memory: Add NVIDIA Tegra memory controller support

The memory controller on NVIDIA Tegra exposes various knobs that can be
used to tune the behaviour of the clients attached to it.

Currently this driver sets up the latency allowance registers to the HW
defaults. Eventually an API should be exported by this driver (via a
custom API or a generic subsystem) to allow clients to register latency
requirements.

This driver also registers an IOMMU (SMMU) that's implemented by the
memory controller. It is supported on Tegra30, Tegra114 and Tegra124
currently. Tegra20 has a GART instead.

The Tegra SMMU operates on memory clients and SWGROUPs. A memory client
is a unidirectional, special-purpose DMA master. A SWGROUP represents a
set of memory clients that form a logical functional unit corresponding
to a single device. Typically a device has two clients: one client for
read transactions and one client for write transactions, but there are
also devices that have only read clients, but many of them (such as the
display controllers).

Because there is no 1:1 relationship between memory clients and devices
the driver keeps a table of memory clients and the SWGROUPs that they
belong to per SoC. Note that this is an exception and due to the fact
that the SMMU is tightly integrated with the rest of the Tegra SoC. The
use of these tables is discouraged in drivers for generic IOMMU devices
such as the ARM SMMU because the same IOMMU could be used in any number
of SoCs and keeping such tables for each SoC would not scale.
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/iommu/Kconfig

@@ -163,14 +163,14 @@ config TEGRA_IOMMU_GART
 	  hardware included on Tegra SoCs.
 
 config TEGRA_IOMMU_SMMU
-	bool "Tegra SMMU IOMMU Support"
-	depends on ARCH_TEGRA && TEGRA_AHB
+	bool "NVIDIA Tegra SMMU Support"
+	depends on ARCH_TEGRA
+	depends on TEGRA_AHB
+	depends on TEGRA_MC
 	select IOMMU_API
 	help
-	  Enables support for remapping discontiguous physical memory
-	  shared with the operating system into contiguous I/O virtual
-	  space through the SMMU (System Memory Management Unit)
-	  hardware included on Tegra SoCs.
+	  This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
+	  SoCs (Tegra30 up to Tegra124).
 
 config EXYNOS_IOMMU
 	bool "Exynos IOMMU Support"

drivers/memory/Kconfig

@@ -61,16 +61,6 @@ config TEGRA20_MC
 	  analysis, especially for IOMMU/GART(Graphics Address
 	  Relocation Table) module.
 
-config TEGRA30_MC
-	bool "Tegra30 Memory Controller(MC) driver"
-	default y
-	depends on ARCH_TEGRA_3x_SOC
-	help
-	  This driver is for the Memory Controller(MC) module available
-	  in Tegra30 SoCs, mainly for a address translation fault
-	  analysis, especially for IOMMU/SMMU(System Memory Management
-	  Unit) module.
-
 config FSL_CORENET_CF
 	tristate "Freescale CoreNet Error Reporting"
 	depends on FSL_SOC_BOOKE
@@ -85,4 +75,6 @@ config FSL_IFC
 	bool
 	depends on FSL_SOC
 
+source "drivers/memory/tegra/Kconfig"
+
 endif

drivers/memory/Makefile

@@ -12,4 +12,5 @@ obj-$(CONFIG_FSL_CORENET_CF)	+= fsl-corenet-cf.o
 obj-$(CONFIG_FSL_IFC)		+= fsl_ifc.o
 obj-$(CONFIG_MVEBU_DEVBUS)	+= mvebu-devbus.o
 obj-$(CONFIG_TEGRA20_MC)	+= tegra20-mc.o
-obj-$(CONFIG_TEGRA30_MC)	+= tegra30-mc.o
+
+obj-$(CONFIG_TEGRA_MC)		+= tegra/

drivers/memory/tegra/Kconfig

+config TEGRA_MC
+	bool "NVIDIA Tegra Memory Controller support"
+	default y
+	depends on ARCH_TEGRA
+	help
+	  This driver supports the Memory Controller (MC) hardware found on
+	  NVIDIA Tegra SoCs.

