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dmaengine: Add Arm DMA-350 driver 

Add an initial driver for the Arm Corelink DMA-350 controller, to
support basic mem-to-mem async_tx. The design here leaves room for more
fun things like peripheral support and scatter-gather chaining to come
in future.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/6d7d8efefa935d34977b59a74797ab377528db94.1741780808.git.robin.murphy@arm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
pull/1257/head
Robin Murphy 2025-03-12 12:05:10 +00:00 committed by Vinod Koul
parent c4771efa84
commit 5d09970644
3 changed files with 668 additions and 0 deletions
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7
drivers/dma/Kconfig
View File

@ -93,6 +93,13 @@ config APPLE_ADMAC
help
Enable support for Audio DMA Controller found on Apple Silicon SoCs.
config ARM_DMA350
tristate "Arm DMA-350 support"
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
help
Enable support for the Arm DMA-350 controller.
config AT_HDMAC
tristate "Atmel AHB DMA support"
depends on ARCH_AT91

1
drivers/dma/Makefile
View File

@ -17,6 +17,7 @@ obj-$(CONFIG_ALTERA_MSGDMA) += altera-msgdma.o
obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/
obj-$(CONFIG_APPLE_ADMAC) += apple-admac.o
obj-$(CONFIG_ARM_DMA350) += arm-dma350.o
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_AT_XDMAC) += at_xdmac.o
obj-$(CONFIG_AXI_DMAC) += dma-axi-dmac.o

660
drivers/dma/arm-dma350.c Normal file
View File

@ -0,0 +1,660 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024-2025 Arm Limited
// Arm DMA-350 driver
#include <linux/bitfield.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include "dmaengine.h"
#include "virt-dma.h"
#define DMAINFO 0x0f00
#define DMA_BUILDCFG0 0xb0
#define DMA_CFG_DATA_WIDTH GENMASK(18, 16)
#define DMA_CFG_ADDR_WIDTH GENMASK(15, 10)
#define DMA_CFG_NUM_CHANNELS GENMASK(9, 4)
#define DMA_BUILDCFG1 0xb4
#define DMA_CFG_NUM_TRIGGER_IN GENMASK(8, 0)
#define IIDR 0xc8
#define IIDR_PRODUCTID GENMASK(31, 20)
#define IIDR_VARIANT GENMASK(19, 16)
#define IIDR_REVISION GENMASK(15, 12)
#define IIDR_IMPLEMENTER GENMASK(11, 0)
#define PRODUCTID_DMA350 0x3a0
#define IMPLEMENTER_ARM 0x43b
#define DMACH(n) (0x1000 + 0x0100 * (n))
#define CH_CMD 0x00
#define CH_CMD_RESUME BIT(5)
#define CH_CMD_PAUSE BIT(4)
#define CH_CMD_STOP BIT(3)
#define CH_CMD_DISABLE BIT(2)
#define CH_CMD_CLEAR BIT(1)
#define CH_CMD_ENABLE BIT(0)
#define CH_STATUS 0x04
#define CH_STAT_RESUMEWAIT BIT(21)
#define CH_STAT_PAUSED BIT(20)
#define CH_STAT_STOPPED BIT(19)
#define CH_STAT_DISABLED BIT(18)
#define CH_STAT_ERR BIT(17)
#define CH_STAT_DONE BIT(16)
#define CH_STAT_INTR_ERR BIT(1)
