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![Allen Pais](/assets/img/avatar_default.png)
In preparation for unconditionally passing the struct tasklet_struct pointer to all tasklet callbacks, switch to using the new tasklet_setup() and from_tasklet() to pass the tasklet pointer explicitly. Signed-off-by: Romain Perier <romain.perier@gmail.com> Signed-off-by: Allen Pais <allen.lkml@gmail.com> Link: https://lore.kernel.org/r/20200831103542.305571-20-allen.lkml@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
995 lines
25 KiB
C
995 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Topcliff PCH DMA controller driver
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* Copyright (c) 2010 Intel Corporation
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* Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
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*/
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/pch_dma.h>
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#include "dmaengine.h"
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#define DRV_NAME "pch-dma"
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#define DMA_CTL0_DISABLE 0x0
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#define DMA_CTL0_SG 0x1
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#define DMA_CTL0_ONESHOT 0x2
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#define DMA_CTL0_MODE_MASK_BITS 0x3
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#define DMA_CTL0_DIR_SHIFT_BITS 2
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#define DMA_CTL0_BITS_PER_CH 4
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#define DMA_CTL2_START_SHIFT_BITS 8
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#define DMA_CTL2_IRQ_ENABLE_MASK ((1UL << DMA_CTL2_START_SHIFT_BITS) - 1)
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#define DMA_STATUS_IDLE 0x0
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#define DMA_STATUS_DESC_READ 0x1
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#define DMA_STATUS_WAIT 0x2
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#define DMA_STATUS_ACCESS 0x3
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#define DMA_STATUS_BITS_PER_CH 2
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#define DMA_STATUS_MASK_BITS 0x3
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#define DMA_STATUS_SHIFT_BITS 16
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#define DMA_STATUS_IRQ(x) (0x1 << (x))
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#define DMA_STATUS0_ERR(x) (0x1 << ((x) + 8))
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#define DMA_STATUS2_ERR(x) (0x1 << (x))
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#define DMA_DESC_WIDTH_SHIFT_BITS 12
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#define DMA_DESC_WIDTH_1_BYTE (0x3 << DMA_DESC_WIDTH_SHIFT_BITS)
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#define DMA_DESC_WIDTH_2_BYTES (0x2 << DMA_DESC_WIDTH_SHIFT_BITS)
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#define DMA_DESC_WIDTH_4_BYTES (0x0 << DMA_DESC_WIDTH_SHIFT_BITS)
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#define DMA_DESC_MAX_COUNT_1_BYTE 0x3FF
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#define DMA_DESC_MAX_COUNT_2_BYTES 0x3FF
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#define DMA_DESC_MAX_COUNT_4_BYTES 0x7FF
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#define DMA_DESC_END_WITHOUT_IRQ 0x0
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#define DMA_DESC_END_WITH_IRQ 0x1
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#define DMA_DESC_FOLLOW_WITHOUT_IRQ 0x2
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#define DMA_DESC_FOLLOW_WITH_IRQ 0x3
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#define MAX_CHAN_NR 12
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#define DMA_MASK_CTL0_MODE 0x33333333
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#define DMA_MASK_CTL2_MODE 0x00003333
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static unsigned int init_nr_desc_per_channel = 64;
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module_param(init_nr_desc_per_channel, uint, 0644);
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MODULE_PARM_DESC(init_nr_desc_per_channel,
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"initial descriptors per channel (default: 64)");
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struct pch_dma_desc_regs {
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u32 dev_addr;
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u32 mem_addr;
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u32 size;
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u32 next;
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};
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struct pch_dma_regs {
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u32 dma_ctl0;
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u32 dma_ctl1;
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u32 dma_ctl2;
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u32 dma_ctl3;
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u32 dma_sts0;
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u32 dma_sts1;
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u32 dma_sts2;
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u32 reserved3;
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struct pch_dma_desc_regs desc[MAX_CHAN_NR];
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};
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struct pch_dma_desc {
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struct pch_dma_desc_regs regs;
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struct dma_async_tx_descriptor txd;
