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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;
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         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         if (iommu_clk)
228                 clk_disable(iommu_clk);
229 
230         clk_disable(iommu_pclk);
231 
232         return 0;
233 fail_clk:
234         if (iommu_clk) {
235                 clk_disable(iommu_clk);
236                 clk_put(iommu_clk);
237         }
238 fail_pclk:
239         clk_disable_unprepare(iommu_pclk);
240 fail_enable:
241         clk_put(iommu_pclk);
242 fail:
243         kfree(drvdata);
244         return ret;
245 }
246 
247 static int msm_iommu_remove(struct platform_device *pdev)
248 {
249         struct msm_iommu_drvdata *drv = NULL;
250 
251         drv = platform_get_drvdata(pdev);
252         if (drv) {
253                 if (drv->clk) {
254                         clk_unprepare(drv->clk);
255                         clk_put(drv->clk);
256                 }
257                 clk_unprepare(drv->pclk);
258                 clk_put(drv->pclk);
259                 memset(drv, 0, sizeof(*drv));
260                 kfree(drv);
261         }
262         return 0;
263 }
264 
265 static int msm_iommu_ctx_probe(struct platform_device *pdev)
266 {
267         struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
268         struct msm_iommu_drvdata *drvdata;
269         struct msm_iommu_ctx_drvdata *ctx_drvdata;
270         int i, ret;
271 
272         if (!c || !pdev->dev.parent)
273                 return -EINVAL;
274 
275         drvdata = dev_get_drvdata(pdev->dev.parent);
276         if (!drvdata)
277                 return -ENODEV;
278 
279         ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
280         if (!ctx_drvdata)
281                 return -ENOMEM;
282 
283         ctx_drvdata->num = c->num;
284         ctx_drvdata->pdev = pdev;
285 
286         INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
287         platform_set_drvdata(pdev, ctx_drvdata);
288 
289         ret = clk_prepare_enable(drvdata->pclk);
290         if (ret)
291                 goto fail;
292 
293         if (drvdata->clk) {
294                 ret = clk_prepare_enable(drvdata->clk);
295                 if (ret) {
296                         clk_disable_unprepare(drvdata->pclk);
297                         goto fail;
298                 }
299         }
300 
301         /* Program the M2V tables for this context */
302         for (i = 0; i < MAX_NUM_MIDS; i++) {
303                 int mid = c->mids[i];
304                 if (mid == -1)
305                         break;
306 
307                 SET_M2VCBR_N(drvdata->base, mid, 0);
308                 SET_CBACR_N(drvdata->base, c->num, 0);
309 
310                 /* Set VMID = 0 */
311                 SET_VMID(drvdata->base, mid, 0);
312 
313                 /* Set the context number for that MID to this context */
314                 SET_CBNDX(drvdata->base, mid, c->num);
315 
316                 /* Set MID associated with this context bank to 0*/
317                 SET_CBVMID(drvdata->base, c->num, 0);
318 
319                 /* Set the ASID for TLB tagging for this context */
320                 SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);
321 
322                 /* Set security bit override to be Non-secure */
323                 SET_NSCFG(drvdata->base, mid, 3);
324         }
325 
326         if (drvdata->clk)
327                 clk_disable(drvdata->clk);
328         clk_disable(drvdata->pclk);
329 
330         dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
331         return 0;
332 fail:
333         kfree(ctx_drvdata);
334         return ret;
335 }
336 
337 static int msm_iommu_ctx_remove(struct platform_device *pdev)
338 {
339         struct msm_iommu_ctx_drvdata *drv = NULL;
340         drv = platform_get_drvdata(pdev);
341         if (drv) {
342                 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
343                 kfree(drv);
344         }
345         return 0;
346 }
347 
348 static struct platform_driver msm_iommu_driver = {
349         .driver = {
350                 .name   = "msm_iommu",
351         },
352         .probe          = msm_iommu_probe,
353         .remove         = msm_iommu_remove,
354 };
355 
356 static struct platform_driver msm_iommu_ctx_driver = {
357         .driver = {
358                 .name   = "msm_iommu_ctx",
359         },
360         .probe          = msm_iommu_ctx_probe,
361         .remove         = msm_iommu_ctx_remove,
362 };
363 
364 static int __init msm_iommu_driver_init(void)
365 {
366         int ret;
367         ret = platform_driver_register(&msm_iommu_driver);
368         if (ret != 0) {
369                 pr_err("Failed to register IOMMU driver\n");
370                 goto error;
371         }
372 
373         ret = platform_driver_register(&msm_iommu_ctx_driver);
374         if (ret != 0) {
375                 platform_driver_unregister(&msm_iommu_driver);
376                 pr_err("Failed to register IOMMU context driver\n");
377                 goto error;
378         }
379 
380 error:
381         return ret;
382 }
383 
384 static void __exit msm_iommu_driver_exit(void)
385 {
386         platform_driver_unregister(&msm_iommu_ctx_driver);
387         platform_driver_unregister(&msm_iommu_driver);
388 }
389 
390 subsys_initcall(msm_iommu_driver_init);
391 module_exit(msm_iommu_driver_exit);
392 
393 MODULE_LICENSE("GPL v2");
394 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");
395 

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