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| author | Tom Rini <trini@konsulko.com> | 2024-02-20 08:02:49 -0500 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2024-02-20 08:02:49 -0500 |
| commit | bebf916f9eb13aaf5bbf83fbd33204df5c6c9f8e (patch) | |
| tree | ce68a4801a1f9c82516aec08e641c3d29cb45c2e /doc | |
| parent | 3e6f2a94bfc25f1782ce2d45db27f47ec781feb1 (diff) | |
| parent | 1e81d12e34e874319e041652198a4ba561d751ab (diff) | |
Merge https://gitlab.denx.de/u-boot/custodians/u-boot-samsung
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/board/samsung/e850-96.rst | 87 | ||||
| -rw-r--r-- | doc/board/samsung/img/exynos850-boot-architecture.svg | 1283 | ||||
| -rw-r--r-- | doc/board/samsung/index.rst | 1 | ||||
| -rw-r--r-- | doc/device-tree-bindings/clock/samsung,exynos850-clock.yaml | 307 | ||||
| -rw-r--r-- | doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml | 85 | ||||
| -rw-r--r-- | doc/device-tree-bindings/soc/samsung/exynos-usi.yaml | 162 |
6 files changed, 1925 insertions, 0 deletions
diff --git a/doc/board/samsung/e850-96.rst b/doc/board/samsung/e850-96.rst new file mode 100644 index 0000000000..0cb95473e5 --- /dev/null +++ b/doc/board/samsung/e850-96.rst @@ -0,0 +1,87 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. sectionauthor:: Sam Protsenko <semen.protsenko@linaro.org> + +WinLink E850-96 board +===================== + +Overview +-------- + +WinLink's E850-96 board [1]_ is based on Samsung Exynos850 SoC and follows +96Boards Consumer Edition specification [2]_. That makes it possible to use +96Boards mezzanine boards [3]_ along with it. It's an open-hardware board and +the hardware design files [4]_ were published, along with the supported +software [5]_ and related documentation. + +U-Boot can be used on E850-96 instead of the original Samsung LittleKernel based +bootloader [6]_. Because FWBL1 [7]_ doesn't verify bootloader's signature, there +is no need to sign a U-Boot binary. That means U-Boot binary can be flashed into +``bootloader`` partition (instead of LittleKernel bootloader) and it will just +work. + +Because BL2 bootloader already sets up DRAM and runs the final bootloader +(U-Boot) from DRAM, there is no need in U-Boot SPL. It's enough to have only +U-Boot proper (``u-boot.bin``). + +Boot Flow +--------- + +The boot path for Exynos850 is shown on the figure below. + +.. image:: img/exynos850-boot-architecture.svg + :alt: Exynos850 SoC boot flow + +Legend: + +* ``BL0``: Boot ROM code +* ``BL1``: Software part of Boot ROM +* ``EPBL``: Exynos Primary Boot Loader +* ``BL2``: Initializes CMU and DRAM and runs the final bootloader +* ``Bootloader``: Final bootloader (e.g. U-Boot); also called BL33 in terms of + ARM boot flow +* ``EL3_MON``: EL3 monitor (trusted firmware, handles SMC calls); also called + BL31 in terms of ARM boot flow +* ``LDFW``: Loadable Firmware + +Build Procedure +--------------- + +.. warning:: + At the moment both eMMC and USB features are not enabled in U-Boot. Flashing + U-Boot binary **WILL** effectively brick your board. The ``dltool`` [8]_ can + be used then to perform USB boot and flash LittleKernel bootloader binary [7]_ + to unbrick and revive the board. Flashing U-Boot binary might be helpful for + developers or anybody who want to check current state of U-Boot enablement on + E850-96 (which is mostly serial console and related blocks). + +Build U-Boot binary from source code (using AArch64 baremetal GCC toolchain): + +.. prompt:: bash $ + + export PATH=<toolchain path>/bin:$PATH + export CROSS_COMPILE=<toolchain prefix> + make e850-96_defconfig + make + +Boot E850-96 board into fastboot mode as described in board software doc [9]_, +and flash U-Boot binary into ``bootloader`` eMMC partition: + +.. prompt:: bash $ + + fastboot flash bootloader u-boot.bin + fastboot reboot + +U-Boot will boot up to the shell. + +References +---------- + +.. [1] https://www.96boards.org/product/e850-96b/ +.. [2] https://www.96boards.org/products/ce/ +.. [3] https://www.96boards.org/products/mezzanine/ +.. [4] https://www.96boards.org/documentation/consumer/e850-96b/hardware-docs/ +.. [5] https://gitlab.com/Linaro/96boards/e850-96/ +.. [6] https://gitlab.com/Linaro/96boards/e850-96/lk +.. [7] https://gitlab.com/Linaro/96boards/e850-96/images +.. [8] https://gitlab.com/Linaro/96boards/e850-96/tools/dltool +.. 