drivers/memory/tegra/Makefile

+tegra-mc-y := mc.o
+
+tegra-mc-$(CONFIG_ARCH_TEGRA_3x_SOC)  += tegra30.o
+tegra-mc-$(CONFIG_ARCH_TEGRA_114_SOC) += tegra114.o
+tegra-mc-$(CONFIG_ARCH_TEGRA_124_SOC) += tegra124.o
+
+obj-$(CONFIG_TEGRA_MC) += tegra-mc.o

drivers/memory/tegra/mc.c

+/*
+ * Copyright (C) 2014 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "mc.h"
+
+#define MC_INTSTATUS 0x000
+#define  MC_INT_DECERR_MTS (1 << 16)
+#define  MC_INT_SECERR_SEC (1 << 13)
+#define  MC_INT_DECERR_VPR (1 << 12)
+#define  MC_INT_INVALID_APB_ASID_UPDATE (1 << 11)
+#define  MC_INT_INVALID_SMMU_PAGE (1 << 10)
+#define  MC_INT_ARBITRATION_EMEM (1 << 9)
+#define  MC_INT_SECURITY_VIOLATION (1 << 8)
+#define  MC_INT_DECERR_EMEM (1 << 6)
+
+#define MC_INTMASK 0x004
+
+#define MC_ERR_STATUS 0x08
+#define  MC_ERR_STATUS_TYPE_SHIFT 28
+#define  MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE (6 << MC_ERR_STATUS_TYPE_SHIFT)
+#define  MC_ERR_STATUS_TYPE_MASK (0x7 << MC_ERR_STATUS_TYPE_SHIFT)
+#define  MC_ERR_STATUS_READABLE (1 << 27)
+#define  MC_ERR_STATUS_WRITABLE (1 << 26)
+#define  MC_ERR_STATUS_NONSECURE (1 << 25)
+#define  MC_ERR_STATUS_ADR_HI_SHIFT 20
+#define  MC_ERR_STATUS_ADR_HI_MASK 0x3
+#define  MC_ERR_STATUS_SECURITY (1 << 17)
+#define  MC_ERR_STATUS_RW (1 << 16)
+#define  MC_ERR_STATUS_CLIENT_MASK 0x7f
+
+#define MC_ERR_ADR 0x0c
+
+#define MC_EMEM_ARB_CFG 0x90
+#define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(x)	(((x) & 0x1ff) << 0)
+#define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK	0x1ff
+#define MC_EMEM_ARB_MISC0 0xd8
+
+static const struct of_device_id tegra_mc_of_match[] = {
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+	{ .compatible = "nvidia,tegra30-mc", .data = &tegra30_mc_soc },
+#endif
+#ifdef CONFIG_ARCH_TEGRA_114_SOC
+	{ .compatible = "nvidia,tegra114-mc", .data = &tegra114_mc_soc },
+#endif
+#ifdef CONFIG_ARCH_TEGRA_124_SOC
+	{ .compatible = "nvidia,tegra124-mc", .data = &tegra124_mc_soc },
+#endif
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tegra_mc_of_match);
+
+static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc)
+{
+	unsigned long long tick;
+	unsigned int i;
+	u32 value;
+
+	/* compute the number of MC clock cycles per tick */
+	tick = mc->tick * clk_get_rate(mc->clk);
+	do_div(tick, NSEC_PER_SEC);
+
+	value = readl(mc->regs + MC_EMEM_ARB_CFG);
+	value &= ~MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK;
+	value |= MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(tick);
+	writel(value, mc->regs + MC_EMEM_ARB_CFG);
+
+	/* write latency allowance defaults */
+	for (i = 0; i < mc->soc->num_clients; i++) {
+		const struct tegra_mc_la *la = &mc->soc->clients[i].la;
+		u32 value;
+
+		value = readl(mc->regs + la->reg);
+		value &= ~(la->mask << la->shift);
+		value |= (la->def & la->mask) << la->shift;
+		writel(value, mc->regs + la->reg);
+	}
+
+	return 0;
+}
+
+static const char *const status_names[32] = {
+	[ 1] = "External interrupt",
+	[ 6] = "EMEM address decode error",
+	[ 8] = "Security violation",
+	[ 9] = "EMEM arbitration error",
+	[10] = "Page fault",
+	[11] = "Invalid APB ASID update",
+	[12] = "VPR violation",
+	[13] = "Secure carveout violation",
+	[16] = "MTS carveout violation",
+};
+
+static const char *const error_names[8] = {
+	[2] = "EMEM decode error",
+	[3] = "TrustZone violation",
+	[4] = "Carveout violation",
+	[6] = "SMMU translation error",
+};
+
+static irqreturn_t tegra_mc_irq(int irq, void *data)
+{
+	struct tegra_mc *mc = data;
+	unsigned long status, mask;
+	unsigned int bit;
+
+	/* mask all interrupts to avoid flooding */
+	status = mc_readl(mc, MC_INTSTATUS);
+	mask = mc_readl(mc, MC_INTMASK);
+
+	for_each_set_bit(bit, &status, 32) {
+		const char *error = status_names[bit] ?: "unknown";
+		const char *client = "unknown", *desc;
+		const char *direction, *secure;
+		phys_addr_t addr = 0;
+		unsigned int i;
+		char perm[7];
+		u8 id, type;
