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dmaengine: sprd: Add Spreadtrum DMA driver
This patch adds the DMA controller driver for Spreadtrum SC9860 platform. Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Baolin Wang
Vinod Koul
parent
ea09ec8c44
commit
9b3b8171f7
3 changed files with 997 additions and 0 deletions
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@ -483,6 +483,14 @@ config STM32_DMA
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If you have a board based on such a MCU and wish to use DMA say Y
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here.
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config SPRD_DMA
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tristate "Spreadtrum DMA support"
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depends on ARCH_SPRD || COMPILE_TEST
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select DMA_ENGINE
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select DMA_VIRTUAL_CHANNELS
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help
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Enable support for the on-chip DMA controller on Spreadtrum platform.
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config S3C24XX_DMAC
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bool "Samsung S3C24XX DMA support"
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depends on ARCH_S3C24XX || COMPILE_TEST
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@ -59,6 +59,7 @@ obj-$(CONFIG_RENESAS_DMA) += sh/
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obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
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obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
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obj-$(CONFIG_STM32_DMA) += stm32-dma.o
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obj-$(CONFIG_SPRD_DMA) += sprd-dma.o
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obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
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obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
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obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
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988
drivers/dma/sprd-dma.c
Normal file
988
drivers/dma/sprd-dma.c
Normal file
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@ -0,0 +1,988 @@
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/*
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* Copyright (C) 2017 Spreadtrum Communications Inc.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_dma.h>
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#include <linux/of_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include "virt-dma.h"
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#define SPRD_DMA_CHN_REG_OFFSET 0x1000
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#define SPRD_DMA_CHN_REG_LENGTH 0x40
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#define SPRD_DMA_MEMCPY_MIN_SIZE 64
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/* DMA global registers definition */
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#define SPRD_DMA_GLB_PAUSE 0x0
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#define SPRD_DMA_GLB_FRAG_WAIT 0x4
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#define SPRD_DMA_GLB_REQ_PEND0_EN 0x8
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#define SPRD_DMA_GLB_REQ_PEND1_EN 0xc
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#define SPRD_DMA_GLB_INT_RAW_STS 0x10
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#define SPRD_DMA_GLB_INT_MSK_STS 0x14
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#define SPRD_DMA_GLB_REQ_STS 0x18
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#define SPRD_DMA_GLB_CHN_EN_STS 0x1c
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#define SPRD_DMA_GLB_DEBUG_STS 0x20
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#define SPRD_DMA_GLB_ARB_SEL_STS 0x24
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#define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1))
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#define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000
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/* DMA channel registers definition */
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#define SPRD_DMA_CHN_PAUSE 0x0
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#define SPRD_DMA_CHN_REQ 0x4
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#define SPRD_DMA_CHN_CFG 0x8
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#define SPRD_DMA_CHN_INTC 0xc
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#define SPRD_DMA_CHN_SRC_ADDR 0x10
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#define SPRD_DMA_CHN_DES_ADDR 0x14
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#define SPRD_DMA_CHN_FRG_LEN 0x18
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#define SPRD_DMA_CHN_BLK_LEN 0x1c
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#define SPRD_DMA_CHN_TRSC_LEN 0x20
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#define SPRD_DMA_CHN_TRSF_STEP 0x24
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#define SPRD_DMA_CHN_WARP_PTR 0x28
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#define SPRD_DMA_CHN_WARP_TO 0x2c
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#define SPRD_DMA_CHN_LLIST_PTR 0x30
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#define SPRD_DMA_CHN_FRAG_STEP 0x34
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#define SPRD_DMA_CHN_SRC_BLK_STEP 0x38
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#define SPRD_DMA_CHN_DES_BLK_STEP 0x3c
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/* SPRD_DMA_CHN_INTC register definition */
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#define SPRD_DMA_INT_MASK GENMASK(4, 0)
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#define SPRD_DMA_INT_CLR_OFFSET 24
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#define SPRD_DMA_FRAG_INT_EN BIT(0)
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#define SPRD_DMA_BLK_INT_EN BIT(1)
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#define SPRD_DMA_TRANS_INT_EN BIT(2)
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#define SPRD_DMA_LIST_INT_EN BIT(3)
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#define SPRD_DMA_CFG_ERR_INT_EN BIT(4)
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/* SPRD_DMA_CHN_CFG register definition */
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#define SPRD_DMA_CHN_EN BIT(0)
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#define SPRD_DMA_WAIT_BDONE_OFFSET 24
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#define SPRD_DMA_DONOT_WAIT_BDONE 1
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/* SPRD_DMA_CHN_REQ register definition */
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#define SPRD_DMA_REQ_EN BIT(0)
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/* SPRD_DMA_CHN_PAUSE register definition */
