| /* |
| * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) |
| * |
| * Copyright (C) 2014 Atmel Corporation |
| * |
| * Author: Ludovic Desroches <ludovic.desroches@atmel.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <asm/barrier.h> |
| #include <dt-bindings/dma/at91.h> |
| #include <linux/clk.h> |
| #include <linux/dmaengine.h> |
| #include <linux/dmapool.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/of_dma.h> |
| #include <linux/of_platform.h> |
| #include <linux/platform_device.h> |
| #include <linux/pm.h> |
| |
| #include "dmaengine.h" |
| |
| /* Global registers */ |
| #define AT_XDMAC_GTYPE 0x00 /* Global Type Register */ |
| #define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */ |
| #define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */ |
| #define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */ |
| #define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */ |
| #define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */ |
| #define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */ |
| #define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */ |
| #define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */ |
| #define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */ |
| #define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */ |
| #define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */ |
| #define AT_XDMAC_GS 0x24 /* Global Channel Status Register */ |
| #define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */ |
| #define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */ |
| #define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */ |
| #define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */ |
| #define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */ |
| #define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */ |
| #define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */ |
| #define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */ |
| |
| /* Channel relative registers offsets */ |
| #define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */ |
| #define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */ |
| #define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */ |
| #define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */ |
| #define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */ |
| #define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */ |
| #define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */ |
| #define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */ |
| #define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */ |
| #define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */ |
| #define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */ |
| #define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */ |
| #define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */ |
| #define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */ |
| #define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */ |
| #define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */ |
| #define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */ |
| #define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */ |
| #define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */ |
| #define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */ |
| #define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */ |
| #define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */ |
| #define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */ |
| #define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */ |
| #define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */ |
| #define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */ |
| #define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */ |
| #define AT_XDMAC_CC 0x28 /* Channel Configuration Register */ |
| #define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */ |
| #define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */ |
| #define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */ |
| #define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1) |
| #define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1) |
| #define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1) |
| #define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1) |
| #define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1) |
| #define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */ |
| #define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4) |
| #define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4) |
| #define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */ |
| #define AT_XDMAC_CC_PROT_SEC (0x0 << 5) |
| #define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5) |
| #define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */ |
| #define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6) |
| #define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6) |
| #define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */ |
| #define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7) |
| #define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7) |
| #define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */ |
| #define AT_XDMAC_CC_DWIDTH_OFFSET 11 |
| #define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET) |
| #define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */ |
| #define AT_XDMAC_CC_DWIDTH_BYTE 0x0 |
| #define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1 |
| #define AT_XDMAC_CC_DWIDTH_WORD 0x2 |
| #define AT_XDMAC_CC_DWIDTH_DWORD 0x3 |
| #define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */ |
| #define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */ |
| #define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */ |
| #define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16) |
| #define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16) |
| #define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16) |
| #define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16) |
| #define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */ |
| #define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18) |
| #define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18) |
