Re: [PATCH v8 1/3] dmaengine: Add support for APM X-Gene SoC DMA engine driver
From: Rameshwar Sahu
Date: Mon Mar 23 2015 - 07:07:48 EST
Hi Vinod,
On Thu, Mar 19, 2015 at 1:47 PM, Rameshwar Sahu <rsahu@xxxxxxx> wrote:
> Hi Vinod,
>
> On Wed, Mar 18, 2015 at 7:17 PM, Rameshwar Prasad Sahu <rsahu@xxxxxxx> wrote:
>> This patch implements the APM X-Gene SoC DMA engine driver. The APM X-Gene
>> SoC DMA engine consists of 4 DMA channels for performing DMA operations.
>> These DMA operations include memory copy, scatter-gather memory copy,
>> raid5 xor, and raid6 p+q offloading.
>>
>> Signed-off-by: Rameshwar Prasad Sahu <rsahu@xxxxxxx>
>> Signed-off-by: Loc Ho <lho@xxxxxxx>
>> ---
>> drivers/dma/Kconfig | 8 +
>> drivers/dma/Makefile | 1 +
>> drivers/dma/xgene-dma.c | 2090 +++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 2099 insertions(+)
>> create mode 100755 drivers/dma/xgene-dma.c
>>
>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>> index a874b6e..a271346 100644
>> --- a/drivers/dma/Kconfig
>> +++ b/drivers/dma/Kconfig
>> @@ -425,6 +425,14 @@ config IMG_MDC_DMA
>> help
>> Enable support for the IMG multi-threaded DMA controller (MDC).
>>
>> +config XGENE_DMA
>> + tristate "APM X-Gene DMA support"
>> + select DMA_ENGINE
>> + select DMA_ENGINE_RAID
>> + select ASYNC_TX_ENABLE_CHANNEL_SWITCH
>> + help
>> + Enable support for the APM X-Gene SoC DMA engine.
>> +
>> config DMA_ENGINE
>> bool
>>
>> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
>> index f915f61..06c1576 100644
>> --- a/drivers/dma/Makefile
>> +++ b/drivers/dma/Makefile
>> @@ -51,3 +51,4 @@ obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o
>> obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o
>> obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o
>> obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o
>> +obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
>> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
>> new file mode 100755
>> index 0000000..2383528
>> --- /dev/null
>> +++ b/drivers/dma/xgene-dma.c
>> @@ -0,0 +1,2090 @@
>> +/*
>> + * Applied Micro X-Gene SoC DMA engine Driver
>> + *
>> + * Copyright (c) 2015, Applied Micro Circuits Corporation
>> + * Authors: Rameshwar Prasad Sahu <rsahu@xxxxxxx>
>> + * Loc Ho <lho@xxxxxxx>
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License as published by the
>> + * Free Software Foundation; either version 2 of the License, or (at your
>> + * option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
>> + *
>> + * NOTE: PM support is currently not available.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/dmaengine.h>
>> +#include <linux/dmapool.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +
>> +#include "dmaengine.h"
>> +
>> +/* X-Gene DMA ring csr registers and bit definations */
>> +#define XGENE_DMA_RING_CONFIG 0x04
>> +#define XGENE_DMA_RING_ENABLE BIT(31)
>> +#define XGENE_DMA_RING_ID 0x08
>> +#define XGENE_DMA_RING_ID_SETUP(v) ((v) | BIT(31))
>> +#define XGENE_DMA_RING_ID_BUF 0x0C
>> +#define XGENE_DMA_RING_ID_BUF_SETUP(v) (((v) << 9) | BIT(21))
>> +#define XGENE_DMA_RING_THRESLD0_SET1 0x30
>> +#define XGENE_DMA_RING_THRESLD0_SET1_VAL 0X64
>> +#define XGENE_DMA_RING_THRESLD1_SET1 0x34
>> +#define XGENE_DMA_RING_THRESLD1_SET1_VAL 0xC8
>> +#define XGENE_DMA_RING_HYSTERESIS 0x68
>> +#define XGENE_DMA_RING_HYSTERESIS_VAL 0xFFFFFFFF
>> +#define XGENE_DMA_RING_STATE 0x6C
>> +#define XGENE_DMA_RING_STATE_WR_BASE 0x70
>> +#define XGENE_DMA_RING_NE_INT_MODE 0x017C
>> +#define XGENE_DMA_RING_NE_INT_MODE_SET(m, v) \
>> + ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v)))
>> +#define XGENE_DMA_RING_NE_INT_MODE_RESET(m, v) \
>> + ((m) &= (~BIT(31 - (v))))
>> +#define XGENE_DMA_RING_CLKEN 0xC208
>> +#define XGENE_DMA_RING_SRST 0xC200
>> +#define XGENE_DMA_RING_MEM_RAM_SHUTDOWN 0xD070
>> +#define XGENE_DMA_RING_BLK_MEM_RDY 0xD074
>> +#define XGENE_DMA_RING_BLK_MEM_RDY_VAL 0xFFFFFFFF
>> +#define XGENE_DMA_RING_DESC_CNT(v) (((v) & 0x0001FFFE) >> 1)
>> +#define XGENE_DMA_RING_ID_GET(owner, num) (((owner) << 6) | (num))
>> +#define XGENE_DMA_RING_DST_ID(v) ((1 << 10) | (v))
>> +#define XGENE_DMA_RING_CMD_OFFSET 0x2C
>> +#define XGENE_DMA_RING_CMD_BASE_OFFSET(v) ((v) << 6)
>> +#define XGENE_DMA_RING_COHERENT_SET(m) \
>> + (((u32 *)(m))[2] |= BIT(4))
>> +#define XGENE_DMA_RING_ADDRL_SET(m, v) \
>> + (((u32 *)(m))[2] |= (((v) >> 8) << 5))
>> +#define XGENE_DMA_RING_ADDRH_SET(m, v) \
>> + (((u32 *)(m))[3] |= ((v) >> 35))
>> +#define XGENE_DMA_RING_ACCEPTLERR_SET(m) \
>> + (((u32 *)(m))[3] |= BIT(19))
>> +#define XGENE_DMA_RING_SIZE_SET(m, v) \
>> + (((u32 *)(m))[3] |= ((v) << 23))
>> +#define XGENE_DMA_RING_RECOMBBUF_SET(m) \
>> + (((u32 *)(m))[3] |= BIT(27))
>> +#define XGENE_DMA_RING_RECOMTIMEOUTL_SET(m) \
>> + (((u32 *)(m))[3] |= (0x7 << 28))
>> +#define XGENE_DMA_RING_RECOMTIMEOUTH_SET(m) \
>> + (((u32 *)(m))[4] |= 0x3)
>> +#define XGENE_DMA_RING_SELTHRSH_SET(m) \
>> + (((u32 *)(m))[4] |= BIT(3))
>> +#define XGENE_DMA_RING_TYPE_SET(m, v) \
>> + (((u32 *)(m))[4] |= ((v) << 19))
>> +
>> +/* X-Gene DMA device csr registers and bit definitions */
>> +#define XGENE_DMA_IPBRR 0x0
>> +#define XGENE_DMA_DEV_ID_RD(v) ((v) & 0x00000FFF)
>> +#define XGENE_DMA_BUS_ID_RD(v) (((v) >> 12) & 3)
>> +#define XGENE_DMA_REV_NO_RD(v) (((v) >> 14) & 3)
>> +#define XGENE_DMA_GCR 0x10
>> +#define XGENE_DMA_CH_SETUP(v) \
>> + ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF)
>> +#define XGENE_DMA_ENABLE(v) ((v) |= BIT(31))
>> +#define XGENE_DMA_DISABLE(v) ((v) &= ~BIT(31))
>> +#define XGENE_DMA_RAID6_CONT 0x14
>> +#define XGENE_DMA_RAID6_MULTI_CTRL(v) ((v) << 24)
>> +#define XGENE_DMA_INT 0x70
>> +#define XGENE_DMA_INT_MASK 0x74
>> +#define XGENE_DMA_INT_ALL_MASK 0xFFFFFFFF
>> +#define XGENE_DMA_INT_ALL_UNMASK 0x0
>> +#define XGENE_DMA_INT_MASK_SHIFT 0x14
>> +#define XGENE_DMA_RING_INT0_MASK 0x90A0
>> +#define XGENE_DMA_RING_INT1_MASK 0x90A8
>> +#define XGENE_DMA_RING_INT2_MASK 0x90B0
>> +#define XGENE_DMA_RING_INT3_MASK 0x90B8
>> +#define XGENE_DMA_RING_INT4_MASK 0x90C0
>> +#define XGENE_DMA_CFG_RING_WQ_ASSOC 0x90E0
>> +#define XGENE_DMA_ASSOC_RING_MNGR1 0xFFFFFFFF
>> +#define XGENE_DMA_MEM_RAM_SHUTDOWN 0xD070
>> +#define XGENE_DMA_BLK_MEM_RDY 0xD074
>> +#define XGENE_DMA_BLK_MEM_RDY_VAL 0xFFFFFFFF
>> +
>> +/* X-Gene SoC EFUSE csr register and bit defination */
>> +#define XGENE_SOC_JTAG1_SHADOW 0x18
>> +#define XGENE_DMA_PQ_DISABLE_MASK BIT(13)
>> +
>> +/* X-Gene DMA Descriptor format */
>> +#define XGENE_DMA_DESC_NV_BIT BIT_ULL(50)
>> +#define XGENE_DMA_DESC_IN_BIT BIT_ULL(55)
>> +#define XGENE_DMA_DESC_C_BIT BIT_ULL(63)
