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path: root/drivers/dma/pl330.c
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Diffstat (limited to 'drivers/dma/pl330.c')
-rw-r--r--drivers/dma/pl330.c101
1 files changed, 73 insertions, 28 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 17ee758b419f..372b4359da97 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -33,6 +33,9 @@
#define PL330_MAX_CHAN 8
#define PL330_MAX_IRQS 32
#define PL330_MAX_PERI 32
+#define PL330_MAX_BURST 16
+
+#define PL330_QUIRK_BROKEN_NO_FLUSHP BIT(0)
enum pl330_cachectrl {
CCTRL0, /* Noncacheable and nonbufferable */
@@ -488,6 +491,17 @@ struct pl330_dmac {
/* Peripheral channels connected to this DMAC */
unsigned int num_peripherals;
struct dma_pl330_chan *peripherals; /* keep at end */
+ int quirks;
+};
+
+static struct pl330_of_quirks {
+ char *quirk;
+ int id;
+} of_quirks[] = {
+ {
+ .quirk = "arm,pl330-broken-no-flushp",
+ .id = PL330_QUIRK_BROKEN_NO_FLUSHP,
+ }
};
struct dma_pl330_desc {
@@ -1137,47 +1151,67 @@ static inline int _ldst_memtomem(unsigned dry_run, u8 buf[],
return off;
}
-static inline int _ldst_devtomem(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
+static inline int _ldst_devtomem(struct pl330_dmac *pl330, unsigned dry_run,
+ u8 buf[], const struct _xfer_spec *pxs,
+ int cyc)
{
int off = 0;
+ enum pl330_cond cond;
+
+ if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
+ cond = BURST;
+ else
+ cond = SINGLE;
while (cyc--) {
- off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
- off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
+ off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
+ off += _emit_LDP(dry_run, &buf[off], cond, pxs->desc->peri);
off += _emit_ST(dry_run, &buf[off], ALWAYS);
- off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri);
+
+ if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
+ off += _emit_FLUSHP(dry_run, &buf[off],
+ pxs->desc->peri);
}
return off;
}
-static inline int _ldst_memtodev(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs, int cyc)
+static inline int _ldst_memtodev(struct pl330_dmac *pl330,
+ unsigned dry_run, u8 buf[],
+ const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
+ enum pl330_cond cond;
+
+ if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
+ cond = BURST;
+ else
+ cond = SINGLE;
while (cyc--) {
- off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
+ off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
off += _emit_LD(dry_run, &buf[off], ALWAYS);
- off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
- off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri);
+ off += _emit_STP(dry_run, &buf[off], cond, pxs->desc->peri);
+
+ if (!(pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP))
+ off += _emit_FLUSHP(dry_run, &buf[off],
+ pxs->desc->peri);
}
return off;
}
-static int _bursts(unsigned dry_run, u8 buf[],
+static int _bursts(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
const struct _xfer_spec *pxs, int cyc)
{
int off = 0;
switch (pxs->desc->rqtype) {
case DMA_MEM_TO_DEV:
- off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc);
+ off += _ldst_memtodev(pl330, dry_run, &buf[off], pxs, cyc);
break;
case DMA_DEV_TO_MEM:
- off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc);
+ off += _ldst_devtomem(pl330, dry_run, &buf[off], pxs, cyc);
break;
case DMA_MEM_TO_MEM:
off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc);
@@ -1191,7 +1225,7 @@ static int _bursts(unsigned dry_run, u8 buf[],
}
/* Returns bytes consumed and updates bursts */
-static inline int _loop(unsigned dry_run, u8 buf[],
+static inline int _loop(struct pl330_dmac *pl330, unsigned dry_run, u8 buf[],
unsigned long *bursts, const struct _xfer_spec *pxs)
{
int cyc, cycmax, szlp, szlpend, szbrst, off;
@@ -1199,7 +1233,7 @@ static inline int _loop(unsigned dry_run, u8 buf[],
struct _arg_LPEND lpend;
if (*bursts == 1)
- return _bursts(dry_run, buf, pxs, 1);
+ return _bursts(pl330, dry_run, buf, pxs, 1);
/* Max iterations possible in DMALP is 256 */