+		u32 value;
+
+		value = mc_readl(mc, MC_ERR_STATUS);
+
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+		if (mc->soc->num_address_bits > 32) {
+			addr = ((value >> MC_ERR_STATUS_ADR_HI_SHIFT) &
+				MC_ERR_STATUS_ADR_HI_MASK);
+			addr <<= 32;
+		}
+#endif
+
+		if (value & MC_ERR_STATUS_RW)
+			direction = "write";
+		else
+			direction = "read";
+
+		if (value & MC_ERR_STATUS_SECURITY)
+			secure = "secure ";
+		else
+			secure = "";
+
+		id = value & MC_ERR_STATUS_CLIENT_MASK;
+
+		for (i = 0; i < mc->soc->num_clients; i++) {
+			if (mc->soc->clients[i].id == id) {
+				client = mc->soc->clients[i].name;
+				break;
+			}
+		}
+
+		type = (value & MC_ERR_STATUS_TYPE_MASK) >>
+		       MC_ERR_STATUS_TYPE_SHIFT;
+		desc = error_names[type];
+
+		switch (value & MC_ERR_STATUS_TYPE_MASK) {
+		case MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE:
+			perm[0] = ' ';
+			perm[1] = '[';
+
+			if (value & MC_ERR_STATUS_READABLE)
+				perm[2] = 'R';
+			else
+				perm[2] = '-';
+
+			if (value & MC_ERR_STATUS_WRITABLE)
+				perm[3] = 'W';
+			else
+				perm[3] = '-';
+
+			if (value & MC_ERR_STATUS_NONSECURE)
+				perm[4] = '-';
+			else
+				perm[4] = 'S';
+
+			perm[5] = ']';
+			perm[6] = '\0';
+			break;
+
+		default:
+			perm[0] = '\0';
+			break;
+		}
+
+		value = mc_readl(mc, MC_ERR_ADR);
+		addr |= value;
+
+		dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s%s)\n",
+				    client, secure, direction, &addr, error,
+				    desc, perm);
+	}
+
+	/* clear interrupts */
+	mc_writel(mc, status, MC_INTSTATUS);
+
+	return IRQ_HANDLED;
+}
+
+static int tegra_mc_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	struct resource *res;
+	struct tegra_mc *mc;
+	u32 value;
+	int err;
+
+	match = of_match_node(tegra_mc_of_match, pdev->dev.of_node);
+	if (!match)
+		return -ENODEV;
+
+	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
+	if (!mc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mc);
+	mc->soc = match->data;
+	mc->dev = &pdev->dev;
+
+	/* length of MC tick in nanoseconds */
+	mc->tick = 30;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mc->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mc->regs))
+		return PTR_ERR(mc->regs);
+
+	mc->clk = devm_clk_get(&pdev->dev, "mc");
+	if (IS_ERR(mc->clk)) {
+		dev_err(&pdev->dev, "failed to get MC clock: %ld\n",
+			PTR_ERR(mc->clk));
+		return PTR_ERR(mc->clk);
+	}
+
+	err = tegra_mc_setup_latency_allowance(mc);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to setup latency allowance: %d\n",
+			err);
+		return err;
+	}
+
+	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
+		mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
+		if (IS_ERR(mc->smmu)) {
+			dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
+				PTR_ERR(mc->smmu));
+			return PTR_ERR(mc->smmu);
+		}
+	}
+
+	mc->irq = platform_get_irq(pdev, 0);
+	if (mc->irq < 0) {
+		dev_err(&pdev->dev, "interrupt not specified\n");
+		return mc->irq;
+	}
+
+	err = devm_request_irq(&pdev->dev, mc->irq, tegra_mc_irq, IRQF_SHARED,
+			       dev_name(&pdev->dev), mc);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n", mc->irq,
+			err);
+		return err;
+	}
+
+	value = MC_INT_DECERR_MTS | MC_INT_SECERR_SEC | MC_INT_DECERR_VPR |
+		MC_INT_INVALID_APB_ASID_UPDATE | MC_INT_INVALID_SMMU_PAGE |
+		MC_INT_ARBITRATION_EMEM | MC_INT_SECURITY_VIOLATION |
+		MC_INT_DECERR_EMEM;
+	mc_writel(mc, value, MC_INTMASK);
+
+	return 0;
+}
+
+static struct platform_driver tegra_mc_driver = {
+	.driver = {
+		.name = "tegra-mc",
+		.of_match_table = tegra_mc_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.prevent_deferred_probe = true,
+	.probe = tegra_mc_probe,
+};
+
+static int tegra_mc_init(void)
+{
+	return platform_driver_register(&tegra_mc_driver);
+}
+arch_initcall(tegra_mc_init);
+
+MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra Memory Controller driver");
+MODULE_LICENSE("GPL v2");