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struct list_head desc_node;
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struct list_head tx_list;
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};
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struct pch_dma_chan {
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struct dma_chan chan;
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void __iomem *membase;
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enum dma_transfer_direction dir;
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struct tasklet_struct tasklet;
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unsigned long err_status;
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spinlock_t lock;
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struct list_head active_list;
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struct list_head queue;
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struct list_head free_list;
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unsigned int descs_allocated;
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};
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#define PDC_DEV_ADDR 0x00
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#define PDC_MEM_ADDR 0x04
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#define PDC_SIZE 0x08
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#define PDC_NEXT 0x0C
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#define channel_readl(pdc, name) \
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readl((pdc)->membase + PDC_##name)
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#define channel_writel(pdc, name, val) \
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writel((val), (pdc)->membase + PDC_##name)
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struct pch_dma {
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struct dma_device dma;
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void __iomem *membase;
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struct dma_pool *pool;
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struct pch_dma_regs regs;
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struct pch_dma_desc_regs ch_regs[MAX_CHAN_NR];
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struct pch_dma_chan channels[MAX_CHAN_NR];
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};
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#define PCH_DMA_CTL0 0x00
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#define PCH_DMA_CTL1 0x04
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#define PCH_DMA_CTL2 0x08
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#define PCH_DMA_CTL3 0x0C
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#define PCH_DMA_STS0 0x10
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#define PCH_DMA_STS1 0x14
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#define PCH_DMA_STS2 0x18
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#define dma_readl(pd, name) \
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readl((pd)->membase + PCH_DMA_##name)
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#define dma_writel(pd, name, val) \
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writel((val), (pd)->membase + PCH_DMA_##name)
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static inline
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struct pch_dma_desc *to_pd_desc(struct dma_async_tx_descriptor *txd)
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{
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return container_of(txd, struct pch_dma_desc, txd);
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}
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static inline struct pch_dma_chan *to_pd_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct pch_dma_chan, chan);
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}
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static inline struct pch_dma *to_pd(struct dma_device *ddev)
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{
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return container_of(ddev, struct pch_dma, dma);
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}
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static inline struct device *chan2dev(struct dma_chan *chan)
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{
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return &chan->dev->device;
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}
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static inline struct device *chan2parent(struct dma_chan *chan)
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{
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return chan->dev->device.parent;
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}
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static inline
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struct pch_dma_desc *pdc_first_active(struct pch_dma_chan *pd_chan)
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{
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return list_first_entry(&pd_chan->active_list,
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struct pch_dma_desc, desc_node);
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}
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static inline
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struct pch_dma_desc *pdc_first_queued(struct pch_dma_chan *pd_chan)
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{
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return list_first_entry(&pd_chan->queue,
