![Wolfram Sang](/assets/img/avatar_default.png)
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
1298 lines
33 KiB
C
1298 lines
33 KiB
C
/*
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* offload engine driver for the Marvell XOR engine
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* Copyright (C) 2007, 2008, Marvell International Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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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/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/memory.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/platform_data/dma-mv_xor.h>
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#include "dmaengine.h"
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#include "mv_xor.h"
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static void mv_xor_issue_pending(struct dma_chan *chan);
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#define to_mv_xor_chan(chan) \
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container_of(chan, struct mv_xor_chan, dmachan)
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#define to_mv_xor_slot(tx) \
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container_of(tx, struct mv_xor_desc_slot, async_tx)
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#define mv_chan_to_devp(chan) \
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((chan)->dmadev.dev)
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static void mv_desc_init(struct mv_xor_desc_slot *desc,
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dma_addr_t addr, u32 byte_count,
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enum dma_ctrl_flags flags)
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{
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struct mv_xor_desc *hw_desc = desc->hw_desc;
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hw_desc->status = XOR_DESC_DMA_OWNED;
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hw_desc->phy_next_desc = 0;
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/* Enable end-of-descriptor interrupts only for DMA_PREP_INTERRUPT */
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hw_desc->desc_command = (flags & DMA_PREP_INTERRUPT) ?
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XOR_DESC_EOD_INT_EN : 0;
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hw_desc->phy_dest_addr = addr;
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hw_desc->byte_count = byte_count;
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}
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static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc,
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u32 next_desc_addr)
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{
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struct mv_xor_desc *hw_desc = desc->hw_desc;
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BUG_ON(hw_desc->phy_next_desc);
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hw_desc->phy_next_desc = next_desc_addr;
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}
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static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc)
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{
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struct mv_xor_desc *hw_desc = desc->hw_desc;
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hw_desc->phy_next_desc = 0;
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}
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static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc,
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int index, dma_addr_t addr)
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{
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struct mv_xor_desc *hw_desc = desc->hw_desc;
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hw_desc->phy_src_addr[mv_phy_src_idx(index)] = addr;
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if (desc->type == DMA_XOR)
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hw_desc->desc_command |= (1 << index);
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}
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static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan)
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{
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return readl_relaxed(XOR_CURR_DESC(chan));
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}
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static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan,
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u32 next_desc_addr)
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{
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writel_relaxed(next_desc_addr, XOR_NEXT_DESC(chan));
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}
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static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan)
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{
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u32 val = readl_relaxed(XOR_INTR_MASK(chan));
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val |= XOR_INTR_MASK_VALUE << (chan->idx * 16);
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writel_relaxed(val, XOR_INTR_MASK(chan));
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}
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static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
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{
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u32 intr_cause = readl_relaxed(XOR_INTR_CAUSE(chan));
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intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF;
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return intr_cause;
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}
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static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
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{
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u32 val;
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val = XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | XOR_INT_STOPPED;
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val = ~(val << (chan->idx * 16));
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dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val);
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writel_relaxed(val, XOR_INTR_CAUSE(chan));
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}
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static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan)
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{
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u32 val = 0xFFFF0000 >> (chan->idx * 16);
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writel_relaxed(val, XOR_INTR_CAUSE(chan));
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}
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static void mv_set_mode(struct mv_xor_chan *chan,
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enum dma_transaction_type type)
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{
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u32 op_mode;
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u32 config = readl_relaxed(XOR_CONFIG(chan));
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switch (type) {
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case DMA_XOR:
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op_mode = XOR_OPERATION_MODE_XOR;
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break;
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case DMA_MEMCPY:
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op_mode = XOR_OPERATION_MODE_MEMCPY;
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break;
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default:
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dev_err(mv_chan_to_devp(chan),
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"error: unsupported operation %d\n",
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type);
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BUG();
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return;
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}
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config &= ~0x7;
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config |= op_mode;
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#if defined(__BIG_ENDIAN)
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config |= XOR_DESCRIPTOR_SWAP;
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#else
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config &= ~XOR_DESCRIPTOR_SWAP;
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#endif
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writel_relaxed(config, XOR_CONFIG(chan));
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chan->current_type = type;
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}
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static void mv_chan_activate(struct mv_xor_chan *chan)
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{
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dev_dbg(mv_chan_to_devp(chan), " activate chan.\n");
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/* writel ensures all descriptors are flushed before activation */
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writel(BIT(0), XOR_ACTIVATION(chan));
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}
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static char mv_chan_is_busy(struct mv_xor_chan *chan)
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{
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u32 state = readl_relaxed(XOR_ACTIVATION(chan));
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state = (state >> 4) & 0x3;
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return (state == 1) ? 1 : 0;
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}
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/**
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* mv_xor_free_slots - flags descriptor slots for reuse
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* @slot: Slot to free
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* Caller must hold &mv_chan->lock while calling this function
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*/
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static void mv_xor_free_slots(struct mv_xor_chan *mv_chan,
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struct mv_xor_desc_slot *slot)
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{
