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Diffstat (limited to 'drivers/dma/st_fdma.h')
| -rw-r--r-- | drivers/dma/st_fdma.h | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/drivers/dma/st_fdma.h b/drivers/dma/st_fdma.h new file mode 100644 index 000000000..c58e00d4a --- /dev/null +++ b/drivers/dma/st_fdma.h @@ -0,0 +1,249 @@ +/* + * DMA driver header for STMicroelectronics STi FDMA controller + * + * Copyright (C) 2014 STMicroelectronics + * + * Author: Ludovic Barre <Ludovic.barre@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#ifndef __DMA_ST_FDMA_H +#define __DMA_ST_FDMA_H + +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/io.h> +#include <linux/remoteproc/st_slim_rproc.h> +#include "virt-dma.h" + +#define ST_FDMA_NR_DREQS 32 +#define FW_NAME_SIZE 30 +#define DRIVER_NAME "st-fdma" + +/** + * struct st_fdma_generic_node - Free running/paced generic node + * + * @length: Length in bytes of a line in a 2D mem to mem + * @sstride: Stride, in bytes, between source lines in a 2D data move + * @dstride: Stride, in bytes, between destination lines in a 2D data move + */ +struct st_fdma_generic_node { + u32 length; + u32 sstride; + u32 dstride; +}; + +/** + * struct st_fdma_hw_node - Node structure used by fdma hw + * + * @next: Pointer to next node + * @control: Transfer Control Parameters + * @nbytes: Number of Bytes to read + * @saddr: Source address + * @daddr: Destination address + * + * @generic: generic node for free running/paced transfert type + * 2 others transfert type are possible, but not yet implemented + * + * The NODE structures must be aligned to a 32 byte boundary + */ +struct st_fdma_hw_node { + u32 next; + u32 control; + u32 nbytes; + u32 saddr; + u32 daddr; + union { + struct st_fdma_generic_node generic; + }; +} __aligned(32); + +/* + * node control parameters + */ +#define FDMA_NODE_CTRL_REQ_MAP_MASK GENMASK(4, 0) +#define FDMA_NODE_CTRL_REQ_MAP_FREE_RUN 0x0 +#define FDMA_NODE_CTRL_REQ_MAP_DREQ(n) ((n)&FDMA_NODE_CTRL_REQ_MAP_MASK) +#define FDMA_NODE_CTRL_REQ_MAP_EXT FDMA_NODE_CTRL_REQ_MAP_MASK +#define FDMA_NODE_CTRL_SRC_MASK GENMASK(6, 5) +#define FDMA_NODE_CTRL_SRC_STATIC BIT(5) +#define FDMA_NODE_CTRL_SRC_INCR BIT(6) +#define FDMA_NODE_CTRL_DST_MASK GENMASK(8, 7) +#define FDMA_NODE_CTRL_DST_STATIC BIT(7) +#define FDMA_NODE_CTRL_DST_INCR BIT(8) +#define FDMA_NODE_CTRL_SECURE BIT(15) +#define FDMA_NODE_CTRL_PAUSE_EON BIT(30) +#define FDMA_NODE_CTRL_INT_EON BIT(31) + +/** + * struct st_fdma_sw_node - descriptor structure for link list + * + * @pdesc: Physical address of desc + * @node: link used for putting this into a channel queue + */ +struct st_fdma_sw_node { + dma_addr_t pdesc; + struct st_fdma_hw_node *desc; +}; + +#define NAME_SZ 10 + +struct st_fdma_driverdata { + u32 id; + char name[NAME_SZ]; +}; + +struct st_fdma_desc { + struct virt_dma_desc vdesc; + struct st_fdma_chan *fchan; + bool iscyclic; + unsigned int n_nodes; + struct st_fdma_sw_node node[]; +}; + +enum st_fdma_type { + ST_FDMA_TYPE_FREE_RUN, + ST_FDMA_TYPE_PACED, +}; + +struct st_fdma_cfg { + struct device_node *of_node; + enum st_fdma_type type; + dma_addr_t dev_addr; + enum dma_transfer_direction dir; + int req_line; /* request line */ + long req_ctrl; /* Request control */ +}; + +struct st_fdma_chan { + struct st_fdma_dev *fdev; + struct dma_pool *node_pool; + struct dma_slave_config scfg; + struct st_fdma_cfg cfg; + + int dreq_line; + + struct virt_dma_chan vchan; + struct st_fdma_desc *fdesc; + enum dma_status status; +}; + +struct st_fdma_dev { + struct device *dev; + const struct st_fdma_driverdata *drvdata; + struct dma_device