[PATCH 3/7] dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs
Peng Ma
peng.ma at nxp.com
Mon Oct 29 20:51:24 AEDT 2018
>-----Original Message-----
>From: Li Yang <leoyang.li at nxp.com>
>Sent: 2018年10月27日 4:48
>To: Peng Ma <peng.ma at nxp.com>
>Cc: Vinod <vkoul at kernel.org>; Rob Herring <robh+dt at kernel.org>; Mark
>Rutland <mark.rutland at arm.com>; Shawn Guo <shawnguo at kernel.org>; Dan
>Williams <dan.j.williams at intel.com>; dmaengine at vger.kernel.org; open
>list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
><devicetree at vger.kernel.org>; lkml <linux-kernel at vger.kernel.org>;
>moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE
><linux-arm-kernel at lists.infradead.org>; linuxppc-dev
><linuxppc-dev at lists.ozlabs.org>; Wen He <wen.he_1 at nxp.com>; Jiaheng Fan
><jiaheng.fan at nxp.com>
>Subject: Re: [PATCH 3/7] dmaengine: fsl-qdma: Add qDMA controller driver for
>Layerscape SoCs
>
>On Fri, Oct 26, 2018 at 4:57 AM Peng Ma <peng.ma at nxp.com> wrote:
>>
>> NXP Queue DMA controller(qDMA) on Layerscape SoCs supports channel
>> virtuallization by allowing DMA jobs to be enqueued into different
>> command queues.
>>
>> Note that this module depends on NXP DPAA.
>
>It is not clear if you are saying that the driver can only work on
>SoCs with a DPAA hardware block, or the driver is actually depending
>on the DPAA drivers also. If it is the later case, you also should
>express that in the Kconfig you added below.
>
[Peng Ma] Ok, I will express it in the Kconfig.
>>
>> Signed-off-by: Wen He <wen.he_1 at nxp.com>
>> Signed-off-by: Jiaheng Fan <jiaheng.fan at nxp.com>
>> Signed-off-by: Peng Ma <peng.ma at nxp.com>
>> ---
>> change in v10:
>> - no
>>
>> drivers/dma/Kconfig | 13 +
>> drivers/dma/Makefile | 1 +
>> drivers/dma/fsl-qdma.c | 1257
>++++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 1271 insertions(+), 0 deletions(-)
>> create mode 100644 drivers/dma/fsl-qdma.c
>>
>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>> index dacf3f4..50e19d7 100644
>> --- a/drivers/dma/Kconfig
>> +++ b/drivers/dma/Kconfig
>> @@ -218,6 +218,19 @@ config FSL_EDMA
>> multiplexing capability for DMA request sources(slot).
>> This module can be found on Freescale Vybrid and LS-1 SoCs.
>>
>> +config FSL_QDMA
>> + tristate "NXP Layerscape qDMA engine support"
>> + depends on ARM || ARM64
>> + select DMA_ENGINE
>> + select DMA_VIRTUAL_CHANNELS
>> + select DMA_ENGINE_RAID
>> + select ASYNC_TX_ENABLE_CHANNEL_SWITCH
>> + help
>> + Support the NXP Layerscape qDMA engine with command queue
>and legacy mode.
>> + Channel virtualization is supported through enqueuing of DMA
>jobs to,
>> + or dequeuing DMA jobs from, different work queues.
>> + This module can be found on NXP Layerscape SoCs.
>> +
>> config FSL_RAID
>> tristate "Freescale RAID engine Support"
>> depends on FSL_SOC
>&& !ASYNC_TX_ENABLE_CHANNEL_SWITCH
>> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
>> index c91702d..2d1b586 100644
>> --- a/drivers/dma/Makefile
>> +++ b/drivers/dma/Makefile
>> @@ -32,6 +32,7 @@ obj-$(CONFIG_DW_DMAC_CORE) += dw/
>> obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
>> obj-$(CONFIG_FSL_DMA) += fsldma.o
>> obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
>> +obj-$(CONFIG_FSL_QDMA) += fsl-qdma.o
>> obj-$(CONFIG_FSL_RAID) += fsl_raid.o
>> obj-$(CONFIG_HSU_DMA) += hsu/
>> obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o
>> diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c
>> new file mode 100644
>> index 0000000..404869e
>> --- /dev/null
>> +++ b/drivers/dma/fsl-qdma.c
>> @@ -0,0 +1,1257 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// Copyright 2018 NXP
>
>I'm not sure if this is really the case. The driver at least has been
>sent out in 2015. We should keep these copyright claims, even the
>legacy Freescale copyright claims.
>
[Peng Ma]
I am not sure this patch sent out in 2015, but the git log earliest shows the patch cteated at Dec 20 2017. so if i changed the "Copyright 2018 NXP" to " Copyright 2017-2018 NXP "
Best regards
Peng Ma
>> +
>> +/*
>> + * Driver for NXP Layerscape Queue Direct Memory Access Controller
>> + *
>> + * Author:
>> + * Wen He <wen.he_1 at nxp.com>
>> + * Jiaheng Fan <jiaheng.fan at nxp.com>
>> + *
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/delay.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_dma.h>
