3d5b3b0a44
o Move descriptors allocation to DMA engine driver o Add generic xdma_request() routine o Add less-generic scatter-gather application based on xdma interface Typical operation flow in peripheral device driver is: 1. Get xDMA controller sc->xdma_tx = xdma_ofw_get(sc->dev, "tx"); 2. Allocate virtual channel sc->xchan_tx = xdma_channel_alloc(sc->xdma_tx, caps); 3. Setup transfer status callback xdma_setup_intr(sc->xchan_tx, my_tx_intr, sc, &sc->ih_tx); 4. Request a transfer(s) ret = xdma_request(sc->xchan_tx, &req); 5. Free the channel xdma_channel_free(sc->xdma_tx); 6. Free the controller xdma_put(sc->xdma_tx); Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14971
110 lines
5.1 KiB
C
110 lines
5.1 KiB
C
/*-
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* Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/* DMA Channel Registers */
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#define PDMA_DSA(n) (0x00 + 0x20 * n) /* Channel n Source Address */
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#define PDMA_DTA(n) (0x04 + 0x20 * n) /* Channel n Target Address */
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#define PDMA_DTC(n) (0x08 + 0x20 * n) /* Channel n Transfer Count */
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#define PDMA_DRT(n) (0x0C + 0x20 * n) /* Channel n Request Source */
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#define DRT_AUTO (1 << 3) /* Auto-request. */
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#define PDMA_DCS(n) (0x10 + 0x20 * n) /* Channel n Control/Status */
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#define DCS_NDES (1 << 31) /* Non-descriptor mode. */
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#define DCS_DES8 (1 << 30) /* Descriptor 8 Word. */
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#define DCS_AR (1 << 4) /* Address Error. */
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#define DCS_TT (1 << 3) /* Transfer Terminate. */
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#define DCS_HLT (1 << 2) /* DMA halt. */
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#define DCS_CTE (1 << 0) /* Channel transfer enable. */
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#define PDMA_DCM(n) (0x14 + 0x20 * n) /* Channel n Command */
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#define DCM_SAI (1 << 23) /* Source Address Increment. */
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#define DCM_DAI (1 << 22) /* Destination Address Increment. */
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#define DCM_SP_S 14 /* Source port width. */
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#define DCM_SP_M (0x3 << DCM_SP_S)
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#define DCM_SP_1 (0x1 << DCM_SP_S) /* 1 byte */
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#define DCM_SP_2 (0x2 << DCM_SP_S) /* 2 bytes */
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#define DCM_SP_4 (0x0 << DCM_SP_S) /* 4 bytes */
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#define DCM_DP_S 12 /* Destination port width. */
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#define DCM_DP_M (0x3 << DCM_DP_S)
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#define DCM_DP_1 (0x1 << DCM_DP_S) /* 1 byte */
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#define DCM_DP_2 (0x2 << DCM_DP_S) /* 2 bytes */
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#define DCM_DP_4 (0x0 << DCM_DP_S) /* 4 bytes */
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#define DCM_TSZ_S 8 /* Transfer Data Size of a data unit. */
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#define DCM_TSZ_M (0x7 << DCM_TSZ_S)
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#define DCM_TSZ_A (0x7 << DCM_TSZ_S) /* Autonomy */
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#define DCM_TSZ_1 (0x1 << DCM_TSZ_S)
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#define DCM_TSZ_2 (0x2 << DCM_TSZ_S)
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#define DCM_TSZ_4 (0x0 << DCM_TSZ_S)
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#define DCM_TSZ_16 (0x3 << DCM_TSZ_S)
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#define DCM_TSZ_32 (0x4 << DCM_TSZ_S)
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#define DCM_TSZ_64 (0x5 << DCM_TSZ_S)
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#define DCM_TSZ_128 (0x6 << DCM_TSZ_S)
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#define DCM_TIE (1 << 1) /* Transfer Interrupt Enable (TIE). */
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#define DCM_LINK (1 << 0) /* Descriptor Link Enable. */
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#define PDMA_DDA(n) (0x18 + 0x20 * n) /* Channel n Descriptor Address */
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#define PDMA_DSD(n) (0x1C + 0x20 * n) /* Channel n Stride Difference */
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/* Global Control Registers */
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#define PDMA_DMAC 0x1000 /* DMA Control */
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#define DMAC_FMSC (1 << 31)
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#define DMAC_INTCC_S 17
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#define DMAC_INTCC_M (0x1f << DMAC_INTCC_S)
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#define DMAC_INTCE (1 << 16) /* Permit INTC_IRQ to be bound to one of programmable channel. */
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#define DMAC_HLT (1 << 3) /* Global halt status */
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#define DMAC_AR (1 << 2) /* Global address error status */
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#define DMAC_DMAE (1 << 0) /* Enable DMA. */
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#define PDMA_DIRQP 0x1004 /* DMA Interrupt Pending */
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#define PDMA_DDB 0x1008 /* DMA Doorbell */
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#define PDMA_DDS 0x100C /* DMA Doorbell Set */
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#define PDMA_DIP 0x1010 /* Descriptor Interrupt Pending */
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#define PDMA_DIC 0x1014 /* Descriptor Interrupt Clear */
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#define PDMA_DMACP 0x101C /* DMA Channel Programmable */
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#define PDMA_DSIRQP 0x1020 /* Channel soft IRQ to MCU */
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#define PDMA_DSIRQM 0x1024 /* Channel soft IRQ mask */
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#define PDMA_DCIRQP 0x1028 /* Channel IRQ to MCU */
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#define PDMA_DCIRQM 0x102C /* Channel IRQ to MCU mask */
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#define PDMA_DMCS 0x1030 /* MCU Control and Status */
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#define PDMA_DMNMB 0x1034 /* MCU Normal Mailbox */
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#define PDMA_DMSMB 0x1038 /* MCU Security Mailbox */
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#define PDMA_DMINT 0x103C /* MCU Interrupt */
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struct pdma_hwdesc {
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uint32_t dcm; /* DMA Channel Command */
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uint32_t dsa; /* DMA Source Address */
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uint32_t dta; /* DMA Target Address */
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uint32_t dtc; /* DMA Transfer Counter */
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uint32_t sd; /* Stride Address */
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uint32_t drt; /* DMA Request Type */
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uint32_t reserved[2];
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};
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#define CHAN_DESC_COUNT 4096
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#define CHAN_DESC_SIZE (sizeof(struct pdma_hwdesc) * CHAN_DESC_COUNT)
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