Stepan Moskovchenko | c6a5951 | 2010-08-24 18:32:38 -0700 | [diff] [blame^] | 1 | /* Copyright (c) 2010, 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 <mach/iommu_hw-8xxx.h> |
| 31 | #include <mach/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) |
| 88 | { |
| 89 | int ctx, ncb; |
| 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 | ncb = GET_NCB(base)+1; |
| 103 | |
| 104 | for (ctx = 0; ctx < ncb; ctx++) { |
| 105 | SET_BPRCOSH(base, ctx, 0); |
| 106 | SET_BPRCISH(base, ctx, 0); |
| 107 | SET_BPRCNSH(base, ctx, 0); |
| 108 | SET_BPSHCFG(base, ctx, 0); |
| 109 | SET_BPMTCFG(base, ctx, 0); |
| 110 | SET_ACTLR(base, ctx, 0); |
| 111 | SET_SCTLR(base, ctx, 0); |
| 112 | SET_FSRRESTORE(base, ctx, 0); |
| 113 | SET_TTBR0(base, ctx, 0); |
| 114 | SET_TTBR1(base, ctx, 0); |
| 115 | SET_TTBCR(base, ctx, 0); |
| 116 | SET_BFBCR(base, ctx, 0); |
| 117 | SET_PAR(base, ctx, 0); |
| 118 | SET_FAR(base, ctx, 0); |
| 119 | SET_CTX_TLBIALL(base, ctx, 0); |
| 120 | SET_TLBFLPTER(base, ctx, 0); |
| 121 | SET_TLBSLPTER(base, ctx, 0); |
| 122 | SET_TLBLKCR(base, ctx, 0); |
| 123 | SET_PRRR(base, ctx, 0); |
| 124 | SET_NMRR(base, ctx, 0); |
| 125 | SET_CONTEXTIDR(base, ctx, 0); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static int msm_iommu_probe(struct platform_device *pdev) |
| 130 | { |
| 131 | struct resource *r; |
| 132 | struct clk *iommu_clk; |
| 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 = 0, ncb, nm2v, irq; |
| 138 | |
| 139 | if (pdev->id != -1) { |
| 140 | drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); |
| 141 | |
| 142 | if (!drvdata) { |
| 143 | ret = -ENOMEM; |
| 144 | goto fail; |
| 145 | } |
| 146 | |
| 147 | if (!iommu_dev) { |
| 148 | ret = -ENODEV; |
| 149 | goto fail; |
| 150 | } |
| 151 | |
| 152 | if (iommu_dev->clk_rate != 0) { |
| 153 | iommu_clk = clk_get(&pdev->dev, "iommu_clk"); |
| 154 | |
| 155 | if (IS_ERR(iommu_clk)) { |
| 156 | ret = -ENODEV; |
| 157 | goto fail; |
| 158 | } |
| 159 | |
| 160 | if (iommu_dev->clk_rate > 0) { |
| 161 | ret = clk_set_rate(iommu_clk, |
| 162 | iommu_dev->clk_rate); |
| 163 | if (ret) { |
| 164 | clk_put(iommu_clk); |
| 165 | goto fail; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | ret = clk_enable(iommu_clk); |
| 170 | if (ret) { |
| 171 | clk_put(iommu_clk); |
| 172 | goto fail; |
| 173 | } |
| 174 | clk_put(iommu_clk); |
| 175 | } |
| 176 | |
| 177 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
| 178 | "physbase"); |
| 179 | if (!r) { |
| 180 | ret = -ENODEV; |
| 181 | goto fail; |
| 182 | } |
| 183 | |
| 184 | len = r->end - r->start + 1; |
| 185 | |
| 186 | r = request_mem_region(r->start, len, r->name); |
| 187 | if (!r) { |
| 188 | pr_err("Could not request memory region: " |
| 189 | "start=%p, len=%d\n", (void *) r->start, len); |
| 190 | ret = -EBUSY; |
| 191 | goto fail; |
| 192 | } |
| 193 | |
| 194 | regs_base = ioremap(r->start, len); |
| 195 | |
| 196 | if (!regs_base) { |
| 197 | pr_err("Could not ioremap: start=%p, len=%d\n", |
| 198 | (void *) r->start, len); |
| 199 | ret = -EBUSY; |
| 200 | goto fail; |
| 201 | } |
| 202 | |
| 203 | irq = platform_get_irq_byname(pdev, "secure_irq"); |
| 204 | if (irq < 0) { |
| 205 | ret = -ENODEV; |
| 206 | goto fail; |
| 207 | } |
| 208 | |
| 209 | mb(); |
| 210 | |
| 211 | if (GET_IDR(regs_base) == 0) { |
| 212 | pr_err("Invalid IDR value detected\n"); |
| 213 | ret = -ENODEV; |
| 214 | goto fail; |
| 215 | } |
| 216 | |
| 217 | ret = request_irq(irq, msm_iommu_fault_handler, 0, |
| 218 | "msm_iommu_secure_irpt_handler", drvdata); |
| 219 | if (ret) { |
| 220 | pr_err("Request IRQ %d failed with ret=%d\n", irq, ret); |
| 221 | goto fail; |
| 222 | } |
| 223 | |
| 224 | msm_iommu_reset(regs_base); |
| 225 | drvdata->base = regs_base; |
| 226 | drvdata->irq = irq; |
| 227 | |
| 228 | nm2v = GET_NM2VCBMT((unsigned long) regs_base); |
| 229 | ncb = GET_NCB((unsigned long) regs_base); |
| 230 | |
| 231 | pr_info("device %s mapped at %p, irq %d with %d ctx banks\n", |
| 232 | iommu_dev->name, regs_base, irq, ncb+1); |
| 233 | |
| 234 | platform_set_drvdata(pdev, drvdata); |
| 235 | } else |
| 236 | msm_iommu_root_dev = pdev; |
