[linux-2.6-block.git] / drivers / memory / mtk-smi.c

/*
 * Copyright (c) 2015-2016 MediaTek Inc.
 * Author: Yong Wu <yong.wu@mediatek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <soc/mediatek/smi.h>

#define SMI_LARB_MMU_EN		0xf00

struct mtk_smi {
	struct device	*dev;
	struct clk	*clk_apb, *clk_smi;
};

struct mtk_smi_larb { /* larb: local arbiter */
	struct mtk_smi  smi;
	void __iomem	*base;
	struct device	*smi_common_dev;
	u32		*mmu;
};

static int mtk_smi_enable(const struct mtk_smi *smi)
{
	int ret;

	ret = pm_runtime_get_sync(smi->dev);
	if (ret < 0)
		return ret;

	ret = clk_prepare_enable(smi->clk_apb);
	if (ret)
		goto err_put_pm;

	ret = clk_prepare_enable(smi->clk_smi);
	if (ret)
		goto err_disable_apb;

	return 0;

err_disable_apb:
	clk_disable_unprepare(smi->clk_apb);
err_put_pm:
	pm_runtime_put_sync(smi->dev);
	return ret;
}

static void mtk_smi_disable(const struct mtk_smi *smi)
{
	clk_disable_unprepare(smi->clk_smi);
	clk_disable_unprepare(smi->clk_apb);
	pm_runtime_put_sync(smi->dev);
}

int mtk_smi_larb_get(struct device *larbdev)
{
	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
	int ret;

	/* Enable the smi-common's power and clocks */
	ret = mtk_smi_enable(common);
	if (ret)
		return ret;

	/* Enable the larb's power and clocks */
	ret = mtk_smi_enable(&larb->smi);
	if (ret) {
		mtk_smi_disable(common);
		return ret;
	}

	/* Configure the iommu info for this larb */
	writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);

	return 0;
}

void mtk_smi_larb_put(struct device *larbdev)
{
	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);

	/*
	 * Don't de-configure the iommu info for this larb since there may be
	 * several modules in this larb.
	 * The iommu info will be reset after power off.
	 */

	mtk_smi_disable(&larb->smi);
	mtk_smi_disable(common);
}

static int
mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
{
	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
	struct mtk_smi_iommu *smi_iommu = data;
	unsigned int         i;

	for (i = 0; i < smi_iommu->larb_nr; i++) {
		if (dev == smi_iommu->larb_imu[i].dev) {
			/* The 'mmu' may be updated in iommu-attach/detach. */
			larb->mmu = &smi_iommu->larb_imu[i].mmu;
			return 0;
		}
	}
	return -ENODEV;
}

static void
mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
{
	/* Do nothing as the iommu is always enabled. */
}

static const struct component_ops mtk_smi_larb_component_ops = {
	.bind = mtk_smi_larb_bind,
	.unbind = mtk_smi_larb_unbind,
};

static int mtk_smi_larb_probe(struct platform_device *pdev)
{
	struct mtk_smi_larb *larb;
	struct resource *res;
	struct device *dev = &pdev->dev;
	struct device_node *smi_node;
	struct platform_device *smi_pdev;

	if (!dev->pm_domain)
		return -EPROBE_DEFER;

	larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
	if (!larb)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	larb->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(larb->base))
		return PTR_ERR(larb->base);

	larb->smi.clk_apb = devm_clk_get(dev, "apb");
	if (IS_ERR(larb->smi.clk_apb))
		return PTR_ERR(larb->smi.clk_apb);

	larb->smi.clk_smi = devm_clk_get(dev, "smi");
	if (IS_ERR(larb->smi.clk_smi))
		return PTR_ERR(larb->smi.clk_smi);
	larb->smi.dev = dev;

	smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
	if (!smi_node)
		return -EINVAL;

	smi_pdev = of_find_device_by_node(smi_node);
	of_node_put(smi_node);
	if (smi_pdev) {
		larb->smi_common_dev = &smi_pdev->dev;
	} else {
		dev_err(dev, "Failed to get the smi_common device\n");
		return -EINVAL;
	}

	pm_runtime_enable(dev);
	platform_set_drvdata(pdev, larb);
	return component_add(dev, &mtk_smi_larb_component_ops);
}

