On K3 SoCs, DMA channels are shared across multiple entities, therefore
U-Boot DMA driver needs to query resource range from centralised
resource management controller i.e SystemFirmware and use DMA channels
allocated for A72 host. Add support for the same.
Signed-off-by: Vignesh Raghavendra <vigne...@ti.com>
---
drivers/dma/ti/k3-udma-hwdef.h | 19 ++++
drivers/dma/ti/k3-udma.c | 179 ++++++++++++++++++++++++++++-----
2 files changed, 171 insertions(+), 27 deletions(-)
diff --git a/drivers/dma/ti/k3-udma-hwdef.h b/drivers/dma/ti/k3-udma-hwdef.h
index c88399a815ea..228a44cb73cf 100644
--- a/drivers/dma/ti/k3-udma-hwdef.h
+++ b/drivers/dma/ti/k3-udma-hwdef.h
@@ -181,4 +181,23 @@
#define PDMA_STATIC_TR_Z(x) \
(((x) << PDMA_STATIC_TR_Z_SHIFT) & PDMA_STATIC_TR_Z_MASK)
+enum udma_rm_range {
+ RM_RANGE_TCHAN = 0,
+ RM_RANGE_RCHAN,
+ RM_RANGE_RFLOW,
+ RM_RANGE_LAST,
+};
+
+struct udma_tisci_rm {
+ const struct ti_sci_handle *tisci;
+ const struct ti_sci_rm_udmap_ops *tisci_udmap_ops;
+ u32 tisci_dev_id;
+
+ /* tisci information for PSI-L thread pairing/unpairing */
+ const struct ti_sci_rm_psil_ops *tisci_psil_ops;
+ u32 tisci_navss_dev_id;
+
+ struct ti_sci_resource *rm_ranges[RM_RANGE_LAST];
+};
+
#endif /* K3_NAVSS_UDMA_HWDEF_H_ */
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index a5fc7809bc41..2380780879f5 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -11,12 +11,14 @@
#include <malloc.h>
#include <asm/dma-mapping.h>
#include <dm.h>
+#include <dm/device.h>
#include <dm/read.h>
#include <dm/of_access.h>
#include <dma.h>
#include <dma-uclass.h>
#include <linux/delay.h>
#include <dt-bindings/dma/k3-udma.h>
+#include <linux/bitmap.h>
#include <linux/soc/ti/k3-navss-ringacc.h>
#include <linux/soc/ti/cppi5.h>
#include <linux/soc/ti/ti-udma.h>
@@ -30,6 +32,8 @@
#define RINGACC_RING_USE_PROXY (1)
#endif
+#define K3_UDMA_MAX_RFLOWS 1024
+
struct udma_chan;
enum udma_mmr {
@@ -64,9 +68,10 @@ struct udma_rflow {
};
struct udma_dev {
- struct device *dev;
+ struct udevice *dev;
void __iomem *mmrs[MMR_LAST];
+ struct udma_tisci_rm tisci_rm;
struct k3_nav_ringacc *ringacc;
u32 features;
@@ -78,6 +83,7 @@ struct udma_dev {
unsigned long *tchan_map;
unsigned long *rchan_map;
unsigned long *rflow_map;
+ unsigned long *rflow_map_reserved;
struct udma_tchan *tchans;
struct udma_rchan *rchans;
@@ -535,6 +541,28 @@ static void udma_poll_completion(struct udma_chan *uc,
dma_addr_t *paddr)
}
}
+static struct udma_rflow *__udma_reserve_rflow(struct udma_dev *ud, int id)
+{
+ DECLARE_BITMAP(tmp, K3_UDMA_MAX_RFLOWS);
+
+ if (id >= 0) {
+ if (test_bit(id, ud->rflow_map)) {
+ dev_err(ud->dev, "rflow%d is in use\n", id);
+ return ERR_PTR(-ENOENT);
+ }
+ } else {
+ bitmap_or(tmp, ud->rflow_map, ud->rflow_map_reserved,
+ ud->rflow_cnt);
+
+ id = find_next_zero_bit(tmp, ud->rflow_cnt, ud->rchan_cnt);
+ if (id >= ud->rflow_cnt)
+ return ERR_PTR(-ENOENT);
+ }
+
+ __set_bit(id, ud->rflow_map);
+ return &ud->rflows[id];
+}
+