| #define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18) |
| #define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18) |
| #define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */ |
| #define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21) |
| #define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21) |
| #define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */ |
| #define AT_XDMAC_CC_RDIP_DONE (0x0 << 22) |
| #define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22) |
| #define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */ |
| #define AT_XDMAC_CC_WRIP_DONE (0x0 << 23) |
| #define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23) |
| #define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */ |
| #define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */ |
| #define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */ |
| #define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */ |
| |
| #define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */ |
| |
| /* Microblock control members */ |
| #define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */ |
| #define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */ |
| #define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */ |
| #define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */ |
| #define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */ |
| #define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */ |
| #define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */ |
| #define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */ |
| |
| #define AT_XDMAC_MAX_CHAN 0x20 |
| #define AT_XDMAC_MAX_CSIZE 16 /* 16 data */ |
| #define AT_XDMAC_MAX_DWIDTH 8 /* 64 bits */ |
| |
| #define AT_XDMAC_DMA_BUSWIDTHS\ |
| (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\ |
| BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\ |
| BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\ |
| BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\ |
| BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) |
| |
| enum atc_status { |
| AT_XDMAC_CHAN_IS_CYCLIC = 0, |
| AT_XDMAC_CHAN_IS_PAUSED, |
| }; |
| |
| /* ----- Channels ----- */ |
| struct at_xdmac_chan { |
| struct dma_chan chan; |
| void __iomem *ch_regs; |
| u32 mask; /* Channel Mask */ |
| u32 cfg; /* Channel Configuration Register */ |
| u8 perid; /* Peripheral ID */ |
| u8 perif; /* Peripheral Interface */ |
| u8 memif; /* Memory Interface */ |
| u32 save_cc; |
| u32 save_cim; |
| u32 save_cnda; |
| u32 save_cndc; |
| unsigned long status; |
| struct tasklet_struct tasklet; |
| struct dma_slave_config sconfig; |
| |
| spinlock_t lock; |
| |
| struct list_head xfers_list; |
| struct list_head free_descs_list; |
| }; |
| |
| |
| /* ----- Controller ----- */ |
| struct at_xdmac { |
| struct dma_device dma; |
| void __iomem *regs; |
| int irq; |
| struct clk *clk; |
| u32 save_gim; |
| u32 save_gs; |
| struct dma_pool *at_xdmac_desc_pool; |
| struct at_xdmac_chan chan[0]; |
| }; |
| |
| |
| /* ----- Descriptors ----- */ |
| |
| /* Linked List Descriptor */ |
| struct at_xdmac_lld { |
| dma_addr_t mbr_nda; /* Next Descriptor Member */ |
| u32 mbr_ubc; /* Microblock Control Member */ |
| dma_addr_t mbr_sa; /* Source Address Member */ |
| dma_addr_t mbr_da; /* Destination Address Member */ |
| u32 mbr_cfg; /* Configuration Register */ |
| }; |
| |
| |
| struct at_xdmac_desc { |
| struct at_xdmac_lld lld; |
| enum dma_transfer_direction direction; |
| struct dma_async_tx_descriptor tx_dma_desc; |
| struct list_head desc_node; |
| /* Following members are only used by the first descriptor */ |
| bool active_xfer; |
| unsigned int xfer_size; |
| struct list_head descs_list; |
| struct list_head xfer_node; |
| }; |
| |
| static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb) |
| { |
| return atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40); |
| } |
| |
| #define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg)) |
| #define at_xdmac_write(atxdmac, reg, value) \ |
| writel_relaxed((value), (atxdmac)->regs + (reg)) |
| |
| #define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg)) |
| #define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg)) |
| |
| static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan) |
| { |
| return container_of(dchan, struct at_xdmac_chan, chan); |
| } |
| |
| static struct device *chan2dev(struct dma_chan *chan) |
| { |
| return &chan->dev->device; |
| } |
| |
| static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev) |
| { |
| return container_of(ddev, struct at_xdmac, dma); |
| } |
| |
| static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd) |
| { |
| return container_of(txd, struct at_xdmac_desc, tx_dma_desc); |
| } |
| |
| static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan) |
| { |
| return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); |
| } |
| |
| static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan) |
| { |
| return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); |
| } |
| |
| static inline int at_xdmac_csize(u32 maxburst) |
| { |
| int csize; |
| |
| csize = ffs(maxburst) - 1; |
| if (csize > 4) |
| csize = -EINVAL; |
| |
| return csize; |
| }; |
| |
| static inline u8 at_xdmac_get_dwidth(u32 cfg) |
| { |
| return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; |
| }; |
| |
| static unsigned int init_nr_desc_per_channel = 64; |
| module_param(init_nr_desc_per_channel, uint, 0644); |
| MODULE_PARM_DESC(init_nr_desc_per_channel, |
| "initial descriptors per channel (default: 64)"); |
| |
| |
| static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan) |
| { |
| return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask; |
| } |
| |
| static void at_xdmac_off(struct at_xdmac *atxdmac) |
| { |
| at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L); |
| |
| /* Wait that all chans are disabled. */ |
| while (at_xdmac_read(atxdmac, AT_XDMAC_GS)) |
| cpu_relax(); |
| |
| at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L); |
| } |
| |
| /* Call with lock hold. */ |
| static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, |
| struct at_xdmac_desc *first) |
| { |
| struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); |
| u32 reg; |
| |
| dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first); |