drivers/memory/tegra/mc.h

+/*
+ * Copyright (C) 2014 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef MEMORY_TEGRA_MC_H
+#define MEMORY_TEGRA_MC_H
+
+#include <linux/io.h>
+#include <linux/types.h>
+
+#include <soc/tegra/mc.h>
+
+static inline u32 mc_readl(struct tegra_mc *mc, unsigned long offset)
+{
+	return readl(mc->regs + offset);
+}
+
+static inline void mc_writel(struct tegra_mc *mc, u32 value,
+			     unsigned long offset)
+{
+	writel(value, mc->regs + offset);
+}
+
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+extern const struct tegra_mc_soc tegra30_mc_soc;
+#endif
+
+#ifdef CONFIG_ARCH_TEGRA_114_SOC
+extern const struct tegra_mc_soc tegra114_mc_soc;
+#endif
+
+#ifdef CONFIG_ARCH_TEGRA_124_SOC
+extern const struct tegra_mc_soc tegra124_mc_soc;
+#endif
+
+#endif /* MEMORY_TEGRA_MC_H */

drivers/memory/tegra30-mc.c

-/*
- * Tegra30 Memory Controller
- *
- * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/ratelimit.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-
-#define DRV_NAME "tegra30-mc"
-
-#define MC_INTSTATUS			0x0
-#define MC_INTMASK			0x4
-
-#define MC_INT_ERR_SHIFT		6
-#define MC_INT_ERR_MASK			(0x1f << MC_INT_ERR_SHIFT)
-#define MC_INT_DECERR_EMEM		BIT(MC_INT_ERR_SHIFT)
-#define MC_INT_SECURITY_VIOLATION	BIT(MC_INT_ERR_SHIFT + 2)
-#define MC_INT_ARBITRATION_EMEM		BIT(MC_INT_ERR_SHIFT + 3)
-#define MC_INT_INVALID_SMMU_PAGE	BIT(MC_INT_ERR_SHIFT + 4)
-
-#define MC_ERR_STATUS			0x8
-#define MC_ERR_ADR			0xc
-
-#define MC_ERR_TYPE_SHIFT		28
-#define MC_ERR_TYPE_MASK		(7 << MC_ERR_TYPE_SHIFT)
-#define MC_ERR_TYPE_DECERR_EMEM		2
-#define MC_ERR_TYPE_SECURITY_TRUSTZONE	3
-#define MC_ERR_TYPE_SECURITY_CARVEOUT	4
-#define MC_ERR_TYPE_INVALID_SMMU_PAGE	6
-
-#define MC_ERR_INVALID_SMMU_PAGE_SHIFT	25
-#define MC_ERR_INVALID_SMMU_PAGE_MASK	(7 << MC_ERR_INVALID_SMMU_PAGE_SHIFT)
-#define MC_ERR_RW_SHIFT			16
-#define MC_ERR_RW			BIT(MC_ERR_RW_SHIFT)
-#define MC_ERR_SECURITY			BIT(MC_ERR_RW_SHIFT + 1)
-
-#define SECURITY_VIOLATION_TYPE		BIT(30)	/* 0=TRUSTZONE, 1=CARVEOUT */
-
-#define MC_EMEM_ARB_CFG			0x90
-#define MC_EMEM_ARB_OUTSTANDING_REQ	0x94
-#define MC_EMEM_ARB_TIMING_RCD		0x98
-#define MC_EMEM_ARB_TIMING_RP		0x9c
-#define MC_EMEM_ARB_TIMING_RC		0xa0
-#define MC_EMEM_ARB_TIMING_RAS		0xa4
-#define MC_EMEM_ARB_TIMING_FAW		0xa8
-#define MC_EMEM_ARB_TIMING_RRD		0xac
-#define MC_EMEM_ARB_TIMING_RAP2PRE	0xb0
-#define MC_EMEM_ARB_TIMING_WAP2PRE	0xb4
-#define MC_EMEM_ARB_TIMING_R2R		0xb8
-#define MC_EMEM_ARB_TIMING_W2W		0xbc
-#define MC_EMEM_ARB_TIMING_R2W		0xc0
-#define MC_EMEM_ARB_TIMING_W2R		0xc4
-
-#define MC_EMEM_ARB_DA_TURNS		0xd0
-#define MC_EMEM_ARB_DA_COVERS		0xd4
-#define MC_EMEM_ARB_MISC0		0xd8
-#define MC_EMEM_ARB_MISC1		0xdc
-
-#define MC_EMEM_ARB_RING3_THROTTLE	0xe4
-#define MC_EMEM_ARB_OVERRIDE		0xe8
-
-#define MC_TIMING_CONTROL		0xfc
-
-#define MC_CLIENT_ID_MASK		0x7f
-
-#define NUM_MC_REG_BANKS		4
-
-struct tegra30_mc {
-	void __iomem *regs[NUM_MC_REG_BANKS];
-	struct device *dev;
-	u32 ctx[0];
-};
-
-static inline u32 mc_readl(struct tegra30_mc *mc, u32 offs)
-{
-	u32 val = 0;
-
-	if (offs < 0x10)
-		val = readl(mc->regs[0] + offs);
-	else if (offs < 0x1f0)
-		val = readl(mc->regs[1] + offs - 0x3c);
