forked from luck/tmp_suning_uos_patched
0435b13ee3
If a call to device_create() fails for a channel during the initialize loop, we need to clean the devices entries already created before leaving. Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com> Cc: linux-mips@linux-mips.org Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Cc: John Crispin <blogic@openwrt.org> Cc: Qais Yousef <Qais.Yousef@imgtec.com> Cc: linux-kernel@vger.kernel.org Cc: Jerome Oufella <jerome.oufella@savoirfairelinux.com> Patchwork: https://patchwork.linux-mips.org/patch/7111/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
154 lines
3.2 KiB
C
154 lines
3.2 KiB
C
/*
|
|
* 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 MIPS Technologies, Inc. All rights reserved.
|
|
* Copyright (C) 2013 Imagination Technologies Ltd.
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/mips_mt.h>
|
|
#include <asm/vpe.h>
|
|
#include <asm/rtlx.h>
|
|
|
|
static int major;
|
|
|
|
static void rtlx_dispatch(void)
|
|
{
|
|
if (read_c0_cause() & read_c0_status() & C_SW0)
|
|
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
|
|
}
|
|
|
|
/*
|
|
* Interrupt handler may be called before rtlx_init has otherwise had
|
|
* a chance to run.
|
|
*/
|
|
static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
|
|
{
|
|
unsigned int vpeflags;
|
|
unsigned long flags;
|
|
int i;
|
|
|
|
local_irq_save(flags);
|
|
vpeflags = dvpe();
|
|
set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
|
|
irq_enable_hazard();
|
|
evpe(vpeflags);
|
|
local_irq_restore(flags);
|
|
|
|
for (i = 0; i < RTLX_CHANNELS; i++) {
|
|
wake_up(&channel_wqs[i].lx_queue);
|
|
wake_up(&channel_wqs[i].rt_queue);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction rtlx_irq = {
|
|
.handler = rtlx_interrupt,
|
|
.name = "RTLX",
|
|
};
|
|
|
|
static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
|
|
|
|
void _interrupt_sp(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
dvpe();
|
|
settc(1);
|
|
write_vpe_c0_cause(read_vpe_c0_cause() | C_SW0);
|
|
evpe(EVPE_ENABLE);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
int __init rtlx_module_init(void)
|
|
{
|
|
struct device *dev;
|
|
int i, err;
|
|
|
|
if (!cpu_has_mipsmt) {
|
|
pr_warn("VPE loader: not a MIPS MT capable processor\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (aprp_cpu_index() == 0) {
|
|
pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
|
|
"Pass maxtcs=<n> argument as kernel argument\n");
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops);
|
|
if (major < 0) {
|
|
pr_err("rtlx_module_init: unable to register device\n");
|
|
return major;
|
|
}
|
|
|
|
/* initialise the wait queues */
|
|
for (i = 0; i < RTLX_CHANNELS; i++) {
|
|
init_waitqueue_head(&channel_wqs[i].rt_queue);
|
|
init_waitqueue_head(&channel_wqs[i].lx_queue);
|
|
atomic_set(&channel_wqs[i].in_open, 0);
|
|
mutex_init(&channel_wqs[i].mutex);
|
|
|
|
dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
|
|
"%s%d", RTLX_MODULE_NAME, i);
|
|
if (IS_ERR(dev)) {
|
|
while (i--)
|
|
device_destroy(mt_class, MKDEV(major, i));
|
|
|
|
err = PTR_ERR(dev);
|
|
goto out_chrdev;
|
|
}
|
|
}
|
|
|
|
/* set up notifiers */
|
|
rtlx_notify.start = rtlx_starting;
|
|
rtlx_notify.stop = rtlx_stopping;
|
|
vpe_notify(aprp_cpu_index(), &rtlx_notify);
|
|
|
|
if (cpu_has_vint) {
|
|
aprp_hook = rtlx_dispatch;
|
|
} else {
|
|
pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
|
|
err = -ENODEV;
|
|
goto out_class;
|
|
}
|
|
|
|
rtlx_irq.dev_id = rtlx;
|
|
err = setup_irq(rtlx_irq_num, &rtlx_irq);
|
|
if (err)
|
|
goto out_class;
|
|
|
|
return 0;
|
|
|
|
out_class:
|
|
for (i = 0; i < RTLX_CHANNELS; i++)
|
|
device_destroy(mt_class, MKDEV(major, i));
|
|
out_chrdev:
|
|
unregister_chrdev(major, RTLX_MODULE_NAME);
|
|
|
|
return err;
|
|
}
|
|
|
|
void __exit rtlx_module_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < RTLX_CHANNELS; i++)
|
|
device_destroy(mt_class, MKDEV(major, i));
|
|
|
|
unregister_chrdev(major, RTLX_MODULE_NAME);
|
|
|
|
aprp_hook = NULL;
|
|
}
|