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
each_iommu_ctx(struct device * dev,void * data)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
each_iommu(struct device * dev,void * data)58 static int each_iommu(struct device *dev, void *data)
59 {
60 return device_for_each_child(dev, data, each_iommu_ctx);
61 }
62
msm_iommu_get_ctx(const char * ctx_name)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
msm_iommu_reset(void __iomem * base,int ncb)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
msm_iommu_probe(struct platform_device * pdev)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
msm_iommu_remove(struct platform_device * pdev)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
msm_iommu_ctx_probe(struct platform_device * pdev)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
msm_iommu_ctx_remove(struct platform_device * pdev)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
msm_iommu_driver_init(void)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
msm_iommu_driver_exit(void)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