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![Dan Carpenter](/assets/img/avatar_default.png)
"param" can be NULL here, so only dereference it after the check. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1215 lines
32 KiB
C
1215 lines
32 KiB
C
/*
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* Renesas SuperH DMA Engine support
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*
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* base is drivers/dma/flsdma.c
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*
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* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
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* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
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* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* - DMA of SuperH does not have Hardware DMA chain mode.
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* - MAX DMA size is 16MB.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/dmaengine.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/sh_dma.h>
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#include "shdma.h"
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/* DMA descriptor control */
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enum sh_dmae_desc_status {
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DESC_IDLE,
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DESC_PREPARED,
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DESC_SUBMITTED,
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DESC_COMPLETED, /* completed, have to call callback */
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DESC_WAITING, /* callback called, waiting for ack / re-submit */
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};
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#define NR_DESCS_PER_CHANNEL 32
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/* Default MEMCPY transfer size = 2^2 = 4 bytes */
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#define LOG2_DEFAULT_XFER_SIZE 2
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/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
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static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
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static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
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static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
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{
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__raw_writel(data, sh_dc->base + reg / sizeof(u32));
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}
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static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
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{
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return __raw_readl(sh_dc->base + reg / sizeof(u32));
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}
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static u16 dmaor_read(struct sh_dmae_device *shdev)
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{
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return __raw_readw(shdev->chan_reg + DMAOR / sizeof(u32));
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}
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static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
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{
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__raw_writew(data, shdev->chan_reg + DMAOR / sizeof(u32));
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}
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/*
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* Reset DMA controller
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*
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* SH7780 has two DMAOR register
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*/
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static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
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{
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unsigned short dmaor = dmaor_read(shdev);
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dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
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}
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static int sh_dmae_rst(struct sh_dmae_device *shdev)
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{
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unsigned short dmaor;
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sh_dmae_ctl_stop(shdev);
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dmaor = dmaor_read(shdev) | shdev->pdata->dmaor_init;
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dmaor_write(shdev, dmaor);
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if (dmaor_read(shdev) & (DMAOR_AE | DMAOR_NMIF)) {
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pr_warning("dma-sh: Can't initialize DMAOR.\n");
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return -EINVAL;
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}
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return 0;
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}
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static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
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{
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u32 chcr = sh_dmae_readl(sh_chan, CHCR);
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if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
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return true; /* working */
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return false; /* waiting */
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}
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static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
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{
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struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
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struct sh_dmae_device, common);
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struct sh_dmae_pdata *pdata = shdev->pdata;
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int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
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((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
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if (cnt >= pdata->ts_shift_num)
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cnt = 0;
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return pdata->ts_shift[cnt];
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}
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static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
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{
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struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
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struct sh_dmae_device, common);
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struct sh_dmae_pdata *pdata = shdev->pdata;
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int i;
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for (i = 0; i < pdata->ts_shift_num; i++)
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if (pdata->ts_shift[i] == l2size)
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break;
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if (i == pdata->ts_shift_num)
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i = 0;
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return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
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((i << pdata->ts_high_shift) & pdata->ts_high_mask);
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}
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static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
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{
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sh_dmae_writel(sh_chan, hw->sar, SAR);
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sh_dmae_writel(sh_chan, hw->dar, DAR);
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sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
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}
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static void dmae_start(struct sh_dmae_chan *sh_chan)
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{
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u32 chcr = sh_dmae_readl(sh_chan, CHCR);
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chcr |= CHCR_DE | CHCR_IE;
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sh_dmae_writel(sh_chan, chcr & ~CHCR_TE, CHCR);
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}
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static void dmae_halt(struct sh_dmae_chan *sh_chan)
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{
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u32 chcr = sh_dmae_readl(sh_chan, CHCR);
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chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
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sh_dmae_writel(sh_chan, chcr, CHCR);
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}
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static void dmae_init(struct sh_dmae_chan *sh_chan)
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{
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/*
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* Default configuration for dual address memory-memory transfer.
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* 0x400 represents auto-request.