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#define SPRD_DMA_PAUSE_EN BIT(0)
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#define SPRD_DMA_PAUSE_STS BIT(2)
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#define SPRD_DMA_PAUSE_CNT 0x2000
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/* DMA_CHN_WARP_* register definition */
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#define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28)
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#define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0)
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#define SPRD_DMA_HIGH_ADDR_OFFSET 4
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/* SPRD_DMA_CHN_INTC register definition */
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#define SPRD_DMA_FRAG_INT_STS BIT(16)
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#define SPRD_DMA_BLK_INT_STS BIT(17)
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#define SPRD_DMA_TRSC_INT_STS BIT(18)
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#define SPRD_DMA_LIST_INT_STS BIT(19)
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#define SPRD_DMA_CFGERR_INT_STS BIT(20)
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#define SPRD_DMA_CHN_INT_STS \
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(SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \
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SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \
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SPRD_DMA_CFGERR_INT_STS)
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/* SPRD_DMA_CHN_FRG_LEN register definition */
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#define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30
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#define SPRD_DMA_DES_DATAWIDTH_OFFSET 28
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#define SPRD_DMA_SWT_MODE_OFFSET 26
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#define SPRD_DMA_REQ_MODE_OFFSET 24
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#define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0)
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#define SPRD_DMA_FIX_SEL_OFFSET 21
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#define SPRD_DMA_FIX_EN_OFFSET 20
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#define SPRD_DMA_LLIST_END_OFFSET 19
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#define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0)
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/* SPRD_DMA_CHN_BLK_LEN register definition */
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#define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0)
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/* SPRD_DMA_CHN_TRSC_LEN register definition */
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#define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0)
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/* SPRD_DMA_CHN_TRSF_STEP register definition */
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#define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16
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#define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0
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#define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0)
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#define SPRD_DMA_SOFTWARE_UID 0
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/*
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* enum sprd_dma_req_mode: define the DMA request mode
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* @SPRD_DMA_FRAG_REQ: fragment request mode
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* @SPRD_DMA_BLK_REQ: block request mode
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* @SPRD_DMA_TRANS_REQ: transaction request mode
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* @SPRD_DMA_LIST_REQ: link-list request mode
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*
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* We have 4 types request mode: fragment mode, block mode, transaction mode
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* and linklist mode. One transaction can contain several blocks, one block can
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* contain several fragments. Link-list mode means we can save several DMA
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* configuration into one reserved memory, then DMA can fetch each DMA
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* configuration automatically to start transfer.
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*/
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enum sprd_dma_req_mode {
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SPRD_DMA_FRAG_REQ,
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SPRD_DMA_BLK_REQ,
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SPRD_DMA_TRANS_REQ,
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SPRD_DMA_LIST_REQ,
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};
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/*
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* enum sprd_dma_int_type: define the DMA interrupt type
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* @SPRD_DMA_NO_INT: do not need generate DMA interrupts.
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* @SPRD_DMA_FRAG_INT: fragment done interrupt when one fragment request
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* is done.
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* @SPRD_DMA_BLK_INT: block done interrupt when one block request is done.
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* @SPRD_DMA_BLK_FRAG_INT: block and fragment interrupt when one fragment
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* or one block request is done.
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* @SPRD_DMA_TRANS_INT: tansaction done interrupt when one transaction
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* request is done.
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* @SPRD_DMA_TRANS_FRAG_INT: transaction and fragment interrupt when one
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* transaction request or fragment request is done.
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* @SPRD_DMA_TRANS_BLK_INT: transaction and block interrupt when one
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* transaction request or block request is done.
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* @SPRD_DMA_LIST_INT: link-list done interrupt when one link-list request
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* is done.
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* @SPRD_DMA_CFGERR_INT: configure error interrupt when configuration is
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* incorrect.
