blob: 6ba3514771322a387d864582e326a947361f655f [file] [log] [blame]
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -08001/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -07002 *
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
33struct iommu_ctx_iter_data {
34 /* input */
35 const char *name;
36
37 /* output */
38 struct device *dev;
39};
40
41static struct platform_device *msm_iommu_root_dev;
42
43static 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
58static int each_iommu(struct device *dev, void *data)
59{
60 return device_for_each_child(dev, data, each_iommu_ctx);
61}
62
63struct 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;
82fail:
83 return NULL;
84}
85EXPORT_SYMBOL(msm_iommu_get_ctx);
86
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -080087static void msm_iommu_reset(void __iomem *base, int ncb)
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -070088{
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -080089 int ctx;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -070090
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);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700102
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
128static int msm_iommu_probe(struct platform_device *pdev)
129{
Vasiliy Kulikova86c44d2010-10-17 18:51:37 +0400130 struct resource *r, *r2;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700131 struct clk *iommu_clk;
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800132 struct clk *iommu_pclk;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700133 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;
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800137 int ret, irq, par;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700138
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800139 if (pdev->id == -1) {
140 msm_iommu_root_dev = pdev;
141 return 0;
142 }
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700143
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800144 drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700145
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800146 if (!drvdata) {
147 ret = -ENOMEM;
148 goto fail;
149 }
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700150
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800151 if (!iommu_dev) {
152 ret = -ENODEV;
153 goto fail;
154 }
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700155
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800156 iommu_pclk = clk_get(NULL, "smmu_pclk");
157 if (IS_ERR(iommu_pclk)) {
158 ret = -ENODEV;
159 goto fail;
160 }
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700161
Stephen Boyd1107b172013-06-17 10:43:12 -0700162 ret = clk_prepare_enable(iommu_pclk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800163 if (ret)
164 goto fail_enable;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700165
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800166 iommu_clk = clk_get(&pdev->dev, "iommu_clk");
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700167
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800168 if (!IS_ERR(iommu_clk)) {
169 if (clk_get_rate(iommu_clk) == 0)
Stephen Boyd8d214152013-06-17 10:43:13 -0700170 clk_set_rate(iommu_clk, 1);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700171
Stephen Boyd1107b172013-06-17 10:43:12 -0700172 ret = clk_prepare_enable(iommu_clk);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700173 if (ret) {
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800174 clk_put(iommu_clk);
175 goto fail_pclk;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700176 }
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800177 } else
178 iommu_clk = NULL;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700179
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800180 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase");
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700181
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800182 if (!r) {
183 ret = -ENODEV;
184 goto fail_clk;
185 }
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700186
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800187 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
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800212 msm_iommu_reset(regs_base, iommu_dev->ncb);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800213
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800214 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);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800224 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
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800235
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800236 drvdata->pclk = iommu_pclk;
237 drvdata->clk = iommu_clk;
238 drvdata->base = regs_base;
239 drvdata->irq = irq;
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800240 drvdata->ncb = iommu_dev->ncb;
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800241
242 pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
Stepan Moskovchenkoa43d8c12011-02-24 18:00:42 -0800243 iommu_dev->name, regs_base, irq, iommu_dev->ncb);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700244
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800245 platform_set_drvdata(pdev, drvdata);
246
247 if (iommu_clk)
248 clk_disable(iommu_clk);
249
250 clk_disable(iommu_pclk);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700251
252 return 0;
Vasiliy Kulikova86c44d2010-10-17 18:51:37 +0400253fail_io:
254 iounmap(regs_base);
255fail_mem:
256 release_mem_region(r->start, len);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800257fail_clk:
258 if (iommu_clk) {
259 clk_disable(iommu_clk);
260 clk_put(iommu_clk);
261 }
262fail_pclk:
Stephen Boyd1107b172013-06-17 10:43:12 -0700263 clk_disable_unprepare(iommu_pclk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800264fail_enable:
265 clk_put(iommu_pclk);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700266fail:
267 kfree(drvdata);
268 return ret;
269}
270
271static 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) {
Stephen Boyd1107b172013-06-17 10:43:12 -0700277 if (drv->clk) {
278 clk_unprepare(drv->clk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800279 clk_put(drv->clk);
Stephen Boyd1107b172013-06-17 10:43:12 -0700280 }
281 clk_unprepare(drv->pclk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800282 clk_put(drv->pclk);
283 memset(drv, 0, sizeof(*drv));
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700284 kfree(drv);
285 platform_set_drvdata(pdev, NULL);
286 }
287 return 0;
288}
289
290static 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;
Libo Chen34e3a58c2013-07-08 15:59:47 -0700294 struct msm_iommu_ctx_drvdata *ctx_drvdata;
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800295 int i, ret;
Libo Chen34e3a58c2013-07-08 15:59:47 -0700296
297 if (!c || !pdev->dev.parent)
298 return -EINVAL;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700299
300 drvdata = dev_get_drvdata(pdev->dev.parent);
Libo Chen34e3a58c2013-07-08 15:59:47 -0700301 if (!drvdata)
302 return -ENODEV;
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700303
304 ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
Libo Chen34e3a58c2013-07-08 15:59:47 -0700305 if (!ctx_drvdata)
306 return -ENOMEM;
307
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700308 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
Stephen Boyd1107b172013-06-17 10:43:12 -0700314 ret = clk_prepare_enable(drvdata->pclk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800315 if (ret)
316 goto fail;
317
318 if (drvdata->clk) {
Stephen Boyd1107b172013-06-17 10:43:12 -0700319 ret = clk_prepare_enable(drvdata->clk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800320 if (ret) {
Stephen Boyd1107b172013-06-17 10:43:12 -0700321 clk_disable_unprepare(drvdata->pclk);
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800322 goto fail;
323 }
324 }
325
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700326 /* 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
Stepan Moskovchenko2e8c8ba2011-02-24 18:00:41 -0800335 /* Set VMID = 0 */
336 SET_VMID(drvdata->base, mid, 0);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700337
338 /* Set the context number for that MID to this context */
339 SET_CBNDX(drvdata->base, mid, c->num);
340
Stepan Moskovchenko2e8c8ba2011-02-24 18:00:41 -0800341 /* 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);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700346
347 /* Set security bit override to be Non-secure */
348 SET_NSCFG(drvdata->base, mid, 3);
349 }
350
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800351 if (drvdata->clk)
352 clk_disable(drvdata->clk);
353 clk_disable(drvdata->pclk);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700354
Stepan Moskovchenkob61401a2011-02-28 16:03:02 -0800355 dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700356 return 0;
357fail:
358 kfree(ctx_drvdata);
359 return ret;
360}
361
362static 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
374static 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
382static 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
Stepan Moskovchenko516cbc72010-11-12 19:29:53 -0800390static int __init msm_iommu_driver_init(void)
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700391{
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) {
Libo Chen34e3a58c2013-07-08 15:59:47 -0700401 platform_driver_unregister(&msm_iommu_driver);
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700402 pr_err("Failed to register IOMMU context driver\n");
403 goto error;
404 }
405
406error:
407 return ret;
408}
409
Stepan Moskovchenko516cbc72010-11-12 19:29:53 -0800410static void __exit msm_iommu_driver_exit(void)
Stepan Moskovchenkoc6a59512010-08-24 18:32:38 -0700411{
412 platform_driver_unregister(&msm_iommu_ctx_driver);
413 platform_driver_unregister(&msm_iommu_driver);
414}
415
416subsys_initcall(msm_iommu_driver_init);
417module_exit(msm_iommu_driver_exit);
418
419MODULE_LICENSE("GPL v2");
420MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");