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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Kees Cook](/assets/img/avatar_default.png)
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kmalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kmalloc(struct_size(instance, entry, count), GFP_KERNEL); This patch makes the changes for kmalloc()-family (and kvmalloc()-family) uses. It was done via automatic conversion with manual review for the "CHECKME" non-standard cases noted below, using the following Coccinelle script: // pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len * // sizeof *pkey_cache->table, GFP_KERNEL); @@ identifier alloc =~ "kmalloc|kzalloc|kvmalloc|kvzalloc"; expression GFP; identifier VAR, ELEMENT; expression COUNT; @@ - alloc(sizeof(*VAR) + COUNT * sizeof(*VAR->ELEMENT), GFP) + alloc(struct_size(VAR, ELEMENT, COUNT), GFP) // mr = kzalloc(sizeof(*mr) + m * sizeof(mr->map[0]), GFP_KERNEL); @@ identifier alloc =~ "kmalloc|kzalloc|kvmalloc|kvzalloc"; expression GFP; identifier VAR, ELEMENT; expression COUNT; @@ - alloc(sizeof(*VAR) + COUNT * sizeof(VAR->ELEMENT[0]), GFP) + alloc(struct_size(VAR, ELEMENT, COUNT), GFP) // Same pattern, but can't trivially locate the trailing element name, // or variable name. @@ identifier alloc =~ "kmalloc|kzalloc|kvmalloc|kvzalloc"; expression GFP; expression SOMETHING, COUNT, ELEMENT; @@ - alloc(sizeof(SOMETHING) + COUNT * sizeof(ELEMENT), GFP) + alloc(CHECKME_struct_size(&SOMETHING, ELEMENT, COUNT), GFP) Signed-off-by: Kees Cook <keescook@chromium.org>
682 lines
16 KiB
C
682 lines
16 KiB
C
/*
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* MOXA ART SoCs DMA Engine support.
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*
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* Copyright (C) 2013 Jonas Jensen
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*
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* Jonas Jensen <jonas.jensen@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_dma.h>
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#include <linux/bitops.h>
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#include <asm/cacheflush.h>
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#include "dmaengine.h"
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#include "virt-dma.h"
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#define APB_DMA_MAX_CHANNEL 4
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#define REG_OFF_ADDRESS_SOURCE 0
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#define REG_OFF_ADDRESS_DEST 4
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#define REG_OFF_CYCLES 8
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#define REG_OFF_CTRL 12
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#define REG_OFF_CHAN_SIZE 16
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#define APB_DMA_ENABLE BIT(0)
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#define APB_DMA_FIN_INT_STS BIT(1)
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#define APB_DMA_FIN_INT_EN BIT(2)
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#define APB_DMA_BURST_MODE BIT(3)
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#define APB_DMA_ERR_INT_STS BIT(4)
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#define APB_DMA_ERR_INT_EN BIT(5)
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/*
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* Unset: APB
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* Set: AHB
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*/
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#define APB_DMA_SOURCE_SELECT 0x40
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#define APB_DMA_DEST_SELECT 0x80
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#define APB_DMA_SOURCE 0x100
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#define APB_DMA_DEST 0x1000
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#define APB_DMA_SOURCE_MASK 0x700
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#define APB_DMA_DEST_MASK 0x7000
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/*
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* 000: No increment
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* 001: +1 (Burst=0), +4 (Burst=1)
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* 010: +2 (Burst=0), +8 (Burst=1)
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* 011: +4 (Burst=0), +16 (Burst=1)
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* 101: -1 (Burst=0), -4 (Burst=1)
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* 110: -2 (Burst=0), -8 (Burst=1)
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* 111: -4 (Burst=0), -16 (Burst=1)
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*/
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#define APB_DMA_SOURCE_INC_0 0
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#define APB_DMA_SOURCE_INC_1_4 0x100
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#define APB_DMA_SOURCE_INC_2_8 0x200
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#define APB_DMA_SOURCE_INC_4_16 0x300
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#define APB_DMA_SOURCE_DEC_1_4 0x500
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#define APB_DMA_SOURCE_DEC_2_8 0x600
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#define APB_DMA_SOURCE_DEC_4_16 0x700
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#define APB_DMA_DEST_INC_0 0
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#define APB_DMA_DEST_INC_1_4 0x1000
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#define APB_DMA_DEST_INC_2_8 0x2000
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#define APB_DMA_DEST_INC_4_16 0x3000
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#define APB_DMA_DEST_DEC_1_4 0x5000
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#define APB_DMA_DEST_DEC_2_8 0x6000
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#define APB_DMA_DEST_DEC_4_16 0x7000
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/*
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* Request signal select source/destination address for DMA hardware handshake.