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*/
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u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
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LOG2_DEFAULT_XFER_SIZE);
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sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
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sh_dmae_writel(sh_chan, chcr, CHCR);
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}
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static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
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{
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/* When DMA was working, can not set data to CHCR */
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if (dmae_is_busy(sh_chan))
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return -EBUSY;
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sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
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sh_dmae_writel(sh_chan, val, CHCR);
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return 0;
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}
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static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
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{
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struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
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struct sh_dmae_device, common);
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struct sh_dmae_pdata *pdata = shdev->pdata;
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const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
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u16 __iomem *addr = shdev->dmars + chan_pdata->dmars / sizeof(u16);
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int shift = chan_pdata->dmars_bit;
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if (dmae_is_busy(sh_chan))
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return -EBUSY;
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__raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
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addr);
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return 0;
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}
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static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
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{
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struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
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struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
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dma_async_tx_callback callback = tx->callback;
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dma_cookie_t cookie;
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spin_lock_bh(&sh_chan->desc_lock);
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cookie = sh_chan->common.cookie;
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cookie++;
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if (cookie < 0)
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cookie = 1;
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sh_chan->common.cookie = cookie;
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tx->cookie = cookie;
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/* Mark all chunks of this descriptor as submitted, move to the queue */
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list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
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/*
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* All chunks are on the global ld_free, so, we have to find
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* the end of the chain ourselves
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*/
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if (chunk != desc && (chunk->mark == DESC_IDLE ||
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chunk->async_tx.cookie > 0 ||
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chunk->async_tx.cookie == -EBUSY ||
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&chunk->node == &sh_chan->ld_free))
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break;
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chunk->mark = DESC_SUBMITTED;
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/* Callback goes to the last chunk */
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chunk->async_tx.callback = NULL;
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chunk->cookie = cookie;
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list_move_tail(&chunk->node, &sh_chan->ld_queue);
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last = chunk;
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}
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last->async_tx.callback = callback;
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last->async_tx.callback_param = tx->callback_param;
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dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
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tx->cookie, &last->async_tx, sh_chan->id,
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desc->hw.sar, desc->hw.tcr, desc->hw.dar);
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spin_unlock_bh(&sh_chan->desc_lock);
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return cookie;
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}
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/* Called with desc_lock held */
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static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
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{
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struct sh_desc *desc;
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list_for_each_entry(desc, &sh_chan->ld_free, node)
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if (desc->mark != DESC_PREPARED) {
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BUG_ON(desc->mark != DESC_IDLE);
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list_del(&desc->node);
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return desc;
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}
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return NULL;
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}
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static const struct sh_dmae_slave_config *sh_dmae_find_slave(
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struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
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{
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struct dma_device *dma_dev = sh_chan->common.device;
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struct sh_dmae_device *shdev = container_of(dma_dev,
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struct sh_dmae_device, common);
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struct sh_dmae_pdata *pdata = shdev->pdata;
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int i;
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if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
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return NULL;
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for (i = 0; i < pdata->slave_num; i++)
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if (pdata->slave[i].slave_id == param->slave_id)
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return pdata->slave + i;
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return NULL;
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}
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static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
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{
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struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
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struct sh_desc *desc;
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struct sh_dmae_slave *param = chan->private;
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int ret;
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pm_runtime_get_sync(sh_chan->dev);
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/*
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* This relies on the guarantee from dmaengine that alloc_chan_resources
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* never runs concurrently with itself or free_chan_resources.
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*/
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if (param) {
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const struct sh_dmae_slave_config *cfg;
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cfg = sh_dmae_find_slave(sh_chan, param);
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if (!cfg) {
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ret = -EINVAL;
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goto efindslave;
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}
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if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
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ret = -EBUSY;
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goto etestused;
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}
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param->config = cfg;
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dmae_set_dmars(sh_chan, cfg->mid_rid);
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dmae_set_chcr(sh_chan, cfg->chcr);
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} else if ((sh_dmae_readl(sh_chan, CHCR) & 0xf00) != 0x400) {
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dmae_init(sh_chan);
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}
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spin_lock_bh(&sh_chan->desc_lock);
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while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
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spin_unlock_bh(&sh_chan->desc_lock);
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desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
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if (!desc) {
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spin_lock_bh(&sh_chan->desc_lock);
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break;
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}
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dma_async_tx_descriptor_init(&desc->async_tx,
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&sh_chan->common);
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desc->async_tx.tx_submit = sh_dmae_tx_submit;
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desc->mark = DESC_IDLE;
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spin_lock_bh(&sh_chan->desc_lock);
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list_add(&desc->node, &sh_chan->ld_free);
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sh_chan->descs_allocated++;
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}
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spin_unlock_bh(&sh_chan->desc_lock);
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if (!sh_chan->descs_allocated) {
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ret = -ENOMEM;
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goto edescalloc;
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}
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return sh_chan->descs_allocated;
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edescalloc:
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if (param)
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clear_bit(param->slave_id, sh_dmae_slave_used);
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etestused:
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efindslave:
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pm_runtime_put(sh_chan->dev);
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return ret;
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}
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/*
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* sh_dma_free_chan_resources - Free all resources of the channel.