| |
| if (at_xdmac_chan_is_enabled(atchan)) |
| return; |
| |
| /* Set transfer as active to not try to start it again. */ |
| first->active_xfer = true; |
| |
| /* Tell xdmac where to get the first descriptor. */ |
| reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys) |
| | AT_XDMAC_CNDA_NDAIF(atchan->memif); |
| at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg); |
| |
| /* |
| * When doing non cyclic transfer we need to use the next |
| * descriptor view 2 since some fields of the configuration register |
| * depend on transfer size and src/dest addresses. |
| */ |
| if (at_xdmac_chan_is_cyclic(atchan)) { |
| reg = AT_XDMAC_CNDC_NDVIEW_NDV1; |
| at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg); |
| } else { |
| /* |
| * No need to write AT_XDMAC_CC reg, it will be done when the |
| * descriptor is fecthed. |
| */ |
| reg = AT_XDMAC_CNDC_NDVIEW_NDV2; |
| } |
| |
| reg |= AT_XDMAC_CNDC_NDDUP |
| | AT_XDMAC_CNDC_NDSUP |
| | AT_XDMAC_CNDC_NDE; |
| at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg); |
| |
| dev_vdbg(chan2dev(&atchan->chan), |
| "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", |
| __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
| |
| at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); |
| reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE; |
| /* |
| * There is no end of list when doing cyclic dma, we need to get |
| * an interrupt after each periods. |
| */ |
| if (at_xdmac_chan_is_cyclic(atchan)) |
| at_xdmac_chan_write(atchan, AT_XDMAC_CIE, |
| reg | AT_XDMAC_CIE_BIE); |
| else |
| at_xdmac_chan_write(atchan, AT_XDMAC_CIE, |
| reg | AT_XDMAC_CIE_LIE); |
| at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); |
| dev_vdbg(chan2dev(&atchan->chan), |
| "%s: enable channel (0x%08x)\n", __func__, atchan->mask); |
| wmb(); |
| at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); |
| |
| dev_vdbg(chan2dev(&atchan->chan), |
| "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", |
| __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
| |
| } |
| |
| static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) |
| { |
| struct at_xdmac_desc *desc = txd_to_at_desc(tx); |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan); |
| dma_cookie_t cookie; |
| unsigned long irqflags; |
| |
| spin_lock_irqsave(&atchan->lock, irqflags); |
| cookie = dma_cookie_assign(tx); |
| |
| dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n", |
| __func__, atchan, desc); |
| list_add_tail(&desc->xfer_node, &atchan->xfers_list); |
| if (list_is_singular(&atchan->xfers_list)) |
| at_xdmac_start_xfer(atchan, desc); |
| |
| spin_unlock_irqrestore(&atchan->lock, irqflags); |
| return cookie; |
| } |
| |
| static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan, |
| gfp_t gfp_flags) |
| { |
| struct at_xdmac_desc *desc; |
| struct at_xdmac *atxdmac = to_at_xdmac(chan->device); |
| dma_addr_t phys; |
| |
| desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys); |
| if (desc) { |
| memset(desc, 0, sizeof(*desc)); |
| INIT_LIST_HEAD(&desc->descs_list); |
| dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan); |
| desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit; |
| desc->tx_dma_desc.phys = phys; |
| } |
| |
| return desc; |
| } |
| |
| /* Call must be protected by lock. */ |
| static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan) |
| { |
| struct at_xdmac_desc *desc; |
| |
| if (list_empty(&atchan->free_descs_list)) { |
| desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT); |
| } else { |
| desc = list_first_entry(&atchan->free_descs_list, |
| struct at_xdmac_desc, desc_node); |
| list_del(&desc->desc_node); |
| desc->active_xfer = false; |
| } |
| |
| return desc; |
| } |
| |
| static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, |
| struct of_dma *of_dma) |
| { |
| struct at_xdmac *atxdmac = of_dma->of_dma_data; |
| struct at_xdmac_chan *atchan; |
| struct dma_chan *chan; |
| struct device *dev = atxdmac->dma.dev; |
| |
| if (dma_spec->args_count != 1) { |
| dev_err(dev, "dma phandler args: bad number of args\n"); |
| return NULL; |
| } |
| |
| chan = dma_get_any_slave_channel(&atxdmac->dma); |
| if (!chan) { |
| dev_err(dev, "can't get a dma channel\n"); |
| return NULL; |
| } |
| |
| atchan = to_at_xdmac_chan(chan); |
| atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]); |
| atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]); |
| atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]); |
| dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n", |
| atchan->memif, atchan->perif, atchan->perid); |
| |
| return chan; |
| } |
| |
| static int at_xdmac_compute_chan_conf(struct dma_chan *chan, |
| enum dma_transfer_direction direction) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| int csize, dwidth; |
| |
| if (direction == DMA_DEV_TO_MEM) { |
| atchan->cfg = |
| AT91_XDMAC_DT_PERID(atchan->perid) |
| | AT_XDMAC_CC_DAM_INCREMENTED_AM |
| | AT_XDMAC_CC_SAM_FIXED_AM |
| | AT_XDMAC_CC_DIF(atchan->memif) |
| | AT_XDMAC_CC_SIF(atchan->perif) |
| | AT_XDMAC_CC_SWREQ_HWR_CONNECTED |
| | AT_XDMAC_CC_DSYNC_PER2MEM |
| | AT_XDMAC_CC_MBSIZE_SIXTEEN |
| | AT_XDMAC_CC_TYPE_PER_TRAN; |
| csize = ffs(atchan->sconfig.src_maxburst) - 1; |
| if (csize < 0) { |
| dev_err(chan2dev(chan), "invalid src maxburst value\n"); |
| return -EINVAL; |
| } |
| atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); |
| dwidth = ffs(atchan->sconfig.src_addr_width) - 1; |
| if (dwidth < 0) { |
| dev_err(chan2dev(chan), "invalid src addr width value\n"); |
| return -EINVAL; |
| } |
| atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); |
| } else if (direction == DMA_MEM_TO_DEV) { |
| atchan->cfg = |
| AT91_XDMAC_DT_PERID(atchan->perid) |
| | AT_XDMAC_CC_DAM_FIXED_AM |
| | AT_XDMAC_CC_SAM_INCREMENTED_AM |
| | AT_XDMAC_CC_DIF(atchan->perif) |
| | AT_XDMAC_CC_SIF(atchan->memif) |
| | AT_XDMAC_CC_SWREQ_HWR_CONNECTED |
| | AT_XDMAC_CC_DSYNC_MEM2PER |
| | AT_XDMAC_CC_MBSIZE_SIXTEEN |
| | AT_XDMAC_CC_TYPE_PER_TRAN; |
| csize = ffs(atchan->sconfig.dst_maxburst) - 1; |
| if (csize < 0) { |
| dev_err(chan2dev(chan), "invalid src maxburst value\n"); |
| return -EINVAL; |
| } |
| atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); |
| dwidth = ffs(atchan->sconfig.dst_addr_width) - 1; |
| if (dwidth < 0) { |
