Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 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> |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 32 | #include <mach/clk.h> |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 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) |
| 89 | { |
| 90 | int ctx, ncb; |
| 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 | ncb = GET_NCB(base)+1; |
| 104 | |
| 105 | for (ctx = 0; ctx < ncb; ctx++) { |
| 106 | SET_BPRCOSH(base, ctx, 0); |
| 107 | SET_BPRCISH(base, ctx, 0); |
| 108 | SET_BPRCNSH(base, ctx, 0); |
| 109 | SET_BPSHCFG(base, ctx, 0); |
| 110 | SET_BPMTCFG(base, ctx, 0); |
| 111 | SET_ACTLR(base, ctx, 0); |
| 112 | SET_SCTLR(base, ctx, 0); |
| 113 | SET_FSRRESTORE(base, ctx, 0); |
| 114 | SET_TTBR0(base, ctx, 0); |
| 115 | SET_TTBR1(base, ctx, 0); |
| 116 | SET_TTBCR(base, ctx, 0); |
| 117 | SET_BFBCR(base, ctx, 0); |
| 118 | SET_PAR(base, ctx, 0); |
| 119 | SET_FAR(base, ctx, 0); |
| 120 | SET_CTX_TLBIALL(base, ctx, 0); |
| 121 | SET_TLBFLPTER(base, ctx, 0); |
| 122 | SET_TLBSLPTER(base, ctx, 0); |
| 123 | SET_TLBLKCR(base, ctx, 0); |
| 124 | SET_PRRR(base, ctx, 0); |
| 125 | SET_NMRR(base, ctx, 0); |
| 126 | SET_CONTEXTIDR(base, ctx, 0); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | static int msm_iommu_probe(struct platform_device *pdev) |
| 131 | { |
Vasiliy Kulikov | a86c44d | 2010-10-17 18:51:37 +0400 | [diff] [blame] | 132 | struct resource *r, *r2; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 133 | struct clk *iommu_clk; |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 134 | struct clk *iommu_pclk; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 135 | struct msm_iommu_drvdata *drvdata; |
| 136 | struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data; |
| 137 | void __iomem *regs_base; |
| 138 | resource_size_t len; |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 139 | int ret, ncb, nm2v, irq; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 140 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 141 | if (pdev->id == -1) { |
| 142 | msm_iommu_root_dev = pdev; |
| 143 | return 0; |
| 144 | } |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 145 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 146 | drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 147 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 148 | if (!drvdata) { |
| 149 | ret = -ENOMEM; |
| 150 | goto fail; |
| 151 | } |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 152 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 153 | if (!iommu_dev) { |
| 154 | ret = -ENODEV; |
| 155 | goto fail; |
| 156 | } |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 157 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 158 | iommu_pclk = clk_get(NULL, "smmu_pclk"); |
| 159 | if (IS_ERR(iommu_pclk)) { |
| 160 | ret = -ENODEV; |
| 161 | goto fail; |
| 162 | } |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 163 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 164 | ret = clk_enable(iommu_pclk); |
| 165 | if (ret) |
| 166 | goto fail_enable; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 167 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 168 | iommu_clk = clk_get(&pdev->dev, "iommu_clk"); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 169 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 170 | if (!IS_ERR(iommu_clk)) { |
| 171 | if (clk_get_rate(iommu_clk) == 0) |
| 172 | clk_set_min_rate(iommu_clk, 1); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 173 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 174 | ret = clk_enable(iommu_clk); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 175 | if (ret) { |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 176 | clk_put(iommu_clk); |
| 177 | goto fail_pclk; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 178 | } |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 179 | } else |