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*/
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static void sh_dmae_free_chan_resources(struct dma_chan *chan)
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{
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struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
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struct sh_desc *desc, *_desc;
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LIST_HEAD(list);
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int descs = sh_chan->descs_allocated;
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dmae_halt(sh_chan);
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/* Prepared and not submitted descriptors can still be on the queue */
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if (!list_empty(&sh_chan->ld_queue))
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sh_dmae_chan_ld_cleanup(sh_chan, true);
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if (chan->private) {
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/* The caller is holding dma_list_mutex */
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struct sh_dmae_slave *param = chan->private;
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clear_bit(param->slave_id, sh_dmae_slave_used);
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}
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spin_lock_bh(&sh_chan->desc_lock);
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list_splice_init(&sh_chan->ld_free, &list);
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sh_chan->descs_allocated = 0;
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spin_unlock_bh(&sh_chan->desc_lock);
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if (descs > 0)
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pm_runtime_put(sh_chan->dev);
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list_for_each_entry_safe(desc, _desc, &list, node)
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kfree(desc);
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}
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/**
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* sh_dmae_add_desc - get, set up and return one transfer descriptor
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* @sh_chan: DMA channel
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* @flags: DMA transfer flags
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* @dest: destination DMA address, incremented when direction equals
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* DMA_FROM_DEVICE or DMA_BIDIRECTIONAL
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* @src: source DMA address, incremented when direction equals
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* DMA_TO_DEVICE or DMA_BIDIRECTIONAL
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* @len: DMA transfer length
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* @first: if NULL, set to the current descriptor and cookie set to -EBUSY
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* @direction: needed for slave DMA to decide which address to keep constant,
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* equals DMA_BIDIRECTIONAL for MEMCPY
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* Returns 0 or an error
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* Locks: called with desc_lock held
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*/
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static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
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unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
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struct sh_desc **first, enum dma_data_direction direction)
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{
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struct sh_desc *new;
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size_t copy_size;
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if (!*len)
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return NULL;
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|
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/* Allocate the link descriptor from the free list */
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new = sh_dmae_get_desc(sh_chan);
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if (!new) {
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dev_err(sh_chan->dev, "No free link descriptor available\n");
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return NULL;
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}
|
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|
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copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
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|
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new->hw.sar = *src;
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new->hw.dar = *dest;
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new->hw.tcr = copy_size;
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|
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if (!*first) {
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/* First desc */
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new->async_tx.cookie = -EBUSY;
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*first = new;
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} else {
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/* Other desc - invisible to the user */
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new->async_tx.cookie = -EINVAL;
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}
|
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|
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dev_dbg(sh_chan->dev,
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"chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
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copy_size, *len, *src, *dest, &new->async_tx,
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new->async_tx.cookie, sh_chan->xmit_shift);
|
|
|
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new->mark = DESC_PREPARED;
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new->async_tx.flags = flags;
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new->direction = direction;
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|
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*len -= copy_size;
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if (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE)
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*src += copy_size;
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if (direction == DMA_BIDIRECTIONAL || direction == DMA_FROM_DEVICE)
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*dest += copy_size;
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|
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return new;
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}
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|
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/*
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* sh_dmae_prep_sg - prepare transfer descriptors from an SG list
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*
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* Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
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* converted to scatter-gather to guarantee consistent locking and a correct
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* list manipulation. For slave DMA direction carries the usual meaning, and,
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* logically, the SG list is RAM and the addr variable contains slave address,
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* e.g., the FIFO I/O register. For MEMCPY direction equals DMA_BIDIRECTIONAL
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* and the SG list contains only one element and points at the source buffer.
