drivers/iommu/shmobile-ipmmu.c

   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
  38         mutex_lock(&ipmmu->flush_lock);
  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);
  43         mutex_unlock(&ipmmu->flush_lock);
  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
  52         mutex_lock(&ipmmu->flush_lock);
  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);
  88         mutex_unlock(&ipmmu->flush_lock);
  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
  97         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  98         if (!res) {
  99                 dev_err(&pdev->dev, "cannot get platform resources\n");
 100                 return -ENOENT;
 101         }
 102         ipmmu = devm_kzalloc(&pdev->dev, sizeof(*ipmmu), GFP_KERNEL);
 103         if (!ipmmu) {
 104                 dev_err(&pdev->dev, "cannot allocate device data\n");
 105                 return -ENOMEM;
 106         }
 107         mutex_init(&ipmmu->flush_lock);
 108         ipmmu->dev = &pdev->dev;
 109         ipmmu->ipmmu_base = devm_ioremap_nocache(&pdev->dev, res->start,
 110                                                 resource_size(res));
 111         if (!ipmmu->ipmmu_base) {
 112                 dev_err(&pdev->dev, "ioremap_nocache failed\n");
 113                 return -ENOMEM;
 114         }
 115         ipmmu->dev_names = pdata->dev_names;
 116         ipmmu->num_dev_names = pdata->num_dev_names;
 117         platform_set_drvdata(pdev, ipmmu);
 118         ipmmu_reg_write(ipmmu, IMCTR1, 0x0); /* disable TLB */
 119         ipmmu_reg_write(ipmmu, IMCTR2, 0x0); /* disable PMB */
 120         ipmmu_iommu_init(ipmmu);
 121         return 0;
 122 }
 123
 124 static struct platform_driver ipmmu_driver = {
 125         .probe = ipmmu_probe,
 126         .driver = {
 127                 .owner = THIS_MODULE,
 128                 .name = "ipmmu",
 129         },
 130 };
 131
 132 static int __init ipmmu_init(void)
 133 {
 134         return platform_driver_register(&ipmmu_driver);
 135 }
 136 subsys_initcall(ipmmu_init);