| 180 | iommu_clk = NULL; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 181 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 182 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase"); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 183 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 184 | if (!r) { |
| 185 | ret = -ENODEV; |
| 186 | goto fail_clk; |
| 187 | } |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 188 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 189 | len = resource_size(r); |
| 190 | |
| 191 | r2 = request_mem_region(r->start, len, r->name); |
| 192 | if (!r2) { |
| 193 | pr_err("Could not request memory region: start=%p, len=%d\n", |
| 194 | (void *) r->start, len); |
| 195 | ret = -EBUSY; |
| 196 | goto fail_clk; |
| 197 | } |
| 198 | |
| 199 | regs_base = ioremap(r2->start, len); |
| 200 | |
| 201 | if (!regs_base) { |
| 202 | pr_err("Could not ioremap: start=%p, len=%d\n", |
| 203 | (void *) r2->start, len); |
| 204 | ret = -EBUSY; |
| 205 | goto fail_mem; |
| 206 | } |
| 207 | |
| 208 | irq = platform_get_irq_byname(pdev, "secure_irq"); |
| 209 | if (irq < 0) { |
| 210 | ret = -ENODEV; |
| 211 | goto fail_io; |
| 212 | } |
| 213 | |
| 214 | mb(); |
| 215 | |
| 216 | if (GET_IDR(regs_base) == 0) { |
| 217 | pr_err("Invalid IDR value detected\n"); |
| 218 | ret = -ENODEV; |
| 219 | goto fail_io; |
| 220 | } |
| 221 | |
| 222 | ret = request_irq(irq, msm_iommu_fault_handler, 0, |
| 223 | "msm_iommu_secure_irpt_handler", drvdata); |
| 224 | if (ret) { |
| 225 | pr_err("Request IRQ %d failed with ret=%d\n", irq, ret); |
| 226 | goto fail_io; |
| 227 | } |
| 228 | |
| 229 | msm_iommu_reset(regs_base); |
| 230 | drvdata->pclk = iommu_pclk; |
| 231 | drvdata->clk = iommu_clk; |
| 232 | drvdata->base = regs_base; |
| 233 | drvdata->irq = irq; |
| 234 | |
| 235 | nm2v = GET_NM2VCBMT((unsigned long) regs_base); |
| 236 | ncb = GET_NCB((unsigned long) regs_base); |
| 237 | |
| 238 | pr_info("device %s mapped at %p, irq %d with %d ctx banks\n", |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 239 | iommu_dev->name, regs_base, irq, ncb+1); |
| 240 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 241 | platform_set_drvdata(pdev, drvdata); |
| 242 | |
| 243 | if (iommu_clk) |
| 244 | clk_disable(iommu_clk); |
| 245 | |
| 246 | clk_disable(iommu_pclk); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 247 | |
| 248 | return 0; |
Vasiliy Kulikov | a86c44d | 2010-10-17 18:51:37 +0400 | [diff] [blame] | 249 | fail_io: |
| 250 | iounmap(regs_base); |
| 251 | fail_mem: |
| 252 | release_mem_region(r->start, len); |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 253 | fail_clk: |
| 254 | if (iommu_clk) { |
| 255 | clk_disable(iommu_clk); |
| 256 | clk_put(iommu_clk); |
| 257 | } |
| 258 | fail_pclk: |
| 259 | clk_disable(iommu_pclk); |
| 260 | fail_enable: |
| 261 | clk_put(iommu_pclk); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 262 | fail: |
| 263 | kfree(drvdata); |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | static int msm_iommu_remove(struct platform_device *pdev) |
| 268 | { |
| 269 | struct msm_iommu_drvdata *drv = NULL; |
| 270 | |
| 271 | drv = platform_get_drvdata(pdev); |
| 272 | if (drv) { |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 273 | if (drv->clk) |
| 274 | clk_put(drv->clk); |
| 275 | clk_put(drv->pclk); |
| 276 | memset(drv, 0, sizeof(*drv)); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 277 | kfree(drv); |
| 278 | platform_set_drvdata(pdev, NULL); |
| 279 | } |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static int msm_iommu_ctx_probe(struct platform_device *pdev) |
| 284 | { |
| 285 | struct msm_iommu_ctx_dev *c = pdev->dev.platform_data; |
| 286 | struct msm_iommu_drvdata *drvdata; |
| 287 | struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL; |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 288 | int i, ret; |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 289 | if (!c || !pdev->dev.parent) { |
