2006-12-08 07:43:59 +08:00
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|
|
/*
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* OMAP mailbox driver
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*
|
2009-03-24 09:07:24 +08:00
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* Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
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2014-06-25 08:43:41 +08:00
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* Copyright (C) 2013-2014 Texas Instruments Inc.
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2006-12-08 07:43:59 +08:00
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*
|
2009-03-24 09:07:24 +08:00
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* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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2014-06-25 08:43:41 +08:00
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* Suman Anna <s-anna@ti.com>
|
2006-12-08 07:43:59 +08:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/interrupt.h>
|
2010-06-11 23:51:49 +08:00
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#include <linux/spinlock.h>
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|
|
#include <linux/mutex.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 16:04:11 +08:00
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|
|
#include <linux/slab.h>
|
2010-05-05 23:33:09 +08:00
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|
#include <linux/kfifo.h>
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#include <linux/err.h>
|
2010-11-30 04:24:14 +08:00
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#include <linux/notifier.h>
|
2011-08-01 04:14:14 +08:00
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|
#include <linux/module.h>
|
2014-06-25 08:43:41 +08:00
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|
#include <linux/platform_device.h>
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|
|
#include <linux/pm_runtime.h>
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|
|
#include <linux/platform_data/mailbox-omap.h>
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|
|
#include <linux/omap-mailbox.h>
|
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|
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|
|
#define MAILBOX_REVISION 0x000
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|
|
#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
|
|
|
|
#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
|
|
|
|
#define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
|
|
|
|
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|
|
#define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
|
|
|
|
#define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
|
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|
#define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
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#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
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#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
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#define MAILBOX_IRQSTATUS(type, u) (type ? OMAP4_MAILBOX_IRQSTATUS(u) : \
|
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|
|
OMAP2_MAILBOX_IRQSTATUS(u))
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|
|
#define MAILBOX_IRQENABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE(u) : \
|
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|
|
OMAP2_MAILBOX_IRQENABLE(u))
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|
#define MAILBOX_IRQDISABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE_CLR(u) \
|
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|
|
: OMAP2_MAILBOX_IRQENABLE(u))
|
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|
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|
#define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
|
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|
|
#define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
|
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#define MBOX_REG_SIZE 0x120