>> +#define XGENE_DMA_DESC_DR_BIT BIT_ULL(61)
>> +#define XGENE_DMA_DESC_ELERR_POS 46
>> +#define XGENE_DMA_DESC_RTYPE_POS 56
>> +#define XGENE_DMA_DESC_LERR_POS 60
>> +#define XGENE_DMA_DESC_FLYBY_POS 4
>> +#define XGENE_DMA_DESC_BUFLEN_POS 48
>> +#define XGENE_DMA_DESC_HOENQ_NUM_POS 48
>> +
>> +#define XGENE_DMA_DESC_NV_SET(m) \
>> + (((u64 *)(m))[0] |= XGENE_DMA_DESC_NV_BIT)
>> +#define XGENE_DMA_DESC_IN_SET(m) \
>> + (((u64 *)(m))[0] |= XGENE_DMA_DESC_IN_BIT)
>> +#define XGENE_DMA_DESC_RTYPE_SET(m, v) \
>> + (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_RTYPE_POS))
>> +#define XGENE_DMA_DESC_BUFADDR_SET(m, v) \
>> + (((u64 *)(m))[0] |= (v))
>> +#define XGENE_DMA_DESC_BUFLEN_SET(m, v) \
>> + (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_BUFLEN_POS))
>> +#define XGENE_DMA_DESC_C_SET(m) \
>> + (((u64 *)(m))[1] |= XGENE_DMA_DESC_C_BIT)
>> +#define XGENE_DMA_DESC_FLYBY_SET(m, v) \
>> + (((u64 *)(m))[2] |= ((v) << XGENE_DMA_DESC_FLYBY_POS))
>> +#define XGENE_DMA_DESC_MULTI_SET(m, v, i) \
>> + (((u64 *)(m))[2] |= ((u64)(v) << (((i) + 1) * 8)))
>> +#define XGENE_DMA_DESC_DR_SET(m) \
>> + (((u64 *)(m))[2] |= XGENE_DMA_DESC_DR_BIT)
>> +#define XGENE_DMA_DESC_DST_ADDR_SET(m, v) \
>> + (((u64 *)(m))[3] |= (v))
>> +#define XGENE_DMA_DESC_H0ENQ_NUM_SET(m, v) \
>> + (((u64 *)(m))[3] |= ((u64)(v) << XGENE_DMA_DESC_HOENQ_NUM_POS))
>> +#define XGENE_DMA_DESC_ELERR_RD(m) \
>> + (((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3)
>> +#define XGENE_DMA_DESC_LERR_RD(m) \
>> + (((m) >> XGENE_DMA_DESC_LERR_POS) & 0x7)
>> +#define XGENE_DMA_DESC_STATUS(elerr, lerr) \
>> + (((elerr) << 4) | (lerr))
>> +
>> +/* X-Gene DMA descriptor empty s/w signature */
>> +#define XGENE_DMA_DESC_EMPTY_INDEX 0
>> +#define XGENE_DMA_DESC_EMPTY_SIGNATURE ~0ULL
>> +#define XGENE_DMA_DESC_SET_EMPTY(m) \
>> + (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] = \
>> + XGENE_DMA_DESC_EMPTY_SIGNATURE)
>> +#define XGENE_DMA_DESC_IS_EMPTY(m) \
>> + (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] == \
>> + XGENE_DMA_DESC_EMPTY_SIGNATURE)
>> +
>> +/* X-Gene DMA configurable parameters defines */
>> +#define XGENE_DMA_RING_NUM 512
>> +#define XGENE_DMA_BUFNUM 0x0
>> +#define XGENE_DMA_CPU_BUFNUM 0x18
>> +#define XGENE_DMA_RING_OWNER_DMA 0x03
>> +#define XGENE_DMA_RING_OWNER_CPU 0x0F
>> +#define XGENE_DMA_RING_TYPE_REGULAR 0x01
>> +#define XGENE_DMA_RING_WQ_DESC_SIZE 32 /* 32 Bytes */
>> +#define XGENE_DMA_RING_NUM_CONFIG 5
>> +#define XGENE_DMA_MAX_CHANNEL 4
>> +#define XGENE_DMA_XOR_CHANNEL 0
>> +#define XGENE_DMA_PQ_CHANNEL 1
>> +#define XGENE_DMA_MAX_BYTE_CNT 0x4000 /* 16 KB */
>> +#define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */
>> +#define XGENE_DMA_XOR_ALIGNMENT 6 /* 64 Bytes */
>> +#define XGENE_DMA_MAX_XOR_SRC 5
>> +#define XGENE_DMA_16K_BUFFER_LEN_CODE 0x0
>> +#define XGENE_DMA_INVALID_LEN_CODE 0x7800
>> +
>> +/* X-Gene DMA descriptor error codes */
>> +#define ERR_DESC_AXI 0x01
>> +#define ERR_BAD_DESC 0x02
>> +#define ERR_READ_DATA_AXI 0x03
>> +#define ERR_WRITE_DATA_AXI 0x04
>> +#define ERR_FBP_TIMEOUT 0x05
>> +#define ERR_ECC 0x06
>> +#define ERR_DIFF_SIZE 0x08
>> +#define ERR_SCT_GAT_LEN 0x09
>> +#define ERR_CRC_ERR 0x11
>> +#define ERR_CHKSUM 0x12
>> +#define ERR_DIF 0x13
>> +
>> +/* X-Gene DMA error interrupt codes */
>> +#define ERR_DIF_SIZE_INT 0x0
>> +#define ERR_GS_ERR_INT 0x1
>> +#define ERR_FPB_TIMEO_INT 0x2
>> +#define ERR_WFIFO_OVF_INT 0x3
>> +#define ERR_RFIFO_OVF_INT 0x4
>> +#define ERR_WR_TIMEO_INT 0x5
>> +#define ERR_RD_TIMEO_INT 0x6
>> +#define ERR_WR_ERR_INT 0x7
>> +#define ERR_RD_ERR_INT 0x8
>> +#define ERR_BAD_DESC_INT 0x9
>> +#define ERR_DESC_DST_INT 0xA
>> +#define ERR_DESC_SRC_INT 0xB
>> +
>> +/* X-Gene DMA flyby operation code */
>> +#define FLYBY_2SRC_XOR 0x8
>> +#define FLYBY_3SRC_XOR 0x9
>> +#define FLYBY_4SRC_XOR 0xA
>> +#define FLYBY_5SRC_XOR 0xB
>> +
>> +/* X-Gene DMA SW descriptor flags */
>> +#define XGENE_DMA_FLAG_64B_DESC BIT(0)
>> +
>> +/* Define to dump X-Gene DMA descriptor */
>> +#define XGENE_DMA_DESC_DUMP(desc, m) \
>> + print_hex_dump(KERN_ERR, (m), \
>> + DUMP_PREFIX_ADDRESS, 16, 8, (desc), 32, 0)
>> +
>> +#define to_dma_desc_sw(tx) \
>> + container_of(tx, struct xgene_dma_desc_sw, tx)
>> +#define to_dma_chan(dchan) \
>> + container_of(dchan, struct xgene_dma_chan, dma_chan)
>> +
>> +#define chan_dbg(chan, fmt, arg...) \
>> + dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)
>> +#define chan_err(chan, fmt, arg...) \
>> + dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)
>> +
>> +struct xgene_dma_desc_hw {
>> + u64 m0;
>> + u64 m1;
>> + u64 m2;
>> + u64 m3;
>> +};
>> +
>> +enum xgene_dma_ring_cfgsize {
>> + XGENE_DMA_RING_CFG_SIZE_512B,
>> + XGENE_DMA_RING_CFG_SIZE_2KB,
>> + XGENE_DMA_RING_CFG_SIZE_16KB,
>> + XGENE_DMA_RING_CFG_SIZE_64KB,
>> + XGENE_DMA_RING_CFG_SIZE_512KB,
>> + XGENE_DMA_RING_CFG_SIZE_INVALID
>> +};
>> +
>> +struct xgene_dma_ring {
>> + struct xgene_dma *pdma;
>> + u8 buf_num;
>> + u16 id;
>> + u16 num;
>> + u16 head;
>> + u16 owner;
>> + u16 slots;
>> + u16 dst_ring_num;
>> + u32 size;
>> + void __iomem *cmd;
>> + void __iomem *cmd_base;
>> + dma_addr_t desc_paddr;
>> + u32 state[XGENE_DMA_RING_NUM_CONFIG];
>> + enum xgene_dma_ring_cfgsize cfgsize;
>> + union {
>> + void *desc_vaddr;
>> + struct xgene_dma_desc_hw *desc_hw;
>> + };
>> +};
>> +
>> +struct xgene_dma_desc_sw {
>> + struct xgene_dma_desc_hw desc1;
>> + struct xgene_dma_desc_hw desc2;
>> + u32 flags;
>> + struct list_head node;
>> + struct list_head tx_list;
>> + struct dma_async_tx_descriptor tx;
>> +};
>> +
>> +/**
>> + * struct xgene_dma_chan - internal representation of an X-Gene DMA channel
>> + * @dma_chan: dmaengine channel object member
>> + * @pdma: X-Gene DMA device structure reference
>> + * @dev: struct device reference for dma mapping api
>> + * @id: raw id of this channel
>> + * @rx_irq: channel IRQ
>> + * @name: name of X-Gene DMA channel
>> + * @lock: serializes enqueue/dequeue operations to the descriptor pool
>> + * @pending: number of transaction request pushed to DMA controller for
>> + * execution, but still waiting for completion,
>> + * @max_outstanding: max number of outstanding request we can push to channel
>> + * @ld_pending: descriptors which are queued to run, but have not yet been
>> + * submitted to the hardware for execution
>> + * @ld_running: descriptors which are currently being executing by the hardware
>> + * @ld_completed: descriptors which have finished execution by the hardware.
>> + * These descriptors have already had their cleanup actions run. They
>> + * are waiting for the ACK bit to be set by the async tx API.
