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android_kernel_samsung_msm8976/drivers/media/video/cx88/cx88-mpeg.c
David Howells 7d12e780e0 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 15:10:12 +01:00

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/*
*
* Support for the mpeg transport stream transfers
* PCI function #2 of the cx2388x.
*
* (c) 2004 Jelle Foks <jelle@foks.8m.com>
* (c) 2004 Chris Pascoe <c.pascoe@itee.uq.edu.au>
* (c) 2004 Gerd Knorr <kraxel@bytesex.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <asm/delay.h>
#include "cx88.h"
/* ------------------------------------------------------------------ */
MODULE_DESCRIPTION("mpeg driver for cx2388x based TV cards");
MODULE_AUTHOR("Jelle Foks <jelle@foks.8m.com>");
MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
MODULE_LICENSE("GPL");
static unsigned int debug = 0;
module_param(debug,int,0644);
MODULE_PARM_DESC(debug,"enable debug messages [mpeg]");
#define dprintk(level,fmt, arg...) if (debug >= level) \
printk(KERN_DEBUG "%s/2: " fmt, dev->core->name , ## arg)
/* ------------------------------------------------------------------ */
static int cx8802_start_dma(struct cx8802_dev *dev,
struct cx88_dmaqueue *q,
struct cx88_buffer *buf)
{
struct cx88_core *core = dev->core;
dprintk(1, "cx8802_start_dma w: %d, h: %d, f: %d\n", dev->width, dev->height, buf->vb.field);
/* setup fifo + format */
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH28],
dev->ts_packet_size, buf->risc.dma);
/* write TS length to chip */
cx_write(MO_TS_LNGTH, buf->vb.width);
/* FIXME: this needs a review.
* also: move to cx88-blackbird + cx88-dvb source files? */
if (cx88_boards[core->board].mpeg == (CX88_MPEG_DVB | CX88_MPEG_BLACKBIRD) ) {
/* Report a warning until the mini driver patch is applied,
* else the following conditions will set the dma registers incorrectly.
* This will be removed in the next major patch and changes to the conditions
* will be made.
*/
printk(KERN_INFO "%s() board->(CX88_MPEG_DVB | CX88_MPEG_BLACKBIRD) is invalid\n", __FUNCTION__);
return -EINVAL;
}
if (cx88_boards[core->board].mpeg & CX88_MPEG_DVB) {
/* negedge driven & software reset */
cx_write(TS_GEN_CNTRL, 0x0040 | dev->ts_gen_cntrl);
udelay(100);
cx_write(MO_PINMUX_IO, 0x00);
cx_write(TS_HW_SOP_CNTRL,0x47<<16|188<<4|0x01);
switch (core->board) {
case CX88_BOARD_DVICO_FUSIONHDTV_3_GOLD_Q:
case CX88_BOARD_DVICO_FUSIONHDTV_3_GOLD_T:
case CX88_BOARD_DVICO_FUSIONHDTV_5_GOLD:
case CX88_BOARD_PCHDTV_HD5500:
cx_write(TS_SOP_STAT, 1<<13);
break;
case CX88_BOARD_HAUPPAUGE_NOVASPLUS_S1:
case CX88_BOARD_HAUPPAUGE_NOVASE2_S1:
cx_write(MO_PINMUX_IO, 0x88); /* Enable MPEG parallel IO and video signal pins */
udelay(100);
break;
default:
cx_write(TS_SOP_STAT, 0x00);
break;
}
cx_write(TS_GEN_CNTRL, dev->ts_gen_cntrl);
udelay(100);
}
if (cx88_boards[core->board].mpeg & CX88_MPEG_BLACKBIRD) {
cx_write(MO_PINMUX_IO, 0x88); /* enable MPEG parallel IO */
cx_write(TS_GEN_CNTRL, 0x46); /* punctured clock TS & posedge driven & software reset */
udelay(100);
cx_write(TS_HW_SOP_CNTRL, 0x408); /* mpeg start byte */
cx_write(TS_VALERR_CNTRL, 0x2000);
cx_write(TS_GEN_CNTRL, 0x06); /* punctured clock TS & posedge driven */
udelay(100);
}
/* reset counter */
cx_write(MO_TS_GPCNTRL, GP_COUNT_CONTROL_RESET);
q->count = 1;
/* enable irqs */
dprintk( 1, "setting the interrupt mask\n" );
cx_set(MO_PCI_INTMSK, core->pci_irqmask | 0x04);
cx_set(MO_TS_INTMSK, 0x1f0011);
/* start dma */
cx_set(MO_DEV_CNTRL2, (1<<5));
cx_set(MO_TS_DMACNTRL, 0x11);
return 0;
}
static int cx8802_stop_dma(struct cx8802_dev *dev)
