0;
	state->io_irq   = 0;
	state->csc_mask = 0;

	/*
	 * First the power status of the socket
	 * PCTRL - Power Control Register
	 */
	reg = indirect_read(socket, I365_POWER);

	if (reg & I365_PWR_AUTO)
		state->flags |= SS_PWR_AUTO;  /* Automatic Power Switch */

	if (reg & I365_PWR_OUT)
		state->flags |= SS_OUTPUT_ENA; /* Output signals are enabled */

	vcc = reg & I365_VCC_MASK;    vpp = reg & I365_VPP1_MASK;

	if (reg & I365_VCC_5V) {
		state->Vcc = (indirect_read(socket, PD67_MISC_CTL_1) &
			PD67_MC1_VCC_3V) ? 33 : 50;

		if (vpp == I365_VPP1_5V) {
			if (state->Vcc == 50)
				state->Vpp = 50;
			else
				state->Vpp = 33;
		}
		if (vpp == I365_VPP1_12V)
			state->Vpp = 120;
	}

	/*
	 * Now the IO card, RESET flags and IO interrupt
	 * IGENC, Interrupt and General Control
	 */
	reg = indirect_read(socket, I365_INTCTL);

	if ((reg & I365_PC_RESET) == 0)
		state->flags |= SS_RESET;
	if (reg & I365_PC_IOCARD)
		state->flags |= SS_IOCARD; /* This is an IO card */

	/* Set the IRQ number */
	state->io_irq = socket->socket.pci_irq;

	/*
	 * Card status change
	 * CSCICR, Card Status Change Interrupt Configuration
	 */
	reg = indirect_read(socket, I365_CSCINT);

	if (reg & I365_CSC_DETECT)
		state->csc_mask |= SS_DETECT; /* Card detect is enabled */

	if (state->flags & SS_IOCARD) {/* IO Cards behave different */
		if (reg & I365_CSC_STSCHG)
			state->csc_mask |= SS_STSCHG;
	} else {
		if (reg & I365_CSC_BVD1)
			state->csc_mask |= SS_BATDEAD;
		if (reg & I365_CSC_BVD2)
			state->csc_mask |= SS_BATWARN;
		if (reg & I365_CSC_READY)
			state->csc_mask |= SS_READY;
	}

	return 0;
}

static int pd6729_set_socket(struct pcmcia_socket *sock, socket_state_t *state)
{
	struct pd6729_socket *socket = container_of(sock, struct pd6729_socket, socket);
	unsigned char reg;

	/* First, set the global controller options */

	set_bridge_state(socket);

	/* Values for the IGENC register */

	reg = 0;
 	/* The reset bit has "inverse" logic */
	if (!(state->flags & SS_RESET))
		reg = reg | I365_PC_RESET;
	if (state->flags & SS_IOCARD)
		reg = reg | I365_PC_IOCARD;

	/* IGENC, Interrupt and General Control Register */
	indirect_write(socket, I365_INTCTL, reg);

	/* Power registers */

	reg = I365_PWR_NORESET; /* default: disable resetdrv on resume */

	if (state->flags & SS_PWR_AUTO) {
		dprintk("Auto power\n");
		reg |= I365_PWR_AUTO;	/* automatic power mngmnt */
	}
	if (state->flags & SS_OUTPUT_ENA) {
		dprintk("Power Enabled\n");
		reg |= I365_PWR_OUT;	/* enable power */