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#define OMAP4_MBOX_REG_SIZE 0x130
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#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
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#define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
|
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struct omap_mbox_fifo {
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unsigned long msg;
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|
|
unsigned long fifo_stat;
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|
|
unsigned long msg_stat;
|
|
|
|
unsigned long irqenable;
|
|
|
|
unsigned long irqstatus;
|
|
|
|
unsigned long irqdisable;
|
2014-06-25 08:43:42 +08:00
|
|
|
u32 intr_bit;
|
2014-06-25 08:43:41 +08:00
|
|
|
};
|
|
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struct omap_mbox_queue {
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|
|
spinlock_t lock;
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|
|
struct kfifo fifo;
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|
|
struct work_struct work;
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|
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struct tasklet_struct tasklet;
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|
|
struct omap_mbox *mbox;
|
|
|
|
bool full;
|
|
|
|
};
|
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struct omap_mbox {
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|
|
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const char *name;
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|
|
int irq;
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|
|
struct omap_mbox_queue *txq, *rxq;
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|
|
struct device *dev;
|
2014-06-25 08:43:42 +08:00
|
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|
struct omap_mbox_fifo tx_fifo;
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|
struct omap_mbox_fifo rx_fifo;
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|
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u32 ctx[OMAP4_MBOX_NR_REGS];
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|
|
u32 intr_type;
|
2014-06-25 08:43:41 +08:00
|
|
|
int use_count;
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|
|
struct blocking_notifier_head notifier;
|
|
|
|
};
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|
static void __iomem *mbox_base;
|
2010-06-11 23:51:46 +08:00
|
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|
static struct omap_mbox **mboxes;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-02-18 14:48:55 +08:00
|
|
|
static DEFINE_MUTEX(mbox_configured_lock);
|
2009-11-23 02:11:22 +08:00
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
|
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|
|
module_param(mbox_kfifo_size, uint, S_IRUGO);
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|
|
|
MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
|
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
static inline unsigned int mbox_read_reg(size_t ofs)
|
|
|
|
{
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|
return __raw_readl(mbox_base + ofs);
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|
}
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static inline void mbox_write_reg(u32 val, size_t ofs)
|
|
|
|
{
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|
__raw_writel(val, mbox_base + ofs);
|
|
|
|
}
|
|
|
|
|
2009-03-24 09:07:26 +08:00
|
|
|
/* Mailbox FIFO handle functions */
|
2014-06-25 08:43:41 +08:00
|
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|
static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
|
2014-06-25 08:43:41 +08:00
|
|
|
return (mbox_msg_t) mbox_read_reg(fifo->msg);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
|
2014-06-25 08:43:41 +08:00
|
|
|
mbox_write_reg(msg, fifo->msg);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
static int mbox_fifo_empty(struct omap_mbox *mbox)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
|
2014-06-25 08:43:41 +08:00
|
|
|
return (mbox_read_reg(fifo->msg_stat) == 0);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
