> On Oct 29, 2018, at 4:51 AM, Peng Ma <peng...@nxp.com> wrote:
>
>
>
>> -----Original Message-----
>> From: Li Yang <leoyang...@nxp.com>
>> Sent: 2018年10月27日 4:48
>> To: Peng Ma <peng...@nxp.com>
>> Cc: Vinod <vk...@kernel.org>; Rob Herring <robh...@kernel.org>; Mark
>> Rutland <mark.rutl...@arm.com>; Shawn Guo <shawn...@kernel.org>; Dan
>> Williams <dan.j.willi...@intel.com>; dmaeng...@vger.kernel.org; open
>> list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
>> <devicet...@vger.kernel.org>; lkml <linux-ker...@vger.kernel.org>;
>> moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE
>> <linux-arm-ker...@lists.infradead.org>; linuxppc-dev
>> <linuxppc-dev@lists.ozlabs.org>; Wen He <wen.h...@nxp.com>; Jiaheng Fan
>> <jiaheng....@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...@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.h...@nxp.com>
>>> Signed-off-by: Jiaheng Fan <jiaheng....@nxp.com>
>>> Signed-off-by: Peng Ma <peng...@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 "
You can find early versions of this patch in previous SDK releases or the
upstream versions with a google search. These existing copyright claims should
not be removed in the first place.
>
> Best regards
> Peng Ma
>>> +
>>> +/*
>>> + * Driver for NXP Layerscape Queue Direct Memory Access Controller
>>> + *
>>> + * Author:
>>> + * Wen He <wen.h...@nxp.com>
>>> + * Jiaheng Fan <jiaheng....@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
>>>
