linux/drivers/dma/omap-dma.c
Misael Lopez Cruz e7b2acfc79 dmaengine: omap-dma: Enable burst and data pack for SG
Enable the burst and data pack modes for the scatter-gather
in order to improve the throughput of the data transfers.

The improvement has been verified with MMC HS200 mode in
the DRA72 EVM using the iozone tool to compare the read
throughput (in kB/s) with and without burst/pack for
different reclens (in kB).

                              With
    reclen    Baseline   sDMA burst/pack
    ------    --------   ---------------
       64       46568         50820
      128       57564         63413
      256       65634         74937
      512       72427         83483
     1024       74563         84504
     2048       76265         86079
     4096       78045         87335
     8192       78989         88154
    16384       81265         91034

Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2016-10-01 11:35:27 +05:30

1547 lines
37 KiB
C

/*
* OMAP DMAengine support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/omap-dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of_dma.h>
#include <linux/of_device.h>
#include "virt-dma.h"
#define OMAP_SDMA_REQUESTS 127
#define OMAP_SDMA_CHANNELS 32
struct omap_dmadev {
struct dma_device ddev;
spinlock_t lock;
void __iomem *base;
const struct omap_dma_reg *reg_map;
struct omap_system_dma_plat_info *plat;
bool legacy;
bool ll123_supported;
struct dma_pool *desc_pool;
unsigned dma_requests;
spinlock_t irq_lock;
uint32_t irq_enable_mask;
struct omap_chan **lch_map;
};
struct omap_chan {
struct virt_dma_chan vc;
void __iomem *channel_base;
const struct omap_dma_reg *reg_map;
uint32_t ccr;
struct dma_slave_config cfg;
unsigned dma_sig;
bool cyclic;
bool paused;
bool running;
int dma_ch;
struct omap_desc *desc;
unsigned sgidx;
};
#define DESC_NXT_SV_REFRESH (0x1 << 24)
#define DESC_NXT_SV_REUSE (0x2 << 24)
#define DESC_NXT_DV_REFRESH (0x1 << 26)
#define DESC_NXT_DV_REUSE (0x2 << 26)
#define DESC_NTYPE_TYPE2 (0x2 << 29)
/* Type 2 descriptor with Source or Destination address update */
struct omap_type2_desc {
uint32_t next_desc;
uint32_t en;
uint32_t addr; /* src or dst */
uint16_t fn;
uint16_t cicr;
int16_t cdei;
int16_t csei;
int32_t cdfi;
int32_t csfi;
} __packed;
struct omap_sg {
dma_addr_t addr;
uint32_t en; /* number of elements (24-bit) */
uint32_t fn; /* number of frames (16-bit) */
int32_t fi; /* for double indexing */
int16_t ei; /* for double indexing */
/* Linked list */
struct omap_type2_desc *t2_desc;
dma_addr_t t2_desc_paddr;
};
struct omap_desc {
struct virt_dma_desc vd;
bool using_ll;
enum dma_transfer_direction dir;
dma_addr_t dev_addr;
int32_t fi; /* for OMAP_DMA_SYNC_PACKET / double indexing */
int16_t ei; /* for double indexing */
uint8_t es; /* CSDP_DATA_TYPE_xxx */
uint32_t ccr; /* CCR value */
uint16_t clnk_ctrl; /* CLNK_CTRL value */
uint16_t cicr; /* CICR value */
uint32_t csdp; /* CSDP value */
unsigned sglen;
struct omap_sg sg[0];
};
enum {
CAPS_0_SUPPORT_LL123 = BIT(20), /* Linked List type1/2/3 */
CAPS_0_SUPPORT_LL4 = BIT(21), /* Linked List type4 */
CCR_FS = BIT(5),
CCR_READ_PRIORITY = BIT(6),
CCR_ENABLE = BIT(7),
CCR_AUTO_INIT = BIT(8), /* OMAP1 only */
CCR_REPEAT = BIT(9), /* OMAP1 only */
CCR_OMAP31_DISABLE = BIT(10), /* OMAP1 only */
CCR_SUSPEND_SENSITIVE = BIT(8), /* OMAP2+ only */
CCR_RD_ACTIVE = BIT(9), /* OMAP2+ only */
CCR_WR_ACTIVE = BIT(10), /* OMAP2+ only */
CCR_SRC_AMODE_CONSTANT = 0 << 12,
CCR_SRC_AMODE_POSTINC = 1 << 12,
CCR_SRC_AMODE_SGLIDX = 2 << 12,
CCR_SRC_AMODE_DBLIDX = 3 << 12,
CCR_DST_AMODE_CONSTANT = 0 << 14,
CCR_DST_AMODE_POSTINC = 1 << 14,
CCR_DST_AMODE_SGLIDX = 2 << 14,
CCR_DST_AMODE_DBLIDX = 3 << 14,
CCR_CONSTANT_FILL = BIT(16),
CCR_TRANSPARENT_COPY = BIT(17),
CCR_BS = BIT(18),
CCR_SUPERVISOR = BIT(22),
CCR_PREFETCH = BIT(23),
CCR_TRIGGER_SRC = BIT(24),
CCR_BUFFERING_DISABLE = BIT(25),
CCR_WRITE_PRIORITY = BIT(26),
CCR_SYNC_ELEMENT = 0,
CCR_SYNC_FRAME = CCR_FS,
CCR_SYNC_BLOCK = CCR_BS,
CCR_SYNC_PACKET = CCR_BS | CCR_FS,
CSDP_DATA_TYPE_8 = 0,
CSDP_DATA_TYPE_16 = 1,
CSDP_DATA_TYPE_32 = 2,
CSDP_SRC_PORT_EMIFF = 0 << 2, /* OMAP1 only */
CSDP_SRC_PORT_EMIFS = 1 << 2, /* OMAP1 only */
CSDP_SRC_PORT_OCP_T1 = 2 << 2, /* OMAP1 only */
