e87c621dce
The lock is taken in atomic context, replace it with a spinlock. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* IPMMU/IPMMUI
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* Copyright (C) 2012 Hideki EIRAKU
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/platform_data/sh_ipmmu.h>
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#include "shmobile-ipmmu.h"
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#define IMCTR1 0x000
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#define IMCTR2 0x004
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#define IMASID 0x010
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#define IMTTBR 0x014
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#define IMTTBCR 0x018
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#define IMCTR1_TLBEN (1 << 0)
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#define IMCTR1_FLUSH (1 << 1)
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static void ipmmu_reg_write(struct shmobile_ipmmu *ipmmu, unsigned long reg_off,
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unsigned long data)
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{
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iowrite32(data, ipmmu->ipmmu_base + reg_off);
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}
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void ipmmu_tlb_flush(struct shmobile_ipmmu *ipmmu)
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{
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if (!ipmmu)
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return;
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spin_lock(&ipmmu->flush_lock);
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if (ipmmu->tlb_enabled)
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ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH | IMCTR1_TLBEN);
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else
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ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH);
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spin_unlock(&ipmmu->flush_lock);
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}
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void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
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int asid)
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{
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if (!ipmmu)
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return;
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spin_lock(&ipmmu->flush_lock);
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switch (size) {
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default:
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ipmmu->tlb_enabled = 0;
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break;
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case 0x2000:
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ipmmu_reg_write(ipmmu, IMTTBCR, 1);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x1000:
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ipmmu_reg_write(ipmmu, IMTTBCR, 2);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x800:
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ipmmu_reg_write(ipmmu, IMTTBCR, 3);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x400:
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ipmmu_reg_write(ipmmu, IMTTBCR, 4);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x200:
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ipmmu_reg_write(ipmmu, IMTTBCR, 5);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x100:
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ipmmu_reg_write(ipmmu, IMTTBCR, 6);
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ipmmu->tlb_enabled = 1;
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break;
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case 0x80:
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ipmmu_reg_write(ipmmu, IMTTBCR, 7);
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ipmmu->tlb_enabled = 1;
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break;
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}
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ipmmu_reg_write(ipmmu, IMTTBR, phys);
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ipmmu_reg_write(ipmmu, IMASID, asid);
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spin_unlock(&ipmmu->flush_lock);
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}
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static int ipmmu_probe(struct platform_device *pdev)
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{
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struct shmobile_ipmmu *ipmmu;
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struct resource *res;
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struct shmobile_ipmmu_platform_data *pdata = pdev->dev.platform_data;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "cannot get platform resources\n");
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return -ENOENT;
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}
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ipmmu = devm_kzalloc(&pdev->dev, sizeof(*ipmmu), GFP_KERNEL);
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if (!ipmmu) {
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dev_err(&pdev->dev, "cannot allocate device data\n");
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return -ENOMEM;
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}
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spin_lock_init(&ipmmu->flush_lock);
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ipmmu->dev = &pdev->dev;
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ipmmu->ipmmu_base = devm_ioremap_nocache(&pdev->dev, res->start,
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resource_size(res));
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if (!ipmmu->ipmmu_base) {
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dev_err(&pdev->dev, "ioremap_nocache failed\n");
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return -ENOMEM;
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}
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ipmmu->dev_names = pdata->dev_names;
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ipmmu->num_dev_names = pdata->num_dev_names;
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platform_set_drvdata(pdev, ipmmu);
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ipmmu_reg_write(ipmmu, IMCTR1, 0x0); /* disable TLB */
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ipmmu_reg_write(ipmmu, IMCTR2, 0x0); /* disable PMB */
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ipmmu_iommu_init(ipmmu);
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return 0;
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}
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static struct platform_driver ipmmu_driver = {
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.probe = ipmmu_probe,
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.driver = {
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.owner = THIS_MODULE,
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.name = "ipmmu",
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},
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};
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static int __init ipmmu_init(void)
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{
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return platform_driver_register(&ipmmu_driver);
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}
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subsys_initcall(ipmmu_init);
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