static int mbox_fifo_full(struct omap_mbox *mbox)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
|
2014-06-25 08:43:41 +08:00
|
|
|
return mbox_read_reg(fifo->fifo_stat);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Mailbox IRQ handle functions */
|
2014-06-25 08:43:41 +08:00
|
|
|
static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
|
|
|
|
&mbox->tx_fifo : &mbox->rx_fifo;
|
|
|
|
u32 bit = fifo->intr_bit;
|
|
|
|
u32 irqstatus = fifo->irqstatus;
|
2014-06-25 08:43:41 +08:00
|
|
|
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox_write_reg(bit, irqstatus);
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
/* Flush posted write for irq status to avoid spurious interrupts */
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox_read_reg(irqstatus);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
|
2009-03-24 09:07:26 +08:00
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
|
|
|
|
&mbox->tx_fifo : &mbox->rx_fifo;
|
|
|
|
u32 bit = fifo->intr_bit;
|
|
|
|
u32 irqenable = fifo->irqenable;
|
|
|
|
u32 irqstatus = fifo->irqstatus;
|
|
|
|
|
|
|
|
u32 enable = mbox_read_reg(irqenable);
|
|
|
|
u32 status = mbox_read_reg(irqstatus);
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
return (int)(enable & status & bit);
|
2009-03-24 09:07:26 +08:00
|
|
|
}
|
|
|
|
|
2006-12-08 07:43:59 +08:00
|
|
|
/*
|
|
|
|
* message sender
|
|
|
|
*/
|
2009-11-23 02:11:20 +08:00
|
|
|
int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2010-05-05 23:33:09 +08:00
|
|
|
struct omap_mbox_queue *mq = mbox->txq;
|
|
|
|
int ret = 0, len;
|
2009-11-23 02:11:24 +08:00
|
|
|
|
2010-11-30 04:24:13 +08:00
|
|
|
spin_lock_bh(&mq->lock);
|
2009-04-23 10:05:20 +08:00
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2014-06-25 08:43:39 +08:00
|
|
|
if (kfifo_is_empty(&mq->fifo) && !mbox_fifo_full(mbox)) {
|
2010-11-30 04:24:13 +08:00
|
|
|
mbox_fifo_write(mbox, msg);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
|
|
|
|
WARN_ON(len != sizeof(msg));
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2009-11-23 02:11:24 +08:00
|
|
|
tasklet_schedule(&mbox->txq->tasklet);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
out:
|
2010-11-30 04:24:13 +08:00
|
|
|
spin_unlock_bh(&mq->lock);
|
2010-05-05 23:33:09 +08:00
|
|
|
return ret;
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_msg_send);
|
|
|
|
|
2013-03-13 06:55:29 +08:00
|
|
|
void omap_mbox_save_ctx(struct omap_mbox *mbox)
|
|
|
|
{
|
2014-06-25 08:43:41 +08:00
|
|
|
int i;
|
|
|
|
int nr_regs;
|
|
|
|
|
2014-06-25 08:43:42 +08:00
|
|
|
if (mbox->intr_type)
|
2014-06-25 08:43:41 +08:00
|
|
|
nr_regs = OMAP4_MBOX_NR_REGS;
|
|
|
|
else
|
|
|
|
nr_regs = MBOX_NR_REGS;
|
|
|
|
for (i = 0; i < nr_regs; i++) {
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox->ctx[i] = mbox_read_reg(i * sizeof(u32));
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
|
2014-06-25 08:43:42 +08:00
|
|
|
i, mbox->ctx[i]);
|
2013-03-13 06:55:29 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_save_ctx);
|
|
|
|
|
|
|
|
void omap_mbox_restore_ctx(struct omap_mbox *mbox)
|
|
|
|
{
|
2014-06-25 08:43:41 +08:00
|
|
|
int i;
|
|
|
|
int nr_regs;
|
|
|
|
|
2014-06-25 08:43:42 +08:00
|
|
|
if (mbox->intr_type)
|
2014-06-25 08:43:41 +08:00
|
|
|
nr_regs = OMAP4_MBOX_NR_REGS;
|
|
|
|
else
|
|
|
|
nr_regs = MBOX_NR_REGS;
|
|
|
|
for (i = 0; i < nr_regs; i++) {
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox_write_reg(mbox->ctx[i], i * sizeof(u32));
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
|
2014-06-25 08:43:42 +08:00
|
|
|
i, mbox->ctx[i]);
|
2013-03-13 06:55:29 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_restore_ctx);
|
|
|
|
|
|
|
|
void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
|
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
u32 l;
|
|
|
|
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
|
|
|
|
&mbox->tx_fifo : &mbox->rx_fifo;
|
|
|
|
u32 bit = fifo->intr_bit;
|
|
|
|
u32 irqenable = fifo->irqenable;
|
2014-06-25 08:43:41 +08:00
|
|
|
|
2014-06-25 08:43:42 +08:00
|
|
|
l = mbox_read_reg(irqenable);
|
2014-06-25 08:43:41 +08:00
|
|
