linux-kernel - [PATCH v10 3/6] remoteproc: pru: Add enum for PRU Core Indentifiers.

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Date:   Thu, 1 Dec 2022 16:34:57 +0530
From:   MD Danish Anwar <danishanwar@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Suman Anna <s-anna@...com>, Roger Quadros <rogerq@...nel.org>,
        "Andrew F . Davis" <afd@...com>, <nm@...com>, <vigneshr@...com>,
        <srk@...com>, <linux-remoteproc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        MD Danish Anwar <danishanwar@...com>
Subject: [PATCH v10 3/6] remoteproc: pru: Add enum for PRU Core Indentifiers.

Introducing enum pruss_pru_id for PRU Core Identifiers.
PRUSS_PRU0 indicates PRU Core 0.
PRUSS_PRU1 indicates PRU Core 1.
PRUSS_NUM_PRUS indicates the total number of PRU Cores.

Signed-off-by: MD Danish Anwar <danishanwar@...com>
---
 drivers/remoteproc/pru_rproc.c | 16 ++++++++++++----
 include/linux/pruss.h          | 19 +++++++++++++++++--
 2 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index b4498a505108..7d4ed39b3772 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -186,6 +186,7 @@ static struct rproc *__pru_rproc_get(struct device_node *np, int index)
  * pru_rproc_get() - get the PRU rproc instance from a device node
  * @np: the user/client device node
  * @index: index to use for the ti,prus property
+ * @pru_id: optional pointer to return the PRU remoteproc processor id
  *
  * This function looks through a client device node's "ti,prus" property at
  * index @index and returns the rproc handle for a valid PRU remote processor if
@@ -193,13 +194,17 @@ static struct rproc *__pru_rproc_get(struct device_node *np, int index)
  * time. Caller must call pru_rproc_put() when done with using the rproc, not
  * required if the function returns a failure.
  *
+ * When optional @pru_id pointer is passed the PRU remoteproc processor id is
+ * returned.
+ *
  * Return: rproc handle on success, and an ERR_PTR on failure using one
  * of the following error values
  *    -ENODEV if device is not found
  *    -EBUSY if PRU is already acquired by anyone
  *    -EPROBE_DEFER is PRU device is not probed yet
  */
-struct rproc *pru_rproc_get(struct device_node *np, int index)
+struct rproc *pru_rproc_get(struct device_node *np, int index,
+			    enum pruss_pru_id *pru_id)
 {
 	struct rproc *rproc;
 	struct pru_rproc *pru;
@@ -226,6 +231,9 @@ struct rproc *pru_rproc_get(struct device_node *np, int index)
 
 	mutex_unlock(&pru->lock);
 
+	if (pru_id)
+		*pru_id = pru->id;
+
 	return rproc;
 
 err_no_rproc_handle:
@@ -556,7 +564,7 @@ static void *pru_d_da_to_va(struct pru_rproc *pru, u32 da, size_t len)
 	dram0 = pruss->mem_regions[PRUSS_MEM_DRAM0];
 	dram1 = pruss->mem_regions[PRUSS_MEM_DRAM1];
 	/* PRU1 has its local RAM addresses reversed */
-	if (pru->id == 1)
+	if (pru->id == PRUSS_PRU1)
 		swap(dram0, dram1);
 	shrd_ram = pruss->mem_regions[PRUSS_MEM_SHRD_RAM2];
 
@@ -865,14 +873,14 @@ static int pru_rproc_set_id(struct pru_rproc *pru)
 	case RTU0_IRAM_ADDR_MASK:
 		fallthrough;
 	case PRU0_IRAM_ADDR_MASK:
-		pru->id = 0;
+		pru->id = PRUSS_PRU0;
 		break;
 	case TX_PRU1_IRAM_ADDR_MASK:
 		fallthrough;
 	case RTU1_IRAM_ADDR_MASK:
 		fallthrough;
 	case PRU1_IRAM_ADDR_MASK:
-		pru->id = 1;
+		pru->id = PRUSS_PRU1;
 		break;
 	default:
 		ret = -EINVAL;
diff --git a/include/linux/pruss.h b/include/linux/pruss.h
index 5c5d14b1249d..efe89c586b4b 100644
--- a/include/linux/pruss.h
+++ b/include/linux/pruss.h
@@ -14,17 +14,32 @@
 
 #define PRU_RPROC_DRVNAME "pru-rproc"
 
+/**
+ * enum pruss_pru_id - PRU core identifiers
+ * @PRUSS_PRU0: PRU Core 0.
+ * @PRUSS_PRU1: PRU Core 1.
+ * @PRUSS_NUM_PRUS: Total number of PRU Cores available.
+ *
+ */
+
+enum pruss_pru_id {
+	PRUSS_PRU0 = 0,
+	PRUSS_PRU1,
+	PRUSS_NUM_PRUS,
+};
+
 struct device_node;
 
 #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
 
-struct rproc *pru_rproc_get(struct device_node *np, int index);
+struct rproc *pru_rproc_get(struct device_node *np, int index,
+			    enum pruss_pru_id *pru_id);
 void pru_rproc_put(struct rproc *rproc);
 
 #else
 
 static inline struct rproc *
-pru_rproc_get(struct device_node *np, int index)
+pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id)
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
-- 
2.25.1