| dev_err(chan2dev(chan), "invalid dst addr width value\n"); |
| return -EINVAL; |
| } |
| atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); |
| } |
| |
| dev_dbg(chan2dev(chan), "%s: cfg=0x%08x\n", __func__, atchan->cfg); |
| |
| return 0; |
| } |
| |
| /* |
| * Only check that maxburst and addr width values are supported by the |
| * the controller but not that the configuration is good to perform the |
| * transfer since we don't know the direction at this stage. |
| */ |
| static int at_xdmac_check_slave_config(struct dma_slave_config *sconfig) |
| { |
| if ((sconfig->src_maxburst > AT_XDMAC_MAX_CSIZE) |
| || (sconfig->dst_maxburst > AT_XDMAC_MAX_CSIZE)) |
| return -EINVAL; |
| |
| if ((sconfig->src_addr_width > AT_XDMAC_MAX_DWIDTH) |
| || (sconfig->dst_addr_width > AT_XDMAC_MAX_DWIDTH)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int at_xdmac_set_slave_config(struct dma_chan *chan, |
| struct dma_slave_config *sconfig) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| |
| if (at_xdmac_check_slave_config(sconfig)) { |
| dev_err(chan2dev(chan), "invalid slave configuration\n"); |
| return -EINVAL; |
| } |
| |
| memcpy(&atchan->sconfig, sconfig, sizeof(atchan->sconfig)); |
| |
| return 0; |
| } |
| |
| static struct dma_async_tx_descriptor * |
| at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, |
| unsigned int sg_len, enum dma_transfer_direction direction, |
| unsigned long flags, void *context) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac_desc *first = NULL, *prev = NULL; |
| struct scatterlist *sg; |
| int i; |
| unsigned int xfer_size = 0; |
| unsigned long irqflags; |
| struct dma_async_tx_descriptor *ret = NULL; |
| |
| if (!sgl) |
| return NULL; |
| |
| if (!is_slave_direction(direction)) { |
| dev_err(chan2dev(chan), "invalid DMA direction\n"); |
| return NULL; |
| } |
| |
| dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n", |
| __func__, sg_len, |
| direction == DMA_MEM_TO_DEV ? "to device" : "from device", |
| flags); |
| |
| /* Protect dma_sconfig field that can be modified by set_slave_conf. */ |
| spin_lock_irqsave(&atchan->lock, irqflags); |
| |
| if (at_xdmac_compute_chan_conf(chan, direction)) |
| goto spin_unlock; |
| |
| /* Prepare descriptors. */ |
| for_each_sg(sgl, sg, sg_len, i) { |
| struct at_xdmac_desc *desc = NULL; |
| u32 len, mem, dwidth, fixed_dwidth; |
| |
| len = sg_dma_len(sg); |
| mem = sg_dma_address(sg); |
| if (unlikely(!len)) { |
| dev_err(chan2dev(chan), "sg data length is zero\n"); |
| goto spin_unlock; |
| } |
| dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n", |
| __func__, i, len, mem); |
| |
| desc = at_xdmac_get_desc(atchan); |
| if (!desc) { |
| dev_err(chan2dev(chan), "can't get descriptor\n"); |
| if (first) |
| list_splice_init(&first->descs_list, &atchan->free_descs_list); |
| goto spin_unlock; |
| } |
| |
| /* Linked list descriptor setup. */ |
| if (direction == DMA_DEV_TO_MEM) { |
| desc->lld.mbr_sa = atchan->sconfig.src_addr; |
| desc->lld.mbr_da = mem; |
| } else { |
| desc->lld.mbr_sa = mem; |
| desc->lld.mbr_da = atchan->sconfig.dst_addr; |
| } |
| dwidth = at_xdmac_get_dwidth(atchan->cfg); |
| fixed_dwidth = IS_ALIGNED(len, 1 << dwidth) |
| ? dwidth |
| : AT_XDMAC_CC_DWIDTH_BYTE; |
| desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */ |
| | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */ |
| | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */ |
| | (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */ |
| | (len >> fixed_dwidth); /* microblock length */ |
| desc->lld.mbr_cfg = (atchan->cfg & ~AT_XDMAC_CC_DWIDTH_MASK) | |
| AT_XDMAC_CC_DWIDTH(fixed_dwidth); |
| dev_dbg(chan2dev(chan), |
| "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", |
| __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); |
| |
| /* Chain lld. */ |
| if (prev) { |
| prev->lld.mbr_nda = desc->tx_dma_desc.phys; |
| dev_dbg(chan2dev(chan), |
| "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", |
| __func__, prev, &prev->lld.mbr_nda); |
| } |
| |
| prev = desc; |
| if (!first) |
| first = desc; |
| |
| dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", |
| __func__, desc, first); |
| list_add_tail(&desc->desc_node, &first->descs_list); |
| xfer_size += len; |
| } |
| |
| |
| first->tx_dma_desc.flags = flags; |
| first->xfer_size = xfer_size; |
| first->direction = direction; |
| ret = &first->tx_dma_desc; |
| |
| spin_unlock: |
| spin_unlock_irqrestore(&atchan->lock, irqflags); |
| return ret; |
| } |
| |
| static struct dma_async_tx_descriptor * |
| at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, |
| size_t buf_len, size_t period_len, |
| enum dma_transfer_direction direction, |
| unsigned long flags) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac_desc *first = NULL, *prev = NULL; |
| unsigned int periods = buf_len / period_len; |
| int i; |
| unsigned long irqflags; |
| |
| dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n", |
| __func__, &buf_addr, buf_len, period_len, |
| direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags); |
| |
| if (!is_slave_direction(direction)) { |
| dev_err(chan2dev(chan), "invalid DMA direction\n"); |
| return NULL; |
| } |
| |
| if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) { |
| dev_err(chan2dev(chan), "channel currently used\n"); |
| return NULL; |
| } |
| |
| if (at_xdmac_compute_chan_conf(chan, direction)) |
| return NULL; |
| |
| for (i = 0; i < periods; i++) { |
| struct at_xdmac_desc *desc = NULL; |
| |
| spin_lock_irqsave(&atchan->lock, irqflags); |
| desc = at_xdmac_get_desc(atchan); |
| if (!desc) { |
| dev_err(chan2dev(chan), "can't get descriptor\n"); |
| if (first) |
| list_splice_init(&first->descs_list, &atchan->free_descs_list); |
| spin_unlock_irqrestore(&atchan->lock, irqflags); |
| return NULL; |
| } |
| spin_unlock_irqrestore(&atchan->lock, irqflags); |
| dev_dbg(chan2dev(chan), |
| "%s: desc=0x%p, tx_dma_desc.phys=%pad\n", |
| __func__, desc, &desc->tx_dma_desc.phys); |
| |
| if (direction == DMA_DEV_TO_MEM) { |
| desc->lld.mbr_sa = atchan->sconfig.src_addr; |
| desc->lld.mbr_da = buf_addr + i * period_len; |
| } else { |
| desc->lld.mbr_sa = buf_addr + i * period_len; |
| desc->lld.mbr_da = atchan->sconfig.dst_addr; |
| } |
| desc->lld.mbr_cfg = atchan->cfg; |
| desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 |
| | AT_XDMAC_MBR_UBC_NDEN |
