diff options
Diffstat (limited to 'drivers/dma/sprd-dma.c')
| -rw-r--r-- | drivers/dma/sprd-dma.c | 1308 |
1 files changed, 1308 insertions, 0 deletions
diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c new file mode 100644 index 000000000..60115d8d4 --- /dev/null +++ b/drivers/dma/sprd-dma.c @@ -0,0 +1,1308 @@ +/* + * Copyright (C) 2017 Spreadtrum Communications Inc. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dma/sprd-dma.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +#include "virt-dma.h" + +#define SPRD_DMA_CHN_REG_OFFSET 0x1000 +#define SPRD_DMA_CHN_REG_LENGTH 0x40 +#define SPRD_DMA_MEMCPY_MIN_SIZE 64 + +/* DMA global registers definition */ +#define SPRD_DMA_GLB_PAUSE 0x0 +#define SPRD_DMA_GLB_FRAG_WAIT 0x4 +#define SPRD_DMA_GLB_REQ_PEND0_EN 0x8 +#define SPRD_DMA_GLB_REQ_PEND1_EN 0xc +#define SPRD_DMA_GLB_INT_RAW_STS 0x10 +#define SPRD_DMA_GLB_INT_MSK_STS 0x14 +#define SPRD_DMA_GLB_REQ_STS 0x18 +#define SPRD_DMA_GLB_CHN_EN_STS 0x1c +#define SPRD_DMA_GLB_DEBUG_STS 0x20 +#define SPRD_DMA_GLB_ARB_SEL_STS 0x24 +#define SPRD_DMA_GLB_2STAGE_GRP1 0x28 +#define SPRD_DMA_GLB_2STAGE_GRP2 0x2c +#define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1)) +#define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000 + +/* DMA channel registers definition */ +#define SPRD_DMA_CHN_PAUSE 0x0 +#define SPRD_DMA_CHN_REQ 0x4 +#define SPRD_DMA_CHN_CFG 0x8 +#define SPRD_DMA_CHN_INTC 0xc +#define SPRD_DMA_CHN_SRC_ADDR 0x10 +#define SPRD_DMA_CHN_DES_ADDR 0x14 +#define SPRD_DMA_CHN_FRG_LEN 0x18 +#define SPRD_DMA_CHN_BLK_LEN 0x1c +#define SPRD_DMA_CHN_TRSC_LEN 0x20 +#define SPRD_DMA_CHN_TRSF_STEP 0x24 +#define SPRD_DMA_CHN_WARP_PTR 0x28 +#define SPRD_DMA_CHN_WARP_TO 0x2c +#define SPRD_DMA_CHN_LLIST_PTR 0x30 +#define SPRD_DMA_CHN_FRAG_STEP 0x34 +#define SPRD_DMA_CHN_SRC_BLK_STEP 0x38 +#define SPRD_DMA_CHN_DES_BLK_STEP 0x3c + +/* SPRD_DMA_GLB_2STAGE_GRP register definition */ +#define SPRD_DMA_GLB_2STAGE_EN BIT(24) +#define SPRD_DMA_GLB_CHN_INT_MASK GENMASK(23, 20) +#define SPRD_DMA_GLB_DEST_INT BIT(22) +#define SPRD_DMA_GLB_SRC_INT BIT(20) +#define SPRD_DMA_GLB_LIST_DONE_TRG BIT(19) +#define SPRD_DMA_GLB_TRANS_DONE_TRG BIT(18) +#define SPRD_DMA_GLB_BLOCK_DONE_TRG BIT(17) +#define SPRD_DMA_GLB_FRAG_DONE_TRG BIT(16) +#define SPRD_DMA_GLB_TRG_OFFSET 16 +#define SPRD_DMA_GLB_DEST_CHN_MASK GENMASK(13, 8) +#define SPRD_DMA_GLB_DEST_CHN_OFFSET 8 +#define SPRD_DMA_GLB_SRC_CHN_MASK GENMASK(5, 0) + +/* SPRD_DMA_CHN_INTC register definition */ +#define SPRD_DMA_INT_MASK GENMASK(4, 0) +#define SPRD_DMA_INT_CLR_OFFSET 24 +#define SPRD_DMA_FRAG_INT_EN BIT(0) +#define SPRD_DMA_BLK_INT_EN BIT(1) +#define SPRD_DMA_TRANS_INT_EN BIT(2) +#define SPRD_DMA_LIST_INT_EN BIT(3) +#define SPRD_DMA_CFG_ERR_INT_EN BIT(4) + +/* SPRD_DMA_CHN_CFG register definition */ +#define SPRD_DMA_CHN_EN BIT(0) +#define SPRD_DMA_LINKLIST_EN BIT(4) +#define SPRD_DMA_WAIT_BDONE_OFFSET 24 +#define SPRD_DMA_DONOT_WAIT_BDONE 1 + +/* SPRD_DMA_CHN_REQ register definition */ +#define SPRD_DMA_REQ_EN BIT(0) + +/* SPRD_DMA_CHN_PAUSE register definition */ +#define SPRD_DMA_PAUSE_EN BIT(0) +#define SPRD_DMA_PAUSE_STS BIT(2) +#define SPRD_DMA_PAUSE_CNT 0x2000 + +/* DMA_CHN_WARP_* register definition */ +#define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28) +#define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0) +#define SPRD_DMA_WRAP_ADDR_MASK GENMASK(27, 0) +#define SPRD_DMA_HIGH_ADDR_OFFSET 4 + +/* SPRD_DMA_CHN_INTC register definition */ +#define SPRD_DMA_FRAG_INT_STS BIT(16) +#define SPRD_DMA_BLK_INT_STS BIT(17) +#define SPRD_DMA_TRSC_INT_STS BIT(18) +#define SPRD_DMA_LIST_INT_STS BIT(19) +#define SPRD_DMA_CFGERR_INT_STS BIT(20) +#define SPRD_DMA_CHN_INT_STS \ + (SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \ + SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \ + SPRD_DMA_CFGERR_INT_STS) + +/* SPRD_DMA_CHN_FRG_LEN register definition */ +#define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30 +#define SPRD_DMA_DES_DATAWIDTH_OFFSET 28 +#define SPRD_DMA_SWT_MODE_OFFSET 26 +#define SPRD_DMA_REQ_MODE_OFFSET 24 +#define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0) +#define SPRD_DMA_WRAP_SEL_DEST BIT(23) +#define SPRD_DMA_WRAP_EN BIT(22) +#define SPRD_DMA_FIX_SEL_OFFSET 21 +#define SPRD_DMA_FIX_EN_OFFSET 20 +#define SPRD_DMA_LLIST_END BIT(19) +#define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0) + +/* SPRD_DMA_CHN_BLK_LEN register definition */ +#define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0) + +/* SPRD_DMA_CHN_TRSC_LEN register definition */ +#define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0) + +/* SPRD_DMA_CHN_TRSF_STEP register definition */ +#define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16 +#define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0 +#define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0) + +/* SPRD DMA_SRC_BLK_STEP register definition */ +#define SPRD_DMA_LLIST_HIGH_MASK GENMASK(31, 28) +#define SPRD_DMA_LLIST_HIGH_SHIFT 28 + +/* define DMA channel mode & trigger mode mask */ +#define SPRD_DMA_CHN_MODE_MASK GENMASK(7, 0) +#define SPRD_DMA_TRG_MODE_MASK GENMASK(7, 0) +#define SPRD_DMA_INT_TYPE_MASK GENMASK(7, 0) + +/* define the DMA transfer step type */ +#define SPRD_DMA_NONE_STEP 0 +#define SPRD_DMA_BYTE_STEP 1 +#define SPRD_DMA_SHORT_STEP 2 +#define SPRD_DMA_WORD_STEP 4 +#define SPRD_DMA_DWORD_STEP 8 + +#define SPRD_DMA_SOFTWARE_UID 0 + +/* dma data width values */ +enum sprd_dma_datawidth { + SPRD_DMA_DATAWIDTH_1_BYTE, + SPRD_DMA_DATAWIDTH_2_BYTES, + SPRD_DMA_DATAWIDTH_4_BYTES, + SPRD_DMA_DATAWIDTH_8_BYTES, +}; + +/* dma channel hardware configuration */ +struct sprd_dma_chn_hw { + u32 pause; + u32 req; + u32 cfg; + u32 intc; + u32 src_addr; + u32 des_addr; + u32 frg_len; + u32 blk_len; + u32 trsc_len; + u32 trsf_step; + u32 wrap_ptr; + u32 wrap_to; + u32 llist_ptr; + u32 frg_step; + u32 src_blk_step; + u32 des_blk_step; +}; + +/* dma request description */ +struct sprd_dma_desc { + struct virt_dma_desc vd; + struct sprd_dma_chn_hw chn_hw; + enum dma_transfer_direction dir; +}; + +/* dma channel description */ +struct sprd_dma_chn { + struct virt_dma_chan vc; + void __iomem *chn_base; + struct sprd_dma_linklist linklist; + struct dma_slave_config slave_cfg; + u32 chn_num; + u32 dev_id; + enum sprd_dma_chn_mode chn_mode; + enum sprd_dma_trg_mode trg_mode; + enum sprd_dma_int_type int_type; + struct sprd_dma_desc *cur_desc; +}; + +/* SPRD dma device */ +struct sprd_dma_dev { + struct dma_device dma_dev; + void __iomem *glb_base; + struct clk *clk; + struct clk *ashb_clk; + int irq; + u32 total_chns; + struct sprd_dma_chn channels[]; +}; + +static void sprd_dma_free_desc(struct virt_dma_desc *vd); +static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param); +static struct of_dma_filter_info sprd_dma_info = { + .filter_fn = sprd_dma_filter_fn, +}; + +static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct sprd_dma_chn, vc.chan); +} + +static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c) +{ + struct sprd_dma_chn *schan = to_sprd_dma_chan(c); + + return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]); +} + +static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd) +{ + return container_of(vd, struct sprd_dma_desc, vd); +} + +static void sprd_dma_glb_update(struct sprd_dma_dev *sdev, u32 reg, + u32 mask, u32 val) +{ + u32 orig = readl(sdev->glb_base + reg); + u32 tmp; + + tmp = (orig & ~mask) | val; + writel(tmp, sdev->glb_base + reg); +} + +static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg, + u32 mask, u32 val) +{ + u32 orig = readl(schan->chn_base + reg); + u32 tmp; + + tmp = (orig & ~mask) | val; + writel(tmp, schan->chn_base + reg); +} + +static int sprd_dma_enable(struct sprd_dma_dev *sdev) +{ + int ret; + + ret = clk_prepare_enable(sdev->clk); + if (ret) + return ret; + + /* + * The ashb_clk is optional and only for AGCP DMA controller, so we + * need add one condition to check if the ashb_clk need enable. + */ + if (!IS_ERR(sdev->ashb_clk)) + ret = clk_prepare_enable(sdev->ashb_clk); + + return ret; +} + +static void sprd_dma_disable(struct sprd_dma_dev *sdev) +{ + clk_disable_unprepare(sdev->clk); + + /* + * Need to check if we need disable the optional ashb_clk for AGCP DMA. + */ + if (!IS_ERR(sdev->ashb_clk)) + clk_disable_unprepare(sdev->ashb_clk); +} + +static void sprd_dma_set_uid(struct sprd_dma_chn *schan) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 dev_id = schan->dev_id; + + if (dev_id != SPRD_DMA_SOFTWARE_UID) { + u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET + + SPRD_DMA_GLB_REQ_UID(dev_id); + + writel(schan->chn_num + 1, sdev->glb_base + uid_offset); + } +} + +static void sprd_dma_unset_uid(struct sprd_dma_chn *schan) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 dev_id = schan->dev_id; + + if (dev_id != SPRD_DMA_SOFTWARE_UID) { + u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET + + SPRD_DMA_GLB_REQ_UID(dev_id); + + writel(0, sdev->glb_base + uid_offset); + } +} + +static void sprd_dma_clear_int(struct sprd_dma_chn *schan) +{ + sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC, + SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET, + SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET); +} + +static void sprd_dma_enable_chn(struct sprd_dma_chn *schan) +{ + sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, + SPRD_DMA_CHN_EN); +} + +static void sprd_dma_disable_chn(struct sprd_dma_chn *schan) +{ + sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0); +} + +static void sprd_dma_soft_request(struct sprd_dma_chn *schan) +{ + sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN, + SPRD_DMA_REQ_EN); +} + +static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 pause, timeout = SPRD_DMA_PAUSE_CNT; + + if (enable) { + sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE, + SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN); + + do { + pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE); + if (pause & SPRD_DMA_PAUSE_STS) + break; + + cpu_relax(); + } while (--timeout > 0); + + if (!timeout) + dev_warn(sdev->dma_dev.dev, + "pause dma controller timeout\n"); + } else { + sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE, + SPRD_DMA_PAUSE_EN, 0); + } +} + +static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan) +{ + u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG); + + if (!(cfg & SPRD_DMA_CHN_EN)) + return; + + sprd_dma_pause_resume(schan, true); + sprd_dma_disable_chn(schan); +} + +static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan) +{ + unsigned long addr, addr_high; + + addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR); + addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) & + SPRD_DMA_HIGH_ADDR_MASK; + + return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET); +} + +static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan) +{ + unsigned long addr, addr_high; + + addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR); + addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) & + SPRD_DMA_HIGH_ADDR_MASK; + + return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET); +} + +static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) & + SPRD_DMA_CHN_INT_STS; + + switch (intc_sts) { + case SPRD_DMA_CFGERR_INT_STS: + return SPRD_DMA_CFGERR_INT; + + 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 int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 val, chn = schan->chn_num + 1; + + switch (schan->chn_mode) { + case SPRD_DMA_SRC_CHN0: + val = chn & SPRD_DMA_GLB_SRC_CHN_MASK; + val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET; + val |= SPRD_DMA_GLB_2STAGE_EN; + if (schan->int_type != SPRD_DMA_NO_INT) + val |= SPRD_DMA_GLB_SRC_INT; + + sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val); + break; + + case SPRD_DMA_SRC_CHN1: + val = chn & SPRD_DMA_GLB_SRC_CHN_MASK; + val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET; + val |= SPRD_DMA_GLB_2STAGE_EN; + if (schan->int_type != SPRD_DMA_NO_INT) + val |= SPRD_DMA_GLB_SRC_INT; + + sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val); + break; + + case SPRD_DMA_DST_CHN0: + val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) & + SPRD_DMA_GLB_DEST_CHN_MASK; + val |= SPRD_DMA_GLB_2STAGE_EN; + if (schan->int_type != SPRD_DMA_NO_INT) + val |= SPRD_DMA_GLB_DEST_INT; + + sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val); + break; + + case SPRD_DMA_DST_CHN1: + val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) & + SPRD_DMA_GLB_DEST_CHN_MASK; + val |= SPRD_DMA_GLB_2STAGE_EN; + if (schan->int_type != SPRD_DMA_NO_INT) + val |= SPRD_DMA_GLB_DEST_INT; + + sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val); + break; + + default: + dev_err(sdev->dma_dev.dev, "invalid channel mode setting %d\n", + schan->chn_mode); + return -EINVAL; + } + + return 0; +} + +static void sprd_dma_set_pending(struct sprd_dma_chn *schan, bool enable) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); + u32 reg, val, req_id; + + if (schan->dev_id == SPRD_DMA_SOFTWARE_UID) + return; + + /* The DMA request id always starts from 0. */ + req_id = schan->dev_id - 1; + + if (req_id < 32) { + reg = SPRD_DMA_GLB_REQ_PEND0_EN; + val = BIT(req_id); + } else { + reg = SPRD_DMA_GLB_REQ_PEND1_EN; + val = BIT(req_id - 32); + } + + sprd_dma_glb_update(sdev, reg, val, enable ? val : 0); +} + +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); + + /* + * Set 2-stage configuration if the channel starts one 2-stage + * transfer. + */ + if (schan->chn_mode && sprd_dma_set_2stage_config(schan)) + return; + + /* + * 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_set_pending(schan, true); + sprd_dma_enable_chn(schan); + + if (schan->dev_id == SPRD_DMA_SOFTWARE_UID && + schan->chn_mode != SPRD_DMA_DST_CHN0 && + schan->chn_mode != SPRD_DMA_DST_CHN1) + sprd_dma_soft_request(schan); +} + +static void sprd_dma_stop(struct sprd_dma_chn *schan) +{ + sprd_dma_stop_and_disable(schan); + sprd_dma_set_pending(schan, false); + sprd_dma_unset_uid(schan); + sprd_dma_clear_int(schan); + schan->cur_desc = NULL; +} + +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, cyclic = false; + u32 i; + + while (irq_status) { + i = __ffs(irq_status); + irq_status &= (irq_status - 1); + schan = &sdev->channels[i]; + + spin_lock(&schan->vc.lock); + + sdesc = schan->cur_desc; + if (!sdesc) { + spin_unlock(&schan->vc.lock); + return IRQ_HANDLED; + } + + int_type = sprd_dma_get_int_type(schan); + req_type = sprd_dma_get_req_type(schan); + sprd_dma_clear_int(schan); + + /* cyclic mode schedule callback */ + cyclic = schan->linklist.phy_addr ? true : false; + if (cyclic == true) { + vchan_cyclic_callback(&sdesc->vd); + } else { + /* 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) +{ + return pm_runtime_get_sync(chan->device->dev); +} + +static void