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*
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* The request line number is a property of the DMA controller itself,
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* e.g. MMC must always request channels where dma_slave_config->slave_id is 5.
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*
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* 0: No request / Grant signal
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* 1-15: Request / Grant signal
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*/
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#define APB_DMA_SOURCE_REQ_NO 0x1000000
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#define APB_DMA_SOURCE_REQ_NO_MASK 0xf000000
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#define APB_DMA_DEST_REQ_NO 0x10000
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#define APB_DMA_DEST_REQ_NO_MASK 0xf0000
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#define APB_DMA_DATA_WIDTH 0x100000
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#define APB_DMA_DATA_WIDTH_MASK 0x300000
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/*
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* Data width of transfer:
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*
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* 00: Word
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* 01: Half
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* 10: Byte
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*/
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#define APB_DMA_DATA_WIDTH_4 0
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#define APB_DMA_DATA_WIDTH_2 0x100000
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#define APB_DMA_DATA_WIDTH_1 0x200000
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#define APB_DMA_CYCLES_MASK 0x00ffffff
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#define MOXART_DMA_DATA_TYPE_S8 0x00
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#define MOXART_DMA_DATA_TYPE_S16 0x01
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#define MOXART_DMA_DATA_TYPE_S32 0x02
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struct moxart_sg {
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dma_addr_t addr;
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uint32_t len;
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};
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struct moxart_desc {
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enum dma_transfer_direction dma_dir;
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dma_addr_t dev_addr;
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unsigned int sglen;
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unsigned int dma_cycles;
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struct virt_dma_desc vd;
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uint8_t es;
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struct moxart_sg sg[0];
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};
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struct moxart_chan {
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struct virt_dma_chan vc;
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void __iomem *base;
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struct moxart_desc *desc;
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struct dma_slave_config cfg;
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bool allocated;
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bool error;
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int ch_num;
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unsigned int line_reqno;
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unsigned int sgidx;
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};
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struct moxart_dmadev {
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struct dma_device dma_slave;
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struct moxart_chan slave_chans[APB_DMA_MAX_CHANNEL];
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unsigned int irq;
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};
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struct moxart_filter_data {
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struct moxart_dmadev *mdc;
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struct of_phandle_args *dma_spec;
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};
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static const unsigned int es_bytes[] = {
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[MOXART_DMA_DATA_TYPE_S8] = 1,
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[MOXART_DMA_DATA_TYPE_S16] = 2,
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[MOXART_DMA_DATA_TYPE_S32] = 4,
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};
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static struct device *chan2dev(struct dma_chan *chan)
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{
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return &chan->dev->device;
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}
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static inline struct moxart_chan *to_moxart_dma_chan(struct dma_chan *c)
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{
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return container_of(c, struct moxart_chan, vc.chan);
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}
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static inline struct moxart_desc *to_moxart_dma_desc(
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struct dma_async_tx_descriptor *t)
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{