-	else if (offs < 0x228)
-		val = readl(mc->regs[2] + offs - 0x200);
-	else if (offs < 0x400)
-		val = readl(mc->regs[3] + offs - 0x284);
-
-	return val;
-}
-
-static inline void mc_writel(struct tegra30_mc *mc, u32 val, u32 offs)
-{
-	if (offs < 0x10)
-		writel(val, mc->regs[0] + offs);
-	else if (offs < 0x1f0)
-		writel(val, mc->regs[1] + offs - 0x3c);
-	else if (offs < 0x228)
-		writel(val, mc->regs[2] + offs - 0x200);
-	else if (offs < 0x400)
-		writel(val, mc->regs[3] + offs - 0x284);
-}
-
-static const char * const tegra30_mc_client[] = {
-	"csr_ptcr",
-	"cbr_display0a",
-	"cbr_display0ab",
-	"cbr_display0b",
-	"cbr_display0bb",
-	"cbr_display0c",
-	"cbr_display0cb",
-	"cbr_display1b",
-	"cbr_display1bb",
-	"cbr_eppup",
-	"cbr_g2pr",
-	"cbr_g2sr",
-	"cbr_mpeunifbr",
-	"cbr_viruv",
-	"csr_afir",
-	"csr_avpcarm7r",
-	"csr_displayhc",
-	"csr_displayhcb",
-	"csr_fdcdrd",
-	"csr_fdcdrd2",
-	"csr_g2dr",
-	"csr_hdar",
-	"csr_host1xdmar",
-	"csr_host1xr",
-	"csr_idxsrd",
-	"csr_idxsrd2",
-	"csr_mpe_ipred",
-	"csr_mpeamemrd",
-	"csr_mpecsrd",
-	"csr_ppcsahbdmar",
-	"csr_ppcsahbslvr",
-	"csr_satar",
-	"csr_texsrd",
-	"csr_texsrd2",
-	"csr_vdebsevr",
-	"csr_vdember",
-	"csr_vdemcer",
-	"csr_vdetper",
-	"csr_mpcorelpr",
-	"csr_mpcorer",
-	"cbw_eppu",
-	"cbw_eppv",
-	"cbw_eppy",
-	"cbw_mpeunifbw",
-	"cbw_viwsb",
-	"cbw_viwu",
-	"cbw_viwv",
-	"cbw_viwy",
-	"ccw_g2dw",
-	"csw_afiw",
-	"csw_avpcarm7w",
-	"csw_fdcdwr",
-	"csw_fdcdwr2",
-	"csw_hdaw",
-	"csw_host1xw",
-	"csw_ispw",
-	"csw_mpcorelpw",
-	"csw_mpcorew",
-	"csw_mpecswr",
-	"csw_ppcsahbdmaw",
-	"csw_ppcsahbslvw",
-	"csw_sataw",
-	"csw_vdebsevw",
-	"csw_vdedbgw",
-	"csw_vdembew",
-	"csw_vdetpmw",
-};
-
-static void tegra30_mc_decode(struct tegra30_mc *mc, int n)
-{
-	u32 err, addr;
-	const char * const mc_int_err[] = {
-		"MC_DECERR",
-		"Unknown",
-		"MC_SECURITY_ERR",
-		"MC_ARBITRATION_EMEM",
-		"MC_SMMU_ERR",
-	};
-	const char * const err_type[] = {
-		"Unknown",
-		"Unknown",
-		"DECERR_EMEM",
-		"SECURITY_TRUSTZONE",
-		"SECURITY_CARVEOUT",
-		"Unknown",
-		"INVALID_SMMU_PAGE",
-		"Unknown",
-	};
-	char attr[6];
-	int cid, perm, type, idx;
-	const char *client = "Unknown";
-
-	idx = n - MC_INT_ERR_SHIFT;
-	if ((idx < 0) || (idx >= ARRAY_SIZE(mc_int_err)) || (idx == 1)) {
-		dev_err_ratelimited(mc->dev, "Unknown interrupt status %08lx\n",
-				    BIT(n));
-		return;
-	}
-
-	err = mc_readl(mc, MC_ERR_STATUS);
-
-	type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT;
-	perm = (err & MC_ERR_INVALID_SMMU_PAGE_MASK) >>
-		MC_ERR_INVALID_SMMU_PAGE_SHIFT;
-	if (type == MC_ERR_TYPE_INVALID_SMMU_PAGE)
-		sprintf(attr, "%c-%c-%c",
-			(perm & BIT(2)) ? 'R' : '-',
-			(perm & BIT(1)) ? 'W' : '-',
-			(perm & BIT(0)) ? 'S' : '-');
-	else
-		attr[0] = '\0';
-
-	cid = err & MC_CLIENT_ID_MASK;
-	if (cid < ARRAY_SIZE(tegra30_mc_client))
-		client = tegra30_mc_client[cid];
-
-	addr = mc_readl(mc, MC_ERR_ADR);
-
-	dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s %s %s)\n",
-			   mc_int_err[idx], err, addr, client,
-			   (err & MC_ERR_SECURITY) ? "secure" : "non-secure",
-			   (err & MC_ERR_RW) ? "write" : "read",
-			   err_type[type], attr);
-}
-
-static const u32 tegra30_mc_ctx[] = {
