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linux/drivers/char/mbcs.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

852 lines
20 KiB
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2005 Silicon Graphics, Inc. All rights reserved.
*/
/*
* MOATB Core Services driver.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/uio.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/tiocx.h>
#include "mbcs.h"
#define MBCS_DEBUG 0
#if MBCS_DEBUG
#define DBG(fmt...) printk(KERN_ALERT fmt)
#else
#define DBG(fmt...)
#endif
int mbcs_major;
LIST_HEAD(soft_list);
/*
* file operations
*/
struct file_operations mbcs_ops = {
.open = mbcs_open,
.llseek = mbcs_sram_llseek,
.read = mbcs_sram_read,
.write = mbcs_sram_write,
.mmap = mbcs_gscr_mmap,
};
struct mbcs_callback_arg {
int minor;
struct cx_dev *cx_dev;
};
static inline void mbcs_getdma_init(struct getdma *gdma)
{
memset(gdma, 0, sizeof(struct getdma));
gdma->DoneIntEnable = 1;
}
static inline void mbcs_putdma_init(struct putdma *pdma)
{
memset(pdma, 0, sizeof(struct putdma));
pdma->DoneIntEnable = 1;
}
static inline void mbcs_algo_init(struct algoblock *algo_soft)
{
memset(algo_soft, 0, sizeof(struct algoblock));
}
static inline void mbcs_getdma_set(void *mmr,
uint64_t hostAddr,
uint64_t localAddr,
uint64_t localRamSel,
uint64_t numPkts,
uint64_t amoEnable,
uint64_t intrEnable,
uint64_t peerIO,
uint64_t amoHostDest,
uint64_t amoModType, uint64_t intrHostDest,
uint64_t intrVector)
{
union dma_control rdma_control;
union dma_amo_dest amo_dest;
union intr_dest intr_dest;
union dma_localaddr local_addr;
union dma_hostaddr host_addr;
rdma_control.dma_control_reg = 0;
amo_dest.dma_amo_dest_reg = 0;
intr_dest.intr_dest_reg = 0;
local_addr.dma_localaddr_reg = 0;
host_addr.dma_hostaddr_reg = 0;
host_addr.dma_sys_addr = hostAddr;
MBCS_MMR_SET(mmr, MBCS_RD_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);
local_addr.dma_ram_addr = localAddr;
local_addr.dma_ram_sel = localRamSel;
MBCS_MMR_SET(mmr, MBCS_RD_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);
rdma_control.dma_op_length = numPkts;
rdma_control.done_amo_en = amoEnable;
rdma_control.done_int_en = intrEnable;
rdma_control.pio_mem_n = peerIO;
MBCS_MMR_SET(mmr, MBCS_RD_DMA_CTRL, rdma_control.dma_control_reg);
amo_dest.dma_amo_sys_addr = amoHostDest;
amo_dest.dma_amo_mod_type = amoModType;
MBCS_MMR_SET(mmr, MBCS_RD_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);
intr_dest.address = intrHostDest;
intr_dest.int_vector = intrVector;
MBCS_MMR_SET(mmr, MBCS_RD_DMA_INT_DEST, intr_dest.intr_dest_reg);
}
static inline void mbcs_putdma_set(void *mmr,
uint64_t hostAddr,
uint64_t localAddr,
uint64_t localRamSel,
uint64_t numPkts,
uint64_t amoEnable,
uint64_t intrEnable,
uint64_t peerIO,
uint64_t amoHostDest,
uint64_t amoModType,
uint64_t intrHostDest, uint64_t intrVector)
{
union dma_control wdma_control;
union dma_amo_dest amo_dest;
union intr_dest intr_dest;
union dma_localaddr local_addr;
