Hi Vinod, On Tue, Feb 24, 2015 at 6:23 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 and scatter-gather memory copy > 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 | 1738 +++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 1747 insertions(+) > create mode 100755 drivers/dma/xgene-dma.c > > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index a874b6e..0e05831 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" > + depends on ARCH_XGENE > + select DMA_ENGINE > + 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..e736c2e > --- /dev/null > +++ b/drivers/dma/xgene-dma.c > @@ -0,0 +1,1738 @@ > +/* > + * 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" > + > +/* DMA ring csr registers and bit definations */ > +#define DMA_RING_CONFIG 0x04 > +#define DMA_RING_ENABLE BIT(31) > +#define DMA_RING_ID 0x08 > +#define DMA_RING_ID_SETUP(v) ((v) | BIT(31)) > +#define DMA_RING_ID_BUF 0x0C > +#define DMA_RING_ID_BUF_SETUP(v) (((v) << 9) | BIT(21)) > +#define DMA_RING_THRESLD0_SET1 0x30 > +#define DMA_RING_THRESLD0_SET1_VAL 0X64 > +#define DMA_RING_THRESLD1_SET1 0x34 > +#define DMA_RING_THRESLD1_SET1_VAL 0xC8 > +#define DMA_RING_HYSTERESIS 0x68 > +#define DMA_RING_HYSTERESIS_VAL 0xFFFFFFFF > +#define DMA_RING_STATE 0x6C > +#define DMA_RING_STATE_WR_BASE 0x70 > +#define DMA_RING_NE_INT_MODE 0x017C > +#define DMA_RING_NE_INT_MODE_SET(m, v) \ > + ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v))) > +#define DMA_RING_NE_INT_MODE_RESET(m, v) \ > + ((m) &= (~BIT(31 - (v)))) > +#define DMA_RING_CLKEN 0xC208 > +#define DMA_RING_SRST 0xC200 > +#define DMA_RING_MEM_RAM_SHUTDOWN 0xD070 > +#define DMA_RING_BLK_MEM_RDY 0xD074 > +#define DMA_RING_BLK_MEM_RDY_VAL 0xFFFFFFFF > +#define DMA_RING_DESC_CNT(v) (((v) & 0x0001FFFE) >> 1) > +#define DMA_RING_ID_GET(owner, num) (((owner) << 6) | (num)) > +#define DMA_RING_DST_ID(v) ((1 << 10) | (v)) > +#define DMA_RING_CMD_OFFSET 0x2C > +#define DMA_RING_CMD_BASE_OFFSET(v) ((v) << 6) > +#define DMA_RING_COHERENT_SET(m) (((u32 *)(m))[2] |= BIT(4)) > +#define DMA_RING_ADDRL_SET(m, v) (((u32 *)(m))[2] |= (((v) >> 8) << 5)) > +#define DMA_RING_ADDRH_SET(m, v) (((u32 *)(m))[3] |= ((v) >> 35)) > +#define DMA_RING_ACCEPTLERR_SET(m) (((u32 *)(m))[3] |= BIT(19)) > +#define DMA_RING_SIZE_SET(m, v) (((u32 *)(m))[3] |= ((v) << 23)) > +#define DMA_RING_RECOMBBUF_SET(m) (((u32 *)(m))[3] |= BIT(27)) > +#define DMA_RING_RECOMTIMEOUTL_SET(m) (((u32 *)(m))[3] |= (0x7 << 28)) > +#define DMA_RING_RECOMTIMEOUTH_SET(m) (((u32 *)(m))[4] |= 0x3) > +#define DMA_RING_SELTHRSH_SET(m) (((u32 *)(m))[4] |= BIT(3)) > +#define DMA_RING_TYPE_SET(m, v) (((u32 *)(m))[4] |= ((v) << 19)) > + > +/* DMA device csr registers and bit definitions */ > +#define DMA_IPBRR 0x0 > +#define DMA_DEV_ID_RD(v) ((v) & 0x00000FFF) > +#define DMA_BUS_ID_RD(v) (((v) >> 12) & 3) > +#define DMA_REV_NO_RD(v) (((v) >> 14) & 3) > +#define DMA_GCR 0x10 > +#define DMA_CH_SETUP(v) ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF) > +#define DMA_ENABLE(v) ((v) |= BIT(31)) > +#define DMA_DISABLE(v) ((v) &= ~BIT(31)) > +#define DMA_INT 0x70 > +#define DMA_INT_MASK 0x74 > +#define DMA_INT_ALL_MASK 0xFFFFFFFF > +#define DMA_INT_ALL_UNMASK 0x0 > +#define DMA_INT_MASK_SHIFT 0x14 > +#define DMA_RING_INT0_MASK 0x90A0 > +#define DMA_RING_INT1_MASK 0x90A8 > +#define DMA_RING_INT2_MASK 0x90B0 > +#define DMA_RING_INT3_MASK 0x90B8 > +#define DMA_RING_INT4_MASK 0x90C0 > +#define DMA_CFG_RING_WQ_ASSOC 0x90E0 > +#define DMA_ASSOC_RING_MNGR1 0xFFFFFFFF > +#define DMA_MEM_RAM_SHUTDOWN 0xD070 > +#define DMA_BLK_MEM_RDY 0xD074 > +#define DMA_BLK_MEM_RDY_VAL 0xFFFFFFFF > + > +/* DMA Descriptor format */ > +#define DMA_DESC_ELERR_RD(m) (((m) >> 46) & 0x3) > +#define DMA_DESC_NV_SET(m) (((u64 *)(m))[0] |= BIT_ULL(50)) > +#define DMA_DESC_IN_SET(m) (((u64 *)(m))[0] |= BIT_ULL(55)) > +#define DMA_DESC_RTYPE_SET(m, v) (((u64 *)(m))[0] |= ((u64)(v) << 56)) > +#define DMA_DESC_LERR_RD(m) (((m) >> 60) & 0x7) > +#define DMA_DESC_BUFADDR_SET(m, v) (((u64 *)(m))[0] |= (v)) > +#define DMA_DESC_BUFLEN_SET(m, v) (((u64 *)(m))[0] |= ((u64)(v) << 48)) > +#define DMA_DESC_C_SET(m) (((u64 *)(m))[1] |= BIT_ULL(63)) > +#define DMA_DESC_DR_SET(m) (((u64 *)(m))[2] |= BIT_ULL(61)) > +#define DMA_DESC_DST_ADDR_SET(m, v) (((u64 *)(m))[3] |= (v)) > +#define DMA_DESC_H0ENQ_NUM_SET(m, v) (((u64 *)(m))[3] |= ((u64)(v) << 48)) > +#define DMA_DESC_STATUS(x, y) (((x) << 4) | (y)) > + > +/* DMA descriptor empty s/w signature */ > +#define DMA_DESC_EMPTY_INDEX 0 > +#define DMA_DESC_EMPTY_SIGNATURE ~0ULL > +#define DMA_DESC_SET_EMPTY(m) \ > + (((u64 *)(m))[DMA_DESC_EMPTY_INDEX] = DMA_DESC_EMPTY_SIGNATURE) > +#define DMA_DESC_IS_EMPTY(m) \ > + (((u64 *)(m))[DMA_DESC_EMPTY_INDEX] == DMA_DESC_EMPTY_SIGNATURE) > + > +/* DMA configurable parameters defines */ > +#define DMA_RING_NUM 512 > +#define DMA_BUFNUM 0x0 > +#define DMA_CPU_BUFNUM 0x18 > +#define DMA_RING_OWNER_DMA 0x03 > +#define DMA_RING_OWNER_CPU 0x0F > +#define DMA_RING_TYPE_REGULAR 0x01 > +#define DMA_RING_WQ_DESC_SIZE 32 > +#define DMA_RING_NUM_CONFIG 5 > +#define DMA_MAX_CHANNEL 4 > +#define DMA_MAX_BYTE_CNT 0x4000 /* 16 KB */ > +#define DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */ > +#define DMA_16K_BUFFER_LEN_CODE 0x0 > +#define DMA_INVALID_LEN_CODE 0x7800 > + > +/* 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 > + > +/* 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 > + > +/* Define to dump DMA descriptor */ > +#define DMA_DESC_ERR_DUMP(desc) \ > + print_hex_dump(KERN_ERR, "X-Gene DMA: Rx ERR DESC ", \ > + 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 { > + DMA_RING_CFG_SIZE_512B, > + DMA_RING_CFG_SIZE_2KB, > + DMA_RING_CFG_SIZE_16KB, > + DMA_RING_CFG_SIZE_64KB, > + DMA_RING_CFG_SIZE_512KB, > + 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[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; > + u8 desc_cnt; > + struct list_head node; > + struct list_head tx_list; > + struct dma_async_tx_descriptor tx; > +}; > + > +/** > + * struct xgene_dma_chan - internal representation of an DMA channel > + * @dma_chan: dmaengine channel object member > + * @pdma: 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 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, > + * @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; > + 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 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 > + * @dma_dev: embedded struct dma_device > + * @chan: reference to 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; > + struct dma_device dma_dev[DMA_MAX_CHANNEL]; > + struct xgene_dma_chan chan[DMA_MAX_CHANNEL]; > +}; > + > +static const char * const xgene_dma_desc_hw_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 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 < DMA_MAX_BYTE_CNT) ? > + len : DMA_16K_BUFFER_LEN_CODE; > +} > + > +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 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 < DMA_MAX_BYTE_CNT) ? > + *len : DMA_MAX_BYTE_CNT; > + > + DMA_DESC_BUFADDR_SET(ext8, *paddr); > + DMA_DESC_BUFLEN_SET(ext8, xgene_dma_encode_len(*len)); > + *len -= nbytes; > + *paddr += nbytes; > +} > + > +static void xgene_dma_invalidate_buffer(void *ext8) > +{ > + DMA_DESC_BUFLEN_SET(ext8, 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) > +{ > + DMA_DESC_C_SET(desc); /* Coherent IO */ > + DMA_DESC_IN_SET(desc); > + DMA_DESC_DR_SET(desc); > + DMA_DESC_RTYPE_SET(desc, DMA_RING_OWNER_DMA); > + DMA_DESC_H0ENQ_NUM_SET(desc, dst_ring_num); > +} > + > +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) > +{ > + struct xgene_dma_ring *ring = &chan->tx_ring; > + void *desc1, *desc2; > + int i; > + > + /* Get 1st descriptor */ > + desc1 = &desc_sw->desc1; > + xgene_dma_init_desc(desc1, ring->dst_ring_num); > + 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; > + desc_sw->desc_cnt = 1; > + goto skip_additional_src; > + } > + > + /* > + * We need to split this source buffer, > + * and need to use 2nd descriptor > + */ > + desc2 = &desc_sw->desc2; > + 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)); > + > + desc_sw->desc_cnt = 2; > + > +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 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_free_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_dbg(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: DMA channel > + * > + * This function is used on all completed and acked descriptors. > + * All descriptors should only be freed in this function. > + */ > +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_free_descriptor(chan, desc); > + } > +} > + > +/** > + * xgene_dma_run_tx_complete_actions - cleanup a single link descriptor > + * @chan: 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 (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: DMA channel > + * @desc: the descriptor which is completed > + * > + * Free the descriptor directly if acked by async_tx api, or 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 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); > +} > + > +/** > + * xgene_chan_xfer_ld_pending - push any pending transactions to hw > + * @chan : DMA channel > + * > + * LOCKING: must hold chan->desc_lock > + */ > +static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan) > +{ > + struct xgene_dma_ring *ring = &chan->tx_ring; > + struct xgene_dma_desc_sw *desc_sw, *_desc_sw; > + struct xgene_dma_desc_hw *desc_hw; > + > + /* > + * 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 >= ring->slots) || > + (xgene_dma_ring_desc_cnt(ring) > (ring->slots - 2))) > + break; > + > + /* 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->desc_cnt == 2) { > + desc_hw = &ring->desc_hw[ring->head]; > + > + if (++ring->head == ring->slots) > + ring->head = 0; > + > + memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw)); > + } > + > + /* > + * 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++; > + > + /* Notify the hw that we have descriptor ready for execution */ > + iowrite32(desc_sw->desc_cnt, ring->cmd); > + } > +} > + > +/** > + * xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed > + * and move them to ld_completed to free until flag 'ack' is set > + * @chan: 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(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 = DMA_DESC_STATUS( > + DMA_DESC_ELERR_RD(le64_to_cpu(desc_hw->m0)), > + DMA_DESC_LERR_RD(le64_to_cpu(desc_hw->m0))); > + if (status) { > + chan_err(chan, "%s\n", xgene_dma_desc_hw_err[status]); > + DMA_DESC_ERR_DUMP(desc_hw); > + } > + > + /* Notify the hw about this completed descriptor */ > + iowrite32(-1, ring->cmd); > + > + /* Mark this hw descriptor as processed */ > + 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: 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_free_descriptor(chan, desc); > +} > + > +static void xgene_dma_free_desc_list_reverse(struct xgene_dma_chan *chan, > + struct list_head *list) > +{ > + struct xgene_dma_desc_sw *desc, *_desc; > + > + list_for_each_entry_safe_reverse(desc, _desc, list, node) > + xgene_dma_free_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); > + > + /* Delete this channel DMA pool */ > + dma_pool_destroy(chan->desc_pool); > + chan->desc_pool = NULL; > + > + spin_unlock_bh(&chan->lock); > +} > + > +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 == 0))) > + 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, 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_desc_list_reverse(chan, &first->tx_list); > + return NULL; > +} > + > +static struct dma_async_tx_descriptor *xgene_dma_prep_sg( > + struct dma_chan *dchan, struct scatterlist *dst_sg, > + unsigned int dst_nents, struct scatterlist *src_sg, > + unsigned int 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 == 0 || src_nents == 0)) > + 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, 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_desc_list_reverse(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) > +{ > + struct xgene_dma_chan *chan = to_dma_chan(dchan); > + enum dma_status status; > + > + status = dma_cookie_status(dchan, cookie, txstate); > + if (status == DMA_COMPLETE) > + return status; > + > + /* Cleanup any running and executed descriptors */ > + spin_lock_bh(&chan->lock); > + xgene_dma_cleanup_descriptors(chan); > + spin_unlock_bh(&chan->lock); > + > + 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 + DMA_INT); > + > + /* Clear DMA interrupts */ > + iowrite32(val, pdma->csr_dma + DMA_INT); > + > + /* Print DMA error info */ > + int_mask = val >> 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 + DMA_RING_STATE); > + > + for (i = 0; i < DMA_RING_NUM_CONFIG; i++) > + iowrite32(ring->state[i], ring->pdma->csr_ring + > + 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) * 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 / DMA_RING_WQ_DESC_SIZE; > + > + /* Clear DMA ring state */ > + xgene_dma_clr_ring_state(ring); > + > + /* Set DMA ring type */ > + DMA_RING_TYPE_SET(ring_cfg, DMA_RING_TYPE_REGULAR); > + > + if (ring->owner == DMA_RING_OWNER_DMA) { > + /* Set recombination buffer and timeout */ > + DMA_RING_RECOMBBUF_SET(ring_cfg); > + DMA_RING_RECOMTIMEOUTL_SET(ring_cfg); > + DMA_RING_RECOMTIMEOUTH_SET(ring_cfg); > + } > + > + /* Initialize DMA ring state */ > + DMA_RING_SELTHRSH_SET(ring_cfg); > + DMA_RING_ACCEPTLERR_SET(ring_cfg); > + DMA_RING_COHERENT_SET(ring_cfg); > + DMA_RING_ADDRL_SET(ring_cfg, addr); > + DMA_RING_ADDRH_SET(ring_cfg, addr); > + DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize); > + > + /* Write DMA ring configurations */ > + xgene_dma_wr_ring_state(ring); > + > + /* Set DMA ring id */ > + iowrite32(DMA_RING_ID_SETUP(ring->id), > + ring->pdma->csr_ring + DMA_RING_ID); > + > + /* Set DMA ring buffer */ > + iowrite32(DMA_RING_ID_BUF_SETUP(ring->num), > + ring->pdma->csr_ring + DMA_RING_ID_BUF); > + > + if (ring->owner != 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]; > + DMA_DESC_SET_EMPTY(desc); > + } > + > + /* Enable