-	MC_EMEM_ARB_CFG,
-	MC_EMEM_ARB_OUTSTANDING_REQ,
-	MC_EMEM_ARB_TIMING_RCD,
-	MC_EMEM_ARB_TIMING_RP,
-	MC_EMEM_ARB_TIMING_RC,
-	MC_EMEM_ARB_TIMING_RAS,
-	MC_EMEM_ARB_TIMING_FAW,
-	MC_EMEM_ARB_TIMING_RRD,
-	MC_EMEM_ARB_TIMING_RAP2PRE,
-	MC_EMEM_ARB_TIMING_WAP2PRE,
-	MC_EMEM_ARB_TIMING_R2R,
-	MC_EMEM_ARB_TIMING_W2W,
-	MC_EMEM_ARB_TIMING_R2W,
-	MC_EMEM_ARB_TIMING_W2R,
-	MC_EMEM_ARB_DA_TURNS,
-	MC_EMEM_ARB_DA_COVERS,
-	MC_EMEM_ARB_MISC0,
-	MC_EMEM_ARB_MISC1,
-	MC_EMEM_ARB_RING3_THROTTLE,
-	MC_EMEM_ARB_OVERRIDE,
-	MC_INTMASK,
-};
-
-#ifdef CONFIG_PM
-static int tegra30_mc_suspend(struct device *dev)
-{
-	int i;
-	struct tegra30_mc *mc = dev_get_drvdata(dev);
-
-	for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
-		mc->ctx[i] = mc_readl(mc, tegra30_mc_ctx[i]);
-	return 0;
-}
-
-static int tegra30_mc_resume(struct device *dev)
-{
-	int i;
-	struct tegra30_mc *mc = dev_get_drvdata(dev);
-
-	for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++)
-		mc_writel(mc, mc->ctx[i], tegra30_mc_ctx[i]);
-
-	mc_writel(mc, 1, MC_TIMING_CONTROL);
-	/* Read-back to ensure that write reached */
-	mc_readl(mc, MC_TIMING_CONTROL);
-	return 0;
-}
-#endif
-
-static UNIVERSAL_DEV_PM_OPS(tegra30_mc_pm,
-			    tegra30_mc_suspend,
-			    tegra30_mc_resume, NULL);
-
-static const struct of_device_id tegra30_mc_of_match[] = {
-	{ .compatible = "nvidia,tegra30-mc", },
-	{},
-};
-
-static irqreturn_t tegra30_mc_isr(int irq, void *data)
-{
-	u32 stat, mask, bit;
-	struct tegra30_mc *mc = data;
-
-	stat = mc_readl(mc, MC_INTSTATUS);
-	mask = mc_readl(mc, MC_INTMASK);
-	mask &= stat;
-	if (!mask)
-		return IRQ_NONE;
-	while ((bit = ffs(mask)) != 0) {
-		tegra30_mc_decode(mc, bit - 1);
-		mask &= ~BIT(bit - 1);
-	}
-
-	mc_writel(mc, stat, MC_INTSTATUS);
-	return IRQ_HANDLED;
-}
-
-static int tegra30_mc_probe(struct platform_device *pdev)
-{
-	struct resource *irq;
-	struct tegra30_mc *mc;
-	size_t bytes;
-	int err, i;
-	u32 intmask;
-
-	bytes = sizeof(*mc) + sizeof(u32) * ARRAY_SIZE(tegra30_mc_ctx);
-	mc = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
-	if (!mc)
-		return -ENOMEM;
-	mc->dev = &pdev->dev;
-
-	for (i = 0; i < ARRAY_SIZE(mc->regs); i++) {
-		struct resource *res;
-
-		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
-		mc->regs[i] = devm_ioremap_resource(&pdev->dev, res);
-		if (IS_ERR(mc->regs[i]))
-			return PTR_ERR(mc->regs[i]);
-	}
-
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq)
-		return -ENODEV;
-	err = devm_request_irq(&pdev->dev, irq->start, tegra30_mc_isr,
-			       IRQF_SHARED, dev_name(&pdev->dev), mc);
-	if (err)
-		return -ENODEV;
-
-	platform_set_drvdata(pdev, mc);
-
-	intmask = MC_INT_INVALID_SMMU_PAGE |
-		MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION;
-	mc_writel(mc, intmask, MC_INTMASK);
-	return 0;
-}
-
-static struct platform_driver tegra30_mc_driver = {
-	.probe = tegra30_mc_probe,
-	.driver = {
-		.name = DRV_NAME,
-		.owner = THIS_MODULE,
-		.of_match_table = tegra30_mc_of_match,
-		.pm = &tegra30_mc_pm,
-	},
-};
-module_platform_driver(tegra30_mc_driver);
-
-MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
-MODULE_DESCRIPTION("Tegra30 MC driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRV_NAME);

