drivers/iommu/msm_iommu_dev.c

   1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  */
  17
  18 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/io.h>
  24 #include <linux/clk.h>
  25 #include <linux/iommu.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/err.h>
  28 #include <linux/slab.h>
  29
  30 #include "msm_iommu_hw-8xxx.h"
  31 #include "msm_iommu.h"
  32
  33 struct iommu_ctx_iter_data {
  34         /* input */
  35         const char *name;
  36
  37         /* output */
  38         struct device *dev;
  39 };
  40
  41 static struct platform_device *msm_iommu_root_dev;
  42
  43 static int each_iommu_ctx(struct device *dev, void *data)
  44 {
  45         struct iommu_ctx_iter_data *res = data;
  46         struct msm_iommu_ctx_dev *c = dev->platform_data;
  47
  48         if (!res || !c || !c->name || !res->name)
  49                 return -EINVAL;
  50
  51         if (!strcmp(res->name, c->name)) {
  52                 res->dev = dev;
  53                 return 1;
  54         }
  55         return 0;
  56 }
  57
  58 static int each_iommu(struct device *dev, void *data)
  59 {
  60         return device_for_each_child(dev, data, each_iommu_ctx);
  61 }
  62
  63 struct device *msm_iommu_get_ctx(const char *ctx_name)
  64 {
  65         struct iommu_ctx_iter_data r;
  66         int found;
  67
  68         if (!msm_iommu_root_dev) {
  69                 pr_err("No root IOMMU device.\n");
  70                 goto fail;
  71         }
  72
  73         r.name = ctx_name;
  74         found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
  75
  76         if (!found) {
  77                 pr_err("Could not find context <%s>\n", ctx_name);
  78                 goto fail;
  79         }
  80
  81         return r.dev;
  82 fail:
  83         return NULL;
  84 }
  85 EXPORT_SYMBOL(msm_iommu_get_ctx);
  86
  87 static void msm_iommu_reset(void __iomem *base, int ncb)
  88 {
  89         int ctx;
  90
  91         SET_RPUE(base, 0);
  92         SET_RPUEIE(base, 0);
  93         SET_ESRRESTORE(base, 0);
  94         SET_TBE(base, 0);
  95         SET_CR(base, 0);
  96         SET_SPDMBE(base, 0);
  97         SET_TESTBUSCR(base, 0);
  98         SET_TLBRSW(base, 0);
  99         SET_GLOBAL_TLBIALL(base, 0);
 100         SET_RPU_ACR(base, 0);
 101         SET_TLBLKCRWE(base, 1);
 102
 103         for (ctx = 0; ctx < ncb; ctx++) {
 104                 SET_BPRCOSH(base, ctx, 0);
 105                 SET_BPRCISH(base, ctx, 0);
 106                 SET_BPRCNSH(base, ctx, 0);
 107                 SET_BPSHCFG(base, ctx, 0);
 108                 SET_BPMTCFG(base, ctx, 0);
 109                 SET_ACTLR(base, ctx, 0);
 110                 SET_SCTLR(base, ctx, 0);
 111                 SET_FSRRESTORE(base, ctx, 0);
 112                 SET_TTBR0(base, ctx, 0);
 113                 SET_TTBR1(base, ctx, 0);
 114                 SET_TTBCR(base, ctx, 0);
 115                 SET_BFBCR(base, ctx, 0);
 116                 SET_PAR(base, ctx, 0);
 117                 SET_FAR(base, ctx, 0);
 118                 SET_CTX_TLBIALL(base, ctx, 0);
 119                 SET_TLBFLPTER(base, ctx, 0);
 120                 SET_TLBSLPTER(base, ctx, 0);
 121                 SET_TLBLKCR(base, ctx, 0);
 122                 SET_PRRR(base, ctx, 0);
 123                 SET_NMRR(base, ctx, 0);
 124                 SET_CONTEXTIDR(base, ctx, 0);
 125         }
 126 }
 127
 128 static int msm_iommu_probe(struct platform_device *pdev)
 129 {
 130         struct resource *r;
 131         struct clk *iommu_clk;
 132         struct clk *iommu_pclk;
 133         struct msm_iommu_drvdata *drvdata;
 134         struct msm_iommu_dev *iommu_dev = dev_get_platdata(&pdev->dev);
 135         void __iomem *regs_base;
 136         int ret, irq, par;
 137
 138         if (pdev->id == -1) {
 139                 msm_iommu_root_dev = pdev;
 140                 return 0;
 141         }
 142
 143         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
 144
 145         if (!drvdata) {
