3 files changed, 76 insertions, 11 deletions

diff --git a/drivers/soc/fsl/qbman/bman_ccsr.c b/drivers/soc/fsl/qbman/bman_ccsr.c
index 7c3cc968053c..dc6d7e56be27 100644
--- a/drivers/soc/fsl/qbman/bman_ccsr.c
+++ b/drivers/soc/fsl/qbman/bman_ccsr.c
@@ -97,17 +97,40 @@ static void bm_get_version(u16 *id, u8 *major, u8 *minor)
 /* signal transactions for FBPRs with higher priority */
 #define FBPR_AR_RPRIO_HI BIT(30)
 
-static void bm_set_memory(u64 ba, u32 size)
+/* Track if probe has occurred and if cleanup is required */
+static int __bman_probed;
+static int __bman_requires_cleanup;
+
+
+static int bm_set_memory(u64 ba, u32 size)
 {
+	u32 bar, bare;
 	u32 exp = ilog2(size);
 	/* choke if size isn't within range */
 	DPAA_ASSERT(size >= 4096 && size <= 1024*1024*1024 &&
 		   is_power_of_2(size));
 	/* choke if '[e]ba' has lower-alignment than 'size' */
 	DPAA_ASSERT(!(ba & (size - 1)));
+
+	/* Check to see if BMan has already been initialized */
+	bar = bm_ccsr_in(REG_FBPR_BAR);
+	if (bar) {
+		/* Maker sure ba == what was programmed) */
+		bare = bm_ccsr_in(REG_FBPR_BARE);
+		if (bare != upper_32_bits(ba) || bar != lower_32_bits(ba)) {
+			pr_err("Attempted to reinitialize BMan with different BAR, got 0x%llx read BARE=0x%x BAR=0x%x\n",
+			       ba, bare, bar);
+			return -ENOMEM;
+		}
+		pr_info("BMan BAR already configured\n");
+		__bman_requires_cleanup = 1;
+		return 1;
+	}
+
 	bm_ccsr_out(REG_FBPR_BARE, upper_32_bits(ba));
 	bm_ccsr_out(REG_FBPR_BAR, lower_32_bits(ba));
 	bm_ccsr_out(REG_FBPR_AR, exp - 1);
+	return 0;
 }
 
 /*
@@ -120,7 +143,6 @@ static void bm_set_memory(u64 ba, u32 size)
  */
 static dma_addr_t fbpr_a;
 static size_t fbpr_sz;
-static int __bman_probed;
 
 static int bman_fbpr(struct reserved_mem *rmem)
 {
diff --git a/drivers/soc/fsl/qbman/dpaa_sys.c b/drivers/soc/fsl/qbman/dpaa_sys.c
index e6d48dccb8d5..3e0a7f311693 100644
--- a/drivers/soc/fsl/qbman/dpaa_sys.c
+++ b/drivers/soc/fsl/qbman/dpaa_sys.c
@@ -40,6 +40,7 @@ int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
 	int ret;
 	struct device_node *mem_node;
 	u64 size64;
+	struct reserved_mem *rmem;
 
 	ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, idx);
 	if (ret) {
@@ -62,10 +63,8 @@ int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
 		return -ENODEV;
 	}
 
-	if (!dma_alloc_coherent(dev, *size, addr, 0)) {
-		dev_err(dev, "DMA Alloc memory failed\n");
-		return -ENODEV;
-	}
+	rmem = of_reserved_mem_lookup(mem_node);
+	*addr = rmem->base;
 
 	/*
 	 * Disassociate the reserved memory area from the device
diff --git a/drivers/soc/fsl/qbman/qman_ccsr.c b/drivers/soc/fsl/qbman/qman_ccsr.c
index a6bb43007d03..a3edefa792f8 100644
--- a/drivers/soc/fsl/qbman/qman_ccsr.c
+++ b/drivers/soc/fsl/qbman/qman_ccsr.c
@@ -274,6 +274,7 @@ static u32 __iomem *qm_ccsr_start;
 /* A SDQCR mask comprising all the available/visible pool channels */
 static u32 qm_pools_sdqcr;
 static int __qman_probed;
+static int  __qman_requires_cleanup;
 
 static inline u32 qm_ccsr_in(u32 offset)
 {
@@ -340,19 +341,55 @@ static void qm_get_version(u16 *id, u8 *major, u8 *minor)
 }
 