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*/
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enum sprd_dma_int_type {
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SPRD_DMA_NO_INT,
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SPRD_DMA_FRAG_INT,
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SPRD_DMA_BLK_INT,
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SPRD_DMA_BLK_FRAG_INT,
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SPRD_DMA_TRANS_INT,
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SPRD_DMA_TRANS_FRAG_INT,
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SPRD_DMA_TRANS_BLK_INT,
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SPRD_DMA_LIST_INT,
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SPRD_DMA_CFGERR_INT,
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};
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/* dma channel hardware configuration */
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struct sprd_dma_chn_hw {
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u32 pause;
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u32 req;
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u32 cfg;
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u32 intc;
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u32 src_addr;
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u32 des_addr;
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u32 frg_len;
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u32 blk_len;
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u32 trsc_len;
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u32 trsf_step;
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u32 wrap_ptr;
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u32 wrap_to;
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u32 llist_ptr;
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u32 frg_step;
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u32 src_blk_step;
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u32 des_blk_step;
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};
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/* dma request description */
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struct sprd_dma_desc {
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struct virt_dma_desc vd;
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struct sprd_dma_chn_hw chn_hw;
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};
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/* dma channel description */
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struct sprd_dma_chn {
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struct virt_dma_chan vc;
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void __iomem *chn_base;
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u32 chn_num;
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u32 dev_id;
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struct sprd_dma_desc *cur_desc;
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};
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/* SPRD dma device */
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struct sprd_dma_dev {
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struct dma_device dma_dev;
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void __iomem *glb_base;
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struct clk *clk;
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struct clk *ashb_clk;
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int irq;
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u32 total_chns;
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struct sprd_dma_chn channels[0];
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};
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static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param);
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static struct of_dma_filter_info sprd_dma_info = {
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.filter_fn = sprd_dma_filter_fn,
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};
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static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c)
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{
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return container_of(c, struct sprd_dma_chn, vc.chan);
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}
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static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c)
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{
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struct sprd_dma_chn *schan = to_sprd_dma_chan(c);
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return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]);
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}
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static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd)
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{
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return container_of(vd, struct sprd_dma_desc, vd);
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}
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static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg,
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u32 mask, u32 val)
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{
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u32 orig = readl(schan->chn_base + reg);
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u32 tmp;
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tmp = (orig & ~mask) | val;
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writel(tmp, schan->chn_base + reg);
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}
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static int sprd_dma_enable(struct sprd_dma_dev *sdev)
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{
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int ret;
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ret = clk_prepare_enable(sdev->clk);
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if (ret)
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return ret;
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/*
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* The ashb_clk is optional and only for AGCP DMA controller, so we
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* need add one condition to check if the ashb_clk need enable.
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*/
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if (!IS_ERR(sdev->ashb_clk))
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ret = clk_prepare_enable(sdev->ashb_clk);
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return ret;
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}
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static void sprd_dma_disable(struct sprd_dma_dev *sdev)
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{
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clk_disable_unprepare(sdev->clk);
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/*
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* Need to check if we need disable the optional ashb_clk for AGCP DMA.
