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Linux/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         spin_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         spin_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         spin_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         spin_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         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         }
102         spin_lock_init(&ipmmu->flush_lock);
103         ipmmu->dev = &pdev->dev;
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 
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 */
115         return ipmmu_iommu_init(ipmmu);
116 }
117 
118 static struct platform_driver ipmmu_driver = {
119         .probe = ipmmu_probe,
120         .driver = {
121                 .owner = THIS_MODULE,
122                 .name = "ipmmu",
123         },
124 };
125 
126 static int __init ipmmu_init(void)
127 {
128         return platform_driver_register(&ipmmu_driver);
129 }
130 subsys_initcall(ipmmu_init);
131 

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