287 lines
8.3 KiB
C
287 lines
8.3 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC X100 DMA Driver.
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*
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* Adapted from IOAT dma driver.
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*/
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#ifndef _MIC_X100_DMA_H_
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#define _MIC_X100_DMA_H_
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/mic_bus.h>
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#include "dmaengine.h"
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/*
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* MIC has a total of 8 dma channels.
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* Four channels are assigned for host SW use & the remaining for MIC SW.
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* MIC DMA transfer size & addresses need to be 64 byte aligned.
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*/
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#define MIC_DMA_MAX_NUM_CHAN 8
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#define MIC_DMA_NUM_CHAN 4
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#define MIC_DMA_ALIGN_SHIFT 6
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#define MIC_DMA_ALIGN_BYTES (1 << MIC_DMA_ALIGN_SHIFT)
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#define MIC_DMA_DESC_RX_SIZE (128 * 1024 - 4)
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/*
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* Register descriptions
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* All the registers are 32 bit registers.
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* DCR is a global register and all others are per-channel.
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* DCR - bits 0, 2, 4, 6, 8, 10, 12, 14 - enable bits for channels 0 to 7
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* bits 1, 3, 5, 7, 9, 11, 13, 15 - owner bits for channels 0 to 7
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* DCAR - bit 24 & 25 interrupt masks for mic owned & host owned channels
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* DHPR - head of the descriptor ring updated by s/w
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* DTPR - tail of the descriptor ring updated by h/w
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* DRAR_LO - lower 32 bits of descriptor ring's mic address
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* DRAR_HI - 3:0 - remaining 4 bits of descriptor ring's mic address
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* 20:4 descriptor ring size
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* 25:21 mic smpt entry number
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* DSTAT - 16:0 h/w completion count; 31:28 dma engine status
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* DCHERR - this register is non-zero on error
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* DCHERRMSK - interrupt mask register
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*/
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#define MIC_DMA_HW_CMP_CNT_MASK 0x1ffff
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#define MIC_DMA_CHAN_QUIESCE 0x20000000
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#define MIC_DMA_SBOX_BASE 0x00010000
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#define MIC_DMA_SBOX_DCR 0x0000A280
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#define MIC_DMA_SBOX_CH_BASE 0x0001A000
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#define MIC_DMA_SBOX_CHAN_OFF 0x40
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#define MIC_DMA_SBOX_DCAR_IM0 (0x1 << 24)
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#define MIC_DMA_SBOX_DCAR_IM1 (0x1 << 25)
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#define MIC_DMA_SBOX_DRARHI_SYS_MASK (0x1 << 26)
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#define MIC_DMA_REG_DCAR 0
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#define MIC_DMA_REG_DHPR 4
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#define MIC_DMA_REG_DTPR 8
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#define MIC_DMA_REG_DRAR_LO 20
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#define MIC_DMA_REG_DRAR_HI 24
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#define MIC_DMA_REG_DSTAT 32
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#define MIC_DMA_REG_DCHERR 44
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#define MIC_DMA_REG_DCHERRMSK 48
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/* HW dma desc */
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struct mic_dma_desc {
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u64 qw0;
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u64 qw1;
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};
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enum mic_dma_chan_owner {
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MIC_DMA_CHAN_MIC = 0,
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MIC_DMA_CHAN_HOST
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};
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/*
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* mic_dma_chan - channel specific information
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* @ch_num: channel number
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* @owner: owner of this channel
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* @last_tail: cached value of descriptor ring tail
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* @head: index of next descriptor in desc_ring
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* @issued: hardware notification point
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* @submitted: index that will be used to submit descriptors to h/w
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* @api_ch: dma engine api channel
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* @desc_ring: dma descriptor ring
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* @desc_ring_micpa: mic physical address of desc_ring
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* @status_dest: destination for status (fence) descriptor
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* @status_dest_micpa: mic address for status_dest,
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* DMA controller uses this address
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* @tx_array: array of async_tx
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* @cleanup_lock: lock held when processing completed tx
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* @prep_lock: lock held in prep_memcpy & released in tx_submit
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* @issue_lock: lock used to synchronize writes to head
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* @cookie: mic_irq cookie used with mic irq request
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*/
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struct mic_dma_chan {
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int ch_num;
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enum mic_dma_chan_owner owner;
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u32 last_tail;
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u32 head;
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u32 issued;
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u32 submitted;
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struct dma_chan api_ch;
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struct mic_dma_desc *desc_ring;
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dma_addr_t desc_ring_micpa;
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u64 *status_dest;
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dma_addr_t status_dest_micpa;
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struct dma_async_tx_descriptor *tx_array;
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spinlock_t cleanup_lock;
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spinlock_t prep_lock;
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spinlock_t issue_lock;
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struct mic_irq *cookie;
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};
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/*
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* struct mic_dma_device - per mic device
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* @mic_ch: dma channels
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* @dma_dev: underlying dma device
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* @mbdev: mic bus dma device
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* @mmio: virtual address of the mmio space
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* @dbg_dir: debugfs directory
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* @start_ch: first channel number that can be used
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* @max_xfer_size: maximum transfer size per dma descriptor
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*/
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struct mic_dma_device {
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struct mic_dma_chan mic_ch[MIC_DMA_MAX_NUM_CHAN];
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struct dma_device dma_dev;
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struct mbus_device *mbdev;
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void __iomem *mmio;
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struct dentry *dbg_dir;
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int start_ch;