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return container_of(t, struct moxart_desc, vd.tx);
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}
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static void moxart_dma_desc_free(struct virt_dma_desc *vd)
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{
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kfree(container_of(vd, struct moxart_desc, vd));
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}
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static int moxart_terminate_all(struct dma_chan *chan)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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unsigned long flags;
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LIST_HEAD(head);
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u32 ctrl;
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dev_dbg(chan2dev(chan), "%s: ch=%p\n", __func__, ch);
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spin_lock_irqsave(&ch->vc.lock, flags);
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if (ch->desc) {
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moxart_dma_desc_free(&ch->desc->vd);
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ch->desc = NULL;
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}
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ctrl = readl(ch->base + REG_OFF_CTRL);
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ctrl &= ~(APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
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writel(ctrl, ch->base + REG_OFF_CTRL);
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vchan_get_all_descriptors(&ch->vc, &head);
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spin_unlock_irqrestore(&ch->vc.lock, flags);
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vchan_dma_desc_free_list(&ch->vc, &head);
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return 0;
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}
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static int moxart_slave_config(struct dma_chan *chan,
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struct dma_slave_config *cfg)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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u32 ctrl;
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ch->cfg = *cfg;
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ctrl = readl(ch->base + REG_OFF_CTRL);
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ctrl |= APB_DMA_BURST_MODE;
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ctrl &= ~(APB_DMA_DEST_MASK | APB_DMA_SOURCE_MASK);
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ctrl &= ~(APB_DMA_DEST_REQ_NO_MASK | APB_DMA_SOURCE_REQ_NO_MASK);
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switch (ch->cfg.src_addr_width) {
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case DMA_SLAVE_BUSWIDTH_1_BYTE:
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ctrl |= APB_DMA_DATA_WIDTH_1;
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if (ch->cfg.direction != DMA_MEM_TO_DEV)
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ctrl |= APB_DMA_DEST_INC_1_4;
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else
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ctrl |= APB_DMA_SOURCE_INC_1_4;
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break;
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case DMA_SLAVE_BUSWIDTH_2_BYTES:
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ctrl |= APB_DMA_DATA_WIDTH_2;
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if (ch->cfg.direction != DMA_MEM_TO_DEV)
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ctrl |= APB_DMA_DEST_INC_2_8;
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else
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ctrl |= APB_DMA_SOURCE_INC_2_8;
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break;
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case DMA_SLAVE_BUSWIDTH_4_BYTES:
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ctrl &= ~APB_DMA_DATA_WIDTH;
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if (ch->cfg.direction != DMA_MEM_TO_DEV)
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ctrl |= APB_DMA_DEST_INC_4_16;
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else
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ctrl |= APB_DMA_SOURCE_INC_4_16;
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break;
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default:
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return -EINVAL;
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}
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if (ch->cfg.direction == DMA_MEM_TO_DEV) {
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ctrl &= ~APB_DMA_DEST_SELECT;
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ctrl |= APB_DMA_SOURCE_SELECT;
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ctrl |= (ch->line_reqno << 16 &
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APB_DMA_DEST_REQ_NO_MASK);
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} else {
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ctrl |= APB_DMA_DEST_SELECT;
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ctrl &= ~APB_DMA_SOURCE_SELECT;
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ctrl |= (ch->line_reqno << 24 &
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APB_DMA_SOURCE_REQ_NO_MASK);
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}
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writel(ctrl, ch->base + REG_OFF_CTRL);
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return 0;
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}
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static struct dma_async_tx_descriptor *moxart_prep_slave_sg(
