Hi Vinod, On Mon, Mar 23, 2015 at 4:37 PM, Rameshwar Sahu <rsahu@xxxxxxx> wrote: > 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... Can you please review the above patch, so that I can go ahead for next version if you still feel needs changes. > > Thanks, > Ram -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