#define CH_STAT_INTR_DONE BIT(0)
#define CH_INTREN 0x08
#define CH_INTREN_ERR BIT(1)
#define CH_INTREN_DONE BIT(0)
#define CH_CTRL 0x0c
#define CH_CTRL_USEDESTRIGIN BIT(26)
#define CH_CTRL_USESRCTRIGIN BIT(26)
#define CH_CTRL_DONETYPE GENMASK(23, 21)
#define CH_CTRL_REGRELOADTYPE GENMASK(20, 18)
#define CH_CTRL_XTYPE GENMASK(11, 9)
#define CH_CTRL_TRANSIZE GENMASK(2, 0)
#define CH_SRCADDR 0x10
#define CH_SRCADDRHI 0x14
#define CH_DESADDR 0x18
#define CH_DESADDRHI 0x1c
#define CH_XSIZE 0x20
#define CH_XSIZEHI 0x24
#define CH_SRCTRANSCFG 0x28
#define CH_DESTRANSCFG 0x2c
#define CH_CFG_MAXBURSTLEN GENMASK(19, 16)
#define CH_CFG_PRIVATTR BIT(11)
#define CH_CFG_SHAREATTR GENMASK(9, 8)
#define CH_CFG_MEMATTR GENMASK(7, 0)
#define TRANSCFG_DEVICE \
FIELD_PREP(CH_CFG_MAXBURSTLEN, 0xf) | \
FIELD_PREP(CH_CFG_SHAREATTR, SHAREATTR_OSH) | \
FIELD_PREP(CH_CFG_MEMATTR, MEMATTR_DEVICE)
#define TRANSCFG_NC \
FIELD_PREP(CH_CFG_MAXBURSTLEN, 0xf) | \
FIELD_PREP(CH_CFG_SHAREATTR, SHAREATTR_OSH) | \
FIELD_PREP(CH_CFG_MEMATTR, MEMATTR_NC)
#define TRANSCFG_WB \
FIELD_PREP(CH_CFG_MAXBURSTLEN, 0xf) | \
FIELD_PREP(CH_CFG_SHAREATTR, SHAREATTR_ISH) | \
FIELD_PREP(CH_CFG_MEMATTR, MEMATTR_WB)
#define CH_XADDRINC 0x30
#define CH_XY_DES GENMASK(31, 16)
#define CH_XY_SRC GENMASK(15, 0)
#define CH_FILLVAL 0x38
#define CH_SRCTRIGINCFG 0x4c
#define CH_DESTRIGINCFG 0x50
#define CH_LINKATTR 0x70
#define CH_LINK_SHAREATTR GENMASK(9, 8)
#define CH_LINK_MEMATTR GENMASK(7, 0)
#define CH_AUTOCFG 0x74
#define CH_LINKADDR 0x78
#define CH_LINKADDR_EN BIT(0)
#define CH_LINKADDRHI 0x7c
#define CH_ERRINFO 0x90
#define CH_ERRINFO_AXIRDPOISERR BIT(18)
#define CH_ERRINFO_AXIWRRESPERR BIT(17)
#define CH_ERRINFO_AXIRDRESPERR BIT(16)
#define CH_BUILDCFG0 0xf8
#define CH_CFG_INC_WIDTH GENMASK(29, 26)
#define CH_CFG_DATA_WIDTH GENMASK(24, 22)
#define CH_CFG_DATA_BUF_SIZE GENMASK(7, 0)
#define CH_BUILDCFG1 0xfc
#define CH_CFG_HAS_CMDLINK BIT(8)
#define CH_CFG_HAS_TRIGSEL BIT(7)
#define CH_CFG_HAS_TRIGIN BIT(5)
#define CH_CFG_HAS_WRAP BIT(1)
#define LINK_REGCLEAR BIT(0)
#define LINK_INTREN BIT(2)
#define LINK_CTRL BIT(3)
#define LINK_SRCADDR BIT(4)
#define LINK_SRCADDRHI BIT(5)
#define LINK_DESADDR BIT(6)
#define LINK_DESADDRHI BIT(7)
#define LINK_XSIZE BIT(8)
#define LINK_XSIZEHI BIT(9)
#define LINK_SRCTRANSCFG BIT(10)
#define LINK_DESTRANSCFG BIT(11)
#define LINK_XADDRINC BIT(12)
#define LINK_FILLVAL BIT(14)
#define LINK_SRCTRIGINCFG BIT(19)
#define LINK_DESTRIGINCFG BIT(20)
#define LINK_AUTOCFG BIT(29)
#define LINK_LINKADDR BIT(30)
#define LINK_LINKADDRHI BIT(31)
enum ch_ctrl_donetype {
CH_CTRL_DONETYPE_NONE = 0,
CH_CTRL_DONETYPE_CMD = 1,
CH_CTRL_DONETYPE_CYCLE = 3
};
enum ch_ctrl_xtype {
CH_CTRL_XTYPE_DISABLE = 0,