|
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*/
|
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static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
|
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struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
|
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enum dma_data_direction direction, unsigned long flags)
|
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{
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struct scatterlist *sg;
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struct sh_desc *first = NULL, *new = NULL /* compiler... */;
|
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LIST_HEAD(tx_list);
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int chunks = 0;
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int i;
|
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|
|
if (!sg_len)
|
|
return NULL;
|
|
|
|
for_each_sg(sgl, sg, sg_len, i)
|
|
chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
|
|
(SH_DMA_TCR_MAX + 1);
|
|
|
|
/* Have to lock the whole loop to protect against concurrent release */
|
|
spin_lock_bh(&sh_chan->desc_lock);
|
|
|
|
/*
|
|
* Chaining:
|
|
* first descriptor is what user is dealing with in all API calls, its
|
|
* cookie is at first set to -EBUSY, at tx-submit to a positive
|
|
* number
|
|
* if more than one chunk is needed further chunks have cookie = -EINVAL
|
|
* the last chunk, if not equal to the first, has cookie = -ENOSPC
|
|
* all chunks are linked onto the tx_list head with their .node heads
|
|
* only during this function, then they are immediately spliced
|
|
* back onto the free list in form of a chain
|
|
*/
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
dma_addr_t sg_addr = sg_dma_address(sg);
|
|
size_t len = sg_dma_len(sg);
|
|
|
|
if (!len)
|
|
goto err_get_desc;
|
|
|
|
do {
|
|
dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
|
|
i, sg, len, (unsigned long long)sg_addr);
|
|
|
|
if (direction == DMA_FROM_DEVICE)
|
|
new = sh_dmae_add_desc(sh_chan, flags,
|
|
&sg_addr, addr, &len, &first,
|
|
direction);
|
|
else
|
|
new = sh_dmae_add_desc(sh_chan, flags,
|
|
addr, &sg_addr, &len, &first,
|
|
direction);
|
|
if (!new)
|
|
goto err_get_desc;
|
|
|
|
new->chunks = chunks--;
|
|
list_add_tail(&new->node, &tx_list);
|
|
} while (len);
|
|
}
|
|
|
|
if (new != first)
|
|
new->async_tx.cookie = -ENOSPC;
|
|
|
|
/* Put them back on the free list, so, they don't get lost */
|
|
list_splice_tail(&tx_list, &sh_chan->ld_free);
|
|
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
|
|
return &first->async_tx;
|
|
|
|
err_get_desc:
|
|
list_for_each_entry(new, &tx_list, node)
|
|
new->mark = DESC_IDLE;
|
|
list_splice(&tx_list, &sh_chan->ld_free);
|
|
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
|
|
struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
|
|
size_t len, unsigned long flags)
|
|
{
|
|
struct sh_dmae_chan *sh_chan;
|
|
struct scatterlist sg;
|
|
|
|
if (!chan || !len)
|
|
return NULL;
|
|
|
|
chan->private = NULL;
|
|
|
|
sh_chan = to_sh_chan(chan);
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
|
|
offset_in_page(dma_src));
|
|
sg_dma_address(&sg) = dma_src;
|
|
sg_dma_len(&sg) = len;
|
|
|
|
return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_BIDIRECTIONAL,
|
|
flags);
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
|
|
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
|
|
enum dma_data_direction direction, unsigned long flags)
|
|
{
|
|
struct sh_dmae_slave *param;
|
|
struct sh_dmae_chan *sh_chan;
|
|
dma_addr_t slave_addr;
|
|
|
|
if (!chan)
|
|
return NULL;
|
|
|
|
sh_chan = to_sh_chan(chan);
|
|
param = chan->private;
|
|
|
|
/* Someone calling slave DMA on a public channel? */
|
|
if (!param || !sg_len) {
|
|
dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
|
|
__func__, param, sg_len, param ? param->slave_id : -1);
|
|
return NULL;
|
|
}
|
|
|
|
slave_addr = param->config->addr;
|
|
|
|
/*
|
|
* if (param != NULL), this is a successfully requested slave channel,
|
|
* therefore param->config != NULL too.
|
|
*/
|
|
return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
|
|
direction, flags);
|
