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From:   Ashish Mhetre <amhetre@nvidia.com>
To:     <krzysztof.kozlowski@linaro.org>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <digetx@gmail.com>, <robh+dt@kernel.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <krzysztof.kozlowski+dt@linaro.org>
CC:     <vdumpa@nvidia.com>, <Snikam@nvidia.com>,
        Ashish Mhetre <amhetre@nvidia.com>
Subject: [Patch v6 1/4] memory: tegra: Add memory controller channels support
Date:   Wed, 6 Apr 2022 10:54:56 +0530
Message-ID: <20220406052459.10438-2-amhetre@nvidia.com>
In-Reply-To: <20220406052459.10438-1-amhetre@nvidia.com>
References: <20220406052459.10438-1-amhetre@nvidia.com>
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From tegra186 onwards, memory controller support multiple channels.
Add support for mapping address spaces of these channels.
Make sure that number of channels are as expected on each SOC.
During error interrupts from memory controller, appropriate registers
from these channels need to be accessed for logging error info.

Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
---
 drivers/memory/tegra/mc.c       |  6 ++++
 drivers/memory/tegra/tegra186.c | 54 +++++++++++++++++++++++++++++++++
 drivers/memory/tegra/tegra194.c |  1 +
 drivers/memory/tegra/tegra234.c |  1 +
 include/soc/tegra/mc.h          |  7 +++++
 5 files changed, 69 insertions(+)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index bf3abb6d8354..3cda1d9ad32a 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -749,6 +749,12 @@ static int tegra_mc_probe(struct platform_device *pdev)
 	if (IS_ERR(mc->regs))
 		return PTR_ERR(mc->regs);
 
+	if (mc->soc->ops && mc->soc->ops->map_regs) {
+		err = mc->soc->ops->map_regs(mc, pdev);
+		if (err < 0)
+			return err;
+	}
+
 	mc->debugfs.root = debugfs_create_dir("mc", NULL);
 
 	if (mc->soc->ops && mc->soc->ops->probe) {
diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 3d153881abc1..2ca8ce349188 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -139,11 +139,64 @@ static int tegra186_mc_probe_device(struct tegra_mc *mc, struct device *dev)
 	return 0;
 }
 
+static int tegra186_mc_map_regs(struct tegra_mc *mc,
+				struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.parent->of_node;
+	int num_dt_channels, reg_cells = 0;
+	int i, ret;
+	u32 val;
+
+	ret = of_property_read_u32(np, "#address-cells", &val);
+	if (ret) {
+		dev_err(&pdev->dev, "missing #address-cells property\n");
+		return ret;
+	}
+
+	reg_cells = val;
+
+	ret = of_property_read_u32(np, "#size-cells", &val);
+	if (ret) {
+		dev_err(&pdev->dev, "missing #size-cells property\n");
+		return ret;
+	}
+
+	reg_cells += val;
+
+	num_dt_channels = of_property_count_elems_of_size(pdev->dev.of_node, "reg",
+							  reg_cells * sizeof(u32));
+	/*
+	 * On tegra186 onwards, memory controller support multiple channels.
+	 * Apart from regular memory controller channels, there is one broadcast
+	 * channel and one for stream-id registers.
+	 */
+	if (num_dt_channels < mc->soc->num_channels + 2) {
+		dev_warn(&pdev->dev, "MC channels are missing, please update memory controller DT node with MC channels\n");
+		return 0;
+	}
+
+	mc->bcast_ch_regs = devm_platform_ioremap_resource_byname(pdev, "mc-broadcast");
+	if (IS_ERR(mc->bcast_ch_regs))
+		return PTR_ERR(mc->bcast_ch_regs);
+
+	for (i = 0; i < mc->soc->num_channels; i++) {
+		char name[4];
+
+		sprintf(name, "mc%u", i);
+		mc->ch_regs[i] = devm_platform_ioremap_resource_byname(pdev, name);
+		if (IS_ERR(mc->ch_regs[i]))
+			return PTR_ERR(mc->ch_regs[i]);
+	}
+
+	return 0;
+}
+
 const struct tegra_mc_ops tegra186_mc_ops = {
 	.probe = tegra186_mc_probe,
 	.remove = tegra186_mc_remove,
 	.resume = tegra186_mc_resume,
 	.probe_device = tegra186_mc_probe_device,
+	.map_regs = tegra186_mc_map_regs,
 };
 
 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
@@ -875,6 +928,7 @@ const struct tegra_mc_soc tegra186_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra186_mc_clients),
 	.clients = tegra186_mc_clients,
 	.num_address_bits = 40,
+	.num_channels = 4,
 	.ops = &tegra186_mc_ops,
 };
 #endif
diff --git a/drivers/memory/tegra/tegra194.c b/drivers/memory/tegra/tegra194.c
index cab998b8bd5c..94001174deaf 100644
--- a/drivers/memory/tegra/tegra194.c
+++ b/drivers/memory/tegra/tegra194.c
@@ -1347,5 +1347,6 @@ const struct tegra_mc_soc tegra194_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra194_mc_clients),
 	.clients = tegra194_mc_clients,
 	.num_address_bits = 40,
+	.num_channels = 16,
 	.ops = &tegra186_mc_ops,
 };
diff --git a/drivers/memory/tegra/tegra234.c b/drivers/memory/tegra/tegra234.c
index e22824a79f45..6335a132be2d 100644
--- a/drivers/memory/tegra/tegra234.c
+++ b/drivers/memory/tegra/tegra234.c
@@ -97,5 +97,6 @@ const struct tegra_mc_soc tegra234_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra234_mc_clients),
 	.clients = tegra234_mc_clients,
 	.num_address_bits = 40,
+	.num_channels = 16,
 	.ops = &tegra186_mc_ops,
 };
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 1066b1194a5a..c3c121fbfbb7 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -13,6 +13,9 @@
 #include <linux/irq.h>
 #include <linux/reset-controller.h>
 #include <linux/types.h>
+#include <linux/platform_device.h>
+
+#define MC_MAX_CHANNELS 16
 
 struct clk;
 struct device;
@@ -181,6 +184,7 @@ struct tegra_mc_ops {
 	int (*resume)(struct tegra_mc *mc);
 	irqreturn_t (*handle_irq)(int irq, void *data);
 	int (*probe_device)(struct tegra_mc *mc, struct device *dev);
+	int (*map_regs)(struct tegra_mc *mc, struct platform_device *pdev);
 };
 
 struct tegra_mc_soc {
@@ -194,6 +198,7 @@ struct tegra_mc_soc {
 	unsigned int atom_size;
 
 	u8 client_id_mask;
+	u8 num_channels;
 
 	const struct tegra_smmu_soc *smmu;
 
@@ -212,6 +217,8 @@ struct tegra_mc {
 	struct tegra_smmu *smmu;
 	struct gart_device *gart;
 	void __iomem *regs;
+	void __iomem *bcast_ch_regs;
+	void __iomem *ch_regs[MC_MAX_CHANNELS];
 	struct clk *clk;
 	int irq;
 
-- 
2.17.1