>> + * @desc_pool: descriptor pool for DMA operations
>> + * @tasklet: bottom half where all completed descriptors cleans
>> + * @tx_ring: transmit ring descriptor that we use to prepare actual
>> + * descriptors for further executions
>> + * @rx_ring: receive ring descriptor that we use to get completed DMA
>> + * descriptors during cleanup time
>> + */
>> +struct xgene_dma_chan {
>> + struct dma_chan dma_chan;
>> + struct xgene_dma *pdma;
>> + struct device *dev;
>> + int id;
>> + int rx_irq;
>> + char name[8];
>> + spinlock_t lock;
>> + int pending;
>> + int max_outstanding;
>> + struct list_head ld_pending;
>> + struct list_head ld_running;
>> + struct list_head ld_completed;
>> + struct dma_pool *desc_pool;
>> + struct tasklet_struct tasklet;
>> + struct xgene_dma_ring tx_ring;
>> + struct xgene_dma_ring rx_ring;
>> +};
>> +
>> +/**
>> + * struct xgene_dma - internal representation of an X-Gene DMA device
>> + * @err_irq: DMA error irq number
>> + * @ring_num: start id number for DMA ring
>> + * @csr_dma: base for DMA register access
>> + * @csr_ring: base for DMA ring register access
>> + * @csr_ring_cmd: base for DMA ring command register access
>> + * @csr_efuse: base for efuse register access
>> + * @dma_dev: embedded struct dma_device
>> + * @chan: reference to X-Gene DMA channels
>> + */
>> +struct xgene_dma {
>> + struct device *dev;
>> + struct clk *clk;
>> + int err_irq;
>> + int ring_num;
>> + void __iomem *csr_dma;
>> + void __iomem *csr_ring;
>> + void __iomem *csr_ring_cmd;
>> + void __iomem *csr_efuse;
>> + struct dma_device dma_dev[XGENE_DMA_MAX_CHANNEL];
>> + struct xgene_dma_chan chan[XGENE_DMA_MAX_CHANNEL];
>> +};
>> +
>> +static const char * const xgene_dma_desc_err[] = {
>> + [ERR_DESC_AXI] = "AXI error when reading src/dst link list",
>> + [ERR_BAD_DESC] = "ERR or El_ERR fields not set to zero in desc",
>> + [ERR_READ_DATA_AXI] = "AXI error when reading data",
>> + [ERR_WRITE_DATA_AXI] = "AXI error when writing data",
>> + [ERR_FBP_TIMEOUT] = "Timeout on bufpool fetch",
>> + [ERR_ECC] = "ECC double bit error",
>> + [ERR_DIFF_SIZE] = "Bufpool too small to hold all the DIF result",
>> + [ERR_SCT_GAT_LEN] = "Gather and scatter data length not same",
>> + [ERR_CRC_ERR] = "CRC error",
>> + [ERR_CHKSUM] = "Checksum error",
>> + [ERR_DIF] = "DIF error",
>> +};
>> +
>> +static const char * const xgene_dma_err[] = {
>> + [ERR_DIF_SIZE_INT] = "DIF size error",
>> + [ERR_GS_ERR_INT] = "Gather scatter not same size error",
>> + [ERR_FPB_TIMEO_INT] = "Free pool time out error",
>> + [ERR_WFIFO_OVF_INT] = "Write FIFO over flow error",
>> + [ERR_RFIFO_OVF_INT] = "Read FIFO over flow error",
>> + [ERR_WR_TIMEO_INT] = "Write time out error",
>> + [ERR_RD_TIMEO_INT] = "Read time out error",
>> + [ERR_WR_ERR_INT] = "HBF bus write error",
>> + [ERR_RD_ERR_INT] = "HBF bus read error",
>> + [ERR_BAD_DESC_INT] = "Ring descriptor HE0 not set error",
>> + [ERR_DESC_DST_INT] = "HFB reading dst link address error",
>> + [ERR_DESC_SRC_INT] = "HFB reading src link address error",
>> +};
>> +
>> +static bool is_pq_enabled(struct xgene_dma *pdma)
>> +{
>> + u32 val;
>> +
>> + val = ioread32(pdma->csr_efuse + XGENE_SOC_JTAG1_SHADOW);
>> + return !(val & XGENE_DMA_PQ_DISABLE_MASK);
>> +}
>> +
>> +static void xgene_dma_cpu_to_le64(u64 *desc, int count)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < count; i++)
>> + desc[i] = cpu_to_le64(desc[i]);
>> +}
>> +
>> +static u16 xgene_dma_encode_len(u32 len)
>> +{
>> + return (len < XGENE_DMA_MAX_BYTE_CNT) ?
>> + len : XGENE_DMA_16K_BUFFER_LEN_CODE;
>> +}
>> +
>> +static u8 xgene_dma_encode_xor_flyby(u32 src_cnt)
>> +{
>> + static u8 flyby_type[] = {
>> + FLYBY_2SRC_XOR, /* Dummy */
>> + FLYBY_2SRC_XOR, /* Dummy */
>> + FLYBY_2SRC_XOR,
>> + FLYBY_3SRC_XOR,
>> + FLYBY_4SRC_XOR,
>> + FLYBY_5SRC_XOR
>> + };
>> +
>> + return flyby_type[src_cnt];
>> +}
>> +
>> +static u32 xgene_dma_ring_desc_cnt(struct xgene_dma_ring *ring)
>> +{
>> + u32 __iomem *cmd_base = ring->cmd_base;
>> + u32 ring_state = ioread32(&cmd_base[1]);
>> +
>> + return XGENE_DMA_RING_DESC_CNT(ring_state);
>> +}
>> +
>> +static void xgene_dma_set_src_buffer(void *ext8, size_t *len,
>> + dma_addr_t *paddr)
>> +{
>> + size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ?
>> + *len : XGENE_DMA_MAX_BYTE_CNT;
>> +
>> + XGENE_DMA_DESC_BUFADDR_SET(ext8, *paddr);
>> + XGENE_DMA_DESC_BUFLEN_SET(ext8, xgene_dma_encode_len(nbytes));
>> + *len -= nbytes;
>> + *paddr += nbytes;
>> +}
>> +
>> +static void xgene_dma_invalidate_buffer(void *ext8)
>> +{
>> + XGENE_DMA_DESC_BUFLEN_SET(ext8, XGENE_DMA_INVALID_LEN_CODE);
>> +}
>> +
>> +static void *xgene_dma_lookup_ext8(u64 *desc, int idx)
>> +{
>> + return (idx % 2) ? (desc + idx - 1) : (desc + idx + 1);
>> +}
>> +
>> +static void xgene_dma_init_desc(void *desc, u16 dst_ring_num)
>> +{
>> + XGENE_DMA_DESC_C_SET(desc); /* Coherent IO */
>> + XGENE_DMA_DESC_IN_SET(desc);
>> + XGENE_DMA_DESC_H0ENQ_NUM_SET(desc, dst_ring_num);
>> + XGENE_DMA_DESC_RTYPE_SET(desc, XGENE_DMA_RING_OWNER_DMA);
>> +}
>> +
>> +static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan,
>> + struct xgene_dma_desc_sw *desc_sw,
>> + dma_addr_t dst, dma_addr_t src,
>> + size_t len)
>> +{
>> + void *desc1, *desc2;
>> + int i;
>> +
>> + /* Get 1st descriptor */
>> + desc1 = &desc_sw->desc1;
>> + xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
>> +
>> + /* Set destination address */
>> + XGENE_DMA_DESC_DR_SET(desc1);
>> + XGENE_DMA_DESC_DST_ADDR_SET(desc1, dst);
>> +
>> + /* Set 1st source address */
>> + xgene_dma_set_src_buffer(desc1 + 8, &len, &src);
>> +
>> + if (len <= 0) {
>> + desc2 = NULL;
>> + goto skip_additional_src;
>> + }
>> +
>> + /*
>> + * We need to split this source buffer,
>> + * and need to use 2nd descriptor
>> + */
>> + desc2 = &desc_sw->desc2;
>> + XGENE_DMA_DESC_NV_SET(desc1);
>> +
>> + /* Set 2nd to 5th source address */
>> + for (i = 0; i < 4 && len; i++)
>> + xgene_dma_set_src_buffer(xgene_dma_lookup_ext8(desc2, i),
>> + &len, &src);
>> +
>> + /* Invalidate unused source address field */
>> + for (; i < 4; i++)
>> + xgene_dma_invalidate_buffer(xgene_dma_lookup_ext8(desc2, i));
>> +
>> + /* Updated flag that we have prepared 64B descriptor */
>> + desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
>> +
>> +skip_additional_src:
>> + /* Hardware stores descriptor in little endian format */
>> + xgene_dma_cpu_to_le64(desc1, 4);
>> + if (desc2)
>> + xgene_dma_cpu_to_le64(desc2, 4);
>> +}
>> +
>> +static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan,
>> + struct xgene_dma_desc_sw *desc_sw,
>> + dma_addr_t *dst, dma_addr_t *src,
>> + u32 src_cnt, size_t *nbytes,
>> + const u8 *scf)
>> +{
>> + void *desc1, *desc2;
>> + size_t len = *nbytes;
>> + int i;
>> +
>> + desc1 = &desc_sw->desc1;
>> + desc2 = &desc_sw->desc2;
>> +
>> + /* Initialize DMA descriptor */
>> + xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
>> +
>> + /* Set destination address */
>> + XGENE_DMA_DESC_DR_SET(desc1);
>> + XGENE_DMA_DESC_DST_ADDR_SET(desc1, *dst);
>> +
>> + /* We have multiple source addresses, so need to set NV bit*/
>> + XGENE_DMA_DESC_NV_SET(desc1);
>> +
>> + /* Set flyby opcode */
>> + XGENE_DMA_DESC_FLYBY_SET(desc1, xgene_dma_encode_xor_flyby(src_cnt));
>> +
>> + /* Set 1st to 5th source addresses */
>> + for (i = 0; i < src_cnt; i++) {
>> + len = *nbytes;
>> + xgene_dma_set_src_buffer((i == 0) ? (desc1 + 8) :
>> + xgene_dma_lookup_ext8(desc2, i - 1),
>> + &len, &src[i]);
>> + XGENE_DMA_DESC_MULTI_SET(desc1, scf[i], i);
>> + }
>> +
>> + /* Hardware stores descriptor in little endian format */
>> + xgene_dma_cpu_to_le64(desc1, 4);
>> + xgene_dma_cpu_to_le64(desc2, 4);
>> +
>> + /* Update meta data */
>> + *nbytes = len;
>> + *dst += XGENE_DMA_MAX_BYTE_CNT;
>> +
>> + /* We need always 64B descriptor to perform xor or pq operations */
>> + desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
>> +}
>> +
>> +static dma_cookie_t xgene_dma_tx_submit(struct dma_async_tx_descriptor *tx)
>> +{
>> + struct xgene_dma_desc_sw *desc;
>> + struct xgene_dma_chan *chan;
>> + dma_cookie_t cookie;
>> +
>> + if (unlikely(!tx))
>> + return -EINVAL;
>> +
>> + chan = to_dma_chan(tx->chan);
>> + desc = to_dma_desc_sw(tx);
>> +
>> + spin_lock_bh(&chan->lock);
>> +
>> + cookie = dma_cookie_assign(tx);
>> +
>> + /* Add this transaction list onto the tail of the pending queue */
>> + list_splice_tail_init(&desc->tx_list, &chan->ld_pending);
>> +
>> + spin_unlock_bh(&chan->lock);
>> +
>> + return cookie;
>> +}
>> +
>> +static void xgene_dma_clean_descriptor(struct xgene_dma_chan *chan,
>> + struct xgene_dma_desc_sw *desc)
>> +{
>> + list_del(&desc->node);
>> + chan_dbg(chan, "LD %p free\n", desc);
>> + dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
>> +}
>> +
>> +static struct xgene_dma_desc_sw *xgene_dma_alloc_descriptor(
>> + struct xgene_dma_chan *chan)
>> +{
>> + struct xgene_dma_desc_sw *desc;
>> + dma_addr_t phys;
>> +
>> + desc = dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, &phys);
>> + if (!desc) {
>> + chan_err(chan, "Failed to allocate LDs\n");
>> + return NULL;
>> + }
>> +
>> + memset(desc, 0, sizeof(*desc));
>> +
>> + INIT_LIST_HEAD(&desc->tx_list);
>> + desc->tx.phys = phys;
>> + desc->tx.tx_submit = xgene_dma_tx_submit;
>> + dma_async_tx_descriptor_init(&desc->tx, &chan->dma_chan);
>> +
>> + chan_dbg(chan, "LD %p allocated\n", desc);
>> +
>> + return desc;
>> +}
>> +
>> +/**
>> + * xgene_dma_clean_completed_descriptor - free all descriptors which
>> + * has been completed and acked
>> + * @chan: X-Gene DMA channel
>> + *
>> + * This function is used on all completed and acked descriptors.
