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The PAMU caches use the LIODNs to determine which cache lines hold the entries for the corresponding LIODs. The LIODNs must therefore be carefully assigned to avoid cache thrashing -- two active LIODs with LIODNs that put them in the same cache line. Currently, LIODNs are statically assigned by U-Boot, but this has limitations. LIODNs are assigned even for devices that may be disabled or unused by the kernel. Static assignments also do not allow for device drivers which may know which LIODs can be used simultaneously. In other words, we really should assign LIODNs dynamically in Linux. To do that, we need to describe the PAMU device and cache topologies in the device trees. Signed-off-by: Timur Tabi <timur@freescale.com> Acked-by: Stuart Yoder <stuart.yoder@freescale.com> Acked-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
* Global Utilities Block
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The global utilities block controls power management, I/O device
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enabling, power-on-reset configuration monitoring, general-purpose
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I/O signal configuration, alternate function selection for multiplexed
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signals, and clock control.
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Required properties:
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- compatible : Should define the compatible device type for
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global-utilities.
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- reg : Offset and length of the register set for the device.
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Recommended properties:
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- fsl,has-rstcr : Indicates that the global utilities register set
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contains a functioning "reset control register" (i.e. the board
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is wired to reset upon setting the HRESET_REQ bit in this register).
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- fsl,liodn-bits : Indicates the number of defined bits in the LIODN
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registers, for those SOCs that have a PAMU device.
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Examples:
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global-utilities@e0000 { /* global utilities block */
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compatible = "fsl,mpc8548-guts";
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reg = <e0000 1000>;
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fsl,has-rstcr;
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};
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guts: global-utilities@e0000 {
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compatible = "fsl,qoriq-device-config-1.0";
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reg = <0xe0000 0xe00>;
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fsl,has-rstcr;
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#sleep-cells = <1>;
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fsl,liodn-bits = <12>;
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};
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