105 lines
4.4 KiB
Plaintext
105 lines
4.4 KiB
Plaintext
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Qualcomm Secure Digital Card Controller (SDCC)
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Secure Digital Card Controller provides host interface to
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SD/MMC/SDIO cards.
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Required properties:
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- compatible: should be "qcom,msm-sdcc"
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- reg: should contain SDCC (mandatory), SDCC-DML (optional) and BAM
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(optional) register maps.
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- reg-names: indicates various resources passed to driver (via reg
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property) by name. "reg-names" examples are "core_mem", "dml_mem"
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and "bam_mem". "dml_mem" and "bam_mem" are optional, and the SDCC
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driver will default to PIO mode when neither are present.
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- interrupts: should contain SDCC core interrupt.
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- interrupt-names: indicates interrupts passed to driver (via interrupts
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property) by name. "core_irq" is mandatory, "bam_irq" is mandatory only
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when BAM DMA engine is used. "status_irq" and "sdiowakeup_irq" are
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optional.
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- qcom,clk-rates: specifies supported SDCC clock frequencies, Units - Hz.
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- qcom,sup-voltages: specifies supported voltage ranges for card. Should
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always be specified in pairs (min, max), Units - mV.
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- <supply-name>-supply: phandle to the regulator device tree node.
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"supply-name" examples are "vdd", "vdd-io".
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Optional Properties:
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- cell-index: defines slot ID.
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- qcom,bus-width: defines the bus I/O width that controller supports.
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- wp-gpios: specify GPIO for write protect switch detection.
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- cd-gpios: specify GPIO for card detection.
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- qcom,nonremovable: specifies whether the card in slot is hot pluggable
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or hard wired.
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- qcom,disable-cmd23: disable sending CMD23 to card when controller
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can't support it.
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- qcom,bus-speed-mode: specifies supported bus speed modes by host.
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- qcom,current-limit: specifies max. current the host can drive.
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- qcom,xpc: specifies if the host can supply more than 150mA for SDXC
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cards.
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- qcom,dat1-mpm-int: specifies MPM interrupt number corresponding to
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DAT1 line of SDCC (used only if slot has dedicated DAT1 MSM pin
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(not GPIO))
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In the following, <supply> can be vdd (flash core voltage) or vdd-io
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(I/O voltage).
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- qcom,<supply>-always-on: specifies whether supply should be kept "on"
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always.
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- qcom,<supply>-lpm-sup: specifies whether supply can be kept in low
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power mode (lpm).
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- qcom,<supply>-voltage-level: specifies voltage levels for supply.
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Should be specified in pairs (min, max), units uV.
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- qcom,<supply>-current-level: specifies load levels for supply in
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lpm or high power mode (hpm). Should be specified in pairs (lpm, hpm),
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units uA.
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- gpios: specifies gpios assigned for sdcc slot.
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- qcom,gpio-names: a list of strings that map in order to the list
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of gpios. A slot has either gpios or dedicated tlmm pins as represented
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below.
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- qcom,pad-pull-on: Active pull configuration for sdc tlmm pins
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- qcom,pad-pull-off: Suspend pull configuration for sdc tlmm pins.
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- qcom,pad-drv-on: Active drive strength configuration for sdc tlmm pins.
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- qcom,pad-drv-off: Suspend drive strength configuration for sdc tlmm pins.
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Tlmm pins are specified as <clk cmd data>
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- qcom,bus-bw-vectors-bps: specifies array of throughput values in
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Bytes/sec. The values in the array are determined according to
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supported bus speed modes. For example, if host supports SDR12 mode,
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value is 13631488 Bytes/sec.
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- Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for
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below optional properties:
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- qcom,msm-bus,name
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- qcom,msm-bus,num-cases
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- qcom,msm-bus,active-only
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- qcom,msm-bus,num-paths
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- qcom,msm-bus,vectors-KBps
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Example:
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qcom,sdcc@f9600000 {
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/* SDC1 used as eMMC slot */
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cell-index = <1>;
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compatible = "qcom,msm-sdcc";
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reg = <0xf9600000 0x800 // SDCC register interface
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/* To use PIO instead of BAM, skip DML and BAM regs */
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0xf9600800 0x1800 // DML register interface
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0xf9602000 0x2000> // BAM register interface
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interrupts = <123>;
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qcom,clk-rates = <400000 24000000 48000000>;
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qcom,sup-voltages = <2700 3300>;
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qcom,bus-width = <8>; //8-bit wide
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qcom,nonremovable;
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qcom,msm-bus,name = "sdcc2";
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qcom,msm-bus,num-cases = <7>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps = <81 512 0 0>, /* No vote */
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<81 512 6656 13312>, /* 13 MB/s*/
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<81 512 13312 26624>, /* 26 MB/s */
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<81 512 26624 53248>, /* 52 MB/s */
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<81 512 53248 106496>, /* 104 MB/s */
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<81 512 106496 212992>, /* 208 MB/s */
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<81 512 2147483647 4294967295>; /* Max. bandwidth */
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qcom,bus-bw-vectors-bps = <0 13631488 27262976 54525952 109051904 218103808 4294967295>;
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};
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