WSL2-Linux-Kernel/drivers/pcmcia/pd6729.c

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/*
* 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/module.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/io.h>
#include <pcmcia/ss.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 <komurojun-mbn@nifty.com>");
#define MAX_SOCKETS 2
/*
* simple helper functions
* External clock time, in nanoseconds. 120 ns = 8.33 MHz
*/
#define to_cycles(ns) ((ns)/120)
#ifndef NO_IRQ
#define NO_IRQ ((unsigned int)(0))
#endif
/*
* PARAMETERS
* irq_mode=n
* Specifies the interrupt delivery mode. The default (1) is to use PCI
* interrupts; a value of 0 selects ISA interrupts. This must be set for
* correct operation of PCI card readers.
*/
static int irq_mode = 1; /* 0 = ISA interrupt, 1 = PCI interrupt */
module_param(irq_mode, int, 0444);
MODULE_PARM_DESC(irq_mode,
"interrupt delivery mode. 0 = ISA, 1 = PCI. default is 1");
static DEFINE_SPINLOCK(port_lock);
/* 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 */
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 17:55:46 +04:00
static irqreturn_t pd6729_interrupt(int irq, void *dev)
{
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;
dev_vdbg(&socket[i].socket.dev,
"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 pd6729_interrupt_wrapper(unsigned long data)
{
struct pd6729_socket *socket = (struct pd6729_socket *) data;
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 17:55:46 +04:00
pd6729_interrupt(0, (void *)socket);
mod_timer(&socket->poll_timer, jiffies + HZ);
}
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_set_socket(struct pcmcia_socket *sock, socket_state_t *state)
{
struct pd6729_socket *socket
= container_of(sock, struct pd6729_socket, socket);
unsigned char reg, data;
/* First, set the global controller options */
indirect_write(socket, I365_GBLCTL, 0x00);
indirect_write(socket, I365_GENCTL, 0x00);
/* Values for the IGENC register */
socket->card_irq = state->io_irq;
reg = 0;
/* The reset bit has "inverse" logic */
if (!(state->flags & SS_RESET))
reg |= I365_PC_RESET;
if (state->flags & SS_IOCARD)
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) {
dev_dbg(&sock->dev, "Auto power\n");
reg |= I365_PWR_AUTO; /* automatic power mngmnt */
}
if (state->flags & SS_OUTPUT_ENA) {
dev_dbg(&sock->dev, "Power Enabled\n");
reg |= I365_PWR_OUT; /* enable power */
}
switch (state->Vcc) {
case 0:
break;
case 33:
dev_dbg(&sock->dev,
"setting voltage to Vcc to 3.3V on socket %i\n",
socket->number);
reg |= I365_VCC_5V;
indirect_setbit(socket, PD67_MISC_CTL_1, PD67_MC1_VCC_3V);
break;
case 50:
dev_dbg(&sock->dev,
"setting voltage to Vcc to 5V on socket %i\n",
socket->number);
reg |= I365_VCC_5V;
indirect_resetbit(socket, PD67_MISC_CTL_1, PD67_MC1_VCC_3V);
break;
default:
dev_dbg(&sock->dev,
"pd6729_set_socket called with invalid VCC power "
"value: %i\n", state->Vcc);
return -EINVAL;
}
switch (state->Vpp) {
case 0:
dev_dbg(&sock->dev, "not setting Vpp on socket %i\n",
socket->number);
break;
case 33:
case 50:
dev_dbg(&sock->dev, "setting Vpp to Vcc for socket %i\n",
socket->number);
reg |= I365_VPP1_5V;
break;
case 120:
dev_dbg(&sock->dev, "setting Vpp to 12.0\n");
reg |= I365_VPP1_12V;
break;
default:
dev_dbg(&sock->dev, "pd6729: pd6729_set_socket called with "
"invalid VPP power value: %i\n", state->Vpp);
return -EINVAL;
}
/* only write if changed */
if (reg != indirect_read(socket, I365_POWER))
indirect_write(socket, I365_POWER, reg);
if (irq_mode == 1) {
/* all interrupts are to be done as PCI interrupts */
data = PD67_EC1_INV_MGMT_IRQ | PD67_EC1_INV_CARD_IRQ;
} else
data = 0;
indirect_write(socket, PD67_EXT_INDEX, PD67_EXT_CTL_1);
indirect_write(socket, PD67_EXT_DATA, data);
/* 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;
}
if (irq_mode == 1)
reg |= 0x30; /* management IRQ: PCI INTA# = "irq 3" */
indirect_write(socket, I365_CSCINT, reg);
reg = indirect_read(socket, I365_INTCTL);
if (irq_mode == 1)
reg |= 0x03; /* card IRQ: PCI INTA# = "irq 3" */
else
reg |= socket->card_irq;
indirect_write(socket, I365_INTCTL, reg);
/* now clear the (probably bogus) pending stuff by doing a dummy read */
(void)indirect_read(socket, I365_CSC);
return 0;
}
static int pd6729_set_io_map(struct pcmcia_socket *sock,
struct pccard_io_map *io)
{
struct pd6729_socket *socket
= container_of(sock, struct pd6729_socket, socket);
unsigned char map, ioctl;
map = io->map;
/* Check error conditions */
if (map > 1) {
dev_dbg(&sock->dev, "pd6729_set_io_map with invalid map\n");
return -EINVAL;
}
/* Turn off the window before changing anything */
if (indirect_read(socket, I365_ADDRWIN) & I365_ENA_IO(map))
indirect_resetbit(socket, I365_ADDRWIN, I365_ENA_IO(map));
/* dev_dbg(&sock->dev, "set_io_map: Setting range to %x - %x\n",
io->start, io->stop);*/
/* write the new values */
indirect_write16(socket, I365_IO(map)+I365_W_START, io->start);
indirect_write16(socket, I365_IO(map)+I365_W_STOP, io->stop);
ioctl = indirect_read(socket, I365_IOCTL) & ~I365_IOCTL_MASK(map);
if (io->flags & MAP_0WS)
ioctl |= I365_IOCTL_0WS(map);
if (io->flags & MAP_16BIT)
ioctl |= I365_IOCTL_16BIT(map);
if (io->flags & MAP_AUTOSZ)
ioctl |= I365_IOCTL_IOCS16(map);
indirect_write(socket, I365_IOCTL, ioctl);
/* Turn the window back on if needed */
if (io->flags & MAP_ACTIVE)
indirect_setbit(socket, I365_ADDRWIN, I365_ENA_IO(map));
return 0;
}
static int pd6729_set_mem_map(struct pcmcia_socket *sock,
struct pccard_mem_map *mem)
{
struct pd6729_socket *socket
= container_of(sock, struct pd6729_socket, socket);
unsigned short base, i;
unsigned char map;
map = mem->map;
if (map > 4) {
dev_warn(&sock->dev, "invalid map requested\n");
return -EINVAL;
}
if ((mem->res->start > mem->res->end) || (mem->speed > 1000)) {
dev_warn(&sock->dev, "invalid invalid address / speed\n");
return -EINVAL;
}
/* Turn off the window before changing anything */
if (indirect_read(socket, I365_ADDRWIN) & I365_ENA_MEM(map))
indirect_resetbit(socket, I365_ADDRWIN, I365_ENA_MEM(map));
/* write the start address */
base = I365_MEM(map);
i = (mem->res->start >> 12) & 0x0fff;
if (mem->flags & MAP_16BIT)
i |= I365_MEM_16BIT;
if (mem->flags & MAP_0WS)
i |= I365_MEM_0WS;
indirect_write16(socket, base + I365_W_START, i);
/* write the stop address */
i = (mem->res->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(socket, base + I365_W_STOP, i);