|
l |= bit;
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox_write_reg(l, irqenable);
|
2013-03-13 06:55:29 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_enable_irq);
|
|
|
|
|
|
|
|
void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
|
|
|
|
{
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
|
|
|
|
&mbox->tx_fifo : &mbox->rx_fifo;
|
|
|
|
u32 bit = fifo->intr_bit;
|
|
|
|
u32 irqdisable = fifo->irqdisable;
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Read and update the interrupt configuration register for pre-OMAP4.
|
|
|
|
* OMAP4 and later SoCs have a dedicated interrupt disabling register.
|
|
|
|
*/
|
2014-06-25 08:43:42 +08:00
|
|
|
if (!mbox->intr_type)
|
|
|
|
bit = mbox_read_reg(irqdisable) & ~bit;
|
2014-06-25 08:43:41 +08:00
|
|
|
|
2014-06-25 08:43:42 +08:00
|
|
|
mbox_write_reg(bit, irqdisable);
|
2013-03-13 06:55:29 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_disable_irq);
|
|
|
|
|
2009-11-23 02:11:24 +08:00
|
|
|
static void mbox_tx_tasklet(unsigned long tx_data)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2009-11-23 02:11:24 +08:00
|
|
|
struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
|
2010-05-05 23:33:09 +08:00
|
|
|
struct omap_mbox_queue *mq = mbox->txq;
|
|
|
|
mbox_msg_t msg;
|
|
|
|
int ret;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
while (kfifo_len(&mq->fifo)) {
|
2014-06-25 08:43:39 +08:00
|
|
|
if (mbox_fifo_full(mbox)) {
|
2009-11-23 02:11:22 +08:00
|
|
|
omap_mbox_enable_irq(mbox, IRQ_TX);
|
2010-05-05 23:33:09 +08:00
|
|
|
break;
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
2010-05-05 23:33:09 +08:00
|
|
|
|
|
|
|
ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
|
|
|
|
sizeof(msg));
|
|
|
|
WARN_ON(ret != sizeof(msg));
|
|
|
|
|
|
|
|
mbox_fifo_write(mbox, msg);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Message receiver(workqueue)
|
|
|
|
*/
|
|
|
|
static void mbox_rx_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct omap_mbox_queue *mq =
|
|
|
|
container_of(work, struct omap_mbox_queue, work);
|
|
|
|
mbox_msg_t msg;
|
2010-05-05 23:33:09 +08:00
|
|
|
int len;
|
|
|
|
|
|
|
|
while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
|
|
|
|
len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
|
|
|
|
WARN_ON(len != sizeof(msg));
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
blocking_notifier_call_chain(&mq->mbox->notifier, len,
|
|
|
|
(void *)msg);
|
2010-11-30 04:24:11 +08:00
|
|
|
spin_lock_irq(&mq->lock);
|
|
|
|
if (mq->full) {
|
|
|
|
mq->full = false;
|
|
|
|
omap_mbox_enable_irq(mq->mbox, IRQ_RX);
|
|
|
|
}
|
|
|
|
spin_unlock_irq(&mq->lock);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Mailbox interrupt handler
|
|
|
|
*/
|
|
|
|
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
|
|
|
|
{
|
2009-11-23 02:11:22 +08:00
|
|
|
omap_mbox_disable_irq(mbox, IRQ_TX);
|
2006-12-08 07:43:59 +08:00
|
|
|
ack_mbox_irq(mbox, IRQ_TX);
|
2009-11-23 02:11:24 +08:00
|
|
|
tasklet_schedule(&mbox->txq->tasklet);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __mbox_rx_interrupt(struct omap_mbox *mbox)
|
|
|
|
{
|
2010-05-05 23:33:09 +08:00
|
|
|
struct omap_mbox_queue *mq = mbox->rxq;
|
2006-12-08 07:43:59 +08:00
|
|
|
mbox_msg_t msg;
|
2010-05-05 23:33:09 +08:00
|
|
|
int len;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
|
|
|
while (!mbox_fifo_empty(mbox)) {
|
2010-05-05 23:33:09 +08:00
|
|
|
if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
|
2010-02-09 03:35:40 +08:00
|
|
|
omap_mbox_disable_irq(mbox, IRQ_RX);
|
2010-11-30 04:24:11 +08:00
|
|
|
mq->full = true;
|
2006-12-08 07:43:59 +08:00
|
|
|
goto nomem;
|
2010-02-09 03:35:40 +08:00
|
|
|
}
|
2006-12-08 07:43:59 +08:00
|
|
|
|
|
|
|
msg = mbox_fifo_read(mbox);
|
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
|
|
|
|
WARN_ON(len != sizeof(msg));
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* no more messages in the fifo. clear IRQ source. */
|
|
|
|
ack_mbox_irq(mbox, IRQ_RX);
|
2009-03-24 09:07:24 +08:00
|
|
|
nomem:
|
2011-01-26 19:12:50 +08:00
|
|
|
schedule_work(&mbox->rxq->work);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t mbox_interrupt(int irq, void *p)
