MIPS: APRP: Add RTLX API support for CMP platforms.

This patch adds RTLX API support for platforms having a CMP.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Reviewed-by: Qais Yousef <Qais.Yousef@imgtec.com>
Patchwork: http://patchwork.linux-mips.org/patch/6095/
Reviewed-by: John Crispin <blogic@openwrt.org>
This commit is contained in:
Deng-Cheng Zhu 2014-01-01 16:29:03 +01:00 committed by Ralf Baechle
parent 2c973ef0cc
commit da615cf603
4 changed files with 123 additions and 0 deletions

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@ -1956,6 +1956,11 @@ config MIPS_VPE_APSP_API
depends on MIPS_VPE_LOADER
help
config MIPS_VPE_APSP_API_CMP
bool
default "y"
depends on MIPS_VPE_APSP_API && MIPS_CMP
config MIPS_VPE_APSP_API_MT
bool
default "y"

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@ -78,6 +78,7 @@ struct rtlx_channel {
extern struct rtlx_info {
unsigned long id;
enum rtlx_state state;
int ap_int_pending; /* Status of 0 or 1 for CONFIG_MIPS_CMP only */
struct rtlx_channel channel[RTLX_CHANNELS];
} *rtlx;

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@ -59,6 +59,7 @@ obj-$(CONFIG_MIPS_VPE_LOADER) += vpe.o
obj-$(CONFIG_MIPS_VPE_LOADER_CMP) += vpe-cmp.o
obj-$(CONFIG_MIPS_VPE_LOADER_MT) += vpe-mt.o
obj-$(CONFIG_MIPS_VPE_APSP_API) += rtlx.o
obj-$(CONFIG_MIPS_VPE_APSP_API_CMP) += rtlx-cmp.o
obj-$(CONFIG_MIPS_VPE_APSP_API_MT) += rtlx-mt.o
obj-$(CONFIG_I8259) += i8259.o

116
arch/mips/kernel/rtlx-cmp.c Normal file
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@ -0,0 +1,116 @@
/*
* 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/smp.h>
#include <asm/mips_mt.h>
#include <asm/vpe.h>
#include <asm/rtlx.h>
static int major;
static void rtlx_interrupt(void)
{
int i;
struct rtlx_info *info;
struct rtlx_info **p = vpe_get_shared(aprp_cpu_index());
if (p == NULL || *p == NULL)
return;
info = *p;
if (info->ap_int_pending == 1 && smp_processor_id() == 0) {
for (i = 0; i < RTLX_CHANNELS; i++) {
wake_up(&channel_wqs[i].lx_queue);
wake_up(&channel_wqs[i].rt_queue);
}
info->ap_int_pending = 0;
}
}
void _interrupt_sp(void)
{
smp_send_reschedule(aprp_cpu_index());
}
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 (num_possible_cpus() - aprp_cpu_index() < 1) {
pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
"Pass maxcpus=<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)) {
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_interrupt;
} else {
pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
err = -ENODEV;
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);
}