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dev_dbg(mv_chan_to_devp(mv_chan), "%s %d slot %p\n",
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__func__, __LINE__, slot);
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slot->slot_used = 0;
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}
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/*
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* mv_xor_start_new_chain - program the engine to operate on new chain headed by
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* sw_desc
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* Caller must hold &mv_chan->lock while calling this function
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*/
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static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan,
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struct mv_xor_desc_slot *sw_desc)
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{
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dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: sw_desc %p\n",
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__func__, __LINE__, sw_desc);
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/* set the hardware chain */
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mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys);
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mv_chan->pending++;
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mv_xor_issue_pending(&mv_chan->dmachan);
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}
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static dma_cookie_t
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mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
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struct mv_xor_chan *mv_chan, dma_cookie_t cookie)
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{
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BUG_ON(desc->async_tx.cookie < 0);
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if (desc->async_tx.cookie > 0) {
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cookie = desc->async_tx.cookie;
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/* call the callback (must not sleep or submit new
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* operations to this channel)
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*/
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if (desc->async_tx.callback)
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desc->async_tx.callback(
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desc->async_tx.callback_param);
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dma_descriptor_unmap(&desc->async_tx);
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}
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/* run dependent operations */
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dma_run_dependencies(&desc->async_tx);
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return cookie;
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}
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static int
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mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan)
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{
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struct mv_xor_desc_slot *iter, *_iter;
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dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
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list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
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completed_node) {
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if (async_tx_test_ack(&iter->async_tx)) {
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list_del(&iter->completed_node);
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mv_xor_free_slots(mv_chan, iter);
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}
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}
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return 0;
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}
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static int
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mv_xor_clean_slot(struct mv_xor_desc_slot *desc,
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struct mv_xor_chan *mv_chan)
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{
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dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: desc %p flags %d\n",
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__func__, __LINE__, desc, desc->async_tx.flags);
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list_del(&desc->chain_node);
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/* the client is allowed to attach dependent operations
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* until 'ack' is set
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*/
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if (!async_tx_test_ack(&desc->async_tx)) {
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/* move this slot to the completed_slots */
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list_add_tail(&desc->completed_node, &mv_chan->completed_slots);
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return 0;
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}
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mv_xor_free_slots(mv_chan, desc);
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return 0;
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}
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/* This function must be called with the mv_xor_chan spinlock held */
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static void mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
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{
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struct mv_xor_desc_slot *iter, *_iter;
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dma_cookie_t cookie = 0;
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int busy = mv_chan_is_busy(mv_chan);
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u32 current_desc = mv_chan_get_current_desc(mv_chan);
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int seen_current = 0;
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dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
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dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc);
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mv_xor_clean_completed_slots(mv_chan);
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/* free completed slots from the chain starting with
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* the oldest descriptor
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*/
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list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
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chain_node) {
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prefetch(_iter);
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prefetch(&_iter->async_tx);
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/* do not advance past the current descriptor loaded into the
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* hardware channel, subsequent descriptors are either in
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* process or have not been submitted
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*/
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if (seen_current)
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break;
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/* stop the search if we reach the current descriptor and the
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* channel is busy
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*/
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if (iter->async_tx.phys == current_desc) {
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seen_current = 1;
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if (busy)
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break;
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}
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cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie);
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if (mv_xor_clean_slot(iter, mv_chan))
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break;
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}
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if ((busy == 0) && !list_empty(&mv_chan->chain)) {
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struct mv_xor_desc_slot *chain_head;
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chain_head = list_entry(mv_chan->chain.next,
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struct mv_xor_desc_slot,
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chain_node);
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mv_xor_start_new_chain(mv_chan, chain_head);
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}
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if (cookie > 0)
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mv_chan->dmachan.completed_cookie = cookie;
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}
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static void mv_xor_tasklet(unsigned long data)
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{
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struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
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spin_lock_bh(&chan->lock);
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mv_xor_slot_cleanup(chan);
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spin_unlock_bh(&chan->lock);
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}
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static struct mv_xor_desc_slot *
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mv_xor_alloc_slot(struct mv_xor_chan *mv_chan)
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{
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struct mv_xor_desc_slot *iter, *_iter;
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int retry = 0;
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/* start search from the last allocated descrtiptor
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* if a contiguous allocation can not be found start searching
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* from the beginning of the list
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*/
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retry:
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if (retry == 0)
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iter = mv_chan->last_used;
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else
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iter = list_entry(&mv_chan->all_slots,
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struct mv_xor_desc_slot,
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slot_node);
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list_for_each_entry_safe_continue(
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iter, _iter, &mv_chan->all_slots, slot_node) {
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prefetch(_iter);
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prefetch(&_iter->async_tx);
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if (iter->slot_used) {
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/* give up after finding the first busy slot
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* on the second pass through the list
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*/
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if (retry)
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break;
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continue;
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}
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/* pre-ack descriptor */
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async_tx_ack(&iter->async_tx);
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iter->slot_used = 1;
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INIT_LIST_HEAD(&iter->chain_node);
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iter->async_tx.cookie = -EBUSY;
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mv_chan->last_used = iter;
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mv_desc_clear_next_desc(iter);
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return iter;
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}
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if (!retry++)
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goto retry;
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/* try to free some slots if the allocation fails */
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tasklet_schedule(&mv_chan->irq_tasklet);
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return NULL;
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}
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/************************ DMA engine API functions ****************************/
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static dma_cookie_t
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mv_xor_tx_submit(struct dma_async_tx_descriptor *tx)
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{
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struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx);
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struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan);
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struct mv_xor_desc_slot *old_chain_tail;
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dma_cookie_t cookie;
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int new_hw_chain = 1;
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dev_dbg(mv_chan_to_devp(mv_chan),
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"%s sw_desc %p: async_tx %p\n",
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__func__, sw_desc, &sw_desc->async_tx);
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spin_lock_bh(&mv_chan->lock);
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cookie = dma_cookie_assign(tx);
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if (list_empty(&mv_chan->chain))
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list_add_tail(&sw_desc->chain_node, &mv_chan->chain);
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else {
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new_hw_chain = 0;
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old_chain_tail = list_entry(mv_chan->chain.prev,
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struct mv_xor_desc_slot,
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chain_node);
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list_add_tail(&sw_desc->chain_node, &mv_chan->chain);
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dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %pa\n",
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&old_chain_tail->async_tx.phys);
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/* fix up the hardware chain */
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mv_desc_set_next_desc(old_chain_tail, sw_desc->async_tx.phys);
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/* if the channel is not busy */
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if (!mv_chan_is_busy(mv_chan)) {
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u32 current_desc = mv_chan_get_current_desc(mv_chan);
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/*
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* and the curren desc is the end of the chain before
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* the append, then we need to start the channel
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*/
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if (current_desc == old_chain_tail->async_tx.phys)
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new_hw_chain = 1;
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}
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}
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if (new_hw_chain)
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mv_xor_start_new_chain(mv_chan, sw_desc);
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spin_unlock_bh(&mv_chan->lock);
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return cookie;
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}
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/* returns the number of allocated descriptors */
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static int mv_xor_alloc_chan_resources(struct dma_chan *chan)
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{
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void *virt_desc;
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dma_addr_t dma_desc;
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int idx;
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struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
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struct mv_xor_desc_slot *slot = NULL;
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int num_descs_in_pool = MV_XOR_POOL_SIZE/MV_XOR_SLOT_SIZE;
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/* Allocate descriptor slots */
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idx = mv_chan->slots_allocated;
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while (idx < num_descs_in_pool) {
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot) {
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dev_info(mv_chan_to_devp(mv_chan),
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"channel only initialized %d descriptor slots",
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idx);
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break;
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}
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virt_desc = mv_chan->dma_desc_pool_virt;
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slot->hw_desc = virt_desc + idx * MV_XOR_SLOT_SIZE;
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dma_async_tx_descriptor_init(&slot->async_tx, chan);
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slot->async_tx.tx_submit = mv_xor_tx_submit;
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INIT_LIST_HEAD(&slot->chain_node);
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INIT_LIST_HEAD(&slot->slot_node);
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dma_desc = mv_chan->dma_desc_pool;
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slot->async_tx.phys = dma_desc + idx * MV_XOR_SLOT_SIZE;
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slot->idx = idx++;
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spin_lock_bh(&mv_chan->lock);
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mv_chan->slots_allocated = idx;
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list_add_tail(&slot->slot_node, &mv_chan->all_slots);
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spin_unlock_bh(&mv_chan->lock);
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}
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|
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if (mv_chan->slots_allocated && !mv_chan->last_used)
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mv_chan->last_used = list_entry(mv_chan->all_slots.next,
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struct mv_xor_desc_slot,
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slot_node);
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dev_dbg(mv_chan_to_devp(mv_chan),
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"allocated %d descriptor slots last_used: %p\n",
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mv_chan->slots_allocated, mv_chan->last_used);
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|
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return mv_chan->slots_allocated ? : -ENOMEM;
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}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
|
|
unsigned int src_cnt, size_t len, unsigned long flags)
|
|
{
|
|
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
|
|
struct mv_xor_desc_slot *sw_desc;
|
|
|
|
if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
|
|
return NULL;
|
|
|
|
BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
|
|
|
|
dev_dbg(mv_chan_to_devp(mv_chan),
|
|
"%s src_cnt: %d len: %u dest %pad flags: %ld\n",
|
|
__func__, src_cnt, len, &dest, flags);
|
|
|
|
spin_lock_bh(&mv_chan->lock);
|
|
sw_desc = mv_xor_alloc_slot(mv_chan);
|
|
if (sw_desc) {
|
|
sw_desc->type = DMA_XOR;
|
|
sw_desc->async_tx.flags = flags;
|
|
mv_desc_init(sw_desc, dest, len, flags);
|
|
while (src_cnt--)
|
|
mv_desc_set_src_addr(sw_desc, src_cnt, src[src_cnt]);
|
|
}
|
|
spin_unlock_bh(&mv_chan->lock);
|
|
dev_dbg(mv_chan_to_devp(mv_chan),
|
|
"%s sw_desc %p async_tx %p \n",
|
|
__func__, sw_desc, &sw_desc->async_tx);
|
|
return sw_desc ? &sw_desc->async_tx : NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
|
|
size_t len, unsigned long flags)
|
|
{
|
|
/*
|
|
* A MEMCPY operation is identical to an XOR operation with only
|
|
* a single source address.
