drivers/iommu/msm_iommu_dev.c - kernel/quantenna - Git at Google

 /* Copyright (c) 2010-2011, 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  */

 #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 "msm_iommu_hw-8xxx.h"
 #include "msm_iommu.h"

 struct iommu_ctx_iter_data {
 	/* input */
 	const char *name;

 	/* output */
 	struct device *dev;
 };

 static 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_dev *c = dev->platform_data;

 	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) {
 		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_CTX_TLBIALL(base, ctx, 0);
 		SET_TLBFLPTER(base, ctx, 0);
 		SET_TLBSLPTER(base, ctx, 0);
 		SET_TLBLKCR(base, ctx, 0);
 		SET_PRRR(base, ctx, 0);
 		SET_NMRR(base, ctx, 0);
 		SET_CONTEXTIDR(base, ctx, 0);
 	}
 }

 static int msm_iommu_probe(struct platform_device *pdev)
 {
 	struct resource *r;
 	struct clk *iommu_clk;
 	struct clk *iommu_pclk;
 	struct msm_iommu_drvdata *drvdata;
 	struct msm_iommu_dev *iommu_dev = dev_get_platdata(&pdev->dev);
 	void __iomem *regs_base;
 	int ret, irq, 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(NULL, "smmu_pclk");
 	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, "iommu_clk");

 	if (!IS_ERR(iommu_clk))	{
 		if (clk_get_rate(iommu_clk) == 0)
 			clk_set_rate(iommu_clk, 1);

 		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");
 	regs_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(regs_base)) {
 		ret = PTR_ERR(regs_base);
 		goto fail_clk;
 	}

 	irq = platform_get_irq_byname(pdev, "secure_irq");
 	if (irq < 0) {
 		ret = -ENODEV;
 		goto fail_clk;
 	}

 	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);
 	par = GET_PAR(regs_base, 0);
 	SET_V2PCFG(regs_base, 0, 0);
 	SET_M(regs_base, 0, 0);

 	if (!par) {
 		pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
 		ret = -ENODEV;
 		goto fail_clk;
 	}

 	ret = request_irq(irq, msm_iommu_fault_handler, 0,
 			"msm_iommu_secure_irpt_handler", drvdata);
 	if (ret) {
 		pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
 		goto fail_clk;
 	}


 	drvdata->pclk = iommu_pclk;
 	drvdata->clk = iommu_clk;
 	drvdata->base = regs_base;
 	drvdata->irq = irq;
 	drvdata->ncb = iommu_dev->ncb;

 	pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
 		iommu_dev->name, regs_base, irq, iommu_dev->ncb);

 	platform_set_drvdata(pdev, drvdata);

 	clk_disable(iommu_clk);

 	clk_disable(iommu_pclk);

 	return 0;
 fail_clk:
 	if (iommu_clk) {
 		clk_disable(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_unprepare(drv->clk);
 			clk_put(drv->clk);
 		}
 		clk_unprepare(drv->pclk);
 		clk_put(drv->pclk);
 		memset(drv, 0, sizeof(*drv));
 		kfree(drv);
 	}
 	return 0;
 }

 static int msm_iommu_ctx_probe(struct platform_device *pdev)
 {
 	struct msm_iommu_ctx_dev *c = dev_get_platdata(&pdev->dev);
 	struct msm_iommu_drvdata *drvdata;
 	struct msm_iommu_ctx_drvdata *ctx_drvdata;
 	int i, ret;

 	if (!c || !pdev->dev.parent)
 		return -EINVAL;

 	drvdata = dev_get_drvdata(pdev->dev.parent);
 	if (!drvdata)
 		return -ENODEV;

 	ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
 	if (!ctx_drvdata)
 		return -ENOMEM;

 	ctx_drvdata->num = c->num;
 	ctx_drvdata->pdev = pdev;

 	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);

 		/* 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 */
 		SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);

 		/* Set security bit override to be Non-secure */
 		SET_NSCFG(drvdata->base, mid, 3);
 	}

 	clk_disable(drvdata->clk);
 	clk_disable(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);
 	}
 	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 struct platform_driver * const drivers[] = {
 	&msm_iommu_driver,
 	&msm_iommu_ctx_driver,
 };

 static int __init msm_iommu_driver_init(void)
 {
 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 }

 static void __exit msm_iommu_driver_exit(void)
 {
 	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 }

 subsys_initcall(msm_iommu_driver_init);
 module_exit(msm_iommu_driver_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");
	/* Copyright (c) 2010-2011, 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/

