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![Amireddy Mallikarjuna reddy](/assets/img/avatar_default.png)
Add DMA controller driver for Lightning Mountain (LGM) family of SoCs. The main function of the DMA controller is the transfer of data from/to any peripheral to/from the memory. A memory to memory copy capability can also be configured. This ldma driver is used for configure the device and channnels for data and control paths. Signed-off-by: Amireddy Mallikarjuna reddy <mallikarjunax.reddy@linux.intel.com> Link: https://lore.kernel.org/r/5fc54eb7ccfad4f8dd812b66b884054fc55cf050.1606905330.git.mallikarjunax.reddy@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
1739 lines
41 KiB
C
1739 lines
41 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lightning Mountain centralized DMA controller driver
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*
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* Copyright (c) 2016 - 2020 Intel Corporation.
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/iopoll.h>
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#include <linux/of_dma.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include "../dmaengine.h"
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#include "../virt-dma.h"
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#define DRIVER_NAME "lgm-dma"
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#define DMA_ID 0x0008
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#define DMA_ID_REV GENMASK(7, 0)
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#define DMA_ID_PNR GENMASK(19, 16)
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#define DMA_ID_CHNR GENMASK(26, 20)
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#define DMA_ID_DW_128B BIT(27)
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#define DMA_ID_AW_36B BIT(28)
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#define DMA_VER32 0x32
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#define DMA_VER31 0x31
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#define DMA_VER22 0x0A
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#define DMA_CTRL 0x0010
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#define DMA_CTRL_RST BIT(0)
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#define DMA_CTRL_DSRAM_PATH BIT(1)
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#define DMA_CTRL_DBURST_WR BIT(3)
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#define DMA_CTRL_VLD_DF_ACK BIT(4)
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#define DMA_CTRL_CH_FL BIT(6)
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#define DMA_CTRL_DS_FOD BIT(7)
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#define DMA_CTRL_DRB BIT(8)
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#define DMA_CTRL_ENBE BIT(9)
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#define DMA_CTRL_DESC_TMOUT_CNT_V31 GENMASK(27, 16)
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#define DMA_CTRL_DESC_TMOUT_EN_V31 BIT(30)
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#define DMA_CTRL_PKTARB BIT(31)
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#define DMA_CPOLL 0x0014
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#define DMA_CPOLL_CNT GENMASK(15, 4)
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#define DMA_CPOLL_EN BIT(31)
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#define DMA_CS 0x0018
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#define DMA_CS_MASK GENMASK(5, 0)
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#define DMA_CCTRL 0x001C
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#define DMA_CCTRL_ON BIT(0)
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#define DMA_CCTRL_RST BIT(1)
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#define DMA_CCTRL_CH_POLL_EN BIT(2)
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#define DMA_CCTRL_CH_ABC BIT(3) /* Adaptive Burst Chop */
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#define DMA_CDBA_MSB GENMASK(7, 4)
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#define DMA_CCTRL_DIR_TX BIT(8)
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#define DMA_CCTRL_CLASS GENMASK(11, 9)
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#define DMA_CCTRL_CLASSH GENMASK(19, 18)
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#define DMA_CCTRL_WR_NP_EN BIT(21)
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#define DMA_CCTRL_PDEN BIT(23)
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#define DMA_MAX_CLASS (SZ_32 - 1)
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#define DMA_CDBA 0x0020
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#define DMA_CDLEN 0x0024
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#define DMA_CIS 0x0028
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#define DMA_CIE 0x002C
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#define DMA_CI_EOP BIT(1)
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#define DMA_CI_DUR BIT(2)
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#define DMA_CI_DESCPT BIT(3)
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#define DMA_CI_CHOFF BIT(4)
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#define DMA_CI_RDERR BIT(5)
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#define DMA_CI_ALL \
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(DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF | DMA_CI_RDERR)
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#define DMA_PS 0x0040
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#define DMA_PCTRL 0x0044
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#define DMA_PCTRL_RXBL16 BIT(0)
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#define DMA_PCTRL_TXBL16 BIT(1)
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#define DMA_PCTRL_RXBL GENMASK(3, 2)
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#define DMA_PCTRL_RXBL_8 3
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#define DMA_PCTRL_TXBL GENMASK(5, 4)
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#define DMA_PCTRL_TXBL_8 3
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#define DMA_PCTRL_PDEN BIT(6)
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#define DMA_PCTRL_RXBL32 BIT(7)
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#define DMA_PCTRL_RXENDI GENMASK(9, 8)
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#define DMA_PCTRL_TXENDI GENMASK(11, 10)
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#define DMA_PCTRL_TXBL32 BIT(15)
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#define DMA_PCTRL_MEM_FLUSH BIT(16)
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#define DMA_IRNEN1 0x00E8
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#define DMA_IRNCR1 0x00EC
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#define DMA_IRNEN 0x00F4
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#define DMA_IRNCR 0x00F8
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#define DMA_C_DP_TICK 0x100
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#define DMA_C_DP_TICK_TIKNARB GENMASK(15, 0)
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#define DMA_C_DP_TICK_TIKARB GENMASK(31, 16)
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#define DMA_C_HDRM 0x110
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/*
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* If header mode is set in DMA descriptor,
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* If bit 30 is disabled, HDR_LEN must be configured according to channel
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* requirement.