CH_CTRL_XTYPE_CONTINUE = 1,
CH_CTRL_XTYPE_WRAP = 2,
CH_CTRL_XTYPE_FILL = 3
};
enum ch_cfg_shareattr {
SHAREATTR_NSH = 0,
SHAREATTR_OSH = 2,
SHAREATTR_ISH = 3
};
enum ch_cfg_memattr {
MEMATTR_DEVICE = 0x00,
MEMATTR_NC = 0x44,
MEMATTR_WB = 0xff
};
struct d350_desc {
struct virt_dma_desc vd;
u32 command[16];
u16 xsize;
u16 xsizehi;
u8 tsz;
};
struct d350_chan {
struct virt_dma_chan vc;
struct d350_desc *desc;
void __iomem *base;
int irq;
enum dma_status status;
dma_cookie_t cookie;
u32 residue;
u8 tsz;
bool has_trig;
bool has_wrap;
bool coherent;
};
struct d350 {
struct dma_device dma;
int nchan;
int nreq;
struct d350_chan channels[] __counted_by(nchan);
};
static inline struct d350_chan *to_d350_chan(struct dma_chan *chan)
{
return container_of(chan, struct d350_chan, vc.chan);
}
static inline struct d350_desc *to_d350_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct d350_desc, vd);
}
static void d350_desc_free(struct virt_dma_desc *vd)
{
kfree(to_d350_desc(vd));
}
static struct dma_async_tx_descriptor *d350_prep_memcpy(struct dma_chan *chan,
dma_addr_t dest, dma_addr_t src, size_t len, unsigned long flags)
{
struct d350_chan *dch = to_d350_chan(chan);
struct d350_desc *desc;
u32 *cmd;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->tsz = __ffs(len | dest | src | (1 << dch->tsz));
desc->xsize = lower_16_bits(len >> desc->tsz);
desc->xsizehi = upper_16_bits(len >> desc->tsz);
cmd = desc->command;
cmd[0] = LINK_CTRL | LINK_SRCADDR | LINK_SRCADDRHI | LINK_DESADDR |
LINK_DESADDRHI | LINK_XSIZE | LINK_XSIZEHI | LINK_SRCTRANSCFG |
LINK_DESTRANSCFG | LINK_XADDRINC | LINK_LINKADDR;
cmd[1] = FIELD_PREP(CH_CTRL_TRANSIZE, desc->tsz) |
FIELD_PREP(CH_CTRL_XTYPE, CH_CTRL_XTYPE_CONTINUE) |
FIELD_PREP(CH_CTRL_DONETYPE, CH_CTRL_DONETYPE_CMD);
cmd[2] = lower_32_bits(src);
cmd[3] = upper_32_bits(src);
cmd[4] = lower_32_bits(dest);
cmd[5] = upper_32_bits(dest);
cmd[6] = FIELD_PREP(CH_XY_SRC, desc->xsize) | FIELD_PREP(CH_XY_DES, desc->xsize);
cmd[7] = FIELD_PREP(CH_XY_SRC, desc->xsizehi) | FIELD_PREP(CH_XY_DES, desc->xsizehi);
cmd[8] = dch->coherent ? TRANSCFG_WB : TRANSCFG_NC;
cmd[9] = dch->coherent ? TRANSCFG_WB : TRANSCFG_NC;
cmd[10] = FIELD_PREP(CH_XY_SRC, 1) | FIELD_PREP(CH_XY_DES, 1);
cmd[11] = 0;
return vchan_tx_prep(&dch->vc, &desc->vd, flags);
}
static struct dma_async_tx_descriptor *d350_prep_memset(struct dma_chan *chan,
dma_addr_t dest, int value, size_t len, unsigned long flags)
{
struct d350_chan *dch = to_d350_chan(chan);
struct d350_desc *desc;
u32 *cmd;
desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
if (!desc)
return NULL;
desc->tsz = __ffs(len | dest | (1 << dch->tsz));
desc->xsize = lower_16_bits(len >> desc->tsz);