>> +#include <linux/dma-mapping.h>
>> +
>> +#include "virt-dma.h"
>> +#include "fsldma.h"
>> +
>> +/* Register related definition */
>> +#define FSL_QDMA_DMR 0x0
>> +#define FSL_QDMA_DSR 0x4
>> +#define FSL_QDMA_DEIER 0xe00
>> +#define FSL_QDMA_DEDR 0xe04
>> +#define FSL_QDMA_DECFDW0R 0xe10
>> +#define FSL_QDMA_DECFDW1R 0xe14
>> +#define FSL_QDMA_DECFDW2R 0xe18
>> +#define FSL_QDMA_DECFDW3R 0xe1c
>> +#define FSL_QDMA_DECFQIDR 0xe30
>> +#define FSL_QDMA_DECBR 0xe34
>> +
>> +#define FSL_QDMA_BCQMR(x) (0xc0 + 0x100 * (x))
>> +#define FSL_QDMA_BCQSR(x) (0xc4 + 0x100 * (x))
>> +#define FSL_QDMA_BCQEDPA_SADDR(x) (0xc8 + 0x100 * (x))
>> +#define FSL_QDMA_BCQDPA_SADDR(x) (0xcc + 0x100 * (x))
>> +#define FSL_QDMA_BCQEEPA_SADDR(x) (0xd0 + 0x100 * (x))
>> +#define FSL_QDMA_BCQEPA_SADDR(x) (0xd4 + 0x100 * (x))
>> +#define FSL_QDMA_BCQIER(x) (0xe0 + 0x100 * (x))
>> +#define FSL_QDMA_BCQIDR(x) (0xe4 + 0x100 * (x))
>> +
>> +#define FSL_QDMA_SQDPAR 0x80c
>> +#define FSL_QDMA_SQEPAR 0x814
>> +#define FSL_QDMA_BSQMR 0x800
>> +#define FSL_QDMA_BSQSR 0x804
>> +#define FSL_QDMA_BSQICR 0x828
>> +#define FSL_QDMA_CQMR 0xa00
>> +#define FSL_QDMA_CQDSCR1 0xa08
>> +#define FSL_QDMA_CQDSCR2 0xa0c
>> +#define FSL_QDMA_CQIER 0xa10
>> +#define FSL_QDMA_CQEDR 0xa14
>> +#define FSL_QDMA_SQCCMR 0xa20
>> +
>> +/* Registers for bit and genmask */
>> +#define FSL_QDMA_CQIDR_SQT BIT(15)
>> +#define QDMA_CCDF_FOTMAT BIT(29)
>> +#define QDMA_CCDF_SER BIT(30)
>> +#define QDMA_SG_FIN BIT(30)
>> +#define QDMA_SG_LEN_MASK GENMASK(29, 0)
>> +#define QDMA_CCDF_MASK GENMASK(28, 20)
>> +
>> +#define FSL_QDMA_DEDR_CLEAR GENMASK(31, 0)
>> +#define FSL_QDMA_BCQIDR_CLEAR GENMASK(31, 0)
>> +#define FSL_QDMA_DEIER_CLEAR GENMASK(31, 0)
>> +
>> +#define FSL_QDMA_BCQIER_CQTIE BIT(15)
>> +#define FSL_QDMA_BCQIER_CQPEIE BIT(23)
>> +#define FSL_QDMA_BSQICR_ICEN BIT(31)
>> +
>> +#define FSL_QDMA_BSQICR_ICST(x) ((x) << 16)
>> +#define FSL_QDMA_CQIER_MEIE BIT(31)
>> +#define FSL_QDMA_CQIER_TEIE BIT(0)
>> +#define FSL_QDMA_SQCCMR_ENTER_WM BIT(21)
>> +
>> +#define FSL_QDMA_BCQMR_EN BIT(31)
>> +#define FSL_QDMA_BCQMR_EI BIT(30)
>> +#define FSL_QDMA_BCQMR_CD_THLD(x) ((x) << 20)
>> +#define FSL_QDMA_BCQMR_CQ_SIZE(x) ((x) << 16)
>> +
>> +#define FSL_QDMA_BCQSR_QF BIT(16)
>> +#define FSL_QDMA_BCQSR_XOFF BIT(0)
>> +
>> +#define FSL_QDMA_BSQMR_EN BIT(31)
>> +#define FSL_QDMA_BSQMR_DI BIT(30)
>> +#define FSL_QDMA_BSQMR_CQ_SIZE(x) ((x) << 16)
>> +
>> +#define FSL_QDMA_BSQSR_QE BIT(17)
>> +
>> +#define FSL_QDMA_DMR_DQD BIT(30)
>> +#define FSL_QDMA_DSR_DB BIT(31)
>> +
>> +/* Size related definition */
>> +#define FSL_QDMA_QUEUE_MAX 8
>> +#define FSL_QDMA_COMMAND_BUFFER_SIZE 64
>> +#define FSL_QDMA_DESCRIPTOR_BUFFER_SIZE 32
>> +#define FSL_QDMA_CIRCULAR_DESC_SIZE_MIN 64
>> +#define FSL_QDMA_CIRCULAR_DESC_SIZE_MAX 16384
>> +#define FSL_QDMA_QUEUE_NUM_MAX 8
>> +
>> +/* Field definition for CMD */
>> +#define FSL_QDMA_CMD_RWTTYPE 0x4
>> +#define FSL_QDMA_CMD_LWC 0x2
>> +#define FSL_QDMA_CMD_RWTTYPE_OFFSET 28
>> +#define FSL_QDMA_CMD_NS_OFFSET 27
>> +#define FSL_QDMA_CMD_DQOS_OFFSET 24
>> +#define FSL_QDMA_CMD_WTHROTL_OFFSET 20
>> +#define FSL_QDMA_CMD_DSEN_OFFSET 19
>> +#define FSL_QDMA_CMD_LWC_OFFSET 16
>> +
>> +/* Field definition for Descriptor offset */
>> +#define QDMA_CCDF_STATUS 20
>> +#define QDMA_CCDF_OFFSET 20
>> +
>> +/* Field definition for safe loop count*/
>> +#define FSL_QDMA_HALT_COUNT 1500
>> +#define FSL_QDMA_MAX_SIZE 16385
>> +#define FSL_QDMA_COMP_TIMEOUT 1000
>> +#define FSL_COMMAND_QUEUE_OVERFLLOW 10
>> +
>> +#define FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma_engine, x)
>\
>> + (((fsl_qdma_engine)->block_offset) * (x))
>> +
>> +/**
>> + * struct fsl_qdma_format - This is the struct holding describing compound
>> + * descriptor format with qDMA.
>> + * @status: Command status and enqueue status
>notification.
>> + * @cfg: Frame offset and frame format.
>> + * @addr_lo: Holding the compound descriptor of the
>lower
>> + * 32-bits address in memory 40-bit address.
>> + * @addr_hi: Same as above member, but point high
>8-bits in
>> + * memory 40-bit address.
>> + * @__reserved1: Reserved field.
>> + * @cfg8b_w1: Compound descriptor command queue
>origin produced
>> + * by qDMA and dynamic debug field.
>> + * @data Pointer to the memory 40-bit address,
>describes DMA
>> + * source information and DMA destination
>information.