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b/doc/device-tree-bindings/clock/samsung,exynos850-clock.yaml new file mode 100644 index 0000000000..a0906efe12 --- /dev/null +++ b/doc/device-tree-bindings/clock/samsung,exynos850-clock.yaml @@ -0,0 +1,307 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/samsung,exynos850-clock.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung Exynos850 SoC clock controller + +maintainers: + - Sam Protsenko <semen.protsenko@linaro.org> + +description: | + Exynos850 clock controller is comprised of several CMU units, generating + clocks for different domains. Those CMU units are modeled as separate device + tree nodes, and might depend on each other. Root clocks in that clock tree are + two external clocks:: OSCCLK (26 MHz) and RTCCLK (32768 Hz). Those external + clocks must be defined as fixed-rate clocks in dts. + + CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and + dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP. + + Each clock is assigned an identifier and client nodes can use this identifier + to specify the clock which they consume. All clocks available for usage + in clock consumer nodes are defined as preprocessor macros in + 'dt-bindings/clock/exynos850.h' header. + +properties: + compatible: + enum: + - samsung,exynos850-cmu-top + - samsung,exynos850-cmu-apm + - samsung,exynos850-cmu-aud + - samsung,exynos850-cmu-cmgp + - samsung,exynos850-cmu-core + - samsung,exynos850-cmu-dpu + - samsung,exynos850-cmu-g3d + - samsung,exynos850-cmu-hsi + - samsung,exynos850-cmu-is + - samsung,exynos850-cmu-mfcmscl + - samsung,exynos850-cmu-peri + + clocks: + minItems: 1 + maxItems: 5 + + clock-names: + minItems: 1 + maxItems: 5 + + "#clock-cells": + const: 1 + + reg: + maxItems: 1 + +allOf: + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-top + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + + clock-names: + items: + - const: oscclk + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-apm + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_APM bus clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_clkcmu_apm_bus + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-aud + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: AUD clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_aud + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-cmgp + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_CMGP bus clock (from CMU_APM) + + clock-names: + items: + - const: oscclk + - const: gout_clkcmu_cmgp_bus + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-core + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_CORE bus clock (from CMU_TOP) + - description: CCI clock (from CMU_TOP) + - description: eMMC clock (from CMU_TOP) + - description: SSS clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_core_bus + - const: dout_core_cci + - const: dout_core_mmc_embd + - const: dout_core_sss + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-dpu + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: DPU clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_dpu + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-g3d + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: G3D clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_g3d_switch + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-hsi + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: External RTC clock (32768 Hz) + - description: CMU_HSI bus clock (from CMU_TOP) + - description: SD card clock (from CMU_TOP) + - description: USB 2.0 DRD clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: rtcclk + - const: dout_hsi_bus + - const: dout_hsi_mmc_card + - const: dout_hsi_usb20drd + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-is + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_IS