[PATCH 5/8] drivers: soc: ti: k3-ringacc: handle absence of tisci

Sai Sree Kartheek Adivi
2025-04-28T07:21:31Z

Handle absence of tisci with direct register writes. This will support
platforms that do not have tisci firmware like AM62L.

Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@ti.com>
---
drivers/soc/ti/k3-ringacc.c | 162 +++++++++++++++++++++++++-----
include/linux/soc/ti/k3-ringacc.h | 4 +
2 files changed, 142 insertions(+), 24 deletions(-)

diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c
index 82a15cad1c6c4..49e0483676a14 100644
--- a/drivers/soc/ti/k3-ringacc.c
+++ b/drivers/soc/ti/k3-ringacc.c
@@ -45,6 +45,38 @@ struct k3_ring_rt_regs {
u32 hwindx;
};

+#define K3_RINGACC_RT_CFG_REGS_OFS 0x40
+#define K3_DMARING_CFG_ADDR_HI_MASK GENMASK(3, 0)
+#define K3_DMARING_CFG_ASEL_SHIFT 16
+#define K3_DMARING_CFG_SIZE_MASK GENMASK(15, 0)
+
+/**
+ * struct k3_ring_cfg_regs - The RA Configuration Registers region
+ *
+ * @ba_lo: Ring Base Address Low Register
+ * @ba_hi: Ring Base Address High Register
+ * @size: Ring Size Register
+ */
+struct k3_ring_cfg_regs {
+ u32 ba_lo;
+ u32 ba_hi;
+ u32 size;
+};
+
+#define K3_RINGACC_RT_INT_REGS_OFS 0x140
+#define K3_RINGACC_RT_INT_ENABLE_SET_COMPLETE BIT(0)
+#define K3_RINGACC_RT_INT_ENABLE_SET_TR BIT(2)
+
+struct k3_ring_intr_regs {
+ u32 enable_set;
+ u32 resv_4;
+ u32 clr;
+ u32 resv_16;
+ u32 status_set;
+ u32 resv_8;
+ u32 status;
+};
+
#define K3_RINGACC_RT_REGS_STEP 0x1000
#define K3_DMARING_RT_REGS_STEP 0x2000
#define K3_DMARING_RT_REGS_REVERSE_OFS 0x1000
@@ -157,6 +189,8 @@ struct k3_ring_state {
*/
struct k3_ring {
struct k3_ring_rt_regs __iomem *rt;
+ struct k3_ring_cfg_regs __iomem *cfg;
+ struct k3_ring_intr_regs __iomem *intr;
struct k3_ring_fifo_regs __iomem *fifos;
struct k3_ringacc_proxy_target_regs __iomem *proxy;
dma_addr_t ring_mem_dma;
@@ -465,16 +499,30 @@ static void k3_ringacc_ring_reset_sci(struct k3_ring *ring)
struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
struct k3_ringacc *ringacc = ring->parent;
int ret;
+ u32 reg;

- ring_cfg.nav_id = ringacc->tisci_dev_id;
- ring_cfg.index = ring->ring_id;
- ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_COUNT_VALID;
- ring_cfg.count = ring->size;
+ if (!ringacc->tisci) {
+ if (ring->cfg == NULL)
+ return;
+ reg = readl(&ring->cfg->size);
+ reg &= ~K3_DMARING_CFG_SIZE_MASK;

- ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
- if (ret)
- dev_err(ringacc->dev, "TISCI reset ring fail (%d) ring_idx %d\n",
- ret, ring->ring_id);
+ writel(reg, &ring->cfg->size);
+ wmb();
+ reg |= ring->size;
+
+ writel(reg, &ring->cfg->size);
+ } else {
+ ring_cfg.nav_id = ringacc->tisci_dev_id;
+ ring_cfg.index = ring->ring_id;
+ ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_COUNT_VALID;
+ ring_cfg.count = ring->size;
+
+ ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
+ if (ret)
+ dev_err(ringacc->dev, "TISCI reset ring fail (%d) ring_idx %d\n",
+ ret, ring->ring_id);
+ }
}

void k3_ringacc_ring_reset(struct k3_ring *ring)
@@ -494,16 +542,30 @@ static void k3_ringacc_ring_reconfig_qmode_sci(struct k3_ring *ring,
struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
struct k3_ringacc *ringacc = ring->parent;
int ret;
+ u32 reg;

ring_cfg.nav_id = ringacc->tisci_dev_id;
ring_cfg.index = ring->ring_id;
ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_RING_MODE_VALID;
ring_cfg.mode = mode;

- ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
- if (ret)
- dev_err(ringacc->dev, "TISCI reconf qmode fail (%d) ring_idx %d\n",
- ret, ring->ring_id);
+ if (!ringacc->tisci) {
+ writel(ring_cfg.addr_lo, &ring->cfg->ba_lo);
+ writel((ring_cfg.addr_hi & K3_DMARING_CFG_ADDR_HI_MASK) +
+ (ring_cfg.asel << K3_DMARING_CFG_ASEL_SHIFT),
+ &ring->cfg->ba_hi);
+
+ reg = readl(&ring->cfg->size);
+ reg &= ~K3_DMARING_CFG_SIZE_MASK;
+ reg |= ring_cfg.count & K3_DMARING_CFG_SIZE_MASK;
+
+ writel(reg, &ring->cfg->size);
+ } else {
+ ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
+ if (ret)
+ dev_err(ringacc->dev, "TISCI reconf qmode fail (%d) ring_idx %d\n",
+ ret, ring->ring_id);
+ }
}

void k3_ringacc_ring_reset_dma(struct k3_ring *ring, u32 occ)
@@ -570,15 +632,29 @@ static void k3_ringacc_ring_free_sci(struct k3_ring *ring)
struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
struct k3_ringacc *ringacc = ring->parent;
int ret;
+ u32 reg;

ring_cfg.nav_id = ringacc->tisci_dev_id;
ring_cfg.index = ring->ring_id;
ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_ALL_NO_ORDER;

- ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
- if (ret)
- dev_err(ringacc->dev, "TISCI ring free fail (%d) ring_idx %d\n",
- ret, ring->ring_id);
+ if (!ringacc->tisci) {
+ writel(ring_cfg.addr_lo, &ring->cfg->ba_lo);
+ writel((ring_cfg.addr_hi & K3_DMARING_CFG_ADDR_HI_MASK) +
+ (ring_cfg.asel << K3_DMARING_CFG_ASEL_SHIFT),
+ &ring->cfg->ba_hi);
+
+ reg = readl(&ring->cfg->size);
+ reg &= ~K3_DMARING_CFG_SIZE_MASK;
+ reg |= ring_cfg.count & K3_DMARING_CFG_SIZE_MASK;
+
+ writel(reg, &ring->cfg->size);
+ } else {
+ ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
+ if (ret)
+ dev_err(ringacc->dev, "TISCI ring free fail (%d) ring_idx %d\n",
+ ret, ring->ring_id);
+ }
}

int k3_ringacc_ring_free(struct k3_ring *ring)
@@ -669,15 +745,31 @@ int k3_ringacc_get_ring_irq_num(struct k3_ring *ring)
}
EXPORT_SYMBOL_GPL(k3_ringacc_get_ring_irq_num);

+u32 k3_ringacc_ring_get_irq_status(struct k3_ring *ring)
+{
+ struct k3_ringacc *ringacc = ring->parent;
+ struct k3_ring *ring2 = &ringacc->rings[ring->ring_id];
+
+ return readl(&ring2->intr->status);
+}
+EXPORT_SYMBOL_GPL(k3_ringacc_ring_get_irq_status);
+
+void k3_ringacc_ring_clear_irq(struct k3_ring *ring)
+{
+ struct k3_ringacc *ringacc = ring->parent;
+ struct k3_ring *ring2 = &ringacc->rings[ring->ring_id];
+
+ writel(0xFF, &ring2->intr->status);
+}
+EXPORT_SYMBOL_GPL(k3_ringacc_ring_clear_irq);
+
static int k3_ringacc_ring_cfg_sci(struct k3_ring *ring)
{
struct ti_sci_msg_rm_ring_cfg ring_cfg = { 0 };
struct k3_ringacc *ringacc = ring->parent;
+ u32 reg;
int ret;