>> + */
>> +struct fsl_qdma_format {
>> + __le32 status;
>> + __le32 cfg;
>> + union {
>> + struct {
>> + __le32 addr_lo;
>> + u8 addr_hi;
>> + u8 __reserved1[2];
>> + u8 cfg8b_w1;
>> + } __packed;
>> + __le64 data;
>> + };
>> +} __packed;
>> +
>> +/* qDMA status notification pre information */
>> +struct fsl_pre_status {
>> + u64 addr;
>> + u8 queue;
>> +};
>> +
>> +static DEFINE_PER_CPU(struct fsl_pre_status, pre);
>> +
>> +struct fsl_qdma_chan {
>> + struct virt_dma_chan vchan;
>> + struct virt_dma_desc vdesc;
>> + enum dma_status status;
>> + struct fsl_qdma_engine *qdma;
>> + struct fsl_qdma_queue *queue;
>> +};
>> +
>> +struct fsl_qdma_queue {
>> + struct fsl_qdma_format *virt_head;
>> + struct fsl_qdma_format *virt_tail;
>> + struct list_head comp_used;
>> + struct list_head comp_free;
>> + struct dma_pool *comp_pool;
>> + struct dma_pool *desc_pool;
>> + spinlock_t queue_lock;
>> + dma_addr_t bus_addr;
>> + u32 n_cq;
>> + u32 id;
>> + struct fsl_qdma_format *cq;
>> + void __iomem *block_base;
>> +};
>> +
>> +struct fsl_qdma_comp {
>> + dma_addr_t bus_addr;
>> + dma_addr_t desc_bus_addr;
>> + struct fsl_qdma_format *virt_addr;
>> + struct fsl_qdma_format *desc_virt_addr;
>> + struct fsl_qdma_chan *qchan;
>> + struct virt_dma_desc vdesc;
>> + struct list_head list;
>> +};
>> +
>> +struct fsl_qdma_engine {
>> + struct dma_device dma_dev;
>> + void __iomem *ctrl_base;
>> + void __iomem *status_base;
>> + void __iomem *block_base;
>> + u32 n_chans;
>> + u32 n_queues;
>> + struct mutex fsl_qdma_mutex;
>> + int error_irq;
>> + int *queue_irq;
>> + u32 feature;
>> + struct fsl_qdma_queue *queue;
>> + struct fsl_qdma_queue **status;
>> + struct fsl_qdma_chan *chans;
>> + int block_number;
>> + int block_offset;
>> + int irq_base;
>> + int desc_allocated;
>> +
>> +};
>> +
>> +static inline u64
>> +qdma_ccdf_addr_get64(const struct fsl_qdma_format *ccdf)
>> +{
>> + return le64_to_cpu(ccdf->data) & (U64_MAX >> 24);
>> +}
>> +
>> +static inline void
>> +qdma_desc_addr_set64(struct fsl_qdma_format *ccdf, u64 addr)
>> +{
>> + ccdf->addr_hi = upper_32_bits(addr);
>> + ccdf->addr_lo = cpu_to_le32(lower_32_bits(addr));
>> +}
>> +
>> +static inline u8
>> +qdma_ccdf_get_queue(const struct fsl_qdma_format *ccdf)
>> +{
>> + return ccdf->cfg8b_w1 & U8_MAX;
>> +}
>> +
>> +static inline int
>> +qdma_ccdf_get_offset(const struct fsl_qdma_format *ccdf)
>> +{
>> + return (le32_to_cpu(ccdf->cfg) & QDMA_CCDF_MASK) >>
>QDMA_CCDF_OFFSET;
>> +}
>> +
>> +static inline void
>> +qdma_ccdf_set_format(struct fsl_qdma_format *ccdf, int offset)
>> +{
>> + ccdf->cfg = cpu_to_le32(QDMA_CCDF_FOTMAT | offset);
>> +}
>> +
>> +static inline int
>> +qdma_ccdf_get_status(const struct fsl_qdma_format *ccdf)
>> +{
>> + return (le32_to_cpu(ccdf->status) & QDMA_CCDF_MASK) >>
>QDMA_CCDF_STATUS;
>> +}
>> +
>> +static inline void
>> +qdma_ccdf_set_ser(struct fsl_qdma_format *ccdf, int status)
>> +{
>> + ccdf->status = cpu_to_le32(QDMA_CCDF_SER | status);
>> +}
>> +
>> +static inline void qdma_csgf_set_len(struct fsl_qdma_format *csgf, int len)
>> +{
>> + csgf->cfg = cpu_to_le32(len & QDMA_SG_LEN_MASK);
>> +}
>> +
>> +static inline void qdma_csgf_set_f(struct fsl_qdma_format *csgf, int len)
>> +{
>> + csgf->cfg = cpu_to_le32(QDMA_SG_FIN | (len &
>QDMA_SG_LEN_MASK));
>> +}
>> +
>> +static u32 qdma_readl(struct fsl_qdma_engine *qdma, void __iomem
>*addr)
>> +{
>> + return FSL_DMA_IN(qdma, addr, 32);
>> +}
>> +
>> +static void qdma_writel(struct fsl_qdma_engine *qdma, u32 val,
>> + void __iomem *addr)
>> +{
>> + FSL_DMA_OUT(qdma, addr, val, 32);
>> +}
>> +
>> +static struct fsl_qdma_chan *to_fsl_qdma_chan(struct dma_chan *chan)
>> +{
>> + return container_of(chan, struct fsl_qdma_chan, vchan.chan);
>> +}
>> +
>> +static struct fsl_qdma_comp *to_fsl_qdma_comp(struct virt_dma_desc *vd)
>> +{
>> + return container_of(vd, struct fsl_qdma_comp, vdesc);
>> +}
>> +
>> +static void fsl_qdma_free_chan_resources(struct dma_chan *chan)
>> +{
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> + struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
>> + struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
>> + struct fsl_qdma_comp *comp_temp, *_comp_temp;
>> + unsigned long flags;
>> + LIST_HEAD(head);
>> +
>> + spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
>> + vchan_get_all_descriptors(&fsl_chan->vchan, &head);
>> + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
>> +
>> + vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
>> +
>> + if (!fsl_queue->comp_pool && !fsl_queue->comp_pool)
>> + return;
>> +
>> + list_for_each_entry_safe(comp_temp, _comp_temp,
>> + &fsl_queue->comp_used, list) {
>> + dma_pool_free(fsl_queue->comp_pool,
>> + comp_temp->virt_addr,
>> + comp_temp->bus_addr);
>> + dma_pool_free(fsl_queue->desc_pool,
>> + comp_temp->desc_virt_addr,
>> + comp_temp->desc_bus_addr);
>> + list_del(&comp_temp->list);
>> + kfree(comp_temp);
>> + }
>> +
>> + list_for_each_entry_safe(comp_temp, _comp_temp,
>> + &fsl_queue->comp_free, list) {
>> + dma_pool_free(fsl_queue->comp_pool,
>> + comp_temp->virt_addr,
>> + comp_temp->bus_addr);
>> + dma_pool_free(fsl_queue->desc_pool,
>> + comp_temp->desc_virt_addr,
>> + comp_temp->desc_bus_addr);
>> + list_del(&comp_temp->list);
>> + kfree(comp_temp);
>> + }
>> +
>> + dma_pool_destroy(fsl_queue->comp_pool);
>> + dma_pool_destroy(fsl_queue->desc_pool);
>> +
>> + fsl_qdma->desc_allocated--;
>> + fsl_queue->comp_pool = NULL;
>> + fsl_queue->desc_pool = NULL;
>> +}
>> +
>> +static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
>> + dma_addr_t dst, dma_addr_t
>src, u32 len)
>> +{
>> + struct fsl_qdma_format *sdf, *ddf;
>> + struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
>> +
>> + ccdf = fsl_comp->virt_addr;
>> + csgf_desc = fsl_comp->virt_addr + 1;
>> + csgf_src = fsl_comp->virt_addr + 2;
>> + csgf_dest = fsl_comp->virt_addr + 3;
>> + sdf = fsl_comp->desc_virt_addr;
>> + ddf = fsl_comp->desc_virt_addr + 1;
>> +
>> + memset(fsl_comp->virt_addr, 0,
>FSL_QDMA_COMMAND_BUFFER_SIZE);
>> + memset(fsl_comp->desc_virt_addr, 0,
>FSL_QDMA_DESCRIPTOR_BUFFER_SIZE);
>> + /* Head Command Descriptor(Frame Descriptor) */
>> + qdma_desc_addr_set64(ccdf, fsl_comp->bus_addr + 16);
>> + qdma_ccdf_set_format(ccdf, qdma_ccdf_get_offset(ccdf));
>> + qdma_ccdf_set_ser(ccdf, qdma_ccdf_get_status(ccdf));
>> + /* Status notification is enqueued to status queue. */
>> + /* Compound Command Descriptor(Frame List Table) */
>> + qdma_desc_addr_set64(csgf_desc, fsl_comp->desc_bus_addr);
>> + /* It must be 32 as Compound S/G Descriptor */
>> + qdma_csgf_set_len(csgf_desc, 32);
>> + qdma_desc_addr_set64(csgf_src, src);
>> + qdma_csgf_set_len(csgf_src, len);
>> + qdma_desc_addr_set64(csgf_dest, dst);
>> + qdma_csgf_set_len(csgf_dest, len);
>> + /* This entry is the last entry. */
>> + qdma_csgf_set_f(csgf_dest, len);
>> + /* Descriptor Buffer */
>> + sdf->data =
>> + cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
>> + FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> + ddf->data =
>> + cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
>> + FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> + ddf->data |=
>> + cpu_to_le64(FSL_QDMA_CMD_LWC <<
>FSL_QDMA_CMD_LWC_OFFSET);
>> +}
>> +
>> +/*
>> + * Pre-request full command descriptor for enqueue.
