Merge tag 'staging-4.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[sfrench/cifs-2.6.git] / 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                 .name = "ipmmu",
122         },
123 };
124
125 static int __init ipmmu_init(void)
126 {
127         return platform_driver_register(&ipmmu_driver);
128 }
129 subsys_initcall(ipmmu_init);