|
|
*/
|
|
return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags);
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
mv_xor_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
|
|
{
|
|
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
|
|
dma_addr_t src, dest;
|
|
size_t len;
|
|
|
|
src = mv_chan->dummy_src_addr;
|
|
dest = mv_chan->dummy_dst_addr;
|
|
len = MV_XOR_MIN_BYTE_COUNT;
|
|
|
|
/*
|
|
* We implement the DMA_INTERRUPT operation as a minimum sized
|
|
* XOR operation with a single dummy source address.
|
|
*/
|
|
return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags);
|
|
}
|
|
|
|
static void mv_xor_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
|
|
struct mv_xor_desc_slot *iter, *_iter;
|
|
int in_use_descs = 0;
|
|
|
|
spin_lock_bh(&mv_chan->lock);
|
|
|
|
mv_xor_slot_cleanup(mv_chan);
|
|
|
|
list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
|
|
chain_node) {
|
|
in_use_descs++;
|
|
list_del(&iter->chain_node);
|
|
}
|
|
list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots,
|
|
completed_node) {
|
|
in_use_descs++;
|
|
list_del(&iter->completed_node);
|
|
}
|
|
list_for_each_entry_safe_reverse(
|
|
iter, _iter, &mv_chan->all_slots, slot_node) {
|
|
list_del(&iter->slot_node);
|
|
kfree(iter);
|
|
mv_chan->slots_allocated--;
|
|
}
|
|
mv_chan->last_used = NULL;
|
|
|
|
dev_dbg(mv_chan_to_devp(mv_chan), "%s slots_allocated %d\n",
|
|
__func__, mv_chan->slots_allocated);
|
|
spin_unlock_bh(&mv_chan->lock);
|
|
|
|
if (in_use_descs)
|
|
dev_err(mv_chan_to_devp(mv_chan),
|
|
"freeing %d in use descriptors!\n", in_use_descs);
|
|
}
|
|
|
|
/**
|
|
* mv_xor_status - poll the status of an XOR transaction
|
|
* @chan: XOR channel handle
|
|
* @cookie: XOR transaction identifier
|
|
* @txstate: XOR transactions state holder (or NULL)
|
|
*/
|
|
static enum dma_status mv_xor_status(struct dma_chan *chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
|
|
enum dma_status ret;
|
|
|
|
ret = dma_cookie_status(chan, cookie, txstate);
|
|
if (ret == DMA_COMPLETE)
|
|
return ret;
|
|
|
|
spin_lock_bh(&mv_chan->lock);
|
|
mv_xor_slot_cleanup(mv_chan);
|
|
spin_unlock_bh(&mv_chan->lock);
|
|
|
|
return dma_cookie_status(chan, cookie, txstate);
|
|
}
|
|
|
|
static void mv_dump_xor_regs(struct mv_xor_chan *chan)
|
|
{
|
|
u32 val;
|
|
|
|
val = readl_relaxed(XOR_CONFIG(chan));
|
|
dev_err(mv_chan_to_devp(chan), "config 0x%08x\n", val);
|
|
|
|
val = readl_relaxed(XOR_ACTIVATION(chan));
|
|
dev_err(mv_chan_to_devp(chan), "activation 0x%08x\n", val);
|
|
|
|
val = readl_relaxed(XOR_INTR_CAUSE(chan));
|
|
dev_err(mv_chan_to_devp(chan), "intr cause 0x%08x\n", val);
|
|
|
|
val = readl_relaxed(XOR_INTR_MASK(chan));
|
|
dev_err(mv_chan_to_devp(chan), "intr mask 0x%08x\n", val);
|
|
|
|
val = readl_relaxed(XOR_ERROR_CAUSE(chan));
|
|
dev_err(mv_chan_to_devp(chan), "error cause 0x%08x\n", val);
|
|
|
|
val = readl_relaxed(XOR_ERROR_ADDR(chan));
|
|
dev_err(mv_chan_to_devp(chan), "error addr 0x%08x\n", val);
|
|
}
|
|
|
|
static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan,
|
|
u32 intr_cause)
|
|
{
|
|
if (intr_cause & XOR_INT_ERR_DECODE) {
|
|
dev_dbg(mv_chan_to_devp(chan), "ignoring address decode error\n");
|
|
return;
|
|
}
|
|
|
|
dev_err(mv_chan_to_devp(chan), "error on chan %d. intr cause 0x%08x\n",
|
|
chan->idx, intr_cause);
|
|
|
|
mv_dump_xor_regs(chan);
|
|
WARN_ON(1);
|
|
}
|
|
|
|
static irqreturn_t mv_xor_interrupt_handler(int irq, void *data)
|
|
{
|
|
struct mv_xor_chan *chan = data;
|
|
u32 intr_cause = mv_chan_get_intr_cause(chan);
|
|
|
|
dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause);
|
|
|
|
if (intr_cause & XOR_INTR_ERRORS)
|
|
mv_xor_err_interrupt_handler(chan, intr_cause);
|
|
|
|
tasklet_schedule(&chan->irq_tasklet);
|
|
|
|
mv_xor_device_clear_eoc_cause(chan);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void mv_xor_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
|
|
|
|
if (mv_chan->pending >= MV_XOR_THRESHOLD) {
|
|
mv_chan->pending = 0;
|
|
mv_chan_activate(mv_chan);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform a transaction to verify the HW works.