>> + */
>> +static void xgene_dma_clean_completed_descriptor(struct xgene_dma_chan *chan)
>> +{
>> + struct xgene_dma_desc_sw *desc, *_desc;
>> +
>> + /* Run the callback for each descriptor, in order */
>> + list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) {
>> + if (async_tx_test_ack(&desc->tx))
>> + xgene_dma_clean_descriptor(chan, desc);
>> + }
>> +}
>> +
>> +/**
>> + * xgene_dma_run_tx_complete_actions - cleanup a single link descriptor
>> + * @chan: X-Gene DMA channel
>> + * @desc: descriptor to cleanup and free
>> + *
>> + * This function is used on a descriptor which has been executed by the DMA
>> + * controller. It will run any callbacks, submit any dependencies.
>> + */
>> +static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan,
>> + struct xgene_dma_desc_sw *desc)
>> +{
>> + struct dma_async_tx_descriptor *tx = &desc->tx;
>> +
>> + /*
>> + * If this is not the last transaction in the group,
>> + * then no need to complete cookie and run any callback as
>> + * this is not the tx_descriptor which had been sent to caller
>> + * of this DMA request
>> + */
>> +
>> + if (tx->cookie == 0)
>> + return;
>> +
>> + dma_cookie_complete(tx);
>> +
>> + /* Run the link descriptor callback function */
>> + if (tx->callback)
>> + tx->callback(tx->callback_param);
>> +
>> + dma_descriptor_unmap(tx);
>> +
>> + /* Run any dependencies */
>> + dma_run_dependencies(tx);
>> +}
>> +
>> +/**
>> + * xgene_dma_clean_running_descriptor - move the completed descriptor from
>> + * ld_running to ld_completed
>> + * @chan: X-Gene DMA channel
>> + * @desc: the descriptor which is completed
>> + *
>> + * Free the descriptor directly if acked by async_tx api,
>> + * else move it to queue ld_completed.
>> + */
>> +static void xgene_dma_clean_running_descriptor(struct xgene_dma_chan *chan,
>> + struct xgene_dma_desc_sw *desc)
>> +{
>> + /* Remove from the list of running transactions */
>> + list_del(&desc->node);
>> +
>> + /*
>> + * the client is allowed to attach dependent operations
>> + * until 'ack' is set
>> + */
>> + if (!async_tx_test_ack(&desc->tx)) {
>> + /*
>> + * Move this descriptor to the list of descriptors which is
>> + * completed, but still awaiting the 'ack' bit to be set.
>> + */
>> + list_add_tail(&desc->node, &chan->ld_completed);
>> + return;
>> + }
>> +
>> + chan_dbg(chan, "LD %p free\n", desc);
>> + dma_pool_free(chan->desc_pool, desc, desc->tx.phys);
>> +}
>> +
>> +static int xgene_chan_xfer_request(struct xgene_dma_ring *ring,
>> + struct xgene_dma_desc_sw *desc_sw)
>> +{
>> + struct xgene_dma_desc_hw *desc_hw;
>> +
>> + /* Check if can push more descriptor to hw for execution */
>> + if (xgene_dma_ring_desc_cnt(ring) > (ring->slots - 2))
>> + return -EBUSY;
>> +
>> + /* Get hw descriptor from DMA tx ring */
>> + desc_hw = &ring->desc_hw[ring->head];
>> +
>> + /*
>> + * Increment the head count to point next
>> + * descriptor for next time
>> + */
>> + if (++ring->head == ring->slots)
>> + ring->head = 0;
>> +
>> + /* Copy prepared sw descriptor data to hw descriptor */
>> + memcpy(desc_hw, &desc_sw->desc1, sizeof(*desc_hw));
>> +
>> + /*
>> + * Check if we have prepared 64B descriptor,
>> + * in this case we need one more hw descriptor
>> + */
>> + if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) {
>> + desc_hw = &ring->desc_hw[ring->head];
>> +
>> + if (++ring->head == ring->slots)
>> + ring->head = 0;
>> +
>> + memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw));
>> + }
>> +
>> + /* Notify the hw that we have descriptor ready for execution */
>> + iowrite32((desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) ?
>> + 2 : 1, ring->cmd);
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * xgene_chan_xfer_ld_pending - push any pending transactions to hw
>> + * @chan : X-Gene DMA channel
>> + *
>> + * LOCKING: must hold chan->desc_lock
>> + */
>> +static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan)
>> +{
>> + struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
>> + int ret;
>> +
>> + /*
>> + * If the list of pending descriptors is empty, then we
>> + * don't need to do any work at all
>> + */
>> + if (list_empty(&chan->ld_pending)) {
>> + chan_dbg(chan, "No pending LDs\n");
>> + return;
>> + }
>> +
>> + /*
>> + * Move elements from the queue of pending transactions onto the list
>> + * of running transactions and push it to hw for further executions
>> + */
>> + list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_pending, node) {
>> + /*
>> + * Check if have pushed max number of transactions to hw
>> + * as capable, so let's stop here and will push remaining
>> + * elements from pening ld queue after completing some
>> + * descriptors that we have already pushed
>> + */
>> + if (chan->pending >= chan->max_outstanding)
>> + return;
>> +
>> + ret = xgene_chan_xfer_request(&chan->tx_ring, desc_sw);
>> + if (ret)
>> + return;
>> +
>> + /*
>> + * Delete this element from ld pending queue and append it to
>> + * ld running queue
>> + */
>> + list_move_tail(&desc_sw->node, &chan->ld_running);
>> +
>> + /* Increment the pending transaction count */
>> + chan->pending++;
>> + }
>> +}
>> +
>> +/**
>> + * xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed
>> + * and move them to ld_completed to free until flag 'ack' is set
>> + * @chan: X-Gene DMA channel
>> + *
>> + * This function is used on descriptors which have been executed by the DMA
>> + * controller. It will run any callbacks, submit any dependencies, then
>> + * free these descriptors if flag 'ack' is set.
>> + */
>> +static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
>> +{
>> + struct xgene_dma_ring *ring = &chan->rx_ring;
>> + struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
>> + struct xgene_dma_desc_hw *desc_hw;
>> + u8 status;
>> +
>> + /* Clean already completed and acked descriptors */
>> + xgene_dma_clean_completed_descriptor(chan);
>> +
>> + /* Run the callback for each descriptor, in order */
>> + list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
>> + /* Get subsequent hw descriptor from DMA rx ring */
>> + desc_hw = &ring->desc_hw[ring->head];
>> +
>> + /* Check if this descriptor has been completed */
>> + if (unlikely(XGENE_DMA_DESC_IS_EMPTY(desc_hw)))
>> + break;
>> +
>> + if (++ring->head == ring->slots)
>> + ring->head = 0;
>> +
>> + /* Check if we have any error with DMA transactions */
>> + status = XGENE_DMA_DESC_STATUS(
>> + XGENE_DMA_DESC_ELERR_RD(le64_to_cpu(
>> + desc_hw->m0)),
>> + XGENE_DMA_DESC_LERR_RD(le64_to_cpu(
>> + desc_hw->m0)));
>> + if (status) {
>> + /* Print the DMA error type */
>> + chan_err(chan, "%s\n", xgene_dma_desc_err[status]);
>> +
>> + /*
>> + * We have DMA transactions error here. Dump DMA Tx
>> + * and Rx descriptors for this request */
>> + XGENE_DMA_DESC_DUMP(&desc_sw->desc1,
>> + "X-Gene DMA TX DESC1: ");
>> +
>> + if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC)
>> + XGENE_DMA_DESC_DUMP(&desc_sw->desc2,
>> + "X-Gene DMA TX DESC2: ");
>> +
>> + XGENE_DMA_DESC_DUMP(desc_hw,
>> + "X-Gene DMA RX ERR DESC: ");
>> + }
>> +
>> + /* Notify the hw about this completed descriptor */
>> + iowrite32(-1, ring->cmd);
>> +
>> + /* Mark this hw descriptor as processed */
>> + XGENE_DMA_DESC_SET_EMPTY(desc_hw);
>> +
>> + xgene_dma_run_tx_complete_actions(chan, desc_sw);
>> +
>> + xgene_dma_clean_running_descriptor(chan, desc_sw);
>> +
>> + /*
>> + * Decrement the pending transaction count
>> + * as we have processed one
>> + */
>> + chan->pending--;
>> + }
>> +
>> + /*
>> + * Start any pending transactions automatically
>> + * In the ideal case, we keep the DMA controller busy while we go
>> + * ahead and free the descriptors below.