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struct pch_dma_desc, desc_node);
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}
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static void pdc_enable_irq(struct dma_chan *chan, int enable)
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{
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struct pch_dma *pd = to_pd(chan->device);
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u32 val;
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int pos;
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if (chan->chan_id < 8)
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pos = chan->chan_id;
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else
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pos = chan->chan_id + 8;
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val = dma_readl(pd, CTL2);
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if (enable)
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val |= 0x1 << pos;
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else
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val &= ~(0x1 << pos);
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dma_writel(pd, CTL2, val);
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dev_dbg(chan2dev(chan), "pdc_enable_irq: chan %d -> %x\n",
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chan->chan_id, val);
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}
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static void pdc_set_dir(struct dma_chan *chan)
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{
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struct pch_dma_chan *pd_chan = to_pd_chan(chan);
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struct pch_dma *pd = to_pd(chan->device);
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u32 val;
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u32 mask_mode;
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u32 mask_ctl;
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if (chan->chan_id < 8) {
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val = dma_readl(pd, CTL0);
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mask_mode = DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * chan->chan_id);
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mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * chan->chan_id));
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val &= mask_mode;
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if (pd_chan->dir == DMA_MEM_TO_DEV)
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val |= 0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
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DMA_CTL0_DIR_SHIFT_BITS);
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else
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val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +
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DMA_CTL0_DIR_SHIFT_BITS));
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val |= mask_ctl;
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dma_writel(pd, CTL0, val);
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} else {
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int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */
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val = dma_readl(pd, CTL3);
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mask_mode = DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * ch);
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mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * ch));
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val &= mask_mode;
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if (pd_chan->dir == DMA_MEM_TO_DEV)
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val |= 0x1 << (DMA_CTL0_BITS_PER_CH * ch +
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DMA_CTL0_DIR_SHIFT_BITS);
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else
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val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * ch +
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DMA_CTL0_DIR_SHIFT_BITS));
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val |= mask_ctl;
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dma_writel(pd, CTL3, val);
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}
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dev_dbg(chan2dev(chan), "pdc_set_dir: chan %d -> %x\n",
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chan->chan_id, val);
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}
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static void pdc_set_mode(struct dma_chan *chan, u32 mode)
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{
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struct pch_dma *pd = to_pd(chan->device);
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u32 val;
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u32 mask_ctl;
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u32 mask_dir;
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if (chan->chan_id < 8) {
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mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * chan->chan_id));
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mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +\
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DMA_CTL0_DIR_SHIFT_BITS);
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val = dma_readl(pd, CTL0);
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val &= mask_dir;
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val |= mode << (DMA_CTL0_BITS_PER_CH * chan->chan_id);