|
|
*/
|
|
|
|
static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
|
|
{
|
|
int i, ret;
|
|
void *src, *dest;
|
|
dma_addr_t src_dma, dest_dma;
|
|
struct dma_chan *dma_chan;
|
|
dma_cookie_t cookie;
|
|
struct dma_async_tx_descriptor *tx;
|
|
struct dmaengine_unmap_data *unmap;
|
|
int err = 0;
|
|
|
|
src = kmalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL);
|
|
if (!src)
|
|
return -ENOMEM;
|
|
|
|
dest = kzalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL);
|
|
if (!dest) {
|
|
kfree(src);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Fill in src buffer */
|
|
for (i = 0; i < PAGE_SIZE; i++)
|
|
((u8 *) src)[i] = (u8)i;
|
|
|
|
dma_chan = &mv_chan->dmachan;
|
|
if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
unmap = dmaengine_get_unmap_data(dma_chan->device->dev, 2, GFP_KERNEL);
|
|
if (!unmap) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
|
|
src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src), 0,
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
unmap->addr[0] = src_dma;
|
|
|
|
ret = dma_mapping_error(dma_chan->device->dev, src_dma);
|
|
if (ret) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
unmap->to_cnt = 1;
|
|
|
|
dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest), 0,
|
|
PAGE_SIZE, DMA_FROM_DEVICE);
|
|
unmap->addr[1] = dest_dma;
|
|
|
|
ret = dma_mapping_error(dma_chan->device->dev, dest_dma);
|
|
if (ret) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
unmap->from_cnt = 1;
|
|
unmap->len = PAGE_SIZE;
|
|
|
|
tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
|
|
PAGE_SIZE, 0);
|
|
if (!tx) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test cannot prepare operation, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
cookie = mv_xor_tx_submit(tx);
|
|
if (dma_submit_error(cookie)) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test submit error, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
mv_xor_issue_pending(dma_chan);
|
|
async_tx_ack(tx);
|
|
msleep(1);
|
|
|
|
if (mv_xor_status(dma_chan, cookie, NULL) !=
|
|
DMA_COMPLETE) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test copy timed out, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
|
|
PAGE_SIZE, DMA_FROM_DEVICE);
|
|
if (memcmp(src, dest, PAGE_SIZE)) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test copy failed compare, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
free_resources:
|
|
dmaengine_unmap_put(unmap);
|
|
mv_xor_free_chan_resources(dma_chan);
|
|
out:
|
|
kfree(src);
|
|
kfree(dest);
|
|
return err;
|
|
}
|
|
|
|
#define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */
|
|
static int
|
|
mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
|
|
{
|
|
int i, src_idx, ret;
|
|
struct page *dest;
|
|
struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
|
|
dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
|
|
dma_addr_t dest_dma;
|
|
struct dma_async_tx_descriptor *tx;
|
|
struct dmaengine_unmap_data *unmap;
|
|
struct dma_chan *dma_chan;
|
|
dma_cookie_t cookie;
|
|
u8 cmp_byte = 0;
|
|
u32 cmp_word;
|
|
int err = 0;
|
|
int src_count = MV_XOR_NUM_SRC_TEST;
|
|
|
|
for (src_idx = 0; src_idx < src_count; src_idx++) {
|
|
xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
|
|
if (!xor_srcs[src_idx]) {
|
|
while (src_idx--)
|
|
__free_page(xor_srcs[src_idx]);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
dest = alloc_page(GFP_KERNEL);
|
|
if (!dest) {
|
|
while (src_idx--)
|
|
__free_page(xor_srcs[src_idx]);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Fill in src buffers */
|
|
for (src_idx = 0; src_idx < src_count; src_idx++) {
|
|
u8 *ptr = page_address(xor_srcs[src_idx]);
|
|
for (i = 0; i < PAGE_SIZE; i++)
|
|
ptr[i] = (1 << src_idx);
|
|
}
|
|
|
|
for (src_idx = 0; src_idx < src_count; src_idx++)
|
|
cmp_byte ^= (u8) (1 << src_idx);
|
|
|
|
cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
|
|
(cmp_byte << 8) | cmp_byte;
|
|
|
|
memset(page_address(dest), 0, PAGE_SIZE);