include/dt-bindings/memory/tegra114-mc.h

+#ifndef DT_BINDINGS_MEMORY_TEGRA114_MC_H
+#define DT_BINDINGS_MEMORY_TEGRA114_MC_H
+
+#define TEGRA_SWGROUP_PTC	0
+#define TEGRA_SWGROUP_DC	1
+#define TEGRA_SWGROUP_DCB	2
+#define TEGRA_SWGROUP_EPP	3
+#define TEGRA_SWGROUP_G2	4
+#define TEGRA_SWGROUP_AVPC	5
+#define TEGRA_SWGROUP_NV	6
+#define TEGRA_SWGROUP_HDA	7
+#define TEGRA_SWGROUP_HC	8
+#define TEGRA_SWGROUP_MSENC	9
+#define TEGRA_SWGROUP_PPCS	10
+#define TEGRA_SWGROUP_VDE	11
+#define TEGRA_SWGROUP_MPCORELP	12
+#define TEGRA_SWGROUP_MPCORE	13
+#define TEGRA_SWGROUP_VI	14
+#define TEGRA_SWGROUP_ISP	15
+#define TEGRA_SWGROUP_XUSB_HOST	16
+#define TEGRA_SWGROUP_XUSB_DEV	17
+#define TEGRA_SWGROUP_EMUCIF	18
+#define TEGRA_SWGROUP_TSEC	19
+
+#endif

include/dt-bindings/memory/tegra124-mc.h

+#ifndef DT_BINDINGS_MEMORY_TEGRA124_MC_H
+#define DT_BINDINGS_MEMORY_TEGRA124_MC_H
+
+#define TEGRA_SWGROUP_PTC	0
+#define TEGRA_SWGROUP_DC	1
+#define TEGRA_SWGROUP_DCB	2
+#define TEGRA_SWGROUP_AFI	3
+#define TEGRA_SWGROUP_AVPC	4
+#define TEGRA_SWGROUP_HDA	5
+#define TEGRA_SWGROUP_HC	6
+#define TEGRA_SWGROUP_MSENC	7
+#define TEGRA_SWGROUP_PPCS	8
+#define TEGRA_SWGROUP_SATA	9
+#define TEGRA_SWGROUP_VDE	10
+#define TEGRA_SWGROUP_MPCORELP	11
+#define TEGRA_SWGROUP_MPCORE	12
+#define TEGRA_SWGROUP_ISP2	13
+#define TEGRA_SWGROUP_XUSB_HOST	14
+#define TEGRA_SWGROUP_XUSB_DEV	15
+#define TEGRA_SWGROUP_ISP2B	16
+#define TEGRA_SWGROUP_TSEC	17
+#define TEGRA_SWGROUP_A9AVP	18
+#define TEGRA_SWGROUP_GPU	19
+#define TEGRA_SWGROUP_SDMMC1A	20
+#define TEGRA_SWGROUP_SDMMC2A	21
+#define TEGRA_SWGROUP_SDMMC3A	22
+#define TEGRA_SWGROUP_SDMMC4A	23
+#define TEGRA_SWGROUP_VIC	24
+#define TEGRA_SWGROUP_VI	25
+
+#endif