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val |= mask_ctl;
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dma_writel(pd, CTL0, val);
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} else {
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int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */
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mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS <<
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(DMA_CTL0_BITS_PER_CH * ch));
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mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * ch +\
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DMA_CTL0_DIR_SHIFT_BITS);
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val = dma_readl(pd, CTL3);
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val &= mask_dir;
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val |= mode << (DMA_CTL0_BITS_PER_CH * ch);
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val |= mask_ctl;
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dma_writel(pd, CTL3, val);
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}
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dev_dbg(chan2dev(chan), "pdc_set_mode: chan %d -> %x\n",
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chan->chan_id, val);
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}
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static u32 pdc_get_status0(struct pch_dma_chan *pd_chan)
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{
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struct pch_dma *pd = to_pd(pd_chan->chan.device);
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u32 val;
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val = dma_readl(pd, STS0);
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return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
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DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id));
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}
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static u32 pdc_get_status2(struct pch_dma_chan *pd_chan)
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{
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struct pch_dma *pd = to_pd(pd_chan->chan.device);
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u32 val;
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val = dma_readl(pd, STS2);
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return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +
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DMA_STATUS_BITS_PER_CH * (pd_chan->chan.chan_id - 8)));
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}
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static bool pdc_is_idle(struct pch_dma_chan *pd_chan)
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{
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u32 sts;
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if (pd_chan->chan.chan_id < 8)
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sts = pdc_get_status0(pd_chan);
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else
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sts = pdc_get_status2(pd_chan);
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if (sts == DMA_STATUS_IDLE)
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return true;
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else
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return false;
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}
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static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
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{
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if (!pdc_is_idle(pd_chan)) {
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dev_err(chan2dev(&pd_chan->chan),
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"BUG: Attempt to start non-idle channel\n");
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return;
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}
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dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n",
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pd_chan->chan.chan_id, desc->regs.dev_addr);
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dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n",
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pd_chan->chan.chan_id, desc->regs.mem_addr);
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dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> size: %x\n",
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pd_chan->chan.chan_id, desc->regs.size);
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dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n",
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pd_chan->chan.chan_id, desc->regs.next);
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if (list_empty(&desc->tx_list)) {
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channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
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channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
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channel_writel(pd_chan, SIZE, desc->regs.size);
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channel_writel(pd_chan, NEXT, desc->regs.next);
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pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT);
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} else {
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channel_writel(pd_chan, NEXT, desc->txd.phys);