union dma_hostaddr host_addr;
wdma_control.dma_control_reg = 0;
amo_dest.dma_amo_dest_reg = 0;
intr_dest.intr_dest_reg = 0;
local_addr.dma_localaddr_reg = 0;
host_addr.dma_hostaddr_reg = 0;
host_addr.dma_sys_addr = hostAddr;
MBCS_MMR_SET(mmr, MBCS_WR_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);
local_addr.dma_ram_addr = localAddr;
local_addr.dma_ram_sel = localRamSel;
MBCS_MMR_SET(mmr, MBCS_WR_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);
wdma_control.dma_op_length = numPkts;
wdma_control.done_amo_en = amoEnable;
wdma_control.done_int_en = intrEnable;
wdma_control.pio_mem_n = peerIO;
MBCS_MMR_SET(mmr, MBCS_WR_DMA_CTRL, wdma_control.dma_control_reg);
amo_dest.dma_amo_sys_addr = amoHostDest;
amo_dest.dma_amo_mod_type = amoModType;
MBCS_MMR_SET(mmr, MBCS_WR_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);
intr_dest.address = intrHostDest;
intr_dest.int_vector = intrVector;
MBCS_MMR_SET(mmr, MBCS_WR_DMA_INT_DEST, intr_dest.intr_dest_reg);
}
static inline void mbcs_algo_set(void *mmr,
uint64_t amoHostDest,
uint64_t amoModType,
uint64_t intrHostDest,
uint64_t intrVector, uint64_t algoStepCount)
{
union dma_amo_dest amo_dest;
union intr_dest intr_dest;
union algo_step step;
step.algo_step_reg = 0;
intr_dest.intr_dest_reg = 0;
amo_dest.dma_amo_dest_reg = 0;
amo_dest.dma_amo_sys_addr = amoHostDest;
amo_dest.dma_amo_mod_type = amoModType;
MBCS_MMR_SET(mmr, MBCS_ALG_AMO_DEST, amo_dest.dma_amo_dest_reg);
intr_dest.address = intrHostDest;
intr_dest.int_vector = intrVector;
MBCS_MMR_SET(mmr, MBCS_ALG_INT_DEST, intr_dest.intr_dest_reg);
step.alg_step_cnt = algoStepCount;
MBCS_MMR_SET(mmr, MBCS_ALG_STEP, step.algo_step_reg);
}
static inline int mbcs_getdma_start(struct mbcs_soft *soft)
{
void *mmr_base;
struct getdma *gdma;
uint64_t numPkts;
union cm_control cm_control;
mmr_base = soft->mmr_base;
gdma = &soft->getdma;
/* check that host address got setup */
if (!gdma->hostAddr)
return -1;
numPkts =
(gdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;
/* program engine */
mbcs_getdma_set(mmr_base, tiocx_dma_addr(gdma->hostAddr),
gdma->localAddr,
(gdma->localAddr < MB2) ? 0 :
(gdma->localAddr < MB4) ? 1 :
(gdma->localAddr < MB6) ? 2 : 3,
numPkts,
gdma->DoneAmoEnable,
gdma->DoneIntEnable,
gdma->peerIO,
gdma->amoHostDest,
gdma->amoModType,
gdma->intrHostDest, gdma->intrVector);
/* start engine */
cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.rd_dma_go = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
return 0;
}
static inline int mbcs_putdma_start(struct mbcs_soft *soft)
{
void *mmr_base;
struct putdma *pdma;
uint64_t numPkts;
union cm_control cm_control;
mmr_base = soft->mmr_base;
pdma = &soft->putdma;
/* check that host address got setup */
if (!pdma->hostAddr)
return -1;
numPkts =
(pdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;
/* program engine */
mbcs_putdma_set(mmr_base, tiocx_dma_addr(pdma->hostAddr),
pdma->localAddr,
(pdma->localAddr < MB2) ? 0 :
(pdma->localAddr < MB4) ? 1 :