>> + */
>> +static int fsl_qdma_pre_request_enqueue_desc(struct fsl_qdma_queue
>*queue)
>> +{
>> + int i;
>> + struct fsl_qdma_comp *comp_temp, *_comp_temp;
>> +
>> + for (i = 0; i < queue->n_cq + FSL_COMMAND_QUEUE_OVERFLLOW;
>i++) {
>> + comp_temp = kzalloc(sizeof(*comp_temp),
>GFP_KERNEL);
>> + if (!comp_temp)
>> + goto err_alloc;
>> + comp_temp->virt_addr =
>> + dma_pool_alloc(queue->comp_pool,
>GFP_KERNEL,
>> + &comp_temp->bus_addr);
>> + if (!comp_temp->virt_addr)
>> + goto err_dma_alloc;
>> +
>> + comp_temp->desc_virt_addr =
>> + dma_pool_alloc(queue->desc_pool,
>GFP_KERNEL,
>> +
>&comp_temp->desc_bus_addr);
>> + if (!comp_temp->desc_virt_addr)
>> + goto err_desc_dma_alloc;
>> +
>> + list_add_tail(&comp_temp->list, &queue->comp_free);
>> + }
>> +
>> + return 0;
>> +
>> +err_desc_dma_alloc:
>> + dma_pool_free(queue->comp_pool, comp_temp->virt_addr,
>> + comp_temp->bus_addr);
>> +
>> +err_dma_alloc:
>> + kfree(comp_temp);
>> +
>> +err_alloc:
>> + list_for_each_entry_safe(comp_temp, _comp_temp,
>> + &queue->comp_free, list) {
>> + if (comp_temp->virt_addr)
>> + dma_pool_free(queue->comp_pool,
>> + comp_temp->virt_addr,
>> + comp_temp->bus_addr);
>> + if (comp_temp->desc_virt_addr)
>> + dma_pool_free(queue->desc_pool,
>> + comp_temp->desc_virt_addr,
>> +
>comp_temp->desc_bus_addr);
>> +
>> + list_del(&comp_temp->list);
>> + kfree(comp_temp);
>> + }
>> +
>> + return -ENOMEM;
>> +}
>> +
>> +/*
>> + * Request a command descriptor for enqueue.
>> + */
>> +static struct fsl_qdma_comp
>> +*fsl_qdma_request_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
>> +{
>> + unsigned long flags;
>> + struct fsl_qdma_comp *comp_temp;
>> + int timeout = FSL_QDMA_COMP_TIMEOUT;
>> + struct fsl_qdma_queue *queue = fsl_chan->queue;
>> +
>> + while (timeout--) {
>> + spin_lock_irqsave(&queue->queue_lock, flags);
>> + if (!list_empty(&queue->comp_free)) {
>> + comp_temp =
>list_first_entry(&queue->comp_free,
>> + struct
>fsl_qdma_comp,
>> + list);
>> + list_del(&comp_temp->list);
>> +
>> + spin_unlock_irqrestore(&queue->queue_lock,
>flags);
>> + comp_temp->qchan = fsl_chan;
>> + return comp_temp;
>> + }
>> + spin_unlock_irqrestore(&queue->queue_lock, flags);
>> + udelay(1);
>> + }
>> +
>> + return NULL;
>> +}
>> +
>> +static struct fsl_qdma_queue
>> +*fsl_qdma_alloc_queue_resources(struct platform_device *pdev,
>> + struct fsl_qdma_engine *fsl_qdma)
>> +{
>> + int ret, len, i, j;
>> + int queue_num, block_number;
>> + unsigned int queue_size[FSL_QDMA_QUEUE_MAX];
>> + struct fsl_qdma_queue *queue_head, *queue_temp;
>> +
>> + queue_num = fsl_qdma->n_queues;
>> + block_number = fsl_qdma->block_number;
>> +
>> + if (queue_num > FSL_QDMA_QUEUE_MAX)
>> + queue_num = FSL_QDMA_QUEUE_MAX;
>> + len = sizeof(*queue_head) * queue_num * block_number;
>> + queue_head = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
>> + if (!queue_head)
>> + return NULL;
>> +
>> + ret = device_property_read_u32_array(&pdev->dev, "queue-sizes",
>> + queue_size,
>queue_num);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get queue-sizes.\n");
>> + return NULL;
>> + }
>> + for (j = 0; j < block_number; j++) {
>> + for (i = 0; i < queue_num; i++) {
>> + if (queue_size[i] >
>FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
>> + queue_size[i] <
>FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
>> + dev_err(&pdev->dev,
>> + "Get wrong
>queue-sizes.\n");
>> + return NULL;
>> + }
>> + queue_temp = queue_head + i + (j *
>queue_num);
>> +
>> + queue_temp->cq =
>> + dma_alloc_coherent(&pdev->dev,
>> + sizeof(struct
>fsl_qdma_format) *
>> + queue_size[i],
>> +
>&queue_temp->bus_addr,
>> + GFP_KERNEL);
>> + if (!queue_temp->cq)
>> + return NULL;
>> + queue_temp->block_base =
>fsl_qdma->block_base +
>> +
>FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
>> + queue_temp->n_cq = queue_size[i];
>> + queue_temp->id = i;
>> + queue_temp->virt_head = queue_temp->cq;
>> + queue_temp->virt_tail = queue_temp->cq;
>> + /*
>> + * List for queue command buffer
>> + */
>> + INIT_LIST_HEAD(&queue_temp->comp_used);
>> + spin_lock_init(&queue_temp->queue_lock);
>> + }
>> + }
>> + return queue_head;
>> +}
>> +
>> +static struct fsl_qdma_queue
>> +*fsl_qdma_prep_status_queue(struct platform_device *pdev)
>> +{
>> + int ret;
>> + unsigned int status_size;
>> + struct fsl_qdma_queue *status_head;
>> + struct device_node *np = pdev->dev.of_node;
>> +
>> + ret = of_property_read_u32(np, "status-sizes", &status_size);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get status-sizes.\n");
>> + return NULL;
>> + }
>> + if (status_size > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
>> + status_size < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
>> + dev_err(&pdev->dev, "Get wrong status_size.\n");
>> + return NULL;
>> + }
>> + status_head = devm_kzalloc(&pdev->dev,
>> + sizeof(*status_head),
>GFP_KERNEL);
>> + if (!status_head)
>> + return NULL;
>> +
>> + /*
>> + * Buffer for queue command
>> + */
>> + status_head->cq = dma_alloc_coherent(&pdev->dev,
>> + sizeof(struct
>fsl_qdma_format) *