	#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 "msm_iommu_hw-8xxx.h"
	#include "msm_iommu.h"

	struct iommu_ctx_iter_data {
	/* input */
	const char *name;

	/* output */
	struct device *dev;
	};

	static 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_dev *c = dev->platform_data;

	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) {
	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_CTX_TLBIALL(base, ctx, 0);
	SET_TLBFLPTER(base, ctx, 0);
	SET_TLBSLPTER(base, ctx, 0);
	SET_TLBLKCR(base, ctx, 0);
	SET_PRRR(base, ctx, 0);
	SET_NMRR(base, ctx, 0);
	SET_CONTEXTIDR(base, ctx, 0);
	}
	}

	static int msm_iommu_probe(struct platform_device *pdev)
	{
	struct resource *r;
	struct clk *iommu_clk;
	struct clk *iommu_pclk;
	struct msm_iommu_drvdata *drvdata;
	struct msm_iommu_dev *iommu_dev = dev_get_platdata(&pdev->dev);
	void __iomem *regs_base;
	int ret, irq, 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(NULL, "smmu_pclk");
	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, "iommu_clk");

	if (!IS_ERR(iommu_clk)) {
	if (clk_get_rate(iommu_clk) == 0)
	clk_set_rate(iommu_clk, 1);

	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");
	regs_base = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(regs_base)) {
	ret = PTR_ERR(regs_base);
	goto fail_clk;
	}

	irq = platform_get_irq_byname(pdev, "secure_irq");
	if (irq < 0) {
	ret = -ENODEV;
	goto fail_clk;
	}

	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);
	par = GET_PAR(regs_base, 0);
	SET_V2PCFG(regs_base, 0, 0);
	SET_M(regs_base, 0, 0);

	if (!par) {
	pr_err("%s: Invalid PAR value detected\n", iommu_dev->name);
	ret = -ENODEV;
	goto fail_clk;
	}

	ret = request_irq(irq, msm_iommu_fault_handler, 0,
	"msm_iommu_secure_irpt_handler", drvdata);
	if (ret) {
	pr_err("Request IRQ %d failed with ret=%d\n", irq, ret);
	goto fail_clk;
	}


	drvdata->pclk = iommu_pclk;
	drvdata->clk = iommu_clk;
	drvdata->base = regs_base;
	drvdata->irq = irq;
	drvdata->ncb = iommu_dev->ncb;

	pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",
	iommu_dev->name, regs_base, irq, iommu_dev->ncb);

	platform_set_drvdata(pdev, drvdata);

	clk_disable(iommu_clk);

	clk_disable(iommu_pclk);

	return 0;
	fail_clk:
	if (iommu_clk) {
	clk_disable(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_unprepare(drv->clk);
	clk_put(drv->clk);
	}
	clk_unprepare(drv->pclk);
	clk_put(drv->pclk);
	memset(drv, 0, sizeof(*drv));
	kfree(drv);
	}
	return 0;
	}

	static int msm_iommu_ctx_probe(struct platform_device *pdev)
	{
	struct msm_iommu_ctx_dev *c = dev_get_platdata(&pdev->dev);
	struct msm_iommu_drvdata *drvdata;
	struct msm_iommu_ctx_drvdata *ctx_drvdata;
	int i, ret;

	if (!c \|\| !pdev->dev.parent)
	return -EINVAL;

	drvdata = dev_get_drvdata(pdev->dev.parent);
	if (!drvdata)
	return -ENODEV;

	ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
	if (!ctx_drvdata)
	return -ENOMEM;

	ctx_drvdata->num = c->num;
	ctx_drvdata->pdev = pdev;

	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);

	/* 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 */
	SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num);

	/* Set security bit override to be Non-secure */
	SET_NSCFG(drvdata->base, mid, 3);
	}

	clk_disable(drvdata->clk);
	clk_disable(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);
	}
	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 struct platform_driver * const drivers[] = {
	&msm_iommu_driver,
	&msm_iommu_ctx_driver,
	};

	static int __init msm_iommu_driver_init(void)
	{
	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
	}

	static void __exit msm_iommu_driver_exit(void)
	{
	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
	}

	subsys_initcall(msm_iommu_driver_init);
	module_exit(msm_iommu_driver_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");