arch/arm/mach-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 #include <mach/clk.h>
  33
  34 struct iommu_ctx_iter_data {
  35         /* input */
  36         const char *name;
  37
  38         /* output */
  39         struct device *dev;
  40 };
  41
  42 static struct platform_device *msm_iommu_root_dev;
  43
  44 static int each_iommu_ctx(struct device *dev, void *data)
  45 {
  46         struct iommu_ctx_iter_data *res = data;
  47         struct msm_iommu_ctx_dev *c = dev->platform_data;
  48
  49         if (!res || !c || !c->name || !res->name)
  50                 return -EINVAL;
  51
  52         if (!strcmp(res->name, c->name)) {
  53                 res->dev = dev;
  54                 return 1;
  55         }
  56         return 0;
  57 }
  58
  59 static int each_iommu(struct device *dev, void *data)
  60 {
  61         return device_for_each_child(dev, data, each_iommu_ctx);
  62 }
  63
  64 struct device *msm_iommu_get_ctx(const char *ctx_name)
  65 {
  66         struct iommu_ctx_iter_data r;
  67         int found;
  68
  69         if (!msm_iommu_root_dev) {
  70                 pr_err("No root IOMMU device.\n");
  71                 goto fail;
  72         }
  73
  74         r.name = ctx_name;
  75         found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
  76
  77         if (!found) {
  78                 pr_err("Could not find context <%s>\n", ctx_name);
  79                 goto fail;
  80         }
  81
  82         return r.dev;
  83 fail:
  84         return NULL;
  85 }
  86 EXPORT_SYMBOL(msm_iommu_get_ctx);
  87
  88 static void msm_iommu_reset(void __iomem *base, int ncb)
  89 {
  90         int ctx;
  91
  92         SET_RPUE(base, 0);
  93         SET_RPUEIE(base, 0);
  94         SET_ESRRESTORE(base, 0);
  95         SET_TBE(base, 0);
  96         SET_CR(base, 0);
  97         SET_SPDMBE(base, 0);
  98         SET_TESTBUSCR(base, 0);
  99         SET_TLBRSW(base, 0);
 100         SET_GLOBAL_TLBIALL(base, 0);
 101         SET_RPU_ACR(base, 0);
 102         SET_TLBLKCRWE(base, 1);
 103
 104         for (ctx = 0; ctx < ncb; ctx++) {
 105                 SET_BPRCOSH(base, ctx, 0);
 106                 SET_BPRCISH(base, ctx, 0);
 107                 SET_BPRCNSH(base, ctx, 0);
 108                 SET_BPSHCFG(base, ctx, 0);
 109                 SET_BPMTCFG(base, ctx, 0);
 110                 SET_ACTLR(base, ctx, 0);
 111                 SET_SCTLR(base, ctx, 0);
 112                 SET_FSRRESTORE(base, ctx, 0);
 113                 SET_TTBR0(base, ctx, 0);
 114                 SET_TTBR1(base, ctx, 0);
 115                 SET_TTBCR(base, ctx, 0);
 116                 SET_BFBCR(base, ctx, 0);
 117                 SET_PAR(base, ctx, 0);
 118                 SET_FAR(base, ctx, 0);
 119                 SET_CTX_TLBIALL(base, ctx, 0);
 120                 SET_TLBFLPTER(base, ctx, 0);
 121                 SET_TLBSLPTER(base, ctx, 0);
 122                 SET_TLBLKCR(base, ctx, 0);
 123                 SET_PRRR(base, ctx, 0);
 124                 SET_NMRR(base, ctx, 0);
 125                 SET_CONTEXTIDR(base, ctx, 0);
 126         }
 127 }
 128
 129 static int msm_iommu_probe(struct platform_device *pdev)
 130 {
 131         struct resource *r, *r2;
 132         struct clk *iommu_clk;
 133         struct clk *iommu_pclk;
 134         struct msm_iommu_drvdata *drvdata;
 135         struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;
 136         void __iomem *regs_base;
 137         resource_size_t len;
 138         int ret, irq, par;
 139
 140         if (pdev->id == -1) {
 141                 msm_iommu_root_dev = pdev;
 142                 return 0;
 143         }
 144
 145         drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
 146
 147         if (!drvdata) {
 148                 ret = -ENOMEM;
 149                 goto fail;
 150         }
 151
 152         if (!iommu_dev) {
 153                 ret = -ENODEV;
 154                 goto fail;
 155         }
 156
 157         iommu_pclk = clk_get(NULL, "smmu_pclk");
 158         if (IS_ERR(iommu_pclk)) {
 159                 ret = -ENODEV;
 160                 goto fail;
 161         }
 162
 163         ret = clk_enable(iommu_pclk);
 164         if (ret)