>> + status_size,
>> +
>&status_head->bus_addr,
>> + GFP_KERNEL);
>> + if (!status_head->cq) {
>> + devm_kfree(&pdev->dev, status_head);
>> + return NULL;
>> + }
>> + status_head->n_cq = status_size;
>> + status_head->virt_head = status_head->cq;
>> + status_head->virt_tail = status_head->cq;
>> + status_head->comp_pool = NULL;
>> +
>> + return status_head;
>> +}
>> +
>> +static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma)
>> +{
>> + u32 reg;
>> + int i, j, count = FSL_QDMA_HALT_COUNT;
>> + void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
>> +
>> + /* Disable the command queue and wait for idle state. */
>> + reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
>> + reg |= FSL_QDMA_DMR_DQD;
>> + qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
>> + for (j = 0; j < fsl_qdma->block_number; j++) {
>> + block = fsl_qdma->block_base +
>> + FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
>> + for (i = 0; i < FSL_QDMA_QUEUE_NUM_MAX; i++)
>> + qdma_writel(fsl_qdma, 0, block +
>FSL_QDMA_BCQMR(i));
>> + }
>> + while (1) {
>> + reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DSR);
>> + if (!(reg & FSL_QDMA_DSR_DB))
>> + break;
>> + if (count-- < 0)
>> + return -EBUSY;
>> + udelay(100);
>> + }
>> +
>> + for (j = 0; j < fsl_qdma->block_number; j++) {
>> + block = fsl_qdma->block_base +
>> + FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
>> +
>> + /* Disable status queue. */
>> + qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BSQMR);
>> +
>> + /*
>> + * clear the command queue interrupt detect register for
>> + * all queues.
>> + */
>> + qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
>> + block + FSL_QDMA_BCQIDR(0));
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int
>> +fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
>> + void *block,
>> + int id)
>> +{
>> + bool duplicate;
>> + u32 reg, i, count;
>> + struct fsl_qdma_queue *temp_queue;
>> + struct fsl_qdma_format *status_addr;
>> + struct fsl_qdma_comp *fsl_comp = NULL;
>> + struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
>> + struct fsl_qdma_queue *fsl_status = fsl_qdma->status[id];
>> +
>> + count = FSL_QDMA_MAX_SIZE;
>> +
>> + while (count--) {
>> + duplicate = 0;
>> + reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQSR);
>> + if (reg & FSL_QDMA_BSQSR_QE)
>> + return 0;
>> +
>> + status_addr = fsl_status->virt_head;
>> +
>> + if (qdma_ccdf_get_queue(status_addr) ==
>> + __this_cpu_read(pre.queue) &&
>> + qdma_ccdf_addr_get64(status_addr) ==
>> + __this_cpu_read(pre.addr))
>> + duplicate = 1;
>> + i = qdma_ccdf_get_queue(status_addr) +
>> + id * fsl_qdma->n_queues;
>> + __this_cpu_write(pre.addr,
>qdma_ccdf_addr_get64(status_addr));
>> + __this_cpu_write(pre.queue,
>qdma_ccdf_get_queue(status_addr));
>> + temp_queue = fsl_queue + i;
>> +
>> + spin_lock(&temp_queue->queue_lock);
>> + if (list_empty(&temp_queue->comp_used)) {
>> + if (!duplicate) {
>> +
>spin_unlock(&temp_queue->queue_lock);
>> + return -EAGAIN;
>> + }
>> + } else {
>> + fsl_comp =
>list_first_entry(&temp_queue->comp_used,
>> + struct
>fsl_qdma_comp, list);
>> + if (fsl_comp->bus_addr + 16 !=
>> + __this_cpu_read(pre.addr)) {
>> + if (!duplicate) {
>> +
>spin_unlock(&temp_queue->queue_lock);
>> + return -EAGAIN;
>> + }
>> + }
>> + }
>> +
>> + if (duplicate) {
>> + reg = qdma_readl(fsl_qdma, block +
>FSL_QDMA_BSQMR);
>> + reg |= FSL_QDMA_BSQMR_DI;
>> + qdma_desc_addr_set64(status_addr, 0x0);
>> + fsl_status->virt_head++;
>> + if (fsl_status->virt_head == fsl_status->cq
>> + +
>fsl_status->n_cq)
>> + fsl_status->virt_head =
>fsl_status->cq;
>> + qdma_writel(fsl_qdma, reg, block +
>FSL_QDMA_BSQMR);
>> + spin_unlock(&temp_queue->queue_lock);
>> + continue;
>> + }
>> + list_del(&fsl_comp->list);
>> +
>> + reg = qdma_readl(fsl_qdma, block +
>FSL_QDMA_BSQMR);
>> + reg |= FSL_QDMA_BSQMR_DI;
>> + qdma_desc_addr_set64(status_addr, 0x0);
>> + fsl_status->virt_head++;
>> + if (fsl_status->virt_head == fsl_status->cq +
>fsl_status->n_cq)
>> + fsl_status->virt_head = fsl_status->cq;
>> + qdma_writel(fsl_qdma, reg, block +
>FSL_QDMA_BSQMR);
>> + spin_unlock(&temp_queue->queue_lock);
>> +
>> + spin_lock(&fsl_comp->qchan->vchan.lock);
>> + vchan_cookie_complete(&fsl_comp->vdesc);
>> + fsl_comp->qchan->status = DMA_COMPLETE;
>> + spin_unlock(&fsl_comp->qchan->vchan.lock);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static irqreturn_t fsl_qdma_error_handler(int irq, void *dev_id)
>> +{
>> + unsigned int intr;
>> + struct fsl_qdma_engine *fsl_qdma = dev_id;
>> + void __iomem *status = fsl_qdma->status_base;
>> +
>> + intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
>> +
>> + if (intr) {
>> + dev_err(fsl_qdma->dma_dev.dev, "DMA transaction
>error!\n");
>> + return IRQ_NONE;
>> + }
>> +
>> + qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status +
>FSL_QDMA_DEDR);
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static irqreturn_t fsl_qdma_queue_handler(int irq, void *dev_id)
>> +{
>> + int id;
>> + unsigned int intr, reg;
>> + struct fsl_qdma_engine *fsl_qdma = dev_id;
