[linux.git] / drivers / iommu / shmobile-ipmmu.c

/*
 * IPMMU/IPMMUI
 * Copyright (C) 2012  Hideki EIRAKU
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */

#include <linux/err.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/platform_data/sh_ipmmu.h>
#include "shmobile-ipmmu.h"

#define IMCTR1 0x000
#define IMCTR2 0x004
#define IMASID 0x010
#define IMTTBR 0x014
#define IMTTBCR 0x018

#define IMCTR1_TLBEN (1 << 0)
#define IMCTR1_FLUSH (1 << 1)

static void ipmmu_reg_write(struct shmobile_ipmmu *ipmmu, unsigned long reg_off,
			    unsigned long data)
{
	iowrite32(data, ipmmu->ipmmu_base + reg_off);
}

void ipmmu_tlb_flush(struct shmobile_ipmmu *ipmmu)
{
	if (!ipmmu)
		return;

	spin_lock(&ipmmu->flush_lock);
	if (ipmmu->tlb_enabled)
		ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH | IMCTR1_TLBEN);
	else
		ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH);
	spin_unlock(&ipmmu->flush_lock);
}

void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
		   int asid)
{
	if (!ipmmu)
		return;

	spin_lock(&ipmmu->flush_lock);
	switch (size) {
	default:
		ipmmu->tlb_enabled = 0;
		break;
	case 0x2000:
		ipmmu_reg_write(ipmmu, IMTTBCR, 1);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x1000:
		ipmmu_reg_write(ipmmu, IMTTBCR, 2);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x800:
		ipmmu_reg_write(ipmmu, IMTTBCR, 3);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x400:
		ipmmu_reg_write(ipmmu, IMTTBCR, 4);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x200:
		ipmmu_reg_write(ipmmu, IMTTBCR, 5);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x100:
		ipmmu_reg_write(ipmmu, IMTTBCR, 6);
		ipmmu->tlb_enabled = 1;
		break;
	case 0x80:
		ipmmu_reg_write(ipmmu, IMTTBCR, 7);
		ipmmu->tlb_enabled = 1;
		break;
	}
	ipmmu_reg_write(ipmmu, IMTTBR, phys);
	ipmmu_reg_write(ipmmu, IMASID, asid);
	spin_unlock(&ipmmu->flush_lock);
}

static int ipmmu_probe(struct platform_device *pdev)
{
	struct shmobile_ipmmu *ipmmu;
	struct resource *res;
	struct shmobile_ipmmu_platform_data *pdata = pdev->dev.platform_data;

	ipmmu = devm_kzalloc(&pdev->dev, sizeof(*ipmmu), GFP_KERNEL);
	if (!ipmmu) {
		dev_err(&pdev->dev, "cannot allocate device data\n");
		return -ENOMEM;
	}
	spin_lock_init(&ipmmu->flush_lock);
	ipmmu->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ipmmu->ipmmu_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ipmmu->ipmmu_base))
		return PTR_ERR(ipmmu->ipmmu_base);

	ipmmu->dev_names = pdata->dev_names;
	ipmmu->num_dev_names = pdata->num_dev_names;
	platform_set_drvdata(pdev, ipmmu);
	ipmmu_reg_write(ipmmu, IMCTR1, 0x0); /* disable TLB */
	ipmmu_reg_write(ipmmu, IMCTR2, 0x0); /* disable PMB */
	return ipmmu_iommu_init(ipmmu);
}

static struct platform_driver ipmmu_driver = {
	.probe = ipmmu_probe,
	.driver = {
		.name = "ipmmu",
	},
};

