msm: Platform initialization for the IOMMU driver

Register a driver for the MSM IOMMU devices and a driver
for the translation context devices. Set up the global
IOMMU registers and initialize the context banks.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>

1 files changed, 374 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/iommu_dev.c b/arch/arm/mach-msm/iommu_dev.c
new file mode 100644
index 000000000000..c33ae786c41f
--- /dev/null
+++ b/arch/arm/mach-msm/iommu_dev.c
@@ -0,0 +1,374 @@
+/* Copyright (c) 2010, Code Aurora Forum. 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 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/iommu.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <mach/iommu_hw-8xxx.h>
+#include <mach/iommu.h>
+
+struct iommu_ctx_iter_data {
+        /* input */
+        const char *name;
+
+        /* output */
+        struct device *dev;
+};
+
+static struct platform_device *msm_iommu_root_dev;
+
+static int each_iommu_ctx(struct device *dev, void *data)
+{
+        struct iommu_ctx_iter_data *res = data;
+        struct msm_iommu_ctx_dev *c = dev->platform_data;
+
+        if (!res || !c || !c->name || !res->name)
+                return -EINVAL;
+
+        if (!strcmp(res->name, c->name)) {
+                res->dev = dev;
+                return 1;
+        }
+        return 0;
+}
+
+static int each_iommu(struct device *dev, void *data)
+{
+        return device_for_each_child(dev, data, each_iommu_ctx);
+}
+
+struct device *msm_iommu_get_ctx(const char *ctx_name)
+{
+        struct iommu_ctx_iter_data r;
+        int found;
+
+        if (!msm_iommu_root_dev) {
+                pr_err("No root IOMMU device.\n");
+                goto fail;
+        }
+
+        r.name = ctx_name;
+        found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
+
+        if (!found) {
+                pr_err("Could not find context <%s>\n", ctx_name);
+                goto fail;
+        }
+
+        return r.dev;
+fail:
+        return NULL;
+}
+EXPORT_SYMBOL(msm_iommu_get_ctx);
+
+static void msm_iommu_reset(void __iomem *base)
+{
+        int ctx, ncb;
+
+        SET_RPUE(base, 0);
+        SET_RPUEIE(base, 0);
+        SET_ESRRESTORE(base, 0);
+        SET_TBE(base, 0);
+        SET_CR(base, 0);
+        SET_SPDMBE(base, 0);
+        SET_TESTBUSCR(base, 0);
+        SET_TLBRSW(base, 0);
+        SET_GLOBAL_TLBIALL(base, 0);
+        SET_RPU_ACR(base, 0);
+        SET_TLBLKCRWE(base, 1);
+        ncb = GET_NCB(base)+1;
+
+        for (ctx = 0; ctx < ncb; ctx++) {
+                SET_BPRCOSH(base, ctx, 0);
+                SET_BPRCISH(base, ctx, 0);
+                SET_BPRCNSH(base, ctx, 0);
+                SET_BPSHCFG(base, ctx, 0);
+                SET_BPMTCFG(base, ctx, 0);
+                SET_ACTLR(base, ctx, 0);
+                SET_SCTLR(base, ctx, 0);
+                SET_FSRRESTORE(base, ctx, 0);
+                SET_TTBR0(base, ctx, 0);
+                SET_TTBR1(base, ctx, 0);
+                SET_TTBCR(base, ctx, 0);
+                SET_BFBCR(base, ctx, 0);
+                SET_PAR(base, ctx, 0);
+                SET_FAR(base, ctx, 0);
+                SET_CTX_TLBIALL(base, ctx, 0);
+                SET_TLBFLPTER(base, ctx, 0);
+                SET_TLBSLPTER(base, ctx, 0);
+                SET_TLBLKCR(base, ctx, 0);
+                SET_PRRR(base, ctx, 0);
+                SET_NMRR(base, ctx, 0);
+                SET_CONTEXTIDR(base, ctx, 0);
+        }
+}
+
+static int msm_iommu_probe(struct platform_device *pdev)
+{
+        struct resource *r;
+        struct clk *iommu_clk;
+        struct msm_iommu_drvdata *drvdata;
+        struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
+        void __iomem *regs_base;
+        resource_size_t len;
+        int ret = 0, ncb, nm2v, irq;
+
+        if (pdev->id != -1) {
+                drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
+
+                if (!drvdata) {
+                        ret = -ENOMEM;
+                        goto fail;
+                }
+
+                if (!iommu_dev) {
+                        ret = -ENODEV;
+                        goto fail;
+                }
+
+                if (iommu_dev->clk_rate != 0) {
+                        iommu_clk = clk_get(&pdev->dev, "iommu_clk");
+
+                        if (IS_ERR(iommu_clk)) {
+                                ret = -ENODEV;
+                                goto fail;
+                        }
+
+                        if (iommu_dev->clk_rate > 0) {
+                                ret = clk_set_rate(iommu_clk,
+                                                        iommu_dev->clk_rate);
+                                if (ret) {
+                                        clk_put(iommu_clk);
+                                        goto fail;
+                                }
+                        }
+
+                        ret = clk_enable(iommu_clk);
+                        if (ret) {
+                                clk_put(iommu_clk);
+                                goto fail;
+                        }
+                        clk_put(iommu_clk);
+                }
+
+                r = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+                                                 "physbase");
+                if (!r) {
+                        ret = -ENODEV;
+                        goto fail;
+                }
+
+                len = r->end - r->start + 1;
+
+                r = request_mem_region(r->start, len, r->name);
+                if (!r) {
+                        pr_err("Could not request memory region: "