/* Take care of high byte */
indirect_write(socket, PD67_EXT_INDEX, PD67_MEM_PAGE(map));
indirect_write(socket, PD67_EXT_DATA, mem->res->start >> 24);
/* card start */
i = ((mem->card_start - mem->res->start) >> 12) & 0x3fff;
if (mem->flags & MAP_WRPROT)
i |= I365_MEM_WRPROT;
if (mem->flags & MAP_ATTRIB) {
/* dev_dbg(&sock->dev, "requesting attribute memory for "
"socket %i\n", socket->number);*/
i |= I365_MEM_REG;
} else {
/* dev_dbg(&sock->dev, "requesting normal memory for "
"socket %i\n", socket->number);*/
}
indirect_write16(socket, base + I365_W_OFF, i);
/* Enable the window if necessary */
if (mem->flags & MAP_ACTIVE)
indirect_setbit(socket, I365_ADDRWIN, I365_ENA_MEM(map));
return 0;
}
static int pd6729_init(struct pcmcia_socket *sock)
{
int i;
struct resource res = { .end = 0x0fff };
pccard_io_map io = { 0, 0, 0, 0, 1 };
pccard_mem_map mem = { .res = &res, };
pd6729_set_socket(sock, &dead_socket);
for (i = 0; i < 2; i++) {
io.map = i;
pd6729_set_io_map(sock, &io);
}
for (i = 0; i < 5; i++) {
mem.map = i;
pd6729_set_mem_map(sock, &mem);
}
return 0;
}
/* the pccard structure and its functions */
static struct pccard_operations pd6729_operations = {
.init = pd6729_init,
.get_status = pd6729_get_status,
.set_socket = pd6729_set_socket,
.set_io_map = pd6729_set_io_map,
.set_mem_map = pd6729_set_mem_map,
};
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 17:55:46 +04:00
static irqreturn_t pd6729_test(int irq, void *dev)
{
pr_devel("-> hit on irq %d\n", irq);
return IRQ_HANDLED;
}
static int pd6729_check_irq(int irq)
{
int ret;
ret = request_irq(irq, pd6729_test, IRQF_PROBE_SHARED, "x",
pd6729_test);
if (ret)
return -1;
free_irq(irq, pd6729_test);
return 0;
}
static u_int pd6729_isa_scan(void)
{
u_int mask0, mask = 0;
int i;
if (irq_mode == 1) {
printk(KERN_INFO "pd6729: PCI card interrupts, "
"PCI status changes\n");
return 0;
}
mask0 = PD67_MASK;
/* just find interrupts that aren't in use */
for (i = 0; i < 16; i++)
if ((mask0 & (1 << i)) && (pd6729_check_irq(i) == 0))
mask |= (1 << i);
printk(KERN_INFO "pd6729: ISA irqs = ");
for (i = 0; i < 16; i++)
if (mask & (1<<i))
printk("%s%d", ((mask & ((1<<i)-1)) ? "," : ""), i);
if (mask == 0)
printk("none!");
else
printk(" polling status changes.\n");
return mask;
}
static int pd6729_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
int i, j, ret;
u_int mask;
char configbyte;
struct pd6729_socket *socket;
socket = kzalloc(sizeof(struct pd6729_socket) * MAX_SOCKETS,
GFP_KERNEL);
if (!socket) {
dev_warn(&dev->dev, "failed to kzalloc socket.\n");
return -ENOMEM;
}
ret = pci_enable_device(dev);
if (ret) {
dev_warn(&dev->dev, "failed to enable pci_device.\n");
goto err_out_free_mem;
}
if (!pci_resource_start(dev, 0)) {
dev_warn(&dev->dev, "refusing to load the driver as the "
"io_base is NULL.\n");
ret = -ENOMEM;
goto err_out_disable;
}
dev_info(&dev->dev, "Cirrus PD6729 PCI to PCMCIA Bridge at 0x%llx "
"on irq %d\n",
(unsigned long long)pci_resource_start(dev, 0), dev->irq);
/*
* Since we have no memory BARs some firmware may not
* have had PCI_COMMAND_MEMORY enabled, yet the device needs it.
