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
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
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
46void 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
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
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
118static struct platform_driver ipmmu_driver = {
119	.probe = ipmmu_probe,
120	.driver = {
121		.name = "ipmmu",
122	},
123};
124
125static int __init ipmmu_init(void)
126{
127	return platform_driver_register(&ipmmu_driver);
128}
129subsys_initcall(ipmmu_init);
130