blob: 089091f5f89068ce9d179e6d9d36963592cccdc0 [file] [log] [blame]
Yong Wucc8bbe12016-02-23 01:20:49 +08001/*
2 * Copyright (c) 2015-2016 MediaTek Inc.
3 * Author: Yong Wu <yong.wu@mediatek.com>
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 version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14#include <linux/clk.h>
15#include <linux/component.h>
16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/io.h>
19#include <linux/of.h>
20#include <linux/of_platform.h>
21#include <linux/platform_device.h>
22#include <linux/pm_runtime.h>
23#include <soc/mediatek/smi.h>
24
25#define SMI_LARB_MMU_EN 0xf00
26
27struct mtk_smi {
28 struct device *dev;
29 struct clk *clk_apb, *clk_smi;
30};
31
32struct mtk_smi_larb { /* larb: local arbiter */
33 struct mtk_smi smi;
34 void __iomem *base;
35 struct device *smi_common_dev;
36 u32 *mmu;
37};
38
39static int mtk_smi_enable(const struct mtk_smi *smi)
40{
41 int ret;
42
43 ret = pm_runtime_get_sync(smi->dev);
44 if (ret < 0)
45 return ret;
46
47 ret = clk_prepare_enable(smi->clk_apb);
48 if (ret)
49 goto err_put_pm;
50
51 ret = clk_prepare_enable(smi->clk_smi);
52 if (ret)
53 goto err_disable_apb;
54
55 return 0;
56
57err_disable_apb:
58 clk_disable_unprepare(smi->clk_apb);
59err_put_pm:
60 pm_runtime_put_sync(smi->dev);
61 return ret;
62}
63
64static void mtk_smi_disable(const struct mtk_smi *smi)
65{
66 clk_disable_unprepare(smi->clk_smi);
67 clk_disable_unprepare(smi->clk_apb);
68 pm_runtime_put_sync(smi->dev);
69}
70
71int mtk_smi_larb_get(struct device *larbdev)
72{
73 struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
74 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
75 int ret;
76
77 /* Enable the smi-common's power and clocks */
78 ret = mtk_smi_enable(common);
79 if (ret)
80 return ret;
81
82 /* Enable the larb's power and clocks */
83 ret = mtk_smi_enable(&larb->smi);
84 if (ret) {
85 mtk_smi_disable(common);
86 return ret;
87 }
88
89 /* Configure the iommu info for this larb */
90 writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
91
92 return 0;
93}
94
95void mtk_smi_larb_put(struct device *larbdev)
96{
97 struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
98 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
99
100 /*
101 * Don't de-configure the iommu info for this larb since there may be
102 * several modules in this larb.
103 * The iommu info will be reset after power off.
104 */
105
106 mtk_smi_disable(&larb->smi);
107 mtk_smi_disable(common);
108}
109
110static int
111mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
112{
113 struct mtk_smi_larb *larb = dev_get_drvdata(dev);
114 struct mtk_smi_iommu *smi_iommu = data;
115 unsigned int i;
116
117 for (i = 0; i < smi_iommu->larb_nr; i++) {
118 if (dev == smi_iommu->larb_imu[i].dev) {
119 /* The 'mmu' may be updated in iommu-attach/detach. */
120 larb->mmu = &smi_iommu->larb_imu[i].mmu;
121 return 0;
122 }
123 }
124 return -ENODEV;
125}
126
127static void
128mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
129{
130 /* Do nothing as the iommu is always enabled. */
131}
132
133static const struct component_ops mtk_smi_larb_component_ops = {
134 .bind = mtk_smi_larb_bind,
135 .unbind = mtk_smi_larb_unbind,
136};
137
138static int mtk_smi_larb_probe(struct platform_device *pdev)
139{
140 struct mtk_smi_larb *larb;
141 struct resource *res;
142 struct device *dev = &pdev->dev;