CSDP_SRC_PORT_TIPB = 3 << 2, /* OMAP1 only */
CSDP_SRC_PORT_OCP_T2 = 4 << 2, /* OMAP1 only */
CSDP_SRC_PORT_MPUI = 5 << 2, /* OMAP1 only */
CSDP_SRC_PACKED = BIT(6),
CSDP_SRC_BURST_1 = 0 << 7,
CSDP_SRC_BURST_16 = 1 << 7,
CSDP_SRC_BURST_32 = 2 << 7,
CSDP_SRC_BURST_64 = 3 << 7,
CSDP_DST_PORT_EMIFF = 0 << 9, /* OMAP1 only */
CSDP_DST_PORT_EMIFS = 1 << 9, /* OMAP1 only */
CSDP_DST_PORT_OCP_T1 = 2 << 9, /* OMAP1 only */
CSDP_DST_PORT_TIPB = 3 << 9, /* OMAP1 only */
CSDP_DST_PORT_OCP_T2 = 4 << 9, /* OMAP1 only */
CSDP_DST_PORT_MPUI = 5 << 9, /* OMAP1 only */
CSDP_DST_PACKED = BIT(13),
CSDP_DST_BURST_1 = 0 << 14,
CSDP_DST_BURST_16 = 1 << 14,
CSDP_DST_BURST_32 = 2 << 14,
CSDP_DST_BURST_64 = 3 << 14,
CICR_TOUT_IE = BIT(0), /* OMAP1 only */
CICR_DROP_IE = BIT(1),
CICR_HALF_IE = BIT(2),
CICR_FRAME_IE = BIT(3),
CICR_LAST_IE = BIT(4),
CICR_BLOCK_IE = BIT(5),
CICR_PKT_IE = BIT(7), /* OMAP2+ only */
CICR_TRANS_ERR_IE = BIT(8), /* OMAP2+ only */
CICR_SUPERVISOR_ERR_IE = BIT(10), /* OMAP2+ only */
CICR_MISALIGNED_ERR_IE = BIT(11), /* OMAP2+ only */
CICR_DRAIN_IE = BIT(12), /* OMAP2+ only */
CICR_SUPER_BLOCK_IE = BIT(14), /* OMAP2+ only */
CLNK_CTRL_ENABLE_LNK = BIT(15),
CDP_DST_VALID_INC = 0 << 0,
CDP_DST_VALID_RELOAD = 1 << 0,
CDP_DST_VALID_REUSE = 2 << 0,
CDP_SRC_VALID_INC = 0 << 2,
CDP_SRC_VALID_RELOAD = 1 << 2,
CDP_SRC_VALID_REUSE = 2 << 2,
CDP_NTYPE_TYPE1 = 1 << 4,
CDP_NTYPE_TYPE2 = 2 << 4,
CDP_NTYPE_TYPE3 = 3 << 4,
CDP_TMODE_NORMAL = 0 << 8,
CDP_TMODE_LLIST = 1 << 8,
CDP_FAST = BIT(10),
};
static const unsigned es_bytes[] = {
[CSDP_DATA_TYPE_8] = 1,
[CSDP_DATA_TYPE_16] = 2,
[CSDP_DATA_TYPE_32] = 4,
};
static struct of_dma_filter_info omap_dma_info = {
.filter_fn = omap_dma_filter_fn,
};
static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d)
{
return container_of(d, struct omap_dmadev, ddev);
}
static inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c)
{
return container_of(c, struct omap_chan, vc.chan);
}
static inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t)
{
return container_of(t, struct omap_desc, vd.tx);
}
static void omap_dma_desc_free(struct virt_dma_desc *vd)
{
struct omap_desc *d = to_omap_dma_desc(&vd->tx);
if (d->using_ll) {
struct omap_dmadev *od = to_omap_dma_dev(vd->tx.chan->device);
int i;
for (i = 0; i < d->sglen; i++) {
if (d->sg[i].t2_desc)
dma_pool_free(od->desc_pool, d->sg[i].t2_desc,
d->sg[i].t2_desc_paddr);
}
}
kfree(d);
}
static void omap_dma_fill_type2_desc(struct omap_desc *d, int idx,
enum dma_transfer_direction dir, bool last)
{
struct omap_sg *sg = &d->sg[idx];
struct omap_type2_desc *t2_desc = sg->t2_desc;
if (idx)
d->sg[idx - 1].t2_desc->next_desc = sg->t2_desc_paddr;
if (last)
t2_desc->next_desc = 0xfffffffc;
t2_desc->en = sg->en;
t2_desc->addr = sg->addr;
t2_desc->fn = sg->fn & 0xffff;
t2_desc->cicr = d->cicr;
if (!last)
t2_desc->cicr &= ~CICR_BLOCK_IE;
switch (dir) {
case DMA_DEV_TO_MEM:
t2_desc->cdei = sg->ei;
t2_desc->csei = d->ei;
t2_desc->cdfi = sg->fi;
t2_desc->csfi = d->fi;
t2_desc->en |= DESC_NXT_DV_REFRESH;
t2_desc->en |= DESC_NXT_SV_REUSE;
break;
case DMA_MEM_TO_DEV:
t2_desc->cdei = d->ei;
t2_desc->csei = sg->ei;
t2_desc->cdfi = d->fi;
t2_desc->csfi = sg->fi;
t2_desc->en |= DESC_NXT_SV_REFRESH;
t2_desc->en |= DESC_NXT_DV_REUSE;
break;
default:
return;
}
t2_desc->en |= DESC_NTYPE_TYPE2;
}
static void omap_dma_write(uint32_t val, unsigned type, void __iomem *addr)
{
switch (type) {
case OMAP_DMA_REG_16BIT:
writew_relaxed(val, addr);
break;
case OMAP_DMA_REG_2X16BIT:
writew_relaxed(val, addr);
writew_relaxed(val >> 16, addr + 2);
break;
case OMAP_DMA_REG_32BIT:
writel_relaxed(val, addr);
break;
default:
WARN_ON(1);
}
}
static unsigned omap_dma_read(unsigned type, void __iomem *addr)
{
unsigned val;
switch (type) {
case OMAP_DMA_REG_16BIT:
val = readw_relaxed(addr);
break;
case OMAP_DMA_REG_2X16BIT:
val = readw_relaxed(addr);
val |= readw_relaxed(addr + 2) << 16;
break;
case OMAP_DMA_REG_32BIT:
val = readl_relaxed(addr);
break;
default:
WARN_ON(1);
val = 0;
}
return val;
}
static void omap_dma_glbl_write(struct omap_dmadev *od, unsigned reg, unsigned val)
{
const struct omap_dma_reg *r = od->reg_map + reg;
WARN_ON(r->stride);
omap_dma_write(val, r->type, od->base + r->offset);