(pdma->localAddr < MB6) ? 2 : 3,
numPkts,
pdma->DoneAmoEnable,
pdma->DoneIntEnable,
pdma->peerIO,
pdma->amoHostDest,
pdma->amoModType,
pdma->intrHostDest, pdma->intrVector);
/* start engine */
cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.wr_dma_go = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
return 0;
}
static inline int mbcs_algo_start(struct mbcs_soft *soft)
{
struct algoblock *algo_soft = &soft->algo;
void *mmr_base = soft->mmr_base;
union cm_control cm_control;
if (down_interruptible(&soft->algolock))
return -ERESTARTSYS;
atomic_set(&soft->algo_done, 0);
mbcs_algo_set(mmr_base,
algo_soft->amoHostDest,
algo_soft->amoModType,
algo_soft->intrHostDest,
algo_soft->intrVector, algo_soft->algoStepCount);
/* start algorithm */
cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.alg_done_int_en = 1;
cm_control.alg_go = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
up(&soft->algolock);
return 0;
}
static inline ssize_t
do_mbcs_sram_dmawrite(struct mbcs_soft *soft, uint64_t hostAddr,
size_t len, loff_t * off)
{
int rv = 0;
if (down_interruptible(&soft->dmawritelock))
return -ERESTARTSYS;
atomic_set(&soft->dmawrite_done, 0);
soft->putdma.hostAddr = hostAddr;
soft->putdma.localAddr = *off;
soft->putdma.bytes = len;
if (mbcs_putdma_start(soft) < 0) {
DBG(KERN_ALERT "do_mbcs_sram_dmawrite: "
"mbcs_putdma_start failed\n");
rv = -EAGAIN;
goto dmawrite_exit;
}
if (wait_event_interruptible(soft->dmawrite_queue,
atomic_read(&soft->dmawrite_done))) {
rv = -ERESTARTSYS;
goto dmawrite_exit;
}
rv = len;
*off += len;
dmawrite_exit:
up(&soft->dmawritelock);
return rv;
}
static inline ssize_t
do_mbcs_sram_dmaread(struct mbcs_soft *soft, uint64_t hostAddr,
size_t len, loff_t * off)
{
int rv = 0;
if (down_interruptible(&soft->dmareadlock))
return -ERESTARTSYS;
atomic_set(&soft->dmawrite_done, 0);
soft->getdma.hostAddr = hostAddr;
soft->getdma.localAddr = *off;
soft->getdma.bytes = len;
if (mbcs_getdma_start(soft) < 0) {
DBG(KERN_ALERT "mbcs_strategy: mbcs_getdma_start failed\n");
rv = -EAGAIN;
goto dmaread_exit;
}
if (wait_event_interruptible(soft->dmaread_queue,
atomic_read(&soft->dmaread_done))) {
rv = -ERESTARTSYS;
goto dmaread_exit;
}
rv = len;
*off += len;
dmaread_exit:
up(&soft->dmareadlock);
return rv;
}
int mbcs_open(struct inode *ip, struct file *fp)
{
struct mbcs_soft *soft;
int minor;
minor = iminor(ip);
list_for_each_entry(soft, &soft_list, list) {
if (soft->nasid == minor) {
fp->private_data = soft->cxdev;
return 0;
}
}
return -ENODEV;
}
ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
{
struct cx_dev *cx_dev = fp->private_data;
struct mbcs_soft *soft = cx_dev->soft;
uint64_t hostAddr;
int rv = 0;
hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
if (hostAddr == 0)
return -ENOMEM;
rv = do_mbcs_sram_dmawrite(soft, hostAddr, len, off);
if (rv < 0)
goto exit;
if (copy_to_user(buf, (void *)hostAddr, len))
rv = -EFAULT;
exit:
free_pages(hostAddr, get_order(len));
return rv;
}
ssize_t
mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * off)
{
struct cx_dev *cx_dev = fp->private_data;
struct mbcs_soft *soft = cx_dev->soft;
uint64_t hostAddr;
int rv = 0;
hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
if (hostAddr == 0)
return -ENOMEM;
if (copy_from_user((void *)hostAddr, buf, len)) {
rv = -EFAULT;
goto exit;
}
rv = do_mbcs_sram_dmaread(soft, hostAddr, len, off);
exit:
free_pages(hostAddr, get_order(len));
return rv;
}
loff_t mbcs_sram_llseek(struct file * filp, loff_t off, int whence)
{
loff_t newpos;
switch (whence) {
case SEEK_SET:
newpos = off;
break;
case SEEK_CUR:
newpos = filp->f_pos + off;
break;
case SEEK_END:
newpos = MBCS_SRAM_SIZE + off;
break;
default: /* can't happen */
return -EINVAL;
}
if (newpos < 0)
return -EINVAL;
filp->f_pos = newpos;
return newpos;
}
static uint64_t mbcs_pioaddr(struct mbcs_soft *soft, uint64_t offset)
{
uint64_t mmr_base;
mmr_base = (uint64_t) (soft->mmr_base + offset);
return mmr_base;
}
static void mbcs_debug_pioaddr_set(struct mbcs_soft *soft)
{
soft->debug_addr = mbcs_pioaddr(soft, MBCS_DEBUG_START);
}
static void mbcs_gscr_pioaddr_set(struct mbcs_soft *soft)
{
soft->gscr_addr = mbcs_pioaddr(soft, MBCS_GSCR_START);
}
int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma)
{
struct cx_dev *cx_dev = fp->private_data;
struct mbcs_soft *soft = cx_dev->soft;
if (vma->vm_pgoff != 0)
return -EINVAL;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
if (remap_pfn_range(vma,
vma->vm_start,
__pa(soft->gscr_addr) >> PAGE_SHIFT,
PAGE_SIZE,
vma->vm_page_prot))
return -EAGAIN;
return 0;
}
/**
* mbcs_completion_intr_handler - Primary completion handler.
* @irq: irq
* @arg: soft struct for device
*
*/
static irqreturn_t
mbcs_completion_intr_handler(int irq, void *arg)
{
struct mbcs_soft *soft = (struct mbcs_soft *)arg;
void *mmr_base;
union cm_status cm_status;
union cm_control cm_control;
mmr_base = soft->mmr_base;
cm_status.cm_status_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_STATUS);
if (cm_status.rd_dma_done) {
/* stop dma-read engine, clear status */
cm_control.cm_control_reg =
MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.rd_dma_clr = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
cm_control.cm_control_reg);
atomic_set(&soft->dmaread_done, 1);
wake_up(&soft->dmaread_queue);
}
if (cm_status.wr_dma_done) {
/* stop dma-write engine, clear status */
cm_control.cm_control_reg =
MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.wr_dma_clr = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
cm_control.cm_control_reg);
atomic_set(&soft->dmawrite_done, 1);
wake_up(&soft->dmawrite_queue);
}
if (cm_status.alg_done) {
/* clear status */
cm_control.cm_control_reg =
MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.alg_done_clr = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
cm_control.cm_control_reg);
atomic_set(&soft->algo_done, 1);
wake_up(&soft->algo_queue);
}
return IRQ_HANDLED;
}
/**
* mbcs_intr_alloc - Allocate interrupts.
