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 <mach/iommu_hw-8xxx.h>
  31 #include <mach/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, *r2;
 131         struct clk *iommu_clk;
 132         struct clk *iommu_pclk;
 133         struct msm_iommu_drvdata *drvdata;
 134         struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
 135         void __iomem *regs_base;
 136         resource_size_t len;
 137         int ret, irq, par;
 138
 139         if (pdev->id == -1) {
 140                 msm_iommu_root_dev = pdev;
 141                 return 0;
 142         }
 143
 144         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
 145
 146         if (!drvdata) {
 147                 ret = -ENOMEM;
 148                 goto fail;
 149         }
 150
 151         if (!iommu_dev) {
 152                 ret = -ENODEV;
 153                 goto fail;
 154         }
 155
 156         iommu_pclk = clk_get(NULL, "smmu_pclk");
 157         if (IS_ERR(iommu_pclk)) {
 158                 ret = -ENODEV;
 159                 goto fail;
 160         }
 161
 162         ret = clk_prepare_enable(iommu_pclk);
 163         if (ret)
 164                 goto fail_enable;
 165
 166         iommu_clk = clk_get(&pdev->dev, "iommu_clk");
 167
 168         if (!IS_ERR(iommu_clk)) {
 169                 if (clk_get_rate(iommu_clk) == 0)
 170                         clk_set_rate(iommu_clk, 1);
 171
 172                 ret = clk_prepare_enable(iommu_clk);
 173                 if (ret) {
 174                         clk_put(iommu_clk);
 175                         goto fail_pclk;
 176                 }
 177         } else
 178                 iommu_clk = NULL;
 179
 180         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
 181
 182         if (!r) {
 183                 ret = -ENODEV;
 184                 goto fail_clk;
 185         }
 186
 187         len = resource_size(r);
 188
 189         r2 = request_mem_region(r->start, len, r->name);
 190         if (!r2) {
 191                 pr_err("Could not request memory region: start=%p, len=%d\n",
 192                                                         (void *) r->start, len);
 193                 ret = -EBUSY;
 194                 goto fail_clk;
 195         }
 196
 197         regs_base = ioremap(r2->start, len);
 198
 199         if (!regs_base) {
 200                 pr_err("Could not ioremap: start=%p, len=%d\n",
 201                          (void *) r2->start, len);
 202                 ret = -EBUSY;
 203                 goto fail_mem;
 204         }
 205
 206         irq = platform_get_irq_byname(pdev, "secure_irq");
 207         if (irq < 0) {
 208                 ret = -ENODEV;
 209                 goto fail_io;
 210         }
 211
 212         msm_iommu_reset(regs_base, iommu_dev->ncb);
 213
 214         SET_M(regs_base, 0, 1);
 215         SET_PAR(regs_base, 0, 0);
 216         SET_V2PCFG(regs_base, 0, 1);
 217         SET_V2PPR(regs_base, 0, 0);
 218         par = GET_PAR(regs_base, 0);
 219         SET_V2PCFG(regs_base, 0, 0);
 220         SET_M(regs_base, 0, 0);
 221
 222         if (!par) {
 223                 pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
 224                 ret = -ENODEV;
 225                 goto fail_io;
 226         }
 227
 228         ret = request_irq(irq, msm_iommu_fault_handler, 0,
 229                         "msm_iommu_secure_irpt_handler", drvdata);
 230         if (ret) {
 231                 pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
 232                 goto fail_io;
 233         }
 234
 235
 236         drvdata->pclk = iommu_pclk;
 237         drvdata->clk = iommu_clk;
 238         drvdata->base = regs_base;
 239         drvdata->irq = irq;
 240         drvdata->ncb = iommu_dev->ncb;
 241
 242         pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
 243                 iommu_dev->name, regs_base, irq, iommu_dev->ncb);
 244
 245         platform_set_drvdata(pdev, drvdata);
 246
 247         if (iommu_clk)
 248                 clk_disable(iommu_clk);
 249
 250         clk_disable(iommu_pclk);
 251
 252         return 0;
 253 fail_io:
 254         iounmap(regs_base);
 255 fail_mem:
 256         release_mem_region(r->start, len);
 257 fail_clk:
 258         if (iommu_clk) {
 259                 clk_disable(iommu_clk);
 260                 clk_put(iommu_clk);
 261         }
 262 fail_pclk:
 263         clk_disable_unprepare(iommu_pclk);
 264 fail_enable:
 265         clk_put(iommu_pclk);
 266 fail:
 267         kfree(drvdata);
 268         return ret;
 269 }
 270
 271 static int msm_iommu_remove(struct platform_device *pdev)
 272 {
 273         struct msm_iommu_drvdata *drv = NULL;
 274
 275         drv = platform_get_drvdata(pdev);
 276         if (drv) {
 277                 if (drv->clk) {
 278                         clk_unprepare(drv->clk);