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*/
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if (!IS_ERR(sdev->ashb_clk))
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clk_disable_unprepare(sdev->ashb_clk);
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}
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static void sprd_dma_set_uid(struct sprd_dma_chn *schan)
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{
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struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
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u32 dev_id = schan->dev_id;
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if (dev_id != SPRD_DMA_SOFTWARE_UID) {
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u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
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SPRD_DMA_GLB_REQ_UID(dev_id);
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writel(schan->chn_num + 1, sdev->glb_base + uid_offset);
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}
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}
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static void sprd_dma_unset_uid(struct sprd_dma_chn *schan)
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{
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struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
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u32 dev_id = schan->dev_id;
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if (dev_id != SPRD_DMA_SOFTWARE_UID) {
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u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET +
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SPRD_DMA_GLB_REQ_UID(dev_id);
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writel(0, sdev->glb_base + uid_offset);
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}
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}
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static void sprd_dma_clear_int(struct sprd_dma_chn *schan)
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{
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC,
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SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET,
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SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET);
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}
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static void sprd_dma_enable_chn(struct sprd_dma_chn *schan)
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{
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN,
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SPRD_DMA_CHN_EN);
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}
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static void sprd_dma_disable_chn(struct sprd_dma_chn *schan)
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{
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0);
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}
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static void sprd_dma_soft_request(struct sprd_dma_chn *schan)
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{
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN,
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SPRD_DMA_REQ_EN);
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}
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static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable)
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{
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struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
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u32 pause, timeout = SPRD_DMA_PAUSE_CNT;
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if (enable) {
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
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SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN);
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do {
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pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE);
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if (pause & SPRD_DMA_PAUSE_STS)
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break;
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cpu_relax();
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} while (--timeout > 0);
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if (!timeout)
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dev_warn(sdev->dma_dev.dev,
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"pause dma controller timeout\n");
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} else {
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sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE,
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SPRD_DMA_PAUSE_EN, 0);
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}
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}
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static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan)
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{
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u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG);
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if (!(cfg & SPRD_DMA_CHN_EN))
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return;
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sprd_dma_pause_resume(schan, true);
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sprd_dma_disable_chn(schan);
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}
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static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan)
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{
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unsigned long addr, addr_high;
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addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
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addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) &
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SPRD_DMA_HIGH_ADDR_MASK;
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return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET);
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}
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static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan)
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{
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struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
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u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) &
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SPRD_DMA_CHN_INT_STS;
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switch (intc_sts) {
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case SPRD_DMA_CFGERR_INT_STS:
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return SPRD_DMA_CFGERR_INT;
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||||
|
||||
case SPRD_DMA_LIST_INT_STS:
|
||||
return SPRD_DMA_LIST_INT;
|
||||
|
||||
case SPRD_DMA_TRSC_INT_STS:
|
||||
return SPRD_DMA_TRANS_INT;
|
||||
|
||||
case SPRD_DMA_BLK_INT_STS:
|
||||
return SPRD_DMA_BLK_INT;
|
||||
|
||||
case SPRD_DMA_FRAG_INT_STS:
|
||||
return SPRD_DMA_FRAG_INT;
|
||||
|
||||
default:
|
||||
dev_warn(sdev->dma_dev.dev, "incorrect dma interrupt type\n");
|
||||
return SPRD_DMA_NO_INT;
|
||||
}
|
||||
}
|
||||
|
||||
static enum sprd_dma_req_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan)
|
||||
{
|
||||
u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
|
||||
|
||||
return (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) & SPRD_DMA_REQ_MODE_MASK;
|
||||
}
|
||||
|
||||
static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan,
|
||||
struct sprd_dma_desc *sdesc)
|
||||
{
|
||||
struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw;
|
||||
|
||||
writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE);
|
||||
writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG);
|
||||
writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC);
|
||||
writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR);
|
||||
writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR);
|
||||
writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
|
||||
writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN);
|
||||
writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN);
|
||||
writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP);
|
||||
writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR);
|
||||
writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO);
|
||||
writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR);
|
||||
writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP);
|
||||
writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP);
|
||||
writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP);
|
||||
writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ);
|
||||
}
|
||||
|
||||
static void sprd_dma_start(struct sprd_dma_chn *schan)
|
||||
{
|
||||
struct virt_dma_desc *vd = vchan_next_desc(&schan->vc);
|
||||
|
||||
if (!vd)
|
||||
return;
|
||||
|
||||
list_del(&vd->node);
|
||||
schan->cur_desc = to_sprd_dma_desc(vd);
|
||||
|
||||
/*
|
||||
* Copy the DMA configuration from DMA descriptor to this hardware
|
||||
* channel.