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* If bit 30 is enabled(checksum with heade mode), HDR_LEN has no need to
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* be configured. It will enable check sum for switch
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* If header mode is not set in DMA descriptor,
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* This register setting doesn't matter
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*/
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#define DMA_C_HDRM_HDR_SUM BIT(30)
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#define DMA_C_BOFF 0x120
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#define DMA_C_BOFF_BOF_LEN GENMASK(7, 0)
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#define DMA_C_BOFF_EN BIT(31)
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#define DMA_ORRC 0x190
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#define DMA_ORRC_ORRCNT GENMASK(8, 4)
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#define DMA_ORRC_EN BIT(31)
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#define DMA_C_ENDIAN 0x200
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#define DMA_C_END_DATAENDI GENMASK(1, 0)
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#define DMA_C_END_DE_EN BIT(7)
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#define DMA_C_END_DESENDI GENMASK(9, 8)
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#define DMA_C_END_DES_EN BIT(16)
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/* DMA controller capability */
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#define DMA_ADDR_36BIT BIT(0)
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#define DMA_DATA_128BIT BIT(1)
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#define DMA_CHAN_FLOW_CTL BIT(2)
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#define DMA_DESC_FOD BIT(3)
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#define DMA_DESC_IN_SRAM BIT(4)
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#define DMA_EN_BYTE_EN BIT(5)
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#define DMA_DBURST_WR BIT(6)
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#define DMA_VALID_DESC_FETCH_ACK BIT(7)
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#define DMA_DFT_DRB BIT(8)
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#define DMA_ORRC_MAX_CNT (SZ_32 - 1)
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#define DMA_DFT_POLL_CNT SZ_4
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#define DMA_DFT_BURST_V22 SZ_2
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#define DMA_BURSTL_8DW SZ_8
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#define DMA_BURSTL_16DW SZ_16
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#define DMA_BURSTL_32DW SZ_32
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#define DMA_DFT_BURST DMA_BURSTL_16DW
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#define DMA_MAX_DESC_NUM (SZ_8K - 1)
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#define DMA_CHAN_BOFF_MAX (SZ_256 - 1)
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#define DMA_DFT_ENDIAN 0
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#define DMA_DFT_DESC_TCNT 50
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#define DMA_HDR_LEN_MAX (SZ_16K - 1)
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/* DMA flags */
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#define DMA_TX_CH BIT(0)
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#define DMA_RX_CH BIT(1)
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#define DEVICE_ALLOC_DESC BIT(2)
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#define CHAN_IN_USE BIT(3)
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#define DMA_HW_DESC BIT(4)
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/* Descriptor fields */
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#define DESC_DATA_LEN GENMASK(15, 0)
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#define DESC_BYTE_OFF GENMASK(25, 23)
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#define DESC_EOP BIT(28)
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#define DESC_SOP BIT(29)
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#define DESC_C BIT(30)
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#define DESC_OWN BIT(31)
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#define DMA_CHAN_RST 1
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#define DMA_MAX_SIZE (BIT(16) - 1)
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#define MAX_LOWER_CHANS 32
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#define MASK_LOWER_CHANS GENMASK(4, 0)
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#define DMA_OWN 1
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#define HIGH_4_BITS GENMASK(3, 0)
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#define DMA_DFT_DESC_NUM 1
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#define DMA_PKT_DROP_DIS 0
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enum ldma_chan_on_off {
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DMA_CH_OFF = 0,
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DMA_CH_ON = 1,
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};
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enum {
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DMA_TYPE_TX = 0,
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DMA_TYPE_RX,
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DMA_TYPE_MCPY,
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};
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struct ldma_dev;
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struct ldma_port;
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struct ldma_chan {
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struct virt_dma_chan vchan;
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struct ldma_port *port; /* back pointer */
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char name[8]; /* Channel name */
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int nr; /* Channel id in hardware */
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u32 flags; /* central way or channel based way */
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enum ldma_chan_on_off onoff;
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dma_addr_t desc_phys;
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void *desc_base; /* Virtual address */
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u32 desc_cnt; /* Number of descriptors */
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int rst;
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u32 hdrm_len;
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bool hdrm_csum;
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u32 boff_len;
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u32 data_endian;
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u32 desc_endian;
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bool pden;