| | AT_XDMAC_MBR_UBC_NSEN |
| | AT_XDMAC_MBR_UBC_NDE |
| | period_len >> at_xdmac_get_dwidth(desc->lld.mbr_cfg); |
| |
| dev_dbg(chan2dev(chan), |
| "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", |
| __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); |
| |
| /* Chain lld. */ |
| if (prev) { |
| prev->lld.mbr_nda = desc->tx_dma_desc.phys; |
| dev_dbg(chan2dev(chan), |
| "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", |
| __func__, prev, &prev->lld.mbr_nda); |
| } |
| |
| prev = desc; |
| if (!first) |
| first = desc; |
| |
| dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", |
| __func__, desc, first); |
| list_add_tail(&desc->desc_node, &first->descs_list); |
| } |
| |
| prev->lld.mbr_nda = first->tx_dma_desc.phys; |
| dev_dbg(chan2dev(chan), |
| "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", |
| __func__, prev, &prev->lld.mbr_nda); |
| first->tx_dma_desc.flags = flags; |
| first->xfer_size = buf_len; |
| first->direction = direction; |
| |
| return &first->tx_dma_desc; |
| } |
| |
| static struct dma_async_tx_descriptor * |
| at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, |
| size_t len, unsigned long flags) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac_desc *first = NULL, *prev = NULL; |
| size_t remaining_size = len, xfer_size = 0, ublen; |
| dma_addr_t src_addr = src, dst_addr = dest; |
| u32 dwidth; |
| /* |
| * WARNING: We don't know the direction, it involves we can't |
| * dynamically set the source and dest interface so we have to use the |
| * same one. Only interface 0 allows EBI access. Hopefully we can |
| * access DDR through both ports (at least on SAMA5D4x), so we can use |
| * the same interface for source and dest, that solves the fact we |
| * don't know the direction. |
| */ |
| u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM |
| | AT_XDMAC_CC_SAM_INCREMENTED_AM |
| | AT_XDMAC_CC_DIF(0) |
| | AT_XDMAC_CC_SIF(0) |
| | AT_XDMAC_CC_MBSIZE_SIXTEEN |
| | AT_XDMAC_CC_TYPE_MEM_TRAN; |
| unsigned long irqflags; |
| |
| dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n", |
| __func__, &src, &dest, len, flags); |
| |
| if (unlikely(!len)) |
| return NULL; |
| |
| /* |
| * Check address alignment to select the greater data width we can use. |
| * Some XDMAC implementations don't provide dword transfer, in this |
| * case selecting dword has the same behavior as selecting word transfers. |
| */ |
| if (!((src_addr | dst_addr) & 7)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_DWORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); |
| } else if (!((src_addr | dst_addr) & 3)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_WORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); |
| } else if (!((src_addr | dst_addr) & 1)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); |
| } else { |
| dwidth = AT_XDMAC_CC_DWIDTH_BYTE; |
| dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); |
| } |
| |
| /* Prepare descriptors. */ |
| while (remaining_size) { |
| struct at_xdmac_desc *desc = NULL; |
| |
| dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size); |
| |
| spin_lock_irqsave(&atchan->lock, irqflags); |
| desc = at_xdmac_get_desc(atchan); |
| spin_unlock_irqrestore(&atchan->lock, irqflags); |
| if (!desc) { |
| dev_err(chan2dev(chan), "can't get descriptor\n"); |
| if (first) |
| list_splice_init(&first->descs_list, &atchan->free_descs_list); |
| return NULL; |
| } |
| |
| /* Update src and dest addresses. */ |
| src_addr += xfer_size; |
| dst_addr += xfer_size; |
| |
| if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth) |
| xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth; |
| else |
| xfer_size = remaining_size; |
| |
| dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size); |
| |
| /* Check remaining length and change data width if needed. */ |
| if (!((src_addr | dst_addr | xfer_size) & 7)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_DWORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); |
| } else if (!((src_addr | dst_addr | xfer_size) & 3)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_WORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); |
| } else if (!((src_addr | dst_addr | xfer_size) & 1)) { |
| dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; |
| dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); |
| } else if ((src_addr | dst_addr | xfer_size) & 1) { |
| dwidth = AT_XDMAC_CC_DWIDTH_BYTE; |
| dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); |
| } |
| chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); |
| |
| ublen = xfer_size >> dwidth; |
| remaining_size -= xfer_size; |
| |
| desc->lld.mbr_sa = src_addr; |
| desc->lld.mbr_da = dst_addr; |
| desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 |
| | AT_XDMAC_MBR_UBC_NDEN |
| | AT_XDMAC_MBR_UBC_NSEN |
| | (remaining_size ? AT_XDMAC_MBR_UBC_NDE : 0) |
| | ublen; |
| desc->lld.mbr_cfg = chan_cc; |
| |
| dev_dbg(chan2dev(chan), |
| "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n", |
| __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg); |
| |
| /* Chain lld. */ |
| if (prev) { |
| prev->lld.mbr_nda = desc->tx_dma_desc.phys; |
| dev_dbg(chan2dev(chan), |
| "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", |
| __func__, prev, prev->lld.mbr_nda); |
| } |
| |
| prev = desc; |
| if (!first) |
| first = desc; |
| |
| dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", |
| __func__, desc, first); |
| list_add_tail(&desc->desc_node, &first->descs_list); |
| } |
| |
| first->tx_dma_desc.flags = flags; |
| first->xfer_size = len; |
| |
| return &first->tx_dma_desc; |
| } |
| |
| static enum dma_status |
| at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, |
| struct dma_tx_state *txstate) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); |
| struct at_xdmac_desc *desc, *_desc; |
| struct list_head *descs_list; |
| enum dma_status ret; |
| int residue; |
| u32 cur_nda, mask, value; |
| u8 dwidth = 0; |
| unsigned long flags; |
| |
| ret = dma_cookie_status(chan, cookie, txstate); |
| if (ret == DMA_COMPLETE) |
| return ret; |
| |
| if (!txstate) |
| return ret; |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| |
| desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); |
| |
| /* |
| * If the transfer has not been started yet, don't need to compute the |
