/*
* 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;
mutex_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);
mutex_unlock(&ipmmu->flush_lock);
}
void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
int asid)
{
if (!ipmmu)
return;
mutex_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);
mutex_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;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "cannot get platform resources\n");
return -ENOENT;
}
ipmmu = devm_kzalloc(&pdev->dev, sizeof(*ipmmu), GFP_KERNEL);
if (!ipmmu) {
dev_err(&pdev->dev, "cannot allocate device data\n");
return -ENOMEM;
}
mutex_init(&ipmmu->flush_lock);
ipmmu->dev = &pdev->dev;
ipmmu->ipmmu_base = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (!ipmmu->ipmmu_base) {
dev_err(&pdev->dev, "ioremap_nocache failed\n");
return -ENOMEM;
}
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 */
ipmmu_iommu_init(ipmmu);
return 0;
}
static struct platform_driver ipmmu_driver = {
.probe = ipmmu_probe,
.driver = {
.owner = THIS_MODULE,
.name = "ipmmu",
},
};
static int __init ipmmu_init(void)
{
return platform_driver_register(&ipmmu_driver);
}
subsys_initcall(ipmmu_init);