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bool desc_rx_np;
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bool data_endian_en;
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bool desc_endian_en;
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bool abc_en;
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bool desc_init;
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struct dma_pool *desc_pool; /* Descriptors pool */
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u32 desc_num;
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struct dw2_desc_sw *ds;
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struct work_struct work;
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struct dma_slave_config config;
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};
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struct ldma_port {
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struct ldma_dev *ldev; /* back pointer */
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u32 portid;
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u32 rxbl;
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u32 txbl;
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u32 rxendi;
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u32 txendi;
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u32 pkt_drop;
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};
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/* Instance specific data */
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struct ldma_inst_data {
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bool desc_in_sram;
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bool chan_fc;
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bool desc_fod; /* Fetch On Demand */
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bool valid_desc_fetch_ack;
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u32 orrc; /* Outstanding read count */
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const char *name;
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u32 type;
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};
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struct ldma_dev {
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struct device *dev;
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void __iomem *base;
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struct reset_control *rst;
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struct clk *core_clk;
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struct dma_device dma_dev;
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u32 ver;
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int irq;
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struct ldma_port *ports;
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struct ldma_chan *chans; /* channel list on this DMA or port */
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spinlock_t dev_lock; /* Controller register exclusive */
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u32 chan_nrs;
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u32 port_nrs;
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u32 channels_mask;
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u32 flags;
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u32 pollcnt;
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const struct ldma_inst_data *inst;
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struct workqueue_struct *wq;
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};
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struct dw2_desc {
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u32 field;
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u32 addr;
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} __packed __aligned(8);
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struct dw2_desc_sw {
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struct virt_dma_desc vdesc;
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struct ldma_chan *chan;
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dma_addr_t desc_phys;
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size_t desc_cnt;
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size_t size;
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struct dw2_desc *desc_hw;
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};
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static inline void
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ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs)
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{
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u32 old_val, new_val;
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old_val = readl(d->base + ofs);
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new_val = (old_val & ~mask) | (val & mask);
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if (new_val != old_val)
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writel(new_val, d->base + ofs);
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}
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static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct ldma_chan, vchan.chan);
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}
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static inline struct ldma_dev *to_ldma_dev(struct dma_device *dma_dev)
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{
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return container_of(dma_dev, struct ldma_dev, dma_dev);
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}
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static inline struct dw2_desc_sw *to_lgm_dma_desc(struct virt_dma_desc *vdesc)
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{
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return container_of(vdesc, struct dw2_desc_sw, vdesc);
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}
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static inline bool ldma_chan_tx(struct ldma_chan *c)
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{
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return !!(c->flags & DMA_TX_CH);
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}
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static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c)
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{
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return !!(c->flags & DMA_HW_DESC);
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}
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static void ldma_dev_reset(struct ldma_dev *d)
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{
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unsigned long flags;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask = DMA_CTRL_PKTARB;
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u32 val = enable ? DMA_CTRL_PKTARB : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask = DMA_CTRL_DSRAM_PATH;
