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iommu_dev.c

/* 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>

00033 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, *r2;
      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;

            r2 = request_mem_region(r->start, len, r->name);
            if (!r2) {
                  pr_err("Could not request memory region: "
                  "start=%p, len=%d\n", (void *) r->start, len);
                  ret = -EBUSY;
                  goto fail;
            }

            regs_base = ioremap(r2->start, len);

            if (!regs_base) {
                  pr_err("Could not ioremap: start=%p, len=%d\n",
                         (void *) r2->start, len);
                  ret = -EBUSY;
                  goto fail_mem;
            }

            irq = platform_get_irq_byname(pdev, "secure_irq");
            if (irq < 0) {
                  ret = -ENODEV;
                  goto fail_io;
            }

            mb();

            if (GET_IDR(regs_base) == 0) {
                  pr_err("Invalid IDR value detected\n");
                  ret = -ENODEV;
                  goto fail_io;
            }

            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_io;
            }

            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_io:
      iounmap(regs_base);
fail_mem:
      release_mem_region(r->start, len);
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 __init 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 __exit 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>");

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