linux/drivers/misc/tifm_7xx1.c

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/*
* tifm_7xx1.c - TI FlashMedia driver
*
* Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/tifm.h>
#include <linux/dma-mapping.h>
#include <linux/freezer.h>
#define DRIVER_NAME "tifm_7xx1"
#define DRIVER_VERSION "0.7"
static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
{
unsigned long flags;
spin_lock_irqsave(&fm->lock, flags);
fm->socket_change_set |= 1 << sock->socket_id;
wake_up_all(&fm->change_set_notify);
spin_unlock_irqrestore(&fm->lock, flags);
}
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 tifm_7xx1_isr(int irq, void *dev_id)
{
struct tifm_adapter *fm = dev_id;
struct tifm_dev *sock;
unsigned int irq_status;
unsigned int sock_irq_status, cnt;
spin_lock(&fm->lock);
irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
if (irq_status == 0 || irq_status == (~0)) {
spin_unlock(&fm->lock);
return IRQ_NONE;
}
if (irq_status & TIFM_IRQ_ENABLE) {
writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
for (cnt = 0; cnt < fm->num_sockets; cnt++) {
sock = fm->sockets[cnt];
sock_irq_status = (irq_status >> cnt)
& (TIFM_IRQ_FIFOMASK(1)
| TIFM_IRQ_CARDMASK(1));
if (sock && sock_irq_status)
sock->signal_irq(sock, sock_irq_status);
}
fm->socket_change_set |= irq_status
& ((1 << fm->num_sockets) - 1);
}
writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
if (!fm->socket_change_set)
writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
else
wake_up_all(&fm->change_set_notify);
spin_unlock(&fm->lock);
return IRQ_HANDLED;
}
static tifm_media_id tifm_7xx1_toggle_sock_power(char __iomem *sock_addr,
int is_x2)
{
unsigned int s_state;
int cnt;
writel(0x0e00, sock_addr + SOCK_CONTROL);
for (cnt = 0; cnt < 100; cnt++) {
if (!(TIFM_SOCK_STATE_POWERED
& readl(sock_addr + SOCK_PRESENT_STATE)))
break;
msleep(10);
}
s_state = readl(sock_addr + SOCK_PRESENT_STATE);
if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
return FM_NULL;
if (is_x2) {
writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
} else {
// SmartMedia cards need extra 40 msec
if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7) == 1)
msleep(40);
writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
sock_addr + SOCK_CONTROL);
msleep(10);
writel((s_state & 0x7) | 0x0c00 | TIFM_CTRL_LED,
sock_addr + SOCK_CONTROL);
}
for (cnt = 0; cnt < 100; cnt++) {
if ((TIFM_SOCK_STATE_POWERED
& readl(sock_addr + SOCK_PRESENT_STATE)))
break;
msleep(10);
}
if (!is_x2)
writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
sock_addr + SOCK_CONTROL);
return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
}
inline static char __iomem *
tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
{
return base_addr + ((sock_num + 1) << 10);
}
static int tifm_7xx1_switch_media(void *data)
{
struct tifm_adapter *fm = data;
unsigned long flags;
tifm_media_id media_id;
char *card_name = "xx";
int cnt, rc;
struct tifm_dev *sock;
unsigned int socket_change_set;
while (1) {
rc = wait_event_interruptible(fm->change_set_notify,
fm->socket_change_set);
if (rc == -ERESTARTSYS)
try_to_freeze();
spin_lock_irqsave(&fm->lock, flags);
socket_change_set = fm->socket_change_set;
fm->socket_change_set = 0;
dev_dbg(fm->dev, "checking media set %x\n",
socket_change_set);
if (kthread_should_stop())
socket_change_set = (1 << fm->num_sockets) - 1;
spin_unlock_irqrestore(&fm->lock, flags);