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u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask, val;
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if (d->inst->type != DMA_TYPE_TX)
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return;
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mask = DMA_CTRL_CH_FL;
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val = enable ? DMA_CTRL_CH_FL : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_global_polling_enable(struct ldma_dev *d)
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{
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unsigned long flags;
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u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT;
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u32 val = DMA_CPOLL_EN;
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val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt);
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CPOLL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask, val;
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if (d->inst->type == DMA_TYPE_MCPY)
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return;
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mask = DMA_CTRL_DS_FOD;
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val = enable ? DMA_CTRL_DS_FOD : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask = DMA_CTRL_ENBE;
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u32 val = enable ? DMA_CTRL_ENBE : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_orrc_cfg(struct ldma_dev *d)
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{
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unsigned long flags;
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u32 val = 0;
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u32 mask;
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if (d->inst->type == DMA_TYPE_RX)
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return;
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mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT;
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if (d->inst->orrc > 0 && d->inst->orrc <= DMA_ORRC_MAX_CNT)
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val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->inst->orrc);
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_ORRC);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int tcnt)
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{
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u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31;
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unsigned long flags;
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u32 val;
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if (enable)
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val = DMA_CTRL_DESC_TMOUT_EN_V31 | FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt);
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else
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val = 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask, val;
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if (d->inst->type != DMA_TYPE_RX && d->inst->type != DMA_TYPE_MCPY)
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return;
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mask = DMA_CTRL_DBURST_WR;
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val = enable ? DMA_CTRL_DBURST_WR : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool enable)
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{
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unsigned long flags;
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u32 mask, val;
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if (d->inst->type != DMA_TYPE_TX)
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return;
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mask = DMA_CTRL_VLD_DF_ACK;
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val = enable ? DMA_CTRL_VLD_DF_ACK : 0;
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spin_lock_irqsave(&d->dev_lock, flags);
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ldma_update_bits(d, mask, val, DMA_CTRL);
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spin_unlock_irqrestore(&d->dev_lock, flags);
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}
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|
|
static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable)
|
|
{
|
|
unsigned long flags;
|
|
u32 mask = DMA_CTRL_DRB;
|
|
u32 val = enable ? DMA_CTRL_DRB : 0;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, mask, val, DMA_CTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
}
|
|
|
|
static int ldma_dev_cfg(struct ldma_dev *d)
|
|
{
|
|
bool enable;
|
|
|
|
ldma_dev_pkt_arb_cfg(d, true);
|
|
ldma_dev_global_polling_enable(d);
|
|
|
|
enable = !!(d->flags & DMA_DFT_DRB);
|
|
ldma_dev_drb_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_EN_BYTE_EN);
|
|
ldma_dev_byte_enable_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_CHAN_FLOW_CTL);
|
|
ldma_dev_chan_flow_ctl_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_DESC_FOD);
|
|
ldma_dev_desc_fetch_on_demand_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_DESC_IN_SRAM);
|
|
ldma_dev_sram_desc_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_DBURST_WR);
|
|
ldma_dev_dburst_wr_cfg(d, enable);
|
|
|
|
enable = !!(d->flags & DMA_VALID_DESC_FETCH_ACK);
|
|
ldma_dev_vld_fetch_ack_cfg(d, enable);
|
|
|
|
if (d->ver > DMA_VER22) {
|
|
ldma_dev_orrc_cfg(d);
|
|
ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT);
|
|
}
|
|
|
|
dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n",
|
|
d->inst->name, readl(d->base + DMA_CTRL));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 class_low, class_high;
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
reg = readl(d->base + DMA_CCTRL);
|
|
/* Read from hardware */
|
|
if (reg & DMA_CCTRL_DIR_TX)
|
|
c->flags |= DMA_TX_CH;
|
|
else
|
|
c->flags |= DMA_RX_CH;
|
|
|
|
/* Keep the class value unchanged */
|
|
class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
|
|
class_high = FIELD_GET(DMA_CCTRL_CLASSH, reg);
|
|
val &= ~DMA_CCTRL_CLASS;
|
|
val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
|
|
val &= ~DMA_CCTRL_CLASSH;
|
|
val |= FIELD_PREP(DMA_CCTRL_CLASSH, class_high);
|
|
writel(val, d->base + DMA_CCTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ldma_chan_irq_init(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
u32 enofs, crofs;
|
|
u32 cn_bit;
|
|
|
|
if (c->nr < MAX_LOWER_CHANS) {
|
|
enofs = DMA_IRNEN;
|
|
crofs = DMA_IRNCR;
|
|
} else {
|
|
enofs = DMA_IRNEN1;
|
|
crofs = DMA_IRNCR1;
|
|
}
|
|
|
|
cn_bit = BIT(c->nr & MASK_LOWER_CHANS);
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
|
|
/* Clear all interrupts and disabled it */
|
|
writel(0, d->base + DMA_CIE);
|
|
writel(DMA_CI_ALL, d->base + DMA_CIS);
|
|
|
|
ldma_update_bits(d, cn_bit, 0, enofs);
|
|
writel(cn_bit, d->base + crofs);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
}
|
|
