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sun6i-dma.c
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sun6i-dma.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
* Author: Sugar <[email protected]>
*
* Copyright (C) 2014 Maxime Ripard
* Maxime Ripard <[email protected]>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "virt-dma.h"
/*
* Common registers
*/
#define DMA_IRQ_EN(x) ((x) * 0x04)
#define DMA_IRQ_HALF BIT(0)
#define DMA_IRQ_PKG BIT(1)
#define DMA_IRQ_QUEUE BIT(2)
#define DMA_IRQ_CHAN_NR 8
#define DMA_IRQ_CHAN_WIDTH 4
#define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10)
#define DMA_STAT 0x30
/* Offset between DMA_IRQ_EN and DMA_IRQ_STAT limits number of channels */
#define DMA_MAX_CHANNELS (DMA_IRQ_CHAN_NR * 0x10 / 4)
/*
* sun8i specific registers
*/
#define SUN8I_DMA_GATE 0x20
#define SUN8I_DMA_GATE_ENABLE 0x4
#define SUNXI_H3_SECURE_REG 0x20
#define SUNXI_H3_DMA_GATE 0x28
#define SUNXI_H3_DMA_GATE_ENABLE 0x4
/*
* Channels specific registers
*/
#define DMA_CHAN_ENABLE 0x00
#define DMA_CHAN_ENABLE_START BIT(0)
#define DMA_CHAN_ENABLE_STOP 0
#define DMA_CHAN_PAUSE 0x04
#define DMA_CHAN_PAUSE_PAUSE BIT(1)
#define DMA_CHAN_PAUSE_RESUME 0
#define DMA_CHAN_LLI_ADDR 0x08
#define DMA_CHAN_CUR_CFG 0x0c
#define DMA_CHAN_MAX_DRQ 0x1f
#define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & DMA_CHAN_MAX_DRQ)
#define DMA_CHAN_CFG_SRC_IO_MODE BIT(5)
#define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5)
#define DMA_CHAN_CFG_SRC_BURST_A31(x) (((x) & 0x3) << 7)
#define DMA_CHAN_CFG_SRC_BURST_H3(x) (((x) & 0x3) << 6)
#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
#define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16)
#define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16)
#define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16)
#define DMA_CHAN_CFG_DST_BURST_A31(x) (DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
#define DMA_CHAN_CFG_DST_BURST_H3(x) (DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
#define DMA_CHAN_CUR_SRC 0x10
#define DMA_CHAN_CUR_DST 0x14
#define DMA_CHAN_CUR_CNT 0x18
#define DMA_CHAN_CUR_PARA 0x1c
/*
* Various hardware related defines
*/
#define LLI_LAST_ITEM 0xfffff800
#define NORMAL_WAIT 8
#define DRQ_SDRAM 1
/* forward declaration */
struct sun6i_dma_dev;
/*
* Hardware channels / ports representation
*
* The hardware is used in several SoCs, with differing numbers
* of channels and endpoints. This structure ties those numbers
* to a certain compatible string.
*/
struct sun6i_dma_config {
u32 nr_max_channels;
u32 nr_max_requests;
u32 nr_max_vchans;
/*
* In the datasheets/user manuals of newer Allwinner SoCs, a special
* bit (bit 2 at register 0x20) is present.
* It's named "DMA MCLK interface circuit auto gating bit" in the
* documents, and the footnote of this register says that this bit
* should be set up when initializing the DMA controller.
* Allwinner A23/A33 user manuals do not have this bit documented,
* however these SoCs really have and need this bit, as seen in the
* BSP kernel source code.
*/
void (*clock_autogate_enable)(struct sun6i_dma_dev *);
void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
u32 src_burst_lengths;
u32 dst_burst_lengths;
u32 src_addr_widths;
u32 dst_addr_widths;
};
/*
* Hardware representation of the LLI
*
* The hardware will be fed the physical address of this structure,
* and read its content in order to start the transfer.
