[PATCH v2 17/17] dmaengine: ti: k3-udma-v2: Update glue layer to support PKTDMA V2

Sai Sree Kartheek Adivi
2025-06-12T07:54:45Z

Update glue layer to support PKTDMA V2 for non DMAengine users.

The updates include
- Handling absence of TISCI
- Direct IRQs
- Autopair: Lack of PSIL pair.

Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@ti.com>
---
drivers/dma/ti/k3-udma-glue.c | 91 ++++++++++++++++++++++----------
drivers/dma/ti/k3-udma-private.c | 48 +++++++++++++++--
drivers/dma/ti/k3-udma.h | 2 +
3 files changed, 110 insertions(+), 31 deletions(-)

diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c
index f87d244cc2d67..886d57dadacae 100644
--- a/drivers/dma/ti/k3-udma-glue.c
+++ b/drivers/dma/ti/k3-udma-glue.c
@@ -244,6 +244,9 @@ static int k3_udma_glue_cfg_tx_chn(struct k3_udma_glue_tx_channel *tx_chn)
const struct udma_tisci_rm *tisci_rm = tx_chn->common.tisci_rm;
struct ti_sci_msg_rm_udmap_tx_ch_cfg req;

+ if (!tisci_rm->tisci)
+ return 0;
+
memset(&req, 0, sizeof(req));

req.valid_params = TI_SCI_MSG_VALUE_RM_UDMAP_CH_PAUSE_ON_ERR_VALID |
@@ -502,21 +505,26 @@ int k3_udma_glue_enable_tx_chn(struct k3_udma_glue_tx_channel *tx_chn)
{
int ret;

- ret = xudma_navss_psil_pair(tx_chn->common.udmax,
- tx_chn->common.src_thread,
- tx_chn->common.dst_thread);
- if (ret) {
- dev_err(tx_chn->common.dev, "PSI-L request err %d\n", ret);
- return ret;
- }
+ if (tx_chn->common.udmax->match_data->type == DMA_TYPE_PKTDMA_V2) {
+ xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_CTL_REG,
+ UDMA_CHAN_RT_CTL_AUTOPAIR | UDMA_CHAN_RT_CTL_EN);
+ } else {
+ ret = xudma_navss_psil_pair(tx_chn->common.udmax,
+ tx_chn->common.src_thread,
+ tx_chn->common.dst_thread);
+ if (ret) {
+ dev_err(tx_chn->common.dev, "PSI-L request err %d\n", ret);
+ return ret;
+ }

- tx_chn->psil_paired = true;
+ tx_chn->psil_paired = true;

- xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_PEER_RT_EN_REG,
- UDMA_PEER_RT_EN_ENABLE);
+ xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_PEER_RT_EN_REG,
+ UDMA_PEER_RT_EN_ENABLE);

- xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_CTL_REG,
- UDMA_CHAN_RT_CTL_EN);
+ xudma_tchanrt_write(tx_chn->udma_tchanx, UDMA_CHAN_RT_CTL_REG,
+ UDMA_CHAN_RT_CTL_EN);
+ }

k3_udma_glue_dump_tx_rt_chn(tx_chn, "txchn en");
return 0;
@@ -682,7 +690,6 @@ static int k3_udma_glue_cfg_rx_chn(struct k3_udma_glue_rx_channel *rx_chn)
TI_SCI_MSG_VALUE_RM_UDMAP_CH_CHAN_TYPE_VALID |
TI_SCI_MSG_VALUE_RM_UDMAP_CH_ATYPE_VALID;

- req.nav_id = tisci_rm->tisci_dev_id;
req.index = rx_chn->udma_rchan_id;
req.rx_fetch_size = rx_chn->common.hdesc_size >> 2;
/*
@@ -702,11 +709,18 @@ static int k3_udma_glue_cfg_rx_chn(struct k3_udma_glue_rx_channel *rx_chn)
req.rx_chan_type = TI_SCI_RM_UDMAP_CHAN_TYPE_PKT_PBRR;
req.rx_atype = rx_chn->common.atype_asel;

+ if (!tisci_rm->tisci) {
+ // TODO: look at the chan settings
+ xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CFG_REG,
+ UDMA_CHAN_RT_CTL_TDOWN | UDMA_CHAN_RT_CTL_PAUSE);
+ return 0;
+ }
+
+ req.nav_id = tisci_rm->tisci_dev_id;
ret = tisci_rm->tisci_udmap_ops->rx_ch_cfg(tisci_rm->tisci, &req);
if (ret)
dev_err(rx_chn->common.dev, "rchan%d cfg failed %d\n",
- rx_chn->udma_rchan_id, ret);
-
+ rx_chn->udma_rchan_id, ret);
return ret;
}