|
||||
*/
|
||||
sprd_dma_set_chn_config(schan, schan->cur_desc);
|
||||
sprd_dma_set_uid(schan);
|
||||
sprd_dma_enable_chn(schan);
|
||||
|
||||
if (schan->dev_id == SPRD_DMA_SOFTWARE_UID)
|
||||
sprd_dma_soft_request(schan);
|
||||
}
|
||||
|
||||
static void sprd_dma_stop(struct sprd_dma_chn *schan)
|
||||
{
|
||||
sprd_dma_stop_and_disable(schan);
|
||||
sprd_dma_unset_uid(schan);
|
||||
sprd_dma_clear_int(schan);
|
||||
}
|
||||
|
||||
static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc,
|
||||
enum sprd_dma_int_type int_type,
|
||||
enum sprd_dma_req_mode req_mode)
|
||||
{
|
||||
if (int_type == SPRD_DMA_NO_INT)
|
||||
return false;
|
||||
|
||||
if (int_type >= req_mode + 1)
|
||||
return true;
|
||||
else
|
||||
return false;
|
||||
}
|
||||
|
||||
static irqreturn_t dma_irq_handle(int irq, void *dev_id)
|
||||
{
|
||||
struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id;
|
||||
u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS);
|
||||
struct sprd_dma_chn *schan;
|
||||
struct sprd_dma_desc *sdesc;
|
||||
enum sprd_dma_req_mode req_type;
|
||||
enum sprd_dma_int_type int_type;
|
||||
bool trans_done = false;
|
||||
u32 i;
|
||||
|
||||
while (irq_status) {
|
||||
i = __ffs(irq_status);
|
||||
irq_status &= (irq_status - 1);
|
||||
schan = &sdev->channels[i];
|
||||
|
||||
spin_lock(&schan->vc.lock);
|
||||
int_type = sprd_dma_get_int_type(schan);
|
||||
req_type = sprd_dma_get_req_type(schan);
|
||||
sprd_dma_clear_int(schan);
|
||||
|
||||
sdesc = schan->cur_desc;
|
||||
|
||||
/* Check if the dma request descriptor is done. */
|
||||
trans_done = sprd_dma_check_trans_done(sdesc, int_type,
|
||||
req_type);
|
||||
if (trans_done == true) {
|
||||
vchan_cookie_complete(&sdesc->vd);
|
||||
schan->cur_desc = NULL;
|
||||
sprd_dma_start(schan);
|
||||
}
|
||||
spin_unlock(&schan->vc.lock);
|
||||
}
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int sprd_dma_alloc_chan_resources(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
int ret;
|
||||
|
||||
ret = pm_runtime_get_sync(chan->device->dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
schan->dev_id = SPRD_DMA_SOFTWARE_UID;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sprd_dma_free_chan_resources(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
sprd_dma_stop(schan);
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
|
||||
vchan_free_chan_resources(&schan->vc);
|
||||
pm_runtime_put(chan->device->dev);
|
||||
}
|
||||
|
||||
static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
|
||||
dma_cookie_t cookie,
|
||||
struct dma_tx_state *txstate)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
struct virt_dma_desc *vd;
|
||||
unsigned long flags;
|
||||
enum dma_status ret;
|
||||
u32 pos;
|
||||
|
||||
ret = dma_cookie_status(chan, cookie, txstate);
|
||||
if (ret == DMA_COMPLETE || !txstate)
|
||||
return ret;
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
vd = vchan_find_desc(&schan->vc, cookie);
|
||||
if (vd) {
|
||||
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
|
||||
struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
|
||||
|
||||
if (hw->trsc_len > 0)
|
||||
pos = hw->trsc_len;
|
||||
else if (hw->blk_len > 0)
|
||||
pos = hw->blk_len;
|
||||
else if (hw->frg_len > 0)
|
||||
pos = hw->frg_len;
|
||||
else
|
||||
pos = 0;
|
||||
} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
|
||||
pos = sprd_dma_get_dst_addr(schan);
|
||||
} else {
|
||||
pos = 0;
|
||||
}
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
|
||||