sprd_dma_free_chan_resources(struct dma_chan *chan) +{ + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); + struct virt_dma_desc *cur_vd = NULL; + unsigned long flags; + + spin_lock_irqsave(&schan->vc.lock, flags); + if (schan->cur_desc) + cur_vd = &schan->cur_desc->vd; + + sprd_dma_stop(schan); + spin_unlock_irqrestore(&schan->vc.lock, flags); + + if (cur_vd) + sprd_dma_free_desc(cur_vd); + + 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) { + struct sprd_dma_desc *sdesc = schan->cur_desc; + + if (sdesc->dir == DMA_DEV_TO_MEM) + pos = sprd_dma_get_dst_addr(schan); + else + pos = sprd_dma_get_src_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_get_datawidth(enum dma_slave_buswidth buswidth) +{ + switch (buswidth) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + case DMA_SLAVE_BUSWIDTH_8_BYTES: + return ffs(buswidth) - 1; + + default: + return -EINVAL; + } +} + +static int sprd_dma_get_step(enum dma_slave_buswidth buswidth) +{ + switch (buswidth) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + case DMA_SLAVE_BUSWIDTH_8_BYTES: + return buswidth; + + default: + return -EINVAL; + } +} + +static int sprd_dma_fill_desc(struct dma_chan *chan, + struct sprd_dma_chn_hw *hw, + unsigned int sglen, int sg_index, + dma_addr_t src, dma_addr_t dst, u32 len, + enum dma_transfer_direction dir, + unsigned long flags, + struct dma_slave_config *slave_cfg) +{ + struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan); + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); + enum sprd_dma_chn_mode chn_mode = schan->chn_mode; + u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK; + u32 int_mode = flags & SPRD_DMA_INT_MASK; + int src_datawidth, dst_datawidth, src_step, dst_step; + u32 temp, fix_mode = 0, fix_en = 0; + phys_addr_t llist_ptr; + + if (dir == DMA_MEM_TO_DEV) { + src_step = sprd_dma_get_step(slave_cfg->src_addr_width); + if (src_step < 0) { + dev_err(sdev->dma_dev.dev, "invalid source step\n"); + return src_step; + } + + /* + * For 2-stage transfer, destination channel step can not be 0, + * since destination device is AON IRAM. + */ + if (chn_mode == SPRD_DMA_DST_CHN0 || + chn_mode == SPRD_DMA_DST_CHN1) + dst_step = src_step; + else + dst_step = SPRD_DMA_NONE_STEP; + } else { + dst_step = sprd_dma_get_step(slave_cfg->dst_addr_width); + if (dst_step < 0) { + dev_err(sdev->dma_dev.dev, "invalid destination step\n"); + return dst_step; + } + src_step = SPRD_DMA_NONE_STEP; + } + + src_datawidth = sprd_dma_get_datawidth(slave_cfg->src_addr_width); + if (src_datawidth < 0) { + dev_err(sdev->dma_dev.dev, "invalid source datawidth\n"); + return src_datawidth; + } + + dst_datawidth = sprd_dma_get_datawidth(slave_cfg->dst_addr_width); + if (dst_datawidth < 0) { + dev_err(sdev->dma_dev.dev, "invalid destination datawidth\n"); + return dst_datawidth; + } + + if (slave_cfg->slave_id) + schan->dev_id = slave_cfg->slave_id; + + hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET; + + /* + * wrap_ptr and wrap_to will save the high 4 bits source address and + * destination address. + */ + hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK; + hw->wrap_to = (dst >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK; + hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK; + hw->des_addr = dst & SPRD_DMA_LOW_ADDR_MASK; + + /* + * If the src step and dst step both are 0 or both are not 0, that means + * we can not enable the fix mode. If one is 0 and another one is not, + * we can enable the fix mode. + */ + if ((src_step != 0 && dst_step != 0) || (src_step | dst_step) == 0) { + fix_en = 0; + } else { + fix_en = 1; + if (src_step) + fix_mode = 1; + else + fix_mode = 0; + } + + hw->intc = int_mode | SPRD_DMA_CFG_ERR_INT_EN; + + temp = src_datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET; + temp |= dst_datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET; + temp |= req_mode << SPRD_DMA_REQ_MODE_OFFSET; + temp |= fix_mode << SPRD_DMA_FIX_SEL_OFFSET; + temp |= fix_en << SPRD_DMA_FIX_EN_OFFSET; + temp |= schan->linklist.wrap_addr ? + SPRD_DMA_WRAP_EN | SPRD_DMA_WRAP_SEL_DEST : 0; + temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK; + hw->frg_len = temp; + + hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK; + hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK; + + temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET; + temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET; + hw->trsf_step = temp; + + /* link-list configuration */ + if (schan->linklist.phy_addr) { + hw->cfg |= SPRD_DMA_LINKLIST_EN; + + /* link-list index */ + temp = sglen ? (sg_index + 1) % sglen : 0; + + /* Next link-list configuration's physical address offset */ + temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR; + /* + * Set the link-list pointer point to next link-list + * configuration's physical address. + */ + llist_ptr = schan->linklist.phy_addr + temp; + hw->llist_ptr = lower_32_bits(llist_ptr); + hw->src_blk_step = (upper_32_bits(llist_ptr) << SPRD_DMA_LLIST_HIGH_SHIFT) & + SPRD_DMA_LLIST_HIGH_MASK; + + if (schan->linklist.wrap_addr) { + hw->wrap_ptr |= schan->linklist.wrap_addr & + SPRD_DMA_WRAP_ADDR_MASK; + hw->wrap_to |= dst & SPRD_DMA_WRAP_ADDR_MASK; + } + } else { + hw->llist_ptr = 0; + hw->src_blk_step = 0; + } + + hw->frg_step = 0; + hw->des_blk_step = 0; + return 0; +} + +static int sprd_dma_fill_linklist_desc(struct dma_chan *chan, + unsigned int sglen, int sg_index, + dma_addr_t src, dma_addr_t dst, u32 len, + enum dma_transfer_direction dir, + unsigned long flags, + struct dma_slave_config *slave_cfg) +{ + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); + struct sprd_dma_chn_hw *hw; + + if (!schan->linklist.virt_addr) + return -EINVAL; + + hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr + + sg_index * sizeof(*hw)); + + return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len, + dir, flags, slave_cfg); +} + +static 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; + struct sprd_dma_chn_hw *hw; + enum sprd_dma_datawidth datawidth; + u32 step, temp; + + sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT); + if (!sdesc) + return NULL; + + hw = &sdesc->chn_hw; + + hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET; + hw->intc = SPRD_DMA_TRANS_INT | SPRD_DMA_CFG_ERR_INT_EN; + hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK; + hw->des_addr = dest & SPRD_DMA_LOW_ADDR_MASK; + hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & + SPRD_DMA_HIGH_ADDR_MASK; + hw->wrap_to = (dest >> SPRD_DMA_HIGH_ADDR_OFFSET) & + SPRD_DMA_HIGH_ADDR_MASK; + + if (IS_ALIGNED(len, 8)) { + datawidth = SPRD_DMA_DATAWIDTH_8_BYTES; + step = SPRD_DMA_DWORD_STEP; + } else if (IS_ALIGNED(len, 4)) { + datawidth = SPRD_DMA_DATAWIDTH_4_BYTES; + step = SPRD_DMA_WORD_STEP; + } else if (IS_ALIGNED(len, 2)) { + datawidth = SPRD_DMA_DATAWIDTH_2_BYTES; + step = SPRD_DMA_SHORT_STEP; + } else { + datawidth = SPRD_DMA_DATAWIDTH_1_BYTE; + step = SPRD_DMA_BYTE_STEP; + } + + temp = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET; + temp |= datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET; + temp |= SPRD_DMA_TRANS_REQ << SPRD_DMA_REQ_MODE_OFFSET; + temp |= len & SPRD_DMA_FRG_LEN_MASK; + hw->frg_len = temp; + + hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK; + hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK; + + temp = (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET; + temp |= (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET; + hw->trsf_step = temp; + + return vchan_tx_prep(&schan->vc, &sdesc->vd, flags); +} + +static struct dma_async_tx_descriptor * +sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sglen, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); + struct dma_slave_config *slave_cfg = &schan->slave_cfg; + dma_addr_t src = 0, dst = 0; + dma_addr_t start_src = 0, start_dst = 0; + struct sprd_dma_desc *sdesc; + struct scatterlist *sg; + u32 len = 0; + int ret, i; + + if (!is_slave_direction(dir)) + return NULL; + + if (context) { + struct sprd_dma_linklist *ll_cfg = + (struct sprd_dma_linklist *)context; + + schan->linklist.phy_addr = ll_cfg->phy_addr; + schan->linklist.virt_addr = ll_cfg->virt_addr; + schan->linklist.wrap_addr = ll_cfg->wrap_addr; + } else { + schan->linklist.phy_addr = 0; + schan->linklist.virt_addr = 0; + schan->linklist.wrap_addr = 0; + } + + /* + * Set channel mode, interrupt mode and trigger mode for 2-stage + * transfer. + */ + schan->chn_mode = + (flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK; + schan->trg_mode = + (flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK; + schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK; + + sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT); + if (!sdesc) + return NULL; + + sdesc->dir = dir; + + for_each_sg(sgl, sg, sglen, i) { + len = sg_dma_len(sg); + + if (dir == DMA_MEM_TO_DEV) { + src = sg_dma_address(sg); + dst = slave_cfg->dst_addr; + } else { + src = slave_cfg->src_addr; + dst = sg_dma_address(sg); + } + + if (!i) { + start_src = src; + start_dst = dst; + } + + /* + * The link-list mode needs at least 2 link-list + * configurations. If there is only one sg, it doesn't + * need to fill the link-list configuration. + */ + if (sglen < 2) + break; + + ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len, + dir, flags, slave_cfg); + if (ret) { + kfree(sdesc); + return NULL; + } + } + + ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src, + start_dst, len, dir, flags, slave_cfg); + if (ret) { + kfree(sdesc); + return NULL; + } + + return vchan_tx_prep(&schan->vc, &sdesc->vd, flags); +} + +static int sprd_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); + struct dma_slave_config *slave_cfg = &schan->slave_cfg; + + memcpy(slave_cfg, config, sizeof(*config)); + return 0; +} + +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); + struct virt_dma_desc *cur_vd = NULL; + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&schan->vc.lock, flags); + if (schan->cur_desc) + cur_vd = &schan->cur_desc->vd; + + sprd_dma_stop(schan); + + vchan_get_all_descriptors(&schan->vc, &head); + spin_unlock_irqrestore(&schan->vc.lock, flags); + + if (cur_vd) + sprd_dma_free_desc(cur_vd); + + 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); + u32 slave_id = *(u32 *)param; + + schan->dev_id = slave_id; + return true; +} + +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; + 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, + struct_size(sdev, channels, 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"); + } + + sdev->glb_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sdev->glb_base)) + return PTR_ERR(sdev->glb_base); + + 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_prep_slave_sg = sprd_dma_prep_slave_sg; + sdev->dma_dev.device_config = sprd_dma_slave_config; + 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; + + pm_runtime_get_sync(&pdev->dev); + + /* 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", }, + {}, +}; +MODULE_DEVICE_TABLE(of, sprd_dma_match); + +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_AUTHOR("Eric Long <eric.long@spreadtrum.com>"); +MODULE_ALIAS("platform:sprd-dma"); |