|
|
static void ldma_chan_set_class(struct ldma_chan *c, u32 val)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 class_val;
|
|
|
|
if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS)
|
|
return;
|
|
|
|
/* 3 bits low */
|
|
class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
|
|
/* 2 bits high */
|
|
class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3);
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH, class_val,
|
|
DMA_CCTRL);
|
|
}
|
|
|
|
static int ldma_chan_on(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
|
|
/* If descriptors not configured, not allow to turn on channel */
|
|
if (WARN_ON(!c->desc_init))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
c->onoff = DMA_CH_ON;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ldma_chan_off(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
u32 val;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
|
|
!(val & DMA_CCTRL_ON), 0, 10000);
|
|
if (ret)
|
|
return ret;
|
|
|
|
c->onoff = DMA_CH_OFF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t desc_base,
|
|
int desc_num)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
writel(lower_32_bits(desc_base), d->base + DMA_CDBA);
|
|
|
|
/* Higher 4 bits of 36 bit addressing */
|
|
if (IS_ENABLED(CONFIG_64BIT)) {
|
|
u32 hi = upper_32_bits(desc_base) & HIGH_4_BITS;
|
|
|
|
ldma_update_bits(d, DMA_CDBA_MSB,
|
|
FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL);
|
|
}
|
|
writel(desc_num, d->base + DMA_CDLEN);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
c->desc_init = true;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
ldma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, int desc_num)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
struct dma_async_tx_descriptor *tx;
|
|
struct dw2_desc_sw *ds;
|
|
|
|
if (!desc_num) {
|
|
dev_err(d->dev, "Channel %d must allocate descriptor first\n",
|
|
c->nr);
|
|
return NULL;
|
|
}
|
|
|
|
if (desc_num > DMA_MAX_DESC_NUM) {
|
|
dev_err(d->dev, "Channel %d descriptor number out of range %d\n",
|
|
c->nr, desc_num);
|
|
return NULL;
|
|
}
|
|
|
|
ldma_chan_desc_hw_cfg(c, desc_base, desc_num);
|
|
|
|
c->flags |= DMA_HW_DESC;
|
|
c->desc_cnt = desc_num;
|
|
c->desc_phys = desc_base;
|
|
|
|
ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
|
|
if (!ds)
|
|
return NULL;
|
|
|
|
tx = &ds->vdesc.tx;
|
|
dma_async_tx_descriptor_init(tx, chan);
|
|
|
|
return tx;
|
|
}
|
|
|
|
static int ldma_chan_reset(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = ldma_chan_off(c);
|
|
if (ret)
|
|
return ret;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val,
|
|
!(val & DMA_CCTRL_RST), 0, 10000);
|
|
if (ret)
|
|
return ret;
|
|
|
|
c->rst = 1;
|
|
c->desc_init = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32 boff_len)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN;
|
|
u32 val;
|
|
|
|
if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX)
|
|
val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) | DMA_C_BOFF_EN;
|
|
else
|
|
val = 0;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_C_BOFF);
|
|
}
|
|
|
|
static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool enable,
|
|
u32 endian_type)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI;
|
|
u32 val;
|
|
|
|
if (enable)
|
|
val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI, endian_type);
|
|
else
|
|
val = 0;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
|
|
}
|
|
|
|
static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool enable,
|
|
u32 endian_type)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI;
|
|
u32 val;
|
|
|
|
if (enable)
|
|
val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI, endian_type);
|
|
else
|
|
val = 0;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_C_ENDIAN);
|
|
}
|
|
|
|
static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len, bool csum)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask, val;
|
|
|
|
/* NB, csum disabled, hdr length must be provided */
|
|
if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX))
|
|
return;
|
|
|
|
mask = DMA_C_HDRM_HDR_SUM;
|
|
val = DMA_C_HDRM_HDR_SUM;
|
|
|
|
if (!csum && hdr_len)
|
|
val = hdr_len;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_C_HDRM);
|
|
}
|
|
|
|
static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask, val;
|
|
|
|
/* Only valid for RX channel */
|
|
if (ldma_chan_tx(c))
|
|
return;
|
|
|
|
mask = DMA_CCTRL_WR_NP_EN;
|
|
val = enable ? DMA_CCTRL_WR_NP_EN : 0;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_CCTRL);
|
|
}
|
|
|
|
static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 mask, val;
|
|
|
|
if (d->ver < DMA_VER32 || ldma_chan_tx(c))
|
|
return;
|
|
|
|
mask = DMA_CCTRL_CH_ABC;
|
|
val = enable ? DMA_CCTRL_CH_ABC : 0;
|
|
|
|
ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS);
|
|
ldma_update_bits(d, mask, val, DMA_CCTRL);
|
|
}
|
|
|
|
static int ldma_port_cfg(struct ldma_port *p)
|
|
{
|
|
unsigned long flags;
|
|
struct ldma_dev *d;
|
|
u32 reg;
|
|
|
|
d = p->ldev;
|
|
reg = FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi);
|
|
reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi);
|
|
|
|
if (d->ver == DMA_VER22) {
|
|
reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl);
|
|
reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl);
|
|
} else {
|
|
reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop);
|
|
|
|
if (p->txbl == DMA_BURSTL_32DW)
|
|
reg |= DMA_PCTRL_TXBL32;
|
|
else if (p->txbl == DMA_BURSTL_16DW)
|
|
reg |= DMA_PCTRL_TXBL16;
|
|
else
|
|
reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8);
|
|
|
|
if (p->rxbl == DMA_BURSTL_32DW)
|
|
reg |= DMA_PCTRL_RXBL32;
|
|
else if (p->rxbl == DMA_BURSTL_16DW)
|
|
reg |= DMA_PCTRL_RXBL16;
|
|
else
|
|
reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8);
|
|
}
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
writel(p->portid, d->base + DMA_PS);
|
|
writel(reg, d->base + DMA_PCTRL);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
reg = readl(d->base + DMA_PCTRL); /* read back */
|
|
dev_dbg(d->dev, "Port Control 0x%08x configuration done\n", reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ldma_chan_cfg(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
reg = c->pden ? DMA_CCTRL_PDEN : 0;
|
|
reg |= c->onoff ? DMA_CCTRL_ON : 0;
|
|
reg |= c->rst ? DMA_CCTRL_RST : 0;
|
|
|
|
ldma_chan_cctrl_cfg(c, reg);
|
|
ldma_chan_irq_init(c);
|
|
|
|
if (d->ver <= DMA_VER22)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
ldma_chan_set_class(c, c->nr);
|
|
ldma_chan_byte_offset_cfg(c, c->boff_len);
|
|
ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian);
|
|
ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian);
|
|
ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum);
|
|
ldma_chan_rxwr_np_cfg(c, c->desc_rx_np);
|
|
ldma_chan_abc_cfg(c, c->abc_en);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
|
|
if (ldma_chan_is_hw_desc(c))
|
|
ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ldma_dev_init(struct ldma_dev *d)
|
|
{
|
|
unsigned long ch_mask = (unsigned long)d->channels_mask;
|
|
struct ldma_port *p;
|
|
struct ldma_chan *c;