|
|
|
|
dma_chan = &mv_chan->dmachan;
|
|
if (mv_xor_alloc_chan_resources(dma_chan) < 1) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
unmap = dmaengine_get_unmap_data(dma_chan->device->dev, src_count + 1,
|
|
GFP_KERNEL);
|
|
if (!unmap) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
|
|
/* test xor */
|
|
for (i = 0; i < src_count; i++) {
|
|
unmap->addr[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
|
|
0, PAGE_SIZE, DMA_TO_DEVICE);
|
|
dma_srcs[i] = unmap->addr[i];
|
|
ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[i]);
|
|
if (ret) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
unmap->to_cnt++;
|
|
}
|
|
|
|
unmap->addr[src_count] = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
|
|
DMA_FROM_DEVICE);
|
|
dest_dma = unmap->addr[src_count];
|
|
ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[src_count]);
|
|
if (ret) {
|
|
err = -ENOMEM;
|
|
goto free_resources;
|
|
}
|
|
unmap->from_cnt = 1;
|
|
unmap->len = PAGE_SIZE;
|
|
|
|
tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
|
|
src_count, PAGE_SIZE, 0);
|
|
if (!tx) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test cannot prepare operation, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
cookie = mv_xor_tx_submit(tx);
|
|
if (dma_submit_error(cookie)) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test submit error, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
mv_xor_issue_pending(dma_chan);
|
|
async_tx_ack(tx);
|
|
msleep(8);
|
|
|
|
if (mv_xor_status(dma_chan, cookie, NULL) !=
|
|
DMA_COMPLETE) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test xor timed out, disabling\n");
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
|
|
dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma,
|
|
PAGE_SIZE, DMA_FROM_DEVICE);
|
|
for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
|
|
u32 *ptr = page_address(dest);
|
|
if (ptr[i] != cmp_word) {
|
|
dev_err(dma_chan->device->dev,
|
|
"Self-test xor failed compare, disabling. index %d, data %x, expected %x\n",
|
|
i, ptr[i], cmp_word);
|
|
err = -ENODEV;
|
|
goto free_resources;
|
|
}
|
|
}
|
|
|
|
free_resources:
|
|
dmaengine_unmap_put(unmap);
|
|
mv_xor_free_chan_resources(dma_chan);
|
|
out:
|
|
src_idx = src_count;
|
|
while (src_idx--)
|
|
__free_page(xor_srcs[src_idx]);
|
|
__free_page(dest);
|
|
return err;
|
|
}
|
|
|
|
/* This driver does not implement any of the optional DMA operations. */
|
|
static int
|
|
mv_xor_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
|
|
unsigned long arg)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
|
|
{
|
|
struct dma_chan *chan, *_chan;
|
|
struct device *dev = mv_chan->dmadev.dev;
|
|
|
|
dma_async_device_unregister(&mv_chan->dmadev);
|
|
|
|
dma_free_coherent(dev, MV_XOR_POOL_SIZE,
|
|
mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
|
|
dma_unmap_single(dev, mv_chan->dummy_src_addr,
|
|
MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE);
|
|
dma_unmap_single(dev, mv_chan->dummy_dst_addr,
|
|
MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE);
|
|
|
|
list_for_each_entry_safe(chan, _chan, &mv_chan->dmadev.channels,
|
|
device_node) {
|
|
list_del(&chan->device_node);
|
|
}
|
|
|
|
free_irq(mv_chan->irq, mv_chan);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct mv_xor_chan *
|
|
mv_xor_channel_add(struct mv_xor_device *xordev,
|
|
struct platform_device *pdev,
|
|
int idx, dma_cap_mask_t cap_mask, int irq)
|
|
{
|
|
int ret = 0;
|
|
struct mv_xor_chan *mv_chan;
|
|
struct dma_device *dma_dev;
|
|
|
|
mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL);
|
|
if (!mv_chan)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mv_chan->idx = idx;
|
|
mv_chan->irq = irq;
|
|
|
|
dma_dev = &mv_chan->dmadev;
|
|
|
|
/*
|
|
* These source and destination dummy buffers are used to implement
|
|
* a DMA_INTERRUPT operation as a minimum-sized XOR operation.
|
|
* Hence, we only need to map the buffers at initialization-time.