dma_device; + + struct st_slim_rproc *slim_rproc; + + int irq; + + struct st_fdma_chan *chans; + + spinlock_t dreq_lock; + unsigned long dreq_mask; + + u32 nr_channels; + char fw_name[FW_NAME_SIZE]; +}; + +/* Peripheral Registers*/ + +#define FDMA_CMD_STA_OFST 0xFC0 +#define FDMA_CMD_SET_OFST 0xFC4 +#define FDMA_CMD_CLR_OFST 0xFC8 +#define FDMA_CMD_MASK_OFST 0xFCC +#define FDMA_CMD_START(ch) (0x1 << (ch << 1)) +#define FDMA_CMD_PAUSE(ch) (0x2 << (ch << 1)) +#define FDMA_CMD_FLUSH(ch) (0x3 << (ch << 1)) + +#define FDMA_INT_STA_OFST 0xFD0 +#define FDMA_INT_STA_CH 0x1 +#define FDMA_INT_STA_ERR 0x2 + +#define FDMA_INT_SET_OFST 0xFD4 +#define FDMA_INT_CLR_OFST 0xFD8 +#define FDMA_INT_MASK_OFST 0xFDC + +#define fdma_read(fdev, name) \ + readl((fdev)->slim_rproc->peri + name) + +#define fdma_write(fdev, val, name) \ + writel((val), (fdev)->slim_rproc->peri + name) + +/* fchan interface (dmem) */ +#define FDMA_CH_CMD_OFST 0x200 +#define FDMA_CH_CMD_STA_MASK GENMASK(1, 0) +#define FDMA_CH_CMD_STA_IDLE (0x0) +#define FDMA_CH_CMD_STA_START (0x1) +#define FDMA_CH_CMD_STA_RUNNING (0x2) +#define FDMA_CH_CMD_STA_PAUSED (0x3) +#define FDMA_CH_CMD_ERR_MASK GENMASK(4, 2) +#define FDMA_CH_CMD_ERR_INT (0x0 << 2) +#define FDMA_CH_CMD_ERR_NAND (0x1 << 2) +#define FDMA_CH_CMD_ERR_MCHI (0x2 << 2) +#define FDMA_CH_CMD_DATA_MASK GENMASK(31, 5) +#define fchan_read(fchan, name) \ + readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \ + + (fchan)->vchan.chan.chan_id * 0x4 \ + + name) + +#define fchan_write(fchan, val, name) \ + writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \ + + (fchan)->vchan.chan.chan_id * 0x4 \ + + name) + +/* req interface */ +#define FDMA_REQ_CTRL_OFST 0x240 +#define dreq_write(fchan, val, name) \ + writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \ + + fchan->dreq_line * 0x04 \ + + name) +/* node interface */ +#define FDMA_NODE_SZ 128 +#define FDMA_PTRN_OFST 0x800 +#define FDMA_CNTN_OFST 0x808 +#define FDMA_SADDRN_OFST 0x80c +#define FDMA_DADDRN_OFST 0x810 +#define fnode_read(fchan, name) \ + readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \ + + (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \ + + name) + +#define fnode_write(fchan, val, name) \ + writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \ + + (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \ + + name) + +/* + * request control bits + */ +#define FDMA_REQ_CTRL_NUM_OPS_MASK GENMASK(31, 24) +#define FDMA_REQ_CTRL_NUM_OPS(n) (FDMA_REQ_CTRL_NUM_OPS_MASK & \ + ((n) << 24)) +#define FDMA_REQ_CTRL_INITIATOR_MASK BIT(22) +#define FDMA_REQ_CTRL_INIT0 (0x0 << 22) +#define FDMA_REQ_CTRL_INIT1 (0x1 << 22) +#define FDMA_REQ_CTRL_INC_ADDR_ON BIT(21) +#define FDMA_REQ_CTRL_DATA_SWAP_ON BIT(17) +#define FDMA_REQ_CTRL_WNR BIT(14) +#define FDMA_REQ_CTRL_OPCODE_MASK GENMASK(7, 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST1 (0x0 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST2 (0x1 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST4 (0x2 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST8 (0x3 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST16 (0x4 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST32 (0x5 << 4) +#define FDMA_REQ_CTRL_OPCODE_LD_ST64 (0x6 << 4) +#define FDMA_REQ_CTRL_HOLDOFF_MASK GENMASK(2, 0) +#define FDMA_REQ_CTRL_HOLDOFF(n) ((n) & FDMA_REQ_CTRL_HOLDOFF_MASK) + +/* bits used by client to configure request control */ +#define FDMA_REQ_CTRL_CFG_MASK (FDMA_REQ_CTRL_HOLDOFF_MASK | \ + FDMA_REQ_CTRL_DATA_SWAP_ON | \ + FDMA_REQ_CTRL_INC_ADDR_ON | \ + FDMA_REQ_CTRL_INITIATOR_MASK) + +#endif /* __DMA_ST_FDMA_H */ |