| * MSM Subsystem Power Manager (spm-v2) |
| |
| S4 generation of MSMs have SPM hardware blocks to control the Application |
| Processor Sub-System power. These SPM blocks run individual state machine |
| to determine what the core (L2 or Krait/Scorpion) would do when the WFI |
| instruction is executed by the core. The SAW hardware block handles SPM and |
| AVS functionality for the cores. |
| |
| The devicetree representation of the SPM block should be: |
| |
| Required properties |
| |
| - compatible: "qcom,spm-v2" |
| - reg: The physical address and the size of the SPM's memory mapped registers |
| - qcom,cpu: phandle for the CPU that the SPM block is attached to. This field |
| is required on only for SPMs that control the CPU. This field is not required |
| for SPMs that control L2/CCI/L3 |
| - qcom,saw2-ver-reg: The location of the version register |
| - qcom,name: The name with which a SPM device is identified by the power |
| management code. |
| |
| ---------------------------------------------------- |
| Non-PSCI targets should follow the rules shown below |
| ---------------------------------------------------- |
| Required properties for only Non-PSCI targets: |
| |
| - qcom,saw2-cfg: SAW2 configuration register |
| - qcom,saw2-spm-ctl: The SPM control register |
| - qcom,saw2-spm-dly: Provides the values for the SPM delay command in the SPM |
| sequence |
| |
| Optional properties for only Non-PSCI targets |
| - reg-names: Register names for the physical address required if spm device |
| has more than one physical addressed to be mapped. Allowed register |
| names are: "saw-base", "q2s", "hw-flush", "slpreq" |
| - qcom,saw2-avs-ctl: The AVS control register |
| - qcom,saw2-avs-hysterisis: The AVS hysterisis register to delay the AVS |
| controller requests |
| - qcom,vctl-timeout-us: The timeout value in us to wait for voltage to change |
| after sending the voltage command to the PMIC |
| - qcom,saw2-avs-limit: The AVS limit register |
| - qcom,saw2-avs-dly: The AVS delay register is used to specify the delay values |
| between AVS controller requests |
| - qcom,saw2-pmic-data0..7: Specify the pmic data value and the associated FTS |
| index to send the PMIC data to |
| - qcom,vctl-port: The PVC (PMIC Virtual Channel) port used for changing |
| voltage |
| - qcom,phase-port: The PVC port used for changing the number of phases |
| - qcom,pfm-port: The PVC port used for enabling PWM/PFM modes |
| - qcom,cpu-vctl-mask: Mask of cpus, whose voltage the spm device can control. |
| Depricated: Replaced with cpu-vctl-list when cpu phandles are available. |
| - qcom,cpu-vctl-list: List of cpu node phandles, whose voltage the spm device |
| can control. |
| - qcom,use-qchannel-for-pc: Boolean property to specify if qchannel should be |
| ignored when entering power collapse. If this property is set qchannel |
| will not be ignored in power collapse. |
| - qcom,supports-rpm-hs: Indicates that this SPM instance allow handshake with |
| RPM processor when executing the sleep command in the SPM sequence. Supported |
| only on SAW2 v3.0 and above. |
| - qcom,use-spm-clock-gating: This boolean property is used to indicate that |
| the SPM needs to be used for clock gating. Using the SPM for clock |
| gating would result in auto clock gating being disabled. Use this on |
| targets that do not support or do not use auto clock gating. |
| - qcom,use-qchannel-for-wfi: This boolean property is used to indicate |
| that the SPM gets triggerd by the qchannel and not by means of |
| wfi. So a wfe could trigger a spm for clock gating as well. |
| - modes: Lists all the available low power modes for the device |
| |
