| /* Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/clk.h> |
| #include <linux/iommu.h> |
| #include <linux/interrupt.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| |
| #include <mach/iommu_hw-8xxx.h> |
| #include <mach/iommu.h> |
| |
| struct iommu_ctx_iter_data { |
| /* input */ |
| const char *name; |
| |
| /* output */ |
| struct device *dev; |
| }; |
| |
| struct platform_device *msm_iommu_root_dev; |
| |
| static int each_iommu_ctx(struct device *dev, void *data) |
| { |
| struct iommu_ctx_iter_data *res = data; |
| struct msm_iommu_ctx_drvdata *c; |
| |
| c = dev_get_drvdata(dev); |
| if (!res || !c || !c->name || !res->name) |
| return -EINVAL; |
| |
| if (!strcmp(res->name, c->name)) { |
| res->dev = dev; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int each_iommu(struct device *dev, void *data) |
| { |
| return device_for_each_child(dev, data, each_iommu_ctx); |
| } |
| |
| struct device *msm_iommu_get_ctx(const char *ctx_name) |
| { |
| struct iommu_ctx_iter_data r; |
| int found; |
| |
| if (!msm_iommu_root_dev) { |
| pr_err("No root IOMMU device.\n"); |
| goto fail; |
| } |
| |
| r.name = ctx_name; |
| found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu); |
| |
| if (found <= 0 || !dev_get_drvdata(r.dev)) { |
| pr_err("Could not find context <%s>\n", ctx_name); |
| goto fail; |
| } |
| |
| return r.dev; |
| fail: |
| return NULL; |
| } |
| EXPORT_SYMBOL(msm_iommu_get_ctx); |
| |
| static void msm_iommu_reset(void __iomem *base, int ncb) |
| { |
| int ctx; |
| |
| SET_RPUE(base, 0); |
| SET_RPUEIE(base, 0); |
| SET_ESRRESTORE(base, 0); |
| SET_TBE(base, 0); |
| SET_CR(base, 0); |
| SET_SPDMBE(base, 0); |
| SET_TESTBUSCR(base, 0); |
| SET_TLBRSW(base, 0); |
| SET_GLOBAL_TLBIALL(base, 0); |
| SET_RPU_ACR(base, 0); |
| SET_TLBLKCRWE(base, 1); |
| |
| for (ctx = 0; ctx < ncb; ctx++) { |
| SET_BPRCOSH(base, ctx, 0); |
| SET_BPRCISH(base, ctx, 0); |
| SET_BPRCNSH(base, ctx, 0); |
| SET_BPSHCFG(base, ctx, 0); |
| SET_BPMTCFG(base, ctx, 0); |
| SET_ACTLR(base, ctx, 0); |
| SET_SCTLR(base, ctx, 0); |
| SET_FSRRESTORE(base, ctx, 0); |
| SET_TTBR0(base, ctx, 0); |
| SET_TTBR1(base, ctx, 0); |
| SET_TTBCR(base, ctx, 0); |
| SET_BFBCR(base, ctx, 0); |
| SET_PAR(base, ctx, 0); |
| SET_FAR(base, ctx, 0); |
| SET_TLBFLPTER(base, ctx, 0); |
| SET_TLBSLPTER(base, ctx, 0); |
| SET_TLBLKCR(base, ctx, 0); |
| SET_CTX_TLBIALL(base, ctx, 0); |
| SET_TLBIVA(base, ctx, 0); |
| SET_PRRR(base, ctx, 0); |
| SET_NMRR(base, ctx, 0); |
| SET_CONTEXTIDR(base, ctx, 0); |
| } |
| mb(); |
| } |
| |
| static int msm_iommu_probe(struct platform_device *pdev) |
| { |
| struct resource *r, *r2; |
| struct clk *iommu_clk = NULL; |
| struct clk *iommu_pclk = NULL; |
| struct msm_iommu_drvdata *drvdata; |
| struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data; |
| void __iomem *regs_base; |
| resource_size_t len; |
| int ret, par; |
| |
| if (pdev->id == -1) { |
| msm_iommu_root_dev = pdev; |
| return 0; |
| } |
| |
| drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); |
| |
| if (!drvdata) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| |
| if (!iommu_dev) { |
| ret = -ENODEV; |
| goto fail; |
| } |
| |
| iommu_pclk = clk_get_sys("msm_iommu", "iface_clk"); |
| if (IS_ERR(iommu_pclk)) { |
| ret = -ENODEV; |