 279                         clk_put(drv->clk);
 280                 }
 281                 clk_unprepare(drv->pclk);
 282                 clk_put(drv->pclk);
 283                 memset(drv, 0, sizeof(*drv));
 284                 kfree(drv);
 285                 platform_set_drvdata(pdev, NULL);
 286         }
 287         return 0;
 288 }
 289
 290 static int msm_iommu_ctx_probe(struct platform_device *pdev)
 291 {
 292         struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
 293         struct msm_iommu_drvdata *drvdata;
 294         struct msm_iommu_ctx_drvdata *ctx_drvdata;
 295         int i, ret;
 296
 297         if (!c || !pdev->dev.parent)
 298                 return -EINVAL;
 299
 300         drvdata = dev_get_drvdata(pdev->dev.parent);
 301         if (!drvdata)
 302                 return -ENODEV;
 303
 304         ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
 305         if (!ctx_drvdata)
 306                 return -ENOMEM;
 307
 308         ctx_drvdata->num = c->num;
 309         ctx_drvdata->pdev = pdev;
 310
 311         INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
 312         platform_set_drvdata(pdev, ctx_drvdata);
 313
 314         ret = clk_prepare_enable(drvdata->pclk);
 315         if (ret)
 316                 goto fail;
 317
 318         if (drvdata->clk) {
 319                 ret = clk_prepare_enable(drvdata->clk);
 320                 if (ret) {
 321                         clk_disable_unprepare(drvdata->pclk);
 322                         goto fail;
 323                 }
 324         }
 325
 326         /* Program the M2V tables for this context */
 327         for (i = 0; i < MAX_NUM_MIDS; i++) {
 328                 int mid = c->mids[i];
 329                 if (mid == -1)
 330                         break;
 331
 332                 SET_M2VCBR_N(drvdata->base, mid, 0);
 333                 SET_CBACR_N(drvdata->base, c->num, 0);
 334
 335                 /* Set VMID = 0 */
 336                 SET_VMID(drvdata->base, mid, 0);
 337
 338                 /* Set the context number for that MID to this context */
 339                 SET_CBNDX(drvdata->base, mid, c->num);
 340
 341                 /* Set MID associated with this context bank to 0*/
 342                 SET_CBVMID(drvdata->base, c->num, 0);
 343
 344                 /* Set the ASID for TLB tagging for this context */
 345                 SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
 346
 347                 /* Set security bit override to be Non-secure */
 348                 SET_NSCFG(drvdata->base, mid, 3);
 349         }
 350
 351         if (drvdata->clk)
 352                 clk_disable(drvdata->clk);
 353         clk_disable(drvdata->pclk);
 354
 355         dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
 356         return 0;
 357 fail:
 358         kfree(ctx_drvdata);
 359         return ret;
 360 }
 361
 362 static int msm_iommu_ctx_remove(struct platform_device *pdev)
 363 {
 364         struct msm_iommu_ctx_drvdata *drv = NULL;
 365         drv = platform_get_drvdata(pdev);
 366         if (drv) {
 367                 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
 368                 kfree(drv);
 369                 platform_set_drvdata(pdev, NULL);
 370         }
 371         return 0;
 372 }
 373
 374 static struct platform_driver msm_iommu_driver = {
 375         .driver = {
 376                 .name   = "msm_iommu",
 377         },
 378         .probe          = msm_iommu_probe,
 379         .remove         = msm_iommu_remove,
 380 };
 381
 382 static struct platform_driver msm_iommu_ctx_driver = {
 383         .driver = {
 384                 .name   = "msm_iommu_ctx",
 385         },
 386         .probe          = msm_iommu_ctx_probe,
 387         .remove         = msm_iommu_ctx_remove,
 388 };
 389
 390 static int __init msm_iommu_driver_init(void)
 391 {
 392         int ret;
 393         ret = platform_driver_register(&msm_iommu_driver);
 394         if (ret != 0) {
 395                 pr_err("Failed to register IOMMU driver\n");
 396                 goto error;
 397         }
 398
 399         ret = platform_driver_register(&msm_iommu_ctx_driver);
 400         if (ret != 0) {
 401                 platform_driver_unregister(&msm_iommu_driver);
 402                 pr_err("Failed to register IOMMU context driver\n");
 403                 goto error;
 404         }
 405
 406 error:
 407         return ret;
 408 }
 409
 410 static void __exit msm_iommu_driver_exit(void)
 411 {
 412         platform_driver_unregister(&msm_iommu_ctx_driver);
 413         platform_driver_unregister(&msm_iommu_driver);
 414 }
 415
 416 subsys_initcall(msm_iommu_driver_init);
 417 module_exit(msm_iommu_driver_exit);
 418
 419 MODULE_LICENSE("GPL v2");
 420 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");