| Qualcomm CPR (Core Power Reduction) Regulator |
| |
| CPR regulator device is for Qualcomm RBCPR (RapidBridge CPR) on |
| application processor core. It takes voltage corner level |
| as input and converts it to actual voltage based on the |
| suggestions from factory production process. When CPR is |
| enabled for application processer core, it will suggest |
| scaling the voltage up or down for best performance and |
| power of the core. The scaling based on factory production |
| process is called PVS (Process Voltage Scaling) with efuse |
| bits to indicate what bin (and voltage range) a chip is in. |
| |
| Required properties: |
| - compatible: Must be "qcom,cpr-regulator" |
| - reg: Register addresses for RBCPR, RBCPR clock |
| select, PVS and CPR eFuse address |
| - reg-names: Register names. Must be "rbcpr", "rbcpr_clk", |
| "efuse_addr" |
| - regulator-name: A string used to describe the regulator |
| - interrupts: Interrupt line from RBCPR to interrupt controller. |
| - regulator-min-microvolt: Minimum corner value as min constraint, which |
| should be 1 for SVS corner |
| - regulator-max-microvolt: Maximum corner value as max constraint, which |
| should be 4 for SUPER_TURBO or 3 for TURBO |
| - qcom,pvs-init-voltage: A list of integers whose length is equal to 2 |
| to the power of qcom,pvs-fuse[num-of-bits]. The |
| location or 0-based index of an element in the |
| list corresponds to the bin number. The value of |
| each integer corresponds to the initial voltage |
| of the PVS bin in turbo mode in microvolts. |
| - qcom,pvs-corner-ceiling-slow: Ceiling voltages of all corners for APC_PVS_SLOW |
| - qcom,pvs-corner-ceiling-nom: Ceiling voltages of all corners for APC_PVS_NOM |
| - qcom,pvs-corner-ceiling-fast: Ceiling voltages of all corners for APC_PVS_FAST |
| The ceiling voltages for each of above three |
| properties may look like this: |
| 0 (SVS voltage): 1050000 uV |
| 1 (NORMAL voltage): 1150000 uV |
| 2 (TURBO voltage): 1275000 uV |
| - vdd-apc-supply: Regulator to supply VDD APC power |
| - qcom,vdd-apc-step-up-limit: Limit of vdd-apc-supply steps for scaling up. |
| - qcom,vdd-apc-step-down-limit: Limit of vdd-apc-supply steps for scaling down. |
| - qcom,cpr-ref-clk: The reference clock in kHz. |
| - qcom,cpr-timer-delay: The delay in microseconds for the timer interval. |
| - qcom,cpr-timer-cons-up: Consecutive number of timer interval (qcom,cpr-timer-delay) |
| occurred before issuing UP interrupt. |
| - qcom,cpr-timer-cons-down: Consecutive number of timer interval (qcom,cpr-timer-delay) |
| occurred before issuing DOWN interrupt. |
| - qcom,cpr-irq-line: Internal interrupt route signal of RBCPR, one of 0, 1 or 2. |
| - qcom,cpr-step-quotient: Number of CPR quotient (Ring Oscillator(RO) count) per vdd-apc-supply step |
| to issue error_steps. |
| - qcom,cpr-up-threshold: The threshold for CPR to issue interrupt when |
| error_steps is greater than it when stepping up. |
| - qcom,cpr-down-threshold: The threshold for CPR to issue interrupt when |
| error_steps is greater than it when stepping down. |
| - qcom,cpr-idle-clocks: Idle clock cycles RO can be in. |
| - qcom,cpr-gcnt-time: The time for gate count in microseconds. |
| - qcom,cpr-apc-volt-step: The voltage in microvolt per CPR step, such as 5000uV. |
| |
| - qcom,pvs-fuse-redun-sel: Array of 5 elements to indicate where to read the bits, what value to |
| compare with in order to decide if the redundant PVS fuse bits would be |
| used instead of the original bits and method to read fuse row, reading |
| register through SCM or directly. The 5 elements with index [0..4] are: |
| [0] => the fuse row number of the selector |
| [1] => LSB bit position of the bits |
| [2] => number of bits |
| [3] => the value to indicate redundant selection |
| [4] => fuse reading method, 0 for direct reading or 1 for SCM reading |
| When the value of the fuse bits specified by first 3 elements equals to |
| the value in 4th element, redundant PVS fuse bits should be selected. |
| Otherwise, the original PVS bits should be selected. If the 5th |
| element is 0, read the fuse row from register directly. Otherwise, |
| read it through SCM. |
| - qcom,pvs-fuse: Array of 4 elements to indicate the bits for PVS fuse and read method. |