if (!socket_change_set)
continue;
spin_lock_irqsave(&fm->lock, flags);
for (cnt = 0; cnt < fm->num_sockets; cnt++) {
if (!(socket_change_set & (1 << cnt)))
continue;
sock = fm->sockets[cnt];
if (sock) {
printk(KERN_INFO DRIVER_NAME
": demand removing card from socket %d\n",
cnt);
fm->sockets[cnt] = NULL;
spin_unlock_irqrestore(&fm->lock, flags);
device_unregister(&sock->dev);
spin_lock_irqsave(&fm->lock, flags);
writel(0x0e00,
tifm_7xx1_sock_addr(fm->addr, cnt)
+ SOCK_CONTROL);
}
if (kthread_should_stop())
continue;
spin_unlock_irqrestore(&fm->lock, flags);
media_id = tifm_7xx1_toggle_sock_power(
tifm_7xx1_sock_addr(fm->addr, cnt),
fm->num_sockets == 2);
if (media_id) {
sock = tifm_alloc_device(fm);
if (sock) {
sock->addr = tifm_7xx1_sock_addr(fm->addr,
cnt);
sock->media_id = media_id;
sock->socket_id = cnt;
switch (media_id) {
case 1:
card_name = "xd";
break;
case 2:
card_name = "ms";
break;
case 3:
card_name = "sd";
break;
default:
tifm_free_device(&sock->dev);
spin_lock_irqsave(&fm->lock, flags);
continue;
}
snprintf(sock->dev.bus_id, BUS_ID_SIZE,
"tifm_%s%u:%u", card_name,
fm->id, cnt);
printk(KERN_INFO DRIVER_NAME
": %s card detected in socket %d\n",
card_name, cnt);
if (!device_register(&sock->dev)) {
spin_lock_irqsave(&fm->lock, flags);
if (!fm->sockets[cnt]) {
fm->sockets[cnt] = sock;
sock = NULL;
}
spin_unlock_irqrestore(&fm->lock, flags);
}
if (sock)
tifm_free_device(&sock->dev);
}
spin_lock_irqsave(&fm->lock, flags);
}
}
if (!kthread_should_stop()) {
writel(TIFM_IRQ_FIFOMASK(socket_change_set)
| TIFM_IRQ_CARDMASK(socket_change_set),
fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
writel(TIFM_IRQ_FIFOMASK(socket_change_set)
| TIFM_IRQ_CARDMASK(socket_change_set),
fm->addr + FM_SET_INTERRUPT_ENABLE);
writel(TIFM_IRQ_ENABLE,
fm->addr + FM_SET_INTERRUPT_ENABLE);
spin_unlock_irqrestore(&fm->lock, flags);
} else {
for (cnt = 0; cnt < fm->num_sockets; cnt++) {
if (fm->sockets[cnt])
fm->socket_change_set |= 1 << cnt;
}
if (!fm->socket_change_set) {
spin_unlock_irqrestore(&fm->lock, flags);
return 0;
} else {
spin_unlock_irqrestore(&fm->lock, flags);
}
}
}
return 0;
}
#ifdef CONFIG_PM
static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
{
dev_dbg(&dev->dev, "suspending host\n");
pci_save_state(dev);
pci_enable_wake(dev, pci_choose_state(dev, state), 0);
pci_disable_device(dev);
pci_set_power_state(dev, pci_choose_state(dev, state));
return 0;
}
static int tifm_7xx1_resume(struct pci_dev *dev)
{
struct tifm_adapter *fm = pci_get_drvdata(dev);
int cnt, rc;
unsigned long flags;
tifm_media_id new_ids[fm->num_sockets];
pci_set_power_state(dev, PCI_D0);
pci_restore_state(dev);
rc = pci_enable_device(dev);
if (rc)
return rc;
pci_set_master(dev);
dev_dbg(&dev->dev, "resuming host\n");
for (cnt = 0; cnt < fm->num_sockets; cnt++)
new_ids[cnt] = tifm_7xx1_toggle_sock_power(
tifm_7xx1_sock_addr(fm->addr, cnt),
fm->num_sockets == 2);
spin_lock_irqsave(&fm->lock, flags);
fm->socket_change_set = 0;
for (cnt = 0; cnt < fm->num_sockets; cnt++) {
if (fm->sockets[cnt]) {
if (fm->sockets[cnt]->media_id == new_ids[cnt])
fm->socket_change_set |= 1 << cnt;
fm->sockets[cnt]->media_id = new_ids[cnt];
}
}
writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
fm->addr + FM_SET_INTERRUPT_ENABLE);
if (!fm->socket_change_set) {
spin_unlock_irqrestore(&fm->lock, flags);
return 0;
} else {
fm->socket_change_set = 0;
spin_unlock_irqrestore(&fm->lock, flags);