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pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
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}
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}
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static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
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struct pch_dma_desc *desc)
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{
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struct dma_async_tx_descriptor *txd = &desc->txd;
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struct dmaengine_desc_callback cb;
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dmaengine_desc_get_callback(txd, &cb);
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list_splice_init(&desc->tx_list, &pd_chan->free_list);
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list_move(&desc->desc_node, &pd_chan->free_list);
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dmaengine_desc_callback_invoke(&cb, NULL);
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}
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static void pdc_complete_all(struct pch_dma_chan *pd_chan)
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{
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struct pch_dma_desc *desc, *_d;
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LIST_HEAD(list);
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BUG_ON(!pdc_is_idle(pd_chan));
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if (!list_empty(&pd_chan->queue))
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pdc_dostart(pd_chan, pdc_first_queued(pd_chan));
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list_splice_init(&pd_chan->active_list, &list);
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list_splice_init(&pd_chan->queue, &pd_chan->active_list);
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list_for_each_entry_safe(desc, _d, &list, desc_node)
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pdc_chain_complete(pd_chan, desc);
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}
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static void pdc_handle_error(struct pch_dma_chan *pd_chan)
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{
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struct pch_dma_desc *bad_desc;
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bad_desc = pdc_first_active(pd_chan);
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list_del(&bad_desc->desc_node);
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list_splice_init(&pd_chan->queue, pd_chan->active_list.prev);
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if (!list_empty(&pd_chan->active_list))
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pdc_dostart(pd_chan, pdc_first_active(pd_chan));
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dev_crit(chan2dev(&pd_chan->chan), "Bad descriptor submitted\n");
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dev_crit(chan2dev(&pd_chan->chan), "descriptor cookie: %d\n",
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bad_desc->txd.cookie);
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pdc_chain_complete(pd_chan, bad_desc);
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}
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static void pdc_advance_work(struct pch_dma_chan *pd_chan)
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{
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if (list_empty(&pd_chan->active_list) ||
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list_is_singular(&pd_chan->active_list)) {
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pdc_complete_all(pd_chan);
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} else {
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pdc_chain_complete(pd_chan, pdc_first_active(pd_chan));
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pdc_dostart(pd_chan, pdc_first_active(pd_chan));
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}
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}
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static dma_cookie_t pd_tx_submit(struct dma_async_tx_descriptor *txd)
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{
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struct pch_dma_desc *desc = to_pd_desc(txd);
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struct pch_dma_chan *pd_chan = to_pd_chan(txd->chan);
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spin_lock(&pd_chan->lock);
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if (list_empty(&pd_chan->active_list)) {
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list_add_tail(&desc->desc_node, &pd_chan->active_list);
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pdc_dostart(pd_chan, desc);
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} else {
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list_add_tail(&desc->desc_node, &pd_chan->queue);
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}
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spin_unlock(&pd_chan->lock);
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return 0;
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}
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static struct pch_dma_desc *pdc_alloc_desc(struct dma_chan *chan, gfp_t flags)
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{
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struct pch_dma_desc *desc = NULL;
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struct pch_dma *pd = to_pd(chan->device);
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dma_addr_t addr;
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desc = dma_pool_zalloc(pd->pool, flags, &addr);