|
}
|
|
|
|
static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
|
|
/* Only supports DMA_TERMINATE_ALL */
|
|
if (cmd != DMA_TERMINATE_ALL)
|
|
return -ENXIO;
|
|
|
|
if (!chan)
|
|
return -EINVAL;
|
|
|
|
dmae_halt(sh_chan);
|
|
|
|
spin_lock_bh(&sh_chan->desc_lock);
|
|
if (!list_empty(&sh_chan->ld_queue)) {
|
|
/* Record partial transfer */
|
|
struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
|
|
struct sh_desc, node);
|
|
desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
|
|
sh_chan->xmit_shift;
|
|
|
|
}
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
|
|
sh_dmae_chan_ld_cleanup(sh_chan, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
|
|
{
|
|
struct sh_desc *desc, *_desc;
|
|
/* Is the "exposed" head of a chain acked? */
|
|
bool head_acked = false;
|
|
dma_cookie_t cookie = 0;
|
|
dma_async_tx_callback callback = NULL;
|
|
void *param = NULL;
|
|
|
|
spin_lock_bh(&sh_chan->desc_lock);
|
|
list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
|
|
struct dma_async_tx_descriptor *tx = &desc->async_tx;
|
|
|
|
BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
|
|
BUG_ON(desc->mark != DESC_SUBMITTED &&
|
|
desc->mark != DESC_COMPLETED &&
|
|
desc->mark != DESC_WAITING);
|
|
|
|
/*
|
|
* queue is ordered, and we use this loop to (1) clean up all
|
|
* completed descriptors, and to (2) update descriptor flags of
|
|
* any chunks in a (partially) completed chain
|
|
*/
|
|
if (!all && desc->mark == DESC_SUBMITTED &&
|
|
desc->cookie != cookie)
|
|
break;
|
|
|
|
if (tx->cookie > 0)
|
|
cookie = tx->cookie;
|
|
|
|
if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
|
|
if (sh_chan->completed_cookie != desc->cookie - 1)
|
|
dev_dbg(sh_chan->dev,
|
|
"Completing cookie %d, expected %d\n",
|
|
desc->cookie,
|
|
sh_chan->completed_cookie + 1);
|
|
sh_chan->completed_cookie = desc->cookie;
|
|
}
|
|
|
|
/* Call callback on the last chunk */
|
|
if (desc->mark == DESC_COMPLETED && tx->callback) {
|
|
desc->mark = DESC_WAITING;
|
|
callback = tx->callback;
|
|
param = tx->callback_param;
|
|
dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
|
|
tx->cookie, tx, sh_chan->id);
|
|
BUG_ON(desc->chunks != 1);
|
|
break;
|
|
}
|
|
|
|
if (tx->cookie > 0 || tx->cookie == -EBUSY) {
|
|
if (desc->mark == DESC_COMPLETED) {
|
|
BUG_ON(tx->cookie < 0);
|
|
desc->mark = DESC_WAITING;
|
|
}
|
|
head_acked = async_tx_test_ack(tx);
|
|
} else {
|
|
switch (desc->mark) {
|
|
case DESC_COMPLETED:
|
|
desc->mark = DESC_WAITING;
|
|
/* Fall through */
|
|
case DESC_WAITING:
|
|
if (head_acked)
|
|
async_tx_ack(&desc->async_tx);
|
|
}
|
|
}
|
|
|
|
dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
|
|
tx, tx->cookie);
|
|
|
|
if (((desc->mark == DESC_COMPLETED ||
|
|
desc->mark == DESC_WAITING) &&
|
|
async_tx_test_ack(&desc->async_tx)) || all) {
|
|
/* Remove from ld_queue list */
|
|
desc->mark = DESC_IDLE;
|
|
list_move(&desc->node, &sh_chan->ld_free);
|
|
}
|
|
}
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
|
|
if (callback)
|
|
callback(param);
|
|
|
|
return callback;
|
|
}
|
|
|
|
/*
|
|
* sh_chan_ld_cleanup - Clean up link descriptors
|
|
*
|
|
* This function cleans up the ld_queue of DMA channel.
|
|
*/
|
|
static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
|
|
{
|
|
while (__ld_cleanup(sh_chan, all))
|
|
;
|
|
|
|
if (all)
|
|
/* Terminating - forgive uncompleted cookies */
|
|
sh_chan->completed_cookie = sh_chan->common.cookie;
|
|
}
|
|
|
|
static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
|
|
{
|
|
struct sh_desc *desc;
|
|
|
|
spin_lock_bh(&sh_chan->desc_lock);
|
|
/* DMA work check */
|
|
if (dmae_is_busy(sh_chan)) {
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
return;
|
|
}
|
|
|
|
/* Find the first not transferred desciptor */
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node)
|
|
if (desc->mark == DESC_SUBMITTED) {
|
|
dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
|
|
desc->async_tx.cookie, sh_chan->id,
|
|
desc->hw.tcr, desc->hw.sar, desc->hw.dar);
|
|
/* Get the ld start address from ld_queue */
|
|
dmae_set_reg(sh_chan, &desc->hw);
|
|
dmae_start(sh_chan);
|
|
break;
|
|
}
|
|
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
}
|
|
|