- if (!ringacc->tisci)
- return -EINVAL;
-
ring_cfg.nav_id = ringacc->tisci_dev_id;
ring_cfg.index = ring->ring_id;
ring_cfg.valid_params = TI_SCI_MSG_VALUE_RM_ALL_NO_ORDER;
@@ -688,11 +780,26 @@ static int k3_ringacc_ring_cfg_sci(struct k3_ring *ring)
ring_cfg.size = ring->elm_size;
ring_cfg.asel = ring->asel;

+ if (!ringacc->tisci) {
+ writel(ring_cfg.addr_lo, &ring->cfg->ba_lo);
+ writel((ring_cfg.addr_hi & K3_DMARING_CFG_ADDR_HI_MASK) +
+ (ring_cfg.asel << K3_DMARING_CFG_ASEL_SHIFT),
+ &ring->cfg->ba_hi);
+
+ reg = readl(&ring->cfg->size);
+ reg &= ~K3_DMARING_CFG_SIZE_MASK;
+ reg |= ring_cfg.count & K3_DMARING_CFG_SIZE_MASK;
+
+ writel(reg, &ring->cfg->size);
+ writel(K3_RINGACC_RT_INT_ENABLE_SET_COMPLETE | K3_RINGACC_RT_INT_ENABLE_SET_TR,
+ &ring->intr->enable_set);
+ return 0;
+ }
+
ret = ringacc->tisci_ring_ops->set_cfg(ringacc->tisci, &ring_cfg);
if (ret)
dev_err(ringacc->dev, "TISCI config ring fail (%d) ring_idx %d\n",
- ret, ring->ring_id);
-
+ ret, ring->ring_id);
return ret;
}

@@ -1480,9 +1587,12 @@ struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,

mutex_init(&ringacc->req_lock);

- base_rt = devm_platform_ioremap_resource_byname(pdev, "ringrt");
- if (IS_ERR(base_rt))
- return ERR_CAST(base_rt);
+ base_rt = data->base_rt;
+ if (!base_rt) {
+ base_rt = devm_platform_ioremap_resource_byname(pdev, "ringrt");
+ if (IS_ERR(base_rt))
+ return ERR_CAST(base_rt);
+ }

ringacc->rings = devm_kzalloc(dev,
sizeof(*ringacc->rings) *
@@ -1498,6 +1608,10 @@ struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
struct k3_ring *ring = &ringacc->rings[i];

ring->rt = base_rt + K3_DMARING_RT_REGS_STEP * i;
+ ring->cfg = base_rt + K3_RINGACC_RT_CFG_REGS_OFS +
+ K3_DMARING_RT_REGS_STEP * i;
+ ring->intr = base_rt + K3_RINGACC_RT_INT_REGS_OFS +
+ K3_DMARING_RT_REGS_STEP * i;
ring->parent = ringacc;
ring->ring_id = i;
ring->proxy_id = K3_RINGACC_PROXY_NOT_USED;
diff --git a/include/linux/soc/ti/k3-ringacc.h b/include/linux/soc/ti/k3-ringacc.h
index 39b022b925986..fcf6fbd4a8594 100644
--- a/include/linux/soc/ti/k3-ringacc.h
+++ b/include/linux/soc/ti/k3-ringacc.h
@@ -158,6 +158,9 @@ u32 k3_ringacc_get_ring_id(struct k3_ring *ring);
*/
int k3_ringacc_get_ring_irq_num(struct k3_ring *ring);

+u32 k3_ringacc_ring_get_irq_status(struct k3_ring *ring);
+void k3_ringacc_ring_clear_irq(struct k3_ring *ring);
+
/**
* k3_ringacc_ring_cfg - ring configure
* @ring: pointer on ring
@@ -262,6 +265,7 @@ struct k3_ringacc_init_data {
const struct ti_sci_handle *tisci;
u32 tisci_dev_id;
u32 num_rings;
+ void __iomem *base_rt;
};

struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
--
2.34.1