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):
[EMAIL PROTECTED] {
#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 */
[EMAIL PROTECTED] {
compatible = "fsl,mpc8540-dma-channel",
"fsl,eloplus-dma-channel";
device-id = <0>; /* or cell-index ??? */
reg = <0 80>;
interrupt-parent = <&mpic>;
interrupts = <14 2>;
};
[EMAIL PROTECTED] { /* 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>;
};
[EMAIL PROTECTED] {
compatible = "fsl,mpc8540-dma-channel",
"fsl,eloplus-dma-channel";
device-id = <2>;
reg = <100 80>;
interrupt-parent = <&mpic>;
interrupts = <16 2>;
};
[EMAIL PROTECTED] {
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
Rupert-Mayer-Straße 45/1
Linhof Werksgelände
D-81379 München
Tel.089-741518-50
Fax 089-741518-19
http://www.anagramm-technology.com
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