*/
struct sun6i_dma_lli {
u32 cfg;
u32 src;
u32 dst;
u32 len;
u32 para;
u32 p_lli_next;
/*
* This field is not used by the DMA controller, but will be
* used by the CPU to go through the list (mostly for dumping
* or freeing it).
*/
struct sun6i_dma_lli *v_lli_next;
};
struct sun6i_desc {
struct virt_dma_desc vd;
dma_addr_t p_lli;
struct sun6i_dma_lli *v_lli;
};
struct sun6i_pchan {
u32 idx;
void __iomem *base;
struct sun6i_vchan *vchan;
struct sun6i_desc *desc;
struct sun6i_desc *done;
};
struct sun6i_vchan {
struct virt_dma_chan vc;
struct list_head node;
struct dma_slave_config cfg;
struct sun6i_pchan *phy;
u8 port;
u8 irq_type;
bool cyclic;
};
struct sun6i_dma_dev {
struct dma_device slave;
void __iomem *base;
struct clk *clk;
int irq;
spinlock_t lock;
struct reset_control *rstc;
struct tasklet_struct task;
atomic_t tasklet_shutdown;
struct list_head pending;
struct dma_pool *pool;
struct sun6i_pchan *pchans;
struct sun6i_vchan *vchans;
const struct sun6i_dma_config *cfg;
u32 num_pchans;
u32 num_vchans;
u32 max_request;
};
static struct device *chan2dev(struct dma_chan *chan)
{
return &chan->dev->device;
}
static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d)
{
return container_of(d, struct sun6i_dma_dev, slave);
}
static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan)
{
return container_of(chan, struct sun6i_vchan, vc.chan);
}
static inline struct sun6i_desc *
to_sun6i_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct sun6i_desc, vd.tx);
}
static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev)
{
dev_dbg(sdev->slave.dev, "Common register:\n"
"\tmask0(%04x): 0x%08x\n"
"\tmask1(%04x): 0x%08x\n"
"\tpend0(%04x): 0x%08x\n"
"\tpend1(%04x): 0x%08x\n"
"\tstats(%04x): 0x%08x\n",
DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)),
DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)),
DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)),
DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)),
DMA_STAT, readl(sdev->base + DMA_STAT));
}
static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
struct sun6i_pchan *pchan)
{
phys_addr_t reg = virt_to_phys(pchan->base);
dev_dbg(sdev->slave.dev, "Chan %d reg: %pa\n"
"\t___en(%04x): \t0x%08x\n"
"\tpause(%04x): \t0x%08x\n"
"\tstart(%04x): \t0x%08x\n"
"\t__cfg(%04x): \t0x%08x\n"
"\t__src(%04x): \t0x%08x\n"
"\t__dst(%04x): \t0x%08x\n"
"\tcount(%04x): \t0x%08x\n"
"\t_para(%04x): \t0x%08x\n\n",
pchan->idx, ®,
DMA_CHAN_ENABLE,
readl(pchan->base + DMA_CHAN_ENABLE),
DMA_CHAN_PAUSE,
readl(pchan->base + DMA_CHAN_PAUSE),
DMA_CHAN_LLI_ADDR,
readl(pchan->base + DMA_CHAN_LLI_ADDR),
DMA_CHAN_CUR_CFG,
readl(pchan->base + DMA_CHAN_CUR_CFG),
DMA_CHAN_CUR_SRC,
readl(pchan->base + DMA_CHAN_CUR_SRC),
DMA_CHAN_CUR_DST,
readl(pchan->base + DMA_CHAN_CUR_DST),
DMA_CHAN_CUR_CNT,
readl(pchan->base + DMA_CHAN_CUR_CNT),
DMA_CHAN_CUR_PARA,
readl(pchan->base + DMA_CHAN_CUR_PARA));
}
static inline s8 convert_burst(u32 maxburst)
{
switch (maxburst) {
case 1:
return 0;
case 4:
return 1;
case 8:
return 2;
case 16:
return 3;
default:
return -EINVAL;
}
}
static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
{
return ilog2(addr_width);
}
static void sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev *sdev)
{
writel(SUN8I_DMA_GATE_ENABLE, sdev->base + SUN8I_DMA_GATE);
}
static void sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev *sdev)
{
writel(SUNXI_H3_DMA_GATE_ENABLE, sdev->base + SUNXI_H3_DMA_GATE);
}
static void sun6i_set_burst_length_a31(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_A31(src_burst) |