>> + void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
>> +
>> + id = irq - fsl_qdma->irq_base;
>> + if (id < 0 && id > fsl_qdma->block_number) {
>> + dev_err(fsl_qdma->dma_dev.dev,
>> + "irq %d is wrong irq_base is %d\n",
>> + irq, fsl_qdma->irq_base);
>> + }
>> +
>> + block = fsl_qdma->block_base +
>> + FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, id);
>> +
>> + intr = qdma_readl(fsl_qdma, block + FSL_QDMA_BCQIDR(0));
>> +
>> + if ((intr & FSL_QDMA_CQIDR_SQT) != 0)
>> + intr = fsl_qdma_queue_transfer_complete(fsl_qdma,
>block, id);
>> +
>> + if (intr != 0) {
>> + reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
>> + reg |= FSL_QDMA_DMR_DQD;
>> + qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
>> + qdma_writel(fsl_qdma, 0, block +
>FSL_QDMA_BCQIER(0));
>> + dev_err(fsl_qdma->dma_dev.dev, "QDMA: status
>err!\n");
>> + }
>> +
>> + /* Clear all detected events and interrupts. */
>> + qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
>> + block + FSL_QDMA_BCQIDR(0));
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int
>> +fsl_qdma_irq_init(struct platform_device *pdev,
>> + struct fsl_qdma_engine *fsl_qdma)
>> +{
>> + int i;
>> + int cpu;
>> + int ret;
>> + char irq_name[20];
>> +
>> + fsl_qdma->error_irq =
>> + platform_get_irq_byname(pdev, "qdma-error");
>> + if (fsl_qdma->error_irq < 0) {
>> + dev_err(&pdev->dev, "Can't get qdma controller irq.\n");
>> + return fsl_qdma->error_irq;
>> + }
>> +
>> + ret = devm_request_irq(&pdev->dev, fsl_qdma->error_irq,
>> + fsl_qdma_error_handler, 0,
>> + "qDMA error", fsl_qdma);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't register qDMA controller
>IRQ.\n");
>> + return ret;
>> + }
>> +
>> + for (i = 0; i < fsl_qdma->block_number; i++) {
>> + sprintf(irq_name, "qdma-queue%d", i);
>> + fsl_qdma->queue_irq[i] =
>> + platform_get_irq_byname(pdev,
>irq_name);
>> +
>> + if (fsl_qdma->queue_irq[i] < 0) {
>> + dev_err(&pdev->dev,
>> + "Can't get qdma queue %d irq.\n", i);
>> + return fsl_qdma->queue_irq[i];
>> + }
>> +
>> + ret = devm_request_irq(&pdev->dev,
>> + fsl_qdma->queue_irq[i],
>> + fsl_qdma_queue_handler,
>> + 0,
>> + "qDMA queue",
>> + fsl_qdma);
>> + if (ret) {
>> + dev_err(&pdev->dev,
>> + "Can't register qDMA queue
>IRQ.\n");
>> + return ret;
>> + }
>> +
>> + cpu = i % num_online_cpus();
>> + ret = irq_set_affinity_hint(fsl_qdma->queue_irq[i],
>> + get_cpu_mask(cpu));
>> + if (ret) {
>> + dev_err(&pdev->dev,
>> + "Can't set cpu %d affinity to
>IRQ %d.\n",
>> + cpu,
>> + fsl_qdma->queue_irq[i]);
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void fsl_qdma_irq_exit(struct platform_device *pdev,
>> + struct fsl_qdma_engine *fsl_qdma)
>> +{
>> + int i;
>> +
>> + devm_free_irq(&pdev->dev, fsl_qdma->error_irq, fsl_qdma);
>> + for (i = 0; i < fsl_qdma->block_number; i++)
>> + devm_free_irq(&pdev->dev, fsl_qdma->queue_irq[i],
>fsl_qdma);
>> +}
>> +
>> +static int fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma)
>> +{
>> + u32 reg;
>> + int i, j, ret;
>> + struct fsl_qdma_queue *temp;
>> + void __iomem *status = fsl_qdma->status_base;
>> + void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
>> + struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
>> +
>> + /* Try to halt the qDMA engine first. */
>> + ret = fsl_qdma_halt(fsl_qdma);
>> + if (ret) {
>> + dev_err(fsl_qdma->dma_dev.dev, "DMA halt failed!");
>> + return ret;
>> + }
>> +
>> + for (i = 0; i < fsl_qdma->block_number; i++) {
>> + /*
>> + * Clear the command queue interrupt detect register
>for
>> + * all queues.
>> + */
>> +
>> + block = fsl_qdma->block_base +
>> + FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, i);
>> + qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
>> + block + FSL_QDMA_BCQIDR(0));
>> + }
>> +
>> + for (j = 0; j < fsl_qdma->block_number; j++) {
>> + block = fsl_qdma->block_base +
>> + FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
>> + for (i = 0; i < fsl_qdma->n_queues; i++) {
>> + temp = fsl_queue + i + (j *
>fsl_qdma->n_queues);
>> + /*
>> + * Initialize Command Queue registers to
>> + * point to the first
>> + * command descriptor in memory.
>> + * Dequeue Pointer Address Registers
>> + * Enqueue Pointer Address Registers
>> + */
>> +
>> + qdma_writel(fsl_qdma, temp->bus_addr,
>> + block +
>FSL_QDMA_BCQDPA_SADDR(i));
>> + qdma_writel(fsl_qdma, temp->bus_addr,
>> + block +
>FSL_QDMA_BCQEPA_SADDR(i));
>> +
>> + /* Initialize the queue mode. */
>> + reg = FSL_QDMA_BCQMR_EN;
>> + reg |=
>FSL_QDMA_BCQMR_CD_THLD(ilog2(temp->n_cq) - 4);
>> + reg |=
>FSL_QDMA_BCQMR_CQ_SIZE(ilog2(temp->n_cq) - 6);
>> + qdma_writel(fsl_qdma, reg, block +
>FSL_QDMA_BCQMR(i));
>> + }
>> +
>> + /*
>> + * Workaround for erratum: ERR010812.
>> + * We must enable XOFF to avoid the enqueue rejection
>occurs.
>> + * Setting SQCCMR ENTER_WM to 0x20.
>> + */
>> +
>> + qdma_writel(fsl_qdma,
>FSL_QDMA_SQCCMR_ENTER_WM,
>> + block + FSL_QDMA_SQCCMR);
>> +
>> + /*
>> + * Initialize status queue registers to point to the first
>> + * command descriptor in memory.