143 struct device_node *smi_node;
144 struct platform_device *smi_pdev;
145
146 if (!dev->pm_domain)
147 return -EPROBE_DEFER;
148
149 larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
150 if (!larb)
151 return -ENOMEM;
152
153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
154 larb->base = devm_ioremap_resource(dev, res);
155 if (IS_ERR(larb->base))
156 return PTR_ERR(larb->base);
157
158 larb->smi.clk_apb = devm_clk_get(dev, "apb");
159 if (IS_ERR(larb->smi.clk_apb))
160 return PTR_ERR(larb->smi.clk_apb);
161
162 larb->smi.clk_smi = devm_clk_get(dev, "smi");
163 if (IS_ERR(larb->smi.clk_smi))
164 return PTR_ERR(larb->smi.clk_smi);
165 larb->smi.dev = dev;
166
167 smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
168 if (!smi_node)
169 return -EINVAL;
170
171 smi_pdev = of_find_device_by_node(smi_node);
172 of_node_put(smi_node);
173 if (smi_pdev) {
174 larb->smi_common_dev = &smi_pdev->dev;
175 } else {
176 dev_err(dev, "Failed to get the smi_common device\n");
177 return -EINVAL;
178 }
179
180 pm_runtime_enable(dev);
181 platform_set_drvdata(pdev, larb);
182 return component_add(dev, &mtk_smi_larb_component_ops);
183}
184
185static int mtk_smi_larb_remove(struct platform_device *pdev)
186{
187 pm_runtime_disable(&pdev->dev);
188 component_del(&pdev->dev, &mtk_smi_larb_component_ops);
189 return 0;
190}
191
192static const struct of_device_id mtk_smi_larb_of_ids[] = {
193 { .compatible = "mediatek,mt8173-smi-larb",},
194 {}
195};
196
197static struct platform_driver mtk_smi_larb_driver = {
198 .probe = mtk_smi_larb_probe,
199 .remove = mtk_smi_larb_remove,
200 .driver = {
201 .name = "mtk-smi-larb",
202 .of_match_table = mtk_smi_larb_of_ids,
203 }
204};
205
206static int mtk_smi_common_probe(struct platform_device *pdev)
207{
208 struct device *dev = &pdev->dev;
209 struct mtk_smi *common;
210
211 if (!dev->pm_domain)
212 return -EPROBE_DEFER;
213
214 common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
215 if (!common)
216 return -ENOMEM;
217 common->dev = dev;
218
219 common->clk_apb = devm_clk_get(dev, "apb");
220 if (IS_ERR(common->clk_apb))
221 return PTR_ERR(common->clk_apb);
222
223 common->clk_smi = devm_clk_get(dev, "smi");
224 if (IS_ERR(common->clk_smi))
225 return PTR_ERR(common->clk_smi);
226
227 pm_runtime_enable(dev);
228 platform_set_drvdata(pdev, common);
229 return 0;
230}
231
232static int mtk_smi_common_remove(struct platform_device *pdev)
233{
234 pm_runtime_disable(&pdev->dev);
235 return 0;
236}
237
238static const struct of_device_id mtk_smi_common_of_ids[] = {
239 { .compatible = "mediatek,mt8173-smi-common", },
240 {}
241};
242
243static struct platform_driver mtk_smi_common_driver = {
244 .probe = mtk_smi_common_probe,
245 .remove = mtk_smi_common_remove,
246 .driver = {
247 .name = "mtk-smi-common",
248 .of_match_table = mtk_smi_common_of_ids,
249 }
250};
251
252static int __init mtk_smi_init(void)
253{
254 int ret;
255
256 ret = platform_driver_register(&mtk_smi_common_driver);
257 if (ret != 0) {
258 pr_err("Failed to register SMI driver\n");
259 return ret;
260 }
261
262 ret = platform_driver_register(&mtk_smi_larb_driver);
263 if (ret != 0) {
264 pr_err("Failed to register SMI-LARB driver\n");
265 goto err_unreg_smi;
266 }
267 return ret;
268
269err_unreg_smi:
270 platform_driver_unregister(&mtk_smi_common_driver);
271 return ret;
272}
273subsys_initcall(mtk_smi_init);