DMA_CHAN_CFG_DST_BURST_A31(dst_burst);
}
static void sun6i_set_burst_length_h3(u32 *p_cfg, s8 src_burst, s8 dst_burst)
{
*p_cfg |= DMA_CHAN_CFG_SRC_BURST_H3(src_burst) |
DMA_CHAN_CFG_DST_BURST_H3(dst_burst);
}
static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
{
struct sun6i_desc *txd = pchan->desc;
struct sun6i_dma_lli *lli;
size_t bytes;
dma_addr_t pos;
pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
if (pos == LLI_LAST_ITEM)
return bytes;
for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
if (lli->p_lli_next == pos) {
for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
bytes += lli->len;
break;
}
}
return bytes;
}
static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
struct sun6i_dma_lli *next,
dma_addr_t next_phy,
struct sun6i_desc *txd)
{
if ((!prev && !txd) || !next)
return NULL;
if (!prev) {
txd->p_lli = next_phy;
txd->v_lli = next;
} else {
prev->p_lli_next = next_phy;
prev->v_lli_next = next;
}
next->p_lli_next = LLI_LAST_ITEM;
next->v_lli_next = NULL;
return next;
}
static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
struct sun6i_dma_lli *lli)
{
phys_addr_t p_lli = virt_to_phys(lli);
dev_dbg(chan2dev(&vchan->vc.chan),
"\n\tdesc: p - %pa v - 0x%p\n"
"\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
"\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
&p_lli, lli,
lli->cfg, lli->src, lli->dst,
lli->len, lli->para, lli->p_lli_next);
}
static void sun6i_dma_free_desc(struct virt_dma_desc *vd)
{
struct sun6i_desc *txd = to_sun6i_desc(&vd->tx);
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device);
struct sun6i_dma_lli *v_lli, *v_next;
dma_addr_t p_lli, p_next;
if (unlikely(!txd))
return;
p_lli = txd->p_lli;
v_lli = txd->v_lli;
while (v_lli) {
v_next = v_lli->v_lli_next;
p_next = v_lli->p_lli_next;
dma_pool_free(sdev->pool, v_lli, p_lli);
v_lli = v_next;
p_lli = p_next;
}
kfree(txd);
}
static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc);
struct sun6i_pchan *pchan = vchan->phy;
u32 irq_val, irq_reg, irq_offset;
if (!pchan)
return -EAGAIN;
if (!desc) {
pchan->desc = NULL;
pchan->done = NULL;
return -EAGAIN;
}
list_del(&desc->node);
pchan->desc = to_sun6i_desc(&desc->tx);
pchan->done = NULL;
sun6i_dma_dump_lli(vchan, pchan->desc->v_lli);
irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
(irq_offset * DMA_IRQ_CHAN_WIDTH));
irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
sun6i_dma_dump_com_regs(sdev);
sun6i_dma_dump_chan_regs(sdev, pchan);
return 0;
}
static void sun6i_dma_tasklet(unsigned long data)
{
struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
unsigned int pchan_alloc = 0;
unsigned int pchan_idx;
list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) {
spin_lock_irq(&vchan->vc.lock);
pchan = vchan->phy;
if (pchan && pchan->done) {
if (sun6i_dma_start_desc(vchan)) {
/*
* No current txd associated with this channel
*/
dev_dbg(sdev->slave.dev, "pchan %u: free\n",
pchan->idx);
/* Mark this channel free */
vchan->phy = NULL;
pchan->vchan = NULL;
}
}
spin_unlock_irq(&vchan->vc.lock);
}
spin_lock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
pchan = &sdev->pchans[pchan_idx];
if (pchan->vchan || list_empty(&sdev->pending))
continue;
vchan = list_first_entry(&sdev->pending,
struct sun6i_vchan, node);
/* Remove from pending channels */
list_del_init(&vchan->node);
pchan_alloc |= BIT(pchan_idx);
/* Mark this channel allocated */
pchan->vchan = vchan;
vchan->phy = pchan;
dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n",
pchan->idx, &vchan->vc);
}
spin_unlock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
if (!(pchan_alloc & BIT(pchan_idx)))
continue;
pchan = sdev->pchans + pchan_idx;
vchan = pchan->vchan;
if (vchan) {
spin_lock_irq(&vchan->vc.lock);
sun6i_dma_start_desc(vchan);
spin_unlock_irq(&vchan->vc.lock);
}
}
}
static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
{
struct sun6i_dma_dev *sdev = dev_id;
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
int i, j, ret = IRQ_NONE;
u32 status;
for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
status = readl(sdev->base + DMA_IRQ_STAT(i));
if (!status)
continue;
dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
i ? "high" : "low", status);
writel(status, sdev->base + DMA_IRQ_STAT(i));
for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
pchan = sdev->pchans + j;
vchan = pchan->vchan;
if (vchan && (status & vchan->irq_type)) {
if (vchan->cyclic) {
vchan_cyclic_callback(&pchan->desc->vd);
} else {
spin_lock(&vchan->vc.lock);
vchan_cookie_complete(&pchan->desc->vd);
pchan->done = pchan->desc;
spin_unlock(&vchan->vc.lock);
}
}
status = status >> DMA_IRQ_CHAN_WIDTH;
}
if (!atomic_read(&sdev->tasklet_shutdown))
tasklet_schedule(&sdev->task);
ret = IRQ_HANDLED;
}
return ret;
}
static int set_config(struct sun6i_dma_dev *sdev,
struct dma_slave_config *sconfig,
enum dma_transfer_direction direction,
u32 *p_cfg)
{
enum dma_slave_buswidth src_addr_width, dst_addr_width;
u32 src_maxburst, dst_maxburst;
s8 src_width, dst_width, src_burst, dst_burst;
src_addr_width = sconfig->src_addr_width;
dst_addr_width = sconfig->dst_addr_width;
src_maxburst = sconfig->src_maxburst;
dst_maxburst = sconfig->dst_maxburst;
switch (direction) {
case DMA_MEM_TO_DEV:
if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
src_maxburst = src_maxburst ? src_maxburst : 8;
break;
case DMA_DEV_TO_MEM:
if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dst_maxburst = dst_maxburst ? dst_maxburst : 8;
break;
default:
return -EINVAL;
}
if (!(BIT(src_addr_width) & sdev->slave.src_addr_widths))
return -EINVAL;
if (!(BIT(dst_addr_width) & sdev->slave.dst_addr_widths))
return -EINVAL;
if (!(BIT(src_maxburst) & sdev->cfg->src_burst_lengths))
return -EINVAL;
if (!(BIT(dst_maxburst) & sdev->cfg->dst_burst_lengths))
return -EINVAL;
src_width = convert_buswidth(src_addr_width);
dst_width = convert_buswidth(dst_addr_width);
dst_burst = convert_burst(dst_maxburst);
src_burst = convert_burst(src_maxburst);
*p_cfg = DMA_CHAN_CFG_SRC_WIDTH(src_width) |
DMA_CHAN_CFG_DST_WIDTH(dst_width);
sdev->cfg->set_burst_length(p_cfg, src_burst, dst_burst);
return 0;
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_dma_lli *v_lli;
struct sun6i_desc *txd;
dma_addr_t p_lli;
s8 burst, width;
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id, &dest, &src, len, flags);
if (!len)
return NULL;
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
if (!v_lli) {
dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
goto err_txd_free;
}
v_lli->src = src;
v_lli->dst = dest;
v_lli->len = len;
v_lli->para = NORMAL_WAIT;
burst = convert_burst(8);
width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
v_lli->cfg = DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_WIDTH(width) |
DMA_CHAN_CFG_DST_WIDTH(width);
sdev->cfg->set_burst_length(&v_lli->cfg, burst, burst);
sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
sun6i_dma_dump_lli(vchan, v_lli);
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_txd_free:
kfree(txd);
return NULL;
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction dir,
unsigned long flags, void *context)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun6i_dma_lli *v_lli, *prev = NULL;
struct sun6i_desc *txd;
struct scatterlist *sg;
dma_addr_t p_lli;
u32 lli_cfg;
int i, ret;
if (!sgl)
return NULL;
ret = set_config(sdev, sconfig, dir, &lli_cfg);
if (ret) {
dev_err(chan2dev(chan), "Invalid DMA configuration\n");
return NULL;
}
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
for_each_sg(sgl, sg, sg_len, i) {
v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
if (!v_lli)
goto err_lli_free;
v_lli->len = sg_dma_len(sg);
v_lli->para = NORMAL_WAIT;
if (dir == DMA_MEM_TO_DEV) {
v_lli->src = sg_dma_address(sg);
v_lli->dst = sconfig->dst_addr;
v_lli->cfg = lli_cfg |
DMA_CHAN_CFG_DST_IO_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_DRQ(vchan->port);
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id,
&sconfig->dst_addr, &sg_dma_address(sg),
sg_dma_len(sg), flags);
} else {
v_lli->src = sconfig->src_addr;
v_lli->dst = sg_dma_address(sg);
v_lli->cfg = lli_cfg |
DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_IO_MODE |
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_SRC_DRQ(vchan->port);
dev_dbg(chan2dev(chan),
"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
__func__, vchan->vc.chan.chan_id,
&sg_dma_address(sg), &sconfig->src_addr,
sg_dma_len(sg), flags);
}
prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
}
dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli);
for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
sun6i_dma_dump_lli(vchan, prev);
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_lli_free:
for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
kfree(txd);
return NULL;
}
static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
struct dma_chan *chan,
dma_addr_t buf_addr,
size_t buf_len,
size_t period_len,
enum dma_transfer_direction dir,
unsigned long flags)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct dma_slave_config *sconfig = &vchan->cfg;
struct sun6i_dma_lli *v_lli, *prev = NULL;
struct sun6i_desc *txd;
dma_addr_t p_lli;
u32 lli_cfg;
unsigned int i, periods = buf_len / period_len;
int ret;
ret = set_config(sdev, sconfig, dir, &lli_cfg);
if (ret) {
dev_err(chan2dev(chan), "Invalid DMA configuration\n");
return NULL;
}
txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
if (!txd)
return NULL;
for (i = 0; i < periods; i++) {
v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
if (!v_lli) {
dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
goto err_lli_free;
}
v_lli->len = period_len;
v_lli->para = NORMAL_WAIT;
if (dir == DMA_MEM_TO_DEV) {
v_lli->src = buf_addr + period_len * i;
v_lli->dst = sconfig->dst_addr;
v_lli->cfg = lli_cfg |
DMA_CHAN_CFG_DST_IO_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_DRQ(vchan->port);
} else {
v_lli->src = sconfig->src_addr;
v_lli->dst = buf_addr + period_len * i;
v_lli->cfg = lli_cfg |
DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_IO_MODE |
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_SRC_DRQ(vchan->port);
}
prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
}
prev->p_lli_next = txd->p_lli; /* cyclic list */
vchan->cyclic = true;
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_lli_free:
for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
kfree(txd);
return NULL;
}
static int sun6i_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