desc->xsizehi = upper_16_bits(len >> desc->tsz);
cmd = desc->command;
cmd[0] = LINK_CTRL | LINK_DESADDR | LINK_DESADDRHI |
LINK_XSIZE | LINK_XSIZEHI | LINK_DESTRANSCFG |
LINK_XADDRINC | LINK_FILLVAL | LINK_LINKADDR;
cmd[1] = FIELD_PREP(CH_CTRL_TRANSIZE, desc->tsz) |
FIELD_PREP(CH_CTRL_XTYPE, CH_CTRL_XTYPE_FILL) |
FIELD_PREP(CH_CTRL_DONETYPE, CH_CTRL_DONETYPE_CMD);
cmd[2] = lower_32_bits(dest);
cmd[3] = upper_32_bits(dest);
cmd[4] = FIELD_PREP(CH_XY_DES, desc->xsize);
cmd[5] = FIELD_PREP(CH_XY_DES, desc->xsizehi);
cmd[6] = dch->coherent ? TRANSCFG_WB : TRANSCFG_NC;
cmd[7] = FIELD_PREP(CH_XY_DES, 1);
cmd[8] = (u8)value * 0x01010101;
cmd[9] = 0;
return vchan_tx_prep(&dch->vc, &desc->vd, flags);
}
static int d350_pause(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
unsigned long flags;
spin_lock_irqsave(&dch->vc.lock, flags);
if (dch->status == DMA_IN_PROGRESS) {
writel_relaxed(CH_CMD_PAUSE, dch->base + CH_CMD);
dch->status = DMA_PAUSED;
}
spin_unlock_irqrestore(&dch->vc.lock, flags);
return 0;
}
static int d350_resume(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
unsigned long flags;
spin_lock_irqsave(&dch->vc.lock, flags);
if (dch->status == DMA_PAUSED) {
writel_relaxed(CH_CMD_RESUME, dch->base + CH_CMD);
dch->status = DMA_IN_PROGRESS;
}
spin_unlock_irqrestore(&dch->vc.lock, flags);
return 0;
}
static u32 d350_get_residue(struct d350_chan *dch)
{
u32 res, xsize, xsizehi, hi_new;
int retries = 3; /* 1st time unlucky, 2nd improbable, 3rd just broken */
hi_new = readl_relaxed(dch->base + CH_XSIZEHI);
do {
xsizehi = hi_new;
xsize = readl_relaxed(dch->base + CH_XSIZE);
hi_new = readl_relaxed(dch->base + CH_XSIZEHI);
} while (xsizehi != hi_new && --retries);
res = FIELD_GET(CH_XY_DES, xsize);
res |= FIELD_GET(CH_XY_DES, xsizehi) << 16;
return res << dch->desc->tsz;
}
static int d350_terminate_all(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
unsigned long flags;
LIST_HEAD(list);
spin_lock_irqsave(&dch->vc.lock, flags);
writel_relaxed(CH_CMD_STOP, dch->base + CH_CMD);
if (dch->desc) {
if (dch->status != DMA_ERROR)
vchan_terminate_vdesc(&dch->desc->vd);
dch->desc = NULL;
dch->status = DMA_COMPLETE;
}
vchan_get_all_descriptors(&dch->vc, &list);
list_splice_tail(&list, &dch->vc.desc_terminated);
spin_unlock_irqrestore(&dch->vc.lock, flags);
return 0;
}
static void d350_synchronize(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
vchan_synchronize(&dch->vc);
}
static u32 d350_desc_bytes(struct d350_desc *desc)
{
return ((u32)desc->xsizehi << 16 | desc->xsize) << desc->tsz;
}
static enum dma_status d350_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
struct dma_tx_state *state)
{
struct d350_chan *dch = to_d350_chan(chan);
struct virt_dma_desc *vd;