}
wait_event_timeout(fm->change_set_notify, fm->socket_change_set, HZ);
spin_lock_irqsave(&fm->lock, flags);
writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
| TIFM_IRQ_CARDMASK(fm->socket_change_set),
fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
| TIFM_IRQ_CARDMASK(fm->socket_change_set),
fm->addr + FM_SET_INTERRUPT_ENABLE);
writel(TIFM_IRQ_ENABLE,
fm->addr + FM_SET_INTERRUPT_ENABLE);
fm->socket_change_set = 0;
spin_unlock_irqrestore(&fm->lock, flags);
return 0;
}
#else
#define tifm_7xx1_suspend NULL
#define tifm_7xx1_resume NULL
#endif /* CONFIG_PM */
static int tifm_7xx1_probe(struct pci_dev *dev,
const struct pci_device_id *dev_id)
{
struct tifm_adapter *fm;
int pci_dev_busy = 0;
int rc;
rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
if (rc)
return rc;
rc = pci_enable_device(dev);
if (rc)
return rc;
pci_set_master(dev);
rc = pci_request_regions(dev, DRIVER_NAME);
if (rc) {
pci_dev_busy = 1;
goto err_out;
}
pci_intx(dev, 1);
fm = tifm_alloc_adapter();
if (!fm) {
rc = -ENOMEM;
goto err_out_int;
}
fm->dev = &dev->dev;
fm->num_sockets = (dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM)
? 4 : 2;
fm->sockets = kzalloc(sizeof(struct tifm_dev*) * fm->num_sockets,
GFP_KERNEL);
if (!fm->sockets)
goto err_out_free;
fm->eject = tifm_7xx1_eject;
pci_set_drvdata(dev, fm);
fm->addr = ioremap(pci_resource_start(dev, 0),
pci_resource_len(dev, 0));
if (!fm->addr)
goto err_out_free;
rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
if (rc)
goto err_out_unmap;
init_waitqueue_head(&fm->change_set_notify);
rc = tifm_add_adapter(fm, tifm_7xx1_switch_media);
if (rc)
goto err_out_irq;
writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
fm->addr + FM_SET_INTERRUPT_ENABLE);
wake_up_process(fm->media_switcher);
return 0;
err_out_irq:
free_irq(dev->irq, fm);
err_out_unmap:
iounmap(fm->addr);
err_out_free:
pci_set_drvdata(dev, NULL);
tifm_free_adapter(fm);
err_out_int:
pci_intx(dev, 0);
pci_release_regions(dev);
err_out:
if (!pci_dev_busy)
pci_disable_device(dev);
return rc;
}
static void tifm_7xx1_remove(struct pci_dev *dev)
{
struct tifm_adapter *fm = pci_get_drvdata(dev);
unsigned long flags;
writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
mmiowb();
free_irq(dev->irq, fm);
spin_lock_irqsave(&fm->lock, flags);
fm->socket_change_set = (1 << fm->num_sockets) - 1;
spin_unlock_irqrestore(&fm->lock, flags);
kthread_stop(fm->media_switcher);
tifm_remove_adapter(fm);
pci_set_drvdata(dev, NULL);
iounmap(fm->addr);
pci_intx(dev, 0);
pci_release_regions(dev);
pci_disable_device(dev);
tifm_free_adapter(fm);
}
static struct pci_device_id tifm_7xx1_pci_tbl [] = {
{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
PCI_ANY_ID, 0, 0, 0 },
{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
PCI_ANY_ID, 0, 0, 0 },
{ }
};
static struct pci_driver tifm_7xx1_driver = {
.name = DRIVER_NAME,
.id_table = tifm_7xx1_pci_tbl,
.probe = tifm_7xx1_probe,
.remove = tifm_7xx1_remove,
.suspend = tifm_7xx1_suspend,
.resume = tifm_7xx1_resume,
};
static int __init tifm_7xx1_init(void)
{
return pci_register_driver(&tifm_7xx1_driver);
}
static void __exit tifm_7xx1_exit(void)
{
pci_unregister_driver(&tifm_7xx1_driver);
}
MODULE_AUTHOR("Alex Dubov");
MODULE_DESCRIPTION("TI FlashMedia host driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
MODULE_VERSION(DRIVER_VERSION);
module_init(tifm_7xx1_init);
module_exit(tifm_7xx1_exit);