+                        "start=%p, len=%d\n", (void *) r->start, len);
+                        ret = -EBUSY;
+                        goto fail;
+                }
+
+                regs_base = ioremap(r->start, len);
+
+                if (!regs_base) {
+                        pr_err("Could not ioremap: start=%p, len=%d\n",
+                                 (void *) r->start, len);
+                        ret = -EBUSY;
+                        goto fail;
+                }
+
+                irq = platform_get_irq_byname(pdev, "secure_irq");
+                if (irq < 0) {
+                        ret = -ENODEV;
+                        goto fail;
+                }
+
+                mb();
+
+                if (GET_IDR(regs_base) == 0) {
+                        pr_err("Invalid IDR value detected\n");
+                        ret = -ENODEV;
+                        goto fail;
+                }
+
+                ret = request_irq(irq, msm_iommu_fault_handler, 0,
+                                "msm_iommu_secure_irpt_handler", drvdata);
+                if (ret) {
+                        pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
+                        goto fail;
+                }
+
+                msm_iommu_reset(regs_base);
+                drvdata->base = regs_base;
+                drvdata->irq = irq;
+
+                nm2v = GET_NM2VCBMT((unsigned long) regs_base);
+                ncb = GET_NCB((unsigned long) regs_base);
+
+                pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
+                        iommu_dev->name, regs_base, irq, ncb+1);
+
+                platform_set_drvdata(pdev, drvdata);
+        } else
+                msm_iommu_root_dev = pdev;
+
+        return 0;
+
+fail:
+        kfree(drvdata);
+        return ret;
+}
+
+static int msm_iommu_remove(struct platform_device *pdev)
+{
+        struct msm_iommu_drvdata *drv = NULL;
+
+        drv = platform_get_drvdata(pdev);
+        if (drv) {
+                memset(drv, 0, sizeof(struct msm_iommu_drvdata));
+                kfree(drv);
+                platform_set_drvdata(pdev, NULL);
+        }
+        return 0;
+}
+
+static int msm_iommu_ctx_probe(struct platform_device *pdev)
+{
+        struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
+        struct msm_iommu_drvdata *drvdata;
+        struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
+        int i, ret = 0;
+        if (!c || !pdev->dev.parent) {
+                ret = -EINVAL;
+                goto fail;
+        }
+
+        drvdata = dev_get_drvdata(pdev->dev.parent);
+
+        if (!drvdata) {
+                ret = -ENODEV;
+                goto fail;
+        }
+
+        ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
+        if (!ctx_drvdata) {
+                ret = -ENOMEM;
+                goto fail;
+        }
+        ctx_drvdata->num = c->num;
+        ctx_drvdata->pdev = pdev;
+
+        INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
+        platform_set_drvdata(pdev, ctx_drvdata);
+
+        /* Program the M2V tables for this context */
+        for (i = 0; i < MAX_NUM_MIDS; i++) {
+                int mid = c->mids[i];
+                if (mid == -1)
+                        break;
+
+                SET_M2VCBR_N(drvdata->base, mid, 0);
+                SET_CBACR_N(drvdata->base, c->num, 0);
+
+                /* Set VMID = MID */
+                SET_VMID(drvdata->base, mid, mid);
+
+                /* Set the context number for that MID to this context */
+                SET_CBNDX(drvdata->base, mid, c->num);
+
+                /* Set MID associated with this context bank */
+                SET_CBVMID(drvdata->base, c->num, mid);
+
+                /* Set security bit override to be Non-secure */
+                SET_NSCFG(drvdata->base, mid, 3);
+        }
+
+        pr_info("context device %s with bank index %d\n", c->name, c->num);
+
+        return 0;
+fail:
+        kfree(ctx_drvdata);
+        return ret;
+}
+
+static int msm_iommu_ctx_remove(struct platform_device *pdev)
+{
+        struct msm_iommu_ctx_drvdata *drv = NULL;
+        drv = platform_get_drvdata(pdev);
+        if (drv) {
+                memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
+                kfree(drv);
+                platform_set_drvdata(pdev, NULL);
+        }
+        return 0;
+}
+
+static struct platform_driver msm_iommu_driver = {
+        .driver = {
+                .name   = "msm_iommu",
+        },
+        .probe          = msm_iommu_probe,
+        .remove         = msm_iommu_remove,
+};
+
+static struct platform_driver msm_iommu_ctx_driver = {
+        .driver = {
+                .name   = "msm_iommu_ctx",
+        },
+        .probe          = msm_iommu_ctx_probe,
+        .remove         = msm_iommu_ctx_remove,
+};
+
+static int msm_iommu_driver_init(void)
+{
+        int ret;
+        ret = platform_driver_register(&msm_iommu_driver);
+        if (ret != 0) {
+                pr_err("Failed to register IOMMU driver\n");
+                goto error;
+        }
+
+        ret = platform_driver_register(&msm_iommu_ctx_driver);
+        if (ret != 0) {
+                pr_err("Failed to register IOMMU context driver\n");
+                goto error;
+        }
+
+error:
+        return ret;
+}
+
+static void msm_iommu_driver_exit(void)
+{
+        platform_driver_unregister(&msm_iommu_ctx_driver);
+        platform_driver_unregister(&msm_iommu_driver);
+}
+
+subsys_initcall(msm_iommu_driver_init);
+module_exit(msm_iommu_driver_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");