enum dma_status status;
unsigned long flags;
u32 residue = 0;
status = dma_cookie_status(chan, cookie, state);
spin_lock_irqsave(&dch->vc.lock, flags);
if (cookie == dch->cookie) {
status = dch->status;
if (status == DMA_IN_PROGRESS || status == DMA_PAUSED)
dch->residue = d350_get_residue(dch);
residue = dch->residue;
} else if ((vd = vchan_find_desc(&dch->vc, cookie))) {
residue = d350_desc_bytes(to_d350_desc(vd));
} else if (status == DMA_IN_PROGRESS) {
/* Somebody else terminated it? */
status = DMA_ERROR;
}
spin_unlock_irqrestore(&dch->vc.lock, flags);
dma_set_residue(state, residue);
return status;
}
static void d350_start_next(struct d350_chan *dch)
{
u32 hdr, *reg;
dch->desc = to_d350_desc(vchan_next_desc(&dch->vc));
if (!dch->desc)
return;
list_del(&dch->desc->vd.node);
dch->status = DMA_IN_PROGRESS;
dch->cookie = dch->desc->vd.tx.cookie;
dch->residue = d350_desc_bytes(dch->desc);
hdr = dch->desc->command[0];
reg = &dch->desc->command[1];
if (hdr & LINK_INTREN)
writel_relaxed(*reg++, dch->base + CH_INTREN);
if (hdr & LINK_CTRL)
writel_relaxed(*reg++, dch->base + CH_CTRL);
if (hdr & LINK_SRCADDR)
writel_relaxed(*reg++, dch->base + CH_SRCADDR);
if (hdr & LINK_SRCADDRHI)
writel_relaxed(*reg++, dch->base + CH_SRCADDRHI);
if (hdr & LINK_DESADDR)
writel_relaxed(*reg++, dch->base + CH_DESADDR);
if (hdr & LINK_DESADDRHI)
writel_relaxed(*reg++, dch->base + CH_DESADDRHI);
if (hdr & LINK_XSIZE)
writel_relaxed(*reg++, dch->base + CH_XSIZE);
if (hdr & LINK_XSIZEHI)
writel_relaxed(*reg++, dch->base + CH_XSIZEHI);
if (hdr & LINK_SRCTRANSCFG)
writel_relaxed(*reg++, dch->base + CH_SRCTRANSCFG);
if (hdr & LINK_DESTRANSCFG)
writel_relaxed(*reg++, dch->base + CH_DESTRANSCFG);
if (hdr & LINK_XADDRINC)
writel_relaxed(*reg++, dch->base + CH_XADDRINC);
if (hdr & LINK_FILLVAL)
writel_relaxed(*reg++, dch->base + CH_FILLVAL);
if (hdr & LINK_SRCTRIGINCFG)
writel_relaxed(*reg++, dch->base + CH_SRCTRIGINCFG);
if (hdr & LINK_DESTRIGINCFG)
writel_relaxed(*reg++, dch->base + CH_DESTRIGINCFG);
if (hdr & LINK_AUTOCFG)
writel_relaxed(*reg++, dch->base + CH_AUTOCFG);
if (hdr & LINK_LINKADDR)
writel_relaxed(*reg++, dch->base + CH_LINKADDR);
if (hdr & LINK_LINKADDRHI)
writel_relaxed(*reg++, dch->base + CH_LINKADDRHI);
writel(CH_CMD_ENABLE, dch->base + CH_CMD);
}
static void d350_issue_pending(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
unsigned long flags;
spin_lock_irqsave(&dch->vc.lock, flags);
if (vchan_issue_pending(&dch->vc) && !dch->desc)
d350_start_next(dch);
spin_unlock_irqrestore(&dch->vc.lock, flags);
}
static irqreturn_t d350_irq(int irq, void *data)
{
struct d350_chan *dch = data;
struct device *dev = dch->vc.chan.device->dev;