|
|
|
|
{
|
2007-10-26 17:40:22 +08:00
|
|
|
struct omap_mbox *mbox = p;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
|
|
|
if (is_mbox_irq(mbox, IRQ_TX))
|
|
|
|
__mbox_tx_interrupt(mbox);
|
|
|
|
|
|
|
|
if (is_mbox_irq(mbox, IRQ_RX))
|
|
|
|
__mbox_rx_interrupt(mbox);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
|
2009-11-23 02:11:24 +08:00
|
|
|
void (*work) (struct work_struct *),
|
|
|
|
void (*tasklet)(unsigned long))
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
|
|
|
struct omap_mbox_queue *mq;
|
|
|
|
|
|
|
|
mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
|
|
|
|
if (!mq)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
spin_lock_init(&mq->lock);
|
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
|
2006-12-08 07:43:59 +08:00
|
|
|
goto error;
|
|
|
|
|
2009-11-23 02:11:24 +08:00
|
|
|
if (work)
|
|
|
|
INIT_WORK(&mq->work, work);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2009-11-23 02:11:24 +08:00
|
|
|
if (tasklet)
|
|
|
|
tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
|
2006-12-08 07:43:59 +08:00
|
|
|
return mq;
|
|
|
|
error:
|
|
|
|
kfree(mq);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mbox_queue_free(struct omap_mbox_queue *q)
|
|
|
|
{
|
2010-05-05 23:33:09 +08:00
|
|
|
kfifo_free(&q->fifo);
|
2006-12-08 07:43:59 +08:00
|
|
|
kfree(q);
|
|
|
|
}
|
|
|
|
|
2009-11-23 02:11:19 +08:00
|
|
|
static int omap_mbox_startup(struct omap_mbox *mbox)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2009-11-23 02:11:22 +08:00
|
|
|
int ret = 0;
|
2006-12-08 07:43:59 +08:00
|
|
|
struct omap_mbox_queue *mq;
|
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
mutex_lock(&mbox_configured_lock);
|
2014-06-25 08:43:41 +08:00
|
|
|
ret = pm_runtime_get_sync(mbox->dev->parent);
|
|
|
|
if (unlikely(ret < 0))
|
|
|
|
goto fail_startup;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
if (!mbox->use_count++) {
|
|
|
|
mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
|
|
|
|
if (!mq) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto fail_alloc_txq;
|
|
|
|
}
|
|
|
|
mbox->txq = mq;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
|
|
|
|
if (!mq) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto fail_alloc_rxq;
|
|
|
|
}
|
|
|
|
mbox->rxq = mq;
|
|
|
|
mq->mbox = mbox;
|
2013-02-02 10:37:06 +08:00
|
|
|
ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
|
|
|
|
mbox->name, mbox);
|
|
|
|
if (unlikely(ret)) {
|
|
|
|
pr_err("failed to register mailbox interrupt:%d\n",
|
|
|
|
ret);
|
|
|
|
goto fail_request_irq;
|
|
|
|
}
|
2012-05-13 20:33:04 +08:00
|
|
|
|
|
|
|
omap_mbox_enable_irq(mbox, IRQ_RX);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
2010-11-30 04:24:14 +08:00
|
|
|
mutex_unlock(&mbox_configured_lock);
|
2006-12-08 07:43:59 +08:00
|
|
|
return 0;
|
|
|
|
|
2013-02-02 10:37:06 +08:00
|
|
|
fail_request_irq:
|
|
|
|
mbox_queue_free(mbox->rxq);
|
2010-11-30 04:24:12 +08:00
|
|
|
fail_alloc_rxq:
|
2006-12-08 07:43:59 +08:00
|
|
|
mbox_queue_free(mbox->txq);
|
2010-11-30 04:24:12 +08:00
|
|
|
fail_alloc_txq:
|
2014-06-25 08:43:41 +08:00
|
|
|
pm_runtime_put_sync(mbox->dev->parent);
|
2010-11-30 04:24:14 +08:00
|
|
|
mbox->use_count--;
|
|
|
|
fail_startup:
|
|
|
|
mutex_unlock(&mbox_configured_lock);
|
2006-12-08 07:43:59 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void omap_mbox_fini(struct omap_mbox *mbox)
|
|
|
|
{
|
2010-11-30 04:24:14 +08:00
|
|
|
mutex_lock(&mbox_configured_lock);
|
|
|
|
|
|
|
|
if (!--mbox->use_count) {
|
2012-05-13 20:33:04 +08:00
|
|
|
omap_mbox_disable_irq(mbox, IRQ_RX);
|
2010-11-30 04:24:14 +08:00
|
|
|
free_irq(mbox->irq, mbox);
|
|
|
|
tasklet_kill(&mbox->txq->tasklet);
|
2012-08-21 05:51:24 +08:00
|
|
|
flush_work(&mbox->rxq->work);
|
2010-11-30 04:24:14 +08:00
|
|
|
mbox_queue_free(mbox->txq);
|
|
|
|
mbox_queue_free(mbox->rxq);
|
|
|
|
}
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
pm_runtime_put_sync(mbox->dev->parent);
|
2010-11-30 04:24:14 +08:00
|
|
|
|
|
|
|
mutex_unlock(&mbox_configured_lock);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