* @dev: device pointer
*
*/
static int mbcs_intr_alloc(struct cx_dev *dev)
{
struct sn_irq_info *sn_irq;
struct mbcs_soft *soft;
struct getdma *getdma;
struct putdma *putdma;
struct algoblock *algo;
soft = dev->soft;
getdma = &soft->getdma;
putdma = &soft->putdma;
algo = &soft->algo;
soft->get_sn_irq = NULL;
soft->put_sn_irq = NULL;
soft->algo_sn_irq = NULL;
sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
if (sn_irq == NULL)
return -EAGAIN;
soft->get_sn_irq = sn_irq;
getdma->intrHostDest = sn_irq->irq_xtalkaddr;
getdma->intrVector = sn_irq->irq_irq;
if (request_irq(sn_irq->irq_irq,
(void *)mbcs_completion_intr_handler, IRQF_SHARED,
"MBCS get intr", (void *)soft)) {
tiocx_irq_free(soft->get_sn_irq);
return -EAGAIN;
}
sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
if (sn_irq == NULL) {
free_irq(soft->get_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->get_sn_irq);
return -EAGAIN;
}
soft->put_sn_irq = sn_irq;
putdma->intrHostDest = sn_irq->irq_xtalkaddr;
putdma->intrVector = sn_irq->irq_irq;
if (request_irq(sn_irq->irq_irq,
(void *)mbcs_completion_intr_handler, IRQF_SHARED,
"MBCS put intr", (void *)soft)) {
tiocx_irq_free(soft->put_sn_irq);
free_irq(soft->get_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->get_sn_irq);
return -EAGAIN;
}
sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
if (sn_irq == NULL) {
free_irq(soft->put_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->put_sn_irq);
free_irq(soft->get_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->get_sn_irq);
return -EAGAIN;
}
soft->algo_sn_irq = sn_irq;
algo->intrHostDest = sn_irq->irq_xtalkaddr;
algo->intrVector = sn_irq->irq_irq;
if (request_irq(sn_irq->irq_irq,
(void *)mbcs_completion_intr_handler, IRQF_SHARED,
"MBCS algo intr", (void *)soft)) {
tiocx_irq_free(soft->algo_sn_irq);
free_irq(soft->put_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->put_sn_irq);
free_irq(soft->get_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->get_sn_irq);
return -EAGAIN;
}
return 0;
}
/**
* mbcs_intr_dealloc - Remove interrupts.
* @dev: device pointer
*
*/
static void mbcs_intr_dealloc(struct cx_dev *dev)
{
struct mbcs_soft *soft;
soft = dev->soft;
free_irq(soft->get_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->get_sn_irq);
free_irq(soft->put_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->put_sn_irq);
free_irq(soft->algo_sn_irq->irq_irq, soft);
tiocx_irq_free(soft->algo_sn_irq);
}
static inline int mbcs_hw_init(struct mbcs_soft *soft)
{
void *mmr_base = soft->mmr_base;
union cm_control cm_control;
union cm_req_timeout cm_req_timeout;
uint64_t err_stat;
cm_req_timeout.cm_req_timeout_reg =
MBCS_MMR_GET(mmr_base, MBCS_CM_REQ_TOUT);
cm_req_timeout.time_out = MBCS_CM_CONTROL_REQ_TOUT_MASK;
MBCS_MMR_SET(mmr_base, MBCS_CM_REQ_TOUT,
cm_req_timeout.cm_req_timeout_reg);
mbcs_gscr_pioaddr_set(soft);
mbcs_debug_pioaddr_set(soft);
/* clear errors */
err_stat = MBCS_MMR_GET(mmr_base, MBCS_CM_ERR_STAT);
MBCS_MMR_SET(mmr_base, MBCS_CM_CLR_ERR_STAT, err_stat);
MBCS_MMR_ZERO(mmr_base, MBCS_CM_ERROR_DETAIL1);
/* enable interrupts */
/* turn off 2^23 (INT_EN_PIO_REQ_ADDR_INV) */
MBCS_MMR_SET(mmr_base, MBCS_CM_ERR_INT_EN, 0x3ffffff7e00ffUL);
/* arm status regs and clear engines */
cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
cm_control.rearm_stat_regs = 1;
cm_control.alg_clr = 1;
cm_control.wr_dma_clr = 1;
cm_control.rd_dma_clr = 1;
MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
return 0;
}
static ssize_t show_algo(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cx_dev *cx_dev = to_cx_dev(dev);
struct mbcs_soft *soft = cx_dev->soft;
uint64_t debug0;
/*
* By convention, the first debug register contains the
* algorithm number and revision.