| Second level properties for modes |
| |
| Required properties (if modes node is available) |
| - qcom,label: Specifies the mode name such as: |
| qcom,saw2-spm-cmd-wfi: WFI mode |
| qcom,saw2-spm-cmd-ret: Retention mode |
| qcom,saw2-spm-cmd-spc: Standalone PC mode |
| qcom,saw2-spm-cmd-pc: Power Collapse mode |
| qcom,saw2-spm-cmd-gdhs: GDHS mode |
| - qcom,sequence: Specifies sequence for the low power mode |
| Optional properties |
| - qcom,pc_mode: Specifies pc_mode bit should be set in the SPM control register |
| - qcom,ret_mode: Specifies ret_mode bit should be set in the SPM control register |
| - qcom,spm_en: Specifies spm_en bit should be set in the SPM control register |
| - qcom,isar: Specifies isar bit should be set in the SPM control register |
| Specify this property only if SPM should retain its start address at |
| the end of the program. |
| - qcom,slp_cmd_mode: Specifies slp_cmd_mode bit should be set in SPM control register. |
| Adding this property results in SPM handshaking with RPM. Please remove |
| the RPM handshake command from the sleep sequence, replace that with |
| Sleep without RPM handshake command. |
| - qcom,event_sync: Specifies event_sync byte should be set in SPM control |
| register. |
| |
| ---------------------------------------------------- |
| PSCI targets should follow the rules shown below |
| ---------------------------------------------------- |
| Optional properties for only PSCI targets: |
| |
| - qcom,saw2-avs-ctl: The AVS control register |
| - qcom,saw2-avs-hysterisis: The AVS hysterisis register to delay the AVS |
| controller requests |
| - qcom,vctl-timeout-us: The timeout value in us to wait for voltage to change |
| after sending the voltage command to the PMIC |
| - qcom,saw2-avs-limit: The AVS limit register |
| - qcom,saw2-avs-dly: The AVS delay register is used to specify the delay values |
| between AVS controller requests |
| - qcom,vctl-port: The PVC (PMIC Virtual Channel) port used for changing |
| voltage |
| - qcom,phase-port: The PVC port used for changing the number of phases |
| - qcom,pfm-port: The PVC port used for enabling PWM/PFM modes |
| - qcom,cpu-vctl-list: List of cpu node phandles, whose voltage the spm device |
| can control. |
| |
| |
| Example 1: |
| qcom,spm@f9089000 { |
| compatible = "qcom,spm-v2"; |
| #address-cells = <1>; |
| #size-cells = <1>; |
| reg = <0xf9089000 0x1000>; |
| qcom,cpu = <&CPU0>; |
| qcom,saw2-ver-reg = <0xfd0>; |
| qcom,saw2-cfg = <0x1b>; |
| qcom,saw2-avs-ctl = <0>; |
| qcom,saw2-avs-hysteresis = <0>; |
| qcom,saw2-avs-limit = <0>; |
| qcom,saw2-avs-dly= <0>; |
| qcom,saw2-spm-dly= <0x20000400>; |
| qcom,saw2-spm-ctl = <0x1>; |
| qcom,cpu-vctl-list = <&CPU0 &CPU1 &CPU2 &CPU3>; |
| qcom,mode0 { |
| qcom,label = "qcom,saw2-spm-cmd-wfi"; |
| qcom,sequence = [03 0b 0f]; |
| qcom,spm_en; |
| }; |
| |
| qcom,mode1 { |
| qcom,label = "qcom,saw2-spm-cmd-spc"; |
| qcom,sequence = [00 20 50 80 60 70 10 92 |
| a0 b0 03 68 70 3b 92 a0 b0 |
| 82 2b 50 10 30 02 22 30 0f]; |
| qcom,spm_en; |
| qcom,pc_mode; |
| }; |
| |
| qcom,mode2 { |
| qcom,label = "qcom,saw2-spm-cmd-pc"; |
| qcom,sequence = [00 20 10 92 a0 b0 07 3b 92 |
| a0 b0 82 10 30 02 22 30 0f]; |
| qcom,spm_en; |
| qcom,pc_mode; |
| }; |
| }; |
| |
| Example 2: |
| qcom,spm@9A10000 { |
| compatible = "qcom,spm-v2"; |
| #address-cells = <1>; |
| #size-cells = <1>; |
| reg = <0x9A10000 0x1000>; |
| qcom,name = "system-cbf"; /* CBF SAW */ |
| qcom,saw2-ver-reg = <0xFD0>; |
| qcom,cpu-vctl-list = <&CPU0 &CPU1 &CPU2 &CPU3>; |
| qcom,vctl-timeout-us = <50>; |
| qcom,vctl-port = <0x0>; |
| qcom,phase-port = <0x1>; |
| qcom,saw2-avs-ctl = <0x1100>; |
| qcom,pfm-port = <0x2>; |
| }; |
| |