From: Clemens Koller <clemens.koller@anagramm•de>
To: "linuxppc-dev@ozlabs•org" <linuxppc-dev@ozlabs•org>
Subject: MPC85xx DMA drivers, first testing results.
Date: Thu, 06 Dec 2007 22:49:38 +0100 [thread overview]
Message-ID: <47586E72.3050106@anagramm.de> (raw)
Hi There!
I just tried to use the fsldma on the mpc8540. It seems to work fine
here, but I would be glad if somebody can confirm before I move on:
I added the following to my mpc8540ads compatible board's .dts
(see my comments, where the not yet available documentation
was unclear):
dma@21000 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
device-id = <0>;
reg = <21300 4>; /* DGSR - DMA general status register */
/* reg = <21000 4>;*/ /* or use offset of DMA machine ??? */
ranges = <0 21100 200>; /* we have 4 DMA channels at 21100, size=80 each */
dma-channel@0 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
device-id = <0>; /* or cell-index ??? */
reg = <0 80>;
interrupt-parent = <&mpic>;
interrupts = <14 2>;
};
dma-channel@80 { /* or use 0,1,2,3 instead of 0,80,100,180 ??? */
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
device-id = <1>;
reg = <80 80>;
interrupt-parent = <&mpic>;
interrupts = <15 2>;
};
dma-channel@100 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
device-id = <2>;
reg = <100 80>;
interrupt-parent = <&mpic>;
interrupts = <16 2>;
};
dma-channel@180 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
device-id = <3>;
reg = <180 80>;
interrupt-parent = <&mpic>;
interrupts = <17 2>;
};
};
$ dmesg then says:
of-fsl-dma e0021300.dma: Probe the Freescale DMA driver for fsl,mpc8540-dma controller at 0xe0021300...
of-fsl-dma-channel e0021100.dma-channe: selftest: start...
of-fsl-dma-channel e0021100.dma-channe: selftest: finished, err=0.
of-fsl-dma-channel e0021100.dma-channe: #0 (fsl,mpc8540-dma-channel), irq 21
of-fsl-dma-channel e0021180.dma-channe: selftest: start...
of-fsl-dma-channel e0021180.dma-channe: selftest: finished, err=0.
of-fsl-dma-channel e0021180.dma-channe: #1 (fsl,mpc8540-dma-channel), irq 22
of-fsl-dma-channel e0021200.dma-channe: selftest: start...
of-fsl-dma-channel e0021200.dma-channe: selftest: finished, err=0.
of-fsl-dma-channel e0021200.dma-channe: #2 (fsl,mpc8540-dma-channel), irq 23
of-fsl-dma-channel e0021280.dma-channe: selftest: start...
of-fsl-dma-channel e0021280.dma-channe: selftest: finished, err=0.
of-fsl-dma-channel e0021280.dma-channe: #3 (fsl,mpc8540-dma-channel), irq 24
I added another dev_info() to get at least a glue that the selftest is run.
It looks like dev_info(fsl_chan->dev, ...); seems to be truncated.
I have no idea if interrupts are working well... the callback isn't
used yet.
Otherwise, nice work! :-) I'm looking forward to see this functionality
in mainline.
Regards,
--
Clemens Koller
__________________________________
R&D Imaging Devices
Anagramm GmbH
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Tel.089-741518-50
Fax 089-741518-19
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next reply other threads:[~2007-12-06 21:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-06 21:49 Clemens Koller [this message]
2007-12-07 1:31 ` MPC85xx DMA drivers, first testing results Timur Tabi
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