blob: 951651a9746b9d8d9bdf02bcf3a0b879fc63ed2d [file] [log] [blame]
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +09001/*
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
27static 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
33void ipmmu_tlb_flush(struct shmobile_ipmmu *ipmmu)
34{
35 if (!ipmmu)
36 return;
37
Laurent Pincharte87c6212013-12-17 18:18:50 +010038 spin_lock(&ipmmu->flush_lock);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +090039 if (ipmmu->tlb_enabled)
40 ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH | IMCTR1_TLBEN);
41 else
42 ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH);
Laurent Pincharte87c6212013-12-17 18:18:50 +010043 spin_unlock(&ipmmu->flush_lock);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +090044}
45
46void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
47 int asid)
48{
49 if (!ipmmu)
50 return;
51
Laurent Pincharte87c6212013-12-17 18:18:50 +010052 spin_lock(&ipmmu->flush_lock);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +090053 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);
Laurent Pincharte87c6212013-12-17 18:18:50 +010088 spin_unlock(&ipmmu->flush_lock);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +090089}
90
91static 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
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +090097 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 }
Laurent Pincharte87c6212013-12-17 18:18:50 +0100102 spin_lock_init(&ipmmu->flush_lock);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +0900103 ipmmu->dev = &pdev->dev;
Laurent Pinchartb11762f2014-02-21 16:54:53 +0100104
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
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +0900110 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 */
Laurent Pinchartac1ef1f2014-02-21 16:54:53 +0100115 return ipmmu_iommu_init(ipmmu);
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +0900116}
117
118static struct platform_driver ipmmu_driver = {
119 .probe = ipmmu_probe,
120 .driver = {
Hideki EIRAKUc2c460f2013-01-21 19:54:26 +0900121 .name = "ipmmu",
122 },
123};
124
125static int __init ipmmu_init(void)
126{
127 return platform_driver_register(&ipmmu_driver);
128}
129subsys_initcall(ipmmu_init);