}
static unsigned omap_dma_glbl_read(struct omap_dmadev *od, unsigned reg)
{
const struct omap_dma_reg *r = od->reg_map + reg;
WARN_ON(r->stride);
return omap_dma_read(r->type, od->base + r->offset);
}
static void omap_dma_chan_write(struct omap_chan *c, unsigned reg, unsigned val)
{
const struct omap_dma_reg *r = c->reg_map + reg;
omap_dma_write(val, r->type, c->channel_base + r->offset);
}
static unsigned omap_dma_chan_read(struct omap_chan *c, unsigned reg)
{
const struct omap_dma_reg *r = c->reg_map + reg;
return omap_dma_read(r->type, c->channel_base + r->offset);
}
static void omap_dma_clear_csr(struct omap_chan *c)
{
if (dma_omap1())
omap_dma_chan_read(c, CSR);
else
omap_dma_chan_write(c, CSR, ~0);
}
static unsigned omap_dma_get_csr(struct omap_chan *c)
{
unsigned val = omap_dma_chan_read(c, CSR);
if (!dma_omap1())
omap_dma_chan_write(c, CSR, val);
return val;
}
static void omap_dma_assign(struct omap_dmadev *od, struct omap_chan *c,
unsigned lch)
{
c->channel_base = od->base + od->plat->channel_stride * lch;
od->lch_map[lch] = c;
}
static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
uint16_t cicr = d->cicr;
if (__dma_omap15xx(od->plat->dma_attr))
omap_dma_chan_write(c, CPC, 0);
else
omap_dma_chan_write(c, CDAC, 0);
omap_dma_clear_csr(c);
if (d->using_ll) {
uint32_t cdp = CDP_TMODE_LLIST | CDP_NTYPE_TYPE2 | CDP_FAST;
if (d->dir == DMA_DEV_TO_MEM)
cdp |= (CDP_DST_VALID_RELOAD | CDP_SRC_VALID_REUSE);
else
cdp |= (CDP_DST_VALID_REUSE | CDP_SRC_VALID_RELOAD);
omap_dma_chan_write(c, CDP, cdp);
omap_dma_chan_write(c, CNDP, d->sg[0].t2_desc_paddr);
omap_dma_chan_write(c, CCDN, 0);
omap_dma_chan_write(c, CCFN, 0xffff);
omap_dma_chan_write(c, CCEN, 0xffffff);
cicr &= ~CICR_BLOCK_IE;
} else if (od->ll123_supported) {
omap_dma_chan_write(c, CDP, 0);
}
/* Enable interrupts */
omap_dma_chan_write(c, CICR, cicr);
/* Enable channel */
omap_dma_chan_write(c, CCR, d->ccr | CCR_ENABLE);
c->running = true;
}
static void omap_dma_stop(struct omap_chan *c)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
uint32_t val;
/* disable irq */
omap_dma_chan_write(c, CICR, 0);
omap_dma_clear_csr(c);
val = omap_dma_chan_read(c, CCR);
if (od->plat->errata & DMA_ERRATA_i541 && val & CCR_TRIGGER_SRC) {
uint32_t sysconfig;
unsigned i;
sysconfig = omap_dma_glbl_read(od, OCP_SYSCONFIG);
val = sysconfig & ~DMA_SYSCONFIG_MIDLEMODE_MASK;
val |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
omap_dma_glbl_write(od, OCP_SYSCONFIG, val);
val = omap_dma_chan_read(c, CCR);
val &= ~CCR_ENABLE;
omap_dma_chan_write(c, CCR, val);
/* Wait for sDMA FIFO to drain */
for (i = 0; ; i++) {
val = omap_dma_chan_read(c, CCR);
if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)))
break;
if (i > 100)
break;
udelay(5);
}
if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))
dev_err(c->vc.chan.device->dev,
"DMA drain did not complete on lch %d\n",
c->dma_ch);
omap_dma_glbl_write(od, OCP_SYSCONFIG, sysconfig);
} else {
val &= ~CCR_ENABLE;
omap_dma_chan_write(c, CCR, val);
}
mb();
if (!__dma_omap15xx(od->plat->dma_attr) && c->cyclic) {
val = omap_dma_chan_read(c, CLNK_CTRL);
if (dma_omap1())
val |= 1 << 14; /* set the STOP_LNK bit */
else
val &= ~CLNK_CTRL_ENABLE_LNK;
omap_dma_chan_write(c, CLNK_CTRL, val);
}
c->running = false;
}
static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d)
{
struct omap_sg *sg = d->sg + c->sgidx;
unsigned cxsa, cxei, cxfi;
if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
cxsa = CDSA;
cxei = CDEI;
cxfi = CDFI;
} else {
cxsa = CSSA;
cxei = CSEI;
cxfi = CSFI;
}
omap_dma_chan_write(c, cxsa, sg->addr);
omap_dma_chan_write(c, cxei, sg->ei);
omap_dma_chan_write(c, cxfi, sg->fi);
omap_dma_chan_write(c, CEN, sg->en);
omap_dma_chan_write(c, CFN, sg->fn);
omap_dma_start(c, d);
c->sgidx++;
}
static void omap_dma_start_desc(struct omap_chan *c)
{
struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
struct omap_desc *d;
unsigned cxsa, cxei, cxfi;
if (!vd) {
c->desc = NULL;
return;
}
list_del(&vd->node);
c->desc = d = to_omap_dma_desc(&vd->tx);
c->sgidx = 0;
/*
* This provides the necessary barrier to ensure data held in
* DMA coherent memory is visible to the DMA engine prior to
* the transfer starting.
