osi: common: Add API to check if MAC is enabled

Issue: RFE to check MAC enable status.

Fix: Export osi_is_mac_enabled API to check
for MAC status.

Bug 200646286
Bug 200671362

Change-Id: I26575c7c26095de3598197f5b800d3f1610a8bc9
Signed-off-by: Gaurav Asati <gasati@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/kernel/nvethernetrm/+/2397918
(cherry picked from commit a1b24b2524150aa4b3f60cdd00c08f97de875f1c)
Reviewed-on: https://git-master.nvidia.com/r/c/kernel/nvethernetrm/+/2405293
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

include/osi_core.h

@@ -333,7 +333,7 @@ struct osi_ptp_config {
 
 /**
  * @brief Max num of MAC core registers to backup. It should be max of or >=
- * (EQOS_MAX_BAK_IDX=380, MGBE_MAX_BAK_IDX, coreX,...etc) backup registers.
+ * (EQOS_MAX_BAK_IDX=380, coreX,...etc) backup registers.
  */
 #define CORE_MAX_BAK_IDX	700U
 

include/osi_dma.h

@@ -940,4 +940,17 @@ int osi_dma_get_systime_from_mac(
 			     unsigned int *sec,
 			     unsigned int *nsec);
 
+/**
+ * @brief osi_is_mac_enabled - Checks if MAC is enabled.
+ *
+ * Algorithm: Reads MAC MCR register for Tx and Rx enabled bits.
+ *
+ * @param[in] osi_dma: OSI DMA private data structure.
+ *
+ * @note MAC should be init and started. see osi_start_mac()
+ *
+ * @retval OSI_ENABLE if MAC enabled.
+ * @retval OSI_DISABLE otherwise.
+ */
+unsigned int osi_is_mac_enabled(struct osi_dma_priv_data *const osi_dma);
 #endif /* OSI_DMA_H */

osi/common/eqos_common.c

@@ -56,3 +56,17 @@ unsigned long long eqos_get_systime_from_mac(void *addr)
 
 	return ns;
 }
+
+unsigned int eqos_is_mac_enabled(void *addr)
+{
+	unsigned int enable = OSI_DISABLE;
+	unsigned int reg;
+
+	reg = osi_readl((unsigned char *)addr + EQOS_MAC_MCR);
+	if ((reg & (EQOS_MCR_TE | EQOS_MCR_RE)) ==
+		(EQOS_MCR_TE | EQOS_MCR_RE)) {
+		enable = OSI_ENABLE;
+	}
+
+	return enable;
+}

osi/common/eqos_common.h

@@ -34,6 +34,15 @@
 #define EQOS_MAC_STNSR_TSSS_MASK	0x7FFFFFFFU
 /** @} */
 
+/**
+ * @brief Common MAC MCR register and its bits
+ * @{
+ */
+#define EQOS_MAC_MCR			0x0000
+#define EQOS_MCR_TE			OSI_BIT(0)
+#define EQOS_MCR_RE			OSI_BIT(1)
+/** @} */
+
 /**
  * @brief eqos_get_systime - Get system time from MAC
  *
@@ -49,4 +58,18 @@
  */
 unsigned long long eqos_get_systime_from_mac(void *addr);
 
+/**
+ * @brief eqos_is_mac_enabled - Checks if MAC is enabled or not.
+ *
+ * Algorithm: Reads MAC MCR register for Tx and Rx enabled bits.
+ *
+ * @param[in] addr: Base address indicating the start of
+ *		    memory mapped IO region of the MAC.
+ *
+ * @note MAC should be init and started. see osi_start_mac()
+ *
+ * @retval OSI_ENABLE if MAC enabled.
+ * @retval OSI_DISABLE otherwise.
+ */
+unsigned int eqos_is_mac_enabled(void *addr);
 #endif /* EQOS_COMMON_H */

osi/common/include/local_common.h

@@ -43,4 +43,18 @@
 void common_get_systime_from_mac(void *addr, unsigned int mac,
 				 unsigned int *sec, unsigned int *nsec);
 
+/**
+ * @brief common_is_mac_enabled - Checks if MAC is enabled or not.
+ *
+ * Algorithm: Reads MAC register for Tx and Rx enabled bits.
+ *
+ * @param[in] addr: Address of base register.
+ * @param[in] mac: MAC HW type.
+ *
+ * @note MAC should be init and started. see osi_start_mac()
+ *
+ * @retval OSI_ENABLE if MAC enabled.
+ * @retval OSI_DISABLE otherwise.
+ */
+unsigned int common_is_mac_enabled(void *addr, unsigned int mac);
 #endif /* LOCAL_COMMON_H */

osi/common/osi_common.c

@@ -191,3 +191,13 @@ void common_get_systime_from_mac(void *addr, unsigned int mac,
 		/* do nothing here */
 	}
 }
+
+unsigned int common_is_mac_enabled(void *addr, unsigned int mac)
+{
+	if (mac == OSI_MAC_HW_EQOS) {
+		return eqos_is_mac_enabled(addr);
+	} else {
+		/* Non EQOS HW is supported yet */
+		return OSI_DISABLE;
+	}
+}

osi/dma/libnvethernetcl.export

@@ -42,3 +42,4 @@ osi_validate_dma_regs
 osi_config_slot_function
 osi_clear_tx_pkt_err_stats
 osi_dma_get_systime_from_mac
+osi_is_mac_enabled

osi/dma/osi_dma.c

@@ -426,3 +426,12 @@ int osi_dma_get_systime_from_mac(struct osi_dma_priv_data *const osi_dma,
 
 	return 0;
 }
+
+unsigned int osi_is_mac_enabled(struct osi_dma_priv_data *const osi_dma)
+{
+	if ((osi_dma != OSI_NULL) && (osi_dma->base != OSI_NULL)) {
+		return common_is_mac_enabled(osi_dma->base, osi_dma->mac);
+	} else {
+		return OSI_DISABLE;
+	}
+}