| The array should have index and value like this: |
| [0] => the PVS fuse row number |
| [1] => LSB bit position of the bits |
| [2] => number of bits |
| [3] => fuse reading method, 0 for direct reading or 1 for SCM reading |
| - qcom,pvs-fuse-redun: Array of 4 elements to indicate the bits for redundant PVS fuse. |
| The array should have index and value like this: |
| [0] => the redundant PVS fuse row number |
| [1] => LSB bit position of the bits |
| [2] => number of bits |
| [3] => fuse reading method, 0 for direct reading or 1 for SCM reading |
| - qcom,cpr-fuse-redun-sel: Array of 5 elements to indicate where to read the bits, what value to |
| compare with in order to decide if the redundant CPR fuse bits would be |
| used instead of the original bits and method to read fuse row, using SCM |
| to read or read register directly. The 5 elements with index [0..4] are: |
| [0] => the fuse row number of the selector |
| [1] => LSB bit position of the bits |
| [2] => number of bits |
| [3] => the value to indicate redundant selection |
| [4] => fuse reading method, 0 for direct reading or 1 for SCM reading |
| When the value of the fuse bits specified by first 3 elements equals to |
| the value in 4th element, redundant CPR fuse bits should be selected. |
| Otherwise, the original CPR bits should be selected. If the 5th element |
| is 0, read the fuse row from register directly. Otherwise, read it through |
| SCM. |
| - qcom,cpr-fuse-row: Array of row number of CPR fuse and method to read that row. It should have |
| index and value like this: |
| [0] => the fuse row number |
| [1] => fuse reading method, 0 for direct reading or 1 for SCM reading |
| - qcom,cpr-fuse-bp-cpr-disable: Bit position of the bit to indicate if CPR should be disable |
| - qcom,cpr-fuse-bp-scheme: Bit position of the bit to indicate if it's a global/local scheme |
| - qcom,cpr-fuse-target-quot: Array of bit positions in fuse for Target Quotient of all corners. |
| It should have index and value like this: |
| [0] => bit position of the LSB bit for SVS target quotient |
| [1] => bit position of the LSB bit for NOMINAL target quotient |
| [2] => bit position of the LSB bit for TURBO target quotient |
| - qcom,cpr-fuse-ro-sel: Array of bit positions in fuse for RO select of all corners. |
| It should have index and value like this: |
| [0] => bit position of the LSB bit for SVS RO select bits |
| [1] => bit position of the LSB bit for NOMINAL RO select bits |
| [2] => bit position of the LSB bit for TURBO RO select bits |
| - qcom,cpr-fuse-redun-row: Array of row number of redundant CPR fuse and method to read that |
| row. It should have index and value like this: |
| [0] => the redundant fuse row number |
| [1] => the value to indicate reading the fuse row directly or using SCM |
| - qcom,cpr-fuse-redun-target-quot: Array of bit positions in fuse for redundant Target Quotient of all corners. |
| It should have index and value like this: |
| [0] => bit position of the LSB bit for redundant SVS target quotient |
| [1] => bit position of the LSB bit for redundant NOMINAL target quotient |
| [2] => bit position of the LSB bit for redundant TURBO target quotient |
| - qcom,cpr-fuse-redun-ro-sel: Array of bit positions in eFuse for redundant RO select. |
| It should have index and value like this: |
| [0] => bit position of the LSB bit for redundant SVS RO select bits |
| [1] => bit position of the LSB bit for redundant NOMINAL RO select bits |
| [2] => bit position of the LSB bit for redundant TURBO RO select bits |
| |
| |
| Optional properties: |
| - vdd-mx-supply: Regulator to supply memory power as dependency |
| of VDD APC. |
| - qcom,vdd-mx-vmax: The maximum voltage in uV for vdd-mx-supply. This |
| is required when vdd-mx-supply is present. |
| - qcom,vdd-mx-vmin-method: The method to determine the minimum voltage for |
| vdd-mx-supply, which can be one of following |
| choices compared with VDD APC: |
| 0 => equal to the voltage(vmin) of VDD APC |
| 1 => equal to PVS corner ceiling voltage |
| 2 => equal to slow speed corner ceiling |
| 3 => equal to qcom,vdd-mx-vmax |
| 4 => equal to VDD_APC corner mapped vdd-mx voltage |
| This is required when vdd-mx-supply is present. |