 146                 ret = -ENOMEM;
 147                 goto fail;
 148         }
 149
 150         if (!iommu_dev) {
 151                 ret = -ENODEV;
 152                 goto fail;
 153         }
 154
 155         iommu_pclk = clk_get(NULL, "smmu_pclk");
 156         if (IS_ERR(iommu_pclk)) {
 157                 ret = -ENODEV;
 158                 goto fail;
 159         }
 160
 161         ret = clk_prepare_enable(iommu_pclk);
 162         if (ret)
 163                 goto fail_enable;
 164
 165         iommu_clk = clk_get(&pdev->dev, "iommu_clk");
 166
 167         if (!IS_ERR(iommu_clk)) {
 168                 if (clk_get_rate(iommu_clk) == 0)
 169                         clk_set_rate(iommu_clk, 1);
 170
 171                 ret = clk_prepare_enable(iommu_clk);
 172                 if (ret) {
 173                         clk_put(iommu_clk);
 174                         goto fail_pclk;
 175                 }
 176         } else
 177                 iommu_clk = NULL;
 178
 179         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
 180         regs_base = devm_ioremap_resource(&pdev->dev, r);
 181         if (IS_ERR(regs_base)) {
 182                 ret = PTR_ERR(regs_base);
 183                 goto fail_clk;
 184         }
 185
 186         irq = platform_get_irq_byname(pdev, "secure_irq");
 187         if (irq < 0) {
 188                 ret = -ENODEV;
 189                 goto fail_clk;
 190         }
 191
 192         msm_iommu_reset(regs_base, iommu_dev->ncb);
 193
 194         SET_M(regs_base, 0, 1);
 195         SET_PAR(regs_base, 0, 0);
 196         SET_V2PCFG(regs_base, 0, 1);
 197         SET_V2PPR(regs_base, 0, 0);
 198         par = GET_PAR(regs_base, 0);
 199         SET_V2PCFG(regs_base, 0, 0);
 200         SET_M(regs_base, 0, 0);
 201
 202         if (!par) {
 203                 pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
 204                 ret = -ENODEV;
 205                 goto fail_clk;
 206         }
 207
 208         ret = request_irq(irq, msm_iommu_fault_handler, 0,
 209                         "msm_iommu_secure_irpt_handler", drvdata);
 210         if (ret) {
 211                 pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
 212                 goto fail_clk;
 213         }
 214
 215
 216         drvdata->pclk = iommu_pclk;
 217         drvdata->clk = iommu_clk;
 218         drvdata->base = regs_base;
 219         drvdata->irq = irq;
 220         drvdata->ncb = iommu_dev->ncb;
 221
 222         pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
 223                 iommu_dev->name, regs_base, irq, iommu_dev->ncb);
 224
 225         platform_set_drvdata(pdev, drvdata);
 226
 227         clk_disable(iommu_clk);
 228
 229         clk_disable(iommu_pclk);
 230
 231         return 0;
 232 fail_clk:
 233         if (iommu_clk) {
 234                 clk_disable(iommu_clk);
 235                 clk_put(iommu_clk);
 236         }
 237 fail_pclk:
 238         clk_disable_unprepare(iommu_pclk);
 239 fail_enable:
 240         clk_put(iommu_pclk);
 241 fail:
 242         kfree(drvdata);
 243         return ret;
 244 }
 245
 246 static int msm_iommu_remove(struct platform_device *pdev)
 247 {
 248         struct msm_iommu_drvdata *drv = NULL;
 249
 250         drv = platform_get_drvdata(pdev);
 251         if (drv) {
 252                 if (drv->clk) {
 253                         clk_unprepare(drv->clk);
 254                         clk_put(drv->clk);
 255                 }
 256                 clk_unprepare(drv->pclk);
 257                 clk_put(drv->pclk);
 258                 memset(drv, 0, sizeof(*drv));
 259                 kfree(drv);
 260         }
 261         return 0;
 262 }
 263
 264 static int msm_iommu_ctx_probe(struct platform_device *pdev)
 265 {
 266         struct msm_iommu_ctx_dev *c = dev_get_platdata(&pdev->dev);
 267         struct msm_iommu_drvdata *drvdata;
 268         struct msm_iommu_ctx_drvdata *ctx_drvdata;
 269         int i, ret;
 270
 271         if (!c || !pdev->dev.parent)
 272                 return -EINVAL;