struct omap_mbox *omap_mbox_get(const char *name, struct notifier_block *nb)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2011-02-12 03:56:43 +08:00
|
|
|
struct omap_mbox *_mbox, *mbox = NULL;
|
|
|
|
int i, ret;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-06-11 23:51:46 +08:00
|
|
|
if (!mboxes)
|
|
|
|
return ERR_PTR(-EINVAL);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2011-02-12 03:56:43 +08:00
|
|
|
for (i = 0; (_mbox = mboxes[i]); i++) {
|
|
|
|
if (!strcmp(_mbox->name, name)) {
|
|
|
|
mbox = _mbox;
|
2010-06-11 23:51:46 +08:00
|
|
|
break;
|
2011-02-12 03:56:43 +08:00
|
|
|
}
|
|
|
|
}
|
2010-06-11 23:51:46 +08:00
|
|
|
|
|
|
|
if (!mbox)
|
|
|
|
return ERR_PTR(-ENOENT);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
if (nb)
|
|
|
|
blocking_notifier_chain_register(&mbox->notifier, nb);
|
|
|
|
|
2012-05-13 20:33:04 +08:00
|
|
|
ret = omap_mbox_startup(mbox);
|
|
|
|
if (ret) {
|
|
|
|
blocking_notifier_chain_unregister(&mbox->notifier, nb);
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
}
|
|
|
|
|
2006-12-08 07:43:59 +08:00
|
|
|
return mbox;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_get);
|
|
|
|
|
2010-11-30 04:24:14 +08:00
|
|
|
void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2010-11-30 04:24:14 +08:00
|
|
|
blocking_notifier_chain_unregister(&mbox->notifier, nb);
|
2006-12-08 07:43:59 +08:00
|
|
|
omap_mbox_fini(mbox);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(omap_mbox_put);
|
|
|
|
|
2010-05-18 21:15:32 +08:00
|
|
|
static struct class omap_mbox_class = { .name = "mbox", };
|
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
static int omap_mbox_register(struct device *parent, struct omap_mbox **list)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2010-06-11 23:51:46 +08:00
|
|
|
int ret;
|
|
|
|
int i;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-06-11 23:51:46 +08:00
|
|
|
mboxes = list;
|
|
|
|
if (!mboxes)
|
2006-12-08 07:43:59 +08:00
|
|
|
return -EINVAL;
|
|
|
|
|
2010-06-11 23:51:46 +08:00
|
|
|
for (i = 0; mboxes[i]; i++) {
|
|
|
|
struct omap_mbox *mbox = mboxes[i];
|
|
|
|
mbox->dev = device_create(&omap_mbox_class,
|
|
|
|
parent, 0, mbox, "%s", mbox->name);
|
|
|
|
if (IS_ERR(mbox->dev)) {
|
|
|
|
ret = PTR_ERR(mbox->dev);
|
|
|
|
goto err_out;
|
|
|
|
}
|
2010-11-30 04:24:14 +08:00
|
|
|
|
|
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&mbox->notifier);
|
2010-06-11 23:51:46 +08:00
|
|
|
}
|
2009-03-24 09:07:24 +08:00
|
|
|
return 0;
|
|
|
|
|
2010-06-11 23:51:46 +08:00
|
|
|
err_out:
|
|
|
|
while (i--)
|
|
|
|
device_unregister(mboxes[i]->dev);
|
2006-12-08 07:43:59 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
static int omap_mbox_unregister(void)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2010-06-11 23:51:46 +08:00
|
|
|
int i;
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2010-06-11 23:51:46 +08:00
|
|
|
if (!mboxes)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
for (i = 0; mboxes[i]; i++)
|
|
|
|
device_unregister(mboxes[i]->dev);
|
|
|
|
mboxes = NULL;
|
|
|
|
return 0;
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
2014-06-25 08:43:41 +08:00
|
|
|
|
|
|
|
static int omap_mbox_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct resource *mem;
|
|
|
|
int ret;
|
|
|
|
struct omap_mbox **list, *mbox, *mboxblk;
|
|
|
|
struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
|
|
|
|
struct omap_mbox_dev_info *info;
|
2014-06-25 08:43:42 +08:00
|
|
|
struct omap_mbox_fifo *fifo;
|
2014-06-25 08:43:41 +08:00
|
|
|
u32 intr_type;
|
|
|
|
u32 l;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!pdata || !pdata->info_cnt || !pdata->info) {
|
|
|
|
pr_err("%s: platform not supported\n", __func__);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allocate one extra for marking end of list */
|
|
|
|
list = devm_kzalloc(&pdev->dev, (pdata->info_cnt + 1) * sizeof(*list),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!list)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
mboxblk = devm_kzalloc(&pdev->dev, pdata->info_cnt * sizeof(*mbox),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!mboxblk)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
info = pdata->info;
|
|
|
|
intr_type = pdata->intr_type;