*/
debug0 = *(uint64_t *) soft->debug_addr;
return sprintf(buf, "0x%lx 0x%lx\n",
(debug0 >> 32), (debug0 & 0xffffffff));
}
static ssize_t store_algo(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
int n;
struct cx_dev *cx_dev = to_cx_dev(dev);
struct mbcs_soft *soft = cx_dev->soft;
if (count <= 0)
return 0;
n = simple_strtoul(buf, NULL, 0);
if (n == 1) {
mbcs_algo_start(soft);
if (wait_event_interruptible(soft->algo_queue,
atomic_read(&soft->algo_done)))
return -ERESTARTSYS;
}
return count;
}
DEVICE_ATTR(algo, 0644, show_algo, store_algo);
/**
* mbcs_probe - Initialize for device
* @dev: device pointer
* @device_id: id table pointer
*
*/
static int mbcs_probe(struct cx_dev *dev, const struct cx_device_id *id)
{
struct mbcs_soft *soft;
dev->soft = NULL;
soft = kzalloc(sizeof(struct mbcs_soft), GFP_KERNEL);
if (soft == NULL)
return -ENOMEM;
soft->nasid = dev->cx_id.nasid;
list_add(&soft->list, &soft_list);
soft->mmr_base = (void *)tiocx_swin_base(dev->cx_id.nasid);
dev->soft = soft;
soft->cxdev = dev;
init_waitqueue_head(&soft->dmawrite_queue);
init_waitqueue_head(&soft->dmaread_queue);
init_waitqueue_head(&soft->algo_queue);
init_MUTEX(&soft->dmawritelock);
init_MUTEX(&soft->dmareadlock);
init_MUTEX(&soft->algolock);
mbcs_getdma_init(&soft->getdma);
mbcs_putdma_init(&soft->putdma);
mbcs_algo_init(&soft->algo);
mbcs_hw_init(soft);
/* Allocate interrupts */
mbcs_intr_alloc(dev);
device_create_file(&dev->dev, &dev_attr_algo);
return 0;
}
static int mbcs_remove(struct cx_dev *dev)
{
if (dev->soft) {
mbcs_intr_dealloc(dev);
kfree(dev->soft);
}
device_remove_file(&dev->dev, &dev_attr_algo);
return 0;
}
const struct cx_device_id __devinitdata mbcs_id_table[] = {
{
.part_num = MBCS_PART_NUM,
.mfg_num = MBCS_MFG_NUM,
},
{
.part_num = MBCS_PART_NUM_ALG0,
.mfg_num = MBCS_MFG_NUM,
},
{0, 0}
};
MODULE_DEVICE_TABLE(cx, mbcs_id_table);
struct cx_drv mbcs_driver = {
.name = DEVICE_NAME,
.id_table = mbcs_id_table,
.probe = mbcs_probe,
.remove = mbcs_remove,
};
static void __exit mbcs_exit(void)
{
int rv;
rv = unregister_chrdev(mbcs_major, DEVICE_NAME);
if (rv < 0)
DBG(KERN_ALERT "Error in unregister_chrdev: %d\n", rv);
cx_driver_unregister(&mbcs_driver);
}
static int __init mbcs_init(void)
{
int rv;
if (!ia64_platform_is("sn2"))
return -ENODEV;
// Put driver into chrdevs[]. Get major number.
rv = register_chrdev(mbcs_major, DEVICE_NAME, &mbcs_ops);
if (rv < 0) {
DBG(KERN_ALERT "mbcs_init: can't get major number. %d\n", rv);
return rv;
}
mbcs_major = rv;
return cx_driver_register(&mbcs_driver);
}
module_init(mbcs_init);
module_exit(mbcs_exit);
MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
MODULE_DESCRIPTION("Driver for MOATB Core Services");
MODULE_LICENSE("GPL");
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