@@ -755,8 +769,11 @@ static int k3_udma_glue_cfg_rx_flow(struct k3_udma_glue_rx_channel *rx_chn,
}

if (xudma_is_pktdma(rx_chn->common.udmax)) {
- rx_ringfdq_id = flow->udma_rflow_id +
+ if (tisci_rm->tisci)
+ rx_ringfdq_id = flow->udma_rflow_id +
xudma_get_rflow_ring_offset(rx_chn->common.udmax);
+ else
+ rx_ringfdq_id = flow->udma_rflow_id;
rx_ring_id = 0;
} else {
rx_ring_id = flow_cfg->ring_rxq_id;
@@ -803,6 +820,13 @@ static int k3_udma_glue_cfg_rx_flow(struct k3_udma_glue_rx_channel *rx_chn,
rx_ringfdq_id = k3_ringacc_get_ring_id(flow->ringrxfdq);
}

+ if (!tisci_rm->tisci) {
+ xudma_rflowrt_write(flow->udma_rflow, UDMA_RX_FLOWRT_RFA,
+ UDMA_CHAN_RT_CTL_TDOWN | UDMA_CHAN_RT_CTL_PAUSE);
+ rx_chn->flows_ready++;
+ return 0;
+ }
+
memset(&req, 0, sizeof(req));

req.valid_params =
@@ -1307,6 +1331,9 @@ int k3_udma_glue_rx_flow_enable(struct k3_udma_glue_rx_channel *rx_chn,
if (!rx_chn->remote)
return -EINVAL;

+ if (!tisci_rm->tisci)
+ return 0;
+
rx_ring_id = k3_ringacc_get_ring_id(flow->ringrx);
rx_ringfdq_id = k3_ringacc_get_ring_id(flow->ringrxfdq);

@@ -1348,6 +1375,9 @@ int k3_udma_glue_rx_flow_disable(struct k3_udma_glue_rx_channel *rx_chn,
if (!rx_chn->remote)
return -EINVAL;

+ if (!tisci_rm->tisci)
+ return 0;
+
memset(&req, 0, sizeof(req));
req.valid_params =
TI_SCI_MSG_VALUE_RM_UDMAP_FLOW_DEST_QNUM_VALID |
@@ -1383,21 +1413,26 @@ int k3_udma_glue_enable_rx_chn(struct k3_udma_glue_rx_channel *rx_chn)
if (rx_chn->flows_ready < rx_chn->flow_num)
return -EINVAL;

- ret = xudma_navss_psil_pair(rx_chn->common.udmax,
- rx_chn->common.src_thread,
- rx_chn->common.dst_thread);
- if (ret) {
- dev_err(rx_chn->common.dev, "PSI-L request err %d\n", ret);
- return ret;
- }
+ if (rx_chn->common.udmax->match_data->type == DMA_TYPE_PKTDMA_V2) {
+ xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CTL_REG,
+ UDMA_CHAN_RT_CTL_AUTOPAIR | UDMA_CHAN_RT_CTL_EN);
+ } else {
+ ret = xudma_navss_psil_pair(rx_chn->common.udmax,
+ rx_chn->common.src_thread,
+ rx_chn->common.dst_thread);
+ if (ret) {
+ dev_err(rx_chn->common.dev, "PSI-L request err %d\n", ret);
+ return ret;
+ }

- rx_chn->psil_paired = true;
+ rx_chn->psil_paired = true;

- xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CTL_REG,
- UDMA_CHAN_RT_CTL_EN);
+ xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_CTL_REG,
+ UDMA_CHAN_RT_CTL_EN);

- xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_PEER_RT_EN_REG,
- UDMA_PEER_RT_EN_ENABLE);
+ xudma_rchanrt_write(rx_chn->udma_rchanx, UDMA_CHAN_RT_PEER_RT_EN_REG,
+ UDMA_PEER_RT_EN_ENABLE);
+ }

k3_udma_glue_dump_rx_rt_chn(rx_chn, "rxrt en");
return 0;
diff --git a/drivers/dma/ti/k3-udma-private.c b/drivers/dma/ti/k3-udma-private.c
index 05228bf000333..5fccb8d18c898 100644
--- a/drivers/dma/ti/k3-udma-private.c
+++ b/drivers/dma/ti/k3-udma-private.c
@@ -3,18 +3,28 @@
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
*/
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_platform.h>

int xudma_navss_psil_pair(struct udma_dev *ud, u32 src_thread, u32 dst_thread)
{
- return navss_psil_pair(ud, src_thread, dst_thread);
+ if (IS_ENABLED(CONFIG_TI_K3_UDMA))
+ return navss_psil_pair(ud, src_thread, dst_thread);
+
+ return 0;
}
EXPORT_SYMBOL(xudma_navss_psil_pair);

int xudma_navss_psil_unpair(struct udma_dev *ud, u32 src_thread, u32 dst_thread)
{
- return navss_psil_unpair(ud, src_thread, dst_thread);
+ if (IS_ENABLED(CONFIG_TI_K3_UDMA))
+ return navss_psil_unpair(ud, src_thread, dst_thread);
+
+ return 0;
}
EXPORT_SYMBOL(xudma_navss_psil_unpair);

@@ -159,15 +169,32 @@ void xudma_##res##rt_write(struct udma_##res *p, int reg, u32 val) \
EXPORT_SYMBOL(xudma_##res##rt_write)
XUDMA_RT_IO_FUNCTIONS(tchan);
XUDMA_RT_IO_FUNCTIONS(rchan);
+XUDMA_RT_IO_FUNCTIONS(rflow);

int xudma_is_pktdma(struct udma_dev *ud)
{
- return ud->match_data->type == DMA_TYPE_PKTDMA;
+ return (ud->match_data->type == DMA_TYPE_PKTDMA ||
+ ud->match_data->type == DMA_TYPE_PKTDMA_V2);
}
EXPORT_SYMBOL(xudma_is_pktdma);

int xudma_pktdma_tflow_get_irq(struct udma_dev *ud, int udma_tflow_id)
{
+ if (ud->match_data->type == DMA_TYPE_PKTDMA_V2) {
+ __be32 addr[2] = {0, 0};
+ struct of_phandle_args out_irq;
+ int ret;
+
+ out_irq.np = dev_of_node(ud->dev);
+ out_irq.args_count = 1;
+ out_irq.args[0] = udma_tflow_id;
+ ret = of_irq_parse_raw(addr, &out_irq);
+ if (ret)
+ return ret;
+
+ return irq_create_of_mapping(&out_irq);
+ }
+
const struct udma_oes_offsets *oes = &ud->soc_data->oes;

return msi_get_virq(ud->dev, udma_tflow_id + oes->pktdma_tchan_flow);
@@ -176,6 +203,21 @@ EXPORT_SYMBOL(xudma_pktdma_tflow_get_irq);

int xudma_pktdma_rflow_get_irq(struct udma_dev *ud, int udma_rflow_id)
{
+ if (ud->match_data->type == DMA_TYPE_PKTDMA_V2) {
+ __be32 addr[2] = {0, 0};
+ struct of_phandle_args out_irq;
+ int ret;
+
+ out_irq.np = dev_of_node(ud->dev);
+ out_irq.args_count = 1;
+ out_irq.args[0] = udma_rflow_id;
+ ret = of_irq_parse_raw(addr, &out_irq);
+ if (ret)
+ return ret;
+
+ return irq_create_of_mapping(&out_irq);
+ }
+
const struct udma_oes_offsets *oes = &ud->soc_data->oes;

return msi_get_virq(ud->dev, udma_rflow_id + oes->pktdma_rchan_flow);
diff --git a/drivers/dma/ti/k3-udma.h b/drivers/dma/ti/k3-udma.h
index b54962601f1e2..fea1213f65fe0 100644
--- a/drivers/dma/ti/k3-udma.h
+++ b/drivers/dma/ti/k3-udma.h
@@ -736,6 +736,8 @@ u32 xudma_rchanrt_read(struct udma_rchan *rchan, int reg);
void xudma_rchanrt_write(struct udma_rchan *rchan, int reg, u32 val);
bool xudma_rflow_is_gp(struct udma_dev *ud, int id);
int xudma_get_rflow_ring_offset(struct udma_dev *ud);
+u32 xudma_rflowrt_read(struct udma_rflow *rflow, int reg);
+void xudma_rflowrt_write(struct udma_rflow *rflow, int reg, u32 val);

int xudma_is_pktdma(struct udma_dev *ud);

--
2.34.1