*/
mb();
omap_dma_chan_write(c, CCR, d->ccr);
if (dma_omap1())
omap_dma_chan_write(c, CCR2, d->ccr >> 16);
if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
cxsa = CSSA;
cxei = CSEI;
cxfi = CSFI;
} else {
cxsa = CDSA;
cxei = CDEI;
cxfi = CDFI;
}
omap_dma_chan_write(c, cxsa, d->dev_addr);
omap_dma_chan_write(c, cxei, d->ei);
omap_dma_chan_write(c, cxfi, d->fi);
omap_dma_chan_write(c, CSDP, d->csdp);
omap_dma_chan_write(c, CLNK_CTRL, d->clnk_ctrl);
omap_dma_start_sg(c, d);
}
static void omap_dma_callback(int ch, u16 status, void *data)
{
struct omap_chan *c = data;
struct omap_desc *d;
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
d = c->desc;
if (d) {
if (c->cyclic) {
vchan_cyclic_callback(&d->vd);
} else if (d->using_ll || c->sgidx == d->sglen) {
omap_dma_start_desc(c);
vchan_cookie_complete(&d->vd);
} else {
omap_dma_start_sg(c, d);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
}
static irqreturn_t omap_dma_irq(int irq, void *devid)
{
struct omap_dmadev *od = devid;
unsigned status, channel;
spin_lock(&od->irq_lock);
status = omap_dma_glbl_read(od, IRQSTATUS_L1);
status &= od->irq_enable_mask;
if (status == 0) {
spin_unlock(&od->irq_lock);
return IRQ_NONE;
}
while ((channel = ffs(status)) != 0) {
unsigned mask, csr;
struct omap_chan *c;
channel -= 1;
mask = BIT(channel);
status &= ~mask;
c = od->lch_map[channel];
if (c == NULL) {
/* This should never happen */
dev_err(od->ddev.dev, "invalid channel %u\n", channel);
continue;
}
csr = omap_dma_get_csr(c);
omap_dma_glbl_write(od, IRQSTATUS_L1, mask);
omap_dma_callback(channel, csr, c);
}
spin_unlock(&od->irq_lock);
return IRQ_HANDLED;
}
static int omap_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
struct omap_chan *c = to_omap_dma_chan(chan);
struct device *dev = od->ddev.dev;
int ret;
if (od->legacy) {
ret = omap_request_dma(c->dma_sig, "DMA engine",
omap_dma_callback, c, &c->dma_ch);
} else {
ret = omap_request_dma(c->dma_sig, "DMA engine", NULL, NULL,
&c->dma_ch);
}
dev_dbg(dev, "allocating channel %u for %u\n", c->dma_ch, c->dma_sig);
if (ret >= 0) {
omap_dma_assign(od, c, c->dma_ch);
if (!od->legacy) {
unsigned val;
spin_lock_irq(&od->irq_lock);
val = BIT(c->dma_ch);
omap_dma_glbl_write(od, IRQSTATUS_L1, val);
od->irq_enable_mask |= val;
omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask);
val = omap_dma_glbl_read(od, IRQENABLE_L0);
val &= ~BIT(c->dma_ch);
omap_dma_glbl_write(od, IRQENABLE_L0, val);
spin_unlock_irq(&od->irq_lock);
}
}
if (dma_omap1()) {
if (__dma_omap16xx(od->plat->dma_attr)) {
c->ccr = CCR_OMAP31_DISABLE;
/* Duplicate what plat-omap/dma.c does */
c->ccr |= c->dma_ch + 1;
} else {
c->ccr = c->dma_sig & 0x1f;
}
} else {
c->ccr = c->dma_sig & 0x1f;
c->ccr |= (c->dma_sig & ~0x1f) << 14;
}
if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING)
c->ccr |= CCR_BUFFERING_DISABLE;
return ret;
}
static void omap_dma_free_chan_resources(struct dma_chan *chan)
{
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
struct omap_chan *c = to_omap_dma_chan(chan);
if (!od->legacy) {
spin_lock_irq(&od->irq_lock);
od->irq_enable_mask &= ~BIT(c->dma_ch);
omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask);
spin_unlock_irq(&od->irq_lock);
}
c->channel_base = NULL;
od->lch_map[c->dma_ch] = NULL;
vchan_free_chan_resources(&c->vc);
omap_free_dma(c->dma_ch);
dev_dbg(od->ddev.dev, "freeing channel %u used for %u\n", c->dma_ch,
c->dma_sig);
c->dma_sig = 0;
}
static size_t omap_dma_sg_size(struct omap_sg *sg)
{
return sg->en * sg->fn;
}
static size_t omap_dma_desc_size(struct omap_desc *d)
{
unsigned i;
size_t size;
for (size = i = 0; i < d->sglen; i++)
size += omap_dma_sg_size(&d->sg[i]);
return size * es_bytes[d->es];
}
static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr)
{
unsigned i;
size_t size, es_size = es_bytes[d->es];
for (size = i = 0; i < d->sglen; i++) {
size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size;
if (size)
size += this_size;
else if (addr >= d->sg[i].addr &&
addr < d->sg[i].addr + this_size)
size += d->sg[i].addr + this_size - addr;
}
return size;
}
/*
* OMAP 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
* read before the DMA controller finished disabling the channel.