memcpy(&vchan->cfg, config, sizeof(*config));
return 0;
}
static int sun6i_dma_pause(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc);
if (pchan) {
writel(DMA_CHAN_PAUSE_PAUSE,
pchan->base + DMA_CHAN_PAUSE);
} else {
spin_lock(&sdev->lock);
list_del_init(&vchan->node);
spin_unlock(&sdev->lock);
}
return 0;
}
static int sun6i_dma_resume(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
unsigned long flags;
dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
spin_lock_irqsave(&vchan->vc.lock, flags);
if (pchan) {
writel(DMA_CHAN_PAUSE_RESUME,
pchan->base + DMA_CHAN_PAUSE);
} else if (!list_empty(&vchan->vc.desc_issued)) {
spin_lock(&sdev->lock);
list_add_tail(&vchan->node, &sdev->pending);
spin_unlock(&sdev->lock);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
return 0;
}
static int sun6i_dma_terminate_all(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
unsigned long flags;
LIST_HEAD(head);
spin_lock(&sdev->lock);
list_del_init(&vchan->node);
spin_unlock(&sdev->lock);
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan->cyclic) {
vchan->cyclic = false;
if (pchan && pchan->desc) {
struct virt_dma_desc *vd = &pchan->desc->vd;
struct virt_dma_chan *vc = &vchan->vc;
list_add_tail(&vd->node, &vc->desc_completed);
}
}
vchan_get_all_descriptors(&vchan->vc, &head);
if (pchan) {
writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
vchan->phy = NULL;
pchan->vchan = NULL;
pchan->desc = NULL;
pchan->done = NULL;
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
vchan_dma_desc_free_list(&vchan->vc, &head);
return 0;
}
static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
struct sun6i_pchan *pchan = vchan->phy;
struct sun6i_dma_lli *lli;
struct virt_dma_desc *vd;
struct sun6i_desc *txd;
enum dma_status ret;
unsigned long flags;
size_t bytes = 0;
ret = dma_cookie_status(chan, cookie, state);
if (ret == DMA_COMPLETE || !state)
return ret;
spin_lock_irqsave(&vchan->vc.lock, flags);
vd = vchan_find_desc(&vchan->vc, cookie);
txd = to_sun6i_desc(&vd->tx);
if (vd) {
for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next)
bytes += lli->len;
} else if (!pchan || !pchan->desc) {
bytes = 0;
} else {
bytes = sun6i_get_chan_size(pchan);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
dma_set_residue(state, bytes);
return ret;
}
static void sun6i_dma_issue_pending(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&vchan->vc.lock, flags);
if (vchan_issue_pending(&vchan->vc)) {
spin_lock(&sdev->lock);
if (!vchan->phy && list_empty(&vchan->node)) {
list_add_tail(&vchan->node, &sdev->pending);
tasklet_schedule(&sdev->task);
dev_dbg(chan2dev(chan), "vchan %p: issued\n",
&vchan->vc);
}
spin_unlock(&sdev->lock);
} else {
dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n",
&vchan->vc);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
}
static void sun6i_dma_free_chan_resources(struct dma_chan *chan)
{
struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
unsigned long flags;
spin_lock_irqsave(&sdev->lock, flags);
list_del_init(&vchan->node);
spin_unlock_irqrestore(&sdev->lock, flags);
vchan_free_chan_resources(&vchan->vc);
}
static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct sun6i_dma_dev *sdev = ofdma->of_dma_data;
struct sun6i_vchan *vchan;
struct dma_chan *chan;
u8 port = dma_spec->args[0];
if (port > sdev->max_request)
return NULL;
chan = dma_get_any_slave_channel(&sdev->slave);
if (!chan)
return NULL;
vchan = to_sun6i_vchan(chan);
vchan->port = port;
return chan;