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afea03656a
This patch restructures the DMA bus settings and this is done by introducing a new platform structure used for programming the AXI Bus Mode Register inside the DMA module. This structure can be populated from device-tree as documented in the binding txt file. After initializing the DMA, the AXI register can be optionally tuned for platform drivers based. This patch also reworks some parameters to make coherent the DMA configuration now that AXI register is introduced. For example, the burst_len is managed by using the mentioned axi support above; so the snps,burst-len parameter has been removed. It makes sense to provide the AAL parameter from DT to Address-Aligned Beats inside the Register0 and review the PBL settings when initialize the engine. For PCI glue, rebuilding the story of this setting, it was added to align a configuration so not for fixing some known problem. No issue raised after this patch. It is safe to use the default burst length instead of tuning it to the maximum value Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
96 lines
3.8 KiB
Plaintext
96 lines
3.8 KiB
Plaintext
* STMicroelectronics 10/100/1000 Ethernet driver (GMAC)
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Required properties:
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- compatible: Should be "snps,dwmac-<ip_version>" "snps,dwmac"
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For backwards compatibility: "st,spear600-gmac" is also supported.
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- reg: Address and length of the register set for the device
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- interrupt-parent: Should be the phandle for the interrupt controller
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that services interrupts for this device
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- interrupts: Should contain the STMMAC interrupts
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- interrupt-names: Should contain the interrupt names "macirq"
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"eth_wake_irq" if this interrupt is supported in the "interrupts"
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property
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- phy-mode: See ethernet.txt file in the same directory.
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- snps,reset-gpio gpio number for phy reset.
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- snps,reset-active-low boolean flag to indicate if phy reset is active low.
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- snps,reset-delays-us is triplet of delays
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The 1st cell is reset pre-delay in micro seconds.
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The 2nd cell is reset pulse in micro seconds.
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The 3rd cell is reset post-delay in micro seconds.
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Optional properties:
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- resets: Should contain a phandle to the STMMAC reset signal, if any
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- reset-names: Should contain the reset signal name "stmmaceth", if a
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reset phandle is given
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- max-frame-size: See ethernet.txt file in the same directory
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- clocks: If present, the first clock should be the GMAC main clock and
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the second clock should be peripheral's register interface clock. Further
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clocks may be specified in derived bindings.
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- clock-names: One name for each entry in the clocks property, the
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first one should be "stmmaceth" and the second one should be "pclk".
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- clk_ptp_ref: this is the PTP reference clock; in case of the PTP is
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available this clock is used for programming the Timestamp Addend Register.
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If not passed then the system clock will be used and this is fine on some
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platforms.
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- tx-fifo-depth: See ethernet.txt file in the same directory
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- rx-fifo-depth: See ethernet.txt file in the same directory
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- snps,pbl Programmable Burst Length
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- snps,aal Address-Aligned Beats
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- snps,fixed-burst Program the DMA to use the fixed burst mode
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- snps,mixed-burst Program the DMA to use the mixed burst mode
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- snps,force_thresh_dma_mode Force DMA to use the threshold mode for
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both tx and rx
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- snps,force_sf_dma_mode Force DMA to use the Store and Forward
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mode for both tx and rx. This flag is
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ignored if force_thresh_dma_mode is set.
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- snps,multicast-filter-bins: Number of multicast filter hash bins
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supported by this device instance
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- snps,perfect-filter-entries: Number of perfect filter entries supported
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by this device instance
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- AXI BUS Mode parameters: below the list of all the parameters to program the
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AXI register inside the DMA module:
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- snps,lpi_en: enable Low Power Interface
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- snps,xit_frm: unlock on WoL
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- snps,wr_osr_lmt: max write oustanding req. limit
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- snps,rd_osr_lmt: max read oustanding req. limit
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- snps,kbbe: do not cross 1KiB boundary.
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- snps,axi_all: align address
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- snps,blen: this is a vector of supported burst length.
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- snps,fb: fixed-burst
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- snps,mb: mixed-burst
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- snps,rb: rebuild INCRx Burst
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- mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
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Examples:
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stmmac_axi_setup: stmmac-axi-config {
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snps,wr_osr_lmt = <0xf>;
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snps,rd_osr_lmt = <0xf>;
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snps,blen = <256 128 64 32 0 0 0>;
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};
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gmac0: ethernet@e0800000 {
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compatible = "st,spear600-gmac";
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reg = <0xe0800000 0x8000>;
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interrupt-parent = <&vic1>;
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interrupts = <24 23>;
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interrupt-names = "macirq", "eth_wake_irq";
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mac-address = [000000000000]; /* Filled in by U-Boot */
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max-frame-size = <3800>;
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phy-mode = "gmii";
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snps,multicast-filter-bins = <256>;
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snps,perfect-filter-entries = <128>;
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rx-fifo-depth = <16384>;
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tx-fifo-depth = <16384>;
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clocks = <&clock>;
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clock-names = "stmmaceth";
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snps,axi-config = <&stmmac_axi_setup>;
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mdio0 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "snps,dwmac-mdio";
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phy1: ethernet-phy@0 {
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};
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};
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};
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