|
|
|
|
mbox = mboxblk;
|
2014-06-25 08:43:42 +08:00
|
|
|
for (i = 0; i < pdata->info_cnt; i++, info++) {
|
|
|
|
fifo = &mbox->tx_fifo;
|
|
|
|
fifo->msg = MAILBOX_MESSAGE(info->tx_id);
|
|
|
|
fifo->fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
|
|
|
|
fifo->intr_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
|
|
|
|
fifo->irqenable = MAILBOX_IRQENABLE(intr_type, info->usr_id);
|
|
|
|
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, info->usr_id);
|
|
|
|
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, info->usr_id);
|
|
|
|
|
|
|
|
fifo = &mbox->rx_fifo;
|
|
|
|
fifo->msg = MAILBOX_MESSAGE(info->rx_id);
|
|
|
|
fifo->msg_stat = MAILBOX_MSGSTATUS(info->rx_id);
|
|
|
|
fifo->intr_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
|
|
|
|
fifo->irqenable = MAILBOX_IRQENABLE(intr_type, info->usr_id);
|
|
|
|
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, info->usr_id);
|
|
|
|
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, info->usr_id);
|
|
|
|
|
|
|
|
mbox->intr_type = intr_type;
|
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
mbox->name = info->name;
|
|
|
|
mbox->irq = platform_get_irq(pdev, info->irq_id);
|
|
|
|
if (mbox->irq < 0)
|
|
|
|
return mbox->irq;
|
|
|
|
list[i] = mbox++;
|
|
|
|
}
|
|
|
|
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
mbox_base = devm_ioremap_resource(&pdev->dev, mem);
|
|
|
|
if (IS_ERR(mbox_base))
|
|
|
|
return PTR_ERR(mbox_base);
|
|
|
|
|
|
|
|
ret = omap_mbox_register(&pdev->dev, list);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, list);
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
|
|
|
|
ret = pm_runtime_get_sync(&pdev->dev);
|
|
|
|
if (ret < 0) {
|
|
|
|
pm_runtime_put_noidle(&pdev->dev);
|
|
|
|
goto unregister;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* just print the raw revision register, the format is not
|
|
|
|
* uniform across all SoCs
|
|
|
|
*/
|
|
|
|
l = mbox_read_reg(MAILBOX_REVISION);
|
|
|
|
dev_info(&pdev->dev, "omap mailbox rev 0x%x\n", l);
|
|
|
|
|
|
|
|
ret = pm_runtime_put_sync(&pdev->dev);
|
|
|
|
if (ret < 0)
|
|
|
|
goto unregister;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
unregister:
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
omap_mbox_unregister();
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int omap_mbox_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
omap_mbox_unregister();
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver omap_mbox_driver = {
|
|
|
|
.probe = omap_mbox_probe,
|
|
|
|
.remove = omap_mbox_remove,
|
|
|
|
.driver = {
|
|
|
|
.name = "omap-mailbox",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
};
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2009-11-23 02:11:19 +08:00
|
|
|
static int __init omap_mbox_init(void)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2010-05-18 21:15:32 +08:00
|
|
|
int err;
|
|
|
|
|
|
|
|
err = class_register(&omap_mbox_class);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2010-05-05 23:33:09 +08:00
|
|
|
/* kfifo size sanity check: alignment and minimal size */
|
|
|
|
mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
|
2010-11-30 04:24:12 +08:00
|
|
|
mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
|
|
|
|
sizeof(mbox_msg_t));
|
2010-05-05 23:33:09 +08:00
|
|
|
|
2014-06-25 08:43:41 +08:00
|
|
|
return platform_driver_register(&omap_mbox_driver);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
2010-05-18 21:15:32 +08:00
|
|
|
subsys_initcall(omap_mbox_init);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2009-11-23 02:11:19 +08:00
|
|
|
static void __exit omap_mbox_exit(void)
|
2006-12-08 07:43:59 +08:00
|
|
|
{
|
2014-06-25 08:43:41 +08:00
|
|
|
platform_driver_unregister(&omap_mbox_driver);
|
2010-05-18 21:15:32 +08:00
|
|
|
class_unregister(&omap_mbox_class);
|
2006-12-08 07:43:59 +08:00
|
|
|
}
|
2009-11-23 02:11:19 +08:00
|
|
|
module_exit(omap_mbox_exit);
|
2006-12-08 07:43:59 +08:00
|
|
|
|
2009-03-24 09:07:24 +08:00
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
|
2010-05-05 23:33:07 +08:00
|
|
|
MODULE_AUTHOR("Toshihiro Kobayashi");
|
|
|
|
MODULE_AUTHOR("Hiroshi DOYU");
|