bus clock (from CMU_TOP) + - description: Image Texture Processing core clock (from CMU_TOP) + - description: Visual Recognition Accelerator clock (from CMU_TOP) + - description: Geometric Distortion Correction clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_is_bus + - const: dout_is_itp + - const: dout_is_vra + - const: dout_is_gdc + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-mfcmscl + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: Multi-Format Codec clock (from CMU_TOP) + - description: Memory to Memory Scaler clock (from CMU_TOP) + - description: Multi-Channel Scaler clock (from CMU_TOP) + - description: JPEG codec clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_mfcmscl_mfc + - const: dout_mfcmscl_m2m + - const: dout_mfcmscl_mcsc + - const: dout_mfcmscl_jpeg + + - if: + properties: + compatible: + contains: + const: samsung,exynos850-cmu-peri + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_PERI bus clock (from CMU_TOP) + - description: UART clock (from CMU_TOP) + - description: Parent clock for HSI2C and SPI (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_peri_bus + - const: dout_peri_uart + - const: dout_peri_ip + +required: + - compatible + - "#clock-cells" + - clocks + - clock-names + - reg + +additionalProperties: false + +examples: + # Clock controller node for CMU_PERI + - | + #include <dt-bindings/clock/exynos850.h> + + cmu_peri: clock-controller@10030000 { + compatible = "samsung,exynos850-cmu-peri"; + reg = <0x10030000 0x8000>; + #clock-cells = <1>; + + clocks = <&oscclk>, <&cmu_top CLK_DOUT_PERI_BUS>, + <&cmu_top CLK_DOUT_PERI_UART>, + <&cmu_top CLK_DOUT_PERI_IP>; + clock-names = "oscclk", "dout_peri_bus", + "dout_peri_uart", "dout_peri_ip"; + }; + +... diff --git a/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml b/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml new file mode 100644 index 0000000000..c3e95c33b0 --- /dev/null +++ b/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/samsung/exynos-pmu.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung Exynos SoC series Power Management Unit (PMU) + +maintainers: + - Sam Protsenko <semen.protsenko@linaro.org> + +description: |+ + PMU block controls the power and operation states of Exynos SoC. It contains + registers for changing the state of next features:: + + - Local power control. Exynos SoCs have various power domains, and it's + possible to turn them on and off independently, using corresponding + registers in PMU block + - System-level power control. That allows putting the system into power-down + modes (sleep) by turning off the power for most of the domains + - Miscellaneous PMU related features + +# Custom select to avoid matching all nodes with 'syscon' +select: + properties: + compatible: + contains: + enum: + - samsung,exynos850-pmu + required: + - compatible + +properties: + compatible: + oneOf: + - items: + - enum: + - samsung,exynos850-pmu + - const: syscon + + reg: + maxItems: 1 + + samsung,uart-debug-1: + type: boolean + description: + Enable this property if AP UART lines (Application Processor UART) must be + connected to UART_DEBUG_1 path in PMU block. That's usually needed when + the serial console is provided by uart1_pins. If this property is not + specified, the default behavior will be used (AP UART lines connected to + UART_DEBUG_0 path, which usually means uart0_pins are used for the serial + console). + + syscon-poweroff: + $ref: /schemas/power/reset/syscon-poweroff.yaml# + type: object + description: + Node for power off method + + syscon-reboot: + $ref: /schemas/power/reset/syscon-reboot.yaml# + type: object + description: + Node for reboot method + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + pmu_system_controller: system-controller@11860000 { + compatible = "samsung,exynos850-pmu", "syscon"; + reg = <0x11860000 0x10000>; + + reboot: syscon-reboot { + compatible = "syscon-reboot"; + regmap = <&pmu_system_controller>; + offset = <0x3a00>; /* SYSTEM_CONFIGURATION */ + mask = <0x2>; /* SWRESET_SYSTEM */ + value = <0x2>; /* reset value */ + }; + }; diff --git a/doc/device-tree-bindings/soc/samsung/exynos-usi.yaml b/doc/device-tree-bindings/soc/samsung/exynos-usi.yaml new file mode 100644 index 0000000000..8e6423f115 --- /dev/null +++ b/doc/device-tree-bindings/soc/samsung/exynos-usi.yaml @@ -0,0 +1,162 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/samsung/exynos-usi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung's Exynos USI (Universal Serial Interface) + +maintainers: + - Sam Protsenko <semen.protsenko@linaro.org> + +description: | + USI IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C). + USI shares almost all internal circuits within each protocol, so only one + protocol can be chosen at a time. USI is modeled as a node with zero or more + child nodes, each representing a serial sub-node device. The mode setting + selects which particular function will be used. + +properties: + $nodename: + pattern: "^usi@[0-9a-f]+$" + + compatible: + enum: + - samsung,exynos850-usi + + reg: true + + clocks: true + + clock-names: true + + ranges: true + + "#address-cells": + const: 1 + + "#size-cells": + const: 1 + + samsung,sysreg: + $ref: /schemas/types.yaml#/definitions/phandle-array + items: + - items: + - description: phandle to System Register syscon node + - description: offset of SW_CONF register for this USI controller + description: + Should be phandle/offset pair. The phandle to System Register syscon node + (for the same domain where this USI controller resides) and the offset + of SW_CONF register for this USI controller. + + samsung,mode: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Selects USI function (which serial protocol to use). Refer to + <include/dt-bindings/soc/samsung,exynos-usi.h> for valid USI mode values. + + samsung,clkreq-on: + type: boolean + description: + Enable this property if underlying protocol requires the clock to be + continuously provided without automatic gating. As suggested by SoC + manual, it should be set in case of SPI/I2C slave, UART Rx and I2C + multi-master mode. Usually this property is needed if USI mode is set + to "UART". + + This property is optional. + +patternProperties: + "^i2c@[0-9a-f]+$": + $ref: /schemas/i2c/i2c-exynos5.yaml + description: Child node describing underlying I2C + + "^serial@[0-9a-f]+$": + $ref: /schemas/serial/samsung_uart.yaml + description: Child node describing underlying UART/serial + + "^spi@[0-9a-f]+$": + $ref: /schemas/spi/samsung,spi.yaml + description: Child node describing underlying SPI + +required: + - compatible + - ranges + - "#address-cells" + - "#size-cells" + - samsung,sysreg + - samsung,mode + +if: + properties: + compatible: + contains: + enum: + - samsung,exynos850-usi + +then: + properties: + reg: + maxItems: 1 + + clocks: + items: + - description: Bus (APB) clock + - description: Operating clock for UART/SPI/I2C protocol + + clock-names: + items: + - const: pclk + - const: ipclk + + required: + - reg + - clocks + - clock-names + +else: + properties: + reg: false + clocks: false + clock-names: false + samsung,clkreq-on: false + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/soc/samsung,exynos-usi.h> + + usi0: usi@138200c0 { + compatible = "samsung,exynos850-usi"; + reg = <0x138200c0 0x20>; + samsung,sysreg = <&sysreg_peri 0x1010>; + samsung,mode = <USI_V2_UART>; + samsung,clkreq-on; /* needed for UART mode */ + #address-cells = <1>; + #size-cells = <1>; + ranges; + clocks = <&cmu_peri 32>, <&cmu_peri 31>; + clock-names = "pclk", "ipclk"; + + serial_0: serial@13820000 { + compatible = "samsung,exynos850-uart"; + reg = <0x13820000 0xc0>; + interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&cmu_peri 32>, <&cmu_peri 31>; + clock-names = "uart", "clk_uart_baud0"; + status = "disabled"; + }; + + hsi2c_0: i2c@13820000 { + compatible = "samsung,exynosautov9-hsi2c"; + reg = <0x13820000 0xc0>; + interrupts = <GIC_SPI 227 IRQ_TYPE_LEVEL_HIGH>; + #address-cells = <1>; + #size-cells = <0>; + clocks = <&cmu_peri 31>, <&cmu_peri 32>; + clock-names = "hsi2c", "hsi2c_pclk"; + status = "disabled"; + }; + }; |