if (*bursts >= 256*256) {
@@ -1217,7 +1251,7 @@ static inline int _loop(unsigned dry_run, u8 buf[],
}
szlp = _emit_LP(1, buf, 0, 0);
- szbrst = _bursts(1, buf, pxs, 1);
+ szbrst = _bursts(pl330, 1, buf, pxs, 1);
lpend.cond = ALWAYS;
lpend.forever = false;
@@ -1249,7 +1283,7 @@ static inline int _loop(unsigned dry_run, u8 buf[],
off += _emit_LP(dry_run, &buf[off], 1, lcnt1);
ljmp1 = off;
- off += _bursts(dry_run, &buf[off], pxs, cyc);
+ off += _bursts(pl330, dry_run, &buf[off], pxs, cyc);
lpend.cond = ALWAYS;
lpend.forever = false;
@@ -1272,8 +1306,9 @@ static inline int _loop(unsigned dry_run, u8 buf[],
return off;
}
-static inline int _setup_loops(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs)
+static inline int _setup_loops(struct pl330_dmac *pl330,
+ unsigned dry_run, u8 buf[],
+ const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = &pxs->desc->px;
u32 ccr = pxs->ccr;
@@ -1282,15 +1317,16 @@ static inline int _setup_loops(unsigned dry_run, u8 buf[],
while (bursts) {
c = bursts;
- off += _loop(dry_run, &buf[off], &c, pxs);
+ off += _loop(pl330, dry_run, &buf[off], &c, pxs);
bursts -= c;
}
return off;
}
-static inline int _setup_xfer(unsigned dry_run, u8 buf[],
- const struct _xfer_spec *pxs)
+static inline int _setup_xfer(struct pl330_dmac *pl330,
+ unsigned dry_run, u8 buf[],
+ const struct _xfer_spec *pxs)
{
struct pl330_xfer *x = &pxs->desc->px;
int off = 0;
@@ -1301,7 +1337,7 @@ static inline int _setup_xfer(unsigned dry_run, u8 buf[],
off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr);
/* Setup Loop(s) */
- off += _setup_loops(dry_run, &buf[off], pxs);
+ off += _setup_loops(pl330, dry_run, &buf[off], pxs);
return off;
}
@@ -1310,8 +1346,9 @@ static inline int _setup_xfer(unsigned dry_run, u8 buf[],
* A req is a sequence of one or more xfer units.
* Returns the number of bytes taken to setup the MC for the req.
*/
-static int _setup_req(unsigned dry_run, struct pl330_thread *thrd,
- unsigned index, struct _xfer_spec *pxs)
+static int _setup_req(struct pl330_dmac *pl330, unsigned dry_run,
+ struct pl330_thread *thrd, unsigned index,
+ struct _xfer_spec *pxs)
{
struct _pl330_req *req = &thrd->req[index];
struct pl330_xfer *x;
@@ -1328,7 +1365,7 @@ static int _setup_req(unsigned dry_run, struct pl330_thread *thrd,
if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr)))
return -EINVAL;
- off += _setup_xfer(dry_run, &buf[off], pxs);
+ off += _setup_xfer(pl330, dry_run, &buf[off], pxs);
/* DMASEV peripheral/event */
off += _emit_SEV(dry_run, &buf[off], thrd->ev);
@@ -1422,7 +1459,7 @@ static int pl330_submit_req(struct pl330_thread *thrd,
xs.desc = desc;
/* First dry run to check if req is acceptable */
- ret = _setup_req(1, thrd, idx, &xs);
+ ret = _setup_req(pl330, 1, thrd, idx, &xs);
if (ret < 0)
goto xfer_exit;
@@ -1436,7 +1473,7 @@ static int pl330_submit_req(struct pl330_thread *thrd,
/* Hook the request */
thrd->lstenq = idx;
thrd->req[idx].desc = desc;
- _setup_req(0, thrd, idx, &xs);
+ _setup_req(pl330, 0, thrd, idx, &xs);
ret = 0;
@@ -2781,6 +2818,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
struct resource *res;
int i, ret, irq;
int num_chan;
+ struct device_node *np = adev->dev.of_node;
pdat = dev_get_platdata(&adev->dev);
@@ -2800,6 +2838,11 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
+ /* get quirk */
+ for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
+ if (of_property_read_bool(np, of_quirks[i].quirk))
+ pl330->quirks |= of_quirks[i].id;
+
res = &adev->res;
pl330->base = devm_ioremap_resource(&adev->dev, res);
if (IS_ERR(pl330->base))
@@ -2895,6 +2938,8 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pd->dst_addr_widths = PL330_DMA_BUSWIDTHS;
pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
pd->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+ pd->max_burst = ((pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) ?
+ 1 : PL330_MAX_BURST);
ret = dma_async_device_register(pd);
if (ret) {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.