1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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.
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.
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
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.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>
30 #include <mach/iommu_hw-8xxx.h>
31 #include <mach/iommu.h>
33 struct iommu_ctx_iter_data {
41 static struct platform_device *msm_iommu_root_dev;
43 static int each_iommu_ctx(struct device *dev, void *data)
45 struct iommu_ctx_iter_data *res = data;
46 struct msm_iommu_ctx_dev *c = dev->platform_data;
48 if (!res || !c || !c->name || !res->name)
51 if (!strcmp(res->name, c->name)) {
58 static int each_iommu(struct device *dev, void *data)
60 return device_for_each_child(dev, data, each_iommu_ctx);
63 struct device *msm_iommu_get_ctx(const char *ctx_name)
65 struct iommu_ctx_iter_data r;
68 if (!msm_iommu_root_dev) {
69 pr_err("No root IOMMU device.\n");
74 found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu);
77 pr_err("Could not find context <%s>\n", ctx_name);
85 EXPORT_SYMBOL(msm_iommu_get_ctx);
87 static void msm_iommu_reset(void __iomem *base)
93 SET_ESRRESTORE(base, 0);
97 SET_TESTBUSCR(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;
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);
129 static int msm_iommu_probe(struct platform_device *pdev)
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;
137 int ret = 0, ncb, nm2v, irq;
139 if (pdev->id != -1) {
140 drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
152 if (iommu_dev->clk_rate != 0) {
153 iommu_clk = clk_get(&pdev->dev, "iommu_clk");
155 if (IS_ERR(iommu_clk)) {
160 if (iommu_dev->clk_rate > 0) {
161 ret = clk_set_rate(iommu_clk,
162 iommu_dev->clk_rate);
169 ret = clk_enable(iommu_clk);
177 r = platform_get_resource_byname(pdev, IORESOURCE_MEM,
184 len = r->end - r->start + 1;
186 r = request_mem_region(r->start, len, r->name);
188 pr_err("Could not request memory region: "
189 "start=%p, len=%d\n", (void *) r->start, len);
194 regs_base = ioremap(r->start, len);
197 pr_err("Could not ioremap: start=%p, len=%d\n",
198 (void *) r->start, len);
203 irq = platform_get_irq_byname(pdev, "secure_irq");
211 if (GET_IDR(regs_base) == 0) {
212 pr_err("Invalid IDR value detected\n");
217 ret = request_irq(irq, msm_iommu_fault_handler, 0,
218 "msm_iommu_secure_irpt_handler", drvdata);
220 pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
224 msm_iommu_reset(regs_base);
225 drvdata->base = regs_base;
228 nm2v = GET_NM2VCBMT((unsigned long) regs_base);
229 ncb = GET_NCB((unsigned long) regs_base);
231 pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
232 iommu_dev->name, regs_base, irq, ncb+1);
234 platform_set_drvdata(pdev, drvdata);
236 msm_iommu_root_dev = pdev;
245 static int msm_iommu_remove(struct platform_device *pdev)
247 struct msm_iommu_drvdata *drv = NULL;
249 drv = platform_get_drvdata(pdev);
251 memset(drv, 0, sizeof(struct msm_iommu_drvdata));
253 platform_set_drvdata(pdev, NULL);
258 static int msm_iommu_ctx_probe(struct platform_device *pdev)
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;
264 if (!c || !pdev->dev.parent) {
269 drvdata = dev_get_drvdata(pdev->dev.parent);
276 ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
281 ctx_drvdata->num = c->num;
282 ctx_drvdata->pdev = pdev;
284 INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
285 platform_set_drvdata(pdev, ctx_drvdata);
287 /* Program the M2V tables for this context */
288 for (i = 0; i < MAX_NUM_MIDS; i++) {
289 int mid = c->mids[i];
293 SET_M2VCBR_N(drvdata->base, mid, 0);
294 SET_CBACR_N(drvdata->base, c->num, 0);
297 SET_VMID(drvdata->base, mid, mid);
299 /* Set the context number for that MID to this context */
300 SET_CBNDX(drvdata->base, mid, c->num);
302 /* Set MID associated with this context bank */
303 SET_CBVMID(drvdata->base, c->num, mid);
305 /* Set security bit override to be Non-secure */
306 SET_NSCFG(drvdata->base, mid, 3);
309 pr_info("context device %s with bank index %d\n", c->name, c->num);
317 static int msm_iommu_ctx_remove(struct platform_device *pdev)
319 struct msm_iommu_ctx_drvdata *drv = NULL;
320 drv = platform_get_drvdata(pdev);
322 memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
324 platform_set_drvdata(pdev, NULL);
329 static struct platform_driver msm_iommu_driver = {
333 .probe = msm_iommu_probe,
334 .remove = msm_iommu_remove,
337 static struct platform_driver msm_iommu_ctx_driver = {
339 .name = "msm_iommu_ctx",
341 .probe = msm_iommu_ctx_probe,
342 .remove = msm_iommu_ctx_remove,
345 static int msm_iommu_driver_init(void)
348 ret = platform_driver_register(&msm_iommu_driver);
350 pr_err("Failed to register IOMMU driver\n");
354 ret = platform_driver_register(&msm_iommu_ctx_driver);
356 pr_err("Failed to register IOMMU context driver\n");
364 static void msm_iommu_driver_exit(void)
366 platform_driver_unregister(&msm_iommu_ctx_driver);
367 platform_driver_unregister(&msm_iommu_driver);
370 subsys_initcall(msm_iommu_driver_init);
371 module_exit(msm_iommu_driver_exit);
373 MODULE_LICENSE("GPL v2");
374 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");