openwrt/target/linux/layerscape/patches-5.4/701-net-0149-soc-fsl-dpio-change-CENA-regs-to-be-cacheable.patch

From e2b0ebb44e91e3492f26d21218fb7ea5e14190ec Mon Sep 17 00:00:00 2001
From: Haiying Wang <[email protected]>
Date: Thu, 20 Apr 2017 11:54:22 -0400
Subject: [PATCH] soc: fsl: dpio: change CENA regs to be cacheable

Change cache enabled regsiter accessed to be cacheable
plus non-shareable to meet the performance requirement.
QMan's CENA region contains registers and structures that
are 64byte in size and are inteneded to be accessed using a
single 64 byte bus transaction, therefore this portal
memory should be configured as cache-enabled. Also because
the write allocate stash transcations of QBMan should be
issued as cachable and non-coherent(non-sharable), we
need to configure this region to be non-shareable.

Signed-off-by: Haiying Wang <[email protected]>
---
 drivers/soc/fsl/dpio/dpio-driver.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

--- a/drivers/soc/fsl/dpio/dpio-driver.c
+++ b/drivers/soc/fsl/dpio/dpio-driver.c
@@ -27,6 +27,11 @@ MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Freescale Semiconductor, Inc");
 MODULE_DESCRIPTION("DPIO Driver");
 
+#define PROT_NORMAL_NS		(PTE_TYPE_PAGE | PTE_AF | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
+
+#define ioremap_cache_ns(addr, size)	__ioremap((addr), (size), __pgprot(PROT_NORMAL_NS))
+
+
 struct dpio_priv {
 	struct dpaa2_io *io;
 };
@@ -197,13 +202,11 @@ static int dpaa2_dpio_probe(struct fsl_m
 	if (dpio_dev->obj_desc.region_count < 3) {
 		/* No support for DDR backed portals, use classic mapping */
 		/*
-		 * Set the CENA regs to be the cache inhibited area of the
-		 * portal to avoid coherency issues if a user migrates to
-		 * another core.
+		 * Set the CENA regs to be the cache enabled area of the portal to
+		 * achieve the best performance.
 		 */
-		desc.regs_cena = devm_memremap(dev, dpio_dev->regions[1].start,
-					resource_size(&dpio_dev->regions[1]),
-					MEMREMAP_WC);
+		desc.regs_cena = ioremap_cache_ns(dpio_dev->regions[0].start,
+						resource_size(&dpio_dev->regions[0]));
 	} else {
 		desc.regs_cena = devm_memremap(dev, dpio_dev->regions[2].start,
 					resource_size(&dpio_dev->regions[2]),
@@ -211,7 +214,7 @@ static int dpaa2_dpio_probe(struct fsl_m
 	}
 
 	if (IS_ERR(desc.regs_cena)) {
-		dev_err(dev, "devm_memremap failed\n");
+		dev_err(dev, "ioremap_cache_ns failed\n");
 		err = PTR_ERR(desc.regs_cena);
 		goto err_allocate_irqs;
 	}