| * residue, it's the transfer length. |
| */ |
| if (!desc->active_xfer) { |
| dma_set_residue(txstate, desc->xfer_size); |
| goto spin_unlock; |
| } |
| |
| residue = desc->xfer_size; |
| /* |
| * Flush FIFO: only relevant when the transfer is source peripheral |
| * synchronized. |
| */ |
| mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC; |
| value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM; |
| if ((desc->lld.mbr_cfg & mask) == value) { |
| at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask); |
| while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)) |
| cpu_relax(); |
| } |
| |
| cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; |
| /* |
| * Remove size of all microblocks already transferred and the current |
| * one. Then add the remaining size to transfer of the current |
| * microblock. |
| */ |
| descs_list = &desc->descs_list; |
| list_for_each_entry_safe(desc, _desc, descs_list, desc_node) { |
| dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg); |
| residue -= (desc->lld.mbr_ubc & 0xffffff) << dwidth; |
| if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda) |
| break; |
| } |
| residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << dwidth; |
| |
| dma_set_residue(txstate, residue); |
| |
| dev_dbg(chan2dev(chan), |
| "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n", |
| __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue); |
| |
| spin_unlock: |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| return ret; |
| } |
| |
| /* Call must be protected by lock. */ |
| static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan, |
| struct at_xdmac_desc *desc) |
| { |
| dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); |
| |
| /* |
| * Remove the transfer from the transfer list then move the transfer |
| * descriptors into the free descriptors list. |
| */ |
| list_del(&desc->xfer_node); |
| list_splice_init(&desc->descs_list, &atchan->free_descs_list); |
| } |
| |
| static void at_xdmac_advance_work(struct at_xdmac_chan *atchan) |
| { |
| struct at_xdmac_desc *desc; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| |
| /* |
| * If channel is enabled, do nothing, advance_work will be triggered |
| * after the interruption. |
| */ |
| if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) { |
| desc = list_first_entry(&atchan->xfers_list, |
| struct at_xdmac_desc, |
| xfer_node); |
| dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); |
| if (!desc->active_xfer) |
| at_xdmac_start_xfer(atchan, desc); |
| } |
| |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| } |
| |
| static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) |
| { |
| struct at_xdmac_desc *desc; |
| struct dma_async_tx_descriptor *txd; |
| |
| desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); |
| txd = &desc->tx_dma_desc; |
| |
| if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) |
| txd->callback(txd->callback_param); |
| } |
| |
| static void at_xdmac_tasklet(unsigned long data) |
| { |
| struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data; |
| struct at_xdmac_desc *desc; |
| u32 error_mask; |
| |
| dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n", |
| __func__, atchan->status); |
| |
| error_mask = AT_XDMAC_CIS_RBEIS |
| | AT_XDMAC_CIS_WBEIS |
| | AT_XDMAC_CIS_ROIS; |
| |
| if (at_xdmac_chan_is_cyclic(atchan)) { |
| at_xdmac_handle_cyclic(atchan); |
| } else if ((atchan->status & AT_XDMAC_CIS_LIS) |
| || (atchan->status & error_mask)) { |
| struct dma_async_tx_descriptor *txd; |
| |
| if (atchan->status & AT_XDMAC_CIS_RBEIS) |
| dev_err(chan2dev(&atchan->chan), "read bus error!!!"); |
| if (atchan->status & AT_XDMAC_CIS_WBEIS) |
| dev_err(chan2dev(&atchan->chan), "write bus error!!!"); |
| if (atchan->status & AT_XDMAC_CIS_ROIS) |
| dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); |
| |
| spin_lock_bh(&atchan->lock); |
| desc = list_first_entry(&atchan->xfers_list, |
| struct at_xdmac_desc, |
| xfer_node); |
| dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); |
| BUG_ON(!desc->active_xfer); |
| |
| txd = &desc->tx_dma_desc; |
| |
| at_xdmac_remove_xfer(atchan, desc); |
| spin_unlock_bh(&atchan->lock); |
| |
| if (!at_xdmac_chan_is_cyclic(atchan)) { |
| dma_cookie_complete(txd); |
| if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) |
| txd->callback(txd->callback_param); |
| } |
| |
| dma_run_dependencies(txd); |
| |
| at_xdmac_advance_work(atchan); |
| } |
| } |
| |
| static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) |
| { |
| struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id; |
| struct at_xdmac_chan *atchan; |
| u32 imr, status, pending; |
| u32 chan_imr, chan_status; |
| int i, ret = IRQ_NONE; |
| |
| do { |
| imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM); |
| status = at_xdmac_read(atxdmac, AT_XDMAC_GIS); |
| pending = status & imr; |
| |
| dev_vdbg(atxdmac->dma.dev, |
| "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n", |
| __func__, status, imr, pending); |
| |
| if (!pending) |
| break; |
| |
| /* We have to find which channel has generated the interrupt. */ |
| for (i = 0; i < atxdmac->dma.chancnt; i++) { |
| if (!((1 << i) & pending)) |
| continue; |
| |
| atchan = &atxdmac->chan[i]; |
| chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); |
| chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS); |
| atchan->status = chan_status & chan_imr; |
| dev_vdbg(atxdmac->dma.dev, |
| "%s: chan%d: imr=0x%x, status=0x%x\n", |
| __func__, i, chan_imr, chan_status); |
| dev_vdbg(chan2dev(&atchan->chan), |
| "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", |
| __func__, |
| at_xdmac_chan_read(atchan, AT_XDMAC_CC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CSA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CDA), |
| at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); |
| |
| if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS)) |
| at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); |
| |
| tasklet_schedule(&atchan->tasklet); |
| ret = IRQ_HANDLED; |
| } |
| |
| } while (pending); |
| |
| return ret; |
| } |
| |
| static void at_xdmac_issue_pending(struct dma_chan *chan) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| |
| dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__); |
| |
| if (!at_xdmac_chan_is_cyclic(atchan)) |