>> + */
>> + xgene_chan_xfer_ld_pending(chan);
>> +}
>> +
>> +static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
>> +{
>> + struct xgene_dma_chan *chan = to_dma_chan(dchan);
>> +
>> + /* Has this channel already been allocated? */
>> + if (chan->desc_pool)
>> + return 1;
>> +
>> + chan->desc_pool = dma_pool_create(chan->name, chan->dev,
>> + sizeof(struct xgene_dma_desc_sw),
>> + 0, 0);
>> + if (!chan->desc_pool) {
>> + chan_err(chan, "Failed to allocate descriptor pool\n");
>> + return -ENOMEM;
>> + }
>> +
>> + chan_dbg(chan, "Allocate descripto pool\n");
>> +
>> + return 1;
>> +}
>> +
>> +/**
>> + * xgene_dma_free_desc_list - Free all descriptors in a queue
>> + * @chan: X-Gene DMA channel
>> + * @list: the list to free
>> + *
>> + * LOCKING: must hold chan->desc_lock
>> + */
>> +static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan,
>> + struct list_head *list)
>> +{
>> + struct xgene_dma_desc_sw *desc, *_desc;
>> +
>> + list_for_each_entry_safe(desc, _desc, list, node)
>> + xgene_dma_clean_descriptor(chan, desc);
>> +}
>> +
>> +static void xgene_dma_free_tx_desc_list(struct xgene_dma_chan *chan,
>> + struct list_head *list)
>> +{
>> + struct xgene_dma_desc_sw *desc, *_desc;
>> +
>> + list_for_each_entry_safe(desc, _desc, list, node)
>> + xgene_dma_clean_descriptor(chan, desc);
>> +}
>> +
>> +static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
>> +{
>> + struct xgene_dma_chan *chan = to_dma_chan(dchan);
>> +
>> + chan_dbg(chan, "Free all resources\n");
>> +
>> + if (!chan->desc_pool)
>> + return;
>> +
>> + spin_lock_bh(&chan->lock);
>> +
>> + /* Process all running descriptor */
>> + xgene_dma_cleanup_descriptors(chan);
>> +
>> + /* Clean all link descriptor queues */
>> + xgene_dma_free_desc_list(chan, &chan->ld_pending);
>> + xgene_dma_free_desc_list(chan, &chan->ld_running);
>> + xgene_dma_free_desc_list(chan, &chan->ld_completed);
>> +
>> + spin_unlock_bh(&chan->lock);
>> +
>> + /* Delete this channel DMA pool */
>> + dma_pool_destroy(chan->desc_pool);
>> + chan->desc_pool = NULL;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *xgene_dma_prep_memcpy(
>> + struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src,
>> + size_t len, unsigned long flags)
>> +{
>> + struct xgene_dma_desc_sw *first = NULL, *new;
>> + struct xgene_dma_chan *chan;
>> + size_t copy;
>> +
>> + if (unlikely(!dchan || !len))
>> + return NULL;
>> +
>> + chan = to_dma_chan(dchan);
>> +
>> + do {
>> + /* Allocate the link descriptor from DMA pool */
>> + new = xgene_dma_alloc_descriptor(chan);
>> + if (!new)
>> + goto fail;
>> +
>> + /* Create the largest transaction possible */
>> + copy = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT);
>> +
>> + /* Prepare DMA descriptor */
>> + xgene_dma_prep_cpy_desc(chan, new, dst, src, copy);
>> +
>> + if (!first)
>> + first = new;
>> +
>> + new->tx.cookie = 0;
>> + async_tx_ack(&new->tx);
>> +
>> + /* Update metadata */
>> + len -= copy;
>> + dst += copy;
>> + src += copy;
>> +
>> + /* Insert the link descriptor to the LD ring */
>> + list_add_tail(&new->node, &first->tx_list);
>> + } while (len);
>> +
>> + new->tx.flags = flags; /* client is in control of this ack */
>> + new->tx.cookie = -EBUSY;
>> + list_splice(&first->tx_list, &new->tx_list);
>> +
>> + return &new->tx;
>> +
>> +fail:
>> + if (!first)
>> + return NULL;
>> +
>> + xgene_dma_free_tx_desc_list(chan, &first->tx_list);
>> + return NULL;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *xgene_dma_prep_sg(
>> + struct dma_chan *dchan, struct scatterlist *dst_sg,
>> + u32 dst_nents, struct scatterlist *src_sg,
>> + u32 src_nents, unsigned long flags)
>> +{
>> + struct xgene_dma_desc_sw *first = NULL, *new = NULL;
>> + struct xgene_dma_chan *chan;
>> + size_t dst_avail, src_avail;
>> + dma_addr_t dst, src;
>> + size_t len;
>> +
>> + if (unlikely(!dchan))
>> + return NULL;
>> +
>> + if (unlikely(!dst_nents || !src_nents))
>> + return NULL;
>> +
>> + if (unlikely(!dst_sg || !src_sg))
>> + return NULL;
>> +
>> + chan = to_dma_chan(dchan);
>> +
>> + /* Get prepared for the loop */
>> + dst_avail = sg_dma_len(dst_sg);
>> + src_avail = sg_dma_len(src_sg);
>> + dst_nents--;
>> + src_nents--;
>> +
>> + /* Run until we are out of scatterlist entries */
>> + while (true) {
>> + /* Create the largest transaction possible */
>> + len = min_t(size_t, src_avail, dst_avail);
>> + len = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT);
>> + if (len == 0)
>> + goto fetch;
>> +
>> + dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
>> + src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
>> +
>> + /* Allocate the link descriptor from DMA pool */
>> + new = xgene_dma_alloc_descriptor(chan);
>> + if (!new)
>> + goto fail;
>> +
>> + /* Prepare DMA descriptor */
>> + xgene_dma_prep_cpy_desc(chan, new, dst, src, len);
>> +
>> + if (!first)
>> + first = new;
>> +
>> + new->tx.cookie = 0;
>> + async_tx_ack(&new->tx);
>> +
>> + /* update metadata */
>> + dst_avail -= len;
>> + src_avail -= len;
>> +
>> + /* Insert the link descriptor to the LD ring */
>> + list_add_tail(&new->node, &first->tx_list);
>> +
>> +fetch:
>> + /* fetch the next dst scatterlist entry */
>> + if (dst_avail == 0) {
>> + /* no more entries: we're done */
>> + if (dst_nents == 0)
>> + break;
>> +
>> + /* fetch the next entry: if there are no more: done */
>> + dst_sg = sg_next(dst_sg);
>> + if (!dst_sg)
>> + break;
>> +
>> + dst_nents--;
>> + dst_avail = sg_dma_len(dst_sg);
>> + }
>> +
>> + /* fetch the next src scatterlist entry */
>> + if (src_avail == 0) {
>> + /* no more entries: we're done */
>> + if (src_nents == 0)
>> + break;
>> +
>> + /* fetch the next entry: if there are no more: done */
>> + src_sg = sg_next(src_sg);
>> + if (!src_sg)
>> + break;
>> +
>> + src_nents--;
>> + src_avail = sg_dma_len(src_sg);
>> + }
>> + }
>> +
>> + if (!new)
>> + return NULL;
>> +
>> + new->tx.flags = flags; /* client is in control of this ack */
>> + new->tx.cookie = -EBUSY;
>> + list_splice(&first->tx_list, &new->tx_list);
>> +
>> + return &new->tx;
>> +fail:
>> + if (!first)
>> + return NULL;
>> +
>> + xgene_dma_free_tx_desc_list(chan, &first->tx_list);
>> + return NULL;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *xgene_dma_prep_xor(
>> + struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
>> + u32 src_cnt, size_t len, unsigned long flags)
>> +{
>> + struct xgene_dma_desc_sw *first = NULL, *new;
>> + struct xgene_dma_chan *chan;
>> + static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {
>> + 0x01, 0x01, 0x01, 0x01, 0x01};
>> +
>> + if (unlikely(!dchan || !len))
>> + return NULL;
>> +
>> + chan = to_dma_chan(dchan);
>> +
>> + do {
>> + /* Allocate the link descriptor from DMA pool */
>> + new = xgene_dma_alloc_descriptor(chan);
>> + if (!new)
>> + goto fail;
>> +
>> + /* Prepare xor DMA descriptor */
>> + xgene_dma_prep_xor_desc(chan, new, &dst, src,
>> + src_cnt, &len, multi);
>> +
>> + if (!first)
>> + first = new;
>> +
>> + new->tx.cookie = 0;
>> + async_tx_ack(&new->tx);
>> +
>> + /* Insert the link descriptor to the LD ring */
>> + list_add_tail(&new->node, &first->tx_list);
>> + } while (len);
>> +
>> + new->tx.flags = flags; /* client is in control of this ack */
>> + new->tx.cookie = -EBUSY;
>> + list_splice(&first->tx_list, &new->tx_list);
>> +
>> + return &new->tx;
>> +
>> +fail:
>> + if (!first)
>> + return NULL;
>> +
>> + xgene_dma_free_tx_desc_list(chan, &first->tx_list);
>> + return NULL;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *xgene_dma_prep_pq(
>> + struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src,
>> + u32 src_cnt, const u8 *scf, size_t len, unsigned long flags)
>> +{
>> + struct xgene_dma_desc_sw *first = NULL, *new;
>> + struct xgene_dma_chan *chan;
>> + size_t _len = len;
>> + dma_addr_t _src[XGENE_DMA_MAX_XOR_SRC];
>> + static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {0x01, 0x01, 0x01, 0x01, 0x01};
>> +
>> + if (unlikely(!dchan || !len))
>> + return NULL;
>> +
>> + chan = to_dma_chan(dchan);
>> +
>> + /*
>> + * Save source addresses on local variable, may be we have to
>> + * prepare two descriptor to generate P and Q if both enabled
>> + * in the flags by client
>> + */
>> + memcpy(_src, src, sizeof(*src) * src_cnt);
>> +
>> + if (flags & DMA_PREP_PQ_DISABLE_P)
>> + len = 0;
>> +
>> + if (flags & DMA_PREP_PQ_DISABLE_Q)
>> + _len = 0;
>> +
>> + do {
>> + /* Allocate the link descriptor from DMA pool */
>> + new = xgene_dma_alloc_descriptor(chan);
>> + if (!new)
>> + goto fail;
>> +
>> + if (!first)
>> + first = new;
>> +
>> + new->tx.cookie = 0;
>> + async_tx_ack(&new->tx);
>> +
>> + /* Insert the link descriptor to the LD ring */
>> + list_add_tail(&new->node, &first->tx_list);
>> +
>> + /*
>> + * Prepare DMA descriptor to generate P,
>> + * if DMA_PREP_PQ_DISABLE_P flag is not set
>> + */
>> + if (len) {
>> + xgene_dma_prep_xor_desc(chan, new, &dst[0], src,
>> + src_cnt, &len, multi);
>> + continue;
>> + }
>> +
>> + /*
>> + * Prepare DMA descriptor to generate Q,
>> + * if DMA_PREP_PQ_DISABLE_Q flag is not set
>> + */
>> + if (_len) {
>> + xgene_dma_prep_xor_desc(chan, new, &dst[1], _src,
>> + src_cnt, &_len, scf);
>> + }
>> + } while (len || _len);
>> +
>> + new->tx.flags = flags; /* client is in control of this ack */
>> + new->tx.cookie = -EBUSY;
>> + list_splice(&first->tx_list, &new->tx_list);
>> +
>> + return &new->tx;
>> +
>> +fail:
>> + if (!first)
>> + return NULL;
>> +
>> + xgene_dma_free_tx_desc_list(chan, &first->tx_list);
>> + return NULL;
>> +}
>> +
>> +static void xgene_dma_issue_pending(struct dma_chan *dchan)
>> +{
>> + struct xgene_dma_chan *chan = to_dma_chan(dchan);
>> +
>> + spin_lock_bh(&chan->lock);
>> + xgene_chan_xfer_ld_pending(chan);
>> + spin_unlock_bh(&chan->lock);
>> +}
>> +
>> +static enum dma_status xgene_dma_tx_status(struct dma_chan *dchan,
>> + dma_cookie_t cookie,
>> + struct dma_tx_state *txstate)
>> +{
>> + return dma_cookie_status(dchan, cookie, txstate);
>> +}
>> +
>> +static void xgene_dma_tasklet_cb(unsigned long data)
>> +{
>> + struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
>> +
>> + spin_lock_bh(&chan->lock);
>> +
>> + /* Run all cleanup for descriptors which have been completed */
>> + xgene_dma_cleanup_descriptors(chan);
>> +
>> + /* Re-enable DMA channel IRQ */
>> + enable_irq(chan->rx_irq);
>> +
>> + spin_unlock_bh(&chan->lock);
>> +}
>> +
>> +static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
>> +{
>> + struct xgene_dma_chan *chan = (struct xgene_dma_chan *)id;
>> +
>> + BUG_ON(!chan);
>> +
>> + /*
>> + * Disable DMA channel IRQ until we process completed
>> + * descriptors
>> + */
>> + disable_irq_nosync(chan->rx_irq);
>> +
>> + /*
>> + * Schedule the tasklet to handle all cleanup of the current
>> + * transaction. It will start a new transaction if there is
>> + * one pending.
