Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / iommu / shmobile-ipmmu.c

diff --git a/kernel/drivers/iommu/shmobile-ipmmu.c b/kernel/drivers/iommu/shmobile-ipmmu.c
new file mode 100644 (file)
index 0000000..951651a
--- /dev/null
+++ b/kernel/drivers/iommu/shmobile-ipmmu.c
@@ -0,0 +1,129 @@
+/*
+ * 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);