RE: [PATCH 0/3] UCC TDM driver for MPC83xx platforms
Hello All
The TDM driver just now does not have a proper framework. Probably the
interface cannot be generalised as such. Hence we could not decide
whether it would be right to think of a TDM framework. Infact the
interface this TDM driver(for MPC8323ERDB) supplies may not be usable
for some other client as such. Please suggest on this.
But you are right as far as Freescale PowerPC platforms are concerned
which have TDM devices. Like, 8315 also has a TDM driver which also
exposes similar interface as 8323 because the client it is talking to is
the same.
Following is the small description of the TDM driver along with
interface details:
The dts file keeps a track of the TDM devices present on the board.
Depending on them the TDM driver initializes those many driver instances
while coming up.
The driver on the upper level can plug to more than one tdm clients
depending on the availablity of TDM devices. At every new request of
the TDM client to bind with a TDM device, a free driver instance is
allocated to the client.
The interface can be described as follows.
tdm_register_client(struct tdm_client *)
This API returns a pointer to the structure tdm_client which is
of type
struct tdm_client {
u32 driver_handle;
u32 (*tdm_read)(u32 driver_handle, short chn_id, short
*pcm_buffer, short len);
u32 (*tdm_write)(u32 driver_handle, short chn_id, short
*pcm_buffer, short len);
wait_queue_head_t *wakeup_event;
}
It consists of:
- driver_handle: It is basically to identify the particular TDM
device/driver instance.
- tdm_read: It is a function pointer returned by the TDM driver to be
used to read TDM data form a particular TDM channel.
- tdm_write: It is a function pointer returned by the TDM driver to
be used to write TDM data to a particular TDM channel.
- wakeup_event: It is address of a wait_queue event on which the
client keeps on sleeping, and the TDM driver wakes it up periodically.
The driver is configured to wake up the client after every 10ms.
Once the TDM client gets registered to a TDM driver instance and a TDM
device, it interfaces with the driver using tdm_read, tdm_write and
wakeup_event.
Note: The TDM driver can be used by only kernel level modules. The
driver does not expose any file interface for User Applications. Can be
compared to the spi driver which interfaces with the SPI clients
through some APIs.
I need your feedback on the interface details. Some changes were
suggested by Andrew for 32 bit tdm handle which I will modify.(Thanks
Andrew)
Please give your ideas about a TDM framework in the kernel and the
interface.
Waiting for your feedback.
Thanks and Regards
Poonam
-Original Message-
From: Kumar Gala [mailto:[EMAIL PROTECTED]
Sent: Tuesday, January 15, 2008 9:01 AM
To: Andrew Morton
Cc: Phillips Kim; Aggrwal Poonam; [EMAIL PROTECTED];
[EMAIL PROTECTED]; [EMAIL PROTECTED];
[EMAIL PROTECTED]; [EMAIL PROTECTED]; Barkowski Michael;
Kalra Ashish; Cutler Richard
Subject: Re: [PATCH 0/3] UCC TDM driver for MPC83xx platforms
On Jan 14, 2008, at 3:15 PM, Andrew Morton wrote:
On Mon, 14 Jan 2008 12:00:51 -0600
Kim Phillips [EMAIL PROTECTED] wrote:
On Thu, 10 Jan 2008 21:41:20 -0700
Aggrwal Poonam [EMAIL PROTECTED] wrote:
Hello All
I am waiting for more feedback on the patches.
If there are no objections please consider them for 2.6.25.
if this isn't going to go through Alessandro Rubini/misc drivers, can
it go through the akpm/mm tree?
That would work. But it might be more appropriate to go Kumar-
paulus-Linus.
I'm ok w/taking the arch/powerpc bits, but Im a bit concerned about
the driver itself. I'm wondering if we need a TDM framework in the
kernel.
I guess if Poonam could possibly describe how this driver is actually
used that would be helpful. I see we have 8315 with a discrete TDM
block and I'm guessing 82xx/85xx based CPM parts of some form of TDM
as well.
- k
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RE: [PATCH 0/3] UCC TDM driver for MPC83xx platforms
On Fri, 2008-01-18 at 17:28 +0530, Aggrwal Poonam wrote:
Hello All
The TDM driver just now does not have a proper framework. Probably the
interface cannot be generalised as such. Hence we could not decide
whether it would be right to think of a TDM framework. Infact the
interface this TDM driver(for MPC8323ERDB) supplies may not be usable
for some other client as such. Please suggest on this.