include/dt-bindings/memory/tegra30-mc.h

+#ifndef DT_BINDINGS_MEMORY_TEGRA30_MC_H
+#define DT_BINDINGS_MEMORY_TEGRA30_MC_H
+
+#define TEGRA_SWGROUP_PTC	0
+#define TEGRA_SWGROUP_DC	1
+#define TEGRA_SWGROUP_DCB	2
+#define TEGRA_SWGROUP_EPP	3
+#define TEGRA_SWGROUP_G2	4
+#define TEGRA_SWGROUP_MPE	5
+#define TEGRA_SWGROUP_VI	6
+#define TEGRA_SWGROUP_AFI	7
+#define TEGRA_SWGROUP_AVPC	8
+#define TEGRA_SWGROUP_NV	9
+#define TEGRA_SWGROUP_NV2	10
+#define TEGRA_SWGROUP_HDA	11
+#define TEGRA_SWGROUP_HC	12
+#define TEGRA_SWGROUP_PPCS	13
+#define TEGRA_SWGROUP_SATA	14
+#define TEGRA_SWGROUP_VDE	15
+#define TEGRA_SWGROUP_MPCORELP	16
+#define TEGRA_SWGROUP_MPCORE	17
+#define TEGRA_SWGROUP_ISP	18
+
+#endif

include/soc/tegra/mc.h

+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __SOC_TEGRA_MC_H__
+#define __SOC_TEGRA_MC_H__
+
+#include <linux/types.h>
+
+struct clk;
+struct device;
+struct page;
+
+struct tegra_smmu_enable {
+	unsigned int reg;
+	unsigned int bit;
+};
+
+/* latency allowance */
+struct tegra_mc_la {
+	unsigned int reg;
+	unsigned int shift;
+	unsigned int mask;
+	unsigned int def;
+};
+
+struct tegra_mc_client {
+	unsigned int id;
+	const char *name;
+	unsigned int swgroup;
+
+	unsigned int fifo_size;
+
+	struct tegra_smmu_enable smmu;
+	struct tegra_mc_la la;
+};
+
+struct tegra_smmu_swgroup {
+	unsigned int swgroup;
+	unsigned int reg;
+};
+
+struct tegra_smmu_ops {
+	void (*flush_dcache)(struct page *page, unsigned long offset,
+			     size_t size);
+};
+
+struct tegra_smmu_soc {
+	const struct tegra_mc_client *clients;
+	unsigned int num_clients;
+
+	const struct tegra_smmu_swgroup *swgroups;
+	unsigned int num_swgroups;
+
+	bool supports_round_robin_arbitration;
+	bool supports_request_limit;
+
+	unsigned int num_asids;
+
+	const struct tegra_smmu_ops *ops;
+};
+
+struct tegra_mc;
+struct tegra_smmu;
+
+#ifdef CONFIG_TEGRA_IOMMU_SMMU
+struct tegra_smmu *tegra_smmu_probe(struct device *dev,
+				    const struct tegra_smmu_soc *soc,
+				    struct tegra_mc *mc);
+#else
+static inline struct tegra_smmu *
+tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc,
+		 struct tegra_mc *mc)
+{
+	return NULL;
+}
+#endif
+
+struct tegra_mc_soc {
+	const struct tegra_mc_client *clients;
+	unsigned int num_clients;
+
+	const unsigned int *emem_regs;
+	unsigned int num_emem_regs;
+
+	unsigned int num_address_bits;
+	unsigned int atom_size;
+
+	const struct tegra_smmu_soc *smmu;
+};
+
+struct tegra_mc {
+	struct device *dev;
+	struct tegra_smmu *smmu;
+	void __iomem *regs;
+	struct clk *clk;
+	int irq;
+
+	const struct tegra_mc_soc *soc;
+	unsigned long tick;
+};
+
+#endif /* __SOC_TEGRA_MC_H__ */