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size_t max_xfer_size;
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};
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static inline struct mic_dma_chan *to_mic_dma_chan(struct dma_chan *ch)
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{
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return container_of(ch, struct mic_dma_chan, api_ch);
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}
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static inline struct mic_dma_device *to_mic_dma_dev(struct mic_dma_chan *ch)
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{
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return
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container_of((const typeof(((struct mic_dma_device *)0)->mic_ch)*)
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(ch - ch->ch_num), struct mic_dma_device, mic_ch);
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}
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static inline struct mbus_device *to_mbus_device(struct mic_dma_chan *ch)
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{
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return to_mic_dma_dev(ch)->mbdev;
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}
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static inline struct mbus_hw_ops *to_mbus_hw_ops(struct mic_dma_chan *ch)
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{
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return to_mbus_device(ch)->hw_ops;
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}
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static inline struct device *mic_dma_ch_to_device(struct mic_dma_chan *ch)
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{
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return to_mic_dma_dev(ch)->dma_dev.dev;
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}
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static inline void __iomem *mic_dma_chan_to_mmio(struct mic_dma_chan *ch)
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{
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return to_mic_dma_dev(ch)->mmio;
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}
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static inline u32 mic_dma_read_reg(struct mic_dma_chan *ch, u32 reg)
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{
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return ioread32(mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE +
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ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg);
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}
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static inline void mic_dma_write_reg(struct mic_dma_chan *ch, u32 reg, u32 val)
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{
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iowrite32(val, mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE +
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ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg);
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}
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static inline u32 mic_dma_mmio_read(struct mic_dma_chan *ch, u32 offset)
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{
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return ioread32(mic_dma_chan_to_mmio(ch) + offset);
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}
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static inline void mic_dma_mmio_write(struct mic_dma_chan *ch, u32 val,
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u32 offset)
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{
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iowrite32(val, mic_dma_chan_to_mmio(ch) + offset);
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}
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static inline u32 mic_dma_read_cmp_cnt(struct mic_dma_chan *ch)
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{
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return mic_dma_read_reg(ch, MIC_DMA_REG_DSTAT) &
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MIC_DMA_HW_CMP_CNT_MASK;
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}
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static inline void mic_dma_chan_set_owner(struct mic_dma_chan *ch)
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{
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u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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u32 chan_num = ch->ch_num;
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dcr = (dcr & ~(0x1 << (chan_num * 2))) | (ch->owner << (chan_num * 2));
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mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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}
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static inline void mic_dma_enable_chan(struct mic_dma_chan *ch)
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{
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u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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dcr |= 2 << (ch->ch_num << 1);
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mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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}
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static inline void mic_dma_disable_chan(struct mic_dma_chan *ch)
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{
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u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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dcr &= ~(2 << (ch->ch_num << 1));
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mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR);
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}
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static void mic_dma_chan_set_desc_ring(struct mic_dma_chan *ch)
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{
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u32 drar_hi;
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dma_addr_t desc_ring_micpa = ch->desc_ring_micpa;
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drar_hi = (MIC_DMA_DESC_RX_SIZE & 0x1ffff) << 4;
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if (MIC_DMA_CHAN_MIC == ch->owner) {
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drar_hi |= (desc_ring_micpa >> 32) & 0xf;
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} else {
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drar_hi |= MIC_DMA_SBOX_DRARHI_SYS_MASK;
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drar_hi |= ((desc_ring_micpa >> 34)
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& 0x1f) << 21;
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drar_hi |= (desc_ring_micpa >> 32) & 0x3;
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}
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mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_LO, (u32) desc_ring_micpa);
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mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_HI, drar_hi);
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}
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static inline void mic_dma_chan_mask_intr(struct mic_dma_chan *ch)
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{
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u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR);
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if (MIC_DMA_CHAN_MIC == ch->owner)
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dcar |= MIC_DMA_SBOX_DCAR_IM0;
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else
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dcar |= MIC_DMA_SBOX_DCAR_IM1;
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mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar);
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}
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static inline void mic_dma_chan_unmask_intr(struct mic_dma_chan *ch)
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{
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u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR);
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if (MIC_DMA_CHAN_MIC == ch->owner)
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dcar &= ~MIC_DMA_SBOX_DCAR_IM0;
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else
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dcar &= ~MIC_DMA_SBOX_DCAR_IM1;
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mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar);
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}
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static void mic_dma_ack_interrupt(struct mic_dma_chan *ch)
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{
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if (MIC_DMA_CHAN_MIC == ch->owner) {
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/* HW errata */
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mic_dma_chan_mask_intr(ch);
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mic_dma_chan_unmask_intr(ch);
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}
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to_mbus_hw_ops(ch)->ack_interrupt(to_mbus_device(ch), ch->ch_num);
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}
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#endif
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