dma_set_residue(txstate, pos);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void sprd_dma_issue_pending(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
if (vchan_issue_pending(&schan->vc) && !schan->cur_desc)
|
||||
sprd_dma_start(schan);
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
}
|
||||
|
||||
static int sprd_dma_config(struct dma_chan *chan, struct sprd_dma_desc *sdesc,
|
||||
dma_addr_t dest, dma_addr_t src, size_t len)
|
||||
{
|
||||
struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
|
||||
struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
|
||||
u32 datawidth, src_step, des_step, fragment_len;
|
||||
u32 block_len, req_mode, irq_mode, transcation_len;
|
||||
u32 fix_mode = 0, fix_en = 0;
|
||||
|
||||
if (IS_ALIGNED(len, 4)) {
|
||||
datawidth = 2;
|
||||
src_step = 4;
|
||||
des_step = 4;
|
||||
} else if (IS_ALIGNED(len, 2)) {
|
||||
datawidth = 1;
|
||||
src_step = 2;
|
||||
des_step = 2;
|
||||
} else {
|
||||
datawidth = 0;
|
||||
src_step = 1;
|
||||
des_step = 1;
|
||||
}
|
||||
|
||||
fragment_len = SPRD_DMA_MEMCPY_MIN_SIZE;
|
||||
if (len <= SPRD_DMA_BLK_LEN_MASK) {
|
||||
block_len = len;
|
||||
transcation_len = 0;
|
||||
req_mode = SPRD_DMA_BLK_REQ;
|
||||
irq_mode = SPRD_DMA_BLK_INT;
|
||||
} else {
|
||||
block_len = SPRD_DMA_MEMCPY_MIN_SIZE;
|
||||
transcation_len = len;
|
||||
req_mode = SPRD_DMA_TRANS_REQ;
|
||||
irq_mode = SPRD_DMA_TRANS_INT;
|
||||
}
|
||||
|
||||
hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET;
|
||||
hw->wrap_ptr = (u32)((src >> SPRD_DMA_HIGH_ADDR_OFFSET) &
|
||||
SPRD_DMA_HIGH_ADDR_MASK);
|
||||
hw->wrap_to = (u32)((dest >> SPRD_DMA_HIGH_ADDR_OFFSET) &
|
||||
SPRD_DMA_HIGH_ADDR_MASK);
|
||||
|
||||
hw->src_addr = (u32)(src & SPRD_DMA_LOW_ADDR_MASK);
|
||||
hw->des_addr = (u32)(dest & SPRD_DMA_LOW_ADDR_MASK);
|
||||
|
||||
if ((src_step != 0 && des_step != 0) || (src_step | des_step) == 0) {
|
||||
fix_en = 0;
|
||||
} else {
|
||||
fix_en = 1;
|
||||
if (src_step)
|
||||
fix_mode = 1;
|
||||
else
|
||||
fix_mode = 0;
|
||||
}
|
||||
|
||||
hw->frg_len = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET |
|
||||
datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET |
|
||||
req_mode << SPRD_DMA_REQ_MODE_OFFSET |
|
||||
fix_mode << SPRD_DMA_FIX_SEL_OFFSET |
|
||||
fix_en << SPRD_DMA_FIX_EN_OFFSET |
|
||||
(fragment_len & SPRD_DMA_FRG_LEN_MASK);
|
||||
hw->blk_len = block_len & SPRD_DMA_BLK_LEN_MASK;
|
||||
|
||||
hw->intc = SPRD_DMA_CFG_ERR_INT_EN;
|
||||
|
||||
switch (irq_mode) {
|
||||
case SPRD_DMA_NO_INT:
|
||||
break;
|
||||
|
||||
case SPRD_DMA_FRAG_INT:
|
||||
hw->intc |= SPRD_DMA_FRAG_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_BLK_INT:
|
||||
hw->intc |= SPRD_DMA_BLK_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_BLK_FRAG_INT:
|
||||
hw->intc |= SPRD_DMA_BLK_INT_EN | SPRD_DMA_FRAG_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_TRANS_INT:
|
||||
hw->intc |= SPRD_DMA_TRANS_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_TRANS_FRAG_INT:
|
||||
hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_FRAG_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_TRANS_BLK_INT:
|
||||
hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_BLK_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_LIST_INT:
|
||||
hw->intc |= SPRD_DMA_LIST_INT_EN;
|
||||
break;
|
||||
|
||||
case SPRD_DMA_CFGERR_INT:
|
||||
hw->intc |= SPRD_DMA_CFG_ERR_INT_EN;
|
||||
break;
|
||||
|
||||
default:
|
||||
dev_err(sdev->dma_dev.dev, "invalid irq mode\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (transcation_len == 0)
|
||||
hw->trsc_len = block_len & SPRD_DMA_TRSC_LEN_MASK;
|
||||