|
|
int i;
|
|
u32 j;
|
|
|
|
spin_lock_init(&d->dev_lock);
|
|
ldma_dev_reset(d);
|
|
ldma_dev_cfg(d);
|
|
|
|
/* DMA port initialization */
|
|
for (i = 0; i < d->port_nrs; i++) {
|
|
p = &d->ports[i];
|
|
ldma_port_cfg(p);
|
|
}
|
|
|
|
/* DMA channel initialization */
|
|
for_each_set_bit(j, &ch_mask, d->chan_nrs) {
|
|
c = &d->chans[j];
|
|
ldma_chan_cfg(c);
|
|
}
|
|
}
|
|
|
|
static int ldma_cfg_init(struct ldma_dev *d)
|
|
{
|
|
struct fwnode_handle *fwnode = dev_fwnode(d->dev);
|
|
struct ldma_port *p;
|
|
int i;
|
|
|
|
if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
|
|
d->flags |= DMA_EN_BYTE_EN;
|
|
|
|
if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
|
|
d->flags |= DMA_DBURST_WR;
|
|
|
|
if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
|
|
d->flags |= DMA_DFT_DRB;
|
|
|
|
if (fwnode_property_read_u32(fwnode, "intel,dma-poll-cnt",
|
|
&d->pollcnt))
|
|
d->pollcnt = DMA_DFT_POLL_CNT;
|
|
|
|
if (d->inst->chan_fc)
|
|
d->flags |= DMA_CHAN_FLOW_CTL;
|
|
|
|
if (d->inst->desc_fod)
|
|
d->flags |= DMA_DESC_FOD;
|
|
|
|
if (d->inst->desc_in_sram)
|
|
d->flags |= DMA_DESC_IN_SRAM;
|
|
|
|
if (d->inst->valid_desc_fetch_ack)
|
|
d->flags |= DMA_VALID_DESC_FETCH_ACK;
|
|
|
|
if (d->ver > DMA_VER22) {
|
|
if (!d->port_nrs)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < d->port_nrs; i++) {
|
|
p = &d->ports[i];
|
|
p->rxendi = DMA_DFT_ENDIAN;
|
|
p->txendi = DMA_DFT_ENDIAN;
|
|
p->rxbl = DMA_DFT_BURST;
|
|
p->txbl = DMA_DFT_BURST;
|
|
p->pkt_drop = DMA_PKT_DROP_DIS;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dma_free_desc_resource(struct virt_dma_desc *vdesc)
|
|
{
|
|
struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc);
|
|
struct ldma_chan *c = ds->chan;
|
|
|
|
dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys);
|
|
kfree(ds);
|
|
}
|
|
|
|
static struct dw2_desc_sw *
|
|
dma_alloc_desc_resource(int num, struct ldma_chan *c)
|
|
{
|
|
struct device *dev = c->vchan.chan.device->dev;
|
|
struct dw2_desc_sw *ds;
|
|
|
|
if (num > c->desc_num) {
|
|
dev_err(dev, "sg num %d exceed max %d\n", num, c->desc_num);
|
|
return NULL;
|
|
}
|
|
|
|
ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
|
|
if (!ds)
|
|
return NULL;
|
|
|
|
ds->chan = c;
|
|
ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC,
|
|
&ds->desc_phys);
|
|
if (!ds->desc_hw) {
|
|
dev_dbg(dev, "out of memory for link descriptor\n");
|
|
kfree(ds);
|
|
return NULL;
|
|
}
|
|
ds->desc_cnt = num;
|
|
|
|
return ds;
|
|
}
|
|
|
|
static void ldma_chan_irq_en(struct ldma_chan *c)
|
|
{
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&d->dev_lock, flags);
|
|
writel(c->nr, d->base + DMA_CS);
|
|
writel(DMA_CI_EOP, d->base + DMA_CIE);
|
|
writel(BIT(c->nr), d->base + DMA_IRNEN);
|
|
spin_unlock_irqrestore(&d->dev_lock, flags);
|
|
}
|
|
|
|
static void ldma_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
unsigned long flags;
|
|
|
|
if (d->ver == DMA_VER22) {
|
|
spin_lock_irqsave(&c->vchan.lock, flags);
|
|
if (vchan_issue_pending(&c->vchan)) {
|
|
struct virt_dma_desc *vdesc;
|
|
|
|
/* Get the next descriptor */
|
|
vdesc = vchan_next_desc(&c->vchan);
|
|
if (!vdesc) {
|
|
c->ds = NULL;
|
|
spin_unlock_irqrestore(&c->vchan.lock, flags);
|
|
return;
|
|
}
|
|
list_del(&vdesc->node);
|
|
c->ds = to_lgm_dma_desc(vdesc);
|
|
ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds->desc_cnt);
|
|
ldma_chan_irq_en(c);
|
|
}
|
|
spin_unlock_irqrestore(&c->vchan.lock, flags);
|
|
}
|
|
ldma_chan_on(c);
|
|
}
|
|
|
|
static void ldma_synchronize(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
|
|
/*
|
|
* clear any pending work if any. In that
|
|
* case the resource needs to be free here.
|
|
*/
|
|
cancel_work_sync(&c->work);
|
|
vchan_synchronize(&c->vchan);
|
|
if (c->ds)
|
|
dma_free_desc_resource(&c->ds->vdesc);
|
|
}
|
|
|
|
static int ldma_terminate_all(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
unsigned long flags;
|
|
LIST_HEAD(head);
|
|
|
|
spin_lock_irqsave(&c->vchan.lock, flags);
|
|
vchan_get_all_descriptors(&c->vchan, &head);
|
|
spin_unlock_irqrestore(&c->vchan.lock, flags);
|
|
vchan_dma_desc_free_list(&c->vchan, &head);
|
|
|
|
return ldma_chan_reset(c);
|
|
}
|
|
|
|
static int ldma_resume_chan(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
|
|
ldma_chan_on(c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ldma_pause_chan(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
|
|
return ldma_chan_off(c);
|
|
}
|
|
|
|
static enum dma_status
|
|
ldma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
enum dma_status status = DMA_COMPLETE;
|
|
|
|
if (d->ver == DMA_VER22)
|
|
status = dma_cookie_status(chan, cookie, txstate);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void dma_chan_irq(int irq, void *data)
|
|
{
|
|
struct ldma_chan *c = data;
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
u32 stat;
|
|
|
|
/* Disable channel interrupts */
|
|
writel(c->nr, d->base + DMA_CS);
|
|
stat = readl(d->base + DMA_CIS);
|
|
if (!stat)
|
|
return;
|
|
|
|
writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base + DMA_CIE);
|
|
writel(stat, d->base + DMA_CIS);
|
|
queue_work(d->wq, &c->work);
|
|
}
|
|
|
|
static irqreturn_t dma_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct ldma_dev *d = dev_id;
|
|
struct ldma_chan *c;
|
|
unsigned long irncr;
|
|
u32 cid;
|
|
|
|
irncr = readl(d->base + DMA_IRNCR);
|
|
if (!irncr) {
|
|
dev_err(d->dev, "dummy interrupt\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
for_each_set_bit(cid, &irncr, d->chan_nrs) {
|
|
/* Mask */
|
|
writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base + DMA_IRNEN);
|
|
/* Ack */
|
|
writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base + DMA_IRNCR);
|
|
|
|
c = &d->chans[cid];
|
|
dma_chan_irq(irq, c);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void prep_slave_burst_len(struct ldma_chan *c)
|
|
{
|
|
struct ldma_port *p = c->port;
|
|
struct dma_slave_config *cfg = &c->config;
|
|
|
|
if (cfg->dst_maxburst)
|
|
cfg->src_maxburst = cfg->dst_maxburst;
|
|
|
|
/* TX and RX has the same burst length */
|
|
p->txbl = ilog2(cfg->src_maxburst);
|
|
p->rxbl = p->txbl;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
ldma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
|
|
unsigned int sglen, enum dma_transfer_direction dir,
|
|
unsigned long flags, void *context)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
size_t len, avail, total = 0;
|
|
struct dw2_desc *hw_ds;
|
|
struct dw2_desc_sw *ds;
|
|
struct scatterlist *sg;
|
|
int num = sglen, i;
|
|
dma_addr_t addr;
|
|
|
|
if (!sgl)
|
|
return NULL;
|
|
|
|
if (d->ver > DMA_VER22)
|
|
return ldma_chan_desc_cfg(chan, sgl->dma_address, sglen);
|
|
|
|
for_each_sg(sgl, sg, sglen, i) {
|
|
avail = sg_dma_len(sg);
|
|
if (avail > DMA_MAX_SIZE)
|
|
num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
|
|
}
|
|
|
|
ds = dma_alloc_desc_resource(num, c);
|
|
if (!ds)
|
|
return NULL;
|
|
|
|
c->ds = ds;
|
|
|
|
num = 0;
|
|
/* sop and eop has to be handled nicely */
|
|
for_each_sg(sgl, sg, sglen, i) {
|
|
addr = sg_dma_address(sg);
|
|
avail = sg_dma_len(sg);
|
|
total += avail;
|
|
|
|
do {
|
|