struct virt_dma_desc *vd = &dch->desc->vd;
u32 ch_status;
ch_status = readl(dch->base + CH_STATUS);
if (!ch_status)
return IRQ_NONE;
if (ch_status & CH_STAT_INTR_ERR) {
u32 errinfo = readl_relaxed(dch->base + CH_ERRINFO);
if (errinfo & (CH_ERRINFO_AXIRDPOISERR | CH_ERRINFO_AXIRDRESPERR))
vd->tx_result.result = DMA_TRANS_READ_FAILED;
else if (errinfo & CH_ERRINFO_AXIWRRESPERR)
vd->tx_result.result = DMA_TRANS_WRITE_FAILED;
else
vd->tx_result.result = DMA_TRANS_ABORTED;
vd->tx_result.residue = d350_get_residue(dch);
} else if (!(ch_status & CH_STAT_INTR_DONE)) {
dev_warn(dev, "Unexpected IRQ source? 0x%08x\n", ch_status);
}
writel_relaxed(ch_status, dch->base + CH_STATUS);
spin_lock(&dch->vc.lock);
vchan_cookie_complete(vd);
if (ch_status & CH_STAT_INTR_DONE) {
dch->status = DMA_COMPLETE;
dch->residue = 0;
d350_start_next(dch);
} else {
dch->status = DMA_ERROR;
dch->residue = vd->tx_result.residue;
}
spin_unlock(&dch->vc.lock);
return IRQ_HANDLED;
}
static int d350_alloc_chan_resources(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
int ret = request_irq(dch->irq, d350_irq, IRQF_SHARED,
dev_name(&dch->vc.chan.dev->device), dch);
if (!ret)
writel_relaxed(CH_INTREN_DONE | CH_INTREN_ERR, dch->base + CH_INTREN);
return ret;
}
static void d350_free_chan_resources(struct dma_chan *chan)
{
struct d350_chan *dch = to_d350_chan(chan);
writel_relaxed(0, dch->base + CH_INTREN);
free_irq(dch->irq, dch);
vchan_free_chan_resources(&dch->vc);
}
static int d350_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct d350 *dmac;
void __iomem *base;
u32 reg;
int ret, nchan, dw, aw, r, p;
bool coherent, memset;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
reg = readl_relaxed(base + DMAINFO + IIDR);
r = FIELD_GET(IIDR_VARIANT, reg);
p = FIELD_GET(IIDR_REVISION, reg);
if (FIELD_GET(IIDR_IMPLEMENTER, reg) != IMPLEMENTER_ARM ||
FIELD_GET(IIDR_PRODUCTID, reg) != PRODUCTID_DMA350)
return dev_err_probe(dev, -ENODEV, "Not a DMA-350!");
reg = readl_relaxed(base + DMAINFO + DMA_BUILDCFG0);
nchan = FIELD_GET(DMA_CFG_NUM_CHANNELS, reg) + 1;
dw = 1 << FIELD_GET(DMA_CFG_DATA_WIDTH, reg);
aw = FIELD_GET(DMA_CFG_ADDR_WIDTH, reg) + 1;
dma_set_mask_and_coherent(dev, DMA_BIT_MASK(aw));
coherent = device_get_dma_attr(dev) == DEV_DMA_COHERENT;
dmac = devm_kzalloc(dev, struct_size(dmac, channels, nchan), GFP_KERNEL);
if (!dmac)
return -ENOMEM;
dmac->nchan = nchan;
reg = readl_relaxed(base + DMAINFO + DMA_BUILDCFG1);
dmac->nreq = FIELD_GET(DMA_CFG_NUM_TRIGGER_IN, reg);
dev_dbg(dev, "DMA-350 r%dp%d with %d channels, %d requests\n", r, p, dmac->nchan, dmac->nreq);
dmac->dma.dev = dev;
for (int i = min(dw, 16); i > 0; i /= 2) {
dmac->dma.src_addr_widths |= BIT(i);
dmac->dma.dst_addr_widths |= BIT(i);