#define UDMA_RESERVE_RESOURCE(res) \
static struct udma_##res *__udma_reserve_##res(struct udma_dev *ud, \
int id) \
@@ -557,7 +585,6 @@ static struct udma_##res *__udma_reserve_##res(struct
udma_dev *ud, \
UDMA_RESERVE_RESOURCE(tchan);
UDMA_RESERVE_RESOURCE(rchan);
-UDMA_RESERVE_RESOURCE(rflow);
static int udma_get_tchan(struct udma_chan *uc)
{
@@ -1103,14 +1130,129 @@ static int udma_get_mmrs(struct udevice *dev)
return 0;
}
-#define UDMA_MAX_CHANNELS 192
+static int udma_setup_resources(struct udma_dev *ud)
+{
+ struct udevice *dev = ud->dev;
+ int ch_count, i;
+ u32 cap2, cap3;
+ struct ti_sci_resource_desc *rm_desc;
+ struct ti_sci_resource *rm_res;
+ struct udma_tisci_rm *tisci_rm = &ud->tisci_rm;
+ static const char * const range_names[] = { "ti,sci-rm-range-tchan",
+ "ti,sci-rm-range-rchan",
+ "ti,sci-rm-range-rflow" };
+
+ cap2 = udma_read(ud->mmrs[MMR_GCFG], 0x28);
+ cap3 = udma_read(ud->mmrs[MMR_GCFG], 0x2c);
+
+ ud->rflow_cnt = cap3 & 0x3fff;
+ ud->tchan_cnt = cap2 & 0x1ff;
+ ud->echan_cnt = (cap2 >> 9) & 0x1ff;
+ ud->rchan_cnt = (cap2 >> 18) & 0x1ff;
+ ch_count = ud->tchan_cnt + ud->rchan_cnt;
+
+ ud->tchan_map = devm_kmalloc_array(dev, BITS_TO_LONGS(ud->tchan_cnt),
+ sizeof(unsigned long), GFP_KERNEL);
+ ud->tchans = devm_kcalloc(dev, ud->tchan_cnt, sizeof(*ud->tchans),
+ GFP_KERNEL);
+ ud->rchan_map = devm_kmalloc_array(dev, BITS_TO_LONGS(ud->rchan_cnt),
+ sizeof(unsigned long), GFP_KERNEL);
+ ud->rchans = devm_kcalloc(dev, ud->rchan_cnt, sizeof(*ud->rchans),
+ GFP_KERNEL);
+ ud->rflow_map = devm_kmalloc_array(dev, BITS_TO_LONGS(ud->rflow_cnt),
+ sizeof(unsigned long), GFP_KERNEL);
+ ud->rflow_map_reserved = devm_kcalloc(dev, BITS_TO_LONGS(ud->rflow_cnt),
+ sizeof(unsigned long),
+ GFP_KERNEL);
+ ud->rflows = devm_kcalloc(dev, ud->rflow_cnt, sizeof(*ud->rflows),
+ GFP_KERNEL);
+
+ if (!ud->tchan_map || !ud->rchan_map || !ud->rflow_map ||
+ !ud->rflow_map_reserved || !ud->tchans || !ud->rchans ||
+ !ud->rflows)
+ return -ENOMEM;
+
+ /*
+ * RX flows with the same Ids as RX channels are reserved to be used
+ * as default flows if remote HW can't generate flow_ids. Those
+ * RX flows can be requested only explicitly by id.
+ */
+ bitmap_set(ud->rflow_map_reserved, 0, ud->rchan_cnt);
+
+ /* Get resource ranges from tisci */
+ for (i = 0; i < RM_RANGE_LAST; i++)
+ tisci_rm->rm_ranges[i] =
+ devm_ti_sci_get_of_resource(ud->tisci, dev,
+ ud->tisci_dev_id,
+ (char *)range_names[i]);
+
+ /* tchan ranges */
+ rm_res = tisci_rm->rm_ranges[RM_RANGE_TCHAN];
+ if (IS_ERR(rm_res)) {
+ bitmap_zero(ud->tchan_map, ud->tchan_cnt);
+ } else {
+ bitmap_fill(ud->tchan_map, ud->tchan_cnt);
+ for (i = 0; i < rm_res->sets; i++) {
+ rm_desc = &rm_res->desc[i];
+ bitmap_clear(ud->tchan_map, rm_desc->start,
+ rm_desc->num);
+ }
+ }
+ /* rchan and matching default flow ranges */
+ rm_res = tisci_rm->rm_ranges[RM_RANGE_RCHAN];
+ if (IS_ERR(rm_res)) {
+ bitmap_zero(ud->rchan_map, ud->rchan_cnt);
+ bitmap_zero(ud->rflow_map, ud->rchan_cnt);