|
static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
sh_chan_xfer_ld_queue(sh_chan);
|
|
}
|
|
|
|
static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
|
|
dma_cookie_t last_used;
|
|
dma_cookie_t last_complete;
|
|
enum dma_status status;
|
|
|
|
sh_dmae_chan_ld_cleanup(sh_chan, false);
|
|
|
|
last_used = chan->cookie;
|
|
last_complete = sh_chan->completed_cookie;
|
|
BUG_ON(last_complete < 0);
|
|
dma_set_tx_state(txstate, last_complete, last_used, 0);
|
|
|
|
spin_lock_bh(&sh_chan->desc_lock);
|
|
|
|
status = dma_async_is_complete(cookie, last_complete, last_used);
|
|
|
|
/*
|
|
* If we don't find cookie on the queue, it has been aborted and we have
|
|
* to report error
|
|
*/
|
|
if (status != DMA_SUCCESS) {
|
|
struct sh_desc *desc;
|
|
status = DMA_ERROR;
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node)
|
|
if (desc->cookie == cookie) {
|
|
status = DMA_IN_PROGRESS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&sh_chan->desc_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
static irqreturn_t sh_dmae_interrupt(int irq, void *data)
|
|
{
|
|
irqreturn_t ret = IRQ_NONE;
|
|
struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
|
|
u32 chcr = sh_dmae_readl(sh_chan, CHCR);
|
|
|
|
if (chcr & CHCR_TE) {
|
|
/* DMA stop */
|
|
dmae_halt(sh_chan);
|
|
|
|
ret = IRQ_HANDLED;
|
|
tasklet_schedule(&sh_chan->tasklet);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
|
|
static irqreturn_t sh_dmae_err(int irq, void *data)
|
|
{
|
|
struct sh_dmae_device *shdev = (struct sh_dmae_device *)data;
|
|
int i;
|
|
|
|
/* halt the dma controller */
|
|
sh_dmae_ctl_stop(shdev);
|
|
|
|
/* We cannot detect, which channel caused the error, have to reset all */
|
|
for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
if (sh_chan) {
|
|
struct sh_desc *desc;
|
|
/* Stop the channel */
|
|
dmae_halt(sh_chan);
|
|
/* Complete all */
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node) {
|
|
struct dma_async_tx_descriptor *tx = &desc->async_tx;
|
|
desc->mark = DESC_IDLE;
|
|
if (tx->callback)
|
|
tx->callback(tx->callback_param);
|
|
}
|
|
list_splice_init(&sh_chan->ld_queue, &sh_chan->ld_free);
|
|
}
|
|
}
|
|
sh_dmae_rst(shdev);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
#endif
|
|
|
|
static void dmae_do_tasklet(unsigned long data)
|
|
{
|
|
struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
|
|
struct sh_desc *desc;
|
|
u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
|
|
u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
|
|
|
|
spin_lock(&sh_chan->desc_lock);
|
|
list_for_each_entry(desc, &sh_chan->ld_queue, node) {
|
|
if (desc->mark == DESC_SUBMITTED &&
|
|
((desc->direction == DMA_FROM_DEVICE &&
|
|
(desc->hw.dar + desc->hw.tcr) == dar_buf) ||
|
|
(desc->hw.sar + desc->hw.tcr) == sar_buf)) {
|
|
dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
|
|
desc->async_tx.cookie, &desc->async_tx,
|
|
desc->hw.dar);
|
|
desc->mark = DESC_COMPLETED;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&sh_chan->desc_lock);
|
|
|
|
/* Next desc */
|
|
sh_chan_xfer_ld_queue(sh_chan);
|
|
sh_dmae_chan_ld_cleanup(sh_chan, false);
|
|
}
|
|
|
|
static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
|
|
int irq, unsigned long flags)
|
|
{
|
|
int err;
|
|
const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
|
|
struct platform_device *pdev = to_platform_device(shdev->common.dev);
|
|
struct sh_dmae_chan *new_sh_chan;
|
|
|
|
/* alloc channel */
|
|
new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
|
|
if (!new_sh_chan) {
|
|
dev_err(shdev->common.dev,
|
|
"No free memory for allocating dma channels!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* copy struct dma_device */
|
|
new_sh_chan->common.device = &shdev->common;
|
|
|
|
new_sh_chan->dev = shdev->common.dev;
|
|
new_sh_chan->id = id;
|
|
new_sh_chan->irq = irq;
|
|
new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
|
|
|
|
/* Init DMA tasklet */
|
|
tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
|
|
(unsigned long)new_sh_chan);
|
|
|
|
/* Init the channel */
|
|
dmae_init(new_sh_chan);
|
|
|
|
spin_lock_init(&new_sh_chan->desc_lock);
|
|
|
|
/* Init descripter manage list */
|
|