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struct dma_chan *chan, struct scatterlist *sgl,
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unsigned int sg_len, enum dma_transfer_direction dir,
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unsigned long tx_flags, void *context)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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struct moxart_desc *d;
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enum dma_slave_buswidth dev_width;
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dma_addr_t dev_addr;
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struct scatterlist *sgent;
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unsigned int es;
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unsigned int i;
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if (!is_slave_direction(dir)) {
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dev_err(chan2dev(chan), "%s: invalid DMA direction\n",
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__func__);
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return NULL;
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}
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if (dir == DMA_DEV_TO_MEM) {
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dev_addr = ch->cfg.src_addr;
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dev_width = ch->cfg.src_addr_width;
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} else {
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dev_addr = ch->cfg.dst_addr;
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dev_width = ch->cfg.dst_addr_width;
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}
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switch (dev_width) {
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case DMA_SLAVE_BUSWIDTH_1_BYTE:
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es = MOXART_DMA_DATA_TYPE_S8;
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break;
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case DMA_SLAVE_BUSWIDTH_2_BYTES:
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es = MOXART_DMA_DATA_TYPE_S16;
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break;
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case DMA_SLAVE_BUSWIDTH_4_BYTES:
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es = MOXART_DMA_DATA_TYPE_S32;
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break;
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default:
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dev_err(chan2dev(chan), "%s: unsupported data width (%u)\n",
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__func__, dev_width);
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return NULL;
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}
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d = kzalloc(struct_size(d, sg, sg_len), GFP_ATOMIC);
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if (!d)
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return NULL;
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d->dma_dir = dir;
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d->dev_addr = dev_addr;
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d->es = es;
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for_each_sg(sgl, sgent, sg_len, i) {
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d->sg[i].addr = sg_dma_address(sgent);
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d->sg[i].len = sg_dma_len(sgent);
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}
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d->sglen = sg_len;
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ch->error = 0;
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return vchan_tx_prep(&ch->vc, &d->vd, tx_flags);
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}
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static struct dma_chan *moxart_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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struct moxart_dmadev *mdc = ofdma->of_dma_data;
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struct dma_chan *chan;
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struct moxart_chan *ch;
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chan = dma_get_any_slave_channel(&mdc->dma_slave);
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if (!chan)
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return NULL;
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ch = to_moxart_dma_chan(chan);
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ch->line_reqno = dma_spec->args[0];
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return chan;
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}
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static int moxart_alloc_chan_resources(struct dma_chan *chan)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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dev_dbg(chan2dev(chan), "%s: allocating channel #%u\n",
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__func__, ch->ch_num);
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ch->allocated = 1;
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return 0;
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}
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static void moxart_free_chan_resources(struct dma_chan *chan)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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vchan_free_chan_resources(&ch->vc);
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dev_dbg(chan2dev(chan), "%s: freeing channel #%u\n",
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__func__, ch->ch_num);
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ch->allocated = 0;