len = min_t(size_t, avail, DMA_MAX_SIZE);
|
|
|
|
hw_ds = &ds->desc_hw[num];
|
|
switch (sglen) {
|
|
case 1:
|
|
hw_ds->field &= ~DESC_SOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_SOP, 1);
|
|
|
|
hw_ds->field &= ~DESC_EOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_EOP, 1);
|
|
break;
|
|
default:
|
|
if (num == 0) {
|
|
hw_ds->field &= ~DESC_SOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_SOP, 1);
|
|
|
|
hw_ds->field &= ~DESC_EOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_EOP, 0);
|
|
} else if (num == (sglen - 1)) {
|
|
hw_ds->field &= ~DESC_SOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_SOP, 0);
|
|
hw_ds->field &= ~DESC_EOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_EOP, 1);
|
|
} else {
|
|
hw_ds->field &= ~DESC_SOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_SOP, 0);
|
|
|
|
hw_ds->field &= ~DESC_EOP;
|
|
hw_ds->field |= FIELD_PREP(DESC_EOP, 0);
|
|
}
|
|
break;
|
|
}
|
|
/* Only 32 bit address supported */
|
|
hw_ds->addr = (u32)addr;
|
|
|
|
hw_ds->field &= ~DESC_DATA_LEN;
|
|
hw_ds->field |= FIELD_PREP(DESC_DATA_LEN, len);
|
|
|
|
hw_ds->field &= ~DESC_C;
|
|
hw_ds->field |= FIELD_PREP(DESC_C, 0);
|
|
|
|
hw_ds->field &= ~DESC_BYTE_OFF;
|
|
hw_ds->field |= FIELD_PREP(DESC_BYTE_OFF, addr & 0x3);
|
|
|
|
/* Ensure data ready before ownership change */
|
|
wmb();
|
|
hw_ds->field &= ~DESC_OWN;
|
|
hw_ds->field |= FIELD_PREP(DESC_OWN, DMA_OWN);
|
|
|
|
/* Ensure ownership changed before moving forward */
|
|
wmb();
|
|
num++;
|
|
addr += len;
|
|
avail -= len;
|
|
} while (avail);
|
|
}
|
|
|
|
ds->size = total;
|
|
prep_slave_burst_len(c);
|
|
|
|
return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK);
|
|
}
|
|
|
|
static int
|
|
ldma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
|
|
memcpy(&c->config, cfg, sizeof(c->config));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ldma_alloc_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
struct device *dev = c->vchan.chan.device->dev;
|
|
size_t desc_sz;
|
|
|
|
if (d->ver > DMA_VER22) {
|
|
c->flags |= CHAN_IN_USE;
|
|
return 0;
|
|
}
|
|
|
|
if (c->desc_pool)
|
|
return c->desc_num;
|
|
|
|
desc_sz = c->desc_num * sizeof(struct dw2_desc);
|
|
c->desc_pool = dma_pool_create(c->name, dev, desc_sz,
|
|
__alignof__(struct dw2_desc), 0);
|
|
|
|
if (!c->desc_pool) {
|
|
dev_err(dev, "unable to allocate descriptor pool\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return c->desc_num;
|
|
}
|
|
|
|
static void ldma_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct ldma_chan *c = to_ldma_chan(chan);
|
|
struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device);
|
|
|
|
if (d->ver == DMA_VER22) {
|
|
dma_pool_destroy(c->desc_pool);
|
|
c->desc_pool = NULL;
|
|
vchan_free_chan_resources(to_virt_chan(chan));
|
|
ldma_chan_reset(c);
|
|
} else {
|
|
c->flags &= ~CHAN_IN_USE;
|
|
}
|
|
}
|
|
|
|
static void dma_work(struct work_struct *work)
|
|
{
|
|
struct ldma_chan *c = container_of(work, struct ldma_chan, work);
|
|
struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx;
|
|
struct virt_dma_chan *vc = &c->vchan;
|
|
struct dmaengine_desc_callback cb;
|
|
struct virt_dma_desc *vd, *_vd;
|
|
unsigned long flags;
|
|
LIST_HEAD(head);
|
|
|
|
spin_lock_irqsave(&c->vchan.lock, flags);
|
|
list_splice_tail_init(&vc->desc_completed, &head);
|
|
spin_unlock_irqrestore(&c->vchan.lock, flags);
|
|
dmaengine_desc_get_callback(tx, &cb);
|
|
dma_cookie_complete(tx);
|
|
dmaengine_desc_callback_invoke(&cb, NULL);
|
|
|
|
list_for_each_entry_safe(vd, _vd, &head, node) {
|
|
dmaengine_desc_get_callback(tx, &cb);
|
|
dma_cookie_complete(tx);
|
|
list_del(&vd->node);
|
|
dmaengine_desc_callback_invoke(&cb, NULL);
|
|
|
|
vchan_vdesc_fini(vd);
|
|
}
|
|
c->ds = NULL;
|
|
}
|
|
|
|
static void
|
|
update_burst_len_v22(struct ldma_chan *c, struct ldma_port *p, u32 burst)
|
|
{
|
|
if (ldma_chan_tx(c))
|
|
p->txbl = ilog2(burst);
|
|
else
|
|
p->rxbl = ilog2(burst);
|
|
}
|
|
|
|
static void
|
|
update_burst_len_v3X(struct ldma_chan *c, struct ldma_port *p, u32 burst)
|
|
{
|
|
if (ldma_chan_tx(c))
|
|
p->txbl = burst;
|
|
else
|
|
p->rxbl = burst;
|
|
}
|
|
|
|
static int
|
|
update_client_configs(struct of_dma *ofdma, struct of_phandle_args *spec)
|
|
{
|
|
struct ldma_dev *d = ofdma->of_dma_data;
|
|
u32 chan_id = spec->args[0];
|
|
u32 port_id = spec->args[1];
|
|
u32 burst = spec->args[2];
|
|
struct ldma_port *p;
|
|
struct ldma_chan *c;
|
|
|
|
if (chan_id >= d->chan_nrs || port_id >= d->port_nrs)
|
|
return 0;
|
|
|
|
p = &d->ports[port_id];
|
|
c = &d->chans[chan_id];
|
|
c->port = p;
|
|
|
|
if (d->ver == DMA_VER22)
|
|
update_burst_len_v22(c, p, burst);
|
|
else
|
|
update_burst_len_v3X(c, p, burst);
|
|
|
|
ldma_port_cfg(p);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct dma_chan *ldma_xlate(struct of_phandle_args *spec,
|
|
struct of_dma *ofdma)
|
|
{
|
|
struct ldma_dev *d = ofdma->of_dma_data;
|
|
u32 chan_id = spec->args[0];
|
|
int ret;
|
|
|
|
if (!spec->args_count)
|
|
return NULL;
|
|
|
|
/* if args_count is 1 driver use default settings */
|
|
if (spec->args_count > 1) {
|
|
ret = update_client_configs(ofdma, spec);
|
|
if (!ret)
|
|
return NULL;
|
|
}
|
|
|
|
return dma_get_slave_channel(&d->chans[chan_id].vchan.chan);
|
|
}
|
|
|
|
static void ldma_dma_init_v22(int i, struct ldma_dev *d)
|
|
{
|
|
struct ldma_chan *c;
|
|
|
|
c = &d->chans[i];
|
|
c->nr = i; /* Real channel number */
|
|
c->rst = DMA_CHAN_RST;
|
|
c->desc_num = DMA_DFT_DESC_NUM;
|
|
snprintf(c->name, sizeof(c->name), "chan%d", c->nr);
|
|
INIT_WORK(&c->work, dma_work);
|
|
c->vchan.desc_free = dma_free_desc_resource;
|
|
vchan_init(&c->vchan, &d->dma_dev);
|
|
}
|
|
|
|
static void ldma_dma_init_v3X(int i, struct ldma_dev *d)
|
|
{
|
|
struct ldma_chan *c;
|
|
|
|
c = &d->chans[i];
|
|
c->data_endian = DMA_DFT_ENDIAN;
|
|
c->desc_endian = DMA_DFT_ENDIAN;
|
|
c->data_endian_en = false;
|
|
c->desc_endian_en = false;
|
|
c->desc_rx_np = false;
|
|
c->flags |= DEVICE_ALLOC_DESC;
|
|
c->onoff = DMA_CH_OFF;
|
|
c->rst = DMA_CHAN_RST;
|
|
c->abc_en = true;
|
|
c->hdrm_csum = false;
|
|
c->boff_len = 0;
|
|
c->nr = i;
|
|
c->vchan.desc_free = dma_free_desc_resource;
|
|
vchan_init(&c->vchan, &d->dma_dev);
|
|
}
|
|
|
|
static int ldma_init_v22(struct ldma_dev *d, struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_property_read_u32(d->dev, "dma-channels", &d->chan_nrs);
|
|
if (ret < 0) {
|
|
dev_err(d->dev, "unable to read dma-channels property\n");
|
|
return ret;
|
|
}
|
|
|
|
d->irq = platform_get_irq(pdev, 0);
|
|
if (d->irq < 0)
|
|
return d->irq;
|
|
|
|
ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, 0,
|
|
DRIVER_NAME, d);
|
|
if (ret)
|
|
return ret;
|
|
|
|
d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM |
|
|
WQ_HIGHPRI);
|
|
if (!d->wq)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ldma_clk_disable(void *data)
|
|
{
|
|
struct ldma_dev *d = data;
|
|
|
|
clk_disable_unprepare(d->core_clk);
|
|
reset_control_assert(d->rst);
|
|
}
|
|
|
|
static const struct ldma_inst_data dma0 = {
|
|
.name = "dma0",
|
|
.chan_fc = false,
|
|
.desc_fod = false,
|
|
.desc_in_sram = false,