INIT_LIST_HEAD(&new_sh_chan->ld_queue);
|
|
INIT_LIST_HEAD(&new_sh_chan->ld_free);
|
|
|
|
/* Add the channel to DMA device channel list */
|
|
list_add_tail(&new_sh_chan->common.device_node,
|
|
&shdev->common.channels);
|
|
shdev->common.chancnt++;
|
|
|
|
if (pdev->id >= 0)
|
|
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
|
|
"sh-dmae%d.%d", pdev->id, new_sh_chan->id);
|
|
else
|
|
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
|
|
"sh-dma%d", new_sh_chan->id);
|
|
|
|
/* set up channel irq */
|
|
err = request_irq(irq, &sh_dmae_interrupt, flags,
|
|
new_sh_chan->dev_id, new_sh_chan);
|
|
if (err) {
|
|
dev_err(shdev->common.dev, "DMA channel %d request_irq error "
|
|
"with return %d\n", id, err);
|
|
goto err_no_irq;
|
|
}
|
|
|
|
shdev->chan[id] = new_sh_chan;
|
|
return 0;
|
|
|
|
err_no_irq:
|
|
/* remove from dmaengine device node */
|
|
list_del(&new_sh_chan->common.device_node);
|
|
kfree(new_sh_chan);
|
|
return err;
|
|
}
|
|
|
|
static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
|
|
if (shdev->chan[i]) {
|
|
struct sh_dmae_chan *sh_chan = shdev->chan[i];
|
|
|
|
free_irq(sh_chan->irq, sh_chan);
|
|
|
|
list_del(&sh_chan->common.device_node);
|
|
kfree(sh_chan);
|
|
shdev->chan[i] = NULL;
|
|
}
|
|
}
|
|
shdev->common.chancnt = 0;
|
|
}
|
|
|
|
static int __init sh_dmae_probe(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
|
|
unsigned long irqflags = IRQF_DISABLED,
|
|
chan_flag[SH_DMAC_MAX_CHANNELS] = {};
|
|
int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
|
|
int err, i, irq_cnt = 0, irqres = 0;
|
|
struct sh_dmae_device *shdev;
|
|
struct resource *chan, *dmars, *errirq_res, *chanirq_res;
|
|
|
|
/* get platform data */
|
|
if (!pdata || !pdata->channel_num)
|
|
return -ENODEV;
|
|
|
|
chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
/* DMARS area is optional, if absent, this controller cannot do slave DMA */
|
|
dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
/*
|
|
* IRQ resources:
|
|
* 1. there always must be at least one IRQ IO-resource. On SH4 it is
|
|
* the error IRQ, in which case it is the only IRQ in this resource:
|
|
* start == end. If it is the only IRQ resource, all channels also
|
|
* use the same IRQ.
|
|
* 2. DMA channel IRQ resources can be specified one per resource or in
|
|
* ranges (start != end)
|
|
* 3. iff all events (channels and, optionally, error) on this
|
|
* controller use the same IRQ, only one IRQ resource can be
|
|
* specified, otherwise there must be one IRQ per channel, even if
|
|
* some of them are equal
|
|
* 4. if all IRQs on this controller are equal or if some specific IRQs
|
|
* specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
|
|
* requested with the IRQF_SHARED flag
|
|
*/
|
|
errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!chan || !errirq_res)
|
|
return -ENODEV;
|
|
|
|
if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
|
|
dev_err(&pdev->dev, "DMAC register region already claimed\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
|
|
dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
|
|
err = -EBUSY;
|
|
goto ermrdmars;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
|
|
if (!shdev) {
|
|
dev_err(&pdev->dev, "Not enough memory\n");
|
|
goto ealloc;
|
|
}
|
|
|
|
shdev->chan_reg = ioremap(chan->start, resource_size(chan));
|
|
if (!shdev->chan_reg)
|
|
goto emapchan;
|
|
if (dmars) {
|
|
shdev->dmars = ioremap(dmars->start, resource_size(dmars));
|
|
if (!shdev->dmars)
|
|
goto emapdmars;
|
|
}
|
|
|
|
/* platform data */
|
|
shdev->pdata = pdata;
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
|
|
/* reset dma controller */
|
|
err = sh_dmae_rst(shdev);
|
|
if (err)
|
|
goto rst_err;
|
|
|
|
INIT_LIST_HEAD(&shdev->common.channels);
|
|
|
|
dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
|
|
if (dmars)
|
|
dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
|
|
|
|
shdev->common.device_alloc_chan_resources
|
|
= sh_dmae_alloc_chan_resources;
|
|
shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
|
|
shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
|
|
shdev->common.device_tx_status = sh_dmae_tx_status;
|
|
shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
|
|
|
|