>> + */
>> + tasklet_schedule(&chan->tasklet);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static irqreturn_t xgene_dma_err_isr(int irq, void *id)
>> +{
>> + struct xgene_dma *pdma = (struct xgene_dma *)id;
>> + unsigned long int_mask;
>> + u32 val, i;
>> +
>> + val = ioread32(pdma->csr_dma + XGENE_DMA_INT);
>> +
>> + /* Clear DMA interrupts */
>> + iowrite32(val, pdma->csr_dma + XGENE_DMA_INT);
>> +
>> + /* Print DMA error info */
>> + int_mask = val >> XGENE_DMA_INT_MASK_SHIFT;
>> + for_each_set_bit(i, &int_mask, ARRAY_SIZE(xgene_dma_err))
>> + dev_err(pdma->dev,
>> + "Interrupt status 0x%08X %s\n", val, xgene_dma_err[i]);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static void xgene_dma_wr_ring_state(struct xgene_dma_ring *ring)
>> +{
>> + int i;
>> +
>> + iowrite32(ring->num, ring->pdma->csr_ring + XGENE_DMA_RING_STATE);
>> +
>> + for (i = 0; i < XGENE_DMA_RING_NUM_CONFIG; i++)
>> + iowrite32(ring->state[i], ring->pdma->csr_ring +
>> + XGENE_DMA_RING_STATE_WR_BASE + (i * 4));
>> +}
>> +
>> +static void xgene_dma_clr_ring_state(struct xgene_dma_ring *ring)
>> +{
>> + memset(ring->state, 0, sizeof(u32) * XGENE_DMA_RING_NUM_CONFIG);
>> + xgene_dma_wr_ring_state(ring);
>> +}
>> +
>> +static void xgene_dma_setup_ring(struct xgene_dma_ring *ring)
>> +{
>> + void *ring_cfg = ring->state;
>> + u64 addr = ring->desc_paddr;
>> + void *desc;
>> + u32 i, val;
>> +
>> + ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE;
>> +
>> + /* Clear DMA ring state */
>> + xgene_dma_clr_ring_state(ring);
>> +
>> + /* Set DMA ring type */
>> + XGENE_DMA_RING_TYPE_SET(ring_cfg, XGENE_DMA_RING_TYPE_REGULAR);
>> +
>> + if (ring->owner == XGENE_DMA_RING_OWNER_DMA) {
>> + /* Set recombination buffer and timeout */
>> + XGENE_DMA_RING_RECOMBBUF_SET(ring_cfg);
>> + XGENE_DMA_RING_RECOMTIMEOUTL_SET(ring_cfg);
>> + XGENE_DMA_RING_RECOMTIMEOUTH_SET(ring_cfg);
>> + }
>> +
>> + /* Initialize DMA ring state */
>> + XGENE_DMA_RING_SELTHRSH_SET(ring_cfg);
>> + XGENE_DMA_RING_ACCEPTLERR_SET(ring_cfg);
>> + XGENE_DMA_RING_COHERENT_SET(ring_cfg);
>> + XGENE_DMA_RING_ADDRL_SET(ring_cfg, addr);
>> + XGENE_DMA_RING_ADDRH_SET(ring_cfg, addr);
>> + XGENE_DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize);
>> +
>> + /* Write DMA ring configurations */
>> + xgene_dma_wr_ring_state(ring);
>> +
>> + /* Set DMA ring id */
>> + iowrite32(XGENE_DMA_RING_ID_SETUP(ring->id),
>> + ring->pdma->csr_ring + XGENE_DMA_RING_ID);
>> +
>> + /* Set DMA ring buffer */
>> + iowrite32(XGENE_DMA_RING_ID_BUF_SETUP(ring->num),
>> + ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
>> +
>> + if (ring->owner != XGENE_DMA_RING_OWNER_CPU)
>> + return;
>> +
>> + /* Set empty signature to DMA Rx ring descriptors */
>> + for (i = 0; i < ring->slots; i++) {
>> + desc = &ring->desc_hw[i];
>> + XGENE_DMA_DESC_SET_EMPTY(desc);
>> + }
>> +
>> + /* Enable DMA Rx ring interrupt */
>> + val = ioread32(ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
>> + XGENE_DMA_RING_NE_INT_MODE_SET(val, ring->buf_num);
>> + iowrite32(val, ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE);
>> +}
>> +
>> +static void xgene_dma_clear_ring(struct xgene_dma_ring *ring)
>> +{
>> + u32 ring_id, val;
>> +
>> + if (ring->owner == XGENE_DMA_RING_OWNER_CPU) {
>> + /* Disable DMA Rx ring interrupt */
>> + val = ioread32(ring->pdma->csr_ring +
>> + XGENE_DMA_RING_NE_INT_MODE);
>> + XGENE_DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num);
>> + iowrite32(val, ring->pdma->csr_ring +
>> + XGENE_DMA_RING_NE_INT_MODE);
>> + }
>> +
>> + /* Clear DMA ring state */
>> + ring_id = XGENE_DMA_RING_ID_SETUP(ring->id);
>> + iowrite32(ring_id, ring->pdma->csr_ring + XGENE_DMA_RING_ID);
>> +
>> + iowrite32(0, ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF);
>> + xgene_dma_clr_ring_state(ring);
>> +}
>> +
>> +static void xgene_dma_set_ring_cmd(struct xgene_dma_ring *ring)
>> +{
>> + ring->cmd_base = ring->pdma->csr_ring_cmd +
>> + XGENE_DMA_RING_CMD_BASE_OFFSET((ring->num -
>> + XGENE_DMA_RING_NUM));
>> +
>> + ring->cmd = ring->cmd_base + XGENE_DMA_RING_CMD_OFFSET;
>> +}
>> +
>> +static int xgene_dma_get_ring_size(struct xgene_dma_chan *chan,
>> + enum xgene_dma_ring_cfgsize cfgsize)
>> +{
>> + int size;
>> +
>> + switch (cfgsize) {
>> + case XGENE_DMA_RING_CFG_SIZE_512B:
>> + size = 0x200;
>> + break;
>> + case XGENE_DMA_RING_CFG_SIZE_2KB:
>> + size = 0x800;
>> + break;
>> + case XGENE_DMA_RING_CFG_SIZE_16KB:
>> + size = 0x4000;
>> + break;
>> + case XGENE_DMA_RING_CFG_SIZE_64KB:
>> + size = 0x10000;
>> + break;
>> + case XGENE_DMA_RING_CFG_SIZE_512KB:
>> + size = 0x80000;
>> + break;
>> + default:
>> + chan_err(chan, "Unsupported cfg ring size %d\n", cfgsize);
>> + return -EINVAL;
>> + }
>> +
>> + return size;
>> +}
>> +
>> +static void xgene_dma_delete_ring_one(struct xgene_dma_ring *ring)
>> +{
>> + /* Clear DMA ring configurations */
>> + xgene_dma_clear_ring(ring);
>> +
>> + /* De-allocate DMA ring descriptor */
>> + if (ring->desc_vaddr) {
>> + dma_free_coherent(ring->pdma->dev, ring->size,
>> + ring->desc_vaddr, ring->desc_paddr);
>> + ring->desc_vaddr = NULL;
>> + }
>> +}
>> +
>> +static void xgene_dma_delete_chan_rings(struct xgene_dma_chan *chan)
>> +{
>> + xgene_dma_delete_ring_one(&chan->rx_ring);
>> + xgene_dma_delete_ring_one(&chan->tx_ring);
>> +}
>> +
>> +static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan,
>> + struct xgene_dma_ring *ring,
>> + enum xgene_dma_ring_cfgsize cfgsize)
>> +{
>> + /* Setup DMA ring descriptor variables */
>> + ring->pdma = chan->pdma;
>> + ring->cfgsize = cfgsize;
>> + ring->num = chan->pdma->ring_num++;
>> + ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num);
>> +
>> + ring->size = xgene_dma_get_ring_size(chan, cfgsize);
>> + if (ring->size <= 0)
>> + return ring->size;
>> +
>> + /* Allocate memory for DMA ring descriptor */
>> + ring->desc_vaddr = dma_zalloc_coherent(chan->dev, ring->size,
>> + &ring->desc_paddr, GFP_KERNEL);
>> + if (!ring->desc_vaddr) {
>> + chan_err(chan, "Failed to allocate ring desc\n");
>> + return -ENOMEM;
>> + }
>> +
>> + /* Configure and enable DMA ring */
>> + xgene_dma_set_ring_cmd(ring);
>> + xgene_dma_setup_ring(ring);
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_dma_create_chan_rings(struct xgene_dma_chan *chan)
>> +{
>> + struct xgene_dma_ring *rx_ring = &chan->rx_ring;
>> + struct xgene_dma_ring *tx_ring = &chan->tx_ring;
>> + int ret;
>> +
>> + /* Create DMA Rx ring descriptor */
>> + rx_ring->owner = XGENE_DMA_RING_OWNER_CPU;
>> + rx_ring->buf_num = XGENE_DMA_CPU_BUFNUM + chan->id;
>> +
>> + ret = xgene_dma_create_ring_one(chan, rx_ring,
>> + XGENE_DMA_RING_CFG_SIZE_64KB);
>> + if (ret)
>> + return ret;
>> +
>> + chan_dbg(chan, "Rx ring id 0x%X num %d desc 0x%p\n",
>> + rx_ring->id, rx_ring->num, rx_ring->desc_vaddr);
>> +
>> + /* Create DMA Tx ring descriptor */
>> + tx_ring->owner = XGENE_DMA_RING_OWNER_DMA;
>> + tx_ring->buf_num = XGENE_DMA_BUFNUM + chan->id;
>> +
>> + ret = xgene_dma_create_ring_one(chan, tx_ring,
>> + XGENE_DMA_RING_CFG_SIZE_64KB);
>> + if (ret) {
>> + xgene_dma_delete_ring_one(rx_ring);
>> + return ret;
>> + }
>> +
>> + tx_ring->dst_ring_num = XGENE_DMA_RING_DST_ID(rx_ring->num);
>> +
>> + chan_dbg(chan,
>> + "Tx ring id 0x%X num %d desc 0x%p\n",
>> + tx_ring->id, tx_ring->num, tx_ring->desc_vaddr);
>> +