*/
static uint32_t omap_dma_chan_read_3_3(struct omap_chan *c, unsigned reg)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
uint32_t val;
val = omap_dma_chan_read(c, reg);
if (val == 0 && od->plat->errata & DMA_ERRATA_3_3)
val = omap_dma_chan_read(c, reg);
return val;
}
static dma_addr_t omap_dma_get_src_pos(struct omap_chan *c)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
dma_addr_t addr, cdac;
if (__dma_omap15xx(od->plat->dma_attr)) {
addr = omap_dma_chan_read(c, CPC);
} else {
addr = omap_dma_chan_read_3_3(c, CSAC);
cdac = omap_dma_chan_read_3_3(c, CDAC);
/*
* CDAC == 0 indicates that the DMA transfer on the channel has
* not been started (no data has been transferred so far).
* Return the programmed source start address in this case.
*/
if (cdac == 0)
addr = omap_dma_chan_read(c, CSSA);
}
if (dma_omap1())
addr |= omap_dma_chan_read(c, CSSA) & 0xffff0000;
return addr;
}
static dma_addr_t omap_dma_get_dst_pos(struct omap_chan *c)
{
struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
dma_addr_t addr;
if (__dma_omap15xx(od->plat->dma_attr)) {
addr = omap_dma_chan_read(c, CPC);
} else {
addr = omap_dma_chan_read_3_3(c, CDAC);
/*
* CDAC == 0 indicates that the DMA transfer on the channel
* has not been started (no data has been transferred so
* far). Return the programmed destination start address in
* this case.
*/
if (addr == 0)
addr = omap_dma_chan_read(c, CDSA);
}
if (dma_omap1())
addr |= omap_dma_chan_read(c, CDSA) & 0xffff0000;
return addr;
}
static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
dma_cookie_t cookie, struct dma_tx_state *txstate)
{
struct omap_chan *c = to_omap_dma_chan(chan);
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
ret = dma_cookie_status(chan, cookie, txstate);
if (!c->paused && c->running) {
uint32_t ccr = omap_dma_chan_read(c, CCR);
/*
* The channel is no longer active, set the return value
* accordingly
*/
if (!(ccr & CCR_ENABLE))
ret = DMA_COMPLETE;
}
if (ret == DMA_COMPLETE || !txstate)
return ret;
spin_lock_irqsave(&c->vc.lock, flags);
vd = vchan_find_desc(&c->vc, cookie);
if (vd) {
txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx));
} else if (c->desc && c->desc->vd.tx.cookie == cookie) {
struct omap_desc *d = c->desc;
dma_addr_t pos;
if (d->dir == DMA_MEM_TO_DEV)
pos = omap_dma_get_src_pos(c);
else if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM)
pos = omap_dma_get_dst_pos(c);
else
pos = 0;
txstate->residue = omap_dma_desc_size_pos(d, pos);
} else {
txstate->residue = 0;
}
spin_unlock_irqrestore(&c->vc.lock, flags);
return ret;
}
static void omap_dma_issue_pending(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
unsigned long flags;
spin_lock_irqsave(&c->vc.lock, flags);
if (vchan_issue_pending(&c->vc) && !c->desc)
omap_dma_start_desc(c);
spin_unlock_irqrestore(&c->vc.lock, flags);
}
static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen,
enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
{
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
struct omap_chan *c = to_omap_dma_chan(chan);
enum dma_slave_buswidth dev_width;
struct scatterlist *sgent;
struct omap_desc *d;
dma_addr_t dev_addr;
unsigned i, es, en, frame_bytes;
bool ll_failed = false;
u32 burst;
if (dir == DMA_DEV_TO_MEM) {
dev_addr = c->cfg.src_addr;
dev_width = c->cfg.src_addr_width;
burst = c->cfg.src_maxburst;
} else if (dir == DMA_MEM_TO_DEV) {
dev_addr = c->cfg.dst_addr;
dev_width = c->cfg.dst_addr_width;
burst = c->cfg.dst_maxburst;
} else {
dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
}
/* Bus width translates to the element size (ES) */
switch (dev_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
es = CSDP_DATA_TYPE_8;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
es = CSDP_DATA_TYPE_16;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
es = CSDP_DATA_TYPE_32;
break;
default: /* not reached */
return NULL;
}
/* Now allocate and setup the descriptor. */
d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
return NULL;
d->dir = dir;
d->dev_addr = dev_addr;
d->es = es;
d->ccr = c->ccr | CCR_SYNC_FRAME;
if (dir == DMA_DEV_TO_MEM) {
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
} else {
d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
}
d->cicr = CICR_DROP_IE | CICR_BLOCK_IE;
d->csdp |= es;
if (dma_omap1()) {
d->cicr |= CICR_TOUT_IE;
if (dir == DMA_DEV_TO_MEM)
d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_TIPB;
else
d->csdp |= CSDP_DST_PORT_TIPB | CSDP_SRC_PORT_EMIFF;
} else {
if (dir == DMA_DEV_TO_MEM)
d->ccr |= CCR_TRIGGER_SRC;
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
}
if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
d->clnk_ctrl = c->dma_ch;
/*
* Build our scatterlist entries: each contains the address,
* the number of elements (EN) in each frame, and the number of
* frames (FN). Number of bytes for this entry = ES * EN * FN.