| goto fail; |
| } |
| |
| ret = clk_prepare_enable(iommu_pclk); |
| if (ret) |
| goto fail_enable; |
| |
| iommu_clk = clk_get(&pdev->dev, "core_clk"); |
| |
| if (!IS_ERR(iommu_clk)) { |
| if (clk_get_rate(iommu_clk) == 0) { |
| ret = clk_round_rate(iommu_clk, 1); |
| clk_set_rate(iommu_clk, ret); |
| } |
| |
| ret = clk_prepare_enable(iommu_clk); |
| if (ret) { |
| clk_put(iommu_clk); |
| goto fail_pclk; |
| } |
| } else |
| iommu_clk = NULL; |
| |
| r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase"); |
| |
| if (!r) { |
| ret = -ENODEV; |
| goto fail_clk; |
| } |
| |
| len = resource_size(r); |
| |
| r2 = request_mem_region(r->start, len, r->name); |
| if (!r2) { |
| pr_err("Could not request memory region: start=%p, len=%d\n", |
| (void *) r->start, len); |
| ret = -EBUSY; |
| goto fail_clk; |
| } |
| |
| regs_base = ioremap(r2->start, len); |
| |
| if (!regs_base) { |
| pr_err("Could not ioremap: start=%p, len=%d\n", |
| (void *) r2->start, len); |
| ret = -EBUSY; |
| goto fail_mem; |
| } |
| |
| msm_iommu_reset(regs_base, iommu_dev->ncb); |
| |
| SET_M(regs_base, 0, 1); |
| SET_PAR(regs_base, 0, 0); |
| SET_V2PCFG(regs_base, 0, 1); |
| SET_V2PPR(regs_base, 0, 0); |
| mb(); |
| par = GET_PAR(regs_base, 0); |
| SET_V2PCFG(regs_base, 0, 0); |
| SET_M(regs_base, 0, 0); |
| mb(); |
| |
| if (!par) { |
| pr_err("%s: Invalid PAR value detected\n", iommu_dev->name); |
| ret = -ENODEV; |
| goto fail_io; |
| } |
| |
| drvdata->pclk = iommu_pclk; |
| drvdata->clk = iommu_clk; |
| drvdata->base = regs_base; |
| drvdata->ncb = iommu_dev->ncb; |
| drvdata->ttbr_split = iommu_dev->ttbr_split; |
| drvdata->name = iommu_dev->name; |
| |
| pr_info("device %s mapped at %p, with %d ctx banks\n", |
| iommu_dev->name, regs_base, iommu_dev->ncb); |
| |
| platform_set_drvdata(pdev, drvdata); |
| |
| if (iommu_clk) |
| clk_disable_unprepare(iommu_clk); |
| |
| clk_disable_unprepare(iommu_pclk); |
| |
| return 0; |
| fail_io: |
| iounmap(regs_base); |
| fail_mem: |
| release_mem_region(r->start, len); |
| fail_clk: |
| if (iommu_clk) { |
| clk_disable_unprepare(iommu_clk); |
| clk_put(iommu_clk); |
| } |
| fail_pclk: |
| clk_disable_unprepare(iommu_pclk); |
| fail_enable: |
| clk_put(iommu_pclk); |
| fail: |
| kfree(drvdata); |
| return ret; |
| } |
| |
| static int msm_iommu_remove(struct platform_device *pdev) |
| { |
| struct msm_iommu_drvdata *drv = NULL; |
| |
| drv = platform_get_drvdata(pdev); |
| if (drv) { |
| if (drv->clk) |
| clk_put(drv->clk); |
| clk_put(drv->pclk); |
| memset(drv, 0, sizeof(*drv)); |
| kfree(drv); |
| platform_set_drvdata(pdev, NULL); |
| } |
| return 0; |
| } |
| |
| static int msm_iommu_ctx_probe(struct platform_device *pdev) |
| { |
| struct msm_iommu_ctx_dev *c = pdev->dev.platform_data; |
| struct msm_iommu_drvdata *drvdata; |
| struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL; |
| int i, ret, irq; |
| if (!c || !pdev->dev.parent) { |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| drvdata = dev_get_drvdata(pdev->dev.parent); |
| |
| if (!drvdata) { |
| ret = -ENODEV; |
| goto fail; |
| } |
| |
| ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL); |
| if (!ctx_drvdata) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| ctx_drvdata->num = c->num; |
| ctx_drvdata->pdev = pdev; |
