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# SPDX-License-Identifier: (GPL-2.0)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra30-mc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NVIDIA Tegra30 SoC Memory Controller
maintainers:
- Dmitry Osipenko <digetx@gmail.com>
- Jon Hunter <jonathanh@nvidia.com>
- Thierry Reding <thierry.reding@gmail.com>
description: |
Tegra30 Memory Controller architecturally consists of the following parts:
Arbitration Domains, which can handle a single request or response per
clock from a group of clients. Typically, a system has a single Arbitration
Domain, but an implementation may divide the client space into multiple
Arbitration Domains to increase the effective system bandwidth.
Protocol Arbiter, which manage a related pool of memory devices. A system
may have a single Protocol Arbiter or multiple Protocol Arbiters.
Memory Crossbar, which routes request and responses between Arbitration
Domains and Protocol Arbiters. In the simplest version of the system, the
Memory Crossbar is just a pass through between a single Arbitration Domain
and a single Protocol Arbiter.
Global Resources, which include things like configuration registers which
are shared across the Memory Subsystem.
The Tegra30 Memory Controller handles memory requests from internal clients
and arbitrates among them to allocate memory bandwidth for DDR3L and LPDDR2
SDRAMs.
properties:
compatible:
const: nvidia,tegra30-mc
reg:
maxItems: 1
clocks:
maxItems: 1
clock-names:
items:
- const: mc
interrupts:
maxItems: 1
"#reset-cells":
const: 1
"#iommu-cells":
const: 1
"#interconnect-cells":
const: 1
patternProperties:
"^emc-timings-[0-9]+$":
type: object
properties:
nvidia,ram-code:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Value of RAM_CODE this timing set is used for.
patternProperties:
"^timing-[0-9]+$":
type: object
properties:
clock-frequency:
description:
Memory clock rate in Hz.
minimum: 1000000
maximum: 900000000
nvidia,emem-configuration:
$ref: /schemas/types.yaml#/definitions/uint32-array
description: |
Values to be written to the EMEM register block. See section
"18.13.1 MC Registers" in the TRM.
items:
- description: MC_EMEM_ARB_CFG
- description: MC_EMEM_ARB_OUTSTANDING_REQ
- description: MC_EMEM_ARB_TIMING_RCD
- description: MC_EMEM_ARB_TIMING_RP
- description: MC_EMEM_ARB_TIMING_RC
- description: MC_EMEM_ARB_TIMING_RAS
- description: MC_EMEM_ARB_TIMING_FAW
- description: MC_EMEM_ARB_TIMING_RRD
- description: MC_EMEM_ARB_TIMING_RAP2PRE
- description: MC_EMEM_ARB_TIMING_WAP2PRE
- description: MC_EMEM_ARB_TIMING_R2R
- description: MC_EMEM_ARB_TIMING_W2W
- description: MC_EMEM_ARB_TIMING_R2W
- description: MC_EMEM_ARB_TIMING_W2R
- description: MC_EMEM_ARB_DA_TURNS
- description: MC_EMEM_ARB_DA_COVERS
- description: MC_EMEM_ARB_MISC0
- description: MC_EMEM_ARB_RING1_THROTTLE
required:
- clock-frequency
- nvidia,emem-configuration
additionalProperties: false
required:
- nvidia,ram-code
additionalProperties: false
required:
- compatible
- reg
- interrupts
- clocks
- clock-names
- "#reset-cells"
- "#iommu-cells"
- "#interconnect-cells"
additionalProperties: false
examples:
- |
memory-controller@7000f000 {
compatible = "nvidia,tegra30-mc";
reg = <0x7000f000 0x400>;
clocks = <&tegra_car 32>;
clock-names = "mc";
interrupts = <0 77 4>;
#iommu-cells = <1>;
#reset-cells = <1>;
#interconnect-cells = <1>;
emc-timings-1 {
nvidia,ram-code = <1>;
timing-667000000 {
clock-frequency = <667000000>;
nvidia,emem-configuration = <
0x0000000a /* MC_EMEM_ARB_CFG */
0xc0000079 /* MC_EMEM_ARB_OUTSTANDING_REQ */
0x00000003 /* MC_EMEM_ARB_TIMING_RCD */
0x00000004 /* MC_EMEM_ARB_TIMING_RP */
0x00000010 /* MC_EMEM_ARB_TIMING_RC */
0x0000000b /* MC_EMEM_ARB_TIMING_RAS */
0x0000000a /* MC_EMEM_ARB_TIMING_FAW */
0x00000001 /* MC_EMEM_ARB_TIMING_RRD */
0x00000003 /* MC_EMEM_ARB_TIMING_RAP2PRE */
0x0000000b /* MC_EMEM_ARB_TIMING_WAP2PRE */
0x00000002 /* MC_EMEM_ARB_TIMING_R2R */
0x00000002 /* MC_EMEM_ARB_TIMING_W2W */
0x00000004 /* MC_EMEM_ARB_TIMING_R2W */
0x00000008 /* MC_EMEM_ARB_TIMING_W2R */
0x08040202 /* MC_EMEM_ARB_DA_TURNS */
0x00130b10 /* MC_EMEM_ARB_DA_COVERS */
0x70ea1f11 /* MC_EMEM_ARB_MISC0 */
0x001f0000 /* MC_EMEM_ARB_RING1_THROTTLE */
>;
};
};
};
|