{
struct cx88_core *core = dev->core;
dprintk( 1, "cx8802_stop_dma\n" );
/* stop dma */
cx_clear(MO_TS_DMACNTRL, 0x11);
/* disable irqs */
cx_clear(MO_PCI_INTMSK, 0x000004);
cx_clear(MO_TS_INTMSK, 0x1f0011);
/* Reset the controller */
cx_write(TS_GEN_CNTRL, 0xcd);
return 0;
}
static int cx8802_restart_queue(struct cx8802_dev *dev,
struct cx88_dmaqueue *q)
{
struct cx88_buffer *buf;
struct list_head *item;
dprintk( 1, "cx8802_restart_queue\n" );
if (list_empty(&q->active))
{
struct cx88_buffer *prev;
prev = NULL;
dprintk(1, "cx8802_restart_queue: queue is empty\n" );
for (;;) {
if (list_empty(&q->queued))
return 0;
buf = list_entry(q->queued.next, struct cx88_buffer, vb.queue);
if (NULL == prev) {
list_del(&buf->vb.queue);
list_add_tail(&buf->vb.queue,&q->active);
cx8802_start_dma(dev, q, buf);
buf->vb.state = STATE_ACTIVE;
buf->count = q->count++;
mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(1,"[%p/%d] restart_queue - first active\n",
buf,buf->vb.i);
} else if (prev->vb.width == buf->vb.width &&
prev->vb.height == buf->vb.height &&
prev->fmt == buf->fmt) {
list_del(&buf->vb.queue);
list_add_tail(&buf->vb.queue,&q->active);
buf->vb.state = STATE_ACTIVE;
buf->count = q->count++;
prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
dprintk(1,"[%p/%d] restart_queue - move to active\n",
buf,buf->vb.i);
} else {
return 0;
}
prev = buf;
}
return 0;
}
buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
dprintk(2,"restart_queue [%p/%d]: restart dma\n",
buf, buf->vb.i);
cx8802_start_dma(dev, q, buf);
list_for_each(item,&q->active) {
buf = list_entry(item, struct cx88_buffer, vb.queue);
buf->count = q->count++;
}
mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
return 0;
}
/* ------------------------------------------------------------------ */
int cx8802_buf_prepare(struct videobuf_queue *q, struct cx8802_dev *dev,
struct cx88_buffer *buf, enum v4l2_field field)
{
int size = dev->ts_packet_size * dev->ts_packet_count;
int rc;
dprintk(1, "%s: %p\n", __FUNCTION__, buf);
if (0 != buf->vb.baddr && buf->vb.bsize < size)
return -EINVAL;
if (STATE_NEEDS_INIT == buf->vb.state) {
buf->vb.width = dev->ts_packet_size;
buf->vb.height = dev->ts_packet_count;
buf->vb.size = size;
buf->vb.field = field /*V4L2_FIELD_TOP*/;
if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
goto fail;
cx88_risc_databuffer(dev->pci, &buf->risc,
buf->vb.dma.sglist,
buf->vb.width, buf->vb.height);
}
buf->vb.state = STATE_PREPARED;
return 0;
fail:
cx88_free_buffer(q,buf);
return rc;
}
void cx8802_buf_queue(struct cx8802_dev *dev, struct cx88_buffer *buf)
{
struct cx88_buffer *prev;
struct cx88_dmaqueue *cx88q = &dev->mpegq;
dprintk( 1, "cx8802_buf_queue\n" );
/* add jump to stopper */
buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
buf->risc.jmp[1] = cpu_to_le32(cx88q->stopper.dma);
if (list_empty(&cx88q->active)) {
dprintk( 1, "queue is empty - first active\n" );
list_add_tail(&buf->vb.queue,&cx88q->active);
cx8802_start_dma(dev, cx88q, buf);
buf->vb.state = STATE_ACTIVE;
buf->count = cx88q->count++;
mod_timer(&cx88q->timeout, jiffies+BUFFER_TIMEOUT);
dprintk(1,"[%p/%d] %s - first active\n",
buf, buf->vb.i, __FUNCTION__);
} else {
dprintk( 1, "queue is not empty - append to active\n" );
prev = list_entry(cx88q->active.prev, struct cx88_buffer, vb.queue);
list_add_tail(&buf->vb.queue,&cx88q->active);
buf->vb.state = STATE_ACTIVE;
buf->count = cx88q->count++;
prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
dprintk( 1, "[%p/%d] %s - append to active\n",
buf, buf->vb.i, __FUNCTION__);
}
}