|
|
*/
|
|
mv_chan->dummy_src_addr = dma_map_single(dma_dev->dev,
|
|
mv_chan->dummy_src, MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE);
|
|
mv_chan->dummy_dst_addr = dma_map_single(dma_dev->dev,
|
|
mv_chan->dummy_dst, MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE);
|
|
|
|
/* allocate coherent memory for hardware descriptors
|
|
* note: writecombine gives slightly better performance, but
|
|
* requires that we explicitly flush the writes
|
|
*/
|
|
mv_chan->dma_desc_pool_virt =
|
|
dma_alloc_writecombine(&pdev->dev, MV_XOR_POOL_SIZE,
|
|
&mv_chan->dma_desc_pool, GFP_KERNEL);
|
|
if (!mv_chan->dma_desc_pool_virt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* discover transaction capabilites from the platform data */
|
|
dma_dev->cap_mask = cap_mask;
|
|
|
|
INIT_LIST_HEAD(&dma_dev->channels);
|
|
|
|
/* set base routines */
|
|
dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources;
|
|
dma_dev->device_free_chan_resources = mv_xor_free_chan_resources;
|
|
dma_dev->device_tx_status = mv_xor_status;
|
|
dma_dev->device_issue_pending = mv_xor_issue_pending;
|
|
dma_dev->device_control = mv_xor_control;
|
|
dma_dev->dev = &pdev->dev;
|
|
|
|
/* set prep routines based on capability */
|
|
if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
|
|
dma_dev->device_prep_dma_interrupt = mv_xor_prep_dma_interrupt;
|
|
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
|
|
dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy;
|
|
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
|
|
dma_dev->max_xor = 8;
|
|
dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor;
|
|
}
|
|
|
|
mv_chan->mmr_base = xordev->xor_base;
|
|
mv_chan->mmr_high_base = xordev->xor_high_base;
|
|
tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long)
|
|
mv_chan);
|
|
|
|
/* clear errors before enabling interrupts */
|
|
mv_xor_device_clear_err_status(mv_chan);
|
|
|
|
ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler,
|
|
0, dev_name(&pdev->dev), mv_chan);
|
|
if (ret)
|
|
goto err_free_dma;
|
|
|
|
mv_chan_unmask_interrupts(mv_chan);
|
|
|
|
mv_set_mode(mv_chan, DMA_XOR);
|
|
|
|
spin_lock_init(&mv_chan->lock);
|
|
INIT_LIST_HEAD(&mv_chan->chain);
|
|
INIT_LIST_HEAD(&mv_chan->completed_slots);
|
|
INIT_LIST_HEAD(&mv_chan->all_slots);
|
|
mv_chan->dmachan.device = dma_dev;
|
|
dma_cookie_init(&mv_chan->dmachan);
|
|
|
|
list_add_tail(&mv_chan->dmachan.device_node, &dma_dev->channels);
|
|
|
|
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
|
|
ret = mv_xor_memcpy_self_test(mv_chan);
|
|
dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
|
|
if (ret)
|
|
goto err_free_irq;
|
|
}
|
|
|
|
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
|
|
ret = mv_xor_xor_self_test(mv_chan);
|
|
dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
|
|
if (ret)
|
|
goto err_free_irq;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "Marvell XOR: ( %s%s%s)\n",
|
|
dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
|
|
dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
|
|
dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
|
|
|
|
dma_async_device_register(dma_dev);
|
|
return mv_chan;
|
|
|
|
err_free_irq:
|
|
free_irq(mv_chan->irq, mv_chan);
|
|
err_free_dma:
|
|
dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE,
|
|
mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void
|
|
mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
|
|
const struct mbus_dram_target_info *dram)
|
|
{
|
|
void __iomem *base = xordev->xor_high_base;
|
|
u32 win_enable = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
writel(0, base + WINDOW_BASE(i));
|
|
writel(0, base + WINDOW_SIZE(i));
|
|
if (i < 4)
|
|
writel(0, base + WINDOW_REMAP_HIGH(i));
|
|
}
|
|
|
|
for (i = 0; i < dram->num_cs; i++) {
|
|
const struct mbus_dram_window *cs = dram->cs + i;
|
|
|
|
writel((cs->base & 0xffff0000) |
|
|
(cs->mbus_attr << 8) |
|
|
dram->mbus_dram_target_id, base + WINDOW_BASE(i));
|
|
writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
|
|
|
|
win_enable |= (1 << i);
|
|
win_enable |= 3 << (16 + (2 * i));
|
|
}
|
|
|
|
writel(win_enable, base + WINDOW_BAR_ENABLE(0));
|
|
writel(win_enable, base + WINDOW_BAR_ENABLE(1));
|
|
writel(0, base + WINDOW_OVERRIDE_CTRL(0));
|
|
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
|
|
}
|
|
|
|
static int mv_xor_probe(struct platform_device *pdev)
|
|
{
|
|
const struct mbus_dram_target_info *dram;
|
|
struct mv_xor_device *xordev;
|
|
struct mv_xor_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct resource *res;
|
|
int i, ret;
|
|
|
|
dev_notice(&pdev->dev, "Marvell shared XOR driver\n");
|
|
|
|
xordev = devm_kzalloc(&pdev->dev, sizeof(*xordev), GFP_KERNEL);
|
|
if (!xordev)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
xordev->xor_base = devm_ioremap(&pdev->dev, res->start,
|
|
resource_size(res));
|
|
if (!xordev->xor_base)
|
|
return -EBUSY;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
xordev->xor_high_base = devm_ioremap(&pdev->dev, res->start,
|
|
resource_size(res));
|
|
if (!xordev->xor_high_base)
|
|
return -EBUSY;
|
|
|
|
platform_set_drvdata(pdev, xordev);
|
|
|
|
/*
|
|
* (Re-)program MBUS remapping windows if we are asked to.
