blob: f6b57579185afbccf4b89b8a35b276f2dbbba12f [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}
Philipp Zabelcb1b5df2016-04-27 10:48:00 +020094EXPORT_SYMBOL_GPL(mtk_smi_larb_get);
Yong Wucc8bbe12016-02-23 01:20:49 +080095
96void mtk_smi_larb_put(struct device *larbdev)
97{
98 struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
99 struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
100
101 /*
102 * Don't de-configure the iommu info for this larb since there may be
103 * several modules in this larb.
104 * The iommu info will be reset after power off.
105 */
106
107 mtk_smi_disable(&larb->smi);
108 mtk_smi_disable(common);
109}
Philipp Zabelcb1b5df2016-04-27 10:48:00 +0200110EXPORT_SYMBOL_GPL(mtk_smi_larb_put);
Yong Wucc8bbe12016-02-23 01:20:49 +0800111
112static int
113mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
114{
115 struct mtk_smi_larb *larb = dev_get_drvdata(dev);
116 struct mtk_smi_iommu *smi_iommu = data;
117 unsigned int i;
118
119 for (i = 0; i < smi_iommu->larb_nr; i++) {
120 if (dev == smi_iommu->larb_imu[i].dev) {
121 /* The 'mmu' may be updated in iommu-attach/detach. */
122 larb->mmu = &smi_iommu->larb_imu[i].mmu;
123 return 0;
124 }
125 }
126 return -ENODEV;
127}
128
129static void
130mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
131{
132 /* Do nothing as the iommu is always enabled. */
133}
134
135static const struct component_ops mtk_smi_larb_component_ops = {
136 .bind = mtk_smi_larb_bind,
137 .unbind = mtk_smi_larb_unbind,
138};
139
140static int mtk_smi_larb_probe(struct platform_device *pdev)
141{
142 struct mtk_smi_larb *larb;
143 struct resource *res;
144 struct device *dev = &pdev->dev;
145 struct device_node *smi_node;
146 struct platform_device *smi_pdev;
147
148 if (!dev->pm_domain)
149 return -EPROBE_DEFER;
150
151 larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
152 if (!larb)
153 return -ENOMEM;
154
155 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156 larb->base = devm_ioremap_resource(dev, res);
157 if (IS_ERR(larb->base))
158 return PTR_ERR(larb->base);
159
160 larb->smi.clk_apb = devm_clk_get(dev, "apb");
161 if (IS_ERR(larb->smi.clk_apb))
162 return PTR_ERR(larb->smi.clk_apb);
163
164 larb->smi.clk_smi = devm_clk_get(dev, "smi");
165 if (IS_ERR(larb->smi.clk_smi))
166 return PTR_ERR(larb->smi.clk_smi);
167 larb->smi.dev = dev;
168
169 smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
170 if (!smi_node)
171 return -EINVAL;
172
173 smi_pdev = of_find_device_by_node(smi_node);
174 of_node_put(smi_node);
175 if (smi_pdev) {
176 larb->smi_common_dev = &smi_pdev->dev;
177 } else {
178 dev_err(dev, "Failed to get the smi_common device\n");
179 return -EINVAL;
180 }
181
182 pm_runtime_enable(dev);
183 platform_set_drvdata(pdev, larb);
184 return component_add(dev, &mtk_smi_larb_component_ops);
185}
186
187static int mtk_smi_larb_remove(struct platform_device *pdev)
188{
189 pm_runtime_disable(&pdev->dev);
190 component_del(&pdev->dev, &mtk_smi_larb_component_ops);
191 return 0;
192}
193
194static const struct of_device_id mtk_smi_larb_of_ids[] = {
195 { .compatible = "mediatek,mt8173-smi-larb",},
196 {}
197};
198
199static struct platform_driver mtk_smi_larb_driver = {
200 .probe = mtk_smi_larb_probe,
201 .remove = mtk_smi_larb_remove,
202 .driver = {
203 .name = "mtk-smi-larb",
204 .of_match_table = mtk_smi_larb_of_ids,
205 }
206};
207
208static int mtk_smi_common_probe(struct platform_device *pdev)
209{
210 struct device *dev = &pdev->dev;
211 struct mtk_smi *common;
212
213 if (!dev->pm_domain)
214 return -EPROBE_DEFER;
215
216 common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
217 if (!common)
218 return -ENOMEM;
219 common->dev = dev;
220
221 common->clk_apb = devm_clk_get(dev, "apb");
222 if (IS_ERR(common->clk_apb))
223 return PTR_ERR(common->clk_apb);
224
225 common->clk_smi = devm_clk_get(dev, "smi");
226 if (IS_ERR(common->clk_smi))
227 return PTR_ERR(common->clk_smi);
228
229 pm_runtime_enable(dev);
230 platform_set_drvdata(pdev, common);
231 return 0;
232}
233
234static int mtk_smi_common_remove(struct platform_device *pdev)
235{
236 pm_runtime_disable(&pdev->dev);
237 return 0;
238}
239
240static const struct of_device_id mtk_smi_common_of_ids[] = {
241 { .compatible = "mediatek,mt8173-smi-common", },
242 {}
243};
244
245static struct platform_driver mtk_smi_common_driver = {
246 .probe = mtk_smi_common_probe,
247 .remove = mtk_smi_common_remove,
248 .driver = {
249 .name = "mtk-smi-common",
250 .of_match_table = mtk_smi_common_of_ids,
251 }
252};
253
254static int __init mtk_smi_init(void)
255{
256 int ret;
257
258 ret = platform_driver_register(&mtk_smi_common_driver);
259 if (ret != 0) {
260 pr_err("Failed to register SMI driver\n");
261 return ret;
262 }
263
264 ret = platform_driver_register(&mtk_smi_larb_driver);
265 if (ret != 0) {
266 pr_err("Failed to register SMI-LARB driver\n");
267 goto err_unreg_smi;
268 }
269 return ret;
270
271err_unreg_smi:
272 platform_driver_unregister(&mtk_smi_common_driver);
273 return ret;
274}
275subsys_initcall(mtk_smi_init);