[PATCH v7 12/19] drivers: soc: ti: k3-ringacc: handle absence of tisci

[Sai Sree Kartheek Adivi <s-adivi@ti.com>]

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       | 188 ++++++++++++++++++++++++++----
 include/linux/soc/ti/k3-ringacc.h |  17 +++
 2 files changed, 181 insertions(+), 24 deletions(-)

diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c
index 5966db4327b13..e81d19a9ed324 100644
--- a/drivers/soc/ti/k3-ringacc.c
+++ b/drivers/soc/ti/k3-ringacc.c
@@ -46,6 +46,53 @@ 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 {
+ *
+ * @enable_set: Ring Interrupt Enable Register
+ * @resv_1: Reserved
+ * @clr: Ring Interrupt Clear Register
+ * @resv_2: Reserved
+ * @status_set: Ring Interrupt Status Set Register
+ * @resv_3: Reserved
+ * @status: Ring Interrupt Status Register
+ * @resv_4: Reserved
+ * @status_masked: Ring Interrupt Status Masked Register
+ */
+struct k3_ring_intr_regs {
+	u32	enable_set;
+	u32	resv_1;
+	u32	clr;
+	u32	resv_2;
+	u32	status_set;
+	u32	resv_3;
+	u32	status;
+	u32	resv_4;
+	u32	status_masked;
+};
+
 #define K3_RINGACC_RT_REGS_STEP			0x1000
 #define K3_DMARING_RT_REGS_STEP			0x2000
 #define K3_DMARING_RT_REGS_REVERSE_OFS		0x1000
@@ -139,6 +186,8 @@ struct k3_ring_state {
  * struct k3_ring - RA Ring descriptor
  *
  * @rt: Ring control/status registers
+ * @cfg: Ring config registers
+ * @intr: Ring interrupt registers
  * @fifos: Ring queues registers
  * @proxy: Ring Proxy Datapath registers
  * @ring_mem_dma: Ring buffer dma address
@@ -158,6 +207,8 @@ 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;
@@ -467,15 +518,31 @@ static void k3_ringacc_ring_reset_sci(struct k3_ring *ring)
 	struct k3_ringacc *ringacc = ring->parent;
 	int ret;
 
-	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) {
+		u32 reg;
 
-	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);
+		if (!ring->cfg)
+			return;
+
+		reg = readl(&ring->cfg->size);
+		reg &= ~K3_DMARING_CFG_SIZE_MASK;
+		writel(reg, &ring->cfg->size);
+
+		/* Ensure the register clear operation completes before writing new value */
+		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)
@@ -501,10 +568,25 @@ static void k3_ringacc_ring_reconfig_qmode_sci(struct k3_ring *ring,
 	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) {
+		u32 reg;
+
+		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)
@@ -576,10 +658,25 @@ static void k3_ringacc_ring_free_sci(struct k3_ring *ring)
 	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) {
+		u32 reg;
+
+		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)
@@ -670,15 +767,30 @@ 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;
 	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;
@@ -689,6 +801,24 @@ 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) {
+		u32 reg;
+
+		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",
@@ -1347,8 +1477,11 @@ static int k3_ringacc_probe_dt(struct k3_ringacc *ringacc)
 		return PTR_ERR(ringacc->rm_gp_range);
 	}
 
-	return ti_sci_inta_msi_domain_alloc_irqs(ringacc->dev,
-						 ringacc->rm_gp_range);
+	if (IS_ENABLED(CONFIG_TI_K3_UDMA))
+		return ti_sci_inta_msi_domain_alloc_irqs(ringacc->dev,
+			ringacc->rm_gp_range);
+	else
+		return 0;
 }
 
 static const struct k3_ringacc_soc_data k3_ringacc_soc_data_sr1 = {
@@ -1481,9 +1614,12 @@ 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) *
@@ -1499,6 +1635,10 @@ 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..9f2d141c988bd 100644
--- a/include/linux/soc/ti/k3-ringacc.h
+++ b/include/linux/soc/ti/k3-ringacc.h
@@ -158,6 +158,22 @@ u32 k3_ringacc_get_ring_id(struct k3_ring *ring);
  */
 int k3_ringacc_get_ring_irq_num(struct k3_ring *ring);
 
+/**
+ * k3_ringacc_ring_get_irq_status - Get the irq status for the ring
+ * @ring: pointer on ring
+ *
+ * Returns the interrupt status
+ */
+u32 k3_ringacc_ring_get_irq_status(struct k3_ring *ring);
+
+/**
+ * k3_ringacc_ring_clear_irq - Clear all interrupts
+ * @ring: pointer on ring
+ *
+ * Clears all the interrupts on the ring
+ */
+void k3_ringacc_ring_clear_irq(struct k3_ring *ring);
+
 /**
  * k3_ringacc_ring_cfg - ring configure
  * @ring: pointer on ring
@@ -262,6 +278,7 @@ 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,
-- 
2.54.0