|
|
.valid_desc_fetch_ack = false,
|
|
};
|
|
|
|
static const struct ldma_inst_data dma2tx = {
|
|
.name = "dma2tx",
|
|
.type = DMA_TYPE_TX,
|
|
.orrc = 16,
|
|
.chan_fc = true,
|
|
.desc_fod = true,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = true,
|
|
};
|
|
|
|
static const struct ldma_inst_data dma1rx = {
|
|
.name = "dma1rx",
|
|
.type = DMA_TYPE_RX,
|
|
.orrc = 16,
|
|
.chan_fc = false,
|
|
.desc_fod = true,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = false,
|
|
};
|
|
|
|
static const struct ldma_inst_data dma1tx = {
|
|
.name = "dma1tx",
|
|
.type = DMA_TYPE_TX,
|
|
.orrc = 16,
|
|
.chan_fc = true,
|
|
.desc_fod = true,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = true,
|
|
};
|
|
|
|
static const struct ldma_inst_data dma0tx = {
|
|
.name = "dma0tx",
|
|
.type = DMA_TYPE_TX,
|
|
.orrc = 16,
|
|
.chan_fc = true,
|
|
.desc_fod = true,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = true,
|
|
};
|
|
|
|
static const struct ldma_inst_data dma3 = {
|
|
.name = "dma3",
|
|
.type = DMA_TYPE_MCPY,
|
|
.orrc = 16,
|
|
.chan_fc = false,
|
|
.desc_fod = false,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = false,
|
|
};
|
|
|
|
static const struct ldma_inst_data toe_dma30 = {
|
|
.name = "toe_dma30",
|
|
.type = DMA_TYPE_MCPY,
|
|
.orrc = 16,
|
|
.chan_fc = false,
|
|
.desc_fod = false,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = true,
|
|
};
|
|
|
|
static const struct ldma_inst_data toe_dma31 = {
|
|
.name = "toe_dma31",
|
|
.type = DMA_TYPE_MCPY,
|
|
.orrc = 16,
|
|
.chan_fc = false,
|
|
.desc_fod = false,
|
|
.desc_in_sram = true,
|
|
.valid_desc_fetch_ack = true,
|
|
};
|
|
|
|
static const struct of_device_id intel_ldma_match[] = {
|
|
{ .compatible = "intel,lgm-cdma", .data = &dma0},
|
|
{ .compatible = "intel,lgm-dma2tx", .data = &dma2tx},
|
|
{ .compatible = "intel,lgm-dma1rx", .data = &dma1rx},
|
|
{ .compatible = "intel,lgm-dma1tx", .data = &dma1tx},
|
|
{ .compatible = "intel,lgm-dma0tx", .data = &dma0tx},
|
|
{ .compatible = "intel,lgm-dma3", .data = &dma3},
|
|
{ .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30},
|
|
{ .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31},
|
|
{}
|
|
};
|
|
|
|
static int intel_ldma_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct dma_device *dma_dev;
|
|
unsigned long ch_mask;
|
|
struct ldma_chan *c;
|
|
struct ldma_port *p;
|
|
struct ldma_dev *d;
|
|
u32 id, bitn = 32, j;
|
|
int i, ret;
|
|
|
|
d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
/* Link controller to platform device */
|
|
d->dev = &pdev->dev;
|
|
|
|
d->inst = device_get_match_data(dev);
|
|
if (!d->inst) {
|
|
dev_err(dev, "No device match found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
d->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(d->base))
|
|
return PTR_ERR(d->base);
|
|
|
|
/* Power up and reset the dma engine, some DMAs always on?? */
|
|
d->core_clk = devm_clk_get_optional(dev, NULL);
|
|
if (IS_ERR(d->core_clk))
|
|
return PTR_ERR(d->core_clk);
|
|
clk_prepare_enable(d->core_clk);
|
|
|
|
d->rst = devm_reset_control_get_optional(dev, NULL);
|
|
if (IS_ERR(d->rst))
|
|
return PTR_ERR(d->rst);
|
|
reset_control_deassert(d->rst);
|
|
|
|
ret = devm_add_action_or_reset(dev, ldma_clk_disable, d);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to devm_add_action_or_reset, %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
id = readl(d->base + DMA_ID);
|
|
d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id);
|
|
d->port_nrs = FIELD_GET(DMA_ID_PNR, id);
|
|
d->ver = FIELD_GET(DMA_ID_REV, id);
|
|
|
|
if (id & DMA_ID_AW_36B)
|
|
d->flags |= DMA_ADDR_36BIT;
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && (id & DMA_ID_AW_36B))
|
|
bitn = 36;
|
|
|
|
if (id & DMA_ID_DW_128B)
|
|
d->flags |= DMA_DATA_128BIT;
|
|
|
|
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn));
|
|
if (ret) {
|
|
dev_err(dev, "No usable DMA configuration\n");
|
|
return ret;
|
|
}
|
|
|
|
if (d->ver == DMA_VER22) {
|
|
ret = ldma_init_v22(d, pdev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = device_property_read_u32(dev, "dma-channel-mask", &d->channels_mask);
|
|
if (ret < 0)
|
|
d->channels_mask = GENMASK(d->chan_nrs - 1, 0);
|
|
|
|
dma_dev = &d->dma_dev;
|
|
|
|
dma_cap_zero(dma_dev->cap_mask);
|
|
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
|
|
|
|
/* Channel initializations */
|
|
INIT_LIST_HEAD(&dma_dev->channels);
|
|
|
|
/* Port Initializations */
|
|
d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p), GFP_KERNEL);
|
|
if (!d->ports)
|
|
return -ENOMEM;
|
|
|
|
/* Channels Initializations */
|
|
d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c), GFP_KERNEL);
|
|
if (!d->chans)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < d->port_nrs; i++) {
|
|
p = &d->ports[i];
|
|
p->portid = i;
|
|
p->ldev = d;
|
|
}
|
|
|
|
ret = ldma_cfg_init(d);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dma_dev->dev = &pdev->dev;
|
|
|
|
ch_mask = (unsigned long)d->channels_mask;
|
|
for_each_set_bit(j, &ch_mask, d->chan_nrs) {
|
|
if (d->ver == DMA_VER22)
|
|
ldma_dma_init_v22(j, d);
|
|
else
|
|
ldma_dma_init_v3X(j, d);
|
|
}
|
|
|
|
dma_dev->device_alloc_chan_resources = ldma_alloc_chan_resources;
|
|
dma_dev->device_free_chan_resources = ldma_free_chan_resources;
|
|
dma_dev->device_terminate_all = ldma_terminate_all;
|
|
dma_dev->device_issue_pending = ldma_issue_pending;
|
|
dma_dev->device_tx_status = ldma_tx_status;
|
|
dma_dev->device_resume = ldma_resume_chan;
|
|
dma_dev->device_pause = ldma_pause_chan;
|
|
dma_dev->device_prep_slave_sg = ldma_prep_slave_sg;
|
|
|
|
if (d->ver == DMA_VER22) {
|
|
dma_dev->device_config = ldma_slave_config;
|
|
dma_dev->device_synchronize = ldma_synchronize;
|
|
dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
|
|
dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
|
|
dma_dev->directions = BIT(DMA_MEM_TO_DEV) |
|
|
BIT(DMA_DEV_TO_MEM);
|
|
dma_dev->residue_granularity =
|
|
DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, d);
|
|
|
|
ldma_dev_init(d);
|
|
|
|
ret = dma_async_device_register(dma_dev);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to register slave DMA engine device\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate, d);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to register of DMA controller\n");
|
|
dma_async_device_unregister(dma_dev);
|
|
return ret;
|
|
}
|
|
|
|
dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d->ver,
|
|
d->port_nrs, d->chan_nrs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver intel_ldma_driver = {
|
|
.probe = intel_ldma_probe,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = intel_ldma_match,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* Perform this driver as device_initcall to make sure initialization happens
|
|
* before its DMA clients of some are platform specific and also to provide
|
|
* registered DMA channels and DMA capabilities to clients before their
|
|
* initialization.
|
|
*/
|
|
static int __init intel_ldma_init(void)
|
|
{
|
|
return platform_driver_register(&intel_ldma_driver);
|
|
}
|
|
|
|
device_initcall(intel_ldma_init);
|