| ctx_drvdata->name = c->name; |
| |
| irq = platform_get_irq_byname(to_platform_device(pdev->dev.parent), |
| "nonsecure_irq"); |
| if (irq < 0) { |
| ret = -ENODEV; |
| goto fail; |
| } |
| |
| ret = request_threaded_irq(irq, NULL, msm_iommu_fault_handler, |
| IRQF_ONESHOT | IRQF_SHARED, |
| "msm_iommu_nonsecure_irq", ctx_drvdata); |
| |
| if (ret) { |
| pr_err("request_threaded_irq %d failed: %d\n", irq, ret); |
| goto fail; |
| } |
| |
| INIT_LIST_HEAD(&ctx_drvdata->attached_elm); |
| platform_set_drvdata(pdev, ctx_drvdata); |
| |
| ret = clk_prepare_enable(drvdata->pclk); |
| if (ret) |
| goto fail; |
| |
| if (drvdata->clk) { |
| ret = clk_prepare_enable(drvdata->clk); |
| if (ret) { |
| clk_disable_unprepare(drvdata->pclk); |
| goto fail; |
| } |
| } |
| |
| /* Program the M2V tables for this context */ |
| for (i = 0; i < MAX_NUM_MIDS; i++) { |
| int mid = c->mids[i]; |
| if (mid == -1) |
| break; |
| |
| SET_M2VCBR_N(drvdata->base, mid, 0); |
| SET_CBACR_N(drvdata->base, c->num, 0); |
| |
| /* Route page faults to the non-secure interrupt */ |
| SET_IRPTNDX(drvdata->base, c->num, 1); |
| |
| /* Set VMID = 0 */ |
| SET_VMID(drvdata->base, mid, 0); |
| |
| /* Set the context number for that MID to this context */ |
| SET_CBNDX(drvdata->base, mid, c->num); |
| |
| /* Set MID associated with this context bank to 0 */ |
| SET_CBVMID(drvdata->base, c->num, 0); |
| |
| /* Set the ASID for TLB tagging for this context to 0 */ |
| SET_CONTEXTIDR_ASID(drvdata->base, c->num, 0); |
| |
| /* Set security bit override to be Non-secure */ |
| SET_NSCFG(drvdata->base, mid, 3); |
| } |
| mb(); |
| |
| if (drvdata->clk) |
| clk_disable_unprepare(drvdata->clk); |
| clk_disable_unprepare(drvdata->pclk); |
| |
| dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num); |
| return 0; |
| fail: |
| kfree(ctx_drvdata); |
| return ret; |
| } |
| |
| static int msm_iommu_ctx_remove(struct platform_device *pdev) |
| { |
| struct msm_iommu_ctx_drvdata *drv = NULL; |
| drv = platform_get_drvdata(pdev); |
| if (drv) { |
| memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata)); |
| kfree(drv); |
| platform_set_drvdata(pdev, NULL); |
| } |
| return 0; |
| } |
| |
| static struct platform_driver msm_iommu_driver = { |
| .driver = { |
| .name = "msm_iommu", |
| }, |
| .probe = msm_iommu_probe, |
| .remove = msm_iommu_remove, |
| }; |
| |
| static struct platform_driver msm_iommu_ctx_driver = { |
| .driver = { |
| .name = "msm_iommu_ctx", |
| }, |
| .probe = msm_iommu_ctx_probe, |
| .remove = msm_iommu_ctx_remove, |
| }; |
| |
| static int __init msm_iommu_driver_init(void) |
| { |
| int ret; |
| ret = platform_driver_register(&msm_iommu_driver); |
| if (ret != 0) { |
| pr_err("Failed to register IOMMU driver\n"); |
| goto error; |
| } |
| |
| ret = platform_driver_register(&msm_iommu_ctx_driver); |
| if (ret != 0) { |
| pr_err("Failed to register IOMMU context driver\n"); |
| goto error; |
| } |
| |
| error: |
| return ret; |
| } |
| |
| static void __exit msm_iommu_driver_exit(void) |
| { |
| platform_driver_unregister(&msm_iommu_ctx_driver); |
| platform_driver_unregister(&msm_iommu_driver); |
| } |
| |
| subsys_initcall(msm_iommu_driver_init); |
| module_exit(msm_iommu_driver_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); |