ARM: tegra20: Add Tegra Memory Controller(MC) driver

Tegra Memory Controller(MC) driver for Tegra20
Added to support MC General interrupts, mainly for IOMMU(GART).

Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 267 insertions, 0 deletions

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index e0b3156d65b5..ebade1647f9e 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -20,4 +20,8 @@ config TI_EMIF
           parameters and other settings during frequency, voltage and
           temperature changes
 
+config TEGRA20_MC
+        bool
+        depends on ARCH_TEGRA_2x_SOC
+
 endif
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index e27f80b28859..1f585184d88b 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_TI_EMIF)           += emif.o
+obj-$(CONFIG_TEGRA20_MC)        += tegra20-mc.o
diff --git a/drivers/memory/tegra20-mc.c b/drivers/memory/tegra20-mc.c
new file mode 100644
index 000000000000..c0bfffacdc64
--- /dev/null
+++ b/drivers/memory/tegra20-mc.c
@@ -0,0 +1,262 @@
+/*
+ * Tegra20 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>
+
+#define DRV_NAME "tegra20-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_GART_ERROR_REQ               0x30
+#define MC_DECERR_EMEM_OTHERS_STATUS    0x58
+#define MC_SECURITY_VIOLATION_STATUS    0x74
+
+#define SECURITY_VIOLATION_TYPE         BIT(30) /* 0=TRUSTZONE, 1=CARVEOUT */
+
+#define MC_CLIENT_ID_MASK               0x3f
+
+#define NUM_MC_REG_BANKS                2
+
+struct tegra20_mc {
+        void __iomem *regs[NUM_MC_REG_BANKS];
+        struct device *dev;
+};
+
+static inline u32 mc_readl(struct tegra20_mc *mc, u32 offs)
+{
+        if (offs < 0x24)
+                return readl(mc->regs[0] + offs);
+        BUG_ON(offs < 0x3c);
+        if (offs < 0x400)
+                return readl(mc->regs[1] + offs - 0x3c);
+        BUG();
+}
+
+static inline void mc_writel(struct tegra20_mc *mc, u32 val, u32 offs)
+{
+        if (offs < 0x24) {
+                writel(val, mc->regs[0] + offs);
+                return;
+        }
+        BUG_ON(offs < 0x3c);
+        if (offs < 0x400) {
+                writel(val, mc->regs[1] + offs - 0x3c);
+                return;
+        }
+        BUG();
+}
+
+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 tegra20_mc *mc, int n)
+{
+        u32 addr, req;
+        const char *client = "Unknown";
+        int idx, cid;
+        const struct reg_info {
+                u32 offset;
+                u32 write_bit;  /* 0=READ, 1=WRITE */
+                int cid_shift;
+                char *message;
+        } reg[] = {
+                {
+                        .offset = MC_DECERR_EMEM_OTHERS_STATUS,
+                        .write_bit = 31,
+                        .message = "MC_DECERR",
+                },
+                {
+                        .offset = MC_GART_ERROR_REQ,
+                        .cid_shift = 1,
+                        .message = "MC_GART_ERR",
+
+                },
+                {
+                        .offset = MC_SECURITY_VIOLATION_STATUS,
+                        .write_bit = 31,
+                        .message = "MC_SECURITY_ERR",
+                },
+        };
+
+        idx = n - MC_INT_ERR_SHIFT;
+        if ((idx < 0) || (idx >= ARRAY_SIZE(reg))) {
+                pr_err_ratelimited("Unknown interrupt status %08lx\n", BIT(n));
+                return;
+        }
+
+        req = mc_readl(mc, reg[idx].offset);
+        cid = (req >> reg[idx].cid_shift) & MC_CLIENT_ID_MASK;
+        if (cid < ARRAY_SIZE(tegra20_mc_client))
+                client = tegra20_mc_client[cid];
+
+        addr = mc_readl(mc, reg[idx].offset + sizeof(u32));
+
+        pr_err_ratelimited("%s (0x%08x): 0x%08x %s (%s %s)\n",
+                           reg[idx].message, req, addr, client,
+                           (req & BIT(reg[idx].write_bit)) ? "write" : "read",
+                           (reg[idx].offset == MC_SECURITY_VIOLATION_STATUS) ?
+                           ((req & SECURITY_VIOLATION_TYPE) ?
+                            "carveout" : "trustzone") : "");
+}
+
+static const struct of_device_id tegra20_mc_of_match[] __devinitconst = {
+        { .compatible = "nvidia,tegra20-mc", },
+        {},
+};
+
+static irqreturn_t tegra20_mc_isr(int irq, void *data)
+{
+        u32 stat, mask, bit;
+        struct tegra20_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)
+                tegra20_mc_decode(mc, bit - 1);
+        mc_writel(mc, stat, MC_INTSTATUS);
+        return IRQ_HANDLED;
+}
+
+static int __devinit tegra20_mc_probe(struct platform_device *pdev)
+{
+        struct resource *irq;
+        struct tegra20_mc *mc;
+        int i, err;
+        u32 intmask;
+
+        mc = devm_kzalloc(&pdev->dev, sizeof(*mc), 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);
+                if (!res)
+                        return -ENODEV;
+                mc->regs[i] = devm_request_and_ioremap(&pdev->dev, res);
+                if (!mc->regs[i])
+                        return -EBUSY;
+        }
+
+        irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!irq)
+                return -ENODEV;
+        err = devm_request_irq(&pdev->dev, irq->start, tegra20_mc_isr,
+                               IRQF_SHARED, dev_name(&pdev->dev), mc);
+        if (err)
+                return -ENODEV;
+
+        platform_set_drvdata(pdev, mc);
+
+        intmask = MC_INT_INVALID_GART_PAGE |
+                MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION;
+        mc_writel(mc, intmask, MC_INTMASK);
+        return 0;
+}
+
+static int __devexit tegra20_mc_remove(struct platform_device *pdev)
+{
+        return 0;
+}
+
+static struct platform_driver tegra20_mc_driver = {
+        .probe = tegra20_mc_probe,
+        .remove = __devexit_p(tegra20_mc_remove),
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+                .of_match_table = tegra20_mc_of_match,
+        },
+};
+module_platform_driver(tegra20_mc_driver);
+
+MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
+MODULE_DESCRIPTION("Tegra20 MC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);