linux-kernel - [PATCH v2 2/8] iommu/tegra: gart: Provide access to Memory Controller driver

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Message-Id: <20180804143003.15817-3-digetx@gmail.com>
Date:   Sat,  4 Aug 2018 17:29:57 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/8] iommu/tegra: gart: Provide access to Memory Controller driver

GART contain registers needed by the Memory Controller driver, provide
access to the MC driver by utilizing its GART-integration facility.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/iommu/tegra-gart.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index a004f6da35f2..f8b653e25914 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -31,6 +31,8 @@
 #include <linux/iommu.h>
 #include <linux/of.h>
 
+#include <soc/tegra/mc.h>
+
 #include <asm/cacheflush.h>
 
 /* bitmap of the page sizes currently supported */
@@ -41,6 +43,8 @@
 #define GART_ENTRY_ADDR		(0x28 - GART_REG_BASE)
 #define GART_ENTRY_DATA		(0x2c - GART_REG_BASE)
 #define GART_ENTRY_PHYS_ADDR_VALID	(1 << 31)
+#define GART_ERROR_REQ		(0x30 - GART_REG_BASE)
+#define GART_ERROR_ADDR		(0x34 - GART_REG_BASE)
 
 #define GART_PAGE_SHIFT		12
 #define GART_PAGE_SIZE		(1 << GART_PAGE_SHIFT)
@@ -63,6 +67,8 @@ struct gart_device {
 	struct device		*dev;
 
 	struct iommu_device	iommu;		/* IOMMU Core handle */
+
+	struct tegra_mc_gart_handle mc_gart_handle;
 };
 
 struct gart_domain {
@@ -408,6 +414,20 @@ static int tegra_gart_resume(struct device *dev)
 	return 0;
 }
 
+static u32 tegra_gart_error_addr(struct tegra_mc_gart_handle *handle)
+{
+	struct gart_device *gart = container_of(handle, struct gart_device,
+						mc_gart_handle);
+	return readl_relaxed(gart->regs + GART_ERROR_ADDR);
+}
+
+static u32 tegra_gart_error_req(struct tegra_mc_gart_handle *handle)
+{
+	struct gart_device *gart = container_of(handle, struct gart_device,
+						mc_gart_handle);
+	return readl_relaxed(gart->regs + GART_ERROR_REQ);
+}
+
 static int tegra_gart_probe(struct platform_device *pdev)
 {
 	struct gart_device *gart;
@@ -464,6 +484,8 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	gart->regs = gart_regs;
 	gart->iovmm_base = (dma_addr_t)res_remap->start;
 	gart->page_count = (resource_size(res_remap) >> GART_PAGE_SHIFT);
+	gart->mc_gart_handle.error_addr = tegra_gart_error_addr;
+	gart->mc_gart_handle.error_req = tegra_gart_error_req;
 
 	gart->savedata = vmalloc(array_size(sizeof(u32), gart->page_count));
 	if (!gart->savedata) {
@@ -475,6 +497,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	do_gart_setup(gart, NULL);
 
 	gart_handle = gart;
+	tegra_mc_register_gart(&gart->mc_gart_handle);
 
 	return 0;
 }
-- 
2.18.0