else
|
||||
hw->trsc_len = transcation_len & SPRD_DMA_TRSC_LEN_MASK;
|
||||
|
||||
hw->trsf_step = (des_step & SPRD_DMA_TRSF_STEP_MASK) <<
|
||||
SPRD_DMA_DEST_TRSF_STEP_OFFSET |
|
||||
(src_step & SPRD_DMA_TRSF_STEP_MASK) <<
|
||||
SPRD_DMA_SRC_TRSF_STEP_OFFSET;
|
||||
|
||||
hw->frg_step = 0;
|
||||
hw->src_blk_step = 0;
|
||||
hw->des_blk_step = 0;
|
||||
hw->src_blk_step = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct dma_async_tx_descriptor *
|
||||
sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
|
||||
size_t len, unsigned long flags)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
struct sprd_dma_desc *sdesc;
|
||||
int ret;
|
||||
|
||||
sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
|
||||
if (!sdesc)
|
||||
return NULL;
|
||||
|
||||
ret = sprd_dma_config(chan, sdesc, dest, src, len);
|
||||
if (ret) {
|
||||
kfree(sdesc);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return vchan_tx_prep(&schan->vc, &sdesc->vd, flags);
|
||||
}
|
||||
|
||||
static int sprd_dma_pause(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
sprd_dma_pause_resume(schan, true);
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sprd_dma_resume(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
sprd_dma_pause_resume(schan, false);
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sprd_dma_terminate_all(struct dma_chan *chan)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
unsigned long flags;
|
||||
LIST_HEAD(head);
|
||||
|
||||
spin_lock_irqsave(&schan->vc.lock, flags);
|
||||
sprd_dma_stop(schan);
|
||||
|
||||
vchan_get_all_descriptors(&schan->vc, &head);
|
||||
spin_unlock_irqrestore(&schan->vc.lock, flags);
|
||||
|
||||
vchan_dma_desc_free_list(&schan->vc, &head);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sprd_dma_free_desc(struct virt_dma_desc *vd)
|
||||
{
|
||||
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
|
||||
|
||||
kfree(sdesc);
|
||||
}
|
||||
|
||||
static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param)
|
||||
{
|
||||
struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
|
||||
struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan);
|
||||
u32 req = *(u32 *)param;
|
||||
|
||||
if (req < sdev->total_chns)
|
||||
return req == schan->chn_num + 1;
|
||||
else
|
||||
return false;
|
||||
}
|
||||
|
||||
static int sprd_dma_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct sprd_dma_dev *sdev;
|
||||
struct sprd_dma_chn *dma_chn;
|
||||
struct resource *res;
|
||||
u32 chn_count;
|
||||
int ret, i;
|
||||
|
||||
ret = device_property_read_u32(&pdev->dev, "#dma-channels", &chn_count);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "get dma channels count failed\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev) +
|
||||
sizeof(*dma_chn) * chn_count,
|
||||
GFP_KERNEL);
|
||||
if (!sdev)
|
||||
return -ENOMEM;
|
||||
|
||||
sdev->clk = devm_clk_get(&pdev->dev, "enable");
|
||||
if (IS_ERR(sdev->clk)) {
|
||||
dev_err(&pdev->dev, "get enable clock failed\n");
|
||||
return PTR_ERR(sdev->clk);
|
||||
}
|
||||
|
||||
/* ashb clock is optional for AGCP DMA */
|
||||
sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb");
|
||||
if (IS_ERR(sdev->ashb_clk))
|
||||
dev_warn(&pdev->dev, "no optional ashb eb clock\n");
|
||||
|
||||
/*
|
||||
* We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
|
||||
* DMA controller, it can or do not request the irq, which will save
|
||||
* system power without resuming system by DMA interrupts if AGCP DMA
|
||||
* does not request the irq. Thus the DMA interrupts property should
|
||||
* be optional.