| at_xdmac_advance_work(atchan); |
| |
| return; |
| } |
| |
| static int at_xdmac_device_config(struct dma_chan *chan, |
| struct dma_slave_config *config) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| int ret; |
| unsigned long flags; |
| |
| dev_dbg(chan2dev(chan), "%s\n", __func__); |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| ret = at_xdmac_set_slave_config(chan, config); |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| |
| return ret; |
| } |
| |
| static int at_xdmac_device_pause(struct dma_chan *chan) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); |
| unsigned long flags; |
| |
| dev_dbg(chan2dev(chan), "%s\n", __func__); |
| |
| if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status)) |
| return 0; |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask); |
| while (at_xdmac_chan_read(atchan, AT_XDMAC_CC) |
| & (AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP)) |
| cpu_relax(); |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| |
| return 0; |
| } |
| |
| static int at_xdmac_device_resume(struct dma_chan *chan) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); |
| unsigned long flags; |
| |
| dev_dbg(chan2dev(chan), "%s\n", __func__); |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| if (!at_xdmac_chan_is_paused(atchan)) { |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| return 0; |
| } |
| |
| at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask); |
| clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| |
| return 0; |
| } |
| |
| static int at_xdmac_device_terminate_all(struct dma_chan *chan) |
| { |
| struct at_xdmac_desc *desc, *_desc; |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); |
| unsigned long flags; |
| |
| dev_dbg(chan2dev(chan), "%s\n", __func__); |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); |
| while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) |
| cpu_relax(); |
| |
| /* Cancel all pending transfers. */ |
| list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) |
| at_xdmac_remove_xfer(atchan, desc); |
| |
| clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| |
| return 0; |
| } |
| |
| static int at_xdmac_alloc_chan_resources(struct dma_chan *chan) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac_desc *desc; |
| int i; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&atchan->lock, flags); |
| |
| if (at_xdmac_chan_is_enabled(atchan)) { |
| dev_err(chan2dev(chan), |
| "can't allocate channel resources (channel enabled)\n"); |
| i = -EIO; |
| goto spin_unlock; |
| } |
| |
| if (!list_empty(&atchan->free_descs_list)) { |
| dev_err(chan2dev(chan), |
| "can't allocate channel resources (channel not free from a previous use)\n"); |
| i = -EIO; |
| goto spin_unlock; |
| } |
| |
| for (i = 0; i < init_nr_desc_per_channel; i++) { |
| desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC); |
| if (!desc) { |
| dev_warn(chan2dev(chan), |
| "only %d descriptors have been allocated\n", i); |
| break; |
| } |
| list_add_tail(&desc->desc_node, &atchan->free_descs_list); |
| } |
| |
| dma_cookie_init(chan); |
| |
| dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); |
| |
| spin_unlock: |
| spin_unlock_irqrestore(&atchan->lock, flags); |
| return i; |
| } |
| |
| static void at_xdmac_free_chan_resources(struct dma_chan *chan) |
| { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| struct at_xdmac *atxdmac = to_at_xdmac(chan->device); |
| struct at_xdmac_desc *desc, *_desc; |
| |
| list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) { |
| dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc); |
| list_del(&desc->desc_node); |
| dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys); |
| } |
| |
| return; |
| } |
| |
| #ifdef CONFIG_PM |
| static int atmel_xdmac_prepare(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct at_xdmac *atxdmac = platform_get_drvdata(pdev); |
| struct dma_chan *chan, *_chan; |
| |
| list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| |
| /* Wait for transfer completion, except in cyclic case. */ |
| if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan)) |
| return -EAGAIN; |
| } |
| return 0; |
| } |
| #else |
| # define atmel_xdmac_prepare NULL |
| #endif |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int atmel_xdmac_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct at_xdmac *atxdmac = platform_get_drvdata(pdev); |
| struct dma_chan *chan, *_chan; |
| |
| list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
| struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); |
| |
| atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC); |
| if (at_xdmac_chan_is_cyclic(atchan)) { |
| if (!at_xdmac_chan_is_paused(atchan)) |
| at_xdmac_device_pause(chan); |
| atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); |
| atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA); |
| atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC); |
| } |
| } |
| atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM); |
| |
| at_xdmac_off(atxdmac); |
| clk_disable_unprepare(atxdmac->clk); |
| return 0; |
| } |
| |
| static int atmel_xdmac_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct at_xdmac *atxdmac = platform_get_drvdata(pdev); |
| struct at_xdmac_chan *atchan; |
| struct dma_chan *chan, *_chan; |
| int i; |
| |
| clk_prepare_enable(atxdmac->clk); |
| |
| /* Clear pending interrupts. */ |
| for (i = 0; i < atxdmac->dma.chancnt; i++) { |
| atchan = &atxdmac->chan[i]; |
| while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) |
| cpu_relax(); |
| } |
| |
| at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim); |
| at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs); |
| list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { |
| atchan = to_at_xdmac_chan(chan); |
| at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc); |
| if (at_xdmac_chan_is_cyclic(atchan)) { |
| at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); |
| at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc); |
| at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim); |
| wmb(); |
| at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); |
| } |
| } |
| return 0; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static int at_xdmac_probe(struct platform_device *pdev) |
| { |
| struct resource *res; |