 165                 goto fail_enable;
 166
 167         iommu_clk = clk_get(&pdev->dev, "iommu_clk");
 168
 169         if (!IS_ERR(iommu_clk)) {
 170                 if (clk_get_rate(iommu_clk) == 0)
 171                         clk_set_min_rate(iommu_clk, 1);
 172
 173                 ret = clk_enable(iommu_clk);
 174                 if (ret) {
 175                         clk_put(iommu_clk);
 176                         goto fail_pclk;
 177                 }
 178         } else
 179                 iommu_clk = NULL;
 180
 181         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
 182
 183         if (!r) {
 184                 ret = -ENODEV;
 185                 goto fail_clk;
 186         }
 187
 188         len = resource_size(r);
 189
 190         r2 = request_mem_region(r->start, len, r->name);
 191         if (!r2) {
 192                 pr_err("Could not request memory region: start=%p, len=%d\n",
 193                                                         (void *) r->start, len);
 194                 ret = -EBUSY;
 195                 goto fail_clk;
 196         }
 197
 198         regs_base = ioremap(r2->start, len);
 199
 200         if (!regs_base) {
 201                 pr_err("Could not ioremap: start=%p, len=%d\n",
 202                          (void *) r2->start, len);
 203                 ret = -EBUSY;
 204                 goto fail_mem;
 205         }
 206
 207         irq = platform_get_irq_byname(pdev, "secure_irq");
 208         if (irq < 0) {
 209                 ret = -ENODEV;
 210                 goto fail_io;
 211         }
 212
 213         msm_iommu_reset(regs_base, iommu_dev->ncb);
 214
 215         SET_M(regs_base, 0, 1);
 216         SET_PAR(regs_base, 0, 0);
 217         SET_V2PCFG(regs_base, 0, 1);
 218         SET_V2PPR(regs_base, 0, 0);
 219         par = GET_PAR(regs_base, 0);
 220         SET_V2PCFG(regs_base, 0, 0);
 221         SET_M(regs_base, 0, 0);
 222
 223         if (!par) {
 224                 pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
 225                 ret = -ENODEV;
 226                 goto fail_io;
 227         }
 228
 229         ret = request_irq(irq, msm_iommu_fault_handler, 0,
 230                         "msm_iommu_secure_irpt_handler", drvdata);
 231         if (ret) {
 232                 pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
 233                 goto fail_io;
 234         }
 235
 236
 237         drvdata->pclk = iommu_pclk;
 238         drvdata->clk = iommu_clk;
 239         drvdata->base = regs_base;
 240         drvdata->irq = irq;
 241         drvdata->ncb = iommu_dev->ncb;
 242
 243         pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
 244                 iommu_dev->name, regs_base, irq, iommu_dev->ncb);
 245
 246         platform_set_drvdata(pdev, drvdata);
 247
 248         if (iommu_clk)
 249                 clk_disable(iommu_clk);
 250
 251         clk_disable(iommu_pclk);
 252
 253         return 0;
 254 fail_io:
 255         iounmap(regs_base);
 256 fail_mem:
 257         release_mem_region(r->start, len);
 258 fail_clk:
 259         if (iommu_clk) {
 260                 clk_disable(iommu_clk);
 261                 clk_put(iommu_clk);
 262         }
 263 fail_pclk:
 264         clk_disable(iommu_pclk);
 265 fail_enable:
 266         clk_put(iommu_pclk);
 267 fail:
 268         kfree(drvdata);
 269         return ret;
 270 }
 271
 272 static int msm_iommu_remove(struct platform_device *pdev)
 273 {
 274         struct msm_iommu_drvdata *drv = NULL;
 275
 276         drv = platform_get_drvdata(pdev);
 277         if (drv) {
 278                 if (drv->clk)
 279                         clk_put(drv->clk);
 280                 clk_put(drv->pclk);
 281                 memset(drv, 0, sizeof(*drv));
 282                 kfree(drv);
 283                 platform_set_drvdata(pdev, NULL);
 284         }
 285         return 0;
 286 }
 287
 288 static int msm_iommu_ctx_probe(struct platform_device *pdev)
 289 {
 290         struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
 291         struct msm_iommu_drvdata *drvdata;
 292         struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
 293         int i, ret;
 294         if (!c || !pdev->dev.parent) {