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if (desc) {
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INIT_LIST_HEAD(&desc->tx_list);
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dma_async_tx_descriptor_init(&desc->txd, chan);
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desc->txd.tx_submit = pd_tx_submit;
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desc->txd.flags = DMA_CTRL_ACK;
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desc->txd.phys = addr;
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}
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return desc;
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}
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static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan)
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{
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struct pch_dma_desc *desc, *_d;
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struct pch_dma_desc *ret = NULL;
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int i = 0;
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spin_lock(&pd_chan->lock);
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list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) {
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i++;
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if (async_tx_test_ack(&desc->txd)) {
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list_del(&desc->desc_node);
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ret = desc;
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break;
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}
|
|
dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc);
|
|
}
|
|
spin_unlock(&pd_chan->lock);
|
|
dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i);
|
|
|
|
if (!ret) {
|
|
ret = pdc_alloc_desc(&pd_chan->chan, GFP_ATOMIC);
|
|
if (ret) {
|
|
spin_lock(&pd_chan->lock);
|
|
pd_chan->descs_allocated++;
|
|
spin_unlock(&pd_chan->lock);
|
|
} else {
|
|
dev_err(chan2dev(&pd_chan->chan),
|
|
"failed to alloc desc\n");
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void pdc_desc_put(struct pch_dma_chan *pd_chan,
|
|
struct pch_dma_desc *desc)
|
|
{
|
|
if (desc) {
|
|
spin_lock(&pd_chan->lock);
|
|
list_splice_init(&desc->tx_list, &pd_chan->free_list);
|
|
list_add(&desc->desc_node, &pd_chan->free_list);
|
|
spin_unlock(&pd_chan->lock);
|
|
}
|
|
}
|
|
|
|
static int pd_alloc_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
|
|
struct pch_dma_desc *desc;
|
|
LIST_HEAD(tmp_list);
|
|
int i;
|
|
|
|
if (!pdc_is_idle(pd_chan)) {
|
|
dev_dbg(chan2dev(chan), "DMA channel not idle ?\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (!list_empty(&pd_chan->free_list))
|
|
return pd_chan->descs_allocated;
|
|
|
|
for (i = 0; i < init_nr_desc_per_channel; i++) {
|
|
desc = pdc_alloc_desc(chan, GFP_KERNEL);
|
|
|
|
if (!desc) {
|
|
dev_warn(chan2dev(chan),
|
|
"Only allocated %d initial descriptors\n", i);
|
|
break;
|
|
}
|
|
|
|
list_add_tail(&desc->desc_node, &tmp_list);
|
|
}
|
|
|
|
spin_lock_irq(&pd_chan->lock);
|
|
list_splice(&tmp_list, &pd_chan->free_list);
|
|
pd_chan->descs_allocated = i;
|
|
dma_cookie_init(chan);
|
|
spin_unlock_irq(&pd_chan->lock);
|
|
|
|
pdc_enable_irq(chan, 1);
|
|
|
|
return pd_chan->descs_allocated;
|
|
}
|
|
|
|
static void pd_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
|
|
struct pch_dma *pd = to_pd(chan->device);
|
|
struct pch_dma_desc *desc, *_d;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
BUG_ON(!pdc_is_idle(pd_chan));
|
|
BUG_ON(!list_empty(&pd_chan->active_list));
|
|
BUG_ON(!list_empty(&pd_chan->queue));
|
|
|
|
spin_lock_irq(&pd_chan->lock);
|
|
list_splice_init(&pd_chan->free_list, &tmp_list);
|
|
pd_chan->descs_allocated = 0;
|
|
spin_unlock_irq(&pd_chan->lock);
|
|
|
|
list_for_each_entry_safe(desc, _d, &tmp_list, desc_node)
|
|
dma_pool_free(pd->pool, desc, desc->txd.phys);
|
|
|
|
pdc_enable_irq(chan, 0);
|
|
}
|
|
|
|
static enum dma_status pd_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
return dma_cookie_status(chan, cookie, txstate);
|
|
}
|
|
|
|
static void pd_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
|
|
|
|
if (pdc_is_idle(pd_chan)) {
|
|
spin_lock(&pd_chan->lock);
|
|
pdc_advance_work(pd_chan);
|
|
spin_unlock(&pd_chan->lock);
|
|
}
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *pd_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 pch_dma_chan *pd_chan = to_pd_chan(chan);
|
|
struct pch_dma_slave *pd_slave = chan->private;
|
|
struct pch_dma_desc *first = NULL;
|
|
struct pch_dma_desc *prev = NULL;
|
|
struct pch_dma_desc *desc = NULL;
|
|
struct scatterlist *sg;
|
|
dma_addr_t reg;
|
|
int i;
|
|
|
|
if (unlikely(!sg_len)) {
|
|
dev_info(chan2dev(chan), "prep_slave_sg: length is zero!\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (direction == DMA_DEV_TO_MEM)
|
|
reg = pd_slave->rx_reg;
|
|
else if (direction == DMA_MEM_TO_DEV)
|
|
reg = pd_slave->tx_reg;
|
|
else
|
|
return NULL;
|
|
|
|
pd_chan->dir = direction;
|
|
pdc_set_dir(chan);
|
|
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
desc = pdc_desc_get(pd_chan);
|
|
|
|
if (!desc)
|
|
goto err_desc_get;
|
|
|
|
desc->regs.dev_addr = reg;
|
|
desc->regs.mem_addr = sg_dma_address(sg);
|
|
desc->regs.size = sg_dma_len(sg);
|
|
desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ;
|
|
|
|
switch (pd_slave->width) {
|
|
case PCH_DMA_WIDTH_1_BYTE:
|
|
if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE)
|
|
goto err_desc_get;
|
|
desc->regs.size |= DMA_DESC_WIDTH_1_BYTE;
|
|
break;
|
|
case PCH_DMA_WIDTH_2_BYTES:
|
|
if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES)
|
|
goto err_desc_get;
|
|
desc->regs.size |= DMA_DESC_WIDTH_2_BYTES;
|
|
break;
|