>> + * Dequeue Pointer Address Registers
>> + * Enqueue Pointer Address Registers
>> + */
>> +
>> + qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
>> + block + FSL_QDMA_SQEPAR);
>> + qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
>> + block + FSL_QDMA_SQDPAR);
>> + /* Initialize status queue interrupt. */
>> + qdma_writel(fsl_qdma, FSL_QDMA_BCQIER_CQTIE,
>> + block + FSL_QDMA_BCQIER(0));
>> + qdma_writel(fsl_qdma, FSL_QDMA_BSQICR_ICEN |
>> + FSL_QDMA_BSQICR_ICST(5) |
>0x8000,
>> + block + FSL_QDMA_BSQICR);
>> + qdma_writel(fsl_qdma, FSL_QDMA_CQIER_MEIE |
>> + FSL_QDMA_CQIER_TEIE,
>> + block + FSL_QDMA_CQIER);
>> +
>> + /* Initialize the status queue mode. */
>> + reg = FSL_QDMA_BSQMR_EN;
>> + reg |= FSL_QDMA_BSQMR_CQ_SIZE(ilog2
>> + (fsl_qdma->status[j]->n_cq) - 6);
>> +
>> + qdma_writel(fsl_qdma, reg, block +
>FSL_QDMA_BSQMR);
>> + reg = qdma_readl(fsl_qdma, block +
>FSL_QDMA_BSQMR);
>> + }
>> +
>> + /* Initialize controller interrupt register. */
>> + qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status +
>FSL_QDMA_DEDR);
>> + qdma_writel(fsl_qdma, FSL_QDMA_DEIER_CLEAR, status +
>FSL_QDMA_DEIER);
>> +
>> + reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
>> + reg &= ~FSL_QDMA_DMR_DQD;
>> + qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
>> +
>> + return 0;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *
>> +fsl_qdma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst,
>> + dma_addr_t src, size_t len, unsigned long flags)
>> +{
>> + struct fsl_qdma_comp *fsl_comp;
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> +
>> + fsl_comp = fsl_qdma_request_enqueue_desc(fsl_chan);
>> +
>> + if (!fsl_comp)
>> + return NULL;
>> +
>> + fsl_qdma_comp_fill_memcpy(fsl_comp, dst, src, len);
>> +
>> + return vchan_tx_prep(&fsl_chan->vchan, &fsl_comp->vdesc, flags);
>> +}
>> +
>> +static void fsl_qdma_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
>> +{
>> + u32 reg;
>> + struct virt_dma_desc *vdesc;
>> + struct fsl_qdma_comp *fsl_comp;
>> + struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
>> + void __iomem *block = fsl_queue->block_base;
>> +
>> + reg = qdma_readl(fsl_chan->qdma, block +
>FSL_QDMA_BCQSR(fsl_queue->id));
>> + if (reg & (FSL_QDMA_BCQSR_QF | FSL_QDMA_BCQSR_XOFF))
>> + return;
>> + vdesc = vchan_next_desc(&fsl_chan->vchan);
>> + if (!vdesc)
>> + return;
>> + list_del(&vdesc->node);
>> + fsl_comp = to_fsl_qdma_comp(vdesc);
>> +
>> + memcpy(fsl_queue->virt_head++,
>> + fsl_comp->virt_addr, sizeof(struct fsl_qdma_format));
>> + if (fsl_queue->virt_head == fsl_queue->cq + fsl_queue->n_cq)
>> + fsl_queue->virt_head = fsl_queue->cq;
>> +
>> + list_add_tail(&fsl_comp->list, &fsl_queue->comp_used);
>> + barrier();
>> + reg = qdma_readl(fsl_chan->qdma, block +
>FSL_QDMA_BCQMR(fsl_queue->id));
>> + reg |= FSL_QDMA_BCQMR_EI;
>> + qdma_writel(fsl_chan->qdma, reg, block +
>FSL_QDMA_BCQMR(fsl_queue->id));
>> + fsl_chan->status = DMA_IN_PROGRESS;
>> +}
>> +
>> +static void fsl_qdma_free_desc(struct virt_dma_desc *vdesc)
>> +{
>> + unsigned long flags;
>> + struct fsl_qdma_comp *fsl_comp;
>> + struct fsl_qdma_queue *fsl_queue;
>> +
>> + fsl_comp = to_fsl_qdma_comp(vdesc);
>> + fsl_queue = fsl_comp->qchan->queue;
>> +
>> + spin_lock_irqsave(&fsl_queue->queue_lock, flags);
>> + list_add_tail(&fsl_comp->list, &fsl_queue->comp_free);
>> + spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
>> +}
>> +
>> +static void fsl_qdma_issue_pending(struct dma_chan *chan)
>> +{
>> + unsigned long flags;
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> + struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
>> +
>> + spin_lock_irqsave(&fsl_queue->queue_lock, flags);
>> + spin_lock(&fsl_chan->vchan.lock);
>> + if (vchan_issue_pending(&fsl_chan->vchan))
>> + fsl_qdma_enqueue_desc(fsl_chan);
>> + spin_unlock(&fsl_chan->vchan.lock);
>> + spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
>> +}
>> +
>> +static void fsl_qdma_synchronize(struct dma_chan *chan)
>> +{
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> +
>> + vchan_synchronize(&fsl_chan->vchan);
>> +}
>> +
>> +static int fsl_qdma_terminate_all(struct dma_chan *chan)
>> +{
>> + LIST_HEAD(head);
>> + unsigned long flags;
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> +
>> + spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
>> + vchan_get_all_descriptors(&fsl_chan->vchan, &head);
>> + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
>> + vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
>> + return 0;
>> +}
>> +
>> +static int fsl_qdma_alloc_chan_resources(struct dma_chan *chan)
>> +{
>> + int ret;
>> + struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
>> + struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
>> + struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
>> +
>> + if (fsl_queue->comp_pool && fsl_queue->desc_pool)
>> + return fsl_qdma->desc_allocated;
>> +
>> + INIT_LIST_HEAD(&fsl_queue->comp_free);
>> +
>> + /*
>> + * The dma pool for queue command buffer
>> + */
>> + fsl_queue->comp_pool =
>> + dma_pool_create("comp_pool",
>> + chan->device->dev,
>> + FSL_QDMA_COMMAND_BUFFER_SIZE,
>> + 64, 0);
>> + if (!fsl_queue->comp_pool)
>> + return -ENOMEM;
>> +
>> + /*
>> + * The dma pool for Descriptor(SD/DD) buffer
>> + */
>> + fsl_queue->desc_pool =
>> + dma_pool_create("desc_pool",
>> + chan->device->dev,
>> + FSL_QDMA_DESCRIPTOR_BUFFER_SIZE,
>> + 32, 0);
>> + if (!fsl_queue->desc_pool)
>> + goto err_desc_pool;
>> +
>> + ret = fsl_qdma_pre_request_enqueue_desc(fsl_queue);
>> + if (ret) {
>> + dev_err(chan->device->dev,
>> + "failed to alloc dma buffer for S/G
>descriptor\n");
>> + goto err_mem;
>> + }
>> +
>> + fsl_qdma->desc_allocated++;
>> + return fsl_qdma->desc_allocated;
>> +
>> +err_mem:
>> + dma_pool_destroy(fsl_queue->desc_pool);
>> +err_desc_pool:
>> + dma_pool_destroy(fsl_queue->comp_pool);
>> + return -ENOMEM;
>> +}
>> +
>> +static int fsl_qdma_probe(struct platform_device *pdev)
>> +{
>> + int ret, i;
>> + int blk_num, blk_off;