|
||||
*/
|
||||
sdev->irq = platform_get_irq(pdev, 0);
|
||||
if (sdev->irq > 0) {
|
||||
ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle,
|
||||
0, "sprd_dma", (void *)sdev);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "request dma irq failed\n");
|
||||
return ret;
|
||||
}
|
||||
} else {
|
||||
dev_warn(&pdev->dev, "no interrupts for the dma controller\n");
|
||||
}
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
sdev->glb_base = devm_ioremap_nocache(&pdev->dev, res->start,
|
||||
resource_size(res));
|
||||
if (!sdev->glb_base)
|
||||
return -ENOMEM;
|
||||
|
||||
dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask);
|
||||
sdev->total_chns = chn_count;
|
||||
sdev->dma_dev.chancnt = chn_count;
|
||||
INIT_LIST_HEAD(&sdev->dma_dev.channels);
|
||||
INIT_LIST_HEAD(&sdev->dma_dev.global_node);
|
||||
sdev->dma_dev.dev = &pdev->dev;
|
||||
sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources;
|
||||
sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources;
|
||||
sdev->dma_dev.device_tx_status = sprd_dma_tx_status;
|
||||
sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending;
|
||||
sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy;
|
||||
sdev->dma_dev.device_pause = sprd_dma_pause;
|
||||
sdev->dma_dev.device_resume = sprd_dma_resume;
|
||||
sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all;
|
||||
|
||||
for (i = 0; i < chn_count; i++) {
|
||||
dma_chn = &sdev->channels[i];
|
||||
dma_chn->chn_num = i;
|
||||
dma_chn->cur_desc = NULL;
|
||||
/* get each channel's registers base address. */
|
||||
dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET +
|
||||
SPRD_DMA_CHN_REG_LENGTH * i;
|
||||
|
||||
dma_chn->vc.desc_free = sprd_dma_free_desc;
|
||||
vchan_init(&dma_chn->vc, &sdev->dma_dev);
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, sdev);
|
||||
ret = sprd_dma_enable(sdev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
pm_runtime_set_active(&pdev->dev);
|
||||
pm_runtime_enable(&pdev->dev);
|
||||
|
||||
ret = pm_runtime_get_sync(&pdev->dev);
|
||||
if (ret < 0)
|
||||
goto err_rpm;
|
||||
|
||||
ret = dma_async_device_register(&sdev->dma_dev);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
|
||||
goto err_register;
|
||||
}
|
||||
|
||||
sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
|
||||
ret = of_dma_controller_register(np, of_dma_simple_xlate,
|
||||
&sprd_dma_info);
|
||||
if (ret)
|
||||
goto err_of_register;
|
||||
|
||||
pm_runtime_put(&pdev->dev);
|
||||
return 0;
|
||||
|
||||
err_of_register:
|
||||
dma_async_device_unregister(&sdev->dma_dev);
|
||||
err_register:
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
err_rpm:
|
||||
sprd_dma_disable(sdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sprd_dma_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct sprd_dma_dev *sdev = platform_get_drvdata(pdev);
|
||||
struct sprd_dma_chn *c, *cn;
|
||||
int ret;
|
||||
|
||||
ret = pm_runtime_get_sync(&pdev->dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* explicitly free the irq */
|
||||
if (sdev->irq > 0)
|
||||
devm_free_irq(&pdev->dev, sdev->irq, sdev);
|
||||
|
||||
list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels,
|
||||
vc.chan.device_node) {
|
||||
list_del(&c->vc.chan.device_node);
|
||||
tasklet_kill(&c->vc.task);
|
||||
}
|
||||
|
||||
of_dma_controller_free(pdev->dev.of_node);
|
||||
dma_async_device_unregister(&sdev->dma_dev);
|
||||
sprd_dma_disable(sdev);
|
||||
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id sprd_dma_match[] = {
|
||||
{ .compatible = "sprd,sc9860-dma", },
|
||||
{},
|
||||
};
|
||||
|
||||
static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev)
|
||||
{
|
||||
struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
|
||||
|
||||
sprd_dma_disable(sdev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
|
||||
{
|
||||
struct sprd_dma_dev *sdev = dev_get_drvdata(dev);
|
||||
int ret;
|
||||
|
||||
ret = sprd_dma_enable(sdev);
|
||||
if (ret)
|
||||
dev_err(sdev->dma_dev.dev, "enable dma failed\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct dev_pm_ops sprd_dma_pm_ops = {
|
||||
SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
|
||||
sprd_dma_runtime_resume,
|
||||
NULL)
|
||||
};
|
||||
|
||||
static struct platform_driver sprd_dma_driver = {
|
||||
.probe = sprd_dma_probe,
|
||||
.remove = sprd_dma_remove,
|
||||
.driver = {
|
||||
.name = "sprd-dma",
|
||||
.of_match_table = sprd_dma_match,
|
||||
.pm = &sprd_dma_pm_ops,
|
||||
},
|
||||
};
|
||||
module_platform_driver(sprd_dma_driver);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("DMA driver for Spreadtrum");
|
||||
MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
|
||||
MODULE_ALIAS("platform:sprd-dma");
|
||||
Loading…
Reference in a new issue