/* ----------------------------------------------------------- */
static void do_cancel_buffers(struct cx8802_dev *dev, char *reason, int restart)
{
struct cx88_dmaqueue *q = &dev->mpegq;
struct cx88_buffer *buf;
unsigned long flags;
spin_lock_irqsave(&dev->slock,flags);
while (!list_empty(&q->active)) {
buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
list_del(&buf->vb.queue);
buf->vb.state = STATE_ERROR;
wake_up(&buf->vb.done);
dprintk(1,"[%p/%d] %s - dma=0x%08lx\n",
buf, buf->vb.i, reason, (unsigned long)buf->risc.dma);
}
if (restart)
{
dprintk(1, "restarting queue\n" );
cx8802_restart_queue(dev,q);
}
spin_unlock_irqrestore(&dev->slock,flags);
}
void cx8802_cancel_buffers(struct cx8802_dev *dev)
{
struct cx88_dmaqueue *q = &dev->mpegq;
dprintk( 1, "cx8802_cancel_buffers" );
del_timer_sync(&q->timeout);
cx8802_stop_dma(dev);
do_cancel_buffers(dev,"cancel",0);
}
static void cx8802_timeout(unsigned long data)
{
struct cx8802_dev *dev = (struct cx8802_dev*)data;
dprintk(0, "%s\n",__FUNCTION__);
if (debug)
cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH28]);
cx8802_stop_dma(dev);
do_cancel_buffers(dev,"timeout",1);
}
static char *cx88_mpeg_irqs[32] = {
"ts_risci1", NULL, NULL, NULL,
"ts_risci2", NULL, NULL, NULL,
"ts_oflow", NULL, NULL, NULL,
"ts_sync", NULL, NULL, NULL,
"opc_err", "par_err", "rip_err", "pci_abort",
"ts_err?",
};
static void cx8802_mpeg_irq(struct cx8802_dev *dev)
{
struct cx88_core *core = dev->core;
u32 status, mask, count;
dprintk( 1, "cx8802_mpeg_irq\n" );
status = cx_read(MO_TS_INTSTAT);
mask = cx_read(MO_TS_INTMSK);
if (0 == (status & mask))
return;
cx_write(MO_TS_INTSTAT, status);
if (debug || (status & mask & ~0xff))
cx88_print_irqbits(core->name, "irq mpeg ",
cx88_mpeg_irqs, status, mask);
/* risc op code error */
if (status & (1 << 16)) {
printk(KERN_WARNING "%s: mpeg risc op code error\n",core->name);
cx_clear(MO_TS_DMACNTRL, 0x11);
cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH28]);
}
/* risc1 y */
if (status & 0x01) {
dprintk( 1, "wake up\n" );
spin_lock(&dev->slock);
count = cx_read(MO_TS_GPCNT);
cx88_wakeup(dev->core, &dev->mpegq, count);
spin_unlock(&dev->slock);
}
/* risc2 y */
if (status & 0x10) {
spin_lock(&dev->slock);
cx8802_restart_queue(dev,&dev->mpegq);
spin_unlock(&dev->slock);
}
/* other general errors */
if (status & 0x1f0100) {
dprintk( 0, "general errors: 0x%08x\n", status & 0x1f0100 );
spin_lock(&dev->slock);
cx8802_stop_dma(dev);
cx8802_restart_queue(dev,&dev->mpegq);
spin_unlock(&dev->slock);
}
}
#define MAX_IRQ_LOOP 10
static irqreturn_t cx8802_irq(int irq, void *dev_id)
{
struct cx8802_dev *dev = dev_id;
struct cx88_core *core = dev->core;
u32 status;
int loop, handled = 0;
for (loop = 0; loop < MAX_IRQ_LOOP; loop++) {
status = cx_read(MO_PCI_INTSTAT) & (core->pci_irqmask | 0x04);
if (0 == status)
goto out;
dprintk( 1, "cx8802_irq\n" );
dprintk( 1, " loop: %d/%d\n", loop, MAX_IRQ_LOOP );
dprintk( 1, " status: %d\n", status );
handled = 1;
cx_write(MO_PCI_INTSTAT, status);
if (status & core->pci_irqmask)
cx88_core_irq(core,status);
if (status & 0x04)
cx8802_mpeg_irq(dev);
};
if (MAX_IRQ_LOOP == loop) {
dprintk( 0, "clearing mask\n" );
printk(KERN_WARNING "%s/0: irq loop -- clearing mask\n",
core->name);
cx_write(MO_PCI_INTMSK,0);
}
out:
return IRQ_RETVAL(handled);
}
/* ----------------------------------------------------------- */
/* exported stuff */
int cx8802_init_common(struct cx8802_dev *dev)
{
struct cx88_core *core = dev->core;
int err;
/* pci init */
if (pci_enable_device(dev->pci))
return -EIO;
pci_set_master(dev->pci);