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}
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static void moxart_dma_set_params(struct moxart_chan *ch, dma_addr_t src_addr,
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dma_addr_t dst_addr)
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{
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writel(src_addr, ch->base + REG_OFF_ADDRESS_SOURCE);
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writel(dst_addr, ch->base + REG_OFF_ADDRESS_DEST);
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}
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static void moxart_set_transfer_params(struct moxart_chan *ch, unsigned int len)
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{
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struct moxart_desc *d = ch->desc;
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unsigned int sglen_div = es_bytes[d->es];
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d->dma_cycles = len >> sglen_div;
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/*
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* There are 4 cycles on 64 bytes copied, i.e. one cycle copies 16
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* bytes ( when width is APB_DMAB_DATA_WIDTH_4 ).
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*/
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writel(d->dma_cycles, ch->base + REG_OFF_CYCLES);
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dev_dbg(chan2dev(&ch->vc.chan), "%s: set %u DMA cycles (len=%u)\n",
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__func__, d->dma_cycles, len);
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}
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static void moxart_start_dma(struct moxart_chan *ch)
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{
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u32 ctrl;
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ctrl = readl(ch->base + REG_OFF_CTRL);
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ctrl |= (APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
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writel(ctrl, ch->base + REG_OFF_CTRL);
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}
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static void moxart_dma_start_sg(struct moxart_chan *ch, unsigned int idx)
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{
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struct moxart_desc *d = ch->desc;
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struct moxart_sg *sg = ch->desc->sg + idx;
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if (ch->desc->dma_dir == DMA_MEM_TO_DEV)
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moxart_dma_set_params(ch, sg->addr, d->dev_addr);
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else if (ch->desc->dma_dir == DMA_DEV_TO_MEM)
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moxart_dma_set_params(ch, d->dev_addr, sg->addr);
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moxart_set_transfer_params(ch, sg->len);
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moxart_start_dma(ch);
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}
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static void moxart_dma_start_desc(struct dma_chan *chan)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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struct virt_dma_desc *vd;
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vd = vchan_next_desc(&ch->vc);
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if (!vd) {
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ch->desc = NULL;
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return;
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}
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list_del(&vd->node);
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ch->desc = to_moxart_dma_desc(&vd->tx);
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ch->sgidx = 0;
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moxart_dma_start_sg(ch, 0);
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}
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static void moxart_issue_pending(struct dma_chan *chan)
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{
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struct moxart_chan *ch = to_moxart_dma_chan(chan);
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unsigned long flags;
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spin_lock_irqsave(&ch->vc.lock, flags);
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if (vchan_issue_pending(&ch->vc) && !ch->desc)
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moxart_dma_start_desc(chan);
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spin_unlock_irqrestore(&ch->vc.lock, flags);
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}
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static size_t moxart_dma_desc_size(struct moxart_desc *d,
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unsigned int completed_sgs)
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{
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unsigned int i;
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size_t size;
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for (size = i = completed_sgs; i < d->sglen; i++)
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size += d->sg[i].len;
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return size;
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}
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static size_t moxart_dma_desc_size_in_flight(struct moxart_chan *ch)
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{
|
|
size_t size;
|
|
unsigned int completed_cycles, cycles;
|
|
