msm: Platform initialization for the IOMMU driver

endif

endif

obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o

obj-$(CONFIG_ARCH_MSM8X60) += clock-dummy.o iommu.o iommu_dev.o

obj-$(CONFIG_MSM_PROC_COMM) += proc_comm.o clock-pcom.o vreg.o

obj-$(CONFIG_MSM_PROC_COMM) += clock.o

obj-$(CONFIG_ARCH_QSD8X50) += sirc.o

/* Copyright (c) 2010, 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 <mach/iommu_hw-8xxx.h>

#include <mach/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 ctx, ncb;

	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);

	ncb = GET_NCB(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 msm_iommu_drvdata *drvdata;

	struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data;

	void __iomem *regs_base;

	resource_size_t	len;

	int ret = 0, ncb, nm2v, irq;

	if (pdev->id != -1) {

		drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);

		if (!drvdata) {

			ret = -ENOMEM;

			goto fail;

		}

		if (!iommu_dev) {

			ret = -ENODEV;

			goto fail;

		}

		if (iommu_dev->clk_rate != 0) {

			iommu_clk = clk_get(&pdev->dev, "iommu_clk");

			if (IS_ERR(iommu_clk)) {

				ret = -ENODEV;

				goto fail;

			}

			if (iommu_dev->clk_rate > 0) {

				ret = clk_set_rate(iommu_clk,

							iommu_dev->clk_rate);

				if (ret) {

					clk_put(iommu_clk);

					goto fail;

				}

			}

			ret = clk_enable(iommu_clk);

			if (ret) {

				clk_put(iommu_clk);

				goto fail;

			}

			clk_put(iommu_clk);

		}

		r = platform_get_resource_byname(pdev, IORESOURCE_MEM,

						 "physbase");

		if (!r) {

			ret = -ENODEV;

			goto fail;

		}

		len = r->end - r->start + 1;

		r = request_mem_region(r->start, len, r->name);

		if (!r) {

			pr_err("Could not request memory region: "

			"start=%p, len=%d\n", (void *) r->start, len);

			ret = -EBUSY;

			goto fail;

		}

		regs_base = ioremap(r->start, len);

		if (!regs_base) {

			pr_err("Could not ioremap: start=%p, len=%d\n",

				 (void *) r->start, len);

			ret = -EBUSY;

			goto fail;

		}

		irq = platform_get_irq_byname(pdev, "secure_irq");

		if (irq < 0) {

			ret = -ENODEV;

			goto fail;

		}

		mb();

		if (GET_IDR(regs_base) == 0) {

			pr_err("Invalid IDR value detected\n");

			ret = -ENODEV;

			goto fail;

		}

		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;

		}

		msm_iommu_reset(regs_base);

		drvdata->base = regs_base;

		drvdata->irq = irq;

		nm2v = GET_NM2VCBMT((unsigned long) regs_base);

		ncb = GET_NCB((unsigned long) regs_base);

		pr_info("device %s mapped at %p, irq %d with %d ctx banks\n",

			iommu_dev->name, regs_base, irq, ncb+1);

		platform_set_drvdata(pdev, drvdata);

	} else

		msm_iommu_root_dev = pdev;

	return 0;

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) {

		memset(drv, 0, sizeof(struct msm_iommu_drvdata));

		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 = 0;

	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;

	INIT_LIST_HEAD(&ctx_drvdata->attached_elm);

	platform_set_drvdata(pdev, ctx_drvdata);

	/* 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 = MID */

		SET_VMID(drvdata->base, mid, mid);

		/* Set the context number for that MID to this context */

		SET_CBNDX(drvdata->base, mid, c->num);

		/* Set MID associated with this context bank */

		SET_CBVMID(drvdata->base, c->num, mid);

		/* Set security bit override to be Non-secure */

		SET_NSCFG(drvdata->base, mid, 3);

	}

	pr_info("context device %s with bank index %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 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 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>");