>> + u32 len, chans, queues;
>> + struct resource *res;
>> + struct fsl_qdma_chan *fsl_chan;
>> + struct fsl_qdma_engine *fsl_qdma;
>> + struct device_node *np = pdev->dev.of_node;
>> +
>> + ret = of_property_read_u32(np, "dma-channels", &chans);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get dma-channels.\n");
>> + return ret;
>> + }
>> +
>> + ret = of_property_read_u32(np, "block-offset", &blk_off);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get block-offset.\n");
>> + return ret;
>> + }
>> +
>> + ret = of_property_read_u32(np, "block-number", &blk_num);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get block-number.\n");
>> + return ret;
>> + }
>> +
>> + blk_num = min_t(int, blk_num, num_online_cpus());
>> +
>> + len = sizeof(*fsl_qdma);
>> + fsl_qdma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
>> + if (!fsl_qdma)
>> + return -ENOMEM;
>> +
>> + len = sizeof(*fsl_chan) * chans;
>> + fsl_qdma->chans = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
>> + if (!fsl_qdma->chans)
>> + return -ENOMEM;
>> +
>> + len = sizeof(struct fsl_qdma_queue *) * blk_num;
>> + fsl_qdma->status = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
>> + if (!fsl_qdma->status)
>> + return -ENOMEM;
>> +
>> + len = sizeof(int) * blk_num;
>> + fsl_qdma->queue_irq = devm_kzalloc(&pdev->dev, len,
>GFP_KERNEL);
>> + if (!fsl_qdma->queue_irq)
>> + return -ENOMEM;
>> +
>> + ret = of_property_read_u32(np, "fsl,dma-queues", &queues);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't get queues.\n");
>> + return ret;
>> + }
>> +
>> + fsl_qdma->desc_allocated = 0;
>> + fsl_qdma->n_chans = chans;
>> + fsl_qdma->n_queues = queues;
>> + fsl_qdma->block_number = blk_num;
>> + fsl_qdma->block_offset = blk_off;
>> +
>> + mutex_init(&fsl_qdma->fsl_qdma_mutex);
>> +
>> + for (i = 0; i < fsl_qdma->block_number; i++) {
>> + fsl_qdma->status[i] =
>fsl_qdma_prep_status_queue(pdev);
>> + if (!fsl_qdma->status[i])
>> + return -ENOMEM;
>> + }
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + fsl_qdma->ctrl_base = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(fsl_qdma->ctrl_base))
>> + return PTR_ERR(fsl_qdma->ctrl_base);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> + fsl_qdma->status_base = devm_ioremap_resource(&pdev->dev,
>res);
>> + if (IS_ERR(fsl_qdma->status_base))
>> + return PTR_ERR(fsl_qdma->status_base);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
>> + fsl_qdma->block_base = devm_ioremap_resource(&pdev->dev,
>res);
>> + if (IS_ERR(fsl_qdma->block_base))
>> + return PTR_ERR(fsl_qdma->block_base);
>> + fsl_qdma->queue = fsl_qdma_alloc_queue_resources(pdev,
>fsl_qdma);
>> + if (!fsl_qdma->queue)
>> + return -ENOMEM;
>> +
>> + ret = fsl_qdma_irq_init(pdev, fsl_qdma);
>> + if (ret)
>> + return ret;
>> +
>> + fsl_qdma->irq_base = platform_get_irq_byname(pdev,
>"qdma-queue0");
>> + fsl_qdma->feature = of_property_read_bool(np, "big-endian");
>> + INIT_LIST_HEAD(&fsl_qdma->dma_dev.channels);
>> +
>> + for (i = 0; i < fsl_qdma->n_chans; i++) {
>> + struct fsl_qdma_chan *fsl_chan = &fsl_qdma->chans[i];
>> +
>> + fsl_chan->qdma = fsl_qdma;
>> + fsl_chan->queue = fsl_qdma->queue + i %
>(fsl_qdma->n_queues *
>> +
>fsl_qdma->block_number);
>> + fsl_chan->vchan.desc_free = fsl_qdma_free_desc;
>> + vchan_init(&fsl_chan->vchan, &fsl_qdma->dma_dev);
>> + }
>> +
>> + dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
>> +
>> + fsl_qdma->dma_dev.dev = &pdev->dev;
>> + fsl_qdma->dma_dev.device_free_chan_resources =
>> + fsl_qdma_free_chan_resources;
>> + fsl_qdma->dma_dev.device_alloc_chan_resources =
>> + fsl_qdma_alloc_chan_resources;
>> + fsl_qdma->dma_dev.device_tx_status = dma_cookie_status;
>> + fsl_qdma->dma_dev.device_prep_dma_memcpy =
>fsl_qdma_prep_memcpy;
>> + fsl_qdma->dma_dev.device_issue_pending =
>fsl_qdma_issue_pending;
>> + fsl_qdma->dma_dev.device_synchronize = fsl_qdma_synchronize;
>> + fsl_qdma->dma_dev.device_terminate_all =
>fsl_qdma_terminate_all;
>> +
>> + dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
>> +
>> + platform_set_drvdata(pdev, fsl_qdma);
>> +
>> + ret = dma_async_device_register(&fsl_qdma->dma_dev);
>> + if (ret) {
>> + dev_err(&pdev->dev,
>> + "Can't register NXP Layerscape qDMA
>engine.\n");
>> + return ret;
>> + }
>> +
>> + ret = fsl_qdma_reg_init(fsl_qdma);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Can't Initialize the qDMA
>engine.\n");
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void fsl_qdma_cleanup_vchan(struct dma_device *dmadev)
>> +{
>> + struct fsl_qdma_chan *chan, *_chan;
>> +
>> + list_for_each_entry_safe(chan, _chan,
>> + &dmadev->channels,
>vchan.chan.device_node) {
>> + list_del(&chan->vchan.chan.device_node);
>> + tasklet_kill(&chan->vchan.task);
>> + }
>> +}
>> +
>> +static int fsl_qdma_remove(struct platform_device *pdev)
>> +{
>> + int i;
>> + struct fsl_qdma_queue *status;
>> + struct device_node *np = pdev->dev.of_node;
>> + struct fsl_qdma_engine *fsl_qdma = platform_get_drvdata(pdev);
>> +
>> + fsl_qdma_irq_exit(pdev, fsl_qdma);
>> + fsl_qdma_cleanup_vchan(&fsl_qdma->dma_dev);
>> + of_dma_controller_free(np);
>> + dma_async_device_unregister(&fsl_qdma->dma_dev);
>> +
>> + for (i = 0; i < fsl_qdma->block_number; i++) {
>> + status = fsl_qdma->status[i];
>> + dma_free_coherent(&pdev->dev, sizeof(struct
>fsl_qdma_format) *
>> + status->n_cq, status->cq,
>status->bus_addr);
>> + }
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id fsl_qdma_dt_ids[] = {
>> + { .compatible = "fsl,ls1021a-qdma", },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, fsl_qdma_dt_ids);
>> +
>> +static struct platform_driver fsl_qdma_driver = {
>> + .driver = {
>> + .name = "fsl-qdma",
>> + .of_match_table = fsl_qdma_dt_ids,
>> + },
>> + .probe = fsl_qdma_probe,
>> + .remove = fsl_qdma_remove,
>> +};
>> +
>> +module_platform_driver(fsl_qdma_driver);
>> +
>> +MODULE_ALIAS("platform:fsl-qdma");
>> +MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");
>> --
>> 1.7.1
>>
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