*
* Burst size translates to number of elements with frame sync.
* Note: DMA engine defines burst to be the number of dev-width
* transfers.
*/
en = burst;
frame_bytes = es_bytes[es] * en;
if (sglen >= 2)
d->using_ll = od->ll123_supported;
for_each_sg(sgl, sgent, sglen, i) {
struct omap_sg *osg = &d->sg[i];
osg->addr = sg_dma_address(sgent);
osg->en = en;
osg->fn = sg_dma_len(sgent) / frame_bytes;
if (d->using_ll) {
osg->t2_desc = dma_pool_alloc(od->desc_pool, GFP_ATOMIC,
&osg->t2_desc_paddr);
if (!osg->t2_desc) {
dev_err(chan->device->dev,
"t2_desc[%d] allocation failed\n", i);
ll_failed = true;
d->using_ll = false;
continue;
}
omap_dma_fill_type2_desc(d, i, dir, (i == sglen - 1));
}
}
d->sglen = sglen;
/* Release the dma_pool entries if one allocation failed */
if (ll_failed) {
for (i = 0; i < d->sglen; i++) {
struct omap_sg *osg = &d->sg[i];
if (osg->t2_desc) {
dma_pool_free(od->desc_pool, osg->t2_desc,
osg->t2_desc_paddr);
osg->t2_desc = NULL;
}
}
}
return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
}
static struct dma_async_tx_descriptor *omap_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 omap_dmadev *od = to_omap_dma_dev(chan->device);
struct omap_chan *c = to_omap_dma_chan(chan);
enum dma_slave_buswidth dev_width;
struct omap_desc *d;
dma_addr_t dev_addr;
unsigned es;
u32 burst;
if (dir == DMA_DEV_TO_MEM) {
dev_addr = c->cfg.src_addr;
dev_width = c->cfg.src_addr_width;
burst = c->cfg.src_maxburst;
} else if (dir == DMA_MEM_TO_DEV) {
dev_addr = c->cfg.dst_addr;
dev_width = c->cfg.dst_addr_width;
burst = c->cfg.dst_maxburst;
} else {
dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
}
/* Bus width translates to the element size (ES) */
switch (dev_width) {
case DMA_SLAVE_BUSWIDTH_1_BYTE:
es = CSDP_DATA_TYPE_8;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
es = CSDP_DATA_TYPE_16;
break;
case DMA_SLAVE_BUSWIDTH_4_BYTES:
es = CSDP_DATA_TYPE_32;
break;
default: /* not reached */
return NULL;
}
/* Now allocate and setup the descriptor. */
d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
return NULL;
d->dir = dir;
d->dev_addr = dev_addr;
d->fi = burst;
d->es = es;
d->sg[0].addr = buf_addr;
d->sg[0].en = period_len / es_bytes[es];
d->sg[0].fn = buf_len / period_len;
d->sglen = 1;
d->ccr = c->ccr;
if (dir == DMA_DEV_TO_MEM)
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
else
d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
d->cicr = CICR_DROP_IE;
if (flags & DMA_PREP_INTERRUPT)
d->cicr |= CICR_FRAME_IE;
d->csdp = es;
if (dma_omap1()) {
d->cicr |= CICR_TOUT_IE;
if (dir == DMA_DEV_TO_MEM)
d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_MPUI;
else
d->csdp |= CSDP_DST_PORT_MPUI | CSDP_SRC_PORT_EMIFF;
} else {
if (burst)
d->ccr |= CCR_SYNC_PACKET;
else
d->ccr |= CCR_SYNC_ELEMENT;
if (dir == DMA_DEV_TO_MEM) {
d->ccr |= CCR_TRIGGER_SRC;
d->csdp |= CSDP_DST_PACKED;
} else {
d->csdp |= CSDP_SRC_PACKED;
}
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
}
if (__dma_omap15xx(od->plat->dma_attr))
d->ccr |= CCR_AUTO_INIT | CCR_REPEAT;
else
d->clnk_ctrl = c->dma_ch | CLNK_CTRL_ENABLE_LNK;
c->cyclic = true;
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static struct dma_async_tx_descriptor *omap_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long tx_flags)
{
struct omap_chan *c = to_omap_dma_chan(chan);
struct omap_desc *d;
uint8_t data_type;
d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
return NULL;
data_type = __ffs((src | dest | len));
if (data_type > CSDP_DATA_TYPE_32)
data_type = CSDP_DATA_TYPE_32;
d->dir = DMA_MEM_TO_MEM;
d->dev_addr = src;
d->fi = 0;
d->es = data_type;
d->sg[0].en = len / BIT(data_type);
d->sg[0].fn = 1;
d->sg[0].addr = dest;
d->sglen = 1;
d->ccr = c->ccr;
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_POSTINC;
d->cicr = CICR_DROP_IE | CICR_FRAME_IE;
d->csdp = data_type;
if (dma_omap1()) {
d->cicr |= CICR_TOUT_IE;
d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_EMIFF;
} else {
d->csdp |= CSDP_DST_PACKED | CSDP_SRC_PACKED;
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
}
return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
}
static struct dma_async_tx_descriptor *omap_dma_prep_dma_interleaved(
struct dma_chan *chan, struct dma_interleaved_template *xt,
unsigned long flags)
{
struct omap_chan *c = to_omap_dma_chan(chan);
struct omap_desc *d;
struct omap_sg *sg;
uint8_t data_type;
size_t src_icg, dst_icg;