| 237 | |
| 238 | return 0; |
| 239 | |
| 240 | fail: |
| 241 | kfree(drvdata); |
| 242 | return ret; |
| 243 | } |
| 244 | |
| 245 | static int msm_iommu_remove(struct platform_device *pdev) |
| 246 | { |
| 247 | struct msm_iommu_drvdata *drv = NULL; |
| 248 | |
| 249 | drv = platform_get_drvdata(pdev); |
| 250 | if (drv) { |
| 251 | memset(drv, 0, sizeof(struct msm_iommu_drvdata)); |
| 252 | kfree(drv); |
| 253 | platform_set_drvdata(pdev, NULL); |
| 254 | } |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | static int msm_iommu_ctx_probe(struct platform_device *pdev) |
| 259 | { |
| 260 | struct msm_iommu_ctx_dev *c = pdev->dev.platform_data; |
| 261 | struct msm_iommu_drvdata *drvdata; |
| 262 | struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL; |
| 263 | int i, ret = 0; |
| 264 | if (!c || !pdev->dev.parent) { |
| 265 | ret = -EINVAL; |
| 266 | goto fail; |
| 267 | } |
| 268 | |
| 269 | drvdata = dev_get_drvdata(pdev->dev.parent); |
| 270 | |
| 271 | if (!drvdata) { |
| 272 | ret = -ENODEV; |
| 273 | goto fail; |
| 274 | } |
| 275 | |
| 276 | ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL); |
| 277 | if (!ctx_drvdata) { |
| 278 | ret = -ENOMEM; |
| 279 | goto fail; |
| 280 | } |
| 281 | ctx_drvdata->num = c->num; |
| 282 | ctx_drvdata->pdev = pdev; |
| 283 | |
| 284 | INIT_LIST_HEAD(&ctx_drvdata->attached_elm); |
| 285 | platform_set_drvdata(pdev, ctx_drvdata); |
| 286 | |
| 287 | /* Program the M2V tables for this context */ |
| 288 | for (i = 0; i < MAX_NUM_MIDS; i++) { |
| 289 | int mid = c->mids[i]; |
| 290 | if (mid == -1) |
| 291 | break; |
| 292 | |
| 293 | SET_M2VCBR_N(drvdata->base, mid, 0); |
| 294 | SET_CBACR_N(drvdata->base, c->num, 0); |
| 295 | |
| 296 | /* Set VMID = MID */ |
| 297 | SET_VMID(drvdata->base, mid, mid); |
| 298 | |
| 299 | /* Set the context number for that MID to this context */ |
| 300 | SET_CBNDX(drvdata->base, mid, c->num); |
| 301 | |
| 302 | /* Set MID associated with this context bank */ |
| 303 | SET_CBVMID(drvdata->base, c->num, mid); |
| 304 | |
| 305 | /* Set security bit override to be Non-secure */ |
| 306 | SET_NSCFG(drvdata->base, mid, 3); |
| 307 | } |
| 308 | |
| 309 | pr_info("context device %s with bank index %d\n", c->name, c->num); |
| 310 | |
| 311 | return 0; |
| 312 | fail: |
| 313 | kfree(ctx_drvdata); |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | static int msm_iommu_ctx_remove(struct platform_device *pdev) |
| 318 | { |
| 319 | struct msm_iommu_ctx_drvdata *drv = NULL; |
| 320 | drv = platform_get_drvdata(pdev); |
| 321 | if (drv) { |
| 322 | memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata)); |
| 323 | kfree(drv); |
| 324 | platform_set_drvdata(pdev, NULL); |
| 325 | } |
| 326 | return 0; |
| 327 | } |
| 328 | |
| 329 | static struct platform_driver msm_iommu_driver = { |
| 330 | .driver = { |
| 331 | .name = "msm_iommu", |
| 332 | }, |
| 333 | .probe = msm_iommu_probe, |
| 334 | .remove = msm_iommu_remove, |
| 335 | }; |
| 336 | |
| 337 | static struct platform_driver msm_iommu_ctx_driver = { |
| 338 | .driver = { |
| 339 | .name = "msm_iommu_ctx", |
| 340 | }, |
| 341 | .probe = msm_iommu_ctx_probe, |
| 342 | .remove = msm_iommu_ctx_remove, |
| 343 | }; |
| 344 | |
| 345 | static int msm_iommu_driver_init(void) |
| 346 | { |
| 347 | int ret; |
| 348 | ret = platform_driver_register(&msm_iommu_driver); |
| 349 | if (ret != 0) { |
| 350 | pr_err("Failed to register IOMMU driver\n"); |
| 351 | goto error; |
| 352 | } |
| 353 | |
| 354 | ret = platform_driver_register(&msm_iommu_ctx_driver); |
| 355 | if (ret != 0) { |
| 356 | pr_err("Failed to register IOMMU context driver\n"); |
| 357 | goto error; |
| 358 | } |
| 359 | |
| 360 | error: |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | static void msm_iommu_driver_exit(void) |
| 365 | { |
| 366 | platform_driver_unregister(&msm_iommu_ctx_driver); |
| 367 | platform_driver_unregister(&msm_iommu_driver); |
| 368 | } |
| 369 | |
| 370 | subsys_initcall(msm_iommu_driver_init); |
| 371 | module_exit(msm_iommu_driver_exit); |
| 372 | |
| 373 | MODULE_LICENSE("GPL v2"); |
| 374 | MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); |