1a895578d4
This patch adds a new DMA_TYPE for SSI dual FIFO script, included in SDMA firmware version 2. This script would allow SSI use dual fifo mode to transimit/receive data without occasional hardware underrun/overrun. Signed-off-by: Nicolin Chen <b42378@freescale.com> Acked-by: Kumar Gala <galak@codeaurora.org> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
80 lines
2.0 KiB
Plaintext
80 lines
2.0 KiB
Plaintext
* Freescale Smart Direct Memory Access (SDMA) Controller for i.MX
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Required properties:
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- compatible : Should be "fsl,imx31-sdma", "fsl,imx31-to1-sdma",
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"fsl,imx31-to2-sdma", "fsl,imx35-sdma", "fsl,imx35-to1-sdma",
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"fsl,imx35-to2-sdma", "fsl,imx51-sdma", "fsl,imx53-sdma" or
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"fsl,imx6q-sdma". The -to variants should be preferred since they
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allow to determnine the correct ROM script addresses needed for
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the driver to work without additional firmware.
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- reg : Should contain SDMA registers location and length
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- interrupts : Should contain SDMA interrupt
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- #dma-cells : Must be <3>.
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The first cell specifies the DMA request/event ID. See details below
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about the second and third cell.
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- fsl,sdma-ram-script-name : Should contain the full path of SDMA RAM
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scripts firmware
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The second cell of dma phandle specifies the peripheral type of DMA transfer.
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The full ID of peripheral types can be found below.
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ID transfer type
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---------------------
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0 MCU domain SSI
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1 Shared SSI
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2 MMC
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3 SDHC
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4 MCU domain UART
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5 Shared UART
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6 FIRI
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7 MCU domain CSPI
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8 Shared CSPI
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9 SIM
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10 ATA
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11 CCM
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12 External peripheral
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13 Memory Stick Host Controller
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14 Shared Memory Stick Host Controller
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15 DSP
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16 Memory
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17 FIFO type Memory
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18 SPDIF
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19 IPU Memory
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20 ASRC
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21 ESAI
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22 SSI Dual FIFO (needs firmware ver >= 2)
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The third cell specifies the transfer priority as below.
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ID transfer priority
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-------------------------
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0 High
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1 Medium
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2 Low
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Examples:
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sdma@83fb0000 {
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compatible = "fsl,imx51-sdma", "fsl,imx35-sdma";
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reg = <0x83fb0000 0x4000>;
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interrupts = <6>;
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#dma-cells = <3>;
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fsl,sdma-ram-script-name = "sdma-imx51.bin";
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};
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DMA clients connected to the i.MX SDMA controller must use the format
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described in the dma.txt file.
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Examples:
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ssi2: ssi@70014000 {
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compatible = "fsl,imx51-ssi", "fsl,imx21-ssi";
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reg = <0x70014000 0x4000>;
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interrupts = <30>;
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clocks = <&clks 49>;
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dmas = <&sdma 24 1 0>,
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<&sdma 25 1 0>;
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dma-names = "rx", "tx";
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fsl,fifo-depth = <15>;
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};
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