[net-next-2.6.git] / arch / arm / mach-msm / iommu_dev.c

/* 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, *r2;
	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;

		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;
		}

		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;
		}

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

		mb();

		if (GET_IDR(regs_base) == 0) {
			pr_err("Invalid IDR value detected\n");
			ret = -ENODEV;
			goto fail_io;
		}

		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_io;
		}

		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_io:
	iounmap(regs_base);
fail_mem:
	release_mem_region(r->start, len);
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>");
Commit	Line	Data
c6a5951e SM	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	{
a86c44d4	131	struct resource r, r2;
c6a5951e SM	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
a86c44d4 VK	186	r2 = request_mem_region(r->start, len, r->name);
a86c44d4 VK	187	if (!r2) {
c6a5951e SM	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
a86c44d4	194	regs_base = ioremap(r2->start, len);
c6a5951e SM	195
	196	if (!regs_base) {
	197	pr_err("Could not ioremap: start=%p, len=%d\n",
a86c44d4	198	(void *) r2->start, len);
c6a5951e	199	ret = -EBUSY;
a86c44d4	200	goto fail_mem;
c6a5951e SM	201	}
	202
	203	irq = platform_get_irq_byname(pdev, "secure_irq");
	204	if (irq < 0) {
	205	ret = -ENODEV;
a86c44d4	206	goto fail_io;
c6a5951e SM	207	}
	208
	209	mb();
	210
	211	if (GET_IDR(regs_base) == 0) {
	212	pr_err("Invalid IDR value detected\n");
	213	ret = -ENODEV;
a86c44d4	214	goto fail_io;
c6a5951e SM	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);
a86c44d4	221	goto fail_io;
c6a5951e SM	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
a86c44d4 VK	240	fail_io:
	241	iounmap(regs_base);
	242	fail_mem:
	243	release_mem_region(r->start, len);
c6a5951e SM	244	fail:
	245	kfree(drvdata);
	246	return ret;
	247	}
	248
	249	static int msm_iommu_remove(struct platform_device *pdev)
	250	{
	251	struct msm_iommu_drvdata *drv = NULL;
	252
	253	drv = platform_get_drvdata(pdev);
	254	if (drv) {
	255	memset(drv, 0, sizeof(struct msm_iommu_drvdata));
	256	kfree(drv);
	257	platform_set_drvdata(pdev, NULL);
	258	}
	259	return 0;
	260	}
	261
	262	static int msm_iommu_ctx_probe(struct platform_device *pdev)
	263	{
	264	struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
	265	struct msm_iommu_drvdata *drvdata;
	266	struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
	267	int i, ret = 0;
	268	if (!c \|\| !pdev->dev.parent) {
	269	ret = -EINVAL;
	270	goto fail;
	271	}
	272
	273	drvdata = dev_get_drvdata(pdev->dev.parent);
	274
	275	if (!drvdata) {
	276	ret = -ENODEV;
	277	goto fail;
	278	}
	279
	280	ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
	281	if (!ctx_drvdata) {
	282	ret = -ENOMEM;
	283	goto fail;
	284	}
	285	ctx_drvdata->num = c->num;
	286	ctx_drvdata->pdev = pdev;
	287
	288	INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
	289	platform_set_drvdata(pdev, ctx_drvdata);
	290
	291	/* Program the M2V tables for this context */
	292	for (i = 0; i < MAX_NUM_MIDS; i++) {
	293	int mid = c->mids[i];
	294	if (mid == -1)
	295	break;
	296
	297	SET_M2VCBR_N(drvdata->base, mid, 0);
	298	SET_CBACR_N(drvdata->base, c->num, 0);
	299
	300	/* Set VMID = MID */
	301	SET_VMID(drvdata->base, mid, mid);
	302
	303	/* Set the context number for that MID to this context */
	304	SET_CBNDX(drvdata->base, mid, c->num);
	305
	306	/* Set MID associated with this context bank */
	307	SET_CBVMID(drvdata->base, c->num, mid);
308
309	/* Set security bit override to be Non-secure */
310	SET_NSCFG(drvdata->base, mid, 3);
311	}
312
313	pr_info("context device %s with bank index %d\n", c->name, c->num);
314
315	return 0;
316	fail:
317	kfree(ctx_drvdata);
318	return ret;
319	}
320
321	static int msm_iommu_ctx_remove(struct platform_device *pdev)
322	{
323	struct msm_iommu_ctx_drvdata *drv = NULL;
324	drv = platform_get_drvdata(pdev);
325	if (drv) {
326	memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata));
327	kfree(drv);
328	platform_set_drvdata(pdev, NULL);
329	}
330	return 0;
331	}
332
333	static struct platform_driver msm_iommu_driver = {
334	.driver = {
335	.name = "msm_iommu",
336	},
337	.probe = msm_iommu_probe,
338	.remove = msm_iommu_remove,
339	};
340
341	static struct platform_driver msm_iommu_ctx_driver = {
342	.driver = {
343	.name = "msm_iommu_ctx",
344	},
345	.probe = msm_iommu_ctx_probe,
346	.remove = msm_iommu_ctx_remove,
347	};
348
349	static int msm_iommu_driver_init(void)
350	{
351	int ret;
352	ret = platform_driver_register(&msm_iommu_driver);
353	if (ret != 0) {
354	pr_err("Failed to register IOMMU driver\n");
355	goto error;
356	}
357
358	ret = platform_driver_register(&msm_iommu_ctx_driver);
359	if (ret != 0) {
360	pr_err("Failed to register IOMMU context driver\n");
361	goto error;
362	}
363
364	error:
365	return ret;
366	}
367
368	static void msm_iommu_driver_exit(void)
369	{
370	platform_driver_unregister(&msm_iommu_ctx_driver);
371	platform_driver_unregister(&msm_iommu_driver);
372	}
373
374	subsys_initcall(msm_iommu_driver_init);
375	module_exit(msm_iommu_driver_exit);
376
377	MODULE_LICENSE("GPL v2");
378	MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>");