[PATCH 1/1] ARM: tegra: Add Tegra Memory Controller(MC) driver
From: Hiroshi DOYU
Date: Thu May 03 2012 - 12:52:12 EST
Tegra Memory Controller(MC) driver for Tegra20/30.
Added to support MC General interrupts, mainly for IOMMU.
Signed-off-by: Hiroshi DOYU <hdoyu@xxxxxxxxxx>
---
The location of a file may not be suitable because of xxx_driver under arch/arm/mach-*.
---
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 2eb4445..4001cc8 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -1,3 +1,4 @@
+obj-y += tegra-mc.o
obj-y += board-pinmux.o
obj-y += common.o
obj-y += devices.o
diff --git a/arch/arm/mach-tegra/tegra-mc.c b/arch/arm/mach-tegra/tegra-mc.c
new file mode 100644
index 0000000..7af2a99
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra-mc.c
@@ -0,0 +1,502 @@
+/*
+ * Tegra 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/kernel.h>
+#include <linux/module.h>
+#include <linux/ratelimit.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#define DRV_NAME "tegra-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_INVALID_GART_PAGE BIT(MC_INT_ERR_SHIFT + 1)
+#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 MC_GART_ERROR_REQ 0x30
+#define MC_GART_ERROR_ADDR 0x34
+
+#define MC_DECERR_EMEM_OTHERS_STATUS 0x58
+#define MC_DECERR_EMEM_OTHERS_ADR 0x5c
+
+#define MC_SECURITY_VIOLATION_STATUS 0x74
+#define MC_SECURITY_VIOLATION_ADR 0x78
+
+#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
+
+static const char * const mc_int_err[] = {
+ "MC_DECERR",
+ "MC_GART_ERR",
+ "MC_SECURITY_ERR",
+ "MC_ARBITRATION_EMEM",
+ "MC_SMMU_ERR",
+};
+
+struct tegra_mc;
+
+struct tegra_mc_info {
+ u32 intmask;
+ void (*decode)(struct tegra_mc *mc, u32 stat);
+ const char * const *client;
+ int num_client;
+ u32 id_mask;
+};
+
+struct tegra_mc {
+ void __iomem *regs;
+ struct device *dev;
+ struct tegra_mc_info *info;
+ u32 ctx[0];
+};
+
+static inline u32 mc_readl(struct tegra_mc *mc, u32 offset)
+{
+ return readl(mc->regs + offset);
+}
+
+static inline void mc_writel(struct tegra_mc *mc, u32 value, u32 offset)
+{
+ writel(value, mc->regs + offset);
+}
+
+#ifdef CONFIG_ARCH_TEGRA_2x_SOC
+static const char * const tegra20_mc_client[] = {
+ "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_avpcarm7r",
+ "csr_displayhc",
+ "csr_displayhcb",
+ "csr_fdcdrd",
+ "csr_g2dr",
+ "csr_host1xdmar",
+ "csr_host1xr",
+ "csr_idxsrd",
+ "csr_mpcorer",
+ "csr_mpe_ipred",
+ "csr_mpeamemrd",
+ "csr_mpecsrd",
+ "csr_ppcsahbdmar",
+ "csr_ppcsahbslvr",
+ "csr_texsrd",
+ "csr_vdebsevr",
+ "csr_vdember",
+ "csr_vdemcer",
+ "csr_vdetper",
+ "cbw_eppu",
+ "cbw_eppv",
+ "cbw_eppy",
+ "cbw_mpeunifbw",
+ "cbw_viwsb",
+ "cbw_viwu",
+ "cbw_viwv",
+ "cbw_viwy",
+ "ccw_g2dw",
+ "csw_avpcarm7w",
+ "csw_fdcdwr",
+ "csw_host1xw",
+ "csw_ispw",
+ "csw_mpcorew",
+ "csw_mpecswr",
+ "csw_ppcsahbdmaw",
+ "csw_ppcsahbslvw",
+ "csw_vdebsevw",
+ "csw_vdembew",
+ "csw_vdetpmw",
+};
+
+static void tegra20_mc_decode(struct tegra_mc *mc, u32 stat)
+{
+ u32 addr, req;
+ const char *client = "Unknown";
+ int idx, cid;
+ struct reg_info {
+ u32 offset;
+ u32 write_bit; /* 0=READ, 1=WRITE */
+ int cid_shift;
+ } reg[] = {
+ {
+ .offset = MC_DECERR_EMEM_OTHERS_STATUS,
+ .write_bit = 31,
+ },
+ {
+ .offset = MC_GART_ERROR_REQ,
+ .cid_shift = 1,
+ },
+ {
+ .offset = MC_SECURITY_VIOLATION_STATUS,
+ .write_bit = 31,
+ },
+ };
+
+ idx = __ffs(stat >> MC_INT_ERR_SHIFT);
+ req = mc_readl(mc, reg[idx].offset);
+ cid = (req >> reg[idx].cid_shift) & mc->info->id_mask;
+ addr = mc_readl(mc, reg[idx].offset + sizeof(u32));
+
+ if (cid < mc->info->num_client)
+ client = mc->info->client[cid];
+
+ pr_err_ratelimited("%s (0x%08x): 0x%08x %s (%s %s)\n",
+ mc_int_err[idx], req, addr, client,
+ (req & (1 << reg[idx].write_bit)) ? "write" : "read",
+ (reg[idx].offset == MC_SECURITY_VIOLATION_STATUS) ?
