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
ipmmu_reg_write(struct shmobile_ipmmu * ipmmu,unsigned long reg_off,unsigned long data)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
ipmmu_tlb_flush(struct shmobile_ipmmu * ipmmu)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
ipmmu_tlb_set(struct shmobile_ipmmu * ipmmu,unsigned long phys,int size,int asid)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
ipmmu_probe(struct platform_device * pdev)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
ipmmu_init(void)125 static int __init ipmmu_init(void)
126 {
127 return platform_driver_register(&ipmmu_driver);
128 }
129 subsys_initcall(ipmmu_init);
130