*/
pci_read_config_byte(dev, PCI_COMMAND, &configbyte);
if (!(configbyte & PCI_COMMAND_MEMORY)) {
dev_dbg(&dev->dev, "pd6729: Enabling PCI_COMMAND_MEMORY.\n");
configbyte |= PCI_COMMAND_MEMORY;
pci_write_config_byte(dev, PCI_COMMAND, configbyte);
}
ret = pci_request_regions(dev, "pd6729");
if (ret) {
dev_warn(&dev->dev, "pci request region failed.\n");
goto err_out_disable;
}
if (dev->irq == NO_IRQ)
irq_mode = 0; /* fall back to ISA interrupt mode */
mask = pd6729_isa_scan();
if (irq_mode == 0 && mask == 0) {
dev_warn(&dev->dev, "no ISA interrupt is available.\n");
ret = -ENODEV;
goto err_out_free_res;
}
for (i = 0; i < MAX_SOCKETS; i++) {
socket[i].io_base = pci_resource_start(dev, 0);
socket[i].socket.features |= SS_CAP_PAGE_REGS | SS_CAP_PCCARD;
socket[i].socket.map_size = 0x1000;
socket[i].socket.irq_mask = mask;
socket[i].socket.pci_irq = dev->irq;
socket[i].socket.cb_dev = dev;
socket[i].socket.owner = THIS_MODULE;
socket[i].number = i;
socket[i].socket.ops = &pd6729_operations;
socket[i].socket.resource_ops = &pccard_nonstatic_ops;
socket[i].socket.dev.parent = &dev->dev;
socket[i].socket.driver_data = &socket[i];
}
pci_set_drvdata(dev, socket);
if (irq_mode == 1) {
/* Register the interrupt handler */
ret = request_irq(dev->irq, pd6729_interrupt, IRQF_SHARED,
"pd6729", socket);
if (ret) {
dev_err(&dev->dev, "Failed to register irq %d\n",
dev->irq);
goto err_out_free_res;
}
} else {
/* poll Card status change */
setup_timer(&socket->poll_timer, pd6729_interrupt_wrapper,
(unsigned long)socket);
mod_timer(&socket->poll_timer, jiffies + HZ);
}
for (i = 0; i < MAX_SOCKETS; i++) {
ret = pcmcia_register_socket(&socket[i].socket);
if (ret) {
dev_warn(&dev->dev, "pcmcia_register_socket failed.\n");
for (j = 0; j < i ; j++)
pcmcia_unregister_socket(&socket[j].socket);
goto err_out_free_res2;
}
}
return 0;
err_out_free_res2:
if (irq_mode == 1)
free_irq(dev->irq, socket);
else
del_timer_sync(&socket->poll_timer);
err_out_free_res:
pci_release_regions(dev);
err_out_disable:
pci_disable_device(dev);
err_out_free_mem:
kfree(socket);
return ret;
}
static void pd6729_pci_remove(struct pci_dev *dev)
{
int i;
struct pd6729_socket *socket = pci_get_drvdata(dev);
for (i = 0; i < MAX_SOCKETS; i++) {
/* Turn off all interrupt sources */
indirect_write(&socket[i], I365_CSCINT, 0);
indirect_write(&socket[i], I365_INTCTL, 0);
pcmcia_unregister_socket(&socket[i].socket);
}
if (irq_mode == 1)
free_irq(dev->irq, socket);
else
del_timer_sync(&socket->poll_timer);
pci_release_regions(dev);
pci_disable_device(dev);
kfree(socket);
}
static const struct pci_device_id pd6729_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_6729) },
{ }
};
MODULE_DEVICE_TABLE(pci, pd6729_pci_ids);
static struct pci_driver pd6729_pci_driver = {
.name = "pd6729",
.id_table = pd6729_pci_ids,
.probe = pd6729_pci_probe,
.remove = pd6729_pci_remove,
};
module_pci_driver(pd6729_pci_driver);