>> + /* Set the max outstanding request possible to this channel */
>> + chan->max_outstanding = rx_ring->slots;
>> +
>> + return ret;
>> +}
>> +
>> +static int xgene_dma_init_rings(struct xgene_dma *pdma)
>> +{
>> + int ret, i, j;
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
>> + ret = xgene_dma_create_chan_rings(&pdma->chan[i]);
>> + if (ret) {
>> + for (j = 0; j < i; j++)
>> + xgene_dma_delete_chan_rings(&pdma->chan[j]);
>> + return ret;
>> + }
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static void xgene_dma_enable(struct xgene_dma *pdma)
>> +{
>> + u32 val;
>> +
>> + /* Configure and enable DMA engine */
>> + val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
>> + XGENE_DMA_CH_SETUP(val);
>> + XGENE_DMA_ENABLE(val);
>> + iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
>> +}
>> +
>> +static void xgene_dma_disable(struct xgene_dma *pdma)
>> +{
>> + u32 val;
>> +
>> + val = ioread32(pdma->csr_dma + XGENE_DMA_GCR);
>> + XGENE_DMA_DISABLE(val);
>> + iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR);
>> +}
>> +
>> +static void xgene_dma_mask_interrupts(struct xgene_dma *pdma)
>> +{
>> + /*
>> + * Mask DMA ring overflow, underflow and
>> + * AXI write/read error interrupts
>> + */
>> + iowrite32(XGENE_DMA_INT_ALL_MASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_MASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_MASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_MASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_MASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
>> +
>> + /* Mask DMA error interrupts */
>> + iowrite32(XGENE_DMA_INT_ALL_MASK, pdma->csr_dma + XGENE_DMA_INT_MASK);
>> +}
>> +
>> +static void xgene_dma_unmask_interrupts(struct xgene_dma *pdma)
>> +{
>> + /*
>> + * Unmask DMA ring overflow, underflow and
>> + * AXI write/read error interrupts
>> + */
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT0_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT1_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT2_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT3_MASK);
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_RING_INT4_MASK);
>> +
>> + /* Unmask DMA error interrupts */
>> + iowrite32(XGENE_DMA_INT_ALL_UNMASK,
>> + pdma->csr_dma + XGENE_DMA_INT_MASK);
>> +}
>> +
>> +static void xgene_dma_init_hw(struct xgene_dma *pdma)
>> +{
>> + u32 val;
>> +
>> + /* Associate DMA ring to corresponding ring HW */
>> + iowrite32(XGENE_DMA_ASSOC_RING_MNGR1,
>> + pdma->csr_dma + XGENE_DMA_CFG_RING_WQ_ASSOC);
>> +
>> + /* Configure RAID6 polynomial control setting */
>> + if (is_pq_enabled(pdma))
>> + iowrite32(XGENE_DMA_RAID6_MULTI_CTRL(0x1D),
>> + pdma->csr_dma + XGENE_DMA_RAID6_CONT);
>> + else
>> + dev_info(pdma->dev, "PQ is disabled in HW\n");
>> +
>> + xgene_dma_enable(pdma);
>> + xgene_dma_unmask_interrupts(pdma);
>> +
>> + /* Get DMA id and version info */
>> + val = ioread32(pdma->csr_dma + XGENE_DMA_IPBRR);
>> +
>> + /* DMA device info */
>> + dev_info(pdma->dev,
>> + "X-Gene DMA v%d.%02d.%02d driver registered %d channels",
>> + XGENE_DMA_REV_NO_RD(val), XGENE_DMA_BUS_ID_RD(val),
>> + XGENE_DMA_DEV_ID_RD(val), XGENE_DMA_MAX_CHANNEL);
>> +}
>> +
>> +int xgene_dma_init_ring_mngr(struct xgene_dma *pdma)
>> +{
>> + if (ioread32(pdma->csr_ring + XGENE_DMA_RING_CLKEN) &&
>> + (!ioread32(pdma->csr_ring + XGENE_DMA_RING_SRST)))
>> + return 0;
>> +
>> + iowrite32(0x3, pdma->csr_ring + XGENE_DMA_RING_CLKEN);
>> + iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_SRST);
>> +
>> + /* Bring up memory */
>> + iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
>> +
>> + /* Force a barrier */
>> + ioread32(pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN);
>> +
>> + /* reset may take up to 1ms */
>> + usleep_range(1000, 1100);
>> +
>> + if (ioread32(pdma->csr_ring + XGENE_DMA_RING_BLK_MEM_RDY)
>> + != XGENE_DMA_RING_BLK_MEM_RDY_VAL) {
>> + dev_err(pdma->dev,
>> + "Failed to release ring mngr memory from shutdown\n");
>> + return -ENODEV;
>> + }
>> +
>> + /* program threshold set 1 and all hysteresis */
>> + iowrite32(XGENE_DMA_RING_THRESLD0_SET1_VAL,
>> + pdma->csr_ring + XGENE_DMA_RING_THRESLD0_SET1);
>> + iowrite32(XGENE_DMA_RING_THRESLD1_SET1_VAL,
>> + pdma->csr_ring + XGENE_DMA_RING_THRESLD1_SET1);
>> + iowrite32(XGENE_DMA_RING_HYSTERESIS_VAL,
>> + pdma->csr_ring + XGENE_DMA_RING_HYSTERESIS);
>> +
>> + /* Enable QPcore and assign error queue */
>> + iowrite32(XGENE_DMA_RING_ENABLE,
>> + pdma->csr_ring + XGENE_DMA_RING_CONFIG);
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_dma_init_mem(struct xgene_dma *pdma)
>> +{
>> + int ret;
>> +
>> + ret = xgene_dma_init_ring_mngr(pdma);
>> + if (ret)
>> + return ret;
>> +
>> + /* Bring up memory */
>> + iowrite32(0x0, pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
>> +
>> + /* Force a barrier */
>> + ioread32(pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN);
>> +
>> + /* reset may take up to 1ms */
>> + usleep_range(1000, 1100);
>> +
>> + if (ioread32(pdma->csr_dma + XGENE_DMA_BLK_MEM_RDY)
>> + != XGENE_DMA_BLK_MEM_RDY_VAL) {
>> + dev_err(pdma->dev,
>> + "Failed to release DMA memory from shutdown\n");
>> + return -ENODEV;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_dma_request_irqs(struct xgene_dma *pdma)
>> +{
>> + struct xgene_dma_chan *chan;
>> + int ret, i, j;
>> +
>> + /* Register DMA error irq */
>> + ret = devm_request_irq(pdma->dev, pdma->err_irq, xgene_dma_err_isr,
>> + 0, "dma_error", pdma);
>> + if (ret) {
>> + dev_err(pdma->dev,
>> + "Failed to register error IRQ %d\n", pdma->err_irq);
>> + return ret;
>> + }
>> +
>> + /* Register DMA channel rx irq */
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
>> + chan = &pdma->chan[i];
>> + ret = devm_request_irq(chan->dev, chan->rx_irq,
>> + xgene_dma_chan_ring_isr,
>> + 0, chan->name, chan);
>> + if (ret) {
>> + chan_err(chan, "Failed to register Rx IRQ %d\n",
>> + chan->rx_irq);
>> + devm_free_irq(pdma->dev, pdma->err_irq, pdma);
>> +
>> + for (j = 0; j < i; j++) {
>> + chan = &pdma->chan[i];
>> + devm_free_irq(chan->dev, chan->rx_irq, chan);
>> + }
>> +
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void xgene_dma_free_irqs(struct xgene_dma *pdma)
>> +{
>> + struct xgene_dma_chan *chan;
>> + int i;
>> +
>> + /* Free DMA device error irq */
>> + devm_free_irq(pdma->dev, pdma->err_irq, pdma);
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
>> + chan = &pdma->chan[i];
>> + devm_free_irq(chan->dev, chan->rx_irq, chan);
>> + }
>> +}
>> +
>> +static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
>> + struct dma_device *dma_dev)
>> +{
>> + /* Initialize DMA device capability mask */
>> + dma_cap_zero(dma_dev->cap_mask);
>> +
>> + /* Set DMA device capability */
>> + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
>> + dma_cap_set(DMA_SG, dma_dev->cap_mask);
>> +
>> + /* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
>> + * and channel 1 supports XOR, PQ both. First thing here is we have
>> + * mechanism in hw to enable/disable PQ/XOR supports on channel 1,
>> + * we can make sure this by reading SoC Efuse register.
>> + * Second thing, we have hw errata that if we run channel 0 and
>> + * channel 1 simultaneously with executing XOR and PQ request,
>> + * suddenly DMA engine hangs, So here we enable XOR on channel 0 only
>> + * if XOR and PQ supports on channel 1 is disabled.