 #define PFDR_AR_EN		BIT(31)
-static void qm_set_memory(enum qm_memory memory, u64 ba, u32 size)
+static int qm_set_memory(enum qm_memory memory, u64 ba, u32 size)
 {
+	void *ptr;
 	u32 offset = (memory == qm_memory_fqd) ? REG_FQD_BARE : REG_PFDR_BARE;
 	u32 exp = ilog2(size);
+	u32 bar, bare;
 
 	/* choke if size isn't within range */
 	DPAA_ASSERT((size >= 4096) && (size <= 1024*1024*1024) &&
 		    is_power_of_2(size));
 	/* choke if 'ba' has lower-alignment than 'size' */
 	DPAA_ASSERT(!(ba & (size - 1)));
+
+	/* Check to see if QMan has already been initialized */
+	bar = qm_ccsr_in(offset + REG_offset_BAR);
+	if (bar) {
+		/* Maker sure ba == what was programmed) */
+		bare = qm_ccsr_in(offset);
+		if (bare != upper_32_bits(ba) || bar != lower_32_bits(ba)) {
+			pr_err("Attempted to reinitialize QMan with different BAR, got 0x%llx read BARE=0x%x BAR=0x%x\n",
+			       ba, bare, bar);
+			return -ENOMEM;
+		}
+		__qman_requires_cleanup = 1;
+		/* Return 1 to indicate memory was previously programmed */
+		return 1;
+	}
+	/* Need to temporarily map the area to make sure it is zeroed */
+	ptr = memremap(ba, size, MEMREMAP_WB);
+	if (!ptr) {
+		pr_crit("memremap() of QMan private memory failed\n");
+		return -ENOMEM;
+	}
+	memset(ptr, 0, size);
+
+#ifdef CONFIG_PPC
+	/*
+	 * PPC doesn't appear to flush the cache on memunmap() but the
+	 * cache must be flushed since QMan does non coherent accesses
+	 * to this memory
+	 */
+	flush_dcache_range((unsigned long) ptr, (unsigned long) ptr+size);
+#endif
+	memunmap(ptr);
+
 	qm_ccsr_out(offset, upper_32_bits(ba));
 	qm_ccsr_out(offset + REG_offset_BAR, lower_32_bits(ba));
 	qm_ccsr_out(offset + REG_offset_AR, PFDR_AR_EN | (exp - 1));
+	return 0;
 }
 
 static void qm_set_pfdr_threshold(u32 th, u8 k)
@@ -571,12 +608,19 @@ static int qman_init_ccsr(struct device *dev)
 	int i, err;
 
 	/* FQD memory */
-	qm_set_memory(qm_memory_fqd, fqd_a, fqd_sz);
+	err = qm_set_memory(qm_memory_fqd, fqd_a, fqd_sz);
+	if (err < 0)
+		return err;
 	/* PFDR memory */
-	qm_set_memory(qm_memory_pfdr, pfdr_a, pfdr_sz);
-	err = qm_init_pfdr(dev, 8, pfdr_sz / 64 - 8);
-	if (err)
+	err = qm_set_memory(qm_memory_pfdr, pfdr_a, pfdr_sz);
+	if (err < 0)
 		return err;
+	/* Only initialize PFDRs if the QMan was not initialized before */
+	if (err == 0) {
+		err = qm_init_pfdr(dev, 8, pfdr_sz / 64 - 8);
+		if (err)
+			return err;
+	}
 	/* thresholds */
 	qm_set_pfdr_threshold(512, 64);
 	qm_set_sfdr_threshold(128);