/* Slave mode is not supported */
if (is_slave_direction(xt->dir))
return NULL;
if (xt->frame_size != 1 || xt->numf == 0)
return NULL;
d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
if (!d)
return NULL;
data_type = __ffs((xt->src_start | xt->dst_start | xt->sgl[0].size));
if (data_type > CSDP_DATA_TYPE_32)
data_type = CSDP_DATA_TYPE_32;
sg = &d->sg[0];
d->dir = DMA_MEM_TO_MEM;
d->dev_addr = xt->src_start;
d->es = data_type;
sg->en = xt->sgl[0].size / BIT(data_type);
sg->fn = xt->numf;
sg->addr = xt->dst_start;
d->sglen = 1;
d->ccr = c->ccr;
src_icg = dmaengine_get_src_icg(xt, &xt->sgl[0]);
dst_icg = dmaengine_get_dst_icg(xt, &xt->sgl[0]);
if (src_icg) {
d->ccr |= CCR_SRC_AMODE_DBLIDX;
d->ei = 1;
d->fi = src_icg;
} else if (xt->src_inc) {
d->ccr |= CCR_SRC_AMODE_POSTINC;
d->fi = 0;
} else {
dev_err(chan->device->dev,
"%s: SRC constant addressing is not supported\n",
__func__);
kfree(d);
return NULL;
}
if (dst_icg) {
d->ccr |= CCR_DST_AMODE_DBLIDX;
sg->ei = 1;
sg->fi = dst_icg;
} else if (xt->dst_inc) {
d->ccr |= CCR_DST_AMODE_POSTINC;
sg->fi = 0;
} else {
dev_err(chan->device->dev,
"%s: DST constant addressing is not supported\n",
__func__);
kfree(d);
return NULL;
}
d->cicr = CICR_DROP_IE | CICR_FRAME_IE;
d->csdp = data_type;
if (dma_omap1()) {
d->cicr |= CICR_TOUT_IE;
d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_EMIFF;
} else {
d->csdp |= CSDP_DST_PACKED | CSDP_SRC_PACKED;
d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
}
return vchan_tx_prep(&c->vc, &d->vd, flags);
}
static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
{
struct omap_chan *c = to_omap_dma_chan(chan);
if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
memcpy(&c->cfg, cfg, sizeof(c->cfg));
return 0;
}
static int omap_dma_terminate_all(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
unsigned long flags;
LIST_HEAD(head);
spin_lock_irqsave(&c->vc.lock, flags);
/*
* Stop DMA activity: we assume the callback will not be called
* after omap_dma_stop() returns (even if it does, it will see
* c->desc is NULL and exit.)
*/
if (c->desc) {
omap_dma_desc_free(&c->desc->vd);
c->desc = NULL;
/* Avoid stopping the dma twice */
if (!c->paused)
omap_dma_stop(c);
}
if (c->cyclic) {
c->cyclic = false;
c->paused = false;
}
vchan_get_all_descriptors(&c->vc, &head);
spin_unlock_irqrestore(&c->vc.lock, flags);
vchan_dma_desc_free_list(&c->vc, &head);
return 0;
}
static void omap_dma_synchronize(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
vchan_synchronize(&c->vc);
}
static int omap_dma_pause(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
/* Pause/Resume only allowed with cyclic mode */
if (!c->cyclic)
return -EINVAL;
if (!c->paused) {
omap_dma_stop(c);
c->paused = true;
}
return 0;
}
static int omap_dma_resume(struct dma_chan *chan)
{
struct omap_chan *c = to_omap_dma_chan(chan);
/* Pause/Resume only allowed with cyclic mode */
if (!c->cyclic)
return -EINVAL;
if (c->paused) {
mb();
/* Restore channel link register */
omap_dma_chan_write(c, CLNK_CTRL, c->desc->clnk_ctrl);
omap_dma_start(c, c->desc);
c->paused = false;
}
return 0;
}
static int omap_dma_chan_init(struct omap_dmadev *od)
{
struct omap_chan *c;
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
c->reg_map = od->reg_map;
c->vc.desc_free = omap_dma_desc_free;
vchan_init(&c->vc, &od->ddev);
return 0;
}
static void omap_dma_free(struct omap_dmadev *od)
{
while (!list_empty(&od->ddev.channels)) {
struct omap_chan *c = list_first_entry(&od->ddev.channels,
struct omap_chan, vc.chan.device_node);
list_del(&c->vc.chan.device_node);
tasklet_kill(&c->vc.task);
kfree(c);
}
}
#define OMAP_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
static int omap_dma_probe(struct platform_device *pdev)
{
struct omap_dmadev *od;
struct resource *res;
int rc, i, irq;
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
if (!od)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
od->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(od->base))
return PTR_ERR(od->base);
od->plat = omap_get_plat_info();
if (!od->plat)
return -EPROBE_DEFER;
od->reg_map = od->plat->reg_map;
dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
dma_cap_set(DMA_INTERLEAVE, od->ddev.cap_mask);
od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources;
od->ddev.device_free_chan_resources = omap_dma_free_chan_resources;
od->ddev.device_tx_status = omap_dma_tx_status;