 295                 ret = -EINVAL;
 296                 goto fail;
 297         }
 298
 299         drvdata = dev_get_drvdata(pdev->dev.parent);
 300
 301         if (!drvdata) {
 302                 ret = -ENODEV;
 303                 goto fail;
 304         }
 305
 306         ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
 307         if (!ctx_drvdata) {
 308                 ret = -ENOMEM;
 309                 goto fail;
 310         }
 311         ctx_drvdata->num = c->num;
 312         ctx_drvdata->pdev = pdev;
 313
 314         INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
 315         platform_set_drvdata(pdev, ctx_drvdata);
 316
 317         ret = clk_enable(drvdata->pclk);
 318         if (ret)
 319                 goto fail;
 320
 321         if (drvdata->clk) {
 322                 ret = clk_enable(drvdata->clk);
 323                 if (ret) {
 324                         clk_disable(drvdata->pclk);
 325                         goto fail;
 326                 }
 327         }
 328
 329         /* Program the M2V tables for this context */
 330         for (i = 0; i < MAX_NUM_MIDS; i++) {
 331                 int mid = c->mids[i];
 332                 if (mid == -1)
 333                         break;
 334
 335                 SET_M2VCBR_N(drvdata->base, mid, 0);
 336                 SET_CBACR_N(drvdata->base, c->num, 0);
 337
 338                 /* Set VMID = 0 */
 339                 SET_VMID(drvdata->base, mid, 0);
 340
 341                 /* Set the context number for that MID to this context */
 342                 SET_CBNDX(drvdata->base, mid, c->num);
 343
 344                 /* Set MID associated with this context bank to 0*/
 345                 SET_CBVMID(drvdata->base, c->num, 0);
 346
 347                 /* Set the ASID for TLB tagging for this context */
 348                 SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
 349
 350                 /* Set security bit override to be Non-secure */
 351                 SET_NSCFG(drvdata->base, mid, 3);
 352         }
 353
 354         if (drvdata->clk)
 355                 clk_disable(drvdata->clk);
 356         clk_disable(drvdata->pclk);
 357
 358         dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
 359         return 0;
 360 fail:
 361         kfree(ctx_drvdata);
 362         return ret;
 363 }
 364
 365 static int msm_iommu_ctx_remove(struct platform_device *pdev)
 366 {
 367         struct msm_iommu_ctx_drvdata *drv = NULL;
 368         drv = platform_get_drvdata(pdev);
 369         if (drv) {
 370                 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
 371                 kfree(drv);
 372                 platform_set_drvdata(pdev, NULL);
 373         }
 374         return 0;
 375 }
 376
 377 static struct platform_driver msm_iommu_driver = {
 378         .driver = {
 379                 .name   = "msm_iommu",
 380         },
 381         .probe          = msm_iommu_probe,
 382         .remove         = msm_iommu_remove,
 383 };
 384
 385 static struct platform_driver msm_iommu_ctx_driver = {
 386         .driver = {
 387                 .name   = "msm_iommu_ctx",
 388         },
 389         .probe          = msm_iommu_ctx_probe,
 390         .remove         = msm_iommu_ctx_remove,
 391 };
 392
 393 static int __init msm_iommu_driver_init(void)
 394 {
 395         int ret;
 396         ret = platform_driver_register(&msm_iommu_driver);
 397         if (ret != 0) {
 398                 pr_err("Failed to register IOMMU driver\n");
 399                 goto error;
 400         }
 401
 402         ret = platform_driver_register(&msm_iommu_ctx_driver);
 403         if (ret != 0) {
 404                 pr_err("Failed to register IOMMU context driver\n");
 405                 goto error;
 406         }
 407
 408 error:
 409         return ret;
 410 }
 411
 412 static void __exit msm_iommu_driver_exit(void)
 413 {
 414         platform_driver_unregister(&msm_iommu_ctx_driver);
 415         platform_driver_unregister(&msm_iommu_driver);
 416 }
 417
 418 subsys_initcall(msm_iommu_driver_init);
 419 module_exit(msm_iommu_driver_exit);
 420
 421 MODULE_LICENSE("GPL v2");
 422 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");