}
dmac->dma.directions = BIT(DMA_MEM_TO_MEM);
dmac->dma.descriptor_reuse = true;
dmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
dmac->dma.device_alloc_chan_resources = d350_alloc_chan_resources;
dmac->dma.device_free_chan_resources = d350_free_chan_resources;
dma_cap_set(DMA_MEMCPY, dmac->dma.cap_mask);
dmac->dma.device_prep_dma_memcpy = d350_prep_memcpy;
dmac->dma.device_pause = d350_pause;
dmac->dma.device_resume = d350_resume;
dmac->dma.device_terminate_all = d350_terminate_all;
dmac->dma.device_synchronize = d350_synchronize;
dmac->dma.device_tx_status = d350_tx_status;
dmac->dma.device_issue_pending = d350_issue_pending;
INIT_LIST_HEAD(&dmac->dma.channels);
/* Would be nice to have per-channel caps for this... */
memset = true;
for (int i = 0; i < nchan; i++) {
struct d350_chan *dch = &dmac->channels[i];
dch->base = base + DMACH(i);
writel_relaxed(CH_CMD_CLEAR, dch->base + CH_CMD);
reg = readl_relaxed(dch->base + CH_BUILDCFG1);
if (!(FIELD_GET(CH_CFG_HAS_CMDLINK, reg))) {
dev_warn(dev, "No command link support on channel %d\n", i);
continue;
}
dch->irq = platform_get_irq(pdev, i);
if (dch->irq < 0)
return dev_err_probe(dev, dch->irq,
"Failed to get IRQ for channel %d\n", i);
dch->has_wrap = FIELD_GET(CH_CFG_HAS_WRAP, reg);
dch->has_trig = FIELD_GET(CH_CFG_HAS_TRIGIN, reg) &
FIELD_GET(CH_CFG_HAS_TRIGSEL, reg);
/* Fill is a special case of Wrap */
memset &= dch->has_wrap;
reg = readl_relaxed(dch->base + CH_BUILDCFG0);
dch->tsz = FIELD_GET(CH_CFG_DATA_WIDTH, reg);
reg = FIELD_PREP(CH_LINK_SHAREATTR, coherent ? SHAREATTR_ISH : SHAREATTR_OSH);
reg |= FIELD_PREP(CH_LINK_MEMATTR, coherent ? MEMATTR_WB : MEMATTR_NC);
writel_relaxed(reg, dch->base + CH_LINKATTR);
dch->vc.desc_free = d350_desc_free;
vchan_init(&dch->vc, &dmac->dma);
}
if (memset) {
dma_cap_set(DMA_MEMSET, dmac->dma.cap_mask);
dmac->dma.device_prep_dma_memset = d350_prep_memset;
}
platform_set_drvdata(pdev, dmac);
ret = dma_async_device_register(&dmac->dma);
if (ret)
return dev_err_probe(dev, ret, "Failed to register DMA device\n");
return 0;
}
static void d350_remove(struct platform_device *pdev)
{
struct d350 *dmac = platform_get_drvdata(pdev);
dma_async_device_unregister(&dmac->dma);
}
static const struct of_device_id d350_of_match[] __maybe_unused = {
{ .compatible = "arm,dma-350" },
{}
};
MODULE_DEVICE_TABLE(of, d350_of_match);
static struct platform_driver d350_driver = {
.driver = {
.name = "arm-dma350",
.of_match_table = of_match_ptr(d350_of_match),
},
.probe = d350_probe,
.remove = d350_remove,
};
module_platform_driver(d350_driver);
MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>");
MODULE_DESCRIPTION("Arm DMA-350 driver");
MODULE_LICENSE("GPL v2");