| 290 | ret = -EINVAL; |
| 291 | goto fail; |
| 292 | } |
| 293 | |
| 294 | drvdata = dev_get_drvdata(pdev->dev.parent); |
| 295 | |
| 296 | if (!drvdata) { |
| 297 | ret = -ENODEV; |
| 298 | goto fail; |
| 299 | } |
| 300 | |
| 301 | ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL); |
| 302 | if (!ctx_drvdata) { |
| 303 | ret = -ENOMEM; |
| 304 | goto fail; |
| 305 | } |
| 306 | ctx_drvdata->num = c->num; |
| 307 | ctx_drvdata->pdev = pdev; |
| 308 | |
| 309 | INIT_LIST_HEAD(&ctx_drvdata->attached_elm); |
| 310 | platform_set_drvdata(pdev, ctx_drvdata); |
| 311 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 312 | ret = clk_enable(drvdata->pclk); |
| 313 | if (ret) |
| 314 | goto fail; |
| 315 | |
| 316 | if (drvdata->clk) { |
| 317 | ret = clk_enable(drvdata->clk); |
| 318 | if (ret) { |
| 319 | clk_disable(drvdata->pclk); |
| 320 | goto fail; |
| 321 | } |
| 322 | } |
| 323 | |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 324 | /* Program the M2V tables for this context */ |
| 325 | for (i = 0; i < MAX_NUM_MIDS; i++) { |
| 326 | int mid = c->mids[i]; |
| 327 | if (mid == -1) |
| 328 | break; |
| 329 | |
| 330 | SET_M2VCBR_N(drvdata->base, mid, 0); |
| 331 | SET_CBACR_N(drvdata->base, c->num, 0); |
| 332 | |
Stepan Moskovchenko | 2e8c8ba | 2011-02-24 18:00:41 -0800 | [diff] [blame^] | 333 | /* Set VMID = 0 */ |
| 334 | SET_VMID(drvdata->base, mid, 0); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 335 | |
| 336 | /* Set the context number for that MID to this context */ |
| 337 | SET_CBNDX(drvdata->base, mid, c->num); |
| 338 | |
Stepan Moskovchenko | 2e8c8ba | 2011-02-24 18:00:41 -0800 | [diff] [blame^] | 339 | /* Set MID associated with this context bank to 0*/ |
| 340 | SET_CBVMID(drvdata->base, c->num, 0); |
| 341 | |
| 342 | /* Set the ASID for TLB tagging for this context */ |
| 343 | SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 344 | |
| 345 | /* Set security bit override to be Non-secure */ |
| 346 | SET_NSCFG(drvdata->base, mid, 3); |
| 347 | } |
| 348 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 349 | if (drvdata->clk) |
| 350 | clk_disable(drvdata->clk); |
| 351 | clk_disable(drvdata->pclk); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 352 | |
Stepan Moskovchenko | b61401a | 2011-02-28 16:03:02 -0800 | [diff] [blame] | 353 | dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num); |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 354 | return 0; |
| 355 | fail: |
| 356 | kfree(ctx_drvdata); |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | static int msm_iommu_ctx_remove(struct platform_device *pdev) |
| 361 | { |
| 362 | struct msm_iommu_ctx_drvdata *drv = NULL; |
| 363 | drv = platform_get_drvdata(pdev); |
| 364 | if (drv) { |
| 365 | memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata)); |
| 366 | kfree(drv); |
| 367 | platform_set_drvdata(pdev, NULL); |
| 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 | |
Stepan Moskovchenko | 516cbc7 | 2010-11-12 19:29:53 -0800 | [diff] [blame] | 388 | static int __init msm_iommu_driver_init(void) |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 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 | pr_err("Failed to register IOMMU context driver\n"); |
| 400 | goto error; |
| 401 | } |
| 402 | |
| 403 | error: |
| 404 | return ret; |
| 405 | } |
| 406 | |
Stepan Moskovchenko | 516cbc7 | 2010-11-12 19:29:53 -0800 | [diff] [blame] | 407 | static void __exit msm_iommu_driver_exit(void) |
Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame] | 408 | { |
| 409 | platform_driver_unregister(&msm_iommu_ctx_driver); |
| 410 | platform_driver_unregister(&msm_iommu_driver); |
| 411 | } |
| 412 | |
| 413 | subsys_initcall(msm_iommu_driver_init); |
| 414 | module_exit(msm_iommu_driver_exit); |
| 415 | |
| 416 | MODULE_LICENSE("GPL v2"); |
| 417 | MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); |