 273
 274         drvdata = dev_get_drvdata(pdev->dev.parent);
 275         if (!drvdata)
 276                 return -ENODEV;
 277
 278         ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
 279         if (!ctx_drvdata)
 280                 return -ENOMEM;
 281
 282         ctx_drvdata->num = c->num;
 283         ctx_drvdata->pdev = pdev;
 284
 285         INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
 286         platform_set_drvdata(pdev, ctx_drvdata);
 287
 288         ret = clk_prepare_enable(drvdata->pclk);
 289         if (ret)
 290                 goto fail;
 291
 292         if (drvdata->clk) {
 293                 ret = clk_prepare_enable(drvdata->clk);
 294                 if (ret) {
 295                         clk_disable_unprepare(drvdata->pclk);
 296                         goto fail;
 297                 }
 298         }
 299
 300         /* Program the M2V tables for this context */
 301         for (i = 0; i < MAX_NUM_MIDS; i++) {
 302                 int mid = c->mids[i];
 303                 if (mid == -1)
 304                         break;
 305
 306                 SET_M2VCBR_N(drvdata->base, mid, 0);
 307                 SET_CBACR_N(drvdata->base, c->num, 0);
 308
 309                 /* Set VMID = 0 */
 310                 SET_VMID(drvdata->base, mid, 0);
 311
 312                 /* Set the context number for that MID to this context */
 313                 SET_CBNDX(drvdata->base, mid, c->num);
 314
 315                 /* Set MID associated with this context bank to 0*/
 316                 SET_CBVMID(drvdata->base, c->num, 0);
 317
 318                 /* Set the ASID for TLB tagging for this context */
 319                 SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
 320
 321                 /* Set security bit override to be Non-secure */
 322                 SET_NSCFG(drvdata->base, mid, 3);
 323         }
 324
 325         clk_disable(drvdata->clk);
 326         clk_disable(drvdata->pclk);
 327
 328         dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
 329         return 0;
 330 fail:
 331         kfree(ctx_drvdata);
 332         return ret;
 333 }
 334
 335 static int msm_iommu_ctx_remove(struct platform_device *pdev)
 336 {
 337         struct msm_iommu_ctx_drvdata *drv = NULL;
 338         drv = platform_get_drvdata(pdev);
 339         if (drv) {
 340                 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
 341                 kfree(drv);
 342         }
 343         return 0;
 344 }
 345
 346 static struct platform_driver msm_iommu_driver = {
 347         .driver = {
 348                 .name   = "msm_iommu",
 349         },
 350         .probe          = msm_iommu_probe,
 351         .remove         = msm_iommu_remove,
 352 };
 353
 354 static struct platform_driver msm_iommu_ctx_driver = {
 355         .driver = {
 356                 .name   = "msm_iommu_ctx",
 357         },
 358         .probe          = msm_iommu_ctx_probe,
 359         .remove         = msm_iommu_ctx_remove,
 360 };
 361
 362 static int __init msm_iommu_driver_init(void)
 363 {
 364         int ret;
 365         ret = platform_driver_register(&msm_iommu_driver);
 366         if (ret != 0) {
 367                 pr_err("Failed to register IOMMU driver\n");
 368                 goto error;
 369         }
 370
 371         ret = platform_driver_register(&msm_iommu_ctx_driver);
 372         if (ret != 0) {
 373                 platform_driver_unregister(&msm_iommu_driver);
 374                 pr_err("Failed to register IOMMU context driver\n");
 375                 goto error;
 376         }
 377
 378 error:
 379         return ret;
 380 }
 381
 382 static void __exit msm_iommu_driver_exit(void)
 383 {
 384         platform_driver_unregister(&msm_iommu_ctx_driver);
 385         platform_driver_unregister(&msm_iommu_driver);
 386 }
 387
 388 subsys_initcall(msm_iommu_driver_init);
 389 module_exit(msm_iommu_driver_exit);
 390
 391 MODULE_LICENSE("GPL v2");
 392 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");