+ } else {
+ bitmap_fill(ud->rchan_map, ud->rchan_cnt);
+ bitmap_fill(ud->rflow_map, ud->rchan_cnt);
+ for (i = 0; i < rm_res->sets; i++) {
+ rm_desc = &rm_res->desc[i];
+ bitmap_clear(ud->rchan_map, rm_desc->start,
+ rm_desc->num);
+ bitmap_clear(ud->rflow_map, rm_desc->start,
+ rm_desc->num);
+ }
+ }
+
+ /* GP rflow ranges */
+ rm_res = tisci_rm->rm_ranges[RM_RANGE_RFLOW];
+ if (IS_ERR(rm_res)) {
+ bitmap_clear(ud->rflow_map, ud->rchan_cnt,
+ ud->rflow_cnt - ud->rchan_cnt);
+ } else {
+ bitmap_set(ud->rflow_map, ud->rchan_cnt,
+ ud->rflow_cnt - ud->rchan_cnt);
+ for (i = 0; i < rm_res->sets; i++) {
+ rm_desc = &rm_res->desc[i];
+ bitmap_clear(ud->rflow_map, rm_desc->start,
+ rm_desc->num);
+ }
+ }
+
+ ch_count -= bitmap_weight(ud->tchan_map, ud->tchan_cnt);
+ ch_count -= bitmap_weight(ud->rchan_map, ud->rchan_cnt);
+ if (!ch_count)
+ return -ENODEV;
+
+ ud->channels = devm_kcalloc(dev, ch_count, sizeof(*ud->channels),
+ GFP_KERNEL);
+ if (!ud->channels)
+ return -ENOMEM;
+
+ dev_info(dev,
+ "Channels: %d (tchan: %u, echan: %u, rchan: %u, rflow: %u)\n",
+ ch_count, ud->tchan_cnt, ud->echan_cnt, ud->rchan_cnt,
+ ud->rflow_cnt);
+
+ return ch_count;
+}
static int udma_probe(struct udevice *dev)
{
struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct udma_dev *ud = dev_get_priv(dev);
int i, ret;
- u32 cap2, cap3;
struct udevice *tmp;
struct udevice *tisci_dev = NULL;
@@ -1170,14 +1312,10 @@ static int udma_probe(struct udevice *dev)
ud->is_coherent = dev_read_bool(dev, "dma-coherent");
- cap2 = udma_read(ud->mmrs[MMR_GCFG], 0x28);
- cap3 = udma_read(ud->mmrs[MMR_GCFG], 0x2c);
-
- ud->rflow_cnt = cap3 & 0x3fff;
- ud->tchan_cnt = cap2 & 0x1ff;
- ud->echan_cnt = (cap2 >> 9) & 0x1ff;
- ud->rchan_cnt = (cap2 >> 18) & 0x1ff;
- ud->ch_count = ud->tchan_cnt + ud->rchan_cnt;
+ ud->dev = dev;
+ ud->ch_count = udma_setup_resources(ud);
+ if (ud->ch_count <= 0)
+ return ud->ch_count;
dev_info(dev,
"Number of channels: %u (tchan: %u, echan: %u, rchan: %u
dev-id %u)\n",
@@ -1187,21 +1325,8 @@ static int udma_probe(struct udevice *dev)
ud->channels = devm_kcalloc(dev, ud->ch_count, sizeof(*ud->channels),
GFP_KERNEL);
- ud->tchan_map = devm_kcalloc(dev, BITS_TO_LONGS(ud->tchan_cnt),
- sizeof(unsigned long), GFP_KERNEL);
- ud->tchans = devm_kcalloc(dev, ud->tchan_cnt,
- sizeof(*ud->tchans), GFP_KERNEL);
- ud->rchan_map = devm_kcalloc(dev, BITS_TO_LONGS(ud->rchan_cnt),
- sizeof(unsigned long), GFP_KERNEL);
- ud->rchans = devm_kcalloc(dev, ud->rchan_cnt,
- sizeof(*ud->rchans), GFP_KERNEL);
- ud->rflow_map = devm_kcalloc(dev, BITS_TO_LONGS(ud->rflow_cnt),
- sizeof(unsigned long), GFP_KERNEL);
- ud->rflows = devm_kcalloc(dev, ud->rflow_cnt,
- sizeof(*ud->rflows), GFP_KERNEL);
-
- if (!ud->channels || !ud->tchan_map || !ud->rchan_map ||
- !ud->rflow_map || !ud->tchans || !ud->rchans || !ud->rflows)
+
+ if (!ud->channels)
return -ENOMEM;
for (i = 0; i < ud->tchan_cnt; i++) {
--
2.24.0
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