+ ((req & SECURITY_VIOLATION_TYPE) ?
+ "carveout" : "trustzone") : "");
+}
+
+static struct tegra_mc_info tegra20_mc_info = {
+ .intmask = MC_INT_INVALID_GART_PAGE,
+ .decode = tegra20_mc_decode,
+ .client = tegra20_mc_client,
+ .num_client = ARRAY_SIZE(tegra20_mc_client),
+ .id_mask = 0x3f,
+};
+#else
+static struct tegra_mc_info tegra20_mc_info = {};
+#endif /* CONFIG_ARCH_TEGRA_2x_SOC */
+
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+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 tegra_mc *mc, u32 stat)
+{
+ u32 err, addr;
+ char *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";
+
+ err = readl(mc + MC_ERR_STATUS);
+ addr = readl(mc + MC_ERR_ADR);
+
+ idx = __ffs(stat >> MC_INT_ERR_SHIFT);
+ type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT;
+
+ cid = err & mc->info->id_mask;
+ if (cid < mc->info->num_client)
+ client = mc->info->client[cid];
+
+ 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';
+
+ pr_err_ratelimited("%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 struct tegra_mc_info tegra30_mc_info = {
+ .intmask = MC_INT_INVALID_SMMU_PAGE,
+ .decode = tegra30_mc_decode,
+ .client = tegra30_mc_client,
+ .num_client = ARRAY_SIZE(tegra30_mc_client),
+ .id_mask = 0x7f,
+};
+
+static u32 tegra_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,
+};
+
+static int tegra_mc_suspend(struct device *dev)
+{
+ int i;
+ struct tegra_mc *mc = dev_get_drvdata(dev);
+
+ for (i = 0; i < ARRAY_SIZE(tegra_mc_ctx); i++)
+ mc->ctx[i] = mc_readl(mc, tegra_mc_ctx[i]);
+ return 0;
+}
+
+static int tegra_mc_resume(struct device *dev)
+{
+ int i;
+ struct tegra_mc *mc = dev_get_drvdata(dev);
+
+ for (i = 0; i < ARRAY_SIZE(tegra_mc_ctx); i++)
+ mc_writel(mc, mc->ctx[i], tegra_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;
+}
+
+#else
+static u32 tegra_mc_ctx[0];
+#define tegra_mc_suspend NULL
+#define tegra_mc_resume NULL
+static struct tegra_mc_info tegra30_mc_info = {};
+#endif /* CONFIG_ARCH_TEGRA_3x_SOC */
+
+static UNIVERSAL_DEV_PM_OPS(tegra_mc_pm,
+ tegra_mc_suspend,
+ tegra_mc_resume, NULL);
+
+static const struct of_device_id tegra_mc_of_match[] __devinitconst = {
+ { .compatible = "nvidia,tegra30-mc", .data = &tegra30_mc_info, },
+ { .compatible = "nvidia,tegra20-mc", .data = &tegra20_mc_info, },
+ {},
+};
+
+static irqreturn_t tegra_mc_isr(int irq, void *data)
+{
+ u32 stat, mask, bit;
+ struct tegra_mc *mc = data;
+
+ stat = mc_readl(mc, MC_INTSTATUS);
+ mask = mc_readl(mc, MC_INTMASK);
+ mask &= stat;
+ while ((bit = ffs(mask)) != 0)
+ mc->info->decode(mc, 1 << (bit - 1));
+ mc_writel(mc, stat, MC_INTSTATUS);
+ return IRQ_HANDLED;
+}
+
+static int __devinit tegra_mc_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct tegra_mc *mc;
+ size_t bytes;
+ int err;
+ const struct of_device_id *id;
+ struct tegra_mc_info *info;
+
+ bytes = sizeof(*mc) + sizeof(u32) * ARRAY_SIZE(tegra_mc_ctx);
+ mc = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
+ if (!mc)
+ return -ENOMEM;
+ mc->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+ mc->regs = devm_request_and_ioremap(&pdev->dev, res);
+ if (!mc->regs)
+ return -EBUSY;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res)
+ return -ENODEV;
+ err = devm_request_irq(&pdev->dev, res->start, tegra_mc_isr,
+ IRQF_SHARED, dev_name(&pdev->dev), mc);
+ if (err)
+ return -ENODEV;
+
+ id = of_match_device(tegra_mc_of_match, &pdev->dev);
+ if (!id)
+ return -ENODEV;
+ platform_set_drvdata(pdev, mc);
+
+ info = id->data;
+ if (!info)
+ return -EINVAL;
+ mc->info = info;
+ info->intmask |= MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION;
+ mc_writel(mc, info->intmask, MC_INTMASK);
+ return 0;
+}
+
+static int __devexit tegra_mc_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver tegra_mc_driver = {
+ .probe = tegra_mc_probe,
+ .remove = __devexit_p(tegra_mc_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = tegra_mc_of_match,
+ .pm = &tegra_mc_pm,
+ },
+};
+module_platform_driver(tegra_mc_driver);
+
+MODULE_AUTHOR("Hiroshi DOYU <hdoyu@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Tegra MC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
--
1.7.5.4
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