static int mtk_smi_larb_remove(struct platform_device *pdev)
{
	pm_runtime_disable(&pdev->dev);
	component_del(&pdev->dev, &mtk_smi_larb_component_ops);
	return 0;
}

static const struct of_device_id mtk_smi_larb_of_ids[] = {
	{ .compatible = "mediatek,mt8173-smi-larb",},
	{}
};

static struct platform_driver mtk_smi_larb_driver = {
	.probe	= mtk_smi_larb_probe,
	.remove = mtk_smi_larb_remove,
	.driver	= {
		.name = "mtk-smi-larb",
		.of_match_table = mtk_smi_larb_of_ids,
	}
};

static int mtk_smi_common_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mtk_smi *common;

	if (!dev->pm_domain)
		return -EPROBE_DEFER;

	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
	if (!common)
		return -ENOMEM;
	common->dev = dev;

	common->clk_apb = devm_clk_get(dev, "apb");
	if (IS_ERR(common->clk_apb))
		return PTR_ERR(common->clk_apb);

	common->clk_smi = devm_clk_get(dev, "smi");
	if (IS_ERR(common->clk_smi))
		return PTR_ERR(common->clk_smi);

	pm_runtime_enable(dev);
	platform_set_drvdata(pdev, common);
	return 0;
}

static int mtk_smi_common_remove(struct platform_device *pdev)
{
	pm_runtime_disable(&pdev->dev);
	return 0;
}

static const struct of_device_id mtk_smi_common_of_ids[] = {
	{ .compatible = "mediatek,mt8173-smi-common", },
	{}
};

static struct platform_driver mtk_smi_common_driver = {
	.probe	= mtk_smi_common_probe,
	.remove = mtk_smi_common_remove,
	.driver	= {
		.name = "mtk-smi-common",
		.of_match_table = mtk_smi_common_of_ids,
	}
};

static int __init mtk_smi_init(void)
{
	int ret;

	ret = platform_driver_register(&mtk_smi_common_driver);
	if (ret != 0) {
		pr_err("Failed to register SMI driver\n");
		return ret;
	}

	ret = platform_driver_register(&mtk_smi_larb_driver);
	if (ret != 0) {
		pr_err("Failed to register SMI-LARB driver\n");
		goto err_unreg_smi;
	}
	return ret;

err_unreg_smi:
	platform_driver_unregister(&mtk_smi_common_driver);
	return ret;
}
subsys_initcall(mtk_smi_init);
Commit	Line	Data
cc8bbe1a YW	1	/*
	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
	27	struct mtk_smi {
	28	struct device *dev;
	29	struct clk clk_apb, clk_smi;
	30	};
	31
	32	struct 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
	39	static 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
	57	err_disable_apb:
	58	clk_disable_unprepare(smi->clk_apb);
	59	err_put_pm:
	60	pm_runtime_put_sync(smi->dev);
	61	return ret;
	62	}
	63
	64	static 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
71	int 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
95	void 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
110	static int
111	mtk_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
127	static void
128	mtk_smi_larb_unbind(struct device dev, struct device master, void *data)
129	{
130	/* Do nothing as the iommu is always enabled. */
131	}
132
133	static const struct component_ops mtk_smi_larb_component_ops = {
134	.bind = mtk_smi_larb_bind,
135	.unbind = mtk_smi_larb_unbind,
136	};
137
138	static 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
185	static 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
192	static const struct of_device_id mtk_smi_larb_of_ids[] = {
193	{ .compatible = "mediatek,mt8173-smi-larb",},
194	{}
195	};
196
197	static 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
206	static 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
232	static int mtk_smi_common_remove(struct platform_device *pdev)
233	{
234	pm_runtime_disable(&pdev->dev);
235	return 0;
236	}
237
238	static const struct of_device_id mtk_smi_common_of_ids[] = {
239	{ .compatible = "mediatek,mt8173-smi-common", },
240	{}
241	};
242
243	static 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
252	static 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
269	err_unreg_smi:
270	platform_driver_unregister(&mtk_smi_common_driver);
271	return ret;
272	}
273	subsys_initcall(mtk_smi_init);