DMA Rx ring interrupt */ > + val = ioread32(ring->pdma->csr_ring + DMA_RING_NE_INT_MODE); > + DMA_RING_NE_INT_MODE_SET(val, ring->buf_num); > + iowrite32(val, ring->pdma->csr_ring + DMA_RING_NE_INT_MODE); > +} > + > +static void xgene_dma_clear_ring(struct xgene_dma_ring *ring) > +{ > + u32 ring_id, val; > + > + if (ring->owner == DMA_RING_OWNER_CPU) { > + /* Disable DMA Rx ring interrupt */ > + val = ioread32(ring->pdma->csr_ring + DMA_RING_NE_INT_MODE); > + DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num); > + iowrite32(val, ring->pdma->csr_ring + DMA_RING_NE_INT_MODE); > + } > + > + /* Clear DMA ring state */ > + ring_id = DMA_RING_ID_SETUP(ring->id); > + iowrite32(ring_id, ring->pdma->csr_ring + DMA_RING_ID); > + > + iowrite32(0, ring->pdma->csr_ring + 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 + > + DMA_RING_CMD_BASE_OFFSET((ring->num - DMA_RING_NUM)); > + ring->cmd = ring->cmd_base + 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 DMA_RING_CFG_SIZE_512B: > + size = 0x200; > + break; > + case DMA_RING_CFG_SIZE_2KB: > + size = 0x800; > + break; > + case DMA_RING_CFG_SIZE_16KB: > + size = 0x4000; > + break; > + case DMA_RING_CFG_SIZE_64KB: > + size = 0x10000; > + break; > + case 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 = 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 = DMA_RING_OWNER_CPU; > + rx_ring->buf_num = DMA_CPU_BUFNUM + chan->id; > + > + ret = xgene_dma_create_ring_one(chan, rx_ring, 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 = DMA_RING_OWNER_DMA; > + tx_ring->buf_num = DMA_BUFNUM + chan->id; > + > + ret = xgene_dma_create_ring_one(chan, tx_ring, DMA_RING_CFG_SIZE_64KB); > + if (ret) { > + xgene_dma_delete_ring_one(rx_ring); > + return ret; > + } > + > + tx_ring->dst_ring_num = 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); > + > + return ret; > +} > + > +static int xgene_dma_init_rings(struct xgene_dma *pdma) > +{ > + int ret, i, j; > + > + for (i = 0; i < 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 + DMA_GCR); > + DMA_CH_SETUP(val); > + DMA_ENABLE(val); > + iowrite32(val, pdma->csr_dma + DMA_GCR); > +} > + > +static void xgene_dma_disable(struct xgene_dma *pdma) > +{ > + u32 val; > + > + val = ioread32(pdma->csr_dma + DMA_GCR); > + DMA_DISABLE(val); > + iowrite32(val, pdma->csr_dma + DMA_GCR); > +} > + > +static void xgene_dma_mask_interrupts(struct xgene_dma *pdma) > +{ > + /* > + * Mask DMA ring overflow, underflow and > + * AXI write/read error interrupts > + */ > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + DMA_RING_INT0_MASK); > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + DMA_RING_INT1_MASK); > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + DMA_RING_INT2_MASK); > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + DMA_RING_INT3_MASK); > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + DMA_RING_INT4_MASK); > + > + /* Mask DMA error interrupts */ > + iowrite32(DMA_INT_ALL_MASK, pdma->csr_dma + 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(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_RING_INT0_MASK); > + iowrite32(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_RING_INT1_MASK); > + iowrite32(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_RING_INT2_MASK); > + iowrite32(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_RING_INT3_MASK); > + iowrite32(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_RING_INT4_MASK); > + > + /* Unmask