|
|
*/
|
|
dram = mv_mbus_dram_info();
|
|
if (dram)
|
|
mv_xor_conf_mbus_windows(xordev, dram);
|
|
|
|
/* Not all platforms can gate the clock, so it is not
|
|
* an error if the clock does not exists.
|
|
*/
|
|
xordev->clk = clk_get(&pdev->dev, NULL);
|
|
if (!IS_ERR(xordev->clk))
|
|
clk_prepare_enable(xordev->clk);
|
|
|
|
if (pdev->dev.of_node) {
|
|
struct device_node *np;
|
|
int i = 0;
|
|
|
|
for_each_child_of_node(pdev->dev.of_node, np) {
|
|
struct mv_xor_chan *chan;
|
|
dma_cap_mask_t cap_mask;
|
|
int irq;
|
|
|
|
dma_cap_zero(cap_mask);
|
|
if (of_property_read_bool(np, "dmacap,memcpy"))
|
|
dma_cap_set(DMA_MEMCPY, cap_mask);
|
|
if (of_property_read_bool(np, "dmacap,xor"))
|
|
dma_cap_set(DMA_XOR, cap_mask);
|
|
if (of_property_read_bool(np, "dmacap,interrupt"))
|
|
dma_cap_set(DMA_INTERRUPT, cap_mask);
|
|
|
|
irq = irq_of_parse_and_map(np, 0);
|
|
if (!irq) {
|
|
ret = -ENODEV;
|
|
goto err_channel_add;
|
|
}
|
|
|
|
chan = mv_xor_channel_add(xordev, pdev, i,
|
|
cap_mask, irq);
|
|
if (IS_ERR(chan)) {
|
|
ret = PTR_ERR(chan);
|
|
irq_dispose_mapping(irq);
|
|
goto err_channel_add;
|
|
}
|
|
|
|
xordev->channels[i] = chan;
|
|
i++;
|
|
}
|
|
} else if (pdata && pdata->channels) {
|
|
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
|
|
struct mv_xor_channel_data *cd;
|
|
struct mv_xor_chan *chan;
|
|
int irq;
|
|
|
|
cd = &pdata->channels[i];
|
|
if (!cd) {
|
|
ret = -ENODEV;
|
|
goto err_channel_add;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, i);
|
|
if (irq < 0) {
|
|
ret = irq;
|
|
goto err_channel_add;
|
|
}
|
|
|
|
chan = mv_xor_channel_add(xordev, pdev, i,
|
|
cd->cap_mask, irq);
|
|
if (IS_ERR(chan)) {
|
|
ret = PTR_ERR(chan);
|
|
goto err_channel_add;
|
|
}
|
|
|
|
xordev->channels[i] = chan;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_channel_add:
|
|
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++)
|
|
if (xordev->channels[i]) {
|
|
mv_xor_channel_remove(xordev->channels[i]);
|
|
if (pdev->dev.of_node)
|
|
irq_dispose_mapping(xordev->channels[i]->irq);
|
|
}
|
|
|
|
if (!IS_ERR(xordev->clk)) {
|
|
clk_disable_unprepare(xordev->clk);
|
|
clk_put(xordev->clk);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mv_xor_remove(struct platform_device *pdev)
|
|
{
|
|
struct mv_xor_device *xordev = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
|
|
if (xordev->channels[i])
|
|
mv_xor_channel_remove(xordev->channels[i]);
|
|
}
|
|
|
|
if (!IS_ERR(xordev->clk)) {
|
|
clk_disable_unprepare(xordev->clk);
|
|
clk_put(xordev->clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct of_device_id mv_xor_dt_ids[] = {
|
|
{ .compatible = "marvell,orion-xor", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mv_xor_dt_ids);
|
|
#endif
|
|
|
|
static struct platform_driver mv_xor_driver = {
|
|
.probe = mv_xor_probe,
|
|
.remove = mv_xor_remove,
|
|
.driver = {
|
|
.name = MV_XOR_NAME,
|
|
.of_match_table = of_match_ptr(mv_xor_dt_ids),
|
|
},
|
|
};
|
|
|
|
|
|
static int __init mv_xor_init(void)
|
|
{
|
|
return platform_driver_register(&mv_xor_driver);
|
|
}
|
|
module_init(mv_xor_init);
|
|
|
|
/* it's currently unsafe to unload this module */
|
|
#if 0
|
|
static void __exit mv_xor_exit(void)
|
|
{
|
|
platform_driver_unregister(&mv_xor_driver);
|
|
return;
|
|
}
|
|
|
|
module_exit(mv_xor_exit);
|
|
#endif
|
|
|
|
MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
|
|
MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine");
|
|
MODULE_LICENSE("GPL");
|