if (!pci_dma_supported(dev->pci,0xffffffff)) {
printk("%s/2: Oops: no 32bit PCI DMA ???\n",dev->core->name);
return -EIO;
}
pci_read_config_byte(dev->pci, PCI_CLASS_REVISION, &dev->pci_rev);
pci_read_config_byte(dev->pci, PCI_LATENCY_TIMER, &dev->pci_lat);
printk(KERN_INFO "%s/2: found at %s, rev: %d, irq: %d, "
"latency: %d, mmio: 0x%llx\n", dev->core->name,
pci_name(dev->pci), dev->pci_rev, dev->pci->irq,
dev->pci_lat,(unsigned long long)pci_resource_start(dev->pci,0));
/* initialize driver struct */
spin_lock_init(&dev->slock);
/* init dma queue */
INIT_LIST_HEAD(&dev->mpegq.active);
INIT_LIST_HEAD(&dev->mpegq.queued);
dev->mpegq.timeout.function = cx8802_timeout;
dev->mpegq.timeout.data = (unsigned long)dev;
init_timer(&dev->mpegq.timeout);
cx88_risc_stopper(dev->pci,&dev->mpegq.stopper,
MO_TS_DMACNTRL,0x11,0x00);
/* get irq */
err = request_irq(dev->pci->irq, cx8802_irq,
IRQF_SHARED | IRQF_DISABLED, dev->core->name, dev);
if (err < 0) {
printk(KERN_ERR "%s: can't get IRQ %d\n",
dev->core->name, dev->pci->irq);
return err;
}
cx_set(MO_PCI_INTMSK, core->pci_irqmask);
/* everything worked */
pci_set_drvdata(dev->pci,dev);
return 0;
}
void cx8802_fini_common(struct cx8802_dev *dev)
{
dprintk( 2, "cx8802_fini_common\n" );
cx8802_stop_dma(dev);
pci_disable_device(dev->pci);
/* unregister stuff */
free_irq(dev->pci->irq, dev);
pci_set_drvdata(dev->pci, NULL);
/* free memory */
btcx_riscmem_free(dev->pci,&dev->mpegq.stopper);
}
/* ----------------------------------------------------------- */
int cx8802_suspend_common(struct pci_dev *pci_dev, pm_message_t state)
{
struct cx8802_dev *dev = pci_get_drvdata(pci_dev);
struct cx88_core *core = dev->core;
/* stop mpeg dma */
spin_lock(&dev->slock);
if (!list_empty(&dev->mpegq.active)) {
dprintk( 2, "suspend\n" );
printk("%s: suspend mpeg\n", core->name);
cx8802_stop_dma(dev);
del_timer(&dev->mpegq.timeout);
}
spin_unlock(&dev->slock);
/* FIXME -- shutdown device */
cx88_shutdown(dev->core);
pci_save_state(pci_dev);
if (0 != pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state))) {
pci_disable_device(pci_dev);
dev->state.disabled = 1;
}
return 0;
}
int cx8802_resume_common(struct pci_dev *pci_dev)
{
struct cx8802_dev *dev = pci_get_drvdata(pci_dev);
struct cx88_core *core = dev->core;
int err;
if (dev->state.disabled) {
err=pci_enable_device(pci_dev);
if (err) {
printk(KERN_ERR "%s: can't enable device\n",
dev->core->name);
return err;
}
dev->state.disabled = 0;
}
err=pci_set_power_state(pci_dev, PCI_D0);
if (err) {
printk(KERN_ERR "%s: can't enable device\n",
dev->core->name);
pci_disable_device(pci_dev);
dev->state.disabled = 1;
return err;
}
pci_restore_state(pci_dev);
/* FIXME: re-initialize hardware */
cx88_reset(dev->core);
/* restart video+vbi capture */
spin_lock(&dev->slock);
if (!list_empty(&dev->mpegq.active)) {
printk("%s: resume mpeg\n", core->name);
cx8802_restart_queue(dev,&dev->mpegq);
}
spin_unlock(&dev->slock);
return 0;
}
/* ----------------------------------------------------------- */
EXPORT_SYMBOL(cx8802_buf_prepare);
EXPORT_SYMBOL(cx8802_buf_queue);
EXPORT_SYMBOL(cx8802_cancel_buffers);
EXPORT_SYMBOL(cx8802_init_common);
EXPORT_SYMBOL(cx8802_fini_common);
EXPORT_SYMBOL(cx8802_suspend_common);
EXPORT_SYMBOL(cx8802_resume_common);
/* ----------------------------------------------------------- */
/*
* Local variables:
* c-basic-offset: 8
* End:
* kate: eol "unix"; indent-width 3; remove-trailing-space on; replace-trailing-space-save on; tab-width 8; replace-tabs off; space-indent off; mixed-indent off
*/
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