DMA error interrupts */ > + iowrite32(DMA_INT_ALL_UNMASK, pdma->csr_dma + DMA_INT_MASK); > +} > + > +static void xgene_dma_init_hw(struct xgene_dma *pdma) > +{ > + u32 val; > + > + /* Associate DMA ring to corresponding ring HW */ > + iowrite32(DMA_ASSOC_RING_MNGR1, > + pdma->csr_dma + DMA_CFG_RING_WQ_ASSOC); > + > + xgene_dma_enable(pdma); > + xgene_dma_unmask_interrupts(pdma); > + > + /* Get DMA id and version info */ > + val = ioread32(pdma->csr_dma + DMA_IPBRR); > + > + /* DMA device info */ > + dev_info(pdma->dev, > + "X-Gene DMA v%d.%02d.%02d driver registered %d channels", > + DMA_REV_NO_RD(val), DMA_BUS_ID_RD(val), > + DMA_DEV_ID_RD(val), DMA_MAX_CHANNEL); > +} > + > +int xgene_dma_init_ring_mngr(struct xgene_dma *pdma) > +{ > + if (ioread32(pdma->csr_ring + DMA_RING_CLKEN) && > + (!ioread32(pdma->csr_ring + DMA_RING_SRST))) > + return 0; > + > + iowrite32(0x3, pdma->csr_ring + DMA_RING_CLKEN); > + iowrite32(0x0, pdma->csr_ring + DMA_RING_SRST); > + > + /* Bring up memory */ > + iowrite32(0x0, pdma->csr_ring + DMA_RING_MEM_RAM_SHUTDOWN); > + > + /* Force a barrier */ > + ioread32(pdma->csr_ring + DMA_RING_MEM_RAM_SHUTDOWN); > + > + /* reset may take up to 1ms */ > + usleep_range(1000, 1100); > + > + if (ioread32(pdma->csr_ring + DMA_RING_BLK_MEM_RDY) > + != 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(DMA_RING_THRESLD0_SET1_VAL, > + pdma->csr_ring + DMA_RING_THRESLD0_SET1); > + iowrite32(DMA_RING_THRESLD1_SET1_VAL, > + pdma->csr_ring + DMA_RING_THRESLD1_SET1); > + iowrite32(DMA_RING_HYSTERESIS_VAL, > + pdma->csr_ring + DMA_RING_HYSTERESIS); > + > + /* Enable QPcore and assign error queue */ > + iowrite32(DMA_RING_ENABLE, pdma->csr_ring + 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 + DMA_MEM_RAM_SHUTDOWN); > + > + /* Force a barrier */ > + ioread32(pdma->csr_dma + DMA_MEM_RAM_SHUTDOWN); > + > + /* reset may take up to 1ms */ > + usleep_range(1000, 1100); > + > + if (ioread32(pdma->csr_dma + DMA_BLK_MEM_RDY) > + != 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 < 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 < 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); > + > + /* 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; > +} > + > +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)\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 " : ""); > + > + return 0; > +} > + > +static int xgene_dma_init_async(struct xgene_dma *pdma) > +{ > + int ret, i, j; > + > + for (i = 0; i < 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 < 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 = DMA_RING_NUM; > + > + for (i = 0; i < DMA_MAX_CHANNEL; i++) { > + chan = &pdma->chan[i]; > + chan->dev = pdma->dev; > + chan->pdma = pdma; > + chan->id = i; > + sprintf(chan->name, "chan%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_byname(pdev, IORESOURCE_MEM, "dma_csr"); > + 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_byname(pdev, IORESOURCE_MEM, "ring_csr"); > + 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_byname(pdev, IORESOURCE_MEM, > + "ring_cmd_csr"); > + 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 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 <= 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 < 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 < 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-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. Thanks, with regards, 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