But you are right as far as Freescale PowerPC platforms are concerned
which have TDM devices. Like, 8315 also has a TDM driver which also
exposes similar interface as 8323 because the client it is talking to is
the same.
Following is the small description of the TDM driver along with
interface details:
The dts file keeps a track of the TDM devices present on the board.
Depending on them the TDM driver initializes those many driver instances
while coming up.
The driver on the upper level can plug to more than one tdm clients
depending on the availablity of TDM devices. At every new request of
the TDM client to bind with a TDM device, a free driver instance is
allocated to the client.
The interface can be described as follows.
tdm_register_client(struct tdm_client *)
This API returns a pointer to the structure tdm_client which is
of type
struct tdm_client {
u32 driver_handle;
u32 (*tdm_read)(u32 driver_handle, short chn_id, short
*pcm_buffer, short len);
u32 (*tdm_write)(u32 driver_handle, short chn_id, short
*pcm_buffer, short len);
wait_queue_head_t *wakeup_event;
}
It consists of:
- driver_handle: It is basically to identify the particular TDM
device/driver instance.
- tdm_read: It is a function pointer returned by the TDM driver to be
used to read TDM data form a particular TDM channel.
- tdm_write: It is a function pointer returned by the TDM driver to
be used to write TDM data to a particular TDM channel.
- wakeup_event: It is address of a wait_queue event on which the
client keeps on sleeping, and the TDM driver wakes it up periodically.
The driver is configured to wake up the client after every 10ms.
Once the TDM client gets registered to a TDM driver instance and a TDM
device, it interfaces with the driver using tdm_read, tdm_write and
wakeup_event.
Note: The TDM driver can be used by only kernel level modules. The
driver does not expose any file interface for User Applications. Can be
compared to the spi driver which interfaces with the SPI clients
through some APIs.
I need your feedback on the interface details. Some changes were
suggested by Andrew for 32 bit tdm handle which I will modify.(Thanks
Andrew)
Please give your ideas about a TDM framework in the kernel and the
interface.
Waiting for your feedback.
Thanks and Regards
Poonam
Hi Poonam
I may have to write a HDLC over QMC driver for 832x in the near future.
Although I haven't looked at much at the UCCs programming i/f I noticed
that QMC is supposed to run over TDM. Is your TDM driver suitable for
hooking up such a driver on top?
Jocke
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RE: [PATCH 0/3] UCC TDM driver for MPC83xx platforms
Hello All I am waiting for more feedback on the patches. If there are no objections please consider them for 2.6.25. With Regards Poonam -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aggrwal Poonam Sent: Monday, December 10, 2007 5:23 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; Gala Kumar Cc: Barkowski Michael; Phillips Kim; Kalra Ashish; Cutler Richard Subject: [PATCH 0/3] UCC TDM driver for MPC83xx platforms There are three patches [PATCH 1/3] drivers/misc : UCC TDM driver for mpc83xx platforms. This driver is usable in VoIP iind of applications to interface with SLIC kind of devices to exchange TDM voice samples. [PATCH 2/3] arch/ : Platform changes - device tree entries for UCC TDM driver for MPC8323ERDB platform. - QE changes related to TDM , like, 1) Modified ucc_fast_init so that it can be used by fast UCC based TDM driver. Mainly changes have been made to configure TDM clocks and Fsyncs. 2) Modified get_brg_clk so that it can return the input frequncy and input source of any BRG by reading the corresponding entries from device tree. 3) Added new nodes brg and clocks in the device tree which represent input clocks for different BRGs. 4) Modified qe_setbrg accordingly. - new device tree entries added for clocks and brg [PATCH 3/3] Documentation - Modified Documentation to explain the device tree entries related to UCC TDM driver and the new nodes added(clocks and brg) The patch applies over a merge of galak's for-2.6.25 plus for-2.6.24 plus of_doc_update branches. In brief the steps were git clone git://git.kernel.org/pub/scm/linux/kernel/git/galak/powerpc.git powerpc-galak git checkout -b for-2.6.25 origin/for-2.6.25 git checkout -b for-2.6.24 origin/for-2.6.24 git checkout -b of_doc_update origin/of_doc_update git pull . for-2.6.24# merge the other two git pull . for-2.6.25 git checkout -b tdm # clean slate for tdm rebase work Also after applying the patches changes have to be made corresponding to Tabi's patch qe: add function qe_clock_source. The driver has been tested with a VoIP stack and application on MPC8323ERDB. With Regards Poonam -- To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