| - qcom,vdd-mx-corner-map: Array of 3 elements which defines the mapping from VDD_APC |
| fuse voltage corners to vdd-mx-supply voltages. |
| The 3 elements with index[0..2] are: |
| [0] => voltage to set for vdd-mx when VDD_APC is running at SVS corner |
| [1] => voltage to set for vdd-mx when VDD_APC is running at NOM corner |
| [2] => voltage to set for vdd-mx when VDD_APC is running at TURBO corner |
| This is required when the qcom,vdd-mx-vmin-method property has a value of 4. |
| - qcom,cpr-fuse-redun-bp-cpr-disable: Redundant bit position of the bit to indicate if CPR should be disable |
| - qcom,cpr-fuse-redun-bp-scheme: Redundant bit position of the bit to indicate if it's a global/local scheme |
| This property is required if cpr-fuse-redun-bp-cpr-disable |
| is present, and vise versa. |
| - qcom,cpr-enable: Present: CPR enabled by default. |
| Not Present: CPR disable by default. |
| - qcom,cpr-fuse-cond-min-volt-sel: Array of 5 elements to indicate where to read the bits, what value to |
| compare with in order to decide if the conditional minimum apc voltage needs |
| to be applied and the fuse reading method. |
| The 5 elements with index[0..4] are: |
| [0] => the fuse row number; |
| [1] => LSB bit position of the bits; |
| [2] => number of the bits; |
| [3] => the expected data to read; |
| [4] => fuse reading method, 0 for direct reading or 1 for SCM reading; |
| When the value of the fuse bits specified by first 3 elements is not equal to |
| the value in 4th element, then set the apc voltage for all parts running |
| at each voltage corner to be not lower than the voltage defined |
| using "qcom,cpr-cond-min-voltage". |
| - qcom,cpr-cond-min-voltage: Minimum voltage in microvolts for SVS, NOM and TURBO mode if the fuse bits |
| defined in qcom,cpr-fuse-cond-min-volt-sel have not been programmed with the |
| expected data. This is required if cpr-fuse-cond-min-volt-sel is present. |
| - qcom,cpr-fuse-uplift-sel: Array of 5 elements to indicate where to read the bits, what value to |
| compare with in order to enable or disable the pvs voltage uplift workaround, |
| and the fuse reading method. |
| The 5 elements with index[0..4] are: |
| [0]: => the fuse row number of the selector; |
| [1]: => LSB bit position of the bits; |
| [2]: => number of the bits; |
| [3]: => the value to indicate if the apc pvs voltage uplift workaround will |
| be enabled; |
| [4]: => fuse reading method, 0 for direct reading or 1 for SCM reading. |
| When the value of the fuse bits specified by first 3 elements equals to the |
| value in 4th element, the pvs voltage uplift workaround will be enabled. |
| - qcom,speed-bin-fuse-sel: Array of 4 elements to indicate where to read the speed bin of the processor, |
| and the fuse reading method. |
| The 4 elements with index[0..3] are: |
| [0]: => the fuse row number of the selector; |
| [1]: => LSB bit position of the bits; |
| [2]: => number of the bits; |
| [3]: => fuse reading method, 0 for direct reading or 1 for SCM reading. |
| This is required if cpr-fuse-uplift-disable-sel is present. |
| - qcom,cpr-uplift-voltage: Uplift in microvolts used for increasing pvs init voltage. If this property is present, |
| This is required if cpr-fuse-uplift-disable-sel is present. |
| - qcom,cpr-uplift-max-volt: Maximum voltage in microvolts used for pvs voltage uplift workaround to limit |
| the maximum pvs voltage. |
| This is required if cpr-fuse-uplift-disable-sel is present. |
| - qcom,cpr-uplift-quotient: Three numbers used for pvs voltage uplift workaround to be added to the target |
| quotient for each corner. |
| The 3 quotient increment with index[0..2] are: |
| [0]: => for SVS corner target quotient; |
| [1]: => for NORM corner target quotient; |
| [2]: => for TURBO corner target quotient; |
| This is required if cpr-fuse-uplift-disable-sel is present. |
| - qcom,cpr-uplift-speed-bin: The speed bin value corresponding to one type of processor which needs to apply the |
| pvs voltage uplift workaround. |
| This is required if cpr-fuse-uplift-disable-sel is present. |
| - qcom,cpr-quot-adjust-table: Array of triples in which each triple indicates the speed bin of the CPU, the virtual |
| corner to use and the quotient adjustment. |
| The 3 elements in one triple are: |
| [0]: => the speed bin of the CPU. |