>> + */
>> + if ((chan->id == XGENE_DMA_PQ_CHANNEL) &&
>> + is_pq_enabled(chan->pdma)) {
>> + dma_cap_set(DMA_PQ, dma_dev->cap_mask);
>> + dma_cap_set(DMA_XOR, dma_dev->cap_mask);
>> + } else if ((chan->id == XGENE_DMA_XOR_CHANNEL) &&
>> + !is_pq_enabled(chan->pdma)) {
>> + dma_cap_set(DMA_XOR, dma_dev->cap_mask);
>> + }
>> +
>> + /* Set base and prep routines */
>> + dma_dev->dev = chan->dev;
>> + dma_dev->device_alloc_chan_resources = xgene_dma_alloc_chan_resources;
>> + dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources;
>> + dma_dev->device_issue_pending = xgene_dma_issue_pending;
>> + dma_dev->device_tx_status = xgene_dma_tx_status;
>> + dma_dev->device_prep_dma_memcpy = xgene_dma_prep_memcpy;
>> + dma_dev->device_prep_dma_sg = xgene_dma_prep_sg;
>> +
>> + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
>> + dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
>> + dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
>> + dma_dev->xor_align = XGENE_DMA_XOR_ALIGNMENT;
>> + }
>> +
>> + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
>> + dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
>> + dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
>> + dma_dev->pq_align = XGENE_DMA_XOR_ALIGNMENT;
>> + }
>> +}
>> +
>> +static int xgene_dma_async_register(struct xgene_dma *pdma, int id)
>> +{
>> + struct xgene_dma_chan *chan = &pdma->chan[id];
>> + struct dma_device *dma_dev = &pdma->dma_dev[id];
>> + int ret;
>> +
>> + chan->dma_chan.device = dma_dev;
>> +
>> + spin_lock_init(&chan->lock);
>> + INIT_LIST_HEAD(&chan->ld_pending);
>> + INIT_LIST_HEAD(&chan->ld_running);
>> + INIT_LIST_HEAD(&chan->ld_completed);
>> + tasklet_init(&chan->tasklet, xgene_dma_tasklet_cb,
>> + (unsigned long)chan);
>> +
>> + chan->pending = 0;
>> + chan->desc_pool = NULL;
>> + dma_cookie_init(&chan->dma_chan);
>> +
>> + /* Setup dma device capabilities and prep routines */
>> + xgene_dma_set_caps(chan, dma_dev);
>> +
>> + /* Initialize DMA device list head */
>> + INIT_LIST_HEAD(&dma_dev->channels);
>> + list_add_tail(&chan->dma_chan.device_node, &dma_dev->channels);
>> +
>> + /* Register with Linux async DMA framework*/
>> + ret = dma_async_device_register(dma_dev);
>> + if (ret) {
>> + chan_err(chan, "Failed to register async device %d", ret);
>> + tasklet_kill(&chan->tasklet);
>> +
>> + return ret;
>> + }
>> +
>> + /* DMA capability info */
>> + dev_info(pdma->dev,
>> + "%s: CAPABILITY ( %s%s%s%s)\n", dma_chan_name(&chan->dma_chan),
>> + dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "MEMCPY " : "",
>> + dma_has_cap(DMA_SG, dma_dev->cap_mask) ? "SGCPY " : "",
>> + dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "",
>> + dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : "");
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_dma_init_async(struct xgene_dma *pdma)
>> +{
>> + int ret, i, j;
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL ; i++) {
>> + ret = xgene_dma_async_register(pdma, i);
>> + if (ret) {
>> + for (j = 0; j < i; j++) {
>> + dma_async_device_unregister(&pdma->dma_dev[j]);
>> + tasklet_kill(&pdma->chan[j].tasklet);
>> + }
>> +
>> + return ret;
>> + }
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static void xgene_dma_async_unregister(struct xgene_dma *pdma)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
>> + dma_async_device_unregister(&pdma->dma_dev[i]);
>> +}
>> +
>> +static void xgene_dma_init_channels(struct xgene_dma *pdma)
>> +{
>> + struct xgene_dma_chan *chan;
>> + int i;
>> +
>> + pdma->ring_num = XGENE_DMA_RING_NUM;
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
>> + chan = &pdma->chan[i];
>> + chan->dev = pdma->dev;
>> + chan->pdma = pdma;
>> + chan->id = i;
>> + sprintf(chan->name, "dmachan%d", chan->id);
>> + }
>> +}
>> +
>> +static int xgene_dma_get_resources(struct platform_device *pdev,
>> + struct xgene_dma *pdma)
>> +{
>> + struct resource *res;
>> + int irq, i;
>> +
>> + /* Get DMA csr region */
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res) {
>> + dev_err(&pdev->dev, "Failed to get csr region\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->csr_dma = devm_ioremap(&pdev->dev, res->start,
>> + resource_size(res));
>> + if (IS_ERR(pdma->csr_dma)) {
>> + dev_err(&pdev->dev, "Failed to ioremap csr region");
>> + return PTR_ERR(pdma->csr_dma);
>> + }
>> +
>> + /* Get DMA ring csr region */
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> + if (!res) {
>> + dev_err(&pdev->dev, "Failed to get ring csr region\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->csr_ring = devm_ioremap(&pdev->dev, res->start,
>> + resource_size(res));
>> + if (IS_ERR(pdma->csr_ring)) {
>> + dev_err(&pdev->dev, "Failed to ioremap ring csr region");
>> + return PTR_ERR(pdma->csr_ring);
>> + }
>> +
>> + /* Get DMA ring cmd csr region */
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
>> + if (!res) {
>> + dev_err(&pdev->dev, "Failed to get ring cmd csr region\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start,
>> + resource_size(res));
>> + if (IS_ERR(pdma->csr_ring_cmd)) {
>> + dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region");
>> + return PTR_ERR(pdma->csr_ring_cmd);
>> + }
>> +
>> + /* Get efuse csr region */
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
>> + if (!res) {
>> + dev_err(&pdev->dev, "Failed to get efuse csr region\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start,
>> + resource_size(res));
>> + if (IS_ERR(pdma->csr_efuse)) {
>> + dev_err(&pdev->dev, "Failed to ioremap efuse csr region");
>> + return PTR_ERR(pdma->csr_efuse);
>> + }
>> +
>> + /* Get DMA error interrupt */
>> + irq = platform_get_irq(pdev, 0);
>> + if (irq <= 0) {
>> + dev_err(&pdev->dev, "Failed to get Error IRQ\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->err_irq = irq;
>> +
>> + /* Get DMA Rx ring descriptor interrupts for all DMA channels */
>> + for (i = 1; i <= XGENE_DMA_MAX_CHANNEL; i++) {
>> + irq = platform_get_irq(pdev, i);
>> + if (irq <= 0) {
>> + dev_err(&pdev->dev, "Failed to get Rx IRQ\n");
>> + return -ENXIO;
>> + }
>> +
>> + pdma->chan[i - 1].rx_irq = irq;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int xgene_dma_probe(struct platform_device *pdev)
>> +{
>> + struct xgene_dma *pdma;
>> + int ret, i;
>> +
>> + pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL);
>> + if (!pdma)
>> + return -ENOMEM;
>> +
>> + pdma->dev = &pdev->dev;
>> + platform_set_drvdata(pdev, pdma);
>> +
>> + ret = xgene_dma_get_resources(pdev, pdma);
>> + if (ret)
>> + return ret;
>> +
>> + pdma->clk = devm_clk_get(&pdev->dev, NULL);
>> + if (IS_ERR(pdma->clk)) {
>> + dev_err(&pdev->dev, "Failed to get clk\n");
>> + return PTR_ERR(pdma->clk);
>> + }
>> +
>> + /* Enable clk before accessing registers */
>> + ret = clk_prepare_enable(pdma->clk);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
>> + return ret;
>> + }
>> +
>> + /* Remove DMA RAM out of shutdown */
>> + ret = xgene_dma_init_mem(pdma);
>> + if (ret)
>> + goto err_clk_enable;
>> +
>> + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(42));
>> + if (ret) {
>> + dev_err(&pdev->dev, "No usable DMA configuration\n");
>> + goto err_dma_mask;
>> + }
>> +
>> + /* Initialize DMA channels software state */
>> + xgene_dma_init_channels(pdma);
>> +
>> + /* Configue DMA rings */
>> + ret = xgene_dma_init_rings(pdma);
>> + if (ret)
>> + goto err_clk_enable;
>> +
>> + ret = xgene_dma_request_irqs(pdma);
>> + if (ret)
>> + goto err_request_irq;
>> +
>> + /* Configure and enable DMA engine */
>> + xgene_dma_init_hw(pdma);
>> +
>> + /* Register DMA device with linux async framework */
>> + ret = xgene_dma_init_async(pdma);
>> + if (ret)
>> + goto err_async_init;
>> +
>> + return 0;
>> +
>> +err_async_init:
>> + xgene_dma_free_irqs(pdma);
>> +
>> +err_request_irq:
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++)
>> + xgene_dma_delete_chan_rings(&pdma->chan[i]);
>> +
>> +err_dma_mask:
>> +err_clk_enable:
>> + clk_disable_unprepare(pdma->clk);
>> +
>> + return ret;
>> +}
>> +
>> +static int xgene_dma_remove(struct platform_device *pdev)
>> +{
>> + struct xgene_dma *pdma = platform_get_drvdata(pdev);
>> + struct xgene_dma_chan *chan;
>> + int i;
>> +
>> + xgene_dma_async_unregister(pdma);
>> +
>> + /* Mask interrupts and disable DMA engine */
>> + xgene_dma_mask_interrupts(pdma);
>> + xgene_dma_disable(pdma);
>> + xgene_dma_free_irqs(pdma);
>> +
>> + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) {
>> + chan = &pdma->chan[i];
>> + tasklet_kill(&chan->tasklet);
>> + xgene_dma_delete_chan_rings(chan);
>> + }
>> +
>> + clk_disable_unprepare(pdma->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id xgene_dma_of_match_ptr[] = {
>> + {.compatible = "apm,xgene-storm-dma",},
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, xgene_dma_of_match_ptr);
>> +
>> +static struct platform_driver xgene_dma_driver = {
>> + .probe = xgene_dma_probe,
>> + .remove = xgene_dma_remove,
>> + .driver = {
>> + .name = "X-Gene-DMA",
>> + .owner = THIS_MODULE,
>> + .of_match_table = xgene_dma_of_match_ptr,
>> + },
>> +};
>> +
>> +module_platform_driver(xgene_dma_driver);
>> +
>> +MODULE_DESCRIPTION("APM X-Gene SoC DMA driver");
>> +MODULE_AUTHOR("Rameshwar Prasad Sahu <rsahu@xxxxxxx>");
>> +MODULE_AUTHOR("Loc Ho <lho@xxxxxxx>");
>> +MODULE_LICENSE("GPL");
>> +MODULE_VERSION("1.0");
>> --
>> 1.8.2.1
>>
>
>
> Any comments on above patch....
Pinging again...
Thanks,
Ram
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