/* Compulsory for DMA_SLAVE fields */
|
|
shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
|
|
shdev->common.device_control = sh_dmae_control;
|
|
|
|
shdev->common.dev = &pdev->dev;
|
|
/* Default transfer size of 32 bytes requires 32-byte alignment */
|
|
shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
|
|
|
|
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
|
|
chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
|
|
|
|
if (!chanirq_res)
|
|
chanirq_res = errirq_res;
|
|
else
|
|
irqres++;
|
|
|
|
if (chanirq_res == errirq_res ||
|
|
(errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
|
|
irqflags = IRQF_SHARED;
|
|
|
|
errirq = errirq_res->start;
|
|
|
|
err = request_irq(errirq, sh_dmae_err, irqflags,
|
|
"DMAC Address Error", shdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev,
|
|
"DMA failed requesting irq #%d, error %d\n",
|
|
errirq, err);
|
|
goto eirq_err;
|
|
}
|
|
|
|
#else
|
|
chanirq_res = errirq_res;
|
|
#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
|
|
|
|
if (chanirq_res->start == chanirq_res->end &&
|
|
!platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
|
|
/* Special case - all multiplexed */
|
|
for (; irq_cnt < pdata->channel_num; irq_cnt++) {
|
|
chan_irq[irq_cnt] = chanirq_res->start;
|
|
chan_flag[irq_cnt] = IRQF_SHARED;
|
|
}
|
|
} else {
|
|
do {
|
|
for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
|
|
if ((errirq_res->flags & IORESOURCE_BITS) ==
|
|
IORESOURCE_IRQ_SHAREABLE)
|
|
chan_flag[irq_cnt] = IRQF_SHARED;
|
|
else
|
|
chan_flag[irq_cnt] = IRQF_DISABLED;
|
|
dev_dbg(&pdev->dev,
|
|
"Found IRQ %d for channel %d\n",
|
|
i, irq_cnt);
|
|
chan_irq[irq_cnt++] = i;
|
|
}
|
|
chanirq_res = platform_get_resource(pdev,
|
|
IORESOURCE_IRQ, ++irqres);
|
|
} while (irq_cnt < pdata->channel_num && chanirq_res);
|
|
}
|
|
|
|
if (irq_cnt < pdata->channel_num)
|
|
goto eirqres;
|
|
|
|
/* Create DMA Channel */
|
|
for (i = 0; i < pdata->channel_num; i++) {
|
|
err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
|
|
if (err)
|
|
goto chan_probe_err;
|
|
}
|
|
|
|
pm_runtime_put(&pdev->dev);
|
|
|
|
platform_set_drvdata(pdev, shdev);
|
|
dma_async_device_register(&shdev->common);
|
|
|
|
return err;
|
|
|
|
chan_probe_err:
|
|
sh_dmae_chan_remove(shdev);
|
|
eirqres:
|
|
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
|
|
free_irq(errirq, shdev);
|
|
eirq_err:
|
|
#endif
|
|
rst_err:
|
|
pm_runtime_put(&pdev->dev);
|
|
if (dmars)
|
|
iounmap(shdev->dmars);
|
|
emapdmars:
|
|
iounmap(shdev->chan_reg);
|
|
emapchan:
|
|
kfree(shdev);
|
|
ealloc:
|
|
if (dmars)
|
|
release_mem_region(dmars->start, resource_size(dmars));
|
|
ermrdmars:
|
|
release_mem_region(chan->start, resource_size(chan));
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __exit sh_dmae_remove(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
|
|
struct resource *res;
|
|
int errirq = platform_get_irq(pdev, 0);
|
|
|
|
dma_async_device_unregister(&shdev->common);
|
|
|
|
if (errirq > 0)
|
|
free_irq(errirq, shdev);
|
|
|
|
/* channel data remove */
|
|
sh_dmae_chan_remove(shdev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
if (shdev->dmars)
|
|
iounmap(shdev->dmars);
|
|
iounmap(shdev->chan_reg);
|
|
|
|
kfree(shdev);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (res)
|
|
release_mem_region(res->start, resource_size(res));
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (res)
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sh_dmae_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
|
|
sh_dmae_ctl_stop(shdev);
|
|
}
|
|
|
|
static struct platform_driver sh_dmae_driver = {
|
|
.remove = __exit_p(sh_dmae_remove),
|
|
.shutdown = sh_dmae_shutdown,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "sh-dma-engine",
|
|
},
|
|
};
|
|
|
|
static int __init sh_dmae_init(void)
|
|
{
|
|
return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
|
|
}
|
|
module_init(sh_dmae_init);
|
|
|
|
static void __exit sh_dmae_exit(void)
|
|
{
|
|
platform_driver_unregister(&sh_dmae_driver);
|
|
}
|
|
module_exit(sh_dmae_exit);
|
|
|
|
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
|
|
MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
|
|
MODULE_LICENSE("GPL");
|