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Linux/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, *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         }
286         return 0;
287 }
288 
289 static int msm_iommu_ctx_probe(struct platform_device *pdev)
290 {
291         struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
292         struct msm_iommu_drvdata *drvdata;
293         struct msm_iommu_ctx_drvdata *ctx_drvdata;
294         int i, ret;
295 
296         if (!c || !pdev->dev.parent)
297                 return -EINVAL;
298 
299         drvdata = dev_get_drvdata(pdev->dev.parent);
300         if (!drvdata)
301                 return -ENODEV;
302 
303         ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
304         if (!ctx_drvdata)
305                 return -ENOMEM;
306 
307         ctx_drvdata->num = c->num;
308         ctx_drvdata->pdev = pdev;
309 
310         INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
311         platform_set_drvdata(pdev, ctx_drvdata);
312 
313         ret = clk_prepare_enable(drvdata->pclk);
314         if (ret)
315                 goto fail;
316 
317         if (drvdata->clk) {
318                 ret = clk_prepare_enable(drvdata->clk);
319                 if (ret) {
320                         clk_disable_unprepare(drvdata->pclk);
321                         goto fail;
322                 }
323         }
324 
325         /* Program the M2V tables for this context */
326         for (i = 0; i < MAX_NUM_MIDS; i++) {
327                 int mid = c->mids[i];
328                 if (mid == -1)
329                         break;
330 
331                 SET_M2VCBR_N(drvdata->base, mid, 0);
332                 SET_CBACR_N(drvdata->base, c->num, 0);
333 
334                 /* Set VMID = 0 */
335                 SET_VMID(drvdata->base, mid, 0);
336 
337                 /* Set the context number for that MID to this context */
338                 SET_CBNDX(drvdata->base, mid, c->num);
339 
340                 /* Set MID associated with this context bank to 0*/
341                 SET_CBVMID(drvdata->base, c->num, 0);
342 
343                 /* Set the ASID for TLB tagging for this context */
344                 SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
345 
346                 /* Set security bit override to be Non-secure */
347                 SET_NSCFG(drvdata->base, mid, 3);
348         }
349 
350         if (drvdata->clk)
351                 clk_disable(drvdata->clk);
352         clk_disable(drvdata->pclk);
353 
354         dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
355         return 0;
356 fail:
357         kfree(ctx_drvdata);
358         return ret;
359 }
360 
361 static int msm_iommu_ctx_remove(struct platform_device *pdev)
362 {
363         struct msm_iommu_ctx_drvdata *drv = NULL;
364         drv = platform_get_drvdata(pdev);
365         if (drv) {
366                 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
367                 kfree(drv);
368         }
369         return 0;
370 }
371 
372 static struct platform_driver msm_iommu_driver = {
373         .driver = {
374                 .name   = "msm_iommu",
375         },
376         .probe          = msm_iommu_probe,
377         .remove         = msm_iommu_remove,
378 };
379 
380 static struct platform_driver msm_iommu_ctx_driver = {
381         .driver = {
382                 .name   = "msm_iommu_ctx",
383         },
384         .probe          = msm_iommu_ctx_probe,
385         .remove         = msm_iommu_ctx_remove,
386 };
387 
388 static int __init msm_iommu_driver_init(void)
389 {
390         int ret;
391         ret = platform_driver_register(&msm_iommu_driver);
392         if (ret != 0) {
393                 pr_err("Failed to register IOMMU driver\n");
394                 goto error;
395         }
396 
397         ret = platform_driver_register(&msm_iommu_ctx_driver);
398         if (ret != 0) {
399                 platform_driver_unregister(&msm_iommu_driver);
400                 pr_err("Failed to register IOMMU context driver\n");
401                 goto error;
402         }
403 
404 error:
405         return ret;
406 }
407 
408 static void __exit msm_iommu_driver_exit(void)
409 {
410         platform_driver_unregister(&msm_iommu_ctx_driver);
411         platform_driver_unregister(&msm_iommu_driver);
412 }
413 
414 subsys_initcall(msm_iommu_driver_init);
415 module_exit(msm_iommu_driver_exit);
416 
417 MODULE_LICENSE("GPL v2");
418 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");
419 

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