linux/drivers/pcmcia/i82092.c

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/*
* 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 <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 struct pci_driver i82092aa_pci_driver = {
.name = "i82092aa",
.id_table = i82092aa_pci_ids,
.probe = i82092aa_pci_probe,
.remove = __devexit_p(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 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 */
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 __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.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\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, IRQF_SHARED, "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.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 __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 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 */
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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 \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)
{
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\n");
reg |= I365_PWR_AUTO; /* automatic power mngmnt */
}
if (state->flags & SS_OUTPUT_ENA) {
printk("Power Enabled \n");
reg |= I365_PWR_OUT; /* enable power */
}
switch (state->Vcc) {
case 0:
break;
case 50:
printk("setting voltage to Vcc to 5V on socket %i\n",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\n",sock);
break;
case 50:
printk("setting Vpp to 5.0 for socket %i\n",sock);
reg |= I365_VPP1_5V | I365_VPP2_5V;
break;
case 120:
printk("setting Vpp to 12.0\n");
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 \n",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, &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\n",
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 \n",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\n",sock);*/
i |= I365_MEM_REG;
} else {
/* printk("requesting normal memory for socket %i\n",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);