od->ddev.device_issue_pending = omap_dma_issue_pending;
od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg;
od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic;
od->ddev.device_prep_dma_memcpy = omap_dma_prep_dma_memcpy;
od->ddev.device_prep_interleaved_dma = omap_dma_prep_dma_interleaved;
od->ddev.device_config = omap_dma_slave_config;
od->ddev.device_pause = omap_dma_pause;
od->ddev.device_resume = omap_dma_resume;
od->ddev.device_terminate_all = omap_dma_terminate_all;
od->ddev.device_synchronize = omap_dma_synchronize;
od->ddev.src_addr_widths = OMAP_DMA_BUSWIDTHS;
od->ddev.dst_addr_widths = OMAP_DMA_BUSWIDTHS;
od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);
spin_lock_init(&od->lock);
spin_lock_init(&od->irq_lock);
if (!pdev->dev.of_node) {
od->dma_requests = od->plat->dma_attr->lch_count;
if (unlikely(!od->dma_requests))
od->dma_requests = OMAP_SDMA_REQUESTS;
} else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
&od->dma_requests)) {
dev_info(&pdev->dev,
"Missing dma-requests property, using %u.\n",
OMAP_SDMA_REQUESTS);
od->dma_requests = OMAP_SDMA_REQUESTS;
}
od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
sizeof(*od->lch_map), GFP_KERNEL);
if (!od->lch_map)
return -ENOMEM;
for (i = 0; i < od->dma_requests; i++) {
rc = omap_dma_chan_init(od);
if (rc) {
omap_dma_free(od);
return rc;
}
}
irq = platform_get_irq(pdev, 1);
if (irq <= 0) {
dev_info(&pdev->dev, "failed to get L1 IRQ: %d\n", irq);
od->legacy = true;
} else {
/* Disable all interrupts */
od->irq_enable_mask = 0;
omap_dma_glbl_write(od, IRQENABLE_L1, 0);
rc = devm_request_irq(&pdev->dev, irq, omap_dma_irq,
IRQF_SHARED, "omap-dma-engine", od);
if (rc)
return rc;
}
if (omap_dma_glbl_read(od, CAPS_0) & CAPS_0_SUPPORT_LL123)
od->ll123_supported = true;
od->ddev.filter.map = od->plat->slave_map;
od->ddev.filter.mapcnt = od->plat->slavecnt;
od->ddev.filter.fn = omap_dma_filter_fn;
if (od->ll123_supported) {
od->desc_pool = dma_pool_create(dev_name(&pdev->dev),
&pdev->dev,
sizeof(struct omap_type2_desc),
4, 0);
if (!od->desc_pool) {
dev_err(&pdev->dev,
"unable to allocate descriptor pool\n");
od->ll123_supported = false;
}
}
rc = dma_async_device_register(&od->ddev);
if (rc) {
pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n",
rc);
omap_dma_free(od);
return rc;
}
platform_set_drvdata(pdev, od);
if (pdev->dev.of_node) {
omap_dma_info.dma_cap = od->ddev.cap_mask;
/* Device-tree DMA controller registration */
rc = of_dma_controller_register(pdev->dev.of_node,
of_dma_simple_xlate, &omap_dma_info);
if (rc) {
pr_warn("OMAP-DMA: failed to register DMA controller\n");
dma_async_device_unregister(&od->ddev);
omap_dma_free(od);
}
}
dev_info(&pdev->dev, "OMAP DMA engine driver%s\n",
od->ll123_supported ? " (LinkedList1/2/3 supported)" : "");
return rc;
}
static int omap_dma_remove(struct platform_device *pdev)
{
struct omap_dmadev *od = platform_get_drvdata(pdev);
int irq;
if (pdev->dev.of_node)
of_dma_controller_free(pdev->dev.of_node);
irq = platform_get_irq(pdev, 1);
devm_free_irq(&pdev->dev, irq, od);
dma_async_device_unregister(&od->ddev);
if (!od->legacy) {
/* Disable all interrupts */
omap_dma_glbl_write(od, IRQENABLE_L0, 0);
}
if (od->ll123_supported)
dma_pool_destroy(od->desc_pool);
omap_dma_free(od);
return 0;
}
static const struct of_device_id omap_dma_match[] = {
{ .compatible = "ti,omap2420-sdma", },
{ .compatible = "ti,omap2430-sdma", },
{ .compatible = "ti,omap3430-sdma", },
{ .compatible = "ti,omap3630-sdma", },
{ .compatible = "ti,omap4430-sdma", },
{},
};
MODULE_DEVICE_TABLE(of, omap_dma_match);
static struct platform_driver omap_dma_driver = {
.probe = omap_dma_probe,
.remove = omap_dma_remove,
.driver = {
.name = "omap-dma-engine",
.of_match_table = of_match_ptr(omap_dma_match),
},
};
bool omap_dma_filter_fn(struct dma_chan *chan, void *param)
{
if (chan->device->dev->driver == &omap_dma_driver.driver) {
struct omap_dmadev *od = to_omap_dma_dev(chan->device);
struct omap_chan *c = to_omap_dma_chan(chan);
unsigned req = *(unsigned *)param;
if (req <= od->dma_requests) {
c->dma_sig = req;
return true;
}
}
return false;
}
EXPORT_SYMBOL_GPL(omap_dma_filter_fn);
static int omap_dma_init(void)
{
return platform_driver_register(&omap_dma_driver);
}
subsys_initcall(omap_dma_init);
static void __exit omap_dma_exit(void)
{
platform_driver_unregister(&omap_dma_driver);
}
module_exit(omap_dma_exit);
MODULE_AUTHOR("Russell King");
MODULE_LICENSE("GPL");