|
case PCH_DMA_WIDTH_4_BYTES:
|
|
if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES)
|
|
goto err_desc_get;
|
|
desc->regs.size |= DMA_DESC_WIDTH_4_BYTES;
|
|
break;
|
|
default:
|
|
goto err_desc_get;
|
|
}
|
|
|
|
if (!first) {
|
|
first = desc;
|
|
} else {
|
|
prev->regs.next |= desc->txd.phys;
|
|
list_add_tail(&desc->desc_node, &first->tx_list);
|
|
}
|
|
|
|
prev = desc;
|
|
}
|
|
|
|
if (flags & DMA_PREP_INTERRUPT)
|
|
desc->regs.next = DMA_DESC_END_WITH_IRQ;
|
|
else
|
|
desc->regs.next = DMA_DESC_END_WITHOUT_IRQ;
|
|
|
|
first->txd.cookie = -EBUSY;
|
|
desc->txd.flags = flags;
|
|
|
|
return &first->txd;
|
|
|
|
err_desc_get:
|
|
dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n");
|
|
pdc_desc_put(pd_chan, first);
|
|
return NULL;
|
|
}
|
|
|
|
static int pd_device_terminate_all(struct dma_chan *chan)
|
|
{
|
|
struct pch_dma_chan *pd_chan = to_pd_chan(chan);
|
|
struct pch_dma_desc *desc, *_d;
|
|
LIST_HEAD(list);
|
|
|
|
spin_lock_irq(&pd_chan->lock);
|
|
|
|
pdc_set_mode(&pd_chan->chan, DMA_CTL0_DISABLE);
|
|
|
|
list_splice_init(&pd_chan->active_list, &list);
|
|
list_splice_init(&pd_chan->queue, &list);
|
|
|
|
list_for_each_entry_safe(desc, _d, &list, desc_node)
|
|
pdc_chain_complete(pd_chan, desc);
|
|
|
|
spin_unlock_irq(&pd_chan->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pdc_tasklet(struct tasklet_struct *t)
|
|
{
|
|
struct pch_dma_chan *pd_chan = from_tasklet(pd_chan, t, tasklet);
|
|
unsigned long flags;
|
|
|
|
if (!pdc_is_idle(pd_chan)) {
|
|
dev_err(chan2dev(&pd_chan->chan),
|
|
"BUG: handle non-idle channel in tasklet\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&pd_chan->lock, flags);
|
|
if (test_and_clear_bit(0, &pd_chan->err_status))
|
|
pdc_handle_error(pd_chan);
|
|
else
|
|
pdc_advance_work(pd_chan);
|
|
spin_unlock_irqrestore(&pd_chan->lock, flags);
|
|
}
|
|
|
|
static irqreturn_t pd_irq(int irq, void *devid)
|
|
{
|
|
struct pch_dma *pd = (struct pch_dma *)devid;
|
|
struct pch_dma_chan *pd_chan;
|
|
u32 sts0;
|
|
u32 sts2;
|
|
int i;
|
|
int ret0 = IRQ_NONE;
|
|
int ret2 = IRQ_NONE;
|
|
|
|
sts0 = dma_readl(pd, STS0);
|
|
sts2 = dma_readl(pd, STS2);
|
|
|
|
dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0);
|
|
|
|
for (i = 0; i < pd->dma.chancnt; i++) {
|
|
pd_chan = &pd->channels[i];
|
|
|
|
if (i < 8) {
|
|
if (sts0 & DMA_STATUS_IRQ(i)) {
|
|
if (sts0 & DMA_STATUS0_ERR(i))
|
|
set_bit(0, &pd_chan->err_status);
|
|
|
|
tasklet_schedule(&pd_chan->tasklet);
|
|
ret0 = IRQ_HANDLED;
|
|
}
|
|
} else {
|
|
if (sts2 & DMA_STATUS_IRQ(i - 8)) {
|
|
if (sts2 & DMA_STATUS2_ERR(i))
|
|
set_bit(0, &pd_chan->err_status);
|
|
|
|
tasklet_schedule(&pd_chan->tasklet);
|
|
ret2 = IRQ_HANDLED;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* clear interrupt bits in status register */
|
|
if (ret0)
|
|
dma_writel(pd, STS0, sts0);
|
|
if (ret2)
|
|
dma_writel(pd, STS2, sts2);
|
|
|
|
return ret0 | ret2;
|
|
}
|
|
|
|
static void __maybe_unused pch_dma_save_regs(struct pch_dma *pd)
|
|
{
|
|
struct pch_dma_chan *pd_chan;
|
|
struct dma_chan *chan, *_c;
|
|
int i = 0;
|
|
|
|
pd->regs.dma_ctl0 = dma_readl(pd, CTL0);
|
|
pd->regs.dma_ctl1 = dma_readl(pd, CTL1);
|
|
pd->regs.dma_ctl2 = dma_readl(pd, CTL2);
|
|
pd->regs.dma_ctl3 = dma_readl(pd, CTL3);
|
|
|
|
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
|
|
pd_chan = to_pd_chan(chan);
|
|
|
|
pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
|
|
pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
|
|
pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
|
|
pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);
|
|
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static void __maybe_unused pch_dma_restore_regs(struct pch_dma *pd)
|
|
{
|
|
struct pch_dma_chan *pd_chan;
|
|
struct dma_chan *chan, *_c;
|
|
int i = 0;
|
|
|
|
dma_writel(pd, CTL0, pd->regs.dma_ctl0);
|
|
dma_writel(pd, CTL1, pd->regs.dma_ctl1);
|
|
dma_writel(pd, CTL2, pd->regs.dma_ctl2);
|
|
dma_writel(pd, CTL3, pd->regs.dma_ctl3);
|
|
|
|
list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
|
|
pd_chan = to_pd_chan(chan);
|
|
|
|
channel_writel(pd_chan, DEV_ADDR, pd->ch_regs[i].dev_addr);
|
|
channel_writel(pd_chan, MEM_ADDR, pd->ch_regs[i].mem_addr);
|
|
channel_writel(pd_chan, SIZE, pd->ch_regs[i].size);
|
|
channel_writel(pd_chan, NEXT, pd->ch_regs[i].next);
|
|
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static int __maybe_unused pch_dma_suspend(struct device *dev)
|
|
{
|
|
struct pch_dma *pd = dev_get_drvdata(dev);
|
|
|
|
if (pd)
|
|
pch_dma_save_regs(pd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused pch_dma_resume(struct device *dev)
|
|
{
|
|
struct pch_dma *pd = dev_get_drvdata(dev);
|
|
|
|
if (pd)
|
|
pch_dma_restore_regs(pd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_dma_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
struct pch_dma *pd;
|
|
struct pch_dma_regs *regs;
|
|
unsigned int nr_channels;
|
|
int err;
|
|
int i;
|
|
|
|
nr_channels = id->driver_data;
|
|
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
|
|
if (!pd)
|
|
return -ENOMEM;
|
|
|
|
pci_set_drvdata(pdev, pd);
|
|
|
|
err = pci_enable_device(pdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Cannot enable PCI device\n");
|
|
goto err_free_mem;
|
|
}
|
|
|
|
if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
|
|
dev_err(&pdev->dev, "Cannot find proper base address\n");
|
|
err = -ENODEV;
|
|
goto err_disable_pdev;
|
|
}
|
|
|
|
err = pci_request_regions(pdev, DRV_NAME);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Cannot obtain PCI resources\n");
|
|
goto err_disable_pdev;
|
|
}
|
|
|
|
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Cannot set proper DMA config\n");
|
|
goto err_free_res;
|
|
}
|
|
|
|
regs = pd->membase = pci_iomap(pdev, 1, 0);
|
|
if (!pd->membase) {
|
|