| [1]: => the virtual voltage corner to use. |
| [2]: => the quotient adjustment for the corresponding virtual corner. |
| If the speed bin in a triple is equal to the speed bin of the CPU, the adjustment would |
| be subtracted from the quotient value of the voltage corner when the CPU is running at |
| that virtual corner. Each virtual corner value must be in the range 1 to the number of |
| elements in qcom,cpr-corner-map. |
| - qcom,cpr-corner-map: Array of elements of fuse corner value for each virtual corner. |
| The location or 1-based index of an element in the list corresponds to |
| the virtual corner value. For example, the first element in the list is the fuse corner |
| value that virtual corner 1 maps to. |
| This is required if qcom,cpr-quot-adjust-table is present. |
| - qcom,cpr-quotient-adjustment: Array of three elements of CPR quotient adjustments for each corner. |
| The 3 quotient adjustments with index[0..2] are: |
| [0] => amount to add to the SVS quotient |
| [1] => amount to add to the NORM quotient |
| [2] => amount to add to the TURBO quotient |
| If this property is specified, then the quotient adjustment values are added to the target |
| quotient values read from fuses before writing them into the CPR GCNT target control registers. |
| This property can be used to add static margin to the voltage rail managed by the CPR controller. |
| - vdd-apc-optional-prim-supply: Present: Regulator of highest priority to supply VDD APC power |
| Not Present: No such regulator. |
| - vdd-apc-optional-sec-supply: Present: Regulator of second highest priority to supply VDD APC power. |
| Not Present: No such regulator. |
| |
| Example: |
| apc_vreg_corner: regulator@f9018000 { |
| status = "okay"; |
| compatible = "qcom,cpr-regulator"; |
| reg = <0xf9018000 0x1000>, <0xfc4b8000 0x1000>; |
| reg-names = "rbcpr", "efuse_addr"; |
| interrupts = <0 15 0>; |
| regulator-name = "apc_corner"; |
| regulator-min-microvolt = <1>; |
| regulator-max-microvolt = <3>; |
| |
| qcom,pvs-fuse = <22 6 5 1>; |
| qcom,pvs-fuse-redun-sel = <22 24 3 2 1>; |
| qcom,pvs-fuse-redun = <22 27 5 1>; |
| |
| qcom,pvs-init-voltage = <1330000 1330000 1330000 1320000 |
| 1310000 1300000 1290000 1280000 |
| 1270000 1260000 1250000 1240000 |
| 1230000 1220000 1210000 1200000 |
| 1190000 1180000 1170000 1160000 |
| 1150000 1140000 1140000 1140000 |
| 1140000 1140000 1140000 1140000 |
| 1140000 1140000 1140000 1140000>; |
| qcom,pvs-corner-ceiling-slow = <1050000 1160000 1275000>; |
| qcom,pvs-corner-ceiling-nom = <975000 1075000 1200000>; |
| qcom,pvs-corner-ceiling-fast = <900000 1000000 1140000>; |
| vdd-apc-supply = <&pm8226_s2>; |
| vdd-apc-optional-prim-supply = <&ncp6335d>; |
| vdd-apc-optional-sec-supply = <&fan53555>; |
| vdd-mx-supply = <&pm8226_l3_ao>; |
| qcom,vdd-mx-vmax = <1350000>; |
| qcom,vdd-mx-vmin-method = <1>; |
| qcom,vdd-apc-step-up-limit = <1>; |
| qcom,vdd-apc-step-down-limit = <1>; |
| qcom,cpr-ref-clk = <19200>; |
| qcom,cpr-timer-delay = <5000>; |
| qcom,cpr-timer-cons-up = <1>; |
| qcom,cpr-timer-cons-down = <2>; |
| qcom,cpr-irq-line = <0>; |
| qcom,cpr-step-quotient = <15>; |
| qcom,cpr-up-threshold = <1>; |
| qcom,cpr-down-threshold = <2>; |
| qcom,cpr-idle-clocks = <5>; |
| qcom,cpr-gcnt-time = <1>; |
| qcom,cpr-apc-volt-step = <5000>; |
| |
| qcom,cpr-fuse-row = <138 1>; |
| qcom,cpr-fuse-bp-cpr-disable = <36>; |
| qcom,cpr-fuse-bp-scheme = <37>; |
| qcom,cpr-fuse-target-quot = <24 12 0>; |
| qcom,cpr-fuse-ro-sel = <54 38 41>; |
| qcom,cpr-fuse-redun-sel = <138 57 1 1 1>; |
| qcom,cpr-fuse-redun-row = <139 1>; |
| qcom,cpr-fuse-redun-target-quot = <24 12 0>; |
| qcom,cpr-fuse-redun-ro-sel = <46 36 39>; |
| qcom,cpr-fuse-cond-min-volt-sel = <54 42 6 7 1>; |
| qcom,cpr-cond-min-voltage = <1140000>; |
| qcom,cpr-fuse-uplift-sel = <22 53 1 0 0>; |
| qcom,cpr-uplift-voltage = <50000>; |
| qcom,cpr-uplift-quotient = <0 0 120>; |
| qcom,cpr-uplift-max-volt = <1350000>; |
| qcom,cpr-uplift-speed-bin = <1>; |
| qcom,speed-bin-fuse-sel = <22 0 3 0>; |
| qcom,cpr-corner-map = <1 1 2 2 3 3 3 3 3 3 3 3>; |
| qcom,cpr-quot-adjust-table = <1 1 0>, <1 2 0>, <1 3 0>, |
| <1 4 0>, <1 5 450>, <1 6 375>, |
| <1 7 300>, <1 8 225>, <1 9 187>, |
| <1 10 150>, <1 11 75>, <1 12 0>; |
| }; |
| |