| struct at_xdmac *atxdmac; |
| int irq, size, nr_channels, i, ret; |
| void __iomem *base; |
| u32 reg; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -EINVAL; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return irq; |
| |
| base = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| /* |
| * Read number of xdmac channels, read helper function can't be used |
| * since atxdmac is not yet allocated and we need to know the number |
| * of channels to do the allocation. |
| */ |
| reg = readl_relaxed(base + AT_XDMAC_GTYPE); |
| nr_channels = AT_XDMAC_NB_CH(reg); |
| if (nr_channels > AT_XDMAC_MAX_CHAN) { |
| dev_err(&pdev->dev, "invalid number of channels (%u)\n", |
| nr_channels); |
| return -EINVAL; |
| } |
| |
| size = sizeof(*atxdmac); |
| size += nr_channels * sizeof(struct at_xdmac_chan); |
| atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); |
| if (!atxdmac) { |
| dev_err(&pdev->dev, "can't allocate at_xdmac structure\n"); |
| return -ENOMEM; |
| } |
| |
| atxdmac->regs = base; |
| atxdmac->irq = irq; |
| |
| atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk"); |
| if (IS_ERR(atxdmac->clk)) { |
| dev_err(&pdev->dev, "can't get dma_clk\n"); |
| return PTR_ERR(atxdmac->clk); |
| } |
| |
| /* Do not use dev res to prevent races with tasklet */ |
| ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac); |
| if (ret) { |
| dev_err(&pdev->dev, "can't request irq\n"); |
| return ret; |
| } |
| |
| ret = clk_prepare_enable(atxdmac->clk); |
| if (ret) { |
| dev_err(&pdev->dev, "can't prepare or enable clock\n"); |
| goto err_free_irq; |
| } |
| |
| atxdmac->at_xdmac_desc_pool = |
| dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, |
| sizeof(struct at_xdmac_desc), 4, 0); |
| if (!atxdmac->at_xdmac_desc_pool) { |
| dev_err(&pdev->dev, "no memory for descriptors dma pool\n"); |
| ret = -ENOMEM; |
| goto err_clk_disable; |
| } |
| |
| dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); |
| dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); |
| dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); |
| /* |
| * Without DMA_PRIVATE the driver is not able to allocate more than |
| * one channel, second allocation fails in private_candidate. |
| */ |
| dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask); |
| atxdmac->dma.dev = &pdev->dev; |
| atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources; |
| atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources; |
| atxdmac->dma.device_tx_status = at_xdmac_tx_status; |
| atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; |
| atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; |
| atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; |
| atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; |
| atxdmac->dma.device_config = at_xdmac_device_config; |
| atxdmac->dma.device_pause = at_xdmac_device_pause; |
| atxdmac->dma.device_resume = at_xdmac_device_resume; |
| atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all; |
| atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; |
| atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; |
| atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); |
| atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; |
| |
| /* Disable all chans and interrupts. */ |
| at_xdmac_off(atxdmac); |
| |
| /* Init channels. */ |
| INIT_LIST_HEAD(&atxdmac->dma.channels); |
| for (i = 0; i < nr_channels; i++) { |
| struct at_xdmac_chan *atchan = &atxdmac->chan[i]; |
| |
| atchan->chan.device = &atxdmac->dma; |
| list_add_tail(&atchan->chan.device_node, |
| &atxdmac->dma.channels); |
| |
| atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i); |
| atchan->mask = 1 << i; |
| |
| spin_lock_init(&atchan->lock); |
| INIT_LIST_HEAD(&atchan->xfers_list); |
| INIT_LIST_HEAD(&atchan->free_descs_list); |
| tasklet_init(&atchan->tasklet, at_xdmac_tasklet, |
| (unsigned long)atchan); |
| |
| /* Clear pending interrupts. */ |
| while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) |
| cpu_relax(); |
| } |
| platform_set_drvdata(pdev, atxdmac); |
| |
| ret = dma_async_device_register(&atxdmac->dma); |
| if (ret) { |
| dev_err(&pdev->dev, "fail to register DMA engine device\n"); |
| goto err_clk_disable; |
| } |
| |
| ret = of_dma_controller_register(pdev->dev.of_node, |
| at_xdmac_xlate, atxdmac); |
| if (ret) { |
| dev_err(&pdev->dev, "could not register of dma controller\n"); |
| goto err_dma_unregister; |
| } |
| |
| dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n", |
| nr_channels, atxdmac->regs); |
| |
| return 0; |
| |
| err_dma_unregister: |
| dma_async_device_unregister(&atxdmac->dma); |
| err_clk_disable: |
| clk_disable_unprepare(atxdmac->clk); |
| err_free_irq: |
| free_irq(atxdmac->irq, atxdmac->dma.dev); |
| return ret; |
| } |
| |
| static int at_xdmac_remove(struct platform_device *pdev) |
| { |
| struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); |
| int i; |
| |
| at_xdmac_off(atxdmac); |
| of_dma_controller_free(pdev->dev.of_node); |
| dma_async_device_unregister(&atxdmac->dma); |
| clk_disable_unprepare(atxdmac->clk); |
| |
| synchronize_irq(atxdmac->irq); |
| |
| free_irq(atxdmac->irq, atxdmac->dma.dev); |
| |
| for (i = 0; i < atxdmac->dma.chancnt; i++) { |
| struct at_xdmac_chan *atchan = &atxdmac->chan[i]; |
| |
| tasklet_kill(&atchan->tasklet); |
| at_xdmac_free_chan_resources(&atchan->chan); |
| } |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = { |
| .prepare = atmel_xdmac_prepare, |
| SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume) |
| }; |
| |
| static const struct of_device_id atmel_xdmac_dt_ids[] = { |
| { |
| .compatible = "atmel,sama5d4-dma", |
| }, { |
| /* sentinel */ |
| } |
| }; |
| MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids); |
| |
| static struct platform_driver at_xdmac_driver = { |
| .probe = at_xdmac_probe, |
| .remove = at_xdmac_remove, |
| .driver = { |
| .name = "at_xdmac", |
| .of_match_table = of_match_ptr(atmel_xdmac_dt_ids), |
| .pm = &atmel_xdmac_dev_pm_ops, |
| } |
| }; |
| |
| static int __init at_xdmac_init(void) |
| { |
| return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe); |
| } |
| subsys_initcall(at_xdmac_init); |
| |
| MODULE_DESCRIPTION("Atmel Extended DMA Controller driver"); |
| MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>"); |
| MODULE_LICENSE("GPL"); |