dev_err(&pdev->dev, "Cannot map MMIO registers\n");
|
|
err = -ENOMEM;
|
|
goto err_free_res;
|
|
}
|
|
|
|
pci_set_master(pdev);
|
|
pd->dma.dev = &pdev->dev;
|
|
|
|
err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to request IRQ\n");
|
|
goto err_iounmap;
|
|
}
|
|
|
|
pd->pool = dma_pool_create("pch_dma_desc_pool", &pdev->dev,
|
|
sizeof(struct pch_dma_desc), 4, 0);
|
|
if (!pd->pool) {
|
|
dev_err(&pdev->dev, "Failed to alloc DMA descriptors\n");
|
|
err = -ENOMEM;
|
|
goto err_free_irq;
|
|
}
|
|
|
|
|
|
INIT_LIST_HEAD(&pd->dma.channels);
|
|
|
|
for (i = 0; i < nr_channels; i++) {
|
|
struct pch_dma_chan *pd_chan = &pd->channels[i];
|
|
|
|
pd_chan->chan.device = &pd->dma;
|
|
dma_cookie_init(&pd_chan->chan);
|
|
|
|
pd_chan->membase = ®s->desc[i];
|
|
|
|
spin_lock_init(&pd_chan->lock);
|
|
|
|
INIT_LIST_HEAD(&pd_chan->active_list);
|
|
INIT_LIST_HEAD(&pd_chan->queue);
|
|
INIT_LIST_HEAD(&pd_chan->free_list);
|
|
|
|
tasklet_setup(&pd_chan->tasklet, pdc_tasklet);
|
|
list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels);
|
|
}
|
|
|
|
dma_cap_zero(pd->dma.cap_mask);
|
|
dma_cap_set(DMA_PRIVATE, pd->dma.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, pd->dma.cap_mask);
|
|
|
|
pd->dma.device_alloc_chan_resources = pd_alloc_chan_resources;
|
|
pd->dma.device_free_chan_resources = pd_free_chan_resources;
|
|
pd->dma.device_tx_status = pd_tx_status;
|
|
pd->dma.device_issue_pending = pd_issue_pending;
|
|
pd->dma.device_prep_slave_sg = pd_prep_slave_sg;
|
|
pd->dma.device_terminate_all = pd_device_terminate_all;
|
|
|
|
err = dma_async_device_register(&pd->dma);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to register DMA device\n");
|
|
goto err_free_pool;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_pool:
|
|
dma_pool_destroy(pd->pool);
|
|
err_free_irq:
|
|
free_irq(pdev->irq, pd);
|
|
err_iounmap:
|
|
pci_iounmap(pdev, pd->membase);
|
|
err_free_res:
|
|
pci_release_regions(pdev);
|
|
err_disable_pdev:
|
|
pci_disable_device(pdev);
|
|
err_free_mem:
|
|
kfree(pd);
|
|
return err;
|
|
}
|
|
|
|
static void pch_dma_remove(struct pci_dev *pdev)
|
|
{
|
|
struct pch_dma *pd = pci_get_drvdata(pdev);
|
|
struct pch_dma_chan *pd_chan;
|
|
struct dma_chan *chan, *_c;
|
|
|
|
if (pd) {
|
|
dma_async_device_unregister(&pd->dma);
|
|
|
|
free_irq(pdev->irq, pd);
|
|
|
|
list_for_each_entry_safe(chan, _c, &pd->dma.channels,
|
|
device_node) {
|
|
pd_chan = to_pd_chan(chan);
|
|
|
|
tasklet_kill(&pd_chan->tasklet);
|
|
}
|
|
|
|
dma_pool_destroy(pd->pool);
|
|
pci_iounmap(pdev, pd->membase);
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
kfree(pd);
|
|
}
|
|
}
|
|
|
|
/* PCI Device ID of DMA device */
|
|
#define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH 0x8810
|
|
#define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH 0x8815
|
|
#define PCI_DEVICE_ID_ML7213_DMA1_8CH 0x8026
|
|
#define PCI_DEVICE_ID_ML7213_DMA2_8CH 0x802B
|
|
#define PCI_DEVICE_ID_ML7213_DMA3_4CH 0x8034
|
|
#define PCI_DEVICE_ID_ML7213_DMA4_12CH 0x8032
|
|
#define PCI_DEVICE_ID_ML7223_DMA1_4CH 0x800B
|
|
#define PCI_DEVICE_ID_ML7223_DMA2_4CH 0x800E
|
|
#define PCI_DEVICE_ID_ML7223_DMA3_4CH 0x8017
|
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#define PCI_DEVICE_ID_ML7223_DMA4_4CH 0x803B
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#define PCI_DEVICE_ID_ML7831_DMA1_8CH 0x8810
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#define PCI_DEVICE_ID_ML7831_DMA2_4CH 0x8815
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static const struct pci_device_id pch_dma_id_table[] = {
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{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 },
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{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 },
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), 8}, /* PCMIF SPI */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), 4}, /* FPGA */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA4_12CH), 12}, /* I2S */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA1_4CH), 4}, /* UART */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA2_4CH), 4}, /* Video SPI */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA3_4CH), 4}, /* Security */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA4_4CH), 4}, /* FPGA */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA1_8CH), 8}, /* UART */
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{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA2_4CH), 4}, /* SPI */
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{ 0, },
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};
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static SIMPLE_DEV_PM_OPS(pch_dma_pm_ops, pch_dma_suspend, pch_dma_resume);
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static struct pci_driver pch_dma_driver = {
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.name = DRV_NAME,
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.id_table = pch_dma_id_table,
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.probe = pch_dma_probe,
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.remove = pch_dma_remove,
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.driver.pm = &pch_dma_pm_ops,
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};
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module_pci_driver(pch_dma_driver);
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MODULE_DESCRIPTION("Intel EG20T PCH / LAPIS Semicon ML7213/ML7223/ML7831 IOH "
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"DMA controller driver");
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MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DEVICE_TABLE(pci, pch_dma_id_table);
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