static int __init ipmmu_init(void)
{
	return platform_driver_register(&ipmmu_driver);
}
subsys_initcall(ipmmu_init);
Commit	Line	Data
c2c460f7 HE	1	/*
	2	* IPMMU/IPMMUI
	3	* Copyright (C) 2012 Hideki EIRAKU
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; version 2 of the License.
	8	*/
	9
	10	#include <linux/err.h>
	11	#include <linux/export.h>
	12	#include <linux/io.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/slab.h>
	15	#include <linux/platform_data/sh_ipmmu.h>
	16	#include "shmobile-ipmmu.h"
	17
	18	#define IMCTR1 0x000
	19	#define IMCTR2 0x004
	20	#define IMASID 0x010
	21	#define IMTTBR 0x014
	22	#define IMTTBCR 0x018
	23
	24	#define IMCTR1_TLBEN (1 << 0)
	25	#define IMCTR1_FLUSH (1 << 1)
	26
	27	static void ipmmu_reg_write(struct shmobile_ipmmu *ipmmu, unsigned long reg_off,
	28	unsigned long data)
	29	{
	30	iowrite32(data, ipmmu->ipmmu_base + reg_off);
	31	}
	32
	33	void ipmmu_tlb_flush(struct shmobile_ipmmu *ipmmu)
	34	{
	35	if (!ipmmu)
	36	return;
	37
e87c621d	38	spin_lock(&ipmmu->flush_lock);
c2c460f7 HE	39	if (ipmmu->tlb_enabled)
	40	ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH \| IMCTR1_TLBEN);
	41	else
	42	ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH);
e87c621d	43	spin_unlock(&ipmmu->flush_lock);
c2c460f7 HE	44	}
	45
	46	void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
	47	int asid)
	48	{
	49	if (!ipmmu)
	50	return;
	51
e87c621d	52	spin_lock(&ipmmu->flush_lock);
c2c460f7 HE	53	switch (size) {
	54	default:
	55	ipmmu->tlb_enabled = 0;
	56	break;
	57	case 0x2000:
	58	ipmmu_reg_write(ipmmu, IMTTBCR, 1);
	59	ipmmu->tlb_enabled = 1;
	60	break;
	61	case 0x1000:
	62	ipmmu_reg_write(ipmmu, IMTTBCR, 2);
	63	ipmmu->tlb_enabled = 1;
	64	break;
	65	case 0x800:
	66	ipmmu_reg_write(ipmmu, IMTTBCR, 3);
	67	ipmmu->tlb_enabled = 1;
	68	break;
	69	case 0x400:
	70	ipmmu_reg_write(ipmmu, IMTTBCR, 4);
	71	ipmmu->tlb_enabled = 1;
	72	break;
	73	case 0x200:
	74	ipmmu_reg_write(ipmmu, IMTTBCR, 5);
	75	ipmmu->tlb_enabled = 1;
	76	break;
	77	case 0x100:
	78	ipmmu_reg_write(ipmmu, IMTTBCR, 6);
	79	ipmmu->tlb_enabled = 1;
	80	break;
	81	case 0x80:
	82	ipmmu_reg_write(ipmmu, IMTTBCR, 7);
	83	ipmmu->tlb_enabled = 1;
	84	break;
	85	}
	86	ipmmu_reg_write(ipmmu, IMTTBR, phys);
	87	ipmmu_reg_write(ipmmu, IMASID, asid);
e87c621d	88	spin_unlock(&ipmmu->flush_lock);
c2c460f7 HE	89	}
	90
	91	static int ipmmu_probe(struct platform_device *pdev)
	92	{
	93	struct shmobile_ipmmu *ipmmu;
	94	struct resource *res;
	95	struct shmobile_ipmmu_platform_data *pdata = pdev->dev.platform_data;
	96
c2c460f7 HE	97	ipmmu = devm_kzalloc(&pdev->dev, sizeof(*ipmmu), GFP_KERNEL);
	98	if (!ipmmu) {
	99	dev_err(&pdev->dev, "cannot allocate device data\n");
	100	return -ENOMEM;
	101	}
e87c621d	102	spin_lock_init(&ipmmu->flush_lock);
c2c460f7	103	ipmmu->dev = &pdev->dev;
b11762f8 LP	104
	105	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	106	ipmmu->ipmmu_base = devm_ioremap_resource(&pdev->dev, res);
	107	if (IS_ERR(ipmmu->ipmmu_base))
	108	return PTR_ERR(ipmmu->ipmmu_base);
	109
c2c460f7 HE	110	ipmmu->dev_names = pdata->dev_names;
	111	ipmmu->num_dev_names = pdata->num_dev_names;
	112	platform_set_drvdata(pdev, ipmmu);
	113	ipmmu_reg_write(ipmmu, IMCTR1, 0x0); /* disable TLB */
	114	ipmmu_reg_write(ipmmu, IMCTR2, 0x0); /* disable PMB */
ac1ef1fe	115	return ipmmu_iommu_init(ipmmu);
c2c460f7 HE	116	}
	117
	118	static struct platform_driver ipmmu_driver = {
	119	.probe = ipmmu_probe,
	120	.driver = {
c2c460f7 HE	121	.name = "ipmmu",
	122	},
	123	};
	124
	125	static int __init ipmmu_init(void)
	126	{
	127	return platform_driver_register(&ipmmu_driver);
	128	}
	129	subsys_initcall(ipmmu_init);