|
|
size = moxart_dma_desc_size(ch->desc, ch->sgidx);
|
|
cycles = readl(ch->base + REG_OFF_CYCLES);
|
|
completed_cycles = (ch->desc->dma_cycles - cycles);
|
|
size -= completed_cycles << es_bytes[ch->desc->es];
|
|
|
|
dev_dbg(chan2dev(&ch->vc.chan), "%s: size=%zu\n", __func__, size);
|
|
|
|
return size;
|
|
}
|
|
|
|
static enum dma_status moxart_tx_status(struct dma_chan *chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
struct moxart_chan *ch = to_moxart_dma_chan(chan);
|
|
struct virt_dma_desc *vd;
|
|
struct moxart_desc *d;
|
|
enum dma_status ret;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* dma_cookie_status() assigns initial residue value.
|
|
*/
|
|
ret = dma_cookie_status(chan, cookie, txstate);
|
|
|
|
spin_lock_irqsave(&ch->vc.lock, flags);
|
|
vd = vchan_find_desc(&ch->vc, cookie);
|
|
if (vd) {
|
|
d = to_moxart_dma_desc(&vd->tx);
|
|
txstate->residue = moxart_dma_desc_size(d, 0);
|
|
} else if (ch->desc && ch->desc->vd.tx.cookie == cookie) {
|
|
txstate->residue = moxart_dma_desc_size_in_flight(ch);
|
|
}
|
|
spin_unlock_irqrestore(&ch->vc.lock, flags);
|
|
|
|
if (ch->error)
|
|
return DMA_ERROR;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void moxart_dma_init(struct dma_device *dma, struct device *dev)
|
|
{
|
|
dma->device_prep_slave_sg = moxart_prep_slave_sg;
|
|
dma->device_alloc_chan_resources = moxart_alloc_chan_resources;
|
|
dma->device_free_chan_resources = moxart_free_chan_resources;
|
|
dma->device_issue_pending = moxart_issue_pending;
|
|
dma->device_tx_status = moxart_tx_status;
|
|
dma->device_config = moxart_slave_config;
|
|
dma->device_terminate_all = moxart_terminate_all;
|
|
dma->dev = dev;
|
|
|
|
INIT_LIST_HEAD(&dma->channels);
|
|
}
|
|
|
|
static irqreturn_t moxart_dma_interrupt(int irq, void *devid)
|
|
{
|
|
struct moxart_dmadev *mc = devid;
|
|
struct moxart_chan *ch = &mc->slave_chans[0];
|
|
unsigned int i;
|
|
unsigned long flags;
|
|
u32 ctrl;
|
|
|
|
dev_dbg(chan2dev(&ch->vc.chan), "%s\n", __func__);
|
|
|
|
for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
|
|
if (!ch->allocated)
|
|
continue;
|
|
|
|
ctrl = readl(ch->base + REG_OFF_CTRL);
|
|
|
|
dev_dbg(chan2dev(&ch->vc.chan), "%s: ch=%p ch->base=%p ctrl=%x\n",
|
|
__func__, ch, ch->base, ctrl);
|
|
|
|
if (ctrl & APB_DMA_FIN_INT_STS) {
|
|
ctrl &= ~APB_DMA_FIN_INT_STS;
|
|
if (ch->desc) {
|
|
spin_lock_irqsave(&ch->vc.lock, flags);
|
|
if (++ch->sgidx < ch->desc->sglen) {
|
|
moxart_dma_start_sg(ch, ch->sgidx);
|
|
} else {
|
|
vchan_cookie_complete(&ch->desc->vd);
|
|
moxart_dma_start_desc(&ch->vc.chan);
|
|
}
|
|
spin_unlock_irqrestore(&ch->vc.lock, flags);
|
|
}
|
|
}
|
|
|
|
if (ctrl & APB_DMA_ERR_INT_STS) {
|
|
ctrl &= ~APB_DMA_ERR_INT_STS;
|
|
ch->error = 1;
|
|
}
|
|
|
|
writel(ctrl, ch->base + REG_OFF_CTRL);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int moxart_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *node = dev->of_node;
|
|
struct resource *res;
|
|
static void __iomem *dma_base_addr;
|
|
int ret, i;
|
|
unsigned int irq;
|
|
struct moxart_chan *ch;
|
|
struct moxart_dmadev *mdc;
|
|
|
|
mdc = devm_kzalloc(dev, sizeof(*mdc), GFP_KERNEL);
|
|
if (!mdc)
|
|
return -ENOMEM;
|
|
|
|
irq = irq_of_parse_and_map(node, 0);
|
|
if (!irq) {
|
|
dev_err(dev, "no IRQ resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
dma_base_addr = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(dma_base_addr))
|
|
return PTR_ERR(dma_base_addr);
|
|
|
|
dma_cap_zero(mdc->dma_slave.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, mdc->dma_slave.cap_mask);
|
|
dma_cap_set(DMA_PRIVATE, mdc->dma_slave.cap_mask);
|
|
|
|
moxart_dma_init(&mdc->dma_slave, dev);
|
|
|
|
ch = &mdc->slave_chans[0];
|
|
for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
|
|
ch->ch_num = i;
|
|
ch->base = dma_base_addr + i * REG_OFF_CHAN_SIZE;
|
|
ch->allocated = 0;
|
|
|
|
ch->vc.desc_free = moxart_dma_desc_free;
|
|
vchan_init(&ch->vc, &mdc->dma_slave);
|
|
|
|
dev_dbg(dev, "%s: chs[%d]: ch->ch_num=%u ch->base=%p\n",
|
|
__func__, i, ch->ch_num, ch->base);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, mdc);
|
|
|
|
ret = devm_request_irq(dev, irq, moxart_dma_interrupt, 0,
|
|
"moxart-dma-engine", mdc);
|
|
if (ret) {
|
|
dev_err(dev, "devm_request_irq failed\n");
|
|
return ret;
|
|
}
|
|
mdc->irq = irq;
|
|
|
|
ret = dma_async_device_register(&mdc->dma_slave);
|
|
if (ret) {
|
|
dev_err(dev, "dma_async_device_register failed\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_dma_controller_register(node, moxart_of_xlate, mdc);
|
|
if (ret) {
|
|
dev_err(dev, "of_dma_controller_register failed\n");
|
|
dma_async_device_unregister(&mdc->dma_slave);
|
|
return ret;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: IRQ=%u\n", __func__, irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moxart_remove(struct platform_device *pdev)
|
|
{
|
|
struct moxart_dmadev *m = platform_get_drvdata(pdev);
|
|
|
|
devm_free_irq(&pdev->dev, m->irq, m);
|
|
|
|
dma_async_device_unregister(&m->dma_slave);
|
|
|
|
if (pdev->dev.of_node)
|
|
of_dma_controller_free(pdev->dev.of_node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id moxart_dma_match[] = {
|
|
{ .compatible = "moxa,moxart-dma" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, moxart_dma_match);
|
|
|
|
static struct platform_driver moxart_driver = {
|
|
.probe = moxart_probe,
|
|
.remove = moxart_remove,
|
|
.driver = {
|
|
.name = "moxart-dma-engine",
|
|
.of_match_table = moxart_dma_match,
|
|
},
|
|
};
|
|
|
|
static int moxart_init(void)
|
|
{
|
|
return platform_driver_register(&moxart_driver);
|
|
}
|
|
subsys_initcall(moxart_init);
|
|
|
|
static void __exit moxart_exit(void)
|
|
{
|
|
platform_driver_unregister(&moxart_driver);
|
|
}
|
|
module_exit(moxart_exit);
|
|
|
|
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
|
|
MODULE_DESCRIPTION("MOXART DMA engine driver");
|
|
MODULE_LICENSE("GPL v2");
|